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_check(flow->sf_acts,
 699                                                 lockdep_ovsl_is_held());
 700
 701                 err = ovs_nla_put_actions(sf_acts->actions,
 702                                           sf_acts->actions_len, skb);
 703                 if (!err)
 704                         nla_nest_end(skb, start);
 705                 else {
 706                         if (skb_orig_len)
 707                                 goto error;
 708
 709                         nla_nest_cancel(skb, start);
 710                 }
 711         } else if (skb_orig_len)
 712                 goto nla_put_failure;
 713
 714         return genlmsg_end(skb, ovs_header);
 715
 716 nla_put_failure:
 717         err = -EMSGSIZE;
 718 error:
 719         genlmsg_cancel(skb, ovs_header);
 720         return err;
 721 }
 722
 723 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
 724 {
 725         const struct sw_flow_actions *sf_acts;
 726
 727         sf_acts = ovsl_dereference(flow->sf_acts);
 728
 729         return genlmsg_new(ovs_flow_cmd_msg_size(sf_acts), GFP_KERNEL);
 730 }
 731
 732 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
 733                                                struct datapath *dp,
 734                                                u32 portid, u32 seq, u8 cmd)
 735 {
 736         struct sk_buff *skb;
 737         int retval;
 738
 739         skb = ovs_flow_cmd_alloc_info(flow);
 740         if (!skb)
 741                 return ERR_PTR(-ENOMEM);
 742
 743         retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
 744         BUG_ON(retval < 0);
 745         return skb;
 746 }
 747
 748 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
 749 {
 750         struct nlattr **a = info->attrs;
 751         struct ovs_header *ovs_header = info->userhdr;
 752         struct sw_flow_key key, masked_key;
 753         struct sw_flow *flow = NULL;
 754         struct sw_flow_mask mask;
 755         struct sk_buff *reply;
 756         struct datapath *dp;
 757         struct sw_flow_actions *acts = NULL;
 758         struct sw_flow_match match;
 759         int error;
 760
 761         /* Extract key. */
 762         error = -EINVAL;
 763         if (!a[OVS_FLOW_ATTR_KEY])
 764                 goto error;
 765
 766         ovs_match_init(&match, &key, &mask);
 767         error = ovs_nla_get_match(&match,
 768                                   a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
 769         if (error)
 770                 goto error;
 771
 772         /* Validate actions. */
 773         if (a[OVS_FLOW_ATTR_ACTIONS]) {
 774                 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
 775                 error = PTR_ERR(acts);
 776                 if (IS_ERR(acts))
 777                         goto error;
 778
 779                 ovs_flow_mask_key(&masked_key, &key, &mask);
 780                 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS],
 781                                              &masked_key, 0, &acts);
 782                 if (error) {
 783                         OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
 784                         goto err_kfree;
 785                 }
 786         } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
 787                 error = -EINVAL;
 788                 goto error;
 789         }
 790
 791         ovs_lock();
 792         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 793         error = -ENODEV;
 794         if (!dp)
 795                 goto err_unlock_ovs;
 796
 797         /* Check if this is a duplicate flow */
 798         flow = ovs_flow_tbl_lookup(&dp->table, &key);
 799         if (!flow) {
 800                 /* Bail out if we're not allowed to create a new flow. */
 801                 error = -ENOENT;
 802                 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
 803                         goto err_unlock_ovs;
 804
 805                 /* Allocate flow. */
 806                 flow = ovs_flow_alloc();
 807                 if (IS_ERR(flow)) {
 808                         error = PTR_ERR(flow);
 809                         goto err_unlock_ovs;
 810                 }
 811
 812                 flow->key = masked_key;
 813                 flow->unmasked_key = key;
 814                 rcu_assign_pointer(flow->sf_acts, acts);
 815
 816                 /* Put flow in bucket. */
 817                 error = ovs_flow_tbl_insert(&dp->table, flow, &mask);
 818                 if (error) {
 819                         acts = NULL;
 820                         goto err_flow_free;
 821                 }
 822
 823                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
 824                                                 info->snd_seq, OVS_FLOW_CMD_NEW);
 825         } else {
 826                 /* We found a matching flow. */
 827                 struct sw_flow_actions *old_acts;
 828
 829                 /* Bail out if we're not allowed to modify an existing flow.
 830                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
 831                  * because Generic Netlink treats the latter as a dump
 832                  * request.  We also accept NLM_F_EXCL in case that bug ever
 833                  * gets fixed.
 834                  */
 835                 error = -EEXIST;
 836                 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
 837                     info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
 838                         goto err_unlock_ovs;
 839
 840                 /* The unmasked key has to be the same for flow updates. */
 841                 error = -EINVAL;
 842                 if (!ovs_flow_cmp_unmasked_key(flow, &match)) {
 843                         OVS_NLERR("Flow modification message rejected, unmasked key does not match.\n");
 844                         goto err_unlock_ovs;
 845                 }
 846
 847                 /* Update actions. */
 848                 old_acts = ovsl_dereference(flow->sf_acts);
 849                 rcu_assign_pointer(flow->sf_acts, acts);
 850                 ovs_nla_free_flow_actions(old_acts);
 851
 852                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
 853                                                info->snd_seq, OVS_FLOW_CMD_NEW);
 854
 855                 /* Clear stats. */
 856                 if (a[OVS_FLOW_ATTR_CLEAR])
 857                         ovs_flow_stats_clear(flow);
 858         }
 859         ovs_unlock();
 860
 861         if (!IS_ERR(reply))
 862                 ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
 863         else
 864                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
 865                                 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
 866         return 0;
 867
 868 err_flow_free:
 869         ovs_flow_free(flow, false);
 870 err_unlock_ovs:
 871         ovs_unlock();
 872 err_kfree:
 873         kfree(acts);
 874 error:
 875         return error;
 876 }
 877
 878 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
 879 {
 880         struct nlattr **a = info->attrs;
 881         struct ovs_header *ovs_header = info->userhdr;
 882         struct sw_flow_key key;
 883         struct sk_buff *reply;
 884         struct sw_flow *flow;
 885         struct datapath *dp;
 886         struct sw_flow_match match;
 887         int err;
 888
 889         if (!a[OVS_FLOW_ATTR_KEY]) {
 890                 OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
 891                 return -EINVAL;
 892         }
 893
 894         ovs_match_init(&match, &key, NULL);
 895         err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
 896         if (err)
 897                 return err;
 898
 899         ovs_lock();
 900         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 901         if (!dp) {
 902                 err = -ENODEV;
 903                 goto unlock;
 904         }
 905
 906         flow = ovs_flow_tbl_lookup(&dp->table, &key);
 907         if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) {
 908                 err = -ENOENT;
 909                 goto unlock;
 910         }
 911
 912         reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
 913                                         info->snd_seq, OVS_FLOW_CMD_NEW);
 914         if (IS_ERR(reply)) {
 915                 err = PTR_ERR(reply);
 916                 goto unlock;
 917         }
 918
 919         ovs_unlock();
 920         return genlmsg_reply(reply, info);
 921 unlock:
 922         ovs_unlock();
 923         return err;
 924 }
 925
 926 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
 927 {
 928         struct nlattr **a = info->attrs;
 929         struct ovs_header *ovs_header = info->userhdr;
 930         struct sw_flow_key key;
 931         struct sk_buff *reply;
 932         struct sw_flow *flow;
 933         struct datapath *dp;
 934         struct sw_flow_match match;
 935         int err;
 936
 937         ovs_lock();
 938         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 939         if (!dp) {
 940                 err = -ENODEV;
 941                 goto unlock;
 942         }
 943
 944         if (!a[OVS_FLOW_ATTR_KEY]) {
 945                 err = ovs_flow_tbl_flush(&dp->table);
 946                 goto unlock;
 947         }
 948
 949         ovs_match_init(&match, &key, NULL);
 950         err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
 951         if (err)
 952                 goto unlock;
 953
 954         flow = ovs_flow_tbl_lookup(&dp->table, &key);
 955         if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) {
 956                 err = -ENOENT;
 957                 goto unlock;
 958         }
 959
 960         reply = ovs_flow_cmd_alloc_info(flow);
 961         if (!reply) {
 962                 err = -ENOMEM;
 963                 goto unlock;
 964         }
 965
 966         ovs_flow_tbl_remove(&dp->table, flow);
 967
 968         err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
 969                                      info->snd_seq, 0, OVS_FLOW_CMD_DEL);
 970         BUG_ON(err < 0);
 971
 972         ovs_flow_free(flow, true);
 973         ovs_unlock();
 974
 975         ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
 976         return 0;
 977 unlock:
 978         ovs_unlock();
 979         return err;
 980 }
 981
 982 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
 983 {
 984         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
 985         struct table_instance *ti;
 986         struct datapath *dp;
 987
 988         rcu_read_lock();
 989         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 990         if (!dp) {
 991                 rcu_read_unlock();
 992                 return -ENODEV;
 993         }
 994
 995         ti = rcu_dereference(dp->table.ti);
 996         for (;;) {
 997                 struct sw_flow *flow;
 998                 u32 bucket, obj;
 999
1000                 bucket = cb->args[0];
1001                 obj = cb->args[1];
1002                 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1003                 if (!flow)
1004                         break;
1005
1006                 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1007                                            NETLINK_CB(cb->skb).portid,
1008                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1009                                            OVS_FLOW_CMD_NEW) < 0)
1010                         break;
1011
1012                 cb->args[0] = bucket;
1013                 cb->args[1] = obj;
1014         }
1015         rcu_read_unlock();
1016         return skb->len;
1017 }
1018
1019 static struct genl_ops dp_flow_genl_ops[] = {
1020         { .cmd = OVS_FLOW_CMD_NEW,
1021           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1022           .policy = flow_policy,
1023           .doit = ovs_flow_cmd_new_or_set
1024         },
1025         { .cmd = OVS_FLOW_CMD_DEL,
1026           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1027           .policy = flow_policy,
1028           .doit = ovs_flow_cmd_del
1029         },
1030         { .cmd = OVS_FLOW_CMD_GET,
1031           .flags = 0,               /* OK for unprivileged users. */
1032           .policy = flow_policy,
1033           .doit = ovs_flow_cmd_get,
1034           .dumpit = ovs_flow_cmd_dump
1035         },
1036         { .cmd = OVS_FLOW_CMD_SET,
1037           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1038           .policy = flow_policy,
1039           .doit = ovs_flow_cmd_new_or_set,
1040         },
1041 };
1042
1043 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1044         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1045         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1046 };
1047
1048 static struct genl_family dp_datapath_genl_family = {
1049         .id = GENL_ID_GENERATE,
1050         .hdrsize = sizeof(struct ovs_header),
1051         .name = OVS_DATAPATH_FAMILY,
1052         .version = OVS_DATAPATH_VERSION,
1053         .maxattr = OVS_DP_ATTR_MAX,
1054         .netnsok = true,
1055          SET_PARALLEL_OPS
1056 };
1057
1058 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1059         .name = OVS_DATAPATH_MCGROUP
1060 };
1061
1062 static size_t ovs_dp_cmd_msg_size(void)
1063 {
1064         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1065
1066         msgsize += nla_total_size(IFNAMSIZ);
1067         msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1068         msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1069
1070         return msgsize;
1071 }
1072
1073 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1074                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1075 {
1076         struct ovs_header *ovs_header;
1077         struct ovs_dp_stats dp_stats;
1078         struct ovs_dp_megaflow_stats dp_megaflow_stats;
1079         int err;
1080
1081         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1082                                    flags, cmd);
1083         if (!ovs_header)
1084                 goto error;
1085
1086         ovs_header->dp_ifindex = get_dpifindex(dp);
1087
1088         rcu_read_lock();
1089         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1090         rcu_read_unlock();
1091         if (err)
1092                 goto nla_put_failure;
1093
1094         get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1095         if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1096                         &dp_stats))
1097                 goto nla_put_failure;
1098
1099         if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1100                         sizeof(struct ovs_dp_megaflow_stats),
1101                         &dp_megaflow_stats))
1102                 goto nla_put_failure;
1103
1104         return genlmsg_end(skb, ovs_header);
1105
1106 nla_put_failure:
1107         genlmsg_cancel(skb, ovs_header);
1108 error:
1109         return -EMSGSIZE;
1110 }
1111
1112 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
1113                                              u32 seq, u8 cmd)
1114 {
1115         struct sk_buff *skb;
1116         int retval;
1117
1118         skb = genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1119         if (!skb)
1120                 return ERR_PTR(-ENOMEM);
1121
1122         retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
1123         if (retval < 0) {
1124                 kfree_skb(skb);
1125                 return ERR_PTR(retval);
1126         }
1127         return skb;
1128 }
1129
1130 /* Called with ovs_mutex. */
1131 static struct datapath *lookup_datapath(struct net *net,
1132                                         struct ovs_header *ovs_header,
1133                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1134 {
1135         struct datapath *dp;
1136
1137         if (!a[OVS_DP_ATTR_NAME])
1138                 dp = get_dp(net, ovs_header->dp_ifindex);
1139         else {
1140                 struct vport *vport;
1141
1142                 rcu_read_lock();
1143                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1144                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1145                 rcu_read_unlock();
1146         }
1147         return dp ? dp : ERR_PTR(-ENODEV);
1148 }
1149
1150 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1151 {
1152         struct nlattr **a = info->attrs;
1153         struct vport_parms parms;
1154         struct sk_buff *reply;
1155         struct datapath *dp;
1156         struct vport *vport;
1157         struct ovs_net *ovs_net;
1158         int err, i;
1159
1160         err = -EINVAL;
1161         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1162                 goto err;
1163
1164         ovs_lock();
1165
1166         err = -ENOMEM;
1167         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1168         if (dp == NULL)
1169                 goto err_unlock_ovs;
1170
1171         ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1172
1173         /* Allocate table. */
1174         err = ovs_flow_tbl_init(&dp->table);
1175         if (err)
1176                 goto err_free_dp;
1177
1178         dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1179         if (!dp->stats_percpu) {
1180                 err = -ENOMEM;
1181                 goto err_destroy_table;
1182         }
1183
1184         dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1185                             GFP_KERNEL);
1186         if (!dp->ports) {
1187                 err = -ENOMEM;
1188                 goto err_destroy_percpu;
1189         }
1190
1191         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1192                 INIT_HLIST_HEAD(&dp->ports[i]);
1193
1194         /* Set up our datapath device. */
1195         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1196         parms.type = OVS_VPORT_TYPE_INTERNAL;
1197         parms.options = NULL;
1198         parms.dp = dp;
1199         parms.port_no = OVSP_LOCAL;
1200         parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1201
1202         vport = new_vport(&parms);
1203         if (IS_ERR(vport)) {
1204                 err = PTR_ERR(vport);
1205                 if (err == -EBUSY)
1206                         err = -EEXIST;
1207
1208                 goto err_destroy_ports_array;
1209         }
1210
1211         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1212                                       info->snd_seq, OVS_DP_CMD_NEW);
1213         err = PTR_ERR(reply);
1214         if (IS_ERR(reply))
1215                 goto err_destroy_local_port;
1216
1217         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1218         list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1219
1220         ovs_unlock();
1221
1222         ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1223         return 0;
1224
1225 err_destroy_local_port:
1226         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1227 err_destroy_ports_array:
1228         kfree(dp->ports);
1229 err_destroy_percpu:
1230         free_percpu(dp->stats_percpu);
1231 err_destroy_table:
1232         ovs_flow_tbl_destroy(&dp->table);
1233 err_free_dp:
1234         release_net(ovs_dp_get_net(dp));
1235         kfree(dp);
1236 err_unlock_ovs:
1237         ovs_unlock();
1238 err:
1239         return err;
1240 }
1241
1242 /* Called with ovs_mutex. */
1243 static void __dp_destroy(struct datapath *dp)
1244 {
1245         int i;
1246
1247         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1248                 struct vport *vport;
1249                 struct hlist_node *n;
1250
1251                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1252                         if (vport->port_no != OVSP_LOCAL)
1253                                 ovs_dp_detach_port(vport);
1254         }
1255
1256         list_del_rcu(&dp->list_node);
1257
1258         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1259          * all port in datapath are destroyed first before freeing datapath.
1260          */
1261         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1262
1263         call_rcu(&dp->rcu, destroy_dp_rcu);
1264 }
1265
1266 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1267 {
1268         struct sk_buff *reply;
1269         struct datapath *dp;
1270         int err;
1271
1272         ovs_lock();
1273         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1274         err = PTR_ERR(dp);
1275         if (IS_ERR(dp))
1276                 goto unlock;
1277
1278         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1279                                       info->snd_seq, OVS_DP_CMD_DEL);
1280         err = PTR_ERR(reply);
1281         if (IS_ERR(reply))
1282                 goto unlock;
1283
1284         __dp_destroy(dp);
1285         ovs_unlock();
1286
1287         ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1288
1289         return 0;
1290 unlock:
1291         ovs_unlock();
1292         return err;
1293 }
1294
1295 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1296 {
1297         struct sk_buff *reply;
1298         struct datapath *dp;
1299         int err;
1300
1301         ovs_lock();
1302         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1303         err = PTR_ERR(dp);
1304         if (IS_ERR(dp))
1305                 goto unlock;
1306
1307         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1308                                       info->snd_seq, OVS_DP_CMD_NEW);
1309         if (IS_ERR(reply)) {
1310                 err = PTR_ERR(reply);
1311                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1312                                 ovs_dp_datapath_multicast_group.id, err);
1313                 err = 0;
1314                 goto unlock;
1315         }
1316
1317         ovs_unlock();
1318         ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1319
1320         return 0;
1321 unlock:
1322         ovs_unlock();
1323         return err;
1324 }
1325
1326 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1327 {
1328         struct sk_buff *reply;
1329         struct datapath *dp;
1330         int err;
1331
1332         ovs_lock();
1333         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1334         if (IS_ERR(dp)) {
1335                 err = PTR_ERR(dp);
1336                 goto unlock;
1337         }
1338
1339         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1340                                       info->snd_seq, OVS_DP_CMD_NEW);
1341         if (IS_ERR(reply)) {
1342                 err = PTR_ERR(reply);
1343                 goto unlock;
1344         }
1345
1346         ovs_unlock();
1347         return genlmsg_reply(reply, info);
1348
1349 unlock:
1350         ovs_unlock();
1351         return err;
1352 }
1353
1354 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1355 {
1356         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1357         struct datapath *dp;
1358         int skip = cb->args[0];
1359         int i = 0;
1360
1361         rcu_read_lock();
1362         list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1363                 if (i >= skip &&
1364                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1365                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1366                                          OVS_DP_CMD_NEW) < 0)
1367                         break;
1368                 i++;
1369         }
1370         rcu_read_unlock();
1371
1372         cb->args[0] = i;
1373
1374         return skb->len;
1375 }
1376
1377 static struct genl_ops dp_datapath_genl_ops[] = {
1378         { .cmd = OVS_DP_CMD_NEW,
1379           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1380           .policy = datapath_policy,
1381           .doit = ovs_dp_cmd_new
1382         },
1383         { .cmd = OVS_DP_CMD_DEL,
1384           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1385           .policy = datapath_policy,
1386           .doit = ovs_dp_cmd_del
1387         },
1388         { .cmd = OVS_DP_CMD_GET,
1389           .flags = 0,               /* OK for unprivileged users. */
1390           .policy = datapath_policy,
1391           .doit = ovs_dp_cmd_get,
1392           .dumpit = ovs_dp_cmd_dump
1393         },
1394         { .cmd = OVS_DP_CMD_SET,
1395           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1396           .policy = datapath_policy,
1397           .doit = ovs_dp_cmd_set,
1398         },
1399 };
1400
1401 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1402         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1403         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1404         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1405         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1406         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1407         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1408 };
1409
1410 static struct genl_family dp_vport_genl_family = {
1411         .id = GENL_ID_GENERATE,
1412         .hdrsize = sizeof(struct ovs_header),
1413         .name = OVS_VPORT_FAMILY,
1414         .version = OVS_VPORT_VERSION,
1415         .maxattr = OVS_VPORT_ATTR_MAX,
1416         .netnsok = true,
1417          SET_PARALLEL_OPS
1418 };
1419
1420 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1421         .name = OVS_VPORT_MCGROUP
1422 };
1423
1424 /* Called with ovs_mutex or RCU read lock. */
1425 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1426                                    u32 portid, u32 seq, u32 flags, u8 cmd)
1427 {
1428         struct ovs_header *ovs_header;
1429         struct ovs_vport_stats vport_stats;
1430         int err;
1431
1432         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1433                                  flags, cmd);
1434         if (!ovs_header)
1435                 return -EMSGSIZE;
1436
1437         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1438
1439         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1440             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1441             nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1442             nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
1443                 goto nla_put_failure;
1444
1445         ovs_vport_get_stats(vport, &vport_stats);
1446         if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1447                     &vport_stats))
1448                 goto nla_put_failure;
1449
1450         err = ovs_vport_get_options(vport, skb);
1451         if (err == -EMSGSIZE)
1452                 goto error;
1453
1454         return genlmsg_end(skb, ovs_header);
1455
1456 nla_put_failure:
1457         err = -EMSGSIZE;
1458 error:
1459         genlmsg_cancel(skb, ovs_header);
1460         return err;
1461 }
1462
1463 /* Called with ovs_mutex or RCU read lock. */
1464 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1465                                          u32 seq, u8 cmd)
1466 {
1467         struct sk_buff *skb;
1468         int retval;
1469
1470         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1471         if (!skb)
1472                 return ERR_PTR(-ENOMEM);
1473
1474         retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1475         BUG_ON(retval < 0);
1476
1477         return skb;
1478 }
1479
1480 /* Called with ovs_mutex or RCU read lock. */
1481 static struct vport *lookup_vport(struct net *net,
1482                                   struct ovs_header *ovs_header,
1483                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1484 {
1485         struct datapath *dp;
1486         struct vport *vport;
1487
1488         if (a[OVS_VPORT_ATTR_NAME]) {
1489                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1490                 if (!vport)
1491                         return ERR_PTR(-ENODEV);
1492                 if (ovs_header->dp_ifindex &&
1493                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1494                         return ERR_PTR(-ENODEV);
1495                 return vport;
1496         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1497                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1498
1499                 if (port_no >= DP_MAX_PORTS)
1500                         return ERR_PTR(-EFBIG);
1501
1502                 dp = get_dp(net, ovs_header->dp_ifindex);
1503                 if (!dp)
1504                         return ERR_PTR(-ENODEV);
1505
1506                 vport = ovs_vport_ovsl_rcu(dp, port_no);
1507                 if (!vport)
1508                         return ERR_PTR(-ENODEV);
1509                 return vport;
1510         } else
1511                 return ERR_PTR(-EINVAL);
1512 }
1513
1514 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1515 {
1516         struct nlattr **a = info->attrs;
1517         struct ovs_header *ovs_header = info->userhdr;
1518         struct vport_parms parms;
1519         struct sk_buff *reply;
1520         struct vport *vport;
1521         struct datapath *dp;
1522         u32 port_no;
1523         int err;
1524
1525         err = -EINVAL;
1526         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1527             !a[OVS_VPORT_ATTR_UPCALL_PID])
1528                 goto exit;
1529
1530         ovs_lock();
1531         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1532         err = -ENODEV;
1533         if (!dp)
1534                 goto exit_unlock;
1535
1536         if (a[OVS_VPORT_ATTR_PORT_NO]) {
1537                 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1538
1539                 err = -EFBIG;
1540                 if (port_no >= DP_MAX_PORTS)
1541                         goto exit_unlock;
1542
1543                 vport = ovs_vport_ovsl(dp, port_no);
1544                 err = -EBUSY;
1545                 if (vport)
1546                         goto exit_unlock;
1547         } else {
1548                 for (port_no = 1; ; port_no++) {
1549                         if (port_no >= DP_MAX_PORTS) {
1550                                 err = -EFBIG;
1551                                 goto exit_unlock;
1552                         }
1553                         vport = ovs_vport_ovsl(dp, port_no);
1554                         if (!vport)
1555                                 break;
1556                 }
1557         }
1558
1559         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1560         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1561         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1562         parms.dp = dp;
1563         parms.port_no = port_no;
1564         parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1565
1566         vport = new_vport(&parms);
1567         err = PTR_ERR(vport);
1568         if (IS_ERR(vport))
1569                 goto exit_unlock;
1570
1571         err = 0;
1572         if (a[OVS_VPORT_ATTR_STATS])
1573                 ovs_vport_set_stats(vport, nla_data(a[OVS_VPORT_ATTR_STATS]));
1574
1575         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1576                                          OVS_VPORT_CMD_NEW);
1577         if (IS_ERR(reply)) {
1578                 err = PTR_ERR(reply);
1579                 ovs_dp_detach_port(vport);
1580                 goto exit_unlock;
1581         }
1582
1583         ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
1584
1585 exit_unlock:
1586         ovs_unlock();
1587 exit:
1588         return err;
1589 }
1590
1591 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1592 {
1593         struct nlattr **a = info->attrs;
1594         struct sk_buff *reply;
1595         struct vport *vport;
1596         int err;
1597
1598         ovs_lock();
1599         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1600         err = PTR_ERR(vport);
1601         if (IS_ERR(vport))
1602                 goto exit_unlock;
1603
1604         if (a[OVS_VPORT_ATTR_TYPE] &&
1605             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1606                 err = -EINVAL;
1607                 goto exit_unlock;
1608         }
1609
1610         reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1611         if (!reply) {
1612                 err = -ENOMEM;
1613                 goto exit_unlock;
1614         }
1615
1616         if (a[OVS_VPORT_ATTR_OPTIONS]) {
1617                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1618                 if (err)
1619                         goto exit_free;
1620         }
1621
1622         if (a[OVS_VPORT_ATTR_STATS])
1623                 ovs_vport_set_stats(vport, nla_data(a[OVS_VPORT_ATTR_STATS]));
1624
1625         if (a[OVS_VPORT_ATTR_UPCALL_PID])
1626                 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1627
1628         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1629                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1630         BUG_ON(err < 0);
1631
1632         ovs_unlock();
1633         ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
1634         return 0;
1635
1636 exit_free:
1637         kfree_skb(reply);
1638 exit_unlock:
1639         ovs_unlock();
1640         return err;
1641 }
1642
1643 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1644 {
1645         struct nlattr **a = info->attrs;
1646         struct sk_buff *reply;
1647         struct vport *vport;
1648         int err;
1649
1650         ovs_lock();
1651         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1652         err = PTR_ERR(vport);
1653         if (IS_ERR(vport))
1654                 goto exit_unlock;
1655
1656         if (vport->port_no == OVSP_LOCAL) {
1657                 err = -EINVAL;
1658                 goto exit_unlock;
1659         }
1660
1661         reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
1662                                          info->snd_seq, OVS_VPORT_CMD_DEL);
1663         err = PTR_ERR(reply);
1664         if (IS_ERR(reply))
1665                 goto exit_unlock;
1666
1667         err = 0;
1668         ovs_dp_detach_port(vport);
1669
1670         ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
1671
1672 exit_unlock:
1673         ovs_unlock();
1674         return err;
1675 }
1676
1677 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1678 {
1679         struct nlattr **a = info->attrs;
1680         struct ovs_header *ovs_header = info->userhdr;
1681         struct sk_buff *reply;
1682         struct vport *vport;
1683         int err;
1684
1685         rcu_read_lock();
1686         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1687         err = PTR_ERR(vport);
1688         if (IS_ERR(vport))
1689                 goto exit_unlock;
1690
1691         reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
1692                                          info->snd_seq, OVS_VPORT_CMD_NEW);
1693         err = PTR_ERR(reply);
1694         if (IS_ERR(reply))
1695                 goto exit_unlock;
1696
1697         rcu_read_unlock();
1698
1699         return genlmsg_reply(reply, info);
1700
1701 exit_unlock:
1702         rcu_read_unlock();
1703         return err;
1704 }
1705
1706 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1707 {
1708         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1709         struct datapath *dp;
1710         int bucket = cb->args[0], skip = cb->args[1];
1711         int i, j = 0;
1712
1713         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1714         if (!dp)
1715                 return -ENODEV;
1716
1717         rcu_read_lock();
1718         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1719                 struct vport *vport;
1720
1721                 j = 0;
1722                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1723                         if (j >= skip &&
1724                             ovs_vport_cmd_fill_info(vport, skb,
1725                                                     NETLINK_CB(cb->skb).portid,
1726                                                     cb->nlh->nlmsg_seq,
1727                                                     NLM_F_MULTI,
1728                                                     OVS_VPORT_CMD_NEW) < 0)
1729                                 goto out;
1730
1731                         j++;
1732                 }
1733                 skip = 0;
1734         }
1735 out:
1736         rcu_read_unlock();
1737
1738         cb->args[0] = i;
1739         cb->args[1] = j;
1740
1741         return skb->len;
1742 }
1743
1744 static struct genl_ops dp_vport_genl_ops[] = {
1745         { .cmd = OVS_VPORT_CMD_NEW,
1746           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1747           .policy = vport_policy,
1748           .doit = ovs_vport_cmd_new
1749         },
1750         { .cmd = OVS_VPORT_CMD_DEL,
1751           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1752           .policy = vport_policy,
1753           .doit = ovs_vport_cmd_del
1754         },
1755         { .cmd = OVS_VPORT_CMD_GET,
1756           .flags = 0,               /* OK for unprivileged users. */
1757           .policy = vport_policy,
1758           .doit = ovs_vport_cmd_get,
1759           .dumpit = ovs_vport_cmd_dump
1760         },
1761         { .cmd = OVS_VPORT_CMD_SET,
1762           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1763           .policy = vport_policy,
1764           .doit = ovs_vport_cmd_set,
1765         },
1766 };
1767
1768 struct genl_family_and_ops {
1769         struct genl_family *family;
1770         struct genl_ops *ops;
1771         int n_ops;
1772         struct genl_multicast_group *group;
1773 };
1774
1775 static const struct genl_family_and_ops dp_genl_families[] = {
1776         { &dp_datapath_genl_family,
1777           dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1778           &ovs_dp_datapath_multicast_group },
1779         { &dp_vport_genl_family,
1780           dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1781           &ovs_dp_vport_multicast_group },
1782         { &dp_flow_genl_family,
1783           dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1784           &ovs_dp_flow_multicast_group },
1785         { &dp_packet_genl_family,
1786           dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1787           NULL },
1788 };
1789
1790 static void dp_unregister_genl(int n_families)
1791 {
1792         int i;
1793
1794         for (i = 0; i < n_families; i++)
1795                 genl_unregister_family(dp_genl_families[i].family);
1796 }
1797
1798 static int dp_register_genl(void)
1799 {
1800         int n_registered;
1801         int err;
1802         int i;
1803
1804         n_registered = 0;
1805         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1806                 const struct genl_family_and_ops *f = &dp_genl_families[i];
1807
1808                 err = genl_register_family_with_ops(f->family, f->ops,
1809                                                     f->n_ops);
1810                 if (err)
1811                         goto error;
1812                 n_registered++;
1813
1814                 if (f->group) {
1815                         err = genl_register_mc_group(f->family, f->group);
1816                         if (err)
1817                                 goto error;
1818                 }
1819         }
1820
1821         return 0;
1822
1823 error:
1824         dp_unregister_genl(n_registered);
1825         return err;
1826 }
1827
1828 static int __net_init ovs_init_net(struct net *net)
1829 {
1830         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1831
1832         INIT_LIST_HEAD(&ovs_net->dps);
1833         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
1834         return 0;
1835 }
1836
1837 static void __net_exit ovs_exit_net(struct net *net)
1838 {
1839         struct datapath *dp, *dp_next;
1840         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1841
1842         ovs_lock();
1843         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
1844                 __dp_destroy(dp);
1845         ovs_unlock();
1846
1847         cancel_work_sync(&ovs_net->dp_notify_work);
1848 }
1849
1850 static struct pernet_operations ovs_net_ops = {
1851         .init = ovs_init_net,
1852         .exit = ovs_exit_net,
1853         .id   = &ovs_net_id,
1854         .size = sizeof(struct ovs_net),
1855 };
1856
1857 DEFINE_COMPAT_PNET_REG_FUNC(device);
1858
1859 static int __init dp_init(void)
1860 {
1861         int err;
1862
1863         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
1864
1865         pr_info("Open vSwitch switching datapath %s, built "__DATE__" "__TIME__"\n",
1866                 VERSION);
1867
1868         err = ovs_flow_init();
1869         if (err)
1870                 goto error;
1871
1872         err = ovs_vport_init();
1873         if (err)
1874                 goto error_flow_exit;
1875
1876         err = register_pernet_device(&ovs_net_ops);
1877         if (err)
1878                 goto error_vport_exit;
1879
1880         err = register_netdevice_notifier(&ovs_dp_device_notifier);
1881         if (err)
1882                 goto error_netns_exit;
1883
1884         err = dp_register_genl();
1885         if (err < 0)
1886                 goto error_unreg_notifier;
1887
1888         return 0;
1889
1890 error_unreg_notifier:
1891         unregister_netdevice_notifier(&ovs_dp_device_notifier);
1892 error_netns_exit:
1893         unregister_pernet_device(&ovs_net_ops);
1894 error_vport_exit:
1895         ovs_vport_exit();
1896 error_flow_exit:
1897         ovs_flow_exit();
1898 error:
1899         return err;
1900 }
1901
1902 static void dp_cleanup(void)
1903 {
1904         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
1905         unregister_netdevice_notifier(&ovs_dp_device_notifier);
1906         unregister_pernet_device(&ovs_net_ops);
1907         rcu_barrier();
1908         ovs_vport_exit();
1909         ovs_flow_exit();
1910 }
1911
1912 module_init(dp_init);
1913 module_exit(dp_cleanup);
1914
1915 MODULE_DESCRIPTION("Open vSwitch switching datapath");
1916 MODULE_LICENSE("GPL");
1917 MODULE_VERSION(VERSION);