net/openvswitch/datapath.c

   1 /*
   2  * Copyright (c) 2007-2014 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 <net/genetlink.h>
  51 #include <net/net_namespace.h>
  52 #include <net/netns/generic.h>
  53
  54 #include "datapath.h"
  55 #include "flow.h"
  56 #include "flow_table.h"
  57 #include "flow_netlink.h"
  58 #include "vport-internal_dev.h"
  59 #include "vport-netdev.h"
  60
  61 int ovs_net_id __read_mostly;
  62 EXPORT_SYMBOL_GPL(ovs_net_id);
  63
  64 static struct genl_family dp_packet_genl_family;
  65 static struct genl_family dp_flow_genl_family;
  66 static struct genl_family dp_datapath_genl_family;
  67
  68 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
  69         .name = OVS_FLOW_MCGROUP,
  70 };
  71
  72 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
  73         .name = OVS_DATAPATH_MCGROUP,
  74 };
  75
  76 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
  77         .name = OVS_VPORT_MCGROUP,
  78 };
  79
  80 /* Check if need to build a reply message.
  81  * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
  82 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
  83                             unsigned int group)
  84 {
  85         return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
  86                genl_has_listeners(family, genl_info_net(info)->genl_sock,
  87                                   group);
  88 }
  89
  90 static void ovs_notify(struct genl_family *family,
  91                        struct sk_buff *skb, struct genl_info *info)
  92 {
  93         genl_notify(family, skb, genl_info_net(info), info->snd_portid,
  94                     0, info->nlhdr, GFP_KERNEL);
  95 }
  96
  97 /**
  98  * DOC: Locking:
  99  *
 100  * All writes e.g. Writes to device state (add/remove datapath, port, set
 101  * operations on vports, etc.), Writes to other state (flow table
 102  * modifications, set miscellaneous datapath parameters, etc.) are protected
 103  * by ovs_lock.
 104  *
 105  * Reads are protected by RCU.
 106  *
 107  * There are a few special cases (mostly stats) that have their own
 108  * synchronization but they nest under all of above and don't interact with
 109  * each other.
 110  *
 111  * The RTNL lock nests inside ovs_mutex.
 112  */
 113
 114 static DEFINE_MUTEX(ovs_mutex);
 115
 116 void ovs_lock(void)
 117 {
 118         mutex_lock(&ovs_mutex);
 119 }
 120
 121 void ovs_unlock(void)
 122 {
 123         mutex_unlock(&ovs_mutex);
 124 }
 125
 126 #ifdef CONFIG_LOCKDEP
 127 int lockdep_ovsl_is_held(void)
 128 {
 129         if (debug_locks)
 130                 return lockdep_is_held(&ovs_mutex);
 131         else
 132                 return 1;
 133 }
 134 EXPORT_SYMBOL_GPL(lockdep_ovsl_is_held);
 135 #endif
 136
 137 static struct vport *new_vport(const struct vport_parms *);
 138 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
 139                              const struct sw_flow_key *,
 140                              const struct dp_upcall_info *);
 141 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
 142                                   const struct sw_flow_key *,
 143                                   const struct dp_upcall_info *);
 144
 145 /* Must be called with rcu_read_lock. */
 146 static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
 147 {
 148         struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
 149
 150         if (dev) {
 151                 struct vport *vport = ovs_internal_dev_get_vport(dev);
 152                 if (vport)
 153                         return vport->dp;
 154         }
 155
 156         return NULL;
 157 }
 158
 159 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the
 160  * returned dp pointer valid.
 161  */
 162 static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
 163 {
 164         struct datapath *dp;
 165
 166         WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
 167         rcu_read_lock();
 168         dp = get_dp_rcu(net, dp_ifindex);
 169         rcu_read_unlock();
 170
 171         return dp;
 172 }
 173
 174 /* Must be called with rcu_read_lock or ovs_mutex. */
 175 const char *ovs_dp_name(const struct datapath *dp)
 176 {
 177         struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
 178         return vport->ops->get_name(vport);
 179 }
 180
 181 static int get_dpifindex(const struct datapath *dp)
 182 {
 183         struct vport *local;
 184         int ifindex;
 185
 186         rcu_read_lock();
 187
 188         local = ovs_vport_rcu(dp, OVSP_LOCAL);
 189         if (local)
 190                 ifindex = netdev_vport_priv(local)->dev->ifindex;
 191         else
 192                 ifindex = 0;
 193
 194         rcu_read_unlock();
 195
 196         return ifindex;
 197 }
 198
 199 static void destroy_dp_rcu(struct rcu_head *rcu)
 200 {
 201         struct datapath *dp = container_of(rcu, struct datapath, rcu);
 202
 203         ovs_flow_tbl_destroy(&dp->table);
 204         free_percpu(dp->stats_percpu);
 205         release_net(ovs_dp_get_net(dp));
 206         kfree(dp->ports);
 207         kfree(dp);
 208 }
 209
 210 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
 211                                             u16 port_no)
 212 {
 213         return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
 214 }
 215
 216 /* Called with ovs_mutex or RCU read lock. */
 217 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
 218 {
 219         struct vport *vport;
 220         struct hlist_head *head;
 221
 222         head = vport_hash_bucket(dp, port_no);
 223         hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
 224                 if (vport->port_no == port_no)
 225                         return vport;
 226         }
 227         return NULL;
 228 }
 229
 230 /* Called with ovs_mutex. */
 231 static struct vport *new_vport(const struct vport_parms *parms)
 232 {
 233         struct vport *vport;
 234
 235         vport = ovs_vport_add(parms);
 236         if (!IS_ERR(vport)) {
 237                 struct datapath *dp = parms->dp;
 238                 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
 239
 240                 hlist_add_head_rcu(&vport->dp_hash_node, head);
 241         }
 242         return vport;
 243 }
 244
 245 void ovs_dp_detach_port(struct vport *p)
 246 {
 247         ASSERT_OVSL();
 248
 249         /* First drop references to device. */
 250         hlist_del_rcu(&p->dp_hash_node);
 251
 252         /* Then destroy it. */
 253         ovs_vport_del(p);
 254 }
 255
 256 /* Must be called with rcu_read_lock. */
 257 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
 258 {
 259         const struct vport *p = OVS_CB(skb)->input_vport;
 260         struct datapath *dp = p->dp;
 261         struct sw_flow *flow;
 262         struct sw_flow_actions *sf_acts;
 263         struct dp_stats_percpu *stats;
 264         u64 *stats_counter;
 265         u32 n_mask_hit;
 266
 267         stats = this_cpu_ptr(dp->stats_percpu);
 268
 269         /* Look up flow. */
 270         flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
 271         if (unlikely(!flow)) {
 272                 struct dp_upcall_info upcall;
 273                 int error;
 274
 275                 upcall.cmd = OVS_PACKET_CMD_MISS;
 276                 upcall.userdata = NULL;
 277                 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
 278                 upcall.egress_tun_info = NULL;
 279                 error = ovs_dp_upcall(dp, skb, key, &upcall);
 280                 if (unlikely(error))
 281                         kfree_skb(skb);
 282                 else
 283                         consume_skb(skb);
 284                 stats_counter = &stats->n_missed;
 285                 goto out;
 286         }
 287
 288         ovs_flow_stats_update(flow, key->tp.flags, skb);
 289         sf_acts = rcu_dereference(flow->sf_acts);
 290         ovs_execute_actions(dp, skb, sf_acts, key);
 291
 292         stats_counter = &stats->n_hit;
 293
 294 out:
 295         /* Update datapath statistics. */
 296         u64_stats_update_begin(&stats->syncp);
 297         (*stats_counter)++;
 298         stats->n_mask_hit += n_mask_hit;
 299         u64_stats_update_end(&stats->syncp);
 300 }
 301
 302 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
 303                   const struct sw_flow_key *key,
 304                   const struct dp_upcall_info *upcall_info)
 305 {
 306         struct dp_stats_percpu *stats;
 307         int err;
 308
 309         if (upcall_info->portid == 0) {
 310                 err = -ENOTCONN;
 311                 goto err;
 312         }
 313
 314         if (!skb_is_gso(skb))
 315                 err = queue_userspace_packet(dp, skb, key, upcall_info);
 316         else
 317                 err = queue_gso_packets(dp, skb, key, upcall_info);
 318         if (err)
 319                 goto err;
 320
 321         return 0;
 322
 323 err:
 324         stats = this_cpu_ptr(dp->stats_percpu);
 325
 326         u64_stats_update_begin(&stats->syncp);
 327         stats->n_lost++;
 328         u64_stats_update_end(&stats->syncp);
 329
 330         return err;
 331 }
 332
 333 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
 334                              const struct sw_flow_key *key,
 335                              const struct dp_upcall_info *upcall_info)
 336 {
 337         unsigned short gso_type = skb_shinfo(skb)->gso_type;
 338         struct sw_flow_key later_key;
 339         struct sk_buff *segs, *nskb;
 340         struct ovs_skb_cb ovs_cb;
 341         int err;
 342
 343         ovs_cb = *OVS_CB(skb);
 344         segs = __skb_gso_segment(skb, NETIF_F_SG, false);
 345         *OVS_CB(skb) = ovs_cb;
 346         if (IS_ERR(segs))
 347                 return PTR_ERR(segs);
 348         if (segs == NULL)
 349                 return -EINVAL;
 350
 351         if (gso_type & SKB_GSO_UDP) {
 352                 /* The initial flow key extracted by ovs_flow_key_extract()
 353                  * in this case is for a first fragment, so we need to
 354                  * properly mark later fragments.
 355                  */
 356                 later_key = *key;
 357                 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
 358         }
 359
 360         /* Queue all of the segments. */
 361         skb = segs;
 362         do {
 363                 *OVS_CB(skb) = ovs_cb;
 364                 if (gso_type & SKB_GSO_UDP && skb != segs)
 365                         key = &later_key;
 366
 367                 err = queue_userspace_packet(dp, skb, key, upcall_info);
 368                 if (err)
 369                         break;
 370
 371         } while ((skb = skb->next));
 372
 373         /* Free all of the segments. */
 374         skb = segs;
 375         do {
 376                 nskb = skb->next;
 377                 if (err)
 378                         kfree_skb(skb);
 379                 else
 380                         consume_skb(skb);
 381         } while ((skb = nskb));
 382         return err;
 383 }
 384
 385 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
 386                               unsigned int hdrlen)
 387 {
 388         size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
 389                 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
 390                 + nla_total_size(ovs_key_attr_size()); /* OVS_PACKET_ATTR_KEY */
 391
 392         /* OVS_PACKET_ATTR_USERDATA */
 393         if (upcall_info->userdata)
 394                 size += NLA_ALIGN(upcall_info->userdata->nla_len);
 395
 396         /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
 397         if (upcall_info->egress_tun_info)
 398                 size += nla_total_size(ovs_tun_key_attr_size());
 399
 400         return size;
 401 }
 402
 403 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
 404                                   const struct sw_flow_key *key,
 405                                   const struct dp_upcall_info *upcall_info)
 406 {
 407         struct ovs_header *upcall;
 408         struct sk_buff *nskb = NULL;
 409         struct sk_buff *user_skb = NULL; /* to be queued to userspace */
 410         struct nlattr *nla;
 411         struct genl_info info = {
 412                 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
 413                 .snd_portid = upcall_info->portid,
 414         };
 415         size_t len;
 416         unsigned int hlen;
 417         int err, dp_ifindex;
 418
 419         dp_ifindex = get_dpifindex(dp);
 420         if (!dp_ifindex)
 421                 return -ENODEV;
 422
 423         if (vlan_tx_tag_present(skb)) {
 424                 nskb = skb_clone(skb, GFP_ATOMIC);
 425                 if (!nskb)
 426                         return -ENOMEM;
 427
 428                 nskb = __vlan_hwaccel_push_inside(nskb);
 429                 if (!nskb)
 430                         return -ENOMEM;
 431
 432                 skb = nskb;
 433         }
 434
 435         if (nla_attr_size(skb->len) > USHRT_MAX) {
 436                 err = -EFBIG;
 437                 goto out;
 438         }
 439
 440         /* Complete checksum if needed */
 441         if (skb->ip_summed == CHECKSUM_PARTIAL &&
 442             (err = skb_checksum_help(skb)))
 443                 goto out;
 444
 445         /* Older versions of OVS user space enforce alignment of the last
 446          * Netlink attribute to NLA_ALIGNTO which would require extensive
 447          * padding logic. Only perform zerocopy if padding is not required.
 448          */
 449         if (dp->user_features & OVS_DP_F_UNALIGNED)
 450                 hlen = skb_zerocopy_headlen(skb);
 451         else
 452                 hlen = skb->len;
 453
 454         len = upcall_msg_size(upcall_info, hlen);
 455         user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
 456         if (!user_skb) {
 457                 err = -ENOMEM;
 458                 goto out;
 459         }
 460
 461         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
 462                              0, upcall_info->cmd);
 463         upcall->dp_ifindex = dp_ifindex;
 464
 465         nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
 466         err = ovs_nla_put_flow(key, key, user_skb);
 467         BUG_ON(err);
 468         nla_nest_end(user_skb, nla);
 469
 470         if (upcall_info->userdata)
 471                 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
 472                           nla_len(upcall_info->userdata),
 473                           nla_data(upcall_info->userdata));
 474
 475         if (upcall_info->egress_tun_info) {
 476                 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
 477                 err = ovs_nla_put_egress_tunnel_key(user_skb,
 478                                                     upcall_info->egress_tun_info);
 479                 BUG_ON(err);
 480                 nla_nest_end(user_skb, nla);
 481         }
 482
 483         /* Only reserve room for attribute header, packet data is added
 484          * in skb_zerocopy() */
 485         if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
 486                 err = -ENOBUFS;
 487                 goto out;
 488         }
 489         nla->nla_len = nla_attr_size(skb->len);
 490
 491         err = skb_zerocopy(user_skb, skb, skb->len, hlen);
 492         if (err)
 493                 goto out;
 494
 495         /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
 496         if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
 497                 size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len;
 498
 499                 if (plen > 0)
 500                         memset(skb_put(user_skb, plen), 0, plen);
 501         }
 502
 503         ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
 504
 505         err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
 506         user_skb = NULL;
 507 out:
 508         if (err)
 509                 skb_tx_error(skb);
 510         kfree_skb(user_skb);
 511         kfree_skb(nskb);
 512         return err;
 513 }
 514
 515 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 516 {
 517         struct ovs_header *ovs_header = info->userhdr;
 518         struct nlattr **a = info->attrs;
 519         struct sw_flow_actions *acts;
 520         struct sk_buff *packet;
 521         struct sw_flow *flow;
 522         struct sw_flow_actions *sf_acts;
 523         struct datapath *dp;
 524         struct ethhdr *eth;
 525         struct vport *input_vport;
 526         int len;
 527         int err;
 528         bool log = !a[OVS_FLOW_ATTR_PROBE];
 529
 530         err = -EINVAL;
 531         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 532             !a[OVS_PACKET_ATTR_ACTIONS])
 533                 goto err;
 534
 535         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 536         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 537         err = -ENOMEM;
 538         if (!packet)
 539                 goto err;
 540         skb_reserve(packet, NET_IP_ALIGN);
 541
 542         nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
 543
 544         skb_reset_mac_header(packet);
 545         eth = eth_hdr(packet);
 546
 547         /* Normally, setting the skb 'protocol' field would be handled by a
 548          * call to eth_type_trans(), but it assumes there's a sending
 549          * device, which we may not have. */
 550         if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
 551                 packet->protocol = eth->h_proto;
 552         else
 553                 packet->protocol = htons(ETH_P_802_2);
 554
 555         /* Build an sw_flow for sending this packet. */
 556         flow = ovs_flow_alloc();
 557         err = PTR_ERR(flow);
 558         if (IS_ERR(flow))
 559                 goto err_kfree_skb;
 560
 561         err = ovs_flow_key_extract_userspace(a[OVS_PACKET_ATTR_KEY], packet,
 562                                              &flow->key, log);
 563         if (err)
 564                 goto err_flow_free;
 565
 566         err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
 567                                    &flow->key, &acts, log);
 568         if (err)
 569                 goto err_flow_free;
 570
 571         rcu_assign_pointer(flow->sf_acts, acts);
 572         OVS_CB(packet)->egress_tun_info = NULL;
 573         packet->priority = flow->key.phy.priority;
 574         packet->mark = flow->key.phy.skb_mark;
 575
 576         rcu_read_lock();
 577         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
 578         err = -ENODEV;
 579         if (!dp)
 580                 goto err_unlock;
 581
 582         input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
 583         if (!input_vport)
 584                 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
 585
 586         if (!input_vport)
 587                 goto err_unlock;
 588
 589         OVS_CB(packet)->input_vport = input_vport;
 590         sf_acts = rcu_dereference(flow->sf_acts);
 591
 592         local_bh_disable();
 593         err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
 594         local_bh_enable();
 595         rcu_read_unlock();
 596
 597         ovs_flow_free(flow, false);
 598         return err;
 599
 600 err_unlock:
 601         rcu_read_unlock();
 602 err_flow_free:
 603         ovs_flow_free(flow, false);
 604 err_kfree_skb:
 605         kfree_skb(packet);
 606 err:
 607         return err;
 608 }
 609
 610 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 611         [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
 612         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 613         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 614 };
 615
 616 static const struct genl_ops dp_packet_genl_ops[] = {
 617         { .cmd = OVS_PACKET_CMD_EXECUTE,
 618           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 619           .policy = packet_policy,
 620           .doit = ovs_packet_cmd_execute
 621         }
 622 };
 623
 624 static struct genl_family dp_packet_genl_family = {
 625         .id = GENL_ID_GENERATE,
 626         .hdrsize = sizeof(struct ovs_header),
 627         .name = OVS_PACKET_FAMILY,
 628         .version = OVS_PACKET_VERSION,
 629         .maxattr = OVS_PACKET_ATTR_MAX,
 630         .netnsok = true,
 631         .parallel_ops = true,
 632         .ops = dp_packet_genl_ops,
 633         .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
 634 };
 635
 636 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
 637                          struct ovs_dp_megaflow_stats *mega_stats)
 638 {
 639         int i;
 640
 641         memset(mega_stats, 0, sizeof(*mega_stats));
 642
 643         stats->n_flows = ovs_flow_tbl_count(&dp->table);
 644         mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
 645
 646         stats->n_hit = stats->n_missed = stats->n_lost = 0;
 647
 648         for_each_possible_cpu(i) {
 649                 const struct dp_stats_percpu *percpu_stats;
 650                 struct dp_stats_percpu local_stats;
 651                 unsigned int start;
 652
 653                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 654
 655                 do {
 656                         start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
 657                         local_stats = *percpu_stats;
 658                 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
 659
 660                 stats->n_hit += local_stats.n_hit;
 661                 stats->n_missed += local_stats.n_missed;
 662                 stats->n_lost += local_stats.n_lost;
 663                 mega_stats->n_mask_hit += local_stats.n_mask_hit;
 664         }
 665 }
 666
 667 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
 668 {
 669         return NLMSG_ALIGN(sizeof(struct ovs_header))
 670                 + nla_total_size(ovs_key_attr_size()) /* OVS_FLOW_ATTR_KEY */
 671                 + nla_total_size(ovs_key_attr_size()) /* OVS_FLOW_ATTR_MASK */
 672                 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
 673                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
 674                 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
 675                 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
 676 }
 677
 678 /* Called with ovs_mutex or RCU read lock. */
 679 static int ovs_flow_cmd_fill_match(const struct sw_flow *flow,
 680                                    struct sk_buff *skb)
 681 {
 682         struct nlattr *nla;
 683         int err;
 684
 685         /* Fill flow key. */
 686         nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
 687         if (!nla)
 688                 return -EMSGSIZE;
 689
 690         err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb);
 691         if (err)
 692                 return err;
 693
 694         nla_nest_end(skb, nla);
 695
 696         /* Fill flow mask. */
 697         nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
 698         if (!nla)
 699                 return -EMSGSIZE;
 700
 701         err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb);
 702         if (err)
 703                 return err;
 704
 705         nla_nest_end(skb, nla);
 706         return 0;
 707 }
 708
 709 /* Called with ovs_mutex or RCU read lock. */
 710 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
 711                                    struct sk_buff *skb)
 712 {
 713         struct ovs_flow_stats stats;
 714         __be16 tcp_flags;
 715         unsigned long used;
 716
 717         ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
 718
 719         if (used &&
 720             nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
 721                 return -EMSGSIZE;
 722
 723         if (stats.n_packets &&
 724             nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
 725                 return -EMSGSIZE;
 726
 727         if ((u8)ntohs(tcp_flags) &&
 728              nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
 729                 return -EMSGSIZE;
 730
 731         return 0;
 732 }
 733
 734 /* Called with ovs_mutex or RCU read lock. */
 735 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
 736                                      struct sk_buff *skb, int skb_orig_len)
 737 {
 738         struct nlattr *start;
 739         int err;
 740
 741         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 742          * this is the first flow to be dumped into 'skb'.  This is unusual for
 743          * Netlink but individual action lists can be longer than
 744          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 745          * The userspace caller can always fetch the actions separately if it
 746          * really wants them.  (Most userspace callers in fact don't care.)
 747          *
 748          * This can only fail for dump operations because the skb is always
 749          * properly sized for single flows.
 750          */
 751         start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
 752         if (start) {
 753                 const struct sw_flow_actions *sf_acts;
 754
 755                 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
 756                 err = ovs_nla_put_actions(sf_acts->actions,
 757                                           sf_acts->actions_len, skb);
 758
 759                 if (!err)
 760                         nla_nest_end(skb, start);
 761                 else {
 762                         if (skb_orig_len)
 763                                 return err;
 764
 765                         nla_nest_cancel(skb, start);
 766                 }
 767         } else if (skb_orig_len) {
 768                 return -EMSGSIZE;
 769         }
 770
 771         return 0;
 772 }
 773
 774 /* Called with ovs_mutex or RCU read lock. */
 775 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
 776                                   struct sk_buff *skb, u32 portid,
 777                                   u32 seq, u32 flags, u8 cmd)
 778 {
 779         const int skb_orig_len = skb->len;
 780         struct ovs_header *ovs_header;
 781         int err;
 782
 783         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
 784                                  flags, cmd);
 785         if (!ovs_header)
 786                 return -EMSGSIZE;
 787
 788         ovs_header->dp_ifindex = dp_ifindex;
 789
 790         err = ovs_flow_cmd_fill_match(flow, skb);
 791         if (err)
 792                 goto error;
 793
 794         err = ovs_flow_cmd_fill_stats(flow, skb);
 795         if (err)
 796                 goto error;
 797
 798         err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
 799         if (err)
 800                 goto error;
 801
 802         return genlmsg_end(skb, ovs_header);
 803
 804 error:
 805         genlmsg_cancel(skb, ovs_header);
 806         return err;
 807 }
 808
 809 /* May not be called with RCU read lock. */
 810 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
 811                                                struct genl_info *info,
 812                                                bool always)
 813 {
 814         struct sk_buff *skb;
 815
 816         if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
 817                 return NULL;
 818
 819         skb = genlmsg_new_unicast(ovs_flow_cmd_msg_size(acts), info, GFP_KERNEL);
 820         if (!skb)
 821                 return ERR_PTR(-ENOMEM);
 822
 823         return skb;
 824 }
 825
 826 /* Called with ovs_mutex. */
 827 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
 828                                                int dp_ifindex,
 829                                                struct genl_info *info, u8 cmd,
 830                                                bool always)
 831 {
 832         struct sk_buff *skb;
 833         int retval;
 834
 835         skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), info,
 836                                       always);
 837         if (IS_ERR_OR_NULL(skb))
 838                 return skb;
 839
 840         retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
 841                                         info->snd_portid, info->snd_seq, 0,
 842                                         cmd);
 843         BUG_ON(retval < 0);
 844         return skb;
 845 }
 846
 847 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
 848 {
 849         struct nlattr **a = info->attrs;
 850         struct ovs_header *ovs_header = info->userhdr;
 851         struct sw_flow *flow, *new_flow;
 852         struct sw_flow_mask mask;
 853         struct sk_buff *reply;
 854         struct datapath *dp;
 855         struct sw_flow_actions *acts;
 856         struct sw_flow_match match;
 857         int error;
 858         bool log = !a[OVS_FLOW_ATTR_PROBE];
 859
 860         /* Must have key and actions. */
 861         error = -EINVAL;
 862         if (!a[OVS_FLOW_ATTR_KEY]) {
 863                 OVS_NLERR(log, "Flow key attr not present in new flow.");
 864                 goto error;
 865         }
 866         if (!a[OVS_FLOW_ATTR_ACTIONS]) {
 867                 OVS_NLERR(log, "Flow actions attr not present in new flow.");
 868                 goto error;
 869         }
 870
 871         /* Most of the time we need to allocate a new flow, do it before
 872          * locking.
 873          */
 874         new_flow = ovs_flow_alloc();
 875         if (IS_ERR(new_flow)) {
 876                 error = PTR_ERR(new_flow);
 877                 goto error;
 878         }
 879
 880         /* Extract key. */
 881         ovs_match_init(&match, &new_flow->unmasked_key, &mask);
 882         error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY],
 883                                   a[OVS_FLOW_ATTR_MASK], log);
 884         if (error)
 885                 goto err_kfree_flow;
 886
 887         ovs_flow_mask_key(&new_flow->key, &new_flow->unmasked_key, &mask);
 888
 889         /* Validate actions. */
 890         error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &new_flow->key,
 891                                      &acts, log);
 892         if (error) {
 893                 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
 894                 goto err_kfree_flow;
 895         }
 896
 897         reply = ovs_flow_cmd_alloc_info(acts, info, false);
 898         if (IS_ERR(reply)) {
 899                 error = PTR_ERR(reply);
 900                 goto err_kfree_acts;
 901         }
 902
 903         ovs_lock();
 904         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 905         if (unlikely(!dp)) {
 906                 error = -ENODEV;
 907                 goto err_unlock_ovs;
 908         }
 909         /* Check if this is a duplicate flow */
 910         flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->unmasked_key);
 911         if (likely(!flow)) {
 912                 rcu_assign_pointer(new_flow->sf_acts, acts);
 913
 914                 /* Put flow in bucket. */
 915                 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
 916                 if (unlikely(error)) {
 917                         acts = NULL;
 918                         goto err_unlock_ovs;
 919                 }
 920
 921                 if (unlikely(reply)) {
 922                         error = ovs_flow_cmd_fill_info(new_flow,
 923                                                        ovs_header->dp_ifindex,
 924                                                        reply, info->snd_portid,
 925                                                        info->snd_seq, 0,
 926                                                        OVS_FLOW_CMD_NEW);
 927                         BUG_ON(error < 0);
 928                 }
 929                 ovs_unlock();
 930         } else {
 931                 struct sw_flow_actions *old_acts;
 932
 933                 /* Bail out if we're not allowed to modify an existing flow.
 934                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
 935                  * because Generic Netlink treats the latter as a dump
 936                  * request.  We also accept NLM_F_EXCL in case that bug ever
 937                  * gets fixed.
 938                  */
 939                 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
 940                                                          | NLM_F_EXCL))) {
 941                         error = -EEXIST;
 942                         goto err_unlock_ovs;
 943                 }
 944                 /* The unmasked key has to be the same for flow updates. */
 945                 if (unlikely(!ovs_flow_cmp_unmasked_key(flow, &match))) {
 946                         /* Look for any overlapping flow. */
 947                         flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
 948                         if (!flow) {
 949                                 error = -ENOENT;
 950                                 goto err_unlock_ovs;
 951                         }
 952                 }
 953                 /* Update actions. */
 954                 old_acts = ovsl_dereference(flow->sf_acts);
 955                 rcu_assign_pointer(flow->sf_acts, acts);
 956
 957                 if (unlikely(reply)) {
 958                         error = ovs_flow_cmd_fill_info(flow,
 959                                                        ovs_header->dp_ifindex,
 960                                                        reply, info->snd_portid,
 961                                                        info->snd_seq, 0,
 962                                                        OVS_FLOW_CMD_NEW);
 963                         BUG_ON(error < 0);
 964                 }
 965                 ovs_unlock();
 966
 967                 ovs_nla_free_flow_actions(old_acts);
 968                 ovs_flow_free(new_flow, false);
 969         }
 970
 971         if (reply)
 972                 ovs_notify(&dp_flow_genl_family, reply, info);
 973         return 0;
 974
 975 err_unlock_ovs:
 976         ovs_unlock();
 977         kfree_skb(reply);
 978 err_kfree_acts:
 979         kfree(acts);
 980 err_kfree_flow:
 981         ovs_flow_free(new_flow, false);
 982 error:
 983         return error;
 984 }
 985
 986 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
 987 static struct sw_flow_actions *get_flow_actions(const struct nlattr *a,
 988                                                 const struct sw_flow_key *key,
 989                                                 const struct sw_flow_mask *mask,
 990                                                 bool log)
 991 {
 992         struct sw_flow_actions *acts;
 993         struct sw_flow_key masked_key;
 994         int error;
 995
 996         ovs_flow_mask_key(&masked_key, key, mask);
 997         error = ovs_nla_copy_actions(a, &masked_key, &acts, log);
 998         if (error) {
 999                 OVS_NLERR(log,
1000                           "Actions may not be safe on all matching packets");
1001                 return ERR_PTR(error);
1002         }
1003
1004         return acts;
1005 }
1006
1007 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1008 {
1009         struct nlattr **a = info->attrs;
1010         struct ovs_header *ovs_header = info->userhdr;
1011         struct sw_flow_key key;
1012         struct sw_flow *flow;
1013         struct sw_flow_mask mask;
1014         struct sk_buff *reply = NULL;
1015         struct datapath *dp;
1016         struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1017         struct sw_flow_match match;
1018         int error;
1019         bool log = !a[OVS_FLOW_ATTR_PROBE];
1020
1021         /* Extract key. */
1022         error = -EINVAL;
1023         if (!a[OVS_FLOW_ATTR_KEY]) {
1024                 OVS_NLERR(log, "Flow key attribute not present in set flow.");
1025                 goto error;
1026         }
1027
1028         ovs_match_init(&match, &key, &mask);
1029         error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY],
1030                                   a[OVS_FLOW_ATTR_MASK], log);
1031         if (error)
1032                 goto error;
1033
1034         /* Validate actions. */
1035         if (a[OVS_FLOW_ATTR_ACTIONS]) {
1036                 acts = get_flow_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, &mask,
1037                                         log);
1038                 if (IS_ERR(acts)) {
1039                         error = PTR_ERR(acts);
1040                         goto error;
1041                 }
1042
1043                 /* Can allocate before locking if have acts. */
1044                 reply = ovs_flow_cmd_alloc_info(acts, info, false);
1045                 if (IS_ERR(reply)) {
1046                         error = PTR_ERR(reply);
1047                         goto err_kfree_acts;
1048                 }
1049         }
1050
1051         ovs_lock();
1052         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1053         if (unlikely(!dp)) {
1054                 error = -ENODEV;
1055                 goto err_unlock_ovs;
1056         }
1057         /* Check that the flow exists. */
1058         flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1059         if (unlikely(!flow)) {
1060                 error = -ENOENT;
1061                 goto err_unlock_ovs;
1062         }
1063
1064         /* Update actions, if present. */
1065         if (likely(acts)) {
1066                 old_acts = ovsl_dereference(flow->sf_acts);
1067                 rcu_assign_pointer(flow->sf_acts, acts);
1068
1069                 if (unlikely(reply)) {
1070                         error = ovs_flow_cmd_fill_info(flow,
1071                                                        ovs_header->dp_ifindex,
1072                                                        reply, info->snd_portid,
1073                                                        info->snd_seq, 0,
1074                                                        OVS_FLOW_CMD_NEW);
1075                         BUG_ON(error < 0);
1076                 }
1077         } else {
1078                 /* Could not alloc without acts before locking. */
1079                 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1080                                                 info, OVS_FLOW_CMD_NEW, false);
1081                 if (unlikely(IS_ERR(reply))) {
1082                         error = PTR_ERR(reply);
1083                         goto err_unlock_ovs;
1084                 }
1085         }
1086
1087         /* Clear stats. */
1088         if (a[OVS_FLOW_ATTR_CLEAR])
1089                 ovs_flow_stats_clear(flow);
1090         ovs_unlock();
1091
1092         if (reply)
1093                 ovs_notify(&dp_flow_genl_family, reply, info);
1094         if (old_acts)
1095                 ovs_nla_free_flow_actions(old_acts);
1096
1097         return 0;
1098
1099 err_unlock_ovs:
1100         ovs_unlock();
1101         kfree_skb(reply);
1102 err_kfree_acts:
1103         kfree(acts);
1104 error:
1105         return error;
1106 }
1107
1108 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1109 {
1110         struct nlattr **a = info->attrs;
1111         struct ovs_header *ovs_header = info->userhdr;
1112         struct sw_flow_key key;
1113         struct sk_buff *reply;
1114         struct sw_flow *flow;
1115         struct datapath *dp;
1116         struct sw_flow_match match;
1117         int err;
1118         bool log = !a[OVS_FLOW_ATTR_PROBE];
1119
1120         if (!a[OVS_FLOW_ATTR_KEY]) {
1121                 OVS_NLERR(log,
1122                           "Flow get message rejected, Key attribute missing.");
1123                 return -EINVAL;
1124         }
1125
1126         ovs_match_init(&match, &key, NULL);
1127         err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL, log);
1128         if (err)
1129                 return err;
1130
1131         ovs_lock();
1132         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1133         if (!dp) {
1134                 err = -ENODEV;
1135                 goto unlock;
1136         }
1137
1138         flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1139         if (!flow) {
1140                 err = -ENOENT;
1141                 goto unlock;
1142         }
1143
1144         reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1145                                         OVS_FLOW_CMD_NEW, true);
1146         if (IS_ERR(reply)) {
1147                 err = PTR_ERR(reply);
1148                 goto unlock;
1149         }
1150
1151         ovs_unlock();
1152         return genlmsg_reply(reply, info);
1153 unlock:
1154         ovs_unlock();
1155         return err;
1156 }
1157
1158 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1159 {
1160         struct nlattr **a = info->attrs;
1161         struct ovs_header *ovs_header = info->userhdr;
1162         struct sw_flow_key key;
1163         struct sk_buff *reply;
1164         struct sw_flow *flow;
1165         struct datapath *dp;
1166         struct sw_flow_match match;
1167         int err;
1168         bool log = !a[OVS_FLOW_ATTR_PROBE];
1169
1170         if (likely(a[OVS_FLOW_ATTR_KEY])) {
1171                 ovs_match_init(&match, &key, NULL);
1172                 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL,
1173                                         log);
1174                 if (unlikely(err))
1175                         return err;
1176         }
1177
1178         ovs_lock();
1179         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1180         if (unlikely(!dp)) {
1181                 err = -ENODEV;
1182                 goto unlock;
1183         }
1184
1185         if (unlikely(!a[OVS_FLOW_ATTR_KEY])) {
1186                 err = ovs_flow_tbl_flush(&dp->table);
1187                 goto unlock;
1188         }
1189
1190         flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1191         if (unlikely(!flow)) {
1192                 err = -ENOENT;
1193                 goto unlock;
1194         }
1195
1196         ovs_flow_tbl_remove(&dp->table, flow);
1197         ovs_unlock();
1198
1199         reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1200                                         info, false);
1201         if (likely(reply)) {
1202                 if (likely(!IS_ERR(reply))) {
1203                         rcu_read_lock();        /*To keep RCU checker happy. */
1204                         err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1205                                                      reply, info->snd_portid,
1206                                                      info->snd_seq, 0,
1207                                                      OVS_FLOW_CMD_DEL);
1208                         rcu_read_unlock();
1209                         BUG_ON(err < 0);
1210
1211                         ovs_notify(&dp_flow_genl_family, reply, info);
1212                 } else {
1213                         netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1214                 }
1215         }
1216
1217         ovs_flow_free(flow, true);
1218         return 0;
1219 unlock:
1220         ovs_unlock();
1221         return err;
1222 }
1223
1224 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1225 {
1226         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1227         struct table_instance *ti;
1228         struct datapath *dp;
1229
1230         rcu_read_lock();
1231         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1232         if (!dp) {
1233                 rcu_read_unlock();
1234                 return -ENODEV;
1235         }
1236
1237         ti = rcu_dereference(dp->table.ti);
1238         for (;;) {
1239                 struct sw_flow *flow;
1240                 u32 bucket, obj;
1241
1242                 bucket = cb->args[0];
1243                 obj = cb->args[1];
1244                 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1245                 if (!flow)
1246                         break;
1247
1248                 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1249                                            NETLINK_CB(cb->skb).portid,
1250                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1251                                            OVS_FLOW_CMD_NEW) < 0)
1252                         break;
1253
1254                 cb->args[0] = bucket;
1255                 cb->args[1] = obj;
1256         }
1257         rcu_read_unlock();
1258         return skb->len;
1259 }
1260
1261 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1262         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1263         [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1264         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1265         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1266         [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1267 };
1268
1269 static const struct genl_ops dp_flow_genl_ops[] = {
1270         { .cmd = OVS_FLOW_CMD_NEW,
1271           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1272           .policy = flow_policy,
1273           .doit = ovs_flow_cmd_new
1274         },
1275         { .cmd = OVS_FLOW_CMD_DEL,
1276           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1277           .policy = flow_policy,
1278           .doit = ovs_flow_cmd_del
1279         },
1280         { .cmd = OVS_FLOW_CMD_GET,
1281           .flags = 0,               /* OK for unprivileged users. */
1282           .policy = flow_policy,
1283           .doit = ovs_flow_cmd_get,
1284           .dumpit = ovs_flow_cmd_dump
1285         },
1286         { .cmd = OVS_FLOW_CMD_SET,
1287           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1288           .policy = flow_policy,
1289           .doit = ovs_flow_cmd_set,
1290         },
1291 };
1292
1293 static struct genl_family dp_flow_genl_family = {
1294         .id = GENL_ID_GENERATE,
1295         .hdrsize = sizeof(struct ovs_header),
1296         .name = OVS_FLOW_FAMILY,
1297         .version = OVS_FLOW_VERSION,
1298         .maxattr = OVS_FLOW_ATTR_MAX,
1299         .netnsok = true,
1300         .parallel_ops = true,
1301         .ops = dp_flow_genl_ops,
1302         .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1303         .mcgrps = &ovs_dp_flow_multicast_group,
1304         .n_mcgrps = 1,
1305 };
1306
1307 static size_t ovs_dp_cmd_msg_size(void)
1308 {
1309         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1310
1311         msgsize += nla_total_size(IFNAMSIZ);
1312         msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1313         msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1314         msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1315
1316         return msgsize;
1317 }
1318
1319 /* Called with ovs_mutex. */
1320 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1321                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1322 {
1323         struct ovs_header *ovs_header;
1324         struct ovs_dp_stats dp_stats;
1325         struct ovs_dp_megaflow_stats dp_megaflow_stats;
1326         int err;
1327
1328         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1329                                    flags, cmd);
1330         if (!ovs_header)
1331                 goto error;
1332
1333         ovs_header->dp_ifindex = get_dpifindex(dp);
1334
1335         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1336         if (err)
1337                 goto nla_put_failure;
1338
1339         get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1340         if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1341                         &dp_stats))
1342                 goto nla_put_failure;
1343
1344         if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1345                         sizeof(struct ovs_dp_megaflow_stats),
1346                         &dp_megaflow_stats))
1347                 goto nla_put_failure;
1348
1349         if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1350                 goto nla_put_failure;
1351
1352         return genlmsg_end(skb, ovs_header);
1353
1354 nla_put_failure:
1355         genlmsg_cancel(skb, ovs_header);
1356 error:
1357         return -EMSGSIZE;
1358 }
1359
1360 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1361 {
1362         return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1363 }
1364
1365 /* Called with rcu_read_lock or ovs_mutex. */
1366 static struct datapath *lookup_datapath(struct net *net,
1367                                         const struct ovs_header *ovs_header,
1368                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1369 {
1370         struct datapath *dp;
1371
1372         if (!a[OVS_DP_ATTR_NAME])
1373                 dp = get_dp(net, ovs_header->dp_ifindex);
1374         else {
1375                 struct vport *vport;
1376
1377                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1378                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1379         }
1380         return dp ? dp : ERR_PTR(-ENODEV);
1381 }
1382
1383 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1384 {
1385         struct datapath *dp;
1386
1387         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1388         if (IS_ERR(dp))
1389                 return;
1390
1391         WARN(dp->user_features, "Dropping previously announced user features\n");
1392         dp->user_features = 0;
1393 }
1394
1395 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1396 {
1397         if (a[OVS_DP_ATTR_USER_FEATURES])
1398                 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1399 }
1400
1401 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1402 {
1403         struct nlattr **a = info->attrs;
1404         struct vport_parms parms;
1405         struct sk_buff *reply;
1406         struct datapath *dp;
1407         struct vport *vport;
1408         struct ovs_net *ovs_net;
1409         int err, i;
1410
1411         err = -EINVAL;
1412         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1413                 goto err;
1414
1415         reply = ovs_dp_cmd_alloc_info(info);
1416         if (!reply)
1417                 return -ENOMEM;
1418
1419         err = -ENOMEM;
1420         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1421         if (dp == NULL)
1422                 goto err_free_reply;
1423
1424         ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1425
1426         /* Allocate table. */
1427         err = ovs_flow_tbl_init(&dp->table);
1428         if (err)
1429                 goto err_free_dp;
1430
1431         dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1432         if (!dp->stats_percpu) {
1433                 err = -ENOMEM;
1434                 goto err_destroy_table;
1435         }
1436
1437         dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1438                             GFP_KERNEL);
1439         if (!dp->ports) {
1440                 err = -ENOMEM;
1441                 goto err_destroy_percpu;
1442         }
1443
1444         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1445                 INIT_HLIST_HEAD(&dp->ports[i]);
1446
1447         /* Set up our datapath device. */
1448         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1449         parms.type = OVS_VPORT_TYPE_INTERNAL;
1450         parms.options = NULL;
1451         parms.dp = dp;
1452         parms.port_no = OVSP_LOCAL;
1453         parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1454
1455         ovs_dp_change(dp, a);
1456
1457         /* So far only local changes have been made, now need the lock. */
1458         ovs_lock();
1459
1460         vport = new_vport(&parms);
1461         if (IS_ERR(vport)) {
1462                 err = PTR_ERR(vport);
1463                 if (err == -EBUSY)
1464                         err = -EEXIST;
1465
1466                 if (err == -EEXIST) {
1467                         /* An outdated user space instance that does not understand
1468                          * the concept of user_features has attempted to create a new
1469                          * datapath and is likely to reuse it. Drop all user features.
1470                          */
1471                         if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1472                                 ovs_dp_reset_user_features(skb, info);
1473                 }
1474
1475                 goto err_destroy_ports_array;
1476         }
1477
1478         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1479                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1480         BUG_ON(err < 0);
1481
1482         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1483         list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1484
1485         ovs_unlock();
1486
1487         ovs_notify(&dp_datapath_genl_family, reply, info);
1488         return 0;
1489
1490 err_destroy_ports_array:
1491         ovs_unlock();
1492         kfree(dp->ports);
1493 err_destroy_percpu:
1494         free_percpu(dp->stats_percpu);
1495 err_destroy_table:
1496         ovs_flow_tbl_destroy(&dp->table);
1497 err_free_dp:
1498         release_net(ovs_dp_get_net(dp));
1499         kfree(dp);
1500 err_free_reply:
1501         kfree_skb(reply);
1502 err:
1503         return err;
1504 }
1505
1506 /* Called with ovs_mutex. */
1507 static void __dp_destroy(struct datapath *dp)
1508 {
1509         int i;
1510
1511         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1512                 struct vport *vport;
1513                 struct hlist_node *n;
1514
1515                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1516                         if (vport->port_no != OVSP_LOCAL)
1517                                 ovs_dp_detach_port(vport);
1518         }
1519
1520         list_del_rcu(&dp->list_node);
1521
1522         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1523          * all ports in datapath are destroyed first before freeing datapath.
1524          */
1525         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1526
1527         /* RCU destroy the flow table */
1528         call_rcu(&dp->rcu, destroy_dp_rcu);
1529 }
1530
1531 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1532 {
1533         struct sk_buff *reply;
1534         struct datapath *dp;
1535         int err;
1536
1537         reply = ovs_dp_cmd_alloc_info(info);
1538         if (!reply)
1539                 return -ENOMEM;
1540
1541         ovs_lock();
1542         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1543         err = PTR_ERR(dp);
1544         if (IS_ERR(dp))
1545                 goto err_unlock_free;
1546
1547         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1548                                    info->snd_seq, 0, OVS_DP_CMD_DEL);
1549         BUG_ON(err < 0);
1550
1551         __dp_destroy(dp);
1552         ovs_unlock();
1553
1554         ovs_notify(&dp_datapath_genl_family, reply, info);
1555
1556         return 0;
1557
1558 err_unlock_free:
1559         ovs_unlock();
1560         kfree_skb(reply);
1561         return err;
1562 }
1563
1564 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1565 {
1566         struct sk_buff *reply;
1567         struct datapath *dp;
1568         int err;
1569
1570         reply = ovs_dp_cmd_alloc_info(info);
1571         if (!reply)
1572                 return -ENOMEM;
1573
1574         ovs_lock();
1575         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1576         err = PTR_ERR(dp);
1577         if (IS_ERR(dp))
1578                 goto err_unlock_free;
1579
1580         ovs_dp_change(dp, info->attrs);
1581
1582         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1583                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1584         BUG_ON(err < 0);
1585
1586         ovs_unlock();
1587         ovs_notify(&dp_datapath_genl_family, reply, info);
1588
1589         return 0;
1590
1591 err_unlock_free:
1592         ovs_unlock();
1593         kfree_skb(reply);
1594         return err;
1595 }
1596
1597 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1598 {
1599         struct sk_buff *reply;
1600         struct datapath *dp;
1601         int err;
1602
1603         reply = ovs_dp_cmd_alloc_info(info);
1604         if (!reply)
1605                 return -ENOMEM;
1606
1607         ovs_lock();
1608         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1609         if (IS_ERR(dp)) {
1610                 err = PTR_ERR(dp);
1611                 goto err_unlock_free;
1612         }
1613         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1614                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1615         BUG_ON(err < 0);
1616         ovs_unlock();
1617
1618         return genlmsg_reply(reply, info);
1619
1620 err_unlock_free:
1621         ovs_unlock();
1622         kfree_skb(reply);
1623         return err;
1624 }
1625
1626 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1627 {
1628         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1629         struct datapath *dp;
1630         int skip = cb->args[0];
1631         int i = 0;
1632
1633         ovs_lock();
1634         list_for_each_entry(dp, &ovs_net->dps, list_node) {
1635                 if (i >= skip &&
1636                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1637                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1638                                          OVS_DP_CMD_NEW) < 0)
1639                         break;
1640                 i++;
1641         }
1642         ovs_unlock();
1643
1644         cb->args[0] = i;
1645
1646         return skb->len;
1647 }
1648
1649 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1650         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1651         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1652         [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1653 };
1654
1655 static const struct genl_ops dp_datapath_genl_ops[] = {
1656         { .cmd = OVS_DP_CMD_NEW,
1657           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1658           .policy = datapath_policy,
1659           .doit = ovs_dp_cmd_new
1660         },
1661         { .cmd = OVS_DP_CMD_DEL,
1662           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1663           .policy = datapath_policy,
1664           .doit = ovs_dp_cmd_del
1665         },
1666         { .cmd = OVS_DP_CMD_GET,
1667           .flags = 0,               /* OK for unprivileged users. */
1668           .policy = datapath_policy,
1669           .doit = ovs_dp_cmd_get,
1670           .dumpit = ovs_dp_cmd_dump
1671         },
1672         { .cmd = OVS_DP_CMD_SET,
1673           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1674           .policy = datapath_policy,
1675           .doit = ovs_dp_cmd_set,
1676         },
1677 };
1678
1679 static struct genl_family dp_datapath_genl_family = {
1680         .id = GENL_ID_GENERATE,
1681         .hdrsize = sizeof(struct ovs_header),
1682         .name = OVS_DATAPATH_FAMILY,
1683         .version = OVS_DATAPATH_VERSION,
1684         .maxattr = OVS_DP_ATTR_MAX,
1685         .netnsok = true,
1686         .parallel_ops = true,
1687         .ops = dp_datapath_genl_ops,
1688         .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1689         .mcgrps = &ovs_dp_datapath_multicast_group,
1690         .n_mcgrps = 1,
1691 };
1692
1693 /* Called with ovs_mutex or RCU read lock. */
1694 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1695                                    u32 portid, u32 seq, u32 flags, u8 cmd)
1696 {
1697         struct ovs_header *ovs_header;
1698         struct ovs_vport_stats vport_stats;
1699         int err;
1700
1701         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1702                                  flags, cmd);
1703         if (!ovs_header)
1704                 return -EMSGSIZE;
1705
1706         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1707
1708         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1709             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1710             nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1711                            vport->ops->get_name(vport)))
1712                 goto nla_put_failure;
1713
1714         ovs_vport_get_stats(vport, &vport_stats);
1715         if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1716                     &vport_stats))
1717                 goto nla_put_failure;
1718
1719         if (ovs_vport_get_upcall_portids(vport, skb))
1720                 goto nla_put_failure;
1721
1722         err = ovs_vport_get_options(vport, skb);
1723         if (err == -EMSGSIZE)
1724                 goto error;
1725
1726         return genlmsg_end(skb, ovs_header);
1727
1728 nla_put_failure:
1729         err = -EMSGSIZE;
1730 error:
1731         genlmsg_cancel(skb, ovs_header);
1732         return err;
1733 }
1734
1735 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1736 {
1737         return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1738 }
1739
1740 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1741 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1742                                          u32 seq, u8 cmd)
1743 {
1744         struct sk_buff *skb;
1745         int retval;
1746
1747         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1748         if (!skb)
1749                 return ERR_PTR(-ENOMEM);
1750
1751         retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1752         BUG_ON(retval < 0);
1753
1754         return skb;
1755 }
1756
1757 /* Called with ovs_mutex or RCU read lock. */
1758 static struct vport *lookup_vport(struct net *net,
1759                                   const struct ovs_header *ovs_header,
1760                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1761 {
1762         struct datapath *dp;
1763         struct vport *vport;
1764
1765         if (a[OVS_VPORT_ATTR_NAME]) {
1766                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1767                 if (!vport)
1768                         return ERR_PTR(-ENODEV);
1769                 if (ovs_header->dp_ifindex &&
1770                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1771                         return ERR_PTR(-ENODEV);
1772                 return vport;
1773         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1774                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1775
1776                 if (port_no >= DP_MAX_PORTS)
1777                         return ERR_PTR(-EFBIG);
1778
1779                 dp = get_dp(net, ovs_header->dp_ifindex);
1780                 if (!dp)
1781                         return ERR_PTR(-ENODEV);
1782
1783                 vport = ovs_vport_ovsl_rcu(dp, port_no);
1784                 if (!vport)
1785                         return ERR_PTR(-ENODEV);
1786                 return vport;
1787         } else
1788                 return ERR_PTR(-EINVAL);
1789 }
1790
1791 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1792 {
1793         struct nlattr **a = info->attrs;
1794         struct ovs_header *ovs_header = info->userhdr;
1795         struct vport_parms parms;
1796         struct sk_buff *reply;
1797         struct vport *vport;
1798         struct datapath *dp;
1799         u32 port_no;
1800         int err;
1801
1802         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1803             !a[OVS_VPORT_ATTR_UPCALL_PID])
1804                 return -EINVAL;
1805
1806         port_no = a[OVS_VPORT_ATTR_PORT_NO]
1807                 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1808         if (port_no >= DP_MAX_PORTS)
1809                 return -EFBIG;
1810
1811         reply = ovs_vport_cmd_alloc_info();
1812         if (!reply)
1813                 return -ENOMEM;
1814
1815         ovs_lock();
1816 restart:
1817         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1818         err = -ENODEV;
1819         if (!dp)
1820                 goto exit_unlock_free;
1821
1822         if (port_no) {
1823                 vport = ovs_vport_ovsl(dp, port_no);
1824                 err = -EBUSY;
1825                 if (vport)
1826                         goto exit_unlock_free;
1827         } else {
1828                 for (port_no = 1; ; port_no++) {
1829                         if (port_no >= DP_MAX_PORTS) {
1830                                 err = -EFBIG;
1831                                 goto exit_unlock_free;
1832                         }
1833                         vport = ovs_vport_ovsl(dp, port_no);
1834                         if (!vport)
1835                                 break;
1836                 }
1837         }
1838
1839         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1840         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1841         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1842         parms.dp = dp;
1843         parms.port_no = port_no;
1844         parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1845
1846         vport = new_vport(&parms);
1847         err = PTR_ERR(vport);
1848         if (IS_ERR(vport)) {
1849                 if (err == -EAGAIN)
1850                         goto restart;
1851                 goto exit_unlock_free;
1852         }
1853
1854         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1855                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1856         BUG_ON(err < 0);
1857         ovs_unlock();
1858
1859         ovs_notify(&dp_vport_genl_family, reply, info);
1860         return 0;
1861
1862 exit_unlock_free:
1863         ovs_unlock();
1864         kfree_skb(reply);
1865         return err;
1866 }
1867
1868 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1869 {
1870         struct nlattr **a = info->attrs;
1871         struct sk_buff *reply;
1872         struct vport *vport;
1873         int err;
1874
1875         reply = ovs_vport_cmd_alloc_info();
1876         if (!reply)
1877                 return -ENOMEM;
1878
1879         ovs_lock();
1880         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1881         err = PTR_ERR(vport);
1882         if (IS_ERR(vport))
1883                 goto exit_unlock_free;
1884
1885         if (a[OVS_VPORT_ATTR_TYPE] &&
1886             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1887                 err = -EINVAL;
1888                 goto exit_unlock_free;
1889         }
1890
1891         if (a[OVS_VPORT_ATTR_OPTIONS]) {
1892                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1893                 if (err)
1894                         goto exit_unlock_free;
1895         }
1896
1897
1898         if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
1899                 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
1900
1901                 err = ovs_vport_set_upcall_portids(vport, ids);
1902                 if (err)
1903                         goto exit_unlock_free;
1904         }
1905
1906         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1907                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1908         BUG_ON(err < 0);
1909
1910         ovs_unlock();
1911         ovs_notify(&dp_vport_genl_family, reply, info);
1912         return 0;
1913
1914 exit_unlock_free:
1915         ovs_unlock();
1916         kfree_skb(reply);
1917         return err;
1918 }
1919
1920 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1921 {
1922         struct nlattr **a = info->attrs;
1923         struct sk_buff *reply;
1924         struct vport *vport;
1925         int err;
1926
1927         reply = ovs_vport_cmd_alloc_info();
1928         if (!reply)
1929                 return -ENOMEM;
1930
1931         ovs_lock();
1932         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1933         err = PTR_ERR(vport);
1934         if (IS_ERR(vport))
1935                 goto exit_unlock_free;
1936
1937         if (vport->port_no == OVSP_LOCAL) {
1938                 err = -EINVAL;
1939                 goto exit_unlock_free;
1940         }
1941
1942         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1943                                       info->snd_seq, 0, OVS_VPORT_CMD_DEL);
1944         BUG_ON(err < 0);
1945         ovs_dp_detach_port(vport);
1946         ovs_unlock();
1947
1948         ovs_notify(&dp_vport_genl_family, reply, info);
1949         return 0;
1950
1951 exit_unlock_free:
1952         ovs_unlock();
1953         kfree_skb(reply);
1954         return err;
1955 }
1956
1957 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1958 {
1959         struct nlattr **a = info->attrs;
1960         struct ovs_header *ovs_header = info->userhdr;
1961         struct sk_buff *reply;
1962         struct vport *vport;
1963         int err;
1964
1965         reply = ovs_vport_cmd_alloc_info();
1966         if (!reply)
1967                 return -ENOMEM;
1968
1969         rcu_read_lock();
1970         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1971         err = PTR_ERR(vport);
1972         if (IS_ERR(vport))
1973                 goto exit_unlock_free;
1974         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1975                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1976         BUG_ON(err < 0);
1977         rcu_read_unlock();
1978
1979         return genlmsg_reply(reply, info);
1980
1981 exit_unlock_free:
1982         rcu_read_unlock();
1983         kfree_skb(reply);
1984         return err;
1985 }
1986
1987 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1988 {
1989         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1990         struct datapath *dp;
1991         int bucket = cb->args[0], skip = cb->args[1];
1992         int i, j = 0;
1993
1994         rcu_read_lock();
1995         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1996         if (!dp) {
1997                 rcu_read_unlock();
1998                 return -ENODEV;
1999         }
2000         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2001                 struct vport *vport;
2002
2003                 j = 0;
2004                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2005                         if (j >= skip &&
2006                             ovs_vport_cmd_fill_info(vport, skb,
2007                                                     NETLINK_CB(cb->skb).portid,
2008                                                     cb->nlh->nlmsg_seq,
2009                                                     NLM_F_MULTI,
2010                                                     OVS_VPORT_CMD_NEW) < 0)
2011                                 goto out;
2012
2013                         j++;
2014                 }
2015                 skip = 0;
2016         }
2017 out:
2018         rcu_read_unlock();
2019
2020         cb->args[0] = i;
2021         cb->args[1] = j;
2022
2023         return skb->len;
2024 }
2025
2026 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2027         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2028         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2029         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2030         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2031         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2032         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2033 };
2034
2035 static const struct genl_ops dp_vport_genl_ops[] = {
2036         { .cmd = OVS_VPORT_CMD_NEW,
2037           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2038           .policy = vport_policy,
2039           .doit = ovs_vport_cmd_new
2040         },
2041         { .cmd = OVS_VPORT_CMD_DEL,
2042           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2043           .policy = vport_policy,
2044           .doit = ovs_vport_cmd_del
2045         },
2046         { .cmd = OVS_VPORT_CMD_GET,
2047           .flags = 0,               /* OK for unprivileged users. */
2048           .policy = vport_policy,
2049           .doit = ovs_vport_cmd_get,
2050           .dumpit = ovs_vport_cmd_dump
2051         },
2052         { .cmd = OVS_VPORT_CMD_SET,
2053           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2054           .policy = vport_policy,
2055           .doit = ovs_vport_cmd_set,
2056         },
2057 };
2058
2059 struct genl_family dp_vport_genl_family = {
2060         .id = GENL_ID_GENERATE,
2061         .hdrsize = sizeof(struct ovs_header),
2062         .name = OVS_VPORT_FAMILY,
2063         .version = OVS_VPORT_VERSION,
2064         .maxattr = OVS_VPORT_ATTR_MAX,
2065         .netnsok = true,
2066         .parallel_ops = true,
2067         .ops = dp_vport_genl_ops,
2068         .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2069         .mcgrps = &ovs_dp_vport_multicast_group,
2070         .n_mcgrps = 1,
2071 };
2072
2073 static struct genl_family * const dp_genl_families[] = {
2074         &dp_datapath_genl_family,
2075         &dp_vport_genl_family,
2076         &dp_flow_genl_family,
2077         &dp_packet_genl_family,
2078 };
2079
2080 static void dp_unregister_genl(int n_families)
2081 {
2082         int i;
2083
2084         for (i = 0; i < n_families; i++)
2085                 genl_unregister_family(dp_genl_families[i]);
2086 }
2087
2088 static int dp_register_genl(void)
2089 {
2090         int err;
2091         int i;
2092
2093         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2094
2095                 err = genl_register_family(dp_genl_families[i]);
2096                 if (err)
2097                         goto error;
2098         }
2099
2100         return 0;
2101
2102 error:
2103         dp_unregister_genl(i);
2104         return err;
2105 }
2106
2107 static int __net_init ovs_init_net(struct net *net)
2108 {
2109         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2110
2111         INIT_LIST_HEAD(&ovs_net->dps);
2112         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2113         return 0;
2114 }
2115
2116 static void __net_exit ovs_exit_net(struct net *net)
2117 {
2118         struct datapath *dp, *dp_next;
2119         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2120
2121         ovs_lock();
2122         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2123                 __dp_destroy(dp);
2124         ovs_unlock();
2125
2126         cancel_work_sync(&ovs_net->dp_notify_work);
2127 }
2128
2129 static struct pernet_operations ovs_net_ops = {
2130         .init = ovs_init_net,
2131         .exit = ovs_exit_net,
2132         .id   = &ovs_net_id,
2133         .size = sizeof(struct ovs_net),
2134 };
2135
2136 static int __init dp_init(void)
2137 {
2138         int err;
2139
2140         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2141
2142         pr_info("Open vSwitch switching datapath\n");
2143
2144         err = action_fifos_init();
2145         if (err)
2146                 goto error;
2147
2148         err = ovs_internal_dev_rtnl_link_register();
2149         if (err)
2150                 goto error_action_fifos_exit;
2151
2152         err = ovs_flow_init();
2153         if (err)
2154                 goto error_unreg_rtnl_link;
2155
2156         err = ovs_vport_init();
2157         if (err)
2158                 goto error_flow_exit;
2159
2160         err = register_pernet_device(&ovs_net_ops);
2161         if (err)
2162                 goto error_vport_exit;
2163
2164         err = register_netdevice_notifier(&ovs_dp_device_notifier);
2165         if (err)
2166                 goto error_netns_exit;
2167
2168         err = ovs_netdev_init();
2169         if (err)
2170                 goto error_unreg_notifier;
2171
2172         err = dp_register_genl();
2173         if (err < 0)
2174                 goto error_unreg_netdev;
2175
2176         return 0;
2177
2178 error_unreg_netdev:
2179         ovs_netdev_exit();
2180 error_unreg_notifier:
2181         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2182 error_netns_exit:
2183         unregister_pernet_device(&ovs_net_ops);
2184 error_vport_exit:
2185         ovs_vport_exit();
2186 error_flow_exit:
2187         ovs_flow_exit();
2188 error_unreg_rtnl_link:
2189         ovs_internal_dev_rtnl_link_unregister();
2190 error_action_fifos_exit:
2191         action_fifos_exit();
2192 error:
2193         return err;
2194 }
2195
2196 static void dp_cleanup(void)
2197 {
2198         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2199         ovs_netdev_exit();
2200         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2201         unregister_pernet_device(&ovs_net_ops);
2202         rcu_barrier();
2203         ovs_vport_exit();
2204         ovs_flow_exit();
2205         ovs_internal_dev_rtnl_link_unregister();
2206         action_fifos_exit();
2207 }
2208
2209 module_init(dp_init);
2210 module_exit(dp_cleanup);
2211
2212 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2213 MODULE_LICENSE("GPL");