net/openvswitch/datapath.c

   1 /*
   2  * Copyright (c) 2007-2012 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/openvswitch.h>
  48 #include <linux/rculist.h>
  49 #include <linux/dmi.h>
  50 #include <linux/workqueue.h>
  51 #include <net/genetlink.h>
  52 #include <net/net_namespace.h>
  53 #include <net/netns/generic.h>
  54
  55 #include "datapath.h"
  56 #include "flow.h"
  57 #include "vport-internal_dev.h"
  58
  59 /**
  60  * struct ovs_net - Per net-namespace data for ovs.
  61  * @dps: List of datapaths to enable dumping them all out.
  62  * Protected by genl_mutex.
  63  */
  64 struct ovs_net {
  65         struct list_head dps;
  66 };
  67
  68 static int ovs_net_id __read_mostly;
  69
  70 #define REHASH_FLOW_INTERVAL (10 * 60 * HZ)
  71 static void rehash_flow_table(struct work_struct *work);
  72 static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table);
  73
  74 /**
  75  * DOC: Locking:
  76  *
  77  * Writes to device state (add/remove datapath, port, set operations on vports,
  78  * etc.) are protected by RTNL.
  79  *
  80  * Writes to other state (flow table modifications, set miscellaneous datapath
  81  * parameters, etc.) are protected by genl_mutex.  The RTNL lock nests inside
  82  * genl_mutex.
  83  *
  84  * Reads are protected by RCU.
  85  *
  86  * There are a few special cases (mostly stats) that have their own
  87  * synchronization but they nest under all of above and don't interact with
  88  * each other.
  89  */
  90
  91 static struct vport *new_vport(const struct vport_parms *);
  92 static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *,
  93                              const struct dp_upcall_info *);
  94 static int queue_userspace_packet(struct net *, int dp_ifindex,
  95                                   struct sk_buff *,
  96                                   const struct dp_upcall_info *);
  97
  98 /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */
  99 static struct datapath *get_dp(struct net *net, int dp_ifindex)
 100 {
 101         struct datapath *dp = NULL;
 102         struct net_device *dev;
 103
 104         rcu_read_lock();
 105         dev = dev_get_by_index_rcu(net, dp_ifindex);
 106         if (dev) {
 107                 struct vport *vport = ovs_internal_dev_get_vport(dev);
 108                 if (vport)
 109                         dp = vport->dp;
 110         }
 111         rcu_read_unlock();
 112
 113         return dp;
 114 }
 115
 116 /* Must be called with rcu_read_lock or RTNL lock. */
 117 const char *ovs_dp_name(const struct datapath *dp)
 118 {
 119         struct vport *vport = ovs_vport_rtnl_rcu(dp, OVSP_LOCAL);
 120         return vport->ops->get_name(vport);
 121 }
 122
 123 static int get_dpifindex(struct datapath *dp)
 124 {
 125         struct vport *local;
 126         int ifindex;
 127
 128         rcu_read_lock();
 129
 130         local = ovs_vport_rcu(dp, OVSP_LOCAL);
 131         if (local)
 132                 ifindex = local->ops->get_ifindex(local);
 133         else
 134                 ifindex = 0;
 135
 136         rcu_read_unlock();
 137
 138         return ifindex;
 139 }
 140
 141 static void destroy_dp_rcu(struct rcu_head *rcu)
 142 {
 143         struct datapath *dp = container_of(rcu, struct datapath, rcu);
 144
 145         ovs_flow_tbl_destroy((__force struct flow_table *)dp->table);
 146         free_percpu(dp->stats_percpu);
 147         release_net(ovs_dp_get_net(dp));
 148         kfree(dp->ports);
 149         kfree(dp);
 150 }
 151
 152 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
 153                                             u16 port_no)
 154 {
 155         return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
 156 }
 157
 158 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
 159 {
 160         struct vport *vport;
 161         struct hlist_node *n;
 162         struct hlist_head *head;
 163
 164         head = vport_hash_bucket(dp, port_no);
 165         hlist_for_each_entry_rcu(vport, n, head, dp_hash_node) {
 166                 if (vport->port_no == port_no)
 167                         return vport;
 168         }
 169         return NULL;
 170 }
 171
 172 /* Called with RTNL lock and genl_lock. */
 173 static struct vport *new_vport(const struct vport_parms *parms)
 174 {
 175         struct vport *vport;
 176
 177         vport = ovs_vport_add(parms);
 178         if (!IS_ERR(vport)) {
 179                 struct datapath *dp = parms->dp;
 180                 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
 181
 182                 hlist_add_head_rcu(&vport->dp_hash_node, head);
 183         }
 184
 185         return vport;
 186 }
 187
 188 /* Called with RTNL lock. */
 189 void ovs_dp_detach_port(struct vport *p)
 190 {
 191         ASSERT_RTNL();
 192
 193         /* First drop references to device. */
 194         hlist_del_rcu(&p->dp_hash_node);
 195
 196         /* Then destroy it. */
 197         ovs_vport_del(p);
 198 }
 199
 200 /* Must be called with rcu_read_lock. */
 201 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
 202 {
 203         struct datapath *dp = p->dp;
 204         struct sw_flow *flow;
 205         struct dp_stats_percpu *stats;
 206         struct sw_flow_key key;
 207         u64 *stats_counter;
 208         int error;
 209         int key_len;
 210
 211         stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
 212
 213         /* Extract flow from 'skb' into 'key'. */
 214         error = ovs_flow_extract(skb, p->port_no, &key, &key_len);
 215         if (unlikely(error)) {
 216                 kfree_skb(skb);
 217                 return;
 218         }
 219
 220         /* Look up flow. */
 221         flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len);
 222         if (unlikely(!flow)) {
 223                 struct dp_upcall_info upcall;
 224
 225                 upcall.cmd = OVS_PACKET_CMD_MISS;
 226                 upcall.key = &key;
 227                 upcall.userdata = NULL;
 228                 upcall.portid = p->upcall_portid;
 229                 ovs_dp_upcall(dp, skb, &upcall);
 230                 consume_skb(skb);
 231                 stats_counter = &stats->n_missed;
 232                 goto out;
 233         }
 234
 235         OVS_CB(skb)->flow = flow;
 236
 237         stats_counter = &stats->n_hit;
 238         ovs_flow_used(OVS_CB(skb)->flow, skb);
 239         ovs_execute_actions(dp, skb);
 240
 241 out:
 242         /* Update datapath statistics. */
 243         u64_stats_update_begin(&stats->sync);
 244         (*stats_counter)++;
 245         u64_stats_update_end(&stats->sync);
 246 }
 247
 248 static struct genl_family dp_packet_genl_family = {
 249         .id = GENL_ID_GENERATE,
 250         .hdrsize = sizeof(struct ovs_header),
 251         .name = OVS_PACKET_FAMILY,
 252         .version = OVS_PACKET_VERSION,
 253         .maxattr = OVS_PACKET_ATTR_MAX,
 254         .netnsok = true
 255 };
 256
 257 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
 258                   const struct dp_upcall_info *upcall_info)
 259 {
 260         struct dp_stats_percpu *stats;
 261         int dp_ifindex;
 262         int err;
 263
 264         if (upcall_info->portid == 0) {
 265                 err = -ENOTCONN;
 266                 goto err;
 267         }
 268
 269         dp_ifindex = get_dpifindex(dp);
 270         if (!dp_ifindex) {
 271                 err = -ENODEV;
 272                 goto err;
 273         }
 274
 275         if (!skb_is_gso(skb))
 276                 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
 277         else
 278                 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
 279         if (err)
 280                 goto err;
 281
 282         return 0;
 283
 284 err:
 285         stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
 286
 287         u64_stats_update_begin(&stats->sync);
 288         stats->n_lost++;
 289         u64_stats_update_end(&stats->sync);
 290
 291         return err;
 292 }
 293
 294 static int queue_gso_packets(struct net *net, int dp_ifindex,
 295                              struct sk_buff *skb,
 296                              const struct dp_upcall_info *upcall_info)
 297 {
 298         unsigned short gso_type = skb_shinfo(skb)->gso_type;
 299         struct dp_upcall_info later_info;
 300         struct sw_flow_key later_key;
 301         struct sk_buff *segs, *nskb;
 302         int err;
 303
 304         segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
 305         if (IS_ERR(segs))
 306                 return PTR_ERR(segs);
 307
 308         /* Queue all of the segments. */
 309         skb = segs;
 310         do {
 311                 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
 312                 if (err)
 313                         break;
 314
 315                 if (skb == segs && gso_type & SKB_GSO_UDP) {
 316                         /* The initial flow key extracted by ovs_flow_extract()
 317                          * in this case is for a first fragment, so we need to
 318                          * properly mark later fragments.
 319                          */
 320                         later_key = *upcall_info->key;
 321                         later_key.ip.frag = OVS_FRAG_TYPE_LATER;
 322
 323                         later_info = *upcall_info;
 324                         later_info.key = &later_key;
 325                         upcall_info = &later_info;
 326                 }
 327         } while ((skb = skb->next));
 328
 329         /* Free all of the segments. */
 330         skb = segs;
 331         do {
 332                 nskb = skb->next;
 333                 if (err)
 334                         kfree_skb(skb);
 335                 else
 336                         consume_skb(skb);
 337         } while ((skb = nskb));
 338         return err;
 339 }
 340
 341 static int queue_userspace_packet(struct net *net, int dp_ifindex,
 342                                   struct sk_buff *skb,
 343                                   const struct dp_upcall_info *upcall_info)
 344 {
 345         struct ovs_header *upcall;
 346         struct sk_buff *nskb = NULL;
 347         struct sk_buff *user_skb; /* to be queued to userspace */
 348         struct nlattr *nla;
 349         unsigned int len;
 350         int err;
 351
 352         if (vlan_tx_tag_present(skb)) {
 353                 nskb = skb_clone(skb, GFP_ATOMIC);
 354                 if (!nskb)
 355                         return -ENOMEM;
 356
 357                 nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb));
 358                 if (!nskb)
 359                         return -ENOMEM;
 360
 361                 nskb->vlan_tci = 0;
 362                 skb = nskb;
 363         }
 364
 365         if (nla_attr_size(skb->len) > USHRT_MAX) {
 366                 err = -EFBIG;
 367                 goto out;
 368         }
 369
 370         len = sizeof(struct ovs_header);
 371         len += nla_total_size(skb->len);
 372         len += nla_total_size(FLOW_BUFSIZE);
 373         if (upcall_info->cmd == OVS_PACKET_CMD_ACTION)
 374                 len += nla_total_size(8);
 375
 376         user_skb = genlmsg_new(len, GFP_ATOMIC);
 377         if (!user_skb) {
 378                 err = -ENOMEM;
 379                 goto out;
 380         }
 381
 382         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
 383                              0, upcall_info->cmd);
 384         upcall->dp_ifindex = dp_ifindex;
 385
 386         nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
 387         ovs_flow_to_nlattrs(upcall_info->key, user_skb);
 388         nla_nest_end(user_skb, nla);
 389
 390         if (upcall_info->userdata)
 391                 nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA,
 392                             nla_get_u64(upcall_info->userdata));
 393
 394         nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
 395
 396         skb_copy_and_csum_dev(skb, nla_data(nla));
 397
 398         err = genlmsg_unicast(net, user_skb, upcall_info->portid);
 399
 400 out:
 401         kfree_skb(nskb);
 402         return err;
 403 }
 404
 405 /* Called with genl_mutex. */
 406 static int flush_flows(struct datapath *dp)
 407 {
 408         struct flow_table *old_table;
 409         struct flow_table *new_table;
 410
 411         old_table = genl_dereference(dp->table);
 412         new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
 413         if (!new_table)
 414                 return -ENOMEM;
 415
 416         rcu_assign_pointer(dp->table, new_table);
 417
 418         ovs_flow_tbl_deferred_destroy(old_table);
 419         return 0;
 420 }
 421
 422 static int validate_actions(const struct nlattr *attr,
 423                                 const struct sw_flow_key *key, int depth);
 424
 425 static int validate_sample(const struct nlattr *attr,
 426                                 const struct sw_flow_key *key, int depth)
 427 {
 428         const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
 429         const struct nlattr *probability, *actions;
 430         const struct nlattr *a;
 431         int rem;
 432
 433         memset(attrs, 0, sizeof(attrs));
 434         nla_for_each_nested(a, attr, rem) {
 435                 int type = nla_type(a);
 436                 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
 437                         return -EINVAL;
 438                 attrs[type] = a;
 439         }
 440         if (rem)
 441                 return -EINVAL;
 442
 443         probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
 444         if (!probability || nla_len(probability) != sizeof(u32))
 445                 return -EINVAL;
 446
 447         actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
 448         if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
 449                 return -EINVAL;
 450         return validate_actions(actions, key, depth + 1);
 451 }
 452
 453 static int validate_tp_port(const struct sw_flow_key *flow_key)
 454 {
 455         if (flow_key->eth.type == htons(ETH_P_IP)) {
 456                 if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst)
 457                         return 0;
 458         } else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
 459                 if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst)
 460                         return 0;
 461         }
 462
 463         return -EINVAL;
 464 }
 465
 466 static int validate_set(const struct nlattr *a,
 467                         const struct sw_flow_key *flow_key)
 468 {
 469         const struct nlattr *ovs_key = nla_data(a);
 470         int key_type = nla_type(ovs_key);
 471
 472         /* There can be only one key in a action */
 473         if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
 474                 return -EINVAL;
 475
 476         if (key_type > OVS_KEY_ATTR_MAX ||
 477             nla_len(ovs_key) != ovs_key_lens[key_type])
 478                 return -EINVAL;
 479
 480         switch (key_type) {
 481         const struct ovs_key_ipv4 *ipv4_key;
 482
 483         case OVS_KEY_ATTR_PRIORITY:
 484         case OVS_KEY_ATTR_ETHERNET:
 485                 break;
 486
 487         case OVS_KEY_ATTR_IPV4:
 488                 if (flow_key->eth.type != htons(ETH_P_IP))
 489                         return -EINVAL;
 490
 491                 if (!flow_key->ip.proto)
 492                         return -EINVAL;
 493
 494                 ipv4_key = nla_data(ovs_key);
 495                 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
 496                         return -EINVAL;
 497
 498                 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
 499                         return -EINVAL;
 500
 501                 break;
 502
 503         case OVS_KEY_ATTR_TCP:
 504                 if (flow_key->ip.proto != IPPROTO_TCP)
 505                         return -EINVAL;
 506
 507                 return validate_tp_port(flow_key);
 508
 509         case OVS_KEY_ATTR_UDP:
 510                 if (flow_key->ip.proto != IPPROTO_UDP)
 511                         return -EINVAL;
 512
 513                 return validate_tp_port(flow_key);
 514
 515         default:
 516                 return -EINVAL;
 517         }
 518
 519         return 0;
 520 }
 521
 522 static int validate_userspace(const struct nlattr *attr)
 523 {
 524         static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] =   {
 525                 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
 526                 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 },
 527         };
 528         struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
 529         int error;
 530
 531         error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
 532                                  attr, userspace_policy);
 533         if (error)
 534                 return error;
 535
 536         if (!a[OVS_USERSPACE_ATTR_PID] ||
 537             !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
 538                 return -EINVAL;
 539
 540         return 0;
 541 }
 542
 543 static int validate_actions(const struct nlattr *attr,
 544                                 const struct sw_flow_key *key,  int depth)
 545 {
 546         const struct nlattr *a;
 547         int rem, err;
 548
 549         if (depth >= SAMPLE_ACTION_DEPTH)
 550                 return -EOVERFLOW;
 551
 552         nla_for_each_nested(a, attr, rem) {
 553                 /* Expected argument lengths, (u32)-1 for variable length. */
 554                 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
 555                         [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
 556                         [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
 557                         [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
 558                         [OVS_ACTION_ATTR_POP_VLAN] = 0,
 559                         [OVS_ACTION_ATTR_SET] = (u32)-1,
 560                         [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
 561                 };
 562                 const struct ovs_action_push_vlan *vlan;
 563                 int type = nla_type(a);
 564
 565                 if (type > OVS_ACTION_ATTR_MAX ||
 566                     (action_lens[type] != nla_len(a) &&
 567                      action_lens[type] != (u32)-1))
 568                         return -EINVAL;
 569
 570                 switch (type) {
 571                 case OVS_ACTION_ATTR_UNSPEC:
 572                         return -EINVAL;
 573
 574                 case OVS_ACTION_ATTR_USERSPACE:
 575                         err = validate_userspace(a);
 576                         if (err)
 577                                 return err;
 578                         break;
 579
 580                 case OVS_ACTION_ATTR_OUTPUT:
 581                         if (nla_get_u32(a) >= DP_MAX_PORTS)
 582                                 return -EINVAL;
 583                         break;
 584
 585
 586                 case OVS_ACTION_ATTR_POP_VLAN:
 587                         break;
 588
 589                 case OVS_ACTION_ATTR_PUSH_VLAN:
 590                         vlan = nla_data(a);
 591                         if (vlan->vlan_tpid != htons(ETH_P_8021Q))
 592                                 return -EINVAL;
 593                         if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
 594                                 return -EINVAL;
 595                         break;
 596
 597                 case OVS_ACTION_ATTR_SET:
 598                         err = validate_set(a, key);
 599                         if (err)
 600                                 return err;
 601                         break;
 602
 603                 case OVS_ACTION_ATTR_SAMPLE:
 604                         err = validate_sample(a, key, depth);
 605                         if (err)
 606                                 return err;
 607                         break;
 608
 609                 default:
 610                         return -EINVAL;
 611                 }
 612         }
 613
 614         if (rem > 0)
 615                 return -EINVAL;
 616
 617         return 0;
 618 }
 619
 620 static void clear_stats(struct sw_flow *flow)
 621 {
 622         flow->used = 0;
 623         flow->tcp_flags = 0;
 624         flow->packet_count = 0;
 625         flow->byte_count = 0;
 626 }
 627
 628 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 629 {
 630         struct ovs_header *ovs_header = info->userhdr;
 631         struct nlattr **a = info->attrs;
 632         struct sw_flow_actions *acts;
 633         struct sk_buff *packet;
 634         struct sw_flow *flow;
 635         struct datapath *dp;
 636         struct ethhdr *eth;
 637         int len;
 638         int err;
 639         int key_len;
 640
 641         err = -EINVAL;
 642         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 643             !a[OVS_PACKET_ATTR_ACTIONS] ||
 644             nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN)
 645                 goto err;
 646
 647         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 648         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 649         err = -ENOMEM;
 650         if (!packet)
 651                 goto err;
 652         skb_reserve(packet, NET_IP_ALIGN);
 653
 654         memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len);
 655
 656         skb_reset_mac_header(packet);
 657         eth = eth_hdr(packet);
 658
 659         /* Normally, setting the skb 'protocol' field would be handled by a
 660          * call to eth_type_trans(), but it assumes there's a sending
 661          * device, which we may not have. */
 662         if (ntohs(eth->h_proto) >= 1536)
 663                 packet->protocol = eth->h_proto;
 664         else
 665                 packet->protocol = htons(ETH_P_802_2);
 666
 667         /* Build an sw_flow for sending this packet. */
 668         flow = ovs_flow_alloc();
 669         err = PTR_ERR(flow);
 670         if (IS_ERR(flow))
 671                 goto err_kfree_skb;
 672
 673         err = ovs_flow_extract(packet, -1, &flow->key, &key_len);
 674         if (err)
 675                 goto err_flow_free;
 676
 677         err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority,
 678                                              &flow->key.phy.in_port,
 679                                              a[OVS_PACKET_ATTR_KEY]);
 680         if (err)
 681                 goto err_flow_free;
 682
 683         err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0);
 684         if (err)
 685                 goto err_flow_free;
 686
 687         flow->hash = ovs_flow_hash(&flow->key, key_len);
 688
 689         acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]);
 690         err = PTR_ERR(acts);
 691         if (IS_ERR(acts))
 692                 goto err_flow_free;
 693         rcu_assign_pointer(flow->sf_acts, acts);
 694
 695         OVS_CB(packet)->flow = flow;
 696         packet->priority = flow->key.phy.priority;
 697
 698         rcu_read_lock();
 699         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 700         err = -ENODEV;
 701         if (!dp)
 702                 goto err_unlock;
 703
 704         local_bh_disable();
 705         err = ovs_execute_actions(dp, packet);
 706         local_bh_enable();
 707         rcu_read_unlock();
 708
 709         ovs_flow_free(flow);
 710         return err;
 711
 712 err_unlock:
 713         rcu_read_unlock();
 714 err_flow_free:
 715         ovs_flow_free(flow);
 716 err_kfree_skb:
 717         kfree_skb(packet);
 718 err:
 719         return err;
 720 }
 721
 722 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 723         [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
 724         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 725         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 726 };
 727
 728 static struct genl_ops dp_packet_genl_ops[] = {
 729         { .cmd = OVS_PACKET_CMD_EXECUTE,
 730           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 731           .policy = packet_policy,
 732           .doit = ovs_packet_cmd_execute
 733         }
 734 };
 735
 736 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
 737 {
 738         int i;
 739         struct flow_table *table = genl_dereference(dp->table);
 740
 741         stats->n_flows = ovs_flow_tbl_count(table);
 742
 743         stats->n_hit = stats->n_missed = stats->n_lost = 0;
 744         for_each_possible_cpu(i) {
 745                 const struct dp_stats_percpu *percpu_stats;
 746                 struct dp_stats_percpu local_stats;
 747                 unsigned int start;
 748
 749                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 750
 751                 do {
 752                         start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
 753                         local_stats = *percpu_stats;
 754                 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
 755
 756                 stats->n_hit += local_stats.n_hit;
 757                 stats->n_missed += local_stats.n_missed;
 758                 stats->n_lost += local_stats.n_lost;
 759         }
 760 }
 761
 762 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
 763         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
 764         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
 765         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
 766 };
 767
 768 static struct genl_family dp_flow_genl_family = {
 769         .id = GENL_ID_GENERATE,
 770         .hdrsize = sizeof(struct ovs_header),
 771         .name = OVS_FLOW_FAMILY,
 772         .version = OVS_FLOW_VERSION,
 773         .maxattr = OVS_FLOW_ATTR_MAX,
 774         .netnsok = true
 775 };
 776
 777 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
 778         .name = OVS_FLOW_MCGROUP
 779 };
 780
 781 /* Called with genl_lock. */
 782 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
 783                                   struct sk_buff *skb, u32 portid,
 784                                   u32 seq, u32 flags, u8 cmd)
 785 {
 786         const int skb_orig_len = skb->len;
 787         const struct sw_flow_actions *sf_acts;
 788         struct ovs_flow_stats stats;
 789         struct ovs_header *ovs_header;
 790         struct nlattr *nla;
 791         unsigned long used;
 792         u8 tcp_flags;
 793         int err;
 794
 795         sf_acts = rcu_dereference_protected(flow->sf_acts,
 796                                             lockdep_genl_is_held());
 797
 798         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
 799         if (!ovs_header)
 800                 return -EMSGSIZE;
 801
 802         ovs_header->dp_ifindex = get_dpifindex(dp);
 803
 804         nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
 805         if (!nla)
 806                 goto nla_put_failure;
 807         err = ovs_flow_to_nlattrs(&flow->key, skb);
 808         if (err)
 809                 goto error;
 810         nla_nest_end(skb, nla);
 811
 812         spin_lock_bh(&flow->lock);
 813         used = flow->used;
 814         stats.n_packets = flow->packet_count;
 815         stats.n_bytes = flow->byte_count;
 816         tcp_flags = flow->tcp_flags;
 817         spin_unlock_bh(&flow->lock);
 818
 819         if (used &&
 820             nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
 821                 goto nla_put_failure;
 822
 823         if (stats.n_packets &&
 824             nla_put(skb, OVS_FLOW_ATTR_STATS,
 825                     sizeof(struct ovs_flow_stats), &stats))
 826                 goto nla_put_failure;
 827
 828         if (tcp_flags &&
 829             nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
 830                 goto nla_put_failure;
 831
 832         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 833          * this is the first flow to be dumped into 'skb'.  This is unusual for
 834          * Netlink but individual action lists can be longer than
 835          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 836          * The userspace caller can always fetch the actions separately if it
 837          * really wants them.  (Most userspace callers in fact don't care.)
 838          *
 839          * This can only fail for dump operations because the skb is always
 840          * properly sized for single flows.
 841          */
 842         err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
 843                       sf_acts->actions);
 844         if (err < 0 && skb_orig_len)
 845                 goto error;
 846
 847         return genlmsg_end(skb, ovs_header);
 848
 849 nla_put_failure:
 850         err = -EMSGSIZE;
 851 error:
 852         genlmsg_cancel(skb, ovs_header);
 853         return err;
 854 }
 855
 856 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
 857 {
 858         const struct sw_flow_actions *sf_acts;
 859         int len;
 860
 861         sf_acts = rcu_dereference_protected(flow->sf_acts,
 862                                             lockdep_genl_is_held());
 863
 864         /* OVS_FLOW_ATTR_KEY */
 865         len = nla_total_size(FLOW_BUFSIZE);
 866         /* OVS_FLOW_ATTR_ACTIONS */
 867         len += nla_total_size(sf_acts->actions_len);
 868         /* OVS_FLOW_ATTR_STATS */
 869         len += nla_total_size(sizeof(struct ovs_flow_stats));
 870         /* OVS_FLOW_ATTR_TCP_FLAGS */
 871         len += nla_total_size(1);
 872         /* OVS_FLOW_ATTR_USED */
 873         len += nla_total_size(8);
 874
 875         len += NLMSG_ALIGN(sizeof(struct ovs_header));
 876
 877         return genlmsg_new(len, GFP_KERNEL);
 878 }
 879
 880 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
 881                                                struct datapath *dp,
 882                                                u32 portid, u32 seq, u8 cmd)
 883 {
 884         struct sk_buff *skb;
 885         int retval;
 886
 887         skb = ovs_flow_cmd_alloc_info(flow);
 888         if (!skb)
 889                 return ERR_PTR(-ENOMEM);
 890
 891         retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
 892         BUG_ON(retval < 0);
 893         return skb;
 894 }
 895
 896 static int ovs_flow_cmd_new_or_set(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 sw_flow *flow;
 902         struct sk_buff *reply;
 903         struct datapath *dp;
 904         struct flow_table *table;
 905         int error;
 906         int key_len;
 907
 908         /* Extract key. */
 909         error = -EINVAL;
 910         if (!a[OVS_FLOW_ATTR_KEY])
 911                 goto error;
 912         error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
 913         if (error)
 914                 goto error;
 915
 916         /* Validate actions. */
 917         if (a[OVS_FLOW_ATTR_ACTIONS]) {
 918                 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key,  0);
 919                 if (error)
 920                         goto error;
 921         } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
 922                 error = -EINVAL;
 923                 goto error;
 924         }
 925
 926         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 927         error = -ENODEV;
 928         if (!dp)
 929                 goto error;
 930
 931         table = genl_dereference(dp->table);
 932         flow = ovs_flow_tbl_lookup(table, &key, key_len);
 933         if (!flow) {
 934                 struct sw_flow_actions *acts;
 935
 936                 /* Bail out if we're not allowed to create a new flow. */
 937                 error = -ENOENT;
 938                 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
 939                         goto error;
 940
 941                 /* Expand table, if necessary, to make room. */
 942                 if (ovs_flow_tbl_need_to_expand(table)) {
 943                         struct flow_table *new_table;
 944
 945                         new_table = ovs_flow_tbl_expand(table);
 946                         if (!IS_ERR(new_table)) {
 947                                 rcu_assign_pointer(dp->table, new_table);
 948                                 ovs_flow_tbl_deferred_destroy(table);
 949                                 table = genl_dereference(dp->table);
 950                         }
 951                 }
 952
 953                 /* Allocate flow. */
 954                 flow = ovs_flow_alloc();
 955                 if (IS_ERR(flow)) {
 956                         error = PTR_ERR(flow);
 957                         goto error;
 958                 }
 959                 flow->key = key;
 960                 clear_stats(flow);
 961
 962                 /* Obtain actions. */
 963                 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
 964                 error = PTR_ERR(acts);
 965                 if (IS_ERR(acts))
 966                         goto error_free_flow;
 967                 rcu_assign_pointer(flow->sf_acts, acts);
 968
 969                 /* Put flow in bucket. */
 970                 flow->hash = ovs_flow_hash(&key, key_len);
 971                 ovs_flow_tbl_insert(table, flow);
 972
 973                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
 974                                                 info->snd_seq,
 975                                                 OVS_FLOW_CMD_NEW);
 976         } else {
 977                 /* We found a matching flow. */
 978                 struct sw_flow_actions *old_acts;
 979                 struct nlattr *acts_attrs;
 980
 981                 /* Bail out if we're not allowed to modify an existing flow.
 982                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
 983                  * because Generic Netlink treats the latter as a dump
 984                  * request.  We also accept NLM_F_EXCL in case that bug ever
 985                  * gets fixed.
 986                  */
 987                 error = -EEXIST;
 988                 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
 989                     info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
 990                         goto error;
 991
 992                 /* Update actions. */
 993                 old_acts = rcu_dereference_protected(flow->sf_acts,
 994                                                      lockdep_genl_is_held());
 995                 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS];
 996                 if (acts_attrs &&
 997                    (old_acts->actions_len != nla_len(acts_attrs) ||
 998                    memcmp(old_acts->actions, nla_data(acts_attrs),
 999                           old_acts->actions_len))) {
1000                         struct sw_flow_actions *new_acts;
1001
1002                         new_acts = ovs_flow_actions_alloc(acts_attrs);
1003                         error = PTR_ERR(new_acts);
1004                         if (IS_ERR(new_acts))
1005                                 goto error;
1006
1007                         rcu_assign_pointer(flow->sf_acts, new_acts);
1008                         ovs_flow_deferred_free_acts(old_acts);
1009                 }
1010
1011                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1012                                                info->snd_seq, OVS_FLOW_CMD_NEW);
1013
1014                 /* Clear stats. */
1015                 if (a[OVS_FLOW_ATTR_CLEAR]) {
1016                         spin_lock_bh(&flow->lock);
1017                         clear_stats(flow);
1018                         spin_unlock_bh(&flow->lock);
1019                 }
1020         }
1021
1022         if (!IS_ERR(reply))
1023                 genl_notify(reply, genl_info_net(info), info->snd_portid,
1024                            ovs_dp_flow_multicast_group.id, info->nlhdr,
1025                            GFP_KERNEL);
1026         else
1027                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1028                                 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
1029         return 0;
1030
1031 error_free_flow:
1032         ovs_flow_free(flow);
1033 error:
1034         return error;
1035 }
1036
1037 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1038 {
1039         struct nlattr **a = info->attrs;
1040         struct ovs_header *ovs_header = info->userhdr;
1041         struct sw_flow_key key;
1042         struct sk_buff *reply;
1043         struct sw_flow *flow;
1044         struct datapath *dp;
1045         struct flow_table *table;
1046         int err;
1047         int key_len;
1048
1049         if (!a[OVS_FLOW_ATTR_KEY])
1050                 return -EINVAL;
1051         err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1052         if (err)
1053                 return err;
1054
1055         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1056         if (!dp)
1057                 return -ENODEV;
1058
1059         table = genl_dereference(dp->table);
1060         flow = ovs_flow_tbl_lookup(table, &key, key_len);
1061         if (!flow)
1062                 return -ENOENT;
1063
1064         reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1065                                         info->snd_seq, OVS_FLOW_CMD_NEW);
1066         if (IS_ERR(reply))
1067                 return PTR_ERR(reply);
1068
1069         return genlmsg_reply(reply, info);
1070 }
1071
1072 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1073 {
1074         struct nlattr **a = info->attrs;
1075         struct ovs_header *ovs_header = info->userhdr;
1076         struct sw_flow_key key;
1077         struct sk_buff *reply;
1078         struct sw_flow *flow;
1079         struct datapath *dp;
1080         struct flow_table *table;
1081         int err;
1082         int key_len;
1083
1084         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1085         if (!dp)
1086                 return -ENODEV;
1087
1088         if (!a[OVS_FLOW_ATTR_KEY])
1089                 return flush_flows(dp);
1090
1091         err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1092         if (err)
1093                 return err;
1094
1095         table = genl_dereference(dp->table);
1096         flow = ovs_flow_tbl_lookup(table, &key, key_len);
1097         if (!flow)
1098                 return -ENOENT;
1099
1100         reply = ovs_flow_cmd_alloc_info(flow);
1101         if (!reply)
1102                 return -ENOMEM;
1103
1104         ovs_flow_tbl_remove(table, flow);
1105
1106         err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
1107                                      info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1108         BUG_ON(err < 0);
1109
1110         ovs_flow_deferred_free(flow);
1111
1112         genl_notify(reply, genl_info_net(info), info->snd_portid,
1113                     ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1114         return 0;
1115 }
1116
1117 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1118 {
1119         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1120         struct datapath *dp;
1121         struct flow_table *table;
1122
1123         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1124         if (!dp)
1125                 return -ENODEV;
1126
1127         table = genl_dereference(dp->table);
1128
1129         for (;;) {
1130                 struct sw_flow *flow;
1131                 u32 bucket, obj;
1132
1133                 bucket = cb->args[0];
1134                 obj = cb->args[1];
1135                 flow = ovs_flow_tbl_next(table, &bucket, &obj);
1136                 if (!flow)
1137                         break;
1138
1139                 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1140                                            NETLINK_CB(cb->skb).portid,
1141                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1142                                            OVS_FLOW_CMD_NEW) < 0)
1143                         break;
1144
1145                 cb->args[0] = bucket;
1146                 cb->args[1] = obj;
1147         }
1148         return skb->len;
1149 }
1150
1151 static struct genl_ops dp_flow_genl_ops[] = {
1152         { .cmd = OVS_FLOW_CMD_NEW,
1153           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1154           .policy = flow_policy,
1155           .doit = ovs_flow_cmd_new_or_set
1156         },
1157         { .cmd = OVS_FLOW_CMD_DEL,
1158           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1159           .policy = flow_policy,
1160           .doit = ovs_flow_cmd_del
1161         },
1162         { .cmd = OVS_FLOW_CMD_GET,
1163           .flags = 0,               /* OK for unprivileged users. */
1164           .policy = flow_policy,
1165           .doit = ovs_flow_cmd_get,
1166           .dumpit = ovs_flow_cmd_dump
1167         },
1168         { .cmd = OVS_FLOW_CMD_SET,
1169           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1170           .policy = flow_policy,
1171           .doit = ovs_flow_cmd_new_or_set,
1172         },
1173 };
1174
1175 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1176         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1177         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1178 };
1179
1180 static struct genl_family dp_datapath_genl_family = {
1181         .id = GENL_ID_GENERATE,
1182         .hdrsize = sizeof(struct ovs_header),
1183         .name = OVS_DATAPATH_FAMILY,
1184         .version = OVS_DATAPATH_VERSION,
1185         .maxattr = OVS_DP_ATTR_MAX,
1186         .netnsok = true
1187 };
1188
1189 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1190         .name = OVS_DATAPATH_MCGROUP
1191 };
1192
1193 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1194                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1195 {
1196         struct ovs_header *ovs_header;
1197         struct ovs_dp_stats dp_stats;
1198         int err;
1199
1200         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1201                                    flags, cmd);
1202         if (!ovs_header)
1203                 goto error;
1204
1205         ovs_header->dp_ifindex = get_dpifindex(dp);
1206
1207         rcu_read_lock();
1208         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1209         rcu_read_unlock();
1210         if (err)
1211                 goto nla_put_failure;
1212
1213         get_dp_stats(dp, &dp_stats);
1214         if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
1215                 goto nla_put_failure;
1216
1217         return genlmsg_end(skb, ovs_header);
1218
1219 nla_put_failure:
1220         genlmsg_cancel(skb, ovs_header);
1221 error:
1222         return -EMSGSIZE;
1223 }
1224
1225 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
1226                                              u32 seq, u8 cmd)
1227 {
1228         struct sk_buff *skb;
1229         int retval;
1230
1231         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1232         if (!skb)
1233                 return ERR_PTR(-ENOMEM);
1234
1235         retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
1236         if (retval < 0) {
1237                 kfree_skb(skb);
1238                 return ERR_PTR(retval);
1239         }
1240         return skb;
1241 }
1242
1243 /* Called with genl_mutex and optionally with RTNL lock also. */
1244 static struct datapath *lookup_datapath(struct net *net,
1245                                         struct ovs_header *ovs_header,
1246                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1247 {
1248         struct datapath *dp;
1249
1250         if (!a[OVS_DP_ATTR_NAME])
1251                 dp = get_dp(net, ovs_header->dp_ifindex);
1252         else {
1253                 struct vport *vport;
1254
1255                 rcu_read_lock();
1256                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1257                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1258                 rcu_read_unlock();
1259         }
1260         return dp ? dp : ERR_PTR(-ENODEV);
1261 }
1262
1263 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1264 {
1265         struct nlattr **a = info->attrs;
1266         struct vport_parms parms;
1267         struct sk_buff *reply;
1268         struct datapath *dp;
1269         struct vport *vport;
1270         struct ovs_net *ovs_net;
1271         int err, i;
1272
1273         err = -EINVAL;
1274         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1275                 goto err;
1276
1277         rtnl_lock();
1278
1279         err = -ENOMEM;
1280         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1281         if (dp == NULL)
1282                 goto err_unlock_rtnl;
1283
1284         ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1285
1286         /* Allocate table. */
1287         err = -ENOMEM;
1288         rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1289         if (!dp->table)
1290                 goto err_free_dp;
1291
1292         dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1293         if (!dp->stats_percpu) {
1294                 err = -ENOMEM;
1295                 goto err_destroy_table;
1296         }
1297
1298         dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1299                         GFP_KERNEL);
1300         if (!dp->ports) {
1301                 err = -ENOMEM;
1302                 goto err_destroy_percpu;
1303         }
1304
1305         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1306                 INIT_HLIST_HEAD(&dp->ports[i]);
1307
1308         /* Set up our datapath device. */
1309         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1310         parms.type = OVS_VPORT_TYPE_INTERNAL;
1311         parms.options = NULL;
1312         parms.dp = dp;
1313         parms.port_no = OVSP_LOCAL;
1314         parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1315
1316         vport = new_vport(&parms);
1317         if (IS_ERR(vport)) {
1318                 err = PTR_ERR(vport);
1319                 if (err == -EBUSY)
1320                         err = -EEXIST;
1321
1322                 goto err_destroy_ports_array;
1323         }
1324
1325         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1326                                       info->snd_seq, OVS_DP_CMD_NEW);
1327         err = PTR_ERR(reply);
1328         if (IS_ERR(reply))
1329                 goto err_destroy_local_port;
1330
1331         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1332         list_add_tail(&dp->list_node, &ovs_net->dps);
1333         rtnl_unlock();
1334
1335         genl_notify(reply, genl_info_net(info), info->snd_portid,
1336                     ovs_dp_datapath_multicast_group.id, info->nlhdr,
1337                     GFP_KERNEL);
1338         return 0;
1339
1340 err_destroy_local_port:
1341         ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
1342 err_destroy_ports_array:
1343         kfree(dp->ports);
1344 err_destroy_percpu:
1345         free_percpu(dp->stats_percpu);
1346 err_destroy_table:
1347         ovs_flow_tbl_destroy(genl_dereference(dp->table));
1348 err_free_dp:
1349         release_net(ovs_dp_get_net(dp));
1350         kfree(dp);
1351 err_unlock_rtnl:
1352         rtnl_unlock();
1353 err:
1354         return err;
1355 }
1356
1357 /* Called with genl_mutex. */
1358 static void __dp_destroy(struct datapath *dp)
1359 {
1360         int i;
1361
1362         rtnl_lock();
1363
1364         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1365                 struct vport *vport;
1366                 struct hlist_node *node, *n;
1367
1368                 hlist_for_each_entry_safe(vport, node, n, &dp->ports[i], dp_hash_node)
1369                         if (vport->port_no != OVSP_LOCAL)
1370                                 ovs_dp_detach_port(vport);
1371         }
1372
1373         list_del(&dp->list_node);
1374         ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
1375
1376         /* rtnl_unlock() will wait until all the references to devices that
1377          * are pending unregistration have been dropped.  We do it here to
1378          * ensure that any internal devices (which contain DP pointers) are
1379          * fully destroyed before freeing the datapath.
1380          */
1381         rtnl_unlock();
1382
1383         call_rcu(&dp->rcu, destroy_dp_rcu);
1384 }
1385
1386 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1387 {
1388         struct sk_buff *reply;
1389         struct datapath *dp;
1390         int err;
1391
1392         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1393         err = PTR_ERR(dp);
1394         if (IS_ERR(dp))
1395                 return err;
1396
1397         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1398                                       info->snd_seq, OVS_DP_CMD_DEL);
1399         err = PTR_ERR(reply);
1400         if (IS_ERR(reply))
1401                 return err;
1402
1403         __dp_destroy(dp);
1404
1405         genl_notify(reply, genl_info_net(info), info->snd_portid,
1406                     ovs_dp_datapath_multicast_group.id, info->nlhdr,
1407                     GFP_KERNEL);
1408
1409         return 0;
1410 }
1411
1412 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1413 {
1414         struct sk_buff *reply;
1415         struct datapath *dp;
1416         int err;
1417
1418         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1419         if (IS_ERR(dp))
1420                 return PTR_ERR(dp);
1421
1422         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1423                                       info->snd_seq, OVS_DP_CMD_NEW);
1424         if (IS_ERR(reply)) {
1425                 err = PTR_ERR(reply);
1426                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1427                                 ovs_dp_datapath_multicast_group.id, err);
1428                 return 0;
1429         }
1430
1431         genl_notify(reply, genl_info_net(info), info->snd_portid,
1432                     ovs_dp_datapath_multicast_group.id, info->nlhdr,
1433                     GFP_KERNEL);
1434
1435         return 0;
1436 }
1437
1438 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1439 {
1440         struct sk_buff *reply;
1441         struct datapath *dp;
1442
1443         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1444         if (IS_ERR(dp))
1445                 return PTR_ERR(dp);
1446
1447         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1448                                       info->snd_seq, OVS_DP_CMD_NEW);
1449         if (IS_ERR(reply))
1450                 return PTR_ERR(reply);
1451
1452         return genlmsg_reply(reply, info);
1453 }
1454
1455 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1456 {
1457         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1458         struct datapath *dp;
1459         int skip = cb->args[0];
1460         int i = 0;
1461
1462         list_for_each_entry(dp, &ovs_net->dps, list_node) {
1463                 if (i >= skip &&
1464                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1465                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1466                                          OVS_DP_CMD_NEW) < 0)
1467                         break;
1468                 i++;
1469         }
1470
1471         cb->args[0] = i;
1472
1473         return skb->len;
1474 }
1475
1476 static struct genl_ops dp_datapath_genl_ops[] = {
1477         { .cmd = OVS_DP_CMD_NEW,
1478           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1479           .policy = datapath_policy,
1480           .doit = ovs_dp_cmd_new
1481         },
1482         { .cmd = OVS_DP_CMD_DEL,
1483           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1484           .policy = datapath_policy,
1485           .doit = ovs_dp_cmd_del
1486         },
1487         { .cmd = OVS_DP_CMD_GET,
1488           .flags = 0,               /* OK for unprivileged users. */
1489           .policy = datapath_policy,
1490           .doit = ovs_dp_cmd_get,
1491           .dumpit = ovs_dp_cmd_dump
1492         },
1493         { .cmd = OVS_DP_CMD_SET,
1494           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1495           .policy = datapath_policy,
1496           .doit = ovs_dp_cmd_set,
1497         },
1498 };
1499
1500 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1501         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1502         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1503         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1504         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1505         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1506         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1507 };
1508
1509 static struct genl_family dp_vport_genl_family = {
1510         .id = GENL_ID_GENERATE,
1511         .hdrsize = sizeof(struct ovs_header),
1512         .name = OVS_VPORT_FAMILY,
1513         .version = OVS_VPORT_VERSION,
1514         .maxattr = OVS_VPORT_ATTR_MAX,
1515         .netnsok = true
1516 };
1517
1518 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1519         .name = OVS_VPORT_MCGROUP
1520 };
1521
1522 /* Called with RTNL lock or RCU read lock. */
1523 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1524                                    u32 portid, u32 seq, u32 flags, u8 cmd)
1525 {
1526         struct ovs_header *ovs_header;
1527         struct ovs_vport_stats vport_stats;
1528         int err;
1529
1530         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1531                                  flags, cmd);
1532         if (!ovs_header)
1533                 return -EMSGSIZE;
1534
1535         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1536
1537         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1538             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1539             nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1540             nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
1541                 goto nla_put_failure;
1542
1543         ovs_vport_get_stats(vport, &vport_stats);
1544         if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1545                     &vport_stats))
1546                 goto nla_put_failure;
1547
1548         err = ovs_vport_get_options(vport, skb);
1549         if (err == -EMSGSIZE)
1550                 goto error;
1551
1552         return genlmsg_end(skb, ovs_header);
1553
1554 nla_put_failure:
1555         err = -EMSGSIZE;
1556 error:
1557         genlmsg_cancel(skb, ovs_header);
1558         return err;
1559 }
1560
1561 /* Called with RTNL lock or RCU read lock. */
1562 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1563                                          u32 seq, u8 cmd)
1564 {
1565         struct sk_buff *skb;
1566         int retval;
1567
1568         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1569         if (!skb)
1570                 return ERR_PTR(-ENOMEM);
1571
1572         retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1573         if (retval < 0) {
1574                 kfree_skb(skb);
1575                 return ERR_PTR(retval);
1576         }
1577         return skb;
1578 }
1579
1580 /* Called with RTNL lock or RCU read lock. */
1581 static struct vport *lookup_vport(struct net *net,
1582                                   struct ovs_header *ovs_header,
1583                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1584 {
1585         struct datapath *dp;
1586         struct vport *vport;
1587
1588         if (a[OVS_VPORT_ATTR_NAME]) {
1589                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1590                 if (!vport)
1591                         return ERR_PTR(-ENODEV);
1592                 if (ovs_header->dp_ifindex &&
1593                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1594                         return ERR_PTR(-ENODEV);
1595                 return vport;
1596         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1597                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1598
1599                 if (port_no >= DP_MAX_PORTS)
1600                         return ERR_PTR(-EFBIG);
1601
1602                 dp = get_dp(net, ovs_header->dp_ifindex);
1603                 if (!dp)
1604                         return ERR_PTR(-ENODEV);
1605
1606                 vport = ovs_vport_rtnl_rcu(dp, port_no);
1607                 if (!vport)
1608                         return ERR_PTR(-ENOENT);
1609                 return vport;
1610         } else
1611                 return ERR_PTR(-EINVAL);
1612 }
1613
1614 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1615 {
1616         struct nlattr **a = info->attrs;
1617         struct ovs_header *ovs_header = info->userhdr;
1618         struct vport_parms parms;
1619         struct sk_buff *reply;
1620         struct vport *vport;
1621         struct datapath *dp;
1622         u32 port_no;
1623         int err;
1624
1625         err = -EINVAL;
1626         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1627             !a[OVS_VPORT_ATTR_UPCALL_PID])
1628                 goto exit;
1629
1630         rtnl_lock();
1631         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1632         err = -ENODEV;
1633         if (!dp)
1634                 goto exit_unlock;
1635
1636         if (a[OVS_VPORT_ATTR_PORT_NO]) {
1637                 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1638
1639                 err = -EFBIG;
1640                 if (port_no >= DP_MAX_PORTS)
1641                         goto exit_unlock;
1642
1643                 vport = ovs_vport_rtnl_rcu(dp, port_no);
1644                 err = -EBUSY;
1645                 if (vport)
1646                         goto exit_unlock;
1647         } else {
1648                 for (port_no = 1; ; port_no++) {
1649                         if (port_no >= DP_MAX_PORTS) {
1650                                 err = -EFBIG;
1651                                 goto exit_unlock;
1652                         }
1653                         vport = ovs_vport_rtnl(dp, port_no);
1654                         if (!vport)
1655                                 break;
1656                 }
1657         }
1658
1659         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1660         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1661         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1662         parms.dp = dp;
1663         parms.port_no = port_no;
1664         parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1665
1666         vport = new_vport(&parms);
1667         err = PTR_ERR(vport);
1668         if (IS_ERR(vport))
1669                 goto exit_unlock;
1670
1671         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1672                                          OVS_VPORT_CMD_NEW);
1673         if (IS_ERR(reply)) {
1674                 err = PTR_ERR(reply);
1675                 ovs_dp_detach_port(vport);
1676                 goto exit_unlock;
1677         }
1678         genl_notify(reply, genl_info_net(info), info->snd_portid,
1679                     ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1680
1681 exit_unlock:
1682         rtnl_unlock();
1683 exit:
1684         return err;
1685 }
1686
1687 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1688 {
1689         struct nlattr **a = info->attrs;
1690         struct sk_buff *reply;
1691         struct vport *vport;
1692         int err;
1693
1694         rtnl_lock();
1695         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1696         err = PTR_ERR(vport);
1697         if (IS_ERR(vport))
1698                 goto exit_unlock;
1699
1700         err = 0;
1701         if (a[OVS_VPORT_ATTR_TYPE] &&
1702             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type)
1703                 err = -EINVAL;
1704
1705         if (!err && a[OVS_VPORT_ATTR_OPTIONS])
1706                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1707         if (err)
1708                 goto exit_unlock;
1709         if (a[OVS_VPORT_ATTR_UPCALL_PID])
1710                 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1711
1712         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1713                                          OVS_VPORT_CMD_NEW);
1714         if (IS_ERR(reply)) {
1715                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1716                                 ovs_dp_vport_multicast_group.id, PTR_ERR(reply));
1717                 goto exit_unlock;
1718         }
1719
1720         genl_notify(reply, genl_info_net(info), info->snd_portid,
1721                     ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1722
1723 exit_unlock:
1724         rtnl_unlock();
1725         return err;
1726 }
1727
1728 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1729 {
1730         struct nlattr **a = info->attrs;
1731         struct sk_buff *reply;
1732         struct vport *vport;
1733         int err;
1734
1735         rtnl_lock();
1736         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1737         err = PTR_ERR(vport);
1738         if (IS_ERR(vport))
1739                 goto exit_unlock;
1740
1741         if (vport->port_no == OVSP_LOCAL) {
1742                 err = -EINVAL;
1743                 goto exit_unlock;
1744         }
1745
1746         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1747                                          OVS_VPORT_CMD_DEL);
1748         err = PTR_ERR(reply);
1749         if (IS_ERR(reply))
1750                 goto exit_unlock;
1751
1752         ovs_dp_detach_port(vport);
1753
1754         genl_notify(reply, genl_info_net(info), info->snd_portid,
1755                     ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1756
1757 exit_unlock:
1758         rtnl_unlock();
1759         return err;
1760 }
1761
1762 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1763 {
1764         struct nlattr **a = info->attrs;
1765         struct ovs_header *ovs_header = info->userhdr;
1766         struct sk_buff *reply;
1767         struct vport *vport;
1768         int err;
1769
1770         rcu_read_lock();
1771         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1772         err = PTR_ERR(vport);
1773         if (IS_ERR(vport))
1774                 goto exit_unlock;
1775
1776         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1777                                          OVS_VPORT_CMD_NEW);
1778         err = PTR_ERR(reply);
1779         if (IS_ERR(reply))
1780                 goto exit_unlock;
1781
1782         rcu_read_unlock();
1783
1784         return genlmsg_reply(reply, info);
1785
1786 exit_unlock:
1787         rcu_read_unlock();
1788         return err;
1789 }
1790
1791 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1792 {
1793         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1794         struct datapath *dp;
1795         int bucket = cb->args[0], skip = cb->args[1];
1796         int i, j = 0;
1797
1798         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1799         if (!dp)
1800                 return -ENODEV;
1801
1802         rcu_read_lock();
1803         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1804                 struct vport *vport;
1805                 struct hlist_node *n;
1806
1807                 j = 0;
1808                 hlist_for_each_entry_rcu(vport, n, &dp->ports[i], dp_hash_node) {
1809                         if (j >= skip &&
1810                             ovs_vport_cmd_fill_info(vport, skb,
1811                                                     NETLINK_CB(cb->skb).portid,
1812                                                     cb->nlh->nlmsg_seq,
1813                                                     NLM_F_MULTI,
1814                                                     OVS_VPORT_CMD_NEW) < 0)
1815                                 goto out;
1816
1817                         j++;
1818                 }
1819                 skip = 0;
1820         }
1821 out:
1822         rcu_read_unlock();
1823
1824         cb->args[0] = i;
1825         cb->args[1] = j;
1826
1827         return skb->len;
1828 }
1829
1830 static struct genl_ops dp_vport_genl_ops[] = {
1831         { .cmd = OVS_VPORT_CMD_NEW,
1832           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1833           .policy = vport_policy,
1834           .doit = ovs_vport_cmd_new
1835         },
1836         { .cmd = OVS_VPORT_CMD_DEL,
1837           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1838           .policy = vport_policy,
1839           .doit = ovs_vport_cmd_del
1840         },
1841         { .cmd = OVS_VPORT_CMD_GET,
1842           .flags = 0,               /* OK for unprivileged users. */
1843           .policy = vport_policy,
1844           .doit = ovs_vport_cmd_get,
1845           .dumpit = ovs_vport_cmd_dump
1846         },
1847         { .cmd = OVS_VPORT_CMD_SET,
1848           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1849           .policy = vport_policy,
1850           .doit = ovs_vport_cmd_set,
1851         },
1852 };
1853
1854 struct genl_family_and_ops {
1855         struct genl_family *family;
1856         struct genl_ops *ops;
1857         int n_ops;
1858         struct genl_multicast_group *group;
1859 };
1860
1861 static const struct genl_family_and_ops dp_genl_families[] = {
1862         { &dp_datapath_genl_family,
1863           dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1864           &ovs_dp_datapath_multicast_group },
1865         { &dp_vport_genl_family,
1866           dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1867           &ovs_dp_vport_multicast_group },
1868         { &dp_flow_genl_family,
1869           dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1870           &ovs_dp_flow_multicast_group },
1871         { &dp_packet_genl_family,
1872           dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1873           NULL },
1874 };
1875
1876 static void dp_unregister_genl(int n_families)
1877 {
1878         int i;
1879
1880         for (i = 0; i < n_families; i++)
1881                 genl_unregister_family(dp_genl_families[i].family);
1882 }
1883
1884 static int dp_register_genl(void)
1885 {
1886         int n_registered;
1887         int err;
1888         int i;
1889
1890         n_registered = 0;
1891         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1892                 const struct genl_family_and_ops *f = &dp_genl_families[i];
1893
1894                 err = genl_register_family_with_ops(f->family, f->ops,
1895                                                     f->n_ops);
1896                 if (err)
1897                         goto error;
1898                 n_registered++;
1899
1900                 if (f->group) {
1901                         err = genl_register_mc_group(f->family, f->group);
1902                         if (err)
1903                                 goto error;
1904                 }
1905         }
1906
1907         return 0;
1908
1909 error:
1910         dp_unregister_genl(n_registered);
1911         return err;
1912 }
1913
1914 static void rehash_flow_table(struct work_struct *work)
1915 {
1916         struct datapath *dp;
1917         struct net *net;
1918
1919         genl_lock();
1920         rtnl_lock();
1921         for_each_net(net) {
1922                 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1923
1924                 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1925                         struct flow_table *old_table = genl_dereference(dp->table);
1926                         struct flow_table *new_table;
1927
1928                         new_table = ovs_flow_tbl_rehash(old_table);
1929                         if (!IS_ERR(new_table)) {
1930                                 rcu_assign_pointer(dp->table, new_table);
1931                                 ovs_flow_tbl_deferred_destroy(old_table);
1932                         }
1933                 }
1934         }
1935         rtnl_unlock();
1936         genl_unlock();
1937
1938         schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1939 }
1940
1941 static int __net_init ovs_init_net(struct net *net)
1942 {
1943         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1944
1945         INIT_LIST_HEAD(&ovs_net->dps);
1946         return 0;
1947 }
1948
1949 static void __net_exit ovs_exit_net(struct net *net)
1950 {
1951         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1952         struct datapath *dp, *dp_next;
1953
1954         genl_lock();
1955         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
1956                 __dp_destroy(dp);
1957         genl_unlock();
1958 }
1959
1960 static struct pernet_operations ovs_net_ops = {
1961         .init = ovs_init_net,
1962         .exit = ovs_exit_net,
1963         .id   = &ovs_net_id,
1964         .size = sizeof(struct ovs_net),
1965 };
1966
1967 static int __init dp_init(void)
1968 {
1969         struct sk_buff *dummy_skb;
1970         int err;
1971
1972         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
1973
1974         pr_info("Open vSwitch switching datapath\n");
1975
1976         err = ovs_flow_init();
1977         if (err)
1978                 goto error;
1979
1980         err = ovs_vport_init();
1981         if (err)
1982                 goto error_flow_exit;
1983
1984         err = register_pernet_device(&ovs_net_ops);
1985         if (err)
1986                 goto error_vport_exit;
1987
1988         err = register_netdevice_notifier(&ovs_dp_device_notifier);
1989         if (err)
1990                 goto error_netns_exit;
1991
1992         err = dp_register_genl();
1993         if (err < 0)
1994                 goto error_unreg_notifier;
1995
1996         schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1997
1998         return 0;
1999
2000 error_unreg_notifier:
2001         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2002 error_netns_exit:
2003         unregister_pernet_device(&ovs_net_ops);
2004 error_vport_exit:
2005         ovs_vport_exit();
2006 error_flow_exit:
2007         ovs_flow_exit();
2008 error:
2009         return err;
2010 }
2011
2012 static void dp_cleanup(void)
2013 {
2014         cancel_delayed_work_sync(&rehash_flow_wq);
2015         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2016         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2017         unregister_pernet_device(&ovs_net_ops);
2018         rcu_barrier();
2019         ovs_vport_exit();
2020         ovs_flow_exit();
2021 }
2022
2023 module_init(dp_init);
2024 module_exit(dp_cleanup);
2025
2026 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2027 MODULE_LICENSE("GPL");