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 ovs_vport_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 = 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         kfree(dp->ports);
 207         kfree(dp);
 208 }
 209
 210 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
 211                                             u16 port_no)
 212 {
 213         return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
 214 }
 215
 216 /* Called with ovs_mutex or RCU read lock. */
 217 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
 218 {
 219         struct vport *vport;
 220         struct hlist_head *head;
 221
 222         head = vport_hash_bucket(dp, port_no);
 223         hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
 224                 if (vport->port_no == port_no)
 225                         return vport;
 226         }
 227         return NULL;
 228 }
 229
 230 /* Called with ovs_mutex. */
 231 static struct vport *new_vport(const struct vport_parms *parms)
 232 {
 233         struct vport *vport;
 234
 235         vport = ovs_vport_add(parms);
 236         if (!IS_ERR(vport)) {
 237                 struct datapath *dp = parms->dp;
 238                 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
 239
 240                 hlist_add_head_rcu(&vport->dp_hash_node, head);
 241         }
 242         return vport;
 243 }
 244
 245 void ovs_dp_detach_port(struct vport *p)
 246 {
 247         ASSERT_OVSL();
 248
 249         /* First drop references to device. */
 250         hlist_del_rcu(&p->dp_hash_node);
 251
 252         /* Then destroy it. */
 253         ovs_vport_del(p);
 254 }
 255
 256 /* Must be called with rcu_read_lock. */
 257 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
 258 {
 259         const struct vport *p = OVS_CB(skb)->input_vport;
 260         struct datapath *dp = p->dp;
 261         struct sw_flow *flow;
 262         struct sw_flow_actions *sf_acts;
 263         struct dp_stats_percpu *stats;
 264         u64 *stats_counter;
 265         u32 n_mask_hit;
 266
 267         stats = this_cpu_ptr(dp->stats_percpu);
 268
 269         /* Look up flow. */
 270         flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
 271         if (unlikely(!flow)) {
 272                 struct dp_upcall_info upcall;
 273                 int error;
 274
 275                 memset(&upcall, 0, sizeof(upcall));
 276                 upcall.cmd = OVS_PACKET_CMD_MISS;
 277                 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
 278                 upcall.mru = OVS_CB(skb)->mru;
 279                 error = ovs_dp_upcall(dp, skb, key, &upcall);
 280                 if (unlikely(error))
 281                         kfree_skb(skb);
 282                 else
 283                         consume_skb(skb);
 284                 stats_counter = &stats->n_missed;
 285                 goto out;
 286         }
 287
 288         ovs_flow_stats_update(flow, key->tp.flags, skb);
 289         sf_acts = rcu_dereference(flow->sf_acts);
 290         ovs_execute_actions(dp, skb, sf_acts, key);
 291
 292         stats_counter = &stats->n_hit;
 293
 294 out:
 295         /* Update datapath statistics. */
 296         u64_stats_update_begin(&stats->syncp);
 297         (*stats_counter)++;
 298         stats->n_mask_hit += n_mask_hit;
 299         u64_stats_update_end(&stats->syncp);
 300 }
 301
 302 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
 303                   const struct sw_flow_key *key,
 304                   const struct dp_upcall_info *upcall_info)
 305 {
 306         struct dp_stats_percpu *stats;
 307         int err;
 308
 309         if (upcall_info->portid == 0) {
 310                 err = -ENOTCONN;
 311                 goto err;
 312         }
 313
 314         if (!skb_is_gso(skb))
 315                 err = queue_userspace_packet(dp, skb, key, upcall_info);
 316         else
 317                 err = queue_gso_packets(dp, skb, key, upcall_info);
 318         if (err)
 319                 goto err;
 320
 321         return 0;
 322
 323 err:
 324         stats = this_cpu_ptr(dp->stats_percpu);
 325
 326         u64_stats_update_begin(&stats->syncp);
 327         stats->n_lost++;
 328         u64_stats_update_end(&stats->syncp);
 329
 330         return err;
 331 }
 332
 333 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
 334                              const struct sw_flow_key *key,
 335                              const struct dp_upcall_info *upcall_info)
 336 {
 337         unsigned short gso_type = skb_shinfo(skb)->gso_type;
 338         struct sw_flow_key later_key;
 339         struct sk_buff *segs, *nskb;
 340         struct ovs_skb_cb ovs_cb;
 341         int err;
 342
 343         ovs_cb = *OVS_CB(skb);
 344         segs = __skb_gso_segment(skb, NETIF_F_SG, false);
 345         *OVS_CB(skb) = ovs_cb;
 346         if (IS_ERR(segs))
 347                 return PTR_ERR(segs);
 348         if (segs == NULL)
 349                 return -EINVAL;
 350
 351         if (gso_type & SKB_GSO_UDP) {
 352                 /* The initial flow key extracted by ovs_flow_key_extract()
 353                  * in this case is for a first fragment, so we need to
 354                  * properly mark later fragments.
 355                  */
 356                 later_key = *key;
 357                 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
 358         }
 359
 360         /* Queue all of the segments. */
 361         skb = segs;
 362         do {
 363                 *OVS_CB(skb) = ovs_cb;
 364                 if (gso_type & SKB_GSO_UDP && skb != segs)
 365                         key = &later_key;
 366
 367                 err = queue_userspace_packet(dp, skb, key, upcall_info);
 368                 if (err)
 369                         break;
 370
 371         } while ((skb = skb->next));
 372
 373         /* Free all of the segments. */
 374         skb = segs;
 375         do {
 376                 nskb = skb->next;
 377                 if (err)
 378                         kfree_skb(skb);
 379                 else
 380                         consume_skb(skb);
 381         } while ((skb = nskb));
 382         return err;
 383 }
 384
 385 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
 386                               unsigned int hdrlen)
 387 {
 388         size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
 389                 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
 390                 + nla_total_size(ovs_key_attr_size()); /* OVS_PACKET_ATTR_KEY */
 391
 392         /* OVS_PACKET_ATTR_USERDATA */
 393         if (upcall_info->userdata)
 394                 size += NLA_ALIGN(upcall_info->userdata->nla_len);
 395
 396         /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
 397         if (upcall_info->egress_tun_info)
 398                 size += nla_total_size(ovs_tun_key_attr_size());
 399
 400         /* OVS_PACKET_ATTR_ACTIONS */
 401         if (upcall_info->actions_len)
 402                 size += nla_total_size(upcall_info->actions_len);
 403
 404         /* OVS_PACKET_ATTR_MRU */
 405         if (upcall_info->mru)
 406                 size += nla_total_size(sizeof(upcall_info->mru));
 407
 408         return size;
 409 }
 410
 411 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
 412 {
 413         if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
 414                 size_t plen = NLA_ALIGN(skb->len) - skb->len;
 415
 416                 if (plen > 0)
 417                         memset(skb_put(skb, plen), 0, plen);
 418         }
 419 }
 420
 421 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
 422                                   const struct sw_flow_key *key,
 423                                   const struct dp_upcall_info *upcall_info)
 424 {
 425         struct ovs_header *upcall;
 426         struct sk_buff *nskb = NULL;
 427         struct sk_buff *user_skb = NULL; /* to be queued to userspace */
 428         struct nlattr *nla;
 429         struct genl_info info = {
 430                 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
 431                 .snd_portid = upcall_info->portid,
 432         };
 433         size_t len;
 434         unsigned int hlen;
 435         int err, dp_ifindex;
 436
 437         dp_ifindex = get_dpifindex(dp);
 438         if (!dp_ifindex)
 439                 return -ENODEV;
 440
 441         if (skb_vlan_tag_present(skb)) {
 442                 nskb = skb_clone(skb, GFP_ATOMIC);
 443                 if (!nskb)
 444                         return -ENOMEM;
 445
 446                 nskb = __vlan_hwaccel_push_inside(nskb);
 447                 if (!nskb)
 448                         return -ENOMEM;
 449
 450                 skb = nskb;
 451         }
 452
 453         if (nla_attr_size(skb->len) > USHRT_MAX) {
 454                 err = -EFBIG;
 455                 goto out;
 456         }
 457
 458         /* Complete checksum if needed */
 459         if (skb->ip_summed == CHECKSUM_PARTIAL &&
 460             (err = skb_checksum_help(skb)))
 461                 goto out;
 462
 463         /* Older versions of OVS user space enforce alignment of the last
 464          * Netlink attribute to NLA_ALIGNTO which would require extensive
 465          * padding logic. Only perform zerocopy if padding is not required.
 466          */
 467         if (dp->user_features & OVS_DP_F_UNALIGNED)
 468                 hlen = skb_zerocopy_headlen(skb);
 469         else
 470                 hlen = skb->len;
 471
 472         len = upcall_msg_size(upcall_info, hlen);
 473         user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
 474         if (!user_skb) {
 475                 err = -ENOMEM;
 476                 goto out;
 477         }
 478
 479         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
 480                              0, upcall_info->cmd);
 481         upcall->dp_ifindex = dp_ifindex;
 482
 483         err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
 484         BUG_ON(err);
 485
 486         if (upcall_info->userdata)
 487                 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
 488                           nla_len(upcall_info->userdata),
 489                           nla_data(upcall_info->userdata));
 490
 491         if (upcall_info->egress_tun_info) {
 492                 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
 493                 err = ovs_nla_put_tunnel_info(user_skb,
 494                                               upcall_info->egress_tun_info);
 495                 BUG_ON(err);
 496                 nla_nest_end(user_skb, nla);
 497         }
 498
 499         if (upcall_info->actions_len) {
 500                 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
 501                 err = ovs_nla_put_actions(upcall_info->actions,
 502                                           upcall_info->actions_len,
 503                                           user_skb);
 504                 if (!err)
 505                         nla_nest_end(user_skb, nla);
 506                 else
 507                         nla_nest_cancel(user_skb, nla);
 508         }
 509
 510         /* Add OVS_PACKET_ATTR_MRU */
 511         if (upcall_info->mru) {
 512                 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
 513                                 upcall_info->mru)) {
 514                         err = -ENOBUFS;
 515                         goto out;
 516                 }
 517                 pad_packet(dp, user_skb);
 518         }
 519
 520         /* Only reserve room for attribute header, packet data is added
 521          * in skb_zerocopy() */
 522         if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
 523                 err = -ENOBUFS;
 524                 goto out;
 525         }
 526         nla->nla_len = nla_attr_size(skb->len);
 527
 528         err = skb_zerocopy(user_skb, skb, skb->len, hlen);
 529         if (err)
 530                 goto out;
 531
 532         /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
 533         pad_packet(dp, user_skb);
 534
 535         ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
 536
 537         err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
 538         user_skb = NULL;
 539 out:
 540         if (err)
 541                 skb_tx_error(skb);
 542         kfree_skb(user_skb);
 543         kfree_skb(nskb);
 544         return err;
 545 }
 546
 547 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 548 {
 549         struct ovs_header *ovs_header = info->userhdr;
 550         struct net *net = sock_net(skb->sk);
 551         struct nlattr **a = info->attrs;
 552         struct sw_flow_actions *acts;
 553         struct sk_buff *packet;
 554         struct sw_flow *flow;
 555         struct sw_flow_actions *sf_acts;
 556         struct datapath *dp;
 557         struct ethhdr *eth;
 558         struct vport *input_vport;
 559         u16 mru = 0;
 560         int len;
 561         int err;
 562         bool log = !a[OVS_PACKET_ATTR_PROBE];
 563
 564         err = -EINVAL;
 565         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 566             !a[OVS_PACKET_ATTR_ACTIONS])
 567                 goto err;
 568
 569         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 570         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 571         err = -ENOMEM;
 572         if (!packet)
 573                 goto err;
 574         skb_reserve(packet, NET_IP_ALIGN);
 575
 576         nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
 577
 578         skb_reset_mac_header(packet);
 579         eth = eth_hdr(packet);
 580
 581         /* Normally, setting the skb 'protocol' field would be handled by a
 582          * call to eth_type_trans(), but it assumes there's a sending
 583          * device, which we may not have. */
 584         if (eth_proto_is_802_3(eth->h_proto))
 585                 packet->protocol = eth->h_proto;
 586         else
 587                 packet->protocol = htons(ETH_P_802_2);
 588
 589         /* Set packet's mru */
 590         if (a[OVS_PACKET_ATTR_MRU]) {
 591                 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
 592                 packet->ignore_df = 1;
 593         }
 594         OVS_CB(packet)->mru = mru;
 595
 596         /* Build an sw_flow for sending this packet. */
 597         flow = ovs_flow_alloc();
 598         err = PTR_ERR(flow);
 599         if (IS_ERR(flow))
 600                 goto err_kfree_skb;
 601
 602         err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
 603                                              packet, &flow->key, log);
 604         if (err)
 605                 goto err_flow_free;
 606
 607         err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
 608                                    &flow->key, &acts, log);
 609         if (err)
 610                 goto err_flow_free;
 611
 612         rcu_assign_pointer(flow->sf_acts, acts);
 613         packet->priority = flow->key.phy.priority;
 614         packet->mark = flow->key.phy.skb_mark;
 615
 616         rcu_read_lock();
 617         dp = get_dp_rcu(net, ovs_header->dp_ifindex);
 618         err = -ENODEV;
 619         if (!dp)
 620                 goto err_unlock;
 621
 622         input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
 623         if (!input_vport)
 624                 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
 625
 626         if (!input_vport)
 627                 goto err_unlock;
 628
 629         packet->dev = input_vport->dev;
 630         OVS_CB(packet)->input_vport = input_vport;
 631         sf_acts = rcu_dereference(flow->sf_acts);
 632
 633         local_bh_disable();
 634         err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
 635         local_bh_enable();
 636         rcu_read_unlock();
 637
 638         ovs_flow_free(flow, false);
 639         return err;
 640
 641 err_unlock:
 642         rcu_read_unlock();
 643 err_flow_free:
 644         ovs_flow_free(flow, false);
 645 err_kfree_skb:
 646         kfree_skb(packet);
 647 err:
 648         return err;
 649 }
 650
 651 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 652         [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
 653         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 654         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 655         [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
 656         [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
 657 };
 658
 659 static const struct genl_ops dp_packet_genl_ops[] = {
 660         { .cmd = OVS_PACKET_CMD_EXECUTE,
 661           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 662           .policy = packet_policy,
 663           .doit = ovs_packet_cmd_execute
 664         }
 665 };
 666
 667 static struct genl_family dp_packet_genl_family = {
 668         .id = GENL_ID_GENERATE,
 669         .hdrsize = sizeof(struct ovs_header),
 670         .name = OVS_PACKET_FAMILY,
 671         .version = OVS_PACKET_VERSION,
 672         .maxattr = OVS_PACKET_ATTR_MAX,
 673         .netnsok = true,
 674         .parallel_ops = true,
 675         .ops = dp_packet_genl_ops,
 676         .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
 677 };
 678
 679 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
 680                          struct ovs_dp_megaflow_stats *mega_stats)
 681 {
 682         int i;
 683
 684         memset(mega_stats, 0, sizeof(*mega_stats));
 685
 686         stats->n_flows = ovs_flow_tbl_count(&dp->table);
 687         mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
 688
 689         stats->n_hit = stats->n_missed = stats->n_lost = 0;
 690
 691         for_each_possible_cpu(i) {
 692                 const struct dp_stats_percpu *percpu_stats;
 693                 struct dp_stats_percpu local_stats;
 694                 unsigned int start;
 695
 696                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 697
 698                 do {
 699                         start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
 700                         local_stats = *percpu_stats;
 701                 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
 702
 703                 stats->n_hit += local_stats.n_hit;
 704                 stats->n_missed += local_stats.n_missed;
 705                 stats->n_lost += local_stats.n_lost;
 706                 mega_stats->n_mask_hit += local_stats.n_mask_hit;
 707         }
 708 }
 709
 710 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
 711 {
 712         return ovs_identifier_is_ufid(sfid) &&
 713                !(ufid_flags & OVS_UFID_F_OMIT_KEY);
 714 }
 715
 716 static bool should_fill_mask(uint32_t ufid_flags)
 717 {
 718         return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
 719 }
 720
 721 static bool should_fill_actions(uint32_t ufid_flags)
 722 {
 723         return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
 724 }
 725
 726 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
 727                                     const struct sw_flow_id *sfid,
 728                                     uint32_t ufid_flags)
 729 {
 730         size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
 731
 732         /* OVS_FLOW_ATTR_UFID */
 733         if (sfid && ovs_identifier_is_ufid(sfid))
 734                 len += nla_total_size(sfid->ufid_len);
 735
 736         /* OVS_FLOW_ATTR_KEY */
 737         if (!sfid || should_fill_key(sfid, ufid_flags))
 738                 len += nla_total_size(ovs_key_attr_size());
 739
 740         /* OVS_FLOW_ATTR_MASK */
 741         if (should_fill_mask(ufid_flags))
 742                 len += nla_total_size(ovs_key_attr_size());
 743
 744         /* OVS_FLOW_ATTR_ACTIONS */
 745         if (should_fill_actions(ufid_flags))
 746                 len += nla_total_size(acts->orig_len);
 747
 748         return len
 749                 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
 750                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
 751                 + nla_total_size(8); /* OVS_FLOW_ATTR_USED */
 752 }
 753
 754 /* Called with ovs_mutex or RCU read lock. */
 755 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
 756                                    struct sk_buff *skb)
 757 {
 758         struct ovs_flow_stats stats;
 759         __be16 tcp_flags;
 760         unsigned long used;
 761
 762         ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
 763
 764         if (used &&
 765             nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
 766                 return -EMSGSIZE;
 767
 768         if (stats.n_packets &&
 769             nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
 770                 return -EMSGSIZE;
 771
 772         if ((u8)ntohs(tcp_flags) &&
 773              nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
 774                 return -EMSGSIZE;
 775
 776         return 0;
 777 }
 778
 779 /* Called with ovs_mutex or RCU read lock. */
 780 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
 781                                      struct sk_buff *skb, int skb_orig_len)
 782 {
 783         struct nlattr *start;
 784         int err;
 785
 786         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 787          * this is the first flow to be dumped into 'skb'.  This is unusual for
 788          * Netlink but individual action lists can be longer than
 789          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 790          * The userspace caller can always fetch the actions separately if it
 791          * really wants them.  (Most userspace callers in fact don't care.)
 792          *
 793          * This can only fail for dump operations because the skb is always
 794          * properly sized for single flows.
 795          */
 796         start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
 797         if (start) {
 798                 const struct sw_flow_actions *sf_acts;
 799
 800                 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
 801                 err = ovs_nla_put_actions(sf_acts->actions,
 802                                           sf_acts->actions_len, skb);
 803
 804                 if (!err)
 805                         nla_nest_end(skb, start);
 806                 else {
 807                         if (skb_orig_len)
 808                                 return err;
 809
 810                         nla_nest_cancel(skb, start);
 811                 }
 812         } else if (skb_orig_len) {
 813                 return -EMSGSIZE;
 814         }
 815
 816         return 0;
 817 }
 818
 819 /* Called with ovs_mutex or RCU read lock. */
 820 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
 821                                   struct sk_buff *skb, u32 portid,
 822                                   u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
 823 {
 824         const int skb_orig_len = skb->len;
 825         struct ovs_header *ovs_header;
 826         int err;
 827
 828         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
 829                                  flags, cmd);
 830         if (!ovs_header)
 831                 return -EMSGSIZE;
 832
 833         ovs_header->dp_ifindex = dp_ifindex;
 834
 835         err = ovs_nla_put_identifier(flow, skb);
 836         if (err)
 837                 goto error;
 838
 839         if (should_fill_key(&flow->id, ufid_flags)) {
 840                 err = ovs_nla_put_masked_key(flow, skb);
 841                 if (err)
 842                         goto error;
 843         }
 844
 845         if (should_fill_mask(ufid_flags)) {
 846                 err = ovs_nla_put_mask(flow, skb);
 847                 if (err)
 848                         goto error;
 849         }
 850
 851         err = ovs_flow_cmd_fill_stats(flow, skb);
 852         if (err)
 853                 goto error;
 854
 855         if (should_fill_actions(ufid_flags)) {
 856                 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
 857                 if (err)
 858                         goto error;
 859         }
 860
 861         genlmsg_end(skb, ovs_header);
 862         return 0;
 863
 864 error:
 865         genlmsg_cancel(skb, ovs_header);
 866         return err;
 867 }
 868
 869 /* May not be called with RCU read lock. */
 870 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
 871                                                const struct sw_flow_id *sfid,
 872                                                struct genl_info *info,
 873                                                bool always,
 874                                                uint32_t ufid_flags)
 875 {
 876         struct sk_buff *skb;
 877         size_t len;
 878
 879         if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
 880                 return NULL;
 881
 882         len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
 883         skb = genlmsg_new_unicast(len, info, GFP_KERNEL);
 884         if (!skb)
 885                 return ERR_PTR(-ENOMEM);
 886
 887         return skb;
 888 }
 889
 890 /* Called with ovs_mutex. */
 891 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
 892                                                int dp_ifindex,
 893                                                struct genl_info *info, u8 cmd,
 894                                                bool always, u32 ufid_flags)
 895 {
 896         struct sk_buff *skb;
 897         int retval;
 898
 899         skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
 900                                       &flow->id, info, always, ufid_flags);
 901         if (IS_ERR_OR_NULL(skb))
 902                 return skb;
 903
 904         retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
 905                                         info->snd_portid, info->snd_seq, 0,
 906                                         cmd, ufid_flags);
 907         BUG_ON(retval < 0);
 908         return skb;
 909 }
 910
 911 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
 912 {
 913         struct net *net = sock_net(skb->sk);
 914         struct nlattr **a = info->attrs;
 915         struct ovs_header *ovs_header = info->userhdr;
 916         struct sw_flow *flow = NULL, *new_flow;
 917         struct sw_flow_mask mask;
 918         struct sk_buff *reply;
 919         struct datapath *dp;
 920         struct sw_flow_key key;
 921         struct sw_flow_actions *acts;
 922         struct sw_flow_match match;
 923         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
 924         int error;
 925         bool log = !a[OVS_FLOW_ATTR_PROBE];
 926
 927         /* Must have key and actions. */
 928         error = -EINVAL;
 929         if (!a[OVS_FLOW_ATTR_KEY]) {
 930                 OVS_NLERR(log, "Flow key attr not present in new flow.");
 931                 goto error;
 932         }
 933         if (!a[OVS_FLOW_ATTR_ACTIONS]) {
 934                 OVS_NLERR(log, "Flow actions attr not present in new flow.");
 935                 goto error;
 936         }
 937
 938         /* Most of the time we need to allocate a new flow, do it before
 939          * locking.
 940          */
 941         new_flow = ovs_flow_alloc();
 942         if (IS_ERR(new_flow)) {
 943                 error = PTR_ERR(new_flow);
 944                 goto error;
 945         }
 946
 947         /* Extract key. */
 948         ovs_match_init(&match, &key, &mask);
 949         error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
 950                                   a[OVS_FLOW_ATTR_MASK], log);
 951         if (error)
 952                 goto err_kfree_flow;
 953
 954         ovs_flow_mask_key(&new_flow->key, &key, true, &mask);
 955
 956         /* Extract flow identifier. */
 957         error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
 958                                        &key, log);
 959         if (error)
 960                 goto err_kfree_flow;
 961
 962         /* Validate actions. */
 963         error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
 964                                      &new_flow->key, &acts, log);
 965         if (error) {
 966                 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
 967                 goto err_kfree_flow;
 968         }
 969
 970         reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
 971                                         ufid_flags);
 972         if (IS_ERR(reply)) {
 973                 error = PTR_ERR(reply);
 974                 goto err_kfree_acts;
 975         }
 976
 977         ovs_lock();
 978         dp = get_dp(net, ovs_header->dp_ifindex);
 979         if (unlikely(!dp)) {
 980                 error = -ENODEV;
 981                 goto err_unlock_ovs;
 982         }
 983
 984         /* Check if this is a duplicate flow */
 985         if (ovs_identifier_is_ufid(&new_flow->id))
 986                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
 987         if (!flow)
 988                 flow = ovs_flow_tbl_lookup(&dp->table, &key);
 989         if (likely(!flow)) {
 990                 rcu_assign_pointer(new_flow->sf_acts, acts);
 991
 992                 /* Put flow in bucket. */
 993                 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
 994                 if (unlikely(error)) {
 995                         acts = NULL;
 996                         goto err_unlock_ovs;
 997                 }
 998
 999                 if (unlikely(reply)) {
1000                         error = ovs_flow_cmd_fill_info(new_flow,
1001                                                        ovs_header->dp_ifindex,
1002                                                        reply, info->snd_portid,
1003                                                        info->snd_seq, 0,
1004                                                        OVS_FLOW_CMD_NEW,
1005                                                        ufid_flags);
1006                         BUG_ON(error < 0);
1007                 }
1008                 ovs_unlock();
1009         } else {
1010                 struct sw_flow_actions *old_acts;
1011
1012                 /* Bail out if we're not allowed to modify an existing flow.
1013                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1014                  * because Generic Netlink treats the latter as a dump
1015                  * request.  We also accept NLM_F_EXCL in case that bug ever
1016                  * gets fixed.
1017                  */
1018                 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1019                                                          | NLM_F_EXCL))) {
1020                         error = -EEXIST;
1021                         goto err_unlock_ovs;
1022                 }
1023                 /* The flow identifier has to be the same for flow updates.
1024                  * Look for any overlapping flow.
1025                  */
1026                 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1027                         if (ovs_identifier_is_key(&flow->id))
1028                                 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1029                                                                  &match);
1030                         else /* UFID matches but key is different */
1031                                 flow = NULL;
1032                         if (!flow) {
1033                                 error = -ENOENT;
1034                                 goto err_unlock_ovs;
1035                         }
1036                 }
1037                 /* Update actions. */
1038                 old_acts = ovsl_dereference(flow->sf_acts);
1039                 rcu_assign_pointer(flow->sf_acts, acts);
1040
1041                 if (unlikely(reply)) {
1042                         error = ovs_flow_cmd_fill_info(flow,
1043                                                        ovs_header->dp_ifindex,
1044                                                        reply, info->snd_portid,
1045                                                        info->snd_seq, 0,
1046                                                        OVS_FLOW_CMD_NEW,
1047                                                        ufid_flags);
1048                         BUG_ON(error < 0);
1049                 }
1050                 ovs_unlock();
1051
1052                 ovs_nla_free_flow_actions_rcu(old_acts);
1053                 ovs_flow_free(new_flow, false);
1054         }
1055
1056         if (reply)
1057                 ovs_notify(&dp_flow_genl_family, reply, info);
1058         return 0;
1059
1060 err_unlock_ovs:
1061         ovs_unlock();
1062         kfree_skb(reply);
1063 err_kfree_acts:
1064         ovs_nla_free_flow_actions(acts);
1065 err_kfree_flow:
1066         ovs_flow_free(new_flow, false);
1067 error:
1068         return error;
1069 }
1070
1071 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1072 static struct sw_flow_actions *get_flow_actions(struct net *net,
1073                                                 const struct nlattr *a,
1074                                                 const struct sw_flow_key *key,
1075                                                 const struct sw_flow_mask *mask,
1076                                                 bool log)
1077 {
1078         struct sw_flow_actions *acts;
1079         struct sw_flow_key masked_key;
1080         int error;
1081
1082         ovs_flow_mask_key(&masked_key, key, true, mask);
1083         error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1084         if (error) {
1085                 OVS_NLERR(log,
1086                           "Actions may not be safe on all matching packets");
1087                 return ERR_PTR(error);
1088         }
1089
1090         return acts;
1091 }
1092
1093 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1094 {
1095         struct net *net = sock_net(skb->sk);
1096         struct nlattr **a = info->attrs;
1097         struct ovs_header *ovs_header = info->userhdr;
1098         struct sw_flow_key key;
1099         struct sw_flow *flow;
1100         struct sw_flow_mask mask;
1101         struct sk_buff *reply = NULL;
1102         struct datapath *dp;
1103         struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1104         struct sw_flow_match match;
1105         struct sw_flow_id sfid;
1106         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1107         int error;
1108         bool log = !a[OVS_FLOW_ATTR_PROBE];
1109         bool ufid_present;
1110
1111         /* Extract key. */
1112         error = -EINVAL;
1113         if (!a[OVS_FLOW_ATTR_KEY]) {
1114                 OVS_NLERR(log, "Flow key attribute not present in set flow.");
1115                 goto error;
1116         }
1117
1118         ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1119         ovs_match_init(&match, &key, &mask);
1120         error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1121                                   a[OVS_FLOW_ATTR_MASK], log);
1122         if (error)
1123                 goto error;
1124
1125         /* Validate actions. */
1126         if (a[OVS_FLOW_ATTR_ACTIONS]) {
1127                 acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key,
1128                                         &mask, log);
1129                 if (IS_ERR(acts)) {
1130                         error = PTR_ERR(acts);
1131                         goto error;
1132                 }
1133
1134                 /* Can allocate before locking if have acts. */
1135                 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1136                                                 ufid_flags);
1137                 if (IS_ERR(reply)) {
1138                         error = PTR_ERR(reply);
1139                         goto err_kfree_acts;
1140                 }
1141         }
1142
1143         ovs_lock();
1144         dp = get_dp(net, ovs_header->dp_ifindex);
1145         if (unlikely(!dp)) {
1146                 error = -ENODEV;
1147                 goto err_unlock_ovs;
1148         }
1149         /* Check that the flow exists. */
1150         if (ufid_present)
1151                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1152         else
1153                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1154         if (unlikely(!flow)) {
1155                 error = -ENOENT;
1156                 goto err_unlock_ovs;
1157         }
1158
1159         /* Update actions, if present. */
1160         if (likely(acts)) {
1161                 old_acts = ovsl_dereference(flow->sf_acts);
1162                 rcu_assign_pointer(flow->sf_acts, acts);
1163
1164                 if (unlikely(reply)) {
1165                         error = ovs_flow_cmd_fill_info(flow,
1166                                                        ovs_header->dp_ifindex,
1167                                                        reply, info->snd_portid,
1168                                                        info->snd_seq, 0,
1169                                                        OVS_FLOW_CMD_NEW,
1170                                                        ufid_flags);
1171                         BUG_ON(error < 0);
1172                 }
1173         } else {
1174                 /* Could not alloc without acts before locking. */
1175                 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1176                                                 info, OVS_FLOW_CMD_NEW, false,
1177                                                 ufid_flags);
1178
1179                 if (unlikely(IS_ERR(reply))) {
1180                         error = PTR_ERR(reply);
1181                         goto err_unlock_ovs;
1182                 }
1183         }
1184
1185         /* Clear stats. */
1186         if (a[OVS_FLOW_ATTR_CLEAR])
1187                 ovs_flow_stats_clear(flow);
1188         ovs_unlock();
1189
1190         if (reply)
1191                 ovs_notify(&dp_flow_genl_family, reply, info);
1192         if (old_acts)
1193                 ovs_nla_free_flow_actions_rcu(old_acts);
1194
1195         return 0;
1196
1197 err_unlock_ovs:
1198         ovs_unlock();
1199         kfree_skb(reply);
1200 err_kfree_acts:
1201         ovs_nla_free_flow_actions(acts);
1202 error:
1203         return error;
1204 }
1205
1206 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1207 {
1208         struct nlattr **a = info->attrs;
1209         struct ovs_header *ovs_header = info->userhdr;
1210         struct net *net = sock_net(skb->sk);
1211         struct sw_flow_key key;
1212         struct sk_buff *reply;
1213         struct sw_flow *flow;
1214         struct datapath *dp;
1215         struct sw_flow_match match;
1216         struct sw_flow_id ufid;
1217         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1218         int err = 0;
1219         bool log = !a[OVS_FLOW_ATTR_PROBE];
1220         bool ufid_present;
1221
1222         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1223         if (a[OVS_FLOW_ATTR_KEY]) {
1224                 ovs_match_init(&match, &key, NULL);
1225                 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1226                                         log);
1227         } else if (!ufid_present) {
1228                 OVS_NLERR(log,
1229                           "Flow get message rejected, Key attribute missing.");
1230                 err = -EINVAL;
1231         }
1232         if (err)
1233                 return err;
1234
1235         ovs_lock();
1236         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1237         if (!dp) {
1238                 err = -ENODEV;
1239                 goto unlock;
1240         }
1241
1242         if (ufid_present)
1243                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1244         else
1245                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1246         if (!flow) {
1247                 err = -ENOENT;
1248                 goto unlock;
1249         }
1250
1251         reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1252                                         OVS_FLOW_CMD_NEW, true, ufid_flags);
1253         if (IS_ERR(reply)) {
1254                 err = PTR_ERR(reply);
1255                 goto unlock;
1256         }
1257
1258         ovs_unlock();
1259         return genlmsg_reply(reply, info);
1260 unlock:
1261         ovs_unlock();
1262         return err;
1263 }
1264
1265 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1266 {
1267         struct nlattr **a = info->attrs;
1268         struct ovs_header *ovs_header = info->userhdr;
1269         struct net *net = sock_net(skb->sk);
1270         struct sw_flow_key key;
1271         struct sk_buff *reply;
1272         struct sw_flow *flow = NULL;
1273         struct datapath *dp;
1274         struct sw_flow_match match;
1275         struct sw_flow_id ufid;
1276         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1277         int err;
1278         bool log = !a[OVS_FLOW_ATTR_PROBE];
1279         bool ufid_present;
1280
1281         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1282         if (a[OVS_FLOW_ATTR_KEY]) {
1283                 ovs_match_init(&match, &key, NULL);
1284                 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1285                                         NULL, log);
1286                 if (unlikely(err))
1287                         return err;
1288         }
1289
1290         ovs_lock();
1291         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1292         if (unlikely(!dp)) {
1293                 err = -ENODEV;
1294                 goto unlock;
1295         }
1296
1297         if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1298                 err = ovs_flow_tbl_flush(&dp->table);
1299                 goto unlock;
1300         }
1301
1302         if (ufid_present)
1303                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1304         else
1305                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1306         if (unlikely(!flow)) {
1307                 err = -ENOENT;
1308                 goto unlock;
1309         }
1310
1311         ovs_flow_tbl_remove(&dp->table, flow);
1312         ovs_unlock();
1313
1314         reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1315                                         &flow->id, info, false, ufid_flags);
1316         if (likely(reply)) {
1317                 if (likely(!IS_ERR(reply))) {
1318                         rcu_read_lock();        /*To keep RCU checker happy. */
1319                         err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1320                                                      reply, info->snd_portid,
1321                                                      info->snd_seq, 0,
1322                                                      OVS_FLOW_CMD_DEL,
1323                                                      ufid_flags);
1324                         rcu_read_unlock();
1325                         BUG_ON(err < 0);
1326
1327                         ovs_notify(&dp_flow_genl_family, reply, info);
1328                 } else {
1329                         netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1330                 }
1331         }
1332
1333         ovs_flow_free(flow, true);
1334         return 0;
1335 unlock:
1336         ovs_unlock();
1337         return err;
1338 }
1339
1340 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1341 {
1342         struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1343         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1344         struct table_instance *ti;
1345         struct datapath *dp;
1346         u32 ufid_flags;
1347         int err;
1348
1349         err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1350                             OVS_FLOW_ATTR_MAX, flow_policy);
1351         if (err)
1352                 return err;
1353         ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1354
1355         rcu_read_lock();
1356         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1357         if (!dp) {
1358                 rcu_read_unlock();
1359                 return -ENODEV;
1360         }
1361
1362         ti = rcu_dereference(dp->table.ti);
1363         for (;;) {
1364                 struct sw_flow *flow;
1365                 u32 bucket, obj;
1366
1367                 bucket = cb->args[0];
1368                 obj = cb->args[1];
1369                 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1370                 if (!flow)
1371                         break;
1372
1373                 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1374                                            NETLINK_CB(cb->skb).portid,
1375                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1376                                            OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1377                         break;
1378
1379                 cb->args[0] = bucket;
1380                 cb->args[1] = obj;
1381         }
1382         rcu_read_unlock();
1383         return skb->len;
1384 }
1385
1386 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1387         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1388         [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1389         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1390         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1391         [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1392         [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1393         [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1394 };
1395
1396 static const struct genl_ops dp_flow_genl_ops[] = {
1397         { .cmd = OVS_FLOW_CMD_NEW,
1398           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1399           .policy = flow_policy,
1400           .doit = ovs_flow_cmd_new
1401         },
1402         { .cmd = OVS_FLOW_CMD_DEL,
1403           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1404           .policy = flow_policy,
1405           .doit = ovs_flow_cmd_del
1406         },
1407         { .cmd = OVS_FLOW_CMD_GET,
1408           .flags = 0,               /* OK for unprivileged users. */
1409           .policy = flow_policy,
1410           .doit = ovs_flow_cmd_get,
1411           .dumpit = ovs_flow_cmd_dump
1412         },
1413         { .cmd = OVS_FLOW_CMD_SET,
1414           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1415           .policy = flow_policy,
1416           .doit = ovs_flow_cmd_set,
1417         },
1418 };
1419
1420 static struct genl_family dp_flow_genl_family = {
1421         .id = GENL_ID_GENERATE,
1422         .hdrsize = sizeof(struct ovs_header),
1423         .name = OVS_FLOW_FAMILY,
1424         .version = OVS_FLOW_VERSION,
1425         .maxattr = OVS_FLOW_ATTR_MAX,
1426         .netnsok = true,
1427         .parallel_ops = true,
1428         .ops = dp_flow_genl_ops,
1429         .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1430         .mcgrps = &ovs_dp_flow_multicast_group,
1431         .n_mcgrps = 1,
1432 };
1433
1434 static size_t ovs_dp_cmd_msg_size(void)
1435 {
1436         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1437
1438         msgsize += nla_total_size(IFNAMSIZ);
1439         msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1440         msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1441         msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1442
1443         return msgsize;
1444 }
1445
1446 /* Called with ovs_mutex. */
1447 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1448                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1449 {
1450         struct ovs_header *ovs_header;
1451         struct ovs_dp_stats dp_stats;
1452         struct ovs_dp_megaflow_stats dp_megaflow_stats;
1453         int err;
1454
1455         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1456                                    flags, cmd);
1457         if (!ovs_header)
1458                 goto error;
1459
1460         ovs_header->dp_ifindex = get_dpifindex(dp);
1461
1462         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1463         if (err)
1464                 goto nla_put_failure;
1465
1466         get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1467         if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1468                         &dp_stats))
1469                 goto nla_put_failure;
1470
1471         if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1472                         sizeof(struct ovs_dp_megaflow_stats),
1473                         &dp_megaflow_stats))
1474                 goto nla_put_failure;
1475
1476         if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1477                 goto nla_put_failure;
1478
1479         genlmsg_end(skb, ovs_header);
1480         return 0;
1481
1482 nla_put_failure:
1483         genlmsg_cancel(skb, ovs_header);
1484 error:
1485         return -EMSGSIZE;
1486 }
1487
1488 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1489 {
1490         return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1491 }
1492
1493 /* Called with rcu_read_lock or ovs_mutex. */
1494 static struct datapath *lookup_datapath(struct net *net,
1495                                         const struct ovs_header *ovs_header,
1496                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1497 {
1498         struct datapath *dp;
1499
1500         if (!a[OVS_DP_ATTR_NAME])
1501                 dp = get_dp(net, ovs_header->dp_ifindex);
1502         else {
1503                 struct vport *vport;
1504
1505                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1506                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1507         }
1508         return dp ? dp : ERR_PTR(-ENODEV);
1509 }
1510
1511 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1512 {
1513         struct datapath *dp;
1514
1515         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1516         if (IS_ERR(dp))
1517                 return;
1518
1519         WARN(dp->user_features, "Dropping previously announced user features\n");
1520         dp->user_features = 0;
1521 }
1522
1523 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1524 {
1525         if (a[OVS_DP_ATTR_USER_FEATURES])
1526                 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1527 }
1528
1529 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1530 {
1531         struct nlattr **a = info->attrs;
1532         struct vport_parms parms;
1533         struct sk_buff *reply;
1534         struct datapath *dp;
1535         struct vport *vport;
1536         struct ovs_net *ovs_net;
1537         int err, i;
1538
1539         err = -EINVAL;
1540         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1541                 goto err;
1542
1543         reply = ovs_dp_cmd_alloc_info(info);
1544         if (!reply)
1545                 return -ENOMEM;
1546
1547         err = -ENOMEM;
1548         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1549         if (dp == NULL)
1550                 goto err_free_reply;
1551
1552         ovs_dp_set_net(dp, sock_net(skb->sk));
1553
1554         /* Allocate table. */
1555         err = ovs_flow_tbl_init(&dp->table);
1556         if (err)
1557                 goto err_free_dp;
1558
1559         dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1560         if (!dp->stats_percpu) {
1561                 err = -ENOMEM;
1562                 goto err_destroy_table;
1563         }
1564
1565         dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1566                             GFP_KERNEL);
1567         if (!dp->ports) {
1568                 err = -ENOMEM;
1569                 goto err_destroy_percpu;
1570         }
1571
1572         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1573                 INIT_HLIST_HEAD(&dp->ports[i]);
1574
1575         /* Set up our datapath device. */
1576         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1577         parms.type = OVS_VPORT_TYPE_INTERNAL;
1578         parms.options = NULL;
1579         parms.dp = dp;
1580         parms.port_no = OVSP_LOCAL;
1581         parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1582
1583         ovs_dp_change(dp, a);
1584
1585         /* So far only local changes have been made, now need the lock. */
1586         ovs_lock();
1587
1588         vport = new_vport(&parms);
1589         if (IS_ERR(vport)) {
1590                 err = PTR_ERR(vport);
1591                 if (err == -EBUSY)
1592                         err = -EEXIST;
1593
1594                 if (err == -EEXIST) {
1595                         /* An outdated user space instance that does not understand
1596                          * the concept of user_features has attempted to create a new
1597                          * datapath and is likely to reuse it. Drop all user features.
1598                          */
1599                         if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1600                                 ovs_dp_reset_user_features(skb, info);
1601                 }
1602
1603                 goto err_destroy_ports_array;
1604         }
1605
1606         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1607                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1608         BUG_ON(err < 0);
1609
1610         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1611         list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1612
1613         ovs_unlock();
1614
1615         ovs_notify(&dp_datapath_genl_family, reply, info);
1616         return 0;
1617
1618 err_destroy_ports_array:
1619         ovs_unlock();
1620         kfree(dp->ports);
1621 err_destroy_percpu:
1622         free_percpu(dp->stats_percpu);
1623 err_destroy_table:
1624         ovs_flow_tbl_destroy(&dp->table);
1625 err_free_dp:
1626         kfree(dp);
1627 err_free_reply:
1628         kfree_skb(reply);
1629 err:
1630         return err;
1631 }
1632
1633 /* Called with ovs_mutex. */
1634 static void __dp_destroy(struct datapath *dp)
1635 {
1636         int i;
1637
1638         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1639                 struct vport *vport;
1640                 struct hlist_node *n;
1641
1642                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1643                         if (vport->port_no != OVSP_LOCAL)
1644                                 ovs_dp_detach_port(vport);
1645         }
1646
1647         list_del_rcu(&dp->list_node);
1648
1649         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1650          * all ports in datapath are destroyed first before freeing datapath.
1651          */
1652         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1653
1654         /* RCU destroy the flow table */
1655         call_rcu(&dp->rcu, destroy_dp_rcu);
1656 }
1657
1658 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1659 {
1660         struct sk_buff *reply;
1661         struct datapath *dp;
1662         int err;
1663
1664         reply = ovs_dp_cmd_alloc_info(info);
1665         if (!reply)
1666                 return -ENOMEM;
1667
1668         ovs_lock();
1669         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1670         err = PTR_ERR(dp);
1671         if (IS_ERR(dp))
1672                 goto err_unlock_free;
1673
1674         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1675                                    info->snd_seq, 0, OVS_DP_CMD_DEL);
1676         BUG_ON(err < 0);
1677
1678         __dp_destroy(dp);
1679         ovs_unlock();
1680
1681         ovs_notify(&dp_datapath_genl_family, reply, info);
1682
1683         return 0;
1684
1685 err_unlock_free:
1686         ovs_unlock();
1687         kfree_skb(reply);
1688         return err;
1689 }
1690
1691 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1692 {
1693         struct sk_buff *reply;
1694         struct datapath *dp;
1695         int err;
1696
1697         reply = ovs_dp_cmd_alloc_info(info);
1698         if (!reply)
1699                 return -ENOMEM;
1700
1701         ovs_lock();
1702         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1703         err = PTR_ERR(dp);
1704         if (IS_ERR(dp))
1705                 goto err_unlock_free;
1706
1707         ovs_dp_change(dp, info->attrs);
1708
1709         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1710                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1711         BUG_ON(err < 0);
1712
1713         ovs_unlock();
1714         ovs_notify(&dp_datapath_genl_family, reply, info);
1715
1716         return 0;
1717
1718 err_unlock_free:
1719         ovs_unlock();
1720         kfree_skb(reply);
1721         return err;
1722 }
1723
1724 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1725 {
1726         struct sk_buff *reply;
1727         struct datapath *dp;
1728         int err;
1729
1730         reply = ovs_dp_cmd_alloc_info(info);
1731         if (!reply)
1732                 return -ENOMEM;
1733
1734         ovs_lock();
1735         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1736         if (IS_ERR(dp)) {
1737                 err = PTR_ERR(dp);
1738                 goto err_unlock_free;
1739         }
1740         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1741                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1742         BUG_ON(err < 0);
1743         ovs_unlock();
1744
1745         return genlmsg_reply(reply, info);
1746
1747 err_unlock_free:
1748         ovs_unlock();
1749         kfree_skb(reply);
1750         return err;
1751 }
1752
1753 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1754 {
1755         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1756         struct datapath *dp;
1757         int skip = cb->args[0];
1758         int i = 0;
1759
1760         ovs_lock();
1761         list_for_each_entry(dp, &ovs_net->dps, list_node) {
1762                 if (i >= skip &&
1763                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1764                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1765                                          OVS_DP_CMD_NEW) < 0)
1766                         break;
1767                 i++;
1768         }
1769         ovs_unlock();
1770
1771         cb->args[0] = i;
1772
1773         return skb->len;
1774 }
1775
1776 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1777         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1778         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1779         [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1780 };
1781
1782 static const struct genl_ops dp_datapath_genl_ops[] = {
1783         { .cmd = OVS_DP_CMD_NEW,
1784           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1785           .policy = datapath_policy,
1786           .doit = ovs_dp_cmd_new
1787         },
1788         { .cmd = OVS_DP_CMD_DEL,
1789           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1790           .policy = datapath_policy,
1791           .doit = ovs_dp_cmd_del
1792         },
1793         { .cmd = OVS_DP_CMD_GET,
1794           .flags = 0,               /* OK for unprivileged users. */
1795           .policy = datapath_policy,
1796           .doit = ovs_dp_cmd_get,
1797           .dumpit = ovs_dp_cmd_dump
1798         },
1799         { .cmd = OVS_DP_CMD_SET,
1800           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1801           .policy = datapath_policy,
1802           .doit = ovs_dp_cmd_set,
1803         },
1804 };
1805
1806 static struct genl_family dp_datapath_genl_family = {
1807         .id = GENL_ID_GENERATE,
1808         .hdrsize = sizeof(struct ovs_header),
1809         .name = OVS_DATAPATH_FAMILY,
1810         .version = OVS_DATAPATH_VERSION,
1811         .maxattr = OVS_DP_ATTR_MAX,
1812         .netnsok = true,
1813         .parallel_ops = true,
1814         .ops = dp_datapath_genl_ops,
1815         .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1816         .mcgrps = &ovs_dp_datapath_multicast_group,
1817         .n_mcgrps = 1,
1818 };
1819
1820 /* Called with ovs_mutex or RCU read lock. */
1821 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1822                                    u32 portid, u32 seq, u32 flags, u8 cmd)
1823 {
1824         struct ovs_header *ovs_header;
1825         struct ovs_vport_stats vport_stats;
1826         int err;
1827
1828         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1829                                  flags, cmd);
1830         if (!ovs_header)
1831                 return -EMSGSIZE;
1832
1833         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1834
1835         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1836             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1837             nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1838                            ovs_vport_name(vport)))
1839                 goto nla_put_failure;
1840
1841         ovs_vport_get_stats(vport, &vport_stats);
1842         if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1843                     &vport_stats))
1844                 goto nla_put_failure;
1845
1846         if (ovs_vport_get_upcall_portids(vport, skb))
1847                 goto nla_put_failure;
1848
1849         err = ovs_vport_get_options(vport, skb);
1850         if (err == -EMSGSIZE)
1851                 goto error;
1852
1853         genlmsg_end(skb, ovs_header);
1854         return 0;
1855
1856 nla_put_failure:
1857         err = -EMSGSIZE;
1858 error:
1859         genlmsg_cancel(skb, ovs_header);
1860         return err;
1861 }
1862
1863 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1864 {
1865         return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1866 }
1867
1868 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1869 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1870                                          u32 seq, u8 cmd)
1871 {
1872         struct sk_buff *skb;
1873         int retval;
1874
1875         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1876         if (!skb)
1877                 return ERR_PTR(-ENOMEM);
1878
1879         retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1880         BUG_ON(retval < 0);
1881
1882         return skb;
1883 }
1884
1885 /* Called with ovs_mutex or RCU read lock. */
1886 static struct vport *lookup_vport(struct net *net,
1887                                   const struct ovs_header *ovs_header,
1888                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1889 {
1890         struct datapath *dp;
1891         struct vport *vport;
1892
1893         if (a[OVS_VPORT_ATTR_NAME]) {
1894                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1895                 if (!vport)
1896                         return ERR_PTR(-ENODEV);
1897                 if (ovs_header->dp_ifindex &&
1898                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1899                         return ERR_PTR(-ENODEV);
1900                 return vport;
1901         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1902                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1903
1904                 if (port_no >= DP_MAX_PORTS)
1905                         return ERR_PTR(-EFBIG);
1906
1907                 dp = get_dp(net, ovs_header->dp_ifindex);
1908                 if (!dp)
1909                         return ERR_PTR(-ENODEV);
1910
1911                 vport = ovs_vport_ovsl_rcu(dp, port_no);
1912                 if (!vport)
1913                         return ERR_PTR(-ENODEV);
1914                 return vport;
1915         } else
1916                 return ERR_PTR(-EINVAL);
1917 }
1918
1919 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1920 {
1921         struct nlattr **a = info->attrs;
1922         struct ovs_header *ovs_header = info->userhdr;
1923         struct vport_parms parms;
1924         struct sk_buff *reply;
1925         struct vport *vport;
1926         struct datapath *dp;
1927         u32 port_no;
1928         int err;
1929
1930         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1931             !a[OVS_VPORT_ATTR_UPCALL_PID])
1932                 return -EINVAL;
1933
1934         port_no = a[OVS_VPORT_ATTR_PORT_NO]
1935                 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1936         if (port_no >= DP_MAX_PORTS)
1937                 return -EFBIG;
1938
1939         reply = ovs_vport_cmd_alloc_info();
1940         if (!reply)
1941                 return -ENOMEM;
1942
1943         ovs_lock();
1944 restart:
1945         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1946         err = -ENODEV;
1947         if (!dp)
1948                 goto exit_unlock_free;
1949
1950         if (port_no) {
1951                 vport = ovs_vport_ovsl(dp, port_no);
1952                 err = -EBUSY;
1953                 if (vport)
1954                         goto exit_unlock_free;
1955         } else {
1956                 for (port_no = 1; ; port_no++) {
1957                         if (port_no >= DP_MAX_PORTS) {
1958                                 err = -EFBIG;
1959                                 goto exit_unlock_free;
1960                         }
1961                         vport = ovs_vport_ovsl(dp, port_no);
1962                         if (!vport)
1963                                 break;
1964                 }
1965         }
1966
1967         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1968         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1969         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1970         parms.dp = dp;
1971         parms.port_no = port_no;
1972         parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1973
1974         vport = new_vport(&parms);
1975         err = PTR_ERR(vport);
1976         if (IS_ERR(vport)) {
1977                 if (err == -EAGAIN)
1978                         goto restart;
1979                 goto exit_unlock_free;
1980         }
1981
1982         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1983                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1984         BUG_ON(err < 0);
1985         ovs_unlock();
1986
1987         ovs_notify(&dp_vport_genl_family, reply, info);
1988         return 0;
1989
1990 exit_unlock_free:
1991         ovs_unlock();
1992         kfree_skb(reply);
1993         return err;
1994 }
1995
1996 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1997 {
1998         struct nlattr **a = info->attrs;
1999         struct sk_buff *reply;
2000         struct vport *vport;
2001         int err;
2002
2003         reply = ovs_vport_cmd_alloc_info();
2004         if (!reply)
2005                 return -ENOMEM;
2006
2007         ovs_lock();
2008         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2009         err = PTR_ERR(vport);
2010         if (IS_ERR(vport))
2011                 goto exit_unlock_free;
2012
2013         if (a[OVS_VPORT_ATTR_TYPE] &&
2014             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2015                 err = -EINVAL;
2016                 goto exit_unlock_free;
2017         }
2018
2019         if (a[OVS_VPORT_ATTR_OPTIONS]) {
2020                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2021                 if (err)
2022                         goto exit_unlock_free;
2023         }
2024
2025
2026         if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2027                 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2028
2029                 err = ovs_vport_set_upcall_portids(vport, ids);
2030                 if (err)
2031                         goto exit_unlock_free;
2032         }
2033
2034         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2035                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2036         BUG_ON(err < 0);
2037
2038         ovs_unlock();
2039         ovs_notify(&dp_vport_genl_family, reply, info);
2040         return 0;
2041
2042 exit_unlock_free:
2043         ovs_unlock();
2044         kfree_skb(reply);
2045         return err;
2046 }
2047
2048 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2049 {
2050         struct nlattr **a = info->attrs;
2051         struct sk_buff *reply;
2052         struct vport *vport;
2053         int err;
2054
2055         reply = ovs_vport_cmd_alloc_info();
2056         if (!reply)
2057                 return -ENOMEM;
2058
2059         ovs_lock();
2060         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2061         err = PTR_ERR(vport);
2062         if (IS_ERR(vport))
2063                 goto exit_unlock_free;
2064
2065         if (vport->port_no == OVSP_LOCAL) {
2066                 err = -EINVAL;
2067                 goto exit_unlock_free;
2068         }
2069
2070         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2071                                       info->snd_seq, 0, OVS_VPORT_CMD_DEL);
2072         BUG_ON(err < 0);
2073         ovs_dp_detach_port(vport);
2074         ovs_unlock();
2075
2076         ovs_notify(&dp_vport_genl_family, reply, info);
2077         return 0;
2078
2079 exit_unlock_free:
2080         ovs_unlock();
2081         kfree_skb(reply);
2082         return err;
2083 }
2084
2085 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2086 {
2087         struct nlattr **a = info->attrs;
2088         struct ovs_header *ovs_header = info->userhdr;
2089         struct sk_buff *reply;
2090         struct vport *vport;
2091         int err;
2092
2093         reply = ovs_vport_cmd_alloc_info();
2094         if (!reply)
2095                 return -ENOMEM;
2096
2097         rcu_read_lock();
2098         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2099         err = PTR_ERR(vport);
2100         if (IS_ERR(vport))
2101                 goto exit_unlock_free;
2102         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2103                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2104         BUG_ON(err < 0);
2105         rcu_read_unlock();
2106
2107         return genlmsg_reply(reply, info);
2108
2109 exit_unlock_free:
2110         rcu_read_unlock();
2111         kfree_skb(reply);
2112         return err;
2113 }
2114
2115 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2116 {
2117         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2118         struct datapath *dp;
2119         int bucket = cb->args[0], skip = cb->args[1];
2120         int i, j = 0;
2121
2122         rcu_read_lock();
2123         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2124         if (!dp) {
2125                 rcu_read_unlock();
2126                 return -ENODEV;
2127         }
2128         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2129                 struct vport *vport;
2130
2131                 j = 0;
2132                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2133                         if (j >= skip &&
2134                             ovs_vport_cmd_fill_info(vport, skb,
2135                                                     NETLINK_CB(cb->skb).portid,
2136                                                     cb->nlh->nlmsg_seq,
2137                                                     NLM_F_MULTI,
2138                                                     OVS_VPORT_CMD_NEW) < 0)
2139                                 goto out;
2140
2141                         j++;
2142                 }
2143                 skip = 0;
2144         }
2145 out:
2146         rcu_read_unlock();
2147
2148         cb->args[0] = i;
2149         cb->args[1] = j;
2150
2151         return skb->len;
2152 }
2153
2154 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2155         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2156         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2157         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2158         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2159         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2160         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2161 };
2162
2163 static const struct genl_ops dp_vport_genl_ops[] = {
2164         { .cmd = OVS_VPORT_CMD_NEW,
2165           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2166           .policy = vport_policy,
2167           .doit = ovs_vport_cmd_new
2168         },
2169         { .cmd = OVS_VPORT_CMD_DEL,
2170           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2171           .policy = vport_policy,
2172           .doit = ovs_vport_cmd_del
2173         },
2174         { .cmd = OVS_VPORT_CMD_GET,
2175           .flags = 0,               /* OK for unprivileged users. */
2176           .policy = vport_policy,
2177           .doit = ovs_vport_cmd_get,
2178           .dumpit = ovs_vport_cmd_dump
2179         },
2180         { .cmd = OVS_VPORT_CMD_SET,
2181           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2182           .policy = vport_policy,
2183           .doit = ovs_vport_cmd_set,
2184         },
2185 };
2186
2187 struct genl_family dp_vport_genl_family = {
2188         .id = GENL_ID_GENERATE,
2189         .hdrsize = sizeof(struct ovs_header),
2190         .name = OVS_VPORT_FAMILY,
2191         .version = OVS_VPORT_VERSION,
2192         .maxattr = OVS_VPORT_ATTR_MAX,
2193         .netnsok = true,
2194         .parallel_ops = true,
2195         .ops = dp_vport_genl_ops,
2196         .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2197         .mcgrps = &ovs_dp_vport_multicast_group,
2198         .n_mcgrps = 1,
2199 };
2200
2201 static struct genl_family * const dp_genl_families[] = {
2202         &dp_datapath_genl_family,
2203         &dp_vport_genl_family,
2204         &dp_flow_genl_family,
2205         &dp_packet_genl_family,
2206 };
2207
2208 static void dp_unregister_genl(int n_families)
2209 {
2210         int i;
2211
2212         for (i = 0; i < n_families; i++)
2213                 genl_unregister_family(dp_genl_families[i]);
2214 }
2215
2216 static int dp_register_genl(void)
2217 {
2218         int err;
2219         int i;
2220
2221         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2222
2223                 err = genl_register_family(dp_genl_families[i]);
2224                 if (err)
2225                         goto error;
2226         }
2227
2228         return 0;
2229
2230 error:
2231         dp_unregister_genl(i);
2232         return err;
2233 }
2234
2235 static int __net_init ovs_init_net(struct net *net)
2236 {
2237         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2238
2239         INIT_LIST_HEAD(&ovs_net->dps);
2240         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2241         ovs_ct_init(net);
2242         return 0;
2243 }
2244
2245 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2246                                             struct list_head *head)
2247 {
2248         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2249         struct datapath *dp;
2250
2251         list_for_each_entry(dp, &ovs_net->dps, list_node) {
2252                 int i;
2253
2254                 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2255                         struct vport *vport;
2256
2257                         hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2258                                 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2259                                         continue;
2260
2261                                 if (dev_net(vport->dev) == dnet)
2262                                         list_add(&vport->detach_list, head);
2263                         }
2264                 }
2265         }
2266 }
2267
2268 static void __net_exit ovs_exit_net(struct net *dnet)
2269 {
2270         struct datapath *dp, *dp_next;
2271         struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2272         struct vport *vport, *vport_next;
2273         struct net *net;
2274         LIST_HEAD(head);
2275
2276         ovs_ct_exit(dnet);
2277         ovs_lock();
2278         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2279                 __dp_destroy(dp);
2280
2281         rtnl_lock();
2282         for_each_net(net)
2283                 list_vports_from_net(net, dnet, &head);
2284         rtnl_unlock();
2285
2286         /* Detach all vports from given namespace. */
2287         list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2288                 list_del(&vport->detach_list);
2289                 ovs_dp_detach_port(vport);
2290         }
2291
2292         ovs_unlock();
2293
2294         cancel_work_sync(&ovs_net->dp_notify_work);
2295 }
2296
2297 static struct pernet_operations ovs_net_ops = {
2298         .init = ovs_init_net,
2299         .exit = ovs_exit_net,
2300         .id   = &ovs_net_id,
2301         .size = sizeof(struct ovs_net),
2302 };
2303
2304 static int __init dp_init(void)
2305 {
2306         int err;
2307
2308         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2309
2310         pr_info("Open vSwitch switching datapath\n");
2311
2312         err = action_fifos_init();
2313         if (err)
2314                 goto error;
2315
2316         err = ovs_internal_dev_rtnl_link_register();
2317         if (err)
2318                 goto error_action_fifos_exit;
2319
2320         err = ovs_flow_init();
2321         if (err)
2322                 goto error_unreg_rtnl_link;
2323
2324         err = ovs_vport_init();
2325         if (err)
2326                 goto error_flow_exit;
2327
2328         err = register_pernet_device(&ovs_net_ops);
2329         if (err)
2330                 goto error_vport_exit;
2331
2332         err = register_netdevice_notifier(&ovs_dp_device_notifier);
2333         if (err)
2334                 goto error_netns_exit;
2335
2336         err = ovs_netdev_init();
2337         if (err)
2338                 goto error_unreg_notifier;
2339
2340         err = dp_register_genl();
2341         if (err < 0)
2342                 goto error_unreg_netdev;
2343
2344         return 0;
2345
2346 error_unreg_netdev:
2347         ovs_netdev_exit();
2348 error_unreg_notifier:
2349         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2350 error_netns_exit:
2351         unregister_pernet_device(&ovs_net_ops);
2352 error_vport_exit:
2353         ovs_vport_exit();
2354 error_flow_exit:
2355         ovs_flow_exit();
2356 error_unreg_rtnl_link:
2357         ovs_internal_dev_rtnl_link_unregister();
2358 error_action_fifos_exit:
2359         action_fifos_exit();
2360 error:
2361         return err;
2362 }
2363
2364 static void dp_cleanup(void)
2365 {
2366         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2367         ovs_netdev_exit();
2368         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2369         unregister_pernet_device(&ovs_net_ops);
2370         rcu_barrier();
2371         ovs_vport_exit();
2372         ovs_flow_exit();
2373         ovs_internal_dev_rtnl_link_unregister();
2374         action_fifos_exit();
2375 }
2376
2377 module_init(dp_init);
2378 module_exit(dp_cleanup);
2379
2380 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2381 MODULE_LICENSE("GPL");