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