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 <linux/genetlink.h>
  51 #include <net/genetlink.h>
  52 #include <net/genetlink.h>
  53 #include <net/net_namespace.h>
  54 #include <net/netns/generic.h>
  55
  56 #include "datapath.h"
  57 #include "flow.h"
  58 #include "flow_table.h"
  59 #include "flow_netlink.h"
  60 #include "vport-internal_dev.h"
  61 #include "vport-netdev.h"
  62
  63 int ovs_net_id __read_mostly;
  64
  65 static struct genl_family dp_packet_genl_family;
  66 static struct genl_family dp_flow_genl_family;
  67 static struct genl_family dp_datapath_genl_family;
  68
  69 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
  70         .name = OVS_FLOW_MCGROUP,
  71 };
  72
  73 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
  74         .name = OVS_DATAPATH_MCGROUP,
  75 };
  76
  77 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
  78         .name = OVS_VPORT_MCGROUP,
  79 };
  80
  81 /* Check if need to build a reply message.
  82  * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
  83 static bool ovs_must_notify(struct genl_info *info,
  84                             const struct genl_multicast_group *grp)
  85 {
  86         return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
  87                 netlink_has_listeners(genl_info_net(info)->genl_sock, 0);
  88 }
  89
  90 static void ovs_notify(struct genl_family *family,
  91                        struct sk_buff *skb, struct genl_info *info)
  92 {
  93         genl_notify(family, skb, genl_info_net(info), info->snd_portid,
  94                     0, info->nlhdr, GFP_KERNEL);
  95 }
  96
  97 /**
  98  * DOC: Locking:
  99  *
 100  * All writes e.g. Writes to device state (add/remove datapath, port, set
 101  * operations on vports, etc.), Writes to other state (flow table
 102  * modifications, set miscellaneous datapath parameters, etc.) are protected
 103  * by ovs_lock.
 104  *
 105  * Reads are protected by RCU.
 106  *
 107  * There are a few special cases (mostly stats) that have their own
 108  * synchronization but they nest under all of above and don't interact with
 109  * each other.
 110  *
 111  * The RTNL lock nests inside ovs_mutex.
 112  */
 113
 114 static DEFINE_MUTEX(ovs_mutex);
 115
 116 void ovs_lock(void)
 117 {
 118         mutex_lock(&ovs_mutex);
 119 }
 120
 121 void ovs_unlock(void)
 122 {
 123         mutex_unlock(&ovs_mutex);
 124 }
 125
 126 #ifdef CONFIG_LOCKDEP
 127 int lockdep_ovsl_is_held(void)
 128 {
 129         if (debug_locks)
 130                 return lockdep_is_held(&ovs_mutex);
 131         else
 132                 return 1;
 133 }
 134 #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 dp_upcall_info *);
 139 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
 140                                   const struct dp_upcall_info *);
 141
 142 /* Must be called with rcu_read_lock or ovs_mutex. */
 143 static struct datapath *get_dp(struct net *net, int dp_ifindex)
 144 {
 145         struct datapath *dp = NULL;
 146         struct net_device *dev;
 147
 148         rcu_read_lock();
 149         dev = dev_get_by_index_rcu(net, dp_ifindex);
 150         if (dev) {
 151                 struct vport *vport = ovs_internal_dev_get_vport(dev);
 152                 if (vport)
 153                         dp = vport->dp;
 154         }
 155         rcu_read_unlock();
 156
 157         return dp;
 158 }
 159
 160 /* Must be called with rcu_read_lock or ovs_mutex. */
 161 static const char *ovs_dp_name(const struct datapath *dp)
 162 {
 163         struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
 164         return vport->ops->get_name(vport);
 165 }
 166
 167 static int get_dpifindex(struct datapath *dp)
 168 {
 169         struct vport *local;
 170         int ifindex;
 171
 172         rcu_read_lock();
 173
 174         local = ovs_vport_rcu(dp, OVSP_LOCAL);
 175         if (local)
 176                 ifindex = netdev_vport_priv(local)->dev->ifindex;
 177         else
 178                 ifindex = 0;
 179
 180         rcu_read_unlock();
 181
 182         return ifindex;
 183 }
 184
 185 static void destroy_dp_rcu(struct rcu_head *rcu)
 186 {
 187         struct datapath *dp = container_of(rcu, struct datapath, rcu);
 188
 189         free_percpu(dp->stats_percpu);
 190         release_net(ovs_dp_get_net(dp));
 191         kfree(dp->ports);
 192         kfree(dp);
 193 }
 194
 195 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
 196                                             u16 port_no)
 197 {
 198         return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
 199 }
 200
 201 /* Called with ovs_mutex or RCU read lock. */
 202 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
 203 {
 204         struct vport *vport;
 205         struct hlist_head *head;
 206
 207         head = vport_hash_bucket(dp, port_no);
 208         hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
 209                 if (vport->port_no == port_no)
 210                         return vport;
 211         }
 212         return NULL;
 213 }
 214
 215 /* Called with ovs_mutex. */
 216 static struct vport *new_vport(const struct vport_parms *parms)
 217 {
 218         struct vport *vport;
 219
 220         vport = ovs_vport_add(parms);
 221         if (!IS_ERR(vport)) {
 222                 struct datapath *dp = parms->dp;
 223                 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
 224
 225                 hlist_add_head_rcu(&vport->dp_hash_node, head);
 226         }
 227         return vport;
 228 }
 229
 230 void ovs_dp_detach_port(struct vport *p)
 231 {
 232         ASSERT_OVSL();
 233
 234         /* First drop references to device. */
 235         hlist_del_rcu(&p->dp_hash_node);
 236
 237         /* Then destroy it. */
 238         ovs_vport_del(p);
 239 }
 240
 241 /* Must be called with rcu_read_lock. */
 242 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
 243 {
 244         struct datapath *dp = p->dp;
 245         struct sw_flow *flow;
 246         struct dp_stats_percpu *stats;
 247         struct sw_flow_key key;
 248         u64 *stats_counter;
 249         u32 n_mask_hit;
 250         int error;
 251
 252         stats = this_cpu_ptr(dp->stats_percpu);
 253
 254         /* Extract flow from 'skb' into 'key'. */
 255         error = ovs_flow_extract(skb, p->port_no, &key);
 256         if (unlikely(error)) {
 257                 kfree_skb(skb);
 258                 return;
 259         }
 260
 261         /* Look up flow. */
 262         flow = ovs_flow_tbl_lookup_stats(&dp->table, &key, &n_mask_hit);
 263         if (unlikely(!flow)) {
 264                 struct dp_upcall_info upcall;
 265
 266                 upcall.cmd = OVS_PACKET_CMD_MISS;
 267                 upcall.key = &key;
 268                 upcall.userdata = NULL;
 269                 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
 270                 ovs_dp_upcall(dp, skb, &upcall);
 271                 consume_skb(skb);
 272                 stats_counter = &stats->n_missed;
 273                 goto out;
 274         }
 275
 276         OVS_CB(skb)->flow = flow;
 277         OVS_CB(skb)->pkt_key = &key;
 278
 279         ovs_flow_stats_update(OVS_CB(skb)->flow, key.tp.flags, skb);
 280         ovs_execute_actions(dp, skb);
 281         stats_counter = &stats->n_hit;
 282
 283 out:
 284         /* Update datapath statistics. */
 285         u64_stats_update_begin(&stats->syncp);
 286         (*stats_counter)++;
 287         stats->n_mask_hit += n_mask_hit;
 288         u64_stats_update_end(&stats->syncp);
 289 }
 290
 291 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
 292                   const struct dp_upcall_info *upcall_info)
 293 {
 294         struct dp_stats_percpu *stats;
 295         int err;
 296
 297         if (upcall_info->portid == 0) {
 298                 err = -ENOTCONN;
 299                 goto err;
 300         }
 301
 302         if (!skb_is_gso(skb))
 303                 err = queue_userspace_packet(dp, skb, upcall_info);
 304         else
 305                 err = queue_gso_packets(dp, skb, upcall_info);
 306         if (err)
 307                 goto err;
 308
 309         return 0;
 310
 311 err:
 312         stats = this_cpu_ptr(dp->stats_percpu);
 313
 314         u64_stats_update_begin(&stats->syncp);
 315         stats->n_lost++;
 316         u64_stats_update_end(&stats->syncp);
 317
 318         return err;
 319 }
 320
 321 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
 322                              const struct dp_upcall_info *upcall_info)
 323 {
 324         unsigned short gso_type = skb_shinfo(skb)->gso_type;
 325         struct dp_upcall_info later_info;
 326         struct sw_flow_key later_key;
 327         struct sk_buff *segs, *nskb;
 328         int err;
 329
 330         segs = __skb_gso_segment(skb, NETIF_F_SG, false);
 331         if (IS_ERR(segs))
 332                 return PTR_ERR(segs);
 333
 334         /* Queue all of the segments. */
 335         skb = segs;
 336         do {
 337                 err = queue_userspace_packet(dp, skb, upcall_info);
 338                 if (err)
 339                         break;
 340
 341                 if (skb == segs && gso_type & SKB_GSO_UDP) {
 342                         /* The initial flow key extracted by ovs_flow_extract()
 343                          * in this case is for a first fragment, so we need to
 344                          * properly mark later fragments.
 345                          */
 346                         later_key = *upcall_info->key;
 347                         later_key.ip.frag = OVS_FRAG_TYPE_LATER;
 348
 349                         later_info = *upcall_info;
 350                         later_info.key = &later_key;
 351                         upcall_info = &later_info;
 352                 }
 353         } while ((skb = skb->next));
 354
 355         /* Free all of the segments. */
 356         skb = segs;
 357         do {
 358                 nskb = skb->next;
 359                 if (err)
 360                         kfree_skb(skb);
 361                 else
 362                         consume_skb(skb);
 363         } while ((skb = nskb));
 364         return err;
 365 }
 366
 367 static size_t key_attr_size(void)
 368 {
 369         return    nla_total_size(4)   /* OVS_KEY_ATTR_PRIORITY */
 370                 + nla_total_size(0)   /* OVS_KEY_ATTR_TUNNEL */
 371                   + nla_total_size(8)   /* OVS_TUNNEL_KEY_ATTR_ID */
 372                   + nla_total_size(4)   /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
 373                   + nla_total_size(4)   /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
 374                   + nla_total_size(1)   /* OVS_TUNNEL_KEY_ATTR_TOS */
 375                   + nla_total_size(1)   /* OVS_TUNNEL_KEY_ATTR_TTL */
 376                   + nla_total_size(0)   /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
 377                   + nla_total_size(0)   /* OVS_TUNNEL_KEY_ATTR_CSUM */
 378                 + nla_total_size(4)   /* OVS_KEY_ATTR_IN_PORT */
 379                 + nla_total_size(4)   /* OVS_KEY_ATTR_SKB_MARK */
 380                 + nla_total_size(12)  /* OVS_KEY_ATTR_ETHERNET */
 381                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 382                 + nla_total_size(4)   /* OVS_KEY_ATTR_8021Q */
 383                 + nla_total_size(0)   /* OVS_KEY_ATTR_ENCAP */
 384                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 385                 + nla_total_size(40)  /* OVS_KEY_ATTR_IPV6 */
 386                 + nla_total_size(2)   /* OVS_KEY_ATTR_ICMPV6 */
 387                 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
 388 }
 389
 390 static size_t upcall_msg_size(const struct nlattr *userdata,
 391                               unsigned int hdrlen)
 392 {
 393         size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
 394                 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
 395                 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
 396
 397         /* OVS_PACKET_ATTR_USERDATA */
 398         if (userdata)
 399                 size += NLA_ALIGN(userdata->nla_len);
 400
 401         return size;
 402 }
 403
 404 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
 405                                   const struct dp_upcall_info *upcall_info)
 406 {
 407         struct ovs_header *upcall;
 408         struct sk_buff *nskb = NULL;
 409         struct sk_buff *user_skb; /* to be queued to userspace */
 410         struct nlattr *nla;
 411         struct genl_info info = {
 412                 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
 413                 .snd_portid = upcall_info->portid,
 414         };
 415         size_t len;
 416         unsigned int hlen;
 417         int err, dp_ifindex;
 418
 419         dp_ifindex = get_dpifindex(dp);
 420         if (!dp_ifindex)
 421                 return -ENODEV;
 422
 423         if (vlan_tx_tag_present(skb)) {
 424                 nskb = skb_clone(skb, GFP_ATOMIC);
 425                 if (!nskb)
 426                         return -ENOMEM;
 427
 428                 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb));
 429                 if (!nskb)
 430                         return -ENOMEM;
 431
 432                 nskb->vlan_tci = 0;
 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->userdata, 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         nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
 467         err = ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb);
 468         BUG_ON(err);
 469         nla_nest_end(user_skb, nla);
 470
 471         if (upcall_info->userdata)
 472                 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
 473                           nla_len(upcall_info->userdata),
 474                           nla_data(upcall_info->userdata));
 475
 476         /* Only reserve room for attribute header, packet data is added
 477          * in skb_zerocopy() */
 478         if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
 479                 err = -ENOBUFS;
 480                 goto out;
 481         }
 482         nla->nla_len = nla_attr_size(skb->len);
 483
 484         err = skb_zerocopy(user_skb, skb, skb->len, hlen);
 485         if (err)
 486                 goto out;
 487
 488         /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
 489         if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
 490                 size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len;
 491
 492                 if (plen > 0)
 493                         memset(skb_put(user_skb, plen), 0, plen);
 494         }
 495
 496         ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
 497
 498         err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
 499 out:
 500         if (err)
 501                 skb_tx_error(skb);
 502         kfree_skb(nskb);
 503         return err;
 504 }
 505
 506 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 507 {
 508         struct ovs_header *ovs_header = info->userhdr;
 509         struct nlattr **a = info->attrs;
 510         struct sw_flow_actions *acts;
 511         struct sk_buff *packet;
 512         struct sw_flow *flow;
 513         struct datapath *dp;
 514         struct ethhdr *eth;
 515         int len;
 516         int err;
 517
 518         err = -EINVAL;
 519         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 520             !a[OVS_PACKET_ATTR_ACTIONS])
 521                 goto err;
 522
 523         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 524         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 525         err = -ENOMEM;
 526         if (!packet)
 527                 goto err;
 528         skb_reserve(packet, NET_IP_ALIGN);
 529
 530         nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
 531
 532         skb_reset_mac_header(packet);
 533         eth = eth_hdr(packet);
 534
 535         /* Normally, setting the skb 'protocol' field would be handled by a
 536          * call to eth_type_trans(), but it assumes there's a sending
 537          * device, which we may not have. */
 538         if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
 539                 packet->protocol = eth->h_proto;
 540         else
 541                 packet->protocol = htons(ETH_P_802_2);
 542
 543         /* Build an sw_flow for sending this packet. */
 544         flow = ovs_flow_alloc();
 545         err = PTR_ERR(flow);
 546         if (IS_ERR(flow))
 547                 goto err_kfree_skb;
 548
 549         err = ovs_flow_extract(packet, -1, &flow->key);
 550         if (err)
 551                 goto err_flow_free;
 552
 553         err = ovs_nla_get_flow_metadata(flow, a[OVS_PACKET_ATTR_KEY]);
 554         if (err)
 555                 goto err_flow_free;
 556         acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
 557         err = PTR_ERR(acts);
 558         if (IS_ERR(acts))
 559                 goto err_flow_free;
 560
 561         err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
 562                                    &flow->key, 0, &acts);
 563         rcu_assign_pointer(flow->sf_acts, acts);
 564         if (err)
 565                 goto err_flow_free;
 566
 567         OVS_CB(packet)->flow = flow;
 568         OVS_CB(packet)->pkt_key = &flow->key;
 569         packet->priority = flow->key.phy.priority;
 570         packet->mark = flow->key.phy.skb_mark;
 571
 572         rcu_read_lock();
 573         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 574         err = -ENODEV;
 575         if (!dp)
 576                 goto err_unlock;
 577
 578         local_bh_disable();
 579         err = ovs_execute_actions(dp, packet);
 580         local_bh_enable();
 581         rcu_read_unlock();
 582
 583         ovs_flow_free(flow, false);
 584         return err;
 585
 586 err_unlock:
 587         rcu_read_unlock();
 588 err_flow_free:
 589         ovs_flow_free(flow, false);
 590 err_kfree_skb:
 591         kfree_skb(packet);
 592 err:
 593         return err;
 594 }
 595
 596 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 597         [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
 598         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 599         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 600 };
 601
 602 static const struct genl_ops dp_packet_genl_ops[] = {
 603         { .cmd = OVS_PACKET_CMD_EXECUTE,
 604           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 605           .policy = packet_policy,
 606           .doit = ovs_packet_cmd_execute
 607         }
 608 };
 609
 610 static struct genl_family dp_packet_genl_family = {
 611         .id = GENL_ID_GENERATE,
 612         .hdrsize = sizeof(struct ovs_header),
 613         .name = OVS_PACKET_FAMILY,
 614         .version = OVS_PACKET_VERSION,
 615         .maxattr = OVS_PACKET_ATTR_MAX,
 616         .netnsok = true,
 617         .parallel_ops = true,
 618         .ops = dp_packet_genl_ops,
 619         .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
 620 };
 621
 622 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats,
 623                          struct ovs_dp_megaflow_stats *mega_stats)
 624 {
 625         int i;
 626
 627         memset(mega_stats, 0, sizeof(*mega_stats));
 628
 629         stats->n_flows = ovs_flow_tbl_count(&dp->table);
 630         mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
 631
 632         stats->n_hit = stats->n_missed = stats->n_lost = 0;
 633
 634         for_each_possible_cpu(i) {
 635                 const struct dp_stats_percpu *percpu_stats;
 636                 struct dp_stats_percpu local_stats;
 637                 unsigned int start;
 638
 639                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 640
 641                 do {
 642                         start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
 643                         local_stats = *percpu_stats;
 644                 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
 645
 646                 stats->n_hit += local_stats.n_hit;
 647                 stats->n_missed += local_stats.n_missed;
 648                 stats->n_lost += local_stats.n_lost;
 649                 mega_stats->n_mask_hit += local_stats.n_mask_hit;
 650         }
 651 }
 652
 653 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
 654 {
 655         return NLMSG_ALIGN(sizeof(struct ovs_header))
 656                 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
 657                 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
 658                 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
 659                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
 660                 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
 661                 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
 662 }
 663
 664 /* Called with ovs_mutex or RCU read lock. */
 665 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
 666                                   struct sk_buff *skb, u32 portid,
 667                                   u32 seq, u32 flags, u8 cmd)
 668 {
 669         const int skb_orig_len = skb->len;
 670         struct nlattr *start;
 671         struct ovs_flow_stats stats;
 672         __be16 tcp_flags;
 673         unsigned long used;
 674         struct ovs_header *ovs_header;
 675         struct nlattr *nla;
 676         int err;
 677
 678         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
 679         if (!ovs_header)
 680                 return -EMSGSIZE;
 681
 682         ovs_header->dp_ifindex = dp_ifindex;
 683
 684         /* Fill flow key. */
 685         nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
 686         if (!nla)
 687                 goto nla_put_failure;
 688
 689         err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb);
 690         if (err)
 691                 goto error;
 692         nla_nest_end(skb, nla);
 693
 694         nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
 695         if (!nla)
 696                 goto nla_put_failure;
 697
 698         err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb);
 699         if (err)
 700                 goto error;
 701
 702         nla_nest_end(skb, nla);
 703
 704         ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
 705
 706         if (used &&
 707             nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
 708                 goto nla_put_failure;
 709
 710         if (stats.n_packets &&
 711             nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
 712                 goto nla_put_failure;
 713
 714         if ((u8)ntohs(tcp_flags) &&
 715              nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
 716                 goto nla_put_failure;
 717
 718         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 719          * this is the first flow to be dumped into 'skb'.  This is unusual for
 720          * Netlink but individual action lists can be longer than
 721          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 722          * The userspace caller can always fetch the actions separately if it
 723          * really wants them.  (Most userspace callers in fact don't care.)
 724          *
 725          * This can only fail for dump operations because the skb is always
 726          * properly sized for single flows.
 727          */
 728         start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
 729         if (start) {
 730                 const struct sw_flow_actions *sf_acts;
 731
 732                 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
 733                 err = ovs_nla_put_actions(sf_acts->actions,
 734                                           sf_acts->actions_len, skb);
 735
 736                 if (!err)
 737                         nla_nest_end(skb, start);
 738                 else {
 739                         if (skb_orig_len)
 740                                 goto error;
 741
 742                         nla_nest_cancel(skb, start);
 743                 }
 744         } else if (skb_orig_len)
 745                 goto nla_put_failure;
 746
 747         return genlmsg_end(skb, ovs_header);
 748
 749 nla_put_failure:
 750         err = -EMSGSIZE;
 751 error:
 752         genlmsg_cancel(skb, ovs_header);
 753         return err;
 754 }
 755
 756 /* May not be called with RCU read lock. */
 757 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
 758                                                struct genl_info *info,
 759                                                bool always)
 760 {
 761         struct sk_buff *skb;
 762
 763         if (!always && !ovs_must_notify(info, &ovs_dp_flow_multicast_group))
 764                 return NULL;
 765
 766         skb = genlmsg_new_unicast(ovs_flow_cmd_msg_size(acts), info, GFP_KERNEL);
 767         if (!skb)
 768                 return ERR_PTR(-ENOMEM);
 769
 770         return skb;
 771 }
 772
 773 /* Called with ovs_mutex. */
 774 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
 775                                                int dp_ifindex,
 776                                                struct genl_info *info, u8 cmd,
 777                                                bool always)
 778 {
 779         struct sk_buff *skb;
 780         int retval;
 781
 782         skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), info,
 783                                       always);
 784         if (IS_ERR_OR_NULL(skb))
 785                 return skb;
 786
 787         retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
 788                                         info->snd_portid, info->snd_seq, 0,
 789                                         cmd);
 790         BUG_ON(retval < 0);
 791         return skb;
 792 }
 793
 794 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
 795 {
 796         struct nlattr **a = info->attrs;
 797         struct ovs_header *ovs_header = info->userhdr;
 798         struct sw_flow *flow, *new_flow;
 799         struct sw_flow_mask mask;
 800         struct sk_buff *reply;
 801         struct datapath *dp;
 802         struct sw_flow_actions *acts;
 803         struct sw_flow_match match;
 804         int error;
 805
 806         /* Must have key and actions. */
 807         error = -EINVAL;
 808         if (!a[OVS_FLOW_ATTR_KEY])
 809                 goto error;
 810         if (!a[OVS_FLOW_ATTR_ACTIONS])
 811                 goto error;
 812
 813         /* Most of the time we need to allocate a new flow, do it before
 814          * locking.
 815          */
 816         new_flow = ovs_flow_alloc();
 817         if (IS_ERR(new_flow)) {
 818                 error = PTR_ERR(new_flow);
 819                 goto error;
 820         }
 821
 822         /* Extract key. */
 823         ovs_match_init(&match, &new_flow->unmasked_key, &mask);
 824         error = ovs_nla_get_match(&match,
 825                                   a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
 826         if (error)
 827                 goto err_kfree_flow;
 828
 829         ovs_flow_mask_key(&new_flow->key, &new_flow->unmasked_key, &mask);
 830
 831         /* Validate actions. */
 832         acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
 833         error = PTR_ERR(acts);
 834         if (IS_ERR(acts))
 835                 goto err_kfree_flow;
 836
 837         error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &new_flow->key,
 838                                      0, &acts);
 839         if (error) {
 840                 OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
 841                 goto err_kfree_acts;
 842         }
 843
 844         reply = ovs_flow_cmd_alloc_info(acts, info, false);
 845         if (IS_ERR(reply)) {
 846                 error = PTR_ERR(reply);
 847                 goto err_kfree_acts;
 848         }
 849
 850         ovs_lock();
 851         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 852         if (unlikely(!dp)) {
 853                 error = -ENODEV;
 854                 goto err_unlock_ovs;
 855         }
 856         /* Check if this is a duplicate flow */
 857         flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->unmasked_key);
 858         if (likely(!flow)) {
 859                 rcu_assign_pointer(new_flow->sf_acts, acts);
 860
 861                 /* Put flow in bucket. */
 862                 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
 863                 if (unlikely(error)) {
 864                         acts = NULL;
 865                         goto err_unlock_ovs;
 866                 }
 867
 868                 if (unlikely(reply)) {
 869                         error = ovs_flow_cmd_fill_info(new_flow,
 870                                                        ovs_header->dp_ifindex,
 871                                                        reply, info->snd_portid,
 872                                                        info->snd_seq, 0,
 873                                                        OVS_FLOW_CMD_NEW);
 874                         BUG_ON(error < 0);
 875                 }
 876                 ovs_unlock();
 877         } else {
 878                 struct sw_flow_actions *old_acts;
 879
 880                 /* Bail out if we're not allowed to modify an existing flow.
 881                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
 882                  * because Generic Netlink treats the latter as a dump
 883                  * request.  We also accept NLM_F_EXCL in case that bug ever
 884                  * gets fixed.
 885                  */
 886                 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
 887                                                          | NLM_F_EXCL))) {
 888                         error = -EEXIST;
 889                         goto err_unlock_ovs;
 890                 }
 891                 /* The unmasked key has to be the same for flow updates. */
 892                 if (unlikely(!ovs_flow_cmp_unmasked_key(flow, &match))) {
 893                         flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
 894                         if (!flow) {
 895                                 error = -ENOENT;
 896                                 goto err_unlock_ovs;
 897                         }
 898                 }
 899                 /* Update actions. */
 900                 old_acts = ovsl_dereference(flow->sf_acts);
 901                 rcu_assign_pointer(flow->sf_acts, acts);
 902
 903                 if (unlikely(reply)) {
 904                         error = ovs_flow_cmd_fill_info(flow,
 905                                                        ovs_header->dp_ifindex,
 906                                                        reply, info->snd_portid,
 907                                                        info->snd_seq, 0,
 908                                                        OVS_FLOW_CMD_NEW);
 909                         BUG_ON(error < 0);
 910                 }
 911                 ovs_unlock();
 912
 913                 ovs_nla_free_flow_actions(old_acts);
 914                 ovs_flow_free(new_flow, false);
 915         }
 916
 917         if (reply)
 918                 ovs_notify(&dp_flow_genl_family, reply, info);
 919         return 0;
 920
 921 err_unlock_ovs:
 922         ovs_unlock();
 923         kfree_skb(reply);
 924 err_kfree_acts:
 925         kfree(acts);
 926 err_kfree_flow:
 927         ovs_flow_free(new_flow, false);
 928 error:
 929         return error;
 930 }
 931
 932 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
 933 {
 934         struct nlattr **a = info->attrs;
 935         struct ovs_header *ovs_header = info->userhdr;
 936         struct sw_flow_key key, masked_key;
 937         struct sw_flow *flow;
 938         struct sw_flow_mask mask;
 939         struct sk_buff *reply = NULL;
 940         struct datapath *dp;
 941         struct sw_flow_actions *old_acts = NULL, *acts = NULL;
 942         struct sw_flow_match match;
 943         int error;
 944
 945         /* Extract key. */
 946         error = -EINVAL;
 947         if (!a[OVS_FLOW_ATTR_KEY])
 948                 goto error;
 949
 950         ovs_match_init(&match, &key, &mask);
 951         error = ovs_nla_get_match(&match,
 952                                   a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
 953         if (error)
 954                 goto error;
 955
 956         /* Validate actions. */
 957         if (a[OVS_FLOW_ATTR_ACTIONS]) {
 958                 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
 959                 error = PTR_ERR(acts);
 960                 if (IS_ERR(acts))
 961                         goto error;
 962
 963                 ovs_flow_mask_key(&masked_key, &key, &mask);
 964                 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS],
 965                                              &masked_key, 0, &acts);
 966                 if (error) {
 967                         OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
 968                         goto err_kfree_acts;
 969                 }
 970         }
 971
 972         /* Can allocate before locking if have acts. */
 973         if (acts) {
 974                 reply = ovs_flow_cmd_alloc_info(acts, info, false);
 975                 if (IS_ERR(reply)) {
 976                         error = PTR_ERR(reply);
 977                         goto err_kfree_acts;
 978                 }
 979         }
 980
 981         ovs_lock();
 982         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 983         if (unlikely(!dp)) {
 984                 error = -ENODEV;
 985                 goto err_unlock_ovs;
 986         }
 987         /* Check that the flow exists. */
 988         flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
 989         if (unlikely(!flow)) {
 990                 error = -ENOENT;
 991                 goto err_unlock_ovs;
 992         }
 993
 994         /* Update actions, if present. */
 995         if (likely(acts)) {
 996                 old_acts = ovsl_dereference(flow->sf_acts);
 997                 rcu_assign_pointer(flow->sf_acts, acts);
 998
 999                 if (unlikely(reply)) {
1000                         error = ovs_flow_cmd_fill_info(flow,
1001                                                        ovs_header->dp_ifindex,
1002                                                        reply, info->snd_portid,
1003                                                        info->snd_seq, 0,
1004                                                        OVS_FLOW_CMD_NEW);
1005                         BUG_ON(error < 0);
1006                 }
1007         } else {
1008                 /* Could not alloc without acts before locking. */
1009                 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1010                                                 info, OVS_FLOW_CMD_NEW, false);
1011                 if (unlikely(IS_ERR(reply))) {
1012                         error = PTR_ERR(reply);
1013                         goto err_unlock_ovs;
1014                 }
1015         }
1016
1017         /* Clear stats. */
1018         if (a[OVS_FLOW_ATTR_CLEAR])
1019                 ovs_flow_stats_clear(flow);
1020         ovs_unlock();
1021
1022         if (reply)
1023                 ovs_notify(&dp_flow_genl_family, reply, info);
1024         if (old_acts)
1025                 ovs_nla_free_flow_actions(old_acts);
1026
1027         return 0;
1028
1029 err_unlock_ovs:
1030         ovs_unlock();
1031         kfree_skb(reply);
1032 err_kfree_acts:
1033         kfree(acts);
1034 error:
1035         return error;
1036 }
1037
1038 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1039 {
1040         struct nlattr **a = info->attrs;
1041         struct ovs_header *ovs_header = info->userhdr;
1042         struct sw_flow_key key;
1043         struct sk_buff *reply;
1044         struct sw_flow *flow;
1045         struct datapath *dp;
1046         struct sw_flow_match match;
1047         int err;
1048
1049         if (!a[OVS_FLOW_ATTR_KEY]) {
1050                 OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
1051                 return -EINVAL;
1052         }
1053
1054         ovs_match_init(&match, &key, NULL);
1055         err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1056         if (err)
1057                 return err;
1058
1059         ovs_lock();
1060         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1061         if (!dp) {
1062                 err = -ENODEV;
1063                 goto unlock;
1064         }
1065
1066         flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1067         if (!flow) {
1068                 err = -ENOENT;
1069                 goto unlock;
1070         }
1071
1072         reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1073                                         OVS_FLOW_CMD_NEW, true);
1074         if (IS_ERR(reply)) {
1075                 err = PTR_ERR(reply);
1076                 goto unlock;
1077         }
1078
1079         ovs_unlock();
1080         return genlmsg_reply(reply, info);
1081 unlock:
1082         ovs_unlock();
1083         return err;
1084 }
1085
1086 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1087 {
1088         struct nlattr **a = info->attrs;
1089         struct ovs_header *ovs_header = info->userhdr;
1090         struct sw_flow_key key;
1091         struct sk_buff *reply;
1092         struct sw_flow *flow;
1093         struct datapath *dp;
1094         struct sw_flow_match match;
1095         int err;
1096
1097         if (likely(a[OVS_FLOW_ATTR_KEY])) {
1098                 ovs_match_init(&match, &key, NULL);
1099                 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1100                 if (unlikely(err))
1101                         return err;
1102         }
1103
1104         ovs_lock();
1105         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1106         if (unlikely(!dp)) {
1107                 err = -ENODEV;
1108                 goto unlock;
1109         }
1110
1111         if (unlikely(!a[OVS_FLOW_ATTR_KEY])) {
1112                 err = ovs_flow_tbl_flush(&dp->table);
1113                 goto unlock;
1114         }
1115
1116         flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1117         if (unlikely(!flow)) {
1118                 err = -ENOENT;
1119                 goto unlock;
1120         }
1121
1122         ovs_flow_tbl_remove(&dp->table, flow);
1123         ovs_unlock();
1124
1125         reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1126                                         info, false);
1127         if (likely(reply)) {
1128                 if (likely(!IS_ERR(reply))) {
1129                         rcu_read_lock();        /*To keep RCU checker happy. */
1130                         err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1131                                                      reply, info->snd_portid,
1132                                                      info->snd_seq, 0,
1133                                                      OVS_FLOW_CMD_DEL);
1134                         rcu_read_unlock();
1135                         BUG_ON(err < 0);
1136
1137                         ovs_notify(&dp_flow_genl_family, reply, info);
1138                 } else {
1139                         netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1140                 }
1141         }
1142
1143         ovs_flow_free(flow, true);
1144         return 0;
1145 unlock:
1146         ovs_unlock();
1147         return err;
1148 }
1149
1150 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1151 {
1152         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1153         struct table_instance *ti;
1154         struct datapath *dp;
1155
1156         rcu_read_lock();
1157         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1158         if (!dp) {
1159                 rcu_read_unlock();
1160                 return -ENODEV;
1161         }
1162
1163         ti = rcu_dereference(dp->table.ti);
1164         for (;;) {
1165                 struct sw_flow *flow;
1166                 u32 bucket, obj;
1167
1168                 bucket = cb->args[0];
1169                 obj = cb->args[1];
1170                 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1171                 if (!flow)
1172                         break;
1173
1174                 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1175                                            NETLINK_CB(cb->skb).portid,
1176                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1177                                            OVS_FLOW_CMD_NEW) < 0)
1178                         break;
1179
1180                 cb->args[0] = bucket;
1181                 cb->args[1] = obj;
1182         }
1183         rcu_read_unlock();
1184         return skb->len;
1185 }
1186
1187 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1188         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1189         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1190         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1191 };
1192
1193 static const struct genl_ops dp_flow_genl_ops[] = {
1194         { .cmd = OVS_FLOW_CMD_NEW,
1195           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1196           .policy = flow_policy,
1197           .doit = ovs_flow_cmd_new
1198         },
1199         { .cmd = OVS_FLOW_CMD_DEL,
1200           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1201           .policy = flow_policy,
1202           .doit = ovs_flow_cmd_del
1203         },
1204         { .cmd = OVS_FLOW_CMD_GET,
1205           .flags = 0,               /* OK for unprivileged users. */
1206           .policy = flow_policy,
1207           .doit = ovs_flow_cmd_get,
1208           .dumpit = ovs_flow_cmd_dump
1209         },
1210         { .cmd = OVS_FLOW_CMD_SET,
1211           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1212           .policy = flow_policy,
1213           .doit = ovs_flow_cmd_set,
1214         },
1215 };
1216
1217 static struct genl_family dp_flow_genl_family = {
1218         .id = GENL_ID_GENERATE,
1219         .hdrsize = sizeof(struct ovs_header),
1220         .name = OVS_FLOW_FAMILY,
1221         .version = OVS_FLOW_VERSION,
1222         .maxattr = OVS_FLOW_ATTR_MAX,
1223         .netnsok = true,
1224         .parallel_ops = true,
1225         .ops = dp_flow_genl_ops,
1226         .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1227         .mcgrps = &ovs_dp_flow_multicast_group,
1228         .n_mcgrps = 1,
1229 };
1230
1231 static size_t ovs_dp_cmd_msg_size(void)
1232 {
1233         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1234
1235         msgsize += nla_total_size(IFNAMSIZ);
1236         msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1237         msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1238         msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1239
1240         return msgsize;
1241 }
1242
1243 /* Called with ovs_mutex or RCU read lock. */
1244 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1245                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1246 {
1247         struct ovs_header *ovs_header;
1248         struct ovs_dp_stats dp_stats;
1249         struct ovs_dp_megaflow_stats dp_megaflow_stats;
1250         int err;
1251
1252         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1253                                    flags, cmd);
1254         if (!ovs_header)
1255                 goto error;
1256
1257         ovs_header->dp_ifindex = get_dpifindex(dp);
1258
1259         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1260         if (err)
1261                 goto nla_put_failure;
1262
1263         get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1264         if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1265                         &dp_stats))
1266                 goto nla_put_failure;
1267
1268         if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1269                         sizeof(struct ovs_dp_megaflow_stats),
1270                         &dp_megaflow_stats))
1271                 goto nla_put_failure;
1272
1273         if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1274                 goto nla_put_failure;
1275
1276         return genlmsg_end(skb, ovs_header);
1277
1278 nla_put_failure:
1279         genlmsg_cancel(skb, ovs_header);
1280 error:
1281         return -EMSGSIZE;
1282 }
1283
1284 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1285 {
1286         return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1287 }
1288
1289 /* Called with rcu_read_lock or ovs_mutex. */
1290 static struct datapath *lookup_datapath(struct net *net,
1291                                         struct ovs_header *ovs_header,
1292                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1293 {
1294         struct datapath *dp;
1295
1296         if (!a[OVS_DP_ATTR_NAME])
1297                 dp = get_dp(net, ovs_header->dp_ifindex);
1298         else {
1299                 struct vport *vport;
1300
1301                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1302                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1303         }
1304         return dp ? dp : ERR_PTR(-ENODEV);
1305 }
1306
1307 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1308 {
1309         struct datapath *dp;
1310
1311         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1312         if (IS_ERR(dp))
1313                 return;
1314
1315         WARN(dp->user_features, "Dropping previously announced user features\n");
1316         dp->user_features = 0;
1317 }
1318
1319 static void ovs_dp_change(struct datapath *dp, struct nlattr **a)
1320 {
1321         if (a[OVS_DP_ATTR_USER_FEATURES])
1322                 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1323 }
1324
1325 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1326 {
1327         struct nlattr **a = info->attrs;
1328         struct vport_parms parms;
1329         struct sk_buff *reply;
1330         struct datapath *dp;
1331         struct vport *vport;
1332         struct ovs_net *ovs_net;
1333         int err, i;
1334
1335         err = -EINVAL;
1336         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1337                 goto err;
1338
1339         reply = ovs_dp_cmd_alloc_info(info);
1340         if (!reply)
1341                 return -ENOMEM;
1342
1343         err = -ENOMEM;
1344         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1345         if (dp == NULL)
1346                 goto err_free_reply;
1347
1348         ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1349
1350         /* Allocate table. */
1351         err = ovs_flow_tbl_init(&dp->table);
1352         if (err)
1353                 goto err_free_dp;
1354
1355         dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1356         if (!dp->stats_percpu) {
1357                 err = -ENOMEM;
1358                 goto err_destroy_table;
1359         }
1360
1361         dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1362                             GFP_KERNEL);
1363         if (!dp->ports) {
1364                 err = -ENOMEM;
1365                 goto err_destroy_percpu;
1366         }
1367
1368         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1369                 INIT_HLIST_HEAD(&dp->ports[i]);
1370
1371         /* Set up our datapath device. */
1372         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1373         parms.type = OVS_VPORT_TYPE_INTERNAL;
1374         parms.options = NULL;
1375         parms.dp = dp;
1376         parms.port_no = OVSP_LOCAL;
1377         parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1378
1379         ovs_dp_change(dp, a);
1380
1381         /* So far only local changes have been made, now need the lock. */
1382         ovs_lock();
1383
1384         vport = new_vport(&parms);
1385         if (IS_ERR(vport)) {
1386                 err = PTR_ERR(vport);
1387                 if (err == -EBUSY)
1388                         err = -EEXIST;
1389
1390                 if (err == -EEXIST) {
1391                         /* An outdated user space instance that does not understand
1392                          * the concept of user_features has attempted to create a new
1393                          * datapath and is likely to reuse it. Drop all user features.
1394                          */
1395                         if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1396                                 ovs_dp_reset_user_features(skb, info);
1397                 }
1398
1399                 goto err_destroy_ports_array;
1400         }
1401
1402         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1403                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1404         BUG_ON(err < 0);
1405
1406         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1407         list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1408
1409         ovs_unlock();
1410
1411         ovs_notify(&dp_datapath_genl_family, reply, info);
1412         return 0;
1413
1414 err_destroy_ports_array:
1415         ovs_unlock();
1416         kfree(dp->ports);
1417 err_destroy_percpu:
1418         free_percpu(dp->stats_percpu);
1419 err_destroy_table:
1420         ovs_flow_tbl_destroy(&dp->table, false);
1421 err_free_dp:
1422         release_net(ovs_dp_get_net(dp));
1423         kfree(dp);
1424 err_free_reply:
1425         kfree_skb(reply);
1426 err:
1427         return err;
1428 }
1429
1430 /* Called with ovs_mutex. */
1431 static void __dp_destroy(struct datapath *dp)
1432 {
1433         int i;
1434
1435         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1436                 struct vport *vport;
1437                 struct hlist_node *n;
1438
1439                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1440                         if (vport->port_no != OVSP_LOCAL)
1441                                 ovs_dp_detach_port(vport);
1442         }
1443
1444         list_del_rcu(&dp->list_node);
1445
1446         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1447          * all ports in datapath are destroyed first before freeing datapath.
1448          */
1449         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1450
1451         /* RCU destroy the flow table */
1452         ovs_flow_tbl_destroy(&dp->table, true);
1453
1454         call_rcu(&dp->rcu, destroy_dp_rcu);
1455 }
1456
1457 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1458 {
1459         struct sk_buff *reply;
1460         struct datapath *dp;
1461         int err;
1462
1463         reply = ovs_dp_cmd_alloc_info(info);
1464         if (!reply)
1465                 return -ENOMEM;
1466
1467         ovs_lock();
1468         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1469         err = PTR_ERR(dp);
1470         if (IS_ERR(dp))
1471                 goto err_unlock_free;
1472
1473         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1474                                    info->snd_seq, 0, OVS_DP_CMD_DEL);
1475         BUG_ON(err < 0);
1476
1477         __dp_destroy(dp);
1478         ovs_unlock();
1479
1480         ovs_notify(&dp_datapath_genl_family, reply, info);
1481
1482         return 0;
1483
1484 err_unlock_free:
1485         ovs_unlock();
1486         kfree_skb(reply);
1487         return err;
1488 }
1489
1490 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1491 {
1492         struct sk_buff *reply;
1493         struct datapath *dp;
1494         int err;
1495
1496         reply = ovs_dp_cmd_alloc_info(info);
1497         if (!reply)
1498                 return -ENOMEM;
1499
1500         ovs_lock();
1501         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1502         err = PTR_ERR(dp);
1503         if (IS_ERR(dp))
1504                 goto err_unlock_free;
1505
1506         ovs_dp_change(dp, info->attrs);
1507
1508         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1509                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1510         BUG_ON(err < 0);
1511
1512         ovs_unlock();
1513         ovs_notify(&dp_datapath_genl_family, reply, info);
1514
1515         return 0;
1516
1517 err_unlock_free:
1518         ovs_unlock();
1519         kfree_skb(reply);
1520         return err;
1521 }
1522
1523 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1524 {
1525         struct sk_buff *reply;
1526         struct datapath *dp;
1527         int err;
1528
1529         reply = ovs_dp_cmd_alloc_info(info);
1530         if (!reply)
1531                 return -ENOMEM;
1532
1533         rcu_read_lock();
1534         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1535         if (IS_ERR(dp)) {
1536                 err = PTR_ERR(dp);
1537                 goto err_unlock_free;
1538         }
1539         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1540                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1541         BUG_ON(err < 0);
1542         rcu_read_unlock();
1543
1544         return genlmsg_reply(reply, info);
1545
1546 err_unlock_free:
1547         rcu_read_unlock();
1548         kfree_skb(reply);
1549         return err;
1550 }
1551
1552 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1553 {
1554         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1555         struct datapath *dp;
1556         int skip = cb->args[0];
1557         int i = 0;
1558
1559         rcu_read_lock();
1560         list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1561                 if (i >= skip &&
1562                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1563                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1564                                          OVS_DP_CMD_NEW) < 0)
1565                         break;
1566                 i++;
1567         }
1568         rcu_read_unlock();
1569
1570         cb->args[0] = i;
1571
1572         return skb->len;
1573 }
1574
1575 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1576         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1577         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1578         [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1579 };
1580
1581 static const struct genl_ops dp_datapath_genl_ops[] = {
1582         { .cmd = OVS_DP_CMD_NEW,
1583           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1584           .policy = datapath_policy,
1585           .doit = ovs_dp_cmd_new
1586         },
1587         { .cmd = OVS_DP_CMD_DEL,
1588           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1589           .policy = datapath_policy,
1590           .doit = ovs_dp_cmd_del
1591         },
1592         { .cmd = OVS_DP_CMD_GET,
1593           .flags = 0,               /* OK for unprivileged users. */
1594           .policy = datapath_policy,
1595           .doit = ovs_dp_cmd_get,
1596           .dumpit = ovs_dp_cmd_dump
1597         },
1598         { .cmd = OVS_DP_CMD_SET,
1599           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1600           .policy = datapath_policy,
1601           .doit = ovs_dp_cmd_set,
1602         },
1603 };
1604
1605 static struct genl_family dp_datapath_genl_family = {
1606         .id = GENL_ID_GENERATE,
1607         .hdrsize = sizeof(struct ovs_header),
1608         .name = OVS_DATAPATH_FAMILY,
1609         .version = OVS_DATAPATH_VERSION,
1610         .maxattr = OVS_DP_ATTR_MAX,
1611         .netnsok = true,
1612         .parallel_ops = true,
1613         .ops = dp_datapath_genl_ops,
1614         .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1615         .mcgrps = &ovs_dp_datapath_multicast_group,
1616         .n_mcgrps = 1,
1617 };
1618
1619 /* Called with ovs_mutex or RCU read lock. */
1620 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1621                                    u32 portid, u32 seq, u32 flags, u8 cmd)
1622 {
1623         struct ovs_header *ovs_header;
1624         struct ovs_vport_stats vport_stats;
1625         int err;
1626
1627         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1628                                  flags, cmd);
1629         if (!ovs_header)
1630                 return -EMSGSIZE;
1631
1632         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1633
1634         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1635             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1636             nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1637                            vport->ops->get_name(vport)))
1638                 goto nla_put_failure;
1639
1640         ovs_vport_get_stats(vport, &vport_stats);
1641         if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1642                     &vport_stats))
1643                 goto nla_put_failure;
1644
1645         if (ovs_vport_get_upcall_portids(vport, skb))
1646                 goto nla_put_failure;
1647
1648         err = ovs_vport_get_options(vport, skb);
1649         if (err == -EMSGSIZE)
1650                 goto error;
1651
1652         return genlmsg_end(skb, ovs_header);
1653
1654 nla_put_failure:
1655         err = -EMSGSIZE;
1656 error:
1657         genlmsg_cancel(skb, ovs_header);
1658         return err;
1659 }
1660
1661 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1662 {
1663         return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1664 }
1665
1666 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1667 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1668                                          u32 seq, u8 cmd)
1669 {
1670         struct sk_buff *skb;
1671         int retval;
1672
1673         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1674         if (!skb)
1675                 return ERR_PTR(-ENOMEM);
1676
1677         retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1678         BUG_ON(retval < 0);
1679
1680         return skb;
1681 }
1682
1683 /* Called with ovs_mutex or RCU read lock. */
1684 static struct vport *lookup_vport(struct net *net,
1685                                   struct ovs_header *ovs_header,
1686                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1687 {
1688         struct datapath *dp;
1689         struct vport *vport;
1690
1691         if (a[OVS_VPORT_ATTR_NAME]) {
1692                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1693                 if (!vport)
1694                         return ERR_PTR(-ENODEV);
1695                 if (ovs_header->dp_ifindex &&
1696                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1697                         return ERR_PTR(-ENODEV);
1698                 return vport;
1699         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1700                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1701
1702                 if (port_no >= DP_MAX_PORTS)
1703                         return ERR_PTR(-EFBIG);
1704
1705                 dp = get_dp(net, ovs_header->dp_ifindex);
1706                 if (!dp)
1707                         return ERR_PTR(-ENODEV);
1708
1709                 vport = ovs_vport_ovsl_rcu(dp, port_no);
1710                 if (!vport)
1711                         return ERR_PTR(-ENODEV);
1712                 return vport;
1713         } else
1714                 return ERR_PTR(-EINVAL);
1715 }
1716
1717 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1718 {
1719         struct nlattr **a = info->attrs;
1720         struct ovs_header *ovs_header = info->userhdr;
1721         struct vport_parms parms;
1722         struct sk_buff *reply;
1723         struct vport *vport;
1724         struct datapath *dp;
1725         u32 port_no;
1726         int err;
1727
1728         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1729             !a[OVS_VPORT_ATTR_UPCALL_PID])
1730                 return -EINVAL;
1731
1732         port_no = a[OVS_VPORT_ATTR_PORT_NO]
1733                 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1734         if (port_no >= DP_MAX_PORTS)
1735                 return -EFBIG;
1736
1737         reply = ovs_vport_cmd_alloc_info();
1738         if (!reply)
1739                 return -ENOMEM;
1740
1741         ovs_lock();
1742         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1743         err = -ENODEV;
1744         if (!dp)
1745                 goto exit_unlock_free;
1746
1747         if (port_no) {
1748                 vport = ovs_vport_ovsl(dp, port_no);
1749                 err = -EBUSY;
1750                 if (vport)
1751                         goto exit_unlock_free;
1752         } else {
1753                 for (port_no = 1; ; port_no++) {
1754                         if (port_no >= DP_MAX_PORTS) {
1755                                 err = -EFBIG;
1756                                 goto exit_unlock_free;
1757                         }
1758                         vport = ovs_vport_ovsl(dp, port_no);
1759                         if (!vport)
1760                                 break;
1761                 }
1762         }
1763
1764         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1765         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1766         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1767         parms.dp = dp;
1768         parms.port_no = port_no;
1769         parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1770
1771         vport = new_vport(&parms);
1772         err = PTR_ERR(vport);
1773         if (IS_ERR(vport))
1774                 goto exit_unlock_free;
1775
1776         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1777                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1778         BUG_ON(err < 0);
1779         ovs_unlock();
1780
1781         ovs_notify(&dp_vport_genl_family, reply, info);
1782         return 0;
1783
1784 exit_unlock_free:
1785         ovs_unlock();
1786         kfree_skb(reply);
1787         return err;
1788 }
1789
1790 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1791 {
1792         struct nlattr **a = info->attrs;
1793         struct sk_buff *reply;
1794         struct vport *vport;
1795         int err;
1796
1797         reply = ovs_vport_cmd_alloc_info();
1798         if (!reply)
1799                 return -ENOMEM;
1800
1801         ovs_lock();
1802         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1803         err = PTR_ERR(vport);
1804         if (IS_ERR(vport))
1805                 goto exit_unlock_free;
1806
1807         if (a[OVS_VPORT_ATTR_TYPE] &&
1808             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1809                 err = -EINVAL;
1810                 goto exit_unlock_free;
1811         }
1812
1813         if (a[OVS_VPORT_ATTR_OPTIONS]) {
1814                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1815                 if (err)
1816                         goto exit_unlock_free;
1817         }
1818
1819
1820         if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
1821                 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
1822
1823                 err = ovs_vport_set_upcall_portids(vport, ids);
1824                 if (err)
1825                         goto exit_unlock_free;
1826         }
1827
1828         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1829                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1830         BUG_ON(err < 0);
1831
1832         ovs_unlock();
1833         ovs_notify(&dp_vport_genl_family, reply, info);
1834         return 0;
1835
1836 exit_unlock_free:
1837         ovs_unlock();
1838         kfree_skb(reply);
1839         return err;
1840 }
1841
1842 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1843 {
1844         struct nlattr **a = info->attrs;
1845         struct sk_buff *reply;
1846         struct vport *vport;
1847         int err;
1848
1849         reply = ovs_vport_cmd_alloc_info();
1850         if (!reply)
1851                 return -ENOMEM;
1852
1853         ovs_lock();
1854         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1855         err = PTR_ERR(vport);
1856         if (IS_ERR(vport))
1857                 goto exit_unlock_free;
1858
1859         if (vport->port_no == OVSP_LOCAL) {
1860                 err = -EINVAL;
1861                 goto exit_unlock_free;
1862         }
1863
1864         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1865                                       info->snd_seq, 0, OVS_VPORT_CMD_DEL);
1866         BUG_ON(err < 0);
1867         ovs_dp_detach_port(vport);
1868         ovs_unlock();
1869
1870         ovs_notify(&dp_vport_genl_family, reply, info);
1871         return 0;
1872
1873 exit_unlock_free:
1874         ovs_unlock();
1875         kfree_skb(reply);
1876         return err;
1877 }
1878
1879 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1880 {
1881         struct nlattr **a = info->attrs;
1882         struct ovs_header *ovs_header = info->userhdr;
1883         struct sk_buff *reply;
1884         struct vport *vport;
1885         int err;
1886
1887         reply = ovs_vport_cmd_alloc_info();
1888         if (!reply)
1889                 return -ENOMEM;
1890
1891         rcu_read_lock();
1892         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1893         err = PTR_ERR(vport);
1894         if (IS_ERR(vport))
1895                 goto exit_unlock_free;
1896         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1897                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1898         BUG_ON(err < 0);
1899         rcu_read_unlock();
1900
1901         return genlmsg_reply(reply, info);
1902
1903 exit_unlock_free:
1904         rcu_read_unlock();
1905         kfree_skb(reply);
1906         return err;
1907 }
1908
1909 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1910 {
1911         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1912         struct datapath *dp;
1913         int bucket = cb->args[0], skip = cb->args[1];
1914         int i, j = 0;
1915
1916         rcu_read_lock();
1917         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1918         if (!dp) {
1919                 rcu_read_unlock();
1920                 return -ENODEV;
1921         }
1922         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1923                 struct vport *vport;
1924
1925                 j = 0;
1926                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1927                         if (j >= skip &&
1928                             ovs_vport_cmd_fill_info(vport, skb,
1929                                                     NETLINK_CB(cb->skb).portid,
1930                                                     cb->nlh->nlmsg_seq,
1931                                                     NLM_F_MULTI,
1932                                                     OVS_VPORT_CMD_NEW) < 0)
1933                                 goto out;
1934
1935                         j++;
1936                 }
1937                 skip = 0;
1938         }
1939 out:
1940         rcu_read_unlock();
1941
1942         cb->args[0] = i;
1943         cb->args[1] = j;
1944
1945         return skb->len;
1946 }
1947
1948 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1949         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1950         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1951         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1952         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1953         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1954         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1955 };
1956
1957 static const struct genl_ops dp_vport_genl_ops[] = {
1958         { .cmd = OVS_VPORT_CMD_NEW,
1959           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1960           .policy = vport_policy,
1961           .doit = ovs_vport_cmd_new
1962         },
1963         { .cmd = OVS_VPORT_CMD_DEL,
1964           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1965           .policy = vport_policy,
1966           .doit = ovs_vport_cmd_del
1967         },
1968         { .cmd = OVS_VPORT_CMD_GET,
1969           .flags = 0,               /* OK for unprivileged users. */
1970           .policy = vport_policy,
1971           .doit = ovs_vport_cmd_get,
1972           .dumpit = ovs_vport_cmd_dump
1973         },
1974         { .cmd = OVS_VPORT_CMD_SET,
1975           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1976           .policy = vport_policy,
1977           .doit = ovs_vport_cmd_set,
1978         },
1979 };
1980
1981 struct genl_family dp_vport_genl_family = {
1982         .id = GENL_ID_GENERATE,
1983         .hdrsize = sizeof(struct ovs_header),
1984         .name = OVS_VPORT_FAMILY,
1985         .version = OVS_VPORT_VERSION,
1986         .maxattr = OVS_VPORT_ATTR_MAX,
1987         .netnsok = true,
1988         .parallel_ops = true,
1989         .ops = dp_vport_genl_ops,
1990         .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
1991         .mcgrps = &ovs_dp_vport_multicast_group,
1992         .n_mcgrps = 1,
1993 };
1994
1995 static struct genl_family * const dp_genl_families[] = {
1996         &dp_datapath_genl_family,
1997         &dp_vport_genl_family,
1998         &dp_flow_genl_family,
1999         &dp_packet_genl_family,
2000 };
2001
2002 static void dp_unregister_genl(int n_families)
2003 {
2004         int i;
2005
2006         for (i = 0; i < n_families; i++)
2007                 genl_unregister_family(dp_genl_families[i]);
2008 }
2009
2010 static int dp_register_genl(void)
2011 {
2012         int err;
2013         int i;
2014
2015         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2016
2017                 err = genl_register_family(dp_genl_families[i]);
2018                 if (err)
2019                         goto error;
2020         }
2021
2022         return 0;
2023
2024 error:
2025         dp_unregister_genl(i);
2026         return err;
2027 }
2028
2029 static int __net_init ovs_init_net(struct net *net)
2030 {
2031         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2032
2033         INIT_LIST_HEAD(&ovs_net->dps);
2034         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2035         return 0;
2036 }
2037
2038 static void __net_exit ovs_exit_net(struct net *net)
2039 {
2040         struct datapath *dp, *dp_next;
2041         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2042
2043         ovs_lock();
2044         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2045                 __dp_destroy(dp);
2046         ovs_unlock();
2047
2048         cancel_work_sync(&ovs_net->dp_notify_work);
2049 }
2050
2051 static struct pernet_operations ovs_net_ops = {
2052         .init = ovs_init_net,
2053         .exit = ovs_exit_net,
2054         .id   = &ovs_net_id,
2055         .size = sizeof(struct ovs_net),
2056 };
2057
2058 static int __init dp_init(void)
2059 {
2060         int err;
2061
2062         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2063
2064         pr_info("Open vSwitch switching datapath\n");
2065
2066         err = ovs_internal_dev_rtnl_link_register();
2067         if (err)
2068                 goto error;
2069
2070         err = ovs_flow_init();
2071         if (err)
2072                 goto error_unreg_rtnl_link;
2073
2074         err = ovs_vport_init();
2075         if (err)
2076                 goto error_flow_exit;
2077
2078         err = register_pernet_device(&ovs_net_ops);
2079         if (err)
2080                 goto error_vport_exit;
2081
2082         err = register_netdevice_notifier(&ovs_dp_device_notifier);
2083         if (err)
2084                 goto error_netns_exit;
2085
2086         err = dp_register_genl();
2087         if (err < 0)
2088                 goto error_unreg_notifier;
2089
2090         return 0;
2091
2092 error_unreg_notifier:
2093         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2094 error_netns_exit:
2095         unregister_pernet_device(&ovs_net_ops);
2096 error_vport_exit:
2097         ovs_vport_exit();
2098 error_flow_exit:
2099         ovs_flow_exit();
2100 error_unreg_rtnl_link:
2101         ovs_internal_dev_rtnl_link_unregister();
2102 error:
2103         return err;
2104 }
2105
2106 static void dp_cleanup(void)
2107 {
2108         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2109         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2110         unregister_pernet_device(&ovs_net_ops);
2111         rcu_barrier();
2112         ovs_vport_exit();
2113         ovs_flow_exit();
2114         ovs_internal_dev_rtnl_link_unregister();
2115 }
2116
2117 module_init(dp_init);
2118 module_exit(dp_cleanup);
2119
2120 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2121 MODULE_LICENSE("GPL");