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 "meter.h"
  59 #include "vport-internal_dev.h"
  60 #include "vport-netdev.h"
  61
  62 unsigned int ovs_net_id __read_mostly;
  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 nla_policy flow_policy[];
  69
  70 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
  71         .name = OVS_FLOW_MCGROUP,
  72 };
  73
  74 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
  75         .name = OVS_DATAPATH_MCGROUP,
  76 };
  77
  78 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
  79         .name = OVS_VPORT_MCGROUP,
  80 };
  81
  82 /* Check if need to build a reply message.
  83  * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
  84 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
  85                             unsigned int group)
  86 {
  87         return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
  88                genl_has_listeners(family, genl_info_net(info), group);
  89 }
  90
  91 static void ovs_notify(struct genl_family *family,
  92                        struct sk_buff *skb, struct genl_info *info)
  93 {
  94         genl_notify(family, skb, info, 0, 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 #endif
 135
 136 static struct vport *new_vport(const struct vport_parms *);
 137 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
 138                              const struct sw_flow_key *,
 139                              const struct dp_upcall_info *,
 140                              uint32_t cutlen);
 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                                   uint32_t cutlen);
 145
 146 /* Must be called with rcu_read_lock or ovs_mutex. */
 147 const char *ovs_dp_name(const struct datapath *dp)
 148 {
 149         struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
 150         return ovs_vport_name(vport);
 151 }
 152
 153 static int get_dpifindex(const struct datapath *dp)
 154 {
 155         struct vport *local;
 156         int ifindex;
 157
 158         rcu_read_lock();
 159
 160         local = ovs_vport_rcu(dp, OVSP_LOCAL);
 161         if (local)
 162                 ifindex = local->dev->ifindex;
 163         else
 164                 ifindex = 0;
 165
 166         rcu_read_unlock();
 167
 168         return ifindex;
 169 }
 170
 171 static void destroy_dp_rcu(struct rcu_head *rcu)
 172 {
 173         struct datapath *dp = container_of(rcu, struct datapath, rcu);
 174
 175         ovs_flow_tbl_destroy(&dp->table);
 176         free_percpu(dp->stats_percpu);
 177         kfree(dp->ports);
 178         ovs_meters_exit(dp);
 179         kfree(dp);
 180 }
 181
 182 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
 183                                             u16 port_no)
 184 {
 185         return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
 186 }
 187
 188 /* Called with ovs_mutex or RCU read lock. */
 189 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
 190 {
 191         struct vport *vport;
 192         struct hlist_head *head;
 193
 194         head = vport_hash_bucket(dp, port_no);
 195         hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
 196                 if (vport->port_no == port_no)
 197                         return vport;
 198         }
 199         return NULL;
 200 }
 201
 202 /* Called with ovs_mutex. */
 203 static struct vport *new_vport(const struct vport_parms *parms)
 204 {
 205         struct vport *vport;
 206
 207         vport = ovs_vport_add(parms);
 208         if (!IS_ERR(vport)) {
 209                 struct datapath *dp = parms->dp;
 210                 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
 211
 212                 hlist_add_head_rcu(&vport->dp_hash_node, head);
 213         }
 214         return vport;
 215 }
 216
 217 void ovs_dp_detach_port(struct vport *p)
 218 {
 219         ASSERT_OVSL();
 220
 221         /* First drop references to device. */
 222         hlist_del_rcu(&p->dp_hash_node);
 223
 224         /* Then destroy it. */
 225         ovs_vport_del(p);
 226 }
 227
 228 /* Must be called with rcu_read_lock. */
 229 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
 230 {
 231         const struct vport *p = OVS_CB(skb)->input_vport;
 232         struct datapath *dp = p->dp;
 233         struct sw_flow *flow;
 234         struct sw_flow_actions *sf_acts;
 235         struct dp_stats_percpu *stats;
 236         u64 *stats_counter;
 237         u32 n_mask_hit;
 238
 239         stats = this_cpu_ptr(dp->stats_percpu);
 240
 241         /* Look up flow. */
 242         flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
 243         if (unlikely(!flow)) {
 244                 struct dp_upcall_info upcall;
 245                 int error;
 246
 247                 memset(&upcall, 0, sizeof(upcall));
 248                 upcall.cmd = OVS_PACKET_CMD_MISS;
 249                 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
 250                 upcall.mru = OVS_CB(skb)->mru;
 251                 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
 252                 if (unlikely(error))
 253                         kfree_skb(skb);
 254                 else
 255                         consume_skb(skb);
 256                 stats_counter = &stats->n_missed;
 257                 goto out;
 258         }
 259
 260         ovs_flow_stats_update(flow, key->tp.flags, skb);
 261         sf_acts = rcu_dereference(flow->sf_acts);
 262         ovs_execute_actions(dp, skb, sf_acts, key);
 263
 264         stats_counter = &stats->n_hit;
 265
 266 out:
 267         /* Update datapath statistics. */
 268         u64_stats_update_begin(&stats->syncp);
 269         (*stats_counter)++;
 270         stats->n_mask_hit += n_mask_hit;
 271         u64_stats_update_end(&stats->syncp);
 272 }
 273
 274 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
 275                   const struct sw_flow_key *key,
 276                   const struct dp_upcall_info *upcall_info,
 277                   uint32_t cutlen)
 278 {
 279         struct dp_stats_percpu *stats;
 280         int err;
 281
 282         if (upcall_info->portid == 0) {
 283                 err = -ENOTCONN;
 284                 goto err;
 285         }
 286
 287         if (!skb_is_gso(skb))
 288                 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
 289         else
 290                 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
 291         if (err)
 292                 goto err;
 293
 294         return 0;
 295
 296 err:
 297         stats = this_cpu_ptr(dp->stats_percpu);
 298
 299         u64_stats_update_begin(&stats->syncp);
 300         stats->n_lost++;
 301         u64_stats_update_end(&stats->syncp);
 302
 303         return err;
 304 }
 305
 306 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
 307                              const struct sw_flow_key *key,
 308                              const struct dp_upcall_info *upcall_info,
 309                                  uint32_t cutlen)
 310 {
 311         unsigned int gso_type = skb_shinfo(skb)->gso_type;
 312         struct sw_flow_key later_key;
 313         struct sk_buff *segs, *nskb;
 314         int err;
 315
 316         BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET);
 317         segs = __skb_gso_segment(skb, NETIF_F_SG, false);
 318         if (IS_ERR(segs))
 319                 return PTR_ERR(segs);
 320         if (segs == NULL)
 321                 return -EINVAL;
 322
 323         if (gso_type & SKB_GSO_UDP) {
 324                 /* The initial flow key extracted by ovs_flow_key_extract()
 325                  * in this case is for a first fragment, so we need to
 326                  * properly mark later fragments.
 327                  */
 328                 later_key = *key;
 329                 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
 330         }
 331
 332         /* Queue all of the segments. */
 333         skb = segs;
 334         do {
 335                 if (gso_type & SKB_GSO_UDP && skb != segs)
 336                         key = &later_key;
 337
 338                 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
 339                 if (err)
 340                         break;
 341
 342         } while ((skb = skb->next));
 343
 344         /* Free all of the segments. */
 345         skb = segs;
 346         do {
 347                 nskb = skb->next;
 348                 if (err)
 349                         kfree_skb(skb);
 350                 else
 351                         consume_skb(skb);
 352         } while ((skb = nskb));
 353         return err;
 354 }
 355
 356 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
 357                               unsigned int hdrlen, int actions_attrlen)
 358 {
 359         size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
 360                 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
 361                 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
 362                 + nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */
 363
 364         /* OVS_PACKET_ATTR_USERDATA */
 365         if (upcall_info->userdata)
 366                 size += NLA_ALIGN(upcall_info->userdata->nla_len);
 367
 368         /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
 369         if (upcall_info->egress_tun_info)
 370                 size += nla_total_size(ovs_tun_key_attr_size());
 371
 372         /* OVS_PACKET_ATTR_ACTIONS */
 373         if (upcall_info->actions_len)
 374                 size += nla_total_size(actions_attrlen);
 375
 376         /* OVS_PACKET_ATTR_MRU */
 377         if (upcall_info->mru)
 378                 size += nla_total_size(sizeof(upcall_info->mru));
 379
 380         return size;
 381 }
 382
 383 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
 384 {
 385         if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
 386                 size_t plen = NLA_ALIGN(skb->len) - skb->len;
 387
 388                 if (plen > 0)
 389                         skb_put_zero(skb, plen);
 390         }
 391 }
 392
 393 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
 394                                   const struct sw_flow_key *key,
 395                                   const struct dp_upcall_info *upcall_info,
 396                                   uint32_t cutlen)
 397 {
 398         struct ovs_header *upcall;
 399         struct sk_buff *nskb = NULL;
 400         struct sk_buff *user_skb = NULL; /* to be queued to userspace */
 401         struct nlattr *nla;
 402         size_t len;
 403         unsigned int hlen;
 404         int err, dp_ifindex;
 405
 406         dp_ifindex = get_dpifindex(dp);
 407         if (!dp_ifindex)
 408                 return -ENODEV;
 409
 410         if (skb_vlan_tag_present(skb)) {
 411                 nskb = skb_clone(skb, GFP_ATOMIC);
 412                 if (!nskb)
 413                         return -ENOMEM;
 414
 415                 nskb = __vlan_hwaccel_push_inside(nskb);
 416                 if (!nskb)
 417                         return -ENOMEM;
 418
 419                 skb = nskb;
 420         }
 421
 422         if (nla_attr_size(skb->len) > USHRT_MAX) {
 423                 err = -EFBIG;
 424                 goto out;
 425         }
 426
 427         /* Complete checksum if needed */
 428         if (skb->ip_summed == CHECKSUM_PARTIAL &&
 429             (err = skb_csum_hwoffload_help(skb, 0)))
 430                 goto out;
 431
 432         /* Older versions of OVS user space enforce alignment of the last
 433          * Netlink attribute to NLA_ALIGNTO which would require extensive
 434          * padding logic. Only perform zerocopy if padding is not required.
 435          */
 436         if (dp->user_features & OVS_DP_F_UNALIGNED)
 437                 hlen = skb_zerocopy_headlen(skb);
 438         else
 439                 hlen = skb->len;
 440
 441         len = upcall_msg_size(upcall_info, hlen - cutlen,
 442                               OVS_CB(skb)->acts_origlen);
 443         user_skb = genlmsg_new(len, GFP_ATOMIC);
 444         if (!user_skb) {
 445                 err = -ENOMEM;
 446                 goto out;
 447         }
 448
 449         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
 450                              0, upcall_info->cmd);
 451         upcall->dp_ifindex = dp_ifindex;
 452
 453         err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
 454         BUG_ON(err);
 455
 456         if (upcall_info->userdata)
 457                 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
 458                           nla_len(upcall_info->userdata),
 459                           nla_data(upcall_info->userdata));
 460
 461         if (upcall_info->egress_tun_info) {
 462                 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
 463                 err = ovs_nla_put_tunnel_info(user_skb,
 464                                               upcall_info->egress_tun_info);
 465                 BUG_ON(err);
 466                 nla_nest_end(user_skb, nla);
 467         }
 468
 469         if (upcall_info->actions_len) {
 470                 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
 471                 err = ovs_nla_put_actions(upcall_info->actions,
 472                                           upcall_info->actions_len,
 473                                           user_skb);
 474                 if (!err)
 475                         nla_nest_end(user_skb, nla);
 476                 else
 477                         nla_nest_cancel(user_skb, nla);
 478         }
 479
 480         /* Add OVS_PACKET_ATTR_MRU */
 481         if (upcall_info->mru) {
 482                 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
 483                                 upcall_info->mru)) {
 484                         err = -ENOBUFS;
 485                         goto out;
 486                 }
 487                 pad_packet(dp, user_skb);
 488         }
 489
 490         /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
 491         if (cutlen > 0) {
 492                 if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN,
 493                                 skb->len)) {
 494                         err = -ENOBUFS;
 495                         goto out;
 496                 }
 497                 pad_packet(dp, user_skb);
 498         }
 499
 500         /* Only reserve room for attribute header, packet data is added
 501          * in skb_zerocopy() */
 502         if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
 503                 err = -ENOBUFS;
 504                 goto out;
 505         }
 506         nla->nla_len = nla_attr_size(skb->len - cutlen);
 507
 508         err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
 509         if (err)
 510                 goto out;
 511
 512         /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
 513         pad_packet(dp, user_skb);
 514
 515         ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
 516
 517         err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
 518         user_skb = NULL;
 519 out:
 520         if (err)
 521                 skb_tx_error(skb);
 522         kfree_skb(user_skb);
 523         kfree_skb(nskb);
 524         return err;
 525 }
 526
 527 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 528 {
 529         struct ovs_header *ovs_header = info->userhdr;
 530         struct net *net = sock_net(skb->sk);
 531         struct nlattr **a = info->attrs;
 532         struct sw_flow_actions *acts;
 533         struct sk_buff *packet;
 534         struct sw_flow *flow;
 535         struct sw_flow_actions *sf_acts;
 536         struct datapath *dp;
 537         struct vport *input_vport;
 538         u16 mru = 0;
 539         int len;
 540         int err;
 541         bool log = !a[OVS_PACKET_ATTR_PROBE];
 542
 543         err = -EINVAL;
 544         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 545             !a[OVS_PACKET_ATTR_ACTIONS])
 546                 goto err;
 547
 548         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 549         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 550         err = -ENOMEM;
 551         if (!packet)
 552                 goto err;
 553         skb_reserve(packet, NET_IP_ALIGN);
 554
 555         nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
 556
 557         /* Set packet's mru */
 558         if (a[OVS_PACKET_ATTR_MRU]) {
 559                 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
 560                 packet->ignore_df = 1;
 561         }
 562         OVS_CB(packet)->mru = mru;
 563
 564         /* Build an sw_flow for sending this packet. */
 565         flow = ovs_flow_alloc();
 566         err = PTR_ERR(flow);
 567         if (IS_ERR(flow))
 568                 goto err_kfree_skb;
 569
 570         err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
 571                                              packet, &flow->key, log);
 572         if (err)
 573                 goto err_flow_free;
 574
 575         err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
 576                                    &flow->key, &acts, log);
 577         if (err)
 578                 goto err_flow_free;
 579
 580         rcu_assign_pointer(flow->sf_acts, acts);
 581         packet->priority = flow->key.phy.priority;
 582         packet->mark = flow->key.phy.skb_mark;
 583
 584         rcu_read_lock();
 585         dp = get_dp_rcu(net, ovs_header->dp_ifindex);
 586         err = -ENODEV;
 587         if (!dp)
 588                 goto err_unlock;
 589
 590         input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
 591         if (!input_vport)
 592                 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
 593
 594         if (!input_vport)
 595                 goto err_unlock;
 596
 597         packet->dev = input_vport->dev;
 598         OVS_CB(packet)->input_vport = input_vport;
 599         sf_acts = rcu_dereference(flow->sf_acts);
 600
 601         local_bh_disable();
 602         err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
 603         local_bh_enable();
 604         rcu_read_unlock();
 605
 606         ovs_flow_free(flow, false);
 607         return err;
 608
 609 err_unlock:
 610         rcu_read_unlock();
 611 err_flow_free:
 612         ovs_flow_free(flow, false);
 613 err_kfree_skb:
 614         kfree_skb(packet);
 615 err:
 616         return err;
 617 }
 618
 619 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 620         [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
 621         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 622         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 623         [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
 624         [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
 625 };
 626
 627 static const struct genl_ops dp_packet_genl_ops[] = {
 628         { .cmd = OVS_PACKET_CMD_EXECUTE,
 629           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 630           .policy = packet_policy,
 631           .doit = ovs_packet_cmd_execute
 632         }
 633 };
 634
 635 static struct genl_family dp_packet_genl_family __ro_after_init = {
 636         .hdrsize = sizeof(struct ovs_header),
 637         .name = OVS_PACKET_FAMILY,
 638         .version = OVS_PACKET_VERSION,
 639         .maxattr = OVS_PACKET_ATTR_MAX,
 640         .netnsok = true,
 641         .parallel_ops = true,
 642         .ops = dp_packet_genl_ops,
 643         .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
 644         .module = THIS_MODULE,
 645 };
 646
 647 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
 648                          struct ovs_dp_megaflow_stats *mega_stats)
 649 {
 650         int i;
 651
 652         memset(mega_stats, 0, sizeof(*mega_stats));
 653
 654         stats->n_flows = ovs_flow_tbl_count(&dp->table);
 655         mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
 656
 657         stats->n_hit = stats->n_missed = stats->n_lost = 0;
 658
 659         for_each_possible_cpu(i) {
 660                 const struct dp_stats_percpu *percpu_stats;
 661                 struct dp_stats_percpu local_stats;
 662                 unsigned int start;
 663
 664                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 665
 666                 do {
 667                         start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
 668                         local_stats = *percpu_stats;
 669                 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
 670
 671                 stats->n_hit += local_stats.n_hit;
 672                 stats->n_missed += local_stats.n_missed;
 673                 stats->n_lost += local_stats.n_lost;
 674                 mega_stats->n_mask_hit += local_stats.n_mask_hit;
 675         }
 676 }
 677
 678 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
 679 {
 680         return ovs_identifier_is_ufid(sfid) &&
 681                !(ufid_flags & OVS_UFID_F_OMIT_KEY);
 682 }
 683
 684 static bool should_fill_mask(uint32_t ufid_flags)
 685 {
 686         return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
 687 }
 688
 689 static bool should_fill_actions(uint32_t ufid_flags)
 690 {
 691         return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
 692 }
 693
 694 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
 695                                     const struct sw_flow_id *sfid,
 696                                     uint32_t ufid_flags)
 697 {
 698         size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
 699
 700         /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
 701          * see ovs_nla_put_identifier()
 702          */
 703         if (sfid && ovs_identifier_is_ufid(sfid))
 704                 len += nla_total_size(sfid->ufid_len);
 705         else
 706                 len += nla_total_size(ovs_key_attr_size());
 707
 708         /* OVS_FLOW_ATTR_KEY */
 709         if (!sfid || should_fill_key(sfid, ufid_flags))
 710                 len += nla_total_size(ovs_key_attr_size());
 711
 712         /* OVS_FLOW_ATTR_MASK */
 713         if (should_fill_mask(ufid_flags))
 714                 len += nla_total_size(ovs_key_attr_size());
 715
 716         /* OVS_FLOW_ATTR_ACTIONS */
 717         if (should_fill_actions(ufid_flags))
 718                 len += nla_total_size(acts->orig_len);
 719
 720         return len
 721                 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
 722                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
 723                 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
 724 }
 725
 726 /* Called with ovs_mutex or RCU read lock. */
 727 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
 728                                    struct sk_buff *skb)
 729 {
 730         struct ovs_flow_stats stats;
 731         __be16 tcp_flags;
 732         unsigned long used;
 733
 734         ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
 735
 736         if (used &&
 737             nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
 738                               OVS_FLOW_ATTR_PAD))
 739                 return -EMSGSIZE;
 740
 741         if (stats.n_packets &&
 742             nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
 743                           sizeof(struct ovs_flow_stats), &stats,
 744                           OVS_FLOW_ATTR_PAD))
 745                 return -EMSGSIZE;
 746
 747         if ((u8)ntohs(tcp_flags) &&
 748              nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
 749                 return -EMSGSIZE;
 750
 751         return 0;
 752 }
 753
 754 /* Called with ovs_mutex or RCU read lock. */
 755 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
 756                                      struct sk_buff *skb, int skb_orig_len)
 757 {
 758         struct nlattr *start;
 759         int err;
 760
 761         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 762          * this is the first flow to be dumped into 'skb'.  This is unusual for
 763          * Netlink but individual action lists can be longer than
 764          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 765          * The userspace caller can always fetch the actions separately if it
 766          * really wants them.  (Most userspace callers in fact don't care.)
 767          *
 768          * This can only fail for dump operations because the skb is always
 769          * properly sized for single flows.
 770          */
 771         start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
 772         if (start) {
 773                 const struct sw_flow_actions *sf_acts;
 774
 775                 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
 776                 err = ovs_nla_put_actions(sf_acts->actions,
 777                                           sf_acts->actions_len, skb);
 778
 779                 if (!err)
 780                         nla_nest_end(skb, start);
 781                 else {
 782                         if (skb_orig_len)
 783                                 return err;
 784
 785                         nla_nest_cancel(skb, start);
 786                 }
 787         } else if (skb_orig_len) {
 788                 return -EMSGSIZE;
 789         }
 790
 791         return 0;
 792 }
 793
 794 /* Called with ovs_mutex or RCU read lock. */
 795 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
 796                                   struct sk_buff *skb, u32 portid,
 797                                   u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
 798 {
 799         const int skb_orig_len = skb->len;
 800         struct ovs_header *ovs_header;
 801         int err;
 802
 803         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
 804                                  flags, cmd);
 805         if (!ovs_header)
 806                 return -EMSGSIZE;
 807
 808         ovs_header->dp_ifindex = dp_ifindex;
 809
 810         err = ovs_nla_put_identifier(flow, skb);
 811         if (err)
 812                 goto error;
 813
 814         if (should_fill_key(&flow->id, ufid_flags)) {
 815                 err = ovs_nla_put_masked_key(flow, skb);
 816                 if (err)
 817                         goto error;
 818         }
 819
 820         if (should_fill_mask(ufid_flags)) {
 821                 err = ovs_nla_put_mask(flow, skb);
 822                 if (err)
 823                         goto error;
 824         }
 825
 826         err = ovs_flow_cmd_fill_stats(flow, skb);
 827         if (err)
 828                 goto error;
 829
 830         if (should_fill_actions(ufid_flags)) {
 831                 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
 832                 if (err)
 833                         goto error;
 834         }
 835
 836         genlmsg_end(skb, ovs_header);
 837         return 0;
 838
 839 error:
 840         genlmsg_cancel(skb, ovs_header);
 841         return err;
 842 }
 843
 844 /* May not be called with RCU read lock. */
 845 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
 846                                                const struct sw_flow_id *sfid,
 847                                                struct genl_info *info,
 848                                                bool always,
 849                                                uint32_t ufid_flags)
 850 {
 851         struct sk_buff *skb;
 852         size_t len;
 853
 854         if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
 855                 return NULL;
 856
 857         len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
 858         skb = genlmsg_new(len, GFP_KERNEL);
 859         if (!skb)
 860                 return ERR_PTR(-ENOMEM);
 861
 862         return skb;
 863 }
 864
 865 /* Called with ovs_mutex. */
 866 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
 867                                                int dp_ifindex,
 868                                                struct genl_info *info, u8 cmd,
 869                                                bool always, u32 ufid_flags)
 870 {
 871         struct sk_buff *skb;
 872         int retval;
 873
 874         skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
 875                                       &flow->id, info, always, ufid_flags);
 876         if (IS_ERR_OR_NULL(skb))
 877                 return skb;
 878
 879         retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
 880                                         info->snd_portid, info->snd_seq, 0,
 881                                         cmd, ufid_flags);
 882         if (WARN_ON_ONCE(retval < 0)) {
 883                 kfree_skb(skb);
 884                 skb = ERR_PTR(retval);
 885         }
 886         return skb;
 887 }
 888
 889 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
 890 {
 891         struct net *net = sock_net(skb->sk);
 892         struct nlattr **a = info->attrs;
 893         struct ovs_header *ovs_header = info->userhdr;
 894         struct sw_flow *flow = NULL, *new_flow;
 895         struct sw_flow_mask mask;
 896         struct sk_buff *reply;
 897         struct datapath *dp;
 898         struct sw_flow_actions *acts;
 899         struct sw_flow_match match;
 900         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
 901         int error;
 902         bool log = !a[OVS_FLOW_ATTR_PROBE];
 903
 904         /* Must have key and actions. */
 905         error = -EINVAL;
 906         if (!a[OVS_FLOW_ATTR_KEY]) {
 907                 OVS_NLERR(log, "Flow key attr not present in new flow.");
 908                 goto error;
 909         }
 910         if (!a[OVS_FLOW_ATTR_ACTIONS]) {
 911                 OVS_NLERR(log, "Flow actions attr not present in new flow.");
 912                 goto error;
 913         }
 914
 915         /* Most of the time we need to allocate a new flow, do it before
 916          * locking.
 917          */
 918         new_flow = ovs_flow_alloc();
 919         if (IS_ERR(new_flow)) {
 920                 error = PTR_ERR(new_flow);
 921                 goto error;
 922         }
 923
 924         /* Extract key. */
 925         ovs_match_init(&match, &new_flow->key, false, &mask);
 926         error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
 927                                   a[OVS_FLOW_ATTR_MASK], log);
 928         if (error)
 929                 goto err_kfree_flow;
 930
 931         /* Extract flow identifier. */
 932         error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
 933                                        &new_flow->key, log);
 934         if (error)
 935                 goto err_kfree_flow;
 936
 937         /* unmasked key is needed to match when ufid is not used. */
 938         if (ovs_identifier_is_key(&new_flow->id))
 939                 match.key = new_flow->id.unmasked_key;
 940
 941         ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
 942
 943         /* Validate actions. */
 944         error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
 945                                      &new_flow->key, &acts, log);
 946         if (error) {
 947                 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
 948                 goto err_kfree_flow;
 949         }
 950
 951         reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
 952                                         ufid_flags);
 953         if (IS_ERR(reply)) {
 954                 error = PTR_ERR(reply);
 955                 goto err_kfree_acts;
 956         }
 957
 958         ovs_lock();
 959         dp = get_dp(net, ovs_header->dp_ifindex);
 960         if (unlikely(!dp)) {
 961                 error = -ENODEV;
 962                 goto err_unlock_ovs;
 963         }
 964
 965         /* Check if this is a duplicate flow */
 966         if (ovs_identifier_is_ufid(&new_flow->id))
 967                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
 968         if (!flow)
 969                 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
 970         if (likely(!flow)) {
 971                 rcu_assign_pointer(new_flow->sf_acts, acts);
 972
 973                 /* Put flow in bucket. */
 974                 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
 975                 if (unlikely(error)) {
 976                         acts = NULL;
 977                         goto err_unlock_ovs;
 978                 }
 979
 980                 if (unlikely(reply)) {
 981                         error = ovs_flow_cmd_fill_info(new_flow,
 982                                                        ovs_header->dp_ifindex,
 983                                                        reply, info->snd_portid,
 984                                                        info->snd_seq, 0,
 985                                                        OVS_FLOW_CMD_NEW,
 986                                                        ufid_flags);
 987                         BUG_ON(error < 0);
 988                 }
 989                 ovs_unlock();
 990         } else {
 991                 struct sw_flow_actions *old_acts;
 992
 993                 /* Bail out if we're not allowed to modify an existing flow.
 994                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
 995                  * because Generic Netlink treats the latter as a dump
 996                  * request.  We also accept NLM_F_EXCL in case that bug ever
 997                  * gets fixed.
 998                  */
 999                 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1000                                                          | NLM_F_EXCL))) {
1001                         error = -EEXIST;
1002                         goto err_unlock_ovs;
1003                 }
1004                 /* The flow identifier has to be the same for flow updates.
1005                  * Look for any overlapping flow.
1006                  */
1007                 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1008                         if (ovs_identifier_is_key(&flow->id))
1009                                 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1010                                                                  &match);
1011                         else /* UFID matches but key is different */
1012                                 flow = NULL;
1013                         if (!flow) {
1014                                 error = -ENOENT;
1015                                 goto err_unlock_ovs;
1016                         }
1017                 }
1018                 /* Update actions. */
1019                 old_acts = ovsl_dereference(flow->sf_acts);
1020                 rcu_assign_pointer(flow->sf_acts, acts);
1021
1022                 if (unlikely(reply)) {
1023                         error = ovs_flow_cmd_fill_info(flow,
1024                                                        ovs_header->dp_ifindex,
1025                                                        reply, info->snd_portid,
1026                                                        info->snd_seq, 0,
1027                                                        OVS_FLOW_CMD_NEW,
1028                                                        ufid_flags);
1029                         BUG_ON(error < 0);
1030                 }
1031                 ovs_unlock();
1032
1033                 ovs_nla_free_flow_actions_rcu(old_acts);
1034                 ovs_flow_free(new_flow, false);
1035         }
1036
1037         if (reply)
1038                 ovs_notify(&dp_flow_genl_family, reply, info);
1039         return 0;
1040
1041 err_unlock_ovs:
1042         ovs_unlock();
1043         kfree_skb(reply);
1044 err_kfree_acts:
1045         ovs_nla_free_flow_actions(acts);
1046 err_kfree_flow:
1047         ovs_flow_free(new_flow, false);
1048 error:
1049         return error;
1050 }
1051
1052 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1053 static struct sw_flow_actions *get_flow_actions(struct net *net,
1054                                                 const struct nlattr *a,
1055                                                 const struct sw_flow_key *key,
1056                                                 const struct sw_flow_mask *mask,
1057                                                 bool log)
1058 {
1059         struct sw_flow_actions *acts;
1060         struct sw_flow_key masked_key;
1061         int error;
1062
1063         ovs_flow_mask_key(&masked_key, key, true, mask);
1064         error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1065         if (error) {
1066                 OVS_NLERR(log,
1067                           "Actions may not be safe on all matching packets");
1068                 return ERR_PTR(error);
1069         }
1070
1071         return acts;
1072 }
1073
1074 /* Factor out match-init and action-copy to avoid
1075  * "Wframe-larger-than=1024" warning. Because mask is only
1076  * used to get actions, we new a function to save some
1077  * stack space.
1078  *
1079  * If there are not key and action attrs, we return 0
1080  * directly. In the case, the caller will also not use the
1081  * match as before. If there is action attr, we try to get
1082  * actions and save them to *acts. Before returning from
1083  * the function, we reset the match->mask pointer. Because
1084  * we should not to return match object with dangling reference
1085  * to mask.
1086  * */
1087 static int ovs_nla_init_match_and_action(struct net *net,
1088                                          struct sw_flow_match *match,
1089                                          struct sw_flow_key *key,
1090                                          struct nlattr **a,
1091                                          struct sw_flow_actions **acts,
1092                                          bool log)
1093 {
1094         struct sw_flow_mask mask;
1095         int error = 0;
1096
1097         if (a[OVS_FLOW_ATTR_KEY]) {
1098                 ovs_match_init(match, key, true, &mask);
1099                 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1100                                           a[OVS_FLOW_ATTR_MASK], log);
1101                 if (error)
1102                         goto error;
1103         }
1104
1105         if (a[OVS_FLOW_ATTR_ACTIONS]) {
1106                 if (!a[OVS_FLOW_ATTR_KEY]) {
1107                         OVS_NLERR(log,
1108                                   "Flow key attribute not present in set flow.");
1109                         error = -EINVAL;
1110                         goto error;
1111                 }
1112
1113                 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1114                                          &mask, log);
1115                 if (IS_ERR(*acts)) {
1116                         error = PTR_ERR(*acts);
1117                         goto error;
1118                 }
1119         }
1120
1121         /* On success, error is 0. */
1122 error:
1123         match->mask = NULL;
1124         return error;
1125 }
1126
1127 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1128 {
1129         struct net *net = sock_net(skb->sk);
1130         struct nlattr **a = info->attrs;
1131         struct ovs_header *ovs_header = info->userhdr;
1132         struct sw_flow_key key;
1133         struct sw_flow *flow;
1134         struct sk_buff *reply = NULL;
1135         struct datapath *dp;
1136         struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1137         struct sw_flow_match match;
1138         struct sw_flow_id sfid;
1139         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1140         int error = 0;
1141         bool log = !a[OVS_FLOW_ATTR_PROBE];
1142         bool ufid_present;
1143
1144         ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1145         if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1146                 OVS_NLERR(log,
1147                           "Flow set message rejected, Key attribute missing.");
1148                 return -EINVAL;
1149         }
1150
1151         error = ovs_nla_init_match_and_action(net, &match, &key, a,
1152                                               &acts, log);
1153         if (error)
1154                 goto error;
1155
1156         if (acts) {
1157                 /* Can allocate before locking if have acts. */
1158                 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1159                                                 ufid_flags);
1160                 if (IS_ERR(reply)) {
1161                         error = PTR_ERR(reply);
1162                         goto err_kfree_acts;
1163                 }
1164         }
1165
1166         ovs_lock();
1167         dp = get_dp(net, ovs_header->dp_ifindex);
1168         if (unlikely(!dp)) {
1169                 error = -ENODEV;
1170                 goto err_unlock_ovs;
1171         }
1172         /* Check that the flow exists. */
1173         if (ufid_present)
1174                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1175         else
1176                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1177         if (unlikely(!flow)) {
1178                 error = -ENOENT;
1179                 goto err_unlock_ovs;
1180         }
1181
1182         /* Update actions, if present. */
1183         if (likely(acts)) {
1184                 old_acts = ovsl_dereference(flow->sf_acts);
1185                 rcu_assign_pointer(flow->sf_acts, acts);
1186
1187                 if (unlikely(reply)) {
1188                         error = ovs_flow_cmd_fill_info(flow,
1189                                                        ovs_header->dp_ifindex,
1190                                                        reply, info->snd_portid,
1191                                                        info->snd_seq, 0,
1192                                                        OVS_FLOW_CMD_NEW,
1193                                                        ufid_flags);
1194                         BUG_ON(error < 0);
1195                 }
1196         } else {
1197                 /* Could not alloc without acts before locking. */
1198                 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1199                                                 info, OVS_FLOW_CMD_NEW, false,
1200                                                 ufid_flags);
1201
1202                 if (IS_ERR(reply)) {
1203                         error = PTR_ERR(reply);
1204                         goto err_unlock_ovs;
1205                 }
1206         }
1207
1208         /* Clear stats. */
1209         if (a[OVS_FLOW_ATTR_CLEAR])
1210                 ovs_flow_stats_clear(flow);
1211         ovs_unlock();
1212
1213         if (reply)
1214                 ovs_notify(&dp_flow_genl_family, reply, info);
1215         if (old_acts)
1216                 ovs_nla_free_flow_actions_rcu(old_acts);
1217
1218         return 0;
1219
1220 err_unlock_ovs:
1221         ovs_unlock();
1222         kfree_skb(reply);
1223 err_kfree_acts:
1224         ovs_nla_free_flow_actions(acts);
1225 error:
1226         return error;
1227 }
1228
1229 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1230 {
1231         struct nlattr **a = info->attrs;
1232         struct ovs_header *ovs_header = info->userhdr;
1233         struct net *net = sock_net(skb->sk);
1234         struct sw_flow_key key;
1235         struct sk_buff *reply;
1236         struct sw_flow *flow;
1237         struct datapath *dp;
1238         struct sw_flow_match match;
1239         struct sw_flow_id ufid;
1240         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1241         int err = 0;
1242         bool log = !a[OVS_FLOW_ATTR_PROBE];
1243         bool ufid_present;
1244
1245         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1246         if (a[OVS_FLOW_ATTR_KEY]) {
1247                 ovs_match_init(&match, &key, true, NULL);
1248                 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1249                                         log);
1250         } else if (!ufid_present) {
1251                 OVS_NLERR(log,
1252                           "Flow get message rejected, Key attribute missing.");
1253                 err = -EINVAL;
1254         }
1255         if (err)
1256                 return err;
1257
1258         ovs_lock();
1259         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1260         if (!dp) {
1261                 err = -ENODEV;
1262                 goto unlock;
1263         }
1264
1265         if (ufid_present)
1266                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1267         else
1268                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1269         if (!flow) {
1270                 err = -ENOENT;
1271                 goto unlock;
1272         }
1273
1274         reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1275                                         OVS_FLOW_CMD_NEW, true, ufid_flags);
1276         if (IS_ERR(reply)) {
1277                 err = PTR_ERR(reply);
1278                 goto unlock;
1279         }
1280
1281         ovs_unlock();
1282         return genlmsg_reply(reply, info);
1283 unlock:
1284         ovs_unlock();
1285         return err;
1286 }
1287
1288 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1289 {
1290         struct nlattr **a = info->attrs;
1291         struct ovs_header *ovs_header = info->userhdr;
1292         struct net *net = sock_net(skb->sk);
1293         struct sw_flow_key key;
1294         struct sk_buff *reply;
1295         struct sw_flow *flow = NULL;
1296         struct datapath *dp;
1297         struct sw_flow_match match;
1298         struct sw_flow_id ufid;
1299         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1300         int err;
1301         bool log = !a[OVS_FLOW_ATTR_PROBE];
1302         bool ufid_present;
1303
1304         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1305         if (a[OVS_FLOW_ATTR_KEY]) {
1306                 ovs_match_init(&match, &key, true, NULL);
1307                 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1308                                         NULL, log);
1309                 if (unlikely(err))
1310                         return err;
1311         }
1312
1313         ovs_lock();
1314         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1315         if (unlikely(!dp)) {
1316                 err = -ENODEV;
1317                 goto unlock;
1318         }
1319
1320         if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1321                 err = ovs_flow_tbl_flush(&dp->table);
1322                 goto unlock;
1323         }
1324
1325         if (ufid_present)
1326                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1327         else
1328                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1329         if (unlikely(!flow)) {
1330                 err = -ENOENT;
1331                 goto unlock;
1332         }
1333
1334         ovs_flow_tbl_remove(&dp->table, flow);
1335         ovs_unlock();
1336
1337         reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1338                                         &flow->id, info, false, ufid_flags);
1339         if (likely(reply)) {
1340                 if (likely(!IS_ERR(reply))) {
1341                         rcu_read_lock();        /*To keep RCU checker happy. */
1342                         err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1343                                                      reply, info->snd_portid,
1344                                                      info->snd_seq, 0,
1345                                                      OVS_FLOW_CMD_DEL,
1346                                                      ufid_flags);
1347                         rcu_read_unlock();
1348                         if (WARN_ON_ONCE(err < 0)) {
1349                                 kfree_skb(reply);
1350                                 goto out_free;
1351                         }
1352
1353                         ovs_notify(&dp_flow_genl_family, reply, info);
1354                 } else {
1355                         netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1356                 }
1357         }
1358
1359 out_free:
1360         ovs_flow_free(flow, true);
1361         return 0;
1362 unlock:
1363         ovs_unlock();
1364         return err;
1365 }
1366
1367 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1368 {
1369         struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1370         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1371         struct table_instance *ti;
1372         struct datapath *dp;
1373         u32 ufid_flags;
1374         int err;
1375
1376         err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1377                             OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1378         if (err)
1379                 return err;
1380         ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1381
1382         rcu_read_lock();
1383         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1384         if (!dp) {
1385                 rcu_read_unlock();
1386                 return -ENODEV;
1387         }
1388
1389         ti = rcu_dereference(dp->table.ti);
1390         for (;;) {
1391                 struct sw_flow *flow;
1392                 u32 bucket, obj;
1393
1394                 bucket = cb->args[0];
1395                 obj = cb->args[1];
1396                 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1397                 if (!flow)
1398                         break;
1399
1400                 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1401                                            NETLINK_CB(cb->skb).portid,
1402                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1403                                            OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1404                         break;
1405
1406                 cb->args[0] = bucket;
1407                 cb->args[1] = obj;
1408         }
1409         rcu_read_unlock();
1410         return skb->len;
1411 }
1412
1413 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1414         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1415         [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1416         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1417         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1418         [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1419         [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1420         [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1421 };
1422
1423 static const struct genl_ops dp_flow_genl_ops[] = {
1424         { .cmd = OVS_FLOW_CMD_NEW,
1425           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1426           .policy = flow_policy,
1427           .doit = ovs_flow_cmd_new
1428         },
1429         { .cmd = OVS_FLOW_CMD_DEL,
1430           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1431           .policy = flow_policy,
1432           .doit = ovs_flow_cmd_del
1433         },
1434         { .cmd = OVS_FLOW_CMD_GET,
1435           .flags = 0,               /* OK for unprivileged users. */
1436           .policy = flow_policy,
1437           .doit = ovs_flow_cmd_get,
1438           .dumpit = ovs_flow_cmd_dump
1439         },
1440         { .cmd = OVS_FLOW_CMD_SET,
1441           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1442           .policy = flow_policy,
1443           .doit = ovs_flow_cmd_set,
1444         },
1445 };
1446
1447 static struct genl_family dp_flow_genl_family __ro_after_init = {
1448         .hdrsize = sizeof(struct ovs_header),
1449         .name = OVS_FLOW_FAMILY,
1450         .version = OVS_FLOW_VERSION,
1451         .maxattr = OVS_FLOW_ATTR_MAX,
1452         .netnsok = true,
1453         .parallel_ops = true,
1454         .ops = dp_flow_genl_ops,
1455         .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1456         .mcgrps = &ovs_dp_flow_multicast_group,
1457         .n_mcgrps = 1,
1458         .module = THIS_MODULE,
1459 };
1460
1461 static size_t ovs_dp_cmd_msg_size(void)
1462 {
1463         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1464
1465         msgsize += nla_total_size(IFNAMSIZ);
1466         msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1467         msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1468         msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1469
1470         return msgsize;
1471 }
1472
1473 /* Called with ovs_mutex. */
1474 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1475                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1476 {
1477         struct ovs_header *ovs_header;
1478         struct ovs_dp_stats dp_stats;
1479         struct ovs_dp_megaflow_stats dp_megaflow_stats;
1480         int err;
1481
1482         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1483                                    flags, cmd);
1484         if (!ovs_header)
1485                 goto error;
1486
1487         ovs_header->dp_ifindex = get_dpifindex(dp);
1488
1489         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1490         if (err)
1491                 goto nla_put_failure;
1492
1493         get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1494         if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1495                           &dp_stats, OVS_DP_ATTR_PAD))
1496                 goto nla_put_failure;
1497
1498         if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1499                           sizeof(struct ovs_dp_megaflow_stats),
1500                           &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1501                 goto nla_put_failure;
1502
1503         if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1504                 goto nla_put_failure;
1505
1506         genlmsg_end(skb, ovs_header);
1507         return 0;
1508
1509 nla_put_failure:
1510         genlmsg_cancel(skb, ovs_header);
1511 error:
1512         return -EMSGSIZE;
1513 }
1514
1515 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1516 {
1517         return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1518 }
1519
1520 /* Called with rcu_read_lock or ovs_mutex. */
1521 static struct datapath *lookup_datapath(struct net *net,
1522                                         const struct ovs_header *ovs_header,
1523                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1524 {
1525         struct datapath *dp;
1526
1527         if (!a[OVS_DP_ATTR_NAME])
1528                 dp = get_dp(net, ovs_header->dp_ifindex);
1529         else {
1530                 struct vport *vport;
1531
1532                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1533                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1534         }
1535         return dp ? dp : ERR_PTR(-ENODEV);
1536 }
1537
1538 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1539 {
1540         struct datapath *dp;
1541
1542         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1543         if (IS_ERR(dp))
1544                 return;
1545
1546         WARN(dp->user_features, "Dropping previously announced user features\n");
1547         dp->user_features = 0;
1548 }
1549
1550 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1551 {
1552         if (a[OVS_DP_ATTR_USER_FEATURES])
1553                 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1554 }
1555
1556 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1557 {
1558         struct nlattr **a = info->attrs;
1559         struct vport_parms parms;
1560         struct sk_buff *reply;
1561         struct datapath *dp;
1562         struct vport *vport;
1563         struct ovs_net *ovs_net;
1564         int err, i;
1565
1566         err = -EINVAL;
1567         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1568                 goto err;
1569
1570         reply = ovs_dp_cmd_alloc_info();
1571         if (!reply)
1572                 return -ENOMEM;
1573
1574         err = -ENOMEM;
1575         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1576         if (dp == NULL)
1577                 goto err_free_reply;
1578
1579         ovs_dp_set_net(dp, sock_net(skb->sk));
1580
1581         /* Allocate table. */
1582         err = ovs_flow_tbl_init(&dp->table);
1583         if (err)
1584                 goto err_free_dp;
1585
1586         dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1587         if (!dp->stats_percpu) {
1588                 err = -ENOMEM;
1589                 goto err_destroy_table;
1590         }
1591
1592         dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
1593                                   sizeof(struct hlist_head),
1594                                   GFP_KERNEL);
1595         if (!dp->ports) {
1596                 err = -ENOMEM;
1597                 goto err_destroy_percpu;
1598         }
1599
1600         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1601                 INIT_HLIST_HEAD(&dp->ports[i]);
1602
1603         err = ovs_meters_init(dp);
1604         if (err)
1605                 goto err_destroy_ports_array;
1606
1607         /* Set up our datapath device. */
1608         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1609         parms.type = OVS_VPORT_TYPE_INTERNAL;
1610         parms.options = NULL;
1611         parms.dp = dp;
1612         parms.port_no = OVSP_LOCAL;
1613         parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1614
1615         ovs_dp_change(dp, a);
1616
1617         /* So far only local changes have been made, now need the lock. */
1618         ovs_lock();
1619
1620         vport = new_vport(&parms);
1621         if (IS_ERR(vport)) {
1622                 err = PTR_ERR(vport);
1623                 if (err == -EBUSY)
1624                         err = -EEXIST;
1625
1626                 if (err == -EEXIST) {
1627                         /* An outdated user space instance that does not understand
1628                          * the concept of user_features has attempted to create a new
1629                          * datapath and is likely to reuse it. Drop all user features.
1630                          */
1631                         if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1632                                 ovs_dp_reset_user_features(skb, info);
1633                 }
1634
1635                 goto err_destroy_meters;
1636         }
1637
1638         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1639                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1640         BUG_ON(err < 0);
1641
1642         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1643         list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1644
1645         ovs_unlock();
1646
1647         ovs_notify(&dp_datapath_genl_family, reply, info);
1648         return 0;
1649
1650 err_destroy_meters:
1651         ovs_unlock();
1652         ovs_meters_exit(dp);
1653 err_destroy_ports_array:
1654         kfree(dp->ports);
1655 err_destroy_percpu:
1656         free_percpu(dp->stats_percpu);
1657 err_destroy_table:
1658         ovs_flow_tbl_destroy(&dp->table);
1659 err_free_dp:
1660         kfree(dp);
1661 err_free_reply:
1662         kfree_skb(reply);
1663 err:
1664         return err;
1665 }
1666
1667 /* Called with ovs_mutex. */
1668 static void __dp_destroy(struct datapath *dp)
1669 {
1670         int i;
1671
1672         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1673                 struct vport *vport;
1674                 struct hlist_node *n;
1675
1676                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1677                         if (vport->port_no != OVSP_LOCAL)
1678                                 ovs_dp_detach_port(vport);
1679         }
1680
1681         list_del_rcu(&dp->list_node);
1682
1683         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1684          * all ports in datapath are destroyed first before freeing datapath.
1685          */
1686         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1687
1688         /* RCU destroy the flow table */
1689         call_rcu(&dp->rcu, destroy_dp_rcu);
1690 }
1691
1692 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1693 {
1694         struct sk_buff *reply;
1695         struct datapath *dp;
1696         int err;
1697
1698         reply = ovs_dp_cmd_alloc_info();
1699         if (!reply)
1700                 return -ENOMEM;
1701
1702         ovs_lock();
1703         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1704         err = PTR_ERR(dp);
1705         if (IS_ERR(dp))
1706                 goto err_unlock_free;
1707
1708         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1709                                    info->snd_seq, 0, OVS_DP_CMD_DEL);
1710         BUG_ON(err < 0);
1711
1712         __dp_destroy(dp);
1713         ovs_unlock();
1714
1715         ovs_notify(&dp_datapath_genl_family, reply, info);
1716
1717         return 0;
1718
1719 err_unlock_free:
1720         ovs_unlock();
1721         kfree_skb(reply);
1722         return err;
1723 }
1724
1725 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1726 {
1727         struct sk_buff *reply;
1728         struct datapath *dp;
1729         int err;
1730
1731         reply = ovs_dp_cmd_alloc_info();
1732         if (!reply)
1733                 return -ENOMEM;
1734
1735         ovs_lock();
1736         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1737         err = PTR_ERR(dp);
1738         if (IS_ERR(dp))
1739                 goto err_unlock_free;
1740
1741         ovs_dp_change(dp, info->attrs);
1742
1743         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1744                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1745         BUG_ON(err < 0);
1746
1747         ovs_unlock();
1748         ovs_notify(&dp_datapath_genl_family, reply, info);
1749
1750         return 0;
1751
1752 err_unlock_free:
1753         ovs_unlock();
1754         kfree_skb(reply);
1755         return err;
1756 }
1757
1758 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1759 {
1760         struct sk_buff *reply;
1761         struct datapath *dp;
1762         int err;
1763
1764         reply = ovs_dp_cmd_alloc_info();
1765         if (!reply)
1766                 return -ENOMEM;
1767
1768         ovs_lock();
1769         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1770         if (IS_ERR(dp)) {
1771                 err = PTR_ERR(dp);
1772                 goto err_unlock_free;
1773         }
1774         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1775                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1776         BUG_ON(err < 0);
1777         ovs_unlock();
1778
1779         return genlmsg_reply(reply, info);
1780
1781 err_unlock_free:
1782         ovs_unlock();
1783         kfree_skb(reply);
1784         return err;
1785 }
1786
1787 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1788 {
1789         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1790         struct datapath *dp;
1791         int skip = cb->args[0];
1792         int i = 0;
1793
1794         ovs_lock();
1795         list_for_each_entry(dp, &ovs_net->dps, list_node) {
1796                 if (i >= skip &&
1797                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1798                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1799                                          OVS_DP_CMD_NEW) < 0)
1800                         break;
1801                 i++;
1802         }
1803         ovs_unlock();
1804
1805         cb->args[0] = i;
1806
1807         return skb->len;
1808 }
1809
1810 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1811         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1812         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1813         [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1814 };
1815
1816 static const struct genl_ops dp_datapath_genl_ops[] = {
1817         { .cmd = OVS_DP_CMD_NEW,
1818           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1819           .policy = datapath_policy,
1820           .doit = ovs_dp_cmd_new
1821         },
1822         { .cmd = OVS_DP_CMD_DEL,
1823           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1824           .policy = datapath_policy,
1825           .doit = ovs_dp_cmd_del
1826         },
1827         { .cmd = OVS_DP_CMD_GET,
1828           .flags = 0,               /* OK for unprivileged users. */
1829           .policy = datapath_policy,
1830           .doit = ovs_dp_cmd_get,
1831           .dumpit = ovs_dp_cmd_dump
1832         },
1833         { .cmd = OVS_DP_CMD_SET,
1834           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1835           .policy = datapath_policy,
1836           .doit = ovs_dp_cmd_set,
1837         },
1838 };
1839
1840 static struct genl_family dp_datapath_genl_family __ro_after_init = {
1841         .hdrsize = sizeof(struct ovs_header),
1842         .name = OVS_DATAPATH_FAMILY,
1843         .version = OVS_DATAPATH_VERSION,
1844         .maxattr = OVS_DP_ATTR_MAX,
1845         .netnsok = true,
1846         .parallel_ops = true,
1847         .ops = dp_datapath_genl_ops,
1848         .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1849         .mcgrps = &ovs_dp_datapath_multicast_group,
1850         .n_mcgrps = 1,
1851         .module = THIS_MODULE,
1852 };
1853
1854 /* Called with ovs_mutex or RCU read lock. */
1855 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1856                                    struct net *net, u32 portid, u32 seq,
1857                                    u32 flags, u8 cmd, gfp_t gfp)
1858 {
1859         struct ovs_header *ovs_header;
1860         struct ovs_vport_stats vport_stats;
1861         int err;
1862
1863         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1864                                  flags, cmd);
1865         if (!ovs_header)
1866                 return -EMSGSIZE;
1867
1868         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1869
1870         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1871             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1872             nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1873                            ovs_vport_name(vport)) ||
1874             nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
1875                 goto nla_put_failure;
1876
1877         if (!net_eq(net, dev_net(vport->dev))) {
1878                 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp);
1879
1880                 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
1881                         goto nla_put_failure;
1882         }
1883
1884         ovs_vport_get_stats(vport, &vport_stats);
1885         if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
1886                           sizeof(struct ovs_vport_stats), &vport_stats,
1887                           OVS_VPORT_ATTR_PAD))
1888                 goto nla_put_failure;
1889
1890         if (ovs_vport_get_upcall_portids(vport, skb))
1891                 goto nla_put_failure;
1892
1893         err = ovs_vport_get_options(vport, skb);
1894         if (err == -EMSGSIZE)
1895                 goto error;
1896
1897         genlmsg_end(skb, ovs_header);
1898         return 0;
1899
1900 nla_put_failure:
1901         err = -EMSGSIZE;
1902 error:
1903         genlmsg_cancel(skb, ovs_header);
1904         return err;
1905 }
1906
1907 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1908 {
1909         return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1910 }
1911
1912 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1913 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
1914                                          u32 portid, u32 seq, u8 cmd)
1915 {
1916         struct sk_buff *skb;
1917         int retval;
1918
1919         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1920         if (!skb)
1921                 return ERR_PTR(-ENOMEM);
1922
1923         retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd,
1924                                          GFP_KERNEL);
1925         BUG_ON(retval < 0);
1926
1927         return skb;
1928 }
1929
1930 /* Called with ovs_mutex or RCU read lock. */
1931 static struct vport *lookup_vport(struct net *net,
1932                                   const struct ovs_header *ovs_header,
1933                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1934 {
1935         struct datapath *dp;
1936         struct vport *vport;
1937
1938         if (a[OVS_VPORT_ATTR_IFINDEX])
1939                 return ERR_PTR(-EOPNOTSUPP);
1940         if (a[OVS_VPORT_ATTR_NAME]) {
1941                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1942                 if (!vport)
1943                         return ERR_PTR(-ENODEV);
1944                 if (ovs_header->dp_ifindex &&
1945                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1946                         return ERR_PTR(-ENODEV);
1947                 return vport;
1948         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1949                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1950
1951                 if (port_no >= DP_MAX_PORTS)
1952                         return ERR_PTR(-EFBIG);
1953
1954                 dp = get_dp(net, ovs_header->dp_ifindex);
1955                 if (!dp)
1956                         return ERR_PTR(-ENODEV);
1957
1958                 vport = ovs_vport_ovsl_rcu(dp, port_no);
1959                 if (!vport)
1960                         return ERR_PTR(-ENODEV);
1961                 return vport;
1962         } else
1963                 return ERR_PTR(-EINVAL);
1964
1965 }
1966
1967 /* Called with ovs_mutex */
1968 static void update_headroom(struct datapath *dp)
1969 {
1970         unsigned dev_headroom, max_headroom = 0;
1971         struct net_device *dev;
1972         struct vport *vport;
1973         int i;
1974
1975         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1976                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1977                         dev = vport->dev;
1978                         dev_headroom = netdev_get_fwd_headroom(dev);
1979                         if (dev_headroom > max_headroom)
1980                                 max_headroom = dev_headroom;
1981                 }
1982         }
1983
1984         dp->max_headroom = max_headroom;
1985         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1986                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
1987                         netdev_set_rx_headroom(vport->dev, max_headroom);
1988 }
1989
1990 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1991 {
1992         struct nlattr **a = info->attrs;
1993         struct ovs_header *ovs_header = info->userhdr;
1994         struct vport_parms parms;
1995         struct sk_buff *reply;
1996         struct vport *vport;
1997         struct datapath *dp;
1998         u32 port_no;
1999         int err;
2000
2001         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2002             !a[OVS_VPORT_ATTR_UPCALL_PID])
2003                 return -EINVAL;
2004         if (a[OVS_VPORT_ATTR_IFINDEX])
2005                 return -EOPNOTSUPP;
2006
2007         port_no = a[OVS_VPORT_ATTR_PORT_NO]
2008                 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2009         if (port_no >= DP_MAX_PORTS)
2010                 return -EFBIG;
2011
2012         reply = ovs_vport_cmd_alloc_info();
2013         if (!reply)
2014                 return -ENOMEM;
2015
2016         ovs_lock();
2017 restart:
2018         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2019         err = -ENODEV;
2020         if (!dp)
2021                 goto exit_unlock_free;
2022
2023         if (port_no) {
2024                 vport = ovs_vport_ovsl(dp, port_no);
2025                 err = -EBUSY;
2026                 if (vport)
2027                         goto exit_unlock_free;
2028         } else {
2029                 for (port_no = 1; ; port_no++) {
2030                         if (port_no >= DP_MAX_PORTS) {
2031                                 err = -EFBIG;
2032                                 goto exit_unlock_free;
2033                         }
2034                         vport = ovs_vport_ovsl(dp, port_no);
2035                         if (!vport)
2036                                 break;
2037                 }
2038         }
2039
2040         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2041         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2042         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2043         parms.dp = dp;
2044         parms.port_no = port_no;
2045         parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2046
2047         vport = new_vport(&parms);
2048         err = PTR_ERR(vport);
2049         if (IS_ERR(vport)) {
2050                 if (err == -EAGAIN)
2051                         goto restart;
2052                 goto exit_unlock_free;
2053         }
2054
2055         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2056                                       info->snd_portid, info->snd_seq, 0,
2057                                       OVS_VPORT_CMD_NEW, GFP_KERNEL);
2058
2059         if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom)
2060                 update_headroom(dp);
2061         else
2062                 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2063
2064         BUG_ON(err < 0);
2065         ovs_unlock();
2066
2067         ovs_notify(&dp_vport_genl_family, reply, info);
2068         return 0;
2069
2070 exit_unlock_free:
2071         ovs_unlock();
2072         kfree_skb(reply);
2073         return err;
2074 }
2075
2076 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2077 {
2078         struct nlattr **a = info->attrs;
2079         struct sk_buff *reply;
2080         struct vport *vport;
2081         int err;
2082
2083         reply = ovs_vport_cmd_alloc_info();
2084         if (!reply)
2085                 return -ENOMEM;
2086
2087         ovs_lock();
2088         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2089         err = PTR_ERR(vport);
2090         if (IS_ERR(vport))
2091                 goto exit_unlock_free;
2092
2093         if (a[OVS_VPORT_ATTR_TYPE] &&
2094             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2095                 err = -EINVAL;
2096                 goto exit_unlock_free;
2097         }
2098
2099         if (a[OVS_VPORT_ATTR_OPTIONS]) {
2100                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2101                 if (err)
2102                         goto exit_unlock_free;
2103         }
2104
2105
2106         if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2107                 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2108
2109                 err = ovs_vport_set_upcall_portids(vport, ids);
2110                 if (err)
2111                         goto exit_unlock_free;
2112         }
2113
2114         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2115                                       info->snd_portid, info->snd_seq, 0,
2116                                       OVS_VPORT_CMD_NEW, GFP_ATOMIC);
2117         BUG_ON(err < 0);
2118
2119         ovs_unlock();
2120         ovs_notify(&dp_vport_genl_family, reply, info);
2121         return 0;
2122
2123 exit_unlock_free:
2124         ovs_unlock();
2125         kfree_skb(reply);
2126         return err;
2127 }
2128
2129 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2130 {
2131         bool must_update_headroom = false;
2132         struct nlattr **a = info->attrs;
2133         struct sk_buff *reply;
2134         struct datapath *dp;
2135         struct vport *vport;
2136         int err;
2137
2138         reply = ovs_vport_cmd_alloc_info();
2139         if (!reply)
2140                 return -ENOMEM;
2141
2142         ovs_lock();
2143         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2144         err = PTR_ERR(vport);
2145         if (IS_ERR(vport))
2146                 goto exit_unlock_free;
2147
2148         if (vport->port_no == OVSP_LOCAL) {
2149                 err = -EINVAL;
2150                 goto exit_unlock_free;
2151         }
2152
2153         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2154                                       info->snd_portid, info->snd_seq, 0,
2155                                       OVS_VPORT_CMD_DEL, GFP_KERNEL);
2156         BUG_ON(err < 0);
2157
2158         /* the vport deletion may trigger dp headroom update */
2159         dp = vport->dp;
2160         if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2161                 must_update_headroom = true;
2162         netdev_reset_rx_headroom(vport->dev);
2163         ovs_dp_detach_port(vport);
2164
2165         if (must_update_headroom)
2166                 update_headroom(dp);
2167         ovs_unlock();
2168
2169         ovs_notify(&dp_vport_genl_family, reply, info);
2170         return 0;
2171
2172 exit_unlock_free:
2173         ovs_unlock();
2174         kfree_skb(reply);
2175         return err;
2176 }
2177
2178 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2179 {
2180         struct nlattr **a = info->attrs;
2181         struct ovs_header *ovs_header = info->userhdr;
2182         struct sk_buff *reply;
2183         struct vport *vport;
2184         int err;
2185
2186         reply = ovs_vport_cmd_alloc_info();
2187         if (!reply)
2188                 return -ENOMEM;
2189
2190         rcu_read_lock();
2191         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2192         err = PTR_ERR(vport);
2193         if (IS_ERR(vport))
2194                 goto exit_unlock_free;
2195         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2196                                       info->snd_portid, info->snd_seq, 0,
2197                                       OVS_VPORT_CMD_NEW, GFP_ATOMIC);
2198         BUG_ON(err < 0);
2199         rcu_read_unlock();
2200
2201         return genlmsg_reply(reply, info);
2202
2203 exit_unlock_free:
2204         rcu_read_unlock();
2205         kfree_skb(reply);
2206         return err;
2207 }
2208
2209 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2210 {
2211         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2212         struct datapath *dp;
2213         int bucket = cb->args[0], skip = cb->args[1];
2214         int i, j = 0;
2215
2216         rcu_read_lock();
2217         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2218         if (!dp) {
2219                 rcu_read_unlock();
2220                 return -ENODEV;
2221         }
2222         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2223                 struct vport *vport;
2224
2225                 j = 0;
2226                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2227                         if (j >= skip &&
2228                             ovs_vport_cmd_fill_info(vport, skb,
2229                                                     sock_net(skb->sk),
2230                                                     NETLINK_CB(cb->skb).portid,
2231                                                     cb->nlh->nlmsg_seq,
2232                                                     NLM_F_MULTI,
2233                                                     OVS_VPORT_CMD_NEW,
2234                                                     GFP_ATOMIC) < 0)
2235                                 goto out;
2236
2237                         j++;
2238                 }
2239                 skip = 0;
2240         }
2241 out:
2242         rcu_read_unlock();
2243
2244         cb->args[0] = i;
2245         cb->args[1] = j;
2246
2247         return skb->len;
2248 }
2249
2250 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2251         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2252         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2253         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2254         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2255         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2256         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2257         [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 },
2258         [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2259 };
2260
2261 static const struct genl_ops dp_vport_genl_ops[] = {
2262         { .cmd = OVS_VPORT_CMD_NEW,
2263           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2264           .policy = vport_policy,
2265           .doit = ovs_vport_cmd_new
2266         },
2267         { .cmd = OVS_VPORT_CMD_DEL,
2268           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2269           .policy = vport_policy,
2270           .doit = ovs_vport_cmd_del
2271         },
2272         { .cmd = OVS_VPORT_CMD_GET,
2273           .flags = 0,               /* OK for unprivileged users. */
2274           .policy = vport_policy,
2275           .doit = ovs_vport_cmd_get,
2276           .dumpit = ovs_vport_cmd_dump
2277         },
2278         { .cmd = OVS_VPORT_CMD_SET,
2279           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2280           .policy = vport_policy,
2281           .doit = ovs_vport_cmd_set,
2282         },
2283 };
2284
2285 struct genl_family dp_vport_genl_family __ro_after_init = {
2286         .hdrsize = sizeof(struct ovs_header),
2287         .name = OVS_VPORT_FAMILY,
2288         .version = OVS_VPORT_VERSION,
2289         .maxattr = OVS_VPORT_ATTR_MAX,
2290         .netnsok = true,
2291         .parallel_ops = true,
2292         .ops = dp_vport_genl_ops,
2293         .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2294         .mcgrps = &ovs_dp_vport_multicast_group,
2295         .n_mcgrps = 1,
2296         .module = THIS_MODULE,
2297 };
2298
2299 static struct genl_family * const dp_genl_families[] = {
2300         &dp_datapath_genl_family,
2301         &dp_vport_genl_family,
2302         &dp_flow_genl_family,
2303         &dp_packet_genl_family,
2304         &dp_meter_genl_family,
2305 #if     IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2306         &dp_ct_limit_genl_family,
2307 #endif
2308 };
2309
2310 static void dp_unregister_genl(int n_families)
2311 {
2312         int i;
2313
2314         for (i = 0; i < n_families; i++)
2315                 genl_unregister_family(dp_genl_families[i]);
2316 }
2317
2318 static int __init dp_register_genl(void)
2319 {
2320         int err;
2321         int i;
2322
2323         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2324
2325                 err = genl_register_family(dp_genl_families[i]);
2326                 if (err)
2327                         goto error;
2328         }
2329
2330         return 0;
2331
2332 error:
2333         dp_unregister_genl(i);
2334         return err;
2335 }
2336
2337 static int __net_init ovs_init_net(struct net *net)
2338 {
2339         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2340
2341         INIT_LIST_HEAD(&ovs_net->dps);
2342         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2343         return ovs_ct_init(net);
2344 }
2345
2346 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2347                                             struct list_head *head)
2348 {
2349         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2350         struct datapath *dp;
2351
2352         list_for_each_entry(dp, &ovs_net->dps, list_node) {
2353                 int i;
2354
2355                 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2356                         struct vport *vport;
2357
2358                         hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2359                                 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2360                                         continue;
2361
2362                                 if (dev_net(vport->dev) == dnet)
2363                                         list_add(&vport->detach_list, head);
2364                         }
2365                 }
2366         }
2367 }
2368
2369 static void __net_exit ovs_exit_net(struct net *dnet)
2370 {
2371         struct datapath *dp, *dp_next;
2372         struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2373         struct vport *vport, *vport_next;
2374         struct net *net;
2375         LIST_HEAD(head);
2376
2377         ovs_ct_exit(dnet);
2378         ovs_lock();
2379         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2380                 __dp_destroy(dp);
2381
2382         down_read(&net_rwsem);
2383         for_each_net(net)
2384                 list_vports_from_net(net, dnet, &head);
2385         up_read(&net_rwsem);
2386
2387         /* Detach all vports from given namespace. */
2388         list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2389                 list_del(&vport->detach_list);
2390                 ovs_dp_detach_port(vport);
2391         }
2392
2393         ovs_unlock();
2394
2395         cancel_work_sync(&ovs_net->dp_notify_work);
2396 }
2397
2398 static struct pernet_operations ovs_net_ops = {
2399         .init = ovs_init_net,
2400         .exit = ovs_exit_net,
2401         .id   = &ovs_net_id,
2402         .size = sizeof(struct ovs_net),
2403 };
2404
2405 static int __init dp_init(void)
2406 {
2407         int err;
2408
2409         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2410
2411         pr_info("Open vSwitch switching datapath\n");
2412
2413         err = action_fifos_init();
2414         if (err)
2415                 goto error;
2416
2417         err = ovs_internal_dev_rtnl_link_register();
2418         if (err)
2419                 goto error_action_fifos_exit;
2420
2421         err = ovs_flow_init();
2422         if (err)
2423                 goto error_unreg_rtnl_link;
2424
2425         err = ovs_vport_init();
2426         if (err)
2427                 goto error_flow_exit;
2428
2429         err = register_pernet_device(&ovs_net_ops);
2430         if (err)
2431                 goto error_vport_exit;
2432
2433         err = register_netdevice_notifier(&ovs_dp_device_notifier);
2434         if (err)
2435                 goto error_netns_exit;
2436
2437         err = ovs_netdev_init();
2438         if (err)
2439                 goto error_unreg_notifier;
2440
2441         err = dp_register_genl();
2442         if (err < 0)
2443                 goto error_unreg_netdev;
2444
2445         return 0;
2446
2447 error_unreg_netdev:
2448         ovs_netdev_exit();
2449 error_unreg_notifier:
2450         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2451 error_netns_exit:
2452         unregister_pernet_device(&ovs_net_ops);
2453 error_vport_exit:
2454         ovs_vport_exit();
2455 error_flow_exit:
2456         ovs_flow_exit();
2457 error_unreg_rtnl_link:
2458         ovs_internal_dev_rtnl_link_unregister();
2459 error_action_fifos_exit:
2460         action_fifos_exit();
2461 error:
2462         return err;
2463 }
2464
2465 static void dp_cleanup(void)
2466 {
2467         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2468         ovs_netdev_exit();
2469         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2470         unregister_pernet_device(&ovs_net_ops);
2471         rcu_barrier();
2472         ovs_vport_exit();
2473         ovs_flow_exit();
2474         ovs_internal_dev_rtnl_link_unregister();
2475         action_fifos_exit();
2476 }
2477
2478 module_init(dp_init);
2479 module_exit(dp_cleanup);
2480
2481 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2482 MODULE_LICENSE("GPL");
2483 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2484 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2485 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2486 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2487 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
2488 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);