net/openvswitch/datapath.c

   1 /*
   2  * Copyright (c) 2007-2013 Nicira, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of version 2 of the GNU General Public
   6  * License as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  16  * 02110-1301, USA
  17  */
  18
  19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  20
  21 #include <linux/init.h>
  22 #include <linux/module.h>
  23 #include <linux/if_arp.h>
  24 #include <linux/if_vlan.h>
  25 #include <linux/in.h>
  26 #include <linux/ip.h>
  27 #include <linux/jhash.h>
  28 #include <linux/delay.h>
  29 #include <linux/time.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/genetlink.h>
  32 #include <linux/kernel.h>
  33 #include <linux/kthread.h>
  34 #include <linux/mutex.h>
  35 #include <linux/percpu.h>
  36 #include <linux/rcupdate.h>
  37 #include <linux/tcp.h>
  38 #include <linux/udp.h>
  39 #include <linux/ethtool.h>
  40 #include <linux/wait.h>
  41 #include <asm/div64.h>
  42 #include <linux/highmem.h>
  43 #include <linux/netfilter_bridge.h>
  44 #include <linux/netfilter_ipv4.h>
  45 #include <linux/inetdevice.h>
  46 #include <linux/list.h>
  47 #include <linux/lockdep.h>
  48 #include <linux/openvswitch.h>
  49 #include <linux/rculist.h>
  50 #include <linux/dmi.h>
  51 #include <linux/workqueue.h>
  52 #include <net/genetlink.h>
  53 #include <net/net_namespace.h>
  54 #include <net/netns/generic.h>
  55
  56 #include "datapath.h"
  57 #include "flow.h"
  58 #include "flow_netlink.h"
  59 #include "vport-internal_dev.h"
  60 #include "vport-netdev.h"
  61
  62 int ovs_net_id __read_mostly;
  63
  64 static void ovs_notify(struct genl_family *family,
  65                        struct sk_buff *skb, struct genl_info *info)
  66 {
  67         genl_notify(family, skb, genl_info_net(info), info->snd_portid,
  68                     0, info->nlhdr, GFP_KERNEL);
  69 }
  70
  71 /**
  72  * DOC: Locking:
  73  *
  74  * All writes e.g. Writes to device state (add/remove datapath, port, set
  75  * operations on vports, etc.), Writes to other state (flow table
  76  * modifications, set miscellaneous datapath parameters, etc.) are protected
  77  * by ovs_lock.
  78  *
  79  * Reads are protected by RCU.
  80  *
  81  * There are a few special cases (mostly stats) that have their own
  82  * synchronization but they nest under all of above and don't interact with
  83  * each other.
  84  *
  85  * The RTNL lock nests inside ovs_mutex.
  86  */
  87
  88 static DEFINE_MUTEX(ovs_mutex);
  89
  90 void ovs_lock(void)
  91 {
  92         mutex_lock(&ovs_mutex);
  93 }
  94
  95 void ovs_unlock(void)
  96 {
  97         mutex_unlock(&ovs_mutex);
  98 }
  99
 100 #ifdef CONFIG_LOCKDEP
 101 int lockdep_ovsl_is_held(void)
 102 {
 103         if (debug_locks)
 104                 return lockdep_is_held(&ovs_mutex);
 105         else
 106                 return 1;
 107 }
 108 #endif
 109
 110 static struct vport *new_vport(const struct vport_parms *);
 111 static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *,
 112                              const struct dp_upcall_info *);
 113 static int queue_userspace_packet(struct net *, int dp_ifindex,
 114                                   struct sk_buff *,
 115                                   const struct dp_upcall_info *);
 116
 117 /* Must be called with rcu_read_lock or ovs_mutex. */
 118 static struct datapath *get_dp(struct net *net, int dp_ifindex)
 119 {
 120         struct datapath *dp = NULL;
 121         struct net_device *dev;
 122
 123         rcu_read_lock();
 124         dev = dev_get_by_index_rcu(net, dp_ifindex);
 125         if (dev) {
 126                 struct vport *vport = ovs_internal_dev_get_vport(dev);
 127                 if (vport)
 128                         dp = vport->dp;
 129         }
 130         rcu_read_unlock();
 131
 132         return dp;
 133 }
 134
 135 /* Must be called with rcu_read_lock or ovs_mutex. */
 136 const char *ovs_dp_name(const struct datapath *dp)
 137 {
 138         struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
 139         return vport->ops->get_name(vport);
 140 }
 141
 142 static int get_dpifindex(struct datapath *dp)
 143 {
 144         struct vport *local;
 145         int ifindex;
 146
 147         rcu_read_lock();
 148
 149         local = ovs_vport_rcu(dp, OVSP_LOCAL);
 150         if (local)
 151                 ifindex = netdev_vport_priv(local)->dev->ifindex;
 152         else
 153                 ifindex = 0;
 154
 155         rcu_read_unlock();
 156
 157         return ifindex;
 158 }
 159
 160 static void destroy_dp_rcu(struct rcu_head *rcu)
 161 {
 162         struct datapath *dp = container_of(rcu, struct datapath, rcu);
 163
 164         ovs_flow_tbl_destroy(&dp->table);
 165         free_percpu(dp->stats_percpu);
 166         release_net(ovs_dp_get_net(dp));
 167         kfree(dp->ports);
 168         kfree(dp);
 169 }
 170
 171 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
 172                                             u16 port_no)
 173 {
 174         return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
 175 }
 176
 177 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
 178 {
 179         struct vport *vport;
 180         struct hlist_head *head;
 181
 182         head = vport_hash_bucket(dp, port_no);
 183         hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
 184                 if (vport->port_no == port_no)
 185                         return vport;
 186         }
 187         return NULL;
 188 }
 189
 190 /* Called with ovs_mutex. */
 191 static struct vport *new_vport(const struct vport_parms *parms)
 192 {
 193         struct vport *vport;
 194
 195         vport = ovs_vport_add(parms);
 196         if (!IS_ERR(vport)) {
 197                 struct datapath *dp = parms->dp;
 198                 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
 199
 200                 hlist_add_head_rcu(&vport->dp_hash_node, head);
 201         }
 202         return vport;
 203 }
 204
 205 void ovs_dp_detach_port(struct vport *p)
 206 {
 207         ASSERT_OVSL();
 208
 209         /* First drop references to device. */
 210         hlist_del_rcu(&p->dp_hash_node);
 211
 212         /* Then destroy it. */
 213         ovs_vport_del(p);
 214 }
 215
 216 /* Must be called with rcu_read_lock. */
 217 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
 218 {
 219         struct datapath *dp = p->dp;
 220         struct sw_flow *flow;
 221         struct dp_stats_percpu *stats;
 222         struct sw_flow_key key;
 223         u64 *stats_counter;
 224         u32 n_mask_hit;
 225         int error;
 226
 227         stats = this_cpu_ptr(dp->stats_percpu);
 228
 229         /* Extract flow from 'skb' into 'key'. */
 230         error = ovs_flow_extract(skb, p->port_no, &key);
 231         if (unlikely(error)) {
 232                 kfree_skb(skb);
 233                 return;
 234         }
 235
 236         /* Look up flow. */
 237         flow = ovs_flow_tbl_lookup(&dp->table, &key, &n_mask_hit);
 238         if (unlikely(!flow)) {
 239                 struct dp_upcall_info upcall;
 240
 241                 upcall.cmd = OVS_PACKET_CMD_MISS;
 242                 upcall.key = &key;
 243                 upcall.userdata = NULL;
 244                 upcall.portid = p->upcall_portid;
 245                 ovs_dp_upcall(dp, skb, &upcall);
 246                 consume_skb(skb);
 247                 stats_counter = &stats->n_missed;
 248                 goto out;
 249         }
 250
 251         OVS_CB(skb)->flow = flow;
 252         OVS_CB(skb)->pkt_key = &key;
 253
 254         stats_counter = &stats->n_hit;
 255         ovs_flow_used(OVS_CB(skb)->flow, skb);
 256         ovs_execute_actions(dp, skb);
 257
 258 out:
 259         /* Update datapath statistics. */
 260         u64_stats_update_begin(&stats->sync);
 261         (*stats_counter)++;
 262         stats->n_mask_hit += n_mask_hit;
 263         u64_stats_update_end(&stats->sync);
 264 }
 265
 266 static struct genl_family dp_packet_genl_family = {
 267         .id = GENL_ID_GENERATE,
 268         .hdrsize = sizeof(struct ovs_header),
 269         .name = OVS_PACKET_FAMILY,
 270         .version = OVS_PACKET_VERSION,
 271         .maxattr = OVS_PACKET_ATTR_MAX,
 272         .netnsok = true,
 273         .parallel_ops = true,
 274 };
 275
 276 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
 277                   const struct dp_upcall_info *upcall_info)
 278 {
 279         struct dp_stats_percpu *stats;
 280         int dp_ifindex;
 281         int err;
 282
 283         if (upcall_info->portid == 0) {
 284                 err = -ENOTCONN;
 285                 goto err;
 286         }
 287
 288         dp_ifindex = get_dpifindex(dp);
 289         if (!dp_ifindex) {
 290                 err = -ENODEV;
 291                 goto err;
 292         }
 293
 294         if (!skb_is_gso(skb))
 295                 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
 296         else
 297                 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
 298         if (err)
 299                 goto err;
 300
 301         return 0;
 302
 303 err:
 304         stats = this_cpu_ptr(dp->stats_percpu);
 305
 306         u64_stats_update_begin(&stats->sync);
 307         stats->n_lost++;
 308         u64_stats_update_end(&stats->sync);
 309
 310         return err;
 311 }
 312
 313 static int queue_gso_packets(struct net *net, int dp_ifindex,
 314                              struct sk_buff *skb,
 315                              const struct dp_upcall_info *upcall_info)
 316 {
 317         unsigned short gso_type = skb_shinfo(skb)->gso_type;
 318         struct dp_upcall_info later_info;
 319         struct sw_flow_key later_key;
 320         struct sk_buff *segs, *nskb;
 321         int err;
 322
 323         segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false);
 324         if (IS_ERR(segs))
 325                 return PTR_ERR(segs);
 326
 327         /* Queue all of the segments. */
 328         skb = segs;
 329         do {
 330                 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
 331                 if (err)
 332                         break;
 333
 334                 if (skb == segs && gso_type & SKB_GSO_UDP) {
 335                         /* The initial flow key extracted by ovs_flow_extract()
 336                          * in this case is for a first fragment, so we need to
 337                          * properly mark later fragments.
 338                          */
 339                         later_key = *upcall_info->key;
 340                         later_key.ip.frag = OVS_FRAG_TYPE_LATER;
 341
 342                         later_info = *upcall_info;
 343                         later_info.key = &later_key;
 344                         upcall_info = &later_info;
 345                 }
 346         } while ((skb = skb->next));
 347
 348         /* Free all of the segments. */
 349         skb = segs;
 350         do {
 351                 nskb = skb->next;
 352                 if (err)
 353                         kfree_skb(skb);
 354                 else
 355                         consume_skb(skb);
 356         } while ((skb = nskb));
 357         return err;
 358 }
 359
 360 static size_t key_attr_size(void)
 361 {
 362         return    nla_total_size(4)   /* OVS_KEY_ATTR_PRIORITY */
 363                 + nla_total_size(0)   /* OVS_KEY_ATTR_TUNNEL */
 364                   + nla_total_size(8)   /* OVS_TUNNEL_KEY_ATTR_ID */
 365                   + nla_total_size(4)   /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
 366                   + nla_total_size(4)   /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
 367                   + nla_total_size(1)   /* OVS_TUNNEL_KEY_ATTR_TOS */
 368                   + nla_total_size(1)   /* OVS_TUNNEL_KEY_ATTR_TTL */
 369                   + nla_total_size(0)   /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
 370                   + nla_total_size(0)   /* OVS_TUNNEL_KEY_ATTR_CSUM */
 371                 + nla_total_size(4)   /* OVS_KEY_ATTR_IN_PORT */
 372                 + nla_total_size(4)   /* OVS_KEY_ATTR_SKB_MARK */
 373                 + nla_total_size(12)  /* OVS_KEY_ATTR_ETHERNET */
 374                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 375                 + nla_total_size(4)   /* OVS_KEY_ATTR_8021Q */
 376                 + nla_total_size(0)   /* OVS_KEY_ATTR_ENCAP */
 377                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 378                 + nla_total_size(40)  /* OVS_KEY_ATTR_IPV6 */
 379                 + nla_total_size(2)   /* OVS_KEY_ATTR_ICMPV6 */
 380                 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
 381 }
 382
 383 static size_t upcall_msg_size(const struct sk_buff *skb,
 384                               const struct nlattr *userdata)
 385 {
 386         size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
 387                 + nla_total_size(skb->len) /* OVS_PACKET_ATTR_PACKET */
 388                 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
 389
 390         /* OVS_PACKET_ATTR_USERDATA */
 391         if (userdata)
 392                 size += NLA_ALIGN(userdata->nla_len);
 393
 394         return size;
 395 }
 396
 397 static int queue_userspace_packet(struct net *net, int dp_ifindex,
 398                                   struct sk_buff *skb,
 399                                   const struct dp_upcall_info *upcall_info)
 400 {
 401         struct ovs_header *upcall;
 402         struct sk_buff *nskb = NULL;
 403         struct sk_buff *user_skb; /* to be queued to userspace */
 404         struct nlattr *nla;
 405         int err;
 406
 407         if (vlan_tx_tag_present(skb)) {
 408                 nskb = skb_clone(skb, GFP_ATOMIC);
 409                 if (!nskb)
 410                         return -ENOMEM;
 411
 412                 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb));
 413                 if (!nskb)
 414                         return -ENOMEM;
 415
 416                 nskb->vlan_tci = 0;
 417                 skb = nskb;
 418         }
 419
 420         if (nla_attr_size(skb->len) > USHRT_MAX) {
 421                 err = -EFBIG;
 422                 goto out;
 423         }
 424
 425         user_skb = genlmsg_new(upcall_msg_size(skb, upcall_info->userdata), GFP_ATOMIC);
 426         if (!user_skb) {
 427                 err = -ENOMEM;
 428                 goto out;
 429         }
 430
 431         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
 432                              0, upcall_info->cmd);
 433         upcall->dp_ifindex = dp_ifindex;
 434
 435         nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
 436         ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb);
 437         nla_nest_end(user_skb, nla);
 438
 439         if (upcall_info->userdata)
 440                 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
 441                           nla_len(upcall_info->userdata),
 442                           nla_data(upcall_info->userdata));
 443
 444         nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
 445
 446         skb_copy_and_csum_dev(skb, nla_data(nla));
 447
 448         genlmsg_end(user_skb, upcall);
 449         err = genlmsg_unicast(net, user_skb, upcall_info->portid);
 450
 451 out:
 452         kfree_skb(nskb);
 453         return err;
 454 }
 455
 456 static void clear_stats(struct sw_flow *flow)
 457 {
 458         flow->used = 0;
 459         flow->tcp_flags = 0;
 460         flow->packet_count = 0;
 461         flow->byte_count = 0;
 462 }
 463
 464 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 465 {
 466         struct ovs_header *ovs_header = info->userhdr;
 467         struct nlattr **a = info->attrs;
 468         struct sw_flow_actions *acts;
 469         struct sk_buff *packet;
 470         struct sw_flow *flow;
 471         struct datapath *dp;
 472         struct ethhdr *eth;
 473         int len;
 474         int err;
 475
 476         err = -EINVAL;
 477         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 478             !a[OVS_PACKET_ATTR_ACTIONS])
 479                 goto err;
 480
 481         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 482         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 483         err = -ENOMEM;
 484         if (!packet)
 485                 goto err;
 486         skb_reserve(packet, NET_IP_ALIGN);
 487
 488         nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
 489
 490         skb_reset_mac_header(packet);
 491         eth = eth_hdr(packet);
 492
 493         /* Normally, setting the skb 'protocol' field would be handled by a
 494          * call to eth_type_trans(), but it assumes there's a sending
 495          * device, which we may not have. */
 496         if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
 497                 packet->protocol = eth->h_proto;
 498         else
 499                 packet->protocol = htons(ETH_P_802_2);
 500
 501         /* Build an sw_flow for sending this packet. */
 502         flow = ovs_flow_alloc();
 503         err = PTR_ERR(flow);
 504         if (IS_ERR(flow))
 505                 goto err_kfree_skb;
 506
 507         err = ovs_flow_extract(packet, -1, &flow->key);
 508         if (err)
 509                 goto err_flow_free;
 510
 511         err = ovs_nla_get_flow_metadata(flow, a[OVS_PACKET_ATTR_KEY]);
 512         if (err)
 513                 goto err_flow_free;
 514         acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
 515         err = PTR_ERR(acts);
 516         if (IS_ERR(acts))
 517                 goto err_flow_free;
 518
 519         err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
 520                                    &flow->key, 0, &acts);
 521         rcu_assign_pointer(flow->sf_acts, acts);
 522         if (err)
 523                 goto err_flow_free;
 524
 525         OVS_CB(packet)->flow = flow;
 526         OVS_CB(packet)->pkt_key = &flow->key;
 527         packet->priority = flow->key.phy.priority;
 528         packet->mark = flow->key.phy.skb_mark;
 529
 530         rcu_read_lock();
 531         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 532         err = -ENODEV;
 533         if (!dp)
 534                 goto err_unlock;
 535
 536         local_bh_disable();
 537         err = ovs_execute_actions(dp, packet);
 538         local_bh_enable();
 539         rcu_read_unlock();
 540
 541         ovs_flow_free(flow, false);
 542         return err;
 543
 544 err_unlock:
 545         rcu_read_unlock();
 546 err_flow_free:
 547         ovs_flow_free(flow, false);
 548 err_kfree_skb:
 549         kfree_skb(packet);
 550 err:
 551         return err;
 552 }
 553
 554 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 555         [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
 556         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 557         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 558 };
 559
 560 static const struct genl_ops dp_packet_genl_ops[] = {
 561         { .cmd = OVS_PACKET_CMD_EXECUTE,
 562           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 563           .policy = packet_policy,
 564           .doit = ovs_packet_cmd_execute
 565         }
 566 };
 567
 568 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats,
 569                          struct ovs_dp_megaflow_stats *mega_stats)
 570 {
 571         int i;
 572
 573         memset(mega_stats, 0, sizeof(*mega_stats));
 574
 575         stats->n_flows = ovs_flow_tbl_count(&dp->table);
 576         mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
 577
 578         stats->n_hit = stats->n_missed = stats->n_lost = 0;
 579
 580         for_each_possible_cpu(i) {
 581                 const struct dp_stats_percpu *percpu_stats;
 582                 struct dp_stats_percpu local_stats;
 583                 unsigned int start;
 584
 585                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 586
 587                 do {
 588                         start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
 589                         local_stats = *percpu_stats;
 590                 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
 591
 592                 stats->n_hit += local_stats.n_hit;
 593                 stats->n_missed += local_stats.n_missed;
 594                 stats->n_lost += local_stats.n_lost;
 595                 mega_stats->n_mask_hit += local_stats.n_mask_hit;
 596         }
 597 }
 598
 599 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
 600         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
 601         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
 602         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
 603 };
 604
 605 static struct genl_family dp_flow_genl_family = {
 606         .id = GENL_ID_GENERATE,
 607         .hdrsize = sizeof(struct ovs_header),
 608         .name = OVS_FLOW_FAMILY,
 609         .version = OVS_FLOW_VERSION,
 610         .maxattr = OVS_FLOW_ATTR_MAX,
 611         .netnsok = true,
 612         .parallel_ops = true,
 613 };
 614
 615 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
 616         .name = OVS_FLOW_MCGROUP
 617 };
 618
 619 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
 620 {
 621         return NLMSG_ALIGN(sizeof(struct ovs_header))
 622                 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
 623                 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
 624                 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
 625                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
 626                 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
 627                 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
 628 }
 629
 630 /* Called with ovs_mutex. */
 631 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
 632                                   struct sk_buff *skb, u32 portid,
 633                                   u32 seq, u32 flags, u8 cmd)
 634 {
 635         const int skb_orig_len = skb->len;
 636         struct nlattr *start;
 637         struct ovs_flow_stats stats;
 638         struct ovs_header *ovs_header;
 639         struct nlattr *nla;
 640         unsigned long used;
 641         u8 tcp_flags;
 642         int err;
 643
 644         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
 645         if (!ovs_header)
 646                 return -EMSGSIZE;
 647
 648         ovs_header->dp_ifindex = get_dpifindex(dp);
 649
 650         /* Fill flow key. */
 651         nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
 652         if (!nla)
 653                 goto nla_put_failure;
 654
 655         err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb);
 656         if (err)
 657                 goto error;
 658         nla_nest_end(skb, nla);
 659
 660         nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
 661         if (!nla)
 662                 goto nla_put_failure;
 663
 664         err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb);
 665         if (err)
 666                 goto error;
 667
 668         nla_nest_end(skb, nla);
 669
 670         spin_lock_bh(&flow->lock);
 671         used = flow->used;
 672         stats.n_packets = flow->packet_count;
 673         stats.n_bytes = flow->byte_count;
 674         tcp_flags = (u8)ntohs(flow->tcp_flags);
 675         spin_unlock_bh(&flow->lock);
 676
 677         if (used &&
 678             nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
 679                 goto nla_put_failure;
 680
 681         if (stats.n_packets &&
 682             nla_put(skb, OVS_FLOW_ATTR_STATS,
 683                     sizeof(struct ovs_flow_stats), &stats))
 684                 goto nla_put_failure;
 685
 686         if (tcp_flags &&
 687             nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
 688                 goto nla_put_failure;
 689
 690         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 691          * this is the first flow to be dumped into 'skb'.  This is unusual for
 692          * Netlink but individual action lists can be longer than
 693          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 694          * The userspace caller can always fetch the actions separately if it
 695          * really wants them.  (Most userspace callers in fact don't care.)
 696          *
 697          * This can only fail for dump operations because the skb is always
 698          * properly sized for single flows.
 699          */
 700         start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
 701         if (start) {
 702                 const struct sw_flow_actions *sf_acts;
 703
 704                 sf_acts = rcu_dereference_check(flow->sf_acts,
 705                                                 lockdep_ovsl_is_held());
 706
 707                 err = ovs_nla_put_actions(sf_acts->actions,
 708                                           sf_acts->actions_len, skb);
 709                 if (!err)
 710                         nla_nest_end(skb, start);
 711                 else {
 712                         if (skb_orig_len)
 713                                 goto error;
 714
 715                         nla_nest_cancel(skb, start);
 716                 }
 717         } else if (skb_orig_len)
 718                 goto nla_put_failure;
 719
 720         return genlmsg_end(skb, ovs_header);
 721
 722 nla_put_failure:
 723         err = -EMSGSIZE;
 724 error:
 725         genlmsg_cancel(skb, ovs_header);
 726         return err;
 727 }
 728
 729 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
 730 {
 731         const struct sw_flow_actions *sf_acts;
 732
 733         sf_acts = ovsl_dereference(flow->sf_acts);
 734
 735         return genlmsg_new(ovs_flow_cmd_msg_size(sf_acts), GFP_KERNEL);
 736 }
 737
 738 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
 739                                                struct datapath *dp,
 740                                                u32 portid, u32 seq, u8 cmd)
 741 {
 742         struct sk_buff *skb;
 743         int retval;
 744
 745         skb = ovs_flow_cmd_alloc_info(flow);
 746         if (!skb)
 747                 return ERR_PTR(-ENOMEM);
 748
 749         retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
 750         BUG_ON(retval < 0);
 751         return skb;
 752 }
 753
 754 static struct sw_flow *__ovs_flow_tbl_lookup(struct flow_table *tbl,
 755                                               const struct sw_flow_key *key)
 756 {
 757         u32 __always_unused n_mask_hit;
 758
 759         return ovs_flow_tbl_lookup(tbl, key, &n_mask_hit);
 760 }
 761
 762 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
 763 {
 764         struct nlattr **a = info->attrs;
 765         struct ovs_header *ovs_header = info->userhdr;
 766         struct sw_flow_key key, masked_key;
 767         struct sw_flow *flow = NULL;
 768         struct sw_flow_mask mask;
 769         struct sk_buff *reply;
 770         struct datapath *dp;
 771         struct sw_flow_actions *acts = NULL;
 772         struct sw_flow_match match;
 773         int error;
 774
 775         /* Extract key. */
 776         error = -EINVAL;
 777         if (!a[OVS_FLOW_ATTR_KEY])
 778                 goto error;
 779
 780         ovs_match_init(&match, &key, &mask);
 781         error = ovs_nla_get_match(&match,
 782                                   a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
 783         if (error)
 784                 goto error;
 785
 786         /* Validate actions. */
 787         if (a[OVS_FLOW_ATTR_ACTIONS]) {
 788                 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
 789                 error = PTR_ERR(acts);
 790                 if (IS_ERR(acts))
 791                         goto error;
 792
 793                 ovs_flow_mask_key(&masked_key, &key, &mask);
 794                 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS],
 795                                              &masked_key, 0, &acts);
 796                 if (error) {
 797                         OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
 798                         goto err_kfree;
 799                 }
 800         } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
 801                 error = -EINVAL;
 802                 goto error;
 803         }
 804
 805         ovs_lock();
 806         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 807         error = -ENODEV;
 808         if (!dp)
 809                 goto err_unlock_ovs;
 810
 811         /* Check if this is a duplicate flow */
 812         flow = __ovs_flow_tbl_lookup(&dp->table, &key);
 813         if (!flow) {
 814                 /* Bail out if we're not allowed to create a new flow. */
 815                 error = -ENOENT;
 816                 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
 817                         goto err_unlock_ovs;
 818
 819                 /* Allocate flow. */
 820                 flow = ovs_flow_alloc();
 821                 if (IS_ERR(flow)) {
 822                         error = PTR_ERR(flow);
 823                         goto err_unlock_ovs;
 824                 }
 825                 clear_stats(flow);
 826
 827                 flow->key = masked_key;
 828                 flow->unmasked_key = key;
 829                 rcu_assign_pointer(flow->sf_acts, acts);
 830
 831                 /* Put flow in bucket. */
 832                 error = ovs_flow_tbl_insert(&dp->table, flow, &mask);
 833                 if (error) {
 834                         acts = NULL;
 835                         goto err_flow_free;
 836                 }
 837
 838                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
 839                                                 info->snd_seq, OVS_FLOW_CMD_NEW);
 840         } else {
 841                 /* We found a matching flow. */
 842                 struct sw_flow_actions *old_acts;
 843
 844                 /* Bail out if we're not allowed to modify an existing flow.
 845                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
 846                  * because Generic Netlink treats the latter as a dump
 847                  * request.  We also accept NLM_F_EXCL in case that bug ever
 848                  * gets fixed.
 849                  */
 850                 error = -EEXIST;
 851                 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
 852                     info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
 853                         goto err_unlock_ovs;
 854
 855                 /* The unmasked key has to be the same for flow updates. */
 856                 error = -EINVAL;
 857                 if (!ovs_flow_cmp_unmasked_key(flow, &match)) {
 858                         OVS_NLERR("Flow modification message rejected, unmasked key does not match.\n");
 859                         goto err_unlock_ovs;
 860                 }
 861
 862                 /* Update actions. */
 863                 old_acts = ovsl_dereference(flow->sf_acts);
 864                 rcu_assign_pointer(flow->sf_acts, acts);
 865                 ovs_nla_free_flow_actions(old_acts);
 866
 867                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
 868                                                info->snd_seq, OVS_FLOW_CMD_NEW);
 869
 870                 /* Clear stats. */
 871                 if (a[OVS_FLOW_ATTR_CLEAR]) {
 872                         spin_lock_bh(&flow->lock);
 873                         clear_stats(flow);
 874                         spin_unlock_bh(&flow->lock);
 875                 }
 876         }
 877         ovs_unlock();
 878
 879         if (!IS_ERR(reply))
 880                 ovs_notify(&dp_flow_genl_family, reply, info);
 881         else
 882                 genl_set_err(&dp_flow_genl_family, sock_net(skb->sk), 0,
 883                              0, PTR_ERR(reply));
 884         return 0;
 885
 886 err_flow_free:
 887         ovs_flow_free(flow, false);
 888 err_unlock_ovs:
 889         ovs_unlock();
 890 err_kfree:
 891         kfree(acts);
 892 error:
 893         return error;
 894 }
 895
 896 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
 897 {
 898         struct nlattr **a = info->attrs;
 899         struct ovs_header *ovs_header = info->userhdr;
 900         struct sw_flow_key key;
 901         struct sk_buff *reply;
 902         struct sw_flow *flow;
 903         struct datapath *dp;
 904         struct sw_flow_match match;
 905         int err;
 906
 907         if (!a[OVS_FLOW_ATTR_KEY]) {
 908                 OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
 909                 return -EINVAL;
 910         }
 911
 912         ovs_match_init(&match, &key, NULL);
 913         err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
 914         if (err)
 915                 return err;
 916
 917         ovs_lock();
 918         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 919         if (!dp) {
 920                 err = -ENODEV;
 921                 goto unlock;
 922         }
 923
 924         flow = __ovs_flow_tbl_lookup(&dp->table, &key);
 925         if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) {
 926                 err = -ENOENT;
 927                 goto unlock;
 928         }
 929
 930         reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
 931                                         info->snd_seq, OVS_FLOW_CMD_NEW);
 932         if (IS_ERR(reply)) {
 933                 err = PTR_ERR(reply);
 934                 goto unlock;
 935         }
 936
 937         ovs_unlock();
 938         return genlmsg_reply(reply, info);
 939 unlock:
 940         ovs_unlock();
 941         return err;
 942 }
 943
 944 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
 945 {
 946         struct nlattr **a = info->attrs;
 947         struct ovs_header *ovs_header = info->userhdr;
 948         struct sw_flow_key key;
 949         struct sk_buff *reply;
 950         struct sw_flow *flow;
 951         struct datapath *dp;
 952         struct sw_flow_match match;
 953         int err;
 954
 955         ovs_lock();
 956         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 957         if (!dp) {
 958                 err = -ENODEV;
 959                 goto unlock;
 960         }
 961
 962         if (!a[OVS_FLOW_ATTR_KEY]) {
 963                 err = ovs_flow_tbl_flush(&dp->table);
 964                 goto unlock;
 965         }
 966
 967         ovs_match_init(&match, &key, NULL);
 968         err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
 969         if (err)
 970                 goto unlock;
 971
 972         flow = __ovs_flow_tbl_lookup(&dp->table, &key);
 973         if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) {
 974                 err = -ENOENT;
 975                 goto unlock;
 976         }
 977
 978         reply = ovs_flow_cmd_alloc_info(flow);
 979         if (!reply) {
 980                 err = -ENOMEM;
 981                 goto unlock;
 982         }
 983
 984         ovs_flow_tbl_remove(&dp->table, flow);
 985
 986         err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
 987                                      info->snd_seq, 0, OVS_FLOW_CMD_DEL);
 988         BUG_ON(err < 0);
 989
 990         ovs_flow_free(flow, true);
 991         ovs_unlock();
 992
 993         ovs_notify(&dp_flow_genl_family, reply, info);
 994         return 0;
 995 unlock:
 996         ovs_unlock();
 997         return err;
 998 }
 999
1000 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1001 {
1002         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1003         struct table_instance *ti;
1004         struct datapath *dp;
1005
1006         rcu_read_lock();
1007         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1008         if (!dp) {
1009                 rcu_read_unlock();
1010                 return -ENODEV;
1011         }
1012
1013         ti = rcu_dereference(dp->table.ti);
1014         for (;;) {
1015                 struct sw_flow *flow;
1016                 u32 bucket, obj;
1017
1018                 bucket = cb->args[0];
1019                 obj = cb->args[1];
1020                 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1021                 if (!flow)
1022                         break;
1023
1024                 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1025                                            NETLINK_CB(cb->skb).portid,
1026                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1027                                            OVS_FLOW_CMD_NEW) < 0)
1028                         break;
1029
1030                 cb->args[0] = bucket;
1031                 cb->args[1] = obj;
1032         }
1033         rcu_read_unlock();
1034         return skb->len;
1035 }
1036
1037 static const struct genl_ops dp_flow_genl_ops[] = {
1038         { .cmd = OVS_FLOW_CMD_NEW,
1039           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1040           .policy = flow_policy,
1041           .doit = ovs_flow_cmd_new_or_set
1042         },
1043         { .cmd = OVS_FLOW_CMD_DEL,
1044           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1045           .policy = flow_policy,
1046           .doit = ovs_flow_cmd_del
1047         },
1048         { .cmd = OVS_FLOW_CMD_GET,
1049           .flags = 0,               /* OK for unprivileged users. */
1050           .policy = flow_policy,
1051           .doit = ovs_flow_cmd_get,
1052           .dumpit = ovs_flow_cmd_dump
1053         },
1054         { .cmd = OVS_FLOW_CMD_SET,
1055           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1056           .policy = flow_policy,
1057           .doit = ovs_flow_cmd_new_or_set,
1058         },
1059 };
1060
1061 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1062         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1063         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1064 };
1065
1066 static struct genl_family dp_datapath_genl_family = {
1067         .id = GENL_ID_GENERATE,
1068         .hdrsize = sizeof(struct ovs_header),
1069         .name = OVS_DATAPATH_FAMILY,
1070         .version = OVS_DATAPATH_VERSION,
1071         .maxattr = OVS_DP_ATTR_MAX,
1072         .netnsok = true,
1073         .parallel_ops = true,
1074 };
1075
1076 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1077         .name = OVS_DATAPATH_MCGROUP
1078 };
1079
1080 static size_t ovs_dp_cmd_msg_size(void)
1081 {
1082         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1083
1084         msgsize += nla_total_size(IFNAMSIZ);
1085         msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1086         msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1087
1088         return msgsize;
1089 }
1090
1091 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1092                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1093 {
1094         struct ovs_header *ovs_header;
1095         struct ovs_dp_stats dp_stats;
1096         struct ovs_dp_megaflow_stats dp_megaflow_stats;
1097         int err;
1098
1099         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1100                                    flags, cmd);
1101         if (!ovs_header)
1102                 goto error;
1103
1104         ovs_header->dp_ifindex = get_dpifindex(dp);
1105
1106         rcu_read_lock();
1107         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1108         rcu_read_unlock();
1109         if (err)
1110                 goto nla_put_failure;
1111
1112         get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1113         if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1114                         &dp_stats))
1115                 goto nla_put_failure;
1116
1117         if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1118                         sizeof(struct ovs_dp_megaflow_stats),
1119                         &dp_megaflow_stats))
1120                 goto nla_put_failure;
1121
1122         return genlmsg_end(skb, ovs_header);
1123
1124 nla_put_failure:
1125         genlmsg_cancel(skb, ovs_header);
1126 error:
1127         return -EMSGSIZE;
1128 }
1129
1130 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
1131                                              u32 seq, u8 cmd)
1132 {
1133         struct sk_buff *skb;
1134         int retval;
1135
1136         skb = genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1137         if (!skb)
1138                 return ERR_PTR(-ENOMEM);
1139
1140         retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
1141         if (retval < 0) {
1142                 kfree_skb(skb);
1143                 return ERR_PTR(retval);
1144         }
1145         return skb;
1146 }
1147
1148 /* Called with ovs_mutex. */
1149 static struct datapath *lookup_datapath(struct net *net,
1150                                         struct ovs_header *ovs_header,
1151                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1152 {
1153         struct datapath *dp;
1154
1155         if (!a[OVS_DP_ATTR_NAME])
1156                 dp = get_dp(net, ovs_header->dp_ifindex);
1157         else {
1158                 struct vport *vport;
1159
1160                 rcu_read_lock();
1161                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1162                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1163                 rcu_read_unlock();
1164         }
1165         return dp ? dp : ERR_PTR(-ENODEV);
1166 }
1167
1168 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1169 {
1170         struct nlattr **a = info->attrs;
1171         struct vport_parms parms;
1172         struct sk_buff *reply;
1173         struct datapath *dp;
1174         struct vport *vport;
1175         struct ovs_net *ovs_net;
1176         int err, i;
1177
1178         err = -EINVAL;
1179         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1180                 goto err;
1181
1182         ovs_lock();
1183
1184         err = -ENOMEM;
1185         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1186         if (dp == NULL)
1187                 goto err_unlock_ovs;
1188
1189         ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1190
1191         /* Allocate table. */
1192         err = ovs_flow_tbl_init(&dp->table);
1193         if (err)
1194                 goto err_free_dp;
1195
1196         dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1197         if (!dp->stats_percpu) {
1198                 err = -ENOMEM;
1199                 goto err_destroy_table;
1200         }
1201
1202         for_each_possible_cpu(i) {
1203                 struct dp_stats_percpu *dpath_stats;
1204                 dpath_stats = per_cpu_ptr(dp->stats_percpu, i);
1205                 u64_stats_init(&dpath_stats->sync);
1206         }
1207
1208         dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1209                             GFP_KERNEL);
1210         if (!dp->ports) {
1211                 err = -ENOMEM;
1212                 goto err_destroy_percpu;
1213         }
1214
1215         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1216                 INIT_HLIST_HEAD(&dp->ports[i]);
1217
1218         /* Set up our datapath device. */
1219         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1220         parms.type = OVS_VPORT_TYPE_INTERNAL;
1221         parms.options = NULL;
1222         parms.dp = dp;
1223         parms.port_no = OVSP_LOCAL;
1224         parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1225
1226         vport = new_vport(&parms);
1227         if (IS_ERR(vport)) {
1228                 err = PTR_ERR(vport);
1229                 if (err == -EBUSY)
1230                         err = -EEXIST;
1231
1232                 goto err_destroy_ports_array;
1233         }
1234
1235         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1236                                       info->snd_seq, OVS_DP_CMD_NEW);
1237         err = PTR_ERR(reply);
1238         if (IS_ERR(reply))
1239                 goto err_destroy_local_port;
1240
1241         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1242         list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1243
1244         ovs_unlock();
1245
1246         ovs_notify(&dp_datapath_genl_family, reply, info);
1247         return 0;
1248
1249 err_destroy_local_port:
1250         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1251 err_destroy_ports_array:
1252         kfree(dp->ports);
1253 err_destroy_percpu:
1254         free_percpu(dp->stats_percpu);
1255 err_destroy_table:
1256         ovs_flow_tbl_destroy(&dp->table);
1257 err_free_dp:
1258         release_net(ovs_dp_get_net(dp));
1259         kfree(dp);
1260 err_unlock_ovs:
1261         ovs_unlock();
1262 err:
1263         return err;
1264 }
1265
1266 /* Called with ovs_mutex. */
1267 static void __dp_destroy(struct datapath *dp)
1268 {
1269         int i;
1270
1271         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1272                 struct vport *vport;
1273                 struct hlist_node *n;
1274
1275                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1276                         if (vport->port_no != OVSP_LOCAL)
1277                                 ovs_dp_detach_port(vport);
1278         }
1279
1280         list_del_rcu(&dp->list_node);
1281
1282         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1283          * all port in datapath are destroyed first before freeing datapath.
1284          */
1285         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1286
1287         call_rcu(&dp->rcu, destroy_dp_rcu);
1288 }
1289
1290 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1291 {
1292         struct sk_buff *reply;
1293         struct datapath *dp;
1294         int err;
1295
1296         ovs_lock();
1297         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1298         err = PTR_ERR(dp);
1299         if (IS_ERR(dp))
1300                 goto unlock;
1301
1302         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1303                                       info->snd_seq, OVS_DP_CMD_DEL);
1304         err = PTR_ERR(reply);
1305         if (IS_ERR(reply))
1306                 goto unlock;
1307
1308         __dp_destroy(dp);
1309         ovs_unlock();
1310
1311         ovs_notify(&dp_datapath_genl_family, reply, info);
1312
1313         return 0;
1314 unlock:
1315         ovs_unlock();
1316         return err;
1317 }
1318
1319 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1320 {
1321         struct sk_buff *reply;
1322         struct datapath *dp;
1323         int err;
1324
1325         ovs_lock();
1326         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1327         err = PTR_ERR(dp);
1328         if (IS_ERR(dp))
1329                 goto unlock;
1330
1331         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1332                                       info->snd_seq, OVS_DP_CMD_NEW);
1333         if (IS_ERR(reply)) {
1334                 err = PTR_ERR(reply);
1335                 genl_set_err(&dp_datapath_genl_family, sock_net(skb->sk), 0,
1336                              0, err);
1337                 err = 0;
1338                 goto unlock;
1339         }
1340
1341         ovs_unlock();
1342         ovs_notify(&dp_datapath_genl_family, reply, info);
1343
1344         return 0;
1345 unlock:
1346         ovs_unlock();
1347         return err;
1348 }
1349
1350 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1351 {
1352         struct sk_buff *reply;
1353         struct datapath *dp;
1354         int err;
1355
1356         ovs_lock();
1357         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1358         if (IS_ERR(dp)) {
1359                 err = PTR_ERR(dp);
1360                 goto unlock;
1361         }
1362
1363         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1364                                       info->snd_seq, OVS_DP_CMD_NEW);
1365         if (IS_ERR(reply)) {
1366                 err = PTR_ERR(reply);
1367                 goto unlock;
1368         }
1369
1370         ovs_unlock();
1371         return genlmsg_reply(reply, info);
1372
1373 unlock:
1374         ovs_unlock();
1375         return err;
1376 }
1377
1378 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1379 {
1380         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1381         struct datapath *dp;
1382         int skip = cb->args[0];
1383         int i = 0;
1384
1385         rcu_read_lock();
1386         list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1387                 if (i >= skip &&
1388                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1389                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1390                                          OVS_DP_CMD_NEW) < 0)
1391                         break;
1392                 i++;
1393         }
1394         rcu_read_unlock();
1395
1396         cb->args[0] = i;
1397
1398         return skb->len;
1399 }
1400
1401 static const struct genl_ops dp_datapath_genl_ops[] = {
1402         { .cmd = OVS_DP_CMD_NEW,
1403           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1404           .policy = datapath_policy,
1405           .doit = ovs_dp_cmd_new
1406         },
1407         { .cmd = OVS_DP_CMD_DEL,
1408           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1409           .policy = datapath_policy,
1410           .doit = ovs_dp_cmd_del
1411         },
1412         { .cmd = OVS_DP_CMD_GET,
1413           .flags = 0,               /* OK for unprivileged users. */
1414           .policy = datapath_policy,
1415           .doit = ovs_dp_cmd_get,
1416           .dumpit = ovs_dp_cmd_dump
1417         },
1418         { .cmd = OVS_DP_CMD_SET,
1419           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1420           .policy = datapath_policy,
1421           .doit = ovs_dp_cmd_set,
1422         },
1423 };
1424
1425 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1426         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1427         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1428         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1429         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1430         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1431         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1432 };
1433
1434 struct genl_family dp_vport_genl_family = {
1435         .id = GENL_ID_GENERATE,
1436         .hdrsize = sizeof(struct ovs_header),
1437         .name = OVS_VPORT_FAMILY,
1438         .version = OVS_VPORT_VERSION,
1439         .maxattr = OVS_VPORT_ATTR_MAX,
1440         .netnsok = true,
1441         .parallel_ops = true,
1442 };
1443
1444 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1445         .name = OVS_VPORT_MCGROUP
1446 };
1447
1448 /* Called with ovs_mutex or RCU read lock. */
1449 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1450                                    u32 portid, u32 seq, u32 flags, u8 cmd)
1451 {
1452         struct ovs_header *ovs_header;
1453         struct ovs_vport_stats vport_stats;
1454         int err;
1455
1456         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1457                                  flags, cmd);
1458         if (!ovs_header)
1459                 return -EMSGSIZE;
1460
1461         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1462
1463         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1464             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1465             nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1466             nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
1467                 goto nla_put_failure;
1468
1469         ovs_vport_get_stats(vport, &vport_stats);
1470         if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1471                     &vport_stats))
1472                 goto nla_put_failure;
1473
1474         err = ovs_vport_get_options(vport, skb);
1475         if (err == -EMSGSIZE)
1476                 goto error;
1477
1478         return genlmsg_end(skb, ovs_header);
1479
1480 nla_put_failure:
1481         err = -EMSGSIZE;
1482 error:
1483         genlmsg_cancel(skb, ovs_header);
1484         return err;
1485 }
1486
1487 /* Called with ovs_mutex or RCU read lock. */
1488 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1489                                          u32 seq, u8 cmd)
1490 {
1491         struct sk_buff *skb;
1492         int retval;
1493
1494         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1495         if (!skb)
1496                 return ERR_PTR(-ENOMEM);
1497
1498         retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1499         BUG_ON(retval < 0);
1500
1501         return skb;
1502 }
1503
1504 /* Called with ovs_mutex or RCU read lock. */
1505 static struct vport *lookup_vport(struct net *net,
1506                                   struct ovs_header *ovs_header,
1507                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1508 {
1509         struct datapath *dp;
1510         struct vport *vport;
1511
1512         if (a[OVS_VPORT_ATTR_NAME]) {
1513                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1514                 if (!vport)
1515                         return ERR_PTR(-ENODEV);
1516                 if (ovs_header->dp_ifindex &&
1517                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1518                         return ERR_PTR(-ENODEV);
1519                 return vport;
1520         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1521                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1522
1523                 if (port_no >= DP_MAX_PORTS)
1524                         return ERR_PTR(-EFBIG);
1525
1526                 dp = get_dp(net, ovs_header->dp_ifindex);
1527                 if (!dp)
1528                         return ERR_PTR(-ENODEV);
1529
1530                 vport = ovs_vport_ovsl_rcu(dp, port_no);
1531                 if (!vport)
1532                         return ERR_PTR(-ENODEV);
1533                 return vport;
1534         } else
1535                 return ERR_PTR(-EINVAL);
1536 }
1537
1538 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1539 {
1540         struct nlattr **a = info->attrs;
1541         struct ovs_header *ovs_header = info->userhdr;
1542         struct vport_parms parms;
1543         struct sk_buff *reply;
1544         struct vport *vport;
1545         struct datapath *dp;
1546         u32 port_no;
1547         int err;
1548
1549         err = -EINVAL;
1550         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1551             !a[OVS_VPORT_ATTR_UPCALL_PID])
1552                 goto exit;
1553
1554         ovs_lock();
1555         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1556         err = -ENODEV;
1557         if (!dp)
1558                 goto exit_unlock;
1559
1560         if (a[OVS_VPORT_ATTR_PORT_NO]) {
1561                 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1562
1563                 err = -EFBIG;
1564                 if (port_no >= DP_MAX_PORTS)
1565                         goto exit_unlock;
1566
1567                 vport = ovs_vport_ovsl(dp, port_no);
1568                 err = -EBUSY;
1569                 if (vport)
1570                         goto exit_unlock;
1571         } else {
1572                 for (port_no = 1; ; port_no++) {
1573                         if (port_no >= DP_MAX_PORTS) {
1574                                 err = -EFBIG;
1575                                 goto exit_unlock;
1576                         }
1577                         vport = ovs_vport_ovsl(dp, port_no);
1578                         if (!vport)
1579                                 break;
1580                 }
1581         }
1582
1583         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1584         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1585         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1586         parms.dp = dp;
1587         parms.port_no = port_no;
1588         parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1589
1590         vport = new_vport(&parms);
1591         err = PTR_ERR(vport);
1592         if (IS_ERR(vport))
1593                 goto exit_unlock;
1594
1595         err = 0;
1596         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1597                                          OVS_VPORT_CMD_NEW);
1598         if (IS_ERR(reply)) {
1599                 err = PTR_ERR(reply);
1600                 ovs_dp_detach_port(vport);
1601                 goto exit_unlock;
1602         }
1603
1604         ovs_notify(&dp_vport_genl_family, reply, info);
1605
1606 exit_unlock:
1607         ovs_unlock();
1608 exit:
1609         return err;
1610 }
1611
1612 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1613 {
1614         struct nlattr **a = info->attrs;
1615         struct sk_buff *reply;
1616         struct vport *vport;
1617         int err;
1618
1619         ovs_lock();
1620         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1621         err = PTR_ERR(vport);
1622         if (IS_ERR(vport))
1623                 goto exit_unlock;
1624
1625         if (a[OVS_VPORT_ATTR_TYPE] &&
1626             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1627                 err = -EINVAL;
1628                 goto exit_unlock;
1629         }
1630
1631         reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1632         if (!reply) {
1633                 err = -ENOMEM;
1634                 goto exit_unlock;
1635         }
1636
1637         if (a[OVS_VPORT_ATTR_OPTIONS]) {
1638                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1639                 if (err)
1640                         goto exit_free;
1641         }
1642
1643         if (a[OVS_VPORT_ATTR_UPCALL_PID])
1644                 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1645
1646         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1647                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1648         BUG_ON(err < 0);
1649
1650         ovs_unlock();
1651         ovs_notify(&dp_vport_genl_family, reply, info);
1652         return 0;
1653
1654 exit_free:
1655         kfree_skb(reply);
1656 exit_unlock:
1657         ovs_unlock();
1658         return err;
1659 }
1660
1661 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1662 {
1663         struct nlattr **a = info->attrs;
1664         struct sk_buff *reply;
1665         struct vport *vport;
1666         int err;
1667
1668         ovs_lock();
1669         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1670         err = PTR_ERR(vport);
1671         if (IS_ERR(vport))
1672                 goto exit_unlock;
1673
1674         if (vport->port_no == OVSP_LOCAL) {
1675                 err = -EINVAL;
1676                 goto exit_unlock;
1677         }
1678
1679         reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
1680                                          info->snd_seq, OVS_VPORT_CMD_DEL);
1681         err = PTR_ERR(reply);
1682         if (IS_ERR(reply))
1683                 goto exit_unlock;
1684
1685         err = 0;
1686         ovs_dp_detach_port(vport);
1687
1688         ovs_notify(&dp_vport_genl_family, reply, info);
1689
1690 exit_unlock:
1691         ovs_unlock();
1692         return err;
1693 }
1694
1695 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1696 {
1697         struct nlattr **a = info->attrs;
1698         struct ovs_header *ovs_header = info->userhdr;
1699         struct sk_buff *reply;
1700         struct vport *vport;
1701         int err;
1702
1703         rcu_read_lock();
1704         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1705         err = PTR_ERR(vport);
1706         if (IS_ERR(vport))
1707                 goto exit_unlock;
1708
1709         reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
1710                                          info->snd_seq, OVS_VPORT_CMD_NEW);
1711         err = PTR_ERR(reply);
1712         if (IS_ERR(reply))
1713                 goto exit_unlock;
1714
1715         rcu_read_unlock();
1716
1717         return genlmsg_reply(reply, info);
1718
1719 exit_unlock:
1720         rcu_read_unlock();
1721         return err;
1722 }
1723
1724 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1725 {
1726         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1727         struct datapath *dp;
1728         int bucket = cb->args[0], skip = cb->args[1];
1729         int i, j = 0;
1730
1731         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1732         if (!dp)
1733                 return -ENODEV;
1734
1735         rcu_read_lock();
1736         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1737                 struct vport *vport;
1738
1739                 j = 0;
1740                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1741                         if (j >= skip &&
1742                             ovs_vport_cmd_fill_info(vport, skb,
1743                                                     NETLINK_CB(cb->skb).portid,
1744                                                     cb->nlh->nlmsg_seq,
1745                                                     NLM_F_MULTI,
1746                                                     OVS_VPORT_CMD_NEW) < 0)
1747                                 goto out;
1748
1749                         j++;
1750                 }
1751                 skip = 0;
1752         }
1753 out:
1754         rcu_read_unlock();
1755
1756         cb->args[0] = i;
1757         cb->args[1] = j;
1758
1759         return skb->len;
1760 }
1761
1762 static const struct genl_ops dp_vport_genl_ops[] = {
1763         { .cmd = OVS_VPORT_CMD_NEW,
1764           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1765           .policy = vport_policy,
1766           .doit = ovs_vport_cmd_new
1767         },
1768         { .cmd = OVS_VPORT_CMD_DEL,
1769           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1770           .policy = vport_policy,
1771           .doit = ovs_vport_cmd_del
1772         },
1773         { .cmd = OVS_VPORT_CMD_GET,
1774           .flags = 0,               /* OK for unprivileged users. */
1775           .policy = vport_policy,
1776           .doit = ovs_vport_cmd_get,
1777           .dumpit = ovs_vport_cmd_dump
1778         },
1779         { .cmd = OVS_VPORT_CMD_SET,
1780           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1781           .policy = vport_policy,
1782           .doit = ovs_vport_cmd_set,
1783         },
1784 };
1785
1786 struct genl_family_and_ops {
1787         struct genl_family *family;
1788         const struct genl_ops *ops;
1789         int n_ops;
1790         const struct genl_multicast_group *group;
1791 };
1792
1793 static const struct genl_family_and_ops dp_genl_families[] = {
1794         { &dp_datapath_genl_family,
1795           dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1796           &ovs_dp_datapath_multicast_group },
1797         { &dp_vport_genl_family,
1798           dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1799           &ovs_dp_vport_multicast_group },
1800         { &dp_flow_genl_family,
1801           dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1802           &ovs_dp_flow_multicast_group },
1803         { &dp_packet_genl_family,
1804           dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1805           NULL },
1806 };
1807
1808 static void dp_unregister_genl(int n_families)
1809 {
1810         int i;
1811
1812         for (i = 0; i < n_families; i++)
1813                 genl_unregister_family(dp_genl_families[i].family);
1814 }
1815
1816 static int dp_register_genl(void)
1817 {
1818         int n_registered;
1819         int err;
1820         int i;
1821
1822         n_registered = 0;
1823         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1824                 const struct genl_family_and_ops *f = &dp_genl_families[i];
1825
1826                 f->family->ops = f->ops;
1827                 f->family->n_ops = f->n_ops;
1828                 f->family->mcgrps = f->group;
1829                 f->family->n_mcgrps = f->group ? 1 : 0;
1830                 err = genl_register_family(f->family);
1831                 if (err)
1832                         goto error;
1833                 n_registered++;
1834         }
1835
1836         return 0;
1837
1838 error:
1839         dp_unregister_genl(n_registered);
1840         return err;
1841 }
1842
1843 static int __net_init ovs_init_net(struct net *net)
1844 {
1845         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1846
1847         INIT_LIST_HEAD(&ovs_net->dps);
1848         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
1849         return 0;
1850 }
1851
1852 static void __net_exit ovs_exit_net(struct net *net)
1853 {
1854         struct datapath *dp, *dp_next;
1855         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1856
1857         ovs_lock();
1858         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
1859                 __dp_destroy(dp);
1860         ovs_unlock();
1861
1862         cancel_work_sync(&ovs_net->dp_notify_work);
1863 }
1864
1865 static struct pernet_operations ovs_net_ops = {
1866         .init = ovs_init_net,
1867         .exit = ovs_exit_net,
1868         .id   = &ovs_net_id,
1869         .size = sizeof(struct ovs_net),
1870 };
1871
1872 static int __init dp_init(void)
1873 {
1874         int err;
1875
1876         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
1877
1878         pr_info("Open vSwitch switching datapath\n");
1879
1880         err = ovs_flow_init();
1881         if (err)
1882                 goto error;
1883
1884         err = ovs_vport_init();
1885         if (err)
1886                 goto error_flow_exit;
1887
1888         err = register_pernet_device(&ovs_net_ops);
1889         if (err)
1890                 goto error_vport_exit;
1891
1892         err = register_netdevice_notifier(&ovs_dp_device_notifier);
1893         if (err)
1894                 goto error_netns_exit;
1895
1896         err = dp_register_genl();
1897         if (err < 0)
1898                 goto error_unreg_notifier;
1899
1900         return 0;
1901
1902 error_unreg_notifier:
1903         unregister_netdevice_notifier(&ovs_dp_device_notifier);
1904 error_netns_exit:
1905         unregister_pernet_device(&ovs_net_ops);
1906 error_vport_exit:
1907         ovs_vport_exit();
1908 error_flow_exit:
1909         ovs_flow_exit();
1910 error:
1911         return err;
1912 }
1913
1914 static void dp_cleanup(void)
1915 {
1916         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
1917         unregister_netdevice_notifier(&ovs_dp_device_notifier);
1918         unregister_pernet_device(&ovs_net_ops);
1919         rcu_barrier();
1920         ovs_vport_exit();
1921         ovs_flow_exit();
1922 }
1923
1924 module_init(dp_init);
1925 module_exit(dp_cleanup);
1926
1927 MODULE_DESCRIPTION("Open vSwitch switching datapath");
1928 MODULE_LICENSE("GPL");