Pileus Git - ~andy/linux/blob - 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_head *head;
 162
 163         head = vport_hash_bucket(dp, port_no);
 164         hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
 165                 if (vport->port_no == port_no)
 166                         return vport;
 167         }
 168         return NULL;
 169 }
 170
 171 /* Called with RTNL lock and genl_lock. */
 172 static struct vport *new_vport(const struct vport_parms *parms)
 173 {
 174         struct vport *vport;
 175
 176         vport = ovs_vport_add(parms);
 177         if (!IS_ERR(vport)) {
 178                 struct datapath *dp = parms->dp;
 179                 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
 180
 181                 hlist_add_head_rcu(&vport->dp_hash_node, head);
 182         }
 183
 184         return vport;
 185 }
 186
 187 /* Called with RTNL lock. */
 188 void ovs_dp_detach_port(struct vport *p)
 189 {
 190         ASSERT_RTNL();
 191
 192         /* First drop references to device. */
 193         hlist_del_rcu(&p->dp_hash_node);
 194
 195         /* Then destroy it. */
 196         ovs_vport_del(p);
 197 }
 198
 199 /* Must be called with rcu_read_lock. */
 200 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
 201 {
 202         struct datapath *dp = p->dp;
 203         struct sw_flow *flow;
 204         struct dp_stats_percpu *stats;
 205         struct sw_flow_key key;
 206         u64 *stats_counter;
 207         int error;
 208         int key_len;
 209
 210         stats = this_cpu_ptr(dp->stats_percpu);
 211
 212         /* Extract flow from 'skb' into 'key'. */
 213         error = ovs_flow_extract(skb, p->port_no, &key, &key_len);
 214         if (unlikely(error)) {
 215                 kfree_skb(skb);
 216                 return;
 217         }
 218
 219         /* Look up flow. */
 220         flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len);
 221         if (unlikely(!flow)) {
 222                 struct dp_upcall_info upcall;
 223
 224                 upcall.cmd = OVS_PACKET_CMD_MISS;
 225                 upcall.key = &key;
 226                 upcall.userdata = NULL;
 227                 upcall.portid = p->upcall_portid;
 228                 ovs_dp_upcall(dp, skb, &upcall);
 229                 consume_skb(skb);
 230                 stats_counter = &stats->n_missed;
 231                 goto out;
 232         }
 233
 234         OVS_CB(skb)->flow = flow;
 235
 236         stats_counter = &stats->n_hit;
 237         ovs_flow_used(OVS_CB(skb)->flow, skb);
 238         ovs_execute_actions(dp, skb);
 239
 240 out:
 241         /* Update datapath statistics. */
 242         u64_stats_update_begin(&stats->sync);
 243         (*stats_counter)++;
 244         u64_stats_update_end(&stats->sync);
 245 }
 246
 247 static struct genl_family dp_packet_genl_family = {
 248         .id = GENL_ID_GENERATE,
 249         .hdrsize = sizeof(struct ovs_header),
 250         .name = OVS_PACKET_FAMILY,
 251         .version = OVS_PACKET_VERSION,
 252         .maxattr = OVS_PACKET_ATTR_MAX,
 253         .netnsok = true
 254 };
 255
 256 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
 257                   const struct dp_upcall_info *upcall_info)
 258 {
 259         struct dp_stats_percpu *stats;
 260         int dp_ifindex;
 261         int err;
 262
 263         if (upcall_info->portid == 0) {
 264                 err = -ENOTCONN;
 265                 goto err;
 266         }
 267
 268         dp_ifindex = get_dpifindex(dp);
 269         if (!dp_ifindex) {
 270                 err = -ENODEV;
 271                 goto err;
 272         }
 273
 274         if (!skb_is_gso(skb))
 275                 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
 276         else
 277                 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
 278         if (err)
 279                 goto err;
 280
 281         return 0;
 282
 283 err:
 284         stats = this_cpu_ptr(dp->stats_percpu);
 285
 286         u64_stats_update_begin(&stats->sync);
 287         stats->n_lost++;
 288         u64_stats_update_end(&stats->sync);
 289
 290         return err;
 291 }
 292
 293 static int queue_gso_packets(struct net *net, int dp_ifindex,
 294                              struct sk_buff *skb,
 295                              const struct dp_upcall_info *upcall_info)
 296 {
 297         unsigned short gso_type = skb_shinfo(skb)->gso_type;
 298         struct dp_upcall_info later_info;
 299         struct sw_flow_key later_key;
 300         struct sk_buff *segs, *nskb;
 301         int err;
 302
 303         segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false);
 304         if (IS_ERR(segs))
 305                 return PTR_ERR(segs);
 306
 307         /* Queue all of the segments. */
 308         skb = segs;
 309         do {
 310                 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
 311                 if (err)
 312                         break;
 313
 314                 if (skb == segs && gso_type & SKB_GSO_UDP) {
 315                         /* The initial flow key extracted by ovs_flow_extract()
 316                          * in this case is for a first fragment, so we need to
 317                          * properly mark later fragments.
 318                          */
 319                         later_key = *upcall_info->key;
 320                         later_key.ip.frag = OVS_FRAG_TYPE_LATER;
 321
 322                         later_info = *upcall_info;
 323                         later_info.key = &later_key;
 324                         upcall_info = &later_info;
 325                 }
 326         } while ((skb = skb->next));
 327
 328         /* Free all of the segments. */
 329         skb = segs;
 330         do {
 331                 nskb = skb->next;
 332                 if (err)
 333                         kfree_skb(skb);
 334                 else
 335                         consume_skb(skb);
 336         } while ((skb = nskb));
 337         return err;
 338 }
 339
 340 static int queue_userspace_packet(struct net *net, int dp_ifindex,
 341                                   struct sk_buff *skb,
 342                                   const struct dp_upcall_info *upcall_info)
 343 {
 344         struct ovs_header *upcall;
 345         struct sk_buff *nskb = NULL;
 346         struct sk_buff *user_skb; /* to be queued to userspace */
 347         struct nlattr *nla;
 348         unsigned int len;
 349         int err;
 350
 351         if (vlan_tx_tag_present(skb)) {
 352                 nskb = skb_clone(skb, GFP_ATOMIC);
 353                 if (!nskb)
 354                         return -ENOMEM;
 355
 356                 nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb));
 357                 if (!nskb)
 358                         return -ENOMEM;
 359
 360                 nskb->vlan_tci = 0;
 361                 skb = nskb;
 362         }
 363
 364         if (nla_attr_size(skb->len) > USHRT_MAX) {
 365                 err = -EFBIG;
 366                 goto out;
 367         }
 368
 369         len = sizeof(struct ovs_header);
 370         len += nla_total_size(skb->len);
 371         len += nla_total_size(FLOW_BUFSIZE);
 372         if (upcall_info->userdata)
 373                 len += NLA_ALIGN(upcall_info->userdata->nla_len);
 374
 375         user_skb = genlmsg_new(len, GFP_ATOMIC);
 376         if (!user_skb) {
 377                 err = -ENOMEM;
 378                 goto out;
 379         }
 380
 381         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
 382                              0, upcall_info->cmd);
 383         upcall->dp_ifindex = dp_ifindex;
 384
 385         nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
 386         ovs_flow_to_nlattrs(upcall_info->key, user_skb);
 387         nla_nest_end(user_skb, nla);
 388
 389         if (upcall_info->userdata)
 390                 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
 391                           nla_len(upcall_info->userdata),
 392                           nla_data(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         genlmsg_end(user_skb, upcall);
 399         err = genlmsg_unicast(net, user_skb, upcall_info->portid);
 400
 401 out:
 402         kfree_skb(nskb);
 403         return err;
 404 }
 405
 406 /* Called with genl_mutex. */
 407 static int flush_flows(struct datapath *dp)
 408 {
 409         struct flow_table *old_table;
 410         struct flow_table *new_table;
 411
 412         old_table = genl_dereference(dp->table);
 413         new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
 414         if (!new_table)
 415                 return -ENOMEM;
 416
 417         rcu_assign_pointer(dp->table, new_table);
 418
 419         ovs_flow_tbl_deferred_destroy(old_table);
 420         return 0;
 421 }
 422
 423 static int validate_actions(const struct nlattr *attr,
 424                                 const struct sw_flow_key *key, int depth);
 425
 426 static int validate_sample(const struct nlattr *attr,
 427                                 const struct sw_flow_key *key, int depth)
 428 {
 429         const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
 430         const struct nlattr *probability, *actions;
 431         const struct nlattr *a;
 432         int rem;
 433
 434         memset(attrs, 0, sizeof(attrs));
 435         nla_for_each_nested(a, attr, rem) {
 436                 int type = nla_type(a);
 437                 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
 438                         return -EINVAL;
 439                 attrs[type] = a;
 440         }
 441         if (rem)
 442                 return -EINVAL;
 443
 444         probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
 445         if (!probability || nla_len(probability) != sizeof(u32))
 446                 return -EINVAL;
 447
 448         actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
 449         if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
 450                 return -EINVAL;
 451         return validate_actions(actions, key, depth + 1);
 452 }
 453
 454 static int validate_tp_port(const struct sw_flow_key *flow_key)
 455 {
 456         if (flow_key->eth.type == htons(ETH_P_IP)) {
 457                 if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst)
 458                         return 0;
 459         } else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
 460                 if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst)
 461                         return 0;
 462         }
 463
 464         return -EINVAL;
 465 }
 466
 467 static int validate_set(const struct nlattr *a,
 468                         const struct sw_flow_key *flow_key)
 469 {
 470         const struct nlattr *ovs_key = nla_data(a);
 471         int key_type = nla_type(ovs_key);
 472
 473         /* There can be only one key in a action */
 474         if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
 475                 return -EINVAL;
 476
 477         if (key_type > OVS_KEY_ATTR_MAX ||
 478             nla_len(ovs_key) != ovs_key_lens[key_type])
 479                 return -EINVAL;
 480
 481         switch (key_type) {
 482         const struct ovs_key_ipv4 *ipv4_key;
 483         const struct ovs_key_ipv6 *ipv6_key;
 484
 485         case OVS_KEY_ATTR_PRIORITY:
 486         case OVS_KEY_ATTR_SKB_MARK:
 487         case OVS_KEY_ATTR_ETHERNET:
 488                 break;
 489
 490         case OVS_KEY_ATTR_IPV4:
 491                 if (flow_key->eth.type != htons(ETH_P_IP))
 492                         return -EINVAL;
 493
 494                 if (!flow_key->ip.proto)
 495                         return -EINVAL;
 496
 497                 ipv4_key = nla_data(ovs_key);
 498                 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
 499                         return -EINVAL;
 500
 501                 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
 502                         return -EINVAL;
 503
 504                 break;
 505
 506         case OVS_KEY_ATTR_IPV6:
 507                 if (flow_key->eth.type != htons(ETH_P_IPV6))
 508                         return -EINVAL;
 509
 510                 if (!flow_key->ip.proto)
 511                         return -EINVAL;
 512
 513                 ipv6_key = nla_data(ovs_key);
 514                 if (ipv6_key->ipv6_proto != flow_key->ip.proto)
 515                         return -EINVAL;
 516
 517                 if (ipv6_key->ipv6_frag != flow_key->ip.frag)
 518                         return -EINVAL;
 519
 520                 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
 521                         return -EINVAL;
 522
 523                 break;
 524
 525         case OVS_KEY_ATTR_TCP:
 526                 if (flow_key->ip.proto != IPPROTO_TCP)
 527                         return -EINVAL;
 528
 529                 return validate_tp_port(flow_key);
 530
 531         case OVS_KEY_ATTR_UDP:
 532                 if (flow_key->ip.proto != IPPROTO_UDP)
 533                         return -EINVAL;
 534
 535                 return validate_tp_port(flow_key);
 536
 537         default:
 538                 return -EINVAL;
 539         }
 540
 541         return 0;
 542 }
 543
 544 static int validate_userspace(const struct nlattr *attr)
 545 {
 546         static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] =   {
 547                 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
 548                 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
 549         };
 550         struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
 551         int error;
 552
 553         error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
 554                                  attr, userspace_policy);
 555         if (error)
 556                 return error;
 557
 558         if (!a[OVS_USERSPACE_ATTR_PID] ||
 559             !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
 560                 return -EINVAL;
 561
 562         return 0;
 563 }
 564
 565 static int validate_actions(const struct nlattr *attr,
 566                                 const struct sw_flow_key *key,  int depth)
 567 {
 568         const struct nlattr *a;
 569         int rem, err;
 570
 571         if (depth >= SAMPLE_ACTION_DEPTH)
 572                 return -EOVERFLOW;
 573
 574         nla_for_each_nested(a, attr, rem) {
 575                 /* Expected argument lengths, (u32)-1 for variable length. */
 576                 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
 577                         [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
 578                         [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
 579                         [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
 580                         [OVS_ACTION_ATTR_POP_VLAN] = 0,
 581                         [OVS_ACTION_ATTR_SET] = (u32)-1,
 582                         [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
 583                 };
 584                 const struct ovs_action_push_vlan *vlan;
 585                 int type = nla_type(a);
 586
 587                 if (type > OVS_ACTION_ATTR_MAX ||
 588                     (action_lens[type] != nla_len(a) &&
 589                      action_lens[type] != (u32)-1))
 590                         return -EINVAL;
 591
 592                 switch (type) {
 593                 case OVS_ACTION_ATTR_UNSPEC:
 594                         return -EINVAL;
 595
 596                 case OVS_ACTION_ATTR_USERSPACE:
 597                         err = validate_userspace(a);
 598                         if (err)
 599                                 return err;
 600                         break;
 601
 602                 case OVS_ACTION_ATTR_OUTPUT:
 603                         if (nla_get_u32(a) >= DP_MAX_PORTS)
 604                                 return -EINVAL;
 605                         break;
 606
 607
 608                 case OVS_ACTION_ATTR_POP_VLAN:
 609                         break;
 610
 611                 case OVS_ACTION_ATTR_PUSH_VLAN:
 612                         vlan = nla_data(a);
 613                         if (vlan->vlan_tpid != htons(ETH_P_8021Q))
 614                                 return -EINVAL;
 615                         if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
 616                                 return -EINVAL;
 617                         break;
 618
 619                 case OVS_ACTION_ATTR_SET:
 620                         err = validate_set(a, key);
 621                         if (err)
 622                                 return err;
 623                         break;
 624
 625                 case OVS_ACTION_ATTR_SAMPLE:
 626                         err = validate_sample(a, key, depth);
 627                         if (err)
 628                                 return err;
 629                         break;
 630
 631                 default:
 632                         return -EINVAL;
 633                 }
 634         }
 635
 636         if (rem > 0)
 637                 return -EINVAL;
 638
 639         return 0;
 640 }
 641
 642 static void clear_stats(struct sw_flow *flow)
 643 {
 644         flow->used = 0;
 645         flow->tcp_flags = 0;
 646         flow->packet_count = 0;
 647         flow->byte_count = 0;
 648 }
 649
 650 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 651 {
 652         struct ovs_header *ovs_header = info->userhdr;
 653         struct nlattr **a = info->attrs;
 654         struct sw_flow_actions *acts;
 655         struct sk_buff *packet;
 656         struct sw_flow *flow;
 657         struct datapath *dp;
 658         struct ethhdr *eth;
 659         int len;
 660         int err;
 661         int key_len;
 662
 663         err = -EINVAL;
 664         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 665             !a[OVS_PACKET_ATTR_ACTIONS] ||
 666             nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN)
 667                 goto err;
 668
 669         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 670         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 671         err = -ENOMEM;
 672         if (!packet)
 673                 goto err;
 674         skb_reserve(packet, NET_IP_ALIGN);
 675
 676         memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len);
 677
 678         skb_reset_mac_header(packet);
 679         eth = eth_hdr(packet);
 680
 681         /* Normally, setting the skb 'protocol' field would be handled by a
 682          * call to eth_type_trans(), but it assumes there's a sending
 683          * device, which we may not have. */
 684         if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
 685                 packet->protocol = eth->h_proto;
 686         else
 687                 packet->protocol = htons(ETH_P_802_2);
 688
 689         /* Build an sw_flow for sending this packet. */
 690         flow = ovs_flow_alloc();
 691         err = PTR_ERR(flow);
 692         if (IS_ERR(flow))
 693                 goto err_kfree_skb;
 694
 695         err = ovs_flow_extract(packet, -1, &flow->key, &key_len);
 696         if (err)
 697                 goto err_flow_free;
 698
 699         err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority,
 700                                              &flow->key.phy.skb_mark,
 701                                              &flow->key.phy.in_port,
 702                                              a[OVS_PACKET_ATTR_KEY]);
 703         if (err)
 704                 goto err_flow_free;
 705
 706         err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0);
 707         if (err)
 708                 goto err_flow_free;
 709
 710         flow->hash = ovs_flow_hash(&flow->key, key_len);
 711
 712         acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]);
 713         err = PTR_ERR(acts);
 714         if (IS_ERR(acts))
 715                 goto err_flow_free;
 716         rcu_assign_pointer(flow->sf_acts, acts);
 717
 718         OVS_CB(packet)->flow = flow;
 719         packet->priority = flow->key.phy.priority;
 720         packet->mark = flow->key.phy.skb_mark;
 721
 722         rcu_read_lock();
 723         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 724         err = -ENODEV;
 725         if (!dp)
 726                 goto err_unlock;
 727
 728         local_bh_disable();
 729         err = ovs_execute_actions(dp, packet);
 730         local_bh_enable();
 731         rcu_read_unlock();
 732
 733         ovs_flow_free(flow);
 734         return err;
 735
 736 err_unlock:
 737         rcu_read_unlock();
 738 err_flow_free:
 739         ovs_flow_free(flow);
 740 err_kfree_skb:
 741         kfree_skb(packet);
 742 err:
 743         return err;
 744 }
 745
 746 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 747         [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
 748         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 749         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 750 };
 751
 752 static struct genl_ops dp_packet_genl_ops[] = {
 753         { .cmd = OVS_PACKET_CMD_EXECUTE,
 754           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 755           .policy = packet_policy,
 756           .doit = ovs_packet_cmd_execute
 757         }
 758 };
 759
 760 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
 761 {
 762         int i;
 763         struct flow_table *table = genl_dereference(dp->table);
 764
 765         stats->n_flows = ovs_flow_tbl_count(table);
 766
 767         stats->n_hit = stats->n_missed = stats->n_lost = 0;
 768         for_each_possible_cpu(i) {
 769                 const struct dp_stats_percpu *percpu_stats;
 770                 struct dp_stats_percpu local_stats;
 771                 unsigned int start;
 772
 773                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 774
 775                 do {
 776                         start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
 777                         local_stats = *percpu_stats;
 778                 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
 779
 780                 stats->n_hit += local_stats.n_hit;
 781                 stats->n_missed += local_stats.n_missed;
 782                 stats->n_lost += local_stats.n_lost;
 783         }
 784 }
 785
 786 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
 787         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
 788         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
 789         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
 790 };
 791
 792 static struct genl_family dp_flow_genl_family = {
 793         .id = GENL_ID_GENERATE,
 794         .hdrsize = sizeof(struct ovs_header),
 795         .name = OVS_FLOW_FAMILY,
 796         .version = OVS_FLOW_VERSION,
 797         .maxattr = OVS_FLOW_ATTR_MAX,
 798         .netnsok = true
 799 };
 800
 801 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
 802         .name = OVS_FLOW_MCGROUP
 803 };
 804
 805 /* Called with genl_lock. */
 806 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
 807                                   struct sk_buff *skb, u32 portid,
 808                                   u32 seq, u32 flags, u8 cmd)
 809 {
 810         const int skb_orig_len = skb->len;
 811         const struct sw_flow_actions *sf_acts;
 812         struct ovs_flow_stats stats;
 813         struct ovs_header *ovs_header;
 814         struct nlattr *nla;
 815         unsigned long used;
 816         u8 tcp_flags;
 817         int err;
 818
 819         sf_acts = rcu_dereference_protected(flow->sf_acts,
 820                                             lockdep_genl_is_held());
 821
 822         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
 823         if (!ovs_header)
 824                 return -EMSGSIZE;
 825
 826         ovs_header->dp_ifindex = get_dpifindex(dp);
 827
 828         nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
 829         if (!nla)
 830                 goto nla_put_failure;
 831         err = ovs_flow_to_nlattrs(&flow->key, skb);
 832         if (err)
 833                 goto error;
 834         nla_nest_end(skb, nla);
 835
 836         spin_lock_bh(&flow->lock);
 837         used = flow->used;
 838         stats.n_packets = flow->packet_count;
 839         stats.n_bytes = flow->byte_count;
 840         tcp_flags = flow->tcp_flags;
 841         spin_unlock_bh(&flow->lock);
 842
 843         if (used &&
 844             nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
 845                 goto nla_put_failure;
 846
 847         if (stats.n_packets &&
 848             nla_put(skb, OVS_FLOW_ATTR_STATS,
 849                     sizeof(struct ovs_flow_stats), &stats))
 850                 goto nla_put_failure;
 851
 852         if (tcp_flags &&
 853             nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
 854                 goto nla_put_failure;
 855
 856         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 857          * this is the first flow to be dumped into 'skb'.  This is unusual for
 858          * Netlink but individual action lists can be longer than
 859          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 860          * The userspace caller can always fetch the actions separately if it
 861          * really wants them.  (Most userspace callers in fact don't care.)
 862          *
 863          * This can only fail for dump operations because the skb is always
 864          * properly sized for single flows.
 865          */
 866         err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
 867                       sf_acts->actions);
 868         if (err < 0 && skb_orig_len)
 869                 goto error;
 870
 871         return genlmsg_end(skb, ovs_header);
 872
 873 nla_put_failure:
 874         err = -EMSGSIZE;
 875 error:
 876         genlmsg_cancel(skb, ovs_header);
 877         return err;
 878 }
 879
 880 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
 881 {
 882         const struct sw_flow_actions *sf_acts;
 883         int len;
 884
 885         sf_acts = rcu_dereference_protected(flow->sf_acts,
 886                                             lockdep_genl_is_held());
 887
 888         /* OVS_FLOW_ATTR_KEY */
 889         len = nla_total_size(FLOW_BUFSIZE);
 890         /* OVS_FLOW_ATTR_ACTIONS */
 891         len += nla_total_size(sf_acts->actions_len);
 892         /* OVS_FLOW_ATTR_STATS */
 893         len += nla_total_size(sizeof(struct ovs_flow_stats));
 894         /* OVS_FLOW_ATTR_TCP_FLAGS */
 895         len += nla_total_size(1);
 896         /* OVS_FLOW_ATTR_USED */
 897         len += nla_total_size(8);
 898
 899         len += NLMSG_ALIGN(sizeof(struct ovs_header));
 900
 901         return genlmsg_new(len, GFP_KERNEL);
 902 }
 903
 904 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
 905                                                struct datapath *dp,
 906                                                u32 portid, u32 seq, u8 cmd)
 907 {
 908         struct sk_buff *skb;
 909         int retval;
 910
 911         skb = ovs_flow_cmd_alloc_info(flow);
 912         if (!skb)
 913                 return ERR_PTR(-ENOMEM);
 914
 915         retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
 916         BUG_ON(retval < 0);
 917         return skb;
 918 }
 919
 920 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
 921 {
 922         struct nlattr **a = info->attrs;
 923         struct ovs_header *ovs_header = info->userhdr;
 924         struct sw_flow_key key;
 925         struct sw_flow *flow;
 926         struct sk_buff *reply;
 927         struct datapath *dp;
 928         struct flow_table *table;
 929         int error;
 930         int key_len;
 931
 932         /* Extract key. */
 933         error = -EINVAL;
 934         if (!a[OVS_FLOW_ATTR_KEY])
 935                 goto error;
 936         error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
 937         if (error)
 938                 goto error;
 939
 940         /* Validate actions. */
 941         if (a[OVS_FLOW_ATTR_ACTIONS]) {
 942                 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key,  0);
 943                 if (error)
 944                         goto error;
 945         } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
 946                 error = -EINVAL;
 947                 goto error;
 948         }
 949
 950         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 951         error = -ENODEV;
 952         if (!dp)
 953                 goto error;
 954
 955         table = genl_dereference(dp->table);
 956         flow = ovs_flow_tbl_lookup(table, &key, key_len);
 957         if (!flow) {
 958                 struct sw_flow_actions *acts;
 959
 960                 /* Bail out if we're not allowed to create a new flow. */
 961                 error = -ENOENT;
 962                 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
 963                         goto error;
 964
 965                 /* Expand table, if necessary, to make room. */
 966                 if (ovs_flow_tbl_need_to_expand(table)) {
 967                         struct flow_table *new_table;
 968
 969                         new_table = ovs_flow_tbl_expand(table);
 970                         if (!IS_ERR(new_table)) {
 971                                 rcu_assign_pointer(dp->table, new_table);
 972                                 ovs_flow_tbl_deferred_destroy(table);
 973                                 table = genl_dereference(dp->table);
 974                         }
 975                 }
 976
 977                 /* Allocate flow. */
 978                 flow = ovs_flow_alloc();
 979                 if (IS_ERR(flow)) {
 980                         error = PTR_ERR(flow);
 981                         goto error;
 982                 }
 983                 flow->key = key;
 984                 clear_stats(flow);
 985
 986                 /* Obtain actions. */
 987                 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
 988                 error = PTR_ERR(acts);
 989                 if (IS_ERR(acts))
 990                         goto error_free_flow;
 991                 rcu_assign_pointer(flow->sf_acts, acts);
 992
 993                 /* Put flow in bucket. */
 994                 flow->hash = ovs_flow_hash(&key, key_len);
 995                 ovs_flow_tbl_insert(table, flow);
 996
 997                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
 998                                                 info->snd_seq,
 999                                                 OVS_FLOW_CMD_NEW);
1000         } else {
1001                 /* We found a matching flow. */
1002                 struct sw_flow_actions *old_acts;
1003                 struct nlattr *acts_attrs;
1004
1005                 /* Bail out if we're not allowed to modify an existing flow.
1006                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1007                  * because Generic Netlink treats the latter as a dump
1008                  * request.  We also accept NLM_F_EXCL in case that bug ever
1009                  * gets fixed.
1010                  */
1011                 error = -EEXIST;
1012                 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
1013                     info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
1014                         goto error;
1015
1016                 /* Update actions. */
1017                 old_acts = rcu_dereference_protected(flow->sf_acts,
1018                                                      lockdep_genl_is_held());
1019                 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS];
1020                 if (acts_attrs &&
1021                    (old_acts->actions_len != nla_len(acts_attrs) ||
1022                    memcmp(old_acts->actions, nla_data(acts_attrs),
1023                           old_acts->actions_len))) {
1024                         struct sw_flow_actions *new_acts;
1025
1026                         new_acts = ovs_flow_actions_alloc(acts_attrs);
1027                         error = PTR_ERR(new_acts);
1028                         if (IS_ERR(new_acts))
1029                                 goto error;
1030
1031                         rcu_assign_pointer(flow->sf_acts, new_acts);
1032                         ovs_flow_deferred_free_acts(old_acts);
1033                 }
1034
1035                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1036                                                info->snd_seq, OVS_FLOW_CMD_NEW);
1037
1038                 /* Clear stats. */
1039                 if (a[OVS_FLOW_ATTR_CLEAR]) {
1040                         spin_lock_bh(&flow->lock);
1041                         clear_stats(flow);
1042                         spin_unlock_bh(&flow->lock);
1043                 }
1044         }
1045
1046         if (!IS_ERR(reply))
1047                 genl_notify(reply, genl_info_net(info), info->snd_portid,
1048                            ovs_dp_flow_multicast_group.id, info->nlhdr,
1049                            GFP_KERNEL);
1050         else
1051                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1052                                 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
1053         return 0;
1054
1055 error_free_flow:
1056         ovs_flow_free(flow);
1057 error:
1058         return error;
1059 }
1060
1061 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1062 {
1063         struct nlattr **a = info->attrs;
1064         struct ovs_header *ovs_header = info->userhdr;
1065         struct sw_flow_key key;
1066         struct sk_buff *reply;
1067         struct sw_flow *flow;
1068         struct datapath *dp;
1069         struct flow_table *table;
1070         int err;
1071         int key_len;
1072
1073         if (!a[OVS_FLOW_ATTR_KEY])
1074                 return -EINVAL;
1075         err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1076         if (err)
1077                 return err;
1078
1079         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1080         if (!dp)
1081                 return -ENODEV;
1082
1083         table = genl_dereference(dp->table);
1084         flow = ovs_flow_tbl_lookup(table, &key, key_len);
1085         if (!flow)
1086                 return -ENOENT;
1087
1088         reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1089                                         info->snd_seq, OVS_FLOW_CMD_NEW);
1090         if (IS_ERR(reply))
1091                 return PTR_ERR(reply);
1092
1093         return genlmsg_reply(reply, info);
1094 }
1095
1096 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1097 {
1098         struct nlattr **a = info->attrs;
1099         struct ovs_header *ovs_header = info->userhdr;
1100         struct sw_flow_key key;
1101         struct sk_buff *reply;
1102         struct sw_flow *flow;
1103         struct datapath *dp;
1104         struct flow_table *table;
1105         int err;
1106         int key_len;
1107
1108         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1109         if (!dp)
1110                 return -ENODEV;
1111
1112         if (!a[OVS_FLOW_ATTR_KEY])
1113                 return flush_flows(dp);
1114
1115         err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1116         if (err)
1117                 return err;
1118
1119         table = genl_dereference(dp->table);
1120         flow = ovs_flow_tbl_lookup(table, &key, key_len);
1121         if (!flow)
1122                 return -ENOENT;
1123
1124         reply = ovs_flow_cmd_alloc_info(flow);
1125         if (!reply)
1126                 return -ENOMEM;
1127
1128         ovs_flow_tbl_remove(table, flow);
1129
1130         err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
1131                                      info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1132         BUG_ON(err < 0);
1133
1134         ovs_flow_deferred_free(flow);
1135
1136         genl_notify(reply, genl_info_net(info), info->snd_portid,
1137                     ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1138         return 0;
1139 }
1140
1141 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1142 {
1143         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1144         struct datapath *dp;
1145         struct flow_table *table;
1146
1147         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1148         if (!dp)
1149                 return -ENODEV;
1150
1151         table = genl_dereference(dp->table);
1152
1153         for (;;) {
1154                 struct sw_flow *flow;
1155                 u32 bucket, obj;
1156
1157                 bucket = cb->args[0];
1158                 obj = cb->args[1];
1159                 flow = ovs_flow_tbl_next(table, &bucket, &obj);
1160                 if (!flow)
1161                         break;
1162
1163                 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1164                                            NETLINK_CB(cb->skb).portid,
1165                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1166                                            OVS_FLOW_CMD_NEW) < 0)
1167                         break;
1168
1169                 cb->args[0] = bucket;
1170                 cb->args[1] = obj;
1171         }
1172         return skb->len;
1173 }
1174
1175 static struct genl_ops dp_flow_genl_ops[] = {
1176         { .cmd = OVS_FLOW_CMD_NEW,
1177           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1178           .policy = flow_policy,
1179           .doit = ovs_flow_cmd_new_or_set
1180         },
1181         { .cmd = OVS_FLOW_CMD_DEL,
1182           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1183           .policy = flow_policy,
1184           .doit = ovs_flow_cmd_del
1185         },
1186         { .cmd = OVS_FLOW_CMD_GET,
1187           .flags = 0,               /* OK for unprivileged users. */
1188           .policy = flow_policy,
1189           .doit = ovs_flow_cmd_get,
1190           .dumpit = ovs_flow_cmd_dump
1191         },
1192         { .cmd = OVS_FLOW_CMD_SET,
1193           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1194           .policy = flow_policy,
1195           .doit = ovs_flow_cmd_new_or_set,
1196         },
1197 };
1198
1199 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1200         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1201         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1202 };
1203
1204 static struct genl_family dp_datapath_genl_family = {
1205         .id = GENL_ID_GENERATE,
1206         .hdrsize = sizeof(struct ovs_header),
1207         .name = OVS_DATAPATH_FAMILY,
1208         .version = OVS_DATAPATH_VERSION,
1209         .maxattr = OVS_DP_ATTR_MAX,
1210         .netnsok = true
1211 };
1212
1213 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1214         .name = OVS_DATAPATH_MCGROUP
1215 };
1216
1217 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1218                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1219 {
1220         struct ovs_header *ovs_header;
1221         struct ovs_dp_stats dp_stats;
1222         int err;
1223
1224         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1225                                    flags, cmd);
1226         if (!ovs_header)
1227                 goto error;
1228
1229         ovs_header->dp_ifindex = get_dpifindex(dp);
1230
1231         rcu_read_lock();
1232         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1233         rcu_read_unlock();
1234         if (err)
1235                 goto nla_put_failure;
1236
1237         get_dp_stats(dp, &dp_stats);
1238         if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
1239                 goto nla_put_failure;
1240
1241         return genlmsg_end(skb, ovs_header);
1242
1243 nla_put_failure:
1244         genlmsg_cancel(skb, ovs_header);
1245 error:
1246         return -EMSGSIZE;
1247 }
1248
1249 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
1250                                              u32 seq, u8 cmd)
1251 {
1252         struct sk_buff *skb;
1253         int retval;
1254
1255         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1256         if (!skb)
1257                 return ERR_PTR(-ENOMEM);
1258
1259         retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
1260         if (retval < 0) {
1261                 kfree_skb(skb);
1262                 return ERR_PTR(retval);
1263         }
1264         return skb;
1265 }
1266
1267 /* Called with genl_mutex and optionally with RTNL lock also. */
1268 static struct datapath *lookup_datapath(struct net *net,
1269                                         struct ovs_header *ovs_header,
1270                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1271 {
1272         struct datapath *dp;
1273
1274         if (!a[OVS_DP_ATTR_NAME])
1275                 dp = get_dp(net, ovs_header->dp_ifindex);
1276         else {
1277                 struct vport *vport;
1278
1279                 rcu_read_lock();
1280                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1281                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1282                 rcu_read_unlock();
1283         }
1284         return dp ? dp : ERR_PTR(-ENODEV);
1285 }
1286
1287 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1288 {
1289         struct nlattr **a = info->attrs;
1290         struct vport_parms parms;
1291         struct sk_buff *reply;
1292         struct datapath *dp;
1293         struct vport *vport;
1294         struct ovs_net *ovs_net;
1295         int err, i;
1296
1297         err = -EINVAL;
1298         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1299                 goto err;
1300
1301         rtnl_lock();
1302
1303         err = -ENOMEM;
1304         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1305         if (dp == NULL)
1306                 goto err_unlock_rtnl;
1307
1308         ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1309
1310         /* Allocate table. */
1311         err = -ENOMEM;
1312         rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1313         if (!dp->table)
1314                 goto err_free_dp;
1315
1316         dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1317         if (!dp->stats_percpu) {
1318                 err = -ENOMEM;
1319                 goto err_destroy_table;
1320         }
1321
1322         dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1323                         GFP_KERNEL);
1324         if (!dp->ports) {
1325                 err = -ENOMEM;
1326                 goto err_destroy_percpu;
1327         }
1328
1329         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1330                 INIT_HLIST_HEAD(&dp->ports[i]);
1331
1332         /* Set up our datapath device. */
1333         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1334         parms.type = OVS_VPORT_TYPE_INTERNAL;
1335         parms.options = NULL;
1336         parms.dp = dp;
1337         parms.port_no = OVSP_LOCAL;
1338         parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1339
1340         vport = new_vport(&parms);
1341         if (IS_ERR(vport)) {
1342                 err = PTR_ERR(vport);
1343                 if (err == -EBUSY)
1344                         err = -EEXIST;
1345
1346                 goto err_destroy_ports_array;
1347         }
1348
1349         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1350                                       info->snd_seq, OVS_DP_CMD_NEW);
1351         err = PTR_ERR(reply);
1352         if (IS_ERR(reply))
1353                 goto err_destroy_local_port;
1354
1355         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1356         list_add_tail(&dp->list_node, &ovs_net->dps);
1357         rtnl_unlock();
1358
1359         genl_notify(reply, genl_info_net(info), info->snd_portid,
1360                     ovs_dp_datapath_multicast_group.id, info->nlhdr,
1361                     GFP_KERNEL);
1362         return 0;
1363
1364 err_destroy_local_port:
1365         ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
1366 err_destroy_ports_array:
1367         kfree(dp->ports);
1368 err_destroy_percpu:
1369         free_percpu(dp->stats_percpu);
1370 err_destroy_table:
1371         ovs_flow_tbl_destroy(genl_dereference(dp->table));
1372 err_free_dp:
1373         release_net(ovs_dp_get_net(dp));
1374         kfree(dp);
1375 err_unlock_rtnl:
1376         rtnl_unlock();
1377 err:
1378         return err;
1379 }
1380
1381 /* Called with genl_mutex. */
1382 static void __dp_destroy(struct datapath *dp)
1383 {
1384         int i;
1385
1386         rtnl_lock();
1387
1388         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1389                 struct vport *vport;
1390                 struct hlist_node *n;
1391
1392                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1393                         if (vport->port_no != OVSP_LOCAL)
1394                                 ovs_dp_detach_port(vport);
1395         }
1396
1397         list_del(&dp->list_node);
1398         ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
1399
1400         /* rtnl_unlock() will wait until all the references to devices that
1401          * are pending unregistration have been dropped.  We do it here to
1402          * ensure that any internal devices (which contain DP pointers) are
1403          * fully destroyed before freeing the datapath.
1404          */
1405         rtnl_unlock();
1406
1407         call_rcu(&dp->rcu, destroy_dp_rcu);
1408 }
1409
1410 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1411 {
1412         struct sk_buff *reply;
1413         struct datapath *dp;
1414         int err;
1415
1416         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1417         err = PTR_ERR(dp);
1418         if (IS_ERR(dp))
1419                 return err;
1420
1421         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1422                                       info->snd_seq, OVS_DP_CMD_DEL);
1423         err = PTR_ERR(reply);
1424         if (IS_ERR(reply))
1425                 return err;
1426
1427         __dp_destroy(dp);
1428
1429         genl_notify(reply, genl_info_net(info), info->snd_portid,
1430                     ovs_dp_datapath_multicast_group.id, info->nlhdr,
1431                     GFP_KERNEL);
1432
1433         return 0;
1434 }
1435
1436 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1437 {
1438         struct sk_buff *reply;
1439         struct datapath *dp;
1440         int err;
1441
1442         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1443         if (IS_ERR(dp))
1444                 return PTR_ERR(dp);
1445
1446         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1447                                       info->snd_seq, OVS_DP_CMD_NEW);
1448         if (IS_ERR(reply)) {
1449                 err = PTR_ERR(reply);
1450                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1451                                 ovs_dp_datapath_multicast_group.id, err);
1452                 return 0;
1453         }
1454
1455         genl_notify(reply, genl_info_net(info), info->snd_portid,
1456                     ovs_dp_datapath_multicast_group.id, info->nlhdr,
1457                     GFP_KERNEL);
1458
1459         return 0;
1460 }
1461
1462 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1463 {
1464         struct sk_buff *reply;
1465         struct datapath *dp;
1466
1467         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1468         if (IS_ERR(dp))
1469                 return PTR_ERR(dp);
1470
1471         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1472                                       info->snd_seq, OVS_DP_CMD_NEW);
1473         if (IS_ERR(reply))
1474                 return PTR_ERR(reply);
1475
1476         return genlmsg_reply(reply, info);
1477 }
1478
1479 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1480 {
1481         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1482         struct datapath *dp;
1483         int skip = cb->args[0];
1484         int i = 0;
1485
1486         list_for_each_entry(dp, &ovs_net->dps, list_node) {
1487                 if (i >= skip &&
1488                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1489                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1490                                          OVS_DP_CMD_NEW) < 0)
1491                         break;
1492                 i++;
1493         }
1494
1495         cb->args[0] = i;
1496
1497         return skb->len;
1498 }
1499
1500 static struct genl_ops dp_datapath_genl_ops[] = {
1501         { .cmd = OVS_DP_CMD_NEW,
1502           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1503           .policy = datapath_policy,
1504           .doit = ovs_dp_cmd_new
1505         },
1506         { .cmd = OVS_DP_CMD_DEL,
1507           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1508           .policy = datapath_policy,
1509           .doit = ovs_dp_cmd_del
1510         },
1511         { .cmd = OVS_DP_CMD_GET,
1512           .flags = 0,               /* OK for unprivileged users. */
1513           .policy = datapath_policy,
1514           .doit = ovs_dp_cmd_get,
1515           .dumpit = ovs_dp_cmd_dump
1516         },
1517         { .cmd = OVS_DP_CMD_SET,
1518           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1519           .policy = datapath_policy,
1520           .doit = ovs_dp_cmd_set,
1521         },
1522 };
1523
1524 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1525         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1526         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1527         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1528         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1529         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1530         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1531 };
1532
1533 static struct genl_family dp_vport_genl_family = {
1534         .id = GENL_ID_GENERATE,
1535         .hdrsize = sizeof(struct ovs_header),
1536         .name = OVS_VPORT_FAMILY,
1537         .version = OVS_VPORT_VERSION,
1538         .maxattr = OVS_VPORT_ATTR_MAX,
1539         .netnsok = true
1540 };
1541
1542 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1543         .name = OVS_VPORT_MCGROUP
1544 };
1545
1546 /* Called with RTNL lock or RCU read lock. */
1547 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1548                                    u32 portid, u32 seq, u32 flags, u8 cmd)
1549 {
1550         struct ovs_header *ovs_header;
1551         struct ovs_vport_stats vport_stats;
1552         int err;
1553
1554         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1555                                  flags, cmd);
1556         if (!ovs_header)
1557                 return -EMSGSIZE;
1558
1559         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1560
1561         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1562             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1563             nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1564             nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
1565                 goto nla_put_failure;
1566
1567         ovs_vport_get_stats(vport, &vport_stats);
1568         if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1569                     &vport_stats))
1570                 goto nla_put_failure;
1571
1572         err = ovs_vport_get_options(vport, skb);
1573         if (err == -EMSGSIZE)
1574                 goto error;
1575
1576         return genlmsg_end(skb, ovs_header);
1577
1578 nla_put_failure:
1579         err = -EMSGSIZE;
1580 error:
1581         genlmsg_cancel(skb, ovs_header);
1582         return err;
1583 }
1584
1585 /* Called with RTNL lock or RCU read lock. */
1586 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1587                                          u32 seq, u8 cmd)
1588 {
1589         struct sk_buff *skb;
1590         int retval;
1591
1592         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1593         if (!skb)
1594                 return ERR_PTR(-ENOMEM);
1595
1596         retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1597         if (retval < 0) {
1598                 kfree_skb(skb);
1599                 return ERR_PTR(retval);
1600         }
1601         return skb;
1602 }
1603
1604 /* Called with RTNL lock or RCU read lock. */
1605 static struct vport *lookup_vport(struct net *net,
1606                                   struct ovs_header *ovs_header,
1607                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1608 {
1609         struct datapath *dp;
1610         struct vport *vport;
1611
1612         if (a[OVS_VPORT_ATTR_NAME]) {
1613                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1614                 if (!vport)
1615                         return ERR_PTR(-ENODEV);
1616                 if (ovs_header->dp_ifindex &&
1617                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1618                         return ERR_PTR(-ENODEV);
1619                 return vport;
1620         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1621                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1622
1623                 if (port_no >= DP_MAX_PORTS)
1624                         return ERR_PTR(-EFBIG);
1625
1626                 dp = get_dp(net, ovs_header->dp_ifindex);
1627                 if (!dp)
1628                         return ERR_PTR(-ENODEV);
1629
1630                 vport = ovs_vport_rtnl_rcu(dp, port_no);
1631                 if (!vport)
1632                         return ERR_PTR(-ENODEV);
1633                 return vport;
1634         } else
1635                 return ERR_PTR(-EINVAL);
1636 }
1637
1638 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1639 {
1640         struct nlattr **a = info->attrs;
1641         struct ovs_header *ovs_header = info->userhdr;
1642         struct vport_parms parms;
1643         struct sk_buff *reply;
1644         struct vport *vport;
1645         struct datapath *dp;
1646         u32 port_no;
1647         int err;
1648
1649         err = -EINVAL;
1650         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1651             !a[OVS_VPORT_ATTR_UPCALL_PID])
1652                 goto exit;
1653
1654         rtnl_lock();
1655         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1656         err = -ENODEV;
1657         if (!dp)
1658                 goto exit_unlock;
1659
1660         if (a[OVS_VPORT_ATTR_PORT_NO]) {
1661                 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1662
1663                 err = -EFBIG;
1664                 if (port_no >= DP_MAX_PORTS)
1665                         goto exit_unlock;
1666
1667                 vport = ovs_vport_rtnl_rcu(dp, port_no);
1668                 err = -EBUSY;
1669                 if (vport)
1670                         goto exit_unlock;
1671         } else {
1672                 for (port_no = 1; ; port_no++) {
1673                         if (port_no >= DP_MAX_PORTS) {
1674                                 err = -EFBIG;
1675                                 goto exit_unlock;
1676                         }
1677                         vport = ovs_vport_rtnl(dp, port_no);
1678                         if (!vport)
1679                                 break;
1680                 }
1681         }
1682
1683         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1684         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1685         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1686         parms.dp = dp;
1687         parms.port_no = port_no;
1688         parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1689
1690         vport = new_vport(&parms);
1691         err = PTR_ERR(vport);
1692         if (IS_ERR(vport))
1693                 goto exit_unlock;
1694
1695         err = 0;
1696         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1697                                          OVS_VPORT_CMD_NEW);
1698         if (IS_ERR(reply)) {
1699                 err = PTR_ERR(reply);
1700                 ovs_dp_detach_port(vport);
1701                 goto exit_unlock;
1702         }
1703         genl_notify(reply, genl_info_net(info), info->snd_portid,
1704                     ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1705
1706 exit_unlock:
1707         rtnl_unlock();
1708 exit:
1709         return err;
1710 }
1711
1712 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1713 {
1714         struct nlattr **a = info->attrs;
1715         struct sk_buff *reply;
1716         struct vport *vport;
1717         int err;
1718
1719         rtnl_lock();
1720         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1721         err = PTR_ERR(vport);
1722         if (IS_ERR(vport))
1723                 goto exit_unlock;
1724
1725         err = 0;
1726         if (a[OVS_VPORT_ATTR_TYPE] &&
1727             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type)
1728                 err = -EINVAL;
1729
1730         if (!err && a[OVS_VPORT_ATTR_OPTIONS])
1731                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1732         if (err)
1733                 goto exit_unlock;
1734         if (a[OVS_VPORT_ATTR_UPCALL_PID])
1735                 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1736
1737         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1738                                          OVS_VPORT_CMD_NEW);
1739         if (IS_ERR(reply)) {
1740                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1741                                 ovs_dp_vport_multicast_group.id, PTR_ERR(reply));
1742                 goto exit_unlock;
1743         }
1744
1745         genl_notify(reply, genl_info_net(info), info->snd_portid,
1746                     ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1747
1748 exit_unlock:
1749         rtnl_unlock();
1750         return err;
1751 }
1752
1753 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1754 {
1755         struct nlattr **a = info->attrs;
1756         struct sk_buff *reply;
1757         struct vport *vport;
1758         int err;
1759
1760         rtnl_lock();
1761         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1762         err = PTR_ERR(vport);
1763         if (IS_ERR(vport))
1764                 goto exit_unlock;
1765
1766         if (vport->port_no == OVSP_LOCAL) {
1767                 err = -EINVAL;
1768                 goto exit_unlock;
1769         }
1770
1771         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1772                                          OVS_VPORT_CMD_DEL);
1773         err = PTR_ERR(reply);
1774         if (IS_ERR(reply))
1775                 goto exit_unlock;
1776
1777         err = 0;
1778         ovs_dp_detach_port(vport);
1779
1780         genl_notify(reply, genl_info_net(info), info->snd_portid,
1781                     ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1782
1783 exit_unlock:
1784         rtnl_unlock();
1785         return err;
1786 }
1787
1788 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1789 {
1790         struct nlattr **a = info->attrs;
1791         struct ovs_header *ovs_header = info->userhdr;
1792         struct sk_buff *reply;
1793         struct vport *vport;
1794         int err;
1795
1796         rcu_read_lock();
1797         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1798         err = PTR_ERR(vport);
1799         if (IS_ERR(vport))
1800                 goto exit_unlock;
1801
1802         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1803                                          OVS_VPORT_CMD_NEW);
1804         err = PTR_ERR(reply);
1805         if (IS_ERR(reply))
1806                 goto exit_unlock;
1807
1808         rcu_read_unlock();
1809
1810         return genlmsg_reply(reply, info);
1811
1812 exit_unlock:
1813         rcu_read_unlock();
1814         return err;
1815 }
1816
1817 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1818 {
1819         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1820         struct datapath *dp;
1821         int bucket = cb->args[0], skip = cb->args[1];
1822         int i, j = 0;
1823
1824         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1825         if (!dp)
1826                 return -ENODEV;
1827
1828         rcu_read_lock();
1829         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1830                 struct vport *vport;
1831
1832                 j = 0;
1833                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1834                         if (j >= skip &&
1835                             ovs_vport_cmd_fill_info(vport, skb,
1836                                                     NETLINK_CB(cb->skb).portid,
1837                                                     cb->nlh->nlmsg_seq,
1838                                                     NLM_F_MULTI,
1839                                                     OVS_VPORT_CMD_NEW) < 0)
1840                                 goto out;
1841
1842                         j++;
1843                 }
1844                 skip = 0;
1845         }
1846 out:
1847         rcu_read_unlock();
1848
1849         cb->args[0] = i;
1850         cb->args[1] = j;
1851
1852         return skb->len;
1853 }
1854
1855 static struct genl_ops dp_vport_genl_ops[] = {
1856         { .cmd = OVS_VPORT_CMD_NEW,
1857           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1858           .policy = vport_policy,
1859           .doit = ovs_vport_cmd_new
1860         },
1861         { .cmd = OVS_VPORT_CMD_DEL,
1862           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1863           .policy = vport_policy,
1864           .doit = ovs_vport_cmd_del
1865         },
1866         { .cmd = OVS_VPORT_CMD_GET,
1867           .flags = 0,               /* OK for unprivileged users. */
1868           .policy = vport_policy,
1869           .doit = ovs_vport_cmd_get,
1870           .dumpit = ovs_vport_cmd_dump
1871         },
1872         { .cmd = OVS_VPORT_CMD_SET,
1873           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1874           .policy = vport_policy,
1875           .doit = ovs_vport_cmd_set,
1876         },
1877 };
1878
1879 struct genl_family_and_ops {
1880         struct genl_family *family;
1881         struct genl_ops *ops;
1882         int n_ops;
1883         struct genl_multicast_group *group;
1884 };
1885
1886 static const struct genl_family_and_ops dp_genl_families[] = {
1887         { &dp_datapath_genl_family,
1888           dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1889           &ovs_dp_datapath_multicast_group },
1890         { &dp_vport_genl_family,
1891           dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1892           &ovs_dp_vport_multicast_group },
1893         { &dp_flow_genl_family,
1894           dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1895           &ovs_dp_flow_multicast_group },
1896         { &dp_packet_genl_family,
1897           dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1898           NULL },
1899 };
1900
1901 static void dp_unregister_genl(int n_families)
1902 {
1903         int i;
1904
1905         for (i = 0; i < n_families; i++)
1906                 genl_unregister_family(dp_genl_families[i].family);
1907 }
1908
1909 static int dp_register_genl(void)
1910 {
1911         int n_registered;
1912         int err;
1913         int i;
1914
1915         n_registered = 0;
1916         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1917                 const struct genl_family_and_ops *f = &dp_genl_families[i];
1918
1919                 err = genl_register_family_with_ops(f->family, f->ops,
1920                                                     f->n_ops);
1921                 if (err)
1922                         goto error;
1923                 n_registered++;
1924
1925                 if (f->group) {
1926                         err = genl_register_mc_group(f->family, f->group);
1927                         if (err)
1928                                 goto error;
1929                 }
1930         }
1931
1932         return 0;
1933
1934 error:
1935         dp_unregister_genl(n_registered);
1936         return err;
1937 }
1938
1939 static void rehash_flow_table(struct work_struct *work)
1940 {
1941         struct datapath *dp;
1942         struct net *net;
1943
1944         genl_lock();
1945         rtnl_lock();
1946         for_each_net(net) {
1947                 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1948
1949                 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1950                         struct flow_table *old_table = genl_dereference(dp->table);
1951                         struct flow_table *new_table;
1952
1953                         new_table = ovs_flow_tbl_rehash(old_table);
1954                         if (!IS_ERR(new_table)) {
1955                                 rcu_assign_pointer(dp->table, new_table);
1956                                 ovs_flow_tbl_deferred_destroy(old_table);
1957                         }
1958                 }
1959         }
1960         rtnl_unlock();
1961         genl_unlock();
1962
1963         schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1964 }
1965
1966 static int __net_init ovs_init_net(struct net *net)
1967 {
1968         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1969
1970         INIT_LIST_HEAD(&ovs_net->dps);
1971         return 0;
1972 }
1973
1974 static void __net_exit ovs_exit_net(struct net *net)
1975 {
1976         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1977         struct datapath *dp, *dp_next;
1978
1979         genl_lock();
1980         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
1981                 __dp_destroy(dp);
1982         genl_unlock();
1983 }
1984
1985 static struct pernet_operations ovs_net_ops = {
1986         .init = ovs_init_net,
1987         .exit = ovs_exit_net,
1988         .id   = &ovs_net_id,
1989         .size = sizeof(struct ovs_net),
1990 };
1991
1992 static int __init dp_init(void)
1993 {
1994         int err;
1995
1996         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
1997
1998         pr_info("Open vSwitch switching datapath\n");
1999
2000         err = ovs_flow_init();
2001         if (err)
2002                 goto error;
2003
2004         err = ovs_vport_init();
2005         if (err)
2006                 goto error_flow_exit;
2007
2008         err = register_pernet_device(&ovs_net_ops);
2009         if (err)
2010                 goto error_vport_exit;
2011
2012         err = register_netdevice_notifier(&ovs_dp_device_notifier);
2013         if (err)
2014                 goto error_netns_exit;
2015
2016         err = dp_register_genl();
2017         if (err < 0)
2018                 goto error_unreg_notifier;
2019
2020         schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2021
2022         return 0;
2023
2024 error_unreg_notifier:
2025         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2026 error_netns_exit:
2027         unregister_pernet_device(&ovs_net_ops);
2028 error_vport_exit:
2029         ovs_vport_exit();
2030 error_flow_exit:
2031         ovs_flow_exit();
2032 error:
2033         return err;
2034 }
2035
2036 static void dp_cleanup(void)
2037 {
2038         cancel_delayed_work_sync(&rehash_flow_wq);
2039         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2040         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2041         unregister_pernet_device(&ovs_net_ops);
2042         rcu_barrier();
2043         ovs_vport_exit();
2044         ovs_flow_exit();
2045 }
2046
2047 module_init(dp_init);
2048 module_exit(dp_cleanup);
2049
2050 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2051 MODULE_LICENSE("GPL");