net/openvswitch/datapath.c

   1 /*
   2  * Copyright (c) 2007-2014 Nicira, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of version 2 of the GNU General Public
   6  * License as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  16  * 02110-1301, USA
  17  */
  18
  19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  20
  21 #include <linux/init.h>
  22 #include <linux/module.h>
  23 #include <linux/if_arp.h>
  24 #include <linux/if_vlan.h>
  25 #include <linux/in.h>
  26 #include <linux/ip.h>
  27 #include <linux/jhash.h>
  28 #include <linux/delay.h>
  29 #include <linux/time.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/genetlink.h>
  32 #include <linux/kernel.h>
  33 #include <linux/kthread.h>
  34 #include <linux/mutex.h>
  35 #include <linux/percpu.h>
  36 #include <linux/rcupdate.h>
  37 #include <linux/tcp.h>
  38 #include <linux/udp.h>
  39 #include <linux/ethtool.h>
  40 #include <linux/wait.h>
  41 #include <asm/div64.h>
  42 #include <linux/highmem.h>
  43 #include <linux/netfilter_bridge.h>
  44 #include <linux/netfilter_ipv4.h>
  45 #include <linux/inetdevice.h>
  46 #include <linux/list.h>
  47 #include <linux/openvswitch.h>
  48 #include <linux/rculist.h>
  49 #include <linux/dmi.h>
  50 #include <net/genetlink.h>
  51 #include <net/net_namespace.h>
  52 #include <net/netns/generic.h>
  53
  54 #include "datapath.h"
  55 #include "flow.h"
  56 #include "flow_table.h"
  57 #include "flow_netlink.h"
  58 #include "vport-internal_dev.h"
  59 #include "vport-netdev.h"
  60
  61 unsigned int ovs_net_id __read_mostly;
  62
  63 static struct genl_family dp_packet_genl_family;
  64 static struct genl_family dp_flow_genl_family;
  65 static struct genl_family dp_datapath_genl_family;
  66
  67 static const struct nla_policy flow_policy[];
  68
  69 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
  70         .name = OVS_FLOW_MCGROUP,
  71 };
  72
  73 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
  74         .name = OVS_DATAPATH_MCGROUP,
  75 };
  76
  77 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
  78         .name = OVS_VPORT_MCGROUP,
  79 };
  80
  81 /* Check if need to build a reply message.
  82  * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
  83 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
  84                             unsigned int group)
  85 {
  86         return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
  87                genl_has_listeners(family, genl_info_net(info), group);
  88 }
  89
  90 static void ovs_notify(struct genl_family *family,
  91                        struct sk_buff *skb, struct genl_info *info)
  92 {
  93         genl_notify(family, skb, info, 0, GFP_KERNEL);
  94 }
  95
  96 /**
  97  * DOC: Locking:
  98  *
  99  * All writes e.g. Writes to device state (add/remove datapath, port, set
 100  * operations on vports, etc.), Writes to other state (flow table
 101  * modifications, set miscellaneous datapath parameters, etc.) are protected
 102  * by ovs_lock.
 103  *
 104  * Reads are protected by RCU.
 105  *
 106  * There are a few special cases (mostly stats) that have their own
 107  * synchronization but they nest under all of above and don't interact with
 108  * each other.
 109  *
 110  * The RTNL lock nests inside ovs_mutex.
 111  */
 112
 113 static DEFINE_MUTEX(ovs_mutex);
 114
 115 void ovs_lock(void)
 116 {
 117         mutex_lock(&ovs_mutex);
 118 }
 119
 120 void ovs_unlock(void)
 121 {
 122         mutex_unlock(&ovs_mutex);
 123 }
 124
 125 #ifdef CONFIG_LOCKDEP
 126 int lockdep_ovsl_is_held(void)
 127 {
 128         if (debug_locks)
 129                 return lockdep_is_held(&ovs_mutex);
 130         else
 131                 return 1;
 132 }
 133 #endif
 134
 135 static struct vport *new_vport(const struct vport_parms *);
 136 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
 137                              const struct sw_flow_key *,
 138                              const struct dp_upcall_info *,
 139                              uint32_t cutlen);
 140 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
 141                                   const struct sw_flow_key *,
 142                                   const struct dp_upcall_info *,
 143                                   uint32_t cutlen);
 144
 145 /* Must be called with rcu_read_lock. */
 146 static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
 147 {
 148         struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
 149
 150         if (dev) {
 151                 struct vport *vport = ovs_internal_dev_get_vport(dev);
 152                 if (vport)
 153                         return vport->dp;
 154         }
 155
 156         return NULL;
 157 }
 158
 159 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the
 160  * returned dp pointer valid.
 161  */
 162 static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
 163 {
 164         struct datapath *dp;
 165
 166         WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
 167         rcu_read_lock();
 168         dp = get_dp_rcu(net, dp_ifindex);
 169         rcu_read_unlock();
 170
 171         return dp;
 172 }
 173
 174 /* Must be called with rcu_read_lock or ovs_mutex. */
 175 const char *ovs_dp_name(const struct datapath *dp)
 176 {
 177         struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
 178         return ovs_vport_name(vport);
 179 }
 180
 181 static int get_dpifindex(const struct datapath *dp)
 182 {
 183         struct vport *local;
 184         int ifindex;
 185
 186         rcu_read_lock();
 187
 188         local = ovs_vport_rcu(dp, OVSP_LOCAL);
 189         if (local)
 190                 ifindex = local->dev->ifindex;
 191         else
 192                 ifindex = 0;
 193
 194         rcu_read_unlock();
 195
 196         return ifindex;
 197 }
 198
 199 static void destroy_dp_rcu(struct rcu_head *rcu)
 200 {
 201         struct datapath *dp = container_of(rcu, struct datapath, rcu);
 202
 203         ovs_flow_tbl_destroy(&dp->table);
 204         free_percpu(dp->stats_percpu);
 205         kfree(dp->ports);
 206         kfree(dp);
 207 }
 208
 209 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
 210                                             u16 port_no)
 211 {
 212         return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
 213 }
 214
 215 /* Called with ovs_mutex or RCU read lock. */
 216 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
 217 {
 218         struct vport *vport;
 219         struct hlist_head *head;
 220
 221         head = vport_hash_bucket(dp, port_no);
 222         hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
 223                 if (vport->port_no == port_no)
 224                         return vport;
 225         }
 226         return NULL;
 227 }
 228
 229 /* Called with ovs_mutex. */
 230 static struct vport *new_vport(const struct vport_parms *parms)
 231 {
 232         struct vport *vport;
 233
 234         vport = ovs_vport_add(parms);
 235         if (!IS_ERR(vport)) {
 236                 struct datapath *dp = parms->dp;
 237                 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
 238
 239                 hlist_add_head_rcu(&vport->dp_hash_node, head);
 240         }
 241         return vport;
 242 }
 243
 244 void ovs_dp_detach_port(struct vport *p)
 245 {
 246         ASSERT_OVSL();
 247
 248         /* First drop references to device. */
 249         hlist_del_rcu(&p->dp_hash_node);
 250
 251         /* Then destroy it. */
 252         ovs_vport_del(p);
 253 }
 254
 255 /* Must be called with rcu_read_lock. */
 256 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
 257 {
 258         const struct vport *p = OVS_CB(skb)->input_vport;
 259         struct datapath *dp = p->dp;
 260         struct sw_flow *flow;
 261         struct sw_flow_actions *sf_acts;
 262         struct dp_stats_percpu *stats;
 263         u64 *stats_counter;
 264         u32 n_mask_hit;
 265
 266         stats = this_cpu_ptr(dp->stats_percpu);
 267
 268         /* Look up flow. */
 269         flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
 270         if (unlikely(!flow)) {
 271                 struct dp_upcall_info upcall;
 272                 int error;
 273
 274                 memset(&upcall, 0, sizeof(upcall));
 275                 upcall.cmd = OVS_PACKET_CMD_MISS;
 276                 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
 277                 upcall.mru = OVS_CB(skb)->mru;
 278                 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
 279                 if (unlikely(error))
 280                         kfree_skb(skb);
 281                 else
 282                         consume_skb(skb);
 283                 stats_counter = &stats->n_missed;
 284                 goto out;
 285         }
 286
 287         ovs_flow_stats_update(flow, key->tp.flags, skb);
 288         sf_acts = rcu_dereference(flow->sf_acts);
 289         ovs_execute_actions(dp, skb, sf_acts, key);
 290
 291         stats_counter = &stats->n_hit;
 292
 293 out:
 294         /* Update datapath statistics. */
 295         u64_stats_update_begin(&stats->syncp);
 296         (*stats_counter)++;
 297         stats->n_mask_hit += n_mask_hit;
 298         u64_stats_update_end(&stats->syncp);
 299 }
 300
 301 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
 302                   const struct sw_flow_key *key,
 303                   const struct dp_upcall_info *upcall_info,
 304                   uint32_t cutlen)
 305 {
 306         struct dp_stats_percpu *stats;
 307         int err;
 308
 309         if (upcall_info->portid == 0) {
 310                 err = -ENOTCONN;
 311                 goto err;
 312         }
 313
 314         if (!skb_is_gso(skb))
 315                 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
 316         else
 317                 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
 318         if (err)
 319                 goto err;
 320
 321         return 0;
 322
 323 err:
 324         stats = this_cpu_ptr(dp->stats_percpu);
 325
 326         u64_stats_update_begin(&stats->syncp);
 327         stats->n_lost++;
 328         u64_stats_update_end(&stats->syncp);
 329
 330         return err;
 331 }
 332
 333 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
 334                              const struct sw_flow_key *key,
 335                              const struct dp_upcall_info *upcall_info,
 336                                  uint32_t cutlen)
 337 {
 338         unsigned short gso_type = skb_shinfo(skb)->gso_type;
 339         struct sw_flow_key later_key;
 340         struct sk_buff *segs, *nskb;
 341         int err;
 342
 343         BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET);
 344         segs = __skb_gso_segment(skb, NETIF_F_SG, false);
 345         if (IS_ERR(segs))
 346                 return PTR_ERR(segs);
 347         if (segs == NULL)
 348                 return -EINVAL;
 349
 350         if (gso_type & SKB_GSO_UDP) {
 351                 /* The initial flow key extracted by ovs_flow_key_extract()
 352                  * in this case is for a first fragment, so we need to
 353                  * properly mark later fragments.
 354                  */
 355                 later_key = *key;
 356                 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
 357         }
 358
 359         /* Queue all of the segments. */
 360         skb = segs;
 361         do {
 362                 if (gso_type & SKB_GSO_UDP && skb != segs)
 363                         key = &later_key;
 364
 365                 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
 366                 if (err)
 367                         break;
 368
 369         } while ((skb = skb->next));
 370
 371         /* Free all of the segments. */
 372         skb = segs;
 373         do {
 374                 nskb = skb->next;
 375                 if (err)
 376                         kfree_skb(skb);
 377                 else
 378                         consume_skb(skb);
 379         } while ((skb = nskb));
 380         return err;
 381 }
 382
 383 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
 384                               unsigned int hdrlen)
 385 {
 386         size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
 387                 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
 388                 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
 389                 + nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */
 390
 391         /* OVS_PACKET_ATTR_USERDATA */
 392         if (upcall_info->userdata)
 393                 size += NLA_ALIGN(upcall_info->userdata->nla_len);
 394
 395         /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
 396         if (upcall_info->egress_tun_info)
 397                 size += nla_total_size(ovs_tun_key_attr_size());
 398
 399         /* OVS_PACKET_ATTR_ACTIONS */
 400         if (upcall_info->actions_len)
 401                 size += nla_total_size(upcall_info->actions_len);
 402
 403         /* OVS_PACKET_ATTR_MRU */
 404         if (upcall_info->mru)
 405                 size += nla_total_size(sizeof(upcall_info->mru));
 406
 407         return size;
 408 }
 409
 410 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
 411 {
 412         if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
 413                 size_t plen = NLA_ALIGN(skb->len) - skb->len;
 414
 415                 if (plen > 0)
 416                         skb_put_zero(skb, plen);
 417         }
 418 }
 419
 420 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
 421                                   const struct sw_flow_key *key,
 422                                   const struct dp_upcall_info *upcall_info,
 423                                   uint32_t cutlen)
 424 {
 425         struct ovs_header *upcall;
 426         struct sk_buff *nskb = NULL;
 427         struct sk_buff *user_skb = NULL; /* to be queued to userspace */
 428         struct nlattr *nla;
 429         size_t len;
 430         unsigned int hlen;
 431         int err, dp_ifindex;
 432
 433         dp_ifindex = get_dpifindex(dp);
 434         if (!dp_ifindex)
 435                 return -ENODEV;
 436
 437         if (skb_vlan_tag_present(skb)) {
 438                 nskb = skb_clone(skb, GFP_ATOMIC);
 439                 if (!nskb)
 440                         return -ENOMEM;
 441
 442                 nskb = __vlan_hwaccel_push_inside(nskb);
 443                 if (!nskb)
 444                         return -ENOMEM;
 445
 446                 skb = nskb;
 447         }
 448
 449         if (nla_attr_size(skb->len) > USHRT_MAX) {
 450                 err = -EFBIG;
 451                 goto out;
 452         }
 453
 454         /* Complete checksum if needed */
 455         if (skb->ip_summed == CHECKSUM_PARTIAL &&
 456             (err = skb_csum_hwoffload_help(skb, 0)))
 457                 goto out;
 458
 459         /* Older versions of OVS user space enforce alignment of the last
 460          * Netlink attribute to NLA_ALIGNTO which would require extensive
 461          * padding logic. Only perform zerocopy if padding is not required.
 462          */
 463         if (dp->user_features & OVS_DP_F_UNALIGNED)
 464                 hlen = skb_zerocopy_headlen(skb);
 465         else
 466                 hlen = skb->len;
 467
 468         len = upcall_msg_size(upcall_info, hlen - cutlen);
 469         user_skb = genlmsg_new(len, GFP_ATOMIC);
 470         if (!user_skb) {
 471                 err = -ENOMEM;
 472                 goto out;
 473         }
 474
 475         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
 476                              0, upcall_info->cmd);
 477         upcall->dp_ifindex = dp_ifindex;
 478
 479         err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
 480         BUG_ON(err);
 481
 482         if (upcall_info->userdata)
 483                 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
 484                           nla_len(upcall_info->userdata),
 485                           nla_data(upcall_info->userdata));
 486
 487         if (upcall_info->egress_tun_info) {
 488                 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
 489                 err = ovs_nla_put_tunnel_info(user_skb,
 490                                               upcall_info->egress_tun_info);
 491                 BUG_ON(err);
 492                 nla_nest_end(user_skb, nla);
 493         }
 494
 495         if (upcall_info->actions_len) {
 496                 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
 497                 err = ovs_nla_put_actions(upcall_info->actions,
 498                                           upcall_info->actions_len,
 499                                           user_skb);
 500                 if (!err)
 501                         nla_nest_end(user_skb, nla);
 502                 else
 503                         nla_nest_cancel(user_skb, nla);
 504         }
 505
 506         /* Add OVS_PACKET_ATTR_MRU */
 507         if (upcall_info->mru) {
 508                 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
 509                                 upcall_info->mru)) {
 510                         err = -ENOBUFS;
 511                         goto out;
 512                 }
 513                 pad_packet(dp, user_skb);
 514         }
 515
 516         /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
 517         if (cutlen > 0) {
 518                 if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN,
 519                                 skb->len)) {
 520                         err = -ENOBUFS;
 521                         goto out;
 522                 }
 523                 pad_packet(dp, user_skb);
 524         }
 525
 526         /* Only reserve room for attribute header, packet data is added
 527          * in skb_zerocopy() */
 528         if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
 529                 err = -ENOBUFS;
 530                 goto out;
 531         }
 532         nla->nla_len = nla_attr_size(skb->len - cutlen);
 533
 534         err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
 535         if (err)
 536                 goto out;
 537
 538         /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
 539         pad_packet(dp, user_skb);
 540
 541         ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
 542
 543         err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
 544         user_skb = NULL;
 545 out:
 546         if (err)
 547                 skb_tx_error(skb);
 548         kfree_skb(user_skb);
 549         kfree_skb(nskb);
 550         return err;
 551 }
 552
 553 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 554 {
 555         struct ovs_header *ovs_header = info->userhdr;
 556         struct net *net = sock_net(skb->sk);
 557         struct nlattr **a = info->attrs;
 558         struct sw_flow_actions *acts;
 559         struct sk_buff *packet;
 560         struct sw_flow *flow;
 561         struct sw_flow_actions *sf_acts;
 562         struct datapath *dp;
 563         struct vport *input_vport;
 564         u16 mru = 0;
 565         int len;
 566         int err;
 567         bool log = !a[OVS_PACKET_ATTR_PROBE];
 568
 569         err = -EINVAL;
 570         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 571             !a[OVS_PACKET_ATTR_ACTIONS])
 572                 goto err;
 573
 574         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 575         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 576         err = -ENOMEM;
 577         if (!packet)
 578                 goto err;
 579         skb_reserve(packet, NET_IP_ALIGN);
 580
 581         nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
 582
 583         /* Set packet's mru */
 584         if (a[OVS_PACKET_ATTR_MRU]) {
 585                 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
 586                 packet->ignore_df = 1;
 587         }
 588         OVS_CB(packet)->mru = mru;
 589
 590         /* Build an sw_flow for sending this packet. */
 591         flow = ovs_flow_alloc();
 592         err = PTR_ERR(flow);
 593         if (IS_ERR(flow))
 594                 goto err_kfree_skb;
 595
 596         err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
 597                                              packet, &flow->key, log);
 598         if (err)
 599                 goto err_flow_free;
 600
 601         err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
 602                                    &flow->key, &acts, log);
 603         if (err)
 604                 goto err_flow_free;
 605
 606         rcu_assign_pointer(flow->sf_acts, acts);
 607         packet->priority = flow->key.phy.priority;
 608         packet->mark = flow->key.phy.skb_mark;
 609
 610         rcu_read_lock();
 611         dp = get_dp_rcu(net, ovs_header->dp_ifindex);
 612         err = -ENODEV;
 613         if (!dp)
 614                 goto err_unlock;
 615
 616         input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
 617         if (!input_vport)
 618                 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
 619
 620         if (!input_vport)
 621                 goto err_unlock;
 622
 623         packet->dev = input_vport->dev;
 624         OVS_CB(packet)->input_vport = input_vport;
 625         sf_acts = rcu_dereference(flow->sf_acts);
 626
 627         local_bh_disable();
 628         err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
 629         local_bh_enable();
 630         rcu_read_unlock();
 631
 632         ovs_flow_free(flow, false);
 633         return err;
 634
 635 err_unlock:
 636         rcu_read_unlock();
 637 err_flow_free:
 638         ovs_flow_free(flow, false);
 639 err_kfree_skb:
 640         kfree_skb(packet);
 641 err:
 642         return err;
 643 }
 644
 645 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 646         [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
 647         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 648         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 649         [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
 650         [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
 651 };
 652
 653 static const struct genl_ops dp_packet_genl_ops[] = {
 654         { .cmd = OVS_PACKET_CMD_EXECUTE,
 655           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 656           .policy = packet_policy,
 657           .doit = ovs_packet_cmd_execute
 658         }
 659 };
 660
 661 static struct genl_family dp_packet_genl_family __ro_after_init = {
 662         .hdrsize = sizeof(struct ovs_header),
 663         .name = OVS_PACKET_FAMILY,
 664         .version = OVS_PACKET_VERSION,
 665         .maxattr = OVS_PACKET_ATTR_MAX,
 666         .netnsok = true,
 667         .parallel_ops = true,
 668         .ops = dp_packet_genl_ops,
 669         .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
 670         .module = THIS_MODULE,
 671 };
 672
 673 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
 674                          struct ovs_dp_megaflow_stats *mega_stats)
 675 {
 676         int i;
 677
 678         memset(mega_stats, 0, sizeof(*mega_stats));
 679
 680         stats->n_flows = ovs_flow_tbl_count(&dp->table);
 681         mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
 682
 683         stats->n_hit = stats->n_missed = stats->n_lost = 0;
 684
 685         for_each_possible_cpu(i) {
 686                 const struct dp_stats_percpu *percpu_stats;
 687                 struct dp_stats_percpu local_stats;
 688                 unsigned int start;
 689
 690                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 691
 692                 do {
 693                         start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
 694                         local_stats = *percpu_stats;
 695                 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
 696
 697                 stats->n_hit += local_stats.n_hit;
 698                 stats->n_missed += local_stats.n_missed;
 699                 stats->n_lost += local_stats.n_lost;
 700                 mega_stats->n_mask_hit += local_stats.n_mask_hit;
 701         }
 702 }
 703
 704 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
 705 {
 706         return ovs_identifier_is_ufid(sfid) &&
 707                !(ufid_flags & OVS_UFID_F_OMIT_KEY);
 708 }
 709
 710 static bool should_fill_mask(uint32_t ufid_flags)
 711 {
 712         return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
 713 }
 714
 715 static bool should_fill_actions(uint32_t ufid_flags)
 716 {
 717         return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
 718 }
 719
 720 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
 721                                     const struct sw_flow_id *sfid,
 722                                     uint32_t ufid_flags)
 723 {
 724         size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
 725
 726         /* OVS_FLOW_ATTR_UFID */
 727         if (sfid && ovs_identifier_is_ufid(sfid))
 728                 len += nla_total_size(sfid->ufid_len);
 729
 730         /* OVS_FLOW_ATTR_KEY */
 731         if (!sfid || should_fill_key(sfid, ufid_flags))
 732                 len += nla_total_size(ovs_key_attr_size());
 733
 734         /* OVS_FLOW_ATTR_MASK */
 735         if (should_fill_mask(ufid_flags))
 736                 len += nla_total_size(ovs_key_attr_size());
 737
 738         /* OVS_FLOW_ATTR_ACTIONS */
 739         if (should_fill_actions(ufid_flags))
 740                 len += nla_total_size(acts->orig_len);
 741
 742         return len
 743                 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
 744                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
 745                 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
 746 }
 747
 748 /* Called with ovs_mutex or RCU read lock. */
 749 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
 750                                    struct sk_buff *skb)
 751 {
 752         struct ovs_flow_stats stats;
 753         __be16 tcp_flags;
 754         unsigned long used;
 755
 756         ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
 757
 758         if (used &&
 759             nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
 760                               OVS_FLOW_ATTR_PAD))
 761                 return -EMSGSIZE;
 762
 763         if (stats.n_packets &&
 764             nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
 765                           sizeof(struct ovs_flow_stats), &stats,
 766                           OVS_FLOW_ATTR_PAD))
 767                 return -EMSGSIZE;
 768
 769         if ((u8)ntohs(tcp_flags) &&
 770              nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
 771                 return -EMSGSIZE;
 772
 773         return 0;
 774 }
 775
 776 /* Called with ovs_mutex or RCU read lock. */
 777 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
 778                                      struct sk_buff *skb, int skb_orig_len)
 779 {
 780         struct nlattr *start;
 781         int err;
 782
 783         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 784          * this is the first flow to be dumped into 'skb'.  This is unusual for
 785          * Netlink but individual action lists can be longer than
 786          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 787          * The userspace caller can always fetch the actions separately if it
 788          * really wants them.  (Most userspace callers in fact don't care.)
 789          *
 790          * This can only fail for dump operations because the skb is always
 791          * properly sized for single flows.
 792          */
 793         start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
 794         if (start) {
 795                 const struct sw_flow_actions *sf_acts;
 796
 797                 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
 798                 err = ovs_nla_put_actions(sf_acts->actions,
 799                                           sf_acts->actions_len, skb);
 800
 801                 if (!err)
 802                         nla_nest_end(skb, start);
 803                 else {
 804                         if (skb_orig_len)
 805                                 return err;
 806
 807                         nla_nest_cancel(skb, start);
 808                 }
 809         } else if (skb_orig_len) {
 810                 return -EMSGSIZE;
 811         }
 812
 813         return 0;
 814 }
 815
 816 /* Called with ovs_mutex or RCU read lock. */
 817 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
 818                                   struct sk_buff *skb, u32 portid,
 819                                   u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
 820 {
 821         const int skb_orig_len = skb->len;
 822         struct ovs_header *ovs_header;
 823         int err;
 824
 825         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
 826                                  flags, cmd);
 827         if (!ovs_header)
 828                 return -EMSGSIZE;
 829
 830         ovs_header->dp_ifindex = dp_ifindex;
 831
 832         err = ovs_nla_put_identifier(flow, skb);
 833         if (err)
 834                 goto error;
 835
 836         if (should_fill_key(&flow->id, ufid_flags)) {
 837                 err = ovs_nla_put_masked_key(flow, skb);
 838                 if (err)
 839                         goto error;
 840         }
 841
 842         if (should_fill_mask(ufid_flags)) {
 843                 err = ovs_nla_put_mask(flow, skb);
 844                 if (err)
 845                         goto error;
 846         }
 847
 848         err = ovs_flow_cmd_fill_stats(flow, skb);
 849         if (err)
 850                 goto error;
 851
 852         if (should_fill_actions(ufid_flags)) {
 853                 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
 854                 if (err)
 855                         goto error;
 856         }
 857
 858         genlmsg_end(skb, ovs_header);
 859         return 0;
 860
 861 error:
 862         genlmsg_cancel(skb, ovs_header);
 863         return err;
 864 }
 865
 866 /* May not be called with RCU read lock. */
 867 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
 868                                                const struct sw_flow_id *sfid,
 869                                                struct genl_info *info,
 870                                                bool always,
 871                                                uint32_t ufid_flags)
 872 {
 873         struct sk_buff *skb;
 874         size_t len;
 875
 876         if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
 877                 return NULL;
 878
 879         len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
 880         skb = genlmsg_new(len, GFP_KERNEL);
 881         if (!skb)
 882                 return ERR_PTR(-ENOMEM);
 883
 884         return skb;
 885 }
 886
 887 /* Called with ovs_mutex. */
 888 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
 889                                                int dp_ifindex,
 890                                                struct genl_info *info, u8 cmd,
 891                                                bool always, u32 ufid_flags)
 892 {
 893         struct sk_buff *skb;
 894         int retval;
 895
 896         skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
 897                                       &flow->id, info, always, ufid_flags);
 898         if (IS_ERR_OR_NULL(skb))
 899                 return skb;
 900
 901         retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
 902                                         info->snd_portid, info->snd_seq, 0,
 903                                         cmd, ufid_flags);
 904         BUG_ON(retval < 0);
 905         return skb;
 906 }
 907
 908 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
 909 {
 910         struct net *net = sock_net(skb->sk);
 911         struct nlattr **a = info->attrs;
 912         struct ovs_header *ovs_header = info->userhdr;
 913         struct sw_flow *flow = NULL, *new_flow;
 914         struct sw_flow_mask mask;
 915         struct sk_buff *reply;
 916         struct datapath *dp;
 917         struct sw_flow_actions *acts;
 918         struct sw_flow_match match;
 919         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
 920         int error;
 921         bool log = !a[OVS_FLOW_ATTR_PROBE];
 922
 923         /* Must have key and actions. */
 924         error = -EINVAL;
 925         if (!a[OVS_FLOW_ATTR_KEY]) {
 926                 OVS_NLERR(log, "Flow key attr not present in new flow.");
 927                 goto error;
 928         }
 929         if (!a[OVS_FLOW_ATTR_ACTIONS]) {
 930                 OVS_NLERR(log, "Flow actions attr not present in new flow.");
 931                 goto error;
 932         }
 933
 934         /* Most of the time we need to allocate a new flow, do it before
 935          * locking.
 936          */
 937         new_flow = ovs_flow_alloc();
 938         if (IS_ERR(new_flow)) {
 939                 error = PTR_ERR(new_flow);
 940                 goto error;
 941         }
 942
 943         /* Extract key. */
 944         ovs_match_init(&match, &new_flow->key, false, &mask);
 945         error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
 946                                   a[OVS_FLOW_ATTR_MASK], log);
 947         if (error)
 948                 goto err_kfree_flow;
 949
 950         /* Extract flow identifier. */
 951         error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
 952                                        &new_flow->key, log);
 953         if (error)
 954                 goto err_kfree_flow;
 955
 956         /* unmasked key is needed to match when ufid is not used. */
 957         if (ovs_identifier_is_key(&new_flow->id))
 958                 match.key = new_flow->id.unmasked_key;
 959
 960         ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
 961
 962         /* Validate actions. */
 963         error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
 964                                      &new_flow->key, &acts, log);
 965         if (error) {
 966                 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
 967                 goto err_kfree_flow;
 968         }
 969
 970         reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
 971                                         ufid_flags);
 972         if (IS_ERR(reply)) {
 973                 error = PTR_ERR(reply);
 974                 goto err_kfree_acts;
 975         }
 976
 977         ovs_lock();
 978         dp = get_dp(net, ovs_header->dp_ifindex);
 979         if (unlikely(!dp)) {
 980                 error = -ENODEV;
 981                 goto err_unlock_ovs;
 982         }
 983
 984         /* Check if this is a duplicate flow */
 985         if (ovs_identifier_is_ufid(&new_flow->id))
 986                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
 987         if (!flow)
 988                 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
 989         if (likely(!flow)) {
 990                 rcu_assign_pointer(new_flow->sf_acts, acts);
 991
 992                 /* Put flow in bucket. */
 993                 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
 994                 if (unlikely(error)) {
 995                         acts = NULL;
 996                         goto err_unlock_ovs;
 997                 }
 998
 999                 if (unlikely(reply)) {
1000                         error = ovs_flow_cmd_fill_info(new_flow,
1001                                                        ovs_header->dp_ifindex,
1002                                                        reply, info->snd_portid,
1003                                                        info->snd_seq, 0,
1004                                                        OVS_FLOW_CMD_NEW,
1005                                                        ufid_flags);
1006                         BUG_ON(error < 0);
1007                 }
1008                 ovs_unlock();
1009         } else {
1010                 struct sw_flow_actions *old_acts;
1011
1012                 /* Bail out if we're not allowed to modify an existing flow.
1013                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1014                  * because Generic Netlink treats the latter as a dump
1015                  * request.  We also accept NLM_F_EXCL in case that bug ever
1016                  * gets fixed.
1017                  */
1018                 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1019                                                          | NLM_F_EXCL))) {
1020                         error = -EEXIST;
1021                         goto err_unlock_ovs;
1022                 }
1023                 /* The flow identifier has to be the same for flow updates.
1024                  * Look for any overlapping flow.
1025                  */
1026                 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1027                         if (ovs_identifier_is_key(&flow->id))
1028                                 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1029                                                                  &match);
1030                         else /* UFID matches but key is different */
1031                                 flow = NULL;
1032                         if (!flow) {
1033                                 error = -ENOENT;
1034                                 goto err_unlock_ovs;
1035                         }
1036                 }
1037                 /* Update actions. */
1038                 old_acts = ovsl_dereference(flow->sf_acts);
1039                 rcu_assign_pointer(flow->sf_acts, acts);
1040
1041                 if (unlikely(reply)) {
1042                         error = ovs_flow_cmd_fill_info(flow,
1043                                                        ovs_header->dp_ifindex,
1044                                                        reply, info->snd_portid,
1045                                                        info->snd_seq, 0,
1046                                                        OVS_FLOW_CMD_NEW,
1047                                                        ufid_flags);
1048                         BUG_ON(error < 0);
1049                 }
1050                 ovs_unlock();
1051
1052                 ovs_nla_free_flow_actions_rcu(old_acts);
1053                 ovs_flow_free(new_flow, false);
1054         }
1055
1056         if (reply)
1057                 ovs_notify(&dp_flow_genl_family, reply, info);
1058         return 0;
1059
1060 err_unlock_ovs:
1061         ovs_unlock();
1062         kfree_skb(reply);
1063 err_kfree_acts:
1064         ovs_nla_free_flow_actions(acts);
1065 err_kfree_flow:
1066         ovs_flow_free(new_flow, false);
1067 error:
1068         return error;
1069 }
1070
1071 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1072 static struct sw_flow_actions *get_flow_actions(struct net *net,
1073                                                 const struct nlattr *a,
1074                                                 const struct sw_flow_key *key,
1075                                                 const struct sw_flow_mask *mask,
1076                                                 bool log)
1077 {
1078         struct sw_flow_actions *acts;
1079         struct sw_flow_key masked_key;
1080         int error;
1081
1082         ovs_flow_mask_key(&masked_key, key, true, mask);
1083         error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1084         if (error) {
1085                 OVS_NLERR(log,
1086                           "Actions may not be safe on all matching packets");
1087                 return ERR_PTR(error);
1088         }
1089
1090         return acts;
1091 }
1092
1093 /* Factor out match-init and action-copy to avoid
1094  * "Wframe-larger-than=1024" warning. Because mask is only
1095  * used to get actions, we new a function to save some
1096  * stack space.
1097  *
1098  * If there are not key and action attrs, we return 0
1099  * directly. In the case, the caller will also not use the
1100  * match as before. If there is action attr, we try to get
1101  * actions and save them to *acts. Before returning from
1102  * the function, we reset the match->mask pointer. Because
1103  * we should not to return match object with dangling reference
1104  * to mask.
1105  * */
1106 static int ovs_nla_init_match_and_action(struct net *net,
1107                                          struct sw_flow_match *match,
1108                                          struct sw_flow_key *key,
1109                                          struct nlattr **a,
1110                                          struct sw_flow_actions **acts,
1111                                          bool log)
1112 {
1113         struct sw_flow_mask mask;
1114         int error = 0;
1115
1116         if (a[OVS_FLOW_ATTR_KEY]) {
1117                 ovs_match_init(match, key, true, &mask);
1118                 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1119                                           a[OVS_FLOW_ATTR_MASK], log);
1120                 if (error)
1121                         goto error;
1122         }
1123
1124         if (a[OVS_FLOW_ATTR_ACTIONS]) {
1125                 if (!a[OVS_FLOW_ATTR_KEY]) {
1126                         OVS_NLERR(log,
1127                                   "Flow key attribute not present in set flow.");
1128                         return -EINVAL;
1129                 }
1130
1131                 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1132                                          &mask, log);
1133                 if (IS_ERR(*acts)) {
1134                         error = PTR_ERR(*acts);
1135                         goto error;
1136                 }
1137         }
1138
1139         /* On success, error is 0. */
1140 error:
1141         match->mask = NULL;
1142         return error;
1143 }
1144
1145 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1146 {
1147         struct net *net = sock_net(skb->sk);
1148         struct nlattr **a = info->attrs;
1149         struct ovs_header *ovs_header = info->userhdr;
1150         struct sw_flow_key key;
1151         struct sw_flow *flow;
1152         struct sk_buff *reply = NULL;
1153         struct datapath *dp;
1154         struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1155         struct sw_flow_match match;
1156         struct sw_flow_id sfid;
1157         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1158         int error = 0;
1159         bool log = !a[OVS_FLOW_ATTR_PROBE];
1160         bool ufid_present;
1161
1162         ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1163         if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1164                 OVS_NLERR(log,
1165                           "Flow set message rejected, Key attribute missing.");
1166                 return -EINVAL;
1167         }
1168
1169         error = ovs_nla_init_match_and_action(net, &match, &key, a,
1170                                               &acts, log);
1171         if (error)
1172                 goto error;
1173
1174         if (acts) {
1175                 /* Can allocate before locking if have acts. */
1176                 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1177                                                 ufid_flags);
1178                 if (IS_ERR(reply)) {
1179                         error = PTR_ERR(reply);
1180                         goto err_kfree_acts;
1181                 }
1182         }
1183
1184         ovs_lock();
1185         dp = get_dp(net, ovs_header->dp_ifindex);
1186         if (unlikely(!dp)) {
1187                 error = -ENODEV;
1188                 goto err_unlock_ovs;
1189         }
1190         /* Check that the flow exists. */
1191         if (ufid_present)
1192                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1193         else
1194                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1195         if (unlikely(!flow)) {
1196                 error = -ENOENT;
1197                 goto err_unlock_ovs;
1198         }
1199
1200         /* Update actions, if present. */
1201         if (likely(acts)) {
1202                 old_acts = ovsl_dereference(flow->sf_acts);
1203                 rcu_assign_pointer(flow->sf_acts, acts);
1204
1205                 if (unlikely(reply)) {
1206                         error = ovs_flow_cmd_fill_info(flow,
1207                                                        ovs_header->dp_ifindex,
1208                                                        reply, info->snd_portid,
1209                                                        info->snd_seq, 0,
1210                                                        OVS_FLOW_CMD_NEW,
1211                                                        ufid_flags);
1212                         BUG_ON(error < 0);
1213                 }
1214         } else {
1215                 /* Could not alloc without acts before locking. */
1216                 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1217                                                 info, OVS_FLOW_CMD_NEW, false,
1218                                                 ufid_flags);
1219
1220                 if (IS_ERR(reply)) {
1221                         error = PTR_ERR(reply);
1222                         goto err_unlock_ovs;
1223                 }
1224         }
1225
1226         /* Clear stats. */
1227         if (a[OVS_FLOW_ATTR_CLEAR])
1228                 ovs_flow_stats_clear(flow);
1229         ovs_unlock();
1230
1231         if (reply)
1232                 ovs_notify(&dp_flow_genl_family, reply, info);
1233         if (old_acts)
1234                 ovs_nla_free_flow_actions_rcu(old_acts);
1235
1236         return 0;
1237
1238 err_unlock_ovs:
1239         ovs_unlock();
1240         kfree_skb(reply);
1241 err_kfree_acts:
1242         ovs_nla_free_flow_actions(acts);
1243 error:
1244         return error;
1245 }
1246
1247 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1248 {
1249         struct nlattr **a = info->attrs;
1250         struct ovs_header *ovs_header = info->userhdr;
1251         struct net *net = sock_net(skb->sk);
1252         struct sw_flow_key key;
1253         struct sk_buff *reply;
1254         struct sw_flow *flow;
1255         struct datapath *dp;
1256         struct sw_flow_match match;
1257         struct sw_flow_id ufid;
1258         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1259         int err = 0;
1260         bool log = !a[OVS_FLOW_ATTR_PROBE];
1261         bool ufid_present;
1262
1263         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1264         if (a[OVS_FLOW_ATTR_KEY]) {
1265                 ovs_match_init(&match, &key, true, NULL);
1266                 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1267                                         log);
1268         } else if (!ufid_present) {
1269                 OVS_NLERR(log,
1270                           "Flow get message rejected, Key attribute missing.");
1271                 err = -EINVAL;
1272         }
1273         if (err)
1274                 return err;
1275
1276         ovs_lock();
1277         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1278         if (!dp) {
1279                 err = -ENODEV;
1280                 goto unlock;
1281         }
1282
1283         if (ufid_present)
1284                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1285         else
1286                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1287         if (!flow) {
1288                 err = -ENOENT;
1289                 goto unlock;
1290         }
1291
1292         reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1293                                         OVS_FLOW_CMD_NEW, true, ufid_flags);
1294         if (IS_ERR(reply)) {
1295                 err = PTR_ERR(reply);
1296                 goto unlock;
1297         }
1298
1299         ovs_unlock();
1300         return genlmsg_reply(reply, info);
1301 unlock:
1302         ovs_unlock();
1303         return err;
1304 }
1305
1306 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1307 {
1308         struct nlattr **a = info->attrs;
1309         struct ovs_header *ovs_header = info->userhdr;
1310         struct net *net = sock_net(skb->sk);
1311         struct sw_flow_key key;
1312         struct sk_buff *reply;
1313         struct sw_flow *flow = NULL;
1314         struct datapath *dp;
1315         struct sw_flow_match match;
1316         struct sw_flow_id ufid;
1317         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1318         int err;
1319         bool log = !a[OVS_FLOW_ATTR_PROBE];
1320         bool ufid_present;
1321
1322         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1323         if (a[OVS_FLOW_ATTR_KEY]) {
1324                 ovs_match_init(&match, &key, true, NULL);
1325                 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1326                                         NULL, log);
1327                 if (unlikely(err))
1328                         return err;
1329         }
1330
1331         ovs_lock();
1332         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1333         if (unlikely(!dp)) {
1334                 err = -ENODEV;
1335                 goto unlock;
1336         }
1337
1338         if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1339                 err = ovs_flow_tbl_flush(&dp->table);
1340                 goto unlock;
1341         }
1342
1343         if (ufid_present)
1344                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1345         else
1346                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1347         if (unlikely(!flow)) {
1348                 err = -ENOENT;
1349                 goto unlock;
1350         }
1351
1352         ovs_flow_tbl_remove(&dp->table, flow);
1353         ovs_unlock();
1354
1355         reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1356                                         &flow->id, info, false, ufid_flags);
1357         if (likely(reply)) {
1358                 if (likely(!IS_ERR(reply))) {
1359                         rcu_read_lock();        /*To keep RCU checker happy. */
1360                         err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1361                                                      reply, info->snd_portid,
1362                                                      info->snd_seq, 0,
1363                                                      OVS_FLOW_CMD_DEL,
1364                                                      ufid_flags);
1365                         rcu_read_unlock();
1366                         BUG_ON(err < 0);
1367
1368                         ovs_notify(&dp_flow_genl_family, reply, info);
1369                 } else {
1370                         netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1371                 }
1372         }
1373
1374         ovs_flow_free(flow, true);
1375         return 0;
1376 unlock:
1377         ovs_unlock();
1378         return err;
1379 }
1380
1381 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1382 {
1383         struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1384         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1385         struct table_instance *ti;
1386         struct datapath *dp;
1387         u32 ufid_flags;
1388         int err;
1389
1390         err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1391                             OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1392         if (err)
1393                 return err;
1394         ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1395
1396         rcu_read_lock();
1397         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1398         if (!dp) {
1399                 rcu_read_unlock();
1400                 return -ENODEV;
1401         }
1402
1403         ti = rcu_dereference(dp->table.ti);
1404         for (;;) {
1405                 struct sw_flow *flow;
1406                 u32 bucket, obj;
1407
1408                 bucket = cb->args[0];
1409                 obj = cb->args[1];
1410                 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1411                 if (!flow)
1412                         break;
1413
1414                 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1415                                            NETLINK_CB(cb->skb).portid,
1416                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1417                                            OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1418                         break;
1419
1420                 cb->args[0] = bucket;
1421                 cb->args[1] = obj;
1422         }
1423         rcu_read_unlock();
1424         return skb->len;
1425 }
1426
1427 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1428         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1429         [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1430         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1431         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1432         [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1433         [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1434         [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1435 };
1436
1437 static const struct genl_ops dp_flow_genl_ops[] = {
1438         { .cmd = OVS_FLOW_CMD_NEW,
1439           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1440           .policy = flow_policy,
1441           .doit = ovs_flow_cmd_new
1442         },
1443         { .cmd = OVS_FLOW_CMD_DEL,
1444           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1445           .policy = flow_policy,
1446           .doit = ovs_flow_cmd_del
1447         },
1448         { .cmd = OVS_FLOW_CMD_GET,
1449           .flags = 0,               /* OK for unprivileged users. */
1450           .policy = flow_policy,
1451           .doit = ovs_flow_cmd_get,
1452           .dumpit = ovs_flow_cmd_dump
1453         },
1454         { .cmd = OVS_FLOW_CMD_SET,
1455           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1456           .policy = flow_policy,
1457           .doit = ovs_flow_cmd_set,
1458         },
1459 };
1460
1461 static struct genl_family dp_flow_genl_family __ro_after_init = {
1462         .hdrsize = sizeof(struct ovs_header),
1463         .name = OVS_FLOW_FAMILY,
1464         .version = OVS_FLOW_VERSION,
1465         .maxattr = OVS_FLOW_ATTR_MAX,
1466         .netnsok = true,
1467         .parallel_ops = true,
1468         .ops = dp_flow_genl_ops,
1469         .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1470         .mcgrps = &ovs_dp_flow_multicast_group,
1471         .n_mcgrps = 1,
1472         .module = THIS_MODULE,
1473 };
1474
1475 static size_t ovs_dp_cmd_msg_size(void)
1476 {
1477         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1478
1479         msgsize += nla_total_size(IFNAMSIZ);
1480         msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1481         msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1482         msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1483
1484         return msgsize;
1485 }
1486
1487 /* Called with ovs_mutex. */
1488 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1489                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1490 {
1491         struct ovs_header *ovs_header;
1492         struct ovs_dp_stats dp_stats;
1493         struct ovs_dp_megaflow_stats dp_megaflow_stats;
1494         int err;
1495
1496         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1497                                    flags, cmd);
1498         if (!ovs_header)
1499                 goto error;
1500
1501         ovs_header->dp_ifindex = get_dpifindex(dp);
1502
1503         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1504         if (err)
1505                 goto nla_put_failure;
1506
1507         get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1508         if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1509                           &dp_stats, OVS_DP_ATTR_PAD))
1510                 goto nla_put_failure;
1511
1512         if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1513                           sizeof(struct ovs_dp_megaflow_stats),
1514                           &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1515                 goto nla_put_failure;
1516
1517         if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1518                 goto nla_put_failure;
1519
1520         genlmsg_end(skb, ovs_header);
1521         return 0;
1522
1523 nla_put_failure:
1524         genlmsg_cancel(skb, ovs_header);
1525 error:
1526         return -EMSGSIZE;
1527 }
1528
1529 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1530 {
1531         return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1532 }
1533
1534 /* Called with rcu_read_lock or ovs_mutex. */
1535 static struct datapath *lookup_datapath(struct net *net,
1536                                         const struct ovs_header *ovs_header,
1537                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1538 {
1539         struct datapath *dp;
1540
1541         if (!a[OVS_DP_ATTR_NAME])
1542                 dp = get_dp(net, ovs_header->dp_ifindex);
1543         else {
1544                 struct vport *vport;
1545
1546                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1547                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1548         }
1549         return dp ? dp : ERR_PTR(-ENODEV);
1550 }
1551
1552 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1553 {
1554         struct datapath *dp;
1555
1556         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1557         if (IS_ERR(dp))
1558                 return;
1559
1560         WARN(dp->user_features, "Dropping previously announced user features\n");
1561         dp->user_features = 0;
1562 }
1563
1564 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1565 {
1566         if (a[OVS_DP_ATTR_USER_FEATURES])
1567                 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1568 }
1569
1570 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1571 {
1572         struct nlattr **a = info->attrs;
1573         struct vport_parms parms;
1574         struct sk_buff *reply;
1575         struct datapath *dp;
1576         struct vport *vport;
1577         struct ovs_net *ovs_net;
1578         int err, i;
1579
1580         err = -EINVAL;
1581         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1582                 goto err;
1583
1584         reply = ovs_dp_cmd_alloc_info();
1585         if (!reply)
1586                 return -ENOMEM;
1587
1588         err = -ENOMEM;
1589         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1590         if (dp == NULL)
1591                 goto err_free_reply;
1592
1593         ovs_dp_set_net(dp, sock_net(skb->sk));
1594
1595         /* Allocate table. */
1596         err = ovs_flow_tbl_init(&dp->table);
1597         if (err)
1598                 goto err_free_dp;
1599
1600         dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1601         if (!dp->stats_percpu) {
1602                 err = -ENOMEM;
1603                 goto err_destroy_table;
1604         }
1605
1606         dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1607                             GFP_KERNEL);
1608         if (!dp->ports) {
1609                 err = -ENOMEM;
1610                 goto err_destroy_percpu;
1611         }
1612
1613         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1614                 INIT_HLIST_HEAD(&dp->ports[i]);
1615
1616         /* Set up our datapath device. */
1617         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1618         parms.type = OVS_VPORT_TYPE_INTERNAL;
1619         parms.options = NULL;
1620         parms.dp = dp;
1621         parms.port_no = OVSP_LOCAL;
1622         parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1623
1624         ovs_dp_change(dp, a);
1625
1626         /* So far only local changes have been made, now need the lock. */
1627         ovs_lock();
1628
1629         vport = new_vport(&parms);
1630         if (IS_ERR(vport)) {
1631                 err = PTR_ERR(vport);
1632                 if (err == -EBUSY)
1633                         err = -EEXIST;
1634
1635                 if (err == -EEXIST) {
1636                         /* An outdated user space instance that does not understand
1637                          * the concept of user_features has attempted to create a new
1638                          * datapath and is likely to reuse it. Drop all user features.
1639                          */
1640                         if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1641                                 ovs_dp_reset_user_features(skb, info);
1642                 }
1643
1644                 goto err_destroy_ports_array;
1645         }
1646
1647         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1648                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1649         BUG_ON(err < 0);
1650
1651         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1652         list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1653
1654         ovs_unlock();
1655
1656         ovs_notify(&dp_datapath_genl_family, reply, info);
1657         return 0;
1658
1659 err_destroy_ports_array:
1660         ovs_unlock();
1661         kfree(dp->ports);
1662 err_destroy_percpu:
1663         free_percpu(dp->stats_percpu);
1664 err_destroy_table:
1665         ovs_flow_tbl_destroy(&dp->table);
1666 err_free_dp:
1667         kfree(dp);
1668 err_free_reply:
1669         kfree_skb(reply);
1670 err:
1671         return err;
1672 }
1673
1674 /* Called with ovs_mutex. */
1675 static void __dp_destroy(struct datapath *dp)
1676 {
1677         int i;
1678
1679         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1680                 struct vport *vport;
1681                 struct hlist_node *n;
1682
1683                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1684                         if (vport->port_no != OVSP_LOCAL)
1685                                 ovs_dp_detach_port(vport);
1686         }
1687
1688         list_del_rcu(&dp->list_node);
1689
1690         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1691          * all ports in datapath are destroyed first before freeing datapath.
1692          */
1693         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1694
1695         /* RCU destroy the flow table */
1696         call_rcu(&dp->rcu, destroy_dp_rcu);
1697 }
1698
1699 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1700 {
1701         struct sk_buff *reply;
1702         struct datapath *dp;
1703         int err;
1704
1705         reply = ovs_dp_cmd_alloc_info();
1706         if (!reply)
1707                 return -ENOMEM;
1708
1709         ovs_lock();
1710         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1711         err = PTR_ERR(dp);
1712         if (IS_ERR(dp))
1713                 goto err_unlock_free;
1714
1715         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1716                                    info->snd_seq, 0, OVS_DP_CMD_DEL);
1717         BUG_ON(err < 0);
1718
1719         __dp_destroy(dp);
1720         ovs_unlock();
1721
1722         ovs_notify(&dp_datapath_genl_family, reply, info);
1723
1724         return 0;
1725
1726 err_unlock_free:
1727         ovs_unlock();
1728         kfree_skb(reply);
1729         return err;
1730 }
1731
1732 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1733 {
1734         struct sk_buff *reply;
1735         struct datapath *dp;
1736         int err;
1737
1738         reply = ovs_dp_cmd_alloc_info();
1739         if (!reply)
1740                 return -ENOMEM;
1741
1742         ovs_lock();
1743         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1744         err = PTR_ERR(dp);
1745         if (IS_ERR(dp))
1746                 goto err_unlock_free;
1747
1748         ovs_dp_change(dp, info->attrs);
1749
1750         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1751                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1752         BUG_ON(err < 0);
1753
1754         ovs_unlock();
1755         ovs_notify(&dp_datapath_genl_family, reply, info);
1756
1757         return 0;
1758
1759 err_unlock_free:
1760         ovs_unlock();
1761         kfree_skb(reply);
1762         return err;
1763 }
1764
1765 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1766 {
1767         struct sk_buff *reply;
1768         struct datapath *dp;
1769         int err;
1770
1771         reply = ovs_dp_cmd_alloc_info();
1772         if (!reply)
1773                 return -ENOMEM;
1774
1775         ovs_lock();
1776         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1777         if (IS_ERR(dp)) {
1778                 err = PTR_ERR(dp);
1779                 goto err_unlock_free;
1780         }
1781         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1782                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1783         BUG_ON(err < 0);
1784         ovs_unlock();
1785
1786         return genlmsg_reply(reply, info);
1787
1788 err_unlock_free:
1789         ovs_unlock();
1790         kfree_skb(reply);
1791         return err;
1792 }
1793
1794 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1795 {
1796         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1797         struct datapath *dp;
1798         int skip = cb->args[0];
1799         int i = 0;
1800
1801         ovs_lock();
1802         list_for_each_entry(dp, &ovs_net->dps, list_node) {
1803                 if (i >= skip &&
1804                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1805                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1806                                          OVS_DP_CMD_NEW) < 0)
1807                         break;
1808                 i++;
1809         }
1810         ovs_unlock();
1811
1812         cb->args[0] = i;
1813
1814         return skb->len;
1815 }
1816
1817 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1818         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1819         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1820         [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1821 };
1822
1823 static const struct genl_ops dp_datapath_genl_ops[] = {
1824         { .cmd = OVS_DP_CMD_NEW,
1825           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1826           .policy = datapath_policy,
1827           .doit = ovs_dp_cmd_new
1828         },
1829         { .cmd = OVS_DP_CMD_DEL,
1830           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1831           .policy = datapath_policy,
1832           .doit = ovs_dp_cmd_del
1833         },
1834         { .cmd = OVS_DP_CMD_GET,
1835           .flags = 0,               /* OK for unprivileged users. */
1836           .policy = datapath_policy,
1837           .doit = ovs_dp_cmd_get,
1838           .dumpit = ovs_dp_cmd_dump
1839         },
1840         { .cmd = OVS_DP_CMD_SET,
1841           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1842           .policy = datapath_policy,
1843           .doit = ovs_dp_cmd_set,
1844         },
1845 };
1846
1847 static struct genl_family dp_datapath_genl_family __ro_after_init = {
1848         .hdrsize = sizeof(struct ovs_header),
1849         .name = OVS_DATAPATH_FAMILY,
1850         .version = OVS_DATAPATH_VERSION,
1851         .maxattr = OVS_DP_ATTR_MAX,
1852         .netnsok = true,
1853         .parallel_ops = true,
1854         .ops = dp_datapath_genl_ops,
1855         .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1856         .mcgrps = &ovs_dp_datapath_multicast_group,
1857         .n_mcgrps = 1,
1858         .module = THIS_MODULE,
1859 };
1860
1861 /* Called with ovs_mutex or RCU read lock. */
1862 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1863                                    u32 portid, u32 seq, u32 flags, u8 cmd)
1864 {
1865         struct ovs_header *ovs_header;
1866         struct ovs_vport_stats vport_stats;
1867         int err;
1868
1869         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1870                                  flags, cmd);
1871         if (!ovs_header)
1872                 return -EMSGSIZE;
1873
1874         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1875
1876         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1877             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1878             nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1879                            ovs_vport_name(vport)))
1880                 goto nla_put_failure;
1881
1882         ovs_vport_get_stats(vport, &vport_stats);
1883         if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
1884                           sizeof(struct ovs_vport_stats), &vport_stats,
1885                           OVS_VPORT_ATTR_PAD))
1886                 goto nla_put_failure;
1887
1888         if (ovs_vport_get_upcall_portids(vport, skb))
1889                 goto nla_put_failure;
1890
1891         err = ovs_vport_get_options(vport, skb);
1892         if (err == -EMSGSIZE)
1893                 goto error;
1894
1895         genlmsg_end(skb, ovs_header);
1896         return 0;
1897
1898 nla_put_failure:
1899         err = -EMSGSIZE;
1900 error:
1901         genlmsg_cancel(skb, ovs_header);
1902         return err;
1903 }
1904
1905 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1906 {
1907         return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1908 }
1909
1910 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1911 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1912                                          u32 seq, u8 cmd)
1913 {
1914         struct sk_buff *skb;
1915         int retval;
1916
1917         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1918         if (!skb)
1919                 return ERR_PTR(-ENOMEM);
1920
1921         retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1922         BUG_ON(retval < 0);
1923
1924         return skb;
1925 }
1926
1927 /* Called with ovs_mutex or RCU read lock. */
1928 static struct vport *lookup_vport(struct net *net,
1929                                   const struct ovs_header *ovs_header,
1930                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1931 {
1932         struct datapath *dp;
1933         struct vport *vport;
1934
1935         if (a[OVS_VPORT_ATTR_NAME]) {
1936                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1937                 if (!vport)
1938                         return ERR_PTR(-ENODEV);
1939                 if (ovs_header->dp_ifindex &&
1940                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1941                         return ERR_PTR(-ENODEV);
1942                 return vport;
1943         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1944                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1945
1946                 if (port_no >= DP_MAX_PORTS)
1947                         return ERR_PTR(-EFBIG);
1948
1949                 dp = get_dp(net, ovs_header->dp_ifindex);
1950                 if (!dp)
1951                         return ERR_PTR(-ENODEV);
1952
1953                 vport = ovs_vport_ovsl_rcu(dp, port_no);
1954                 if (!vport)
1955                         return ERR_PTR(-ENODEV);
1956                 return vport;
1957         } else
1958                 return ERR_PTR(-EINVAL);
1959 }
1960
1961 /* Called with ovs_mutex */
1962 static void update_headroom(struct datapath *dp)
1963 {
1964         unsigned dev_headroom, max_headroom = 0;
1965         struct net_device *dev;
1966         struct vport *vport;
1967         int i;
1968
1969         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1970                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1971                         dev = vport->dev;
1972                         dev_headroom = netdev_get_fwd_headroom(dev);
1973                         if (dev_headroom > max_headroom)
1974                                 max_headroom = dev_headroom;
1975                 }
1976         }
1977
1978         dp->max_headroom = max_headroom;
1979         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1980                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
1981                         netdev_set_rx_headroom(vport->dev, max_headroom);
1982 }
1983
1984 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1985 {
1986         struct nlattr **a = info->attrs;
1987         struct ovs_header *ovs_header = info->userhdr;
1988         struct vport_parms parms;
1989         struct sk_buff *reply;
1990         struct vport *vport;
1991         struct datapath *dp;
1992         u32 port_no;
1993         int err;
1994
1995         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1996             !a[OVS_VPORT_ATTR_UPCALL_PID])
1997                 return -EINVAL;
1998
1999         port_no = a[OVS_VPORT_ATTR_PORT_NO]
2000                 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2001         if (port_no >= DP_MAX_PORTS)
2002                 return -EFBIG;
2003
2004         reply = ovs_vport_cmd_alloc_info();
2005         if (!reply)
2006                 return -ENOMEM;
2007
2008         ovs_lock();
2009 restart:
2010         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2011         err = -ENODEV;
2012         if (!dp)
2013                 goto exit_unlock_free;
2014
2015         if (port_no) {
2016                 vport = ovs_vport_ovsl(dp, port_no);
2017                 err = -EBUSY;
2018                 if (vport)
2019                         goto exit_unlock_free;
2020         } else {
2021                 for (port_no = 1; ; port_no++) {
2022                         if (port_no >= DP_MAX_PORTS) {
2023                                 err = -EFBIG;
2024                                 goto exit_unlock_free;
2025                         }
2026                         vport = ovs_vport_ovsl(dp, port_no);
2027                         if (!vport)
2028                                 break;
2029                 }
2030         }
2031
2032         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2033         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2034         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2035         parms.dp = dp;
2036         parms.port_no = port_no;
2037         parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2038
2039         vport = new_vport(&parms);
2040         err = PTR_ERR(vport);
2041         if (IS_ERR(vport)) {
2042                 if (err == -EAGAIN)
2043                         goto restart;
2044                 goto exit_unlock_free;
2045         }
2046
2047         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2048                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2049
2050         if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom)
2051                 update_headroom(dp);
2052         else
2053                 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2054
2055         BUG_ON(err < 0);
2056         ovs_unlock();
2057
2058         ovs_notify(&dp_vport_genl_family, reply, info);
2059         return 0;
2060
2061 exit_unlock_free:
2062         ovs_unlock();
2063         kfree_skb(reply);
2064         return err;
2065 }
2066
2067 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2068 {
2069         struct nlattr **a = info->attrs;
2070         struct sk_buff *reply;
2071         struct vport *vport;
2072         int err;
2073
2074         reply = ovs_vport_cmd_alloc_info();
2075         if (!reply)
2076                 return -ENOMEM;
2077
2078         ovs_lock();
2079         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2080         err = PTR_ERR(vport);
2081         if (IS_ERR(vport))
2082                 goto exit_unlock_free;
2083
2084         if (a[OVS_VPORT_ATTR_TYPE] &&
2085             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2086                 err = -EINVAL;
2087                 goto exit_unlock_free;
2088         }
2089
2090         if (a[OVS_VPORT_ATTR_OPTIONS]) {
2091                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2092                 if (err)
2093                         goto exit_unlock_free;
2094         }
2095
2096
2097         if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2098                 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2099
2100                 err = ovs_vport_set_upcall_portids(vport, ids);
2101                 if (err)
2102                         goto exit_unlock_free;
2103         }
2104
2105         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2106                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2107         BUG_ON(err < 0);
2108
2109         ovs_unlock();
2110         ovs_notify(&dp_vport_genl_family, reply, info);
2111         return 0;
2112
2113 exit_unlock_free:
2114         ovs_unlock();
2115         kfree_skb(reply);
2116         return err;
2117 }
2118
2119 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2120 {
2121         bool must_update_headroom = false;
2122         struct nlattr **a = info->attrs;
2123         struct sk_buff *reply;
2124         struct datapath *dp;
2125         struct vport *vport;
2126         int err;
2127
2128         reply = ovs_vport_cmd_alloc_info();
2129         if (!reply)
2130                 return -ENOMEM;
2131
2132         ovs_lock();
2133         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2134         err = PTR_ERR(vport);
2135         if (IS_ERR(vport))
2136                 goto exit_unlock_free;
2137
2138         if (vport->port_no == OVSP_LOCAL) {
2139                 err = -EINVAL;
2140                 goto exit_unlock_free;
2141         }
2142
2143         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2144                                       info->snd_seq, 0, OVS_VPORT_CMD_DEL);
2145         BUG_ON(err < 0);
2146
2147         /* the vport deletion may trigger dp headroom update */
2148         dp = vport->dp;
2149         if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2150                 must_update_headroom = true;
2151         netdev_reset_rx_headroom(vport->dev);
2152         ovs_dp_detach_port(vport);
2153
2154         if (must_update_headroom)
2155                 update_headroom(dp);
2156         ovs_unlock();
2157
2158         ovs_notify(&dp_vport_genl_family, reply, info);
2159         return 0;
2160
2161 exit_unlock_free:
2162         ovs_unlock();
2163         kfree_skb(reply);
2164         return err;
2165 }
2166
2167 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2168 {
2169         struct nlattr **a = info->attrs;
2170         struct ovs_header *ovs_header = info->userhdr;
2171         struct sk_buff *reply;
2172         struct vport *vport;
2173         int err;
2174
2175         reply = ovs_vport_cmd_alloc_info();
2176         if (!reply)
2177                 return -ENOMEM;
2178
2179         rcu_read_lock();
2180         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2181         err = PTR_ERR(vport);
2182         if (IS_ERR(vport))
2183                 goto exit_unlock_free;
2184         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2185                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2186         BUG_ON(err < 0);
2187         rcu_read_unlock();
2188
2189         return genlmsg_reply(reply, info);
2190
2191 exit_unlock_free:
2192         rcu_read_unlock();
2193         kfree_skb(reply);
2194         return err;
2195 }
2196
2197 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2198 {
2199         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2200         struct datapath *dp;
2201         int bucket = cb->args[0], skip = cb->args[1];
2202         int i, j = 0;
2203
2204         rcu_read_lock();
2205         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2206         if (!dp) {
2207                 rcu_read_unlock();
2208                 return -ENODEV;
2209         }
2210         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2211                 struct vport *vport;
2212
2213                 j = 0;
2214                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2215                         if (j >= skip &&
2216                             ovs_vport_cmd_fill_info(vport, skb,
2217                                                     NETLINK_CB(cb->skb).portid,
2218                                                     cb->nlh->nlmsg_seq,
2219                                                     NLM_F_MULTI,
2220                                                     OVS_VPORT_CMD_NEW) < 0)
2221                                 goto out;
2222
2223                         j++;
2224                 }
2225                 skip = 0;
2226         }
2227 out:
2228         rcu_read_unlock();
2229
2230         cb->args[0] = i;
2231         cb->args[1] = j;
2232
2233         return skb->len;
2234 }
2235
2236 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2237         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2238         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2239         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2240         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2241         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2242         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2243 };
2244
2245 static const struct genl_ops dp_vport_genl_ops[] = {
2246         { .cmd = OVS_VPORT_CMD_NEW,
2247           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2248           .policy = vport_policy,
2249           .doit = ovs_vport_cmd_new
2250         },
2251         { .cmd = OVS_VPORT_CMD_DEL,
2252           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2253           .policy = vport_policy,
2254           .doit = ovs_vport_cmd_del
2255         },
2256         { .cmd = OVS_VPORT_CMD_GET,
2257           .flags = 0,               /* OK for unprivileged users. */
2258           .policy = vport_policy,
2259           .doit = ovs_vport_cmd_get,
2260           .dumpit = ovs_vport_cmd_dump
2261         },
2262         { .cmd = OVS_VPORT_CMD_SET,
2263           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2264           .policy = vport_policy,
2265           .doit = ovs_vport_cmd_set,
2266         },
2267 };
2268
2269 struct genl_family dp_vport_genl_family __ro_after_init = {
2270         .hdrsize = sizeof(struct ovs_header),
2271         .name = OVS_VPORT_FAMILY,
2272         .version = OVS_VPORT_VERSION,
2273         .maxattr = OVS_VPORT_ATTR_MAX,
2274         .netnsok = true,
2275         .parallel_ops = true,
2276         .ops = dp_vport_genl_ops,
2277         .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2278         .mcgrps = &ovs_dp_vport_multicast_group,
2279         .n_mcgrps = 1,
2280         .module = THIS_MODULE,
2281 };
2282
2283 static struct genl_family * const dp_genl_families[] = {
2284         &dp_datapath_genl_family,
2285         &dp_vport_genl_family,
2286         &dp_flow_genl_family,
2287         &dp_packet_genl_family,
2288 };
2289
2290 static void dp_unregister_genl(int n_families)
2291 {
2292         int i;
2293
2294         for (i = 0; i < n_families; i++)
2295                 genl_unregister_family(dp_genl_families[i]);
2296 }
2297
2298 static int __init dp_register_genl(void)
2299 {
2300         int err;
2301         int i;
2302
2303         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2304
2305                 err = genl_register_family(dp_genl_families[i]);
2306                 if (err)
2307                         goto error;
2308         }
2309
2310         return 0;
2311
2312 error:
2313         dp_unregister_genl(i);
2314         return err;
2315 }
2316
2317 static int __net_init ovs_init_net(struct net *net)
2318 {
2319         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2320
2321         INIT_LIST_HEAD(&ovs_net->dps);
2322         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2323         ovs_ct_init(net);
2324         return 0;
2325 }
2326
2327 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2328                                             struct list_head *head)
2329 {
2330         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2331         struct datapath *dp;
2332
2333         list_for_each_entry(dp, &ovs_net->dps, list_node) {
2334                 int i;
2335
2336                 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2337                         struct vport *vport;
2338
2339                         hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2340                                 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2341                                         continue;
2342
2343                                 if (dev_net(vport->dev) == dnet)
2344                                         list_add(&vport->detach_list, head);
2345                         }
2346                 }
2347         }
2348 }
2349
2350 static void __net_exit ovs_exit_net(struct net *dnet)
2351 {
2352         struct datapath *dp, *dp_next;
2353         struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2354         struct vport *vport, *vport_next;
2355         struct net *net;
2356         LIST_HEAD(head);
2357
2358         ovs_ct_exit(dnet);
2359         ovs_lock();
2360         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2361                 __dp_destroy(dp);
2362
2363         rtnl_lock();
2364         for_each_net(net)
2365                 list_vports_from_net(net, dnet, &head);
2366         rtnl_unlock();
2367
2368         /* Detach all vports from given namespace. */
2369         list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2370                 list_del(&vport->detach_list);
2371                 ovs_dp_detach_port(vport);
2372         }
2373
2374         ovs_unlock();
2375
2376         cancel_work_sync(&ovs_net->dp_notify_work);
2377 }
2378
2379 static struct pernet_operations ovs_net_ops = {
2380         .init = ovs_init_net,
2381         .exit = ovs_exit_net,
2382         .id   = &ovs_net_id,
2383         .size = sizeof(struct ovs_net),
2384 };
2385
2386 static int __init dp_init(void)
2387 {
2388         int err;
2389
2390         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2391
2392         pr_info("Open vSwitch switching datapath\n");
2393
2394         err = action_fifos_init();
2395         if (err)
2396                 goto error;
2397
2398         err = ovs_internal_dev_rtnl_link_register();
2399         if (err)
2400                 goto error_action_fifos_exit;
2401
2402         err = ovs_flow_init();
2403         if (err)
2404                 goto error_unreg_rtnl_link;
2405
2406         err = ovs_vport_init();
2407         if (err)
2408                 goto error_flow_exit;
2409
2410         err = register_pernet_device(&ovs_net_ops);
2411         if (err)
2412                 goto error_vport_exit;
2413
2414         err = register_netdevice_notifier(&ovs_dp_device_notifier);
2415         if (err)
2416                 goto error_netns_exit;
2417
2418         err = ovs_netdev_init();
2419         if (err)
2420                 goto error_unreg_notifier;
2421
2422         err = dp_register_genl();
2423         if (err < 0)
2424                 goto error_unreg_netdev;
2425
2426         return 0;
2427
2428 error_unreg_netdev:
2429         ovs_netdev_exit();
2430 error_unreg_notifier:
2431         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2432 error_netns_exit:
2433         unregister_pernet_device(&ovs_net_ops);
2434 error_vport_exit:
2435         ovs_vport_exit();
2436 error_flow_exit:
2437         ovs_flow_exit();
2438 error_unreg_rtnl_link:
2439         ovs_internal_dev_rtnl_link_unregister();
2440 error_action_fifos_exit:
2441         action_fifos_exit();
2442 error:
2443         return err;
2444 }
2445
2446 static void dp_cleanup(void)
2447 {
2448         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2449         ovs_netdev_exit();
2450         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2451         unregister_pernet_device(&ovs_net_ops);
2452         rcu_barrier();
2453         ovs_vport_exit();
2454         ovs_flow_exit();
2455         ovs_internal_dev_rtnl_link_unregister();
2456         action_fifos_exit();
2457 }
2458
2459 module_init(dp_init);
2460 module_exit(dp_cleanup);
2461
2462 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2463 MODULE_LICENSE("GPL");
2464 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2465 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2466 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2467 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);