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 genl_family *family,
  65                        struct sk_buff *skb, struct genl_info *info)
  66 {
  67         genl_notify(family, skb, genl_info_net(info), info->snd_portid,
  68                     0, 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 datapath *dp, struct sk_buff *,
 112                              const struct dp_upcall_info *);
 113 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
 114                                   const struct dp_upcall_info *);
 115
 116 /* Must be called with rcu_read_lock or ovs_mutex. */
 117 static struct datapath *get_dp(struct net *net, int dp_ifindex)
 118 {
 119         struct datapath *dp = NULL;
 120         struct net_device *dev;
 121
 122         rcu_read_lock();
 123         dev = dev_get_by_index_rcu(net, dp_ifindex);
 124         if (dev) {
 125                 struct vport *vport = ovs_internal_dev_get_vport(dev);
 126                 if (vport)
 127                         dp = vport->dp;
 128         }
 129         rcu_read_unlock();
 130
 131         return dp;
 132 }
 133
 134 /* Must be called with rcu_read_lock or ovs_mutex. */
 135 static const char *ovs_dp_name(const struct datapath *dp)
 136 {
 137         struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
 138         return vport->ops->get_name(vport);
 139 }
 140
 141 static int get_dpifindex(struct datapath *dp)
 142 {
 143         struct vport *local;
 144         int ifindex;
 145
 146         rcu_read_lock();
 147
 148         local = ovs_vport_rcu(dp, OVSP_LOCAL);
 149         if (local)
 150                 ifindex = netdev_vport_priv(local)->dev->ifindex;
 151         else
 152                 ifindex = 0;
 153
 154         rcu_read_unlock();
 155
 156         return ifindex;
 157 }
 158
 159 static void destroy_dp_rcu(struct rcu_head *rcu)
 160 {
 161         struct datapath *dp = container_of(rcu, struct datapath, rcu);
 162
 163         ovs_flow_tbl_destroy(&dp->table);
 164         free_percpu(dp->stats_percpu);
 165         release_net(ovs_dp_get_net(dp));
 166         kfree(dp->ports);
 167         kfree(dp);
 168 }
 169
 170 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
 171                                             u16 port_no)
 172 {
 173         return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
 174 }
 175
 176 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
 177 {
 178         struct vport *vport;
 179         struct hlist_head *head;
 180
 181         head = vport_hash_bucket(dp, port_no);
 182         hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
 183                 if (vport->port_no == port_no)
 184                         return vport;
 185         }
 186         return NULL;
 187 }
 188
 189 /* Called with ovs_mutex. */
 190 static struct vport *new_vport(const struct vport_parms *parms)
 191 {
 192         struct vport *vport;
 193
 194         vport = ovs_vport_add(parms);
 195         if (!IS_ERR(vport)) {
 196                 struct datapath *dp = parms->dp;
 197                 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
 198
 199                 hlist_add_head_rcu(&vport->dp_hash_node, head);
 200         }
 201         return vport;
 202 }
 203
 204 void ovs_dp_detach_port(struct vport *p)
 205 {
 206         ASSERT_OVSL();
 207
 208         /* First drop references to device. */
 209         hlist_del_rcu(&p->dp_hash_node);
 210
 211         /* Then destroy it. */
 212         ovs_vport_del(p);
 213 }
 214
 215 /* Must be called with rcu_read_lock. */
 216 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
 217 {
 218         struct datapath *dp = p->dp;
 219         struct sw_flow *flow;
 220         struct dp_stats_percpu *stats;
 221         struct sw_flow_key key;
 222         u64 *stats_counter;
 223         u32 n_mask_hit;
 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_stats(&dp->table, &key, &n_mask_hit);
 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         ovs_flow_stats_update(OVS_CB(skb)->flow, skb);
 254         ovs_execute_actions(dp, skb);
 255         stats_counter = &stats->n_hit;
 256
 257 out:
 258         /* Update datapath statistics. */
 259         u64_stats_update_begin(&stats->sync);
 260         (*stats_counter)++;
 261         stats->n_mask_hit += n_mask_hit;
 262         u64_stats_update_end(&stats->sync);
 263 }
 264
 265 static struct genl_family dp_packet_genl_family = {
 266         .id = GENL_ID_GENERATE,
 267         .hdrsize = sizeof(struct ovs_header),
 268         .name = OVS_PACKET_FAMILY,
 269         .version = OVS_PACKET_VERSION,
 270         .maxattr = OVS_PACKET_ATTR_MAX,
 271         .netnsok = true,
 272         .parallel_ops = true,
 273 };
 274
 275 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
 276                   const struct dp_upcall_info *upcall_info)
 277 {
 278         struct dp_stats_percpu *stats;
 279         int err;
 280
 281         if (upcall_info->portid == 0) {
 282                 err = -ENOTCONN;
 283                 goto err;
 284         }
 285
 286         if (!skb_is_gso(skb))
 287                 err = queue_userspace_packet(dp, skb, upcall_info);
 288         else
 289                 err = queue_gso_packets(dp, skb, upcall_info);
 290         if (err)
 291                 goto err;
 292
 293         return 0;
 294
 295 err:
 296         stats = this_cpu_ptr(dp->stats_percpu);
 297
 298         u64_stats_update_begin(&stats->sync);
 299         stats->n_lost++;
 300         u64_stats_update_end(&stats->sync);
 301
 302         return err;
 303 }
 304
 305 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
 306                              const struct dp_upcall_info *upcall_info)
 307 {
 308         unsigned short gso_type = skb_shinfo(skb)->gso_type;
 309         struct dp_upcall_info later_info;
 310         struct sw_flow_key later_key;
 311         struct sk_buff *segs, *nskb;
 312         int err;
 313
 314         segs = __skb_gso_segment(skb, NETIF_F_SG, false);
 315         if (IS_ERR(segs))
 316                 return PTR_ERR(segs);
 317
 318         /* Queue all of the segments. */
 319         skb = segs;
 320         do {
 321                 err = queue_userspace_packet(dp, skb, upcall_info);
 322                 if (err)
 323                         break;
 324
 325                 if (skb == segs && gso_type & SKB_GSO_UDP) {
 326                         /* The initial flow key extracted by ovs_flow_extract()
 327                          * in this case is for a first fragment, so we need to
 328                          * properly mark later fragments.
 329                          */
 330                         later_key = *upcall_info->key;
 331                         later_key.ip.frag = OVS_FRAG_TYPE_LATER;
 332
 333                         later_info = *upcall_info;
 334                         later_info.key = &later_key;
 335                         upcall_info = &later_info;
 336                 }
 337         } while ((skb = skb->next));
 338
 339         /* Free all of the segments. */
 340         skb = segs;
 341         do {
 342                 nskb = skb->next;
 343                 if (err)
 344                         kfree_skb(skb);
 345                 else
 346                         consume_skb(skb);
 347         } while ((skb = nskb));
 348         return err;
 349 }
 350
 351 static size_t key_attr_size(void)
 352 {
 353         return    nla_total_size(4)   /* OVS_KEY_ATTR_PRIORITY */
 354                 + nla_total_size(0)   /* OVS_KEY_ATTR_TUNNEL */
 355                   + nla_total_size(8)   /* OVS_TUNNEL_KEY_ATTR_ID */
 356                   + nla_total_size(4)   /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
 357                   + nla_total_size(4)   /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
 358                   + nla_total_size(1)   /* OVS_TUNNEL_KEY_ATTR_TOS */
 359                   + nla_total_size(1)   /* OVS_TUNNEL_KEY_ATTR_TTL */
 360                   + nla_total_size(0)   /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
 361                   + nla_total_size(0)   /* OVS_TUNNEL_KEY_ATTR_CSUM */
 362                 + nla_total_size(4)   /* OVS_KEY_ATTR_IN_PORT */
 363                 + nla_total_size(4)   /* OVS_KEY_ATTR_SKB_MARK */
 364                 + nla_total_size(12)  /* OVS_KEY_ATTR_ETHERNET */
 365                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 366                 + nla_total_size(4)   /* OVS_KEY_ATTR_8021Q */
 367                 + nla_total_size(0)   /* OVS_KEY_ATTR_ENCAP */
 368                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 369                 + nla_total_size(40)  /* OVS_KEY_ATTR_IPV6 */
 370                 + nla_total_size(2)   /* OVS_KEY_ATTR_ICMPV6 */
 371                 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
 372 }
 373
 374 static size_t upcall_msg_size(const struct nlattr *userdata,
 375                               unsigned int hdrlen)
 376 {
 377         size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
 378                 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
 379                 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
 380
 381         /* OVS_PACKET_ATTR_USERDATA */
 382         if (userdata)
 383                 size += NLA_ALIGN(userdata->nla_len);
 384
 385         return size;
 386 }
 387
 388 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
 389                                   const struct dp_upcall_info *upcall_info)
 390 {
 391         struct ovs_header *upcall;
 392         struct sk_buff *nskb = NULL;
 393         struct sk_buff *user_skb; /* to be queued to userspace */
 394         struct nlattr *nla;
 395         struct genl_info info = {
 396                 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
 397                 .snd_portid = upcall_info->portid,
 398         };
 399         size_t len;
 400         unsigned int hlen;
 401         int err, dp_ifindex;
 402
 403         dp_ifindex = get_dpifindex(dp);
 404         if (!dp_ifindex)
 405                 return -ENODEV;
 406
 407         if (vlan_tx_tag_present(skb)) {
 408                 nskb = skb_clone(skb, GFP_ATOMIC);
 409                 if (!nskb)
 410                         return -ENOMEM;
 411
 412                 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb));
 413                 if (!nskb)
 414                         return -ENOMEM;
 415
 416                 nskb->vlan_tci = 0;
 417                 skb = nskb;
 418         }
 419
 420         if (nla_attr_size(skb->len) > USHRT_MAX) {
 421                 err = -EFBIG;
 422                 goto out;
 423         }
 424
 425         /* Complete checksum if needed */
 426         if (skb->ip_summed == CHECKSUM_PARTIAL &&
 427             (err = skb_checksum_help(skb)))
 428                 goto out;
 429
 430         /* Older versions of OVS user space enforce alignment of the last
 431          * Netlink attribute to NLA_ALIGNTO which would require extensive
 432          * padding logic. Only perform zerocopy if padding is not required.
 433          */
 434         if (dp->user_features & OVS_DP_F_UNALIGNED)
 435                 hlen = skb_zerocopy_headlen(skb);
 436         else
 437                 hlen = skb->len;
 438
 439         len = upcall_msg_size(upcall_info->userdata, hlen);
 440         user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
 441         if (!user_skb) {
 442                 err = -ENOMEM;
 443                 goto out;
 444         }
 445
 446         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
 447                              0, upcall_info->cmd);
 448         upcall->dp_ifindex = dp_ifindex;
 449
 450         nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
 451         ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb);
 452         nla_nest_end(user_skb, nla);
 453
 454         if (upcall_info->userdata)
 455                 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
 456                           nla_len(upcall_info->userdata),
 457                           nla_data(upcall_info->userdata));
 458
 459         /* Only reserve room for attribute header, packet data is added
 460          * in skb_zerocopy() */
 461         if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
 462                 err = -ENOBUFS;
 463                 goto out;
 464         }
 465         nla->nla_len = nla_attr_size(skb->len);
 466
 467         skb_zerocopy(user_skb, skb, skb->len, hlen);
 468
 469         ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
 470
 471         err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
 472 out:
 473         kfree_skb(nskb);
 474         return err;
 475 }
 476
 477 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 478 {
 479         struct ovs_header *ovs_header = info->userhdr;
 480         struct nlattr **a = info->attrs;
 481         struct sw_flow_actions *acts;
 482         struct sk_buff *packet;
 483         struct sw_flow *flow;
 484         struct datapath *dp;
 485         struct ethhdr *eth;
 486         int len;
 487         int err;
 488
 489         err = -EINVAL;
 490         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 491             !a[OVS_PACKET_ATTR_ACTIONS])
 492                 goto err;
 493
 494         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 495         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 496         err = -ENOMEM;
 497         if (!packet)
 498                 goto err;
 499         skb_reserve(packet, NET_IP_ALIGN);
 500
 501         nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
 502
 503         skb_reset_mac_header(packet);
 504         eth = eth_hdr(packet);
 505
 506         /* Normally, setting the skb 'protocol' field would be handled by a
 507          * call to eth_type_trans(), but it assumes there's a sending
 508          * device, which we may not have. */
 509         if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
 510                 packet->protocol = eth->h_proto;
 511         else
 512                 packet->protocol = htons(ETH_P_802_2);
 513
 514         /* Build an sw_flow for sending this packet. */
 515         flow = ovs_flow_alloc(false);
 516         err = PTR_ERR(flow);
 517         if (IS_ERR(flow))
 518                 goto err_kfree_skb;
 519
 520         err = ovs_flow_extract(packet, -1, &flow->key);
 521         if (err)
 522                 goto err_flow_free;
 523
 524         err = ovs_nla_get_flow_metadata(flow, a[OVS_PACKET_ATTR_KEY]);
 525         if (err)
 526                 goto err_flow_free;
 527         acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
 528         err = PTR_ERR(acts);
 529         if (IS_ERR(acts))
 530                 goto err_flow_free;
 531
 532         err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
 533                                    &flow->key, 0, &acts);
 534         rcu_assign_pointer(flow->sf_acts, acts);
 535         if (err)
 536                 goto err_flow_free;
 537
 538         OVS_CB(packet)->flow = flow;
 539         OVS_CB(packet)->pkt_key = &flow->key;
 540         packet->priority = flow->key.phy.priority;
 541         packet->mark = flow->key.phy.skb_mark;
 542
 543         rcu_read_lock();
 544         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 545         err = -ENODEV;
 546         if (!dp)
 547                 goto err_unlock;
 548
 549         local_bh_disable();
 550         err = ovs_execute_actions(dp, packet);
 551         local_bh_enable();
 552         rcu_read_unlock();
 553
 554         ovs_flow_free(flow, false);
 555         return err;
 556
 557 err_unlock:
 558         rcu_read_unlock();
 559 err_flow_free:
 560         ovs_flow_free(flow, false);
 561 err_kfree_skb:
 562         kfree_skb(packet);
 563 err:
 564         return err;
 565 }
 566
 567 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 568         [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
 569         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 570         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 571 };
 572
 573 static const struct genl_ops dp_packet_genl_ops[] = {
 574         { .cmd = OVS_PACKET_CMD_EXECUTE,
 575           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 576           .policy = packet_policy,
 577           .doit = ovs_packet_cmd_execute
 578         }
 579 };
 580
 581 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats,
 582                          struct ovs_dp_megaflow_stats *mega_stats)
 583 {
 584         int i;
 585
 586         memset(mega_stats, 0, sizeof(*mega_stats));
 587
 588         stats->n_flows = ovs_flow_tbl_count(&dp->table);
 589         mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
 590
 591         stats->n_hit = stats->n_missed = stats->n_lost = 0;
 592
 593         for_each_possible_cpu(i) {
 594                 const struct dp_stats_percpu *percpu_stats;
 595                 struct dp_stats_percpu local_stats;
 596                 unsigned int start;
 597
 598                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 599
 600                 do {
 601                         start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
 602                         local_stats = *percpu_stats;
 603                 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
 604
 605                 stats->n_hit += local_stats.n_hit;
 606                 stats->n_missed += local_stats.n_missed;
 607                 stats->n_lost += local_stats.n_lost;
 608                 mega_stats->n_mask_hit += local_stats.n_mask_hit;
 609         }
 610 }
 611
 612 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
 613         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
 614         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
 615         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
 616 };
 617
 618 static struct genl_family dp_flow_genl_family = {
 619         .id = GENL_ID_GENERATE,
 620         .hdrsize = sizeof(struct ovs_header),
 621         .name = OVS_FLOW_FAMILY,
 622         .version = OVS_FLOW_VERSION,
 623         .maxattr = OVS_FLOW_ATTR_MAX,
 624         .netnsok = true,
 625         .parallel_ops = true,
 626 };
 627
 628 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
 629         .name = OVS_FLOW_MCGROUP
 630 };
 631
 632 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
 633 {
 634         return NLMSG_ALIGN(sizeof(struct ovs_header))
 635                 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
 636                 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
 637                 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
 638                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
 639                 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
 640                 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
 641 }
 642
 643 /* Called with ovs_mutex. */
 644 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
 645                                   struct sk_buff *skb, u32 portid,
 646                                   u32 seq, u32 flags, u8 cmd)
 647 {
 648         const int skb_orig_len = skb->len;
 649         struct nlattr *start;
 650         struct ovs_flow_stats stats;
 651         __be16 tcp_flags;
 652         unsigned long used;
 653         struct ovs_header *ovs_header;
 654         struct nlattr *nla;
 655         int err;
 656
 657         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
 658         if (!ovs_header)
 659                 return -EMSGSIZE;
 660
 661         ovs_header->dp_ifindex = get_dpifindex(dp);
 662
 663         /* Fill flow key. */
 664         nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
 665         if (!nla)
 666                 goto nla_put_failure;
 667
 668         err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb);
 669         if (err)
 670                 goto error;
 671         nla_nest_end(skb, nla);
 672
 673         nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
 674         if (!nla)
 675                 goto nla_put_failure;
 676
 677         err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb);
 678         if (err)
 679                 goto error;
 680
 681         nla_nest_end(skb, nla);
 682
 683         ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
 684         if (used &&
 685             nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
 686                 goto nla_put_failure;
 687
 688         if (stats.n_packets &&
 689             nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
 690                 goto nla_put_failure;
 691
 692         if ((u8)ntohs(tcp_flags) &&
 693              nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
 694                 goto nla_put_failure;
 695
 696         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 697          * this is the first flow to be dumped into 'skb'.  This is unusual for
 698          * Netlink but individual action lists can be longer than
 699          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 700          * The userspace caller can always fetch the actions separately if it
 701          * really wants them.  (Most userspace callers in fact don't care.)
 702          *
 703          * This can only fail for dump operations because the skb is always
 704          * properly sized for single flows.
 705          */
 706         start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
 707         if (start) {
 708                 const struct sw_flow_actions *sf_acts;
 709
 710                 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
 711
 712                 err = ovs_nla_put_actions(sf_acts->actions,
 713                                           sf_acts->actions_len, skb);
 714                 if (!err)
 715                         nla_nest_end(skb, start);
 716                 else {
 717                         if (skb_orig_len)
 718                                 goto error;
 719
 720                         nla_nest_cancel(skb, start);
 721                 }
 722         } else if (skb_orig_len)
 723                 goto nla_put_failure;
 724
 725         return genlmsg_end(skb, ovs_header);
 726
 727 nla_put_failure:
 728         err = -EMSGSIZE;
 729 error:
 730         genlmsg_cancel(skb, ovs_header);
 731         return err;
 732 }
 733
 734 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow,
 735                                                struct genl_info *info)
 736 {
 737         size_t len;
 738
 739         len = ovs_flow_cmd_msg_size(ovsl_dereference(flow->sf_acts));
 740
 741         return genlmsg_new_unicast(len, info, GFP_KERNEL);
 742 }
 743
 744 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
 745                                                struct datapath *dp,
 746                                                struct genl_info *info,
 747                                                u8 cmd)
 748 {
 749         struct sk_buff *skb;
 750         int retval;
 751
 752         skb = ovs_flow_cmd_alloc_info(flow, info);
 753         if (!skb)
 754                 return ERR_PTR(-ENOMEM);
 755
 756         retval = ovs_flow_cmd_fill_info(flow, dp, skb, info->snd_portid,
 757                                         info->snd_seq, 0, cmd);
 758         BUG_ON(retval < 0);
 759         return skb;
 760 }
 761
 762 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
 763 {
 764         struct nlattr **a = info->attrs;
 765         struct ovs_header *ovs_header = info->userhdr;
 766         struct sw_flow_key key, masked_key;
 767         struct sw_flow *flow = NULL;
 768         struct sw_flow_mask mask;
 769         struct sk_buff *reply;
 770         struct datapath *dp;
 771         struct sw_flow_actions *acts = NULL;
 772         struct sw_flow_match match;
 773         bool exact_5tuple;
 774         int error;
 775
 776         /* Extract key. */
 777         error = -EINVAL;
 778         if (!a[OVS_FLOW_ATTR_KEY])
 779                 goto error;
 780
 781         ovs_match_init(&match, &key, &mask);
 782         error = ovs_nla_get_match(&match, &exact_5tuple,
 783                                   a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
 784         if (error)
 785                 goto error;
 786
 787         /* Validate actions. */
 788         if (a[OVS_FLOW_ATTR_ACTIONS]) {
 789                 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
 790                 error = PTR_ERR(acts);
 791                 if (IS_ERR(acts))
 792                         goto error;
 793
 794                 ovs_flow_mask_key(&masked_key, &key, &mask);
 795                 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS],
 796                                              &masked_key, 0, &acts);
 797                 if (error) {
 798                         OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
 799                         goto err_kfree;
 800                 }
 801         } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
 802                 error = -EINVAL;
 803                 goto error;
 804         }
 805
 806         ovs_lock();
 807         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 808         error = -ENODEV;
 809         if (!dp)
 810                 goto err_unlock_ovs;
 811
 812         /* Check if this is a duplicate flow */
 813         flow = ovs_flow_tbl_lookup(&dp->table, &key);
 814         if (!flow) {
 815                 /* Bail out if we're not allowed to create a new flow. */
 816                 error = -ENOENT;
 817                 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
 818                         goto err_unlock_ovs;
 819
 820                 /* Allocate flow. */
 821                 flow = ovs_flow_alloc(!exact_5tuple);
 822                 if (IS_ERR(flow)) {
 823                         error = PTR_ERR(flow);
 824                         goto err_unlock_ovs;
 825                 }
 826
 827                 flow->key = masked_key;
 828                 flow->unmasked_key = key;
 829                 rcu_assign_pointer(flow->sf_acts, acts);
 830
 831                 /* Put flow in bucket. */
 832                 error = ovs_flow_tbl_insert(&dp->table, flow, &mask);
 833                 if (error) {
 834                         acts = NULL;
 835                         goto err_flow_free;
 836                 }
 837
 838                 reply = ovs_flow_cmd_build_info(flow, dp, info, OVS_FLOW_CMD_NEW);
 839         } else {
 840                 /* We found a matching flow. */
 841                 struct sw_flow_actions *old_acts;
 842
 843                 /* Bail out if we're not allowed to modify an existing flow.
 844                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
 845                  * because Generic Netlink treats the latter as a dump
 846                  * request.  We also accept NLM_F_EXCL in case that bug ever
 847                  * gets fixed.
 848                  */
 849                 error = -EEXIST;
 850                 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
 851                     info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
 852                         goto err_unlock_ovs;
 853
 854                 /* The unmasked key has to be the same for flow updates. */
 855                 error = -EINVAL;
 856                 if (!ovs_flow_cmp_unmasked_key(flow, &match)) {
 857                         OVS_NLERR("Flow modification message rejected, unmasked key does not match.\n");
 858                         goto err_unlock_ovs;
 859                 }
 860
 861                 /* Update actions. */
 862                 old_acts = ovsl_dereference(flow->sf_acts);
 863                 rcu_assign_pointer(flow->sf_acts, acts);
 864                 ovs_nla_free_flow_actions(old_acts);
 865
 866                 reply = ovs_flow_cmd_build_info(flow, dp, info, OVS_FLOW_CMD_NEW);
 867
 868                 /* Clear stats. */
 869                 if (a[OVS_FLOW_ATTR_CLEAR])
 870                         ovs_flow_stats_clear(flow);
 871         }
 872         ovs_unlock();
 873
 874         if (!IS_ERR(reply))
 875                 ovs_notify(&dp_flow_genl_family, reply, info);
 876         else
 877                 genl_set_err(&dp_flow_genl_family, sock_net(skb->sk), 0,
 878                              0, PTR_ERR(reply));
 879         return 0;
 880
 881 err_flow_free:
 882         ovs_flow_free(flow, false);
 883 err_unlock_ovs:
 884         ovs_unlock();
 885 err_kfree:
 886         kfree(acts);
 887 error:
 888         return error;
 889 }
 890
 891 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
 892 {
 893         struct nlattr **a = info->attrs;
 894         struct ovs_header *ovs_header = info->userhdr;
 895         struct sw_flow_key key;
 896         struct sk_buff *reply;
 897         struct sw_flow *flow;
 898         struct datapath *dp;
 899         struct sw_flow_match match;
 900         int err;
 901
 902         if (!a[OVS_FLOW_ATTR_KEY]) {
 903                 OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
 904                 return -EINVAL;
 905         }
 906
 907         ovs_match_init(&match, &key, NULL);
 908         err = ovs_nla_get_match(&match, NULL, a[OVS_FLOW_ATTR_KEY], NULL);
 909         if (err)
 910                 return err;
 911
 912         ovs_lock();
 913         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 914         if (!dp) {
 915                 err = -ENODEV;
 916                 goto unlock;
 917         }
 918
 919         flow = ovs_flow_tbl_lookup(&dp->table, &key);
 920         if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) {
 921                 err = -ENOENT;
 922                 goto unlock;
 923         }
 924
 925         reply = ovs_flow_cmd_build_info(flow, dp, info, OVS_FLOW_CMD_NEW);
 926         if (IS_ERR(reply)) {
 927                 err = PTR_ERR(reply);
 928                 goto unlock;
 929         }
 930
 931         ovs_unlock();
 932         return genlmsg_reply(reply, info);
 933 unlock:
 934         ovs_unlock();
 935         return err;
 936 }
 937
 938 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
 939 {
 940         struct nlattr **a = info->attrs;
 941         struct ovs_header *ovs_header = info->userhdr;
 942         struct sw_flow_key key;
 943         struct sk_buff *reply;
 944         struct sw_flow *flow;
 945         struct datapath *dp;
 946         struct sw_flow_match match;
 947         int err;
 948
 949         ovs_lock();
 950         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 951         if (!dp) {
 952                 err = -ENODEV;
 953                 goto unlock;
 954         }
 955
 956         if (!a[OVS_FLOW_ATTR_KEY]) {
 957                 err = ovs_flow_tbl_flush(&dp->table);
 958                 goto unlock;
 959         }
 960
 961         ovs_match_init(&match, &key, NULL);
 962         err = ovs_nla_get_match(&match, NULL, a[OVS_FLOW_ATTR_KEY], NULL);
 963         if (err)
 964                 goto unlock;
 965
 966         flow = ovs_flow_tbl_lookup(&dp->table, &key);
 967         if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) {
 968                 err = -ENOENT;
 969                 goto unlock;
 970         }
 971
 972         reply = ovs_flow_cmd_alloc_info(flow, info);
 973         if (!reply) {
 974                 err = -ENOMEM;
 975                 goto unlock;
 976         }
 977
 978         ovs_flow_tbl_remove(&dp->table, flow);
 979
 980         err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
 981                                      info->snd_seq, 0, OVS_FLOW_CMD_DEL);
 982         BUG_ON(err < 0);
 983
 984         ovs_flow_free(flow, true);
 985         ovs_unlock();
 986
 987         ovs_notify(&dp_flow_genl_family, reply, info);
 988         return 0;
 989 unlock:
 990         ovs_unlock();
 991         return err;
 992 }
 993
 994 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
 995 {
 996         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
 997         struct table_instance *ti;
 998         struct datapath *dp;
 999
1000         rcu_read_lock();
1001         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1002         if (!dp) {
1003                 rcu_read_unlock();
1004                 return -ENODEV;
1005         }
1006
1007         ti = rcu_dereference(dp->table.ti);
1008         for (;;) {
1009                 struct sw_flow *flow;
1010                 u32 bucket, obj;
1011
1012                 bucket = cb->args[0];
1013                 obj = cb->args[1];
1014                 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1015                 if (!flow)
1016                         break;
1017
1018                 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1019                                            NETLINK_CB(cb->skb).portid,
1020                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1021                                            OVS_FLOW_CMD_NEW) < 0)
1022                         break;
1023
1024                 cb->args[0] = bucket;
1025                 cb->args[1] = obj;
1026         }
1027         rcu_read_unlock();
1028         return skb->len;
1029 }
1030
1031 static const struct genl_ops dp_flow_genl_ops[] = {
1032         { .cmd = OVS_FLOW_CMD_NEW,
1033           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1034           .policy = flow_policy,
1035           .doit = ovs_flow_cmd_new_or_set
1036         },
1037         { .cmd = OVS_FLOW_CMD_DEL,
1038           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1039           .policy = flow_policy,
1040           .doit = ovs_flow_cmd_del
1041         },
1042         { .cmd = OVS_FLOW_CMD_GET,
1043           .flags = 0,               /* OK for unprivileged users. */
1044           .policy = flow_policy,
1045           .doit = ovs_flow_cmd_get,
1046           .dumpit = ovs_flow_cmd_dump
1047         },
1048         { .cmd = OVS_FLOW_CMD_SET,
1049           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1050           .policy = flow_policy,
1051           .doit = ovs_flow_cmd_new_or_set,
1052         },
1053 };
1054
1055 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1056         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1057         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1058         [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1059 };
1060
1061 static struct genl_family dp_datapath_genl_family = {
1062         .id = GENL_ID_GENERATE,
1063         .hdrsize = sizeof(struct ovs_header),
1064         .name = OVS_DATAPATH_FAMILY,
1065         .version = OVS_DATAPATH_VERSION,
1066         .maxattr = OVS_DP_ATTR_MAX,
1067         .netnsok = true,
1068         .parallel_ops = true,
1069 };
1070
1071 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1072         .name = OVS_DATAPATH_MCGROUP
1073 };
1074
1075 static size_t ovs_dp_cmd_msg_size(void)
1076 {
1077         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1078
1079         msgsize += nla_total_size(IFNAMSIZ);
1080         msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1081         msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1082
1083         return msgsize;
1084 }
1085
1086 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1087                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1088 {
1089         struct ovs_header *ovs_header;
1090         struct ovs_dp_stats dp_stats;
1091         struct ovs_dp_megaflow_stats dp_megaflow_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, &dp_megaflow_stats);
1108         if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1109                         &dp_stats))
1110                 goto nla_put_failure;
1111
1112         if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1113                         sizeof(struct ovs_dp_megaflow_stats),
1114                         &dp_megaflow_stats))
1115                 goto nla_put_failure;
1116
1117         if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1118                 goto nla_put_failure;
1119
1120         return genlmsg_end(skb, ovs_header);
1121
1122 nla_put_failure:
1123         genlmsg_cancel(skb, ovs_header);
1124 error:
1125         return -EMSGSIZE;
1126 }
1127
1128 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp,
1129                                              struct genl_info *info, u8 cmd)
1130 {
1131         struct sk_buff *skb;
1132         int retval;
1133
1134         skb = genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1135         if (!skb)
1136                 return ERR_PTR(-ENOMEM);
1137
1138         retval = ovs_dp_cmd_fill_info(dp, skb, info->snd_portid, info->snd_seq, 0, cmd);
1139         if (retval < 0) {
1140                 kfree_skb(skb);
1141                 return ERR_PTR(retval);
1142         }
1143         return skb;
1144 }
1145
1146 /* Called with ovs_mutex. */
1147 static struct datapath *lookup_datapath(struct net *net,
1148                                         struct ovs_header *ovs_header,
1149                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1150 {
1151         struct datapath *dp;
1152
1153         if (!a[OVS_DP_ATTR_NAME])
1154                 dp = get_dp(net, ovs_header->dp_ifindex);
1155         else {
1156                 struct vport *vport;
1157
1158                 rcu_read_lock();
1159                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1160                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1161                 rcu_read_unlock();
1162         }
1163         return dp ? dp : ERR_PTR(-ENODEV);
1164 }
1165
1166 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1167 {
1168         struct datapath *dp;
1169
1170         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1171         if (!dp)
1172                 return;
1173
1174         WARN(dp->user_features, "Dropping previously announced user features\n");
1175         dp->user_features = 0;
1176 }
1177
1178 static void ovs_dp_change(struct datapath *dp, struct nlattr **a)
1179 {
1180         if (a[OVS_DP_ATTR_USER_FEATURES])
1181                 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1182 }
1183
1184 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1185 {
1186         struct nlattr **a = info->attrs;
1187         struct vport_parms parms;
1188         struct sk_buff *reply;
1189         struct datapath *dp;
1190         struct vport *vport;
1191         struct ovs_net *ovs_net;
1192         int err, i;
1193
1194         err = -EINVAL;
1195         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1196                 goto err;
1197
1198         ovs_lock();
1199
1200         err = -ENOMEM;
1201         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1202         if (dp == NULL)
1203                 goto err_unlock_ovs;
1204
1205         ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1206
1207         /* Allocate table. */
1208         err = ovs_flow_tbl_init(&dp->table);
1209         if (err)
1210                 goto err_free_dp;
1211
1212         dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1213         if (!dp->stats_percpu) {
1214                 err = -ENOMEM;
1215                 goto err_destroy_table;
1216         }
1217
1218         for_each_possible_cpu(i) {
1219                 struct dp_stats_percpu *dpath_stats;
1220                 dpath_stats = per_cpu_ptr(dp->stats_percpu, i);
1221                 u64_stats_init(&dpath_stats->sync);
1222         }
1223
1224         dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1225                             GFP_KERNEL);
1226         if (!dp->ports) {
1227                 err = -ENOMEM;
1228                 goto err_destroy_percpu;
1229         }
1230
1231         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1232                 INIT_HLIST_HEAD(&dp->ports[i]);
1233
1234         /* Set up our datapath device. */
1235         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1236         parms.type = OVS_VPORT_TYPE_INTERNAL;
1237         parms.options = NULL;
1238         parms.dp = dp;
1239         parms.port_no = OVSP_LOCAL;
1240         parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1241
1242         ovs_dp_change(dp, a);
1243
1244         vport = new_vport(&parms);
1245         if (IS_ERR(vport)) {
1246                 err = PTR_ERR(vport);
1247                 if (err == -EBUSY)
1248                         err = -EEXIST;
1249
1250                 if (err == -EEXIST) {
1251                         /* An outdated user space instance that does not understand
1252                          * the concept of user_features has attempted to create a new
1253                          * datapath and is likely to reuse it. Drop all user features.
1254                          */
1255                         if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1256                                 ovs_dp_reset_user_features(skb, info);
1257                 }
1258
1259                 goto err_destroy_ports_array;
1260         }
1261
1262         reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW);
1263         err = PTR_ERR(reply);
1264         if (IS_ERR(reply))
1265                 goto err_destroy_local_port;
1266
1267         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1268         list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1269
1270         ovs_unlock();
1271
1272         ovs_notify(&dp_datapath_genl_family, reply, info);
1273         return 0;
1274
1275 err_destroy_local_port:
1276         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1277 err_destroy_ports_array:
1278         kfree(dp->ports);
1279 err_destroy_percpu:
1280         free_percpu(dp->stats_percpu);
1281 err_destroy_table:
1282         ovs_flow_tbl_destroy(&dp->table);
1283 err_free_dp:
1284         release_net(ovs_dp_get_net(dp));
1285         kfree(dp);
1286 err_unlock_ovs:
1287         ovs_unlock();
1288 err:
1289         return err;
1290 }
1291
1292 /* Called with ovs_mutex. */
1293 static void __dp_destroy(struct datapath *dp)
1294 {
1295         int i;
1296
1297         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1298                 struct vport *vport;
1299                 struct hlist_node *n;
1300
1301                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1302                         if (vport->port_no != OVSP_LOCAL)
1303                                 ovs_dp_detach_port(vport);
1304         }
1305
1306         list_del_rcu(&dp->list_node);
1307
1308         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1309          * all port in datapath are destroyed first before freeing datapath.
1310          */
1311         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1312
1313         call_rcu(&dp->rcu, destroy_dp_rcu);
1314 }
1315
1316 static int ovs_dp_cmd_del(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, OVS_DP_CMD_DEL);
1329         err = PTR_ERR(reply);
1330         if (IS_ERR(reply))
1331                 goto unlock;
1332
1333         __dp_destroy(dp);
1334         ovs_unlock();
1335
1336         ovs_notify(&dp_datapath_genl_family, reply, info);
1337
1338         return 0;
1339 unlock:
1340         ovs_unlock();
1341         return err;
1342 }
1343
1344 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1345 {
1346         struct sk_buff *reply;
1347         struct datapath *dp;
1348         int err;
1349
1350         ovs_lock();
1351         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1352         err = PTR_ERR(dp);
1353         if (IS_ERR(dp))
1354                 goto unlock;
1355
1356         ovs_dp_change(dp, info->attrs);
1357
1358         reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW);
1359         if (IS_ERR(reply)) {
1360                 err = PTR_ERR(reply);
1361                 genl_set_err(&dp_datapath_genl_family, sock_net(skb->sk), 0,
1362                              0, err);
1363                 err = 0;
1364                 goto unlock;
1365         }
1366
1367         ovs_unlock();
1368         ovs_notify(&dp_datapath_genl_family, reply, info);
1369
1370         return 0;
1371 unlock:
1372         ovs_unlock();
1373         return err;
1374 }
1375
1376 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1377 {
1378         struct sk_buff *reply;
1379         struct datapath *dp;
1380         int err;
1381
1382         ovs_lock();
1383         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1384         if (IS_ERR(dp)) {
1385                 err = PTR_ERR(dp);
1386                 goto unlock;
1387         }
1388
1389         reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW);
1390         if (IS_ERR(reply)) {
1391                 err = PTR_ERR(reply);
1392                 goto unlock;
1393         }
1394
1395         ovs_unlock();
1396         return genlmsg_reply(reply, info);
1397
1398 unlock:
1399         ovs_unlock();
1400         return err;
1401 }
1402
1403 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1404 {
1405         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1406         struct datapath *dp;
1407         int skip = cb->args[0];
1408         int i = 0;
1409
1410         rcu_read_lock();
1411         list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1412                 if (i >= skip &&
1413                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1414                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1415                                          OVS_DP_CMD_NEW) < 0)
1416                         break;
1417                 i++;
1418         }
1419         rcu_read_unlock();
1420
1421         cb->args[0] = i;
1422
1423         return skb->len;
1424 }
1425
1426 static const struct genl_ops dp_datapath_genl_ops[] = {
1427         { .cmd = OVS_DP_CMD_NEW,
1428           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1429           .policy = datapath_policy,
1430           .doit = ovs_dp_cmd_new
1431         },
1432         { .cmd = OVS_DP_CMD_DEL,
1433           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1434           .policy = datapath_policy,
1435           .doit = ovs_dp_cmd_del
1436         },
1437         { .cmd = OVS_DP_CMD_GET,
1438           .flags = 0,               /* OK for unprivileged users. */
1439           .policy = datapath_policy,
1440           .doit = ovs_dp_cmd_get,
1441           .dumpit = ovs_dp_cmd_dump
1442         },
1443         { .cmd = OVS_DP_CMD_SET,
1444           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1445           .policy = datapath_policy,
1446           .doit = ovs_dp_cmd_set,
1447         },
1448 };
1449
1450 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1451         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1452         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1453         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1454         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1455         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1456         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1457 };
1458
1459 struct genl_family dp_vport_genl_family = {
1460         .id = GENL_ID_GENERATE,
1461         .hdrsize = sizeof(struct ovs_header),
1462         .name = OVS_VPORT_FAMILY,
1463         .version = OVS_VPORT_VERSION,
1464         .maxattr = OVS_VPORT_ATTR_MAX,
1465         .netnsok = true,
1466         .parallel_ops = true,
1467 };
1468
1469 static struct genl_multicast_group ovs_dp_vport_multicast_group = {
1470         .name = OVS_VPORT_MCGROUP
1471 };
1472
1473 /* Called with ovs_mutex or RCU read lock. */
1474 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1475                                    u32 portid, u32 seq, u32 flags, u8 cmd)
1476 {
1477         struct ovs_header *ovs_header;
1478         struct ovs_vport_stats vport_stats;
1479         int err;
1480
1481         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1482                                  flags, cmd);
1483         if (!ovs_header)
1484                 return -EMSGSIZE;
1485
1486         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1487
1488         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1489             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1490             nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1491             nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
1492                 goto nla_put_failure;
1493
1494         ovs_vport_get_stats(vport, &vport_stats);
1495         if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1496                     &vport_stats))
1497                 goto nla_put_failure;
1498
1499         err = ovs_vport_get_options(vport, skb);
1500         if (err == -EMSGSIZE)
1501                 goto error;
1502
1503         return genlmsg_end(skb, ovs_header);
1504
1505 nla_put_failure:
1506         err = -EMSGSIZE;
1507 error:
1508         genlmsg_cancel(skb, ovs_header);
1509         return err;
1510 }
1511
1512 /* Called with ovs_mutex or RCU read lock. */
1513 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1514                                          u32 seq, u8 cmd)
1515 {
1516         struct sk_buff *skb;
1517         int retval;
1518
1519         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1520         if (!skb)
1521                 return ERR_PTR(-ENOMEM);
1522
1523         retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1524         BUG_ON(retval < 0);
1525
1526         return skb;
1527 }
1528
1529 /* Called with ovs_mutex or RCU read lock. */
1530 static struct vport *lookup_vport(struct net *net,
1531                                   struct ovs_header *ovs_header,
1532                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1533 {
1534         struct datapath *dp;
1535         struct vport *vport;
1536
1537         if (a[OVS_VPORT_ATTR_NAME]) {
1538                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1539                 if (!vport)
1540                         return ERR_PTR(-ENODEV);
1541                 if (ovs_header->dp_ifindex &&
1542                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1543                         return ERR_PTR(-ENODEV);
1544                 return vport;
1545         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1546                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1547
1548                 if (port_no >= DP_MAX_PORTS)
1549                         return ERR_PTR(-EFBIG);
1550
1551                 dp = get_dp(net, ovs_header->dp_ifindex);
1552                 if (!dp)
1553                         return ERR_PTR(-ENODEV);
1554
1555                 vport = ovs_vport_ovsl_rcu(dp, port_no);
1556                 if (!vport)
1557                         return ERR_PTR(-ENODEV);
1558                 return vport;
1559         } else
1560                 return ERR_PTR(-EINVAL);
1561 }
1562
1563 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1564 {
1565         struct nlattr **a = info->attrs;
1566         struct ovs_header *ovs_header = info->userhdr;
1567         struct vport_parms parms;
1568         struct sk_buff *reply;
1569         struct vport *vport;
1570         struct datapath *dp;
1571         u32 port_no;
1572         int err;
1573
1574         err = -EINVAL;
1575         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1576             !a[OVS_VPORT_ATTR_UPCALL_PID])
1577                 goto exit;
1578
1579         ovs_lock();
1580         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1581         err = -ENODEV;
1582         if (!dp)
1583                 goto exit_unlock;
1584
1585         if (a[OVS_VPORT_ATTR_PORT_NO]) {
1586                 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1587
1588                 err = -EFBIG;
1589                 if (port_no >= DP_MAX_PORTS)
1590                         goto exit_unlock;
1591
1592                 vport = ovs_vport_ovsl(dp, port_no);
1593                 err = -EBUSY;
1594                 if (vport)
1595                         goto exit_unlock;
1596         } else {
1597                 for (port_no = 1; ; port_no++) {
1598                         if (port_no >= DP_MAX_PORTS) {
1599                                 err = -EFBIG;
1600                                 goto exit_unlock;
1601                         }
1602                         vport = ovs_vport_ovsl(dp, port_no);
1603                         if (!vport)
1604                                 break;
1605                 }
1606         }
1607
1608         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1609         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1610         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1611         parms.dp = dp;
1612         parms.port_no = port_no;
1613         parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1614
1615         vport = new_vport(&parms);
1616         err = PTR_ERR(vport);
1617         if (IS_ERR(vport))
1618                 goto exit_unlock;
1619
1620         err = 0;
1621         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1622                                          OVS_VPORT_CMD_NEW);
1623         if (IS_ERR(reply)) {
1624                 err = PTR_ERR(reply);
1625                 ovs_dp_detach_port(vport);
1626                 goto exit_unlock;
1627         }
1628
1629         ovs_notify(&dp_vport_genl_family, reply, info);
1630
1631 exit_unlock:
1632         ovs_unlock();
1633 exit:
1634         return err;
1635 }
1636
1637 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1638 {
1639         struct nlattr **a = info->attrs;
1640         struct sk_buff *reply;
1641         struct vport *vport;
1642         int err;
1643
1644         ovs_lock();
1645         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1646         err = PTR_ERR(vport);
1647         if (IS_ERR(vport))
1648                 goto exit_unlock;
1649
1650         if (a[OVS_VPORT_ATTR_TYPE] &&
1651             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1652                 err = -EINVAL;
1653                 goto exit_unlock;
1654         }
1655
1656         reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1657         if (!reply) {
1658                 err = -ENOMEM;
1659                 goto exit_unlock;
1660         }
1661
1662         if (a[OVS_VPORT_ATTR_OPTIONS]) {
1663                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1664                 if (err)
1665                         goto exit_free;
1666         }
1667
1668         if (a[OVS_VPORT_ATTR_UPCALL_PID])
1669                 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1670
1671         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1672                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1673         BUG_ON(err < 0);
1674
1675         ovs_unlock();
1676         ovs_notify(&dp_vport_genl_family, reply, info);
1677         return 0;
1678
1679 exit_free:
1680         kfree_skb(reply);
1681 exit_unlock:
1682         ovs_unlock();
1683         return err;
1684 }
1685
1686 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1687 {
1688         struct nlattr **a = info->attrs;
1689         struct sk_buff *reply;
1690         struct vport *vport;
1691         int err;
1692
1693         ovs_lock();
1694         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1695         err = PTR_ERR(vport);
1696         if (IS_ERR(vport))
1697                 goto exit_unlock;
1698
1699         if (vport->port_no == OVSP_LOCAL) {
1700                 err = -EINVAL;
1701                 goto exit_unlock;
1702         }
1703
1704         reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
1705                                          info->snd_seq, OVS_VPORT_CMD_DEL);
1706         err = PTR_ERR(reply);
1707         if (IS_ERR(reply))
1708                 goto exit_unlock;
1709
1710         err = 0;
1711         ovs_dp_detach_port(vport);
1712
1713         ovs_notify(&dp_vport_genl_family, reply, info);
1714
1715 exit_unlock:
1716         ovs_unlock();
1717         return err;
1718 }
1719
1720 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1721 {
1722         struct nlattr **a = info->attrs;
1723         struct ovs_header *ovs_header = info->userhdr;
1724         struct sk_buff *reply;
1725         struct vport *vport;
1726         int err;
1727
1728         rcu_read_lock();
1729         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1730         err = PTR_ERR(vport);
1731         if (IS_ERR(vport))
1732                 goto exit_unlock;
1733
1734         reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
1735                                          info->snd_seq, OVS_VPORT_CMD_NEW);
1736         err = PTR_ERR(reply);
1737         if (IS_ERR(reply))
1738                 goto exit_unlock;
1739
1740         rcu_read_unlock();
1741
1742         return genlmsg_reply(reply, info);
1743
1744 exit_unlock:
1745         rcu_read_unlock();
1746         return err;
1747 }
1748
1749 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1750 {
1751         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1752         struct datapath *dp;
1753         int bucket = cb->args[0], skip = cb->args[1];
1754         int i, j = 0;
1755
1756         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1757         if (!dp)
1758                 return -ENODEV;
1759
1760         rcu_read_lock();
1761         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1762                 struct vport *vport;
1763
1764                 j = 0;
1765                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1766                         if (j >= skip &&
1767                             ovs_vport_cmd_fill_info(vport, skb,
1768                                                     NETLINK_CB(cb->skb).portid,
1769                                                     cb->nlh->nlmsg_seq,
1770                                                     NLM_F_MULTI,
1771                                                     OVS_VPORT_CMD_NEW) < 0)
1772                                 goto out;
1773
1774                         j++;
1775                 }
1776                 skip = 0;
1777         }
1778 out:
1779         rcu_read_unlock();
1780
1781         cb->args[0] = i;
1782         cb->args[1] = j;
1783
1784         return skb->len;
1785 }
1786
1787 static const struct genl_ops dp_vport_genl_ops[] = {
1788         { .cmd = OVS_VPORT_CMD_NEW,
1789           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1790           .policy = vport_policy,
1791           .doit = ovs_vport_cmd_new
1792         },
1793         { .cmd = OVS_VPORT_CMD_DEL,
1794           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1795           .policy = vport_policy,
1796           .doit = ovs_vport_cmd_del
1797         },
1798         { .cmd = OVS_VPORT_CMD_GET,
1799           .flags = 0,               /* OK for unprivileged users. */
1800           .policy = vport_policy,
1801           .doit = ovs_vport_cmd_get,
1802           .dumpit = ovs_vport_cmd_dump
1803         },
1804         { .cmd = OVS_VPORT_CMD_SET,
1805           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1806           .policy = vport_policy,
1807           .doit = ovs_vport_cmd_set,
1808         },
1809 };
1810
1811 struct genl_family_and_ops {
1812         struct genl_family *family;
1813         const struct genl_ops *ops;
1814         int n_ops;
1815         const struct genl_multicast_group *group;
1816 };
1817
1818 static const struct genl_family_and_ops dp_genl_families[] = {
1819         { &dp_datapath_genl_family,
1820           dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1821           &ovs_dp_datapath_multicast_group },
1822         { &dp_vport_genl_family,
1823           dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1824           &ovs_dp_vport_multicast_group },
1825         { &dp_flow_genl_family,
1826           dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1827           &ovs_dp_flow_multicast_group },
1828         { &dp_packet_genl_family,
1829           dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1830           NULL },
1831 };
1832
1833 static void dp_unregister_genl(int n_families)
1834 {
1835         int i;
1836
1837         for (i = 0; i < n_families; i++)
1838                 genl_unregister_family(dp_genl_families[i].family);
1839 }
1840
1841 static int dp_register_genl(void)
1842 {
1843         int n_registered;
1844         int err;
1845         int i;
1846
1847         n_registered = 0;
1848         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1849                 const struct genl_family_and_ops *f = &dp_genl_families[i];
1850
1851                 f->family->ops = f->ops;
1852                 f->family->n_ops = f->n_ops;
1853                 f->family->mcgrps = f->group;
1854                 f->family->n_mcgrps = f->group ? 1 : 0;
1855                 err = genl_register_family(f->family);
1856                 if (err)
1857                         goto error;
1858                 n_registered++;
1859         }
1860
1861         return 0;
1862
1863 error:
1864         dp_unregister_genl(n_registered);
1865         return err;
1866 }
1867
1868 static int __net_init ovs_init_net(struct net *net)
1869 {
1870         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1871
1872         INIT_LIST_HEAD(&ovs_net->dps);
1873         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
1874         return 0;
1875 }
1876
1877 static void __net_exit ovs_exit_net(struct net *net)
1878 {
1879         struct datapath *dp, *dp_next;
1880         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1881
1882         ovs_lock();
1883         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
1884                 __dp_destroy(dp);
1885         ovs_unlock();
1886
1887         cancel_work_sync(&ovs_net->dp_notify_work);
1888 }
1889
1890 static struct pernet_operations ovs_net_ops = {
1891         .init = ovs_init_net,
1892         .exit = ovs_exit_net,
1893         .id   = &ovs_net_id,
1894         .size = sizeof(struct ovs_net),
1895 };
1896
1897 static int __init dp_init(void)
1898 {
1899         int err;
1900
1901         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
1902
1903         pr_info("Open vSwitch switching datapath\n");
1904
1905         err = ovs_flow_init();
1906         if (err)
1907                 goto error;
1908
1909         err = ovs_vport_init();
1910         if (err)
1911                 goto error_flow_exit;
1912
1913         err = register_pernet_device(&ovs_net_ops);
1914         if (err)
1915                 goto error_vport_exit;
1916
1917         err = register_netdevice_notifier(&ovs_dp_device_notifier);
1918         if (err)
1919                 goto error_netns_exit;
1920
1921         err = dp_register_genl();
1922         if (err < 0)
1923                 goto error_unreg_notifier;
1924
1925         return 0;
1926
1927 error_unreg_notifier:
1928         unregister_netdevice_notifier(&ovs_dp_device_notifier);
1929 error_netns_exit:
1930         unregister_pernet_device(&ovs_net_ops);
1931 error_vport_exit:
1932         ovs_vport_exit();
1933 error_flow_exit:
1934         ovs_flow_exit();
1935 error:
1936         return err;
1937 }
1938
1939 static void dp_cleanup(void)
1940 {
1941         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
1942         unregister_netdevice_notifier(&ovs_dp_device_notifier);
1943         unregister_pernet_device(&ovs_net_ops);
1944         rcu_barrier();
1945         ovs_vport_exit();
1946         ovs_flow_exit();
1947 }
1948
1949 module_init(dp_init);
1950 module_exit(dp_cleanup);
1951
1952 MODULE_DESCRIPTION("Open vSwitch switching datapath");
1953 MODULE_LICENSE("GPL");