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 = this_cpu_ptr(dp->stats_percpu);
 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 = this_cpu_ptr(dp->stats_percpu);
 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         const struct ovs_key_ipv6 *ipv6_key;
 483
 484         case OVS_KEY_ATTR_PRIORITY:
 485         case OVS_KEY_ATTR_SKB_MARK:
 486         case OVS_KEY_ATTR_ETHERNET:
 487                 break;
 488
 489         case OVS_KEY_ATTR_IPV4:
 490                 if (flow_key->eth.type != htons(ETH_P_IP))
 491                         return -EINVAL;
 492
 493                 if (!flow_key->ip.proto)
 494                         return -EINVAL;
 495
 496                 ipv4_key = nla_data(ovs_key);
 497                 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
 498                         return -EINVAL;
 499
 500                 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
 501                         return -EINVAL;
 502
 503                 break;
 504
 505         case OVS_KEY_ATTR_IPV6:
 506                 if (flow_key->eth.type != htons(ETH_P_IPV6))
 507                         return -EINVAL;
 508
 509                 if (!flow_key->ip.proto)
 510                         return -EINVAL;
 511
 512                 ipv6_key = nla_data(ovs_key);
 513                 if (ipv6_key->ipv6_proto != flow_key->ip.proto)
 514                         return -EINVAL;
 515
 516                 if (ipv6_key->ipv6_frag != flow_key->ip.frag)
 517                         return -EINVAL;
 518
 519                 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
 520                         return -EINVAL;
 521
 522                 break;
 523
 524         case OVS_KEY_ATTR_TCP:
 525                 if (flow_key->ip.proto != IPPROTO_TCP)
 526                         return -EINVAL;
 527
 528                 return validate_tp_port(flow_key);
 529
 530         case OVS_KEY_ATTR_UDP:
 531                 if (flow_key->ip.proto != IPPROTO_UDP)
 532                         return -EINVAL;
 533
 534                 return validate_tp_port(flow_key);
 535
 536         default:
 537                 return -EINVAL;
 538         }
 539
 540         return 0;
 541 }
 542
 543 static int validate_userspace(const struct nlattr *attr)
 544 {
 545         static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] =   {
 546                 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
 547                 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 },
 548         };
 549         struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
 550         int error;
 551
 552         error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
 553                                  attr, userspace_policy);
 554         if (error)
 555                 return error;
 556
 557         if (!a[OVS_USERSPACE_ATTR_PID] ||
 558             !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
 559                 return -EINVAL;
 560
 561         return 0;
 562 }
 563
 564 static int validate_actions(const struct nlattr *attr,
 565                                 const struct sw_flow_key *key,  int depth)
 566 {
 567         const struct nlattr *a;
 568         int rem, err;
 569
 570         if (depth >= SAMPLE_ACTION_DEPTH)
 571                 return -EOVERFLOW;
 572
 573         nla_for_each_nested(a, attr, rem) {
 574                 /* Expected argument lengths, (u32)-1 for variable length. */
 575                 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
 576                         [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
 577                         [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
 578                         [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
 579                         [OVS_ACTION_ATTR_POP_VLAN] = 0,
 580                         [OVS_ACTION_ATTR_SET] = (u32)-1,
 581                         [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
 582                 };
 583                 const struct ovs_action_push_vlan *vlan;
 584                 int type = nla_type(a);
 585
 586                 if (type > OVS_ACTION_ATTR_MAX ||
 587                     (action_lens[type] != nla_len(a) &&
 588                      action_lens[type] != (u32)-1))
 589                         return -EINVAL;
 590
 591                 switch (type) {
 592                 case OVS_ACTION_ATTR_UNSPEC:
 593                         return -EINVAL;
 594
 595                 case OVS_ACTION_ATTR_USERSPACE:
 596                         err = validate_userspace(a);
 597                         if (err)
 598                                 return err;
 599                         break;
 600
 601                 case OVS_ACTION_ATTR_OUTPUT:
 602                         if (nla_get_u32(a) >= DP_MAX_PORTS)
 603                                 return -EINVAL;
 604                         break;
 605
 606
 607                 case OVS_ACTION_ATTR_POP_VLAN:
 608                         break;
 609
 610                 case OVS_ACTION_ATTR_PUSH_VLAN:
 611                         vlan = nla_data(a);
 612                         if (vlan->vlan_tpid != htons(ETH_P_8021Q))
 613                                 return -EINVAL;
 614                         if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
 615                                 return -EINVAL;
 616                         break;
 617
 618                 case OVS_ACTION_ATTR_SET:
 619                         err = validate_set(a, key);
 620                         if (err)
 621                                 return err;
 622                         break;
 623
 624                 case OVS_ACTION_ATTR_SAMPLE:
 625                         err = validate_sample(a, key, depth);
 626                         if (err)
 627                                 return err;
 628                         break;
 629
 630                 default:
 631                         return -EINVAL;
 632                 }
 633         }
 634
 635         if (rem > 0)
 636                 return -EINVAL;
 637
 638         return 0;
 639 }
 640
 641 static void clear_stats(struct sw_flow *flow)
 642 {
 643         flow->used = 0;
 644         flow->tcp_flags = 0;
 645         flow->packet_count = 0;
 646         flow->byte_count = 0;
 647 }
 648
 649 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 650 {
 651         struct ovs_header *ovs_header = info->userhdr;
 652         struct nlattr **a = info->attrs;
 653         struct sw_flow_actions *acts;
 654         struct sk_buff *packet;
 655         struct sw_flow *flow;
 656         struct datapath *dp;
 657         struct ethhdr *eth;
 658         int len;
 659         int err;
 660         int key_len;
 661
 662         err = -EINVAL;
 663         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 664             !a[OVS_PACKET_ATTR_ACTIONS] ||
 665             nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN)
 666                 goto err;
 667
 668         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 669         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 670         err = -ENOMEM;
 671         if (!packet)
 672                 goto err;
 673         skb_reserve(packet, NET_IP_ALIGN);
 674
 675         memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len);
 676
 677         skb_reset_mac_header(packet);
 678         eth = eth_hdr(packet);
 679
 680         /* Normally, setting the skb 'protocol' field would be handled by a
 681          * call to eth_type_trans(), but it assumes there's a sending
 682          * device, which we may not have. */
 683         if (ntohs(eth->h_proto) >= 1536)
 684                 packet->protocol = eth->h_proto;
 685         else
 686                 packet->protocol = htons(ETH_P_802_2);
 687
 688         /* Build an sw_flow for sending this packet. */
 689         flow = ovs_flow_alloc();
 690         err = PTR_ERR(flow);
 691         if (IS_ERR(flow))
 692                 goto err_kfree_skb;
 693
 694         err = ovs_flow_extract(packet, -1, &flow->key, &key_len);
 695         if (err)
 696                 goto err_flow_free;
 697
 698         err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority,
 699                                              &flow->key.phy.skb_mark,
 700                                              &flow->key.phy.in_port,
 701                                              a[OVS_PACKET_ATTR_KEY]);
 702         if (err)
 703                 goto err_flow_free;
 704
 705         err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0);
 706         if (err)
 707                 goto err_flow_free;
 708
 709         flow->hash = ovs_flow_hash(&flow->key, key_len);
 710
 711         acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]);
 712         err = PTR_ERR(acts);
 713         if (IS_ERR(acts))
 714                 goto err_flow_free;
 715         rcu_assign_pointer(flow->sf_acts, acts);
 716
 717         OVS_CB(packet)->flow = flow;
 718         packet->priority = flow->key.phy.priority;
 719         packet->mark = flow->key.phy.skb_mark;
 720
 721         rcu_read_lock();
 722         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 723         err = -ENODEV;
 724         if (!dp)
 725                 goto err_unlock;
 726
 727         local_bh_disable();
 728         err = ovs_execute_actions(dp, packet);
 729         local_bh_enable();
 730         rcu_read_unlock();
 731
 732         ovs_flow_free(flow);
 733         return err;
 734
 735 err_unlock:
 736         rcu_read_unlock();
 737 err_flow_free:
 738         ovs_flow_free(flow);
 739 err_kfree_skb:
 740         kfree_skb(packet);
 741 err:
 742         return err;
 743 }
 744
 745 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 746         [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
 747         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 748         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 749 };
 750
 751 static struct genl_ops dp_packet_genl_ops[] = {
 752         { .cmd = OVS_PACKET_CMD_EXECUTE,
 753           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 754           .policy = packet_policy,
 755           .doit = ovs_packet_cmd_execute
 756         }
 757 };
 758
 759 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
 760 {
 761         int i;
 762         struct flow_table *table = genl_dereference(dp->table);
 763
 764         stats->n_flows = ovs_flow_tbl_count(table);
 765
 766         stats->n_hit = stats->n_missed = stats->n_lost = 0;
 767         for_each_possible_cpu(i) {
 768                 const struct dp_stats_percpu *percpu_stats;
 769                 struct dp_stats_percpu local_stats;
 770                 unsigned int start;
 771
 772                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 773
 774                 do {
 775                         start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
 776                         local_stats = *percpu_stats;
 777                 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
 778
 779                 stats->n_hit += local_stats.n_hit;
 780                 stats->n_missed += local_stats.n_missed;
 781                 stats->n_lost += local_stats.n_lost;
 782         }
 783 }
 784
 785 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
 786         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
 787         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
 788         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
 789 };
 790
 791 static struct genl_family dp_flow_genl_family = {
 792         .id = GENL_ID_GENERATE,
 793         .hdrsize = sizeof(struct ovs_header),
 794         .name = OVS_FLOW_FAMILY,
 795         .version = OVS_FLOW_VERSION,
 796         .maxattr = OVS_FLOW_ATTR_MAX,
 797         .netnsok = true
 798 };
 799
 800 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
 801         .name = OVS_FLOW_MCGROUP
 802 };
 803
 804 /* Called with genl_lock. */
 805 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
 806                                   struct sk_buff *skb, u32 portid,
 807                                   u32 seq, u32 flags, u8 cmd)
 808 {
 809         const int skb_orig_len = skb->len;
 810         const struct sw_flow_actions *sf_acts;
 811         struct ovs_flow_stats stats;
 812         struct ovs_header *ovs_header;
 813         struct nlattr *nla;
 814         unsigned long used;
 815         u8 tcp_flags;
 816         int err;
 817
 818         sf_acts = rcu_dereference_protected(flow->sf_acts,
 819                                             lockdep_genl_is_held());
 820
 821         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
 822         if (!ovs_header)
 823                 return -EMSGSIZE;
 824
 825         ovs_header->dp_ifindex = get_dpifindex(dp);
 826
 827         nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
 828         if (!nla)
 829                 goto nla_put_failure;
 830         err = ovs_flow_to_nlattrs(&flow->key, skb);
 831         if (err)
 832                 goto error;
 833         nla_nest_end(skb, nla);
 834
 835         spin_lock_bh(&flow->lock);
 836         used = flow->used;
 837         stats.n_packets = flow->packet_count;
 838         stats.n_bytes = flow->byte_count;
 839         tcp_flags = flow->tcp_flags;
 840         spin_unlock_bh(&flow->lock);
 841
 842         if (used &&
 843             nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
 844                 goto nla_put_failure;
 845
 846         if (stats.n_packets &&
 847             nla_put(skb, OVS_FLOW_ATTR_STATS,
 848                     sizeof(struct ovs_flow_stats), &stats))
 849                 goto nla_put_failure;
 850
 851         if (tcp_flags &&
 852             nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
 853                 goto nla_put_failure;
 854
 855         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 856          * this is the first flow to be dumped into 'skb'.  This is unusual for
 857          * Netlink but individual action lists can be longer than
 858          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 859          * The userspace caller can always fetch the actions separately if it
 860          * really wants them.  (Most userspace callers in fact don't care.)
 861          *
 862          * This can only fail for dump operations because the skb is always
 863          * properly sized for single flows.
 864          */
 865         err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
 866                       sf_acts->actions);
 867         if (err < 0 && skb_orig_len)
 868                 goto error;
 869
 870         return genlmsg_end(skb, ovs_header);
 871
 872 nla_put_failure:
 873         err = -EMSGSIZE;
 874 error:
 875         genlmsg_cancel(skb, ovs_header);
 876         return err;
 877 }
 878
 879 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
 880 {
 881         const struct sw_flow_actions *sf_acts;
 882         int len;
 883
 884         sf_acts = rcu_dereference_protected(flow->sf_acts,
 885                                             lockdep_genl_is_held());
 886
 887         /* OVS_FLOW_ATTR_KEY */
 888         len = nla_total_size(FLOW_BUFSIZE);
 889         /* OVS_FLOW_ATTR_ACTIONS */
 890         len += nla_total_size(sf_acts->actions_len);
 891         /* OVS_FLOW_ATTR_STATS */
 892         len += nla_total_size(sizeof(struct ovs_flow_stats));
 893         /* OVS_FLOW_ATTR_TCP_FLAGS */
 894         len += nla_total_size(1);
 895         /* OVS_FLOW_ATTR_USED */
 896         len += nla_total_size(8);
 897
 898         len += NLMSG_ALIGN(sizeof(struct ovs_header));
 899
 900         return genlmsg_new(len, GFP_KERNEL);
 901 }
 902
 903 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
 904                                                struct datapath *dp,
 905                                                u32 portid, u32 seq, u8 cmd)
 906 {
 907         struct sk_buff *skb;
 908         int retval;
 909
 910         skb = ovs_flow_cmd_alloc_info(flow);
 911         if (!skb)
 912                 return ERR_PTR(-ENOMEM);
 913
 914         retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
 915         BUG_ON(retval < 0);
 916         return skb;
 917 }
 918
 919 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
 920 {
 921         struct nlattr **a = info->attrs;
 922         struct ovs_header *ovs_header = info->userhdr;
 923         struct sw_flow_key key;
 924         struct sw_flow *flow;
 925         struct sk_buff *reply;
 926         struct datapath *dp;
 927         struct flow_table *table;
 928         int error;
 929         int key_len;
 930
 931         /* Extract key. */
 932         error = -EINVAL;
 933         if (!a[OVS_FLOW_ATTR_KEY])
 934                 goto error;
 935         error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
 936         if (error)
 937                 goto error;
 938
 939         /* Validate actions. */
 940         if (a[OVS_FLOW_ATTR_ACTIONS]) {
 941                 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key,  0);
 942                 if (error)
 943                         goto error;
 944         } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
 945                 error = -EINVAL;
 946                 goto error;
 947         }
 948
 949         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 950         error = -ENODEV;
 951         if (!dp)
 952                 goto error;
 953
 954         table = genl_dereference(dp->table);
 955         flow = ovs_flow_tbl_lookup(table, &key, key_len);
 956         if (!flow) {
 957                 struct sw_flow_actions *acts;
 958
 959                 /* Bail out if we're not allowed to create a new flow. */
 960                 error = -ENOENT;
 961                 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
 962                         goto error;
 963
 964                 /* Expand table, if necessary, to make room. */
 965                 if (ovs_flow_tbl_need_to_expand(table)) {
 966                         struct flow_table *new_table;
 967
 968                         new_table = ovs_flow_tbl_expand(table);
 969                         if (!IS_ERR(new_table)) {
 970                                 rcu_assign_pointer(dp->table, new_table);
 971                                 ovs_flow_tbl_deferred_destroy(table);
 972                                 table = genl_dereference(dp->table);
 973                         }
 974                 }
 975
 976                 /* Allocate flow. */
 977                 flow = ovs_flow_alloc();
 978                 if (IS_ERR(flow)) {
 979                         error = PTR_ERR(flow);
 980                         goto error;
 981                 }
 982                 flow->key = key;
 983                 clear_stats(flow);
 984
 985                 /* Obtain actions. */
 986                 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
 987                 error = PTR_ERR(acts);
 988                 if (IS_ERR(acts))
 989                         goto error_free_flow;
 990                 rcu_assign_pointer(flow->sf_acts, acts);
 991
 992                 /* Put flow in bucket. */
 993                 flow->hash = ovs_flow_hash(&key, key_len);
 994                 ovs_flow_tbl_insert(table, flow);
 995
 996                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
 997                                                 info->snd_seq,
 998                                                 OVS_FLOW_CMD_NEW);
 999         } else {
1000                 /* We found a matching flow. */
1001                 struct sw_flow_actions *old_acts;
1002                 struct nlattr *acts_attrs;
1003
1004                 /* Bail out if we're not allowed to modify an existing flow.
1005                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1006                  * because Generic Netlink treats the latter as a dump
1007                  * request.  We also accept NLM_F_EXCL in case that bug ever
1008                  * gets fixed.
1009                  */
1010                 error = -EEXIST;
1011                 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
1012                     info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
1013                         goto error;
1014
1015                 /* Update actions. */
1016                 old_acts = rcu_dereference_protected(flow->sf_acts,
1017                                                      lockdep_genl_is_held());
1018                 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS];
1019                 if (acts_attrs &&
1020                    (old_acts->actions_len != nla_len(acts_attrs) ||
1021                    memcmp(old_acts->actions, nla_data(acts_attrs),
1022                           old_acts->actions_len))) {
1023                         struct sw_flow_actions *new_acts;
1024
1025                         new_acts = ovs_flow_actions_alloc(acts_attrs);
1026                         error = PTR_ERR(new_acts);
1027                         if (IS_ERR(new_acts))
1028                                 goto error;
1029
1030                         rcu_assign_pointer(flow->sf_acts, new_acts);
1031                         ovs_flow_deferred_free_acts(old_acts);
1032                 }
1033
1034                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1035                                                info->snd_seq, OVS_FLOW_CMD_NEW);
1036
1037                 /* Clear stats. */
1038                 if (a[OVS_FLOW_ATTR_CLEAR]) {
1039                         spin_lock_bh(&flow->lock);
1040                         clear_stats(flow);
1041                         spin_unlock_bh(&flow->lock);
1042                 }
1043         }
1044
1045         if (!IS_ERR(reply))
1046                 genl_notify(reply, genl_info_net(info), info->snd_portid,
1047                            ovs_dp_flow_multicast_group.id, info->nlhdr,
1048                            GFP_KERNEL);
1049         else
1050                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1051                                 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
1052         return 0;
1053
1054 error_free_flow:
1055         ovs_flow_free(flow);
1056 error:
1057         return error;
1058 }
1059
1060 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1061 {
1062         struct nlattr **a = info->attrs;
1063         struct ovs_header *ovs_header = info->userhdr;
1064         struct sw_flow_key key;
1065         struct sk_buff *reply;
1066         struct sw_flow *flow;
1067         struct datapath *dp;
1068         struct flow_table *table;
1069         int err;
1070         int key_len;
1071
1072         if (!a[OVS_FLOW_ATTR_KEY])
1073                 return -EINVAL;
1074         err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1075         if (err)
1076                 return err;
1077
1078         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1079         if (!dp)
1080                 return -ENODEV;
1081
1082         table = genl_dereference(dp->table);
1083         flow = ovs_flow_tbl_lookup(table, &key, key_len);
1084         if (!flow)
1085                 return -ENOENT;
1086
1087         reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1088                                         info->snd_seq, OVS_FLOW_CMD_NEW);
1089         if (IS_ERR(reply))
1090                 return PTR_ERR(reply);
1091
1092         return genlmsg_reply(reply, info);
1093 }
1094
1095 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1096 {
1097         struct nlattr **a = info->attrs;
1098         struct ovs_header *ovs_header = info->userhdr;
1099         struct sw_flow_key key;
1100         struct sk_buff *reply;
1101         struct sw_flow *flow;
1102         struct datapath *dp;
1103         struct flow_table *table;
1104         int err;
1105         int key_len;
1106
1107         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1108         if (!dp)
1109                 return -ENODEV;
1110
1111         if (!a[OVS_FLOW_ATTR_KEY])
1112                 return flush_flows(dp);
1113
1114         err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1115         if (err)
1116                 return err;
1117
1118         table = genl_dereference(dp->table);
1119         flow = ovs_flow_tbl_lookup(table, &key, key_len);
1120         if (!flow)
1121                 return -ENOENT;
1122
1123         reply = ovs_flow_cmd_alloc_info(flow);
1124         if (!reply)
1125                 return -ENOMEM;
1126
1127         ovs_flow_tbl_remove(table, flow);
1128
1129         err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
1130                                      info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1131         BUG_ON(err < 0);
1132
1133         ovs_flow_deferred_free(flow);
1134
1135         genl_notify(reply, genl_info_net(info), info->snd_portid,
1136                     ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1137         return 0;
1138 }
1139
1140 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1141 {
1142         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1143         struct datapath *dp;
1144         struct flow_table *table;
1145
1146         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1147         if (!dp)
1148                 return -ENODEV;
1149
1150         table = genl_dereference(dp->table);
1151
1152         for (;;) {
1153                 struct sw_flow *flow;
1154                 u32 bucket, obj;
1155
1156                 bucket = cb->args[0];
1157                 obj = cb->args[1];
1158                 flow = ovs_flow_tbl_next(table, &bucket, &obj);
1159                 if (!flow)
1160                         break;
1161
1162                 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1163                                            NETLINK_CB(cb->skb).portid,
1164                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1165                                            OVS_FLOW_CMD_NEW) < 0)
1166                         break;
1167
1168                 cb->args[0] = bucket;
1169                 cb->args[1] = obj;
1170         }
1171         return skb->len;
1172 }
1173
1174 static struct genl_ops dp_flow_genl_ops[] = {
1175         { .cmd = OVS_FLOW_CMD_NEW,
1176           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1177           .policy = flow_policy,
1178           .doit = ovs_flow_cmd_new_or_set
1179         },
1180         { .cmd = OVS_FLOW_CMD_DEL,
1181           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1182           .policy = flow_policy,
1183           .doit = ovs_flow_cmd_del
1184         },
1185         { .cmd = OVS_FLOW_CMD_GET,
1186           .flags = 0,               /* OK for unprivileged users. */
1187           .policy = flow_policy,
1188           .doit = ovs_flow_cmd_get,
1189           .dumpit = ovs_flow_cmd_dump
1190         },
1191         { .cmd = OVS_FLOW_CMD_SET,
1192           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1193           .policy = flow_policy,
1194           .doit = ovs_flow_cmd_new_or_set,
1195         },
1196 };
1197
1198 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1199         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1200         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1201 };
1202
1203 static struct genl_family dp_datapath_genl_family = {
1204         .id = GENL_ID_GENERATE,
1205         .hdrsize = sizeof(struct ovs_header),
1206         .name = OVS_DATAPATH_FAMILY,
1207         .version = OVS_DATAPATH_VERSION,
1208         .maxattr = OVS_DP_ATTR_MAX,
1209         .netnsok = true
1210 };
1211
1212 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1213         .name = OVS_DATAPATH_MCGROUP
1214 };
1215
1216 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1217                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1218 {
1219         struct ovs_header *ovs_header;
1220         struct ovs_dp_stats dp_stats;
1221         int err;
1222
1223         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1224                                    flags, cmd);
1225         if (!ovs_header)
1226                 goto error;
1227
1228         ovs_header->dp_ifindex = get_dpifindex(dp);
1229
1230         rcu_read_lock();
1231         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1232         rcu_read_unlock();
1233         if (err)
1234                 goto nla_put_failure;
1235
1236         get_dp_stats(dp, &dp_stats);
1237         if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
1238                 goto nla_put_failure;
1239
1240         return genlmsg_end(skb, ovs_header);
1241
1242 nla_put_failure:
1243         genlmsg_cancel(skb, ovs_header);
1244 error:
1245         return -EMSGSIZE;
1246 }
1247
1248 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
1249                                              u32 seq, u8 cmd)
1250 {
1251         struct sk_buff *skb;
1252         int retval;
1253
1254         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1255         if (!skb)
1256                 return ERR_PTR(-ENOMEM);
1257
1258         retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
1259         if (retval < 0) {
1260                 kfree_skb(skb);
1261                 return ERR_PTR(retval);
1262         }
1263         return skb;
1264 }
1265
1266 /* Called with genl_mutex and optionally with RTNL lock also. */
1267 static struct datapath *lookup_datapath(struct net *net,
1268                                         struct ovs_header *ovs_header,
1269                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1270 {
1271         struct datapath *dp;
1272
1273         if (!a[OVS_DP_ATTR_NAME])
1274                 dp = get_dp(net, ovs_header->dp_ifindex);
1275         else {
1276                 struct vport *vport;
1277
1278                 rcu_read_lock();
1279                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1280                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1281                 rcu_read_unlock();
1282         }
1283         return dp ? dp : ERR_PTR(-ENODEV);
1284 }
1285
1286 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1287 {
1288         struct nlattr **a = info->attrs;
1289         struct vport_parms parms;
1290         struct sk_buff *reply;
1291         struct datapath *dp;
1292         struct vport *vport;
1293         struct ovs_net *ovs_net;
1294         int err, i;
1295
1296         err = -EINVAL;
1297         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1298                 goto err;
1299
1300         rtnl_lock();
1301
1302         err = -ENOMEM;
1303         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1304         if (dp == NULL)
1305                 goto err_unlock_rtnl;
1306
1307         ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1308
1309         /* Allocate table. */
1310         err = -ENOMEM;
1311         rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1312         if (!dp->table)
1313                 goto err_free_dp;
1314
1315         dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1316         if (!dp->stats_percpu) {
1317                 err = -ENOMEM;
1318                 goto err_destroy_table;
1319         }
1320
1321         dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1322                         GFP_KERNEL);
1323         if (!dp->ports) {
1324                 err = -ENOMEM;
1325                 goto err_destroy_percpu;
1326         }
1327
1328         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1329                 INIT_HLIST_HEAD(&dp->ports[i]);
1330
1331         /* Set up our datapath device. */
1332         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1333         parms.type = OVS_VPORT_TYPE_INTERNAL;
1334         parms.options = NULL;
1335         parms.dp = dp;
1336         parms.port_no = OVSP_LOCAL;
1337         parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1338
1339         vport = new_vport(&parms);
1340         if (IS_ERR(vport)) {
1341                 err = PTR_ERR(vport);
1342                 if (err == -EBUSY)
1343                         err = -EEXIST;
1344
1345                 goto err_destroy_ports_array;
1346         }
1347
1348         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1349                                       info->snd_seq, OVS_DP_CMD_NEW);
1350         err = PTR_ERR(reply);
1351         if (IS_ERR(reply))
1352                 goto err_destroy_local_port;
1353
1354         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1355         list_add_tail(&dp->list_node, &ovs_net->dps);
1356         rtnl_unlock();
1357
1358         genl_notify(reply, genl_info_net(info), info->snd_portid,
1359                     ovs_dp_datapath_multicast_group.id, info->nlhdr,
1360                     GFP_KERNEL);
1361         return 0;
1362
1363 err_destroy_local_port:
1364         ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
1365 err_destroy_ports_array:
1366         kfree(dp->ports);
1367 err_destroy_percpu:
1368         free_percpu(dp->stats_percpu);
1369 err_destroy_table:
1370         ovs_flow_tbl_destroy(genl_dereference(dp->table));
1371 err_free_dp:
1372         release_net(ovs_dp_get_net(dp));
1373         kfree(dp);
1374 err_unlock_rtnl:
1375         rtnl_unlock();
1376 err:
1377         return err;
1378 }
1379
1380 /* Called with genl_mutex. */
1381 static void __dp_destroy(struct datapath *dp)
1382 {
1383         int i;
1384
1385         rtnl_lock();
1386
1387         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1388                 struct vport *vport;
1389                 struct hlist_node *node, *n;
1390
1391                 hlist_for_each_entry_safe(vport, node, n, &dp->ports[i], dp_hash_node)
1392                         if (vport->port_no != OVSP_LOCAL)
1393                                 ovs_dp_detach_port(vport);
1394         }
1395
1396         list_del(&dp->list_node);
1397         ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
1398
1399         /* rtnl_unlock() will wait until all the references to devices that
1400          * are pending unregistration have been dropped.  We do it here to
1401          * ensure that any internal devices (which contain DP pointers) are
1402          * fully destroyed before freeing the datapath.
1403          */
1404         rtnl_unlock();
1405
1406         call_rcu(&dp->rcu, destroy_dp_rcu);
1407 }
1408
1409 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1410 {
1411         struct sk_buff *reply;
1412         struct datapath *dp;
1413         int err;
1414
1415         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1416         err = PTR_ERR(dp);
1417         if (IS_ERR(dp))
1418                 return err;
1419
1420         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1421                                       info->snd_seq, OVS_DP_CMD_DEL);
1422         err = PTR_ERR(reply);
1423         if (IS_ERR(reply))
1424                 return err;
1425
1426         __dp_destroy(dp);
1427
1428         genl_notify(reply, genl_info_net(info), info->snd_portid,
1429                     ovs_dp_datapath_multicast_group.id, info->nlhdr,
1430                     GFP_KERNEL);
1431
1432         return 0;
1433 }
1434
1435 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1436 {
1437         struct sk_buff *reply;
1438         struct datapath *dp;
1439         int err;
1440
1441         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1442         if (IS_ERR(dp))
1443                 return PTR_ERR(dp);
1444
1445         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1446                                       info->snd_seq, OVS_DP_CMD_NEW);
1447         if (IS_ERR(reply)) {
1448                 err = PTR_ERR(reply);
1449                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1450                                 ovs_dp_datapath_multicast_group.id, err);
1451                 return 0;
1452         }
1453
1454         genl_notify(reply, genl_info_net(info), info->snd_portid,
1455                     ovs_dp_datapath_multicast_group.id, info->nlhdr,
1456                     GFP_KERNEL);
1457
1458         return 0;
1459 }
1460
1461 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1462 {
1463         struct sk_buff *reply;
1464         struct datapath *dp;
1465
1466         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1467         if (IS_ERR(dp))
1468                 return PTR_ERR(dp);
1469
1470         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1471                                       info->snd_seq, OVS_DP_CMD_NEW);
1472         if (IS_ERR(reply))
1473                 return PTR_ERR(reply);
1474
1475         return genlmsg_reply(reply, info);
1476 }
1477
1478 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1479 {
1480         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1481         struct datapath *dp;
1482         int skip = cb->args[0];
1483         int i = 0;
1484
1485         list_for_each_entry(dp, &ovs_net->dps, list_node) {
1486                 if (i >= skip &&
1487                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1488                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1489                                          OVS_DP_CMD_NEW) < 0)
1490                         break;
1491                 i++;
1492         }
1493
1494         cb->args[0] = i;
1495
1496         return skb->len;
1497 }
1498
1499 static struct genl_ops dp_datapath_genl_ops[] = {
1500         { .cmd = OVS_DP_CMD_NEW,
1501           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1502           .policy = datapath_policy,
1503           .doit = ovs_dp_cmd_new
1504         },
1505         { .cmd = OVS_DP_CMD_DEL,
1506           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1507           .policy = datapath_policy,
1508           .doit = ovs_dp_cmd_del
1509         },
1510         { .cmd = OVS_DP_CMD_GET,
1511           .flags = 0,               /* OK for unprivileged users. */
1512           .policy = datapath_policy,
1513           .doit = ovs_dp_cmd_get,
1514           .dumpit = ovs_dp_cmd_dump
1515         },
1516         { .cmd = OVS_DP_CMD_SET,
1517           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1518           .policy = datapath_policy,
1519           .doit = ovs_dp_cmd_set,
1520         },
1521 };
1522
1523 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1524         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1525         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1526         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1527         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1528         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1529         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1530 };
1531
1532 static struct genl_family dp_vport_genl_family = {
1533         .id = GENL_ID_GENERATE,
1534         .hdrsize = sizeof(struct ovs_header),
1535         .name = OVS_VPORT_FAMILY,
1536         .version = OVS_VPORT_VERSION,
1537         .maxattr = OVS_VPORT_ATTR_MAX,
1538         .netnsok = true
1539 };
1540
1541 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1542         .name = OVS_VPORT_MCGROUP
1543 };
1544
1545 /* Called with RTNL lock or RCU read lock. */
1546 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1547                                    u32 portid, u32 seq, u32 flags, u8 cmd)
1548 {
1549         struct ovs_header *ovs_header;
1550         struct ovs_vport_stats vport_stats;
1551         int err;
1552
1553         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1554                                  flags, cmd);
1555         if (!ovs_header)
1556                 return -EMSGSIZE;
1557
1558         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1559
1560         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1561             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1562             nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1563             nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
1564                 goto nla_put_failure;
1565
1566         ovs_vport_get_stats(vport, &vport_stats);
1567         if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1568                     &vport_stats))
1569                 goto nla_put_failure;
1570
1571         err = ovs_vport_get_options(vport, skb);
1572         if (err == -EMSGSIZE)
1573                 goto error;
1574
1575         return genlmsg_end(skb, ovs_header);
1576
1577 nla_put_failure:
1578         err = -EMSGSIZE;
1579 error:
1580         genlmsg_cancel(skb, ovs_header);
1581         return err;
1582 }
1583
1584 /* Called with RTNL lock or RCU read lock. */
1585 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1586                                          u32 seq, u8 cmd)
1587 {
1588         struct sk_buff *skb;
1589         int retval;
1590
1591         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1592         if (!skb)
1593                 return ERR_PTR(-ENOMEM);
1594
1595         retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1596         if (retval < 0) {
1597                 kfree_skb(skb);
1598                 return ERR_PTR(retval);
1599         }
1600         return skb;
1601 }
1602
1603 /* Called with RTNL lock or RCU read lock. */
1604 static struct vport *lookup_vport(struct net *net,
1605                                   struct ovs_header *ovs_header,
1606                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1607 {
1608         struct datapath *dp;
1609         struct vport *vport;
1610
1611         if (a[OVS_VPORT_ATTR_NAME]) {
1612                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1613                 if (!vport)
1614                         return ERR_PTR(-ENODEV);
1615                 if (ovs_header->dp_ifindex &&
1616                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1617                         return ERR_PTR(-ENODEV);
1618                 return vport;
1619         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1620                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1621
1622                 if (port_no >= DP_MAX_PORTS)
1623                         return ERR_PTR(-EFBIG);
1624
1625                 dp = get_dp(net, ovs_header->dp_ifindex);
1626                 if (!dp)
1627                         return ERR_PTR(-ENODEV);
1628
1629                 vport = ovs_vport_rtnl_rcu(dp, port_no);
1630                 if (!vport)
1631                         return ERR_PTR(-ENOENT);
1632                 return vport;
1633         } else
1634                 return ERR_PTR(-EINVAL);
1635 }
1636
1637 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1638 {
1639         struct nlattr **a = info->attrs;
1640         struct ovs_header *ovs_header = info->userhdr;
1641         struct vport_parms parms;
1642         struct sk_buff *reply;
1643         struct vport *vport;
1644         struct datapath *dp;
1645         u32 port_no;
1646         int err;
1647
1648         err = -EINVAL;
1649         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1650             !a[OVS_VPORT_ATTR_UPCALL_PID])
1651                 goto exit;
1652
1653         rtnl_lock();
1654         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1655         err = -ENODEV;
1656         if (!dp)
1657                 goto exit_unlock;
1658
1659         if (a[OVS_VPORT_ATTR_PORT_NO]) {
1660                 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1661
1662                 err = -EFBIG;
1663                 if (port_no >= DP_MAX_PORTS)
1664                         goto exit_unlock;
1665
1666                 vport = ovs_vport_rtnl_rcu(dp, port_no);
1667                 err = -EBUSY;
1668                 if (vport)
1669                         goto exit_unlock;
1670         } else {
1671                 for (port_no = 1; ; port_no++) {
1672                         if (port_no >= DP_MAX_PORTS) {
1673                                 err = -EFBIG;
1674                                 goto exit_unlock;
1675                         }
1676                         vport = ovs_vport_rtnl(dp, port_no);
1677                         if (!vport)
1678                                 break;
1679                 }
1680         }
1681
1682         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1683         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1684         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1685         parms.dp = dp;
1686         parms.port_no = port_no;
1687         parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1688
1689         vport = new_vport(&parms);
1690         err = PTR_ERR(vport);
1691         if (IS_ERR(vport))
1692                 goto exit_unlock;
1693
1694         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1695                                          OVS_VPORT_CMD_NEW);
1696         if (IS_ERR(reply)) {
1697                 err = PTR_ERR(reply);
1698                 ovs_dp_detach_port(vport);
1699                 goto exit_unlock;
1700         }
1701         genl_notify(reply, genl_info_net(info), info->snd_portid,
1702                     ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1703
1704 exit_unlock:
1705         rtnl_unlock();
1706 exit:
1707         return err;
1708 }
1709
1710 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1711 {
1712         struct nlattr **a = info->attrs;
1713         struct sk_buff *reply;
1714         struct vport *vport;
1715         int err;
1716
1717         rtnl_lock();
1718         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1719         err = PTR_ERR(vport);
1720         if (IS_ERR(vport))
1721                 goto exit_unlock;
1722
1723         err = 0;
1724         if (a[OVS_VPORT_ATTR_TYPE] &&
1725             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type)
1726                 err = -EINVAL;
1727
1728         if (!err && a[OVS_VPORT_ATTR_OPTIONS])
1729                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1730         if (err)
1731                 goto exit_unlock;
1732         if (a[OVS_VPORT_ATTR_UPCALL_PID])
1733                 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1734
1735         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1736                                          OVS_VPORT_CMD_NEW);
1737         if (IS_ERR(reply)) {
1738                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1739                                 ovs_dp_vport_multicast_group.id, PTR_ERR(reply));
1740                 goto exit_unlock;
1741         }
1742
1743         genl_notify(reply, genl_info_net(info), info->snd_portid,
1744                     ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1745
1746 exit_unlock:
1747         rtnl_unlock();
1748         return err;
1749 }
1750
1751 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1752 {
1753         struct nlattr **a = info->attrs;
1754         struct sk_buff *reply;
1755         struct vport *vport;
1756         int err;
1757
1758         rtnl_lock();
1759         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1760         err = PTR_ERR(vport);
1761         if (IS_ERR(vport))
1762                 goto exit_unlock;
1763
1764         if (vport->port_no == OVSP_LOCAL) {
1765                 err = -EINVAL;
1766                 goto exit_unlock;
1767         }
1768
1769         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1770                                          OVS_VPORT_CMD_DEL);
1771         err = PTR_ERR(reply);
1772         if (IS_ERR(reply))
1773                 goto exit_unlock;
1774
1775         ovs_dp_detach_port(vport);
1776
1777         genl_notify(reply, genl_info_net(info), info->snd_portid,
1778                     ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1779
1780 exit_unlock:
1781         rtnl_unlock();
1782         return err;
1783 }
1784
1785 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1786 {
1787         struct nlattr **a = info->attrs;
1788         struct ovs_header *ovs_header = info->userhdr;
1789         struct sk_buff *reply;
1790         struct vport *vport;
1791         int err;
1792
1793         rcu_read_lock();
1794         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1795         err = PTR_ERR(vport);
1796         if (IS_ERR(vport))
1797                 goto exit_unlock;
1798
1799         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1800                                          OVS_VPORT_CMD_NEW);
1801         err = PTR_ERR(reply);
1802         if (IS_ERR(reply))
1803                 goto exit_unlock;
1804
1805         rcu_read_unlock();
1806
1807         return genlmsg_reply(reply, info);
1808
1809 exit_unlock:
1810         rcu_read_unlock();
1811         return err;
1812 }
1813
1814 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1815 {
1816         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1817         struct datapath *dp;
1818         int bucket = cb->args[0], skip = cb->args[1];
1819         int i, j = 0;
1820
1821         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1822         if (!dp)
1823                 return -ENODEV;
1824
1825         rcu_read_lock();
1826         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1827                 struct vport *vport;
1828                 struct hlist_node *n;
1829
1830                 j = 0;
1831                 hlist_for_each_entry_rcu(vport, n, &dp->ports[i], dp_hash_node) {
1832                         if (j >= skip &&
1833                             ovs_vport_cmd_fill_info(vport, skb,
1834                                                     NETLINK_CB(cb->skb).portid,
1835                                                     cb->nlh->nlmsg_seq,
1836                                                     NLM_F_MULTI,
1837                                                     OVS_VPORT_CMD_NEW) < 0)
1838                                 goto out;
1839
1840                         j++;
1841                 }
1842                 skip = 0;
1843         }
1844 out:
1845         rcu_read_unlock();
1846
1847         cb->args[0] = i;
1848         cb->args[1] = j;
1849
1850         return skb->len;
1851 }
1852
1853 static struct genl_ops dp_vport_genl_ops[] = {
1854         { .cmd = OVS_VPORT_CMD_NEW,
1855           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1856           .policy = vport_policy,
1857           .doit = ovs_vport_cmd_new
1858         },
1859         { .cmd = OVS_VPORT_CMD_DEL,
1860           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1861           .policy = vport_policy,
1862           .doit = ovs_vport_cmd_del
1863         },
1864         { .cmd = OVS_VPORT_CMD_GET,
1865           .flags = 0,               /* OK for unprivileged users. */
1866           .policy = vport_policy,
1867           .doit = ovs_vport_cmd_get,
1868           .dumpit = ovs_vport_cmd_dump
1869         },
1870         { .cmd = OVS_VPORT_CMD_SET,
1871           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1872           .policy = vport_policy,
1873           .doit = ovs_vport_cmd_set,
1874         },
1875 };
1876
1877 struct genl_family_and_ops {
1878         struct genl_family *family;
1879         struct genl_ops *ops;
1880         int n_ops;
1881         struct genl_multicast_group *group;
1882 };
1883
1884 static const struct genl_family_and_ops dp_genl_families[] = {
1885         { &dp_datapath_genl_family,
1886           dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1887           &ovs_dp_datapath_multicast_group },
1888         { &dp_vport_genl_family,
1889           dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1890           &ovs_dp_vport_multicast_group },
1891         { &dp_flow_genl_family,
1892           dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1893           &ovs_dp_flow_multicast_group },
1894         { &dp_packet_genl_family,
1895           dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1896           NULL },
1897 };
1898
1899 static void dp_unregister_genl(int n_families)
1900 {
1901         int i;
1902
1903         for (i = 0; i < n_families; i++)
1904                 genl_unregister_family(dp_genl_families[i].family);
1905 }
1906
1907 static int dp_register_genl(void)
1908 {
1909         int n_registered;
1910         int err;
1911         int i;
1912
1913         n_registered = 0;
1914         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1915                 const struct genl_family_and_ops *f = &dp_genl_families[i];
1916
1917                 err = genl_register_family_with_ops(f->family, f->ops,
1918                                                     f->n_ops);
1919                 if (err)
1920                         goto error;
1921                 n_registered++;
1922
1923                 if (f->group) {
1924                         err = genl_register_mc_group(f->family, f->group);
1925                         if (err)
1926                                 goto error;
1927                 }
1928         }
1929
1930         return 0;
1931
1932 error:
1933         dp_unregister_genl(n_registered);
1934         return err;
1935 }
1936
1937 static void rehash_flow_table(struct work_struct *work)
1938 {
1939         struct datapath *dp;
1940         struct net *net;
1941
1942         genl_lock();
1943         rtnl_lock();
1944         for_each_net(net) {
1945                 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1946
1947                 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1948                         struct flow_table *old_table = genl_dereference(dp->table);
1949                         struct flow_table *new_table;
1950
1951                         new_table = ovs_flow_tbl_rehash(old_table);
1952                         if (!IS_ERR(new_table)) {
1953                                 rcu_assign_pointer(dp->table, new_table);
1954                                 ovs_flow_tbl_deferred_destroy(old_table);
1955                         }
1956                 }
1957         }
1958         rtnl_unlock();
1959         genl_unlock();
1960
1961         schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1962 }
1963
1964 static int __net_init ovs_init_net(struct net *net)
1965 {
1966         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1967
1968         INIT_LIST_HEAD(&ovs_net->dps);
1969         return 0;
1970 }
1971
1972 static void __net_exit ovs_exit_net(struct net *net)
1973 {
1974         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1975         struct datapath *dp, *dp_next;
1976
1977         genl_lock();
1978         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
1979                 __dp_destroy(dp);
1980         genl_unlock();
1981 }
1982
1983 static struct pernet_operations ovs_net_ops = {
1984         .init = ovs_init_net,
1985         .exit = ovs_exit_net,
1986         .id   = &ovs_net_id,
1987         .size = sizeof(struct ovs_net),
1988 };
1989
1990 static int __init dp_init(void)
1991 {
1992         struct sk_buff *dummy_skb;
1993         int err;
1994
1995         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
1996
1997         pr_info("Open vSwitch switching datapath\n");
1998
1999         err = ovs_flow_init();
2000         if (err)
2001                 goto error;
2002
2003         err = ovs_vport_init();
2004         if (err)
2005                 goto error_flow_exit;
2006
2007         err = register_pernet_device(&ovs_net_ops);
2008         if (err)
2009                 goto error_vport_exit;
2010
2011         err = register_netdevice_notifier(&ovs_dp_device_notifier);
2012         if (err)
2013                 goto error_netns_exit;
2014
2015         err = dp_register_genl();
2016         if (err < 0)
2017                 goto error_unreg_notifier;
2018
2019         schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2020
2021         return 0;
2022
2023 error_unreg_notifier:
2024         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2025 error_netns_exit:
2026         unregister_pernet_device(&ovs_net_ops);
2027 error_vport_exit:
2028         ovs_vport_exit();
2029 error_flow_exit:
2030         ovs_flow_exit();
2031 error:
2032         return err;
2033 }
2034
2035 static void dp_cleanup(void)
2036 {
2037         cancel_delayed_work_sync(&rehash_flow_wq);
2038         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2039         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2040         unregister_pernet_device(&ovs_net_ops);
2041         rcu_barrier();
2042         ovs_vport_exit();
2043         ovs_flow_exit();
2044 }
2045
2046 module_init(dp_init);
2047 module_exit(dp_cleanup);
2048
2049 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2050 MODULE_LICENSE("GPL");