Pileus Git - ~andy/linux/blob - 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 (!nskb)
 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                 goto nla_put_failure;
 792
 793         if (stats.n_packets &&
 794             nla_put(skb, OVS_FLOW_ATTR_STATS,
 795                     sizeof(struct ovs_flow_stats), &stats))
 796                 goto nla_put_failure;
 797
 798         if (tcp_flags &&
 799             nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
 800                 goto nla_put_failure;
 801
 802         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 803          * this is the first flow to be dumped into 'skb'.  This is unusual for
 804          * Netlink but individual action lists can be longer than
 805          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 806          * The userspace caller can always fetch the actions separately if it
 807          * really wants them.  (Most userspace callers in fact don't care.)
 808          *
 809          * This can only fail for dump operations because the skb is always
 810          * properly sized for single flows.
 811          */
 812         err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
 813                       sf_acts->actions);
 814         if (err < 0 && skb_orig_len)
 815                 goto error;
 816
 817         return genlmsg_end(skb, ovs_header);
 818
 819 nla_put_failure:
 820         err = -EMSGSIZE;
 821 error:
 822         genlmsg_cancel(skb, ovs_header);
 823         return err;
 824 }
 825
 826 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
 827 {
 828         const struct sw_flow_actions *sf_acts;
 829         int len;
 830
 831         sf_acts = rcu_dereference_protected(flow->sf_acts,
 832                                             lockdep_genl_is_held());
 833
 834         /* OVS_FLOW_ATTR_KEY */
 835         len = nla_total_size(FLOW_BUFSIZE);
 836         /* OVS_FLOW_ATTR_ACTIONS */
 837         len += nla_total_size(sf_acts->actions_len);
 838         /* OVS_FLOW_ATTR_STATS */
 839         len += nla_total_size(sizeof(struct ovs_flow_stats));
 840         /* OVS_FLOW_ATTR_TCP_FLAGS */
 841         len += nla_total_size(1);
 842         /* OVS_FLOW_ATTR_USED */
 843         len += nla_total_size(8);
 844
 845         len += NLMSG_ALIGN(sizeof(struct ovs_header));
 846
 847         return genlmsg_new(len, GFP_KERNEL);
 848 }
 849
 850 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
 851                                                struct datapath *dp,
 852                                                u32 pid, u32 seq, u8 cmd)
 853 {
 854         struct sk_buff *skb;
 855         int retval;
 856
 857         skb = ovs_flow_cmd_alloc_info(flow);
 858         if (!skb)
 859                 return ERR_PTR(-ENOMEM);
 860
 861         retval = ovs_flow_cmd_fill_info(flow, dp, skb, pid, seq, 0, cmd);
 862         BUG_ON(retval < 0);
 863         return skb;
 864 }
 865
 866 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
 867 {
 868         struct nlattr **a = info->attrs;
 869         struct ovs_header *ovs_header = info->userhdr;
 870         struct sw_flow_key key;
 871         struct sw_flow *flow;
 872         struct sk_buff *reply;
 873         struct datapath *dp;
 874         struct flow_table *table;
 875         int error;
 876         int key_len;
 877
 878         /* Extract key. */
 879         error = -EINVAL;
 880         if (!a[OVS_FLOW_ATTR_KEY])
 881                 goto error;
 882         error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
 883         if (error)
 884                 goto error;
 885
 886         /* Validate actions. */
 887         if (a[OVS_FLOW_ATTR_ACTIONS]) {
 888                 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key,  0);
 889                 if (error)
 890                         goto error;
 891         } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
 892                 error = -EINVAL;
 893                 goto error;
 894         }
 895
 896         dp = get_dp(ovs_header->dp_ifindex);
 897         error = -ENODEV;
 898         if (!dp)
 899                 goto error;
 900
 901         table = genl_dereference(dp->table);
 902         flow = ovs_flow_tbl_lookup(table, &key, key_len);
 903         if (!flow) {
 904                 struct sw_flow_actions *acts;
 905
 906                 /* Bail out if we're not allowed to create a new flow. */
 907                 error = -ENOENT;
 908                 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
 909                         goto error;
 910
 911                 /* Expand table, if necessary, to make room. */
 912                 if (ovs_flow_tbl_need_to_expand(table)) {
 913                         struct flow_table *new_table;
 914
 915                         new_table = ovs_flow_tbl_expand(table);
 916                         if (!IS_ERR(new_table)) {
 917                                 rcu_assign_pointer(dp->table, new_table);
 918                                 ovs_flow_tbl_deferred_destroy(table);
 919                                 table = genl_dereference(dp->table);
 920                         }
 921                 }
 922
 923                 /* Allocate flow. */
 924                 flow = ovs_flow_alloc();
 925                 if (IS_ERR(flow)) {
 926                         error = PTR_ERR(flow);
 927                         goto error;
 928                 }
 929                 flow->key = key;
 930                 clear_stats(flow);
 931
 932                 /* Obtain actions. */
 933                 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
 934                 error = PTR_ERR(acts);
 935                 if (IS_ERR(acts))
 936                         goto error_free_flow;
 937                 rcu_assign_pointer(flow->sf_acts, acts);
 938
 939                 /* Put flow in bucket. */
 940                 flow->hash = ovs_flow_hash(&key, key_len);
 941                 ovs_flow_tbl_insert(table, flow);
 942
 943                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
 944                                                 info->snd_seq,
 945                                                 OVS_FLOW_CMD_NEW);
 946         } else {
 947                 /* We found a matching flow. */
 948                 struct sw_flow_actions *old_acts;
 949                 struct nlattr *acts_attrs;
 950
 951                 /* Bail out if we're not allowed to modify an existing flow.
 952                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
 953                  * because Generic Netlink treats the latter as a dump
 954                  * request.  We also accept NLM_F_EXCL in case that bug ever
 955                  * gets fixed.
 956                  */
 957                 error = -EEXIST;
 958                 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
 959                     info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
 960                         goto error;
 961
 962                 /* Update actions. */
 963                 old_acts = rcu_dereference_protected(flow->sf_acts,
 964                                                      lockdep_genl_is_held());
 965                 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS];
 966                 if (acts_attrs &&
 967                    (old_acts->actions_len != nla_len(acts_attrs) ||
 968                    memcmp(old_acts->actions, nla_data(acts_attrs),
 969                           old_acts->actions_len))) {
 970                         struct sw_flow_actions *new_acts;
 971
 972                         new_acts = ovs_flow_actions_alloc(acts_attrs);
 973                         error = PTR_ERR(new_acts);
 974                         if (IS_ERR(new_acts))
 975                                 goto error;
 976
 977                         rcu_assign_pointer(flow->sf_acts, new_acts);
 978                         ovs_flow_deferred_free_acts(old_acts);
 979                 }
 980
 981                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
 982                                                info->snd_seq, OVS_FLOW_CMD_NEW);
 983
 984                 /* Clear stats. */
 985                 if (a[OVS_FLOW_ATTR_CLEAR]) {
 986                         spin_lock_bh(&flow->lock);
 987                         clear_stats(flow);
 988                         spin_unlock_bh(&flow->lock);
 989                 }
 990         }
 991
 992         if (!IS_ERR(reply))
 993                 genl_notify(reply, genl_info_net(info), info->snd_pid,
 994                            ovs_dp_flow_multicast_group.id, info->nlhdr,
 995                            GFP_KERNEL);
 996         else
 997                 netlink_set_err(init_net.genl_sock, 0,
 998                                 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
 999         return 0;
1000
1001 error_free_flow:
1002         ovs_flow_free(flow);
1003 error:
1004         return error;
1005 }
1006
1007 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1008 {
1009         struct nlattr **a = info->attrs;
1010         struct ovs_header *ovs_header = info->userhdr;
1011         struct sw_flow_key key;
1012         struct sk_buff *reply;
1013         struct sw_flow *flow;
1014         struct datapath *dp;
1015         struct flow_table *table;
1016         int err;
1017         int key_len;
1018
1019         if (!a[OVS_FLOW_ATTR_KEY])
1020                 return -EINVAL;
1021         err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1022         if (err)
1023                 return err;
1024
1025         dp = get_dp(ovs_header->dp_ifindex);
1026         if (!dp)
1027                 return -ENODEV;
1028
1029         table = genl_dereference(dp->table);
1030         flow = ovs_flow_tbl_lookup(table, &key, key_len);
1031         if (!flow)
1032                 return -ENOENT;
1033
1034         reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
1035                                         info->snd_seq, OVS_FLOW_CMD_NEW);
1036         if (IS_ERR(reply))
1037                 return PTR_ERR(reply);
1038
1039         return genlmsg_reply(reply, info);
1040 }
1041
1042 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1043 {
1044         struct nlattr **a = info->attrs;
1045         struct ovs_header *ovs_header = info->userhdr;
1046         struct sw_flow_key key;
1047         struct sk_buff *reply;
1048         struct sw_flow *flow;
1049         struct datapath *dp;
1050         struct flow_table *table;
1051         int err;
1052         int key_len;
1053
1054         if (!a[OVS_FLOW_ATTR_KEY])
1055                 return flush_flows(ovs_header->dp_ifindex);
1056         err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1057         if (err)
1058                 return err;
1059
1060         dp = get_dp(ovs_header->dp_ifindex);
1061         if (!dp)
1062                 return -ENODEV;
1063
1064         table = genl_dereference(dp->table);
1065         flow = ovs_flow_tbl_lookup(table, &key, key_len);
1066         if (!flow)
1067                 return -ENOENT;
1068
1069         reply = ovs_flow_cmd_alloc_info(flow);
1070         if (!reply)
1071                 return -ENOMEM;
1072
1073         ovs_flow_tbl_remove(table, flow);
1074
1075         err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_pid,
1076                                      info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1077         BUG_ON(err < 0);
1078
1079         ovs_flow_deferred_free(flow);
1080
1081         genl_notify(reply, genl_info_net(info), info->snd_pid,
1082                     ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1083         return 0;
1084 }
1085
1086 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1087 {
1088         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1089         struct datapath *dp;
1090         struct flow_table *table;
1091
1092         dp = get_dp(ovs_header->dp_ifindex);
1093         if (!dp)
1094                 return -ENODEV;
1095
1096         table = genl_dereference(dp->table);
1097
1098         for (;;) {
1099                 struct sw_flow *flow;
1100                 u32 bucket, obj;
1101
1102                 bucket = cb->args[0];
1103                 obj = cb->args[1];
1104                 flow = ovs_flow_tbl_next(table, &bucket, &obj);
1105                 if (!flow)
1106                         break;
1107
1108                 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1109                                            NETLINK_CB(cb->skb).pid,
1110                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1111                                            OVS_FLOW_CMD_NEW) < 0)
1112                         break;
1113
1114                 cb->args[0] = bucket;
1115                 cb->args[1] = obj;
1116         }
1117         return skb->len;
1118 }
1119
1120 static struct genl_ops dp_flow_genl_ops[] = {
1121         { .cmd = OVS_FLOW_CMD_NEW,
1122           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1123           .policy = flow_policy,
1124           .doit = ovs_flow_cmd_new_or_set
1125         },
1126         { .cmd = OVS_FLOW_CMD_DEL,
1127           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1128           .policy = flow_policy,
1129           .doit = ovs_flow_cmd_del
1130         },
1131         { .cmd = OVS_FLOW_CMD_GET,
1132           .flags = 0,               /* OK for unprivileged users. */
1133           .policy = flow_policy,
1134           .doit = ovs_flow_cmd_get,
1135           .dumpit = ovs_flow_cmd_dump
1136         },
1137         { .cmd = OVS_FLOW_CMD_SET,
1138           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1139           .policy = flow_policy,
1140           .doit = ovs_flow_cmd_new_or_set,
1141         },
1142 };
1143
1144 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1145         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1146         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1147 };
1148
1149 static struct genl_family dp_datapath_genl_family = {
1150         .id = GENL_ID_GENERATE,
1151         .hdrsize = sizeof(struct ovs_header),
1152         .name = OVS_DATAPATH_FAMILY,
1153         .version = OVS_DATAPATH_VERSION,
1154         .maxattr = OVS_DP_ATTR_MAX
1155 };
1156
1157 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1158         .name = OVS_DATAPATH_MCGROUP
1159 };
1160
1161 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1162                                 u32 pid, u32 seq, u32 flags, u8 cmd)
1163 {
1164         struct ovs_header *ovs_header;
1165         struct ovs_dp_stats dp_stats;
1166         int err;
1167
1168         ovs_header = genlmsg_put(skb, pid, seq, &dp_datapath_genl_family,
1169                                    flags, cmd);
1170         if (!ovs_header)
1171                 goto error;
1172
1173         ovs_header->dp_ifindex = get_dpifindex(dp);
1174
1175         rcu_read_lock();
1176         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1177         rcu_read_unlock();
1178         if (err)
1179                 goto nla_put_failure;
1180
1181         get_dp_stats(dp, &dp_stats);
1182         if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
1183                 goto nla_put_failure;
1184
1185         return genlmsg_end(skb, ovs_header);
1186
1187 nla_put_failure:
1188         genlmsg_cancel(skb, ovs_header);
1189 error:
1190         return -EMSGSIZE;
1191 }
1192
1193 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 pid,
1194                                              u32 seq, u8 cmd)
1195 {
1196         struct sk_buff *skb;
1197         int retval;
1198
1199         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1200         if (!skb)
1201                 return ERR_PTR(-ENOMEM);
1202
1203         retval = ovs_dp_cmd_fill_info(dp, skb, pid, seq, 0, cmd);
1204         if (retval < 0) {
1205                 kfree_skb(skb);
1206                 return ERR_PTR(retval);
1207         }
1208         return skb;
1209 }
1210
1211 /* Called with genl_mutex and optionally with RTNL lock also. */
1212 static struct datapath *lookup_datapath(struct ovs_header *ovs_header,
1213                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1214 {
1215         struct datapath *dp;
1216
1217         if (!a[OVS_DP_ATTR_NAME])
1218                 dp = get_dp(ovs_header->dp_ifindex);
1219         else {
1220                 struct vport *vport;
1221
1222                 rcu_read_lock();
1223                 vport = ovs_vport_locate(nla_data(a[OVS_DP_ATTR_NAME]));
1224                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1225                 rcu_read_unlock();
1226         }
1227         return dp ? dp : ERR_PTR(-ENODEV);
1228 }
1229
1230 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1231 {
1232         struct nlattr **a = info->attrs;
1233         struct vport_parms parms;
1234         struct sk_buff *reply;
1235         struct datapath *dp;
1236         struct vport *vport;
1237         int err;
1238
1239         err = -EINVAL;
1240         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1241                 goto err;
1242
1243         rtnl_lock();
1244         err = -ENODEV;
1245         if (!try_module_get(THIS_MODULE))
1246                 goto err_unlock_rtnl;
1247
1248         err = -ENOMEM;
1249         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1250         if (dp == NULL)
1251                 goto err_put_module;
1252         INIT_LIST_HEAD(&dp->port_list);
1253
1254         /* Allocate table. */
1255         err = -ENOMEM;
1256         rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1257         if (!dp->table)
1258                 goto err_free_dp;
1259
1260         dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1261         if (!dp->stats_percpu) {
1262                 err = -ENOMEM;
1263                 goto err_destroy_table;
1264         }
1265
1266         /* Set up our datapath device. */
1267         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1268         parms.type = OVS_VPORT_TYPE_INTERNAL;
1269         parms.options = NULL;
1270         parms.dp = dp;
1271         parms.port_no = OVSP_LOCAL;
1272         parms.upcall_pid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1273
1274         vport = new_vport(&parms);
1275         if (IS_ERR(vport)) {
1276                 err = PTR_ERR(vport);
1277                 if (err == -EBUSY)
1278                         err = -EEXIST;
1279
1280                 goto err_destroy_percpu;
1281         }
1282
1283         reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1284                                       info->snd_seq, OVS_DP_CMD_NEW);
1285         err = PTR_ERR(reply);
1286         if (IS_ERR(reply))
1287                 goto err_destroy_local_port;
1288
1289         list_add_tail(&dp->list_node, &dps);
1290         rtnl_unlock();
1291
1292         genl_notify(reply, genl_info_net(info), info->snd_pid,
1293                     ovs_dp_datapath_multicast_group.id, info->nlhdr,
1294                     GFP_KERNEL);
1295         return 0;
1296
1297 err_destroy_local_port:
1298         ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL]));
1299 err_destroy_percpu:
1300         free_percpu(dp->stats_percpu);
1301 err_destroy_table:
1302         ovs_flow_tbl_destroy(genl_dereference(dp->table));
1303 err_free_dp:
1304         kfree(dp);
1305 err_put_module:
1306         module_put(THIS_MODULE);
1307 err_unlock_rtnl:
1308         rtnl_unlock();
1309 err:
1310         return err;
1311 }
1312
1313 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1314 {
1315         struct vport *vport, *next_vport;
1316         struct sk_buff *reply;
1317         struct datapath *dp;
1318         int err;
1319
1320         rtnl_lock();
1321         dp = lookup_datapath(info->userhdr, info->attrs);
1322         err = PTR_ERR(dp);
1323         if (IS_ERR(dp))
1324                 goto exit_unlock;
1325
1326         reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1327                                       info->snd_seq, OVS_DP_CMD_DEL);
1328         err = PTR_ERR(reply);
1329         if (IS_ERR(reply))
1330                 goto exit_unlock;
1331
1332         list_for_each_entry_safe(vport, next_vport, &dp->port_list, node)
1333                 if (vport->port_no != OVSP_LOCAL)
1334                         ovs_dp_detach_port(vport);
1335
1336         list_del(&dp->list_node);
1337         ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL]));
1338
1339         /* rtnl_unlock() will wait until all the references to devices that
1340          * are pending unregistration have been dropped.  We do it here to
1341          * ensure that any internal devices (which contain DP pointers) are
1342          * fully destroyed before freeing the datapath.
1343          */
1344         rtnl_unlock();
1345
1346         call_rcu(&dp->rcu, destroy_dp_rcu);
1347         module_put(THIS_MODULE);
1348
1349         genl_notify(reply, genl_info_net(info), info->snd_pid,
1350                     ovs_dp_datapath_multicast_group.id, info->nlhdr,
1351                     GFP_KERNEL);
1352
1353         return 0;
1354
1355 exit_unlock:
1356         rtnl_unlock();
1357         return err;
1358 }
1359
1360 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1361 {
1362         struct sk_buff *reply;
1363         struct datapath *dp;
1364         int err;
1365
1366         dp = lookup_datapath(info->userhdr, info->attrs);
1367         if (IS_ERR(dp))
1368                 return PTR_ERR(dp);
1369
1370         reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1371                                       info->snd_seq, OVS_DP_CMD_NEW);
1372         if (IS_ERR(reply)) {
1373                 err = PTR_ERR(reply);
1374                 netlink_set_err(init_net.genl_sock, 0,
1375                                 ovs_dp_datapath_multicast_group.id, err);
1376                 return 0;
1377         }
1378
1379         genl_notify(reply, genl_info_net(info), info->snd_pid,
1380                     ovs_dp_datapath_multicast_group.id, info->nlhdr,
1381                     GFP_KERNEL);
1382
1383         return 0;
1384 }
1385
1386 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1387 {
1388         struct sk_buff *reply;
1389         struct datapath *dp;
1390
1391         dp = lookup_datapath(info->userhdr, info->attrs);
1392         if (IS_ERR(dp))
1393                 return PTR_ERR(dp);
1394
1395         reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1396                                       info->snd_seq, OVS_DP_CMD_NEW);
1397         if (IS_ERR(reply))
1398                 return PTR_ERR(reply);
1399
1400         return genlmsg_reply(reply, info);
1401 }
1402
1403 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1404 {
1405         struct datapath *dp;
1406         int skip = cb->args[0];
1407         int i = 0;
1408
1409         list_for_each_entry(dp, &dps, list_node) {
1410                 if (i >= skip &&
1411                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid,
1412                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1413                                          OVS_DP_CMD_NEW) < 0)
1414                         break;
1415                 i++;
1416         }
1417
1418         cb->args[0] = i;
1419
1420         return skb->len;
1421 }
1422
1423 static struct genl_ops dp_datapath_genl_ops[] = {
1424         { .cmd = OVS_DP_CMD_NEW,
1425           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1426           .policy = datapath_policy,
1427           .doit = ovs_dp_cmd_new
1428         },
1429         { .cmd = OVS_DP_CMD_DEL,
1430           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1431           .policy = datapath_policy,
1432           .doit = ovs_dp_cmd_del
1433         },
1434         { .cmd = OVS_DP_CMD_GET,
1435           .flags = 0,               /* OK for unprivileged users. */
1436           .policy = datapath_policy,
1437           .doit = ovs_dp_cmd_get,
1438           .dumpit = ovs_dp_cmd_dump
1439         },
1440         { .cmd = OVS_DP_CMD_SET,
1441           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1442           .policy = datapath_policy,
1443           .doit = ovs_dp_cmd_set,
1444         },
1445 };
1446
1447 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1448         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1449         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1450         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1451         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1452         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1453         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1454 };
1455
1456 static struct genl_family dp_vport_genl_family = {
1457         .id = GENL_ID_GENERATE,
1458         .hdrsize = sizeof(struct ovs_header),
1459         .name = OVS_VPORT_FAMILY,
1460         .version = OVS_VPORT_VERSION,
1461         .maxattr = OVS_VPORT_ATTR_MAX
1462 };
1463
1464 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1465         .name = OVS_VPORT_MCGROUP
1466 };
1467
1468 /* Called with RTNL lock or RCU read lock. */
1469 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1470                                    u32 pid, u32 seq, u32 flags, u8 cmd)
1471 {
1472         struct ovs_header *ovs_header;
1473         struct ovs_vport_stats vport_stats;
1474         int err;
1475
1476         ovs_header = genlmsg_put(skb, pid, seq, &dp_vport_genl_family,
1477                                  flags, cmd);
1478         if (!ovs_header)
1479                 return -EMSGSIZE;
1480
1481         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1482
1483         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1484             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1485             nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1486             nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_pid))
1487                 goto nla_put_failure;
1488
1489         ovs_vport_get_stats(vport, &vport_stats);
1490         if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1491                     &vport_stats))
1492                 goto nla_put_failure;
1493
1494         err = ovs_vport_get_options(vport, skb);
1495         if (err == -EMSGSIZE)
1496                 goto error;
1497
1498         return genlmsg_end(skb, ovs_header);
1499
1500 nla_put_failure:
1501         err = -EMSGSIZE;
1502 error:
1503         genlmsg_cancel(skb, ovs_header);
1504         return err;
1505 }
1506
1507 /* Called with RTNL lock or RCU read lock. */
1508 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 pid,
1509                                          u32 seq, u8 cmd)
1510 {
1511         struct sk_buff *skb;
1512         int retval;
1513
1514         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1515         if (!skb)
1516                 return ERR_PTR(-ENOMEM);
1517
1518         retval = ovs_vport_cmd_fill_info(vport, skb, pid, seq, 0, cmd);
1519         if (retval < 0) {
1520                 kfree_skb(skb);
1521                 return ERR_PTR(retval);
1522         }
1523         return skb;
1524 }
1525
1526 /* Called with RTNL lock or RCU read lock. */
1527 static struct vport *lookup_vport(struct ovs_header *ovs_header,
1528                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1529 {
1530         struct datapath *dp;
1531         struct vport *vport;
1532
1533         if (a[OVS_VPORT_ATTR_NAME]) {
1534                 vport = ovs_vport_locate(nla_data(a[OVS_VPORT_ATTR_NAME]));
1535                 if (!vport)
1536                         return ERR_PTR(-ENODEV);
1537                 if (ovs_header->dp_ifindex &&
1538                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1539                         return ERR_PTR(-ENODEV);
1540                 return vport;
1541         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1542                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1543
1544                 if (port_no >= DP_MAX_PORTS)
1545                         return ERR_PTR(-EFBIG);
1546
1547                 dp = get_dp(ovs_header->dp_ifindex);
1548                 if (!dp)
1549                         return ERR_PTR(-ENODEV);
1550
1551                 vport = rcu_dereference_rtnl(dp->ports[port_no]);
1552                 if (!vport)
1553                         return ERR_PTR(-ENOENT);
1554                 return vport;
1555         } else
1556                 return ERR_PTR(-EINVAL);
1557 }
1558
1559 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1560 {
1561         struct nlattr **a = info->attrs;
1562         struct ovs_header *ovs_header = info->userhdr;
1563         struct vport_parms parms;
1564         struct sk_buff *reply;
1565         struct vport *vport;
1566         struct datapath *dp;
1567         u32 port_no;
1568         int err;
1569
1570         err = -EINVAL;
1571         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1572             !a[OVS_VPORT_ATTR_UPCALL_PID])
1573                 goto exit;
1574
1575         rtnl_lock();
1576         dp = get_dp(ovs_header->dp_ifindex);
1577         err = -ENODEV;
1578         if (!dp)
1579                 goto exit_unlock;
1580
1581         if (a[OVS_VPORT_ATTR_PORT_NO]) {
1582                 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1583
1584                 err = -EFBIG;
1585                 if (port_no >= DP_MAX_PORTS)
1586                         goto exit_unlock;
1587
1588                 vport = rtnl_dereference(dp->ports[port_no]);
1589                 err = -EBUSY;
1590                 if (vport)
1591                         goto exit_unlock;
1592         } else {
1593                 for (port_no = 1; ; port_no++) {
1594                         if (port_no >= DP_MAX_PORTS) {
1595                                 err = -EFBIG;
1596                                 goto exit_unlock;
1597                         }
1598                         vport = rtnl_dereference(dp->ports[port_no]);
1599                         if (!vport)
1600                                 break;
1601                 }
1602         }
1603
1604         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1605         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1606         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1607         parms.dp = dp;
1608         parms.port_no = port_no;
1609         parms.upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1610
1611         vport = new_vport(&parms);
1612         err = PTR_ERR(vport);
1613         if (IS_ERR(vport))
1614                 goto exit_unlock;
1615
1616         reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1617                                          OVS_VPORT_CMD_NEW);
1618         if (IS_ERR(reply)) {
1619                 err = PTR_ERR(reply);
1620                 ovs_dp_detach_port(vport);
1621                 goto exit_unlock;
1622         }
1623         genl_notify(reply, genl_info_net(info), info->snd_pid,
1624                     ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1625
1626 exit_unlock:
1627         rtnl_unlock();
1628 exit:
1629         return err;
1630 }
1631
1632 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1633 {
1634         struct nlattr **a = info->attrs;
1635         struct sk_buff *reply;
1636         struct vport *vport;
1637         int err;
1638
1639         rtnl_lock();
1640         vport = lookup_vport(info->userhdr, a);
1641         err = PTR_ERR(vport);
1642         if (IS_ERR(vport))
1643                 goto exit_unlock;
1644
1645         err = 0;
1646         if (a[OVS_VPORT_ATTR_TYPE] &&
1647             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type)
1648                 err = -EINVAL;
1649
1650         if (!err && a[OVS_VPORT_ATTR_OPTIONS])
1651                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1652         if (!err && a[OVS_VPORT_ATTR_UPCALL_PID])
1653                 vport->upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1654
1655         reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1656                                          OVS_VPORT_CMD_NEW);
1657         if (IS_ERR(reply)) {
1658                 netlink_set_err(init_net.genl_sock, 0,
1659                                 ovs_dp_vport_multicast_group.id, PTR_ERR(reply));
1660                 goto exit_unlock;
1661         }
1662
1663         genl_notify(reply, genl_info_net(info), info->snd_pid,
1664                     ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1665
1666 exit_unlock:
1667         rtnl_unlock();
1668         return err;
1669 }
1670
1671 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1672 {
1673         struct nlattr **a = info->attrs;
1674         struct sk_buff *reply;
1675         struct vport *vport;
1676         int err;
1677
1678         rtnl_lock();
1679         vport = lookup_vport(info->userhdr, a);
1680         err = PTR_ERR(vport);
1681         if (IS_ERR(vport))
1682                 goto exit_unlock;
1683
1684         if (vport->port_no == OVSP_LOCAL) {
1685                 err = -EINVAL;
1686                 goto exit_unlock;
1687         }
1688
1689         reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1690                                          OVS_VPORT_CMD_DEL);
1691         err = PTR_ERR(reply);
1692         if (IS_ERR(reply))
1693                 goto exit_unlock;
1694
1695         ovs_dp_detach_port(vport);
1696
1697         genl_notify(reply, genl_info_net(info), info->snd_pid,
1698                     ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1699
1700 exit_unlock:
1701         rtnl_unlock();
1702         return err;
1703 }
1704
1705 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1706 {
1707         struct nlattr **a = info->attrs;
1708         struct ovs_header *ovs_header = info->userhdr;
1709         struct sk_buff *reply;
1710         struct vport *vport;
1711         int err;
1712
1713         rcu_read_lock();
1714         vport = lookup_vport(ovs_header, a);
1715         err = PTR_ERR(vport);
1716         if (IS_ERR(vport))
1717                 goto exit_unlock;
1718
1719         reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1720                                          OVS_VPORT_CMD_NEW);
1721         err = PTR_ERR(reply);
1722         if (IS_ERR(reply))
1723                 goto exit_unlock;
1724
1725         rcu_read_unlock();
1726
1727         return genlmsg_reply(reply, info);
1728
1729 exit_unlock:
1730         rcu_read_unlock();
1731         return err;
1732 }
1733
1734 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1735 {
1736         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1737         struct datapath *dp;
1738         u32 port_no;
1739         int retval;
1740
1741         dp = get_dp(ovs_header->dp_ifindex);
1742         if (!dp)
1743                 return -ENODEV;
1744
1745         rcu_read_lock();
1746         for (port_no = cb->args[0]; port_no < DP_MAX_PORTS; port_no++) {
1747                 struct vport *vport;
1748
1749                 vport = rcu_dereference(dp->ports[port_no]);
1750                 if (!vport)
1751                         continue;
1752
1753                 if (ovs_vport_cmd_fill_info(vport, skb, NETLINK_CB(cb->skb).pid,
1754                                             cb->nlh->nlmsg_seq, NLM_F_MULTI,
1755                                             OVS_VPORT_CMD_NEW) < 0)
1756                         break;
1757         }
1758         rcu_read_unlock();
1759
1760         cb->args[0] = port_no;
1761         retval = skb->len;
1762
1763         return retval;
1764 }
1765
1766 static void rehash_flow_table(struct work_struct *work)
1767 {
1768         struct datapath *dp;
1769
1770         genl_lock();
1771
1772         list_for_each_entry(dp, &dps, list_node) {
1773                 struct flow_table *old_table = genl_dereference(dp->table);
1774                 struct flow_table *new_table;
1775
1776                 new_table = ovs_flow_tbl_rehash(old_table);
1777                 if (!IS_ERR(new_table)) {
1778                         rcu_assign_pointer(dp->table, new_table);
1779                         ovs_flow_tbl_deferred_destroy(old_table);
1780                 }
1781         }
1782
1783         genl_unlock();
1784
1785         schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1786 }
1787
1788 static struct genl_ops dp_vport_genl_ops[] = {
1789         { .cmd = OVS_VPORT_CMD_NEW,
1790           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1791           .policy = vport_policy,
1792           .doit = ovs_vport_cmd_new
1793         },
1794         { .cmd = OVS_VPORT_CMD_DEL,
1795           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1796           .policy = vport_policy,
1797           .doit = ovs_vport_cmd_del
1798         },
1799         { .cmd = OVS_VPORT_CMD_GET,
1800           .flags = 0,               /* OK for unprivileged users. */
1801           .policy = vport_policy,
1802           .doit = ovs_vport_cmd_get,
1803           .dumpit = ovs_vport_cmd_dump
1804         },
1805         { .cmd = OVS_VPORT_CMD_SET,
1806           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1807           .policy = vport_policy,
1808           .doit = ovs_vport_cmd_set,
1809         },
1810 };
1811
1812 struct genl_family_and_ops {
1813         struct genl_family *family;
1814         struct genl_ops *ops;
1815         int n_ops;
1816         struct genl_multicast_group *group;
1817 };
1818
1819 static const struct genl_family_and_ops dp_genl_families[] = {
1820         { &dp_datapath_genl_family,
1821           dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1822           &ovs_dp_datapath_multicast_group },
1823         { &dp_vport_genl_family,
1824           dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1825           &ovs_dp_vport_multicast_group },
1826         { &dp_flow_genl_family,
1827           dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1828           &ovs_dp_flow_multicast_group },
1829         { &dp_packet_genl_family,
1830           dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1831           NULL },
1832 };
1833
1834 static void dp_unregister_genl(int n_families)
1835 {
1836         int i;
1837
1838         for (i = 0; i < n_families; i++)
1839                 genl_unregister_family(dp_genl_families[i].family);
1840 }
1841
1842 static int dp_register_genl(void)
1843 {
1844         int n_registered;
1845         int err;
1846         int i;
1847
1848         n_registered = 0;
1849         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1850                 const struct genl_family_and_ops *f = &dp_genl_families[i];
1851
1852                 err = genl_register_family_with_ops(f->family, f->ops,
1853                                                     f->n_ops);
1854                 if (err)
1855                         goto error;
1856                 n_registered++;
1857
1858                 if (f->group) {
1859                         err = genl_register_mc_group(f->family, f->group);
1860                         if (err)
1861                                 goto error;
1862                 }
1863         }
1864
1865         return 0;
1866
1867 error:
1868         dp_unregister_genl(n_registered);
1869         return err;
1870 }
1871
1872 static int __init dp_init(void)
1873 {
1874         struct sk_buff *dummy_skb;
1875         int err;
1876
1877         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
1878
1879         pr_info("Open vSwitch switching datapath\n");
1880
1881         err = ovs_flow_init();
1882         if (err)
1883                 goto error;
1884
1885         err = ovs_vport_init();
1886         if (err)
1887                 goto error_flow_exit;
1888
1889         err = register_netdevice_notifier(&ovs_dp_device_notifier);
1890         if (err)
1891                 goto error_vport_exit;
1892
1893         err = dp_register_genl();
1894         if (err < 0)
1895                 goto error_unreg_notifier;
1896
1897         schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1898
1899         return 0;
1900
1901 error_unreg_notifier:
1902         unregister_netdevice_notifier(&ovs_dp_device_notifier);
1903 error_vport_exit:
1904         ovs_vport_exit();
1905 error_flow_exit:
1906         ovs_flow_exit();
1907 error:
1908         return err;
1909 }
1910
1911 static void dp_cleanup(void)
1912 {
1913         cancel_delayed_work_sync(&rehash_flow_wq);
1914         rcu_barrier();
1915         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
1916         unregister_netdevice_notifier(&ovs_dp_device_notifier);
1917         ovs_vport_exit();
1918         ovs_flow_exit();
1919 }
1920
1921 module_init(dp_init);
1922 module_exit(dp_cleanup);
1923
1924 MODULE_DESCRIPTION("Open vSwitch switching datapath");
1925 MODULE_LICENSE("GPL");