datapath/datapath.c

   1 /*
   2  * Copyright (c) 2007-2013 Nicira, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of version 2 of the GNU General Public
   6  * License as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  16  * 02110-1301, USA
  17  */
  18
  19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  20
  21 #include <linux/init.h>
  22 #include <linux/module.h>
  23 #include <linux/if_arp.h>
  24 #include <linux/if_vlan.h>
  25 #include <linux/in.h>
  26 #include <linux/ip.h>
  27 #include <linux/jhash.h>
  28 #include <linux/delay.h>
  29 #include <linux/time.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/genetlink.h>
  32 #include <linux/kernel.h>
  33 #include <linux/kthread.h>
  34 #include <linux/mutex.h>
  35 #include <linux/percpu.h>
  36 #include <linux/rcupdate.h>
  37 #include <linux/tcp.h>
  38 #include <linux/udp.h>
  39 #include <linux/version.h>
  40 #include <linux/ethtool.h>
  41 #include <linux/wait.h>
  42 #include <asm/div64.h>
  43 #include <linux/highmem.h>
  44 #include <linux/netfilter_bridge.h>
  45 #include <linux/netfilter_ipv4.h>
  46 #include <linux/inetdevice.h>
  47 #include <linux/list.h>
  48 #include <linux/openvswitch.h>
  49 #include <linux/rculist.h>
  50 #include <linux/dmi.h>
  51 #include <linux/genetlink.h>
  52 #include <net/genetlink.h>
  53 #include <net/genetlink.h>
  54 #include <net/net_namespace.h>
  55 #include <net/netns/generic.h>
  56
  57 #include "datapath.h"
  58 #include "flow.h"
  59 #include "flow_netlink.h"
  60 #include "vlan.h"
  61 #include "vport-internal_dev.h"
  62 #include "vport-netdev.h"
  63
  64 int ovs_net_id __read_mostly;
  65
  66 static void ovs_notify(struct sk_buff *skb, struct genl_info *info,
  67                        struct genl_multicast_group *grp)
  68 {
  69         genl_notify(skb, genl_info_net(info), info->snd_portid,
  70                     grp->id, info->nlhdr, GFP_KERNEL);
  71 }
  72
  73 /**
  74  * DOC: Locking:
  75  *
  76  * All writes e.g. Writes to device state (add/remove datapath, port, set
  77  * operations on vports, etc.), Writes to other state (flow table
  78  * modifications, set miscellaneous datapath parameters, etc.) are protected
  79  * by ovs_lock.
  80  *
  81  * Reads are protected by RCU.
  82  *
  83  * There are a few special cases (mostly stats) that have their own
  84  * synchronization but they nest under all of above and don't interact with
  85  * each other.
  86  *
  87  * The RTNL lock nests inside ovs_mutex.
  88  */
  89
  90 static DEFINE_MUTEX(ovs_mutex);
  91
  92 void ovs_lock(void)
  93 {
  94         mutex_lock(&ovs_mutex);
  95 }
  96
  97 void ovs_unlock(void)
  98 {
  99         mutex_unlock(&ovs_mutex);
 100 }
 101
 102 #ifdef CONFIG_LOCKDEP
 103 int lockdep_ovsl_is_held(void)
 104 {
 105         if (debug_locks)
 106                 return lockdep_is_held(&ovs_mutex);
 107         else
 108                 return 1;
 109 }
 110 #endif
 111
 112 static struct vport *new_vport(const struct vport_parms *);
 113 static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *,
 114                              const struct dp_upcall_info *);
 115 static int queue_userspace_packet(struct net *, int dp_ifindex,
 116                                   struct sk_buff *,
 117                                   const struct dp_upcall_info *);
 118
 119 /* Must be called with rcu_read_lock or ovs_mutex. */
 120 static struct datapath *get_dp(struct net *net, int dp_ifindex)
 121 {
 122         struct datapath *dp = NULL;
 123         struct net_device *dev;
 124
 125         rcu_read_lock();
 126         dev = dev_get_by_index_rcu(net, dp_ifindex);
 127         if (dev) {
 128                 struct vport *vport = ovs_internal_dev_get_vport(dev);
 129                 if (vport)
 130                         dp = vport->dp;
 131         }
 132         rcu_read_unlock();
 133
 134         return dp;
 135 }
 136
 137 /* Must be called with rcu_read_lock or ovs_mutex. */
 138 const char *ovs_dp_name(const struct datapath *dp)
 139 {
 140         struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
 141         return vport->ops->get_name(vport);
 142 }
 143
 144 static int get_dpifindex(struct datapath *dp)
 145 {
 146         struct vport *local;
 147         int ifindex;
 148
 149         rcu_read_lock();
 150
 151         local = ovs_vport_rcu(dp, OVSP_LOCAL);
 152         if (local)
 153                 ifindex = netdev_vport_priv(local)->dev->ifindex;
 154         else
 155                 ifindex = 0;
 156
 157         rcu_read_unlock();
 158
 159         return ifindex;
 160 }
 161
 162 static void destroy_dp_rcu(struct rcu_head *rcu)
 163 {
 164         struct datapath *dp = container_of(rcu, struct datapath, rcu);
 165
 166         ovs_flow_tbl_destroy(&dp->table);
 167         free_percpu(dp->stats_percpu);
 168         release_net(ovs_dp_get_net(dp));
 169         kfree(dp->ports);
 170         kfree(dp);
 171 }
 172
 173 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
 174                                             u16 port_no)
 175 {
 176         return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
 177 }
 178
 179 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
 180 {
 181         struct vport *vport;
 182         struct hlist_head *head;
 183
 184         head = vport_hash_bucket(dp, port_no);
 185         hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
 186                 if (vport->port_no == port_no)
 187                         return vport;
 188         }
 189         return NULL;
 190 }
 191
 192 /* Called with ovs_mutex. */
 193 static struct vport *new_vport(const struct vport_parms *parms)
 194 {
 195         struct vport *vport;
 196
 197         vport = ovs_vport_add(parms);
 198         if (!IS_ERR(vport)) {
 199                 struct datapath *dp = parms->dp;
 200                 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
 201
 202                 hlist_add_head_rcu(&vport->dp_hash_node, head);
 203         }
 204         return vport;
 205 }
 206
 207 void ovs_dp_detach_port(struct vport *p)
 208 {
 209         ASSERT_OVSL();
 210
 211         /* First drop references to device. */
 212         hlist_del_rcu(&p->dp_hash_node);
 213
 214         /* Then destroy it. */
 215         ovs_vport_del(p);
 216 }
 217
 218 /* Must be called with rcu_read_lock. */
 219 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
 220 {
 221         struct datapath *dp = p->dp;
 222         struct sw_flow *flow;
 223         struct dp_stats_percpu *stats;
 224         struct sw_flow_key key;
 225         u64 *stats_counter;
 226         u32 n_mask_hit;
 227         int error;
 228
 229         stats = this_cpu_ptr(dp->stats_percpu);
 230
 231         /* Extract flow from 'skb' into 'key'. */
 232         error = ovs_flow_extract(skb, p->port_no, &key);
 233         if (unlikely(error)) {
 234                 kfree_skb(skb);
 235                 return;
 236         }
 237
 238         /* Look up flow. */
 239         flow = ovs_flow_tbl_lookup_stats(&dp->table, &key, &n_mask_hit);
 240         if (unlikely(!flow)) {
 241                 struct dp_upcall_info upcall;
 242
 243                 upcall.cmd = OVS_PACKET_CMD_MISS;
 244                 upcall.key = &key;
 245                 upcall.userdata = NULL;
 246                 upcall.portid = p->upcall_portid;
 247                 ovs_dp_upcall(dp, skb, &upcall);
 248                 consume_skb(skb);
 249                 stats_counter = &stats->n_missed;
 250                 goto out;
 251         }
 252
 253         OVS_CB(skb)->flow = flow;
 254         OVS_CB(skb)->pkt_key = &key;
 255
 256         ovs_flow_stats_update(OVS_CB(skb)->flow, skb);
 257         ovs_execute_actions(dp, skb);
 258         stats_counter = &stats->n_hit;
 259
 260 out:
 261         /* Update datapath statistics. */
 262         u64_stats_update_begin(&stats->sync);
 263         (*stats_counter)++;
 264         stats->n_mask_hit += n_mask_hit;
 265         u64_stats_update_end(&stats->sync);
 266 }
 267
 268 static struct genl_family dp_packet_genl_family = {
 269         .id = GENL_ID_GENERATE,
 270         .hdrsize = sizeof(struct ovs_header),
 271         .name = OVS_PACKET_FAMILY,
 272         .version = OVS_PACKET_VERSION,
 273         .maxattr = OVS_PACKET_ATTR_MAX,
 274         .netnsok = true,
 275          SET_PARALLEL_OPS
 276 };
 277
 278 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
 279                   const struct dp_upcall_info *upcall_info)
 280 {
 281         struct dp_stats_percpu *stats;
 282         int dp_ifindex;
 283         int err;
 284
 285         if (upcall_info->portid == 0) {
 286                 err = -ENOTCONN;
 287                 goto err;
 288         }
 289
 290         dp_ifindex = get_dpifindex(dp);
 291         if (!dp_ifindex) {
 292                 err = -ENODEV;
 293                 goto err;
 294         }
 295
 296         if (!skb_is_gso(skb))
 297                 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
 298         else
 299                 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
 300         if (err)
 301                 goto err;
 302
 303         return 0;
 304
 305 err:
 306         stats = this_cpu_ptr(dp->stats_percpu);
 307
 308         u64_stats_update_begin(&stats->sync);
 309         stats->n_lost++;
 310         u64_stats_update_end(&stats->sync);
 311
 312         return err;
 313 }
 314
 315 static int queue_gso_packets(struct net *net, int dp_ifindex,
 316                              struct sk_buff *skb,
 317                              const struct dp_upcall_info *upcall_info)
 318 {
 319         unsigned short gso_type = skb_shinfo(skb)->gso_type;
 320         struct dp_upcall_info later_info;
 321         struct sw_flow_key later_key;
 322         struct sk_buff *segs, *nskb;
 323         int err;
 324
 325         segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false);
 326         if (IS_ERR(segs))
 327                 return PTR_ERR(segs);
 328
 329         /* Queue all of the segments. */
 330         skb = segs;
 331         do {
 332                 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
 333                 if (err)
 334                         break;
 335
 336                 if (skb == segs && gso_type & SKB_GSO_UDP) {
 337                         /* The initial flow key extracted by ovs_flow_extract()
 338                          * in this case is for a first fragment, so we need to
 339                          * properly mark later fragments.
 340                          */
 341                         later_key = *upcall_info->key;
 342                         later_key.ip.frag = OVS_FRAG_TYPE_LATER;
 343
 344                         later_info = *upcall_info;
 345                         later_info.key = &later_key;
 346                         upcall_info = &later_info;
 347                 }
 348         } while ((skb = skb->next));
 349
 350         /* Free all of the segments. */
 351         skb = segs;
 352         do {
 353                 nskb = skb->next;
 354                 if (err)
 355                         kfree_skb(skb);
 356                 else
 357                         consume_skb(skb);
 358         } while ((skb = nskb));
 359         return err;
 360 }
 361
 362 static size_t key_attr_size(void)
 363 {
 364         return    nla_total_size(4)   /* OVS_KEY_ATTR_PRIORITY */
 365                 + nla_total_size(0)   /* OVS_KEY_ATTR_TUNNEL */
 366                   + nla_total_size(8)   /* OVS_TUNNEL_KEY_ATTR_ID */
 367                   + nla_total_size(4)   /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
 368                   + nla_total_size(4)   /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
 369                   + nla_total_size(1)   /* OVS_TUNNEL_KEY_ATTR_TOS */
 370                   + nla_total_size(1)   /* OVS_TUNNEL_KEY_ATTR_TTL */
 371                   + nla_total_size(0)   /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
 372                   + nla_total_size(0)   /* OVS_TUNNEL_KEY_ATTR_CSUM */
 373                 + nla_total_size(4)   /* OVS_KEY_ATTR_IN_PORT */
 374                 + nla_total_size(4)   /* OVS_KEY_ATTR_SKB_MARK */
 375                 + nla_total_size(12)  /* OVS_KEY_ATTR_ETHERNET */
 376                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 377                 + nla_total_size(4)   /* OVS_KEY_ATTR_8021Q */
 378                 + nla_total_size(0)   /* OVS_KEY_ATTR_ENCAP */
 379                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 380                 + nla_total_size(40)  /* OVS_KEY_ATTR_IPV6 */
 381                 + nla_total_size(2)   /* OVS_KEY_ATTR_ICMPV6 */
 382                 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
 383 }
 384
 385 static size_t upcall_msg_size(const struct sk_buff *skb,
 386                               const struct nlattr *userdata)
 387 {
 388         size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
 389                 + nla_total_size(skb->len) /* OVS_PACKET_ATTR_PACKET */
 390                 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
 391
 392         /* OVS_PACKET_ATTR_USERDATA */
 393         if (userdata)
 394                 size += NLA_ALIGN(userdata->nla_len);
 395
 396         return size;
 397 }
 398
 399 static int queue_userspace_packet(struct net *net, int dp_ifindex,
 400                                   struct sk_buff *skb,
 401                                   const struct dp_upcall_info *upcall_info)
 402 {
 403         struct ovs_header *upcall;
 404         struct sk_buff *nskb = NULL;
 405         struct sk_buff *user_skb; /* to be queued to userspace */
 406         struct nlattr *nla;
 407         int err;
 408
 409         if (vlan_tx_tag_present(skb)) {
 410                 nskb = skb_clone(skb, GFP_ATOMIC);
 411                 if (!nskb)
 412                         return -ENOMEM;
 413
 414                 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb));
 415                 if (!nskb)
 416                         return -ENOMEM;
 417
 418                 vlan_set_tci(nskb, 0);
 419
 420                 skb = nskb;
 421         }
 422
 423         if (nla_attr_size(skb->len) > USHRT_MAX) {
 424                 err = -EFBIG;
 425                 goto out;
 426         }
 427
 428         user_skb = genlmsg_new(upcall_msg_size(skb, upcall_info->userdata), GFP_ATOMIC);
 429         if (!user_skb) {
 430                 err = -ENOMEM;
 431                 goto out;
 432         }
 433
 434         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
 435                              0, upcall_info->cmd);
 436         upcall->dp_ifindex = dp_ifindex;
 437
 438         nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
 439         ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb);
 440         nla_nest_end(user_skb, nla);
 441
 442         if (upcall_info->userdata)
 443                 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
 444                           nla_len(upcall_info->userdata),
 445                           nla_data(upcall_info->userdata));
 446
 447         nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
 448
 449         skb_copy_and_csum_dev(skb, nla_data(nla));
 450
 451         genlmsg_end(user_skb, upcall);
 452         err = genlmsg_unicast(net, user_skb, upcall_info->portid);
 453
 454 out:
 455         kfree_skb(nskb);
 456         return err;
 457 }
 458
 459 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 460 {
 461         struct ovs_header *ovs_header = info->userhdr;
 462         struct nlattr **a = info->attrs;
 463         struct sw_flow_actions *acts;
 464         struct sk_buff *packet;
 465         struct sw_flow *flow;
 466         struct datapath *dp;
 467         struct ethhdr *eth;
 468         int len;
 469         int err;
 470
 471         err = -EINVAL;
 472         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 473             !a[OVS_PACKET_ATTR_ACTIONS])
 474                 goto err;
 475
 476         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 477         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 478         err = -ENOMEM;
 479         if (!packet)
 480                 goto err;
 481         skb_reserve(packet, NET_IP_ALIGN);
 482
 483         nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
 484
 485         skb_reset_mac_header(packet);
 486         eth = eth_hdr(packet);
 487
 488         /* Normally, setting the skb 'protocol' field would be handled by a
 489          * call to eth_type_trans(), but it assumes there's a sending
 490          * device, which we may not have. */
 491         if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
 492                 packet->protocol = eth->h_proto;
 493         else
 494                 packet->protocol = htons(ETH_P_802_2);
 495
 496         /* Build an sw_flow for sending this packet. */
 497         flow = ovs_flow_alloc();
 498         err = PTR_ERR(flow);
 499         if (IS_ERR(flow))
 500                 goto err_kfree_skb;
 501
 502         err = ovs_flow_extract(packet, -1, &flow->key);
 503         if (err)
 504                 goto err_flow_free;
 505
 506         err = ovs_nla_get_flow_metadata(flow, a[OVS_PACKET_ATTR_KEY]);
 507         if (err)
 508                 goto err_flow_free;
 509         acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
 510         err = PTR_ERR(acts);
 511         if (IS_ERR(acts))
 512                 goto err_flow_free;
 513
 514         err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
 515                                    &flow->key, 0, &acts);
 516         rcu_assign_pointer(flow->sf_acts, acts);
 517         if (err)
 518                 goto err_flow_free;
 519
 520         OVS_CB(packet)->flow = flow;
 521         OVS_CB(packet)->pkt_key = &flow->key;
 522         packet->priority = flow->key.phy.priority;
 523         packet->mark = flow->key.phy.skb_mark;
 524
 525         rcu_read_lock();
 526         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 527         err = -ENODEV;
 528         if (!dp)
 529                 goto err_unlock;
 530
 531         local_bh_disable();
 532         err = ovs_execute_actions(dp, packet);
 533         local_bh_enable();
 534         rcu_read_unlock();
 535
 536         ovs_flow_free(flow, false);
 537         return err;
 538
 539 err_unlock:
 540         rcu_read_unlock();
 541 err_flow_free:
 542         ovs_flow_free(flow, false);
 543 err_kfree_skb:
 544         kfree_skb(packet);
 545 err:
 546         return err;
 547 }
 548
 549 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 550         [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
 551         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 552         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 553 };
 554
 555 static struct genl_ops dp_packet_genl_ops[] = {
 556         { .cmd = OVS_PACKET_CMD_EXECUTE,
 557           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 558           .policy = packet_policy,
 559           .doit = ovs_packet_cmd_execute
 560         }
 561 };
 562
 563 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats,
 564                          struct ovs_dp_megaflow_stats *mega_stats)
 565 {
 566         int i;
 567
 568         memset(mega_stats, 0, sizeof(*mega_stats));
 569
 570         stats->n_flows = ovs_flow_tbl_count(&dp->table);
 571         mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
 572
 573         stats->n_hit = stats->n_missed = stats->n_lost = 0;
 574
 575         for_each_possible_cpu(i) {
 576                 const struct dp_stats_percpu *percpu_stats;
 577                 struct dp_stats_percpu local_stats;
 578                 unsigned int start;
 579
 580                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 581
 582                 do {
 583                         start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
 584                         local_stats = *percpu_stats;
 585                 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
 586
 587                 stats->n_hit += local_stats.n_hit;
 588                 stats->n_missed += local_stats.n_missed;
 589                 stats->n_lost += local_stats.n_lost;
 590                 mega_stats->n_mask_hit += local_stats.n_mask_hit;
 591         }
 592 }
 593
 594 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
 595         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
 596         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
 597         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
 598 };
 599
 600 static struct genl_family dp_flow_genl_family = {
 601         .id = GENL_ID_GENERATE,
 602         .hdrsize = sizeof(struct ovs_header),
 603         .name = OVS_FLOW_FAMILY,
 604         .version = OVS_FLOW_VERSION,
 605         .maxattr = OVS_FLOW_ATTR_MAX,
 606         .netnsok = true,
 607          SET_PARALLEL_OPS
 608 };
 609
 610 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
 611         .name = OVS_FLOW_MCGROUP
 612 };
 613
 614 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
 615 {
 616         return NLMSG_ALIGN(sizeof(struct ovs_header))
 617                 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
 618                 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
 619                 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
 620                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
 621                 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
 622                 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
 623 }
 624
 625 /* Called with ovs_mutex. */
 626 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
 627                                   struct sk_buff *skb, u32 portid,
 628                                   u32 seq, u32 flags, u8 cmd)
 629 {
 630         const int skb_orig_len = skb->len;
 631         struct nlattr *start;
 632         struct sw_flow_stats flow_stats;
 633         struct ovs_header *ovs_header;
 634         struct nlattr *nla;
 635         int err;
 636
 637         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
 638         if (!ovs_header)
 639                 return -EMSGSIZE;
 640
 641         ovs_header->dp_ifindex = get_dpifindex(dp);
 642
 643         /* Fill flow key. */
 644         nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
 645         if (!nla)
 646                 goto nla_put_failure;
 647
 648         err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb);
 649         if (err)
 650                 goto error;
 651         nla_nest_end(skb, nla);
 652
 653         nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
 654         if (!nla)
 655                 goto nla_put_failure;
 656
 657         err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb);
 658         if (err)
 659                 goto error;
 660
 661         nla_nest_end(skb, nla);
 662
 663         ovs_flow_stats_get(flow, &flow_stats);
 664         if (flow_stats.used &&
 665             nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(flow_stats.used)))
 666                 goto nla_put_failure;
 667
 668         if (flow_stats.packet_count) {
 669                 struct ovs_flow_stats stats = {
 670                         .n_packets = flow_stats.packet_count,
 671                         .n_bytes = flow_stats.byte_count,
 672                 };
 673
 674                 if (nla_put(skb, OVS_FLOW_ATTR_STATS,
 675                             sizeof(struct ovs_flow_stats), &stats))
 676                         goto nla_put_failure;
 677         }
 678
 679         if ((u8)ntohs(flow_stats.tcp_flags) &&
 680             nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS,
 681                        (u8)ntohs(flow_stats.tcp_flags)))
 682                 goto nla_put_failure;
 683
 684         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 685          * this is the first flow to be dumped into 'skb'.  This is unusual for
 686          * Netlink but individual action lists can be longer than
 687          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 688          * The userspace caller can always fetch the actions separately if it
 689          * really wants them.  (Most userspace callers in fact don't care.)
 690          *
 691          * This can only fail for dump operations because the skb is always
 692          * properly sized for single flows.
 693          */
 694         start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
 695         if (start) {
 696                 const struct sw_flow_actions *sf_acts;
 697
 698                 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
 699
 700                 err = ovs_nla_put_actions(sf_acts->actions,
 701                                           sf_acts->actions_len, skb);
 702                 if (!err)
 703                         nla_nest_end(skb, start);
 704                 else {
 705                         if (skb_orig_len)
 706                                 goto error;
 707
 708                         nla_nest_cancel(skb, start);
 709                 }
 710         } else if (skb_orig_len)
 711                 goto nla_put_failure;
 712
 713         return genlmsg_end(skb, ovs_header);
 714
 715 nla_put_failure:
 716         err = -EMSGSIZE;
 717 error:
 718         genlmsg_cancel(skb, ovs_header);
 719         return err;
 720 }
 721
 722 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
 723 {
 724         const struct sw_flow_actions *sf_acts;
 725
 726         sf_acts = ovsl_dereference(flow->sf_acts);
 727
 728         return genlmsg_new(ovs_flow_cmd_msg_size(sf_acts), GFP_KERNEL);
 729 }
 730
 731 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
 732                                                struct datapath *dp,
 733                                                u32 portid, u32 seq, u8 cmd)
 734 {
 735         struct sk_buff *skb;
 736         int retval;
 737
 738         skb = ovs_flow_cmd_alloc_info(flow);
 739         if (!skb)
 740                 return ERR_PTR(-ENOMEM);
 741
 742         retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
 743         BUG_ON(retval < 0);
 744         return skb;
 745 }
 746
 747 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
 748 {
 749         struct nlattr **a = info->attrs;
 750         struct ovs_header *ovs_header = info->userhdr;
 751         struct sw_flow_key key, masked_key;
 752         struct sw_flow *flow = NULL;
 753         struct sw_flow_mask mask;
 754         struct sk_buff *reply;
 755         struct datapath *dp;
 756         struct sw_flow_actions *acts = NULL;
 757         struct sw_flow_match match;
 758         int error;
 759
 760         /* Extract key. */
 761         error = -EINVAL;
 762         if (!a[OVS_FLOW_ATTR_KEY])
 763                 goto error;
 764
 765         ovs_match_init(&match, &key, &mask);
 766         error = ovs_nla_get_match(&match,
 767                                   a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
 768         if (error)
 769                 goto error;
 770
 771         /* Validate actions. */
 772         if (a[OVS_FLOW_ATTR_ACTIONS]) {
 773                 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
 774                 error = PTR_ERR(acts);
 775                 if (IS_ERR(acts))
 776                         goto error;
 777
 778                 ovs_flow_mask_key(&masked_key, &key, &mask);
 779                 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS],
 780                                              &masked_key, 0, &acts);
 781                 if (error) {
 782                         OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
 783                         goto err_kfree;
 784                 }
 785         } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
 786                 error = -EINVAL;
 787                 goto error;
 788         }
 789
 790         ovs_lock();
 791         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 792         error = -ENODEV;
 793         if (!dp)
 794                 goto err_unlock_ovs;
 795
 796         /* Check if this is a duplicate flow */
 797         flow = ovs_flow_tbl_lookup(&dp->table, &key);
 798         if (!flow) {
 799                 /* Bail out if we're not allowed to create a new flow. */
 800                 error = -ENOENT;
 801                 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
 802                         goto err_unlock_ovs;
 803
 804                 /* Allocate flow. */
 805                 flow = ovs_flow_alloc();
 806                 if (IS_ERR(flow)) {
 807                         error = PTR_ERR(flow);
 808                         goto err_unlock_ovs;
 809                 }
 810
 811                 flow->key = masked_key;
 812                 flow->unmasked_key = key;
 813                 rcu_assign_pointer(flow->sf_acts, acts);
 814
 815                 /* Put flow in bucket. */
 816                 error = ovs_flow_tbl_insert(&dp->table, flow, &mask);
 817                 if (error) {
 818                         acts = NULL;
 819                         goto err_flow_free;
 820                 }
 821
 822                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
 823                                                 info->snd_seq, OVS_FLOW_CMD_NEW);
 824         } else {
 825                 /* We found a matching flow. */
 826                 struct sw_flow_actions *old_acts;
 827
 828                 /* Bail out if we're not allowed to modify an existing flow.
 829                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
 830                  * because Generic Netlink treats the latter as a dump
 831                  * request.  We also accept NLM_F_EXCL in case that bug ever
 832                  * gets fixed.
 833                  */
 834                 error = -EEXIST;
 835                 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
 836                     info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
 837                         goto err_unlock_ovs;
 838
 839                 /* The unmasked key has to be the same for flow updates. */
 840                 error = -EINVAL;
 841                 if (!ovs_flow_cmp_unmasked_key(flow, &match)) {
 842                         OVS_NLERR("Flow modification message rejected, unmasked key does not match.\n");
 843                         goto err_unlock_ovs;
 844                 }
 845
 846                 /* Update actions. */
 847                 old_acts = ovsl_dereference(flow->sf_acts);
 848                 rcu_assign_pointer(flow->sf_acts, acts);
 849                 ovs_nla_free_flow_actions(old_acts);
 850
 851                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
 852                                                info->snd_seq, OVS_FLOW_CMD_NEW);
 853
 854                 /* Clear stats. */
 855                 if (a[OVS_FLOW_ATTR_CLEAR])
 856                         ovs_flow_stats_clear(flow);
 857         }
 858         ovs_unlock();
 859
 860         if (!IS_ERR(reply))
 861                 ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
 862         else
 863                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
 864                                 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
 865         return 0;
 866
 867 err_flow_free:
 868         ovs_flow_free(flow, false);
 869 err_unlock_ovs:
 870         ovs_unlock();
 871 err_kfree:
 872         kfree(acts);
 873 error:
 874         return error;
 875 }
 876
 877 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
 878 {
 879         struct nlattr **a = info->attrs;
 880         struct ovs_header *ovs_header = info->userhdr;
 881         struct sw_flow_key key;
 882         struct sk_buff *reply;
 883         struct sw_flow *flow;
 884         struct datapath *dp;
 885         struct sw_flow_match match;
 886         int err;
 887
 888         if (!a[OVS_FLOW_ATTR_KEY]) {
 889                 OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
 890                 return -EINVAL;
 891         }
 892
 893         ovs_match_init(&match, &key, NULL);
 894         err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
 895         if (err)
 896                 return err;
 897
 898         ovs_lock();
 899         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 900         if (!dp) {
 901                 err = -ENODEV;
 902                 goto unlock;
 903         }
 904
 905         flow = ovs_flow_tbl_lookup(&dp->table, &key);
 906         if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) {
 907                 err = -ENOENT;
 908                 goto unlock;
 909         }
 910
 911         reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
 912                                         info->snd_seq, OVS_FLOW_CMD_NEW);
 913         if (IS_ERR(reply)) {
 914                 err = PTR_ERR(reply);
 915                 goto unlock;
 916         }
 917
 918         ovs_unlock();
 919         return genlmsg_reply(reply, info);
 920 unlock:
 921         ovs_unlock();
 922         return err;
 923 }
 924
 925 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
 926 {
 927         struct nlattr **a = info->attrs;
 928         struct ovs_header *ovs_header = info->userhdr;
 929         struct sw_flow_key key;
 930         struct sk_buff *reply;
 931         struct sw_flow *flow;
 932         struct datapath *dp;
 933         struct sw_flow_match match;
 934         int err;
 935
 936         ovs_lock();
 937         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 938         if (!dp) {
 939                 err = -ENODEV;
 940                 goto unlock;
 941         }
 942
 943         if (!a[OVS_FLOW_ATTR_KEY]) {
 944                 err = ovs_flow_tbl_flush(&dp->table);
 945                 goto unlock;
 946         }
 947
 948         ovs_match_init(&match, &key, NULL);
 949         err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
 950         if (err)
 951                 goto unlock;
 952
 953         flow = ovs_flow_tbl_lookup(&dp->table, &key);
 954         if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) {
 955                 err = -ENOENT;
 956                 goto unlock;
 957         }
 958
 959         reply = ovs_flow_cmd_alloc_info(flow);
 960         if (!reply) {
 961                 err = -ENOMEM;
 962                 goto unlock;
 963         }
 964
 965         ovs_flow_tbl_remove(&dp->table, flow);
 966
 967         err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
 968                                      info->snd_seq, 0, OVS_FLOW_CMD_DEL);
 969         BUG_ON(err < 0);
 970
 971         ovs_flow_free(flow, true);
 972         ovs_unlock();
 973
 974         ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
 975         return 0;
 976 unlock:
 977         ovs_unlock();
 978         return err;
 979 }
 980
 981 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
 982 {
 983         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
 984         struct table_instance *ti;
 985         struct datapath *dp;
 986
 987         rcu_read_lock();
 988         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 989         if (!dp) {
 990                 rcu_read_unlock();
 991                 return -ENODEV;
 992         }
 993
 994         ti = rcu_dereference(dp->table.ti);
 995         for (;;) {
 996                 struct sw_flow *flow;
 997                 u32 bucket, obj;
 998
 999                 bucket = cb->args[0];
1000                 obj = cb->args[1];
1001                 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1002                 if (!flow)
1003                         break;
1004
1005                 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1006                                            NETLINK_CB(cb->skb).portid,
1007                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1008                                            OVS_FLOW_CMD_NEW) < 0)
1009                         break;
1010
1011                 cb->args[0] = bucket;
1012                 cb->args[1] = obj;
1013         }
1014         rcu_read_unlock();
1015         return skb->len;
1016 }
1017
1018 static struct genl_ops dp_flow_genl_ops[] = {
1019         { .cmd = OVS_FLOW_CMD_NEW,
1020           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1021           .policy = flow_policy,
1022           .doit = ovs_flow_cmd_new_or_set
1023         },
1024         { .cmd = OVS_FLOW_CMD_DEL,
1025           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1026           .policy = flow_policy,
1027           .doit = ovs_flow_cmd_del
1028         },
1029         { .cmd = OVS_FLOW_CMD_GET,
1030           .flags = 0,               /* OK for unprivileged users. */
1031           .policy = flow_policy,
1032           .doit = ovs_flow_cmd_get,
1033           .dumpit = ovs_flow_cmd_dump
1034         },
1035         { .cmd = OVS_FLOW_CMD_SET,
1036           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1037           .policy = flow_policy,
1038           .doit = ovs_flow_cmd_new_or_set,
1039         },
1040 };
1041
1042 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1043         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1044         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1045 };
1046
1047 static struct genl_family dp_datapath_genl_family = {
1048         .id = GENL_ID_GENERATE,
1049         .hdrsize = sizeof(struct ovs_header),
1050         .name = OVS_DATAPATH_FAMILY,
1051         .version = OVS_DATAPATH_VERSION,
1052         .maxattr = OVS_DP_ATTR_MAX,
1053         .netnsok = true,
1054          SET_PARALLEL_OPS
1055 };
1056
1057 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1058         .name = OVS_DATAPATH_MCGROUP
1059 };
1060
1061 static size_t ovs_dp_cmd_msg_size(void)
1062 {
1063         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1064
1065         msgsize += nla_total_size(IFNAMSIZ);
1066         msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1067         msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1068
1069         return msgsize;
1070 }
1071
1072 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1073                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1074 {
1075         struct ovs_header *ovs_header;
1076         struct ovs_dp_stats dp_stats;
1077         struct ovs_dp_megaflow_stats dp_megaflow_stats;
1078         int err;
1079
1080         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1081                                    flags, cmd);
1082         if (!ovs_header)
1083                 goto error;
1084
1085         ovs_header->dp_ifindex = get_dpifindex(dp);
1086
1087         rcu_read_lock();
1088         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1089         rcu_read_unlock();
1090         if (err)
1091                 goto nla_put_failure;
1092
1093         get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1094         if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1095                         &dp_stats))
1096                 goto nla_put_failure;
1097
1098         if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1099                         sizeof(struct ovs_dp_megaflow_stats),
1100                         &dp_megaflow_stats))
1101                 goto nla_put_failure;
1102
1103         return genlmsg_end(skb, ovs_header);
1104
1105 nla_put_failure:
1106         genlmsg_cancel(skb, ovs_header);
1107 error:
1108         return -EMSGSIZE;
1109 }
1110
1111 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
1112                                              u32 seq, u8 cmd)
1113 {
1114         struct sk_buff *skb;
1115         int retval;
1116
1117         skb = genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1118         if (!skb)
1119                 return ERR_PTR(-ENOMEM);
1120
1121         retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
1122         if (retval < 0) {
1123                 kfree_skb(skb);
1124                 return ERR_PTR(retval);
1125         }
1126         return skb;
1127 }
1128
1129 /* Called with ovs_mutex. */
1130 static struct datapath *lookup_datapath(struct net *net,
1131                                         struct ovs_header *ovs_header,
1132                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1133 {
1134         struct datapath *dp;
1135
1136         if (!a[OVS_DP_ATTR_NAME])
1137                 dp = get_dp(net, ovs_header->dp_ifindex);
1138         else {
1139                 struct vport *vport;
1140
1141                 rcu_read_lock();
1142                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1143                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1144                 rcu_read_unlock();
1145         }
1146         return dp ? dp : ERR_PTR(-ENODEV);
1147 }
1148
1149 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1150 {
1151         struct nlattr **a = info->attrs;
1152         struct vport_parms parms;
1153         struct sk_buff *reply;
1154         struct datapath *dp;
1155         struct vport *vport;
1156         struct ovs_net *ovs_net;
1157         int err, i;
1158
1159         err = -EINVAL;
1160         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1161                 goto err;
1162
1163         ovs_lock();
1164
1165         err = -ENOMEM;
1166         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1167         if (dp == NULL)
1168                 goto err_unlock_ovs;
1169
1170         ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1171
1172         /* Allocate table. */
1173         err = ovs_flow_tbl_init(&dp->table);
1174         if (err)
1175                 goto err_free_dp;
1176
1177         dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1178         if (!dp->stats_percpu) {
1179                 err = -ENOMEM;
1180                 goto err_destroy_table;
1181         }
1182
1183         dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1184                             GFP_KERNEL);
1185         if (!dp->ports) {
1186                 err = -ENOMEM;
1187                 goto err_destroy_percpu;
1188         }
1189
1190         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1191                 INIT_HLIST_HEAD(&dp->ports[i]);
1192
1193         /* Set up our datapath device. */
1194         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1195         parms.type = OVS_VPORT_TYPE_INTERNAL;
1196         parms.options = NULL;
1197         parms.dp = dp;
1198         parms.port_no = OVSP_LOCAL;
1199         parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1200
1201         vport = new_vport(&parms);
1202         if (IS_ERR(vport)) {
1203                 err = PTR_ERR(vport);
1204                 if (err == -EBUSY)
1205                         err = -EEXIST;
1206
1207                 goto err_destroy_ports_array;
1208         }
1209
1210         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1211                                       info->snd_seq, OVS_DP_CMD_NEW);
1212         err = PTR_ERR(reply);
1213         if (IS_ERR(reply))
1214                 goto err_destroy_local_port;
1215
1216         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1217         list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1218
1219         ovs_unlock();
1220
1221         ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1222         return 0;
1223
1224 err_destroy_local_port:
1225         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1226 err_destroy_ports_array:
1227         kfree(dp->ports);
1228 err_destroy_percpu:
1229         free_percpu(dp->stats_percpu);
1230 err_destroy_table:
1231         ovs_flow_tbl_destroy(&dp->table);
1232 err_free_dp:
1233         release_net(ovs_dp_get_net(dp));
1234         kfree(dp);
1235 err_unlock_ovs:
1236         ovs_unlock();
1237 err:
1238         return err;
1239 }
1240
1241 /* Called with ovs_mutex. */
1242 static void __dp_destroy(struct datapath *dp)
1243 {
1244         int i;
1245
1246         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1247                 struct vport *vport;
1248                 struct hlist_node *n;
1249
1250                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1251                         if (vport->port_no != OVSP_LOCAL)
1252                                 ovs_dp_detach_port(vport);
1253         }
1254
1255         list_del_rcu(&dp->list_node);
1256
1257         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1258          * all port in datapath are destroyed first before freeing datapath.
1259          */
1260         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1261
1262         call_rcu(&dp->rcu, destroy_dp_rcu);
1263 }
1264
1265 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1266 {
1267         struct sk_buff *reply;
1268         struct datapath *dp;
1269         int err;
1270
1271         ovs_lock();
1272         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1273         err = PTR_ERR(dp);
1274         if (IS_ERR(dp))
1275                 goto unlock;
1276
1277         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1278                                       info->snd_seq, OVS_DP_CMD_DEL);
1279         err = PTR_ERR(reply);
1280         if (IS_ERR(reply))
1281                 goto unlock;
1282
1283         __dp_destroy(dp);
1284         ovs_unlock();
1285
1286         ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1287
1288         return 0;
1289 unlock:
1290         ovs_unlock();
1291         return err;
1292 }
1293
1294 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1295 {
1296         struct sk_buff *reply;
1297         struct datapath *dp;
1298         int err;
1299
1300         ovs_lock();
1301         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1302         err = PTR_ERR(dp);
1303         if (IS_ERR(dp))
1304                 goto unlock;
1305
1306         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1307                                       info->snd_seq, OVS_DP_CMD_NEW);
1308         if (IS_ERR(reply)) {
1309                 err = PTR_ERR(reply);
1310                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1311                                 ovs_dp_datapath_multicast_group.id, err);
1312                 err = 0;
1313                 goto unlock;
1314         }
1315
1316         ovs_unlock();
1317         ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1318
1319         return 0;
1320 unlock:
1321         ovs_unlock();
1322         return err;
1323 }
1324
1325 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1326 {
1327         struct sk_buff *reply;
1328         struct datapath *dp;
1329         int err;
1330
1331         ovs_lock();
1332         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1333         if (IS_ERR(dp)) {
1334                 err = PTR_ERR(dp);
1335                 goto unlock;
1336         }
1337
1338         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1339                                       info->snd_seq, OVS_DP_CMD_NEW);
1340         if (IS_ERR(reply)) {
1341                 err = PTR_ERR(reply);
1342                 goto unlock;
1343         }
1344
1345         ovs_unlock();
1346         return genlmsg_reply(reply, info);
1347
1348 unlock:
1349         ovs_unlock();
1350         return err;
1351 }
1352
1353 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1354 {
1355         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1356         struct datapath *dp;
1357         int skip = cb->args[0];
1358         int i = 0;
1359
1360         rcu_read_lock();
1361         list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1362                 if (i >= skip &&
1363                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1364                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1365                                          OVS_DP_CMD_NEW) < 0)
1366                         break;
1367                 i++;
1368         }
1369         rcu_read_unlock();
1370
1371         cb->args[0] = i;
1372
1373         return skb->len;
1374 }
1375
1376 static struct genl_ops dp_datapath_genl_ops[] = {
1377         { .cmd = OVS_DP_CMD_NEW,
1378           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1379           .policy = datapath_policy,
1380           .doit = ovs_dp_cmd_new
1381         },
1382         { .cmd = OVS_DP_CMD_DEL,
1383           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1384           .policy = datapath_policy,
1385           .doit = ovs_dp_cmd_del
1386         },
1387         { .cmd = OVS_DP_CMD_GET,
1388           .flags = 0,               /* OK for unprivileged users. */
1389           .policy = datapath_policy,
1390           .doit = ovs_dp_cmd_get,
1391           .dumpit = ovs_dp_cmd_dump
1392         },
1393         { .cmd = OVS_DP_CMD_SET,
1394           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1395           .policy = datapath_policy,
1396           .doit = ovs_dp_cmd_set,
1397         },
1398 };
1399
1400 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1401         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1402         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1403         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1404         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1405         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1406         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1407 };
1408
1409 static struct genl_family dp_vport_genl_family = {
1410         .id = GENL_ID_GENERATE,
1411         .hdrsize = sizeof(struct ovs_header),
1412         .name = OVS_VPORT_FAMILY,
1413         .version = OVS_VPORT_VERSION,
1414         .maxattr = OVS_VPORT_ATTR_MAX,
1415         .netnsok = true,
1416          SET_PARALLEL_OPS
1417 };
1418
1419 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1420         .name = OVS_VPORT_MCGROUP
1421 };
1422
1423 /* Called with ovs_mutex or RCU read lock. */
1424 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1425                                    u32 portid, u32 seq, u32 flags, u8 cmd)
1426 {
1427         struct ovs_header *ovs_header;
1428         struct ovs_vport_stats vport_stats;
1429         int err;
1430
1431         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1432                                  flags, cmd);
1433         if (!ovs_header)
1434                 return -EMSGSIZE;
1435
1436         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1437
1438         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1439             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1440             nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1441             nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
1442                 goto nla_put_failure;
1443
1444         ovs_vport_get_stats(vport, &vport_stats);
1445         if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1446                     &vport_stats))
1447                 goto nla_put_failure;
1448
1449         err = ovs_vport_get_options(vport, skb);
1450         if (err == -EMSGSIZE)
1451                 goto error;
1452
1453         return genlmsg_end(skb, ovs_header);
1454
1455 nla_put_failure:
1456         err = -EMSGSIZE;
1457 error:
1458         genlmsg_cancel(skb, ovs_header);
1459         return err;
1460 }
1461
1462 /* Called with ovs_mutex or RCU read lock. */
1463 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1464                                          u32 seq, u8 cmd)
1465 {
1466         struct sk_buff *skb;
1467         int retval;
1468
1469         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1470         if (!skb)
1471                 return ERR_PTR(-ENOMEM);
1472
1473         retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1474         BUG_ON(retval < 0);
1475
1476         return skb;
1477 }
1478
1479 /* Called with ovs_mutex or RCU read lock. */
1480 static struct vport *lookup_vport(struct net *net,
1481                                   struct ovs_header *ovs_header,
1482                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1483 {
1484         struct datapath *dp;
1485         struct vport *vport;
1486
1487         if (a[OVS_VPORT_ATTR_NAME]) {
1488                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1489                 if (!vport)
1490                         return ERR_PTR(-ENODEV);
1491                 if (ovs_header->dp_ifindex &&
1492                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1493                         return ERR_PTR(-ENODEV);
1494                 return vport;
1495         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1496                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1497
1498                 if (port_no >= DP_MAX_PORTS)
1499                         return ERR_PTR(-EFBIG);
1500
1501                 dp = get_dp(net, ovs_header->dp_ifindex);
1502                 if (!dp)
1503                         return ERR_PTR(-ENODEV);
1504
1505                 vport = ovs_vport_ovsl_rcu(dp, port_no);
1506                 if (!vport)
1507                         return ERR_PTR(-ENODEV);
1508                 return vport;
1509         } else
1510                 return ERR_PTR(-EINVAL);
1511 }
1512
1513 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1514 {
1515         struct nlattr **a = info->attrs;
1516         struct ovs_header *ovs_header = info->userhdr;
1517         struct vport_parms parms;
1518         struct sk_buff *reply;
1519         struct vport *vport;
1520         struct datapath *dp;
1521         u32 port_no;
1522         int err;
1523
1524         err = -EINVAL;
1525         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1526             !a[OVS_VPORT_ATTR_UPCALL_PID])
1527                 goto exit;
1528
1529         ovs_lock();
1530         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1531         err = -ENODEV;
1532         if (!dp)
1533                 goto exit_unlock;
1534
1535         if (a[OVS_VPORT_ATTR_PORT_NO]) {
1536                 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1537
1538                 err = -EFBIG;
1539                 if (port_no >= DP_MAX_PORTS)
1540                         goto exit_unlock;
1541
1542                 vport = ovs_vport_ovsl(dp, port_no);
1543                 err = -EBUSY;
1544                 if (vport)
1545                         goto exit_unlock;
1546         } else {
1547                 for (port_no = 1; ; port_no++) {
1548                         if (port_no >= DP_MAX_PORTS) {
1549                                 err = -EFBIG;
1550                                 goto exit_unlock;
1551                         }
1552                         vport = ovs_vport_ovsl(dp, port_no);
1553                         if (!vport)
1554                                 break;
1555                 }
1556         }
1557
1558         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1559         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1560         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1561         parms.dp = dp;
1562         parms.port_no = port_no;
1563         parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1564
1565         vport = new_vport(&parms);
1566         err = PTR_ERR(vport);
1567         if (IS_ERR(vport))
1568                 goto exit_unlock;
1569
1570         err = 0;
1571         if (a[OVS_VPORT_ATTR_STATS])
1572                 ovs_vport_set_stats(vport, nla_data(a[OVS_VPORT_ATTR_STATS]));
1573
1574         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1575                                          OVS_VPORT_CMD_NEW);
1576         if (IS_ERR(reply)) {
1577                 err = PTR_ERR(reply);
1578                 ovs_dp_detach_port(vport);
1579                 goto exit_unlock;
1580         }
1581
1582         ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
1583
1584 exit_unlock:
1585         ovs_unlock();
1586 exit:
1587         return err;
1588 }
1589
1590 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1591 {
1592         struct nlattr **a = info->attrs;
1593         struct sk_buff *reply;
1594         struct vport *vport;
1595         int err;
1596
1597         ovs_lock();
1598         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1599         err = PTR_ERR(vport);
1600         if (IS_ERR(vport))
1601                 goto exit_unlock;
1602
1603         if (a[OVS_VPORT_ATTR_TYPE] &&
1604             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1605                 err = -EINVAL;
1606                 goto exit_unlock;
1607         }
1608
1609         reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1610         if (!reply) {
1611                 err = -ENOMEM;
1612                 goto exit_unlock;
1613         }
1614
1615         if (a[OVS_VPORT_ATTR_OPTIONS]) {
1616                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1617                 if (err)
1618                         goto exit_free;
1619         }
1620
1621         if (a[OVS_VPORT_ATTR_STATS])
1622                 ovs_vport_set_stats(vport, nla_data(a[OVS_VPORT_ATTR_STATS]));
1623
1624         if (a[OVS_VPORT_ATTR_UPCALL_PID])
1625                 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1626
1627         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1628                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1629         BUG_ON(err < 0);
1630
1631         ovs_unlock();
1632         ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
1633         return 0;
1634
1635 exit_free:
1636         kfree_skb(reply);
1637 exit_unlock:
1638         ovs_unlock();
1639         return err;
1640 }
1641
1642 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1643 {
1644         struct nlattr **a = info->attrs;
1645         struct sk_buff *reply;
1646         struct vport *vport;
1647         int err;
1648
1649         ovs_lock();
1650         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1651         err = PTR_ERR(vport);
1652         if (IS_ERR(vport))
1653                 goto exit_unlock;
1654
1655         if (vport->port_no == OVSP_LOCAL) {
1656                 err = -EINVAL;
1657                 goto exit_unlock;
1658         }
1659
1660         reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
1661                                          info->snd_seq, OVS_VPORT_CMD_DEL);
1662         err = PTR_ERR(reply);
1663         if (IS_ERR(reply))
1664                 goto exit_unlock;
1665
1666         err = 0;
1667         ovs_dp_detach_port(vport);
1668
1669         ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
1670
1671 exit_unlock:
1672         ovs_unlock();
1673         return err;
1674 }
1675
1676 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1677 {
1678         struct nlattr **a = info->attrs;
1679         struct ovs_header *ovs_header = info->userhdr;
1680         struct sk_buff *reply;
1681         struct vport *vport;
1682         int err;
1683
1684         rcu_read_lock();
1685         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1686         err = PTR_ERR(vport);
1687         if (IS_ERR(vport))
1688                 goto exit_unlock;
1689
1690         reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
1691                                          info->snd_seq, OVS_VPORT_CMD_NEW);
1692         err = PTR_ERR(reply);
1693         if (IS_ERR(reply))
1694                 goto exit_unlock;
1695
1696         rcu_read_unlock();
1697
1698         return genlmsg_reply(reply, info);
1699
1700 exit_unlock:
1701         rcu_read_unlock();
1702         return err;
1703 }
1704
1705 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1706 {
1707         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1708         struct datapath *dp;
1709         int bucket = cb->args[0], skip = cb->args[1];
1710         int i, j = 0;
1711
1712         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1713         if (!dp)
1714                 return -ENODEV;
1715
1716         rcu_read_lock();
1717         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1718                 struct vport *vport;
1719
1720                 j = 0;
1721                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1722                         if (j >= skip &&
1723                             ovs_vport_cmd_fill_info(vport, skb,
1724                                                     NETLINK_CB(cb->skb).portid,
1725                                                     cb->nlh->nlmsg_seq,
1726                                                     NLM_F_MULTI,
1727                                                     OVS_VPORT_CMD_NEW) < 0)
1728                                 goto out;
1729
1730                         j++;
1731                 }
1732                 skip = 0;
1733         }
1734 out:
1735         rcu_read_unlock();
1736
1737         cb->args[0] = i;
1738         cb->args[1] = j;
1739
1740         return skb->len;
1741 }
1742
1743 static struct genl_ops dp_vport_genl_ops[] = {
1744         { .cmd = OVS_VPORT_CMD_NEW,
1745           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1746           .policy = vport_policy,
1747           .doit = ovs_vport_cmd_new
1748         },
1749         { .cmd = OVS_VPORT_CMD_DEL,
1750           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1751           .policy = vport_policy,
1752           .doit = ovs_vport_cmd_del
1753         },
1754         { .cmd = OVS_VPORT_CMD_GET,
1755           .flags = 0,               /* OK for unprivileged users. */
1756           .policy = vport_policy,
1757           .doit = ovs_vport_cmd_get,
1758           .dumpit = ovs_vport_cmd_dump
1759         },
1760         { .cmd = OVS_VPORT_CMD_SET,
1761           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1762           .policy = vport_policy,
1763           .doit = ovs_vport_cmd_set,
1764         },
1765 };
1766
1767 struct genl_family_and_ops {
1768         struct genl_family *family;
1769         struct genl_ops *ops;
1770         int n_ops;
1771         struct genl_multicast_group *group;
1772 };
1773
1774 static const struct genl_family_and_ops dp_genl_families[] = {
1775         { &dp_datapath_genl_family,
1776           dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1777           &ovs_dp_datapath_multicast_group },
1778         { &dp_vport_genl_family,
1779           dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1780           &ovs_dp_vport_multicast_group },
1781         { &dp_flow_genl_family,
1782           dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1783           &ovs_dp_flow_multicast_group },
1784         { &dp_packet_genl_family,
1785           dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1786           NULL },
1787 };
1788
1789 static void dp_unregister_genl(int n_families)
1790 {
1791         int i;
1792
1793         for (i = 0; i < n_families; i++)
1794                 genl_unregister_family(dp_genl_families[i].family);
1795 }
1796
1797 static int dp_register_genl(void)
1798 {
1799         int n_registered;
1800         int err;
1801         int i;
1802
1803         n_registered = 0;
1804         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1805                 const struct genl_family_and_ops *f = &dp_genl_families[i];
1806
1807                 err = genl_register_family_with_ops(f->family, f->ops,
1808                                                     f->n_ops);
1809                 if (err)
1810                         goto error;
1811                 n_registered++;
1812
1813                 if (f->group) {
1814                         err = genl_register_mc_group(f->family, f->group);
1815                         if (err)
1816                                 goto error;
1817                 }
1818         }
1819
1820         return 0;
1821
1822 error:
1823         dp_unregister_genl(n_registered);
1824         return err;
1825 }
1826
1827 static int __net_init ovs_init_net(struct net *net)
1828 {
1829         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1830
1831         INIT_LIST_HEAD(&ovs_net->dps);
1832         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
1833         return 0;
1834 }
1835
1836 static void __net_exit ovs_exit_net(struct net *net)
1837 {
1838         struct datapath *dp, *dp_next;
1839         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1840
1841         ovs_lock();
1842         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
1843                 __dp_destroy(dp);
1844         ovs_unlock();
1845
1846         cancel_work_sync(&ovs_net->dp_notify_work);
1847 }
1848
1849 static struct pernet_operations ovs_net_ops = {
1850         .init = ovs_init_net,
1851         .exit = ovs_exit_net,
1852         .id   = &ovs_net_id,
1853         .size = sizeof(struct ovs_net),
1854 };
1855
1856 DEFINE_COMPAT_PNET_REG_FUNC(device);
1857
1858 static int __init dp_init(void)
1859 {
1860         int err;
1861
1862         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
1863
1864         pr_info("Open vSwitch switching datapath %s, built "__DATE__" "__TIME__"\n",
1865                 VERSION);
1866
1867         err = ovs_flow_init();
1868         if (err)
1869                 goto error;
1870
1871         err = ovs_vport_init();
1872         if (err)
1873                 goto error_flow_exit;
1874
1875         err = register_pernet_device(&ovs_net_ops);
1876         if (err)
1877                 goto error_vport_exit;
1878
1879         err = register_netdevice_notifier(&ovs_dp_device_notifier);
1880         if (err)
1881                 goto error_netns_exit;
1882
1883         err = dp_register_genl();
1884         if (err < 0)
1885                 goto error_unreg_notifier;
1886
1887         return 0;
1888
1889 error_unreg_notifier:
1890         unregister_netdevice_notifier(&ovs_dp_device_notifier);
1891 error_netns_exit:
1892         unregister_pernet_device(&ovs_net_ops);
1893 error_vport_exit:
1894         ovs_vport_exit();
1895 error_flow_exit:
1896         ovs_flow_exit();
1897 error:
1898         return err;
1899 }
1900
1901 static void dp_cleanup(void)
1902 {
1903         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
1904         unregister_netdevice_notifier(&ovs_dp_device_notifier);
1905         unregister_pernet_device(&ovs_net_ops);
1906         rcu_barrier();
1907         ovs_vport_exit();
1908         ovs_flow_exit();
1909 }
1910
1911 module_init(dp_init);
1912 module_exit(dp_cleanup);
1913
1914 MODULE_DESCRIPTION("Open vSwitch switching datapath");
1915 MODULE_LICENSE("GPL");
1916 MODULE_VERSION(VERSION);