datapath/datapath.c

   1 /*
   2  * Copyright (c) 2007-2013 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/version.h>
  40 #include <linux/ethtool.h>
  41 #include <linux/wait.h>
  42 #include <asm/div64.h>
  43 #include <linux/highmem.h>
  44 #include <linux/netfilter_bridge.h>
  45 #include <linux/netfilter_ipv4.h>
  46 #include <linux/inetdevice.h>
  47 #include <linux/list.h>
  48 #include <linux/openvswitch.h>
  49 #include <linux/rculist.h>
  50 #include <linux/dmi.h>
  51 #include <linux/genetlink.h>
  52 #include <net/genetlink.h>
  53 #include <net/genetlink.h>
  54 #include <net/net_namespace.h>
  55 #include <net/netns/generic.h>
  56
  57 #include "datapath.h"
  58 #include "flow.h"
  59 #include "flow_netlink.h"
  60 #include "vlan.h"
  61 #include "vport-internal_dev.h"
  62 #include "vport-netdev.h"
  63
  64 int ovs_net_id __read_mostly;
  65
  66 static void ovs_notify(struct sk_buff *skb, struct genl_info *info,
  67                        struct genl_multicast_group *grp)
  68 {
  69         genl_notify(skb, genl_info_net(info), info->snd_portid,
  70                     grp->id, info->nlhdr, GFP_KERNEL);
  71 }
  72
  73 /**
  74  * DOC: Locking:
  75  *
  76  * All writes e.g. Writes to device state (add/remove datapath, port, set
  77  * operations on vports, etc.), Writes to other state (flow table
  78  * modifications, set miscellaneous datapath parameters, etc.) are protected
  79  * by ovs_lock.
  80  *
  81  * Reads are protected by RCU.
  82  *
  83  * There are a few special cases (mostly stats) that have their own
  84  * synchronization but they nest under all of above and don't interact with
  85  * each other.
  86  *
  87  * The RTNL lock nests inside ovs_mutex.
  88  */
  89
  90 static DEFINE_MUTEX(ovs_mutex);
  91
  92 void ovs_lock(void)
  93 {
  94         mutex_lock(&ovs_mutex);
  95 }
  96
  97 void ovs_unlock(void)
  98 {
  99         mutex_unlock(&ovs_mutex);
 100 }
 101
 102 #ifdef CONFIG_LOCKDEP
 103 int lockdep_ovsl_is_held(void)
 104 {
 105         if (debug_locks)
 106                 return lockdep_is_held(&ovs_mutex);
 107         else
 108                 return 1;
 109 }
 110 #endif
 111
 112 static struct vport *new_vport(const struct vport_parms *);
 113 static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *,
 114                              const struct dp_upcall_info *);
 115 static int queue_userspace_packet(struct net *, int dp_ifindex,
 116                                   struct sk_buff *,
 117                                   const struct dp_upcall_info *);
 118
 119 /* Must be called with rcu_read_lock or ovs_mutex. */
 120 static struct datapath *get_dp(struct net *net, int dp_ifindex)
 121 {
 122         struct datapath *dp = NULL;
 123         struct net_device *dev;
 124
 125         rcu_read_lock();
 126         dev = dev_get_by_index_rcu(net, dp_ifindex);
 127         if (dev) {
 128                 struct vport *vport = ovs_internal_dev_get_vport(dev);
 129                 if (vport)
 130                         dp = vport->dp;
 131         }
 132         rcu_read_unlock();
 133
 134         return dp;
 135 }
 136
 137 /* Must be called with rcu_read_lock or ovs_mutex. */
 138 const char *ovs_dp_name(const struct datapath *dp)
 139 {
 140         struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
 141         return vport->ops->get_name(vport);
 142 }
 143
 144 static int get_dpifindex(struct datapath *dp)
 145 {
 146         struct vport *local;
 147         int ifindex;
 148
 149         rcu_read_lock();
 150
 151         local = ovs_vport_rcu(dp, OVSP_LOCAL);
 152         if (local)
 153                 ifindex = netdev_vport_priv(local)->dev->ifindex;
 154         else
 155                 ifindex = 0;
 156
 157         rcu_read_unlock();
 158
 159         return ifindex;
 160 }
 161
 162 static void destroy_dp_rcu(struct rcu_head *rcu)
 163 {
 164         struct datapath *dp = container_of(rcu, struct datapath, rcu);
 165
 166         ovs_flow_tbl_destroy(&dp->table);
 167         free_percpu(dp->stats_percpu);
 168         release_net(ovs_dp_get_net(dp));
 169         kfree(dp->ports);
 170         kfree(dp);
 171 }
 172
 173 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
 174                                             u16 port_no)
 175 {
 176         return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
 177 }
 178
 179 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
 180 {
 181         struct vport *vport;
 182         struct hlist_head *head;
 183
 184         head = vport_hash_bucket(dp, port_no);
 185         hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
 186                 if (vport->port_no == port_no)
 187                         return vport;
 188         }
 189         return NULL;
 190 }
 191
 192 /* Called with ovs_mutex. */
 193 static struct vport *new_vport(const struct vport_parms *parms)
 194 {
 195         struct vport *vport;
 196
 197         vport = ovs_vport_add(parms);
 198         if (!IS_ERR(vport)) {
 199                 struct datapath *dp = parms->dp;
 200                 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
 201
 202                 hlist_add_head_rcu(&vport->dp_hash_node, head);
 203         }
 204         return vport;
 205 }
 206
 207 void ovs_dp_detach_port(struct vport *p)
 208 {
 209         ASSERT_OVSL();
 210
 211         /* First drop references to device. */
 212         hlist_del_rcu(&p->dp_hash_node);
 213
 214         /* Then destroy it. */
 215         ovs_vport_del(p);
 216 }
 217
 218 /* Must be called with rcu_read_lock. */
 219 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
 220 {
 221         struct datapath *dp = p->dp;
 222         struct sw_flow *flow;
 223         struct dp_stats_percpu *stats;
 224         struct sw_flow_key key;
 225         u64 *stats_counter;
 226         int error;
 227
 228         stats = this_cpu_ptr(dp->stats_percpu);
 229
 230         /* Extract flow from 'skb' into 'key'. */
 231         error = ovs_flow_extract(skb, p->port_no, &key);
 232         if (unlikely(error)) {
 233                 kfree_skb(skb);
 234                 return;
 235         }
 236
 237         /* Look up flow. */
 238         flow = ovs_flow_tbl_lookup(&dp->table, &key);
 239         if (unlikely(!flow)) {
 240                 struct dp_upcall_info upcall;
 241
 242                 upcall.cmd = OVS_PACKET_CMD_MISS;
 243                 upcall.key = &key;
 244                 upcall.userdata = NULL;
 245                 upcall.portid = p->upcall_portid;
 246                 ovs_dp_upcall(dp, skb, &upcall);
 247                 consume_skb(skb);
 248                 stats_counter = &stats->n_missed;
 249                 goto out;
 250         }
 251
 252         OVS_CB(skb)->flow = flow;
 253         OVS_CB(skb)->pkt_key = &key;
 254
 255         stats_counter = &stats->n_hit;
 256         ovs_flow_used(OVS_CB(skb)->flow, skb);
 257         ovs_execute_actions(dp, skb);
 258
 259 out:
 260         /* Update datapath statistics. */
 261         u64_stats_update_begin(&stats->sync);
 262         (*stats_counter)++;
 263         u64_stats_update_end(&stats->sync);
 264 }
 265
 266 static struct genl_family dp_packet_genl_family = {
 267         .id = GENL_ID_GENERATE,
 268         .hdrsize = sizeof(struct ovs_header),
 269         .name = OVS_PACKET_FAMILY,
 270         .version = OVS_PACKET_VERSION,
 271         .maxattr = OVS_PACKET_ATTR_MAX,
 272         .netnsok = true,
 273          SET_PARALLEL_OPS
 274 };
 275
 276 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
 277                   const struct dp_upcall_info *upcall_info)
 278 {
 279         struct dp_stats_percpu *stats;
 280         int dp_ifindex;
 281         int err;
 282
 283         if (upcall_info->portid == 0) {
 284                 err = -ENOTCONN;
 285                 goto err;
 286         }
 287
 288         dp_ifindex = get_dpifindex(dp);
 289         if (!dp_ifindex) {
 290                 err = -ENODEV;
 291                 goto err;
 292         }
 293
 294         if (!skb_is_gso(skb))
 295                 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
 296         else
 297                 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
 298         if (err)
 299                 goto err;
 300
 301         return 0;
 302
 303 err:
 304         stats = this_cpu_ptr(dp->stats_percpu);
 305
 306         u64_stats_update_begin(&stats->sync);
 307         stats->n_lost++;
 308         u64_stats_update_end(&stats->sync);
 309
 310         return err;
 311 }
 312
 313 static int queue_gso_packets(struct net *net, int dp_ifindex,
 314                              struct sk_buff *skb,
 315                              const struct dp_upcall_info *upcall_info)
 316 {
 317         unsigned short gso_type = skb_shinfo(skb)->gso_type;
 318         struct dp_upcall_info later_info;
 319         struct sw_flow_key later_key;
 320         struct sk_buff *segs, *nskb;
 321         int err;
 322
 323         segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false);
 324         if (IS_ERR(segs))
 325                 return PTR_ERR(segs);
 326
 327         /* Queue all of the segments. */
 328         skb = segs;
 329         do {
 330                 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
 331                 if (err)
 332                         break;
 333
 334                 if (skb == segs && gso_type & SKB_GSO_UDP) {
 335                         /* The initial flow key extracted by ovs_flow_extract()
 336                          * in this case is for a first fragment, so we need to
 337                          * properly mark later fragments.
 338                          */
 339                         later_key = *upcall_info->key;
 340                         later_key.ip.frag = OVS_FRAG_TYPE_LATER;
 341
 342                         later_info = *upcall_info;
 343                         later_info.key = &later_key;
 344                         upcall_info = &later_info;
 345                 }
 346         } while ((skb = skb->next));
 347
 348         /* Free all of the segments. */
 349         skb = segs;
 350         do {
 351                 nskb = skb->next;
 352                 if (err)
 353                         kfree_skb(skb);
 354                 else
 355                         consume_skb(skb);
 356         } while ((skb = nskb));
 357         return err;
 358 }
 359
 360 static size_t key_attr_size(void)
 361 {
 362         return    nla_total_size(4)   /* OVS_KEY_ATTR_PRIORITY */
 363                 + nla_total_size(0)   /* OVS_KEY_ATTR_TUNNEL */
 364                   + nla_total_size(8)   /* OVS_TUNNEL_KEY_ATTR_ID */
 365                   + nla_total_size(4)   /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
 366                   + nla_total_size(4)   /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
 367                   + nla_total_size(1)   /* OVS_TUNNEL_KEY_ATTR_TOS */
 368                   + nla_total_size(1)   /* OVS_TUNNEL_KEY_ATTR_TTL */
 369                   + nla_total_size(0)   /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
 370                   + nla_total_size(0)   /* OVS_TUNNEL_KEY_ATTR_CSUM */
 371                 + nla_total_size(4)   /* OVS_KEY_ATTR_IN_PORT */
 372                 + nla_total_size(4)   /* OVS_KEY_ATTR_SKB_MARK */
 373                 + nla_total_size(12)  /* OVS_KEY_ATTR_ETHERNET */
 374                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 375                 + nla_total_size(4)   /* OVS_KEY_ATTR_8021Q */
 376                 + nla_total_size(0)   /* OVS_KEY_ATTR_ENCAP */
 377                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 378                 + nla_total_size(40)  /* OVS_KEY_ATTR_IPV6 */
 379                 + nla_total_size(2)   /* OVS_KEY_ATTR_ICMPV6 */
 380                 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
 381 }
 382
 383 static size_t upcall_msg_size(const struct sk_buff *skb,
 384                               const struct nlattr *userdata)
 385 {
 386         size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
 387                 + nla_total_size(skb->len) /* OVS_PACKET_ATTR_PACKET */
 388                 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
 389
 390         /* OVS_PACKET_ATTR_USERDATA */
 391         if (userdata)
 392                 size += NLA_ALIGN(userdata->nla_len);
 393
 394         return size;
 395 }
 396
 397 static int queue_userspace_packet(struct net *net, int dp_ifindex,
 398                                   struct sk_buff *skb,
 399                                   const struct dp_upcall_info *upcall_info)
 400 {
 401         struct ovs_header *upcall;
 402         struct sk_buff *nskb = NULL;
 403         struct sk_buff *user_skb; /* to be queued to userspace */
 404         struct nlattr *nla;
 405         int err;
 406
 407         if (vlan_tx_tag_present(skb)) {
 408                 nskb = skb_clone(skb, GFP_ATOMIC);
 409                 if (!nskb)
 410                         return -ENOMEM;
 411
 412                 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb));
 413                 if (!nskb)
 414                         return -ENOMEM;
 415
 416                 vlan_set_tci(nskb, 0);
 417
 418                 skb = nskb;
 419         }
 420
 421         if (nla_attr_size(skb->len) > USHRT_MAX) {
 422                 err = -EFBIG;
 423                 goto out;
 424         }
 425
 426         user_skb = genlmsg_new(upcall_msg_size(skb, upcall_info->userdata), GFP_ATOMIC);
 427         if (!user_skb) {
 428                 err = -ENOMEM;
 429                 goto out;
 430         }
 431
 432         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
 433                              0, upcall_info->cmd);
 434         upcall->dp_ifindex = dp_ifindex;
 435
 436         nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
 437         ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb);
 438         nla_nest_end(user_skb, nla);
 439
 440         if (upcall_info->userdata)
 441                 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
 442                           nla_len(upcall_info->userdata),
 443                           nla_data(upcall_info->userdata));
 444
 445         nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
 446
 447         skb_copy_and_csum_dev(skb, nla_data(nla));
 448
 449         genlmsg_end(user_skb, upcall);
 450         err = genlmsg_unicast(net, user_skb, upcall_info->portid);
 451
 452 out:
 453         kfree_skb(nskb);
 454         return err;
 455 }
 456
 457 static void clear_stats(struct sw_flow *flow)
 458 {
 459         flow->used = 0;
 460         flow->tcp_flags = 0;
 461         flow->packet_count = 0;
 462         flow->byte_count = 0;
 463 }
 464
 465 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 466 {
 467         struct ovs_header *ovs_header = info->userhdr;
 468         struct nlattr **a = info->attrs;
 469         struct sw_flow_actions *acts;
 470         struct sk_buff *packet;
 471         struct sw_flow *flow;
 472         struct datapath *dp;
 473         struct ethhdr *eth;
 474         int len;
 475         int err;
 476
 477         err = -EINVAL;
 478         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 479             !a[OVS_PACKET_ATTR_ACTIONS])
 480                 goto err;
 481
 482         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 483         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 484         err = -ENOMEM;
 485         if (!packet)
 486                 goto err;
 487         skb_reserve(packet, NET_IP_ALIGN);
 488
 489         nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
 490
 491         skb_reset_mac_header(packet);
 492         eth = eth_hdr(packet);
 493
 494         /* Normally, setting the skb 'protocol' field would be handled by a
 495          * call to eth_type_trans(), but it assumes there's a sending
 496          * device, which we may not have. */
 497         if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
 498                 packet->protocol = eth->h_proto;
 499         else
 500                 packet->protocol = htons(ETH_P_802_2);
 501
 502         /* Build an sw_flow for sending this packet. */
 503         flow = ovs_flow_alloc();
 504         err = PTR_ERR(flow);
 505         if (IS_ERR(flow))
 506                 goto err_kfree_skb;
 507
 508         err = ovs_flow_extract(packet, -1, &flow->key);
 509         if (err)
 510                 goto err_flow_free;
 511
 512         err = ovs_nla_get_flow_metadata(flow, a[OVS_PACKET_ATTR_KEY]);
 513         if (err)
 514                 goto err_flow_free;
 515         acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
 516         err = PTR_ERR(acts);
 517         if (IS_ERR(acts))
 518                 goto err_flow_free;
 519
 520         err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
 521                                    &flow->key, 0, &acts);
 522         rcu_assign_pointer(flow->sf_acts, acts);
 523         if (err)
 524                 goto err_flow_free;
 525
 526         OVS_CB(packet)->flow = flow;
 527         OVS_CB(packet)->pkt_key = &flow->key;
 528         packet->priority = flow->key.phy.priority;
 529         packet->mark = flow->key.phy.skb_mark;
 530
 531         rcu_read_lock();
 532         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 533         err = -ENODEV;
 534         if (!dp)
 535                 goto err_unlock;
 536
 537         local_bh_disable();
 538         err = ovs_execute_actions(dp, packet);
 539         local_bh_enable();
 540         rcu_read_unlock();
 541
 542         ovs_flow_free(flow, false);
 543         return err;
 544
 545 err_unlock:
 546         rcu_read_unlock();
 547 err_flow_free:
 548         ovs_flow_free(flow, false);
 549 err_kfree_skb:
 550         kfree_skb(packet);
 551 err:
 552         return err;
 553 }
 554
 555 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 556         [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
 557         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 558         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 559 };
 560
 561 static struct genl_ops dp_packet_genl_ops[] = {
 562         { .cmd = OVS_PACKET_CMD_EXECUTE,
 563           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 564           .policy = packet_policy,
 565           .doit = ovs_packet_cmd_execute
 566         }
 567 };
 568
 569 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
 570 {
 571         int i;
 572
 573         stats->n_flows = ovs_flow_tbl_count(&dp->table);
 574
 575         stats->n_hit = stats->n_missed = stats->n_lost = 0;
 576         for_each_possible_cpu(i) {
 577                 const struct dp_stats_percpu *percpu_stats;
 578                 struct dp_stats_percpu local_stats;
 579                 unsigned int start;
 580
 581                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 582
 583                 do {
 584                         start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
 585                         local_stats = *percpu_stats;
 586                 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
 587
 588                 stats->n_hit += local_stats.n_hit;
 589                 stats->n_missed += local_stats.n_missed;
 590                 stats->n_lost += local_stats.n_lost;
 591         }
 592 }
 593
 594 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
 595         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
 596         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
 597         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
 598 };
 599
 600 static struct genl_family dp_flow_genl_family = {
 601         .id = GENL_ID_GENERATE,
 602         .hdrsize = sizeof(struct ovs_header),
 603         .name = OVS_FLOW_FAMILY,
 604         .version = OVS_FLOW_VERSION,
 605         .maxattr = OVS_FLOW_ATTR_MAX,
 606         .netnsok = true,
 607          SET_PARALLEL_OPS
 608 };
 609
 610 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
 611         .name = OVS_FLOW_MCGROUP
 612 };
 613
 614 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
 615 {
 616         return NLMSG_ALIGN(sizeof(struct ovs_header))
 617                 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
 618                 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
 619                 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
 620                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
 621                 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
 622                 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
 623 }
 624
 625 /* Called with ovs_mutex. */
 626 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
 627                                   struct sk_buff *skb, u32 portid,
 628                                   u32 seq, u32 flags, u8 cmd)
 629 {
 630         const int skb_orig_len = skb->len;
 631         struct nlattr *start;
 632         struct ovs_flow_stats stats;
 633         struct ovs_header *ovs_header;
 634         struct nlattr *nla;
 635         unsigned long used;
 636         u8 tcp_flags;
 637         int err;
 638
 639         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
 640         if (!ovs_header)
 641                 return -EMSGSIZE;
 642
 643         ovs_header->dp_ifindex = get_dpifindex(dp);
 644
 645         /* Fill flow key. */
 646         nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
 647         if (!nla)
 648                 goto nla_put_failure;
 649
 650         err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb);
 651         if (err)
 652                 goto error;
 653         nla_nest_end(skb, nla);
 654
 655         nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
 656         if (!nla)
 657                 goto nla_put_failure;
 658
 659         err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb);
 660         if (err)
 661                 goto error;
 662
 663         nla_nest_end(skb, nla);
 664
 665         spin_lock_bh(&flow->lock);
 666         used = flow->used;
 667         stats.n_packets = flow->packet_count;
 668         stats.n_bytes = flow->byte_count;
 669         tcp_flags = flow->tcp_flags;
 670         spin_unlock_bh(&flow->lock);
 671
 672         if (used &&
 673             nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
 674                 goto nla_put_failure;
 675
 676         if (stats.n_packets &&
 677             nla_put(skb, OVS_FLOW_ATTR_STATS,
 678                     sizeof(struct ovs_flow_stats), &stats))
 679                 goto nla_put_failure;
 680
 681         if (tcp_flags &&
 682             nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
 683                 goto nla_put_failure;
 684
 685         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 686          * this is the first flow to be dumped into 'skb'.  This is unusual for
 687          * Netlink but individual action lists can be longer than
 688          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 689          * The userspace caller can always fetch the actions separately if it
 690          * really wants them.  (Most userspace callers in fact don't care.)
 691          *
 692          * This can only fail for dump operations because the skb is always
 693          * properly sized for single flows.
 694          */
 695         start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
 696         if (start) {
 697                 const struct sw_flow_actions *sf_acts;
 698
 699                 sf_acts = rcu_dereference_check(flow->sf_acts,
 700                                                 lockdep_ovsl_is_held());
 701
 702                 err = ovs_nla_put_actions(sf_acts->actions,
 703                                           sf_acts->actions_len, skb);
 704                 if (!err)
 705                         nla_nest_end(skb, start);
 706                 else {
 707                         if (skb_orig_len)
 708                                 goto error;
 709
 710                         nla_nest_cancel(skb, start);
 711                 }
 712         } else if (skb_orig_len)
 713                 goto nla_put_failure;
 714
 715         return genlmsg_end(skb, ovs_header);
 716
 717 nla_put_failure:
 718         err = -EMSGSIZE;
 719 error:
 720         genlmsg_cancel(skb, ovs_header);
 721         return err;
 722 }
 723
 724 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
 725 {
 726         const struct sw_flow_actions *sf_acts;
 727
 728         sf_acts = ovsl_dereference(flow->sf_acts);
 729
 730         return genlmsg_new(ovs_flow_cmd_msg_size(sf_acts), GFP_KERNEL);
 731 }
 732
 733 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
 734                                                struct datapath *dp,
 735                                                u32 portid, u32 seq, u8 cmd)
 736 {
 737         struct sk_buff *skb;
 738         int retval;
 739
 740         skb = ovs_flow_cmd_alloc_info(flow);
 741         if (!skb)
 742                 return ERR_PTR(-ENOMEM);
 743
 744         retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
 745         BUG_ON(retval < 0);
 746         return skb;
 747 }
 748
 749 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
 750 {
 751         struct nlattr **a = info->attrs;
 752         struct ovs_header *ovs_header = info->userhdr;
 753         struct sw_flow_key key, masked_key;
 754         struct sw_flow *flow = NULL;
 755         struct sw_flow_mask mask;
 756         struct sk_buff *reply;
 757         struct datapath *dp;
 758         struct sw_flow_actions *acts = NULL;
 759         struct sw_flow_match match;
 760         int error;
 761
 762         /* Extract key. */
 763         error = -EINVAL;
 764         if (!a[OVS_FLOW_ATTR_KEY])
 765                 goto error;
 766
 767         ovs_match_init(&match, &key, &mask);
 768         error = ovs_nla_get_match(&match,
 769                                   a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
 770         if (error)
 771                 goto error;
 772
 773         /* Validate actions. */
 774         if (a[OVS_FLOW_ATTR_ACTIONS]) {
 775                 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
 776                 error = PTR_ERR(acts);
 777                 if (IS_ERR(acts))
 778                         goto error;
 779
 780                 ovs_flow_mask_key(&masked_key, &key, &mask);
 781                 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS],
 782                                              &masked_key, 0, &acts);
 783                 if (error) {
 784                         OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
 785                         goto err_kfree;
 786                 }
 787         } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
 788                 error = -EINVAL;
 789                 goto error;
 790         }
 791
 792         ovs_lock();
 793         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 794         error = -ENODEV;
 795         if (!dp)
 796                 goto err_unlock_ovs;
 797
 798         /* Check if this is a duplicate flow */
 799         flow = ovs_flow_tbl_lookup(&dp->table, &key);
 800         if (!flow) {
 801                 /* Bail out if we're not allowed to create a new flow. */
 802                 error = -ENOENT;
 803                 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
 804                         goto err_unlock_ovs;
 805
 806                 /* Allocate flow. */
 807                 flow = ovs_flow_alloc();
 808                 if (IS_ERR(flow)) {
 809                         error = PTR_ERR(flow);
 810                         goto err_unlock_ovs;
 811                 }
 812                 clear_stats(flow);
 813
 814                 flow->key = masked_key;
 815                 flow->unmasked_key = key;
 816                 rcu_assign_pointer(flow->sf_acts, acts);
 817
 818                 /* Put flow in bucket. */
 819                 error = ovs_flow_tbl_insert(&dp->table, flow, &mask);
 820                 if (error) {
 821                         acts = NULL;
 822                         goto err_flow_free;
 823                 }
 824
 825                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
 826                                                 info->snd_seq, OVS_FLOW_CMD_NEW);
 827         } else {
 828                 /* We found a matching flow. */
 829                 struct sw_flow_actions *old_acts;
 830
 831                 /* Bail out if we're not allowed to modify an existing flow.
 832                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
 833                  * because Generic Netlink treats the latter as a dump
 834                  * request.  We also accept NLM_F_EXCL in case that bug ever
 835                  * gets fixed.
 836                  */
 837                 error = -EEXIST;
 838                 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
 839                     info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
 840                         goto err_unlock_ovs;
 841
 842                 /* The unmasked key has to be the same for flow updates. */
 843                 error = -EINVAL;
 844                 if (!ovs_flow_cmp_unmasked_key(flow, &match)) {
 845                         OVS_NLERR("Flow modification message rejected, unmasked key does not match.\n");
 846                         goto err_unlock_ovs;
 847                 }
 848
 849                 /* Update actions. */
 850                 old_acts = ovsl_dereference(flow->sf_acts);
 851                 rcu_assign_pointer(flow->sf_acts, acts);
 852                 ovs_nla_free_flow_actions(old_acts);
 853
 854                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
 855                                                info->snd_seq, OVS_FLOW_CMD_NEW);
 856
 857                 /* Clear stats. */
 858                 if (a[OVS_FLOW_ATTR_CLEAR]) {
 859                         spin_lock_bh(&flow->lock);
 860                         clear_stats(flow);
 861                         spin_unlock_bh(&flow->lock);
 862                 }
 863         }
 864         ovs_unlock();
 865
 866         if (!IS_ERR(reply))
 867                 ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
 868         else
 869                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
 870                                 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
 871         return 0;
 872
 873 err_flow_free:
 874         ovs_flow_free(flow, false);
 875 err_unlock_ovs:
 876         ovs_unlock();
 877 err_kfree:
 878         kfree(acts);
 879 error:
 880         return error;
 881 }
 882
 883 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
 884 {
 885         struct nlattr **a = info->attrs;
 886         struct ovs_header *ovs_header = info->userhdr;
 887         struct sw_flow_key key;
 888         struct sk_buff *reply;
 889         struct sw_flow *flow;
 890         struct datapath *dp;
 891         struct sw_flow_match match;
 892         int err;
 893
 894         if (!a[OVS_FLOW_ATTR_KEY]) {
 895                 OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
 896                 return -EINVAL;
 897         }
 898
 899         ovs_match_init(&match, &key, NULL);
 900         err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
 901         if (err)
 902                 return err;
 903
 904         ovs_lock();
 905         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 906         if (!dp) {
 907                 err = -ENODEV;
 908                 goto unlock;
 909         }
 910
 911         flow = ovs_flow_tbl_lookup(&dp->table, &key);
 912         if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) {
 913                 err = -ENOENT;
 914                 goto unlock;
 915         }
 916
 917         reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
 918                                         info->snd_seq, OVS_FLOW_CMD_NEW);
 919         if (IS_ERR(reply)) {
 920                 err = PTR_ERR(reply);
 921                 goto unlock;
 922         }
 923
 924         ovs_unlock();
 925         return genlmsg_reply(reply, info);
 926 unlock:
 927         ovs_unlock();
 928         return err;
 929 }
 930
 931 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
 932 {
 933         struct nlattr **a = info->attrs;
 934         struct ovs_header *ovs_header = info->userhdr;
 935         struct sw_flow_key key;
 936         struct sk_buff *reply;
 937         struct sw_flow *flow;
 938         struct datapath *dp;
 939         struct sw_flow_match match;
 940         int err;
 941
 942         ovs_lock();
 943         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 944         if (!dp) {
 945                 err = -ENODEV;
 946                 goto unlock;
 947         }
 948
 949         if (!a[OVS_FLOW_ATTR_KEY]) {
 950                 err = ovs_flow_tbl_flush(&dp->table);
 951                 goto unlock;
 952         }
 953
 954         ovs_match_init(&match, &key, NULL);
 955         err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
 956         if (err)
 957                 goto unlock;
 958
 959         flow = ovs_flow_tbl_lookup(&dp->table, &key);
 960         if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) {
 961                 err = -ENOENT;
 962                 goto unlock;
 963         }
 964
 965         reply = ovs_flow_cmd_alloc_info(flow);
 966         if (!reply) {
 967                 err = -ENOMEM;
 968                 goto unlock;
 969         }
 970
 971         ovs_flow_tbl_remove(&dp->table, flow);
 972
 973         err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
 974                                      info->snd_seq, 0, OVS_FLOW_CMD_DEL);
 975         BUG_ON(err < 0);
 976
 977         ovs_flow_free(flow, true);
 978         ovs_unlock();
 979
 980         ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
 981         return 0;
 982 unlock:
 983         ovs_unlock();
 984         return err;
 985 }
 986
 987 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
 988 {
 989         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
 990         struct table_instance *ti;
 991         struct datapath *dp;
 992
 993         rcu_read_lock();
 994         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 995         if (!dp) {
 996                 rcu_read_unlock();
 997                 return -ENODEV;
 998         }
 999
1000         ti = rcu_dereference(dp->table.ti);
1001         for (;;) {
1002                 struct sw_flow *flow;
1003                 u32 bucket, obj;
1004
1005                 bucket = cb->args[0];
1006                 obj = cb->args[1];
1007                 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1008                 if (!flow)
1009                         break;
1010
1011                 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1012                                            NETLINK_CB(cb->skb).portid,
1013                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1014                                            OVS_FLOW_CMD_NEW) < 0)
1015                         break;
1016
1017                 cb->args[0] = bucket;
1018                 cb->args[1] = obj;
1019         }
1020         rcu_read_unlock();
1021         return skb->len;
1022 }
1023
1024 static struct genl_ops dp_flow_genl_ops[] = {
1025         { .cmd = OVS_FLOW_CMD_NEW,
1026           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1027           .policy = flow_policy,
1028           .doit = ovs_flow_cmd_new_or_set
1029         },
1030         { .cmd = OVS_FLOW_CMD_DEL,
1031           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1032           .policy = flow_policy,
1033           .doit = ovs_flow_cmd_del
1034         },
1035         { .cmd = OVS_FLOW_CMD_GET,
1036           .flags = 0,               /* OK for unprivileged users. */
1037           .policy = flow_policy,
1038           .doit = ovs_flow_cmd_get,
1039           .dumpit = ovs_flow_cmd_dump
1040         },
1041         { .cmd = OVS_FLOW_CMD_SET,
1042           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1043           .policy = flow_policy,
1044           .doit = ovs_flow_cmd_new_or_set,
1045         },
1046 };
1047
1048 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1049         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1050         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1051 };
1052
1053 static struct genl_family dp_datapath_genl_family = {
1054         .id = GENL_ID_GENERATE,
1055         .hdrsize = sizeof(struct ovs_header),
1056         .name = OVS_DATAPATH_FAMILY,
1057         .version = OVS_DATAPATH_VERSION,
1058         .maxattr = OVS_DP_ATTR_MAX,
1059         .netnsok = true,
1060          SET_PARALLEL_OPS
1061 };
1062
1063 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1064         .name = OVS_DATAPATH_MCGROUP
1065 };
1066
1067 static size_t ovs_dp_cmd_msg_size(void)
1068 {
1069         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1070
1071         msgsize += nla_total_size(IFNAMSIZ);
1072         msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1073
1074         return msgsize;
1075 }
1076
1077 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1078                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1079 {
1080         struct ovs_header *ovs_header;
1081         struct ovs_dp_stats dp_stats;
1082         int err;
1083
1084         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1085                                    flags, cmd);
1086         if (!ovs_header)
1087                 goto error;
1088
1089         ovs_header->dp_ifindex = get_dpifindex(dp);
1090
1091         rcu_read_lock();
1092         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1093         rcu_read_unlock();
1094         if (err)
1095                 goto nla_put_failure;
1096
1097         get_dp_stats(dp, &dp_stats);
1098         if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
1099                 goto nla_put_failure;
1100
1101         return genlmsg_end(skb, ovs_header);
1102
1103 nla_put_failure:
1104         genlmsg_cancel(skb, ovs_header);
1105 error:
1106         return -EMSGSIZE;
1107 }
1108
1109 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
1110                                              u32 seq, u8 cmd)
1111 {
1112         struct sk_buff *skb;
1113         int retval;
1114
1115         skb = genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1116         if (!skb)
1117                 return ERR_PTR(-ENOMEM);
1118
1119         retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
1120         if (retval < 0) {
1121                 kfree_skb(skb);
1122                 return ERR_PTR(retval);
1123         }
1124         return skb;
1125 }
1126
1127 /* Called with ovs_mutex. */
1128 static struct datapath *lookup_datapath(struct net *net,
1129                                         struct ovs_header *ovs_header,
1130                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1131 {
1132         struct datapath *dp;
1133
1134         if (!a[OVS_DP_ATTR_NAME])
1135                 dp = get_dp(net, ovs_header->dp_ifindex);
1136         else {
1137                 struct vport *vport;
1138
1139                 rcu_read_lock();
1140                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1141                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1142                 rcu_read_unlock();
1143         }
1144         return dp ? dp : ERR_PTR(-ENODEV);
1145 }
1146
1147 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1148 {
1149         struct nlattr **a = info->attrs;
1150         struct vport_parms parms;
1151         struct sk_buff *reply;
1152         struct datapath *dp;
1153         struct vport *vport;
1154         struct ovs_net *ovs_net;
1155         int err, i;
1156
1157         err = -EINVAL;
1158         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1159                 goto err;
1160
1161         ovs_lock();
1162
1163         err = -ENOMEM;
1164         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1165         if (dp == NULL)
1166                 goto err_unlock_ovs;
1167
1168         ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1169
1170         /* Allocate table. */
1171         err = ovs_flow_tbl_init(&dp->table);
1172         if (err)
1173                 goto err_free_dp;
1174
1175         dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1176         if (!dp->stats_percpu) {
1177                 err = -ENOMEM;
1178                 goto err_destroy_table;
1179         }
1180
1181         dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1182                             GFP_KERNEL);
1183         if (!dp->ports) {
1184                 err = -ENOMEM;
1185                 goto err_destroy_percpu;
1186         }
1187
1188         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1189                 INIT_HLIST_HEAD(&dp->ports[i]);
1190
1191         /* Set up our datapath device. */
1192         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1193         parms.type = OVS_VPORT_TYPE_INTERNAL;
1194         parms.options = NULL;
1195         parms.dp = dp;
1196         parms.port_no = OVSP_LOCAL;
1197         parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1198
1199         vport = new_vport(&parms);
1200         if (IS_ERR(vport)) {
1201                 err = PTR_ERR(vport);
1202                 if (err == -EBUSY)
1203                         err = -EEXIST;
1204
1205                 goto err_destroy_ports_array;
1206         }
1207
1208         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1209                                       info->snd_seq, OVS_DP_CMD_NEW);
1210         err = PTR_ERR(reply);
1211         if (IS_ERR(reply))
1212                 goto err_destroy_local_port;
1213
1214         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1215         list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1216
1217         ovs_unlock();
1218
1219         ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1220         return 0;
1221
1222 err_destroy_local_port:
1223         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1224 err_destroy_ports_array:
1225         kfree(dp->ports);
1226 err_destroy_percpu:
1227         free_percpu(dp->stats_percpu);
1228 err_destroy_table:
1229         ovs_flow_tbl_destroy(&dp->table);
1230 err_free_dp:
1231         release_net(ovs_dp_get_net(dp));
1232         kfree(dp);
1233 err_unlock_ovs:
1234         ovs_unlock();
1235 err:
1236         return err;
1237 }
1238
1239 /* Called with ovs_mutex. */
1240 static void __dp_destroy(struct datapath *dp)
1241 {
1242         int i;
1243
1244         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1245                 struct vport *vport;
1246                 struct hlist_node *n;
1247
1248                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1249                         if (vport->port_no != OVSP_LOCAL)
1250                                 ovs_dp_detach_port(vport);
1251         }
1252
1253         list_del_rcu(&dp->list_node);
1254
1255         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1256          * all port in datapath are destroyed first before freeing datapath.
1257          */
1258         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1259
1260         call_rcu(&dp->rcu, destroy_dp_rcu);
1261 }
1262
1263 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1264 {
1265         struct sk_buff *reply;
1266         struct datapath *dp;
1267         int err;
1268
1269         ovs_lock();
1270         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1271         err = PTR_ERR(dp);
1272         if (IS_ERR(dp))
1273                 goto unlock;
1274
1275         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1276                                       info->snd_seq, OVS_DP_CMD_DEL);
1277         err = PTR_ERR(reply);
1278         if (IS_ERR(reply))
1279                 goto unlock;
1280
1281         __dp_destroy(dp);
1282         ovs_unlock();
1283
1284         ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1285
1286         return 0;
1287 unlock:
1288         ovs_unlock();
1289         return err;
1290 }
1291
1292 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1293 {
1294         struct sk_buff *reply;
1295         struct datapath *dp;
1296         int err;
1297
1298         ovs_lock();
1299         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1300         err = PTR_ERR(dp);
1301         if (IS_ERR(dp))
1302                 goto unlock;
1303
1304         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1305                                       info->snd_seq, OVS_DP_CMD_NEW);
1306         if (IS_ERR(reply)) {
1307                 err = PTR_ERR(reply);
1308                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1309                                 ovs_dp_datapath_multicast_group.id, err);
1310                 err = 0;
1311                 goto unlock;
1312         }
1313
1314         ovs_unlock();
1315         ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1316
1317         return 0;
1318 unlock:
1319         ovs_unlock();
1320         return err;
1321 }
1322
1323 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1324 {
1325         struct sk_buff *reply;
1326         struct datapath *dp;
1327         int err;
1328
1329         ovs_lock();
1330         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1331         if (IS_ERR(dp)) {
1332                 err = PTR_ERR(dp);
1333                 goto unlock;
1334         }
1335
1336         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1337                                       info->snd_seq, OVS_DP_CMD_NEW);
1338         if (IS_ERR(reply)) {
1339                 err = PTR_ERR(reply);
1340                 goto unlock;
1341         }
1342
1343         ovs_unlock();
1344         return genlmsg_reply(reply, info);
1345
1346 unlock:
1347         ovs_unlock();
1348         return err;
1349 }
1350
1351 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1352 {
1353         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1354         struct datapath *dp;
1355         int skip = cb->args[0];
1356         int i = 0;
1357
1358         rcu_read_lock();
1359         list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1360                 if (i >= skip &&
1361                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1362                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1363                                          OVS_DP_CMD_NEW) < 0)
1364                         break;
1365                 i++;
1366         }
1367         rcu_read_unlock();
1368
1369         cb->args[0] = i;
1370
1371         return skb->len;
1372 }
1373
1374 static struct genl_ops dp_datapath_genl_ops[] = {
1375         { .cmd = OVS_DP_CMD_NEW,
1376           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1377           .policy = datapath_policy,
1378           .doit = ovs_dp_cmd_new
1379         },
1380         { .cmd = OVS_DP_CMD_DEL,
1381           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1382           .policy = datapath_policy,
1383           .doit = ovs_dp_cmd_del
1384         },
1385         { .cmd = OVS_DP_CMD_GET,
1386           .flags = 0,               /* OK for unprivileged users. */
1387           .policy = datapath_policy,
1388           .doit = ovs_dp_cmd_get,
1389           .dumpit = ovs_dp_cmd_dump
1390         },
1391         { .cmd = OVS_DP_CMD_SET,
1392           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1393           .policy = datapath_policy,
1394           .doit = ovs_dp_cmd_set,
1395         },
1396 };
1397
1398 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1399         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1400         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1401         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1402         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1403         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1404         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1405 };
1406
1407 static struct genl_family dp_vport_genl_family = {
1408         .id = GENL_ID_GENERATE,
1409         .hdrsize = sizeof(struct ovs_header),
1410         .name = OVS_VPORT_FAMILY,
1411         .version = OVS_VPORT_VERSION,
1412         .maxattr = OVS_VPORT_ATTR_MAX,
1413         .netnsok = true,
1414          SET_PARALLEL_OPS
1415 };
1416
1417 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1418         .name = OVS_VPORT_MCGROUP
1419 };
1420
1421 /* Called with ovs_mutex or RCU read lock. */
1422 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1423                                    u32 portid, u32 seq, u32 flags, u8 cmd)
1424 {
1425         struct ovs_header *ovs_header;
1426         struct ovs_vport_stats vport_stats;
1427         int err;
1428
1429         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1430                                  flags, cmd);
1431         if (!ovs_header)
1432                 return -EMSGSIZE;
1433
1434         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1435
1436         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1437             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1438             nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1439             nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
1440                 goto nla_put_failure;
1441
1442         ovs_vport_get_stats(vport, &vport_stats);
1443         if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1444                     &vport_stats))
1445                 goto nla_put_failure;
1446
1447         err = ovs_vport_get_options(vport, skb);
1448         if (err == -EMSGSIZE)
1449                 goto error;
1450
1451         return genlmsg_end(skb, ovs_header);
1452
1453 nla_put_failure:
1454         err = -EMSGSIZE;
1455 error:
1456         genlmsg_cancel(skb, ovs_header);
1457         return err;
1458 }
1459
1460 /* Called with ovs_mutex or RCU read lock. */
1461 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1462                                          u32 seq, u8 cmd)
1463 {
1464         struct sk_buff *skb;
1465         int retval;
1466
1467         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1468         if (!skb)
1469                 return ERR_PTR(-ENOMEM);
1470
1471         retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1472         BUG_ON(retval < 0);
1473
1474         return skb;
1475 }
1476
1477 /* Called with ovs_mutex or RCU read lock. */
1478 static struct vport *lookup_vport(struct net *net,
1479                                   struct ovs_header *ovs_header,
1480                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1481 {
1482         struct datapath *dp;
1483         struct vport *vport;
1484
1485         if (a[OVS_VPORT_ATTR_NAME]) {
1486                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1487                 if (!vport)
1488                         return ERR_PTR(-ENODEV);
1489                 if (ovs_header->dp_ifindex &&
1490                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1491                         return ERR_PTR(-ENODEV);
1492                 return vport;
1493         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1494                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1495
1496                 if (port_no >= DP_MAX_PORTS)
1497                         return ERR_PTR(-EFBIG);
1498
1499                 dp = get_dp(net, ovs_header->dp_ifindex);
1500                 if (!dp)
1501                         return ERR_PTR(-ENODEV);
1502
1503                 vport = ovs_vport_ovsl_rcu(dp, port_no);
1504                 if (!vport)
1505                         return ERR_PTR(-ENODEV);
1506                 return vport;
1507         } else
1508                 return ERR_PTR(-EINVAL);
1509 }
1510
1511 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1512 {
1513         struct nlattr **a = info->attrs;
1514         struct ovs_header *ovs_header = info->userhdr;
1515         struct vport_parms parms;
1516         struct sk_buff *reply;
1517         struct vport *vport;
1518         struct datapath *dp;
1519         u32 port_no;
1520         int err;
1521
1522         err = -EINVAL;
1523         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1524             !a[OVS_VPORT_ATTR_UPCALL_PID])
1525                 goto exit;
1526
1527         ovs_lock();
1528         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1529         err = -ENODEV;
1530         if (!dp)
1531                 goto exit_unlock;
1532
1533         if (a[OVS_VPORT_ATTR_PORT_NO]) {
1534                 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1535
1536                 err = -EFBIG;
1537                 if (port_no >= DP_MAX_PORTS)
1538                         goto exit_unlock;
1539
1540                 vport = ovs_vport_ovsl(dp, port_no);
1541                 err = -EBUSY;
1542                 if (vport)
1543                         goto exit_unlock;
1544         } else {
1545                 for (port_no = 1; ; port_no++) {
1546                         if (port_no >= DP_MAX_PORTS) {
1547                                 err = -EFBIG;
1548                                 goto exit_unlock;
1549                         }
1550                         vport = ovs_vport_ovsl(dp, port_no);
1551                         if (!vport)
1552                                 break;
1553                 }
1554         }
1555
1556         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1557         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1558         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1559         parms.dp = dp;
1560         parms.port_no = port_no;
1561         parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1562
1563         vport = new_vport(&parms);
1564         err = PTR_ERR(vport);
1565         if (IS_ERR(vport))
1566                 goto exit_unlock;
1567
1568         err = 0;
1569         if (a[OVS_VPORT_ATTR_STATS])
1570                 ovs_vport_set_stats(vport, nla_data(a[OVS_VPORT_ATTR_STATS]));
1571
1572         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1573                                          OVS_VPORT_CMD_NEW);
1574         if (IS_ERR(reply)) {
1575                 err = PTR_ERR(reply);
1576                 ovs_dp_detach_port(vport);
1577                 goto exit_unlock;
1578         }
1579
1580         ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
1581
1582 exit_unlock:
1583         ovs_unlock();
1584 exit:
1585         return err;
1586 }
1587
1588 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1589 {
1590         struct nlattr **a = info->attrs;
1591         struct sk_buff *reply;
1592         struct vport *vport;
1593         int err;
1594
1595         ovs_lock();
1596         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1597         err = PTR_ERR(vport);
1598         if (IS_ERR(vport))
1599                 goto exit_unlock;
1600
1601         if (a[OVS_VPORT_ATTR_TYPE] &&
1602             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1603                 err = -EINVAL;
1604                 goto exit_unlock;
1605         }
1606
1607         reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1608         if (!reply) {
1609                 err = -ENOMEM;
1610                 goto exit_unlock;
1611         }
1612
1613         if (a[OVS_VPORT_ATTR_OPTIONS]) {
1614                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1615                 if (err)
1616                         goto exit_free;
1617         }
1618
1619         if (a[OVS_VPORT_ATTR_STATS])
1620                 ovs_vport_set_stats(vport, nla_data(a[OVS_VPORT_ATTR_STATS]));
1621
1622         if (a[OVS_VPORT_ATTR_UPCALL_PID])
1623                 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1624
1625         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1626                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1627         BUG_ON(err < 0);
1628
1629         ovs_unlock();
1630         ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
1631         return 0;
1632
1633 exit_free:
1634         kfree_skb(reply);
1635 exit_unlock:
1636         ovs_unlock();
1637         return err;
1638 }
1639
1640 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1641 {
1642         struct nlattr **a = info->attrs;
1643         struct sk_buff *reply;
1644         struct vport *vport;
1645         int err;
1646
1647         ovs_lock();
1648         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1649         err = PTR_ERR(vport);
1650         if (IS_ERR(vport))
1651                 goto exit_unlock;
1652
1653         if (vport->port_no == OVSP_LOCAL) {
1654                 err = -EINVAL;
1655                 goto exit_unlock;
1656         }
1657
1658         reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
1659                                          info->snd_seq, OVS_VPORT_CMD_DEL);
1660         err = PTR_ERR(reply);
1661         if (IS_ERR(reply))
1662                 goto exit_unlock;
1663
1664         err = 0;
1665         ovs_dp_detach_port(vport);
1666
1667         ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
1668
1669 exit_unlock:
1670         ovs_unlock();
1671         return err;
1672 }
1673
1674 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1675 {
1676         struct nlattr **a = info->attrs;
1677         struct ovs_header *ovs_header = info->userhdr;
1678         struct sk_buff *reply;
1679         struct vport *vport;
1680         int err;
1681
1682         rcu_read_lock();
1683         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1684         err = PTR_ERR(vport);
1685         if (IS_ERR(vport))
1686                 goto exit_unlock;
1687
1688         reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
1689                                          info->snd_seq, OVS_VPORT_CMD_NEW);
1690         err = PTR_ERR(reply);
1691         if (IS_ERR(reply))
1692                 goto exit_unlock;
1693
1694         rcu_read_unlock();
1695
1696         return genlmsg_reply(reply, info);
1697
1698 exit_unlock:
1699         rcu_read_unlock();
1700         return err;
1701 }
1702
1703 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1704 {
1705         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1706         struct datapath *dp;
1707         int bucket = cb->args[0], skip = cb->args[1];
1708         int i, j = 0;
1709
1710         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1711         if (!dp)
1712                 return -ENODEV;
1713
1714         rcu_read_lock();
1715         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1716                 struct vport *vport;
1717
1718                 j = 0;
1719                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1720                         if (j >= skip &&
1721                             ovs_vport_cmd_fill_info(vport, skb,
1722                                                     NETLINK_CB(cb->skb).portid,
1723                                                     cb->nlh->nlmsg_seq,
1724                                                     NLM_F_MULTI,
1725                                                     OVS_VPORT_CMD_NEW) < 0)
1726                                 goto out;
1727
1728                         j++;
1729                 }
1730                 skip = 0;
1731         }
1732 out:
1733         rcu_read_unlock();
1734
1735         cb->args[0] = i;
1736         cb->args[1] = j;
1737
1738         return skb->len;
1739 }
1740
1741 static struct genl_ops dp_vport_genl_ops[] = {
1742         { .cmd = OVS_VPORT_CMD_NEW,
1743           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1744           .policy = vport_policy,
1745           .doit = ovs_vport_cmd_new
1746         },
1747         { .cmd = OVS_VPORT_CMD_DEL,
1748           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1749           .policy = vport_policy,
1750           .doit = ovs_vport_cmd_del
1751         },
1752         { .cmd = OVS_VPORT_CMD_GET,
1753           .flags = 0,               /* OK for unprivileged users. */
1754           .policy = vport_policy,
1755           .doit = ovs_vport_cmd_get,
1756           .dumpit = ovs_vport_cmd_dump
1757         },
1758         { .cmd = OVS_VPORT_CMD_SET,
1759           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1760           .policy = vport_policy,
1761           .doit = ovs_vport_cmd_set,
1762         },
1763 };
1764
1765 struct genl_family_and_ops {
1766         struct genl_family *family;
1767         struct genl_ops *ops;
1768         int n_ops;
1769         struct genl_multicast_group *group;
1770 };
1771
1772 static const struct genl_family_and_ops dp_genl_families[] = {
1773         { &dp_datapath_genl_family,
1774           dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1775           &ovs_dp_datapath_multicast_group },
1776         { &dp_vport_genl_family,
1777           dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1778           &ovs_dp_vport_multicast_group },
1779         { &dp_flow_genl_family,
1780           dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1781           &ovs_dp_flow_multicast_group },
1782         { &dp_packet_genl_family,
1783           dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1784           NULL },
1785 };
1786
1787 static void dp_unregister_genl(int n_families)
1788 {
1789         int i;
1790
1791         for (i = 0; i < n_families; i++)
1792                 genl_unregister_family(dp_genl_families[i].family);
1793 }
1794
1795 static int dp_register_genl(void)
1796 {
1797         int n_registered;
1798         int err;
1799         int i;
1800
1801         n_registered = 0;
1802         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1803                 const struct genl_family_and_ops *f = &dp_genl_families[i];
1804
1805                 err = genl_register_family_with_ops(f->family, f->ops,
1806                                                     f->n_ops);
1807                 if (err)
1808                         goto error;
1809                 n_registered++;
1810
1811                 if (f->group) {
1812                         err = genl_register_mc_group(f->family, f->group);
1813                         if (err)
1814                                 goto error;
1815                 }
1816         }
1817
1818         return 0;
1819
1820 error:
1821         dp_unregister_genl(n_registered);
1822         return err;
1823 }
1824
1825 static int __net_init ovs_init_net(struct net *net)
1826 {
1827         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1828
1829         INIT_LIST_HEAD(&ovs_net->dps);
1830         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
1831         return 0;
1832 }
1833
1834 static void __net_exit ovs_exit_net(struct net *net)
1835 {
1836         struct datapath *dp, *dp_next;
1837         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1838
1839         ovs_lock();
1840         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
1841                 __dp_destroy(dp);
1842         ovs_unlock();
1843
1844         cancel_work_sync(&ovs_net->dp_notify_work);
1845 }
1846
1847 static struct pernet_operations ovs_net_ops = {
1848         .init = ovs_init_net,
1849         .exit = ovs_exit_net,
1850         .id   = &ovs_net_id,
1851         .size = sizeof(struct ovs_net),
1852 };
1853
1854 DEFINE_COMPAT_PNET_REG_FUNC(device);
1855
1856 static int __init dp_init(void)
1857 {
1858         int err;
1859
1860         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
1861
1862         pr_info("Open vSwitch switching datapath %s, built "__DATE__" "__TIME__"\n",
1863                 VERSION);
1864
1865         err = ovs_flow_init();
1866         if (err)
1867                 goto error;
1868
1869         err = ovs_vport_init();
1870         if (err)
1871                 goto error_flow_exit;
1872
1873         err = register_pernet_device(&ovs_net_ops);
1874         if (err)
1875                 goto error_vport_exit;
1876
1877         err = register_netdevice_notifier(&ovs_dp_device_notifier);
1878         if (err)
1879                 goto error_netns_exit;
1880
1881         err = dp_register_genl();
1882         if (err < 0)
1883                 goto error_unreg_notifier;
1884
1885         return 0;
1886
1887 error_unreg_notifier:
1888         unregister_netdevice_notifier(&ovs_dp_device_notifier);
1889 error_netns_exit:
1890         unregister_pernet_device(&ovs_net_ops);
1891 error_vport_exit:
1892         ovs_vport_exit();
1893 error_flow_exit:
1894         ovs_flow_exit();
1895 error:
1896         return err;
1897 }
1898
1899 static void dp_cleanup(void)
1900 {
1901         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
1902         unregister_netdevice_notifier(&ovs_dp_device_notifier);
1903         unregister_pernet_device(&ovs_net_ops);
1904         rcu_barrier();
1905         ovs_vport_exit();
1906         ovs_flow_exit();
1907 }
1908
1909 module_init(dp_init);
1910 module_exit(dp_cleanup);
1911
1912 MODULE_DESCRIPTION("Open vSwitch switching datapath");
1913 MODULE_LICENSE("GPL");
1914 MODULE_VERSION(VERSION);