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         u32 n_mask_hit;
 227         int error;
 228
 229         stats = this_cpu_ptr(dp->stats_percpu);
 230
 231         /* Extract flow from 'skb' into 'key'. */
 232         error = ovs_flow_extract(skb, p->port_no, &key);
 233         if (unlikely(error)) {
 234                 kfree_skb(skb);
 235                 return;
 236         }
 237
 238         /* Look up flow. */
 239         flow = ovs_flow_tbl_lookup(&dp->table, &key, &n_mask_hit);
 240         if (unlikely(!flow)) {
 241                 struct dp_upcall_info upcall;
 242
 243                 upcall.cmd = OVS_PACKET_CMD_MISS;
 244                 upcall.key = &key;
 245                 upcall.userdata = NULL;
 246                 upcall.portid = p->upcall_portid;
 247                 ovs_dp_upcall(dp, skb, &upcall);
 248                 consume_skb(skb);
 249                 stats_counter = &stats->n_missed;
 250                 goto out;
 251         }
 252
 253         OVS_CB(skb)->flow = flow;
 254         OVS_CB(skb)->pkt_key = &key;
 255
 256         stats_counter = &stats->n_hit;
 257         ovs_flow_used(OVS_CB(skb)->flow, skb);
 258         ovs_execute_actions(dp, skb);
 259
 260 out:
 261         /* Update datapath statistics. */
 262         u64_stats_update_begin(&stats->sync);
 263         (*stats_counter)++;
 264         stats->n_mask_hit += n_mask_hit;
 265         u64_stats_update_end(&stats->sync);
 266 }
 267
 268 static struct genl_family dp_packet_genl_family = {
 269         .id = GENL_ID_GENERATE,
 270         .hdrsize = sizeof(struct ovs_header),
 271         .name = OVS_PACKET_FAMILY,
 272         .version = OVS_PACKET_VERSION,
 273         .maxattr = OVS_PACKET_ATTR_MAX,
 274         .netnsok = true,
 275          SET_PARALLEL_OPS
 276 };
 277
 278 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
 279                   const struct dp_upcall_info *upcall_info)
 280 {
 281         struct dp_stats_percpu *stats;
 282         int dp_ifindex;
 283         int err;
 284
 285         if (upcall_info->portid == 0) {
 286                 err = -ENOTCONN;
 287                 goto err;
 288         }
 289
 290         dp_ifindex = get_dpifindex(dp);
 291         if (!dp_ifindex) {
 292                 err = -ENODEV;
 293                 goto err;
 294         }
 295
 296         if (!skb_is_gso(skb))
 297                 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
 298         else
 299                 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
 300         if (err)
 301                 goto err;
 302
 303         return 0;
 304
 305 err:
 306         stats = this_cpu_ptr(dp->stats_percpu);
 307
 308         u64_stats_update_begin(&stats->sync);
 309         stats->n_lost++;
 310         u64_stats_update_end(&stats->sync);
 311
 312         return err;
 313 }
 314
 315 static int queue_gso_packets(struct net *net, int dp_ifindex,
 316                              struct sk_buff *skb,
 317                              const struct dp_upcall_info *upcall_info)
 318 {
 319         unsigned short gso_type = skb_shinfo(skb)->gso_type;
 320         struct dp_upcall_info later_info;
 321         struct sw_flow_key later_key;
 322         struct sk_buff *segs, *nskb;
 323         int err;
 324
 325         segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false);
 326         if (IS_ERR(segs))
 327                 return PTR_ERR(segs);
 328
 329         /* Queue all of the segments. */
 330         skb = segs;
 331         do {
 332                 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
 333                 if (err)
 334                         break;
 335
 336                 if (skb == segs && gso_type & SKB_GSO_UDP) {
 337                         /* The initial flow key extracted by ovs_flow_extract()
 338                          * in this case is for a first fragment, so we need to
 339                          * properly mark later fragments.
 340                          */
 341                         later_key = *upcall_info->key;
 342                         later_key.ip.frag = OVS_FRAG_TYPE_LATER;
 343
 344                         later_info = *upcall_info;
 345                         later_info.key = &later_key;
 346                         upcall_info = &later_info;
 347                 }
 348         } while ((skb = skb->next));
 349
 350         /* Free all of the segments. */
 351         skb = segs;
 352         do {
 353                 nskb = skb->next;
 354                 if (err)
 355                         kfree_skb(skb);
 356                 else
 357                         consume_skb(skb);
 358         } while ((skb = nskb));
 359         return err;
 360 }
 361
 362 static size_t key_attr_size(void)
 363 {
 364         return    nla_total_size(4)   /* OVS_KEY_ATTR_PRIORITY */
 365                 + nla_total_size(0)   /* OVS_KEY_ATTR_TUNNEL */
 366                   + nla_total_size(8)   /* OVS_TUNNEL_KEY_ATTR_ID */
 367                   + nla_total_size(4)   /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
 368                   + nla_total_size(4)   /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
 369                   + nla_total_size(1)   /* OVS_TUNNEL_KEY_ATTR_TOS */
 370                   + nla_total_size(1)   /* OVS_TUNNEL_KEY_ATTR_TTL */
 371                   + nla_total_size(0)   /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
 372                   + nla_total_size(0)   /* OVS_TUNNEL_KEY_ATTR_CSUM */
 373                 + nla_total_size(4)   /* OVS_KEY_ATTR_IN_PORT */
 374                 + nla_total_size(4)   /* OVS_KEY_ATTR_SKB_MARK */
 375                 + nla_total_size(12)  /* OVS_KEY_ATTR_ETHERNET */
 376                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 377                 + nla_total_size(4)   /* OVS_KEY_ATTR_8021Q */
 378                 + nla_total_size(0)   /* OVS_KEY_ATTR_ENCAP */
 379                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 380                 + nla_total_size(40)  /* OVS_KEY_ATTR_IPV6 */
 381                 + nla_total_size(2)   /* OVS_KEY_ATTR_ICMPV6 */
 382                 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
 383 }
 384
 385 static size_t upcall_msg_size(const struct sk_buff *skb,
 386                               const struct nlattr *userdata)
 387 {
 388         size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
 389                 + nla_total_size(skb->len) /* OVS_PACKET_ATTR_PACKET */
 390                 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
 391
 392         /* OVS_PACKET_ATTR_USERDATA */
 393         if (userdata)
 394                 size += NLA_ALIGN(userdata->nla_len);
 395
 396         return size;
 397 }
 398
 399 static int queue_userspace_packet(struct net *net, int dp_ifindex,
 400                                   struct sk_buff *skb,
 401                                   const struct dp_upcall_info *upcall_info)
 402 {
 403         struct ovs_header *upcall;
 404         struct sk_buff *nskb = NULL;
 405         struct sk_buff *user_skb; /* to be queued to userspace */
 406         struct nlattr *nla;
 407         int err;
 408
 409         if (vlan_tx_tag_present(skb)) {
 410                 nskb = skb_clone(skb, GFP_ATOMIC);
 411                 if (!nskb)
 412                         return -ENOMEM;
 413
 414                 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb));
 415                 if (!nskb)
 416                         return -ENOMEM;
 417
 418                 vlan_set_tci(nskb, 0);
 419
 420                 skb = nskb;
 421         }
 422
 423         if (nla_attr_size(skb->len) > USHRT_MAX) {
 424                 err = -EFBIG;
 425                 goto out;
 426         }
 427
 428         user_skb = genlmsg_new(upcall_msg_size(skb, upcall_info->userdata), GFP_ATOMIC);
 429         if (!user_skb) {
 430                 err = -ENOMEM;
 431                 goto out;
 432         }
 433
 434         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
 435                              0, upcall_info->cmd);
 436         upcall->dp_ifindex = dp_ifindex;
 437
 438         nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
 439         ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb);
 440         nla_nest_end(user_skb, nla);
 441
 442         if (upcall_info->userdata)
 443                 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
 444                           nla_len(upcall_info->userdata),
 445                           nla_data(upcall_info->userdata));
 446
 447         nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
 448
 449         skb_copy_and_csum_dev(skb, nla_data(nla));
 450
 451         genlmsg_end(user_skb, upcall);
 452         err = genlmsg_unicast(net, user_skb, upcall_info->portid);
 453
 454 out:
 455         kfree_skb(nskb);
 456         return err;
 457 }
 458
 459 static void clear_stats(struct sw_flow *flow)
 460 {
 461         flow->used = 0;
 462         flow->tcp_flags = 0;
 463         flow->packet_count = 0;
 464         flow->byte_count = 0;
 465 }
 466
 467 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 468 {
 469         struct ovs_header *ovs_header = info->userhdr;
 470         struct nlattr **a = info->attrs;
 471         struct sw_flow_actions *acts;
 472         struct sk_buff *packet;
 473         struct sw_flow *flow;
 474         struct datapath *dp;
 475         struct ethhdr *eth;
 476         int len;
 477         int err;
 478
 479         err = -EINVAL;
 480         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 481             !a[OVS_PACKET_ATTR_ACTIONS])
 482                 goto err;
 483
 484         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 485         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 486         err = -ENOMEM;
 487         if (!packet)
 488                 goto err;
 489         skb_reserve(packet, NET_IP_ALIGN);
 490
 491         nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
 492
 493         skb_reset_mac_header(packet);
 494         eth = eth_hdr(packet);
 495
 496         /* Normally, setting the skb 'protocol' field would be handled by a
 497          * call to eth_type_trans(), but it assumes there's a sending
 498          * device, which we may not have. */
 499         if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
 500                 packet->protocol = eth->h_proto;
 501         else
 502                 packet->protocol = htons(ETH_P_802_2);
 503
 504         /* Build an sw_flow for sending this packet. */
 505         flow = ovs_flow_alloc();
 506         err = PTR_ERR(flow);
 507         if (IS_ERR(flow))
 508                 goto err_kfree_skb;
 509
 510         err = ovs_flow_extract(packet, -1, &flow->key);
 511         if (err)
 512                 goto err_flow_free;
 513
 514         err = ovs_nla_get_flow_metadata(flow, a[OVS_PACKET_ATTR_KEY]);
 515         if (err)
 516                 goto err_flow_free;
 517         acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
 518         err = PTR_ERR(acts);
 519         if (IS_ERR(acts))
 520                 goto err_flow_free;
 521
 522         err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
 523                                    &flow->key, 0, &acts);
 524         rcu_assign_pointer(flow->sf_acts, acts);
 525         if (err)
 526                 goto err_flow_free;
 527
 528         OVS_CB(packet)->flow = flow;
 529         OVS_CB(packet)->pkt_key = &flow->key;
 530         packet->priority = flow->key.phy.priority;
 531         packet->mark = flow->key.phy.skb_mark;
 532
 533         rcu_read_lock();
 534         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 535         err = -ENODEV;
 536         if (!dp)
 537                 goto err_unlock;
 538
 539         local_bh_disable();
 540         err = ovs_execute_actions(dp, packet);
 541         local_bh_enable();
 542         rcu_read_unlock();
 543
 544         ovs_flow_free(flow, false);
 545         return err;
 546
 547 err_unlock:
 548         rcu_read_unlock();
 549 err_flow_free:
 550         ovs_flow_free(flow, false);
 551 err_kfree_skb:
 552         kfree_skb(packet);
 553 err:
 554         return err;
 555 }
 556
 557 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 558         [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
 559         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 560         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 561 };
 562
 563 static struct genl_ops dp_packet_genl_ops[] = {
 564         { .cmd = OVS_PACKET_CMD_EXECUTE,
 565           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 566           .policy = packet_policy,
 567           .doit = ovs_packet_cmd_execute
 568         }
 569 };
 570
 571 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats,
 572                          struct ovs_dp_megaflow_stats *mega_stats)
 573 {
 574         int i;
 575
 576         memset(mega_stats, 0, sizeof(*mega_stats));
 577
 578         stats->n_flows = ovs_flow_tbl_count(&dp->table);
 579         mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
 580
 581         stats->n_hit = stats->n_missed = stats->n_lost = 0;
 582
 583         for_each_possible_cpu(i) {
 584                 const struct dp_stats_percpu *percpu_stats;
 585                 struct dp_stats_percpu local_stats;
 586                 unsigned int start;
 587
 588                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 589
 590                 do {
 591                         start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
 592                         local_stats = *percpu_stats;
 593                 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
 594
 595                 stats->n_hit += local_stats.n_hit;
 596                 stats->n_missed += local_stats.n_missed;
 597                 stats->n_lost += local_stats.n_lost;
 598                 mega_stats->n_mask_hit += local_stats.n_mask_hit;
 599         }
 600 }
 601
 602 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
 603         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
 604         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
 605         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
 606 };
 607
 608 static struct genl_family dp_flow_genl_family = {
 609         .id = GENL_ID_GENERATE,
 610         .hdrsize = sizeof(struct ovs_header),
 611         .name = OVS_FLOW_FAMILY,
 612         .version = OVS_FLOW_VERSION,
 613         .maxattr = OVS_FLOW_ATTR_MAX,
 614         .netnsok = true,
 615          SET_PARALLEL_OPS
 616 };
 617
 618 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
 619         .name = OVS_FLOW_MCGROUP
 620 };
 621
 622 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
 623 {
 624         return NLMSG_ALIGN(sizeof(struct ovs_header))
 625                 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
 626                 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
 627                 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
 628                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
 629                 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
 630                 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
 631 }
 632
 633 /* Called with ovs_mutex. */
 634 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
 635                                   struct sk_buff *skb, u32 portid,
 636                                   u32 seq, u32 flags, u8 cmd)
 637 {
 638         const int skb_orig_len = skb->len;
 639         struct nlattr *start;
 640         struct ovs_flow_stats stats;
 641         struct ovs_header *ovs_header;
 642         struct nlattr *nla;
 643         unsigned long used;
 644         u8 tcp_flags;
 645         int err;
 646
 647         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
 648         if (!ovs_header)
 649                 return -EMSGSIZE;
 650
 651         ovs_header->dp_ifindex = get_dpifindex(dp);
 652
 653         /* Fill flow key. */
 654         nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
 655         if (!nla)
 656                 goto nla_put_failure;
 657
 658         err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb);
 659         if (err)
 660                 goto error;
 661         nla_nest_end(skb, nla);
 662
 663         nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
 664         if (!nla)
 665                 goto nla_put_failure;
 666
 667         err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb);
 668         if (err)
 669                 goto error;
 670
 671         nla_nest_end(skb, nla);
 672
 673         spin_lock_bh(&flow->lock);
 674         used = flow->used;
 675         stats.n_packets = flow->packet_count;
 676         stats.n_bytes = flow->byte_count;
 677         tcp_flags = flow->tcp_flags;
 678         spin_unlock_bh(&flow->lock);
 679
 680         if (used &&
 681             nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
 682                 goto nla_put_failure;
 683
 684         if (stats.n_packets &&
 685             nla_put(skb, OVS_FLOW_ATTR_STATS,
 686                     sizeof(struct ovs_flow_stats), &stats))
 687                 goto nla_put_failure;
 688
 689         if (tcp_flags &&
 690             nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
 691                 goto nla_put_failure;
 692
 693         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 694          * this is the first flow to be dumped into 'skb'.  This is unusual for
 695          * Netlink but individual action lists can be longer than
 696          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 697          * The userspace caller can always fetch the actions separately if it
 698          * really wants them.  (Most userspace callers in fact don't care.)
 699          *
 700          * This can only fail for dump operations because the skb is always
 701          * properly sized for single flows.
 702          */
 703         start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
 704         if (start) {
 705                 const struct sw_flow_actions *sf_acts;
 706
 707                 sf_acts = rcu_dereference_check(flow->sf_acts,
 708                                                 lockdep_ovsl_is_held());
 709
 710                 err = ovs_nla_put_actions(sf_acts->actions,
 711                                           sf_acts->actions_len, skb);
 712                 if (!err)
 713                         nla_nest_end(skb, start);
 714                 else {
 715                         if (skb_orig_len)
 716                                 goto error;
 717
 718                         nla_nest_cancel(skb, start);
 719                 }
 720         } else if (skb_orig_len)
 721                 goto nla_put_failure;
 722
 723         return genlmsg_end(skb, ovs_header);
 724
 725 nla_put_failure:
 726         err = -EMSGSIZE;
 727 error:
 728         genlmsg_cancel(skb, ovs_header);
 729         return err;
 730 }
 731
 732 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
 733 {
 734         const struct sw_flow_actions *sf_acts;
 735
 736         sf_acts = ovsl_dereference(flow->sf_acts);
 737
 738         return genlmsg_new(ovs_flow_cmd_msg_size(sf_acts), GFP_KERNEL);
 739 }
 740
 741 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
 742                                                struct datapath *dp,
 743                                                u32 portid, u32 seq, u8 cmd)
 744 {
 745         struct sk_buff *skb;
 746         int retval;
 747
 748         skb = ovs_flow_cmd_alloc_info(flow);
 749         if (!skb)
 750                 return ERR_PTR(-ENOMEM);
 751
 752         retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
 753         BUG_ON(retval < 0);
 754         return skb;
 755 }
 756
 757 static struct sw_flow *__ovs_flow_tbl_lookup(struct flow_table *tbl,
 758                                               const struct sw_flow_key *key)
 759 {
 760         u32 __always_unused n_mask_hit;
 761
 762         return ovs_flow_tbl_lookup(tbl, key, &n_mask_hit);
 763 }
 764
 765 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
 766 {
 767         struct nlattr **a = info->attrs;
 768         struct ovs_header *ovs_header = info->userhdr;
 769         struct sw_flow_key key, masked_key;
 770         struct sw_flow *flow = NULL;
 771         struct sw_flow_mask mask;
 772         struct sk_buff *reply;
 773         struct datapath *dp;
 774         struct sw_flow_actions *acts = NULL;
 775         struct sw_flow_match match;
 776         int error;
 777
 778         /* Extract key. */
 779         error = -EINVAL;
 780         if (!a[OVS_FLOW_ATTR_KEY])
 781                 goto error;
 782
 783         ovs_match_init(&match, &key, &mask);
 784         error = ovs_nla_get_match(&match,
 785                                   a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
 786         if (error)
 787                 goto error;
 788
 789         /* Validate actions. */
 790         if (a[OVS_FLOW_ATTR_ACTIONS]) {
 791                 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
 792                 error = PTR_ERR(acts);
 793                 if (IS_ERR(acts))
 794                         goto error;
 795
 796                 ovs_flow_mask_key(&masked_key, &key, &mask);
 797                 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS],
 798                                              &masked_key, 0, &acts);
 799                 if (error) {
 800                         OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
 801                         goto err_kfree;
 802                 }
 803         } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
 804                 error = -EINVAL;
 805                 goto error;
 806         }
 807
 808         ovs_lock();
 809         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 810         error = -ENODEV;
 811         if (!dp)
 812                 goto err_unlock_ovs;
 813
 814         /* Check if this is a duplicate flow */
 815         flow = __ovs_flow_tbl_lookup(&dp->table, &key);
 816         if (!flow) {
 817                 /* Bail out if we're not allowed to create a new flow. */
 818                 error = -ENOENT;
 819                 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
 820                         goto err_unlock_ovs;
 821
 822                 /* Allocate flow. */
 823                 flow = ovs_flow_alloc();
 824                 if (IS_ERR(flow)) {
 825                         error = PTR_ERR(flow);
 826                         goto err_unlock_ovs;
 827                 }
 828                 clear_stats(flow);
 829
 830                 flow->key = masked_key;
 831                 flow->unmasked_key = key;
 832                 rcu_assign_pointer(flow->sf_acts, acts);
 833
 834                 /* Put flow in bucket. */
 835                 error = ovs_flow_tbl_insert(&dp->table, flow, &mask);
 836                 if (error) {
 837                         acts = NULL;
 838                         goto err_flow_free;
 839                 }
 840
 841                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
 842                                                 info->snd_seq, OVS_FLOW_CMD_NEW);
 843         } else {
 844                 /* We found a matching flow. */
 845                 struct sw_flow_actions *old_acts;
 846
 847                 /* Bail out if we're not allowed to modify an existing flow.
 848                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
 849                  * because Generic Netlink treats the latter as a dump
 850                  * request.  We also accept NLM_F_EXCL in case that bug ever
 851                  * gets fixed.
 852                  */
 853                 error = -EEXIST;
 854                 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
 855                     info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
 856                         goto err_unlock_ovs;
 857
 858                 /* The unmasked key has to be the same for flow updates. */
 859                 error = -EINVAL;
 860                 if (!ovs_flow_cmp_unmasked_key(flow, &match)) {
 861                         OVS_NLERR("Flow modification message rejected, unmasked key does not match.\n");
 862                         goto err_unlock_ovs;
 863                 }
 864
 865                 /* Update actions. */
 866                 old_acts = ovsl_dereference(flow->sf_acts);
 867                 rcu_assign_pointer(flow->sf_acts, acts);
 868                 ovs_nla_free_flow_actions(old_acts);
 869
 870                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
 871                                                info->snd_seq, OVS_FLOW_CMD_NEW);
 872
 873                 /* Clear stats. */
 874                 if (a[OVS_FLOW_ATTR_CLEAR]) {
 875                         spin_lock_bh(&flow->lock);
 876                         clear_stats(flow);
 877                         spin_unlock_bh(&flow->lock);
 878                 }
 879         }
 880         ovs_unlock();
 881
 882         if (!IS_ERR(reply))
 883                 ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
 884         else
 885                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
 886                                 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
 887         return 0;
 888
 889 err_flow_free:
 890         ovs_flow_free(flow, false);
 891 err_unlock_ovs:
 892         ovs_unlock();
 893 err_kfree:
 894         kfree(acts);
 895 error:
 896         return error;
 897 }
 898
 899 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
 900 {
 901         struct nlattr **a = info->attrs;
 902         struct ovs_header *ovs_header = info->userhdr;
 903         struct sw_flow_key key;
 904         struct sk_buff *reply;
 905         struct sw_flow *flow;
 906         struct datapath *dp;
 907         struct sw_flow_match match;
 908         int err;
 909
 910         if (!a[OVS_FLOW_ATTR_KEY]) {
 911                 OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
 912                 return -EINVAL;
 913         }
 914
 915         ovs_match_init(&match, &key, NULL);
 916         err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
 917         if (err)
 918                 return err;
 919
 920         ovs_lock();
 921         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 922         if (!dp) {
 923                 err = -ENODEV;
 924                 goto unlock;
 925         }
 926
 927         flow = __ovs_flow_tbl_lookup(&dp->table, &key);
 928         if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) {
 929                 err = -ENOENT;
 930                 goto unlock;
 931         }
 932
 933         reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
 934                                         info->snd_seq, OVS_FLOW_CMD_NEW);
 935         if (IS_ERR(reply)) {
 936                 err = PTR_ERR(reply);
 937                 goto unlock;
 938         }
 939
 940         ovs_unlock();
 941         return genlmsg_reply(reply, info);
 942 unlock:
 943         ovs_unlock();
 944         return err;
 945 }
 946
 947 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
 948 {
 949         struct nlattr **a = info->attrs;
 950         struct ovs_header *ovs_header = info->userhdr;
 951         struct sw_flow_key key;
 952         struct sk_buff *reply;
 953         struct sw_flow *flow;
 954         struct datapath *dp;
 955         struct sw_flow_match match;
 956         int err;
 957
 958         ovs_lock();
 959         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 960         if (!dp) {
 961                 err = -ENODEV;
 962                 goto unlock;
 963         }
 964
 965         if (!a[OVS_FLOW_ATTR_KEY]) {
 966                 err = ovs_flow_tbl_flush(&dp->table);
 967                 goto unlock;
 968         }
 969
 970         ovs_match_init(&match, &key, NULL);
 971         err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
 972         if (err)
 973                 goto unlock;
 974
 975         flow = __ovs_flow_tbl_lookup(&dp->table, &key);
 976         if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) {
 977                 err = -ENOENT;
 978                 goto unlock;
 979         }
 980
 981         reply = ovs_flow_cmd_alloc_info(flow);
 982         if (!reply) {
 983                 err = -ENOMEM;
 984                 goto unlock;
 985         }
 986
 987         ovs_flow_tbl_remove(&dp->table, flow);
 988
 989         err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
 990                                      info->snd_seq, 0, OVS_FLOW_CMD_DEL);
 991         BUG_ON(err < 0);
 992
 993         ovs_flow_free(flow, true);
 994         ovs_unlock();
 995
 996         ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
 997         return 0;
 998 unlock:
 999         ovs_unlock();
1000         return err;
1001 }
1002
1003 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1004 {
1005         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1006         struct table_instance *ti;
1007         struct datapath *dp;
1008
1009         rcu_read_lock();
1010         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1011         if (!dp) {
1012                 rcu_read_unlock();
1013                 return -ENODEV;
1014         }
1015
1016         ti = rcu_dereference(dp->table.ti);
1017         for (;;) {
1018                 struct sw_flow *flow;
1019                 u32 bucket, obj;
1020
1021                 bucket = cb->args[0];
1022                 obj = cb->args[1];
1023                 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1024                 if (!flow)
1025                         break;
1026
1027                 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1028                                            NETLINK_CB(cb->skb).portid,
1029                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1030                                            OVS_FLOW_CMD_NEW) < 0)
1031                         break;
1032
1033                 cb->args[0] = bucket;
1034                 cb->args[1] = obj;
1035         }
1036         rcu_read_unlock();
1037         return skb->len;
1038 }
1039
1040 static struct genl_ops dp_flow_genl_ops[] = {
1041         { .cmd = OVS_FLOW_CMD_NEW,
1042           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1043           .policy = flow_policy,
1044           .doit = ovs_flow_cmd_new_or_set
1045         },
1046         { .cmd = OVS_FLOW_CMD_DEL,
1047           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1048           .policy = flow_policy,
1049           .doit = ovs_flow_cmd_del
1050         },
1051         { .cmd = OVS_FLOW_CMD_GET,
1052           .flags = 0,               /* OK for unprivileged users. */
1053           .policy = flow_policy,
1054           .doit = ovs_flow_cmd_get,
1055           .dumpit = ovs_flow_cmd_dump
1056         },
1057         { .cmd = OVS_FLOW_CMD_SET,
1058           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1059           .policy = flow_policy,
1060           .doit = ovs_flow_cmd_new_or_set,
1061         },
1062 };
1063
1064 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1065         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1066         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1067 };
1068
1069 static struct genl_family dp_datapath_genl_family = {
1070         .id = GENL_ID_GENERATE,
1071         .hdrsize = sizeof(struct ovs_header),
1072         .name = OVS_DATAPATH_FAMILY,
1073         .version = OVS_DATAPATH_VERSION,
1074         .maxattr = OVS_DP_ATTR_MAX,
1075         .netnsok = true,
1076          SET_PARALLEL_OPS
1077 };
1078
1079 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1080         .name = OVS_DATAPATH_MCGROUP
1081 };
1082
1083 static size_t ovs_dp_cmd_msg_size(void)
1084 {
1085         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1086
1087         msgsize += nla_total_size(IFNAMSIZ);
1088         msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1089         msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1090
1091         return msgsize;
1092 }
1093
1094 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1095                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1096 {
1097         struct ovs_header *ovs_header;
1098         struct ovs_dp_stats dp_stats;
1099         struct ovs_dp_megaflow_stats dp_megaflow_stats;
1100         int err;
1101
1102         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1103                                    flags, cmd);
1104         if (!ovs_header)
1105                 goto error;
1106
1107         ovs_header->dp_ifindex = get_dpifindex(dp);
1108
1109         rcu_read_lock();
1110         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1111         rcu_read_unlock();
1112         if (err)
1113                 goto nla_put_failure;
1114
1115         get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1116         if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1117                         &dp_stats))
1118                 goto nla_put_failure;
1119
1120         if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1121                         sizeof(struct ovs_dp_megaflow_stats),
1122                         &dp_megaflow_stats))
1123                 goto nla_put_failure;
1124
1125         return genlmsg_end(skb, ovs_header);
1126
1127 nla_put_failure:
1128         genlmsg_cancel(skb, ovs_header);
1129 error:
1130         return -EMSGSIZE;
1131 }
1132
1133 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
1134                                              u32 seq, u8 cmd)
1135 {
1136         struct sk_buff *skb;
1137         int retval;
1138
1139         skb = genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1140         if (!skb)
1141                 return ERR_PTR(-ENOMEM);
1142
1143         retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
1144         if (retval < 0) {
1145                 kfree_skb(skb);
1146                 return ERR_PTR(retval);
1147         }
1148         return skb;
1149 }
1150
1151 /* Called with ovs_mutex. */
1152 static struct datapath *lookup_datapath(struct net *net,
1153                                         struct ovs_header *ovs_header,
1154                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1155 {
1156         struct datapath *dp;
1157
1158         if (!a[OVS_DP_ATTR_NAME])
1159                 dp = get_dp(net, ovs_header->dp_ifindex);
1160         else {
1161                 struct vport *vport;
1162
1163                 rcu_read_lock();
1164                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1165                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1166                 rcu_read_unlock();
1167         }
1168         return dp ? dp : ERR_PTR(-ENODEV);
1169 }
1170
1171 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1172 {
1173         struct nlattr **a = info->attrs;
1174         struct vport_parms parms;
1175         struct sk_buff *reply;
1176         struct datapath *dp;
1177         struct vport *vport;
1178         struct ovs_net *ovs_net;
1179         int err, i;
1180
1181         err = -EINVAL;
1182         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1183                 goto err;
1184
1185         ovs_lock();
1186
1187         err = -ENOMEM;
1188         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1189         if (dp == NULL)
1190                 goto err_unlock_ovs;
1191
1192         ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1193
1194         /* Allocate table. */
1195         err = ovs_flow_tbl_init(&dp->table);
1196         if (err)
1197                 goto err_free_dp;
1198
1199         dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1200         if (!dp->stats_percpu) {
1201                 err = -ENOMEM;
1202                 goto err_destroy_table;
1203         }
1204
1205         dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1206                             GFP_KERNEL);
1207         if (!dp->ports) {
1208                 err = -ENOMEM;
1209                 goto err_destroy_percpu;
1210         }
1211
1212         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1213                 INIT_HLIST_HEAD(&dp->ports[i]);
1214
1215         /* Set up our datapath device. */
1216         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1217         parms.type = OVS_VPORT_TYPE_INTERNAL;
1218         parms.options = NULL;
1219         parms.dp = dp;
1220         parms.port_no = OVSP_LOCAL;
1221         parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1222
1223         vport = new_vport(&parms);
1224         if (IS_ERR(vport)) {
1225                 err = PTR_ERR(vport);
1226                 if (err == -EBUSY)
1227                         err = -EEXIST;
1228
1229                 goto err_destroy_ports_array;
1230         }
1231
1232         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1233                                       info->snd_seq, OVS_DP_CMD_NEW);
1234         err = PTR_ERR(reply);
1235         if (IS_ERR(reply))
1236                 goto err_destroy_local_port;
1237
1238         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1239         list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1240
1241         ovs_unlock();
1242
1243         ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1244         return 0;
1245
1246 err_destroy_local_port:
1247         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1248 err_destroy_ports_array:
1249         kfree(dp->ports);
1250 err_destroy_percpu:
1251         free_percpu(dp->stats_percpu);
1252 err_destroy_table:
1253         ovs_flow_tbl_destroy(&dp->table);
1254 err_free_dp:
1255         release_net(ovs_dp_get_net(dp));
1256         kfree(dp);
1257 err_unlock_ovs:
1258         ovs_unlock();
1259 err:
1260         return err;
1261 }
1262
1263 /* Called with ovs_mutex. */
1264 static void __dp_destroy(struct datapath *dp)
1265 {
1266         int i;
1267
1268         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1269                 struct vport *vport;
1270                 struct hlist_node *n;
1271
1272                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1273                         if (vport->port_no != OVSP_LOCAL)
1274                                 ovs_dp_detach_port(vport);
1275         }
1276
1277         list_del_rcu(&dp->list_node);
1278
1279         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1280          * all port in datapath are destroyed first before freeing datapath.
1281          */
1282         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1283
1284         call_rcu(&dp->rcu, destroy_dp_rcu);
1285 }
1286
1287 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1288 {
1289         struct sk_buff *reply;
1290         struct datapath *dp;
1291         int err;
1292
1293         ovs_lock();
1294         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1295         err = PTR_ERR(dp);
1296         if (IS_ERR(dp))
1297                 goto unlock;
1298
1299         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1300                                       info->snd_seq, OVS_DP_CMD_DEL);
1301         err = PTR_ERR(reply);
1302         if (IS_ERR(reply))
1303                 goto unlock;
1304
1305         __dp_destroy(dp);
1306         ovs_unlock();
1307
1308         ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1309
1310         return 0;
1311 unlock:
1312         ovs_unlock();
1313         return err;
1314 }
1315
1316 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1317 {
1318         struct sk_buff *reply;
1319         struct datapath *dp;
1320         int err;
1321
1322         ovs_lock();
1323         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1324         err = PTR_ERR(dp);
1325         if (IS_ERR(dp))
1326                 goto unlock;
1327
1328         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1329                                       info->snd_seq, OVS_DP_CMD_NEW);
1330         if (IS_ERR(reply)) {
1331                 err = PTR_ERR(reply);
1332                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1333                                 ovs_dp_datapath_multicast_group.id, err);
1334                 err = 0;
1335                 goto unlock;
1336         }
1337
1338         ovs_unlock();
1339         ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1340
1341         return 0;
1342 unlock:
1343         ovs_unlock();
1344         return err;
1345 }
1346
1347 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1348 {
1349         struct sk_buff *reply;
1350         struct datapath *dp;
1351         int err;
1352
1353         ovs_lock();
1354         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1355         if (IS_ERR(dp)) {
1356                 err = PTR_ERR(dp);
1357                 goto unlock;
1358         }
1359
1360         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1361                                       info->snd_seq, OVS_DP_CMD_NEW);
1362         if (IS_ERR(reply)) {
1363                 err = PTR_ERR(reply);
1364                 goto unlock;
1365         }
1366
1367         ovs_unlock();
1368         return genlmsg_reply(reply, info);
1369
1370 unlock:
1371         ovs_unlock();
1372         return err;
1373 }
1374
1375 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1376 {
1377         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1378         struct datapath *dp;
1379         int skip = cb->args[0];
1380         int i = 0;
1381
1382         rcu_read_lock();
1383         list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1384                 if (i >= skip &&
1385                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1386                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1387                                          OVS_DP_CMD_NEW) < 0)
1388                         break;
1389                 i++;
1390         }
1391         rcu_read_unlock();
1392
1393         cb->args[0] = i;
1394
1395         return skb->len;
1396 }
1397
1398 static struct genl_ops dp_datapath_genl_ops[] = {
1399         { .cmd = OVS_DP_CMD_NEW,
1400           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1401           .policy = datapath_policy,
1402           .doit = ovs_dp_cmd_new
1403         },
1404         { .cmd = OVS_DP_CMD_DEL,
1405           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1406           .policy = datapath_policy,
1407           .doit = ovs_dp_cmd_del
1408         },
1409         { .cmd = OVS_DP_CMD_GET,
1410           .flags = 0,               /* OK for unprivileged users. */
1411           .policy = datapath_policy,
1412           .doit = ovs_dp_cmd_get,
1413           .dumpit = ovs_dp_cmd_dump
1414         },
1415         { .cmd = OVS_DP_CMD_SET,
1416           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1417           .policy = datapath_policy,
1418           .doit = ovs_dp_cmd_set,
1419         },
1420 };
1421
1422 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1423         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1424         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1425         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1426         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1427         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1428         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1429 };
1430
1431 static struct genl_family dp_vport_genl_family = {
1432         .id = GENL_ID_GENERATE,
1433         .hdrsize = sizeof(struct ovs_header),
1434         .name = OVS_VPORT_FAMILY,
1435         .version = OVS_VPORT_VERSION,
1436         .maxattr = OVS_VPORT_ATTR_MAX,
1437         .netnsok = true,
1438          SET_PARALLEL_OPS
1439 };
1440
1441 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1442         .name = OVS_VPORT_MCGROUP
1443 };
1444
1445 /* Called with ovs_mutex or RCU read lock. */
1446 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1447                                    u32 portid, u32 seq, u32 flags, u8 cmd)
1448 {
1449         struct ovs_header *ovs_header;
1450         struct ovs_vport_stats vport_stats;
1451         int err;
1452
1453         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1454                                  flags, cmd);
1455         if (!ovs_header)
1456                 return -EMSGSIZE;
1457
1458         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1459
1460         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1461             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1462             nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1463             nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
1464                 goto nla_put_failure;
1465
1466         ovs_vport_get_stats(vport, &vport_stats);
1467         if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1468                     &vport_stats))
1469                 goto nla_put_failure;
1470
1471         err = ovs_vport_get_options(vport, skb);
1472         if (err == -EMSGSIZE)
1473                 goto error;
1474
1475         return genlmsg_end(skb, ovs_header);
1476
1477 nla_put_failure:
1478         err = -EMSGSIZE;
1479 error:
1480         genlmsg_cancel(skb, ovs_header);
1481         return err;
1482 }
1483
1484 /* Called with ovs_mutex or RCU read lock. */
1485 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1486                                          u32 seq, u8 cmd)
1487 {
1488         struct sk_buff *skb;
1489         int retval;
1490
1491         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1492         if (!skb)
1493                 return ERR_PTR(-ENOMEM);
1494
1495         retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1496         BUG_ON(retval < 0);
1497
1498         return skb;
1499 }
1500
1501 /* Called with ovs_mutex or RCU read lock. */
1502 static struct vport *lookup_vport(struct net *net,
1503                                   struct ovs_header *ovs_header,
1504                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1505 {
1506         struct datapath *dp;
1507         struct vport *vport;
1508
1509         if (a[OVS_VPORT_ATTR_NAME]) {
1510                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1511                 if (!vport)
1512                         return ERR_PTR(-ENODEV);
1513                 if (ovs_header->dp_ifindex &&
1514                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1515                         return ERR_PTR(-ENODEV);
1516                 return vport;
1517         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1518                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1519
1520                 if (port_no >= DP_MAX_PORTS)
1521                         return ERR_PTR(-EFBIG);
1522
1523                 dp = get_dp(net, ovs_header->dp_ifindex);
1524                 if (!dp)
1525                         return ERR_PTR(-ENODEV);
1526
1527                 vport = ovs_vport_ovsl_rcu(dp, port_no);
1528                 if (!vport)
1529                         return ERR_PTR(-ENODEV);
1530                 return vport;
1531         } else
1532                 return ERR_PTR(-EINVAL);
1533 }
1534
1535 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1536 {
1537         struct nlattr **a = info->attrs;
1538         struct ovs_header *ovs_header = info->userhdr;
1539         struct vport_parms parms;
1540         struct sk_buff *reply;
1541         struct vport *vport;
1542         struct datapath *dp;
1543         u32 port_no;
1544         int err;
1545
1546         err = -EINVAL;
1547         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1548             !a[OVS_VPORT_ATTR_UPCALL_PID])
1549                 goto exit;
1550
1551         ovs_lock();
1552         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1553         err = -ENODEV;
1554         if (!dp)
1555                 goto exit_unlock;
1556
1557         if (a[OVS_VPORT_ATTR_PORT_NO]) {
1558                 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1559
1560                 err = -EFBIG;
1561                 if (port_no >= DP_MAX_PORTS)
1562                         goto exit_unlock;
1563
1564                 vport = ovs_vport_ovsl(dp, port_no);
1565                 err = -EBUSY;
1566                 if (vport)
1567                         goto exit_unlock;
1568         } else {
1569                 for (port_no = 1; ; port_no++) {
1570                         if (port_no >= DP_MAX_PORTS) {
1571                                 err = -EFBIG;
1572                                 goto exit_unlock;
1573                         }
1574                         vport = ovs_vport_ovsl(dp, port_no);
1575                         if (!vport)
1576                                 break;
1577                 }
1578         }
1579
1580         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1581         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1582         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1583         parms.dp = dp;
1584         parms.port_no = port_no;
1585         parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1586
1587         vport = new_vport(&parms);
1588         err = PTR_ERR(vport);
1589         if (IS_ERR(vport))
1590                 goto exit_unlock;
1591
1592         err = 0;
1593         if (a[OVS_VPORT_ATTR_STATS])
1594                 ovs_vport_set_stats(vport, nla_data(a[OVS_VPORT_ATTR_STATS]));
1595
1596         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1597                                          OVS_VPORT_CMD_NEW);
1598         if (IS_ERR(reply)) {
1599                 err = PTR_ERR(reply);
1600                 ovs_dp_detach_port(vport);
1601                 goto exit_unlock;
1602         }
1603
1604         ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
1605
1606 exit_unlock:
1607         ovs_unlock();
1608 exit:
1609         return err;
1610 }
1611
1612 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1613 {
1614         struct nlattr **a = info->attrs;
1615         struct sk_buff *reply;
1616         struct vport *vport;
1617         int err;
1618
1619         ovs_lock();
1620         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1621         err = PTR_ERR(vport);
1622         if (IS_ERR(vport))
1623                 goto exit_unlock;
1624
1625         if (a[OVS_VPORT_ATTR_TYPE] &&
1626             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1627                 err = -EINVAL;
1628                 goto exit_unlock;
1629         }
1630
1631         reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1632         if (!reply) {
1633                 err = -ENOMEM;
1634                 goto exit_unlock;
1635         }
1636
1637         if (a[OVS_VPORT_ATTR_OPTIONS]) {
1638                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1639                 if (err)
1640                         goto exit_free;
1641         }
1642
1643         if (a[OVS_VPORT_ATTR_STATS])
1644                 ovs_vport_set_stats(vport, nla_data(a[OVS_VPORT_ATTR_STATS]));
1645
1646         if (a[OVS_VPORT_ATTR_UPCALL_PID])
1647                 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1648
1649         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1650                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1651         BUG_ON(err < 0);
1652
1653         ovs_unlock();
1654         ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
1655         return 0;
1656
1657 exit_free:
1658         kfree_skb(reply);
1659 exit_unlock:
1660         ovs_unlock();
1661         return err;
1662 }
1663
1664 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1665 {
1666         struct nlattr **a = info->attrs;
1667         struct sk_buff *reply;
1668         struct vport *vport;
1669         int err;
1670
1671         ovs_lock();
1672         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1673         err = PTR_ERR(vport);
1674         if (IS_ERR(vport))
1675                 goto exit_unlock;
1676
1677         if (vport->port_no == OVSP_LOCAL) {
1678                 err = -EINVAL;
1679                 goto exit_unlock;
1680         }
1681
1682         reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
1683                                          info->snd_seq, OVS_VPORT_CMD_DEL);
1684         err = PTR_ERR(reply);
1685         if (IS_ERR(reply))
1686                 goto exit_unlock;
1687
1688         err = 0;
1689         ovs_dp_detach_port(vport);
1690
1691         ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
1692
1693 exit_unlock:
1694         ovs_unlock();
1695         return err;
1696 }
1697
1698 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1699 {
1700         struct nlattr **a = info->attrs;
1701         struct ovs_header *ovs_header = info->userhdr;
1702         struct sk_buff *reply;
1703         struct vport *vport;
1704         int err;
1705
1706         rcu_read_lock();
1707         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1708         err = PTR_ERR(vport);
1709         if (IS_ERR(vport))
1710                 goto exit_unlock;
1711
1712         reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
1713                                          info->snd_seq, OVS_VPORT_CMD_NEW);
1714         err = PTR_ERR(reply);
1715         if (IS_ERR(reply))
1716                 goto exit_unlock;
1717
1718         rcu_read_unlock();
1719
1720         return genlmsg_reply(reply, info);
1721
1722 exit_unlock:
1723         rcu_read_unlock();
1724         return err;
1725 }
1726
1727 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1728 {
1729         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1730         struct datapath *dp;
1731         int bucket = cb->args[0], skip = cb->args[1];
1732         int i, j = 0;
1733
1734         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1735         if (!dp)
1736                 return -ENODEV;
1737
1738         rcu_read_lock();
1739         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1740                 struct vport *vport;
1741
1742                 j = 0;
1743                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1744                         if (j >= skip &&
1745                             ovs_vport_cmd_fill_info(vport, skb,
1746                                                     NETLINK_CB(cb->skb).portid,
1747                                                     cb->nlh->nlmsg_seq,
1748                                                     NLM_F_MULTI,
1749                                                     OVS_VPORT_CMD_NEW) < 0)
1750                                 goto out;
1751
1752                         j++;
1753                 }
1754                 skip = 0;
1755         }
1756 out:
1757         rcu_read_unlock();
1758
1759         cb->args[0] = i;
1760         cb->args[1] = j;
1761
1762         return skb->len;
1763 }
1764
1765 static struct genl_ops dp_vport_genl_ops[] = {
1766         { .cmd = OVS_VPORT_CMD_NEW,
1767           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1768           .policy = vport_policy,
1769           .doit = ovs_vport_cmd_new
1770         },
1771         { .cmd = OVS_VPORT_CMD_DEL,
1772           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1773           .policy = vport_policy,
1774           .doit = ovs_vport_cmd_del
1775         },
1776         { .cmd = OVS_VPORT_CMD_GET,
1777           .flags = 0,               /* OK for unprivileged users. */
1778           .policy = vport_policy,
1779           .doit = ovs_vport_cmd_get,
1780           .dumpit = ovs_vport_cmd_dump
1781         },
1782         { .cmd = OVS_VPORT_CMD_SET,
1783           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1784           .policy = vport_policy,
1785           .doit = ovs_vport_cmd_set,
1786         },
1787 };
1788
1789 struct genl_family_and_ops {
1790         struct genl_family *family;
1791         struct genl_ops *ops;
1792         int n_ops;
1793         struct genl_multicast_group *group;
1794 };
1795
1796 static const struct genl_family_and_ops dp_genl_families[] = {
1797         { &dp_datapath_genl_family,
1798           dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1799           &ovs_dp_datapath_multicast_group },
1800         { &dp_vport_genl_family,
1801           dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1802           &ovs_dp_vport_multicast_group },
1803         { &dp_flow_genl_family,
1804           dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1805           &ovs_dp_flow_multicast_group },
1806         { &dp_packet_genl_family,
1807           dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1808           NULL },
1809 };
1810
1811 static void dp_unregister_genl(int n_families)
1812 {
1813         int i;
1814
1815         for (i = 0; i < n_families; i++)
1816                 genl_unregister_family(dp_genl_families[i].family);
1817 }
1818
1819 static int dp_register_genl(void)
1820 {
1821         int n_registered;
1822         int err;
1823         int i;
1824
1825         n_registered = 0;
1826         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1827                 const struct genl_family_and_ops *f = &dp_genl_families[i];
1828
1829                 err = genl_register_family_with_ops(f->family, f->ops,
1830                                                     f->n_ops);
1831                 if (err)
1832                         goto error;
1833                 n_registered++;
1834
1835                 if (f->group) {
1836                         err = genl_register_mc_group(f->family, f->group);
1837                         if (err)
1838                                 goto error;
1839                 }
1840         }
1841
1842         return 0;
1843
1844 error:
1845         dp_unregister_genl(n_registered);
1846         return err;
1847 }
1848
1849 static int __net_init ovs_init_net(struct net *net)
1850 {
1851         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1852
1853         INIT_LIST_HEAD(&ovs_net->dps);
1854         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
1855         return 0;
1856 }
1857
1858 static void __net_exit ovs_exit_net(struct net *net)
1859 {
1860         struct datapath *dp, *dp_next;
1861         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1862
1863         ovs_lock();
1864         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
1865                 __dp_destroy(dp);
1866         ovs_unlock();
1867
1868         cancel_work_sync(&ovs_net->dp_notify_work);
1869 }
1870
1871 static struct pernet_operations ovs_net_ops = {
1872         .init = ovs_init_net,
1873         .exit = ovs_exit_net,
1874         .id   = &ovs_net_id,
1875         .size = sizeof(struct ovs_net),
1876 };
1877
1878 DEFINE_COMPAT_PNET_REG_FUNC(device);
1879
1880 static int __init dp_init(void)
1881 {
1882         int err;
1883
1884         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
1885
1886         pr_info("Open vSwitch switching datapath %s, built "__DATE__" "__TIME__"\n",
1887                 VERSION);
1888
1889         err = ovs_flow_init();
1890         if (err)
1891                 goto error;
1892
1893         err = ovs_vport_init();
1894         if (err)
1895                 goto error_flow_exit;
1896
1897         err = register_pernet_device(&ovs_net_ops);
1898         if (err)
1899                 goto error_vport_exit;
1900
1901         err = register_netdevice_notifier(&ovs_dp_device_notifier);
1902         if (err)
1903                 goto error_netns_exit;
1904
1905         err = dp_register_genl();
1906         if (err < 0)
1907                 goto error_unreg_notifier;
1908
1909         return 0;
1910
1911 error_unreg_notifier:
1912         unregister_netdevice_notifier(&ovs_dp_device_notifier);
1913 error_netns_exit:
1914         unregister_pernet_device(&ovs_net_ops);
1915 error_vport_exit:
1916         ovs_vport_exit();
1917 error_flow_exit:
1918         ovs_flow_exit();
1919 error:
1920         return err;
1921 }
1922
1923 static void dp_cleanup(void)
1924 {
1925         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
1926         unregister_netdevice_notifier(&ovs_dp_device_notifier);
1927         unregister_pernet_device(&ovs_net_ops);
1928         rcu_barrier();
1929         ovs_vport_exit();
1930         ovs_flow_exit();
1931 }
1932
1933 module_init(dp_init);
1934 module_exit(dp_cleanup);
1935
1936 MODULE_DESCRIPTION("Open vSwitch switching datapath");
1937 MODULE_LICENSE("GPL");
1938 MODULE_VERSION(VERSION);