net/openvswitch/datapath.c

   1 /*
   2  * Copyright (c) 2007-2012 Nicira Networks.
   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/openvswitch.h>
  48 #include <linux/rculist.h>
  49 #include <linux/dmi.h>
  50 #include <linux/workqueue.h>
  51 #include <net/genetlink.h>
  52
  53 #include "datapath.h"
  54 #include "flow.h"
  55 #include "vport-internal_dev.h"
  56
  57 /**
  58  * DOC: Locking:
  59  *
  60  * Writes to device state (add/remove datapath, port, set operations on vports,
  61  * etc.) are protected by RTNL.
  62  *
  63  * Writes to other state (flow table modifications, set miscellaneous datapath
  64  * parameters, etc.) are protected by genl_mutex.  The RTNL lock nests inside
  65  * genl_mutex.
  66  *
  67  * Reads are protected by RCU.
  68  *
  69  * There are a few special cases (mostly stats) that have their own
  70  * synchronization but they nest under all of above and don't interact with
  71  * each other.
  72  */
  73
  74 /* Global list of datapaths to enable dumping them all out.
  75  * Protected by genl_mutex.
  76  */
  77 static LIST_HEAD(dps);
  78
  79 #define REHASH_FLOW_INTERVAL (10 * 60 * HZ)
  80 static void rehash_flow_table(struct work_struct *work);
  81 static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table);
  82
  83 static struct vport *new_vport(const struct vport_parms *);
  84 static int queue_gso_packets(int dp_ifindex, struct sk_buff *,
  85                              const struct dp_upcall_info *);
  86 static int queue_userspace_packet(int dp_ifindex, struct sk_buff *,
  87                                   const struct dp_upcall_info *);
  88
  89 /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */
  90 static struct datapath *get_dp(int dp_ifindex)
  91 {
  92         struct datapath *dp = NULL;
  93         struct net_device *dev;
  94
  95         rcu_read_lock();
  96         dev = dev_get_by_index_rcu(&init_net, dp_ifindex);
  97         if (dev) {
  98                 struct vport *vport = ovs_internal_dev_get_vport(dev);
  99                 if (vport)
 100                         dp = vport->dp;
 101         }
 102         rcu_read_unlock();
 103
 104         return dp;
 105 }
 106
 107 /* Must be called with rcu_read_lock or RTNL lock. */
 108 const char *ovs_dp_name(const struct datapath *dp)
 109 {
 110         struct vport *vport = rcu_dereference_rtnl(dp->ports[OVSP_LOCAL]);
 111         return vport->ops->get_name(vport);
 112 }
 113
 114 static int get_dpifindex(struct datapath *dp)
 115 {
 116         struct vport *local;
 117         int ifindex;
 118
 119         rcu_read_lock();
 120
 121         local = rcu_dereference(dp->ports[OVSP_LOCAL]);
 122         if (local)
 123                 ifindex = local->ops->get_ifindex(local);
 124         else
 125                 ifindex = 0;
 126
 127         rcu_read_unlock();
 128
 129         return ifindex;
 130 }
 131
 132 static void destroy_dp_rcu(struct rcu_head *rcu)
 133 {
 134         struct datapath *dp = container_of(rcu, struct datapath, rcu);
 135
 136         ovs_flow_tbl_destroy((__force struct flow_table *)dp->table);
 137         free_percpu(dp->stats_percpu);
 138         kfree(dp);
 139 }
 140
 141 /* Called with RTNL lock and genl_lock. */
 142 static struct vport *new_vport(const struct vport_parms *parms)
 143 {
 144         struct vport *vport;
 145
 146         vport = ovs_vport_add(parms);
 147         if (!IS_ERR(vport)) {
 148                 struct datapath *dp = parms->dp;
 149
 150                 rcu_assign_pointer(dp->ports[parms->port_no], vport);
 151                 list_add(&vport->node, &dp->port_list);
 152         }
 153
 154         return vport;
 155 }
 156
 157 /* Called with RTNL lock. */
 158 void ovs_dp_detach_port(struct vport *p)
 159 {
 160         ASSERT_RTNL();
 161
 162         /* First drop references to device. */
 163         list_del(&p->node);
 164         rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
 165
 166         /* Then destroy it. */
 167         ovs_vport_del(p);
 168 }
 169
 170 /* Must be called with rcu_read_lock. */
 171 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
 172 {
 173         struct datapath *dp = p->dp;
 174         struct sw_flow *flow;
 175         struct dp_stats_percpu *stats;
 176         struct sw_flow_key key;
 177         u64 *stats_counter;
 178         int error;
 179         int key_len;
 180
 181         stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
 182
 183         /* Extract flow from 'skb' into 'key'. */
 184         error = ovs_flow_extract(skb, p->port_no, &key, &key_len);
 185         if (unlikely(error)) {
 186                 kfree_skb(skb);
 187                 return;
 188         }
 189
 190         /* Look up flow. */
 191         flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len);
 192         if (unlikely(!flow)) {
 193                 struct dp_upcall_info upcall;
 194
 195                 upcall.cmd = OVS_PACKET_CMD_MISS;
 196                 upcall.key = &key;
 197                 upcall.userdata = NULL;
 198                 upcall.pid = p->upcall_pid;
 199                 ovs_dp_upcall(dp, skb, &upcall);
 200                 consume_skb(skb);
 201                 stats_counter = &stats->n_missed;
 202                 goto out;
 203         }
 204
 205         OVS_CB(skb)->flow = flow;
 206
 207         stats_counter = &stats->n_hit;
 208         ovs_flow_used(OVS_CB(skb)->flow, skb);
 209         ovs_execute_actions(dp, skb);
 210
 211 out:
 212         /* Update datapath statistics. */
 213         u64_stats_update_begin(&stats->sync);
 214         (*stats_counter)++;
 215         u64_stats_update_end(&stats->sync);
 216 }
 217
 218 static struct genl_family dp_packet_genl_family = {
 219         .id = GENL_ID_GENERATE,
 220         .hdrsize = sizeof(struct ovs_header),
 221         .name = OVS_PACKET_FAMILY,
 222         .version = OVS_PACKET_VERSION,
 223         .maxattr = OVS_PACKET_ATTR_MAX
 224 };
 225
 226 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
 227               const struct dp_upcall_info *upcall_info)
 228 {
 229         struct dp_stats_percpu *stats;
 230         int dp_ifindex;
 231         int err;
 232
 233         if (upcall_info->pid == 0) {
 234                 err = -ENOTCONN;
 235                 goto err;
 236         }
 237
 238         dp_ifindex = get_dpifindex(dp);
 239         if (!dp_ifindex) {
 240                 err = -ENODEV;
 241                 goto err;
 242         }
 243
 244         if (!skb_is_gso(skb))
 245                 err = queue_userspace_packet(dp_ifindex, skb, upcall_info);
 246         else
 247                 err = queue_gso_packets(dp_ifindex, skb, upcall_info);
 248         if (err)
 249                 goto err;
 250
 251         return 0;
 252
 253 err:
 254         stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
 255
 256         u64_stats_update_begin(&stats->sync);
 257         stats->n_lost++;
 258         u64_stats_update_end(&stats->sync);
 259
 260         return err;
 261 }
 262
 263 static int queue_gso_packets(int dp_ifindex, struct sk_buff *skb,
 264                              const struct dp_upcall_info *upcall_info)
 265 {
 266         struct dp_upcall_info later_info;
 267         struct sw_flow_key later_key;
 268         struct sk_buff *segs, *nskb;
 269         int err;
 270
 271         segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
 272         if (IS_ERR(skb))
 273                 return PTR_ERR(skb);
 274
 275         /* Queue all of the segments. */
 276         skb = segs;
 277         do {
 278                 err = queue_userspace_packet(dp_ifindex, skb, upcall_info);
 279                 if (err)
 280                         break;
 281
 282                 if (skb == segs && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) {
 283                         /* The initial flow key extracted by ovs_flow_extract()
 284                          * in this case is for a first fragment, so we need to
 285                          * properly mark later fragments.
 286                          */
 287                         later_key = *upcall_info->key;
 288                         later_key.ip.frag = OVS_FRAG_TYPE_LATER;
 289
 290                         later_info = *upcall_info;
 291                         later_info.key = &later_key;
 292                         upcall_info = &later_info;
 293                 }
 294         } while ((skb = skb->next));
 295
 296         /* Free all of the segments. */
 297         skb = segs;
 298         do {
 299                 nskb = skb->next;
 300                 if (err)
 301                         kfree_skb(skb);
 302                 else
 303                         consume_skb(skb);
 304         } while ((skb = nskb));
 305         return err;
 306 }
 307
 308 static int queue_userspace_packet(int dp_ifindex, struct sk_buff *skb,
 309                                   const struct dp_upcall_info *upcall_info)
 310 {
 311         struct ovs_header *upcall;
 312         struct sk_buff *nskb = NULL;
 313         struct sk_buff *user_skb; /* to be queued to userspace */
 314         struct nlattr *nla;
 315         unsigned int len;
 316         int err;
 317
 318         if (vlan_tx_tag_present(skb)) {
 319                 nskb = skb_clone(skb, GFP_ATOMIC);
 320                 if (!nskb)
 321                         return -ENOMEM;
 322
 323                 nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb));
 324                 if (!skb)
 325                         return -ENOMEM;
 326
 327                 nskb->vlan_tci = 0;
 328                 skb = nskb;
 329         }
 330
 331         if (nla_attr_size(skb->len) > USHRT_MAX) {
 332                 err = -EFBIG;
 333                 goto out;
 334         }
 335
 336         len = sizeof(struct ovs_header);
 337         len += nla_total_size(skb->len);
 338         len += nla_total_size(FLOW_BUFSIZE);
 339         if (upcall_info->cmd == OVS_PACKET_CMD_ACTION)
 340                 len += nla_total_size(8);
 341
 342         user_skb = genlmsg_new(len, GFP_ATOMIC);
 343         if (!user_skb) {
 344                 err = -ENOMEM;
 345                 goto out;
 346         }
 347
 348         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
 349                              0, upcall_info->cmd);
 350         upcall->dp_ifindex = dp_ifindex;
 351
 352         nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
 353         ovs_flow_to_nlattrs(upcall_info->key, user_skb);
 354         nla_nest_end(user_skb, nla);
 355
 356         if (upcall_info->userdata)
 357                 nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA,
 358                             nla_get_u64(upcall_info->userdata));
 359
 360         nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
 361
 362         skb_copy_and_csum_dev(skb, nla_data(nla));
 363
 364         err = genlmsg_unicast(&init_net, user_skb, upcall_info->pid);
 365
 366 out:
 367         kfree_skb(nskb);
 368         return err;
 369 }
 370
 371 /* Called with genl_mutex. */
 372 static int flush_flows(int dp_ifindex)
 373 {
 374         struct flow_table *old_table;
 375         struct flow_table *new_table;
 376         struct datapath *dp;
 377
 378         dp = get_dp(dp_ifindex);
 379         if (!dp)
 380                 return -ENODEV;
 381
 382         old_table = genl_dereference(dp->table);
 383         new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
 384         if (!new_table)
 385                 return -ENOMEM;
 386
 387         rcu_assign_pointer(dp->table, new_table);
 388
 389         ovs_flow_tbl_deferred_destroy(old_table);
 390         return 0;
 391 }
 392
 393 static int validate_actions(const struct nlattr *attr,
 394                                 const struct sw_flow_key *key, int depth);
 395
 396 static int validate_sample(const struct nlattr *attr,
 397                                 const struct sw_flow_key *key, int depth)
 398 {
 399         const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
 400         const struct nlattr *probability, *actions;
 401         const struct nlattr *a;
 402         int rem;
 403
 404         memset(attrs, 0, sizeof(attrs));
 405         nla_for_each_nested(a, attr, rem) {
 406                 int type = nla_type(a);
 407                 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
 408                         return -EINVAL;
 409                 attrs[type] = a;
 410         }
 411         if (rem)
 412                 return -EINVAL;
 413
 414         probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
 415         if (!probability || nla_len(probability) != sizeof(u32))
 416                 return -EINVAL;
 417
 418         actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
 419         if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
 420                 return -EINVAL;
 421         return validate_actions(actions, key, depth + 1);
 422 }
 423
 424 static int validate_tp_port(const struct sw_flow_key *flow_key)
 425 {
 426         if (flow_key->eth.type == htons(ETH_P_IP)) {
 427                 if (flow_key->ipv4.tp.src && flow_key->ipv4.tp.dst)
 428                         return 0;
 429         } else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
 430                 if (flow_key->ipv6.tp.src && flow_key->ipv6.tp.dst)
 431                         return 0;
 432         }
 433
 434         return -EINVAL;
 435 }
 436
 437 static int validate_set(const struct nlattr *a,
 438                         const struct sw_flow_key *flow_key)
 439 {
 440         const struct nlattr *ovs_key = nla_data(a);
 441         int key_type = nla_type(ovs_key);
 442
 443         /* There can be only one key in a action */
 444         if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
 445                 return -EINVAL;
 446
 447         if (key_type > OVS_KEY_ATTR_MAX ||
 448             nla_len(ovs_key) != ovs_key_lens[key_type])
 449                 return -EINVAL;
 450
 451         switch (key_type) {
 452         const struct ovs_key_ipv4 *ipv4_key;
 453
 454         case OVS_KEY_ATTR_PRIORITY:
 455         case OVS_KEY_ATTR_ETHERNET:
 456                 break;
 457
 458         case OVS_KEY_ATTR_IPV4:
 459                 if (flow_key->eth.type != htons(ETH_P_IP))
 460                         return -EINVAL;
 461
 462                 if (!flow_key->ipv4.addr.src || !flow_key->ipv4.addr.dst)
 463                         return -EINVAL;
 464
 465                 ipv4_key = nla_data(ovs_key);
 466                 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
 467                         return -EINVAL;
 468
 469                 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
 470                         return -EINVAL;
 471
 472                 break;
 473
 474         case OVS_KEY_ATTR_TCP:
 475                 if (flow_key->ip.proto != IPPROTO_TCP)
 476                         return -EINVAL;
 477
 478                 return validate_tp_port(flow_key);
 479
 480         case OVS_KEY_ATTR_UDP:
 481                 if (flow_key->ip.proto != IPPROTO_UDP)
 482                         return -EINVAL;
 483
 484                 return validate_tp_port(flow_key);
 485
 486         default:
 487                 return -EINVAL;
 488         }
 489
 490         return 0;
 491 }
 492
 493 static int validate_userspace(const struct nlattr *attr)
 494 {
 495         static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] =   {
 496                 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
 497                 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 },
 498         };
 499         struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
 500         int error;
 501
 502         error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
 503                                  attr, userspace_policy);
 504         if (error)
 505                 return error;
 506
 507         if (!a[OVS_USERSPACE_ATTR_PID] ||
 508             !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
 509                 return -EINVAL;
 510
 511         return 0;
 512 }
 513
 514 static int validate_actions(const struct nlattr *attr,
 515                                 const struct sw_flow_key *key,  int depth)
 516 {
 517         const struct nlattr *a;
 518         int rem, err;
 519
 520         if (depth >= SAMPLE_ACTION_DEPTH)
 521                 return -EOVERFLOW;
 522
 523         nla_for_each_nested(a, attr, rem) {
 524                 /* Expected argument lengths, (u32)-1 for variable length. */
 525                 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
 526                         [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
 527                         [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
 528                         [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
 529                         [OVS_ACTION_ATTR_POP_VLAN] = 0,
 530                         [OVS_ACTION_ATTR_SET] = (u32)-1,
 531                         [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
 532                 };
 533                 const struct ovs_action_push_vlan *vlan;
 534                 int type = nla_type(a);
 535
 536                 if (type > OVS_ACTION_ATTR_MAX ||
 537                     (action_lens[type] != nla_len(a) &&
 538                      action_lens[type] != (u32)-1))
 539                         return -EINVAL;
 540
 541                 switch (type) {
 542                 case OVS_ACTION_ATTR_UNSPEC:
 543                         return -EINVAL;
 544
 545                 case OVS_ACTION_ATTR_USERSPACE:
 546                         err = validate_userspace(a);
 547                         if (err)
 548                                 return err;
 549                         break;
 550
 551                 case OVS_ACTION_ATTR_OUTPUT:
 552                         if (nla_get_u32(a) >= DP_MAX_PORTS)
 553                                 return -EINVAL;
 554                         break;
 555
 556
 557                 case OVS_ACTION_ATTR_POP_VLAN:
 558                         break;
 559
 560                 case OVS_ACTION_ATTR_PUSH_VLAN:
 561                         vlan = nla_data(a);
 562                         if (vlan->vlan_tpid != htons(ETH_P_8021Q))
 563                                 return -EINVAL;
 564                         if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
 565                                 return -EINVAL;
 566                         break;
 567
 568                 case OVS_ACTION_ATTR_SET:
 569                         err = validate_set(a, key);
 570                         if (err)
 571                                 return err;
 572                         break;
 573
 574                 case OVS_ACTION_ATTR_SAMPLE:
 575                         err = validate_sample(a, key, depth);
 576                         if (err)
 577                                 return err;
 578                         break;
 579
 580                 default:
 581                         return -EINVAL;
 582                 }
 583         }
 584
 585         if (rem > 0)
 586                 return -EINVAL;
 587
 588         return 0;
 589 }
 590
 591 static void clear_stats(struct sw_flow *flow)
 592 {
 593         flow->used = 0;
 594         flow->tcp_flags = 0;
 595         flow->packet_count = 0;
 596         flow->byte_count = 0;
 597 }
 598
 599 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 600 {
 601         struct ovs_header *ovs_header = info->userhdr;
 602         struct nlattr **a = info->attrs;
 603         struct sw_flow_actions *acts;
 604         struct sk_buff *packet;
 605         struct sw_flow *flow;
 606         struct datapath *dp;
 607         struct ethhdr *eth;
 608         int len;
 609         int err;
 610         int key_len;
 611
 612         err = -EINVAL;
 613         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 614             !a[OVS_PACKET_ATTR_ACTIONS] ||
 615             nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN)
 616                 goto err;
 617
 618         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 619         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 620         err = -ENOMEM;
 621         if (!packet)
 622                 goto err;
 623         skb_reserve(packet, NET_IP_ALIGN);
 624
 625         memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len);
 626
 627         skb_reset_mac_header(packet);
 628         eth = eth_hdr(packet);
 629
 630         /* Normally, setting the skb 'protocol' field would be handled by a
 631          * call to eth_type_trans(), but it assumes there's a sending
 632          * device, which we may not have. */
 633         if (ntohs(eth->h_proto) >= 1536)
 634                 packet->protocol = eth->h_proto;
 635         else
 636                 packet->protocol = htons(ETH_P_802_2);
 637
 638         /* Build an sw_flow for sending this packet. */
 639         flow = ovs_flow_alloc();
 640         err = PTR_ERR(flow);
 641         if (IS_ERR(flow))
 642                 goto err_kfree_skb;
 643
 644         err = ovs_flow_extract(packet, -1, &flow->key, &key_len);
 645         if (err)
 646                 goto err_flow_free;
 647
 648         err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority,
 649                                              &flow->key.phy.in_port,
 650                                              a[OVS_PACKET_ATTR_KEY]);
 651         if (err)
 652                 goto err_flow_free;
 653
 654         err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0);
 655         if (err)
 656                 goto err_flow_free;
 657
 658         flow->hash = ovs_flow_hash(&flow->key, key_len);
 659
 660         acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]);
 661         err = PTR_ERR(acts);
 662         if (IS_ERR(acts))
 663                 goto err_flow_free;
 664         rcu_assign_pointer(flow->sf_acts, acts);
 665
 666         OVS_CB(packet)->flow = flow;
 667         packet->priority = flow->key.phy.priority;
 668
 669         rcu_read_lock();
 670         dp = get_dp(ovs_header->dp_ifindex);
 671         err = -ENODEV;
 672         if (!dp)
 673                 goto err_unlock;
 674
 675         local_bh_disable();
 676         err = ovs_execute_actions(dp, packet);
 677         local_bh_enable();
 678         rcu_read_unlock();
 679
 680         ovs_flow_free(flow);
 681         return err;
 682
 683 err_unlock:
 684         rcu_read_unlock();
 685 err_flow_free:
 686         ovs_flow_free(flow);
 687 err_kfree_skb:
 688         kfree_skb(packet);
 689 err:
 690         return err;
 691 }
 692
 693 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 694         [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
 695         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 696         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 697 };
 698
 699 static struct genl_ops dp_packet_genl_ops[] = {
 700         { .cmd = OVS_PACKET_CMD_EXECUTE,
 701           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 702           .policy = packet_policy,
 703           .doit = ovs_packet_cmd_execute
 704         }
 705 };
 706
 707 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
 708 {
 709         int i;
 710         struct flow_table *table = genl_dereference(dp->table);
 711
 712         stats->n_flows = ovs_flow_tbl_count(table);
 713
 714         stats->n_hit = stats->n_missed = stats->n_lost = 0;
 715         for_each_possible_cpu(i) {
 716                 const struct dp_stats_percpu *percpu_stats;
 717                 struct dp_stats_percpu local_stats;
 718                 unsigned int start;
 719
 720                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 721
 722                 do {
 723                         start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
 724                         local_stats = *percpu_stats;
 725                 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
 726
 727                 stats->n_hit += local_stats.n_hit;
 728                 stats->n_missed += local_stats.n_missed;
 729                 stats->n_lost += local_stats.n_lost;
 730         }
 731 }
 732
 733 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
 734         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
 735         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
 736         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
 737 };
 738
 739 static struct genl_family dp_flow_genl_family = {
 740         .id = GENL_ID_GENERATE,
 741         .hdrsize = sizeof(struct ovs_header),
 742         .name = OVS_FLOW_FAMILY,
 743         .version = OVS_FLOW_VERSION,
 744         .maxattr = OVS_FLOW_ATTR_MAX
 745 };
 746
 747 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
 748         .name = OVS_FLOW_MCGROUP
 749 };
 750
 751 /* Called with genl_lock. */
 752 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
 753                                   struct sk_buff *skb, u32 pid,
 754                                   u32 seq, u32 flags, u8 cmd)
 755 {
 756         const int skb_orig_len = skb->len;
 757         const struct sw_flow_actions *sf_acts;
 758         struct ovs_flow_stats stats;
 759         struct ovs_header *ovs_header;
 760         struct nlattr *nla;
 761         unsigned long used;
 762         u8 tcp_flags;
 763         int err;
 764
 765         sf_acts = rcu_dereference_protected(flow->sf_acts,
 766                                             lockdep_genl_is_held());
 767
 768         ovs_header = genlmsg_put(skb, pid, seq, &dp_flow_genl_family, flags, cmd);
 769         if (!ovs_header)
 770                 return -EMSGSIZE;
 771
 772         ovs_header->dp_ifindex = get_dpifindex(dp);
 773
 774         nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
 775         if (!nla)
 776                 goto nla_put_failure;
 777         err = ovs_flow_to_nlattrs(&flow->key, skb);
 778         if (err)
 779                 goto error;
 780         nla_nest_end(skb, nla);
 781
 782         spin_lock_bh(&flow->lock);
 783         used = flow->used;
 784         stats.n_packets = flow->packet_count;
 785         stats.n_bytes = flow->byte_count;
 786         tcp_flags = flow->tcp_flags;
 787         spin_unlock_bh(&flow->lock);
 788
 789         if (used)
 790                 NLA_PUT_U64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used));
 791
 792         if (stats.n_packets)
 793                 NLA_PUT(skb, OVS_FLOW_ATTR_STATS,
 794                         sizeof(struct ovs_flow_stats), &stats);
 795
 796         if (tcp_flags)
 797                 NLA_PUT_U8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags);
 798
 799         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 800          * this is the first flow to be dumped into 'skb'.  This is unusual for
 801          * Netlink but individual action lists can be longer than
 802          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 803          * The userspace caller can always fetch the actions separately if it
 804          * really wants them.  (Most userspace callers in fact don't care.)
 805          *
 806          * This can only fail for dump operations because the skb is always
 807          * properly sized for single flows.
 808          */
 809         err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
 810                       sf_acts->actions);
 811         if (err < 0 && skb_orig_len)
 812                 goto error;
 813
 814         return genlmsg_end(skb, ovs_header);
 815
 816 nla_put_failure:
 817         err = -EMSGSIZE;
 818 error:
 819         genlmsg_cancel(skb, ovs_header);
 820         return err;
 821 }
 822
 823 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
 824 {
 825         const struct sw_flow_actions *sf_acts;
 826         int len;
 827
 828         sf_acts = rcu_dereference_protected(flow->sf_acts,
 829                                             lockdep_genl_is_held());
 830
 831         /* OVS_FLOW_ATTR_KEY */
 832         len = nla_total_size(FLOW_BUFSIZE);
 833         /* OVS_FLOW_ATTR_ACTIONS */
 834         len += nla_total_size(sf_acts->actions_len);
 835         /* OVS_FLOW_ATTR_STATS */
 836         len += nla_total_size(sizeof(struct ovs_flow_stats));
 837         /* OVS_FLOW_ATTR_TCP_FLAGS */
 838         len += nla_total_size(1);
 839         /* OVS_FLOW_ATTR_USED */
 840         len += nla_total_size(8);
 841
 842         len += NLMSG_ALIGN(sizeof(struct ovs_header));
 843
 844         return genlmsg_new(len, GFP_KERNEL);
 845 }
 846
 847 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
 848                                                struct datapath *dp,
 849                                                u32 pid, u32 seq, u8 cmd)
 850 {
 851         struct sk_buff *skb;
 852         int retval;
 853
 854         skb = ovs_flow_cmd_alloc_info(flow);
 855         if (!skb)
 856                 return ERR_PTR(-ENOMEM);
 857
 858         retval = ovs_flow_cmd_fill_info(flow, dp, skb, pid, seq, 0, cmd);
 859         BUG_ON(retval < 0);
 860         return skb;
 861 }
 862
 863 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
 864 {
 865         struct nlattr **a = info->attrs;
 866         struct ovs_header *ovs_header = info->userhdr;
 867         struct sw_flow_key key;
 868         struct sw_flow *flow;
 869         struct sk_buff *reply;
 870         struct datapath *dp;
 871         struct flow_table *table;
 872         int error;
 873         int key_len;
 874
 875         /* Extract key. */
 876         error = -EINVAL;
 877         if (!a[OVS_FLOW_ATTR_KEY])
 878                 goto error;
 879         error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
 880         if (error)
 881                 goto error;
 882
 883         /* Validate actions. */
 884         if (a[OVS_FLOW_ATTR_ACTIONS]) {
 885                 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key,  0);
 886                 if (error)
 887                         goto error;
 888         } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
 889                 error = -EINVAL;
 890                 goto error;
 891         }
 892
 893         dp = get_dp(ovs_header->dp_ifindex);
 894         error = -ENODEV;
 895         if (!dp)
 896                 goto error;
 897
 898         table = genl_dereference(dp->table);
 899         flow = ovs_flow_tbl_lookup(table, &key, key_len);
 900         if (!flow) {
 901                 struct sw_flow_actions *acts;
 902
 903                 /* Bail out if we're not allowed to create a new flow. */
 904                 error = -ENOENT;
 905                 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
 906                         goto error;
 907
 908                 /* Expand table, if necessary, to make room. */
 909                 if (ovs_flow_tbl_need_to_expand(table)) {
 910                         struct flow_table *new_table;
 911
 912                         new_table = ovs_flow_tbl_expand(table);
 913                         if (!IS_ERR(new_table)) {
 914                                 rcu_assign_pointer(dp->table, new_table);
 915                                 ovs_flow_tbl_deferred_destroy(table);
 916                                 table = genl_dereference(dp->table);
 917                         }
 918                 }
 919
 920                 /* Allocate flow. */
 921                 flow = ovs_flow_alloc();
 922                 if (IS_ERR(flow)) {
 923                         error = PTR_ERR(flow);
 924                         goto error;
 925                 }
 926                 flow->key = key;
 927                 clear_stats(flow);
 928
 929                 /* Obtain actions. */
 930                 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
 931                 error = PTR_ERR(acts);
 932                 if (IS_ERR(acts))
 933                         goto error_free_flow;
 934                 rcu_assign_pointer(flow->sf_acts, acts);
 935
 936                 /* Put flow in bucket. */
 937                 flow->hash = ovs_flow_hash(&key, key_len);
 938                 ovs_flow_tbl_insert(table, flow);
 939
 940                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
 941                                                 info->snd_seq,
 942                                                 OVS_FLOW_CMD_NEW);
 943         } else {
 944                 /* We found a matching flow. */
 945                 struct sw_flow_actions *old_acts;
 946                 struct nlattr *acts_attrs;
 947
 948                 /* Bail out if we're not allowed to modify an existing flow.
 949                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
 950                  * because Generic Netlink treats the latter as a dump
 951                  * request.  We also accept NLM_F_EXCL in case that bug ever
 952                  * gets fixed.
 953                  */
 954                 error = -EEXIST;
 955                 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
 956                     info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
 957                         goto error;
 958
 959                 /* Update actions. */
 960                 old_acts = rcu_dereference_protected(flow->sf_acts,
 961                                                      lockdep_genl_is_held());
 962                 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS];
 963                 if (acts_attrs &&
 964                    (old_acts->actions_len != nla_len(acts_attrs) ||
 965                    memcmp(old_acts->actions, nla_data(acts_attrs),
 966                           old_acts->actions_len))) {
 967                         struct sw_flow_actions *new_acts;
 968
 969                         new_acts = ovs_flow_actions_alloc(acts_attrs);
 970                         error = PTR_ERR(new_acts);
 971                         if (IS_ERR(new_acts))
 972                                 goto error;
 973
 974                         rcu_assign_pointer(flow->sf_acts, new_acts);
 975                         ovs_flow_deferred_free_acts(old_acts);
 976                 }
 977
 978                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
 979                                                info->snd_seq, OVS_FLOW_CMD_NEW);
 980
 981                 /* Clear stats. */
 982                 if (a[OVS_FLOW_ATTR_CLEAR]) {
 983                         spin_lock_bh(&flow->lock);
 984                         clear_stats(flow);
 985                         spin_unlock_bh(&flow->lock);
 986                 }
 987         }
 988
 989         if (!IS_ERR(reply))
 990                 genl_notify(reply, genl_info_net(info), info->snd_pid,
 991                            ovs_dp_flow_multicast_group.id, info->nlhdr,
 992                            GFP_KERNEL);
 993         else
 994                 netlink_set_err(init_net.genl_sock, 0,
 995                                 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
 996         return 0;
 997
 998 error_free_flow:
 999         ovs_flow_free(flow);
1000 error:
1001         return error;
1002 }
1003
1004 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1005 {
1006         struct nlattr **a = info->attrs;
1007         struct ovs_header *ovs_header = info->userhdr;
1008         struct sw_flow_key key;
1009         struct sk_buff *reply;
1010         struct sw_flow *flow;
1011         struct datapath *dp;
1012         struct flow_table *table;
1013         int err;
1014         int key_len;
1015
1016         if (!a[OVS_FLOW_ATTR_KEY])
1017                 return -EINVAL;
1018         err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1019         if (err)
1020                 return err;
1021
1022         dp = get_dp(ovs_header->dp_ifindex);
1023         if (!dp)
1024                 return -ENODEV;
1025
1026         table = genl_dereference(dp->table);
1027         flow = ovs_flow_tbl_lookup(table, &key, key_len);
1028         if (!flow)
1029                 return -ENOENT;
1030
1031         reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
1032                                         info->snd_seq, OVS_FLOW_CMD_NEW);
1033         if (IS_ERR(reply))
1034                 return PTR_ERR(reply);
1035
1036         return genlmsg_reply(reply, info);
1037 }
1038
1039 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1040 {
1041         struct nlattr **a = info->attrs;
1042         struct ovs_header *ovs_header = info->userhdr;
1043         struct sw_flow_key key;
1044         struct sk_buff *reply;
1045         struct sw_flow *flow;
1046         struct datapath *dp;
1047         struct flow_table *table;
1048         int err;
1049         int key_len;
1050
1051         if (!a[OVS_FLOW_ATTR_KEY])
1052                 return flush_flows(ovs_header->dp_ifindex);
1053         err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1054         if (err)
1055                 return err;
1056
1057         dp = get_dp(ovs_header->dp_ifindex);
1058         if (!dp)
1059                 return -ENODEV;
1060
1061         table = genl_dereference(dp->table);
1062         flow = ovs_flow_tbl_lookup(table, &key, key_len);
1063         if (!flow)
1064                 return -ENOENT;
1065
1066         reply = ovs_flow_cmd_alloc_info(flow);
1067         if (!reply)
1068                 return -ENOMEM;
1069
1070         ovs_flow_tbl_remove(table, flow);
1071
1072         err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_pid,
1073                                      info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1074         BUG_ON(err < 0);
1075
1076         ovs_flow_deferred_free(flow);
1077
1078         genl_notify(reply, genl_info_net(info), info->snd_pid,
1079                     ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1080         return 0;
1081 }
1082
1083 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1084 {
1085         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1086         struct datapath *dp;
1087         struct flow_table *table;
1088
1089         dp = get_dp(ovs_header->dp_ifindex);
1090         if (!dp)
1091                 return -ENODEV;
1092
1093         table = genl_dereference(dp->table);
1094
1095         for (;;) {
1096                 struct sw_flow *flow;
1097                 u32 bucket, obj;
1098
1099                 bucket = cb->args[0];
1100                 obj = cb->args[1];
1101                 flow = ovs_flow_tbl_next(table, &bucket, &obj);
1102                 if (!flow)
1103                         break;
1104
1105                 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1106                                            NETLINK_CB(cb->skb).pid,
1107                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1108                                            OVS_FLOW_CMD_NEW) < 0)
1109                         break;
1110
1111                 cb->args[0] = bucket;
1112                 cb->args[1] = obj;
1113         }
1114         return skb->len;
1115 }
1116
1117 static struct genl_ops dp_flow_genl_ops[] = {
1118         { .cmd = OVS_FLOW_CMD_NEW,
1119           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1120           .policy = flow_policy,
1121           .doit = ovs_flow_cmd_new_or_set
1122         },
1123         { .cmd = OVS_FLOW_CMD_DEL,
1124           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1125           .policy = flow_policy,
1126           .doit = ovs_flow_cmd_del
1127         },
1128         { .cmd = OVS_FLOW_CMD_GET,
1129           .flags = 0,               /* OK for unprivileged users. */
1130           .policy = flow_policy,
1131           .doit = ovs_flow_cmd_get,
1132           .dumpit = ovs_flow_cmd_dump
1133         },
1134         { .cmd = OVS_FLOW_CMD_SET,
1135           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1136           .policy = flow_policy,
1137           .doit = ovs_flow_cmd_new_or_set,
1138         },
1139 };
1140
1141 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1142         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1143         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1144 };
1145
1146 static struct genl_family dp_datapath_genl_family = {
1147         .id = GENL_ID_GENERATE,
1148         .hdrsize = sizeof(struct ovs_header),
1149         .name = OVS_DATAPATH_FAMILY,
1150         .version = OVS_DATAPATH_VERSION,
1151         .maxattr = OVS_DP_ATTR_MAX
1152 };
1153
1154 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1155         .name = OVS_DATAPATH_MCGROUP
1156 };
1157
1158 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1159                                 u32 pid, u32 seq, u32 flags, u8 cmd)
1160 {
1161         struct ovs_header *ovs_header;
1162         struct ovs_dp_stats dp_stats;
1163         int err;
1164
1165         ovs_header = genlmsg_put(skb, pid, seq, &dp_datapath_genl_family,
1166                                    flags, cmd);
1167         if (!ovs_header)
1168                 goto error;
1169
1170         ovs_header->dp_ifindex = get_dpifindex(dp);
1171
1172         rcu_read_lock();
1173         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1174         rcu_read_unlock();
1175         if (err)
1176                 goto nla_put_failure;
1177
1178         get_dp_stats(dp, &dp_stats);
1179         NLA_PUT(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats);
1180
1181         return genlmsg_end(skb, ovs_header);
1182
1183 nla_put_failure:
1184         genlmsg_cancel(skb, ovs_header);
1185 error:
1186         return -EMSGSIZE;
1187 }
1188
1189 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 pid,
1190                                              u32 seq, u8 cmd)
1191 {
1192         struct sk_buff *skb;
1193         int retval;
1194
1195         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1196         if (!skb)
1197                 return ERR_PTR(-ENOMEM);
1198
1199         retval = ovs_dp_cmd_fill_info(dp, skb, pid, seq, 0, cmd);
1200         if (retval < 0) {
1201                 kfree_skb(skb);
1202                 return ERR_PTR(retval);
1203         }
1204         return skb;
1205 }
1206
1207 /* Called with genl_mutex and optionally with RTNL lock also. */
1208 static struct datapath *lookup_datapath(struct ovs_header *ovs_header,
1209                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1210 {
1211         struct datapath *dp;
1212
1213         if (!a[OVS_DP_ATTR_NAME])
1214                 dp = get_dp(ovs_header->dp_ifindex);
1215         else {
1216                 struct vport *vport;
1217
1218                 rcu_read_lock();
1219                 vport = ovs_vport_locate(nla_data(a[OVS_DP_ATTR_NAME]));
1220                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1221                 rcu_read_unlock();
1222         }
1223         return dp ? dp : ERR_PTR(-ENODEV);
1224 }
1225
1226 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1227 {
1228         struct nlattr **a = info->attrs;
1229         struct vport_parms parms;
1230         struct sk_buff *reply;
1231         struct datapath *dp;
1232         struct vport *vport;
1233         int err;
1234
1235         err = -EINVAL;
1236         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1237                 goto err;
1238
1239         rtnl_lock();
1240         err = -ENODEV;
1241         if (!try_module_get(THIS_MODULE))
1242                 goto err_unlock_rtnl;
1243
1244         err = -ENOMEM;
1245         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1246         if (dp == NULL)
1247                 goto err_put_module;
1248         INIT_LIST_HEAD(&dp->port_list);
1249
1250         /* Allocate table. */
1251         err = -ENOMEM;
1252         rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1253         if (!dp->table)
1254                 goto err_free_dp;
1255
1256         dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1257         if (!dp->stats_percpu) {
1258                 err = -ENOMEM;
1259                 goto err_destroy_table;
1260         }
1261
1262         /* Set up our datapath device. */
1263         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1264         parms.type = OVS_VPORT_TYPE_INTERNAL;
1265         parms.options = NULL;
1266         parms.dp = dp;
1267         parms.port_no = OVSP_LOCAL;
1268         parms.upcall_pid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1269
1270         vport = new_vport(&parms);
1271         if (IS_ERR(vport)) {
1272                 err = PTR_ERR(vport);
1273                 if (err == -EBUSY)
1274                         err = -EEXIST;
1275
1276                 goto err_destroy_percpu;
1277         }
1278
1279         reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1280                                       info->snd_seq, OVS_DP_CMD_NEW);
1281         err = PTR_ERR(reply);
1282         if (IS_ERR(reply))
1283                 goto err_destroy_local_port;
1284
1285         list_add_tail(&dp->list_node, &dps);
1286         rtnl_unlock();
1287
1288         genl_notify(reply, genl_info_net(info), info->snd_pid,
1289                     ovs_dp_datapath_multicast_group.id, info->nlhdr,
1290                     GFP_KERNEL);
1291         return 0;
1292
1293 err_destroy_local_port:
1294         ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL]));
1295 err_destroy_percpu:
1296         free_percpu(dp->stats_percpu);
1297 err_destroy_table:
1298         ovs_flow_tbl_destroy(genl_dereference(dp->table));
1299 err_free_dp:
1300         kfree(dp);
1301 err_put_module:
1302         module_put(THIS_MODULE);
1303 err_unlock_rtnl:
1304         rtnl_unlock();
1305 err:
1306         return err;
1307 }
1308
1309 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1310 {
1311         struct vport *vport, *next_vport;
1312         struct sk_buff *reply;
1313         struct datapath *dp;
1314         int err;
1315
1316         rtnl_lock();
1317         dp = lookup_datapath(info->userhdr, info->attrs);
1318         err = PTR_ERR(dp);
1319         if (IS_ERR(dp))
1320                 goto exit_unlock;
1321
1322         reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1323                                       info->snd_seq, OVS_DP_CMD_DEL);
1324         err = PTR_ERR(reply);
1325         if (IS_ERR(reply))
1326                 goto exit_unlock;
1327
1328         list_for_each_entry_safe(vport, next_vport, &dp->port_list, node)
1329                 if (vport->port_no != OVSP_LOCAL)
1330                         ovs_dp_detach_port(vport);
1331
1332         list_del(&dp->list_node);
1333         ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL]));
1334
1335         /* rtnl_unlock() will wait until all the references to devices that
1336          * are pending unregistration have been dropped.  We do it here to
1337          * ensure that any internal devices (which contain DP pointers) are
1338          * fully destroyed before freeing the datapath.
1339          */
1340         rtnl_unlock();
1341
1342         call_rcu(&dp->rcu, destroy_dp_rcu);
1343         module_put(THIS_MODULE);
1344
1345         genl_notify(reply, genl_info_net(info), info->snd_pid,
1346                     ovs_dp_datapath_multicast_group.id, info->nlhdr,
1347                     GFP_KERNEL);
1348
1349         return 0;
1350
1351 exit_unlock:
1352         rtnl_unlock();
1353         return err;
1354 }
1355
1356 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1357 {
1358         struct sk_buff *reply;
1359         struct datapath *dp;
1360         int err;
1361
1362         dp = lookup_datapath(info->userhdr, info->attrs);
1363         if (IS_ERR(dp))
1364                 return PTR_ERR(dp);
1365
1366         reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1367                                       info->snd_seq, OVS_DP_CMD_NEW);
1368         if (IS_ERR(reply)) {
1369                 err = PTR_ERR(reply);
1370                 netlink_set_err(init_net.genl_sock, 0,
1371                                 ovs_dp_datapath_multicast_group.id, err);
1372                 return 0;
1373         }
1374
1375         genl_notify(reply, genl_info_net(info), info->snd_pid,
1376                     ovs_dp_datapath_multicast_group.id, info->nlhdr,
1377                     GFP_KERNEL);
1378
1379         return 0;
1380 }
1381
1382 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1383 {
1384         struct sk_buff *reply;
1385         struct datapath *dp;
1386
1387         dp = lookup_datapath(info->userhdr, info->attrs);
1388         if (IS_ERR(dp))
1389                 return PTR_ERR(dp);
1390
1391         reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1392                                       info->snd_seq, OVS_DP_CMD_NEW);
1393         if (IS_ERR(reply))
1394                 return PTR_ERR(reply);
1395
1396         return genlmsg_reply(reply, info);
1397 }
1398
1399 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1400 {
1401         struct datapath *dp;
1402         int skip = cb->args[0];
1403         int i = 0;
1404
1405         list_for_each_entry(dp, &dps, list_node) {
1406                 if (i >= skip &&
1407                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid,
1408                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1409                                          OVS_DP_CMD_NEW) < 0)
1410                         break;
1411                 i++;
1412         }
1413
1414         cb->args[0] = i;
1415
1416         return skb->len;
1417 }
1418
1419 static struct genl_ops dp_datapath_genl_ops[] = {
1420         { .cmd = OVS_DP_CMD_NEW,
1421           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1422           .policy = datapath_policy,
1423           .doit = ovs_dp_cmd_new
1424         },
1425         { .cmd = OVS_DP_CMD_DEL,
1426           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1427           .policy = datapath_policy,
1428           .doit = ovs_dp_cmd_del
1429         },
1430         { .cmd = OVS_DP_CMD_GET,
1431           .flags = 0,               /* OK for unprivileged users. */
1432           .policy = datapath_policy,
1433           .doit = ovs_dp_cmd_get,
1434           .dumpit = ovs_dp_cmd_dump
1435         },
1436         { .cmd = OVS_DP_CMD_SET,
1437           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1438           .policy = datapath_policy,
1439           .doit = ovs_dp_cmd_set,
1440         },
1441 };
1442
1443 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1444         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1445         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1446         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1447         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1448         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1449         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1450 };
1451
1452 static struct genl_family dp_vport_genl_family = {
1453         .id = GENL_ID_GENERATE,
1454         .hdrsize = sizeof(struct ovs_header),
1455         .name = OVS_VPORT_FAMILY,
1456         .version = OVS_VPORT_VERSION,
1457         .maxattr = OVS_VPORT_ATTR_MAX
1458 };
1459
1460 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1461         .name = OVS_VPORT_MCGROUP
1462 };
1463
1464 /* Called with RTNL lock or RCU read lock. */
1465 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1466                                    u32 pid, u32 seq, u32 flags, u8 cmd)
1467 {
1468         struct ovs_header *ovs_header;
1469         struct ovs_vport_stats vport_stats;
1470         int err;
1471
1472         ovs_header = genlmsg_put(skb, pid, seq, &dp_vport_genl_family,
1473                                  flags, cmd);
1474         if (!ovs_header)
1475                 return -EMSGSIZE;
1476
1477         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1478
1479         NLA_PUT_U32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no);
1480         NLA_PUT_U32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type);
1481         NLA_PUT_STRING(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport));
1482         NLA_PUT_U32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_pid);
1483
1484         ovs_vport_get_stats(vport, &vport_stats);
1485         NLA_PUT(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1486                 &vport_stats);
1487
1488         err = ovs_vport_get_options(vport, skb);
1489         if (err == -EMSGSIZE)
1490                 goto error;
1491
1492         return genlmsg_end(skb, ovs_header);
1493
1494 nla_put_failure:
1495         err = -EMSGSIZE;
1496 error:
1497         genlmsg_cancel(skb, ovs_header);
1498         return err;
1499 }
1500
1501 /* Called with RTNL lock or RCU read lock. */
1502 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 pid,
1503                                          u32 seq, u8 cmd)
1504 {
1505         struct sk_buff *skb;
1506         int retval;
1507
1508         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1509         if (!skb)
1510                 return ERR_PTR(-ENOMEM);
1511
1512         retval = ovs_vport_cmd_fill_info(vport, skb, pid, seq, 0, cmd);
1513         if (retval < 0) {
1514                 kfree_skb(skb);
1515                 return ERR_PTR(retval);
1516         }
1517         return skb;
1518 }
1519
1520 /* Called with RTNL lock or RCU read lock. */
1521 static struct vport *lookup_vport(struct ovs_header *ovs_header,
1522                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1523 {
1524         struct datapath *dp;
1525         struct vport *vport;
1526
1527         if (a[OVS_VPORT_ATTR_NAME]) {
1528                 vport = ovs_vport_locate(nla_data(a[OVS_VPORT_ATTR_NAME]));
1529                 if (!vport)
1530                         return ERR_PTR(-ENODEV);
1531                 if (ovs_header->dp_ifindex &&
1532                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1533                         return ERR_PTR(-ENODEV);
1534                 return vport;
1535         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1536                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1537
1538                 if (port_no >= DP_MAX_PORTS)
1539                         return ERR_PTR(-EFBIG);
1540
1541                 dp = get_dp(ovs_header->dp_ifindex);
1542                 if (!dp)
1543                         return ERR_PTR(-ENODEV);
1544
1545                 vport = rcu_dereference_rtnl(dp->ports[port_no]);
1546                 if (!vport)
1547                         return ERR_PTR(-ENOENT);
1548                 return vport;
1549         } else
1550                 return ERR_PTR(-EINVAL);
1551 }
1552
1553 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1554 {
1555         struct nlattr **a = info->attrs;
1556         struct ovs_header *ovs_header = info->userhdr;
1557         struct vport_parms parms;
1558         struct sk_buff *reply;
1559         struct vport *vport;
1560         struct datapath *dp;
1561         u32 port_no;
1562         int err;
1563
1564         err = -EINVAL;
1565         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1566             !a[OVS_VPORT_ATTR_UPCALL_PID])
1567                 goto exit;
1568
1569         rtnl_lock();
1570         dp = get_dp(ovs_header->dp_ifindex);
1571         err = -ENODEV;
1572         if (!dp)
1573                 goto exit_unlock;
1574
1575         if (a[OVS_VPORT_ATTR_PORT_NO]) {
1576                 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1577
1578                 err = -EFBIG;
1579                 if (port_no >= DP_MAX_PORTS)
1580                         goto exit_unlock;
1581
1582                 vport = rtnl_dereference(dp->ports[port_no]);
1583                 err = -EBUSY;
1584                 if (vport)
1585                         goto exit_unlock;
1586         } else {
1587                 for (port_no = 1; ; port_no++) {
1588                         if (port_no >= DP_MAX_PORTS) {
1589                                 err = -EFBIG;
1590                                 goto exit_unlock;
1591                         }
1592                         vport = rtnl_dereference(dp->ports[port_no]);
1593                         if (!vport)
1594                                 break;
1595                 }
1596         }
1597
1598         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1599         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1600         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1601         parms.dp = dp;
1602         parms.port_no = port_no;
1603         parms.upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1604
1605         vport = new_vport(&parms);
1606         err = PTR_ERR(vport);
1607         if (IS_ERR(vport))
1608                 goto exit_unlock;
1609
1610         reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1611                                          OVS_VPORT_CMD_NEW);
1612         if (IS_ERR(reply)) {
1613                 err = PTR_ERR(reply);
1614                 ovs_dp_detach_port(vport);
1615                 goto exit_unlock;
1616         }
1617         genl_notify(reply, genl_info_net(info), info->snd_pid,
1618                     ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1619
1620 exit_unlock:
1621         rtnl_unlock();
1622 exit:
1623         return err;
1624 }
1625
1626 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1627 {
1628         struct nlattr **a = info->attrs;
1629         struct sk_buff *reply;
1630         struct vport *vport;
1631         int err;
1632
1633         rtnl_lock();
1634         vport = lookup_vport(info->userhdr, a);
1635         err = PTR_ERR(vport);
1636         if (IS_ERR(vport))
1637                 goto exit_unlock;
1638
1639         err = 0;
1640         if (a[OVS_VPORT_ATTR_TYPE] &&
1641             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type)
1642                 err = -EINVAL;
1643
1644         if (!err && a[OVS_VPORT_ATTR_OPTIONS])
1645                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1646         if (!err && a[OVS_VPORT_ATTR_UPCALL_PID])
1647                 vport->upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1648
1649         reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1650                                          OVS_VPORT_CMD_NEW);
1651         if (IS_ERR(reply)) {
1652                 netlink_set_err(init_net.genl_sock, 0,
1653                                 ovs_dp_vport_multicast_group.id, PTR_ERR(reply));
1654                 goto exit_unlock;
1655         }
1656
1657         genl_notify(reply, genl_info_net(info), info->snd_pid,
1658                     ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1659
1660 exit_unlock:
1661         rtnl_unlock();
1662         return err;
1663 }
1664
1665 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1666 {
1667         struct nlattr **a = info->attrs;
1668         struct sk_buff *reply;
1669         struct vport *vport;
1670         int err;
1671
1672         rtnl_lock();
1673         vport = lookup_vport(info->userhdr, a);
1674         err = PTR_ERR(vport);
1675         if (IS_ERR(vport))
1676                 goto exit_unlock;
1677
1678         if (vport->port_no == OVSP_LOCAL) {
1679                 err = -EINVAL;
1680                 goto exit_unlock;
1681         }
1682
1683         reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1684                                          OVS_VPORT_CMD_DEL);
1685         err = PTR_ERR(reply);
1686         if (IS_ERR(reply))
1687                 goto exit_unlock;
1688
1689         ovs_dp_detach_port(vport);
1690
1691         genl_notify(reply, genl_info_net(info), info->snd_pid,
1692                     ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1693
1694 exit_unlock:
1695         rtnl_unlock();
1696         return err;
1697 }
1698
1699 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1700 {
1701         struct nlattr **a = info->attrs;
1702         struct ovs_header *ovs_header = info->userhdr;
1703         struct sk_buff *reply;
1704         struct vport *vport;
1705         int err;
1706
1707         rcu_read_lock();
1708         vport = lookup_vport(ovs_header, a);
1709         err = PTR_ERR(vport);
1710         if (IS_ERR(vport))
1711                 goto exit_unlock;
1712
1713         reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1714                                          OVS_VPORT_CMD_NEW);
1715         err = PTR_ERR(reply);
1716         if (IS_ERR(reply))
1717                 goto exit_unlock;
1718
1719         rcu_read_unlock();
1720
1721         return genlmsg_reply(reply, info);
1722
1723 exit_unlock:
1724         rcu_read_unlock();
1725         return err;
1726 }
1727
1728 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1729 {
1730         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1731         struct datapath *dp;
1732         u32 port_no;
1733         int retval;
1734
1735         dp = get_dp(ovs_header->dp_ifindex);
1736         if (!dp)
1737                 return -ENODEV;
1738
1739         rcu_read_lock();
1740         for (port_no = cb->args[0]; port_no < DP_MAX_PORTS; port_no++) {
1741                 struct vport *vport;
1742
1743                 vport = rcu_dereference(dp->ports[port_no]);
1744                 if (!vport)
1745                         continue;
1746
1747                 if (ovs_vport_cmd_fill_info(vport, skb, NETLINK_CB(cb->skb).pid,
1748                                             cb->nlh->nlmsg_seq, NLM_F_MULTI,
1749                                             OVS_VPORT_CMD_NEW) < 0)
1750                         break;
1751         }
1752         rcu_read_unlock();
1753
1754         cb->args[0] = port_no;
1755         retval = skb->len;
1756
1757         return retval;
1758 }
1759
1760 static void rehash_flow_table(struct work_struct *work)
1761 {
1762         struct datapath *dp;
1763
1764         genl_lock();
1765
1766         list_for_each_entry(dp, &dps, list_node) {
1767                 struct flow_table *old_table = genl_dereference(dp->table);
1768                 struct flow_table *new_table;
1769
1770                 new_table = ovs_flow_tbl_rehash(old_table);
1771                 if (!IS_ERR(new_table)) {
1772                         rcu_assign_pointer(dp->table, new_table);
1773                         ovs_flow_tbl_deferred_destroy(old_table);
1774                 }
1775         }
1776
1777         genl_unlock();
1778
1779         schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1780 }
1781
1782 static struct genl_ops dp_vport_genl_ops[] = {
1783         { .cmd = OVS_VPORT_CMD_NEW,
1784           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1785           .policy = vport_policy,
1786           .doit = ovs_vport_cmd_new
1787         },
1788         { .cmd = OVS_VPORT_CMD_DEL,
1789           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1790           .policy = vport_policy,
1791           .doit = ovs_vport_cmd_del
1792         },
1793         { .cmd = OVS_VPORT_CMD_GET,
1794           .flags = 0,               /* OK for unprivileged users. */
1795           .policy = vport_policy,
1796           .doit = ovs_vport_cmd_get,
1797           .dumpit = ovs_vport_cmd_dump
1798         },
1799         { .cmd = OVS_VPORT_CMD_SET,
1800           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1801           .policy = vport_policy,
1802           .doit = ovs_vport_cmd_set,
1803         },
1804 };
1805
1806 struct genl_family_and_ops {
1807         struct genl_family *family;
1808         struct genl_ops *ops;
1809         int n_ops;
1810         struct genl_multicast_group *group;
1811 };
1812
1813 static const struct genl_family_and_ops dp_genl_families[] = {
1814         { &dp_datapath_genl_family,
1815           dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1816           &ovs_dp_datapath_multicast_group },
1817         { &dp_vport_genl_family,
1818           dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1819           &ovs_dp_vport_multicast_group },
1820         { &dp_flow_genl_family,
1821           dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1822           &ovs_dp_flow_multicast_group },
1823         { &dp_packet_genl_family,
1824           dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1825           NULL },
1826 };
1827
1828 static void dp_unregister_genl(int n_families)
1829 {
1830         int i;
1831
1832         for (i = 0; i < n_families; i++)
1833                 genl_unregister_family(dp_genl_families[i].family);
1834 }
1835
1836 static int dp_register_genl(void)
1837 {
1838         int n_registered;
1839         int err;
1840         int i;
1841
1842         n_registered = 0;
1843         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1844                 const struct genl_family_and_ops *f = &dp_genl_families[i];
1845
1846                 err = genl_register_family_with_ops(f->family, f->ops,
1847                                                     f->n_ops);
1848                 if (err)
1849                         goto error;
1850                 n_registered++;
1851
1852                 if (f->group) {
1853                         err = genl_register_mc_group(f->family, f->group);
1854                         if (err)
1855                                 goto error;
1856                 }
1857         }
1858
1859         return 0;
1860
1861 error:
1862         dp_unregister_genl(n_registered);
1863         return err;
1864 }
1865
1866 static int __init dp_init(void)
1867 {
1868         struct sk_buff *dummy_skb;
1869         int err;
1870
1871         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
1872
1873         pr_info("Open vSwitch switching datapath\n");
1874
1875         err = ovs_flow_init();
1876         if (err)
1877                 goto error;
1878
1879         err = ovs_vport_init();
1880         if (err)
1881                 goto error_flow_exit;
1882
1883         err = register_netdevice_notifier(&ovs_dp_device_notifier);
1884         if (err)
1885                 goto error_vport_exit;
1886
1887         err = dp_register_genl();
1888         if (err < 0)
1889                 goto error_unreg_notifier;
1890
1891         schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1892
1893         return 0;
1894
1895 error_unreg_notifier:
1896         unregister_netdevice_notifier(&ovs_dp_device_notifier);
1897 error_vport_exit:
1898         ovs_vport_exit();
1899 error_flow_exit:
1900         ovs_flow_exit();
1901 error:
1902         return err;
1903 }
1904
1905 static void dp_cleanup(void)
1906 {
1907         cancel_delayed_work_sync(&rehash_flow_wq);
1908         rcu_barrier();
1909         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
1910         unregister_netdevice_notifier(&ovs_dp_device_notifier);
1911         ovs_vport_exit();
1912         ovs_flow_exit();
1913 }
1914
1915 module_init(dp_init);
1916 module_exit(dp_cleanup);
1917
1918 MODULE_DESCRIPTION("Open vSwitch switching datapath");
1919 MODULE_LICENSE("GPL");