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_table.h"
  59 #include "flow_netlink.h"
  60 #include "vport-internal_dev.h"
  61 #include "vport-netdev.h"
  62
  63 int ovs_net_id __read_mostly;
  64
  65 static void ovs_notify(struct genl_family *family,
  66                        struct sk_buff *skb, struct genl_info *info)
  67 {
  68         genl_notify(family, skb, genl_info_net(info), info->snd_portid,
  69                     0, info->nlhdr, GFP_KERNEL);
  70 }
  71
  72 /**
  73  * DOC: Locking:
  74  *
  75  * All writes e.g. Writes to device state (add/remove datapath, port, set
  76  * operations on vports, etc.), Writes to other state (flow table
  77  * modifications, set miscellaneous datapath parameters, etc.) are protected
  78  * by ovs_lock.
  79  *
  80  * Reads are protected by RCU.
  81  *
  82  * There are a few special cases (mostly stats) that have their own
  83  * synchronization but they nest under all of above and don't interact with
  84  * each other.
  85  *
  86  * The RTNL lock nests inside ovs_mutex.
  87  */
  88
  89 static DEFINE_MUTEX(ovs_mutex);
  90
  91 void ovs_lock(void)
  92 {
  93         mutex_lock(&ovs_mutex);
  94 }
  95
  96 void ovs_unlock(void)
  97 {
  98         mutex_unlock(&ovs_mutex);
  99 }
 100
 101 #ifdef CONFIG_LOCKDEP
 102 int lockdep_ovsl_is_held(void)
 103 {
 104         if (debug_locks)
 105                 return lockdep_is_held(&ovs_mutex);
 106         else
 107                 return 1;
 108 }
 109 #endif
 110
 111 static struct vport *new_vport(const struct vport_parms *);
 112 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
 113                              const struct dp_upcall_info *);
 114 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
 115                                   const struct dp_upcall_info *);
 116
 117 /* Must be called with rcu_read_lock or ovs_mutex. */
 118 static struct datapath *get_dp(struct net *net, int dp_ifindex)
 119 {
 120         struct datapath *dp = NULL;
 121         struct net_device *dev;
 122
 123         rcu_read_lock();
 124         dev = dev_get_by_index_rcu(net, dp_ifindex);
 125         if (dev) {
 126                 struct vport *vport = ovs_internal_dev_get_vport(dev);
 127                 if (vport)
 128                         dp = vport->dp;
 129         }
 130         rcu_read_unlock();
 131
 132         return dp;
 133 }
 134
 135 /* Must be called with rcu_read_lock or ovs_mutex. */
 136 static const char *ovs_dp_name(const struct datapath *dp)
 137 {
 138         struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
 139         return vport->ops->get_name(vport);
 140 }
 141
 142 static int get_dpifindex(struct datapath *dp)
 143 {
 144         struct vport *local;
 145         int ifindex;
 146
 147         rcu_read_lock();
 148
 149         local = ovs_vport_rcu(dp, OVSP_LOCAL);
 150         if (local)
 151                 ifindex = netdev_vport_priv(local)->dev->ifindex;
 152         else
 153                 ifindex = 0;
 154
 155         rcu_read_unlock();
 156
 157         return ifindex;
 158 }
 159
 160 static void destroy_dp_rcu(struct rcu_head *rcu)
 161 {
 162         struct datapath *dp = container_of(rcu, struct datapath, rcu);
 163
 164         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->syncp);
 260         (*stats_counter)++;
 261         stats->n_mask_hit += n_mask_hit;
 262         u64_stats_update_end(&stats->syncp);
 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->syncp);
 299         stats->n_lost++;
 300         u64_stats_update_end(&stats->syncp);
 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         err = skb_zerocopy(user_skb, skb, skb->len, hlen);
 468         if (err)
 469                 goto out;
 470
 471         /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
 472         if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
 473                 size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len;
 474
 475                 if (plen > 0)
 476                         memset(skb_put(user_skb, plen), 0, plen);
 477         }
 478
 479         ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
 480
 481         err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
 482 out:
 483         if (err)
 484                 skb_tx_error(skb);
 485         kfree_skb(nskb);
 486         return err;
 487 }
 488
 489 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 490 {
 491         struct ovs_header *ovs_header = info->userhdr;
 492         struct nlattr **a = info->attrs;
 493         struct sw_flow_actions *acts;
 494         struct sk_buff *packet;
 495         struct sw_flow *flow;
 496         struct datapath *dp;
 497         struct ethhdr *eth;
 498         int len;
 499         int err;
 500
 501         err = -EINVAL;
 502         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 503             !a[OVS_PACKET_ATTR_ACTIONS])
 504                 goto err;
 505
 506         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 507         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 508         err = -ENOMEM;
 509         if (!packet)
 510                 goto err;
 511         skb_reserve(packet, NET_IP_ALIGN);
 512
 513         nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
 514
 515         skb_reset_mac_header(packet);
 516         eth = eth_hdr(packet);
 517
 518         /* Normally, setting the skb 'protocol' field would be handled by a
 519          * call to eth_type_trans(), but it assumes there's a sending
 520          * device, which we may not have. */
 521         if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
 522                 packet->protocol = eth->h_proto;
 523         else
 524                 packet->protocol = htons(ETH_P_802_2);
 525
 526         /* Build an sw_flow for sending this packet. */
 527         flow = ovs_flow_alloc(false);
 528         err = PTR_ERR(flow);
 529         if (IS_ERR(flow))
 530                 goto err_kfree_skb;
 531
 532         err = ovs_flow_extract(packet, -1, &flow->key);
 533         if (err)
 534                 goto err_flow_free;
 535
 536         err = ovs_nla_get_flow_metadata(flow, a[OVS_PACKET_ATTR_KEY]);
 537         if (err)
 538                 goto err_flow_free;
 539         acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
 540         err = PTR_ERR(acts);
 541         if (IS_ERR(acts))
 542                 goto err_flow_free;
 543
 544         err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
 545                                    &flow->key, 0, &acts);
 546         rcu_assign_pointer(flow->sf_acts, acts);
 547         if (err)
 548                 goto err_flow_free;
 549
 550         OVS_CB(packet)->flow = flow;
 551         OVS_CB(packet)->pkt_key = &flow->key;
 552         packet->priority = flow->key.phy.priority;
 553         packet->mark = flow->key.phy.skb_mark;
 554
 555         rcu_read_lock();
 556         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 557         err = -ENODEV;
 558         if (!dp)
 559                 goto err_unlock;
 560
 561         local_bh_disable();
 562         err = ovs_execute_actions(dp, packet);
 563         local_bh_enable();
 564         rcu_read_unlock();
 565
 566         ovs_flow_free(flow, false);
 567         return err;
 568
 569 err_unlock:
 570         rcu_read_unlock();
 571 err_flow_free:
 572         ovs_flow_free(flow, false);
 573 err_kfree_skb:
 574         kfree_skb(packet);
 575 err:
 576         return err;
 577 }
 578
 579 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 580         [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
 581         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 582         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 583 };
 584
 585 static const struct genl_ops dp_packet_genl_ops[] = {
 586         { .cmd = OVS_PACKET_CMD_EXECUTE,
 587           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 588           .policy = packet_policy,
 589           .doit = ovs_packet_cmd_execute
 590         }
 591 };
 592
 593 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats,
 594                          struct ovs_dp_megaflow_stats *mega_stats)
 595 {
 596         int i;
 597
 598         memset(mega_stats, 0, sizeof(*mega_stats));
 599
 600         stats->n_flows = ovs_flow_tbl_count(&dp->table);
 601         mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
 602
 603         stats->n_hit = stats->n_missed = stats->n_lost = 0;
 604
 605         for_each_possible_cpu(i) {
 606                 const struct dp_stats_percpu *percpu_stats;
 607                 struct dp_stats_percpu local_stats;
 608                 unsigned int start;
 609
 610                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 611
 612                 do {
 613                         start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
 614                         local_stats = *percpu_stats;
 615                 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
 616
 617                 stats->n_hit += local_stats.n_hit;
 618                 stats->n_missed += local_stats.n_missed;
 619                 stats->n_lost += local_stats.n_lost;
 620                 mega_stats->n_mask_hit += local_stats.n_mask_hit;
 621         }
 622 }
 623
 624 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
 625         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
 626         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
 627         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
 628 };
 629
 630 static struct genl_family dp_flow_genl_family = {
 631         .id = GENL_ID_GENERATE,
 632         .hdrsize = sizeof(struct ovs_header),
 633         .name = OVS_FLOW_FAMILY,
 634         .version = OVS_FLOW_VERSION,
 635         .maxattr = OVS_FLOW_ATTR_MAX,
 636         .netnsok = true,
 637         .parallel_ops = true,
 638 };
 639
 640 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
 641         .name = OVS_FLOW_MCGROUP
 642 };
 643
 644 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
 645 {
 646         return NLMSG_ALIGN(sizeof(struct ovs_header))
 647                 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
 648                 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
 649                 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
 650                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
 651                 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
 652                 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
 653 }
 654
 655 /* Called with ovs_mutex. */
 656 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
 657                                   struct sk_buff *skb, u32 portid,
 658                                   u32 seq, u32 flags, u8 cmd)
 659 {
 660         const int skb_orig_len = skb->len;
 661         struct nlattr *start;
 662         struct ovs_flow_stats stats;
 663         __be16 tcp_flags;
 664         unsigned long used;
 665         struct ovs_header *ovs_header;
 666         struct nlattr *nla;
 667         int err;
 668
 669         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
 670         if (!ovs_header)
 671                 return -EMSGSIZE;
 672
 673         ovs_header->dp_ifindex = get_dpifindex(dp);
 674
 675         /* Fill flow key. */
 676         nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
 677         if (!nla)
 678                 goto nla_put_failure;
 679
 680         err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb);
 681         if (err)
 682                 goto error;
 683         nla_nest_end(skb, nla);
 684
 685         nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
 686         if (!nla)
 687                 goto nla_put_failure;
 688
 689         err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb);
 690         if (err)
 691                 goto error;
 692
 693         nla_nest_end(skb, nla);
 694
 695         ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
 696         if (used &&
 697             nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
 698                 goto nla_put_failure;
 699
 700         if (stats.n_packets &&
 701             nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
 702                 goto nla_put_failure;
 703
 704         if ((u8)ntohs(tcp_flags) &&
 705              nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
 706                 goto nla_put_failure;
 707
 708         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 709          * this is the first flow to be dumped into 'skb'.  This is unusual for
 710          * Netlink but individual action lists can be longer than
 711          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 712          * The userspace caller can always fetch the actions separately if it
 713          * really wants them.  (Most userspace callers in fact don't care.)
 714          *
 715          * This can only fail for dump operations because the skb is always
 716          * properly sized for single flows.
 717          */
 718         start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
 719         if (start) {
 720                 const struct sw_flow_actions *sf_acts;
 721
 722                 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
 723
 724                 err = ovs_nla_put_actions(sf_acts->actions,
 725                                           sf_acts->actions_len, skb);
 726                 if (!err)
 727                         nla_nest_end(skb, start);
 728                 else {
 729                         if (skb_orig_len)
 730                                 goto error;
 731
 732                         nla_nest_cancel(skb, start);
 733                 }
 734         } else if (skb_orig_len)
 735                 goto nla_put_failure;
 736
 737         return genlmsg_end(skb, ovs_header);
 738
 739 nla_put_failure:
 740         err = -EMSGSIZE;
 741 error:
 742         genlmsg_cancel(skb, ovs_header);
 743         return err;
 744 }
 745
 746 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow,
 747                                                struct genl_info *info)
 748 {
 749         size_t len;
 750
 751         len = ovs_flow_cmd_msg_size(ovsl_dereference(flow->sf_acts));
 752
 753         return genlmsg_new_unicast(len, info, GFP_KERNEL);
 754 }
 755
 756 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
 757                                                struct datapath *dp,
 758                                                struct genl_info *info,
 759                                                u8 cmd)
 760 {
 761         struct sk_buff *skb;
 762         int retval;
 763
 764         skb = ovs_flow_cmd_alloc_info(flow, info);
 765         if (!skb)
 766                 return ERR_PTR(-ENOMEM);
 767
 768         retval = ovs_flow_cmd_fill_info(flow, dp, skb, info->snd_portid,
 769                                         info->snd_seq, 0, cmd);
 770         BUG_ON(retval < 0);
 771         return skb;
 772 }
 773
 774 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
 775 {
 776         struct nlattr **a = info->attrs;
 777         struct ovs_header *ovs_header = info->userhdr;
 778         struct sw_flow_key key, masked_key;
 779         struct sw_flow *flow = NULL;
 780         struct sw_flow_mask mask;
 781         struct sk_buff *reply;
 782         struct datapath *dp;
 783         struct sw_flow_actions *acts = NULL;
 784         struct sw_flow_match match;
 785         bool exact_5tuple;
 786         int error;
 787
 788         /* Extract key. */
 789         error = -EINVAL;
 790         if (!a[OVS_FLOW_ATTR_KEY])
 791                 goto error;
 792
 793         ovs_match_init(&match, &key, &mask);
 794         error = ovs_nla_get_match(&match, &exact_5tuple,
 795                                   a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
 796         if (error)
 797                 goto error;
 798
 799         /* Validate actions. */
 800         if (a[OVS_FLOW_ATTR_ACTIONS]) {
 801                 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
 802                 error = PTR_ERR(acts);
 803                 if (IS_ERR(acts))
 804                         goto error;
 805
 806                 ovs_flow_mask_key(&masked_key, &key, &mask);
 807                 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS],
 808                                              &masked_key, 0, &acts);
 809                 if (error) {
 810                         OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
 811                         goto err_kfree;
 812                 }
 813         } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
 814                 error = -EINVAL;
 815                 goto error;
 816         }
 817
 818         ovs_lock();
 819         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 820         error = -ENODEV;
 821         if (!dp)
 822                 goto err_unlock_ovs;
 823
 824         /* Check if this is a duplicate flow */
 825         flow = ovs_flow_tbl_lookup(&dp->table, &key);
 826         if (!flow) {
 827                 /* Bail out if we're not allowed to create a new flow. */
 828                 error = -ENOENT;
 829                 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
 830                         goto err_unlock_ovs;
 831
 832                 /* Allocate flow. */
 833                 flow = ovs_flow_alloc(!exact_5tuple);
 834                 if (IS_ERR(flow)) {
 835                         error = PTR_ERR(flow);
 836                         goto err_unlock_ovs;
 837                 }
 838
 839                 flow->key = masked_key;
 840                 flow->unmasked_key = key;
 841                 rcu_assign_pointer(flow->sf_acts, acts);
 842
 843                 /* Put flow in bucket. */
 844                 error = ovs_flow_tbl_insert(&dp->table, flow, &mask);
 845                 if (error) {
 846                         acts = NULL;
 847                         goto err_flow_free;
 848                 }
 849
 850                 reply = ovs_flow_cmd_build_info(flow, dp, info, OVS_FLOW_CMD_NEW);
 851         } else {
 852                 /* We found a matching flow. */
 853                 struct sw_flow_actions *old_acts;
 854
 855                 /* Bail out if we're not allowed to modify an existing flow.
 856                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
 857                  * because Generic Netlink treats the latter as a dump
 858                  * request.  We also accept NLM_F_EXCL in case that bug ever
 859                  * gets fixed.
 860                  */
 861                 error = -EEXIST;
 862                 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
 863                     info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
 864                         goto err_unlock_ovs;
 865
 866                 /* The unmasked key has to be the same for flow updates. */
 867                 if (!ovs_flow_cmp_unmasked_key(flow, &match))
 868                         goto err_unlock_ovs;
 869
 870                 /* Update actions. */
 871                 old_acts = ovsl_dereference(flow->sf_acts);
 872                 rcu_assign_pointer(flow->sf_acts, acts);
 873                 ovs_nla_free_flow_actions(old_acts);
 874
 875                 reply = ovs_flow_cmd_build_info(flow, dp, info, OVS_FLOW_CMD_NEW);
 876
 877                 /* Clear stats. */
 878                 if (a[OVS_FLOW_ATTR_CLEAR])
 879                         ovs_flow_stats_clear(flow);
 880         }
 881         ovs_unlock();
 882
 883         if (!IS_ERR(reply))
 884                 ovs_notify(&dp_flow_genl_family, reply, info);
 885         else
 886                 genl_set_err(&dp_flow_genl_family, sock_net(skb->sk), 0,
 887                              0, PTR_ERR(reply));
 888         return 0;
 889
 890 err_flow_free:
 891         ovs_flow_free(flow, false);
 892 err_unlock_ovs:
 893         ovs_unlock();
 894 err_kfree:
 895         kfree(acts);
 896 error:
 897         return error;
 898 }
 899
 900 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
 901 {
 902         struct nlattr **a = info->attrs;
 903         struct ovs_header *ovs_header = info->userhdr;
 904         struct sw_flow_key key;
 905         struct sk_buff *reply;
 906         struct sw_flow *flow;
 907         struct datapath *dp;
 908         struct sw_flow_match match;
 909         int err;
 910
 911         if (!a[OVS_FLOW_ATTR_KEY]) {
 912                 OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
 913                 return -EINVAL;
 914         }
 915
 916         ovs_match_init(&match, &key, NULL);
 917         err = ovs_nla_get_match(&match, NULL, a[OVS_FLOW_ATTR_KEY], NULL);
 918         if (err)
 919                 return err;
 920
 921         ovs_lock();
 922         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 923         if (!dp) {
 924                 err = -ENODEV;
 925                 goto unlock;
 926         }
 927
 928         flow = ovs_flow_tbl_lookup(&dp->table, &key);
 929         if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) {
 930                 err = -ENOENT;
 931                 goto unlock;
 932         }
 933
 934         reply = ovs_flow_cmd_build_info(flow, dp, info, 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, NULL, 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, info);
 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(&dp_flow_genl_family, reply, info);
 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 const 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         [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1068 };
1069
1070 static struct genl_family dp_datapath_genl_family = {
1071         .id = GENL_ID_GENERATE,
1072         .hdrsize = sizeof(struct ovs_header),
1073         .name = OVS_DATAPATH_FAMILY,
1074         .version = OVS_DATAPATH_VERSION,
1075         .maxattr = OVS_DP_ATTR_MAX,
1076         .netnsok = true,
1077         .parallel_ops = true,
1078 };
1079
1080 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1081         .name = OVS_DATAPATH_MCGROUP
1082 };
1083
1084 static size_t ovs_dp_cmd_msg_size(void)
1085 {
1086         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1087
1088         msgsize += nla_total_size(IFNAMSIZ);
1089         msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1090         msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1091         msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1092
1093         return msgsize;
1094 }
1095
1096 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1097                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1098 {
1099         struct ovs_header *ovs_header;
1100         struct ovs_dp_stats dp_stats;
1101         struct ovs_dp_megaflow_stats dp_megaflow_stats;
1102         int err;
1103
1104         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1105                                    flags, cmd);
1106         if (!ovs_header)
1107                 goto error;
1108
1109         ovs_header->dp_ifindex = get_dpifindex(dp);
1110
1111         rcu_read_lock();
1112         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1113         rcu_read_unlock();
1114         if (err)
1115                 goto nla_put_failure;
1116
1117         get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1118         if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1119                         &dp_stats))
1120                 goto nla_put_failure;
1121
1122         if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1123                         sizeof(struct ovs_dp_megaflow_stats),
1124                         &dp_megaflow_stats))
1125                 goto nla_put_failure;
1126
1127         if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1128                 goto nla_put_failure;
1129
1130         return genlmsg_end(skb, ovs_header);
1131
1132 nla_put_failure:
1133         genlmsg_cancel(skb, ovs_header);
1134 error:
1135         return -EMSGSIZE;
1136 }
1137
1138 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp,
1139                                              struct genl_info *info, u8 cmd)
1140 {
1141         struct sk_buff *skb;
1142         int retval;
1143
1144         skb = genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1145         if (!skb)
1146                 return ERR_PTR(-ENOMEM);
1147
1148         retval = ovs_dp_cmd_fill_info(dp, skb, info->snd_portid, info->snd_seq, 0, cmd);
1149         if (retval < 0) {
1150                 kfree_skb(skb);
1151                 return ERR_PTR(retval);
1152         }
1153         return skb;
1154 }
1155
1156 /* Called with ovs_mutex. */
1157 static struct datapath *lookup_datapath(struct net *net,
1158                                         struct ovs_header *ovs_header,
1159                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1160 {
1161         struct datapath *dp;
1162
1163         if (!a[OVS_DP_ATTR_NAME])
1164                 dp = get_dp(net, ovs_header->dp_ifindex);
1165         else {
1166                 struct vport *vport;
1167
1168                 rcu_read_lock();
1169                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1170                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1171                 rcu_read_unlock();
1172         }
1173         return dp ? dp : ERR_PTR(-ENODEV);
1174 }
1175
1176 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1177 {
1178         struct datapath *dp;
1179
1180         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1181         if (IS_ERR(dp))
1182                 return;
1183
1184         WARN(dp->user_features, "Dropping previously announced user features\n");
1185         dp->user_features = 0;
1186 }
1187
1188 static void ovs_dp_change(struct datapath *dp, struct nlattr **a)
1189 {
1190         if (a[OVS_DP_ATTR_USER_FEATURES])
1191                 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1192 }
1193
1194 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1195 {
1196         struct nlattr **a = info->attrs;
1197         struct vport_parms parms;
1198         struct sk_buff *reply;
1199         struct datapath *dp;
1200         struct vport *vport;
1201         struct ovs_net *ovs_net;
1202         int err, i;
1203
1204         err = -EINVAL;
1205         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1206                 goto err;
1207
1208         ovs_lock();
1209
1210         err = -ENOMEM;
1211         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1212         if (dp == NULL)
1213                 goto err_unlock_ovs;
1214
1215         ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1216
1217         /* Allocate table. */
1218         err = ovs_flow_tbl_init(&dp->table);
1219         if (err)
1220                 goto err_free_dp;
1221
1222         dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1223         if (!dp->stats_percpu) {
1224                 err = -ENOMEM;
1225                 goto err_destroy_table;
1226         }
1227
1228         dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1229                             GFP_KERNEL);
1230         if (!dp->ports) {
1231                 err = -ENOMEM;
1232                 goto err_destroy_percpu;
1233         }
1234
1235         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1236                 INIT_HLIST_HEAD(&dp->ports[i]);
1237
1238         /* Set up our datapath device. */
1239         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1240         parms.type = OVS_VPORT_TYPE_INTERNAL;
1241         parms.options = NULL;
1242         parms.dp = dp;
1243         parms.port_no = OVSP_LOCAL;
1244         parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1245
1246         ovs_dp_change(dp, a);
1247
1248         vport = new_vport(&parms);
1249         if (IS_ERR(vport)) {
1250                 err = PTR_ERR(vport);
1251                 if (err == -EBUSY)
1252                         err = -EEXIST;
1253
1254                 if (err == -EEXIST) {
1255                         /* An outdated user space instance that does not understand
1256                          * the concept of user_features has attempted to create a new
1257                          * datapath and is likely to reuse it. Drop all user features.
1258                          */
1259                         if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1260                                 ovs_dp_reset_user_features(skb, info);
1261                 }
1262
1263                 goto err_destroy_ports_array;
1264         }
1265
1266         reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW);
1267         err = PTR_ERR(reply);
1268         if (IS_ERR(reply))
1269                 goto err_destroy_local_port;
1270
1271         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1272         list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1273
1274         ovs_unlock();
1275
1276         ovs_notify(&dp_datapath_genl_family, reply, info);
1277         return 0;
1278
1279 err_destroy_local_port:
1280         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1281 err_destroy_ports_array:
1282         kfree(dp->ports);
1283 err_destroy_percpu:
1284         free_percpu(dp->stats_percpu);
1285 err_destroy_table:
1286         ovs_flow_tbl_destroy(&dp->table, false);
1287 err_free_dp:
1288         release_net(ovs_dp_get_net(dp));
1289         kfree(dp);
1290 err_unlock_ovs:
1291         ovs_unlock();
1292 err:
1293         return err;
1294 }
1295
1296 /* Called with ovs_mutex. */
1297 static void __dp_destroy(struct datapath *dp)
1298 {
1299         int i;
1300
1301         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1302                 struct vport *vport;
1303                 struct hlist_node *n;
1304
1305                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1306                         if (vport->port_no != OVSP_LOCAL)
1307                                 ovs_dp_detach_port(vport);
1308         }
1309
1310         list_del_rcu(&dp->list_node);
1311
1312         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1313          * all ports in datapath are destroyed first before freeing datapath.
1314          */
1315         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1316
1317         /* RCU destroy the flow table */
1318         ovs_flow_tbl_destroy(&dp->table, true);
1319
1320         call_rcu(&dp->rcu, destroy_dp_rcu);
1321 }
1322
1323 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1324 {
1325         struct sk_buff *reply;
1326         struct datapath *dp;
1327         int err;
1328
1329         ovs_lock();
1330         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1331         err = PTR_ERR(dp);
1332         if (IS_ERR(dp))
1333                 goto unlock;
1334
1335         reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_DEL);
1336         err = PTR_ERR(reply);
1337         if (IS_ERR(reply))
1338                 goto unlock;
1339
1340         __dp_destroy(dp);
1341         ovs_unlock();
1342
1343         ovs_notify(&dp_datapath_genl_family, reply, info);
1344
1345         return 0;
1346 unlock:
1347         ovs_unlock();
1348         return err;
1349 }
1350
1351 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1352 {
1353         struct sk_buff *reply;
1354         struct datapath *dp;
1355         int err;
1356
1357         ovs_lock();
1358         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1359         err = PTR_ERR(dp);
1360         if (IS_ERR(dp))
1361                 goto unlock;
1362
1363         ovs_dp_change(dp, info->attrs);
1364
1365         reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW);
1366         if (IS_ERR(reply)) {
1367                 err = PTR_ERR(reply);
1368                 genl_set_err(&dp_datapath_genl_family, sock_net(skb->sk), 0,
1369                              0, err);
1370                 err = 0;
1371                 goto unlock;
1372         }
1373
1374         ovs_unlock();
1375         ovs_notify(&dp_datapath_genl_family, reply, info);
1376
1377         return 0;
1378 unlock:
1379         ovs_unlock();
1380         return err;
1381 }
1382
1383 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1384 {
1385         struct sk_buff *reply;
1386         struct datapath *dp;
1387         int err;
1388
1389         ovs_lock();
1390         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1391         if (IS_ERR(dp)) {
1392                 err = PTR_ERR(dp);
1393                 goto unlock;
1394         }
1395
1396         reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW);
1397         if (IS_ERR(reply)) {
1398                 err = PTR_ERR(reply);
1399                 goto unlock;
1400         }
1401
1402         ovs_unlock();
1403         return genlmsg_reply(reply, info);
1404
1405 unlock:
1406         ovs_unlock();
1407         return err;
1408 }
1409
1410 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1411 {
1412         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1413         struct datapath *dp;
1414         int skip = cb->args[0];
1415         int i = 0;
1416
1417         rcu_read_lock();
1418         list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1419                 if (i >= skip &&
1420                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1421                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1422                                          OVS_DP_CMD_NEW) < 0)
1423                         break;
1424                 i++;
1425         }
1426         rcu_read_unlock();
1427
1428         cb->args[0] = i;
1429
1430         return skb->len;
1431 }
1432
1433 static const struct genl_ops dp_datapath_genl_ops[] = {
1434         { .cmd = OVS_DP_CMD_NEW,
1435           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1436           .policy = datapath_policy,
1437           .doit = ovs_dp_cmd_new
1438         },
1439         { .cmd = OVS_DP_CMD_DEL,
1440           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1441           .policy = datapath_policy,
1442           .doit = ovs_dp_cmd_del
1443         },
1444         { .cmd = OVS_DP_CMD_GET,
1445           .flags = 0,               /* OK for unprivileged users. */
1446           .policy = datapath_policy,
1447           .doit = ovs_dp_cmd_get,
1448           .dumpit = ovs_dp_cmd_dump
1449         },
1450         { .cmd = OVS_DP_CMD_SET,
1451           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1452           .policy = datapath_policy,
1453           .doit = ovs_dp_cmd_set,
1454         },
1455 };
1456
1457 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1458         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1459         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1460         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1461         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1462         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1463         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1464 };
1465
1466 struct genl_family dp_vport_genl_family = {
1467         .id = GENL_ID_GENERATE,
1468         .hdrsize = sizeof(struct ovs_header),
1469         .name = OVS_VPORT_FAMILY,
1470         .version = OVS_VPORT_VERSION,
1471         .maxattr = OVS_VPORT_ATTR_MAX,
1472         .netnsok = true,
1473         .parallel_ops = true,
1474 };
1475
1476 static struct genl_multicast_group ovs_dp_vport_multicast_group = {
1477         .name = OVS_VPORT_MCGROUP
1478 };
1479
1480 /* Called with ovs_mutex or RCU read lock. */
1481 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1482                                    u32 portid, u32 seq, u32 flags, u8 cmd)
1483 {
1484         struct ovs_header *ovs_header;
1485         struct ovs_vport_stats vport_stats;
1486         int err;
1487
1488         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1489                                  flags, cmd);
1490         if (!ovs_header)
1491                 return -EMSGSIZE;
1492
1493         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1494
1495         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1496             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1497             nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1498             nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
1499                 goto nla_put_failure;
1500
1501         ovs_vport_get_stats(vport, &vport_stats);
1502         if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1503                     &vport_stats))
1504                 goto nla_put_failure;
1505
1506         err = ovs_vport_get_options(vport, skb);
1507         if (err == -EMSGSIZE)
1508                 goto error;
1509
1510         return genlmsg_end(skb, ovs_header);
1511
1512 nla_put_failure:
1513         err = -EMSGSIZE;
1514 error:
1515         genlmsg_cancel(skb, ovs_header);
1516         return err;
1517 }
1518
1519 /* Called with ovs_mutex or RCU read lock. */
1520 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1521                                          u32 seq, u8 cmd)
1522 {
1523         struct sk_buff *skb;
1524         int retval;
1525
1526         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1527         if (!skb)
1528                 return ERR_PTR(-ENOMEM);
1529
1530         retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1531         BUG_ON(retval < 0);
1532
1533         return skb;
1534 }
1535
1536 /* Called with ovs_mutex or RCU read lock. */
1537 static struct vport *lookup_vport(struct net *net,
1538                                   struct ovs_header *ovs_header,
1539                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1540 {
1541         struct datapath *dp;
1542         struct vport *vport;
1543
1544         if (a[OVS_VPORT_ATTR_NAME]) {
1545                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1546                 if (!vport)
1547                         return ERR_PTR(-ENODEV);
1548                 if (ovs_header->dp_ifindex &&
1549                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1550                         return ERR_PTR(-ENODEV);
1551                 return vport;
1552         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1553                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1554
1555                 if (port_no >= DP_MAX_PORTS)
1556                         return ERR_PTR(-EFBIG);
1557
1558                 dp = get_dp(net, ovs_header->dp_ifindex);
1559                 if (!dp)
1560                         return ERR_PTR(-ENODEV);
1561
1562                 vport = ovs_vport_ovsl_rcu(dp, port_no);
1563                 if (!vport)
1564                         return ERR_PTR(-ENODEV);
1565                 return vport;
1566         } else
1567                 return ERR_PTR(-EINVAL);
1568 }
1569
1570 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1571 {
1572         struct nlattr **a = info->attrs;
1573         struct ovs_header *ovs_header = info->userhdr;
1574         struct vport_parms parms;
1575         struct sk_buff *reply;
1576         struct vport *vport;
1577         struct datapath *dp;
1578         u32 port_no;
1579         int err;
1580
1581         err = -EINVAL;
1582         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1583             !a[OVS_VPORT_ATTR_UPCALL_PID])
1584                 goto exit;
1585
1586         ovs_lock();
1587         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1588         err = -ENODEV;
1589         if (!dp)
1590                 goto exit_unlock;
1591
1592         if (a[OVS_VPORT_ATTR_PORT_NO]) {
1593                 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1594
1595                 err = -EFBIG;
1596                 if (port_no >= DP_MAX_PORTS)
1597                         goto exit_unlock;
1598
1599                 vport = ovs_vport_ovsl(dp, port_no);
1600                 err = -EBUSY;
1601                 if (vport)
1602                         goto exit_unlock;
1603         } else {
1604                 for (port_no = 1; ; port_no++) {
1605                         if (port_no >= DP_MAX_PORTS) {
1606                                 err = -EFBIG;
1607                                 goto exit_unlock;
1608                         }
1609                         vport = ovs_vport_ovsl(dp, port_no);
1610                         if (!vport)
1611                                 break;
1612                 }
1613         }
1614
1615         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1616         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1617         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1618         parms.dp = dp;
1619         parms.port_no = port_no;
1620         parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1621
1622         vport = new_vport(&parms);
1623         err = PTR_ERR(vport);
1624         if (IS_ERR(vport))
1625                 goto exit_unlock;
1626
1627         err = 0;
1628         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1629                                          OVS_VPORT_CMD_NEW);
1630         if (IS_ERR(reply)) {
1631                 err = PTR_ERR(reply);
1632                 ovs_dp_detach_port(vport);
1633                 goto exit_unlock;
1634         }
1635
1636         ovs_notify(&dp_vport_genl_family, reply, info);
1637
1638 exit_unlock:
1639         ovs_unlock();
1640 exit:
1641         return err;
1642 }
1643
1644 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1645 {
1646         struct nlattr **a = info->attrs;
1647         struct sk_buff *reply;
1648         struct vport *vport;
1649         int err;
1650
1651         ovs_lock();
1652         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1653         err = PTR_ERR(vport);
1654         if (IS_ERR(vport))
1655                 goto exit_unlock;
1656
1657         if (a[OVS_VPORT_ATTR_TYPE] &&
1658             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1659                 err = -EINVAL;
1660                 goto exit_unlock;
1661         }
1662
1663         reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1664         if (!reply) {
1665                 err = -ENOMEM;
1666                 goto exit_unlock;
1667         }
1668
1669         if (a[OVS_VPORT_ATTR_OPTIONS]) {
1670                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1671                 if (err)
1672                         goto exit_free;
1673         }
1674
1675         if (a[OVS_VPORT_ATTR_UPCALL_PID])
1676                 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1677
1678         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1679                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1680         BUG_ON(err < 0);
1681
1682         ovs_unlock();
1683         ovs_notify(&dp_vport_genl_family, reply, info);
1684         return 0;
1685
1686 exit_free:
1687         kfree_skb(reply);
1688 exit_unlock:
1689         ovs_unlock();
1690         return err;
1691 }
1692
1693 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1694 {
1695         struct nlattr **a = info->attrs;
1696         struct sk_buff *reply;
1697         struct vport *vport;
1698         int err;
1699
1700         ovs_lock();
1701         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1702         err = PTR_ERR(vport);
1703         if (IS_ERR(vport))
1704                 goto exit_unlock;
1705
1706         if (vport->port_no == OVSP_LOCAL) {
1707                 err = -EINVAL;
1708                 goto exit_unlock;
1709         }
1710
1711         reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
1712                                          info->snd_seq, OVS_VPORT_CMD_DEL);
1713         err = PTR_ERR(reply);
1714         if (IS_ERR(reply))
1715                 goto exit_unlock;
1716
1717         err = 0;
1718         ovs_dp_detach_port(vport);
1719
1720         ovs_notify(&dp_vport_genl_family, reply, info);
1721
1722 exit_unlock:
1723         ovs_unlock();
1724         return err;
1725 }
1726
1727 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1728 {
1729         struct nlattr **a = info->attrs;
1730         struct ovs_header *ovs_header = info->userhdr;
1731         struct sk_buff *reply;
1732         struct vport *vport;
1733         int err;
1734
1735         rcu_read_lock();
1736         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1737         err = PTR_ERR(vport);
1738         if (IS_ERR(vport))
1739                 goto exit_unlock;
1740
1741         reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
1742                                          info->snd_seq, OVS_VPORT_CMD_NEW);
1743         err = PTR_ERR(reply);
1744         if (IS_ERR(reply))
1745                 goto exit_unlock;
1746
1747         rcu_read_unlock();
1748
1749         return genlmsg_reply(reply, info);
1750
1751 exit_unlock:
1752         rcu_read_unlock();
1753         return err;
1754 }
1755
1756 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1757 {
1758         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1759         struct datapath *dp;
1760         int bucket = cb->args[0], skip = cb->args[1];
1761         int i, j = 0;
1762
1763         rcu_read_lock();
1764         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1765         if (!dp) {
1766                 rcu_read_unlock();
1767                 return -ENODEV;
1768         }
1769         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1770                 struct vport *vport;
1771
1772                 j = 0;
1773                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1774                         if (j >= skip &&
1775                             ovs_vport_cmd_fill_info(vport, skb,
1776                                                     NETLINK_CB(cb->skb).portid,
1777                                                     cb->nlh->nlmsg_seq,
1778                                                     NLM_F_MULTI,
1779                                                     OVS_VPORT_CMD_NEW) < 0)
1780                                 goto out;
1781
1782                         j++;
1783                 }
1784                 skip = 0;
1785         }
1786 out:
1787         rcu_read_unlock();
1788
1789         cb->args[0] = i;
1790         cb->args[1] = j;
1791
1792         return skb->len;
1793 }
1794
1795 static const struct genl_ops dp_vport_genl_ops[] = {
1796         { .cmd = OVS_VPORT_CMD_NEW,
1797           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1798           .policy = vport_policy,
1799           .doit = ovs_vport_cmd_new
1800         },
1801         { .cmd = OVS_VPORT_CMD_DEL,
1802           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1803           .policy = vport_policy,
1804           .doit = ovs_vport_cmd_del
1805         },
1806         { .cmd = OVS_VPORT_CMD_GET,
1807           .flags = 0,               /* OK for unprivileged users. */
1808           .policy = vport_policy,
1809           .doit = ovs_vport_cmd_get,
1810           .dumpit = ovs_vport_cmd_dump
1811         },
1812         { .cmd = OVS_VPORT_CMD_SET,
1813           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1814           .policy = vport_policy,
1815           .doit = ovs_vport_cmd_set,
1816         },
1817 };
1818
1819 struct genl_family_and_ops {
1820         struct genl_family *family;
1821         const struct genl_ops *ops;
1822         int n_ops;
1823         const struct genl_multicast_group *group;
1824 };
1825
1826 static const struct genl_family_and_ops dp_genl_families[] = {
1827         { &dp_datapath_genl_family,
1828           dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1829           &ovs_dp_datapath_multicast_group },
1830         { &dp_vport_genl_family,
1831           dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1832           &ovs_dp_vport_multicast_group },
1833         { &dp_flow_genl_family,
1834           dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1835           &ovs_dp_flow_multicast_group },
1836         { &dp_packet_genl_family,
1837           dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1838           NULL },
1839 };
1840
1841 static void dp_unregister_genl(int n_families)
1842 {
1843         int i;
1844
1845         for (i = 0; i < n_families; i++)
1846                 genl_unregister_family(dp_genl_families[i].family);
1847 }
1848
1849 static int dp_register_genl(void)
1850 {
1851         int n_registered;
1852         int err;
1853         int i;
1854
1855         n_registered = 0;
1856         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1857                 const struct genl_family_and_ops *f = &dp_genl_families[i];
1858
1859                 f->family->ops = f->ops;
1860                 f->family->n_ops = f->n_ops;
1861                 f->family->mcgrps = f->group;
1862                 f->family->n_mcgrps = f->group ? 1 : 0;
1863                 err = genl_register_family(f->family);
1864                 if (err)
1865                         goto error;
1866                 n_registered++;
1867         }
1868
1869         return 0;
1870
1871 error:
1872         dp_unregister_genl(n_registered);
1873         return err;
1874 }
1875
1876 static int __net_init ovs_init_net(struct net *net)
1877 {
1878         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1879
1880         INIT_LIST_HEAD(&ovs_net->dps);
1881         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
1882         return 0;
1883 }
1884
1885 static void __net_exit ovs_exit_net(struct net *net)
1886 {
1887         struct datapath *dp, *dp_next;
1888         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1889
1890         ovs_lock();
1891         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
1892                 __dp_destroy(dp);
1893         ovs_unlock();
1894
1895         cancel_work_sync(&ovs_net->dp_notify_work);
1896 }
1897
1898 static struct pernet_operations ovs_net_ops = {
1899         .init = ovs_init_net,
1900         .exit = ovs_exit_net,
1901         .id   = &ovs_net_id,
1902         .size = sizeof(struct ovs_net),
1903 };
1904
1905 static int __init dp_init(void)
1906 {
1907         int err;
1908
1909         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
1910
1911         pr_info("Open vSwitch switching datapath\n");
1912
1913         err = ovs_flow_init();
1914         if (err)
1915                 goto error;
1916
1917         err = ovs_vport_init();
1918         if (err)
1919                 goto error_flow_exit;
1920
1921         err = register_pernet_device(&ovs_net_ops);
1922         if (err)
1923                 goto error_vport_exit;
1924
1925         err = register_netdevice_notifier(&ovs_dp_device_notifier);
1926         if (err)
1927                 goto error_netns_exit;
1928
1929         err = dp_register_genl();
1930         if (err < 0)
1931                 goto error_unreg_notifier;
1932
1933         return 0;
1934
1935 error_unreg_notifier:
1936         unregister_netdevice_notifier(&ovs_dp_device_notifier);
1937 error_netns_exit:
1938         unregister_pernet_device(&ovs_net_ops);
1939 error_vport_exit:
1940         ovs_vport_exit();
1941 error_flow_exit:
1942         ovs_flow_exit();
1943 error:
1944         return err;
1945 }
1946
1947 static void dp_cleanup(void)
1948 {
1949         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
1950         unregister_netdevice_notifier(&ovs_dp_device_notifier);
1951         unregister_pernet_device(&ovs_net_ops);
1952         rcu_barrier();
1953         ovs_vport_exit();
1954         ovs_flow_exit();
1955 }
1956
1957 module_init(dp_init);
1958 module_exit(dp_cleanup);
1959
1960 MODULE_DESCRIPTION("Open vSwitch switching datapath");
1961 MODULE_LICENSE("GPL");