drivers/net/vxlan.c

   1 /*
   2  * VXLAN: Virtual eXtensible Local Area Network
   3  *
   4  * Copyright (c) 2012-2013 Vyatta Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  12
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/errno.h>
  16 #include <linux/slab.h>
  17 #include <linux/udp.h>
  18 #include <linux/igmp.h>
  19 #include <linux/if_ether.h>
  20 #include <linux/ethtool.h>
  21 #include <net/arp.h>
  22 #include <net/ndisc.h>
  23 #include <net/ip.h>
  24 #include <net/icmp.h>
  25 #include <net/rtnetlink.h>
  26 #include <net/inet_ecn.h>
  27 #include <net/net_namespace.h>
  28 #include <net/netns/generic.h>
  29 #include <net/tun_proto.h>
  30 #include <net/vxlan.h>
  31
  32 #if IS_ENABLED(CONFIG_IPV6)
  33 #include <net/ip6_tunnel.h>
  34 #include <net/ip6_checksum.h>
  35 #endif
  36
  37 #define VXLAN_VERSION   "0.1"
  38
  39 #define PORT_HASH_BITS  8
  40 #define PORT_HASH_SIZE  (1<<PORT_HASH_BITS)
  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 static unsigned int vxlan_net_id;
  57 static struct rtnl_link_ops vxlan_link_ops;
  58
  59 static const u8 all_zeros_mac[ETH_ALEN + 2];
  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 /* per-network namespace private data for this module */
  66 struct vxlan_net {
  67         struct list_head  vxlan_list;
  68         struct hlist_head sock_list[PORT_HASH_SIZE];
  69         spinlock_t        sock_lock;
  70 };
  71
  72 /* Forwarding table entry */
  73 struct vxlan_fdb {
  74         struct hlist_node hlist;        /* linked list of entries */
  75         struct rcu_head   rcu;
  76         unsigned long     updated;      /* jiffies */
  77         unsigned long     used;
  78         struct list_head  remotes;
  79         u8                eth_addr[ETH_ALEN];
  80         u16               state;        /* see ndm_state */
  81         __be32            vni;
  82         u8                flags;        /* see ndm_flags */
  83 };
  84
  85 /* salt for hash table */
  86 static u32 vxlan_salt __read_mostly;
  87
  88 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
  89 {
  90         return vs->flags & VXLAN_F_COLLECT_METADATA ||
  91                ip_tunnel_collect_metadata();
  92 }
  93
  94 #if IS_ENABLED(CONFIG_IPV6)
  95 static inline
  96 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
  97 {
  98         if (a->sa.sa_family != b->sa.sa_family)
  99                 return false;
 100         if (a->sa.sa_family == AF_INET6)
 101                 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
 102         else
 103                 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 104 }
 105
 106 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 107 {
 108         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 109                 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
 110                 ip->sa.sa_family = AF_INET6;
 111                 return 0;
 112         } else if (nla_len(nla) >= sizeof(__be32)) {
 113                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 114                 ip->sa.sa_family = AF_INET;
 115                 return 0;
 116         } else {
 117                 return -EAFNOSUPPORT;
 118         }
 119 }
 120
 121 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 122                               const union vxlan_addr *ip)
 123 {
 124         if (ip->sa.sa_family == AF_INET6)
 125                 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
 126         else
 127                 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 128 }
 129
 130 #else /* !CONFIG_IPV6 */
 131
 132 static inline
 133 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 134 {
 135         return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 136 }
 137
 138 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 139 {
 140         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 141                 return -EAFNOSUPPORT;
 142         } else if (nla_len(nla) >= sizeof(__be32)) {
 143                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 144                 ip->sa.sa_family = AF_INET;
 145                 return 0;
 146         } else {
 147                 return -EAFNOSUPPORT;
 148         }
 149 }
 150
 151 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 152                               const union vxlan_addr *ip)
 153 {
 154         return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 155 }
 156 #endif
 157
 158 /* Virtual Network hash table head */
 159 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
 160 {
 161         return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
 162 }
 163
 164 /* Socket hash table head */
 165 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
 166 {
 167         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
 168
 169         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
 170 }
 171
 172 /* First remote destination for a forwarding entry.
 173  * Guaranteed to be non-NULL because remotes are never deleted.
 174  */
 175 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
 176 {
 177         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
 178 }
 179
 180 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
 181 {
 182         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
 183 }
 184
 185 /* Find VXLAN socket based on network namespace, address family and UDP port
 186  * and enabled unshareable flags.
 187  */
 188 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
 189                                           __be16 port, u32 flags)
 190 {
 191         struct vxlan_sock *vs;
 192
 193         flags &= VXLAN_F_RCV_FLAGS;
 194
 195         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
 196                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
 197                     vxlan_get_sk_family(vs) == family &&
 198                     vs->flags == flags)
 199                         return vs;
 200         }
 201         return NULL;
 202 }
 203
 204 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
 205                                            __be32 vni)
 206 {
 207         struct vxlan_dev_node *node;
 208
 209         /* For flow based devices, map all packets to VNI 0 */
 210         if (vs->flags & VXLAN_F_COLLECT_METADATA)
 211                 vni = 0;
 212
 213         hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
 214                 if (node->vxlan->default_dst.remote_vni != vni)
 215                         continue;
 216
 217                 if (IS_ENABLED(CONFIG_IPV6)) {
 218                         const struct vxlan_config *cfg = &node->vxlan->cfg;
 219
 220                         if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
 221                             cfg->remote_ifindex != ifindex)
 222                                 continue;
 223                 }
 224
 225                 return node->vxlan;
 226         }
 227
 228         return NULL;
 229 }
 230
 231 /* Look up VNI in a per net namespace table */
 232 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
 233                                         __be32 vni, sa_family_t family,
 234                                         __be16 port, u32 flags)
 235 {
 236         struct vxlan_sock *vs;
 237
 238         vs = vxlan_find_sock(net, family, port, flags);
 239         if (!vs)
 240                 return NULL;
 241
 242         return vxlan_vs_find_vni(vs, ifindex, vni);
 243 }
 244
 245 /* Fill in neighbour message in skbuff. */
 246 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 247                           const struct vxlan_fdb *fdb,
 248                           u32 portid, u32 seq, int type, unsigned int flags,
 249                           const struct vxlan_rdst *rdst)
 250 {
 251         unsigned long now = jiffies;
 252         struct nda_cacheinfo ci;
 253         struct nlmsghdr *nlh;
 254         struct ndmsg *ndm;
 255         bool send_ip, send_eth;
 256
 257         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 258         if (nlh == NULL)
 259                 return -EMSGSIZE;
 260
 261         ndm = nlmsg_data(nlh);
 262         memset(ndm, 0, sizeof(*ndm));
 263
 264         send_eth = send_ip = true;
 265
 266         if (type == RTM_GETNEIGH) {
 267                 send_ip = !vxlan_addr_any(&rdst->remote_ip);
 268                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
 269                 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
 270         } else
 271                 ndm->ndm_family = AF_BRIDGE;
 272         ndm->ndm_state = fdb->state;
 273         ndm->ndm_ifindex = vxlan->dev->ifindex;
 274         ndm->ndm_flags = fdb->flags;
 275         if (rdst->offloaded)
 276                 ndm->ndm_flags |= NTF_OFFLOADED;
 277         ndm->ndm_type = RTN_UNICAST;
 278
 279         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
 280             nla_put_s32(skb, NDA_LINK_NETNSID,
 281                         peernet2id(dev_net(vxlan->dev), vxlan->net)))
 282                 goto nla_put_failure;
 283
 284         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 285                 goto nla_put_failure;
 286
 287         if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
 288                 goto nla_put_failure;
 289
 290         if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
 291             nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 292                 goto nla_put_failure;
 293         if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 294             nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
 295                 goto nla_put_failure;
 296         if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
 297             nla_put_u32(skb, NDA_SRC_VNI,
 298                         be32_to_cpu(fdb->vni)))
 299                 goto nla_put_failure;
 300         if (rdst->remote_ifindex &&
 301             nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 302                 goto nla_put_failure;
 303
 304         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 305         ci.ndm_confirmed = 0;
 306         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 307         ci.ndm_refcnt    = 0;
 308
 309         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 310                 goto nla_put_failure;
 311
 312         nlmsg_end(skb, nlh);
 313         return 0;
 314
 315 nla_put_failure:
 316         nlmsg_cancel(skb, nlh);
 317         return -EMSGSIZE;
 318 }
 319
 320 static inline size_t vxlan_nlmsg_size(void)
 321 {
 322         return NLMSG_ALIGN(sizeof(struct ndmsg))
 323                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 324                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 325                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
 326                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
 327                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 328                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
 329                 + nla_total_size(sizeof(struct nda_cacheinfo));
 330 }
 331
 332 static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 333                                struct vxlan_rdst *rd, int type)
 334 {
 335         struct net *net = dev_net(vxlan->dev);
 336         struct sk_buff *skb;
 337         int err = -ENOBUFS;
 338
 339         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 340         if (skb == NULL)
 341                 goto errout;
 342
 343         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 344         if (err < 0) {
 345                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 346                 WARN_ON(err == -EMSGSIZE);
 347                 kfree_skb(skb);
 348                 goto errout;
 349         }
 350
 351         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 352         return;
 353 errout:
 354         if (err < 0)
 355                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 356 }
 357
 358 static void vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
 359                                                struct vxlan_fdb *fdb,
 360                                                struct vxlan_rdst *rd,
 361                                                bool adding)
 362 {
 363         struct switchdev_notifier_vxlan_fdb_info info;
 364         enum switchdev_notifier_type notifier_type;
 365
 366         if (WARN_ON(!rd))
 367                 return;
 368
 369         notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
 370                                : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
 371
 372         info = (struct switchdev_notifier_vxlan_fdb_info){
 373                 .remote_ip = rd->remote_ip,
 374                 .remote_port = rd->remote_port,
 375                 .remote_vni = rd->remote_vni,
 376                 .remote_ifindex = rd->remote_ifindex,
 377                 .vni = fdb->vni,
 378                 .offloaded = rd->offloaded,
 379         };
 380         memcpy(info.eth_addr, fdb->eth_addr, ETH_ALEN);
 381
 382         call_switchdev_notifiers(notifier_type, vxlan->dev,
 383                                  &info.info);
 384 }
 385
 386 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 387                              struct vxlan_rdst *rd, int type)
 388 {
 389         switch (type) {
 390         case RTM_NEWNEIGH:
 391                 vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, true);
 392                 break;
 393         case RTM_DELNEIGH:
 394                 vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, false);
 395                 break;
 396         }
 397
 398         __vxlan_fdb_notify(vxlan, fdb, rd, type);
 399 }
 400
 401 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 402 {
 403         struct vxlan_dev *vxlan = netdev_priv(dev);
 404         struct vxlan_fdb f = {
 405                 .state = NUD_STALE,
 406         };
 407         struct vxlan_rdst remote = {
 408                 .remote_ip = *ipa, /* goes to NDA_DST */
 409                 .remote_vni = cpu_to_be32(VXLAN_N_VID),
 410         };
 411
 412         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 413 }
 414
 415 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 416 {
 417         struct vxlan_fdb f = {
 418                 .state = NUD_STALE,
 419         };
 420         struct vxlan_rdst remote = { };
 421
 422         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 423
 424         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 425 }
 426
 427 /* Hash Ethernet address */
 428 static u32 eth_hash(const unsigned char *addr)
 429 {
 430         u64 value = get_unaligned((u64 *)addr);
 431
 432         /* only want 6 bytes */
 433 #ifdef __BIG_ENDIAN
 434         value >>= 16;
 435 #else
 436         value <<= 16;
 437 #endif
 438         return hash_64(value, FDB_HASH_BITS);
 439 }
 440
 441 static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
 442 {
 443         /* use 1 byte of OUI and 3 bytes of NIC */
 444         u32 key = get_unaligned((u32 *)(addr + 2));
 445
 446         return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
 447 }
 448
 449 /* Hash chain to use given mac address */
 450 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 451                                                 const u8 *mac, __be32 vni)
 452 {
 453         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
 454                 return &vxlan->fdb_head[eth_vni_hash(mac, vni)];
 455         else
 456                 return &vxlan->fdb_head[eth_hash(mac)];
 457 }
 458
 459 /* Look up Ethernet address in forwarding table */
 460 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 461                                           const u8 *mac, __be32 vni)
 462 {
 463         struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
 464         struct vxlan_fdb *f;
 465
 466         hlist_for_each_entry_rcu(f, head, hlist) {
 467                 if (ether_addr_equal(mac, f->eth_addr)) {
 468                         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
 469                                 if (vni == f->vni)
 470                                         return f;
 471                         } else {
 472                                 return f;
 473                         }
 474                 }
 475         }
 476
 477         return NULL;
 478 }
 479
 480 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 481                                         const u8 *mac, __be32 vni)
 482 {
 483         struct vxlan_fdb *f;
 484
 485         f = __vxlan_find_mac(vxlan, mac, vni);
 486         if (f && f->used != jiffies)
 487                 f->used = jiffies;
 488
 489         return f;
 490 }
 491
 492 /* caller should hold vxlan->hash_lock */
 493 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 494                                               union vxlan_addr *ip, __be16 port,
 495                                               __be32 vni, __u32 ifindex)
 496 {
 497         struct vxlan_rdst *rd;
 498
 499         list_for_each_entry(rd, &f->remotes, list) {
 500                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 501                     rd->remote_port == port &&
 502                     rd->remote_vni == vni &&
 503                     rd->remote_ifindex == ifindex)
 504                         return rd;
 505         }
 506
 507         return NULL;
 508 }
 509
 510 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
 511                       struct switchdev_notifier_vxlan_fdb_info *fdb_info)
 512 {
 513         struct vxlan_dev *vxlan = netdev_priv(dev);
 514         u8 eth_addr[ETH_ALEN + 2] = { 0 };
 515         struct vxlan_rdst *rdst;
 516         struct vxlan_fdb *f;
 517         int rc = 0;
 518
 519         if (is_multicast_ether_addr(mac) ||
 520             is_zero_ether_addr(mac))
 521                 return -EINVAL;
 522
 523         ether_addr_copy(eth_addr, mac);
 524
 525         rcu_read_lock();
 526
 527         f = __vxlan_find_mac(vxlan, eth_addr, vni);
 528         if (!f) {
 529                 rc = -ENOENT;
 530                 goto out;
 531         }
 532
 533         rdst = first_remote_rcu(f);
 534
 535         memset(fdb_info, 0, sizeof(*fdb_info));
 536         fdb_info->info.dev = dev;
 537         fdb_info->remote_ip = rdst->remote_ip;
 538         fdb_info->remote_port = rdst->remote_port;
 539         fdb_info->remote_vni = rdst->remote_vni;
 540         fdb_info->remote_ifindex = rdst->remote_ifindex;
 541         fdb_info->vni = vni;
 542         fdb_info->offloaded = rdst->offloaded;
 543         ether_addr_copy(fdb_info->eth_addr, mac);
 544
 545 out:
 546         rcu_read_unlock();
 547         return rc;
 548 }
 549 EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc);
 550
 551 /* Replace destination of unicast mac */
 552 static int vxlan_fdb_replace(struct vxlan_fdb *f,
 553                              union vxlan_addr *ip, __be16 port, __be32 vni,
 554                              __u32 ifindex)
 555 {
 556         struct vxlan_rdst *rd;
 557
 558         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 559         if (rd)
 560                 return 0;
 561
 562         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 563         if (!rd)
 564                 return 0;
 565
 566         dst_cache_reset(&rd->dst_cache);
 567         rd->remote_ip = *ip;
 568         rd->remote_port = port;
 569         rd->remote_vni = vni;
 570         rd->remote_ifindex = ifindex;
 571         rd->offloaded = false;
 572         return 1;
 573 }
 574
 575 /* Add/update destinations for multicast */
 576 static int vxlan_fdb_append(struct vxlan_fdb *f,
 577                             union vxlan_addr *ip, __be16 port, __be32 vni,
 578                             __u32 ifindex, struct vxlan_rdst **rdp)
 579 {
 580         struct vxlan_rdst *rd;
 581
 582         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 583         if (rd)
 584                 return 0;
 585
 586         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 587         if (rd == NULL)
 588                 return -ENOBUFS;
 589
 590         if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
 591                 kfree(rd);
 592                 return -ENOBUFS;
 593         }
 594
 595         rd->remote_ip = *ip;
 596         rd->remote_port = port;
 597         rd->offloaded = false;
 598         rd->remote_vni = vni;
 599         rd->remote_ifindex = ifindex;
 600
 601         list_add_tail_rcu(&rd->list, &f->remotes);
 602
 603         *rdp = rd;
 604         return 1;
 605 }
 606
 607 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
 608                                           unsigned int off,
 609                                           struct vxlanhdr *vh, size_t hdrlen,
 610                                           __be32 vni_field,
 611                                           struct gro_remcsum *grc,
 612                                           bool nopartial)
 613 {
 614         size_t start, offset;
 615
 616         if (skb->remcsum_offload)
 617                 return vh;
 618
 619         if (!NAPI_GRO_CB(skb)->csum_valid)
 620                 return NULL;
 621
 622         start = vxlan_rco_start(vni_field);
 623         offset = start + vxlan_rco_offset(vni_field);
 624
 625         vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
 626                                      start, offset, grc, nopartial);
 627
 628         skb->remcsum_offload = 1;
 629
 630         return vh;
 631 }
 632
 633 static struct sk_buff *vxlan_gro_receive(struct sock *sk,
 634                                          struct list_head *head,
 635                                          struct sk_buff *skb)
 636 {
 637         struct sk_buff *pp = NULL;
 638         struct sk_buff *p;
 639         struct vxlanhdr *vh, *vh2;
 640         unsigned int hlen, off_vx;
 641         int flush = 1;
 642         struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
 643         __be32 flags;
 644         struct gro_remcsum grc;
 645
 646         skb_gro_remcsum_init(&grc);
 647
 648         off_vx = skb_gro_offset(skb);
 649         hlen = off_vx + sizeof(*vh);
 650         vh   = skb_gro_header_fast(skb, off_vx);
 651         if (skb_gro_header_hard(skb, hlen)) {
 652                 vh = skb_gro_header_slow(skb, hlen, off_vx);
 653                 if (unlikely(!vh))
 654                         goto out;
 655         }
 656
 657         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 658
 659         flags = vh->vx_flags;
 660
 661         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
 662                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
 663                                        vh->vx_vni, &grc,
 664                                        !!(vs->flags &
 665                                           VXLAN_F_REMCSUM_NOPARTIAL));
 666
 667                 if (!vh)
 668                         goto out;
 669         }
 670
 671         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 672
 673         list_for_each_entry(p, head, list) {
 674                 if (!NAPI_GRO_CB(p)->same_flow)
 675                         continue;
 676
 677                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
 678                 if (vh->vx_flags != vh2->vx_flags ||
 679                     vh->vx_vni != vh2->vx_vni) {
 680                         NAPI_GRO_CB(p)->same_flow = 0;
 681                         continue;
 682                 }
 683         }
 684
 685         pp = call_gro_receive(eth_gro_receive, head, skb);
 686         flush = 0;
 687
 688 out:
 689         skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
 690
 691         return pp;
 692 }
 693
 694 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
 695 {
 696         /* Sets 'skb->inner_mac_header' since we are always called with
 697          * 'skb->encapsulation' set.
 698          */
 699         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 700 }
 701
 702 static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan,
 703                                          const u8 *mac, __u16 state,
 704                                          __be32 src_vni, __u8 ndm_flags)
 705 {
 706         struct vxlan_fdb *f;
 707
 708         f = kmalloc(sizeof(*f), GFP_ATOMIC);
 709         if (!f)
 710                 return NULL;
 711         f->state = state;
 712         f->flags = ndm_flags;
 713         f->updated = f->used = jiffies;
 714         f->vni = src_vni;
 715         INIT_LIST_HEAD(&f->remotes);
 716         memcpy(f->eth_addr, mac, ETH_ALEN);
 717
 718         return f;
 719 }
 720
 721 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
 722                             const u8 *mac, union vxlan_addr *ip,
 723                             __u16 state, __be16 port, __be32 src_vni,
 724                             __be32 vni, __u32 ifindex, __u8 ndm_flags,
 725                             struct vxlan_fdb **fdb)
 726 {
 727         struct vxlan_rdst *rd = NULL;
 728         struct vxlan_fdb *f;
 729         int rc;
 730
 731         if (vxlan->cfg.addrmax &&
 732             vxlan->addrcnt >= vxlan->cfg.addrmax)
 733                 return -ENOSPC;
 734
 735         netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 736         f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
 737         if (!f)
 738                 return -ENOMEM;
 739
 740         rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 741         if (rc < 0) {
 742                 kfree(f);
 743                 return rc;
 744         }
 745
 746         ++vxlan->addrcnt;
 747         hlist_add_head_rcu(&f->hlist,
 748                            vxlan_fdb_head(vxlan, mac, src_vni));
 749
 750         *fdb = f;
 751
 752         return 0;
 753 }
 754
 755 /* Add new entry to forwarding table -- assumes lock held */
 756 static int vxlan_fdb_update(struct vxlan_dev *vxlan,
 757                             const u8 *mac, union vxlan_addr *ip,
 758                             __u16 state, __u16 flags,
 759                             __be16 port, __be32 src_vni, __be32 vni,
 760                             __u32 ifindex, __u8 ndm_flags)
 761 {
 762         __u8 fdb_flags = (ndm_flags & ~NTF_USE);
 763         struct vxlan_rdst *rd = NULL;
 764         struct vxlan_fdb *f;
 765         int notify = 0;
 766         int rc;
 767
 768         f = __vxlan_find_mac(vxlan, mac, src_vni);
 769         if (f) {
 770                 if (flags & NLM_F_EXCL) {
 771                         netdev_dbg(vxlan->dev,
 772                                    "lost race to create %pM\n", mac);
 773                         return -EEXIST;
 774                 }
 775                 if (f->state != state) {
 776                         f->state = state;
 777                         f->updated = jiffies;
 778                         notify = 1;
 779                 }
 780                 if (f->flags != fdb_flags) {
 781                         f->flags = fdb_flags;
 782                         f->updated = jiffies;
 783                         notify = 1;
 784                 }
 785                 if ((flags & NLM_F_REPLACE)) {
 786                         /* Only change unicasts */
 787                         if (!(is_multicast_ether_addr(f->eth_addr) ||
 788                              is_zero_ether_addr(f->eth_addr))) {
 789                                 notify |= vxlan_fdb_replace(f, ip, port, vni,
 790                                                            ifindex);
 791                         } else
 792                                 return -EOPNOTSUPP;
 793                 }
 794                 if ((flags & NLM_F_APPEND) &&
 795                     (is_multicast_ether_addr(f->eth_addr) ||
 796                      is_zero_ether_addr(f->eth_addr))) {
 797                         rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 798
 799                         if (rc < 0)
 800                                 return rc;
 801                         notify |= rc;
 802                 }
 803
 804                 if (ndm_flags & NTF_USE)
 805                         f->used = jiffies;
 806         } else {
 807                 if (!(flags & NLM_F_CREATE))
 808                         return -ENOENT;
 809
 810                 /* Disallow replace to add a multicast entry */
 811                 if ((flags & NLM_F_REPLACE) &&
 812                     (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
 813                         return -EOPNOTSUPP;
 814
 815                 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 816                 rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
 817                                       vni, ifindex, fdb_flags, &f);
 818                 if (rc < 0)
 819                         return rc;
 820                 notify = 1;
 821         }
 822
 823         if (notify) {
 824                 if (rd == NULL)
 825                         rd = first_remote_rtnl(f);
 826                 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
 827         }
 828
 829         return 0;
 830 }
 831
 832 static void vxlan_fdb_free(struct rcu_head *head)
 833 {
 834         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 835         struct vxlan_rdst *rd, *nd;
 836
 837         list_for_each_entry_safe(rd, nd, &f->remotes, list) {
 838                 dst_cache_destroy(&rd->dst_cache);
 839                 kfree(rd);
 840         }
 841         kfree(f);
 842 }
 843
 844 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
 845                               bool do_notify)
 846 {
 847         struct vxlan_rdst *rd;
 848
 849         netdev_dbg(vxlan->dev,
 850                     "delete %pM\n", f->eth_addr);
 851
 852         --vxlan->addrcnt;
 853         if (do_notify)
 854                 list_for_each_entry(rd, &f->remotes, list)
 855                         vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
 856
 857         hlist_del_rcu(&f->hlist);
 858         call_rcu(&f->rcu, vxlan_fdb_free);
 859 }
 860
 861 static void vxlan_dst_free(struct rcu_head *head)
 862 {
 863         struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
 864
 865         dst_cache_destroy(&rd->dst_cache);
 866         kfree(rd);
 867 }
 868
 869 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
 870                                   struct vxlan_rdst *rd)
 871 {
 872         list_del_rcu(&rd->list);
 873         vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
 874         call_rcu(&rd->rcu, vxlan_dst_free);
 875 }
 876
 877 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
 878                            union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
 879                            __be32 *vni, u32 *ifindex)
 880 {
 881         struct net *net = dev_net(vxlan->dev);
 882         int err;
 883
 884         if (tb[NDA_DST]) {
 885                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
 886                 if (err)
 887                         return err;
 888         } else {
 889                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
 890                 if (remote->sa.sa_family == AF_INET) {
 891                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
 892                         ip->sa.sa_family = AF_INET;
 893 #if IS_ENABLED(CONFIG_IPV6)
 894                 } else {
 895                         ip->sin6.sin6_addr = in6addr_any;
 896                         ip->sa.sa_family = AF_INET6;
 897 #endif
 898                 }
 899         }
 900
 901         if (tb[NDA_PORT]) {
 902                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
 903                         return -EINVAL;
 904                 *port = nla_get_be16(tb[NDA_PORT]);
 905         } else {
 906                 *port = vxlan->cfg.dst_port;
 907         }
 908
 909         if (tb[NDA_VNI]) {
 910                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
 911                         return -EINVAL;
 912                 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
 913         } else {
 914                 *vni = vxlan->default_dst.remote_vni;
 915         }
 916
 917         if (tb[NDA_SRC_VNI]) {
 918                 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
 919                         return -EINVAL;
 920                 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
 921         } else {
 922                 *src_vni = vxlan->default_dst.remote_vni;
 923         }
 924
 925         if (tb[NDA_IFINDEX]) {
 926                 struct net_device *tdev;
 927
 928                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
 929                         return -EINVAL;
 930                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
 931                 tdev = __dev_get_by_index(net, *ifindex);
 932                 if (!tdev)
 933                         return -EADDRNOTAVAIL;
 934         } else {
 935                 *ifindex = 0;
 936         }
 937
 938         return 0;
 939 }
 940
 941 /* Add static entry (via netlink) */
 942 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 943                          struct net_device *dev,
 944                          const unsigned char *addr, u16 vid, u16 flags)
 945 {
 946         struct vxlan_dev *vxlan = netdev_priv(dev);
 947         /* struct net *net = dev_net(vxlan->dev); */
 948         union vxlan_addr ip;
 949         __be16 port;
 950         __be32 src_vni, vni;
 951         u32 ifindex;
 952         int err;
 953
 954         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
 955                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
 956                         ndm->ndm_state);
 957                 return -EINVAL;
 958         }
 959
 960         if (tb[NDA_DST] == NULL)
 961                 return -EINVAL;
 962
 963         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
 964         if (err)
 965                 return err;
 966
 967         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
 968                 return -EAFNOSUPPORT;
 969
 970         spin_lock_bh(&vxlan->hash_lock);
 971         err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
 972                                port, src_vni, vni, ifindex, ndm->ndm_flags);
 973         spin_unlock_bh(&vxlan->hash_lock);
 974
 975         return err;
 976 }
 977
 978 static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
 979                               const unsigned char *addr, union vxlan_addr ip,
 980                               __be16 port, __be32 src_vni, __be32 vni,
 981                               u32 ifindex, u16 vid)
 982 {
 983         struct vxlan_fdb *f;
 984         struct vxlan_rdst *rd = NULL;
 985         int err = -ENOENT;
 986
 987         f = vxlan_find_mac(vxlan, addr, src_vni);
 988         if (!f)
 989                 return err;
 990
 991         if (!vxlan_addr_any(&ip)) {
 992                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
 993                 if (!rd)
 994                         goto out;
 995         }
 996
 997         /* remove a destination if it's not the only one on the list,
 998          * otherwise destroy the fdb entry
 999          */
1000         if (rd && !list_is_singular(&f->remotes)) {
1001                 vxlan_fdb_dst_destroy(vxlan, f, rd);
1002                 goto out;
1003         }
1004
1005         vxlan_fdb_destroy(vxlan, f, true);
1006
1007 out:
1008         return 0;
1009 }
1010
1011 /* Delete entry (via netlink) */
1012 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1013                             struct net_device *dev,
1014                             const unsigned char *addr, u16 vid)
1015 {
1016         struct vxlan_dev *vxlan = netdev_priv(dev);
1017         union vxlan_addr ip;
1018         __be32 src_vni, vni;
1019         __be16 port;
1020         u32 ifindex;
1021         int err;
1022
1023         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
1024         if (err)
1025                 return err;
1026
1027         spin_lock_bh(&vxlan->hash_lock);
1028         err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
1029                                  vid);
1030         spin_unlock_bh(&vxlan->hash_lock);
1031
1032         return err;
1033 }
1034
1035 /* Dump forwarding table */
1036 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
1037                           struct net_device *dev,
1038                           struct net_device *filter_dev, int *idx)
1039 {
1040         struct vxlan_dev *vxlan = netdev_priv(dev);
1041         unsigned int h;
1042         int err = 0;
1043
1044         for (h = 0; h < FDB_HASH_SIZE; ++h) {
1045                 struct vxlan_fdb *f;
1046
1047                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
1048                         struct vxlan_rdst *rd;
1049
1050                         list_for_each_entry_rcu(rd, &f->remotes, list) {
1051                                 if (*idx < cb->args[2])
1052                                         goto skip;
1053
1054                                 err = vxlan_fdb_info(skb, vxlan, f,
1055                                                      NETLINK_CB(cb->skb).portid,
1056                                                      cb->nlh->nlmsg_seq,
1057                                                      RTM_NEWNEIGH,
1058                                                      NLM_F_MULTI, rd);
1059                                 if (err < 0)
1060                                         goto out;
1061 skip:
1062                                 *idx += 1;
1063                         }
1064                 }
1065         }
1066 out:
1067         return err;
1068 }
1069
1070 /* Watch incoming packets to learn mapping between Ethernet address
1071  * and Tunnel endpoint.
1072  * Return true if packet is bogus and should be dropped.
1073  */
1074 static bool vxlan_snoop(struct net_device *dev,
1075                         union vxlan_addr *src_ip, const u8 *src_mac,
1076                         u32 src_ifindex, __be32 vni)
1077 {
1078         struct vxlan_dev *vxlan = netdev_priv(dev);
1079         struct vxlan_fdb *f;
1080         u32 ifindex = 0;
1081
1082 #if IS_ENABLED(CONFIG_IPV6)
1083         if (src_ip->sa.sa_family == AF_INET6 &&
1084             (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
1085                 ifindex = src_ifindex;
1086 #endif
1087
1088         f = vxlan_find_mac(vxlan, src_mac, vni);
1089         if (likely(f)) {
1090                 struct vxlan_rdst *rdst = first_remote_rcu(f);
1091
1092                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
1093                            rdst->remote_ifindex == ifindex))
1094                         return false;
1095
1096                 /* Don't migrate static entries, drop packets */
1097                 if (f->state & (NUD_PERMANENT | NUD_NOARP))
1098                         return true;
1099
1100                 if (net_ratelimit())
1101                         netdev_info(dev,
1102                                     "%pM migrated from %pIS to %pIS\n",
1103                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1104
1105                 rdst->remote_ip = *src_ip;
1106                 f->updated = jiffies;
1107                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
1108         } else {
1109                 /* learned new entry */
1110                 spin_lock(&vxlan->hash_lock);
1111
1112                 /* close off race between vxlan_flush and incoming packets */
1113                 if (netif_running(dev))
1114                         vxlan_fdb_update(vxlan, src_mac, src_ip,
1115                                          NUD_REACHABLE,
1116                                          NLM_F_EXCL|NLM_F_CREATE,
1117                                          vxlan->cfg.dst_port,
1118                                          vni,
1119                                          vxlan->default_dst.remote_vni,
1120                                          ifindex, NTF_SELF);
1121                 spin_unlock(&vxlan->hash_lock);
1122         }
1123
1124         return false;
1125 }
1126
1127 /* See if multicast group is already in use by other ID */
1128 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1129 {
1130         struct vxlan_dev *vxlan;
1131         struct vxlan_sock *sock4;
1132 #if IS_ENABLED(CONFIG_IPV6)
1133         struct vxlan_sock *sock6;
1134 #endif
1135         unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1136
1137         sock4 = rtnl_dereference(dev->vn4_sock);
1138
1139         /* The vxlan_sock is only used by dev, leaving group has
1140          * no effect on other vxlan devices.
1141          */
1142         if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
1143                 return false;
1144 #if IS_ENABLED(CONFIG_IPV6)
1145         sock6 = rtnl_dereference(dev->vn6_sock);
1146         if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
1147                 return false;
1148 #endif
1149
1150         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1151                 if (!netif_running(vxlan->dev) || vxlan == dev)
1152                         continue;
1153
1154                 if (family == AF_INET &&
1155                     rtnl_dereference(vxlan->vn4_sock) != sock4)
1156                         continue;
1157 #if IS_ENABLED(CONFIG_IPV6)
1158                 if (family == AF_INET6 &&
1159                     rtnl_dereference(vxlan->vn6_sock) != sock6)
1160                         continue;
1161 #endif
1162
1163                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1164                                       &dev->default_dst.remote_ip))
1165                         continue;
1166
1167                 if (vxlan->default_dst.remote_ifindex !=
1168                     dev->default_dst.remote_ifindex)
1169                         continue;
1170
1171                 return true;
1172         }
1173
1174         return false;
1175 }
1176
1177 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1178 {
1179         struct vxlan_net *vn;
1180
1181         if (!vs)
1182                 return false;
1183         if (!refcount_dec_and_test(&vs->refcnt))
1184                 return false;
1185
1186         vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1187         spin_lock(&vn->sock_lock);
1188         hlist_del_rcu(&vs->hlist);
1189         udp_tunnel_notify_del_rx_port(vs->sock,
1190                                       (vs->flags & VXLAN_F_GPE) ?
1191                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
1192                                       UDP_TUNNEL_TYPE_VXLAN);
1193         spin_unlock(&vn->sock_lock);
1194
1195         return true;
1196 }
1197
1198 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1199 {
1200         struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1201 #if IS_ENABLED(CONFIG_IPV6)
1202         struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1203
1204         RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1205 #endif
1206
1207         RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1208         synchronize_net();
1209
1210         vxlan_vs_del_dev(vxlan);
1211
1212         if (__vxlan_sock_release_prep(sock4)) {
1213                 udp_tunnel_sock_release(sock4->sock);
1214                 kfree(sock4);
1215         }
1216
1217 #if IS_ENABLED(CONFIG_IPV6)
1218         if (__vxlan_sock_release_prep(sock6)) {
1219                 udp_tunnel_sock_release(sock6->sock);
1220                 kfree(sock6);
1221         }
1222 #endif
1223 }
1224
1225 /* Update multicast group membership when first VNI on
1226  * multicast address is brought up
1227  */
1228 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1229 {
1230         struct sock *sk;
1231         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1232         int ifindex = vxlan->default_dst.remote_ifindex;
1233         int ret = -EINVAL;
1234
1235         if (ip->sa.sa_family == AF_INET) {
1236                 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1237                 struct ip_mreqn mreq = {
1238                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1239                         .imr_ifindex            = ifindex,
1240                 };
1241
1242                 sk = sock4->sock->sk;
1243                 lock_sock(sk);
1244                 ret = ip_mc_join_group(sk, &mreq);
1245                 release_sock(sk);
1246 #if IS_ENABLED(CONFIG_IPV6)
1247         } else {
1248                 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1249
1250                 sk = sock6->sock->sk;
1251                 lock_sock(sk);
1252                 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1253                                                    &ip->sin6.sin6_addr);
1254                 release_sock(sk);
1255 #endif
1256         }
1257
1258         return ret;
1259 }
1260
1261 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1262 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1263 {
1264         struct sock *sk;
1265         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1266         int ifindex = vxlan->default_dst.remote_ifindex;
1267         int ret = -EINVAL;
1268
1269         if (ip->sa.sa_family == AF_INET) {
1270                 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1271                 struct ip_mreqn mreq = {
1272                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1273                         .imr_ifindex            = ifindex,
1274                 };
1275
1276                 sk = sock4->sock->sk;
1277                 lock_sock(sk);
1278                 ret = ip_mc_leave_group(sk, &mreq);
1279                 release_sock(sk);
1280 #if IS_ENABLED(CONFIG_IPV6)
1281         } else {
1282                 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1283
1284                 sk = sock6->sock->sk;
1285                 lock_sock(sk);
1286                 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1287                                                    &ip->sin6.sin6_addr);
1288                 release_sock(sk);
1289 #endif
1290         }
1291
1292         return ret;
1293 }
1294
1295 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1296                           struct sk_buff *skb, u32 vxflags)
1297 {
1298         size_t start, offset;
1299
1300         if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1301                 goto out;
1302
1303         start = vxlan_rco_start(unparsed->vx_vni);
1304         offset = start + vxlan_rco_offset(unparsed->vx_vni);
1305
1306         if (!pskb_may_pull(skb, offset + sizeof(u16)))
1307                 return false;
1308
1309         skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1310                             !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1311 out:
1312         unparsed->vx_flags &= ~VXLAN_HF_RCO;
1313         unparsed->vx_vni &= VXLAN_VNI_MASK;
1314         return true;
1315 }
1316
1317 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1318                                 struct sk_buff *skb, u32 vxflags,
1319                                 struct vxlan_metadata *md)
1320 {
1321         struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1322         struct metadata_dst *tun_dst;
1323
1324         if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1325                 goto out;
1326
1327         md->gbp = ntohs(gbp->policy_id);
1328
1329         tun_dst = (struct metadata_dst *)skb_dst(skb);
1330         if (tun_dst) {
1331                 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1332                 tun_dst->u.tun_info.options_len = sizeof(*md);
1333         }
1334         if (gbp->dont_learn)
1335                 md->gbp |= VXLAN_GBP_DONT_LEARN;
1336
1337         if (gbp->policy_applied)
1338                 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1339
1340         /* In flow-based mode, GBP is carried in dst_metadata */
1341         if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1342                 skb->mark = md->gbp;
1343 out:
1344         unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1345 }
1346
1347 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1348                                 __be16 *protocol,
1349                                 struct sk_buff *skb, u32 vxflags)
1350 {
1351         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1352
1353         /* Need to have Next Protocol set for interfaces in GPE mode. */
1354         if (!gpe->np_applied)
1355                 return false;
1356         /* "The initial version is 0. If a receiver does not support the
1357          * version indicated it MUST drop the packet.
1358          */
1359         if (gpe->version != 0)
1360                 return false;
1361         /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1362          * processing MUST occur." However, we don't implement OAM
1363          * processing, thus drop the packet.
1364          */
1365         if (gpe->oam_flag)
1366                 return false;
1367
1368         *protocol = tun_p_to_eth_p(gpe->next_protocol);
1369         if (!*protocol)
1370                 return false;
1371
1372         unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1373         return true;
1374 }
1375
1376 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1377                           struct vxlan_sock *vs,
1378                           struct sk_buff *skb, __be32 vni)
1379 {
1380         union vxlan_addr saddr;
1381         u32 ifindex = skb->dev->ifindex;
1382
1383         skb_reset_mac_header(skb);
1384         skb->protocol = eth_type_trans(skb, vxlan->dev);
1385         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1386
1387         /* Ignore packet loops (and multicast echo) */
1388         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1389                 return false;
1390
1391         /* Get address from the outer IP header */
1392         if (vxlan_get_sk_family(vs) == AF_INET) {
1393                 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1394                 saddr.sa.sa_family = AF_INET;
1395 #if IS_ENABLED(CONFIG_IPV6)
1396         } else {
1397                 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1398                 saddr.sa.sa_family = AF_INET6;
1399 #endif
1400         }
1401
1402         if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1403             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1404                 return false;
1405
1406         return true;
1407 }
1408
1409 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1410                                   struct sk_buff *skb)
1411 {
1412         int err = 0;
1413
1414         if (vxlan_get_sk_family(vs) == AF_INET)
1415                 err = IP_ECN_decapsulate(oiph, skb);
1416 #if IS_ENABLED(CONFIG_IPV6)
1417         else
1418                 err = IP6_ECN_decapsulate(oiph, skb);
1419 #endif
1420
1421         if (unlikely(err) && log_ecn_error) {
1422                 if (vxlan_get_sk_family(vs) == AF_INET)
1423                         net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1424                                              &((struct iphdr *)oiph)->saddr,
1425                                              ((struct iphdr *)oiph)->tos);
1426                 else
1427                         net_info_ratelimited("non-ECT from %pI6\n",
1428                                              &((struct ipv6hdr *)oiph)->saddr);
1429         }
1430         return err <= 1;
1431 }
1432
1433 /* Callback from net/ipv4/udp.c to receive packets */
1434 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1435 {
1436         struct pcpu_sw_netstats *stats;
1437         struct vxlan_dev *vxlan;
1438         struct vxlan_sock *vs;
1439         struct vxlanhdr unparsed;
1440         struct vxlan_metadata _md;
1441         struct vxlan_metadata *md = &_md;
1442         __be16 protocol = htons(ETH_P_TEB);
1443         bool raw_proto = false;
1444         void *oiph;
1445         __be32 vni = 0;
1446
1447         /* Need UDP and VXLAN header to be present */
1448         if (!pskb_may_pull(skb, VXLAN_HLEN))
1449                 goto drop;
1450
1451         unparsed = *vxlan_hdr(skb);
1452         /* VNI flag always required to be set */
1453         if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1454                 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1455                            ntohl(vxlan_hdr(skb)->vx_flags),
1456                            ntohl(vxlan_hdr(skb)->vx_vni));
1457                 /* Return non vxlan pkt */
1458                 goto drop;
1459         }
1460         unparsed.vx_flags &= ~VXLAN_HF_VNI;
1461         unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1462
1463         vs = rcu_dereference_sk_user_data(sk);
1464         if (!vs)
1465                 goto drop;
1466
1467         vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1468
1469         vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1470         if (!vxlan)
1471                 goto drop;
1472
1473         /* For backwards compatibility, only allow reserved fields to be
1474          * used by VXLAN extensions if explicitly requested.
1475          */
1476         if (vs->flags & VXLAN_F_GPE) {
1477                 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1478                         goto drop;
1479                 raw_proto = true;
1480         }
1481
1482         if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1483                                    !net_eq(vxlan->net, dev_net(vxlan->dev))))
1484                         goto drop;
1485
1486         if (vxlan_collect_metadata(vs)) {
1487                 struct metadata_dst *tun_dst;
1488
1489                 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1490                                          key32_to_tunnel_id(vni), sizeof(*md));
1491
1492                 if (!tun_dst)
1493                         goto drop;
1494
1495                 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1496
1497                 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1498         } else {
1499                 memset(md, 0, sizeof(*md));
1500         }
1501
1502         if (vs->flags & VXLAN_F_REMCSUM_RX)
1503                 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1504                         goto drop;
1505         if (vs->flags & VXLAN_F_GBP)
1506                 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1507         /* Note that GBP and GPE can never be active together. This is
1508          * ensured in vxlan_dev_configure.
1509          */
1510
1511         if (unparsed.vx_flags || unparsed.vx_vni) {
1512                 /* If there are any unprocessed flags remaining treat
1513                  * this as a malformed packet. This behavior diverges from
1514                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1515                  * in reserved fields are to be ignored. The approach here
1516                  * maintains compatibility with previous stack code, and also
1517                  * is more robust and provides a little more security in
1518                  * adding extensions to VXLAN.
1519                  */
1520                 goto drop;
1521         }
1522
1523         if (!raw_proto) {
1524                 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1525                         goto drop;
1526         } else {
1527                 skb_reset_mac_header(skb);
1528                 skb->dev = vxlan->dev;
1529                 skb->pkt_type = PACKET_HOST;
1530         }
1531
1532         oiph = skb_network_header(skb);
1533         skb_reset_network_header(skb);
1534
1535         if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1536                 ++vxlan->dev->stats.rx_frame_errors;
1537                 ++vxlan->dev->stats.rx_errors;
1538                 goto drop;
1539         }
1540
1541         stats = this_cpu_ptr(vxlan->dev->tstats);
1542         u64_stats_update_begin(&stats->syncp);
1543         stats->rx_packets++;
1544         stats->rx_bytes += skb->len;
1545         u64_stats_update_end(&stats->syncp);
1546
1547         gro_cells_receive(&vxlan->gro_cells, skb);
1548         return 0;
1549
1550 drop:
1551         /* Consume bad packet */
1552         kfree_skb(skb);
1553         return 0;
1554 }
1555
1556 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1557 {
1558         struct vxlan_dev *vxlan = netdev_priv(dev);
1559         struct arphdr *parp;
1560         u8 *arpptr, *sha;
1561         __be32 sip, tip;
1562         struct neighbour *n;
1563
1564         if (dev->flags & IFF_NOARP)
1565                 goto out;
1566
1567         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1568                 dev->stats.tx_dropped++;
1569                 goto out;
1570         }
1571         parp = arp_hdr(skb);
1572
1573         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1574              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1575             parp->ar_pro != htons(ETH_P_IP) ||
1576             parp->ar_op != htons(ARPOP_REQUEST) ||
1577             parp->ar_hln != dev->addr_len ||
1578             parp->ar_pln != 4)
1579                 goto out;
1580         arpptr = (u8 *)parp + sizeof(struct arphdr);
1581         sha = arpptr;
1582         arpptr += dev->addr_len;        /* sha */
1583         memcpy(&sip, arpptr, sizeof(sip));
1584         arpptr += sizeof(sip);
1585         arpptr += dev->addr_len;        /* tha */
1586         memcpy(&tip, arpptr, sizeof(tip));
1587
1588         if (ipv4_is_loopback(tip) ||
1589             ipv4_is_multicast(tip))
1590                 goto out;
1591
1592         n = neigh_lookup(&arp_tbl, &tip, dev);
1593
1594         if (n) {
1595                 struct vxlan_fdb *f;
1596                 struct sk_buff  *reply;
1597
1598                 if (!(n->nud_state & NUD_CONNECTED)) {
1599                         neigh_release(n);
1600                         goto out;
1601                 }
1602
1603                 f = vxlan_find_mac(vxlan, n->ha, vni);
1604                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1605                         /* bridge-local neighbor */
1606                         neigh_release(n);
1607                         goto out;
1608                 }
1609
1610                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1611                                 n->ha, sha);
1612
1613                 neigh_release(n);
1614
1615                 if (reply == NULL)
1616                         goto out;
1617
1618                 skb_reset_mac_header(reply);
1619                 __skb_pull(reply, skb_network_offset(reply));
1620                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1621                 reply->pkt_type = PACKET_HOST;
1622
1623                 if (netif_rx_ni(reply) == NET_RX_DROP)
1624                         dev->stats.rx_dropped++;
1625         } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1626                 union vxlan_addr ipa = {
1627                         .sin.sin_addr.s_addr = tip,
1628                         .sin.sin_family = AF_INET,
1629                 };
1630
1631                 vxlan_ip_miss(dev, &ipa);
1632         }
1633 out:
1634         consume_skb(skb);
1635         return NETDEV_TX_OK;
1636 }
1637
1638 #if IS_ENABLED(CONFIG_IPV6)
1639 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1640         struct neighbour *n, bool isrouter)
1641 {
1642         struct net_device *dev = request->dev;
1643         struct sk_buff *reply;
1644         struct nd_msg *ns, *na;
1645         struct ipv6hdr *pip6;
1646         u8 *daddr;
1647         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1648         int ns_olen;
1649         int i, len;
1650
1651         if (dev == NULL || !pskb_may_pull(request, request->len))
1652                 return NULL;
1653
1654         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1655                 sizeof(*na) + na_olen + dev->needed_tailroom;
1656         reply = alloc_skb(len, GFP_ATOMIC);
1657         if (reply == NULL)
1658                 return NULL;
1659
1660         reply->protocol = htons(ETH_P_IPV6);
1661         reply->dev = dev;
1662         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1663         skb_push(reply, sizeof(struct ethhdr));
1664         skb_reset_mac_header(reply);
1665
1666         ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
1667
1668         daddr = eth_hdr(request)->h_source;
1669         ns_olen = request->len - skb_network_offset(request) -
1670                 sizeof(struct ipv6hdr) - sizeof(*ns);
1671         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1672                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1673                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1674                         break;
1675                 }
1676         }
1677
1678         /* Ethernet header */
1679         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1680         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1681         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1682         reply->protocol = htons(ETH_P_IPV6);
1683
1684         skb_pull(reply, sizeof(struct ethhdr));
1685         skb_reset_network_header(reply);
1686         skb_put(reply, sizeof(struct ipv6hdr));
1687
1688         /* IPv6 header */
1689
1690         pip6 = ipv6_hdr(reply);
1691         memset(pip6, 0, sizeof(struct ipv6hdr));
1692         pip6->version = 6;
1693         pip6->priority = ipv6_hdr(request)->priority;
1694         pip6->nexthdr = IPPROTO_ICMPV6;
1695         pip6->hop_limit = 255;
1696         pip6->daddr = ipv6_hdr(request)->saddr;
1697         pip6->saddr = *(struct in6_addr *)n->primary_key;
1698
1699         skb_pull(reply, sizeof(struct ipv6hdr));
1700         skb_reset_transport_header(reply);
1701
1702         /* Neighbor Advertisement */
1703         na = skb_put_zero(reply, sizeof(*na) + na_olen);
1704         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1705         na->icmph.icmp6_router = isrouter;
1706         na->icmph.icmp6_override = 1;
1707         na->icmph.icmp6_solicited = 1;
1708         na->target = ns->target;
1709         ether_addr_copy(&na->opt[2], n->ha);
1710         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1711         na->opt[1] = na_olen >> 3;
1712
1713         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1714                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1715                 csum_partial(na, sizeof(*na)+na_olen, 0));
1716
1717         pip6->payload_len = htons(sizeof(*na)+na_olen);
1718
1719         skb_push(reply, sizeof(struct ipv6hdr));
1720
1721         reply->ip_summed = CHECKSUM_UNNECESSARY;
1722
1723         return reply;
1724 }
1725
1726 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1727 {
1728         struct vxlan_dev *vxlan = netdev_priv(dev);
1729         const struct in6_addr *daddr;
1730         const struct ipv6hdr *iphdr;
1731         struct inet6_dev *in6_dev;
1732         struct neighbour *n;
1733         struct nd_msg *msg;
1734
1735         in6_dev = __in6_dev_get(dev);
1736         if (!in6_dev)
1737                 goto out;
1738
1739         iphdr = ipv6_hdr(skb);
1740         daddr = &iphdr->daddr;
1741         msg = (struct nd_msg *)(iphdr + 1);
1742
1743         if (ipv6_addr_loopback(daddr) ||
1744             ipv6_addr_is_multicast(&msg->target))
1745                 goto out;
1746
1747         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1748
1749         if (n) {
1750                 struct vxlan_fdb *f;
1751                 struct sk_buff *reply;
1752
1753                 if (!(n->nud_state & NUD_CONNECTED)) {
1754                         neigh_release(n);
1755                         goto out;
1756                 }
1757
1758                 f = vxlan_find_mac(vxlan, n->ha, vni);
1759                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1760                         /* bridge-local neighbor */
1761                         neigh_release(n);
1762                         goto out;
1763                 }
1764
1765                 reply = vxlan_na_create(skb, n,
1766                                         !!(f ? f->flags & NTF_ROUTER : 0));
1767
1768                 neigh_release(n);
1769
1770                 if (reply == NULL)
1771                         goto out;
1772
1773                 if (netif_rx_ni(reply) == NET_RX_DROP)
1774                         dev->stats.rx_dropped++;
1775
1776         } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1777                 union vxlan_addr ipa = {
1778                         .sin6.sin6_addr = msg->target,
1779                         .sin6.sin6_family = AF_INET6,
1780                 };
1781
1782                 vxlan_ip_miss(dev, &ipa);
1783         }
1784
1785 out:
1786         consume_skb(skb);
1787         return NETDEV_TX_OK;
1788 }
1789 #endif
1790
1791 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1792 {
1793         struct vxlan_dev *vxlan = netdev_priv(dev);
1794         struct neighbour *n;
1795
1796         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1797                 return false;
1798
1799         n = NULL;
1800         switch (ntohs(eth_hdr(skb)->h_proto)) {
1801         case ETH_P_IP:
1802         {
1803                 struct iphdr *pip;
1804
1805                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1806                         return false;
1807                 pip = ip_hdr(skb);
1808                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1809                 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
1810                         union vxlan_addr ipa = {
1811                                 .sin.sin_addr.s_addr = pip->daddr,
1812                                 .sin.sin_family = AF_INET,
1813                         };
1814
1815                         vxlan_ip_miss(dev, &ipa);
1816                         return false;
1817                 }
1818
1819                 break;
1820         }
1821 #if IS_ENABLED(CONFIG_IPV6)
1822         case ETH_P_IPV6:
1823         {
1824                 struct ipv6hdr *pip6;
1825
1826                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1827                         return false;
1828                 pip6 = ipv6_hdr(skb);
1829                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1830                 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
1831                         union vxlan_addr ipa = {
1832                                 .sin6.sin6_addr = pip6->daddr,
1833                                 .sin6.sin6_family = AF_INET6,
1834                         };
1835
1836                         vxlan_ip_miss(dev, &ipa);
1837                         return false;
1838                 }
1839
1840                 break;
1841         }
1842 #endif
1843         default:
1844                 return false;
1845         }
1846
1847         if (n) {
1848                 bool diff;
1849
1850                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1851                 if (diff) {
1852                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1853                                 dev->addr_len);
1854                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1855                 }
1856                 neigh_release(n);
1857                 return diff;
1858         }
1859
1860         return false;
1861 }
1862
1863 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1864                                 struct vxlan_metadata *md)
1865 {
1866         struct vxlanhdr_gbp *gbp;
1867
1868         if (!md->gbp)
1869                 return;
1870
1871         gbp = (struct vxlanhdr_gbp *)vxh;
1872         vxh->vx_flags |= VXLAN_HF_GBP;
1873
1874         if (md->gbp & VXLAN_GBP_DONT_LEARN)
1875                 gbp->dont_learn = 1;
1876
1877         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1878                 gbp->policy_applied = 1;
1879
1880         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1881 }
1882
1883 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1884                                __be16 protocol)
1885 {
1886         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1887
1888         gpe->np_applied = 1;
1889         gpe->next_protocol = tun_p_from_eth_p(protocol);
1890         if (!gpe->next_protocol)
1891                 return -EPFNOSUPPORT;
1892         return 0;
1893 }
1894
1895 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1896                            int iphdr_len, __be32 vni,
1897                            struct vxlan_metadata *md, u32 vxflags,
1898                            bool udp_sum)
1899 {
1900         struct vxlanhdr *vxh;
1901         int min_headroom;
1902         int err;
1903         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1904         __be16 inner_protocol = htons(ETH_P_TEB);
1905
1906         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1907             skb->ip_summed == CHECKSUM_PARTIAL) {
1908                 int csum_start = skb_checksum_start_offset(skb);
1909
1910                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1911                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1912                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1913                      skb->csum_offset == offsetof(struct tcphdr, check)))
1914                         type |= SKB_GSO_TUNNEL_REMCSUM;
1915         }
1916
1917         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1918                         + VXLAN_HLEN + iphdr_len;
1919
1920         /* Need space for new headers (invalidates iph ptr) */
1921         err = skb_cow_head(skb, min_headroom);
1922         if (unlikely(err))
1923                 return err;
1924
1925         err = iptunnel_handle_offloads(skb, type);
1926         if (err)
1927                 return err;
1928
1929         vxh = __skb_push(skb, sizeof(*vxh));
1930         vxh->vx_flags = VXLAN_HF_VNI;
1931         vxh->vx_vni = vxlan_vni_field(vni);
1932
1933         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1934                 unsigned int start;
1935
1936                 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1937                 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1938                 vxh->vx_flags |= VXLAN_HF_RCO;
1939
1940                 if (!skb_is_gso(skb)) {
1941                         skb->ip_summed = CHECKSUM_NONE;
1942                         skb->encapsulation = 0;
1943                 }
1944         }
1945
1946         if (vxflags & VXLAN_F_GBP)
1947                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1948         if (vxflags & VXLAN_F_GPE) {
1949                 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1950                 if (err < 0)
1951                         return err;
1952                 inner_protocol = skb->protocol;
1953         }
1954
1955         skb_set_inner_protocol(skb, inner_protocol);
1956         return 0;
1957 }
1958
1959 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
1960                                       struct vxlan_sock *sock4,
1961                                       struct sk_buff *skb, int oif, u8 tos,
1962                                       __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
1963                                       struct dst_cache *dst_cache,
1964                                       const struct ip_tunnel_info *info)
1965 {
1966         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1967         struct rtable *rt = NULL;
1968         struct flowi4 fl4;
1969
1970         if (!sock4)
1971                 return ERR_PTR(-EIO);
1972
1973         if (tos && !info)
1974                 use_cache = false;
1975         if (use_cache) {
1976                 rt = dst_cache_get_ip4(dst_cache, saddr);
1977                 if (rt)
1978                         return rt;
1979         }
1980
1981         memset(&fl4, 0, sizeof(fl4));
1982         fl4.flowi4_oif = oif;
1983         fl4.flowi4_tos = RT_TOS(tos);
1984         fl4.flowi4_mark = skb->mark;
1985         fl4.flowi4_proto = IPPROTO_UDP;
1986         fl4.daddr = daddr;
1987         fl4.saddr = *saddr;
1988         fl4.fl4_dport = dport;
1989         fl4.fl4_sport = sport;
1990
1991         rt = ip_route_output_key(vxlan->net, &fl4);
1992         if (likely(!IS_ERR(rt))) {
1993                 if (rt->dst.dev == dev) {
1994                         netdev_dbg(dev, "circular route to %pI4\n", &daddr);
1995                         ip_rt_put(rt);
1996                         return ERR_PTR(-ELOOP);
1997                 }
1998
1999                 *saddr = fl4.saddr;
2000                 if (use_cache)
2001                         dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
2002         } else {
2003                 netdev_dbg(dev, "no route to %pI4\n", &daddr);
2004                 return ERR_PTR(-ENETUNREACH);
2005         }
2006         return rt;
2007 }
2008
2009 #if IS_ENABLED(CONFIG_IPV6)
2010 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
2011                                           struct net_device *dev,
2012                                           struct vxlan_sock *sock6,
2013                                           struct sk_buff *skb, int oif, u8 tos,
2014                                           __be32 label,
2015                                           const struct in6_addr *daddr,
2016                                           struct in6_addr *saddr,
2017                                           __be16 dport, __be16 sport,
2018                                           struct dst_cache *dst_cache,
2019                                           const struct ip_tunnel_info *info)
2020 {
2021         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2022         struct dst_entry *ndst;
2023         struct flowi6 fl6;
2024         int err;
2025
2026         if (!sock6)
2027                 return ERR_PTR(-EIO);
2028
2029         if (tos && !info)
2030                 use_cache = false;
2031         if (use_cache) {
2032                 ndst = dst_cache_get_ip6(dst_cache, saddr);
2033                 if (ndst)
2034                         return ndst;
2035         }
2036
2037         memset(&fl6, 0, sizeof(fl6));
2038         fl6.flowi6_oif = oif;
2039         fl6.daddr = *daddr;
2040         fl6.saddr = *saddr;
2041         fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
2042         fl6.flowi6_mark = skb->mark;
2043         fl6.flowi6_proto = IPPROTO_UDP;
2044         fl6.fl6_dport = dport;
2045         fl6.fl6_sport = sport;
2046
2047         err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
2048                                          sock6->sock->sk,
2049                                          &ndst, &fl6);
2050         if (unlikely(err < 0)) {
2051                 netdev_dbg(dev, "no route to %pI6\n", daddr);
2052                 return ERR_PTR(-ENETUNREACH);
2053         }
2054
2055         if (unlikely(ndst->dev == dev)) {
2056                 netdev_dbg(dev, "circular route to %pI6\n", daddr);
2057                 dst_release(ndst);
2058                 return ERR_PTR(-ELOOP);
2059         }
2060
2061         *saddr = fl6.saddr;
2062         if (use_cache)
2063                 dst_cache_set_ip6(dst_cache, ndst, saddr);
2064         return ndst;
2065 }
2066 #endif
2067
2068 /* Bypass encapsulation if the destination is local */
2069 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
2070                                struct vxlan_dev *dst_vxlan, __be32 vni)
2071 {
2072         struct pcpu_sw_netstats *tx_stats, *rx_stats;
2073         union vxlan_addr loopback;
2074         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
2075         struct net_device *dev = skb->dev;
2076         int len = skb->len;
2077
2078         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
2079         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
2080         skb->pkt_type = PACKET_HOST;
2081         skb->encapsulation = 0;
2082         skb->dev = dst_vxlan->dev;
2083         __skb_pull(skb, skb_network_offset(skb));
2084
2085         if (remote_ip->sa.sa_family == AF_INET) {
2086                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2087                 loopback.sa.sa_family =  AF_INET;
2088 #if IS_ENABLED(CONFIG_IPV6)
2089         } else {
2090                 loopback.sin6.sin6_addr = in6addr_loopback;
2091                 loopback.sa.sa_family =  AF_INET6;
2092 #endif
2093         }
2094
2095         if (dst_vxlan->cfg.flags & VXLAN_F_LEARN)
2096                 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source, 0,
2097                             vni);
2098
2099         u64_stats_update_begin(&tx_stats->syncp);
2100         tx_stats->tx_packets++;
2101         tx_stats->tx_bytes += len;
2102         u64_stats_update_end(&tx_stats->syncp);
2103
2104         if (netif_rx(skb) == NET_RX_SUCCESS) {
2105                 u64_stats_update_begin(&rx_stats->syncp);
2106                 rx_stats->rx_packets++;
2107                 rx_stats->rx_bytes += len;
2108                 u64_stats_update_end(&rx_stats->syncp);
2109         } else {
2110                 dev->stats.rx_dropped++;
2111         }
2112 }
2113
2114 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2115                                  struct vxlan_dev *vxlan,
2116                                  union vxlan_addr *daddr,
2117                                  __be16 dst_port, int dst_ifindex, __be32 vni,
2118                                  struct dst_entry *dst,
2119                                  u32 rt_flags)
2120 {
2121 #if IS_ENABLED(CONFIG_IPV6)
2122         /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2123          * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2124          * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2125          */
2126         BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2127 #endif
2128         /* Bypass encapsulation if the destination is local */
2129         if (rt_flags & RTCF_LOCAL &&
2130             !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2131                 struct vxlan_dev *dst_vxlan;
2132
2133                 dst_release(dst);
2134                 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2135                                            daddr->sa.sa_family, dst_port,
2136                                            vxlan->cfg.flags);
2137                 if (!dst_vxlan) {
2138                         dev->stats.tx_errors++;
2139                         kfree_skb(skb);
2140
2141                         return -ENOENT;
2142                 }
2143                 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni);
2144                 return 1;
2145         }
2146
2147         return 0;
2148 }
2149
2150 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2151                            __be32 default_vni, struct vxlan_rdst *rdst,
2152                            bool did_rsc)
2153 {
2154         struct dst_cache *dst_cache;
2155         struct ip_tunnel_info *info;
2156         struct vxlan_dev *vxlan = netdev_priv(dev);
2157         const struct iphdr *old_iph = ip_hdr(skb);
2158         union vxlan_addr *dst;
2159         union vxlan_addr remote_ip, local_ip;
2160         struct vxlan_metadata _md;
2161         struct vxlan_metadata *md = &_md;
2162         __be16 src_port = 0, dst_port;
2163         struct dst_entry *ndst = NULL;
2164         __be32 vni, label;
2165         __u8 tos, ttl;
2166         int ifindex;
2167         int err;
2168         u32 flags = vxlan->cfg.flags;
2169         bool udp_sum = false;
2170         bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2171
2172         info = skb_tunnel_info(skb);
2173
2174         if (rdst) {
2175                 dst = &rdst->remote_ip;
2176                 if (vxlan_addr_any(dst)) {
2177                         if (did_rsc) {
2178                                 /* short-circuited back to local bridge */
2179                                 vxlan_encap_bypass(skb, vxlan, vxlan, default_vni);
2180                                 return;
2181                         }
2182                         goto drop;
2183                 }
2184
2185                 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2186                 vni = (rdst->remote_vni) ? : default_vni;
2187                 ifindex = rdst->remote_ifindex;
2188                 local_ip = vxlan->cfg.saddr;
2189                 dst_cache = &rdst->dst_cache;
2190                 md->gbp = skb->mark;
2191                 if (flags & VXLAN_F_TTL_INHERIT) {
2192                         ttl = ip_tunnel_get_ttl(old_iph, skb);
2193                 } else {
2194                         ttl = vxlan->cfg.ttl;
2195                         if (!ttl && vxlan_addr_multicast(dst))
2196                                 ttl = 1;
2197                 }
2198
2199                 tos = vxlan->cfg.tos;
2200                 if (tos == 1)
2201                         tos = ip_tunnel_get_dsfield(old_iph, skb);
2202
2203                 if (dst->sa.sa_family == AF_INET)
2204                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2205                 else
2206                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2207                 label = vxlan->cfg.label;
2208         } else {
2209                 if (!info) {
2210                         WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2211                                   dev->name);
2212                         goto drop;
2213                 }
2214                 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2215                 if (remote_ip.sa.sa_family == AF_INET) {
2216                         remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2217                         local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2218                 } else {
2219                         remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2220                         local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2221                 }
2222                 dst = &remote_ip;
2223                 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2224                 vni = tunnel_id_to_key32(info->key.tun_id);
2225                 ifindex = 0;
2226                 dst_cache = &info->dst_cache;
2227                 if (info->options_len &&
2228                     info->key.tun_flags & TUNNEL_VXLAN_OPT)
2229                         md = ip_tunnel_info_opts(info);
2230                 ttl = info->key.ttl;
2231                 tos = info->key.tos;
2232                 label = info->key.label;
2233                 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2234         }
2235         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2236                                      vxlan->cfg.port_max, true);
2237
2238         rcu_read_lock();
2239         if (dst->sa.sa_family == AF_INET) {
2240                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2241                 struct rtable *rt;
2242                 __be16 df = 0;
2243
2244                 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2245                                      dst->sin.sin_addr.s_addr,
2246                                      &local_ip.sin.sin_addr.s_addr,
2247                                      dst_port, src_port,
2248                                      dst_cache, info);
2249                 if (IS_ERR(rt)) {
2250                         err = PTR_ERR(rt);
2251                         goto tx_error;
2252                 }
2253
2254                 /* Bypass encapsulation if the destination is local */
2255                 if (!info) {
2256                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2257                                                     dst_port, ifindex, vni,
2258                                                     &rt->dst, rt->rt_flags);
2259                         if (err)
2260                                 goto out_unlock;
2261                 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2262                         df = htons(IP_DF);
2263                 }
2264
2265                 ndst = &rt->dst;
2266                 skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM);
2267
2268                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2269                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2270                 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2271                                       vni, md, flags, udp_sum);
2272                 if (err < 0)
2273                         goto tx_error;
2274
2275                 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2276                                     dst->sin.sin_addr.s_addr, tos, ttl, df,
2277                                     src_port, dst_port, xnet, !udp_sum);
2278 #if IS_ENABLED(CONFIG_IPV6)
2279         } else {
2280                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2281
2282                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2283                                         label, &dst->sin6.sin6_addr,
2284                                         &local_ip.sin6.sin6_addr,
2285                                         dst_port, src_port,
2286                                         dst_cache, info);
2287                 if (IS_ERR(ndst)) {
2288                         err = PTR_ERR(ndst);
2289                         ndst = NULL;
2290                         goto tx_error;
2291                 }
2292
2293                 if (!info) {
2294                         u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2295
2296                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2297                                                     dst_port, ifindex, vni,
2298                                                     ndst, rt6i_flags);
2299                         if (err)
2300                                 goto out_unlock;
2301                 }
2302
2303                 skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM);
2304
2305                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2306                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2307                 skb_scrub_packet(skb, xnet);
2308                 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2309                                       vni, md, flags, udp_sum);
2310                 if (err < 0)
2311                         goto tx_error;
2312
2313                 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2314                                      &local_ip.sin6.sin6_addr,
2315                                      &dst->sin6.sin6_addr, tos, ttl,
2316                                      label, src_port, dst_port, !udp_sum);
2317 #endif
2318         }
2319 out_unlock:
2320         rcu_read_unlock();
2321         return;
2322
2323 drop:
2324         dev->stats.tx_dropped++;
2325         dev_kfree_skb(skb);
2326         return;
2327
2328 tx_error:
2329         rcu_read_unlock();
2330         if (err == -ELOOP)
2331                 dev->stats.collisions++;
2332         else if (err == -ENETUNREACH)
2333                 dev->stats.tx_carrier_errors++;
2334         dst_release(ndst);
2335         dev->stats.tx_errors++;
2336         kfree_skb(skb);
2337 }
2338
2339 /* Transmit local packets over Vxlan
2340  *
2341  * Outer IP header inherits ECN and DF from inner header.
2342  * Outer UDP destination is the VXLAN assigned port.
2343  *           source port is based on hash of flow
2344  */
2345 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2346 {
2347         struct vxlan_dev *vxlan = netdev_priv(dev);
2348         struct vxlan_rdst *rdst, *fdst = NULL;
2349         const struct ip_tunnel_info *info;
2350         bool did_rsc = false;
2351         struct vxlan_fdb *f;
2352         struct ethhdr *eth;
2353         __be32 vni = 0;
2354
2355         info = skb_tunnel_info(skb);
2356
2357         skb_reset_mac_header(skb);
2358
2359         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2360                 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2361                     info->mode & IP_TUNNEL_INFO_TX) {
2362                         vni = tunnel_id_to_key32(info->key.tun_id);
2363                 } else {
2364                         if (info && info->mode & IP_TUNNEL_INFO_TX)
2365                                 vxlan_xmit_one(skb, dev, vni, NULL, false);
2366                         else
2367                                 kfree_skb(skb);
2368                         return NETDEV_TX_OK;
2369                 }
2370         }
2371
2372         if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2373                 eth = eth_hdr(skb);
2374                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2375                         return arp_reduce(dev, skb, vni);
2376 #if IS_ENABLED(CONFIG_IPV6)
2377                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2378                          pskb_may_pull(skb, sizeof(struct ipv6hdr) +
2379                                             sizeof(struct nd_msg)) &&
2380                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2381                         struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
2382
2383                         if (m->icmph.icmp6_code == 0 &&
2384                             m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2385                                 return neigh_reduce(dev, skb, vni);
2386                 }
2387 #endif
2388         }
2389
2390         eth = eth_hdr(skb);
2391         f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2392         did_rsc = false;
2393
2394         if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2395             (ntohs(eth->h_proto) == ETH_P_IP ||
2396              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2397                 did_rsc = route_shortcircuit(dev, skb);
2398                 if (did_rsc)
2399                         f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2400         }
2401
2402         if (f == NULL) {
2403                 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2404                 if (f == NULL) {
2405                         if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2406                             !is_multicast_ether_addr(eth->h_dest))
2407                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2408
2409                         dev->stats.tx_dropped++;
2410                         kfree_skb(skb);
2411                         return NETDEV_TX_OK;
2412                 }
2413         }
2414
2415         list_for_each_entry_rcu(rdst, &f->remotes, list) {
2416                 struct sk_buff *skb1;
2417
2418                 if (!fdst) {
2419                         fdst = rdst;
2420                         continue;
2421                 }
2422                 skb1 = skb_clone(skb, GFP_ATOMIC);
2423                 if (skb1)
2424                         vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2425         }
2426
2427         if (fdst)
2428                 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2429         else
2430                 kfree_skb(skb);
2431         return NETDEV_TX_OK;
2432 }
2433
2434 /* Walk the forwarding table and purge stale entries */
2435 static void vxlan_cleanup(struct timer_list *t)
2436 {
2437         struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
2438         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2439         unsigned int h;
2440
2441         if (!netif_running(vxlan->dev))
2442                 return;
2443
2444         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2445                 struct hlist_node *p, *n;
2446
2447                 spin_lock_bh(&vxlan->hash_lock);
2448                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2449                         struct vxlan_fdb *f
2450                                 = container_of(p, struct vxlan_fdb, hlist);
2451                         unsigned long timeout;
2452
2453                         if (f->state & (NUD_PERMANENT | NUD_NOARP))
2454                                 continue;
2455
2456                         if (f->flags & NTF_EXT_LEARNED)
2457                                 continue;
2458
2459                         timeout = f->used + vxlan->cfg.age_interval * HZ;
2460                         if (time_before_eq(timeout, jiffies)) {
2461                                 netdev_dbg(vxlan->dev,
2462                                            "garbage collect %pM\n",
2463                                            f->eth_addr);
2464                                 f->state = NUD_STALE;
2465                                 vxlan_fdb_destroy(vxlan, f, true);
2466                         } else if (time_before(timeout, next_timer))
2467                                 next_timer = timeout;
2468                 }
2469                 spin_unlock_bh(&vxlan->hash_lock);
2470         }
2471
2472         mod_timer(&vxlan->age_timer, next_timer);
2473 }
2474
2475 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2476 {
2477         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2478
2479         spin_lock(&vn->sock_lock);
2480         hlist_del_init_rcu(&vxlan->hlist4.hlist);
2481 #if IS_ENABLED(CONFIG_IPV6)
2482         hlist_del_init_rcu(&vxlan->hlist6.hlist);
2483 #endif
2484         spin_unlock(&vn->sock_lock);
2485 }
2486
2487 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
2488                              struct vxlan_dev_node *node)
2489 {
2490         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2491         __be32 vni = vxlan->default_dst.remote_vni;
2492
2493         node->vxlan = vxlan;
2494         spin_lock(&vn->sock_lock);
2495         hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
2496         spin_unlock(&vn->sock_lock);
2497 }
2498
2499 /* Setup stats when device is created */
2500 static int vxlan_init(struct net_device *dev)
2501 {
2502         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2503         if (!dev->tstats)
2504                 return -ENOMEM;
2505
2506         return 0;
2507 }
2508
2509 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
2510 {
2511         struct vxlan_fdb *f;
2512
2513         spin_lock_bh(&vxlan->hash_lock);
2514         f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
2515         if (f)
2516                 vxlan_fdb_destroy(vxlan, f, true);
2517         spin_unlock_bh(&vxlan->hash_lock);
2518 }
2519
2520 static void vxlan_uninit(struct net_device *dev)
2521 {
2522         struct vxlan_dev *vxlan = netdev_priv(dev);
2523
2524         vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
2525
2526         free_percpu(dev->tstats);
2527 }
2528
2529 /* Start ageing timer and join group when device is brought up */
2530 static int vxlan_open(struct net_device *dev)
2531 {
2532         struct vxlan_dev *vxlan = netdev_priv(dev);
2533         int ret;
2534
2535         ret = vxlan_sock_add(vxlan);
2536         if (ret < 0)
2537                 return ret;
2538
2539         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2540                 ret = vxlan_igmp_join(vxlan);
2541                 if (ret == -EADDRINUSE)
2542                         ret = 0;
2543                 if (ret) {
2544                         vxlan_sock_release(vxlan);
2545                         return ret;
2546                 }
2547         }
2548
2549         if (vxlan->cfg.age_interval)
2550                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2551
2552         return ret;
2553 }
2554
2555 /* Purge the forwarding table */
2556 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
2557 {
2558         unsigned int h;
2559
2560         spin_lock_bh(&vxlan->hash_lock);
2561         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2562                 struct hlist_node *p, *n;
2563                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2564                         struct vxlan_fdb *f
2565                                 = container_of(p, struct vxlan_fdb, hlist);
2566                         if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
2567                                 continue;
2568                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2569                         if (!is_zero_ether_addr(f->eth_addr))
2570                                 vxlan_fdb_destroy(vxlan, f, true);
2571                 }
2572         }
2573         spin_unlock_bh(&vxlan->hash_lock);
2574 }
2575
2576 /* Cleanup timer and forwarding table on shutdown */
2577 static int vxlan_stop(struct net_device *dev)
2578 {
2579         struct vxlan_dev *vxlan = netdev_priv(dev);
2580         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2581         int ret = 0;
2582
2583         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2584             !vxlan_group_used(vn, vxlan))
2585                 ret = vxlan_igmp_leave(vxlan);
2586
2587         del_timer_sync(&vxlan->age_timer);
2588
2589         vxlan_flush(vxlan, false);
2590         vxlan_sock_release(vxlan);
2591
2592         return ret;
2593 }
2594
2595 /* Stub, nothing needs to be done. */
2596 static void vxlan_set_multicast_list(struct net_device *dev)
2597 {
2598 }
2599
2600 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2601 {
2602         struct vxlan_dev *vxlan = netdev_priv(dev);
2603         struct vxlan_rdst *dst = &vxlan->default_dst;
2604         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2605                                                          dst->remote_ifindex);
2606         bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
2607
2608         /* This check is different than dev->max_mtu, because it looks at
2609          * the lowerdev->mtu, rather than the static dev->max_mtu
2610          */
2611         if (lowerdev) {
2612                 int max_mtu = lowerdev->mtu -
2613                               (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2614                 if (new_mtu > max_mtu)
2615                         return -EINVAL;
2616         }
2617
2618         dev->mtu = new_mtu;
2619         return 0;
2620 }
2621
2622 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2623 {
2624         struct vxlan_dev *vxlan = netdev_priv(dev);
2625         struct ip_tunnel_info *info = skb_tunnel_info(skb);
2626         __be16 sport, dport;
2627
2628         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2629                                   vxlan->cfg.port_max, true);
2630         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2631
2632         if (ip_tunnel_info_af(info) == AF_INET) {
2633                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2634                 struct rtable *rt;
2635
2636                 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
2637                                      info->key.u.ipv4.dst,
2638                                      &info->key.u.ipv4.src, dport, sport,
2639                                      &info->dst_cache, info);
2640                 if (IS_ERR(rt))
2641                         return PTR_ERR(rt);
2642                 ip_rt_put(rt);
2643         } else {
2644 #if IS_ENABLED(CONFIG_IPV6)
2645                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2646                 struct dst_entry *ndst;
2647
2648                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
2649                                         info->key.label, &info->key.u.ipv6.dst,
2650                                         &info->key.u.ipv6.src, dport, sport,
2651                                         &info->dst_cache, info);
2652                 if (IS_ERR(ndst))
2653                         return PTR_ERR(ndst);
2654                 dst_release(ndst);
2655 #else /* !CONFIG_IPV6 */
2656                 return -EPFNOSUPPORT;
2657 #endif
2658         }
2659         info->key.tp_src = sport;
2660         info->key.tp_dst = dport;
2661         return 0;
2662 }
2663
2664 static const struct net_device_ops vxlan_netdev_ether_ops = {
2665         .ndo_init               = vxlan_init,
2666         .ndo_uninit             = vxlan_uninit,
2667         .ndo_open               = vxlan_open,
2668         .ndo_stop               = vxlan_stop,
2669         .ndo_start_xmit         = vxlan_xmit,
2670         .ndo_get_stats64        = ip_tunnel_get_stats64,
2671         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2672         .ndo_change_mtu         = vxlan_change_mtu,
2673         .ndo_validate_addr      = eth_validate_addr,
2674         .ndo_set_mac_address    = eth_mac_addr,
2675         .ndo_fdb_add            = vxlan_fdb_add,
2676         .ndo_fdb_del            = vxlan_fdb_delete,
2677         .ndo_fdb_dump           = vxlan_fdb_dump,
2678         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2679 };
2680
2681 static const struct net_device_ops vxlan_netdev_raw_ops = {
2682         .ndo_init               = vxlan_init,
2683         .ndo_uninit             = vxlan_uninit,
2684         .ndo_open               = vxlan_open,
2685         .ndo_stop               = vxlan_stop,
2686         .ndo_start_xmit         = vxlan_xmit,
2687         .ndo_get_stats64        = ip_tunnel_get_stats64,
2688         .ndo_change_mtu         = vxlan_change_mtu,
2689         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2690 };
2691
2692 /* Info for udev, that this is a virtual tunnel endpoint */
2693 static struct device_type vxlan_type = {
2694         .name = "vxlan",
2695 };
2696
2697 /* Calls the ndo_udp_tunnel_add of the caller in order to
2698  * supply the listening VXLAN udp ports. Callers are expected
2699  * to implement the ndo_udp_tunnel_add.
2700  */
2701 static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
2702 {
2703         struct vxlan_sock *vs;
2704         struct net *net = dev_net(dev);
2705         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2706         unsigned int i;
2707
2708         spin_lock(&vn->sock_lock);
2709         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2710                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2711                         unsigned short type;
2712
2713                         if (vs->flags & VXLAN_F_GPE)
2714                                 type = UDP_TUNNEL_TYPE_VXLAN_GPE;
2715                         else
2716                                 type = UDP_TUNNEL_TYPE_VXLAN;
2717
2718                         if (push)
2719                                 udp_tunnel_push_rx_port(dev, vs->sock, type);
2720                         else
2721                                 udp_tunnel_drop_rx_port(dev, vs->sock, type);
2722                 }
2723         }
2724         spin_unlock(&vn->sock_lock);
2725 }
2726
2727 /* Initialize the device structure. */
2728 static void vxlan_setup(struct net_device *dev)
2729 {
2730         struct vxlan_dev *vxlan = netdev_priv(dev);
2731         unsigned int h;
2732
2733         eth_hw_addr_random(dev);
2734         ether_setup(dev);
2735
2736         dev->needs_free_netdev = true;
2737         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2738
2739         dev->features   |= NETIF_F_LLTX;
2740         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2741         dev->features   |= NETIF_F_RXCSUM;
2742         dev->features   |= NETIF_F_GSO_SOFTWARE;
2743
2744         dev->vlan_features = dev->features;
2745         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2746         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2747         netif_keep_dst(dev);
2748         dev->priv_flags |= IFF_NO_QUEUE;
2749
2750         /* MTU range: 68 - 65535 */
2751         dev->min_mtu = ETH_MIN_MTU;
2752         dev->max_mtu = ETH_MAX_MTU;
2753
2754         INIT_LIST_HEAD(&vxlan->next);
2755         spin_lock_init(&vxlan->hash_lock);
2756
2757         timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
2758
2759         vxlan->dev = dev;
2760
2761         gro_cells_init(&vxlan->gro_cells, dev);
2762
2763         for (h = 0; h < FDB_HASH_SIZE; ++h)
2764                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2765 }
2766
2767 static void vxlan_ether_setup(struct net_device *dev)
2768 {
2769         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2770         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2771         dev->netdev_ops = &vxlan_netdev_ether_ops;
2772 }
2773
2774 static void vxlan_raw_setup(struct net_device *dev)
2775 {
2776         dev->header_ops = NULL;
2777         dev->type = ARPHRD_NONE;
2778         dev->hard_header_len = 0;
2779         dev->addr_len = 0;
2780         dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2781         dev->netdev_ops = &vxlan_netdev_raw_ops;
2782 }
2783
2784 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2785         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2786         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2787         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2788         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2789         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2790         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2791         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2792         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2793         [IFLA_VXLAN_LABEL]      = { .type = NLA_U32 },
2794         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2795         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2796         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2797         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2798         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2799         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2800         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2801         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2802         [IFLA_VXLAN_COLLECT_METADATA]   = { .type = NLA_U8 },
2803         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2804         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
2805         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
2806         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
2807         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2808         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2809         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
2810         [IFLA_VXLAN_GPE]        = { .type = NLA_FLAG, },
2811         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
2812         [IFLA_VXLAN_TTL_INHERIT]        = { .type = NLA_FLAG },
2813 };
2814
2815 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
2816                           struct netlink_ext_ack *extack)
2817 {
2818         if (tb[IFLA_ADDRESS]) {
2819                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2820                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
2821                                             "Provided link layer address is not Ethernet");
2822                         return -EINVAL;
2823                 }
2824
2825                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2826                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
2827                                             "Provided Ethernet address is not unicast");
2828                         return -EADDRNOTAVAIL;
2829                 }
2830         }
2831
2832         if (tb[IFLA_MTU]) {
2833                 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
2834
2835                 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
2836                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
2837                                             "MTU must be between 68 and 65535");
2838                         return -EINVAL;
2839                 }
2840         }
2841
2842         if (!data) {
2843                 NL_SET_ERR_MSG(extack,
2844                                "Required attributes not provided to perform the operation");
2845                 return -EINVAL;
2846         }
2847
2848         if (data[IFLA_VXLAN_ID]) {
2849                 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2850
2851                 if (id >= VXLAN_N_VID) {
2852                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID],
2853                                             "VXLAN ID must be lower than 16777216");
2854                         return -ERANGE;
2855                 }
2856         }
2857
2858         if (data[IFLA_VXLAN_PORT_RANGE]) {
2859                 const struct ifla_vxlan_port_range *p
2860                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2861
2862                 if (ntohs(p->high) < ntohs(p->low)) {
2863                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
2864                                             "Invalid source port range");
2865                         return -EINVAL;
2866                 }
2867         }
2868
2869         return 0;
2870 }
2871
2872 static void vxlan_get_drvinfo(struct net_device *netdev,
2873                               struct ethtool_drvinfo *drvinfo)
2874 {
2875         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2876         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2877 }
2878
2879 static const struct ethtool_ops vxlan_ethtool_ops = {
2880         .get_drvinfo    = vxlan_get_drvinfo,
2881         .get_link       = ethtool_op_get_link,
2882 };
2883
2884 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2885                                         __be16 port, u32 flags)
2886 {
2887         struct socket *sock;
2888         struct udp_port_cfg udp_conf;
2889         int err;
2890
2891         memset(&udp_conf, 0, sizeof(udp_conf));
2892
2893         if (ipv6) {
2894                 udp_conf.family = AF_INET6;
2895                 udp_conf.use_udp6_rx_checksums =
2896                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2897                 udp_conf.ipv6_v6only = 1;
2898         } else {
2899                 udp_conf.family = AF_INET;
2900         }
2901
2902         udp_conf.local_udp_port = port;
2903
2904         /* Open UDP socket */
2905         err = udp_sock_create(net, &udp_conf, &sock);
2906         if (err < 0)
2907                 return ERR_PTR(err);
2908
2909         return sock;
2910 }
2911
2912 /* Create new listen socket if needed */
2913 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2914                                               __be16 port, u32 flags)
2915 {
2916         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2917         struct vxlan_sock *vs;
2918         struct socket *sock;
2919         unsigned int h;
2920         struct udp_tunnel_sock_cfg tunnel_cfg;
2921
2922         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2923         if (!vs)
2924                 return ERR_PTR(-ENOMEM);
2925
2926         for (h = 0; h < VNI_HASH_SIZE; ++h)
2927                 INIT_HLIST_HEAD(&vs->vni_list[h]);
2928
2929         sock = vxlan_create_sock(net, ipv6, port, flags);
2930         if (IS_ERR(sock)) {
2931                 kfree(vs);
2932                 return ERR_CAST(sock);
2933         }
2934
2935         vs->sock = sock;
2936         refcount_set(&vs->refcnt, 1);
2937         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2938
2939         spin_lock(&vn->sock_lock);
2940         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2941         udp_tunnel_notify_add_rx_port(sock,
2942                                       (vs->flags & VXLAN_F_GPE) ?
2943                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
2944                                       UDP_TUNNEL_TYPE_VXLAN);
2945         spin_unlock(&vn->sock_lock);
2946
2947         /* Mark socket as an encapsulation socket. */
2948         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
2949         tunnel_cfg.sk_user_data = vs;
2950         tunnel_cfg.encap_type = 1;
2951         tunnel_cfg.encap_rcv = vxlan_rcv;
2952         tunnel_cfg.encap_destroy = NULL;
2953         tunnel_cfg.gro_receive = vxlan_gro_receive;
2954         tunnel_cfg.gro_complete = vxlan_gro_complete;
2955
2956         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2957
2958         return vs;
2959 }
2960
2961 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2962 {
2963         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2964         struct vxlan_sock *vs = NULL;
2965         struct vxlan_dev_node *node;
2966
2967         if (!vxlan->cfg.no_share) {
2968                 spin_lock(&vn->sock_lock);
2969                 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2970                                      vxlan->cfg.dst_port, vxlan->cfg.flags);
2971                 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
2972                         spin_unlock(&vn->sock_lock);
2973                         return -EBUSY;
2974                 }
2975                 spin_unlock(&vn->sock_lock);
2976         }
2977         if (!vs)
2978                 vs = vxlan_socket_create(vxlan->net, ipv6,
2979                                          vxlan->cfg.dst_port, vxlan->cfg.flags);
2980         if (IS_ERR(vs))
2981                 return PTR_ERR(vs);
2982 #if IS_ENABLED(CONFIG_IPV6)
2983         if (ipv6) {
2984                 rcu_assign_pointer(vxlan->vn6_sock, vs);
2985                 node = &vxlan->hlist6;
2986         } else
2987 #endif
2988         {
2989                 rcu_assign_pointer(vxlan->vn4_sock, vs);
2990                 node = &vxlan->hlist4;
2991         }
2992         vxlan_vs_add_dev(vs, vxlan, node);
2993         return 0;
2994 }
2995
2996 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2997 {
2998         bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
2999         bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
3000         bool ipv4 = !ipv6 || metadata;
3001         int ret = 0;
3002
3003         RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
3004 #if IS_ENABLED(CONFIG_IPV6)
3005         RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
3006         if (ipv6) {
3007                 ret = __vxlan_sock_add(vxlan, true);
3008                 if (ret < 0 && ret != -EAFNOSUPPORT)
3009                         ipv4 = false;
3010         }
3011 #endif
3012         if (ipv4)
3013                 ret = __vxlan_sock_add(vxlan, false);
3014         if (ret < 0)
3015                 vxlan_sock_release(vxlan);
3016         return ret;
3017 }
3018
3019 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
3020                                  struct net_device **lower,
3021                                  struct vxlan_dev *old,
3022                                  struct netlink_ext_ack *extack)
3023 {
3024         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
3025         struct vxlan_dev *tmp;
3026         bool use_ipv6 = false;
3027
3028         if (conf->flags & VXLAN_F_GPE) {
3029                 /* For now, allow GPE only together with
3030                  * COLLECT_METADATA. This can be relaxed later; in such
3031                  * case, the other side of the PtP link will have to be
3032                  * provided.
3033                  */
3034                 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
3035                     !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3036                         NL_SET_ERR_MSG(extack,
3037                                        "VXLAN GPE does not support this combination of attributes");
3038                         return -EINVAL;
3039                 }
3040         }
3041
3042         if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
3043                 /* Unless IPv6 is explicitly requested, assume IPv4 */
3044                 conf->remote_ip.sa.sa_family = AF_INET;
3045                 conf->saddr.sa.sa_family = AF_INET;
3046         } else if (!conf->remote_ip.sa.sa_family) {
3047                 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
3048         } else if (!conf->saddr.sa.sa_family) {
3049                 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
3050         }
3051
3052         if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
3053                 NL_SET_ERR_MSG(extack,
3054                                "Local and remote address must be from the same family");
3055                 return -EINVAL;
3056         }
3057
3058         if (vxlan_addr_multicast(&conf->saddr)) {
3059                 NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
3060                 return -EINVAL;
3061         }
3062
3063         if (conf->saddr.sa.sa_family == AF_INET6) {
3064                 if (!IS_ENABLED(CONFIG_IPV6)) {
3065                         NL_SET_ERR_MSG(extack,
3066                                        "IPv6 support not enabled in the kernel");
3067                         return -EPFNOSUPPORT;
3068                 }
3069                 use_ipv6 = true;
3070                 conf->flags |= VXLAN_F_IPV6;
3071
3072                 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3073                         int local_type =
3074                                 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
3075                         int remote_type =
3076                                 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
3077
3078                         if (local_type & IPV6_ADDR_LINKLOCAL) {
3079                                 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
3080                                     (remote_type != IPV6_ADDR_ANY)) {
3081                                         NL_SET_ERR_MSG(extack,
3082                                                        "Invalid combination of local and remote address scopes");
3083                                         return -EINVAL;
3084                                 }
3085
3086                                 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
3087                         } else {
3088                                 if (remote_type ==
3089                                     (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
3090                                         NL_SET_ERR_MSG(extack,
3091                                                        "Invalid combination of local and remote address scopes");
3092                                         return -EINVAL;
3093                                 }
3094
3095                                 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
3096                         }
3097                 }
3098         }
3099
3100         if (conf->label && !use_ipv6) {
3101                 NL_SET_ERR_MSG(extack,
3102                                "Label attribute only applies to IPv6 VXLAN devices");
3103                 return -EINVAL;
3104         }
3105
3106         if (conf->remote_ifindex) {
3107                 struct net_device *lowerdev;
3108
3109                 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
3110                 if (!lowerdev) {
3111                         NL_SET_ERR_MSG(extack,
3112                                        "Invalid local interface, device not found");
3113                         return -ENODEV;
3114                 }
3115
3116 #if IS_ENABLED(CONFIG_IPV6)
3117                 if (use_ipv6) {
3118                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
3119                         if (idev && idev->cnf.disable_ipv6) {
3120                                 NL_SET_ERR_MSG(extack,
3121                                                "IPv6 support disabled by administrator");
3122                                 return -EPERM;
3123                         }
3124                 }
3125 #endif
3126
3127                 *lower = lowerdev;
3128         } else {
3129                 if (vxlan_addr_multicast(&conf->remote_ip)) {
3130                         NL_SET_ERR_MSG(extack,
3131                                        "Local interface required for multicast remote destination");
3132
3133                         return -EINVAL;
3134                 }
3135
3136 #if IS_ENABLED(CONFIG_IPV6)
3137                 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
3138                         NL_SET_ERR_MSG(extack,
3139                                        "Local interface required for link-local local/remote addresses");
3140                         return -EINVAL;
3141                 }
3142 #endif
3143
3144                 *lower = NULL;
3145         }
3146
3147         if (!conf->dst_port) {
3148                 if (conf->flags & VXLAN_F_GPE)
3149                         conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
3150                 else
3151                         conf->dst_port = htons(vxlan_port);
3152         }
3153
3154         if (!conf->age_interval)
3155                 conf->age_interval = FDB_AGE_DEFAULT;
3156
3157         list_for_each_entry(tmp, &vn->vxlan_list, next) {
3158                 if (tmp == old)
3159                         continue;
3160
3161                 if (tmp->cfg.vni != conf->vni)
3162                         continue;
3163                 if (tmp->cfg.dst_port != conf->dst_port)
3164                         continue;
3165                 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3166                     (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3167                         continue;
3168
3169                 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3170                     tmp->cfg.remote_ifindex != conf->remote_ifindex)
3171                         continue;
3172
3173                 NL_SET_ERR_MSG(extack,
3174                                "A VXLAN device with the specified VNI already exists");
3175                 return -EEXIST;
3176         }
3177
3178         return 0;
3179 }
3180
3181 static void vxlan_config_apply(struct net_device *dev,
3182                                struct vxlan_config *conf,
3183                                struct net_device *lowerdev,
3184                                struct net *src_net,
3185                                bool changelink)
3186 {
3187         struct vxlan_dev *vxlan = netdev_priv(dev);
3188         struct vxlan_rdst *dst = &vxlan->default_dst;
3189         unsigned short needed_headroom = ETH_HLEN;
3190         bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
3191         int max_mtu = ETH_MAX_MTU;
3192
3193         if (!changelink) {
3194                 if (conf->flags & VXLAN_F_GPE)
3195                         vxlan_raw_setup(dev);
3196                 else
3197                         vxlan_ether_setup(dev);
3198
3199                 if (conf->mtu)
3200                         dev->mtu = conf->mtu;
3201
3202                 vxlan->net = src_net;
3203         }
3204
3205         dst->remote_vni = conf->vni;
3206
3207         memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3208
3209         if (lowerdev) {
3210                 dst->remote_ifindex = conf->remote_ifindex;
3211
3212                 dev->gso_max_size = lowerdev->gso_max_size;
3213                 dev->gso_max_segs = lowerdev->gso_max_segs;
3214
3215                 needed_headroom = lowerdev->hard_header_len;
3216
3217                 max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
3218                                            VXLAN_HEADROOM);
3219                 if (max_mtu < ETH_MIN_MTU)
3220                         max_mtu = ETH_MIN_MTU;
3221
3222                 if (!changelink && !conf->mtu)
3223                         dev->mtu = max_mtu;
3224         }
3225
3226         if (dev->mtu > max_mtu)
3227                 dev->mtu = max_mtu;
3228
3229         if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
3230                 needed_headroom += VXLAN6_HEADROOM;
3231         else
3232                 needed_headroom += VXLAN_HEADROOM;
3233         dev->needed_headroom = needed_headroom;
3234
3235         memcpy(&vxlan->cfg, conf, sizeof(*conf));
3236 }
3237
3238 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3239                                struct vxlan_config *conf, bool changelink,
3240                                struct netlink_ext_ack *extack)
3241 {
3242         struct vxlan_dev *vxlan = netdev_priv(dev);
3243         struct net_device *lowerdev;
3244         int ret;
3245
3246         ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
3247         if (ret)
3248                 return ret;
3249
3250         vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3251
3252         return 0;
3253 }
3254
3255 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3256                               struct vxlan_config *conf,
3257                               struct netlink_ext_ack *extack)
3258 {
3259         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3260         struct vxlan_dev *vxlan = netdev_priv(dev);
3261         struct vxlan_fdb *f = NULL;
3262         bool unregister = false;
3263         int err;
3264
3265         err = vxlan_dev_configure(net, dev, conf, false, extack);
3266         if (err)
3267                 return err;
3268
3269         dev->ethtool_ops = &vxlan_ethtool_ops;
3270
3271         /* create an fdb entry for a valid default destination */
3272         if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
3273                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3274                                        &vxlan->default_dst.remote_ip,
3275                                        NUD_REACHABLE | NUD_PERMANENT,
3276                                        vxlan->cfg.dst_port,
3277                                        vxlan->default_dst.remote_vni,
3278                                        vxlan->default_dst.remote_vni,
3279                                        vxlan->default_dst.remote_ifindex,
3280                                        NTF_SELF, &f);
3281                 if (err)
3282                         return err;
3283         }
3284
3285         err = register_netdevice(dev);
3286         if (err)
3287                 goto errout;
3288         unregister = true;
3289
3290         err = rtnl_configure_link(dev, NULL);
3291         if (err)
3292                 goto errout;
3293
3294         /* notify default fdb entry */
3295         if (f)
3296                 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH);
3297
3298         list_add(&vxlan->next, &vn->vxlan_list);
3299         return 0;
3300
3301 errout:
3302         /* unregister_netdevice() destroys the default FDB entry with deletion
3303          * notification. But the addition notification was not sent yet, so
3304          * destroy the entry by hand here.
3305          */
3306         if (f)
3307                 vxlan_fdb_destroy(vxlan, f, false);
3308         if (unregister)
3309                 unregister_netdevice(dev);
3310         return err;
3311 }
3312
3313 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3314                          struct net_device *dev, struct vxlan_config *conf,
3315                          bool changelink)
3316 {
3317         struct vxlan_dev *vxlan = netdev_priv(dev);
3318
3319         memset(conf, 0, sizeof(*conf));
3320
3321         /* if changelink operation, start with old existing cfg */
3322         if (changelink)
3323                 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3324
3325         if (data[IFLA_VXLAN_ID]) {
3326                 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3327
3328                 if (changelink && (vni != conf->vni))
3329                         return -EOPNOTSUPP;
3330                 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3331         }
3332
3333         if (data[IFLA_VXLAN_GROUP]) {
3334                 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET))
3335                         return -EOPNOTSUPP;
3336
3337                 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
3338                 conf->remote_ip.sa.sa_family = AF_INET;
3339         } else if (data[IFLA_VXLAN_GROUP6]) {
3340                 if (!IS_ENABLED(CONFIG_IPV6))
3341                         return -EPFNOSUPPORT;
3342
3343                 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6))
3344                         return -EOPNOTSUPP;
3345
3346                 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
3347                 conf->remote_ip.sa.sa_family = AF_INET6;
3348         }
3349
3350         if (data[IFLA_VXLAN_LOCAL]) {
3351                 if (changelink && (conf->saddr.sa.sa_family != AF_INET))
3352                         return -EOPNOTSUPP;
3353
3354                 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
3355                 conf->saddr.sa.sa_family = AF_INET;
3356         } else if (data[IFLA_VXLAN_LOCAL6]) {
3357                 if (!IS_ENABLED(CONFIG_IPV6))
3358                         return -EPFNOSUPPORT;
3359
3360                 if (changelink && (conf->saddr.sa.sa_family != AF_INET6))
3361                         return -EOPNOTSUPP;
3362
3363                 /* TODO: respect scope id */
3364                 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3365                 conf->saddr.sa.sa_family = AF_INET6;
3366         }
3367
3368         if (data[IFLA_VXLAN_LINK])
3369                 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3370
3371         if (data[IFLA_VXLAN_TOS])
3372                 conf->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
3373
3374         if (data[IFLA_VXLAN_TTL])
3375                 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3376
3377         if (data[IFLA_VXLAN_TTL_INHERIT]) {
3378                 if (changelink)
3379                         return -EOPNOTSUPP;
3380                 conf->flags |= VXLAN_F_TTL_INHERIT;
3381         }
3382
3383         if (data[IFLA_VXLAN_LABEL])
3384                 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
3385                              IPV6_FLOWLABEL_MASK;
3386
3387         if (data[IFLA_VXLAN_LEARNING]) {
3388                 if (nla_get_u8(data[IFLA_VXLAN_LEARNING]))
3389                         conf->flags |= VXLAN_F_LEARN;
3390                 else
3391                         conf->flags &= ~VXLAN_F_LEARN;
3392         } else if (!changelink) {
3393                 /* default to learn on a new device */
3394                 conf->flags |= VXLAN_F_LEARN;
3395         }
3396
3397         if (data[IFLA_VXLAN_AGEING]) {
3398                 if (changelink)
3399                         return -EOPNOTSUPP;
3400                 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3401         }
3402
3403         if (data[IFLA_VXLAN_PROXY]) {
3404                 if (changelink)
3405                         return -EOPNOTSUPP;
3406                 if (nla_get_u8(data[IFLA_VXLAN_PROXY]))
3407                         conf->flags |= VXLAN_F_PROXY;
3408         }
3409
3410         if (data[IFLA_VXLAN_RSC]) {
3411                 if (changelink)
3412                         return -EOPNOTSUPP;
3413                 if (nla_get_u8(data[IFLA_VXLAN_RSC]))
3414                         conf->flags |= VXLAN_F_RSC;
3415         }
3416
3417         if (data[IFLA_VXLAN_L2MISS]) {
3418                 if (changelink)
3419                         return -EOPNOTSUPP;
3420                 if (nla_get_u8(data[IFLA_VXLAN_L2MISS]))
3421                         conf->flags |= VXLAN_F_L2MISS;
3422         }
3423
3424         if (data[IFLA_VXLAN_L3MISS]) {
3425                 if (changelink)
3426                         return -EOPNOTSUPP;
3427                 if (nla_get_u8(data[IFLA_VXLAN_L3MISS]))
3428                         conf->flags |= VXLAN_F_L3MISS;
3429         }
3430
3431         if (data[IFLA_VXLAN_LIMIT]) {
3432                 if (changelink)
3433                         return -EOPNOTSUPP;
3434                 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3435         }
3436
3437         if (data[IFLA_VXLAN_COLLECT_METADATA]) {
3438                 if (changelink)
3439                         return -EOPNOTSUPP;
3440                 if (nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
3441                         conf->flags |= VXLAN_F_COLLECT_METADATA;
3442         }
3443
3444         if (data[IFLA_VXLAN_PORT_RANGE]) {
3445                 if (!changelink) {
3446                         const struct ifla_vxlan_port_range *p
3447                                 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3448                         conf->port_min = ntohs(p->low);
3449                         conf->port_max = ntohs(p->high);
3450                 } else {
3451                         return -EOPNOTSUPP;
3452                 }
3453         }
3454
3455         if (data[IFLA_VXLAN_PORT]) {
3456                 if (changelink)
3457                         return -EOPNOTSUPP;
3458                 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3459         }
3460
3461         if (data[IFLA_VXLAN_UDP_CSUM]) {
3462                 if (changelink)
3463                         return -EOPNOTSUPP;
3464                 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3465                         conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3466         }
3467
3468         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
3469                 if (changelink)
3470                         return -EOPNOTSUPP;
3471                 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
3472                         conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
3473         }
3474
3475         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
3476                 if (changelink)
3477                         return -EOPNOTSUPP;
3478                 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3479                         conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3480         }
3481
3482         if (data[IFLA_VXLAN_REMCSUM_TX]) {
3483                 if (changelink)
3484                         return -EOPNOTSUPP;
3485                 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3486                         conf->flags |= VXLAN_F_REMCSUM_TX;
3487         }
3488
3489         if (data[IFLA_VXLAN_REMCSUM_RX]) {
3490                 if (changelink)
3491                         return -EOPNOTSUPP;
3492                 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3493                         conf->flags |= VXLAN_F_REMCSUM_RX;
3494         }
3495
3496         if (data[IFLA_VXLAN_GBP]) {
3497                 if (changelink)
3498                         return -EOPNOTSUPP;
3499                 conf->flags |= VXLAN_F_GBP;
3500         }
3501
3502         if (data[IFLA_VXLAN_GPE]) {
3503                 if (changelink)
3504                         return -EOPNOTSUPP;
3505                 conf->flags |= VXLAN_F_GPE;
3506         }
3507
3508         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
3509                 if (changelink)
3510                         return -EOPNOTSUPP;
3511                 conf->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3512         }
3513
3514         if (tb[IFLA_MTU]) {
3515                 if (changelink)
3516                         return -EOPNOTSUPP;
3517                 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
3518         }
3519
3520         return 0;
3521 }
3522
3523 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
3524                          struct nlattr *tb[], struct nlattr *data[],
3525                          struct netlink_ext_ack *extack)
3526 {
3527         struct vxlan_config conf;
3528         int err;
3529
3530         err = vxlan_nl2conf(tb, data, dev, &conf, false);
3531         if (err)
3532                 return err;
3533
3534         return __vxlan_dev_create(src_net, dev, &conf, extack);
3535 }
3536
3537 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
3538                             struct nlattr *data[],
3539                             struct netlink_ext_ack *extack)
3540 {
3541         struct vxlan_dev *vxlan = netdev_priv(dev);
3542         struct vxlan_rdst *dst = &vxlan->default_dst;
3543         struct vxlan_rdst old_dst;
3544         struct vxlan_config conf;
3545         int err;
3546
3547         err = vxlan_nl2conf(tb, data,
3548                             dev, &conf, true);
3549         if (err)
3550                 return err;
3551
3552         memcpy(&old_dst, dst, sizeof(struct vxlan_rdst));
3553
3554         err = vxlan_dev_configure(vxlan->net, dev, &conf, true, extack);
3555         if (err)
3556                 return err;
3557
3558         /* handle default dst entry */
3559         if (!vxlan_addr_equal(&dst->remote_ip, &old_dst.remote_ip)) {
3560                 spin_lock_bh(&vxlan->hash_lock);
3561                 if (!vxlan_addr_any(&old_dst.remote_ip))
3562                         __vxlan_fdb_delete(vxlan, all_zeros_mac,
3563                                            old_dst.remote_ip,
3564                                            vxlan->cfg.dst_port,
3565                                            old_dst.remote_vni,
3566                                            old_dst.remote_vni,
3567                                            old_dst.remote_ifindex, 0);
3568
3569                 if (!vxlan_addr_any(&dst->remote_ip)) {
3570                         err = vxlan_fdb_update(vxlan, all_zeros_mac,
3571                                                &dst->remote_ip,
3572                                                NUD_REACHABLE | NUD_PERMANENT,
3573                                                NLM_F_APPEND | NLM_F_CREATE,
3574                                                vxlan->cfg.dst_port,
3575                                                dst->remote_vni,
3576                                                dst->remote_vni,
3577                                                dst->remote_ifindex,
3578                                                NTF_SELF);
3579                         if (err) {
3580                                 spin_unlock_bh(&vxlan->hash_lock);
3581                                 return err;
3582                         }
3583                 }
3584                 spin_unlock_bh(&vxlan->hash_lock);
3585         }
3586
3587         return 0;
3588 }
3589
3590 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3591 {
3592         struct vxlan_dev *vxlan = netdev_priv(dev);
3593
3594         vxlan_flush(vxlan, true);
3595
3596         gro_cells_destroy(&vxlan->gro_cells);
3597         list_del(&vxlan->next);
3598         unregister_netdevice_queue(dev, head);
3599 }
3600
3601 static size_t vxlan_get_size(const struct net_device *dev)
3602 {
3603
3604         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
3605                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3606                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3607                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3608                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
3609                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL_INHERIT */
3610                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
3611                 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3612                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
3613                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
3614                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
3615                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
3616                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
3617                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_COLLECT_METADATA */
3618                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3619                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3620                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3621                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3622                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3623                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3624                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3625                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3626                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3627                 0;
3628 }
3629
3630 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3631 {
3632         const struct vxlan_dev *vxlan = netdev_priv(dev);
3633         const struct vxlan_rdst *dst = &vxlan->default_dst;
3634         struct ifla_vxlan_port_range ports = {
3635                 .low =  htons(vxlan->cfg.port_min),
3636                 .high = htons(vxlan->cfg.port_max),
3637         };
3638
3639         if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3640                 goto nla_put_failure;
3641
3642         if (!vxlan_addr_any(&dst->remote_ip)) {
3643                 if (dst->remote_ip.sa.sa_family == AF_INET) {
3644                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3645                                             dst->remote_ip.sin.sin_addr.s_addr))
3646                                 goto nla_put_failure;
3647 #if IS_ENABLED(CONFIG_IPV6)
3648                 } else {
3649                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3650                                              &dst->remote_ip.sin6.sin6_addr))
3651                                 goto nla_put_failure;
3652 #endif
3653                 }
3654         }
3655
3656         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3657                 goto nla_put_failure;
3658
3659         if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3660                 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3661                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3662                                             vxlan->cfg.saddr.sin.sin_addr.s_addr))
3663                                 goto nla_put_failure;
3664 #if IS_ENABLED(CONFIG_IPV6)
3665                 } else {
3666                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3667                                              &vxlan->cfg.saddr.sin6.sin6_addr))
3668                                 goto nla_put_failure;
3669 #endif
3670                 }
3671         }
3672
3673         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3674             nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
3675                        !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
3676             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3677             nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3678             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3679                         !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
3680             nla_put_u8(skb, IFLA_VXLAN_PROXY,
3681                         !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
3682             nla_put_u8(skb, IFLA_VXLAN_RSC,
3683                        !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
3684             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3685                         !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
3686             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3687                         !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
3688             nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3689                        !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
3690             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3691             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3692             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3693             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3694                         !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3695             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3696                         !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3697             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3698                         !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3699             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3700                         !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
3701             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3702                         !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
3703                 goto nla_put_failure;
3704
3705         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3706                 goto nla_put_failure;
3707
3708         if (vxlan->cfg.flags & VXLAN_F_GBP &&
3709             nla_put_flag(skb, IFLA_VXLAN_GBP))
3710                 goto nla_put_failure;
3711
3712         if (vxlan->cfg.flags & VXLAN_F_GPE &&
3713             nla_put_flag(skb, IFLA_VXLAN_GPE))
3714                 goto nla_put_failure;
3715
3716         if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3717             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3718                 goto nla_put_failure;
3719
3720         return 0;
3721
3722 nla_put_failure:
3723         return -EMSGSIZE;
3724 }
3725
3726 static struct net *vxlan_get_link_net(const struct net_device *dev)
3727 {
3728         struct vxlan_dev *vxlan = netdev_priv(dev);
3729
3730         return vxlan->net;
3731 }
3732
3733 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3734         .kind           = "vxlan",
3735         .maxtype        = IFLA_VXLAN_MAX,
3736         .policy         = vxlan_policy,
3737         .priv_size      = sizeof(struct vxlan_dev),
3738         .setup          = vxlan_setup,
3739         .validate       = vxlan_validate,
3740         .newlink        = vxlan_newlink,
3741         .changelink     = vxlan_changelink,
3742         .dellink        = vxlan_dellink,
3743         .get_size       = vxlan_get_size,
3744         .fill_info      = vxlan_fill_info,
3745         .get_link_net   = vxlan_get_link_net,
3746 };
3747
3748 struct net_device *vxlan_dev_create(struct net *net, const char *name,
3749                                     u8 name_assign_type,
3750                                     struct vxlan_config *conf)
3751 {
3752         struct nlattr *tb[IFLA_MAX + 1];
3753         struct net_device *dev;
3754         int err;
3755
3756         memset(&tb, 0, sizeof(tb));
3757
3758         dev = rtnl_create_link(net, name, name_assign_type,
3759                                &vxlan_link_ops, tb);
3760         if (IS_ERR(dev))
3761                 return dev;
3762
3763         err = __vxlan_dev_create(net, dev, conf, NULL);
3764         if (err < 0) {
3765                 free_netdev(dev);
3766                 return ERR_PTR(err);
3767         }
3768
3769         err = rtnl_configure_link(dev, NULL);
3770         if (err < 0) {
3771                 LIST_HEAD(list_kill);
3772
3773                 vxlan_dellink(dev, &list_kill);
3774                 unregister_netdevice_many(&list_kill);
3775                 return ERR_PTR(err);
3776         }
3777
3778         return dev;
3779 }
3780 EXPORT_SYMBOL_GPL(vxlan_dev_create);
3781
3782 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3783                                              struct net_device *dev)
3784 {
3785         struct vxlan_dev *vxlan, *next;
3786         LIST_HEAD(list_kill);
3787
3788         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3789                 struct vxlan_rdst *dst = &vxlan->default_dst;
3790
3791                 /* In case we created vxlan device with carrier
3792                  * and we loose the carrier due to module unload
3793                  * we also need to remove vxlan device. In other
3794                  * cases, it's not necessary and remote_ifindex
3795                  * is 0 here, so no matches.
3796                  */
3797                 if (dst->remote_ifindex == dev->ifindex)
3798                         vxlan_dellink(vxlan->dev, &list_kill);
3799         }
3800
3801         unregister_netdevice_many(&list_kill);
3802 }
3803
3804 static int vxlan_netdevice_event(struct notifier_block *unused,
3805                                  unsigned long event, void *ptr)
3806 {
3807         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3808         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3809
3810         if (event == NETDEV_UNREGISTER) {
3811                 vxlan_offload_rx_ports(dev, false);
3812                 vxlan_handle_lowerdev_unregister(vn, dev);
3813         } else if (event == NETDEV_REGISTER) {
3814                 vxlan_offload_rx_ports(dev, true);
3815         } else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
3816                    event == NETDEV_UDP_TUNNEL_DROP_INFO) {
3817                 vxlan_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
3818         }
3819
3820         return NOTIFY_DONE;
3821 }
3822
3823 static struct notifier_block vxlan_notifier_block __read_mostly = {
3824         .notifier_call = vxlan_netdevice_event,
3825 };
3826
3827 static void
3828 vxlan_fdb_offloaded_set(struct net_device *dev,
3829                         struct switchdev_notifier_vxlan_fdb_info *fdb_info)
3830 {
3831         struct vxlan_dev *vxlan = netdev_priv(dev);
3832         struct vxlan_rdst *rdst;
3833         struct vxlan_fdb *f;
3834
3835         spin_lock_bh(&vxlan->hash_lock);
3836
3837         f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
3838         if (!f)
3839                 goto out;
3840
3841         rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip,
3842                                    fdb_info->remote_port,
3843                                    fdb_info->remote_vni,
3844                                    fdb_info->remote_ifindex);
3845         if (!rdst)
3846                 goto out;
3847
3848         rdst->offloaded = fdb_info->offloaded;
3849
3850 out:
3851         spin_unlock_bh(&vxlan->hash_lock);
3852 }
3853
3854 static int vxlan_switchdev_event(struct notifier_block *unused,
3855                                  unsigned long event, void *ptr)
3856 {
3857         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
3858
3859         switch (event) {
3860         case SWITCHDEV_VXLAN_FDB_OFFLOADED:
3861                 vxlan_fdb_offloaded_set(dev, ptr);
3862                 break;
3863         }
3864
3865         return 0;
3866 }
3867
3868 static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {
3869         .notifier_call = vxlan_switchdev_event,
3870 };
3871
3872 static __net_init int vxlan_init_net(struct net *net)
3873 {
3874         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3875         unsigned int h;
3876
3877         INIT_LIST_HEAD(&vn->vxlan_list);
3878         spin_lock_init(&vn->sock_lock);
3879
3880         for (h = 0; h < PORT_HASH_SIZE; ++h)
3881                 INIT_HLIST_HEAD(&vn->sock_list[h]);
3882
3883         return 0;
3884 }
3885
3886 static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
3887 {
3888         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3889         struct vxlan_dev *vxlan, *next;
3890         struct net_device *dev, *aux;
3891         unsigned int h;
3892
3893         for_each_netdev_safe(net, dev, aux)
3894                 if (dev->rtnl_link_ops == &vxlan_link_ops)
3895                         unregister_netdevice_queue(dev, head);
3896
3897         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3898                 /* If vxlan->dev is in the same netns, it has already been added
3899                  * to the list by the previous loop.
3900                  */
3901                 if (!net_eq(dev_net(vxlan->dev), net)) {
3902                         gro_cells_destroy(&vxlan->gro_cells);
3903                         unregister_netdevice_queue(vxlan->dev, head);
3904                 }
3905         }
3906
3907         for (h = 0; h < PORT_HASH_SIZE; ++h)
3908                 WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
3909 }
3910
3911 static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
3912 {
3913         struct net *net;
3914         LIST_HEAD(list);
3915
3916         rtnl_lock();
3917         list_for_each_entry(net, net_list, exit_list)
3918                 vxlan_destroy_tunnels(net, &list);
3919
3920         unregister_netdevice_many(&list);
3921         rtnl_unlock();
3922 }
3923
3924 static struct pernet_operations vxlan_net_ops = {
3925         .init = vxlan_init_net,
3926         .exit_batch = vxlan_exit_batch_net,
3927         .id   = &vxlan_net_id,
3928         .size = sizeof(struct vxlan_net),
3929 };
3930
3931 static int __init vxlan_init_module(void)
3932 {
3933         int rc;
3934
3935         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3936
3937         rc = register_pernet_subsys(&vxlan_net_ops);
3938         if (rc)
3939                 goto out1;
3940
3941         rc = register_netdevice_notifier(&vxlan_notifier_block);
3942         if (rc)
3943                 goto out2;
3944
3945         rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block);
3946         if (rc)
3947                 goto out3;
3948
3949         rc = rtnl_link_register(&vxlan_link_ops);
3950         if (rc)
3951                 goto out4;
3952
3953         return 0;
3954 out4:
3955         unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
3956 out3:
3957         unregister_netdevice_notifier(&vxlan_notifier_block);
3958 out2:
3959         unregister_pernet_subsys(&vxlan_net_ops);
3960 out1:
3961         return rc;
3962 }
3963 late_initcall(vxlan_init_module);
3964
3965 static void __exit vxlan_cleanup_module(void)
3966 {
3967         rtnl_link_unregister(&vxlan_link_ops);
3968         unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
3969         unregister_netdevice_notifier(&vxlan_notifier_block);
3970         unregister_pernet_subsys(&vxlan_net_ops);
3971         /* rcu_barrier() is called by netns */
3972 }
3973 module_exit(vxlan_cleanup_module);
3974
3975 MODULE_LICENSE("GPL");
3976 MODULE_VERSION(VXLAN_VERSION);
3977 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3978 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3979 MODULE_ALIAS_RTNL_LINK("vxlan");