net/openvswitch/datapath.c

   1 /*
   2  * Copyright (c) 2007-2014 Nicira, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of version 2 of the GNU General Public
   6  * License as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  16  * 02110-1301, USA
  17  */
  18
  19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  20
  21 #include <linux/init.h>
  22 #include <linux/module.h>
  23 #include <linux/if_arp.h>
  24 #include <linux/if_vlan.h>
  25 #include <linux/in.h>
  26 #include <linux/ip.h>
  27 #include <linux/jhash.h>
  28 #include <linux/delay.h>
  29 #include <linux/time.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/genetlink.h>
  32 #include <linux/kernel.h>
  33 #include <linux/kthread.h>
  34 #include <linux/mutex.h>
  35 #include <linux/percpu.h>
  36 #include <linux/rcupdate.h>
  37 #include <linux/tcp.h>
  38 #include <linux/udp.h>
  39 #include <linux/ethtool.h>
  40 #include <linux/wait.h>
  41 #include <asm/div64.h>
  42 #include <linux/highmem.h>
  43 #include <linux/netfilter_bridge.h>
  44 #include <linux/netfilter_ipv4.h>
  45 #include <linux/inetdevice.h>
  46 #include <linux/list.h>
  47 #include <linux/openvswitch.h>
  48 #include <linux/rculist.h>
  49 #include <linux/dmi.h>
  50 #include <net/genetlink.h>
  51 #include <net/net_namespace.h>
  52 #include <net/netns/generic.h>
  53
  54 #include "datapath.h"
  55 #include "flow.h"
  56 #include "flow_table.h"
  57 #include "flow_netlink.h"
  58 #include "vport-internal_dev.h"
  59 #include "vport-netdev.h"
  60
  61 int ovs_net_id __read_mostly;
  62 EXPORT_SYMBOL_GPL(ovs_net_id);
  63
  64 static struct genl_family dp_packet_genl_family;
  65 static struct genl_family dp_flow_genl_family;
  66 static struct genl_family dp_datapath_genl_family;
  67
  68 static const struct 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, genl_info_net(info), info->snd_portid,
  95                     0, info->nlhdr, GFP_KERNEL);
  96 }
  97
  98 /**
  99  * DOC: Locking:
 100  *
 101  * All writes e.g. Writes to device state (add/remove datapath, port, set
 102  * operations on vports, etc.), Writes to other state (flow table
 103  * modifications, set miscellaneous datapath parameters, etc.) are protected
 104  * by ovs_lock.
 105  *
 106  * Reads are protected by RCU.
 107  *
 108  * There are a few special cases (mostly stats) that have their own
 109  * synchronization but they nest under all of above and don't interact with
 110  * each other.
 111  *
 112  * The RTNL lock nests inside ovs_mutex.
 113  */
 114
 115 static DEFINE_MUTEX(ovs_mutex);
 116
 117 void ovs_lock(void)
 118 {
 119         mutex_lock(&ovs_mutex);
 120 }
 121
 122 void ovs_unlock(void)
 123 {
 124         mutex_unlock(&ovs_mutex);
 125 }
 126
 127 #ifdef CONFIG_LOCKDEP
 128 int lockdep_ovsl_is_held(void)
 129 {
 130         if (debug_locks)
 131                 return lockdep_is_held(&ovs_mutex);
 132         else
 133                 return 1;
 134 }
 135 EXPORT_SYMBOL_GPL(lockdep_ovsl_is_held);
 136 #endif
 137
 138 static struct vport *new_vport(const struct vport_parms *);
 139 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
 140                              const struct sw_flow_key *,
 141                              const struct dp_upcall_info *);
 142 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
 143                                   const struct sw_flow_key *,
 144                                   const struct dp_upcall_info *);
 145
 146 /* Must be called with rcu_read_lock. */
 147 static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
 148 {
 149         struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
 150
 151         if (dev) {
 152                 struct vport *vport = ovs_internal_dev_get_vport(dev);
 153                 if (vport)
 154                         return vport->dp;
 155         }
 156
 157         return NULL;
 158 }
 159
 160 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the
 161  * returned dp pointer valid.
 162  */
 163 static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
 164 {
 165         struct datapath *dp;
 166
 167         WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
 168         rcu_read_lock();
 169         dp = get_dp_rcu(net, dp_ifindex);
 170         rcu_read_unlock();
 171
 172         return dp;
 173 }
 174
 175 /* Must be called with rcu_read_lock or ovs_mutex. */
 176 const char *ovs_dp_name(const struct datapath *dp)
 177 {
 178         struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
 179         return vport->ops->get_name(vport);
 180 }
 181
 182 static int get_dpifindex(const struct datapath *dp)
 183 {
 184         struct vport *local;
 185         int ifindex;
 186
 187         rcu_read_lock();
 188
 189         local = ovs_vport_rcu(dp, OVSP_LOCAL);
 190         if (local)
 191                 ifindex = netdev_vport_priv(local)->dev->ifindex;
 192         else
 193                 ifindex = 0;
 194
 195         rcu_read_unlock();
 196
 197         return ifindex;
 198 }
 199
 200 static void destroy_dp_rcu(struct rcu_head *rcu)
 201 {
 202         struct datapath *dp = container_of(rcu, struct datapath, rcu);
 203
 204         ovs_flow_tbl_destroy(&dp->table);
 205         free_percpu(dp->stats_percpu);
 206         release_net(ovs_dp_get_net(dp));
 207         kfree(dp->ports);
 208         kfree(dp);
 209 }
 210
 211 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
 212                                             u16 port_no)
 213 {
 214         return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
 215 }
 216
 217 /* Called with ovs_mutex or RCU read lock. */
 218 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
 219 {
 220         struct vport *vport;
 221         struct hlist_head *head;
 222
 223         head = vport_hash_bucket(dp, port_no);
 224         hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
 225                 if (vport->port_no == port_no)
 226                         return vport;
 227         }
 228         return NULL;
 229 }
 230
 231 /* Called with ovs_mutex. */
 232 static struct vport *new_vport(const struct vport_parms *parms)
 233 {
 234         struct vport *vport;
 235
 236         vport = ovs_vport_add(parms);
 237         if (!IS_ERR(vport)) {
 238                 struct datapath *dp = parms->dp;
 239                 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
 240
 241                 hlist_add_head_rcu(&vport->dp_hash_node, head);
 242         }
 243         return vport;
 244 }
 245
 246 void ovs_dp_detach_port(struct vport *p)
 247 {
 248         ASSERT_OVSL();
 249
 250         /* First drop references to device. */
 251         hlist_del_rcu(&p->dp_hash_node);
 252
 253         /* Then destroy it. */
 254         ovs_vport_del(p);
 255 }
 256
 257 /* Must be called with rcu_read_lock. */
 258 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
 259 {
 260         const struct vport *p = OVS_CB(skb)->input_vport;
 261         struct datapath *dp = p->dp;
 262         struct sw_flow *flow;
 263         struct sw_flow_actions *sf_acts;
 264         struct dp_stats_percpu *stats;
 265         u64 *stats_counter;
 266         u32 n_mask_hit;
 267
 268         stats = this_cpu_ptr(dp->stats_percpu);
 269
 270         /* Look up flow. */
 271         flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
 272         if (unlikely(!flow)) {
 273                 struct dp_upcall_info upcall;
 274                 int error;
 275
 276                 upcall.cmd = OVS_PACKET_CMD_MISS;
 277                 upcall.userdata = NULL;
 278                 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
 279                 upcall.egress_tun_info = NULL;
 280                 error = ovs_dp_upcall(dp, skb, key, &upcall);
 281                 if (unlikely(error))
 282                         kfree_skb(skb);
 283                 else
 284                         consume_skb(skb);
 285                 stats_counter = &stats->n_missed;
 286                 goto out;
 287         }
 288
 289         ovs_flow_stats_update(flow, key->tp.flags, skb);
 290         sf_acts = rcu_dereference(flow->sf_acts);
 291         ovs_execute_actions(dp, skb, sf_acts, key);
 292
 293         stats_counter = &stats->n_hit;
 294
 295 out:
 296         /* Update datapath statistics. */
 297         u64_stats_update_begin(&stats->syncp);
 298         (*stats_counter)++;
 299         stats->n_mask_hit += n_mask_hit;
 300         u64_stats_update_end(&stats->syncp);
 301 }
 302
 303 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
 304                   const struct sw_flow_key *key,
 305                   const struct dp_upcall_info *upcall_info)
 306 {
 307         struct dp_stats_percpu *stats;
 308         int err;
 309
 310         if (upcall_info->portid == 0) {
 311                 err = -ENOTCONN;
 312                 goto err;
 313         }
 314
 315         if (!skb_is_gso(skb))
 316                 err = queue_userspace_packet(dp, skb, key, upcall_info);
 317         else
 318                 err = queue_gso_packets(dp, skb, key, upcall_info);
 319         if (err)
 320                 goto err;
 321
 322         return 0;
 323
 324 err:
 325         stats = this_cpu_ptr(dp->stats_percpu);
 326
 327         u64_stats_update_begin(&stats->syncp);
 328         stats->n_lost++;
 329         u64_stats_update_end(&stats->syncp);
 330
 331         return err;
 332 }
 333
 334 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
 335                              const struct sw_flow_key *key,
 336                              const struct dp_upcall_info *upcall_info)
 337 {
 338         unsigned short gso_type = skb_shinfo(skb)->gso_type;
 339         struct sw_flow_key later_key;
 340         struct sk_buff *segs, *nskb;
 341         struct ovs_skb_cb ovs_cb;
 342         int err;
 343
 344         ovs_cb = *OVS_CB(skb);
 345         segs = __skb_gso_segment(skb, NETIF_F_SG, false);
 346         *OVS_CB(skb) = ovs_cb;
 347         if (IS_ERR(segs))
 348                 return PTR_ERR(segs);
 349         if (segs == NULL)
 350                 return -EINVAL;
 351
 352         if (gso_type & SKB_GSO_UDP) {
 353                 /* The initial flow key extracted by ovs_flow_key_extract()
 354                  * in this case is for a first fragment, so we need to
 355                  * properly mark later fragments.
 356                  */
 357                 later_key = *key;
 358                 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
 359         }
 360
 361         /* Queue all of the segments. */
 362         skb = segs;
 363         do {
 364                 *OVS_CB(skb) = ovs_cb;
 365                 if (gso_type & SKB_GSO_UDP && skb != segs)
 366                         key = &later_key;
 367
 368                 err = queue_userspace_packet(dp, skb, key, upcall_info);
 369                 if (err)
 370                         break;
 371
 372         } while ((skb = skb->next));
 373
 374         /* Free all of the segments. */
 375         skb = segs;
 376         do {
 377                 nskb = skb->next;
 378                 if (err)
 379                         kfree_skb(skb);
 380                 else
 381                         consume_skb(skb);
 382         } while ((skb = nskb));
 383         return err;
 384 }
 385
 386 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
 387                               unsigned int hdrlen)
 388 {
 389         size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
 390                 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
 391                 + nla_total_size(ovs_key_attr_size()); /* OVS_PACKET_ATTR_KEY */
 392
 393         /* OVS_PACKET_ATTR_USERDATA */
 394         if (upcall_info->userdata)
 395                 size += NLA_ALIGN(upcall_info->userdata->nla_len);
 396
 397         /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
 398         if (upcall_info->egress_tun_info)
 399                 size += nla_total_size(ovs_tun_key_attr_size());
 400
 401         return size;
 402 }
 403
 404 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
 405                                   const struct sw_flow_key *key,
 406                                   const struct dp_upcall_info *upcall_info)
 407 {
 408         struct ovs_header *upcall;
 409         struct sk_buff *nskb = NULL;
 410         struct sk_buff *user_skb = NULL; /* to be queued to userspace */
 411         struct nlattr *nla;
 412         struct genl_info info = {
 413                 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
 414                 .snd_portid = upcall_info->portid,
 415         };
 416         size_t len;
 417         unsigned int hlen;
 418         int err, dp_ifindex;
 419
 420         dp_ifindex = get_dpifindex(dp);
 421         if (!dp_ifindex)
 422                 return -ENODEV;
 423
 424         if (skb_vlan_tag_present(skb)) {
 425                 nskb = skb_clone(skb, GFP_ATOMIC);
 426                 if (!nskb)
 427                         return -ENOMEM;
 428
 429                 nskb = __vlan_hwaccel_push_inside(nskb);
 430                 if (!nskb)
 431                         return -ENOMEM;
 432
 433                 skb = nskb;
 434         }
 435
 436         if (nla_attr_size(skb->len) > USHRT_MAX) {
 437                 err = -EFBIG;
 438                 goto out;
 439         }
 440
 441         /* Complete checksum if needed */
 442         if (skb->ip_summed == CHECKSUM_PARTIAL &&
 443             (err = skb_checksum_help(skb)))
 444                 goto out;
 445
 446         /* Older versions of OVS user space enforce alignment of the last
 447          * Netlink attribute to NLA_ALIGNTO which would require extensive
 448          * padding logic. Only perform zerocopy if padding is not required.
 449          */
 450         if (dp->user_features & OVS_DP_F_UNALIGNED)
 451                 hlen = skb_zerocopy_headlen(skb);
 452         else
 453                 hlen = skb->len;
 454
 455         len = upcall_msg_size(upcall_info, hlen);
 456         user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
 457         if (!user_skb) {
 458                 err = -ENOMEM;
 459                 goto out;
 460         }
 461
 462         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
 463                              0, upcall_info->cmd);
 464         upcall->dp_ifindex = dp_ifindex;
 465
 466         err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
 467         BUG_ON(err);
 468
 469         if (upcall_info->userdata)
 470                 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
 471                           nla_len(upcall_info->userdata),
 472                           nla_data(upcall_info->userdata));
 473
 474         if (upcall_info->egress_tun_info) {
 475                 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
 476                 err = ovs_nla_put_egress_tunnel_key(user_skb,
 477                                                     upcall_info->egress_tun_info);
 478                 BUG_ON(err);
 479                 nla_nest_end(user_skb, nla);
 480         }
 481
 482         /* Only reserve room for attribute header, packet data is added
 483          * in skb_zerocopy() */
 484         if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
 485                 err = -ENOBUFS;
 486                 goto out;
 487         }
 488         nla->nla_len = nla_attr_size(skb->len);
 489
 490         err = skb_zerocopy(user_skb, skb, skb->len, hlen);
 491         if (err)
 492                 goto out;
 493
 494         /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
 495         if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
 496                 size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len;
 497
 498                 if (plen > 0)
 499                         memset(skb_put(user_skb, plen), 0, plen);
 500         }
 501
 502         ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
 503
 504         err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
 505         user_skb = NULL;
 506 out:
 507         if (err)
 508                 skb_tx_error(skb);
 509         kfree_skb(user_skb);
 510         kfree_skb(nskb);
 511         return err;
 512 }
 513
 514 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 515 {
 516         struct ovs_header *ovs_header = info->userhdr;
 517         struct nlattr **a = info->attrs;
 518         struct sw_flow_actions *acts;
 519         struct sk_buff *packet;
 520         struct sw_flow *flow;
 521         struct sw_flow_actions *sf_acts;
 522         struct datapath *dp;
 523         struct ethhdr *eth;
 524         struct vport *input_vport;
 525         int len;
 526         int err;
 527         bool log = !a[OVS_PACKET_ATTR_PROBE];
 528
 529         err = -EINVAL;
 530         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 531             !a[OVS_PACKET_ATTR_ACTIONS])
 532                 goto err;
 533
 534         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 535         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 536         err = -ENOMEM;
 537         if (!packet)
 538                 goto err;
 539         skb_reserve(packet, NET_IP_ALIGN);
 540
 541         nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
 542
 543         skb_reset_mac_header(packet);
 544         eth = eth_hdr(packet);
 545
 546         /* Normally, setting the skb 'protocol' field would be handled by a
 547          * call to eth_type_trans(), but it assumes there's a sending
 548          * device, which we may not have. */
 549         if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
 550                 packet->protocol = eth->h_proto;
 551         else
 552                 packet->protocol = htons(ETH_P_802_2);
 553
 554         /* Build an sw_flow for sending this packet. */
 555         flow = ovs_flow_alloc();
 556         err = PTR_ERR(flow);
 557         if (IS_ERR(flow))
 558                 goto err_kfree_skb;
 559
 560         err = ovs_flow_key_extract_userspace(a[OVS_PACKET_ATTR_KEY], packet,
 561                                              &flow->key, log);
 562         if (err)
 563                 goto err_flow_free;
 564
 565         err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
 566                                    &flow->key, &acts, log);
 567         if (err)
 568                 goto err_flow_free;
 569
 570         rcu_assign_pointer(flow->sf_acts, acts);
 571         OVS_CB(packet)->egress_tun_info = NULL;
 572         packet->priority = flow->key.phy.priority;
 573         packet->mark = flow->key.phy.skb_mark;
 574
 575         rcu_read_lock();
 576         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
 577         err = -ENODEV;
 578         if (!dp)
 579                 goto err_unlock;
 580
 581         input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
 582         if (!input_vport)
 583                 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
 584
 585         if (!input_vport)
 586                 goto err_unlock;
 587
 588         OVS_CB(packet)->input_vport = input_vport;
 589         sf_acts = rcu_dereference(flow->sf_acts);
 590
 591         local_bh_disable();
 592         err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
 593         local_bh_enable();
 594         rcu_read_unlock();
 595
 596         ovs_flow_free(flow, false);
 597         return err;
 598
 599 err_unlock:
 600         rcu_read_unlock();
 601 err_flow_free:
 602         ovs_flow_free(flow, false);
 603 err_kfree_skb:
 604         kfree_skb(packet);
 605 err:
 606         return err;
 607 }
 608
 609 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 610         [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
 611         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 612         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 613         [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
 614 };
 615
 616 static const struct genl_ops dp_packet_genl_ops[] = {
 617         { .cmd = OVS_PACKET_CMD_EXECUTE,
 618           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 619           .policy = packet_policy,
 620           .doit = ovs_packet_cmd_execute
 621         }
 622 };
 623
 624 static struct genl_family dp_packet_genl_family = {
 625         .id = GENL_ID_GENERATE,
 626         .hdrsize = sizeof(struct ovs_header),
 627         .name = OVS_PACKET_FAMILY,
 628         .version = OVS_PACKET_VERSION,
 629         .maxattr = OVS_PACKET_ATTR_MAX,
 630         .netnsok = true,
 631         .parallel_ops = true,
 632         .ops = dp_packet_genl_ops,
 633         .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
 634 };
 635
 636 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
 637                          struct ovs_dp_megaflow_stats *mega_stats)
 638 {
 639         int i;
 640
 641         memset(mega_stats, 0, sizeof(*mega_stats));
 642
 643         stats->n_flows = ovs_flow_tbl_count(&dp->table);
 644         mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
 645
 646         stats->n_hit = stats->n_missed = stats->n_lost = 0;
 647
 648         for_each_possible_cpu(i) {
 649                 const struct dp_stats_percpu *percpu_stats;
 650                 struct dp_stats_percpu local_stats;
 651                 unsigned int start;
 652
 653                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 654
 655                 do {
 656                         start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
 657                         local_stats = *percpu_stats;
 658                 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
 659
 660                 stats->n_hit += local_stats.n_hit;
 661                 stats->n_missed += local_stats.n_missed;
 662                 stats->n_lost += local_stats.n_lost;
 663                 mega_stats->n_mask_hit += local_stats.n_mask_hit;
 664         }
 665 }
 666
 667 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
 668 {
 669         return ovs_identifier_is_ufid(sfid) &&
 670                !(ufid_flags & OVS_UFID_F_OMIT_KEY);
 671 }
 672
 673 static bool should_fill_mask(uint32_t ufid_flags)
 674 {
 675         return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
 676 }
 677
 678 static bool should_fill_actions(uint32_t ufid_flags)
 679 {
 680         return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
 681 }
 682
 683 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
 684                                     const struct sw_flow_id *sfid,
 685                                     uint32_t ufid_flags)
 686 {
 687         size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
 688
 689         /* OVS_FLOW_ATTR_UFID */
 690         if (sfid && ovs_identifier_is_ufid(sfid))
 691                 len += nla_total_size(sfid->ufid_len);
 692
 693         /* OVS_FLOW_ATTR_KEY */
 694         if (!sfid || should_fill_key(sfid, ufid_flags))
 695                 len += nla_total_size(ovs_key_attr_size());
 696
 697         /* OVS_FLOW_ATTR_MASK */
 698         if (should_fill_mask(ufid_flags))
 699                 len += nla_total_size(ovs_key_attr_size());
 700
 701         /* OVS_FLOW_ATTR_ACTIONS */
 702         if (should_fill_actions(ufid_flags))
 703                 len += nla_total_size(acts->actions_len);
 704
 705         return len
 706                 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
 707                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
 708                 + nla_total_size(8); /* OVS_FLOW_ATTR_USED */
 709 }
 710
 711 /* Called with ovs_mutex or RCU read lock. */
 712 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
 713                                    struct sk_buff *skb)
 714 {
 715         struct ovs_flow_stats stats;
 716         __be16 tcp_flags;
 717         unsigned long used;
 718
 719         ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
 720
 721         if (used &&
 722             nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
 723                 return -EMSGSIZE;
 724
 725         if (stats.n_packets &&
 726             nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
 727                 return -EMSGSIZE;
 728
 729         if ((u8)ntohs(tcp_flags) &&
 730              nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
 731                 return -EMSGSIZE;
 732
 733         return 0;
 734 }
 735
 736 /* Called with ovs_mutex or RCU read lock. */
 737 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
 738                                      struct sk_buff *skb, int skb_orig_len)
 739 {
 740         struct nlattr *start;
 741         int err;
 742
 743         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 744          * this is the first flow to be dumped into 'skb'.  This is unusual for
 745          * Netlink but individual action lists can be longer than
 746          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 747          * The userspace caller can always fetch the actions separately if it
 748          * really wants them.  (Most userspace callers in fact don't care.)
 749          *
 750          * This can only fail for dump operations because the skb is always
 751          * properly sized for single flows.
 752          */
 753         start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
 754         if (start) {
 755                 const struct sw_flow_actions *sf_acts;
 756
 757                 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
 758                 err = ovs_nla_put_actions(sf_acts->actions,
 759                                           sf_acts->actions_len, skb);
 760
 761                 if (!err)
 762                         nla_nest_end(skb, start);
 763                 else {
 764                         if (skb_orig_len)
 765                                 return err;
 766
 767                         nla_nest_cancel(skb, start);
 768                 }
 769         } else if (skb_orig_len) {
 770                 return -EMSGSIZE;
 771         }
 772
 773         return 0;
 774 }
 775
 776 /* Called with ovs_mutex or RCU read lock. */
 777 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
 778                                   struct sk_buff *skb, u32 portid,
 779                                   u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
 780 {
 781         const int skb_orig_len = skb->len;
 782         struct ovs_header *ovs_header;
 783         int err;
 784
 785         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
 786                                  flags, cmd);
 787         if (!ovs_header)
 788                 return -EMSGSIZE;
 789
 790         ovs_header->dp_ifindex = dp_ifindex;
 791
 792         err = ovs_nla_put_identifier(flow, skb);
 793         if (err)
 794                 goto error;
 795
 796         if (should_fill_key(&flow->id, ufid_flags)) {
 797                 err = ovs_nla_put_masked_key(flow, skb);
 798                 if (err)
 799                         goto error;
 800         }
 801
 802         if (should_fill_mask(ufid_flags)) {
 803                 err = ovs_nla_put_mask(flow, skb);
 804                 if (err)
 805                         goto error;
 806         }
 807
 808         err = ovs_flow_cmd_fill_stats(flow, skb);
 809         if (err)
 810                 goto error;
 811
 812         if (should_fill_actions(ufid_flags)) {
 813                 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
 814                 if (err)
 815                         goto error;
 816         }
 817
 818         genlmsg_end(skb, ovs_header);
 819         return 0;
 820
 821 error:
 822         genlmsg_cancel(skb, ovs_header);
 823         return err;
 824 }
 825
 826 /* May not be called with RCU read lock. */
 827 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
 828                                                const struct sw_flow_id *sfid,
 829                                                struct genl_info *info,
 830                                                bool always,
 831                                                uint32_t ufid_flags)
 832 {
 833         struct sk_buff *skb;
 834         size_t len;
 835
 836         if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
 837                 return NULL;
 838
 839         len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
 840         skb = genlmsg_new_unicast(len, info, GFP_KERNEL);
 841         if (!skb)
 842                 return ERR_PTR(-ENOMEM);
 843
 844         return skb;
 845 }
 846
 847 /* Called with ovs_mutex. */
 848 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
 849                                                int dp_ifindex,
 850                                                struct genl_info *info, u8 cmd,
 851                                                bool always, u32 ufid_flags)
 852 {
 853         struct sk_buff *skb;
 854         int retval;
 855
 856         skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
 857                                       &flow->id, info, always, ufid_flags);
 858         if (IS_ERR_OR_NULL(skb))
 859                 return skb;
 860
 861         retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
 862                                         info->snd_portid, info->snd_seq, 0,
 863                                         cmd, ufid_flags);
 864         BUG_ON(retval < 0);
 865         return skb;
 866 }
 867
 868 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
 869 {
 870         struct nlattr **a = info->attrs;
 871         struct ovs_header *ovs_header = info->userhdr;
 872         struct sw_flow *flow = NULL, *new_flow;
 873         struct sw_flow_mask mask;
 874         struct sk_buff *reply;
 875         struct datapath *dp;
 876         struct sw_flow_key key;
 877         struct sw_flow_actions *acts;
 878         struct sw_flow_match match;
 879         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
 880         int error;
 881         bool log = !a[OVS_FLOW_ATTR_PROBE];
 882
 883         /* Must have key and actions. */
 884         error = -EINVAL;
 885         if (!a[OVS_FLOW_ATTR_KEY]) {
 886                 OVS_NLERR(log, "Flow key attr not present in new flow.");
 887                 goto error;
 888         }
 889         if (!a[OVS_FLOW_ATTR_ACTIONS]) {
 890                 OVS_NLERR(log, "Flow actions attr not present in new flow.");
 891                 goto error;
 892         }
 893
 894         /* Most of the time we need to allocate a new flow, do it before
 895          * locking.
 896          */
 897         new_flow = ovs_flow_alloc();
 898         if (IS_ERR(new_flow)) {
 899                 error = PTR_ERR(new_flow);
 900                 goto error;
 901         }
 902
 903         /* Extract key. */
 904         ovs_match_init(&match, &key, &mask);
 905         error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY],
 906                                   a[OVS_FLOW_ATTR_MASK], log);
 907         if (error)
 908                 goto err_kfree_flow;
 909
 910         ovs_flow_mask_key(&new_flow->key, &key, &mask);
 911
 912         /* Extract flow identifier. */
 913         error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
 914                                        &key, log);
 915         if (error)
 916                 goto err_kfree_flow;
 917
 918         /* Validate actions. */
 919         error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &new_flow->key,
 920                                      &acts, log);
 921         if (error) {
 922                 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
 923                 goto err_kfree_flow;
 924         }
 925
 926         reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
 927                                         ufid_flags);
 928         if (IS_ERR(reply)) {
 929                 error = PTR_ERR(reply);
 930                 goto err_kfree_acts;
 931         }
 932
 933         ovs_lock();
 934         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 935         if (unlikely(!dp)) {
 936                 error = -ENODEV;
 937                 goto err_unlock_ovs;
 938         }
 939
 940         /* Check if this is a duplicate flow */
 941         if (ovs_identifier_is_ufid(&new_flow->id))
 942                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
 943         if (!flow)
 944                 flow = ovs_flow_tbl_lookup(&dp->table, &key);
 945         if (likely(!flow)) {
 946                 rcu_assign_pointer(new_flow->sf_acts, acts);
 947
 948                 /* Put flow in bucket. */
 949                 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
 950                 if (unlikely(error)) {
 951                         acts = NULL;
 952                         goto err_unlock_ovs;
 953                 }
 954
 955                 if (unlikely(reply)) {
 956                         error = ovs_flow_cmd_fill_info(new_flow,
 957                                                        ovs_header->dp_ifindex,
 958                                                        reply, info->snd_portid,
 959                                                        info->snd_seq, 0,
 960                                                        OVS_FLOW_CMD_NEW,
 961                                                        ufid_flags);
 962                         BUG_ON(error < 0);
 963                 }
 964                 ovs_unlock();
 965         } else {
 966                 struct sw_flow_actions *old_acts;
 967
 968                 /* Bail out if we're not allowed to modify an existing flow.
 969                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
 970                  * because Generic Netlink treats the latter as a dump
 971                  * request.  We also accept NLM_F_EXCL in case that bug ever
 972                  * gets fixed.
 973                  */
 974                 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
 975                                                          | NLM_F_EXCL))) {
 976                         error = -EEXIST;
 977                         goto err_unlock_ovs;
 978                 }
 979                 /* The flow identifier has to be the same for flow updates.
 980                  * Look for any overlapping flow.
 981                  */
 982                 if (unlikely(!ovs_flow_cmp(flow, &match))) {
 983                         if (ovs_identifier_is_key(&flow->id))
 984                                 flow = ovs_flow_tbl_lookup_exact(&dp->table,
 985                                                                  &match);
 986                         else /* UFID matches but key is different */
 987                                 flow = NULL;
 988                         if (!flow) {
 989                                 error = -ENOENT;
 990                                 goto err_unlock_ovs;
 991                         }
 992                 }
 993                 /* Update actions. */
 994                 old_acts = ovsl_dereference(flow->sf_acts);
 995                 rcu_assign_pointer(flow->sf_acts, acts);
 996
 997                 if (unlikely(reply)) {
 998                         error = ovs_flow_cmd_fill_info(flow,
 999                                                        ovs_header->dp_ifindex,
1000                                                        reply, info->snd_portid,
1001                                                        info->snd_seq, 0,
1002                                                        OVS_FLOW_CMD_NEW,
1003                                                        ufid_flags);
1004                         BUG_ON(error < 0);
1005                 }
1006                 ovs_unlock();
1007
1008                 ovs_nla_free_flow_actions(old_acts);
1009                 ovs_flow_free(new_flow, false);
1010         }
1011
1012         if (reply)
1013                 ovs_notify(&dp_flow_genl_family, reply, info);
1014         return 0;
1015
1016 err_unlock_ovs:
1017         ovs_unlock();
1018         kfree_skb(reply);
1019 err_kfree_acts:
1020         kfree(acts);
1021 err_kfree_flow:
1022         ovs_flow_free(new_flow, false);
1023 error:
1024         return error;
1025 }
1026
1027 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1028 static struct sw_flow_actions *get_flow_actions(const struct nlattr *a,
1029                                                 const struct sw_flow_key *key,
1030                                                 const struct sw_flow_mask *mask,
1031                                                 bool log)
1032 {
1033         struct sw_flow_actions *acts;
1034         struct sw_flow_key masked_key;
1035         int error;
1036
1037         ovs_flow_mask_key(&masked_key, key, mask);
1038         error = ovs_nla_copy_actions(a, &masked_key, &acts, log);
1039         if (error) {
1040                 OVS_NLERR(log,
1041                           "Actions may not be safe on all matching packets");
1042                 return ERR_PTR(error);
1043         }
1044
1045         return acts;
1046 }
1047
1048 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1049 {
1050         struct nlattr **a = info->attrs;
1051         struct ovs_header *ovs_header = info->userhdr;
1052         struct sw_flow_key key;
1053         struct sw_flow *flow;
1054         struct sw_flow_mask mask;
1055         struct sk_buff *reply = NULL;
1056         struct datapath *dp;
1057         struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1058         struct sw_flow_match match;
1059         struct sw_flow_id sfid;
1060         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1061         int error;
1062         bool log = !a[OVS_FLOW_ATTR_PROBE];
1063         bool ufid_present;
1064
1065         /* Extract key. */
1066         error = -EINVAL;
1067         if (!a[OVS_FLOW_ATTR_KEY]) {
1068                 OVS_NLERR(log, "Flow key attribute not present in set flow.");
1069                 goto error;
1070         }
1071
1072         ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1073         ovs_match_init(&match, &key, &mask);
1074         error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY],
1075                                   a[OVS_FLOW_ATTR_MASK], log);
1076         if (error)
1077                 goto error;
1078
1079         /* Validate actions. */
1080         if (a[OVS_FLOW_ATTR_ACTIONS]) {
1081                 acts = get_flow_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, &mask,
1082                                         log);
1083                 if (IS_ERR(acts)) {
1084                         error = PTR_ERR(acts);
1085                         goto error;
1086                 }
1087
1088                 /* Can allocate before locking if have acts. */
1089                 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1090                                                 ufid_flags);
1091                 if (IS_ERR(reply)) {
1092                         error = PTR_ERR(reply);
1093                         goto err_kfree_acts;
1094                 }
1095         }
1096
1097         ovs_lock();
1098         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1099         if (unlikely(!dp)) {
1100                 error = -ENODEV;
1101                 goto err_unlock_ovs;
1102         }
1103         /* Check that the flow exists. */
1104         if (ufid_present)
1105                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1106         else
1107                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1108         if (unlikely(!flow)) {
1109                 error = -ENOENT;
1110                 goto err_unlock_ovs;
1111         }
1112
1113         /* Update actions, if present. */
1114         if (likely(acts)) {
1115                 old_acts = ovsl_dereference(flow->sf_acts);
1116                 rcu_assign_pointer(flow->sf_acts, acts);
1117
1118                 if (unlikely(reply)) {
1119                         error = ovs_flow_cmd_fill_info(flow,
1120                                                        ovs_header->dp_ifindex,
1121                                                        reply, info->snd_portid,
1122                                                        info->snd_seq, 0,
1123                                                        OVS_FLOW_CMD_NEW,
1124                                                        ufid_flags);
1125                         BUG_ON(error < 0);
1126                 }
1127         } else {
1128                 /* Could not alloc without acts before locking. */
1129                 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1130                                                 info, OVS_FLOW_CMD_NEW, false,
1131                                                 ufid_flags);
1132
1133                 if (unlikely(IS_ERR(reply))) {
1134                         error = PTR_ERR(reply);
1135                         goto err_unlock_ovs;
1136                 }
1137         }
1138
1139         /* Clear stats. */
1140         if (a[OVS_FLOW_ATTR_CLEAR])
1141                 ovs_flow_stats_clear(flow);
1142         ovs_unlock();
1143
1144         if (reply)
1145                 ovs_notify(&dp_flow_genl_family, reply, info);
1146         if (old_acts)
1147                 ovs_nla_free_flow_actions(old_acts);
1148
1149         return 0;
1150
1151 err_unlock_ovs:
1152         ovs_unlock();
1153         kfree_skb(reply);
1154 err_kfree_acts:
1155         kfree(acts);
1156 error:
1157         return error;
1158 }
1159
1160 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1161 {
1162         struct nlattr **a = info->attrs;
1163         struct ovs_header *ovs_header = info->userhdr;
1164         struct sw_flow_key key;
1165         struct sk_buff *reply;
1166         struct sw_flow *flow;
1167         struct datapath *dp;
1168         struct sw_flow_match match;
1169         struct sw_flow_id ufid;
1170         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1171         int err = 0;
1172         bool log = !a[OVS_FLOW_ATTR_PROBE];
1173         bool ufid_present;
1174
1175         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1176         if (a[OVS_FLOW_ATTR_KEY]) {
1177                 ovs_match_init(&match, &key, NULL);
1178                 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL,
1179                                         log);
1180         } else if (!ufid_present) {
1181                 OVS_NLERR(log,
1182                           "Flow get message rejected, Key attribute missing.");
1183                 err = -EINVAL;
1184         }
1185         if (err)
1186                 return err;
1187
1188         ovs_lock();
1189         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1190         if (!dp) {
1191                 err = -ENODEV;
1192                 goto unlock;
1193         }
1194
1195         if (ufid_present)
1196                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1197         else
1198                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1199         if (!flow) {
1200                 err = -ENOENT;
1201                 goto unlock;
1202         }
1203
1204         reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1205                                         OVS_FLOW_CMD_NEW, true, ufid_flags);
1206         if (IS_ERR(reply)) {
1207                 err = PTR_ERR(reply);
1208                 goto unlock;
1209         }
1210
1211         ovs_unlock();
1212         return genlmsg_reply(reply, info);
1213 unlock:
1214         ovs_unlock();
1215         return err;
1216 }
1217
1218 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1219 {
1220         struct nlattr **a = info->attrs;
1221         struct ovs_header *ovs_header = info->userhdr;
1222         struct sw_flow_key key;
1223         struct sk_buff *reply;
1224         struct sw_flow *flow = NULL;
1225         struct datapath *dp;
1226         struct sw_flow_match match;
1227         struct sw_flow_id ufid;
1228         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1229         int err;
1230         bool log = !a[OVS_FLOW_ATTR_PROBE];
1231         bool ufid_present;
1232
1233         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1234         if (a[OVS_FLOW_ATTR_KEY]) {
1235                 ovs_match_init(&match, &key, NULL);
1236                 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL,
1237                                         log);
1238                 if (unlikely(err))
1239                         return err;
1240         }
1241
1242         ovs_lock();
1243         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1244         if (unlikely(!dp)) {
1245                 err = -ENODEV;
1246                 goto unlock;
1247         }
1248
1249         if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1250                 err = ovs_flow_tbl_flush(&dp->table);
1251                 goto unlock;
1252         }
1253
1254         if (ufid_present)
1255                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1256         else
1257                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1258         if (unlikely(!flow)) {
1259                 err = -ENOENT;
1260                 goto unlock;
1261         }
1262
1263         ovs_flow_tbl_remove(&dp->table, flow);
1264         ovs_unlock();
1265
1266         reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1267                                         &flow->id, info, false, ufid_flags);
1268         if (likely(reply)) {
1269                 if (likely(!IS_ERR(reply))) {
1270                         rcu_read_lock();        /*To keep RCU checker happy. */
1271                         err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1272                                                      reply, info->snd_portid,
1273                                                      info->snd_seq, 0,
1274                                                      OVS_FLOW_CMD_DEL,
1275                                                      ufid_flags);
1276                         rcu_read_unlock();
1277                         BUG_ON(err < 0);
1278
1279                         ovs_notify(&dp_flow_genl_family, reply, info);
1280                 } else {
1281                         netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1282                 }
1283         }
1284
1285         ovs_flow_free(flow, true);
1286         return 0;
1287 unlock:
1288         ovs_unlock();
1289         return err;
1290 }
1291
1292 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1293 {
1294         struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1295         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1296         struct table_instance *ti;
1297         struct datapath *dp;
1298         u32 ufid_flags;
1299         int err;
1300
1301         err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1302                             OVS_FLOW_ATTR_MAX, flow_policy);
1303         if (err)
1304                 return err;
1305         ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1306
1307         rcu_read_lock();
1308         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1309         if (!dp) {
1310                 rcu_read_unlock();
1311                 return -ENODEV;
1312         }
1313
1314         ti = rcu_dereference(dp->table.ti);
1315         for (;;) {
1316                 struct sw_flow *flow;
1317                 u32 bucket, obj;
1318
1319                 bucket = cb->args[0];
1320                 obj = cb->args[1];
1321                 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1322                 if (!flow)
1323                         break;
1324
1325                 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1326                                            NETLINK_CB(cb->skb).portid,
1327                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1328                                            OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1329                         break;
1330
1331                 cb->args[0] = bucket;
1332                 cb->args[1] = obj;
1333         }
1334         rcu_read_unlock();
1335         return skb->len;
1336 }
1337
1338 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1339         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1340         [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1341         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1342         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1343         [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1344         [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1345         [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1346 };
1347
1348 static const struct genl_ops dp_flow_genl_ops[] = {
1349         { .cmd = OVS_FLOW_CMD_NEW,
1350           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1351           .policy = flow_policy,
1352           .doit = ovs_flow_cmd_new
1353         },
1354         { .cmd = OVS_FLOW_CMD_DEL,
1355           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1356           .policy = flow_policy,
1357           .doit = ovs_flow_cmd_del
1358         },
1359         { .cmd = OVS_FLOW_CMD_GET,
1360           .flags = 0,               /* OK for unprivileged users. */
1361           .policy = flow_policy,
1362           .doit = ovs_flow_cmd_get,
1363           .dumpit = ovs_flow_cmd_dump
1364         },
1365         { .cmd = OVS_FLOW_CMD_SET,
1366           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1367           .policy = flow_policy,
1368           .doit = ovs_flow_cmd_set,
1369         },
1370 };
1371
1372 static struct genl_family dp_flow_genl_family = {
1373         .id = GENL_ID_GENERATE,
1374         .hdrsize = sizeof(struct ovs_header),
1375         .name = OVS_FLOW_FAMILY,
1376         .version = OVS_FLOW_VERSION,
1377         .maxattr = OVS_FLOW_ATTR_MAX,
1378         .netnsok = true,
1379         .parallel_ops = true,
1380         .ops = dp_flow_genl_ops,
1381         .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1382         .mcgrps = &ovs_dp_flow_multicast_group,
1383         .n_mcgrps = 1,
1384 };
1385
1386 static size_t ovs_dp_cmd_msg_size(void)
1387 {
1388         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1389
1390         msgsize += nla_total_size(IFNAMSIZ);
1391         msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1392         msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1393         msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1394
1395         return msgsize;
1396 }
1397
1398 /* Called with ovs_mutex. */
1399 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1400                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1401 {
1402         struct ovs_header *ovs_header;
1403         struct ovs_dp_stats dp_stats;
1404         struct ovs_dp_megaflow_stats dp_megaflow_stats;
1405         int err;
1406
1407         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1408                                    flags, cmd);
1409         if (!ovs_header)
1410                 goto error;
1411
1412         ovs_header->dp_ifindex = get_dpifindex(dp);
1413
1414         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1415         if (err)
1416                 goto nla_put_failure;
1417
1418         get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1419         if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1420                         &dp_stats))
1421                 goto nla_put_failure;
1422
1423         if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1424                         sizeof(struct ovs_dp_megaflow_stats),
1425                         &dp_megaflow_stats))
1426                 goto nla_put_failure;
1427
1428         if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1429                 goto nla_put_failure;
1430
1431         genlmsg_end(skb, ovs_header);
1432         return 0;
1433
1434 nla_put_failure:
1435         genlmsg_cancel(skb, ovs_header);
1436 error:
1437         return -EMSGSIZE;
1438 }
1439
1440 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1441 {
1442         return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1443 }
1444
1445 /* Called with rcu_read_lock or ovs_mutex. */
1446 static struct datapath *lookup_datapath(struct net *net,
1447                                         const struct ovs_header *ovs_header,
1448                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1449 {
1450         struct datapath *dp;
1451
1452         if (!a[OVS_DP_ATTR_NAME])
1453                 dp = get_dp(net, ovs_header->dp_ifindex);
1454         else {
1455                 struct vport *vport;
1456
1457                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1458                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1459         }
1460         return dp ? dp : ERR_PTR(-ENODEV);
1461 }
1462
1463 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1464 {
1465         struct datapath *dp;
1466
1467         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1468         if (IS_ERR(dp))
1469                 return;
1470
1471         WARN(dp->user_features, "Dropping previously announced user features\n");
1472         dp->user_features = 0;
1473 }
1474
1475 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1476 {
1477         if (a[OVS_DP_ATTR_USER_FEATURES])
1478                 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1479 }
1480
1481 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1482 {
1483         struct nlattr **a = info->attrs;
1484         struct vport_parms parms;
1485         struct sk_buff *reply;
1486         struct datapath *dp;
1487         struct vport *vport;
1488         struct ovs_net *ovs_net;
1489         int err, i;
1490
1491         err = -EINVAL;
1492         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1493                 goto err;
1494
1495         reply = ovs_dp_cmd_alloc_info(info);
1496         if (!reply)
1497                 return -ENOMEM;
1498
1499         err = -ENOMEM;
1500         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1501         if (dp == NULL)
1502                 goto err_free_reply;
1503
1504         ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1505
1506         /* Allocate table. */
1507         err = ovs_flow_tbl_init(&dp->table);
1508         if (err)
1509                 goto err_free_dp;
1510
1511         dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1512         if (!dp->stats_percpu) {
1513                 err = -ENOMEM;
1514                 goto err_destroy_table;
1515         }
1516
1517         dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1518                             GFP_KERNEL);
1519         if (!dp->ports) {
1520                 err = -ENOMEM;
1521                 goto err_destroy_percpu;
1522         }
1523
1524         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1525                 INIT_HLIST_HEAD(&dp->ports[i]);
1526
1527         /* Set up our datapath device. */
1528         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1529         parms.type = OVS_VPORT_TYPE_INTERNAL;
1530         parms.options = NULL;
1531         parms.dp = dp;
1532         parms.port_no = OVSP_LOCAL;
1533         parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1534
1535         ovs_dp_change(dp, a);
1536
1537         /* So far only local changes have been made, now need the lock. */
1538         ovs_lock();
1539
1540         vport = new_vport(&parms);
1541         if (IS_ERR(vport)) {
1542                 err = PTR_ERR(vport);
1543                 if (err == -EBUSY)
1544                         err = -EEXIST;
1545
1546                 if (err == -EEXIST) {
1547                         /* An outdated user space instance that does not understand
1548                          * the concept of user_features has attempted to create a new
1549                          * datapath and is likely to reuse it. Drop all user features.
1550                          */
1551                         if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1552                                 ovs_dp_reset_user_features(skb, info);
1553                 }
1554
1555                 goto err_destroy_ports_array;
1556         }
1557
1558         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1559                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1560         BUG_ON(err < 0);
1561
1562         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1563         list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1564
1565         ovs_unlock();
1566
1567         ovs_notify(&dp_datapath_genl_family, reply, info);
1568         return 0;
1569
1570 err_destroy_ports_array:
1571         ovs_unlock();
1572         kfree(dp->ports);
1573 err_destroy_percpu:
1574         free_percpu(dp->stats_percpu);
1575 err_destroy_table:
1576         ovs_flow_tbl_destroy(&dp->table);
1577 err_free_dp:
1578         release_net(ovs_dp_get_net(dp));
1579         kfree(dp);
1580 err_free_reply:
1581         kfree_skb(reply);
1582 err:
1583         return err;
1584 }
1585
1586 /* Called with ovs_mutex. */
1587 static void __dp_destroy(struct datapath *dp)
1588 {
1589         int i;
1590
1591         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1592                 struct vport *vport;
1593                 struct hlist_node *n;
1594
1595                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1596                         if (vport->port_no != OVSP_LOCAL)
1597                                 ovs_dp_detach_port(vport);
1598         }
1599
1600         list_del_rcu(&dp->list_node);
1601
1602         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1603          * all ports in datapath are destroyed first before freeing datapath.
1604          */
1605         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1606
1607         /* RCU destroy the flow table */
1608         call_rcu(&dp->rcu, destroy_dp_rcu);
1609 }
1610
1611 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1612 {
1613         struct sk_buff *reply;
1614         struct datapath *dp;
1615         int err;
1616
1617         reply = ovs_dp_cmd_alloc_info(info);
1618         if (!reply)
1619                 return -ENOMEM;
1620
1621         ovs_lock();
1622         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1623         err = PTR_ERR(dp);
1624         if (IS_ERR(dp))
1625                 goto err_unlock_free;
1626
1627         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1628                                    info->snd_seq, 0, OVS_DP_CMD_DEL);
1629         BUG_ON(err < 0);
1630
1631         __dp_destroy(dp);
1632         ovs_unlock();
1633
1634         ovs_notify(&dp_datapath_genl_family, reply, info);
1635
1636         return 0;
1637
1638 err_unlock_free:
1639         ovs_unlock();
1640         kfree_skb(reply);
1641         return err;
1642 }
1643
1644 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1645 {
1646         struct sk_buff *reply;
1647         struct datapath *dp;
1648         int err;
1649
1650         reply = ovs_dp_cmd_alloc_info(info);
1651         if (!reply)
1652                 return -ENOMEM;
1653
1654         ovs_lock();
1655         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1656         err = PTR_ERR(dp);
1657         if (IS_ERR(dp))
1658                 goto err_unlock_free;
1659
1660         ovs_dp_change(dp, info->attrs);
1661
1662         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1663                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1664         BUG_ON(err < 0);
1665
1666         ovs_unlock();
1667         ovs_notify(&dp_datapath_genl_family, reply, info);
1668
1669         return 0;
1670
1671 err_unlock_free:
1672         ovs_unlock();
1673         kfree_skb(reply);
1674         return err;
1675 }
1676
1677 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1678 {
1679         struct sk_buff *reply;
1680         struct datapath *dp;
1681         int err;
1682
1683         reply = ovs_dp_cmd_alloc_info(info);
1684         if (!reply)
1685                 return -ENOMEM;
1686
1687         ovs_lock();
1688         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1689         if (IS_ERR(dp)) {
1690                 err = PTR_ERR(dp);
1691                 goto err_unlock_free;
1692         }
1693         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1694                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1695         BUG_ON(err < 0);
1696         ovs_unlock();
1697
1698         return genlmsg_reply(reply, info);
1699
1700 err_unlock_free:
1701         ovs_unlock();
1702         kfree_skb(reply);
1703         return err;
1704 }
1705
1706 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1707 {
1708         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1709         struct datapath *dp;
1710         int skip = cb->args[0];
1711         int i = 0;
1712
1713         ovs_lock();
1714         list_for_each_entry(dp, &ovs_net->dps, list_node) {
1715                 if (i >= skip &&
1716                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1717                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1718                                          OVS_DP_CMD_NEW) < 0)
1719                         break;
1720                 i++;
1721         }
1722         ovs_unlock();
1723
1724         cb->args[0] = i;
1725
1726         return skb->len;
1727 }
1728
1729 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1730         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1731         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1732         [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1733 };
1734
1735 static const struct genl_ops dp_datapath_genl_ops[] = {
1736         { .cmd = OVS_DP_CMD_NEW,
1737           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1738           .policy = datapath_policy,
1739           .doit = ovs_dp_cmd_new
1740         },
1741         { .cmd = OVS_DP_CMD_DEL,
1742           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1743           .policy = datapath_policy,
1744           .doit = ovs_dp_cmd_del
1745         },
1746         { .cmd = OVS_DP_CMD_GET,
1747           .flags = 0,               /* OK for unprivileged users. */
1748           .policy = datapath_policy,
1749           .doit = ovs_dp_cmd_get,
1750           .dumpit = ovs_dp_cmd_dump
1751         },
1752         { .cmd = OVS_DP_CMD_SET,
1753           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1754           .policy = datapath_policy,
1755           .doit = ovs_dp_cmd_set,
1756         },
1757 };
1758
1759 static struct genl_family dp_datapath_genl_family = {
1760         .id = GENL_ID_GENERATE,
1761         .hdrsize = sizeof(struct ovs_header),
1762         .name = OVS_DATAPATH_FAMILY,
1763         .version = OVS_DATAPATH_VERSION,
1764         .maxattr = OVS_DP_ATTR_MAX,
1765         .netnsok = true,
1766         .parallel_ops = true,
1767         .ops = dp_datapath_genl_ops,
1768         .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1769         .mcgrps = &ovs_dp_datapath_multicast_group,
1770         .n_mcgrps = 1,
1771 };
1772
1773 /* Called with ovs_mutex or RCU read lock. */
1774 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1775                                    u32 portid, u32 seq, u32 flags, u8 cmd)
1776 {
1777         struct ovs_header *ovs_header;
1778         struct ovs_vport_stats vport_stats;
1779         int err;
1780
1781         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1782                                  flags, cmd);
1783         if (!ovs_header)
1784                 return -EMSGSIZE;
1785
1786         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1787
1788         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1789             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1790             nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1791                            vport->ops->get_name(vport)))
1792                 goto nla_put_failure;
1793
1794         ovs_vport_get_stats(vport, &vport_stats);
1795         if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1796                     &vport_stats))
1797                 goto nla_put_failure;
1798
1799         if (ovs_vport_get_upcall_portids(vport, skb))
1800                 goto nla_put_failure;
1801
1802         err = ovs_vport_get_options(vport, skb);
1803         if (err == -EMSGSIZE)
1804                 goto error;
1805
1806         genlmsg_end(skb, ovs_header);
1807         return 0;
1808
1809 nla_put_failure:
1810         err = -EMSGSIZE;
1811 error:
1812         genlmsg_cancel(skb, ovs_header);
1813         return err;
1814 }
1815
1816 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1817 {
1818         return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1819 }
1820
1821 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1822 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1823                                          u32 seq, u8 cmd)
1824 {
1825         struct sk_buff *skb;
1826         int retval;
1827
1828         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1829         if (!skb)
1830                 return ERR_PTR(-ENOMEM);
1831
1832         retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1833         BUG_ON(retval < 0);
1834
1835         return skb;
1836 }
1837
1838 /* Called with ovs_mutex or RCU read lock. */
1839 static struct vport *lookup_vport(struct net *net,
1840                                   const struct ovs_header *ovs_header,
1841                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1842 {
1843         struct datapath *dp;
1844         struct vport *vport;
1845
1846         if (a[OVS_VPORT_ATTR_NAME]) {
1847                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1848                 if (!vport)
1849                         return ERR_PTR(-ENODEV);
1850                 if (ovs_header->dp_ifindex &&
1851                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1852                         return ERR_PTR(-ENODEV);
1853                 return vport;
1854         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1855                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1856
1857                 if (port_no >= DP_MAX_PORTS)
1858                         return ERR_PTR(-EFBIG);
1859
1860                 dp = get_dp(net, ovs_header->dp_ifindex);
1861                 if (!dp)
1862                         return ERR_PTR(-ENODEV);
1863
1864                 vport = ovs_vport_ovsl_rcu(dp, port_no);
1865                 if (!vport)
1866                         return ERR_PTR(-ENODEV);
1867                 return vport;
1868         } else
1869                 return ERR_PTR(-EINVAL);
1870 }
1871
1872 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1873 {
1874         struct nlattr **a = info->attrs;
1875         struct ovs_header *ovs_header = info->userhdr;
1876         struct vport_parms parms;
1877         struct sk_buff *reply;
1878         struct vport *vport;
1879         struct datapath *dp;
1880         u32 port_no;
1881         int err;
1882
1883         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1884             !a[OVS_VPORT_ATTR_UPCALL_PID])
1885                 return -EINVAL;
1886
1887         port_no = a[OVS_VPORT_ATTR_PORT_NO]
1888                 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1889         if (port_no >= DP_MAX_PORTS)
1890                 return -EFBIG;
1891
1892         reply = ovs_vport_cmd_alloc_info();
1893         if (!reply)
1894                 return -ENOMEM;
1895
1896         ovs_lock();
1897 restart:
1898         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1899         err = -ENODEV;
1900         if (!dp)
1901                 goto exit_unlock_free;
1902
1903         if (port_no) {
1904                 vport = ovs_vport_ovsl(dp, port_no);
1905                 err = -EBUSY;
1906                 if (vport)
1907                         goto exit_unlock_free;
1908         } else {
1909                 for (port_no = 1; ; port_no++) {
1910                         if (port_no >= DP_MAX_PORTS) {
1911                                 err = -EFBIG;
1912                                 goto exit_unlock_free;
1913                         }
1914                         vport = ovs_vport_ovsl(dp, port_no);
1915                         if (!vport)
1916                                 break;
1917                 }
1918         }
1919
1920         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1921         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1922         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1923         parms.dp = dp;
1924         parms.port_no = port_no;
1925         parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1926
1927         vport = new_vport(&parms);
1928         err = PTR_ERR(vport);
1929         if (IS_ERR(vport)) {
1930                 if (err == -EAGAIN)
1931                         goto restart;
1932                 goto exit_unlock_free;
1933         }
1934
1935         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1936                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1937         BUG_ON(err < 0);
1938         ovs_unlock();
1939
1940         ovs_notify(&dp_vport_genl_family, reply, info);
1941         return 0;
1942
1943 exit_unlock_free:
1944         ovs_unlock();
1945         kfree_skb(reply);
1946         return err;
1947 }
1948
1949 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1950 {
1951         struct nlattr **a = info->attrs;
1952         struct sk_buff *reply;
1953         struct vport *vport;
1954         int err;
1955
1956         reply = ovs_vport_cmd_alloc_info();
1957         if (!reply)
1958                 return -ENOMEM;
1959
1960         ovs_lock();
1961         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1962         err = PTR_ERR(vport);
1963         if (IS_ERR(vport))
1964                 goto exit_unlock_free;
1965
1966         if (a[OVS_VPORT_ATTR_TYPE] &&
1967             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1968                 err = -EINVAL;
1969                 goto exit_unlock_free;
1970         }
1971
1972         if (a[OVS_VPORT_ATTR_OPTIONS]) {
1973                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1974                 if (err)
1975                         goto exit_unlock_free;
1976         }
1977
1978
1979         if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
1980                 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
1981
1982                 err = ovs_vport_set_upcall_portids(vport, ids);
1983                 if (err)
1984                         goto exit_unlock_free;
1985         }
1986
1987         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1988                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1989         BUG_ON(err < 0);
1990
1991         ovs_unlock();
1992         ovs_notify(&dp_vport_genl_family, reply, info);
1993         return 0;
1994
1995 exit_unlock_free:
1996         ovs_unlock();
1997         kfree_skb(reply);
1998         return err;
1999 }
2000
2001 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2002 {
2003         struct nlattr **a = info->attrs;
2004         struct sk_buff *reply;
2005         struct vport *vport;
2006         int err;
2007
2008         reply = ovs_vport_cmd_alloc_info();
2009         if (!reply)
2010                 return -ENOMEM;
2011
2012         ovs_lock();
2013         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2014         err = PTR_ERR(vport);
2015         if (IS_ERR(vport))
2016                 goto exit_unlock_free;
2017
2018         if (vport->port_no == OVSP_LOCAL) {
2019                 err = -EINVAL;
2020                 goto exit_unlock_free;
2021         }
2022
2023         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2024                                       info->snd_seq, 0, OVS_VPORT_CMD_DEL);
2025         BUG_ON(err < 0);
2026         ovs_dp_detach_port(vport);
2027         ovs_unlock();
2028
2029         ovs_notify(&dp_vport_genl_family, reply, info);
2030         return 0;
2031
2032 exit_unlock_free:
2033         ovs_unlock();
2034         kfree_skb(reply);
2035         return err;
2036 }
2037
2038 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2039 {
2040         struct nlattr **a = info->attrs;
2041         struct ovs_header *ovs_header = info->userhdr;
2042         struct sk_buff *reply;
2043         struct vport *vport;
2044         int err;
2045
2046         reply = ovs_vport_cmd_alloc_info();
2047         if (!reply)
2048                 return -ENOMEM;
2049
2050         rcu_read_lock();
2051         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2052         err = PTR_ERR(vport);
2053         if (IS_ERR(vport))
2054                 goto exit_unlock_free;
2055         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2056                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2057         BUG_ON(err < 0);
2058         rcu_read_unlock();
2059
2060         return genlmsg_reply(reply, info);
2061
2062 exit_unlock_free:
2063         rcu_read_unlock();
2064         kfree_skb(reply);
2065         return err;
2066 }
2067
2068 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2069 {
2070         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2071         struct datapath *dp;
2072         int bucket = cb->args[0], skip = cb->args[1];
2073         int i, j = 0;
2074
2075         rcu_read_lock();
2076         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2077         if (!dp) {
2078                 rcu_read_unlock();
2079                 return -ENODEV;
2080         }
2081         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2082                 struct vport *vport;
2083
2084                 j = 0;
2085                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2086                         if (j >= skip &&
2087                             ovs_vport_cmd_fill_info(vport, skb,
2088                                                     NETLINK_CB(cb->skb).portid,
2089                                                     cb->nlh->nlmsg_seq,
2090                                                     NLM_F_MULTI,
2091                                                     OVS_VPORT_CMD_NEW) < 0)
2092                                 goto out;
2093
2094                         j++;
2095                 }
2096                 skip = 0;
2097         }
2098 out:
2099         rcu_read_unlock();
2100
2101         cb->args[0] = i;
2102         cb->args[1] = j;
2103
2104         return skb->len;
2105 }
2106
2107 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2108         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2109         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2110         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2111         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2112         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2113         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2114 };
2115
2116 static const struct genl_ops dp_vport_genl_ops[] = {
2117         { .cmd = OVS_VPORT_CMD_NEW,
2118           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2119           .policy = vport_policy,
2120           .doit = ovs_vport_cmd_new
2121         },
2122         { .cmd = OVS_VPORT_CMD_DEL,
2123           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2124           .policy = vport_policy,
2125           .doit = ovs_vport_cmd_del
2126         },
2127         { .cmd = OVS_VPORT_CMD_GET,
2128           .flags = 0,               /* OK for unprivileged users. */
2129           .policy = vport_policy,
2130           .doit = ovs_vport_cmd_get,
2131           .dumpit = ovs_vport_cmd_dump
2132         },
2133         { .cmd = OVS_VPORT_CMD_SET,
2134           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2135           .policy = vport_policy,
2136           .doit = ovs_vport_cmd_set,
2137         },
2138 };
2139
2140 struct genl_family dp_vport_genl_family = {
2141         .id = GENL_ID_GENERATE,
2142         .hdrsize = sizeof(struct ovs_header),
2143         .name = OVS_VPORT_FAMILY,
2144         .version = OVS_VPORT_VERSION,
2145         .maxattr = OVS_VPORT_ATTR_MAX,
2146         .netnsok = true,
2147         .parallel_ops = true,
2148         .ops = dp_vport_genl_ops,
2149         .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2150         .mcgrps = &ovs_dp_vport_multicast_group,
2151         .n_mcgrps = 1,
2152 };
2153
2154 static struct genl_family * const dp_genl_families[] = {
2155         &dp_datapath_genl_family,
2156         &dp_vport_genl_family,
2157         &dp_flow_genl_family,
2158         &dp_packet_genl_family,
2159 };
2160
2161 static void dp_unregister_genl(int n_families)
2162 {
2163         int i;
2164
2165         for (i = 0; i < n_families; i++)
2166                 genl_unregister_family(dp_genl_families[i]);
2167 }
2168
2169 static int dp_register_genl(void)
2170 {
2171         int err;
2172         int i;
2173
2174         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2175
2176                 err = genl_register_family(dp_genl_families[i]);
2177                 if (err)
2178                         goto error;
2179         }
2180
2181         return 0;
2182
2183 error:
2184         dp_unregister_genl(i);
2185         return err;
2186 }
2187
2188 static int __net_init ovs_init_net(struct net *net)
2189 {
2190         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2191
2192         INIT_LIST_HEAD(&ovs_net->dps);
2193         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2194         return 0;
2195 }
2196
2197 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2198                                             struct list_head *head)
2199 {
2200         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2201         struct datapath *dp;
2202
2203         list_for_each_entry(dp, &ovs_net->dps, list_node) {
2204                 int i;
2205
2206                 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2207                         struct vport *vport;
2208
2209                         hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2210                                 struct netdev_vport *netdev_vport;
2211
2212                                 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2213                                         continue;
2214
2215                                 netdev_vport = netdev_vport_priv(vport);
2216                                 if (dev_net(netdev_vport->dev) == dnet)
2217                                         list_add(&vport->detach_list, head);
2218                         }
2219                 }
2220         }
2221 }
2222
2223 static void __net_exit ovs_exit_net(struct net *dnet)
2224 {
2225         struct datapath *dp, *dp_next;
2226         struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2227         struct vport *vport, *vport_next;
2228         struct net *net;
2229         LIST_HEAD(head);
2230
2231         ovs_lock();
2232         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2233                 __dp_destroy(dp);
2234
2235         rtnl_lock();
2236         for_each_net(net)
2237                 list_vports_from_net(net, dnet, &head);
2238         rtnl_unlock();
2239
2240         /* Detach all vports from given namespace. */
2241         list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2242                 list_del(&vport->detach_list);
2243                 ovs_dp_detach_port(vport);
2244         }
2245
2246         ovs_unlock();
2247
2248         cancel_work_sync(&ovs_net->dp_notify_work);
2249 }
2250
2251 static struct pernet_operations ovs_net_ops = {
2252         .init = ovs_init_net,
2253         .exit = ovs_exit_net,
2254         .id   = &ovs_net_id,
2255         .size = sizeof(struct ovs_net),
2256 };
2257
2258 static int __init dp_init(void)
2259 {
2260         int err;
2261
2262         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2263
2264         pr_info("Open vSwitch switching datapath\n");
2265
2266         err = action_fifos_init();
2267         if (err)
2268                 goto error;
2269
2270         err = ovs_internal_dev_rtnl_link_register();
2271         if (err)
2272                 goto error_action_fifos_exit;
2273
2274         err = ovs_flow_init();
2275         if (err)
2276                 goto error_unreg_rtnl_link;
2277
2278         err = ovs_vport_init();
2279         if (err)
2280                 goto error_flow_exit;
2281
2282         err = register_pernet_device(&ovs_net_ops);
2283         if (err)
2284                 goto error_vport_exit;
2285
2286         err = register_netdevice_notifier(&ovs_dp_device_notifier);
2287         if (err)
2288                 goto error_netns_exit;
2289
2290         err = ovs_netdev_init();
2291         if (err)
2292                 goto error_unreg_notifier;
2293
2294         err = dp_register_genl();
2295         if (err < 0)
2296                 goto error_unreg_netdev;
2297
2298         return 0;
2299
2300 error_unreg_netdev:
2301         ovs_netdev_exit();
2302 error_unreg_notifier:
2303         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2304 error_netns_exit:
2305         unregister_pernet_device(&ovs_net_ops);
2306 error_vport_exit:
2307         ovs_vport_exit();
2308 error_flow_exit:
2309         ovs_flow_exit();
2310 error_unreg_rtnl_link:
2311         ovs_internal_dev_rtnl_link_unregister();
2312 error_action_fifos_exit:
2313         action_fifos_exit();
2314 error:
2315         return err;
2316 }
2317
2318 static void dp_cleanup(void)
2319 {
2320         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2321         ovs_netdev_exit();
2322         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2323         unregister_pernet_device(&ovs_net_ops);
2324         rcu_barrier();
2325         ovs_vport_exit();
2326         ovs_flow_exit();
2327         ovs_internal_dev_rtnl_link_unregister();
2328         action_fifos_exit();
2329 }
2330
2331 module_init(dp_init);
2332 module_exit(dp_cleanup);
2333
2334 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2335 MODULE_LICENSE("GPL");