drivers/net/vxlan/vxlan_core.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * VXLAN: Virtual eXtensible Local Area Network
   4  *
   5  * Copyright (c) 2012-2013 Vyatta Inc.
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/errno.h>
  13 #include <linux/slab.h>
  14 #include <linux/udp.h>
  15 #include <linux/igmp.h>
  16 #include <linux/if_ether.h>
  17 #include <linux/ethtool.h>
  18 #include <net/arp.h>
  19 #include <net/ndisc.h>
  20 #include <net/gro.h>
  21 #include <net/ipv6_stubs.h>
  22 #include <net/ip.h>
  23 #include <net/icmp.h>
  24 #include <net/rtnetlink.h>
  25 #include <net/inet_ecn.h>
  26 #include <net/net_namespace.h>
  27 #include <net/netns/generic.h>
  28 #include <net/tun_proto.h>
  29 #include <net/vxlan.h>
  30 #include <net/nexthop.h>
  31
  32 #if IS_ENABLED(CONFIG_IPV6)
  33 #include <net/ip6_tunnel.h>
  34 #include <net/ip6_checksum.h>
  35 #endif
  36
  37 #include "vxlan_private.h"
  38
  39 #define VXLAN_VERSION   "0.1"
  40
  41 #define FDB_AGE_DEFAULT 300 /* 5 min */
  42 #define FDB_AGE_INTERVAL (10 * HZ)      /* rescan interval */
  43
  44 /* UDP port for VXLAN traffic.
  45  * The IANA assigned port is 4789, but the Linux default is 8472
  46  * for compatibility with early adopters.
  47  */
  48 static unsigned short vxlan_port __read_mostly = 8472;
  49 module_param_named(udp_port, vxlan_port, ushort, 0444);
  50 MODULE_PARM_DESC(udp_port, "Destination UDP port");
  51
  52 static bool log_ecn_error = true;
  53 module_param(log_ecn_error, bool, 0644);
  54 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  55
  56 unsigned int vxlan_net_id;
  57
  58 const u8 all_zeros_mac[ETH_ALEN + 2];
  59 static struct rtnl_link_ops vxlan_link_ops;
  60
  61 static int vxlan_sock_add(struct vxlan_dev *vxlan);
  62
  63 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
  64
  65 /* salt for hash table */
  66 static u32 vxlan_salt __read_mostly;
  67
  68 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
  69 {
  70         return vs->flags & VXLAN_F_COLLECT_METADATA ||
  71                ip_tunnel_collect_metadata();
  72 }
  73
  74 /* Find VXLAN socket based on network namespace, address family, UDP port,
  75  * enabled unshareable flags and socket device binding (see l3mdev with
  76  * non-default VRF).
  77  */
  78 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
  79                                           __be16 port, u32 flags, int ifindex)
  80 {
  81         struct vxlan_sock *vs;
  82
  83         flags &= VXLAN_F_RCV_FLAGS;
  84
  85         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
  86                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
  87                     vxlan_get_sk_family(vs) == family &&
  88                     vs->flags == flags &&
  89                     vs->sock->sk->sk_bound_dev_if == ifindex)
  90                         return vs;
  91         }
  92         return NULL;
  93 }
  94
  95 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs,
  96                                            int ifindex, __be32 vni,
  97                                            struct vxlan_vni_node **vninode)
  98 {
  99         struct vxlan_vni_node *vnode;
 100         struct vxlan_dev_node *node;
 101
 102         /* For flow based devices, map all packets to VNI 0 */
 103         if (vs->flags & VXLAN_F_COLLECT_METADATA &&
 104             !(vs->flags & VXLAN_F_VNIFILTER))
 105                 vni = 0;
 106
 107         hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
 108                 if (!node->vxlan)
 109                         continue;
 110                 vnode = NULL;
 111                 if (node->vxlan->cfg.flags & VXLAN_F_VNIFILTER) {
 112                         vnode = vxlan_vnifilter_lookup(node->vxlan, vni);
 113                         if (!vnode)
 114                                 continue;
 115                 } else if (node->vxlan->default_dst.remote_vni != vni) {
 116                         continue;
 117                 }
 118
 119                 if (IS_ENABLED(CONFIG_IPV6)) {
 120                         const struct vxlan_config *cfg = &node->vxlan->cfg;
 121
 122                         if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
 123                             cfg->remote_ifindex != ifindex)
 124                                 continue;
 125                 }
 126
 127                 if (vninode)
 128                         *vninode = vnode;
 129                 return node->vxlan;
 130         }
 131
 132         return NULL;
 133 }
 134
 135 /* Look up VNI in a per net namespace table */
 136 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
 137                                         __be32 vni, sa_family_t family,
 138                                         __be16 port, u32 flags)
 139 {
 140         struct vxlan_sock *vs;
 141
 142         vs = vxlan_find_sock(net, family, port, flags, ifindex);
 143         if (!vs)
 144                 return NULL;
 145
 146         return vxlan_vs_find_vni(vs, ifindex, vni, NULL);
 147 }
 148
 149 /* Fill in neighbour message in skbuff. */
 150 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 151                           const struct vxlan_fdb *fdb,
 152                           u32 portid, u32 seq, int type, unsigned int flags,
 153                           const struct vxlan_rdst *rdst)
 154 {
 155         unsigned long now = jiffies;
 156         struct nda_cacheinfo ci;
 157         bool send_ip, send_eth;
 158         struct nlmsghdr *nlh;
 159         struct nexthop *nh;
 160         struct ndmsg *ndm;
 161         int nh_family;
 162         u32 nh_id;
 163
 164         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 165         if (nlh == NULL)
 166                 return -EMSGSIZE;
 167
 168         ndm = nlmsg_data(nlh);
 169         memset(ndm, 0, sizeof(*ndm));
 170
 171         send_eth = send_ip = true;
 172
 173         rcu_read_lock();
 174         nh = rcu_dereference(fdb->nh);
 175         if (nh) {
 176                 nh_family = nexthop_get_family(nh);
 177                 nh_id = nh->id;
 178         }
 179         rcu_read_unlock();
 180
 181         if (type == RTM_GETNEIGH) {
 182                 if (rdst) {
 183                         send_ip = !vxlan_addr_any(&rdst->remote_ip);
 184                         ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
 185                 } else if (nh) {
 186                         ndm->ndm_family = nh_family;
 187                 }
 188                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
 189         } else
 190                 ndm->ndm_family = AF_BRIDGE;
 191         ndm->ndm_state = fdb->state;
 192         ndm->ndm_ifindex = vxlan->dev->ifindex;
 193         ndm->ndm_flags = fdb->flags;
 194         if (rdst && rdst->offloaded)
 195                 ndm->ndm_flags |= NTF_OFFLOADED;
 196         ndm->ndm_type = RTN_UNICAST;
 197
 198         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
 199             nla_put_s32(skb, NDA_LINK_NETNSID,
 200                         peernet2id(dev_net(vxlan->dev), vxlan->net)))
 201                 goto nla_put_failure;
 202
 203         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 204                 goto nla_put_failure;
 205         if (nh) {
 206                 if (nla_put_u32(skb, NDA_NH_ID, nh_id))
 207                         goto nla_put_failure;
 208         } else if (rdst) {
 209                 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST,
 210                                                   &rdst->remote_ip))
 211                         goto nla_put_failure;
 212
 213                 if (rdst->remote_port &&
 214                     rdst->remote_port != vxlan->cfg.dst_port &&
 215                     nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 216                         goto nla_put_failure;
 217                 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 218                     nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
 219                         goto nla_put_failure;
 220                 if (rdst->remote_ifindex &&
 221                     nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 222                         goto nla_put_failure;
 223         }
 224
 225         if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
 226             nla_put_u32(skb, NDA_SRC_VNI,
 227                         be32_to_cpu(fdb->vni)))
 228                 goto nla_put_failure;
 229
 230         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 231         ci.ndm_confirmed = 0;
 232         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 233         ci.ndm_refcnt    = 0;
 234
 235         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 236                 goto nla_put_failure;
 237
 238         nlmsg_end(skb, nlh);
 239         return 0;
 240
 241 nla_put_failure:
 242         nlmsg_cancel(skb, nlh);
 243         return -EMSGSIZE;
 244 }
 245
 246 static inline size_t vxlan_nlmsg_size(void)
 247 {
 248         return NLMSG_ALIGN(sizeof(struct ndmsg))
 249                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 250                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 251                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
 252                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
 253                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 254                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
 255                 + nla_total_size(sizeof(struct nda_cacheinfo));
 256 }
 257
 258 static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 259                                struct vxlan_rdst *rd, int type)
 260 {
 261         struct net *net = dev_net(vxlan->dev);
 262         struct sk_buff *skb;
 263         int err = -ENOBUFS;
 264
 265         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 266         if (skb == NULL)
 267                 goto errout;
 268
 269         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 270         if (err < 0) {
 271                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 272                 WARN_ON(err == -EMSGSIZE);
 273                 kfree_skb(skb);
 274                 goto errout;
 275         }
 276
 277         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 278         return;
 279 errout:
 280         if (err < 0)
 281                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 282 }
 283
 284 static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan,
 285                             const struct vxlan_fdb *fdb,
 286                             const struct vxlan_rdst *rd,
 287                             struct netlink_ext_ack *extack,
 288                             struct switchdev_notifier_vxlan_fdb_info *fdb_info)
 289 {
 290         fdb_info->info.dev = vxlan->dev;
 291         fdb_info->info.extack = extack;
 292         fdb_info->remote_ip = rd->remote_ip;
 293         fdb_info->remote_port = rd->remote_port;
 294         fdb_info->remote_vni = rd->remote_vni;
 295         fdb_info->remote_ifindex = rd->remote_ifindex;
 296         memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN);
 297         fdb_info->vni = fdb->vni;
 298         fdb_info->offloaded = rd->offloaded;
 299         fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER;
 300 }
 301
 302 static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
 303                                               struct vxlan_fdb *fdb,
 304                                               struct vxlan_rdst *rd,
 305                                               bool adding,
 306                                               struct netlink_ext_ack *extack)
 307 {
 308         struct switchdev_notifier_vxlan_fdb_info info;
 309         enum switchdev_notifier_type notifier_type;
 310         int ret;
 311
 312         if (WARN_ON(!rd))
 313                 return 0;
 314
 315         notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
 316                                : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
 317         vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info);
 318         ret = call_switchdev_notifiers(notifier_type, vxlan->dev,
 319                                        &info.info, extack);
 320         return notifier_to_errno(ret);
 321 }
 322
 323 static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 324                             struct vxlan_rdst *rd, int type, bool swdev_notify,
 325                             struct netlink_ext_ack *extack)
 326 {
 327         int err;
 328
 329         if (swdev_notify && rd) {
 330                 switch (type) {
 331                 case RTM_NEWNEIGH:
 332                         err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
 333                                                                  true, extack);
 334                         if (err)
 335                                 return err;
 336                         break;
 337                 case RTM_DELNEIGH:
 338                         vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
 339                                                            false, extack);
 340                         break;
 341                 }
 342         }
 343
 344         __vxlan_fdb_notify(vxlan, fdb, rd, type);
 345         return 0;
 346 }
 347
 348 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 349 {
 350         struct vxlan_dev *vxlan = netdev_priv(dev);
 351         struct vxlan_fdb f = {
 352                 .state = NUD_STALE,
 353         };
 354         struct vxlan_rdst remote = {
 355                 .remote_ip = *ipa, /* goes to NDA_DST */
 356                 .remote_vni = cpu_to_be32(VXLAN_N_VID),
 357         };
 358
 359         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
 360 }
 361
 362 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 363 {
 364         struct vxlan_fdb f = {
 365                 .state = NUD_STALE,
 366         };
 367         struct vxlan_rdst remote = { };
 368
 369         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 370
 371         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
 372 }
 373
 374 /* Hash Ethernet address */
 375 static u32 eth_hash(const unsigned char *addr)
 376 {
 377         u64 value = get_unaligned((u64 *)addr);
 378
 379         /* only want 6 bytes */
 380 #ifdef __BIG_ENDIAN
 381         value >>= 16;
 382 #else
 383         value <<= 16;
 384 #endif
 385         return hash_64(value, FDB_HASH_BITS);
 386 }
 387
 388 u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
 389 {
 390         /* use 1 byte of OUI and 3 bytes of NIC */
 391         u32 key = get_unaligned((u32 *)(addr + 2));
 392
 393         return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
 394 }
 395
 396 u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni)
 397 {
 398         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
 399                 return eth_vni_hash(mac, vni);
 400         else
 401                 return eth_hash(mac);
 402 }
 403
 404 /* Hash chain to use given mac address */
 405 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 406                                                 const u8 *mac, __be32 vni)
 407 {
 408         return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)];
 409 }
 410
 411 /* Look up Ethernet address in forwarding table */
 412 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 413                                           const u8 *mac, __be32 vni)
 414 {
 415         struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
 416         struct vxlan_fdb *f;
 417
 418         hlist_for_each_entry_rcu(f, head, hlist) {
 419                 if (ether_addr_equal(mac, f->eth_addr)) {
 420                         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
 421                                 if (vni == f->vni)
 422                                         return f;
 423                         } else {
 424                                 return f;
 425                         }
 426                 }
 427         }
 428
 429         return NULL;
 430 }
 431
 432 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 433                                         const u8 *mac, __be32 vni)
 434 {
 435         struct vxlan_fdb *f;
 436
 437         f = __vxlan_find_mac(vxlan, mac, vni);
 438         if (f && f->used != jiffies)
 439                 f->used = jiffies;
 440
 441         return f;
 442 }
 443
 444 /* caller should hold vxlan->hash_lock */
 445 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 446                                               union vxlan_addr *ip, __be16 port,
 447                                               __be32 vni, __u32 ifindex)
 448 {
 449         struct vxlan_rdst *rd;
 450
 451         list_for_each_entry(rd, &f->remotes, list) {
 452                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 453                     rd->remote_port == port &&
 454                     rd->remote_vni == vni &&
 455                     rd->remote_ifindex == ifindex)
 456                         return rd;
 457         }
 458
 459         return NULL;
 460 }
 461
 462 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
 463                       struct switchdev_notifier_vxlan_fdb_info *fdb_info)
 464 {
 465         struct vxlan_dev *vxlan = netdev_priv(dev);
 466         u8 eth_addr[ETH_ALEN + 2] = { 0 };
 467         struct vxlan_rdst *rdst;
 468         struct vxlan_fdb *f;
 469         int rc = 0;
 470
 471         if (is_multicast_ether_addr(mac) ||
 472             is_zero_ether_addr(mac))
 473                 return -EINVAL;
 474
 475         ether_addr_copy(eth_addr, mac);
 476
 477         rcu_read_lock();
 478
 479         f = __vxlan_find_mac(vxlan, eth_addr, vni);
 480         if (!f) {
 481                 rc = -ENOENT;
 482                 goto out;
 483         }
 484
 485         rdst = first_remote_rcu(f);
 486         vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info);
 487
 488 out:
 489         rcu_read_unlock();
 490         return rc;
 491 }
 492 EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc);
 493
 494 static int vxlan_fdb_notify_one(struct notifier_block *nb,
 495                                 const struct vxlan_dev *vxlan,
 496                                 const struct vxlan_fdb *f,
 497                                 const struct vxlan_rdst *rdst,
 498                                 struct netlink_ext_ack *extack)
 499 {
 500         struct switchdev_notifier_vxlan_fdb_info fdb_info;
 501         int rc;
 502
 503         vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info);
 504         rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
 505                                &fdb_info);
 506         return notifier_to_errno(rc);
 507 }
 508
 509 int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
 510                      struct notifier_block *nb,
 511                      struct netlink_ext_ack *extack)
 512 {
 513         struct vxlan_dev *vxlan;
 514         struct vxlan_rdst *rdst;
 515         struct vxlan_fdb *f;
 516         unsigned int h;
 517         int rc = 0;
 518
 519         if (!netif_is_vxlan(dev))
 520                 return -EINVAL;
 521         vxlan = netdev_priv(dev);
 522
 523         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 524                 spin_lock_bh(&vxlan->hash_lock[h]);
 525                 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) {
 526                         if (f->vni == vni) {
 527                                 list_for_each_entry(rdst, &f->remotes, list) {
 528                                         rc = vxlan_fdb_notify_one(nb, vxlan,
 529                                                                   f, rdst,
 530                                                                   extack);
 531                                         if (rc)
 532                                                 goto unlock;
 533                                 }
 534                         }
 535                 }
 536                 spin_unlock_bh(&vxlan->hash_lock[h]);
 537         }
 538         return 0;
 539
 540 unlock:
 541         spin_unlock_bh(&vxlan->hash_lock[h]);
 542         return rc;
 543 }
 544 EXPORT_SYMBOL_GPL(vxlan_fdb_replay);
 545
 546 void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
 547 {
 548         struct vxlan_dev *vxlan;
 549         struct vxlan_rdst *rdst;
 550         struct vxlan_fdb *f;
 551         unsigned int h;
 552
 553         if (!netif_is_vxlan(dev))
 554                 return;
 555         vxlan = netdev_priv(dev);
 556
 557         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 558                 spin_lock_bh(&vxlan->hash_lock[h]);
 559                 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist)
 560                         if (f->vni == vni)
 561                                 list_for_each_entry(rdst, &f->remotes, list)
 562                                         rdst->offloaded = false;
 563                 spin_unlock_bh(&vxlan->hash_lock[h]);
 564         }
 565
 566 }
 567 EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload);
 568
 569 /* Replace destination of unicast mac */
 570 static int vxlan_fdb_replace(struct vxlan_fdb *f,
 571                              union vxlan_addr *ip, __be16 port, __be32 vni,
 572                              __u32 ifindex, struct vxlan_rdst *oldrd)
 573 {
 574         struct vxlan_rdst *rd;
 575
 576         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 577         if (rd)
 578                 return 0;
 579
 580         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 581         if (!rd)
 582                 return 0;
 583
 584         *oldrd = *rd;
 585         dst_cache_reset(&rd->dst_cache);
 586         rd->remote_ip = *ip;
 587         rd->remote_port = port;
 588         rd->remote_vni = vni;
 589         rd->remote_ifindex = ifindex;
 590         rd->offloaded = false;
 591         return 1;
 592 }
 593
 594 /* Add/update destinations for multicast */
 595 static int vxlan_fdb_append(struct vxlan_fdb *f,
 596                             union vxlan_addr *ip, __be16 port, __be32 vni,
 597                             __u32 ifindex, struct vxlan_rdst **rdp)
 598 {
 599         struct vxlan_rdst *rd;
 600
 601         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 602         if (rd)
 603                 return 0;
 604
 605         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 606         if (rd == NULL)
 607                 return -ENOMEM;
 608
 609         if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
 610                 kfree(rd);
 611                 return -ENOMEM;
 612         }
 613
 614         rd->remote_ip = *ip;
 615         rd->remote_port = port;
 616         rd->offloaded = false;
 617         rd->remote_vni = vni;
 618         rd->remote_ifindex = ifindex;
 619
 620         list_add_tail_rcu(&rd->list, &f->remotes);
 621
 622         *rdp = rd;
 623         return 1;
 624 }
 625
 626 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
 627                                           unsigned int off,
 628                                           struct vxlanhdr *vh, size_t hdrlen,
 629                                           __be32 vni_field,
 630                                           struct gro_remcsum *grc,
 631                                           bool nopartial)
 632 {
 633         size_t start, offset;
 634
 635         if (skb->remcsum_offload)
 636                 return vh;
 637
 638         if (!NAPI_GRO_CB(skb)->csum_valid)
 639                 return NULL;
 640
 641         start = vxlan_rco_start(vni_field);
 642         offset = start + vxlan_rco_offset(vni_field);
 643
 644         vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
 645                                      start, offset, grc, nopartial);
 646
 647         skb->remcsum_offload = 1;
 648
 649         return vh;
 650 }
 651
 652 static struct sk_buff *vxlan_gro_receive(struct sock *sk,
 653                                          struct list_head *head,
 654                                          struct sk_buff *skb)
 655 {
 656         struct sk_buff *pp = NULL;
 657         struct sk_buff *p;
 658         struct vxlanhdr *vh, *vh2;
 659         unsigned int hlen, off_vx;
 660         int flush = 1;
 661         struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
 662         __be32 flags;
 663         struct gro_remcsum grc;
 664
 665         skb_gro_remcsum_init(&grc);
 666
 667         off_vx = skb_gro_offset(skb);
 668         hlen = off_vx + sizeof(*vh);
 669         vh = skb_gro_header(skb, hlen, off_vx);
 670         if (unlikely(!vh))
 671                 goto out;
 672
 673         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 674
 675         flags = vh->vx_flags;
 676
 677         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
 678                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
 679                                        vh->vx_vni, &grc,
 680                                        !!(vs->flags &
 681                                           VXLAN_F_REMCSUM_NOPARTIAL));
 682
 683                 if (!vh)
 684                         goto out;
 685         }
 686
 687         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 688
 689         list_for_each_entry(p, head, list) {
 690                 if (!NAPI_GRO_CB(p)->same_flow)
 691                         continue;
 692
 693                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
 694                 if (vh->vx_flags != vh2->vx_flags ||
 695                     vh->vx_vni != vh2->vx_vni) {
 696                         NAPI_GRO_CB(p)->same_flow = 0;
 697                         continue;
 698                 }
 699         }
 700
 701         pp = call_gro_receive(eth_gro_receive, head, skb);
 702         flush = 0;
 703
 704 out:
 705         skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
 706
 707         return pp;
 708 }
 709
 710 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
 711 {
 712         /* Sets 'skb->inner_mac_header' since we are always called with
 713          * 'skb->encapsulation' set.
 714          */
 715         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 716 }
 717
 718 static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, const u8 *mac,
 719                                          __u16 state, __be32 src_vni,
 720                                          __u16 ndm_flags)
 721 {
 722         struct vxlan_fdb *f;
 723
 724         f = kmalloc(sizeof(*f), GFP_ATOMIC);
 725         if (!f)
 726                 return NULL;
 727         f->state = state;
 728         f->flags = ndm_flags;
 729         f->updated = f->used = jiffies;
 730         f->vni = src_vni;
 731         f->nh = NULL;
 732         RCU_INIT_POINTER(f->vdev, vxlan);
 733         INIT_LIST_HEAD(&f->nh_list);
 734         INIT_LIST_HEAD(&f->remotes);
 735         memcpy(f->eth_addr, mac, ETH_ALEN);
 736
 737         return f;
 738 }
 739
 740 static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac,
 741                              __be32 src_vni, struct vxlan_fdb *f)
 742 {
 743         ++vxlan->addrcnt;
 744         hlist_add_head_rcu(&f->hlist,
 745                            vxlan_fdb_head(vxlan, mac, src_vni));
 746 }
 747
 748 static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 749                                u32 nhid, struct netlink_ext_ack *extack)
 750 {
 751         struct nexthop *old_nh = rtnl_dereference(fdb->nh);
 752         struct nexthop *nh;
 753         int err = -EINVAL;
 754
 755         if (old_nh && old_nh->id == nhid)
 756                 return 0;
 757
 758         nh = nexthop_find_by_id(vxlan->net, nhid);
 759         if (!nh) {
 760                 NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
 761                 goto err_inval;
 762         }
 763
 764         if (!nexthop_get(nh)) {
 765                 NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
 766                 nh = NULL;
 767                 goto err_inval;
 768         }
 769         if (!nexthop_is_fdb(nh)) {
 770                 NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop");
 771                 goto err_inval;
 772         }
 773
 774         if (!nexthop_is_multipath(nh)) {
 775                 NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group");
 776                 goto err_inval;
 777         }
 778
 779         /* check nexthop group family */
 780         switch (vxlan->default_dst.remote_ip.sa.sa_family) {
 781         case AF_INET:
 782                 if (!nexthop_has_v4(nh)) {
 783                         err = -EAFNOSUPPORT;
 784                         NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
 785                         goto err_inval;
 786                 }
 787                 break;
 788         case AF_INET6:
 789                 if (nexthop_has_v4(nh)) {
 790                         err = -EAFNOSUPPORT;
 791                         NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
 792                         goto err_inval;
 793                 }
 794         }
 795
 796         if (old_nh) {
 797                 list_del_rcu(&fdb->nh_list);
 798                 nexthop_put(old_nh);
 799         }
 800         rcu_assign_pointer(fdb->nh, nh);
 801         list_add_tail_rcu(&fdb->nh_list, &nh->fdb_list);
 802         return 1;
 803
 804 err_inval:
 805         if (nh)
 806                 nexthop_put(nh);
 807         return err;
 808 }
 809
 810 int vxlan_fdb_create(struct vxlan_dev *vxlan,
 811                      const u8 *mac, union vxlan_addr *ip,
 812                      __u16 state, __be16 port, __be32 src_vni,
 813                      __be32 vni, __u32 ifindex, __u16 ndm_flags,
 814                      u32 nhid, struct vxlan_fdb **fdb,
 815                      struct netlink_ext_ack *extack)
 816 {
 817         struct vxlan_rdst *rd = NULL;
 818         struct vxlan_fdb *f;
 819         int rc;
 820
 821         if (vxlan->cfg.addrmax &&
 822             vxlan->addrcnt >= vxlan->cfg.addrmax)
 823                 return -ENOSPC;
 824
 825         netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 826         f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
 827         if (!f)
 828                 return -ENOMEM;
 829
 830         if (nhid)
 831                 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
 832         else
 833                 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 834         if (rc < 0)
 835                 goto errout;
 836
 837         *fdb = f;
 838
 839         return 0;
 840
 841 errout:
 842         kfree(f);
 843         return rc;
 844 }
 845
 846 static void __vxlan_fdb_free(struct vxlan_fdb *f)
 847 {
 848         struct vxlan_rdst *rd, *nd;
 849         struct nexthop *nh;
 850
 851         nh = rcu_dereference_raw(f->nh);
 852         if (nh) {
 853                 rcu_assign_pointer(f->nh, NULL);
 854                 rcu_assign_pointer(f->vdev, NULL);
 855                 nexthop_put(nh);
 856         }
 857
 858         list_for_each_entry_safe(rd, nd, &f->remotes, list) {
 859                 dst_cache_destroy(&rd->dst_cache);
 860                 kfree(rd);
 861         }
 862         kfree(f);
 863 }
 864
 865 static void vxlan_fdb_free(struct rcu_head *head)
 866 {
 867         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 868
 869         __vxlan_fdb_free(f);
 870 }
 871
 872 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
 873                               bool do_notify, bool swdev_notify)
 874 {
 875         struct vxlan_rdst *rd;
 876
 877         netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr);
 878
 879         --vxlan->addrcnt;
 880         if (do_notify) {
 881                 if (rcu_access_pointer(f->nh))
 882                         vxlan_fdb_notify(vxlan, f, NULL, RTM_DELNEIGH,
 883                                          swdev_notify, NULL);
 884                 else
 885                         list_for_each_entry(rd, &f->remotes, list)
 886                                 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH,
 887                                                  swdev_notify, NULL);
 888         }
 889
 890         hlist_del_rcu(&f->hlist);
 891         list_del_rcu(&f->nh_list);
 892         call_rcu(&f->rcu, vxlan_fdb_free);
 893 }
 894
 895 static void vxlan_dst_free(struct rcu_head *head)
 896 {
 897         struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
 898
 899         dst_cache_destroy(&rd->dst_cache);
 900         kfree(rd);
 901 }
 902
 903 static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
 904                                      union vxlan_addr *ip,
 905                                      __u16 state, __u16 flags,
 906                                      __be16 port, __be32 vni,
 907                                      __u32 ifindex, __u16 ndm_flags,
 908                                      struct vxlan_fdb *f, u32 nhid,
 909                                      bool swdev_notify,
 910                                      struct netlink_ext_ack *extack)
 911 {
 912         __u16 fdb_flags = (ndm_flags & ~NTF_USE);
 913         struct vxlan_rdst *rd = NULL;
 914         struct vxlan_rdst oldrd;
 915         int notify = 0;
 916         int rc = 0;
 917         int err;
 918
 919         if (nhid && !rcu_access_pointer(f->nh)) {
 920                 NL_SET_ERR_MSG(extack,
 921                                "Cannot replace an existing non nexthop fdb with a nexthop");
 922                 return -EOPNOTSUPP;
 923         }
 924
 925         if (nhid && (flags & NLM_F_APPEND)) {
 926                 NL_SET_ERR_MSG(extack,
 927                                "Cannot append to a nexthop fdb");
 928                 return -EOPNOTSUPP;
 929         }
 930
 931         /* Do not allow an externally learned entry to take over an entry added
 932          * by the user.
 933          */
 934         if (!(fdb_flags & NTF_EXT_LEARNED) ||
 935             !(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
 936                 if (f->state != state) {
 937                         f->state = state;
 938                         f->updated = jiffies;
 939                         notify = 1;
 940                 }
 941                 if (f->flags != fdb_flags) {
 942                         f->flags = fdb_flags;
 943                         f->updated = jiffies;
 944                         notify = 1;
 945                 }
 946         }
 947
 948         if ((flags & NLM_F_REPLACE)) {
 949                 /* Only change unicasts */
 950                 if (!(is_multicast_ether_addr(f->eth_addr) ||
 951                       is_zero_ether_addr(f->eth_addr))) {
 952                         if (nhid) {
 953                                 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
 954                                 if (rc < 0)
 955                                         return rc;
 956                         } else {
 957                                 rc = vxlan_fdb_replace(f, ip, port, vni,
 958                                                        ifindex, &oldrd);
 959                         }
 960                         notify |= rc;
 961                 } else {
 962                         NL_SET_ERR_MSG(extack, "Cannot replace non-unicast fdb entries");
 963                         return -EOPNOTSUPP;
 964                 }
 965         }
 966         if ((flags & NLM_F_APPEND) &&
 967             (is_multicast_ether_addr(f->eth_addr) ||
 968              is_zero_ether_addr(f->eth_addr))) {
 969                 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 970
 971                 if (rc < 0)
 972                         return rc;
 973                 notify |= rc;
 974         }
 975
 976         if (ndm_flags & NTF_USE)
 977                 f->used = jiffies;
 978
 979         if (notify) {
 980                 if (rd == NULL)
 981                         rd = first_remote_rtnl(f);
 982
 983                 err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH,
 984                                        swdev_notify, extack);
 985                 if (err)
 986                         goto err_notify;
 987         }
 988
 989         return 0;
 990
 991 err_notify:
 992         if (nhid)
 993                 return err;
 994         if ((flags & NLM_F_REPLACE) && rc)
 995                 *rd = oldrd;
 996         else if ((flags & NLM_F_APPEND) && rc) {
 997                 list_del_rcu(&rd->list);
 998                 call_rcu(&rd->rcu, vxlan_dst_free);
 999         }
1000         return err;
1001 }
1002
1003 static int vxlan_fdb_update_create(struct vxlan_dev *vxlan,
1004                                    const u8 *mac, union vxlan_addr *ip,
1005                                    __u16 state, __u16 flags,
1006                                    __be16 port, __be32 src_vni, __be32 vni,
1007                                    __u32 ifindex, __u16 ndm_flags, u32 nhid,
1008                                    bool swdev_notify,
1009                                    struct netlink_ext_ack *extack)
1010 {
1011         __u16 fdb_flags = (ndm_flags & ~NTF_USE);
1012         struct vxlan_fdb *f;
1013         int rc;
1014
1015         /* Disallow replace to add a multicast entry */
1016         if ((flags & NLM_F_REPLACE) &&
1017             (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
1018                 return -EOPNOTSUPP;
1019
1020         netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
1021         rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
1022                               vni, ifindex, fdb_flags, nhid, &f, extack);
1023         if (rc < 0)
1024                 return rc;
1025
1026         vxlan_fdb_insert(vxlan, mac, src_vni, f);
1027         rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
1028                               swdev_notify, extack);
1029         if (rc)
1030                 goto err_notify;
1031
1032         return 0;
1033
1034 err_notify:
1035         vxlan_fdb_destroy(vxlan, f, false, false);
1036         return rc;
1037 }
1038
1039 /* Add new entry to forwarding table -- assumes lock held */
1040 int vxlan_fdb_update(struct vxlan_dev *vxlan,
1041                      const u8 *mac, union vxlan_addr *ip,
1042                      __u16 state, __u16 flags,
1043                      __be16 port, __be32 src_vni, __be32 vni,
1044                      __u32 ifindex, __u16 ndm_flags, u32 nhid,
1045                      bool swdev_notify,
1046                      struct netlink_ext_ack *extack)
1047 {
1048         struct vxlan_fdb *f;
1049
1050         f = __vxlan_find_mac(vxlan, mac, src_vni);
1051         if (f) {
1052                 if (flags & NLM_F_EXCL) {
1053                         netdev_dbg(vxlan->dev,
1054                                    "lost race to create %pM\n", mac);
1055                         return -EEXIST;
1056                 }
1057
1058                 return vxlan_fdb_update_existing(vxlan, ip, state, flags, port,
1059                                                  vni, ifindex, ndm_flags, f,
1060                                                  nhid, swdev_notify, extack);
1061         } else {
1062                 if (!(flags & NLM_F_CREATE))
1063                         return -ENOENT;
1064
1065                 return vxlan_fdb_update_create(vxlan, mac, ip, state, flags,
1066                                                port, src_vni, vni, ifindex,
1067                                                ndm_flags, nhid, swdev_notify,
1068                                                extack);
1069         }
1070 }
1071
1072 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
1073                                   struct vxlan_rdst *rd, bool swdev_notify)
1074 {
1075         list_del_rcu(&rd->list);
1076         vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL);
1077         call_rcu(&rd->rcu, vxlan_dst_free);
1078 }
1079
1080 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
1081                            union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
1082                            __be32 *vni, u32 *ifindex, u32 *nhid,
1083                            struct netlink_ext_ack *extack)
1084 {
1085         struct net *net = dev_net(vxlan->dev);
1086         int err;
1087
1088         if (tb[NDA_NH_ID] &&
1089             (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] || tb[NDA_PORT])) {
1090                 NL_SET_ERR_MSG(extack, "DST, VNI, ifindex and port are mutually exclusive with NH_ID");
1091                 return -EINVAL;
1092         }
1093
1094         if (tb[NDA_DST]) {
1095                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
1096                 if (err) {
1097                         NL_SET_ERR_MSG(extack, "Unsupported address family");
1098                         return err;
1099                 }
1100         } else {
1101                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
1102
1103                 if (remote->sa.sa_family == AF_INET) {
1104                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
1105                         ip->sa.sa_family = AF_INET;
1106 #if IS_ENABLED(CONFIG_IPV6)
1107                 } else {
1108                         ip->sin6.sin6_addr = in6addr_any;
1109                         ip->sa.sa_family = AF_INET6;
1110 #endif
1111                 }
1112         }
1113
1114         if (tb[NDA_PORT]) {
1115                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16)) {
1116                         NL_SET_ERR_MSG(extack, "Invalid vxlan port");
1117                         return -EINVAL;
1118                 }
1119                 *port = nla_get_be16(tb[NDA_PORT]);
1120         } else {
1121                 *port = vxlan->cfg.dst_port;
1122         }
1123
1124         if (tb[NDA_VNI]) {
1125                 if (nla_len(tb[NDA_VNI]) != sizeof(u32)) {
1126                         NL_SET_ERR_MSG(extack, "Invalid vni");
1127                         return -EINVAL;
1128                 }
1129                 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1130         } else {
1131                 *vni = vxlan->default_dst.remote_vni;
1132         }
1133
1134         if (tb[NDA_SRC_VNI]) {
1135                 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32)) {
1136                         NL_SET_ERR_MSG(extack, "Invalid src vni");
1137                         return -EINVAL;
1138                 }
1139                 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
1140         } else {
1141                 *src_vni = vxlan->default_dst.remote_vni;
1142         }
1143
1144         if (tb[NDA_IFINDEX]) {
1145                 struct net_device *tdev;
1146
1147                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32)) {
1148                         NL_SET_ERR_MSG(extack, "Invalid ifindex");
1149                         return -EINVAL;
1150                 }
1151                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
1152                 tdev = __dev_get_by_index(net, *ifindex);
1153                 if (!tdev) {
1154                         NL_SET_ERR_MSG(extack, "Device not found");
1155                         return -EADDRNOTAVAIL;
1156                 }
1157         } else {
1158                 *ifindex = 0;
1159         }
1160
1161         if (tb[NDA_NH_ID])
1162                 *nhid = nla_get_u32(tb[NDA_NH_ID]);
1163         else
1164                 *nhid = 0;
1165
1166         return 0;
1167 }
1168
1169 /* Add static entry (via netlink) */
1170 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1171                          struct net_device *dev,
1172                          const unsigned char *addr, u16 vid, u16 flags,
1173                          struct netlink_ext_ack *extack)
1174 {
1175         struct vxlan_dev *vxlan = netdev_priv(dev);
1176         /* struct net *net = dev_net(vxlan->dev); */
1177         union vxlan_addr ip;
1178         __be16 port;
1179         __be32 src_vni, vni;
1180         u32 ifindex, nhid;
1181         u32 hash_index;
1182         int err;
1183
1184         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
1185                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
1186                         ndm->ndm_state);
1187                 return -EINVAL;
1188         }
1189
1190         if (!tb || (!tb[NDA_DST] && !tb[NDA_NH_ID]))
1191                 return -EINVAL;
1192
1193         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
1194                               &nhid, extack);
1195         if (err)
1196                 return err;
1197
1198         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
1199                 return -EAFNOSUPPORT;
1200
1201         hash_index = fdb_head_index(vxlan, addr, src_vni);
1202         spin_lock_bh(&vxlan->hash_lock[hash_index]);
1203         err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
1204                                port, src_vni, vni, ifindex,
1205                                ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER,
1206                                nhid, true, extack);
1207         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1208
1209         return err;
1210 }
1211
1212 int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
1213                        const unsigned char *addr, union vxlan_addr ip,
1214                        __be16 port, __be32 src_vni, __be32 vni,
1215                        u32 ifindex, bool swdev_notify)
1216 {
1217         struct vxlan_rdst *rd = NULL;
1218         struct vxlan_fdb *f;
1219         int err = -ENOENT;
1220
1221         f = vxlan_find_mac(vxlan, addr, src_vni);
1222         if (!f)
1223                 return err;
1224
1225         if (!vxlan_addr_any(&ip)) {
1226                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
1227                 if (!rd)
1228                         goto out;
1229         }
1230
1231         /* remove a destination if it's not the only one on the list,
1232          * otherwise destroy the fdb entry
1233          */
1234         if (rd && !list_is_singular(&f->remotes)) {
1235                 vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify);
1236                 goto out;
1237         }
1238
1239         vxlan_fdb_destroy(vxlan, f, true, swdev_notify);
1240
1241 out:
1242         return 0;
1243 }
1244
1245 /* Delete entry (via netlink) */
1246 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1247                             struct net_device *dev,
1248                             const unsigned char *addr, u16 vid,
1249                             struct netlink_ext_ack *extack)
1250 {
1251         struct vxlan_dev *vxlan = netdev_priv(dev);
1252         union vxlan_addr ip;
1253         __be32 src_vni, vni;
1254         u32 ifindex, nhid;
1255         u32 hash_index;
1256         __be16 port;
1257         int err;
1258
1259         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
1260                               &nhid, extack);
1261         if (err)
1262                 return err;
1263
1264         hash_index = fdb_head_index(vxlan, addr, src_vni);
1265         spin_lock_bh(&vxlan->hash_lock[hash_index]);
1266         err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
1267                                  true);
1268         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1269
1270         return err;
1271 }
1272
1273 /* Dump forwarding table */
1274 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
1275                           struct net_device *dev,
1276                           struct net_device *filter_dev, int *idx)
1277 {
1278         struct vxlan_dev *vxlan = netdev_priv(dev);
1279         unsigned int h;
1280         int err = 0;
1281
1282         for (h = 0; h < FDB_HASH_SIZE; ++h) {
1283                 struct vxlan_fdb *f;
1284
1285                 rcu_read_lock();
1286                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
1287                         struct vxlan_rdst *rd;
1288
1289                         if (rcu_access_pointer(f->nh)) {
1290                                 if (*idx < cb->args[2])
1291                                         goto skip_nh;
1292                                 err = vxlan_fdb_info(skb, vxlan, f,
1293                                                      NETLINK_CB(cb->skb).portid,
1294                                                      cb->nlh->nlmsg_seq,
1295                                                      RTM_NEWNEIGH,
1296                                                      NLM_F_MULTI, NULL);
1297                                 if (err < 0) {
1298                                         rcu_read_unlock();
1299                                         goto out;
1300                                 }
1301 skip_nh:
1302                                 *idx += 1;
1303                                 continue;
1304                         }
1305
1306                         list_for_each_entry_rcu(rd, &f->remotes, list) {
1307                                 if (*idx < cb->args[2])
1308                                         goto skip;
1309
1310                                 err = vxlan_fdb_info(skb, vxlan, f,
1311                                                      NETLINK_CB(cb->skb).portid,
1312                                                      cb->nlh->nlmsg_seq,
1313                                                      RTM_NEWNEIGH,
1314                                                      NLM_F_MULTI, rd);
1315                                 if (err < 0) {
1316                                         rcu_read_unlock();
1317                                         goto out;
1318                                 }
1319 skip:
1320                                 *idx += 1;
1321                         }
1322                 }
1323                 rcu_read_unlock();
1324         }
1325 out:
1326         return err;
1327 }
1328
1329 static int vxlan_fdb_get(struct sk_buff *skb,
1330                          struct nlattr *tb[],
1331                          struct net_device *dev,
1332                          const unsigned char *addr,
1333                          u16 vid, u32 portid, u32 seq,
1334                          struct netlink_ext_ack *extack)
1335 {
1336         struct vxlan_dev *vxlan = netdev_priv(dev);
1337         struct vxlan_fdb *f;
1338         __be32 vni;
1339         int err;
1340
1341         if (tb[NDA_VNI])
1342                 vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1343         else
1344                 vni = vxlan->default_dst.remote_vni;
1345
1346         rcu_read_lock();
1347
1348         f = __vxlan_find_mac(vxlan, addr, vni);
1349         if (!f) {
1350                 NL_SET_ERR_MSG(extack, "Fdb entry not found");
1351                 err = -ENOENT;
1352                 goto errout;
1353         }
1354
1355         err = vxlan_fdb_info(skb, vxlan, f, portid, seq,
1356                              RTM_NEWNEIGH, 0, first_remote_rcu(f));
1357 errout:
1358         rcu_read_unlock();
1359         return err;
1360 }
1361
1362 /* Watch incoming packets to learn mapping between Ethernet address
1363  * and Tunnel endpoint.
1364  * Return true if packet is bogus and should be dropped.
1365  */
1366 static bool vxlan_snoop(struct net_device *dev,
1367                         union vxlan_addr *src_ip, const u8 *src_mac,
1368                         u32 src_ifindex, __be32 vni)
1369 {
1370         struct vxlan_dev *vxlan = netdev_priv(dev);
1371         struct vxlan_fdb *f;
1372         u32 ifindex = 0;
1373
1374 #if IS_ENABLED(CONFIG_IPV6)
1375         if (src_ip->sa.sa_family == AF_INET6 &&
1376             (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
1377                 ifindex = src_ifindex;
1378 #endif
1379
1380         f = vxlan_find_mac(vxlan, src_mac, vni);
1381         if (likely(f)) {
1382                 struct vxlan_rdst *rdst = first_remote_rcu(f);
1383
1384                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
1385                            rdst->remote_ifindex == ifindex))
1386                         return false;
1387
1388                 /* Don't migrate static entries, drop packets */
1389                 if (f->state & (NUD_PERMANENT | NUD_NOARP))
1390                         return true;
1391
1392                 /* Don't override an fdb with nexthop with a learnt entry */
1393                 if (rcu_access_pointer(f->nh))
1394                         return true;
1395
1396                 if (net_ratelimit())
1397                         netdev_info(dev,
1398                                     "%pM migrated from %pIS to %pIS\n",
1399                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1400
1401                 rdst->remote_ip = *src_ip;
1402                 f->updated = jiffies;
1403                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL);
1404         } else {
1405                 u32 hash_index = fdb_head_index(vxlan, src_mac, vni);
1406
1407                 /* learned new entry */
1408                 spin_lock(&vxlan->hash_lock[hash_index]);
1409
1410                 /* close off race between vxlan_flush and incoming packets */
1411                 if (netif_running(dev))
1412                         vxlan_fdb_update(vxlan, src_mac, src_ip,
1413                                          NUD_REACHABLE,
1414                                          NLM_F_EXCL|NLM_F_CREATE,
1415                                          vxlan->cfg.dst_port,
1416                                          vni,
1417                                          vxlan->default_dst.remote_vni,
1418                                          ifindex, NTF_SELF, 0, true, NULL);
1419                 spin_unlock(&vxlan->hash_lock[hash_index]);
1420         }
1421
1422         return false;
1423 }
1424
1425 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1426 {
1427         struct vxlan_net *vn;
1428
1429         if (!vs)
1430                 return false;
1431         if (!refcount_dec_and_test(&vs->refcnt))
1432                 return false;
1433
1434         vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1435         spin_lock(&vn->sock_lock);
1436         hlist_del_rcu(&vs->hlist);
1437         udp_tunnel_notify_del_rx_port(vs->sock,
1438                                       (vs->flags & VXLAN_F_GPE) ?
1439                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
1440                                       UDP_TUNNEL_TYPE_VXLAN);
1441         spin_unlock(&vn->sock_lock);
1442
1443         return true;
1444 }
1445
1446 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1447 {
1448         struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1449 #if IS_ENABLED(CONFIG_IPV6)
1450         struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1451
1452         RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1453 #endif
1454
1455         RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1456         synchronize_net();
1457
1458         if (vxlan->cfg.flags & VXLAN_F_VNIFILTER)
1459                 vxlan_vs_del_vnigrp(vxlan);
1460         else
1461                 vxlan_vs_del_dev(vxlan);
1462
1463         if (__vxlan_sock_release_prep(sock4)) {
1464                 udp_tunnel_sock_release(sock4->sock);
1465                 kfree(sock4);
1466         }
1467
1468 #if IS_ENABLED(CONFIG_IPV6)
1469         if (__vxlan_sock_release_prep(sock6)) {
1470                 udp_tunnel_sock_release(sock6->sock);
1471                 kfree(sock6);
1472         }
1473 #endif
1474 }
1475
1476 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1477                           struct sk_buff *skb, u32 vxflags)
1478 {
1479         size_t start, offset;
1480
1481         if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1482                 goto out;
1483
1484         start = vxlan_rco_start(unparsed->vx_vni);
1485         offset = start + vxlan_rco_offset(unparsed->vx_vni);
1486
1487         if (!pskb_may_pull(skb, offset + sizeof(u16)))
1488                 return false;
1489
1490         skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1491                             !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1492 out:
1493         unparsed->vx_flags &= ~VXLAN_HF_RCO;
1494         unparsed->vx_vni &= VXLAN_VNI_MASK;
1495         return true;
1496 }
1497
1498 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1499                                 struct sk_buff *skb, u32 vxflags,
1500                                 struct vxlan_metadata *md)
1501 {
1502         struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1503         struct metadata_dst *tun_dst;
1504
1505         if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1506                 goto out;
1507
1508         md->gbp = ntohs(gbp->policy_id);
1509
1510         tun_dst = (struct metadata_dst *)skb_dst(skb);
1511         if (tun_dst) {
1512                 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1513                 tun_dst->u.tun_info.options_len = sizeof(*md);
1514         }
1515         if (gbp->dont_learn)
1516                 md->gbp |= VXLAN_GBP_DONT_LEARN;
1517
1518         if (gbp->policy_applied)
1519                 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1520
1521         /* In flow-based mode, GBP is carried in dst_metadata */
1522         if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1523                 skb->mark = md->gbp;
1524 out:
1525         unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1526 }
1527
1528 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1529                                 __be16 *protocol,
1530                                 struct sk_buff *skb, u32 vxflags)
1531 {
1532         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1533
1534         /* Need to have Next Protocol set for interfaces in GPE mode. */
1535         if (!gpe->np_applied)
1536                 return false;
1537         /* "The initial version is 0. If a receiver does not support the
1538          * version indicated it MUST drop the packet.
1539          */
1540         if (gpe->version != 0)
1541                 return false;
1542         /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1543          * processing MUST occur." However, we don't implement OAM
1544          * processing, thus drop the packet.
1545          */
1546         if (gpe->oam_flag)
1547                 return false;
1548
1549         *protocol = tun_p_to_eth_p(gpe->next_protocol);
1550         if (!*protocol)
1551                 return false;
1552
1553         unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1554         return true;
1555 }
1556
1557 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1558                           struct vxlan_sock *vs,
1559                           struct sk_buff *skb, __be32 vni)
1560 {
1561         union vxlan_addr saddr;
1562         u32 ifindex = skb->dev->ifindex;
1563
1564         skb_reset_mac_header(skb);
1565         skb->protocol = eth_type_trans(skb, vxlan->dev);
1566         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1567
1568         /* Ignore packet loops (and multicast echo) */
1569         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1570                 return false;
1571
1572         /* Get address from the outer IP header */
1573         if (vxlan_get_sk_family(vs) == AF_INET) {
1574                 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1575                 saddr.sa.sa_family = AF_INET;
1576 #if IS_ENABLED(CONFIG_IPV6)
1577         } else {
1578                 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1579                 saddr.sa.sa_family = AF_INET6;
1580 #endif
1581         }
1582
1583         if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1584             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1585                 return false;
1586
1587         return true;
1588 }
1589
1590 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1591                                   struct sk_buff *skb)
1592 {
1593         int err = 0;
1594
1595         if (vxlan_get_sk_family(vs) == AF_INET)
1596                 err = IP_ECN_decapsulate(oiph, skb);
1597 #if IS_ENABLED(CONFIG_IPV6)
1598         else
1599                 err = IP6_ECN_decapsulate(oiph, skb);
1600 #endif
1601
1602         if (unlikely(err) && log_ecn_error) {
1603                 if (vxlan_get_sk_family(vs) == AF_INET)
1604                         net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1605                                              &((struct iphdr *)oiph)->saddr,
1606                                              ((struct iphdr *)oiph)->tos);
1607                 else
1608                         net_info_ratelimited("non-ECT from %pI6\n",
1609                                              &((struct ipv6hdr *)oiph)->saddr);
1610         }
1611         return err <= 1;
1612 }
1613
1614 /* Callback from net/ipv4/udp.c to receive packets */
1615 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1616 {
1617         struct vxlan_vni_node *vninode = NULL;
1618         struct vxlan_dev *vxlan;
1619         struct vxlan_sock *vs;
1620         struct vxlanhdr unparsed;
1621         struct vxlan_metadata _md;
1622         struct vxlan_metadata *md = &_md;
1623         __be16 protocol = htons(ETH_P_TEB);
1624         bool raw_proto = false;
1625         void *oiph;
1626         __be32 vni = 0;
1627
1628         /* Need UDP and VXLAN header to be present */
1629         if (!pskb_may_pull(skb, VXLAN_HLEN))
1630                 goto drop;
1631
1632         unparsed = *vxlan_hdr(skb);
1633         /* VNI flag always required to be set */
1634         if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1635                 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1636                            ntohl(vxlan_hdr(skb)->vx_flags),
1637                            ntohl(vxlan_hdr(skb)->vx_vni));
1638                 /* Return non vxlan pkt */
1639                 goto drop;
1640         }
1641         unparsed.vx_flags &= ~VXLAN_HF_VNI;
1642         unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1643
1644         vs = rcu_dereference_sk_user_data(sk);
1645         if (!vs)
1646                 goto drop;
1647
1648         vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1649
1650         vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, &vninode);
1651         if (!vxlan)
1652                 goto drop;
1653
1654         /* For backwards compatibility, only allow reserved fields to be
1655          * used by VXLAN extensions if explicitly requested.
1656          */
1657         if (vs->flags & VXLAN_F_GPE) {
1658                 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1659                         goto drop;
1660                 raw_proto = true;
1661         }
1662
1663         if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1664                                    !net_eq(vxlan->net, dev_net(vxlan->dev))))
1665                 goto drop;
1666
1667         if (vs->flags & VXLAN_F_REMCSUM_RX)
1668                 if (unlikely(!vxlan_remcsum(&unparsed, skb, vs->flags)))
1669                         goto drop;
1670
1671         if (vxlan_collect_metadata(vs)) {
1672                 struct metadata_dst *tun_dst;
1673
1674                 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1675                                          key32_to_tunnel_id(vni), sizeof(*md));
1676
1677                 if (!tun_dst)
1678                         goto drop;
1679
1680                 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1681
1682                 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1683         } else {
1684                 memset(md, 0, sizeof(*md));
1685         }
1686
1687         if (vs->flags & VXLAN_F_GBP)
1688                 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1689         /* Note that GBP and GPE can never be active together. This is
1690          * ensured in vxlan_dev_configure.
1691          */
1692
1693         if (unparsed.vx_flags || unparsed.vx_vni) {
1694                 /* If there are any unprocessed flags remaining treat
1695                  * this as a malformed packet. This behavior diverges from
1696                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1697                  * in reserved fields are to be ignored. The approach here
1698                  * maintains compatibility with previous stack code, and also
1699                  * is more robust and provides a little more security in
1700                  * adding extensions to VXLAN.
1701                  */
1702                 goto drop;
1703         }
1704
1705         if (!raw_proto) {
1706                 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1707                         goto drop;
1708         } else {
1709                 skb_reset_mac_header(skb);
1710                 skb->dev = vxlan->dev;
1711                 skb->pkt_type = PACKET_HOST;
1712         }
1713
1714         oiph = skb_network_header(skb);
1715         skb_reset_network_header(skb);
1716
1717         if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1718                 ++vxlan->dev->stats.rx_frame_errors;
1719                 ++vxlan->dev->stats.rx_errors;
1720                 vxlan_vnifilter_count(vxlan, vni, vninode,
1721                                       VXLAN_VNI_STATS_RX_ERRORS, 0);
1722                 goto drop;
1723         }
1724
1725         rcu_read_lock();
1726
1727         if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
1728                 rcu_read_unlock();
1729                 dev_core_stats_rx_dropped_inc(vxlan->dev);
1730                 vxlan_vnifilter_count(vxlan, vni, vninode,
1731                                       VXLAN_VNI_STATS_RX_DROPS, 0);
1732                 goto drop;
1733         }
1734
1735         dev_sw_netstats_rx_add(vxlan->dev, skb->len);
1736         vxlan_vnifilter_count(vxlan, vni, vninode, VXLAN_VNI_STATS_RX, skb->len);
1737         gro_cells_receive(&vxlan->gro_cells, skb);
1738
1739         rcu_read_unlock();
1740
1741         return 0;
1742
1743 drop:
1744         /* Consume bad packet */
1745         kfree_skb(skb);
1746         return 0;
1747 }
1748
1749 /* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */
1750 static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb)
1751 {
1752         struct vxlan_dev *vxlan;
1753         struct vxlan_sock *vs;
1754         struct vxlanhdr *hdr;
1755         __be32 vni;
1756
1757         if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN))
1758                 return -EINVAL;
1759
1760         hdr = vxlan_hdr(skb);
1761
1762         if (!(hdr->vx_flags & VXLAN_HF_VNI))
1763                 return -EINVAL;
1764
1765         vs = rcu_dereference_sk_user_data(sk);
1766         if (!vs)
1767                 return -ENOENT;
1768
1769         vni = vxlan_vni(hdr->vx_vni);
1770         vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, NULL);
1771         if (!vxlan)
1772                 return -ENOENT;
1773
1774         return 0;
1775 }
1776
1777 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1778 {
1779         struct vxlan_dev *vxlan = netdev_priv(dev);
1780         struct arphdr *parp;
1781         u8 *arpptr, *sha;
1782         __be32 sip, tip;
1783         struct neighbour *n;
1784
1785         if (dev->flags & IFF_NOARP)
1786                 goto out;
1787
1788         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1789                 dev->stats.tx_dropped++;
1790                 goto out;
1791         }
1792         parp = arp_hdr(skb);
1793
1794         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1795              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1796             parp->ar_pro != htons(ETH_P_IP) ||
1797             parp->ar_op != htons(ARPOP_REQUEST) ||
1798             parp->ar_hln != dev->addr_len ||
1799             parp->ar_pln != 4)
1800                 goto out;
1801         arpptr = (u8 *)parp + sizeof(struct arphdr);
1802         sha = arpptr;
1803         arpptr += dev->addr_len;        /* sha */
1804         memcpy(&sip, arpptr, sizeof(sip));
1805         arpptr += sizeof(sip);
1806         arpptr += dev->addr_len;        /* tha */
1807         memcpy(&tip, arpptr, sizeof(tip));
1808
1809         if (ipv4_is_loopback(tip) ||
1810             ipv4_is_multicast(tip))
1811                 goto out;
1812
1813         n = neigh_lookup(&arp_tbl, &tip, dev);
1814
1815         if (n) {
1816                 struct vxlan_fdb *f;
1817                 struct sk_buff  *reply;
1818
1819                 if (!(READ_ONCE(n->nud_state) & NUD_CONNECTED)) {
1820                         neigh_release(n);
1821                         goto out;
1822                 }
1823
1824                 f = vxlan_find_mac(vxlan, n->ha, vni);
1825                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1826                         /* bridge-local neighbor */
1827                         neigh_release(n);
1828                         goto out;
1829                 }
1830
1831                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1832                                 n->ha, sha);
1833
1834                 neigh_release(n);
1835
1836                 if (reply == NULL)
1837                         goto out;
1838
1839                 skb_reset_mac_header(reply);
1840                 __skb_pull(reply, skb_network_offset(reply));
1841                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1842                 reply->pkt_type = PACKET_HOST;
1843
1844                 if (netif_rx(reply) == NET_RX_DROP) {
1845                         dev->stats.rx_dropped++;
1846                         vxlan_vnifilter_count(vxlan, vni, NULL,
1847                                               VXLAN_VNI_STATS_RX_DROPS, 0);
1848                 }
1849
1850         } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1851                 union vxlan_addr ipa = {
1852                         .sin.sin_addr.s_addr = tip,
1853                         .sin.sin_family = AF_INET,
1854                 };
1855
1856                 vxlan_ip_miss(dev, &ipa);
1857         }
1858 out:
1859         consume_skb(skb);
1860         return NETDEV_TX_OK;
1861 }
1862
1863 #if IS_ENABLED(CONFIG_IPV6)
1864 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1865         struct neighbour *n, bool isrouter)
1866 {
1867         struct net_device *dev = request->dev;
1868         struct sk_buff *reply;
1869         struct nd_msg *ns, *na;
1870         struct ipv6hdr *pip6;
1871         u8 *daddr;
1872         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1873         int ns_olen;
1874         int i, len;
1875
1876         if (dev == NULL || !pskb_may_pull(request, request->len))
1877                 return NULL;
1878
1879         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1880                 sizeof(*na) + na_olen + dev->needed_tailroom;
1881         reply = alloc_skb(len, GFP_ATOMIC);
1882         if (reply == NULL)
1883                 return NULL;
1884
1885         reply->protocol = htons(ETH_P_IPV6);
1886         reply->dev = dev;
1887         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1888         skb_push(reply, sizeof(struct ethhdr));
1889         skb_reset_mac_header(reply);
1890
1891         ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
1892
1893         daddr = eth_hdr(request)->h_source;
1894         ns_olen = request->len - skb_network_offset(request) -
1895                 sizeof(struct ipv6hdr) - sizeof(*ns);
1896         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1897                 if (!ns->opt[i + 1]) {
1898                         kfree_skb(reply);
1899                         return NULL;
1900                 }
1901                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1902                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1903                         break;
1904                 }
1905         }
1906
1907         /* Ethernet header */
1908         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1909         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1910         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1911         reply->protocol = htons(ETH_P_IPV6);
1912
1913         skb_pull(reply, sizeof(struct ethhdr));
1914         skb_reset_network_header(reply);
1915         skb_put(reply, sizeof(struct ipv6hdr));
1916
1917         /* IPv6 header */
1918
1919         pip6 = ipv6_hdr(reply);
1920         memset(pip6, 0, sizeof(struct ipv6hdr));
1921         pip6->version = 6;
1922         pip6->priority = ipv6_hdr(request)->priority;
1923         pip6->nexthdr = IPPROTO_ICMPV6;
1924         pip6->hop_limit = 255;
1925         pip6->daddr = ipv6_hdr(request)->saddr;
1926         pip6->saddr = *(struct in6_addr *)n->primary_key;
1927
1928         skb_pull(reply, sizeof(struct ipv6hdr));
1929         skb_reset_transport_header(reply);
1930
1931         /* Neighbor Advertisement */
1932         na = skb_put_zero(reply, sizeof(*na) + na_olen);
1933         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1934         na->icmph.icmp6_router = isrouter;
1935         na->icmph.icmp6_override = 1;
1936         na->icmph.icmp6_solicited = 1;
1937         na->target = ns->target;
1938         ether_addr_copy(&na->opt[2], n->ha);
1939         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1940         na->opt[1] = na_olen >> 3;
1941
1942         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1943                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1944                 csum_partial(na, sizeof(*na)+na_olen, 0));
1945
1946         pip6->payload_len = htons(sizeof(*na)+na_olen);
1947
1948         skb_push(reply, sizeof(struct ipv6hdr));
1949
1950         reply->ip_summed = CHECKSUM_UNNECESSARY;
1951
1952         return reply;
1953 }
1954
1955 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1956 {
1957         struct vxlan_dev *vxlan = netdev_priv(dev);
1958         const struct in6_addr *daddr;
1959         const struct ipv6hdr *iphdr;
1960         struct inet6_dev *in6_dev;
1961         struct neighbour *n;
1962         struct nd_msg *msg;
1963
1964         rcu_read_lock();
1965         in6_dev = __in6_dev_get(dev);
1966         if (!in6_dev)
1967                 goto out;
1968
1969         iphdr = ipv6_hdr(skb);
1970         daddr = &iphdr->daddr;
1971         msg = (struct nd_msg *)(iphdr + 1);
1972
1973         if (ipv6_addr_loopback(daddr) ||
1974             ipv6_addr_is_multicast(&msg->target))
1975                 goto out;
1976
1977         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1978
1979         if (n) {
1980                 struct vxlan_fdb *f;
1981                 struct sk_buff *reply;
1982
1983                 if (!(READ_ONCE(n->nud_state) & NUD_CONNECTED)) {
1984                         neigh_release(n);
1985                         goto out;
1986                 }
1987
1988                 f = vxlan_find_mac(vxlan, n->ha, vni);
1989                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1990                         /* bridge-local neighbor */
1991                         neigh_release(n);
1992                         goto out;
1993                 }
1994
1995                 reply = vxlan_na_create(skb, n,
1996                                         !!(f ? f->flags & NTF_ROUTER : 0));
1997
1998                 neigh_release(n);
1999
2000                 if (reply == NULL)
2001                         goto out;
2002
2003                 if (netif_rx(reply) == NET_RX_DROP) {
2004                         dev->stats.rx_dropped++;
2005                         vxlan_vnifilter_count(vxlan, vni, NULL,
2006                                               VXLAN_VNI_STATS_RX_DROPS, 0);
2007                 }
2008         } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
2009                 union vxlan_addr ipa = {
2010                         .sin6.sin6_addr = msg->target,
2011                         .sin6.sin6_family = AF_INET6,
2012                 };
2013
2014                 vxlan_ip_miss(dev, &ipa);
2015         }
2016
2017 out:
2018         rcu_read_unlock();
2019         consume_skb(skb);
2020         return NETDEV_TX_OK;
2021 }
2022 #endif
2023
2024 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
2025 {
2026         struct vxlan_dev *vxlan = netdev_priv(dev);
2027         struct neighbour *n;
2028
2029         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
2030                 return false;
2031
2032         n = NULL;
2033         switch (ntohs(eth_hdr(skb)->h_proto)) {
2034         case ETH_P_IP:
2035         {
2036                 struct iphdr *pip;
2037
2038                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
2039                         return false;
2040                 pip = ip_hdr(skb);
2041                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
2042                 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2043                         union vxlan_addr ipa = {
2044                                 .sin.sin_addr.s_addr = pip->daddr,
2045                                 .sin.sin_family = AF_INET,
2046                         };
2047
2048                         vxlan_ip_miss(dev, &ipa);
2049                         return false;
2050                 }
2051
2052                 break;
2053         }
2054 #if IS_ENABLED(CONFIG_IPV6)
2055         case ETH_P_IPV6:
2056         {
2057                 struct ipv6hdr *pip6;
2058
2059                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
2060                         return false;
2061                 pip6 = ipv6_hdr(skb);
2062                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
2063                 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2064                         union vxlan_addr ipa = {
2065                                 .sin6.sin6_addr = pip6->daddr,
2066                                 .sin6.sin6_family = AF_INET6,
2067                         };
2068
2069                         vxlan_ip_miss(dev, &ipa);
2070                         return false;
2071                 }
2072
2073                 break;
2074         }
2075 #endif
2076         default:
2077                 return false;
2078         }
2079
2080         if (n) {
2081                 bool diff;
2082
2083                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
2084                 if (diff) {
2085                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
2086                                 dev->addr_len);
2087                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
2088                 }
2089                 neigh_release(n);
2090                 return diff;
2091         }
2092
2093         return false;
2094 }
2095
2096 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, __be16 protocol)
2097 {
2098         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
2099
2100         gpe->np_applied = 1;
2101         gpe->next_protocol = tun_p_from_eth_p(protocol);
2102         if (!gpe->next_protocol)
2103                 return -EPFNOSUPPORT;
2104         return 0;
2105 }
2106
2107 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
2108                            int iphdr_len, __be32 vni,
2109                            struct vxlan_metadata *md, u32 vxflags,
2110                            bool udp_sum)
2111 {
2112         struct vxlanhdr *vxh;
2113         int min_headroom;
2114         int err;
2115         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
2116         __be16 inner_protocol = htons(ETH_P_TEB);
2117
2118         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
2119             skb->ip_summed == CHECKSUM_PARTIAL) {
2120                 int csum_start = skb_checksum_start_offset(skb);
2121
2122                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
2123                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
2124                     (skb->csum_offset == offsetof(struct udphdr, check) ||
2125                      skb->csum_offset == offsetof(struct tcphdr, check)))
2126                         type |= SKB_GSO_TUNNEL_REMCSUM;
2127         }
2128
2129         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
2130                         + VXLAN_HLEN + iphdr_len;
2131
2132         /* Need space for new headers (invalidates iph ptr) */
2133         err = skb_cow_head(skb, min_headroom);
2134         if (unlikely(err))
2135                 return err;
2136
2137         err = iptunnel_handle_offloads(skb, type);
2138         if (err)
2139                 return err;
2140
2141         vxh = __skb_push(skb, sizeof(*vxh));
2142         vxh->vx_flags = VXLAN_HF_VNI;
2143         vxh->vx_vni = vxlan_vni_field(vni);
2144
2145         if (type & SKB_GSO_TUNNEL_REMCSUM) {
2146                 unsigned int start;
2147
2148                 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
2149                 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
2150                 vxh->vx_flags |= VXLAN_HF_RCO;
2151
2152                 if (!skb_is_gso(skb)) {
2153                         skb->ip_summed = CHECKSUM_NONE;
2154                         skb->encapsulation = 0;
2155                 }
2156         }
2157
2158         if (vxflags & VXLAN_F_GBP)
2159                 vxlan_build_gbp_hdr(vxh, md);
2160         if (vxflags & VXLAN_F_GPE) {
2161                 err = vxlan_build_gpe_hdr(vxh, skb->protocol);
2162                 if (err < 0)
2163                         return err;
2164                 inner_protocol = skb->protocol;
2165         }
2166
2167         skb_set_inner_protocol(skb, inner_protocol);
2168         return 0;
2169 }
2170
2171 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
2172                                       struct vxlan_sock *sock4,
2173                                       struct sk_buff *skb, int oif, u8 tos,
2174                                       __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
2175                                       __u8 flow_flags, struct dst_cache *dst_cache,
2176                                       const struct ip_tunnel_info *info)
2177 {
2178         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2179         struct rtable *rt = NULL;
2180         struct flowi4 fl4;
2181
2182         if (!sock4)
2183                 return ERR_PTR(-EIO);
2184
2185         if (tos && !info)
2186                 use_cache = false;
2187         if (use_cache) {
2188                 rt = dst_cache_get_ip4(dst_cache, saddr);
2189                 if (rt)
2190                         return rt;
2191         }
2192
2193         memset(&fl4, 0, sizeof(fl4));
2194         fl4.flowi4_oif = oif;
2195         fl4.flowi4_tos = RT_TOS(tos);
2196         fl4.flowi4_mark = skb->mark;
2197         fl4.flowi4_proto = IPPROTO_UDP;
2198         fl4.daddr = daddr;
2199         fl4.saddr = *saddr;
2200         fl4.fl4_dport = dport;
2201         fl4.fl4_sport = sport;
2202         fl4.flowi4_flags = flow_flags;
2203
2204         rt = ip_route_output_key(vxlan->net, &fl4);
2205         if (!IS_ERR(rt)) {
2206                 if (rt->dst.dev == dev) {
2207                         netdev_dbg(dev, "circular route to %pI4\n", &daddr);
2208                         ip_rt_put(rt);
2209                         return ERR_PTR(-ELOOP);
2210                 }
2211
2212                 *saddr = fl4.saddr;
2213                 if (use_cache)
2214                         dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
2215         } else {
2216                 netdev_dbg(dev, "no route to %pI4\n", &daddr);
2217                 return ERR_PTR(-ENETUNREACH);
2218         }
2219         return rt;
2220 }
2221
2222 #if IS_ENABLED(CONFIG_IPV6)
2223 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
2224                                           struct net_device *dev,
2225                                           struct vxlan_sock *sock6,
2226                                           struct sk_buff *skb, int oif, u8 tos,
2227                                           __be32 label,
2228                                           const struct in6_addr *daddr,
2229                                           struct in6_addr *saddr,
2230                                           __be16 dport, __be16 sport,
2231                                           struct dst_cache *dst_cache,
2232                                           const struct ip_tunnel_info *info)
2233 {
2234         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2235         struct dst_entry *ndst;
2236         struct flowi6 fl6;
2237
2238         if (!sock6)
2239                 return ERR_PTR(-EIO);
2240
2241         if (tos && !info)
2242                 use_cache = false;
2243         if (use_cache) {
2244                 ndst = dst_cache_get_ip6(dst_cache, saddr);
2245                 if (ndst)
2246                         return ndst;
2247         }
2248
2249         memset(&fl6, 0, sizeof(fl6));
2250         fl6.flowi6_oif = oif;
2251         fl6.daddr = *daddr;
2252         fl6.saddr = *saddr;
2253         fl6.flowlabel = ip6_make_flowinfo(tos, label);
2254         fl6.flowi6_mark = skb->mark;
2255         fl6.flowi6_proto = IPPROTO_UDP;
2256         fl6.fl6_dport = dport;
2257         fl6.fl6_sport = sport;
2258
2259         ndst = ipv6_stub->ipv6_dst_lookup_flow(vxlan->net, sock6->sock->sk,
2260                                                &fl6, NULL);
2261         if (IS_ERR(ndst)) {
2262                 netdev_dbg(dev, "no route to %pI6\n", daddr);
2263                 return ERR_PTR(-ENETUNREACH);
2264         }
2265
2266         if (unlikely(ndst->dev == dev)) {
2267                 netdev_dbg(dev, "circular route to %pI6\n", daddr);
2268                 dst_release(ndst);
2269                 return ERR_PTR(-ELOOP);
2270         }
2271
2272         *saddr = fl6.saddr;
2273         if (use_cache)
2274                 dst_cache_set_ip6(dst_cache, ndst, saddr);
2275         return ndst;
2276 }
2277 #endif
2278
2279 /* Bypass encapsulation if the destination is local */
2280 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
2281                                struct vxlan_dev *dst_vxlan, __be32 vni,
2282                                bool snoop)
2283 {
2284         struct pcpu_sw_netstats *tx_stats, *rx_stats;
2285         union vxlan_addr loopback;
2286         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
2287         struct net_device *dev;
2288         int len = skb->len;
2289
2290         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
2291         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
2292         skb->pkt_type = PACKET_HOST;
2293         skb->encapsulation = 0;
2294         skb->dev = dst_vxlan->dev;
2295         __skb_pull(skb, skb_network_offset(skb));
2296
2297         if (remote_ip->sa.sa_family == AF_INET) {
2298                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2299                 loopback.sa.sa_family =  AF_INET;
2300 #if IS_ENABLED(CONFIG_IPV6)
2301         } else {
2302                 loopback.sin6.sin6_addr = in6addr_loopback;
2303                 loopback.sa.sa_family =  AF_INET6;
2304 #endif
2305         }
2306
2307         rcu_read_lock();
2308         dev = skb->dev;
2309         if (unlikely(!(dev->flags & IFF_UP))) {
2310                 kfree_skb(skb);
2311                 goto drop;
2312         }
2313
2314         if ((dst_vxlan->cfg.flags & VXLAN_F_LEARN) && snoop)
2315                 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni);
2316
2317         u64_stats_update_begin(&tx_stats->syncp);
2318         u64_stats_inc(&tx_stats->tx_packets);
2319         u64_stats_add(&tx_stats->tx_bytes, len);
2320         u64_stats_update_end(&tx_stats->syncp);
2321         vxlan_vnifilter_count(src_vxlan, vni, NULL, VXLAN_VNI_STATS_TX, len);
2322
2323         if (__netif_rx(skb) == NET_RX_SUCCESS) {
2324                 u64_stats_update_begin(&rx_stats->syncp);
2325                 u64_stats_inc(&rx_stats->rx_packets);
2326                 u64_stats_add(&rx_stats->rx_bytes, len);
2327                 u64_stats_update_end(&rx_stats->syncp);
2328                 vxlan_vnifilter_count(dst_vxlan, vni, NULL, VXLAN_VNI_STATS_RX,
2329                                       len);
2330         } else {
2331 drop:
2332                 dev->stats.rx_dropped++;
2333                 vxlan_vnifilter_count(dst_vxlan, vni, NULL,
2334                                       VXLAN_VNI_STATS_RX_DROPS, 0);
2335         }
2336         rcu_read_unlock();
2337 }
2338
2339 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2340                                  struct vxlan_dev *vxlan,
2341                                  union vxlan_addr *daddr,
2342                                  __be16 dst_port, int dst_ifindex, __be32 vni,
2343                                  struct dst_entry *dst,
2344                                  u32 rt_flags)
2345 {
2346 #if IS_ENABLED(CONFIG_IPV6)
2347         /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2348          * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2349          * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2350          */
2351         BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2352 #endif
2353         /* Bypass encapsulation if the destination is local */
2354         if (rt_flags & RTCF_LOCAL &&
2355             !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) &&
2356             vxlan->cfg.flags & VXLAN_F_LOCALBYPASS) {
2357                 struct vxlan_dev *dst_vxlan;
2358
2359                 dst_release(dst);
2360                 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2361                                            daddr->sa.sa_family, dst_port,
2362                                            vxlan->cfg.flags);
2363                 if (!dst_vxlan) {
2364                         dev->stats.tx_errors++;
2365                         vxlan_vnifilter_count(vxlan, vni, NULL,
2366                                               VXLAN_VNI_STATS_TX_ERRORS, 0);
2367                         kfree_skb(skb);
2368
2369                         return -ENOENT;
2370                 }
2371                 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni, true);
2372                 return 1;
2373         }
2374
2375         return 0;
2376 }
2377
2378 void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2379                     __be32 default_vni, struct vxlan_rdst *rdst, bool did_rsc)
2380 {
2381         struct dst_cache *dst_cache;
2382         struct ip_tunnel_info *info;
2383         struct vxlan_dev *vxlan = netdev_priv(dev);
2384         const struct iphdr *old_iph = ip_hdr(skb);
2385         union vxlan_addr *dst;
2386         union vxlan_addr remote_ip, local_ip;
2387         struct vxlan_metadata _md;
2388         struct vxlan_metadata *md = &_md;
2389         unsigned int pkt_len = skb->len;
2390         __be16 src_port = 0, dst_port;
2391         struct dst_entry *ndst = NULL;
2392         __u8 tos, ttl, flow_flags = 0;
2393         int ifindex;
2394         int err;
2395         u32 flags = vxlan->cfg.flags;
2396         bool udp_sum = false;
2397         bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2398         __be32 vni = 0;
2399 #if IS_ENABLED(CONFIG_IPV6)
2400         __be32 label;
2401 #endif
2402
2403         info = skb_tunnel_info(skb);
2404
2405         if (rdst) {
2406                 dst = &rdst->remote_ip;
2407                 if (vxlan_addr_any(dst)) {
2408                         if (did_rsc) {
2409                                 /* short-circuited back to local bridge */
2410                                 vxlan_encap_bypass(skb, vxlan, vxlan,
2411                                                    default_vni, true);
2412                                 return;
2413                         }
2414                         goto drop;
2415                 }
2416
2417                 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2418                 vni = (rdst->remote_vni) ? : default_vni;
2419                 ifindex = rdst->remote_ifindex;
2420                 local_ip = vxlan->cfg.saddr;
2421                 dst_cache = &rdst->dst_cache;
2422                 md->gbp = skb->mark;
2423                 if (flags & VXLAN_F_TTL_INHERIT) {
2424                         ttl = ip_tunnel_get_ttl(old_iph, skb);
2425                 } else {
2426                         ttl = vxlan->cfg.ttl;
2427                         if (!ttl && vxlan_addr_multicast(dst))
2428                                 ttl = 1;
2429                 }
2430
2431                 tos = vxlan->cfg.tos;
2432                 if (tos == 1)
2433                         tos = ip_tunnel_get_dsfield(old_iph, skb);
2434
2435                 if (dst->sa.sa_family == AF_INET)
2436                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2437                 else
2438                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2439 #if IS_ENABLED(CONFIG_IPV6)
2440                 label = vxlan->cfg.label;
2441 #endif
2442         } else {
2443                 if (!info) {
2444                         WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2445                                   dev->name);
2446                         goto drop;
2447                 }
2448                 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2449                 if (remote_ip.sa.sa_family == AF_INET) {
2450                         remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2451                         local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2452                 } else {
2453                         remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2454                         local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2455                 }
2456                 dst = &remote_ip;
2457                 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2458                 flow_flags = info->key.flow_flags;
2459                 vni = tunnel_id_to_key32(info->key.tun_id);
2460                 ifindex = 0;
2461                 dst_cache = &info->dst_cache;
2462                 if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
2463                         if (info->options_len < sizeof(*md))
2464                                 goto drop;
2465                         md = ip_tunnel_info_opts(info);
2466                 }
2467                 ttl = info->key.ttl;
2468                 tos = info->key.tos;
2469 #if IS_ENABLED(CONFIG_IPV6)
2470                 label = info->key.label;
2471 #endif
2472                 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2473         }
2474         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2475                                      vxlan->cfg.port_max, true);
2476
2477         rcu_read_lock();
2478         if (dst->sa.sa_family == AF_INET) {
2479                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2480                 struct rtable *rt;
2481                 __be16 df = 0;
2482
2483                 if (!ifindex)
2484                         ifindex = sock4->sock->sk->sk_bound_dev_if;
2485
2486                 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2487                                      dst->sin.sin_addr.s_addr,
2488                                      &local_ip.sin.sin_addr.s_addr,
2489                                      dst_port, src_port, flow_flags,
2490                                      dst_cache, info);
2491                 if (IS_ERR(rt)) {
2492                         err = PTR_ERR(rt);
2493                         goto tx_error;
2494                 }
2495
2496                 if (!info) {
2497                         /* Bypass encapsulation if the destination is local */
2498                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2499                                                     dst_port, ifindex, vni,
2500                                                     &rt->dst, rt->rt_flags);
2501                         if (err)
2502                                 goto out_unlock;
2503
2504                         if (vxlan->cfg.df == VXLAN_DF_SET) {
2505                                 df = htons(IP_DF);
2506                         } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) {
2507                                 struct ethhdr *eth = eth_hdr(skb);
2508
2509                                 if (ntohs(eth->h_proto) == ETH_P_IPV6 ||
2510                                     (ntohs(eth->h_proto) == ETH_P_IP &&
2511                                      old_iph->frag_off & htons(IP_DF)))
2512                                         df = htons(IP_DF);
2513                         }
2514                 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2515                         df = htons(IP_DF);
2516                 }
2517
2518                 ndst = &rt->dst;
2519                 err = skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM,
2520                                             netif_is_any_bridge_port(dev));
2521                 if (err < 0) {
2522                         goto tx_error;
2523                 } else if (err) {
2524                         if (info) {
2525                                 struct ip_tunnel_info *unclone;
2526                                 struct in_addr src, dst;
2527
2528                                 unclone = skb_tunnel_info_unclone(skb);
2529                                 if (unlikely(!unclone))
2530                                         goto tx_error;
2531
2532                                 src = remote_ip.sin.sin_addr;
2533                                 dst = local_ip.sin.sin_addr;
2534                                 unclone->key.u.ipv4.src = src.s_addr;
2535                                 unclone->key.u.ipv4.dst = dst.s_addr;
2536                         }
2537                         vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
2538                         dst_release(ndst);
2539                         goto out_unlock;
2540                 }
2541
2542                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2543                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2544                 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2545                                       vni, md, flags, udp_sum);
2546                 if (err < 0)
2547                         goto tx_error;
2548
2549                 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2550                                     dst->sin.sin_addr.s_addr, tos, ttl, df,
2551                                     src_port, dst_port, xnet, !udp_sum);
2552 #if IS_ENABLED(CONFIG_IPV6)
2553         } else {
2554                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2555
2556                 if (!ifindex)
2557                         ifindex = sock6->sock->sk->sk_bound_dev_if;
2558
2559                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2560                                         label, &dst->sin6.sin6_addr,
2561                                         &local_ip.sin6.sin6_addr,
2562                                         dst_port, src_port,
2563                                         dst_cache, info);
2564                 if (IS_ERR(ndst)) {
2565                         err = PTR_ERR(ndst);
2566                         ndst = NULL;
2567                         goto tx_error;
2568                 }
2569
2570                 if (!info) {
2571                         u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2572
2573                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2574                                                     dst_port, ifindex, vni,
2575                                                     ndst, rt6i_flags);
2576                         if (err)
2577                                 goto out_unlock;
2578                 }
2579
2580                 err = skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM,
2581                                             netif_is_any_bridge_port(dev));
2582                 if (err < 0) {
2583                         goto tx_error;
2584                 } else if (err) {
2585                         if (info) {
2586                                 struct ip_tunnel_info *unclone;
2587                                 struct in6_addr src, dst;
2588
2589                                 unclone = skb_tunnel_info_unclone(skb);
2590                                 if (unlikely(!unclone))
2591                                         goto tx_error;
2592
2593                                 src = remote_ip.sin6.sin6_addr;
2594                                 dst = local_ip.sin6.sin6_addr;
2595                                 unclone->key.u.ipv6.src = src;
2596                                 unclone->key.u.ipv6.dst = dst;
2597                         }
2598
2599                         vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
2600                         dst_release(ndst);
2601                         goto out_unlock;
2602                 }
2603
2604                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2605                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2606                 skb_scrub_packet(skb, xnet);
2607                 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2608                                       vni, md, flags, udp_sum);
2609                 if (err < 0)
2610                         goto tx_error;
2611
2612                 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2613                                      &local_ip.sin6.sin6_addr,
2614                                      &dst->sin6.sin6_addr, tos, ttl,
2615                                      label, src_port, dst_port, !udp_sum);
2616 #endif
2617         }
2618         vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX, pkt_len);
2619 out_unlock:
2620         rcu_read_unlock();
2621         return;
2622
2623 drop:
2624         dev->stats.tx_dropped++;
2625         vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_DROPS, 0);
2626         dev_kfree_skb(skb);
2627         return;
2628
2629 tx_error:
2630         rcu_read_unlock();
2631         if (err == -ELOOP)
2632                 dev->stats.collisions++;
2633         else if (err == -ENETUNREACH)
2634                 dev->stats.tx_carrier_errors++;
2635         dst_release(ndst);
2636         dev->stats.tx_errors++;
2637         vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_ERRORS, 0);
2638         kfree_skb(skb);
2639 }
2640
2641 static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev,
2642                           struct vxlan_fdb *f, __be32 vni, bool did_rsc)
2643 {
2644         struct vxlan_rdst nh_rdst;
2645         struct nexthop *nh;
2646         bool do_xmit;
2647         u32 hash;
2648
2649         memset(&nh_rdst, 0, sizeof(struct vxlan_rdst));
2650         hash = skb_get_hash(skb);
2651
2652         rcu_read_lock();
2653         nh = rcu_dereference(f->nh);
2654         if (!nh) {
2655                 rcu_read_unlock();
2656                 goto drop;
2657         }
2658         do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst);
2659         rcu_read_unlock();
2660
2661         if (likely(do_xmit))
2662                 vxlan_xmit_one(skb, dev, vni, &nh_rdst, did_rsc);
2663         else
2664                 goto drop;
2665
2666         return;
2667
2668 drop:
2669         dev->stats.tx_dropped++;
2670         vxlan_vnifilter_count(netdev_priv(dev), vni, NULL,
2671                               VXLAN_VNI_STATS_TX_DROPS, 0);
2672         dev_kfree_skb(skb);
2673 }
2674
2675 /* Transmit local packets over Vxlan
2676  *
2677  * Outer IP header inherits ECN and DF from inner header.
2678  * Outer UDP destination is the VXLAN assigned port.
2679  *           source port is based on hash of flow
2680  */
2681 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2682 {
2683         struct vxlan_dev *vxlan = netdev_priv(dev);
2684         struct vxlan_rdst *rdst, *fdst = NULL;
2685         const struct ip_tunnel_info *info;
2686         bool did_rsc = false;
2687         struct vxlan_fdb *f;
2688         struct ethhdr *eth;
2689         __be32 vni = 0;
2690
2691         info = skb_tunnel_info(skb);
2692
2693         skb_reset_mac_header(skb);
2694
2695         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2696                 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2697                     info->mode & IP_TUNNEL_INFO_TX) {
2698                         vni = tunnel_id_to_key32(info->key.tun_id);
2699                 } else {
2700                         if (info && info->mode & IP_TUNNEL_INFO_TX)
2701                                 vxlan_xmit_one(skb, dev, vni, NULL, false);
2702                         else
2703                                 kfree_skb(skb);
2704                         return NETDEV_TX_OK;
2705                 }
2706         }
2707
2708         if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2709                 eth = eth_hdr(skb);
2710                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2711                         return arp_reduce(dev, skb, vni);
2712 #if IS_ENABLED(CONFIG_IPV6)
2713                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2714                          pskb_may_pull(skb, sizeof(struct ipv6hdr) +
2715                                             sizeof(struct nd_msg)) &&
2716                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2717                         struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
2718
2719                         if (m->icmph.icmp6_code == 0 &&
2720                             m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2721                                 return neigh_reduce(dev, skb, vni);
2722                 }
2723 #endif
2724         }
2725
2726         if (vxlan->cfg.flags & VXLAN_F_MDB) {
2727                 struct vxlan_mdb_entry *mdb_entry;
2728
2729                 rcu_read_lock();
2730                 mdb_entry = vxlan_mdb_entry_skb_get(vxlan, skb, vni);
2731                 if (mdb_entry) {
2732                         netdev_tx_t ret;
2733
2734                         ret = vxlan_mdb_xmit(vxlan, mdb_entry, skb);
2735                         rcu_read_unlock();
2736                         return ret;
2737                 }
2738                 rcu_read_unlock();
2739         }
2740
2741         eth = eth_hdr(skb);
2742         f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2743         did_rsc = false;
2744
2745         if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2746             (ntohs(eth->h_proto) == ETH_P_IP ||
2747              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2748                 did_rsc = route_shortcircuit(dev, skb);
2749                 if (did_rsc)
2750                         f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2751         }
2752
2753         if (f == NULL) {
2754                 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2755                 if (f == NULL) {
2756                         if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2757                             !is_multicast_ether_addr(eth->h_dest))
2758                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2759
2760                         dev->stats.tx_dropped++;
2761                         vxlan_vnifilter_count(vxlan, vni, NULL,
2762                                               VXLAN_VNI_STATS_TX_DROPS, 0);
2763                         kfree_skb(skb);
2764                         return NETDEV_TX_OK;
2765                 }
2766         }
2767
2768         if (rcu_access_pointer(f->nh)) {
2769                 vxlan_xmit_nh(skb, dev, f,
2770                               (vni ? : vxlan->default_dst.remote_vni), did_rsc);
2771         } else {
2772                 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2773                         struct sk_buff *skb1;
2774
2775                         if (!fdst) {
2776                                 fdst = rdst;
2777                                 continue;
2778                         }
2779                         skb1 = skb_clone(skb, GFP_ATOMIC);
2780                         if (skb1)
2781                                 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2782                 }
2783                 if (fdst)
2784                         vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2785                 else
2786                         kfree_skb(skb);
2787         }
2788
2789         return NETDEV_TX_OK;
2790 }
2791
2792 /* Walk the forwarding table and purge stale entries */
2793 static void vxlan_cleanup(struct timer_list *t)
2794 {
2795         struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
2796         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2797         unsigned int h;
2798
2799         if (!netif_running(vxlan->dev))
2800                 return;
2801
2802         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2803                 struct hlist_node *p, *n;
2804
2805                 spin_lock(&vxlan->hash_lock[h]);
2806                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2807                         struct vxlan_fdb *f
2808                                 = container_of(p, struct vxlan_fdb, hlist);
2809                         unsigned long timeout;
2810
2811                         if (f->state & (NUD_PERMANENT | NUD_NOARP))
2812                                 continue;
2813
2814                         if (f->flags & NTF_EXT_LEARNED)
2815                                 continue;
2816
2817                         timeout = f->used + vxlan->cfg.age_interval * HZ;
2818                         if (time_before_eq(timeout, jiffies)) {
2819                                 netdev_dbg(vxlan->dev,
2820                                            "garbage collect %pM\n",
2821                                            f->eth_addr);
2822                                 f->state = NUD_STALE;
2823                                 vxlan_fdb_destroy(vxlan, f, true, true);
2824                         } else if (time_before(timeout, next_timer))
2825                                 next_timer = timeout;
2826                 }
2827                 spin_unlock(&vxlan->hash_lock[h]);
2828         }
2829
2830         mod_timer(&vxlan->age_timer, next_timer);
2831 }
2832
2833 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2834 {
2835         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2836
2837         spin_lock(&vn->sock_lock);
2838         hlist_del_init_rcu(&vxlan->hlist4.hlist);
2839 #if IS_ENABLED(CONFIG_IPV6)
2840         hlist_del_init_rcu(&vxlan->hlist6.hlist);
2841 #endif
2842         spin_unlock(&vn->sock_lock);
2843 }
2844
2845 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
2846                              struct vxlan_dev_node *node)
2847 {
2848         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2849         __be32 vni = vxlan->default_dst.remote_vni;
2850
2851         node->vxlan = vxlan;
2852         spin_lock(&vn->sock_lock);
2853         hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
2854         spin_unlock(&vn->sock_lock);
2855 }
2856
2857 /* Setup stats when device is created */
2858 static int vxlan_init(struct net_device *dev)
2859 {
2860         struct vxlan_dev *vxlan = netdev_priv(dev);
2861         int err;
2862
2863         if (vxlan->cfg.flags & VXLAN_F_VNIFILTER)
2864                 vxlan_vnigroup_init(vxlan);
2865
2866         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2867         if (!dev->tstats) {
2868                 err = -ENOMEM;
2869                 goto err_vnigroup_uninit;
2870         }
2871
2872         err = gro_cells_init(&vxlan->gro_cells, dev);
2873         if (err)
2874                 goto err_free_percpu;
2875
2876         err = vxlan_mdb_init(vxlan);
2877         if (err)
2878                 goto err_gro_cells_destroy;
2879
2880         return 0;
2881
2882 err_gro_cells_destroy:
2883         gro_cells_destroy(&vxlan->gro_cells);
2884 err_free_percpu:
2885         free_percpu(dev->tstats);
2886 err_vnigroup_uninit:
2887         if (vxlan->cfg.flags & VXLAN_F_VNIFILTER)
2888                 vxlan_vnigroup_uninit(vxlan);
2889         return err;
2890 }
2891
2892 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
2893 {
2894         struct vxlan_fdb *f;
2895         u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni);
2896
2897         spin_lock_bh(&vxlan->hash_lock[hash_index]);
2898         f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
2899         if (f)
2900                 vxlan_fdb_destroy(vxlan, f, true, true);
2901         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
2902 }
2903
2904 static void vxlan_uninit(struct net_device *dev)
2905 {
2906         struct vxlan_dev *vxlan = netdev_priv(dev);
2907
2908         vxlan_mdb_fini(vxlan);
2909
2910         if (vxlan->cfg.flags & VXLAN_F_VNIFILTER)
2911                 vxlan_vnigroup_uninit(vxlan);
2912
2913         gro_cells_destroy(&vxlan->gro_cells);
2914
2915         vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
2916
2917         free_percpu(dev->tstats);
2918 }
2919
2920 /* Start ageing timer and join group when device is brought up */
2921 static int vxlan_open(struct net_device *dev)
2922 {
2923         struct vxlan_dev *vxlan = netdev_priv(dev);
2924         int ret;
2925
2926         ret = vxlan_sock_add(vxlan);
2927         if (ret < 0)
2928                 return ret;
2929
2930         ret = vxlan_multicast_join(vxlan);
2931         if (ret) {
2932                 vxlan_sock_release(vxlan);
2933                 return ret;
2934         }
2935
2936         if (vxlan->cfg.age_interval)
2937                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2938
2939         return ret;
2940 }
2941
2942 /* Purge the forwarding table */
2943 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
2944 {
2945         unsigned int h;
2946
2947         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2948                 struct hlist_node *p, *n;
2949
2950                 spin_lock_bh(&vxlan->hash_lock[h]);
2951                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2952                         struct vxlan_fdb *f
2953                                 = container_of(p, struct vxlan_fdb, hlist);
2954                         if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
2955                                 continue;
2956                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2957                         if (is_zero_ether_addr(f->eth_addr) &&
2958                             f->vni == vxlan->cfg.vni)
2959                                 continue;
2960                         vxlan_fdb_destroy(vxlan, f, true, true);
2961                 }
2962                 spin_unlock_bh(&vxlan->hash_lock[h]);
2963         }
2964 }
2965
2966 /* Cleanup timer and forwarding table on shutdown */
2967 static int vxlan_stop(struct net_device *dev)
2968 {
2969         struct vxlan_dev *vxlan = netdev_priv(dev);
2970
2971         vxlan_multicast_leave(vxlan);
2972
2973         del_timer_sync(&vxlan->age_timer);
2974
2975         vxlan_flush(vxlan, false);
2976         vxlan_sock_release(vxlan);
2977
2978         return 0;
2979 }
2980
2981 /* Stub, nothing needs to be done. */
2982 static void vxlan_set_multicast_list(struct net_device *dev)
2983 {
2984 }
2985
2986 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2987 {
2988         struct vxlan_dev *vxlan = netdev_priv(dev);
2989         struct vxlan_rdst *dst = &vxlan->default_dst;
2990         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2991                                                          dst->remote_ifindex);
2992         bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
2993
2994         /* This check is different than dev->max_mtu, because it looks at
2995          * the lowerdev->mtu, rather than the static dev->max_mtu
2996          */
2997         if (lowerdev) {
2998                 int max_mtu = lowerdev->mtu -
2999                               (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
3000                 if (new_mtu > max_mtu)
3001                         return -EINVAL;
3002         }
3003
3004         dev->mtu = new_mtu;
3005         return 0;
3006 }
3007
3008 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
3009 {
3010         struct vxlan_dev *vxlan = netdev_priv(dev);
3011         struct ip_tunnel_info *info = skb_tunnel_info(skb);
3012         __be16 sport, dport;
3013
3014         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
3015                                   vxlan->cfg.port_max, true);
3016         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
3017
3018         if (ip_tunnel_info_af(info) == AF_INET) {
3019                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
3020                 struct rtable *rt;
3021
3022                 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
3023                                      info->key.u.ipv4.dst,
3024                                      &info->key.u.ipv4.src, dport, sport,
3025                                      info->key.flow_flags, &info->dst_cache,
3026                                      info);
3027                 if (IS_ERR(rt))
3028                         return PTR_ERR(rt);
3029                 ip_rt_put(rt);
3030         } else {
3031 #if IS_ENABLED(CONFIG_IPV6)
3032                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
3033                 struct dst_entry *ndst;
3034
3035                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
3036                                         info->key.label, &info->key.u.ipv6.dst,
3037                                         &info->key.u.ipv6.src, dport, sport,
3038                                         &info->dst_cache, info);
3039                 if (IS_ERR(ndst))
3040                         return PTR_ERR(ndst);
3041                 dst_release(ndst);
3042 #else /* !CONFIG_IPV6 */
3043                 return -EPFNOSUPPORT;
3044 #endif
3045         }
3046         info->key.tp_src = sport;
3047         info->key.tp_dst = dport;
3048         return 0;
3049 }
3050
3051 static const struct net_device_ops vxlan_netdev_ether_ops = {
3052         .ndo_init               = vxlan_init,
3053         .ndo_uninit             = vxlan_uninit,
3054         .ndo_open               = vxlan_open,
3055         .ndo_stop               = vxlan_stop,
3056         .ndo_start_xmit         = vxlan_xmit,
3057         .ndo_get_stats64        = dev_get_tstats64,
3058         .ndo_set_rx_mode        = vxlan_set_multicast_list,
3059         .ndo_change_mtu         = vxlan_change_mtu,
3060         .ndo_validate_addr      = eth_validate_addr,
3061         .ndo_set_mac_address    = eth_mac_addr,
3062         .ndo_fdb_add            = vxlan_fdb_add,
3063         .ndo_fdb_del            = vxlan_fdb_delete,
3064         .ndo_fdb_dump           = vxlan_fdb_dump,
3065         .ndo_fdb_get            = vxlan_fdb_get,
3066         .ndo_mdb_add            = vxlan_mdb_add,
3067         .ndo_mdb_del            = vxlan_mdb_del,
3068         .ndo_mdb_dump           = vxlan_mdb_dump,
3069         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
3070 };
3071
3072 static const struct net_device_ops vxlan_netdev_raw_ops = {
3073         .ndo_init               = vxlan_init,
3074         .ndo_uninit             = vxlan_uninit,
3075         .ndo_open               = vxlan_open,
3076         .ndo_stop               = vxlan_stop,
3077         .ndo_start_xmit         = vxlan_xmit,
3078         .ndo_get_stats64        = dev_get_tstats64,
3079         .ndo_change_mtu         = vxlan_change_mtu,
3080         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
3081 };
3082
3083 /* Info for udev, that this is a virtual tunnel endpoint */
3084 static struct device_type vxlan_type = {
3085         .name = "vxlan",
3086 };
3087
3088 /* Calls the ndo_udp_tunnel_add of the caller in order to
3089  * supply the listening VXLAN udp ports. Callers are expected
3090  * to implement the ndo_udp_tunnel_add.
3091  */
3092 static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
3093 {
3094         struct vxlan_sock *vs;
3095         struct net *net = dev_net(dev);
3096         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3097         unsigned int i;
3098
3099         spin_lock(&vn->sock_lock);
3100         for (i = 0; i < PORT_HASH_SIZE; ++i) {
3101                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
3102                         unsigned short type;
3103
3104                         if (vs->flags & VXLAN_F_GPE)
3105                                 type = UDP_TUNNEL_TYPE_VXLAN_GPE;
3106                         else
3107                                 type = UDP_TUNNEL_TYPE_VXLAN;
3108
3109                         if (push)
3110                                 udp_tunnel_push_rx_port(dev, vs->sock, type);
3111                         else
3112                                 udp_tunnel_drop_rx_port(dev, vs->sock, type);
3113                 }
3114         }
3115         spin_unlock(&vn->sock_lock);
3116 }
3117
3118 /* Initialize the device structure. */
3119 static void vxlan_setup(struct net_device *dev)
3120 {
3121         struct vxlan_dev *vxlan = netdev_priv(dev);
3122         unsigned int h;
3123
3124         eth_hw_addr_random(dev);
3125         ether_setup(dev);
3126
3127         dev->needs_free_netdev = true;
3128         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
3129
3130         dev->features   |= NETIF_F_LLTX;
3131         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
3132         dev->features   |= NETIF_F_RXCSUM;
3133         dev->features   |= NETIF_F_GSO_SOFTWARE;
3134
3135         dev->vlan_features = dev->features;
3136         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
3137         dev->hw_features |= NETIF_F_RXCSUM;
3138         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
3139         netif_keep_dst(dev);
3140         dev->priv_flags |= IFF_NO_QUEUE | IFF_CHANGE_PROTO_DOWN;
3141
3142         /* MTU range: 68 - 65535 */
3143         dev->min_mtu = ETH_MIN_MTU;
3144         dev->max_mtu = ETH_MAX_MTU;
3145
3146         INIT_LIST_HEAD(&vxlan->next);
3147
3148         timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
3149
3150         vxlan->dev = dev;
3151
3152         for (h = 0; h < FDB_HASH_SIZE; ++h) {
3153                 spin_lock_init(&vxlan->hash_lock[h]);
3154                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
3155         }
3156 }
3157
3158 static void vxlan_ether_setup(struct net_device *dev)
3159 {
3160         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
3161         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
3162         dev->netdev_ops = &vxlan_netdev_ether_ops;
3163 }
3164
3165 static void vxlan_raw_setup(struct net_device *dev)
3166 {
3167         dev->header_ops = NULL;
3168         dev->type = ARPHRD_NONE;
3169         dev->hard_header_len = 0;
3170         dev->addr_len = 0;
3171         dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
3172         dev->netdev_ops = &vxlan_netdev_raw_ops;
3173 }
3174
3175 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
3176         [IFLA_VXLAN_UNSPEC]     = { .strict_start_type = IFLA_VXLAN_LOCALBYPASS },
3177         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
3178         [IFLA_VXLAN_GROUP]      = { .len = sizeof_field(struct iphdr, daddr) },
3179         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
3180         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
3181         [IFLA_VXLAN_LOCAL]      = { .len = sizeof_field(struct iphdr, saddr) },
3182         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
3183         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
3184         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
3185         [IFLA_VXLAN_LABEL]      = { .type = NLA_U32 },
3186         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
3187         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
3188         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
3189         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
3190         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
3191         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
3192         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
3193         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
3194         [IFLA_VXLAN_COLLECT_METADATA]   = { .type = NLA_U8 },
3195         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
3196         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
3197         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
3198         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
3199         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
3200         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
3201         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
3202         [IFLA_VXLAN_GPE]        = { .type = NLA_FLAG, },
3203         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
3204         [IFLA_VXLAN_TTL_INHERIT]        = { .type = NLA_FLAG },
3205         [IFLA_VXLAN_DF]         = { .type = NLA_U8 },
3206         [IFLA_VXLAN_VNIFILTER]  = { .type = NLA_U8 },
3207         [IFLA_VXLAN_LOCALBYPASS]        = NLA_POLICY_MAX(NLA_U8, 1),
3208 };
3209
3210 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
3211                           struct netlink_ext_ack *extack)
3212 {
3213         if (tb[IFLA_ADDRESS]) {
3214                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
3215                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3216                                             "Provided link layer address is not Ethernet");
3217                         return -EINVAL;
3218                 }
3219
3220                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
3221                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3222                                             "Provided Ethernet address is not unicast");
3223                         return -EADDRNOTAVAIL;
3224                 }
3225         }
3226
3227         if (tb[IFLA_MTU]) {
3228                 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
3229
3230                 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
3231                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
3232                                             "MTU must be between 68 and 65535");
3233                         return -EINVAL;
3234                 }
3235         }
3236
3237         if (!data) {
3238                 NL_SET_ERR_MSG(extack,
3239                                "Required attributes not provided to perform the operation");
3240                 return -EINVAL;
3241         }
3242
3243         if (data[IFLA_VXLAN_ID]) {
3244                 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
3245
3246                 if (id >= VXLAN_N_VID) {
3247                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_ID],
3248                                             "VXLAN ID must be lower than 16777216");
3249                         return -ERANGE;
3250                 }
3251         }
3252
3253         if (data[IFLA_VXLAN_PORT_RANGE]) {
3254                 const struct ifla_vxlan_port_range *p
3255                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3256
3257                 if (ntohs(p->high) < ntohs(p->low)) {
3258                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_PORT_RANGE],
3259                                             "Invalid source port range");
3260                         return -EINVAL;
3261                 }
3262         }
3263
3264         if (data[IFLA_VXLAN_DF]) {
3265                 enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]);
3266
3267                 if (df < 0 || df > VXLAN_DF_MAX) {
3268                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_DF],
3269                                             "Invalid DF attribute");
3270                         return -EINVAL;
3271                 }
3272         }
3273
3274         return 0;
3275 }
3276
3277 static void vxlan_get_drvinfo(struct net_device *netdev,
3278                               struct ethtool_drvinfo *drvinfo)
3279 {
3280         strscpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
3281         strscpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
3282 }
3283
3284 static int vxlan_get_link_ksettings(struct net_device *dev,
3285                                     struct ethtool_link_ksettings *cmd)
3286 {
3287         struct vxlan_dev *vxlan = netdev_priv(dev);
3288         struct vxlan_rdst *dst = &vxlan->default_dst;
3289         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
3290                                                          dst->remote_ifindex);
3291
3292         if (!lowerdev) {
3293                 cmd->base.duplex = DUPLEX_UNKNOWN;
3294                 cmd->base.port = PORT_OTHER;
3295                 cmd->base.speed = SPEED_UNKNOWN;
3296
3297                 return 0;
3298         }
3299
3300         return __ethtool_get_link_ksettings(lowerdev, cmd);
3301 }
3302
3303 static const struct ethtool_ops vxlan_ethtool_ops = {
3304         .get_drvinfo            = vxlan_get_drvinfo,
3305         .get_link               = ethtool_op_get_link,
3306         .get_link_ksettings     = vxlan_get_link_ksettings,
3307 };
3308
3309 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
3310                                         __be16 port, u32 flags, int ifindex)
3311 {
3312         struct socket *sock;
3313         struct udp_port_cfg udp_conf;
3314         int err;
3315
3316         memset(&udp_conf, 0, sizeof(udp_conf));
3317
3318         if (ipv6) {
3319                 udp_conf.family = AF_INET6;
3320                 udp_conf.use_udp6_rx_checksums =
3321                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
3322                 udp_conf.ipv6_v6only = 1;
3323         } else {
3324                 udp_conf.family = AF_INET;
3325         }
3326
3327         udp_conf.local_udp_port = port;
3328         udp_conf.bind_ifindex = ifindex;
3329
3330         /* Open UDP socket */
3331         err = udp_sock_create(net, &udp_conf, &sock);
3332         if (err < 0)
3333                 return ERR_PTR(err);
3334
3335         udp_allow_gso(sock->sk);
3336         return sock;
3337 }
3338
3339 /* Create new listen socket if needed */
3340 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
3341                                               __be16 port, u32 flags,
3342                                               int ifindex)
3343 {
3344         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3345         struct vxlan_sock *vs;
3346         struct socket *sock;
3347         unsigned int h;
3348         struct udp_tunnel_sock_cfg tunnel_cfg;
3349
3350         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
3351         if (!vs)
3352                 return ERR_PTR(-ENOMEM);
3353
3354         for (h = 0; h < VNI_HASH_SIZE; ++h)
3355                 INIT_HLIST_HEAD(&vs->vni_list[h]);
3356
3357         sock = vxlan_create_sock(net, ipv6, port, flags, ifindex);
3358         if (IS_ERR(sock)) {
3359                 kfree(vs);
3360                 return ERR_CAST(sock);
3361         }
3362
3363         vs->sock = sock;
3364         refcount_set(&vs->refcnt, 1);
3365         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
3366
3367         spin_lock(&vn->sock_lock);
3368         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
3369         udp_tunnel_notify_add_rx_port(sock,
3370                                       (vs->flags & VXLAN_F_GPE) ?
3371                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
3372                                       UDP_TUNNEL_TYPE_VXLAN);
3373         spin_unlock(&vn->sock_lock);
3374
3375         /* Mark socket as an encapsulation socket. */
3376         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
3377         tunnel_cfg.sk_user_data = vs;
3378         tunnel_cfg.encap_type = 1;
3379         tunnel_cfg.encap_rcv = vxlan_rcv;
3380         tunnel_cfg.encap_err_lookup = vxlan_err_lookup;
3381         tunnel_cfg.encap_destroy = NULL;
3382         tunnel_cfg.gro_receive = vxlan_gro_receive;
3383         tunnel_cfg.gro_complete = vxlan_gro_complete;
3384
3385         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
3386
3387         return vs;
3388 }
3389
3390 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
3391 {
3392         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3393         bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
3394         struct vxlan_sock *vs = NULL;
3395         struct vxlan_dev_node *node;
3396         int l3mdev_index = 0;
3397
3398         if (vxlan->cfg.remote_ifindex)
3399                 l3mdev_index = l3mdev_master_upper_ifindex_by_index(
3400                         vxlan->net, vxlan->cfg.remote_ifindex);
3401
3402         if (!vxlan->cfg.no_share) {
3403                 spin_lock(&vn->sock_lock);
3404                 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
3405                                      vxlan->cfg.dst_port, vxlan->cfg.flags,
3406                                      l3mdev_index);
3407                 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
3408                         spin_unlock(&vn->sock_lock);
3409                         return -EBUSY;
3410                 }
3411                 spin_unlock(&vn->sock_lock);
3412         }
3413         if (!vs)
3414                 vs = vxlan_socket_create(vxlan->net, ipv6,
3415                                          vxlan->cfg.dst_port, vxlan->cfg.flags,
3416                                          l3mdev_index);
3417         if (IS_ERR(vs))
3418                 return PTR_ERR(vs);
3419 #if IS_ENABLED(CONFIG_IPV6)
3420         if (ipv6) {
3421                 rcu_assign_pointer(vxlan->vn6_sock, vs);
3422                 node = &vxlan->hlist6;
3423         } else
3424 #endif
3425         {
3426                 rcu_assign_pointer(vxlan->vn4_sock, vs);
3427                 node = &vxlan->hlist4;
3428         }
3429
3430         if (metadata && (vxlan->cfg.flags & VXLAN_F_VNIFILTER))
3431                 vxlan_vs_add_vnigrp(vxlan, vs, ipv6);
3432         else
3433                 vxlan_vs_add_dev(vs, vxlan, node);
3434
3435         return 0;
3436 }
3437
3438 static int vxlan_sock_add(struct vxlan_dev *vxlan)
3439 {
3440         bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
3441         bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
3442         bool ipv4 = !ipv6 || metadata;
3443         int ret = 0;
3444
3445         RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
3446 #if IS_ENABLED(CONFIG_IPV6)
3447         RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
3448         if (ipv6) {
3449                 ret = __vxlan_sock_add(vxlan, true);
3450                 if (ret < 0 && ret != -EAFNOSUPPORT)
3451                         ipv4 = false;
3452         }
3453 #endif
3454         if (ipv4)
3455                 ret = __vxlan_sock_add(vxlan, false);
3456         if (ret < 0)
3457                 vxlan_sock_release(vxlan);
3458         return ret;
3459 }
3460
3461 int vxlan_vni_in_use(struct net *src_net, struct vxlan_dev *vxlan,
3462                      struct vxlan_config *conf, __be32 vni)
3463 {
3464         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
3465         struct vxlan_dev *tmp;
3466
3467         list_for_each_entry(tmp, &vn->vxlan_list, next) {
3468                 if (tmp == vxlan)
3469                         continue;
3470                 if (tmp->cfg.flags & VXLAN_F_VNIFILTER) {
3471                         if (!vxlan_vnifilter_lookup(tmp, vni))
3472                                 continue;
3473                 } else if (tmp->cfg.vni != vni) {
3474                         continue;
3475                 }
3476                 if (tmp->cfg.dst_port != conf->dst_port)
3477                         continue;
3478                 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3479                     (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3480                         continue;
3481
3482                 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3483                     tmp->cfg.remote_ifindex != conf->remote_ifindex)
3484                         continue;
3485
3486                 return -EEXIST;
3487         }
3488
3489         return 0;
3490 }
3491
3492 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
3493                                  struct net_device **lower,
3494                                  struct vxlan_dev *old,
3495                                  struct netlink_ext_ack *extack)
3496 {
3497         bool use_ipv6 = false;
3498
3499         if (conf->flags & VXLAN_F_GPE) {
3500                 /* For now, allow GPE only together with
3501                  * COLLECT_METADATA. This can be relaxed later; in such
3502                  * case, the other side of the PtP link will have to be
3503                  * provided.
3504                  */
3505                 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
3506                     !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3507                         NL_SET_ERR_MSG(extack,
3508                                        "VXLAN GPE does not support this combination of attributes");
3509                         return -EINVAL;
3510                 }
3511         }
3512
3513         if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
3514                 /* Unless IPv6 is explicitly requested, assume IPv4 */
3515                 conf->remote_ip.sa.sa_family = AF_INET;
3516                 conf->saddr.sa.sa_family = AF_INET;
3517         } else if (!conf->remote_ip.sa.sa_family) {
3518                 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
3519         } else if (!conf->saddr.sa.sa_family) {
3520                 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
3521         }
3522
3523         if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
3524                 NL_SET_ERR_MSG(extack,
3525                                "Local and remote address must be from the same family");
3526                 return -EINVAL;
3527         }
3528
3529         if (vxlan_addr_multicast(&conf->saddr)) {
3530                 NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
3531                 return -EINVAL;
3532         }
3533
3534         if (conf->saddr.sa.sa_family == AF_INET6) {
3535                 if (!IS_ENABLED(CONFIG_IPV6)) {
3536                         NL_SET_ERR_MSG(extack,
3537                                        "IPv6 support not enabled in the kernel");
3538                         return -EPFNOSUPPORT;
3539                 }
3540                 use_ipv6 = true;
3541                 conf->flags |= VXLAN_F_IPV6;
3542
3543                 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3544                         int local_type =
3545                                 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
3546                         int remote_type =
3547                                 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
3548
3549                         if (local_type & IPV6_ADDR_LINKLOCAL) {
3550                                 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
3551                                     (remote_type != IPV6_ADDR_ANY)) {
3552                                         NL_SET_ERR_MSG(extack,
3553                                                        "Invalid combination of local and remote address scopes");
3554                                         return -EINVAL;
3555                                 }
3556
3557                                 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
3558                         } else {
3559                                 if (remote_type ==
3560                                     (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
3561                                         NL_SET_ERR_MSG(extack,
3562                                                        "Invalid combination of local and remote address scopes");
3563                                         return -EINVAL;
3564                                 }
3565
3566                                 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
3567                         }
3568                 }
3569         }
3570
3571         if (conf->label && !use_ipv6) {
3572                 NL_SET_ERR_MSG(extack,
3573                                "Label attribute only applies to IPv6 VXLAN devices");
3574                 return -EINVAL;
3575         }
3576
3577         if (conf->remote_ifindex) {
3578                 struct net_device *lowerdev;
3579
3580                 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
3581                 if (!lowerdev) {
3582                         NL_SET_ERR_MSG(extack,
3583                                        "Invalid local interface, device not found");
3584                         return -ENODEV;
3585                 }
3586
3587 #if IS_ENABLED(CONFIG_IPV6)
3588                 if (use_ipv6) {
3589                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
3590
3591                         if (idev && idev->cnf.disable_ipv6) {
3592                                 NL_SET_ERR_MSG(extack,
3593                                                "IPv6 support disabled by administrator");
3594                                 return -EPERM;
3595                         }
3596                 }
3597 #endif
3598
3599                 *lower = lowerdev;
3600         } else {
3601                 if (vxlan_addr_multicast(&conf->remote_ip)) {
3602                         NL_SET_ERR_MSG(extack,
3603                                        "Local interface required for multicast remote destination");
3604
3605                         return -EINVAL;
3606                 }
3607
3608 #if IS_ENABLED(CONFIG_IPV6)
3609                 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
3610                         NL_SET_ERR_MSG(extack,
3611                                        "Local interface required for link-local local/remote addresses");
3612                         return -EINVAL;
3613                 }
3614 #endif
3615
3616                 *lower = NULL;
3617         }
3618
3619         if (!conf->dst_port) {
3620                 if (conf->flags & VXLAN_F_GPE)
3621                         conf->dst_port = htons(IANA_VXLAN_GPE_UDP_PORT);
3622                 else
3623                         conf->dst_port = htons(vxlan_port);
3624         }
3625
3626         if (!conf->age_interval)
3627                 conf->age_interval = FDB_AGE_DEFAULT;
3628
3629         if (vxlan_vni_in_use(src_net, old, conf, conf->vni)) {
3630                 NL_SET_ERR_MSG(extack,
3631                                "A VXLAN device with the specified VNI already exists");
3632                 return -EEXIST;
3633         }
3634
3635         return 0;
3636 }
3637
3638 static void vxlan_config_apply(struct net_device *dev,
3639                                struct vxlan_config *conf,
3640                                struct net_device *lowerdev,
3641                                struct net *src_net,
3642                                bool changelink)
3643 {
3644         struct vxlan_dev *vxlan = netdev_priv(dev);
3645         struct vxlan_rdst *dst = &vxlan->default_dst;
3646         unsigned short needed_headroom = ETH_HLEN;
3647         bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
3648         int max_mtu = ETH_MAX_MTU;
3649
3650         if (!changelink) {
3651                 if (conf->flags & VXLAN_F_GPE)
3652                         vxlan_raw_setup(dev);
3653                 else
3654                         vxlan_ether_setup(dev);
3655
3656                 if (conf->mtu)
3657                         dev->mtu = conf->mtu;
3658
3659                 vxlan->net = src_net;
3660         }
3661
3662         dst->remote_vni = conf->vni;
3663
3664         memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3665
3666         if (lowerdev) {
3667                 dst->remote_ifindex = conf->remote_ifindex;
3668
3669                 netif_inherit_tso_max(dev, lowerdev);
3670
3671                 needed_headroom = lowerdev->hard_header_len;
3672                 needed_headroom += lowerdev->needed_headroom;
3673
3674                 dev->needed_tailroom = lowerdev->needed_tailroom;
3675
3676                 max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
3677                                            VXLAN_HEADROOM);
3678                 if (max_mtu < ETH_MIN_MTU)
3679                         max_mtu = ETH_MIN_MTU;
3680
3681                 if (!changelink && !conf->mtu)
3682                         dev->mtu = max_mtu;
3683         }
3684
3685         if (dev->mtu > max_mtu)
3686                 dev->mtu = max_mtu;
3687
3688         if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
3689                 needed_headroom += VXLAN6_HEADROOM;
3690         else
3691                 needed_headroom += VXLAN_HEADROOM;
3692         dev->needed_headroom = needed_headroom;
3693
3694         memcpy(&vxlan->cfg, conf, sizeof(*conf));
3695 }
3696
3697 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3698                                struct vxlan_config *conf, bool changelink,
3699                                struct netlink_ext_ack *extack)
3700 {
3701         struct vxlan_dev *vxlan = netdev_priv(dev);
3702         struct net_device *lowerdev;
3703         int ret;
3704
3705         ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
3706         if (ret)
3707                 return ret;
3708
3709         vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3710
3711         return 0;
3712 }
3713
3714 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3715                               struct vxlan_config *conf,
3716                               struct netlink_ext_ack *extack)
3717 {
3718         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3719         struct vxlan_dev *vxlan = netdev_priv(dev);
3720         struct net_device *remote_dev = NULL;
3721         struct vxlan_fdb *f = NULL;
3722         bool unregister = false;
3723         struct vxlan_rdst *dst;
3724         int err;
3725
3726         dst = &vxlan->default_dst;
3727         err = vxlan_dev_configure(net, dev, conf, false, extack);
3728         if (err)
3729                 return err;
3730
3731         dev->ethtool_ops = &vxlan_ethtool_ops;
3732
3733         /* create an fdb entry for a valid default destination */
3734         if (!vxlan_addr_any(&dst->remote_ip)) {
3735                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3736                                        &dst->remote_ip,
3737                                        NUD_REACHABLE | NUD_PERMANENT,
3738                                        vxlan->cfg.dst_port,
3739                                        dst->remote_vni,
3740                                        dst->remote_vni,
3741                                        dst->remote_ifindex,
3742                                        NTF_SELF, 0, &f, extack);
3743                 if (err)
3744                         return err;
3745         }
3746
3747         err = register_netdevice(dev);
3748         if (err)
3749                 goto errout;
3750         unregister = true;
3751
3752         if (dst->remote_ifindex) {
3753                 remote_dev = __dev_get_by_index(net, dst->remote_ifindex);
3754                 if (!remote_dev) {
3755                         err = -ENODEV;
3756                         goto errout;
3757                 }
3758
3759                 err = netdev_upper_dev_link(remote_dev, dev, extack);
3760                 if (err)
3761                         goto errout;
3762         }
3763
3764         err = rtnl_configure_link(dev, NULL, 0, NULL);
3765         if (err < 0)
3766                 goto unlink;
3767
3768         if (f) {
3769                 vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f);
3770
3771                 /* notify default fdb entry */
3772                 err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f),
3773                                        RTM_NEWNEIGH, true, extack);
3774                 if (err) {
3775                         vxlan_fdb_destroy(vxlan, f, false, false);
3776                         if (remote_dev)
3777                                 netdev_upper_dev_unlink(remote_dev, dev);
3778                         goto unregister;
3779                 }
3780         }
3781
3782         list_add(&vxlan->next, &vn->vxlan_list);
3783         if (remote_dev)
3784                 dst->remote_dev = remote_dev;
3785         return 0;
3786 unlink:
3787         if (remote_dev)
3788                 netdev_upper_dev_unlink(remote_dev, dev);
3789 errout:
3790         /* unregister_netdevice() destroys the default FDB entry with deletion
3791          * notification. But the addition notification was not sent yet, so
3792          * destroy the entry by hand here.
3793          */
3794         if (f)
3795                 __vxlan_fdb_free(f);
3796 unregister:
3797         if (unregister)
3798                 unregister_netdevice(dev);
3799         return err;
3800 }
3801
3802 /* Set/clear flags based on attribute */
3803 static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[],
3804                           int attrtype, unsigned long mask, bool changelink,
3805                           bool changelink_supported,
3806                           struct netlink_ext_ack *extack)
3807 {
3808         unsigned long flags;
3809
3810         if (!tb[attrtype])
3811                 return 0;
3812
3813         if (changelink && !changelink_supported) {
3814                 vxlan_flag_attr_error(attrtype, extack);
3815                 return -EOPNOTSUPP;
3816         }
3817
3818         if (vxlan_policy[attrtype].type == NLA_FLAG)
3819                 flags = conf->flags | mask;
3820         else if (nla_get_u8(tb[attrtype]))
3821                 flags = conf->flags | mask;
3822         else
3823                 flags = conf->flags & ~mask;
3824
3825         conf->flags = flags;
3826
3827         return 0;
3828 }
3829
3830 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3831                          struct net_device *dev, struct vxlan_config *conf,
3832                          bool changelink, struct netlink_ext_ack *extack)
3833 {
3834         struct vxlan_dev *vxlan = netdev_priv(dev);
3835         int err = 0;
3836
3837         memset(conf, 0, sizeof(*conf));
3838
3839         /* if changelink operation, start with old existing cfg */
3840         if (changelink)
3841                 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3842
3843         if (data[IFLA_VXLAN_ID]) {
3844                 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3845
3846                 if (changelink && (vni != conf->vni)) {
3847                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI");
3848                         return -EOPNOTSUPP;
3849                 }
3850                 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3851         }
3852
3853         if (data[IFLA_VXLAN_GROUP]) {
3854                 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) {
3855                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group");
3856                         return -EOPNOTSUPP;
3857                 }
3858
3859                 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
3860                 conf->remote_ip.sa.sa_family = AF_INET;
3861         } else if (data[IFLA_VXLAN_GROUP6]) {
3862                 if (!IS_ENABLED(CONFIG_IPV6)) {
3863                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel");
3864                         return -EPFNOSUPPORT;
3865                 }
3866
3867                 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) {
3868                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group");
3869                         return -EOPNOTSUPP;
3870                 }
3871
3872                 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
3873                 conf->remote_ip.sa.sa_family = AF_INET6;
3874         }
3875
3876         if (data[IFLA_VXLAN_LOCAL]) {
3877                 if (changelink && (conf->saddr.sa.sa_family != AF_INET)) {
3878                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old");
3879                         return -EOPNOTSUPP;
3880                 }
3881
3882                 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
3883                 conf->saddr.sa.sa_family = AF_INET;
3884         } else if (data[IFLA_VXLAN_LOCAL6]) {
3885                 if (!IS_ENABLED(CONFIG_IPV6)) {
3886                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel");
3887                         return -EPFNOSUPPORT;
3888                 }
3889
3890                 if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) {
3891                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old");
3892                         return -EOPNOTSUPP;
3893                 }
3894
3895                 /* TODO: respect scope id */
3896                 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3897                 conf->saddr.sa.sa_family = AF_INET6;
3898         }
3899
3900         if (data[IFLA_VXLAN_LINK])
3901                 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3902
3903         if (data[IFLA_VXLAN_TOS])
3904                 conf->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
3905
3906         if (data[IFLA_VXLAN_TTL])
3907                 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3908
3909         if (data[IFLA_VXLAN_TTL_INHERIT]) {
3910                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT,
3911                                     VXLAN_F_TTL_INHERIT, changelink, false,
3912                                     extack);
3913                 if (err)
3914                         return err;
3915
3916         }
3917
3918         if (data[IFLA_VXLAN_LABEL])
3919                 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
3920                              IPV6_FLOWLABEL_MASK;
3921
3922         if (data[IFLA_VXLAN_LEARNING]) {
3923                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING,
3924                                     VXLAN_F_LEARN, changelink, true,
3925                                     extack);
3926                 if (err)
3927                         return err;
3928         } else if (!changelink) {
3929                 /* default to learn on a new device */
3930                 conf->flags |= VXLAN_F_LEARN;
3931         }
3932
3933         if (data[IFLA_VXLAN_AGEING])
3934                 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3935
3936         if (data[IFLA_VXLAN_PROXY]) {
3937                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY,
3938                                     VXLAN_F_PROXY, changelink, false,
3939                                     extack);
3940                 if (err)
3941                         return err;
3942         }
3943
3944         if (data[IFLA_VXLAN_RSC]) {
3945                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC,
3946                                     VXLAN_F_RSC, changelink, false,
3947                                     extack);
3948                 if (err)
3949                         return err;
3950         }
3951
3952         if (data[IFLA_VXLAN_L2MISS]) {
3953                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS,
3954                                     VXLAN_F_L2MISS, changelink, false,
3955                                     extack);
3956                 if (err)
3957                         return err;
3958         }
3959
3960         if (data[IFLA_VXLAN_L3MISS]) {
3961                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS,
3962                                     VXLAN_F_L3MISS, changelink, false,
3963                                     extack);
3964                 if (err)
3965                         return err;
3966         }
3967
3968         if (data[IFLA_VXLAN_LIMIT]) {
3969                 if (changelink) {
3970                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT],
3971                                             "Cannot change limit");
3972                         return -EOPNOTSUPP;
3973                 }
3974                 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3975         }
3976
3977         if (data[IFLA_VXLAN_COLLECT_METADATA]) {
3978                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA,
3979                                     VXLAN_F_COLLECT_METADATA, changelink, false,
3980                                     extack);
3981                 if (err)
3982                         return err;
3983         }
3984
3985         if (data[IFLA_VXLAN_PORT_RANGE]) {
3986                 if (!changelink) {
3987                         const struct ifla_vxlan_port_range *p
3988                                 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3989                         conf->port_min = ntohs(p->low);
3990                         conf->port_max = ntohs(p->high);
3991                 } else {
3992                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
3993                                             "Cannot change port range");
3994                         return -EOPNOTSUPP;
3995                 }
3996         }
3997
3998         if (data[IFLA_VXLAN_PORT]) {
3999                 if (changelink) {
4000                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT],
4001                                             "Cannot change port");
4002                         return -EOPNOTSUPP;
4003                 }
4004                 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
4005         }
4006
4007         if (data[IFLA_VXLAN_UDP_CSUM]) {
4008                 if (changelink) {
4009                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM],
4010                                             "Cannot change UDP_CSUM flag");
4011                         return -EOPNOTSUPP;
4012                 }
4013                 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
4014                         conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
4015         }
4016
4017         if (data[IFLA_VXLAN_LOCALBYPASS]) {
4018                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LOCALBYPASS,
4019                                     VXLAN_F_LOCALBYPASS, changelink,
4020                                     true, extack);
4021                 if (err)
4022                         return err;
4023         } else if (!changelink) {
4024                 /* default to local bypass on a new device */
4025                 conf->flags |= VXLAN_F_LOCALBYPASS;
4026         }
4027
4028         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
4029                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
4030                                     VXLAN_F_UDP_ZERO_CSUM6_TX, changelink,
4031                                     false, extack);
4032                 if (err)
4033                         return err;
4034         }
4035
4036         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
4037                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
4038                                     VXLAN_F_UDP_ZERO_CSUM6_RX, changelink,
4039                                     false, extack);
4040                 if (err)
4041                         return err;
4042         }
4043
4044         if (data[IFLA_VXLAN_REMCSUM_TX]) {
4045                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX,
4046                                     VXLAN_F_REMCSUM_TX, changelink, false,
4047                                     extack);
4048                 if (err)
4049                         return err;
4050         }
4051
4052         if (data[IFLA_VXLAN_REMCSUM_RX]) {
4053                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX,
4054                                     VXLAN_F_REMCSUM_RX, changelink, false,
4055                                     extack);
4056                 if (err)
4057                         return err;
4058         }
4059
4060         if (data[IFLA_VXLAN_GBP]) {
4061                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP,
4062                                     VXLAN_F_GBP, changelink, false, extack);
4063                 if (err)
4064                         return err;
4065         }
4066
4067         if (data[IFLA_VXLAN_GPE]) {
4068                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE,
4069                                     VXLAN_F_GPE, changelink, false,
4070                                     extack);
4071                 if (err)
4072                         return err;
4073         }
4074
4075         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
4076                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL,
4077                                     VXLAN_F_REMCSUM_NOPARTIAL, changelink,
4078                                     false, extack);
4079                 if (err)
4080                         return err;
4081         }
4082
4083         if (tb[IFLA_MTU]) {
4084                 if (changelink) {
4085                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
4086                                             "Cannot change mtu");
4087                         return -EOPNOTSUPP;
4088                 }
4089                 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
4090         }
4091
4092         if (data[IFLA_VXLAN_DF])
4093                 conf->df = nla_get_u8(data[IFLA_VXLAN_DF]);
4094
4095         if (data[IFLA_VXLAN_VNIFILTER]) {
4096                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_VNIFILTER,
4097                                     VXLAN_F_VNIFILTER, changelink, false,
4098                                     extack);
4099                 if (err)
4100                         return err;
4101
4102                 if ((conf->flags & VXLAN_F_VNIFILTER) &&
4103                     !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
4104                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_VNIFILTER],
4105                                             "vxlan vnifilter only valid in collect metadata mode");
4106                         return -EINVAL;
4107                 }
4108         }
4109
4110         return 0;
4111 }
4112
4113 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
4114                          struct nlattr *tb[], struct nlattr *data[],
4115                          struct netlink_ext_ack *extack)
4116 {
4117         struct vxlan_config conf;
4118         int err;
4119
4120         err = vxlan_nl2conf(tb, data, dev, &conf, false, extack);
4121         if (err)
4122                 return err;
4123
4124         return __vxlan_dev_create(src_net, dev, &conf, extack);
4125 }
4126
4127 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
4128                             struct nlattr *data[],
4129                             struct netlink_ext_ack *extack)
4130 {
4131         struct vxlan_dev *vxlan = netdev_priv(dev);
4132         struct net_device *lowerdev;
4133         struct vxlan_config conf;
4134         struct vxlan_rdst *dst;
4135         int err;
4136
4137         dst = &vxlan->default_dst;
4138         err = vxlan_nl2conf(tb, data, dev, &conf, true, extack);
4139         if (err)
4140                 return err;
4141
4142         err = vxlan_config_validate(vxlan->net, &conf, &lowerdev,
4143                                     vxlan, extack);
4144         if (err)
4145                 return err;
4146
4147         if (dst->remote_dev == lowerdev)
4148                 lowerdev = NULL;
4149
4150         err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev,
4151                                              extack);
4152         if (err)
4153                 return err;
4154
4155         /* handle default dst entry */
4156         if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) {
4157                 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni);
4158
4159                 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4160                 if (!vxlan_addr_any(&conf.remote_ip)) {
4161                         err = vxlan_fdb_update(vxlan, all_zeros_mac,
4162                                                &conf.remote_ip,
4163                                                NUD_REACHABLE | NUD_PERMANENT,
4164                                                NLM_F_APPEND | NLM_F_CREATE,
4165                                                vxlan->cfg.dst_port,
4166                                                conf.vni, conf.vni,
4167                                                conf.remote_ifindex,
4168                                                NTF_SELF, 0, true, extack);
4169                         if (err) {
4170                                 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4171                                 netdev_adjacent_change_abort(dst->remote_dev,
4172                                                              lowerdev, dev);
4173                                 return err;
4174                         }
4175                 }
4176                 if (!vxlan_addr_any(&dst->remote_ip))
4177                         __vxlan_fdb_delete(vxlan, all_zeros_mac,
4178                                            dst->remote_ip,
4179                                            vxlan->cfg.dst_port,
4180                                            dst->remote_vni,
4181                                            dst->remote_vni,
4182                                            dst->remote_ifindex,
4183                                            true);
4184                 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4185
4186                 /* If vni filtering device, also update fdb entries of
4187                  * all vnis that were using default remote ip
4188                  */
4189                 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) {
4190                         err = vxlan_vnilist_update_group(vxlan, &dst->remote_ip,
4191                                                          &conf.remote_ip, extack);
4192                         if (err) {
4193                                 netdev_adjacent_change_abort(dst->remote_dev,
4194                                                              lowerdev, dev);
4195                                 return err;
4196                         }
4197                 }
4198         }
4199
4200         if (conf.age_interval != vxlan->cfg.age_interval)
4201                 mod_timer(&vxlan->age_timer, jiffies);
4202
4203         netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev);
4204         if (lowerdev && lowerdev != dst->remote_dev)
4205                 dst->remote_dev = lowerdev;
4206         vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
4207         return 0;
4208 }
4209
4210 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
4211 {
4212         struct vxlan_dev *vxlan = netdev_priv(dev);
4213
4214         vxlan_flush(vxlan, true);
4215
4216         list_del(&vxlan->next);
4217         unregister_netdevice_queue(dev, head);
4218         if (vxlan->default_dst.remote_dev)
4219                 netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev);
4220 }
4221
4222 static size_t vxlan_get_size(const struct net_device *dev)
4223 {
4224
4225         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
4226                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
4227                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
4228                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
4229                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
4230                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL_INHERIT */
4231                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
4232                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_DF */
4233                 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
4234                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
4235                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
4236                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
4237                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
4238                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
4239                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_COLLECT_METADATA */
4240                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
4241                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
4242                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
4243                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
4244                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
4245                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
4246                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
4247                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
4248                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
4249                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LOCALBYPASS */
4250                 0;
4251 }
4252
4253 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
4254 {
4255         const struct vxlan_dev *vxlan = netdev_priv(dev);
4256         const struct vxlan_rdst *dst = &vxlan->default_dst;
4257         struct ifla_vxlan_port_range ports = {
4258                 .low =  htons(vxlan->cfg.port_min),
4259                 .high = htons(vxlan->cfg.port_max),
4260         };
4261
4262         if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
4263                 goto nla_put_failure;
4264
4265         if (!vxlan_addr_any(&dst->remote_ip)) {
4266                 if (dst->remote_ip.sa.sa_family == AF_INET) {
4267                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
4268                                             dst->remote_ip.sin.sin_addr.s_addr))
4269                                 goto nla_put_failure;
4270 #if IS_ENABLED(CONFIG_IPV6)
4271                 } else {
4272                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
4273                                              &dst->remote_ip.sin6.sin6_addr))
4274                                 goto nla_put_failure;
4275 #endif
4276                 }
4277         }
4278
4279         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
4280                 goto nla_put_failure;
4281
4282         if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
4283                 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
4284                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
4285                                             vxlan->cfg.saddr.sin.sin_addr.s_addr))
4286                                 goto nla_put_failure;
4287 #if IS_ENABLED(CONFIG_IPV6)
4288                 } else {
4289                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
4290                                              &vxlan->cfg.saddr.sin6.sin6_addr))
4291                                 goto nla_put_failure;
4292 #endif
4293                 }
4294         }
4295
4296         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
4297             nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
4298                        !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
4299             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
4300             nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) ||
4301             nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
4302             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
4303                        !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
4304             nla_put_u8(skb, IFLA_VXLAN_PROXY,
4305                        !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
4306             nla_put_u8(skb, IFLA_VXLAN_RSC,
4307                        !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
4308             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
4309                        !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
4310             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
4311                        !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
4312             nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
4313                        !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
4314             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
4315             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
4316             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
4317             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
4318                        !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
4319             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
4320                        !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
4321             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
4322                        !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
4323             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
4324                        !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
4325             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
4326                        !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)) ||
4327             nla_put_u8(skb, IFLA_VXLAN_LOCALBYPASS,
4328                        !!(vxlan->cfg.flags & VXLAN_F_LOCALBYPASS)))
4329                 goto nla_put_failure;
4330
4331         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
4332                 goto nla_put_failure;
4333
4334         if (vxlan->cfg.flags & VXLAN_F_GBP &&
4335             nla_put_flag(skb, IFLA_VXLAN_GBP))
4336                 goto nla_put_failure;
4337
4338         if (vxlan->cfg.flags & VXLAN_F_GPE &&
4339             nla_put_flag(skb, IFLA_VXLAN_GPE))
4340                 goto nla_put_failure;
4341
4342         if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
4343             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
4344                 goto nla_put_failure;
4345
4346         if (vxlan->cfg.flags & VXLAN_F_VNIFILTER &&
4347             nla_put_u8(skb, IFLA_VXLAN_VNIFILTER,
4348                        !!(vxlan->cfg.flags & VXLAN_F_VNIFILTER)))
4349                 goto nla_put_failure;
4350
4351         return 0;
4352
4353 nla_put_failure:
4354         return -EMSGSIZE;
4355 }
4356
4357 static struct net *vxlan_get_link_net(const struct net_device *dev)
4358 {
4359         struct vxlan_dev *vxlan = netdev_priv(dev);
4360
4361         return vxlan->net;
4362 }
4363
4364 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
4365         .kind           = "vxlan",
4366         .maxtype        = IFLA_VXLAN_MAX,
4367         .policy         = vxlan_policy,
4368         .priv_size      = sizeof(struct vxlan_dev),
4369         .setup          = vxlan_setup,
4370         .validate       = vxlan_validate,
4371         .newlink        = vxlan_newlink,
4372         .changelink     = vxlan_changelink,
4373         .dellink        = vxlan_dellink,
4374         .get_size       = vxlan_get_size,
4375         .fill_info      = vxlan_fill_info,
4376         .get_link_net   = vxlan_get_link_net,
4377 };
4378
4379 struct net_device *vxlan_dev_create(struct net *net, const char *name,
4380                                     u8 name_assign_type,
4381                                     struct vxlan_config *conf)
4382 {
4383         struct nlattr *tb[IFLA_MAX + 1];
4384         struct net_device *dev;
4385         int err;
4386
4387         memset(&tb, 0, sizeof(tb));
4388
4389         dev = rtnl_create_link(net, name, name_assign_type,
4390                                &vxlan_link_ops, tb, NULL);
4391         if (IS_ERR(dev))
4392                 return dev;
4393
4394         err = __vxlan_dev_create(net, dev, conf, NULL);
4395         if (err < 0) {
4396                 free_netdev(dev);
4397                 return ERR_PTR(err);
4398         }
4399
4400         err = rtnl_configure_link(dev, NULL, 0, NULL);
4401         if (err < 0) {
4402                 LIST_HEAD(list_kill);
4403
4404                 vxlan_dellink(dev, &list_kill);
4405                 unregister_netdevice_many(&list_kill);
4406                 return ERR_PTR(err);
4407         }
4408
4409         return dev;
4410 }
4411 EXPORT_SYMBOL_GPL(vxlan_dev_create);
4412
4413 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
4414                                              struct net_device *dev)
4415 {
4416         struct vxlan_dev *vxlan, *next;
4417         LIST_HEAD(list_kill);
4418
4419         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4420                 struct vxlan_rdst *dst = &vxlan->default_dst;
4421
4422                 /* In case we created vxlan device with carrier
4423                  * and we loose the carrier due to module unload
4424                  * we also need to remove vxlan device. In other
4425                  * cases, it's not necessary and remote_ifindex
4426                  * is 0 here, so no matches.
4427                  */
4428                 if (dst->remote_ifindex == dev->ifindex)
4429                         vxlan_dellink(vxlan->dev, &list_kill);
4430         }
4431
4432         unregister_netdevice_many(&list_kill);
4433 }
4434
4435 static int vxlan_netdevice_event(struct notifier_block *unused,
4436                                  unsigned long event, void *ptr)
4437 {
4438         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4439         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
4440
4441         if (event == NETDEV_UNREGISTER)
4442                 vxlan_handle_lowerdev_unregister(vn, dev);
4443         else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
4444                 vxlan_offload_rx_ports(dev, true);
4445         else if (event == NETDEV_UDP_TUNNEL_DROP_INFO)
4446                 vxlan_offload_rx_ports(dev, false);
4447
4448         return NOTIFY_DONE;
4449 }
4450
4451 static struct notifier_block vxlan_notifier_block __read_mostly = {
4452         .notifier_call = vxlan_netdevice_event,
4453 };
4454
4455 static void
4456 vxlan_fdb_offloaded_set(struct net_device *dev,
4457                         struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4458 {
4459         struct vxlan_dev *vxlan = netdev_priv(dev);
4460         struct vxlan_rdst *rdst;
4461         struct vxlan_fdb *f;
4462         u32 hash_index;
4463
4464         hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4465
4466         spin_lock_bh(&vxlan->hash_lock[hash_index]);
4467
4468         f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4469         if (!f)
4470                 goto out;
4471
4472         rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip,
4473                                    fdb_info->remote_port,
4474                                    fdb_info->remote_vni,
4475                                    fdb_info->remote_ifindex);
4476         if (!rdst)
4477                 goto out;
4478
4479         rdst->offloaded = fdb_info->offloaded;
4480
4481 out:
4482         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4483 }
4484
4485 static int
4486 vxlan_fdb_external_learn_add(struct net_device *dev,
4487                              struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4488 {
4489         struct vxlan_dev *vxlan = netdev_priv(dev);
4490         struct netlink_ext_ack *extack;
4491         u32 hash_index;
4492         int err;
4493
4494         hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4495         extack = switchdev_notifier_info_to_extack(&fdb_info->info);
4496
4497         spin_lock_bh(&vxlan->hash_lock[hash_index]);
4498         err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip,
4499                                NUD_REACHABLE,
4500                                NLM_F_CREATE | NLM_F_REPLACE,
4501                                fdb_info->remote_port,
4502                                fdb_info->vni,
4503                                fdb_info->remote_vni,
4504                                fdb_info->remote_ifindex,
4505                                NTF_USE | NTF_SELF | NTF_EXT_LEARNED,
4506                                0, false, extack);
4507         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4508
4509         return err;
4510 }
4511
4512 static int
4513 vxlan_fdb_external_learn_del(struct net_device *dev,
4514                              struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4515 {
4516         struct vxlan_dev *vxlan = netdev_priv(dev);
4517         struct vxlan_fdb *f;
4518         u32 hash_index;
4519         int err = 0;
4520
4521         hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4522         spin_lock_bh(&vxlan->hash_lock[hash_index]);
4523
4524         f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4525         if (!f)
4526                 err = -ENOENT;
4527         else if (f->flags & NTF_EXT_LEARNED)
4528                 err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr,
4529                                          fdb_info->remote_ip,
4530                                          fdb_info->remote_port,
4531                                          fdb_info->vni,
4532                                          fdb_info->remote_vni,
4533                                          fdb_info->remote_ifindex,
4534                                          false);
4535
4536         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4537
4538         return err;
4539 }
4540
4541 static int vxlan_switchdev_event(struct notifier_block *unused,
4542                                  unsigned long event, void *ptr)
4543 {
4544         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
4545         struct switchdev_notifier_vxlan_fdb_info *fdb_info;
4546         int err = 0;
4547
4548         switch (event) {
4549         case SWITCHDEV_VXLAN_FDB_OFFLOADED:
4550                 vxlan_fdb_offloaded_set(dev, ptr);
4551                 break;
4552         case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE:
4553                 fdb_info = ptr;
4554                 err = vxlan_fdb_external_learn_add(dev, fdb_info);
4555                 if (err) {
4556                         err = notifier_from_errno(err);
4557                         break;
4558                 }
4559                 fdb_info->offloaded = true;
4560                 vxlan_fdb_offloaded_set(dev, fdb_info);
4561                 break;
4562         case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE:
4563                 fdb_info = ptr;
4564                 err = vxlan_fdb_external_learn_del(dev, fdb_info);
4565                 if (err) {
4566                         err = notifier_from_errno(err);
4567                         break;
4568                 }
4569                 fdb_info->offloaded = false;
4570                 vxlan_fdb_offloaded_set(dev, fdb_info);
4571                 break;
4572         }
4573
4574         return err;
4575 }
4576
4577 static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {
4578         .notifier_call = vxlan_switchdev_event,
4579 };
4580
4581 static void vxlan_fdb_nh_flush(struct nexthop *nh)
4582 {
4583         struct vxlan_fdb *fdb;
4584         struct vxlan_dev *vxlan;
4585         u32 hash_index;
4586
4587         rcu_read_lock();
4588         list_for_each_entry_rcu(fdb, &nh->fdb_list, nh_list) {
4589                 vxlan = rcu_dereference(fdb->vdev);
4590                 WARN_ON(!vxlan);
4591                 hash_index = fdb_head_index(vxlan, fdb->eth_addr,
4592                                             vxlan->default_dst.remote_vni);
4593                 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4594                 if (!hlist_unhashed(&fdb->hlist))
4595                         vxlan_fdb_destroy(vxlan, fdb, false, false);
4596                 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4597         }
4598         rcu_read_unlock();
4599 }
4600
4601 static int vxlan_nexthop_event(struct notifier_block *nb,
4602                                unsigned long event, void *ptr)
4603 {
4604         struct nh_notifier_info *info = ptr;
4605         struct nexthop *nh;
4606
4607         if (event != NEXTHOP_EVENT_DEL)
4608                 return NOTIFY_DONE;
4609
4610         nh = nexthop_find_by_id(info->net, info->id);
4611         if (!nh)
4612                 return NOTIFY_DONE;
4613
4614         vxlan_fdb_nh_flush(nh);
4615
4616         return NOTIFY_DONE;
4617 }
4618
4619 static __net_init int vxlan_init_net(struct net *net)
4620 {
4621         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4622         unsigned int h;
4623
4624         INIT_LIST_HEAD(&vn->vxlan_list);
4625         spin_lock_init(&vn->sock_lock);
4626         vn->nexthop_notifier_block.notifier_call = vxlan_nexthop_event;
4627
4628         for (h = 0; h < PORT_HASH_SIZE; ++h)
4629                 INIT_HLIST_HEAD(&vn->sock_list[h]);
4630
4631         return register_nexthop_notifier(net, &vn->nexthop_notifier_block,
4632                                          NULL);
4633 }
4634
4635 static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
4636 {
4637         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4638         struct vxlan_dev *vxlan, *next;
4639         struct net_device *dev, *aux;
4640
4641         for_each_netdev_safe(net, dev, aux)
4642                 if (dev->rtnl_link_ops == &vxlan_link_ops)
4643                         unregister_netdevice_queue(dev, head);
4644
4645         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4646                 /* If vxlan->dev is in the same netns, it has already been added
4647                  * to the list by the previous loop.
4648                  */
4649                 if (!net_eq(dev_net(vxlan->dev), net))
4650                         unregister_netdevice_queue(vxlan->dev, head);
4651         }
4652
4653 }
4654
4655 static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
4656 {
4657         struct net *net;
4658         LIST_HEAD(list);
4659         unsigned int h;
4660
4661         list_for_each_entry(net, net_list, exit_list) {
4662                 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4663
4664                 unregister_nexthop_notifier(net, &vn->nexthop_notifier_block);
4665         }
4666         rtnl_lock();
4667         list_for_each_entry(net, net_list, exit_list)
4668                 vxlan_destroy_tunnels(net, &list);
4669
4670         unregister_netdevice_many(&list);
4671         rtnl_unlock();
4672
4673         list_for_each_entry(net, net_list, exit_list) {
4674                 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4675
4676                 for (h = 0; h < PORT_HASH_SIZE; ++h)
4677                         WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
4678         }
4679 }
4680
4681 static struct pernet_operations vxlan_net_ops = {
4682         .init = vxlan_init_net,
4683         .exit_batch = vxlan_exit_batch_net,
4684         .id   = &vxlan_net_id,
4685         .size = sizeof(struct vxlan_net),
4686 };
4687
4688 static int __init vxlan_init_module(void)
4689 {
4690         int rc;
4691
4692         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
4693
4694         rc = register_pernet_subsys(&vxlan_net_ops);
4695         if (rc)
4696                 goto out1;
4697
4698         rc = register_netdevice_notifier(&vxlan_notifier_block);
4699         if (rc)
4700                 goto out2;
4701
4702         rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block);
4703         if (rc)
4704                 goto out3;
4705
4706         rc = rtnl_link_register(&vxlan_link_ops);
4707         if (rc)
4708                 goto out4;
4709
4710         vxlan_vnifilter_init();
4711
4712         return 0;
4713 out4:
4714         unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4715 out3:
4716         unregister_netdevice_notifier(&vxlan_notifier_block);
4717 out2:
4718         unregister_pernet_subsys(&vxlan_net_ops);
4719 out1:
4720         return rc;
4721 }
4722 late_initcall(vxlan_init_module);
4723
4724 static void __exit vxlan_cleanup_module(void)
4725 {
4726         vxlan_vnifilter_uninit();
4727         rtnl_link_unregister(&vxlan_link_ops);
4728         unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4729         unregister_netdevice_notifier(&vxlan_notifier_block);
4730         unregister_pernet_subsys(&vxlan_net_ops);
4731         /* rcu_barrier() is called by netns */
4732 }
4733 module_exit(vxlan_cleanup_module);
4734
4735 MODULE_LICENSE("GPL");
4736 MODULE_VERSION(VXLAN_VERSION);
4737 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
4738 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
4739 MODULE_ALIAS_RTNL_LINK("vxlan");