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, info, 0, GFP_KERNEL);
  95 }
  96
  97 /**
  98  * DOC: Locking:
  99  *
 100  * All writes e.g. Writes to device state (add/remove datapath, port, set
 101  * operations on vports, etc.), Writes to other state (flow table
 102  * modifications, set miscellaneous datapath parameters, etc.) are protected
 103  * by ovs_lock.
 104  *
 105  * Reads are protected by RCU.
 106  *
 107  * There are a few special cases (mostly stats) that have their own
 108  * synchronization but they nest under all of above and don't interact with
 109  * each other.
 110  *
 111  * The RTNL lock nests inside ovs_mutex.
 112  */
 113
 114 static DEFINE_MUTEX(ovs_mutex);
 115
 116 void ovs_lock(void)
 117 {
 118         mutex_lock(&ovs_mutex);
 119 }
 120
 121 void ovs_unlock(void)
 122 {
 123         mutex_unlock(&ovs_mutex);
 124 }
 125
 126 #ifdef CONFIG_LOCKDEP
 127 int lockdep_ovsl_is_held(void)
 128 {
 129         if (debug_locks)
 130                 return lockdep_is_held(&ovs_mutex);
 131         else
 132                 return 1;
 133 }
 134 EXPORT_SYMBOL_GPL(lockdep_ovsl_is_held);
 135 #endif
 136
 137 static struct vport *new_vport(const struct vport_parms *);
 138 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
 139                              const struct sw_flow_key *,
 140                              const struct dp_upcall_info *,
 141                              uint32_t cutlen);
 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                                   uint32_t cutlen);
 146
 147 /* Must be called with rcu_read_lock. */
 148 static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
 149 {
 150         struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
 151
 152         if (dev) {
 153                 struct vport *vport = ovs_internal_dev_get_vport(dev);
 154                 if (vport)
 155                         return vport->dp;
 156         }
 157
 158         return NULL;
 159 }
 160
 161 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the
 162  * returned dp pointer valid.
 163  */
 164 static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
 165 {
 166         struct datapath *dp;
 167
 168         WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
 169         rcu_read_lock();
 170         dp = get_dp_rcu(net, dp_ifindex);
 171         rcu_read_unlock();
 172
 173         return dp;
 174 }
 175
 176 /* Must be called with rcu_read_lock or ovs_mutex. */
 177 const char *ovs_dp_name(const struct datapath *dp)
 178 {
 179         struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
 180         return ovs_vport_name(vport);
 181 }
 182
 183 static int get_dpifindex(const struct datapath *dp)
 184 {
 185         struct vport *local;
 186         int ifindex;
 187
 188         rcu_read_lock();
 189
 190         local = ovs_vport_rcu(dp, OVSP_LOCAL);
 191         if (local)
 192                 ifindex = local->dev->ifindex;
 193         else
 194                 ifindex = 0;
 195
 196         rcu_read_unlock();
 197
 198         return ifindex;
 199 }
 200
 201 static void destroy_dp_rcu(struct rcu_head *rcu)
 202 {
 203         struct datapath *dp = container_of(rcu, struct datapath, rcu);
 204
 205         ovs_flow_tbl_destroy(&dp->table);
 206         free_percpu(dp->stats_percpu);
 207         kfree(dp->ports);
 208         kfree(dp);
 209 }
 210
 211 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
 212                                             u16 port_no)
 213 {
 214         return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
 215 }
 216
 217 /* Called with ovs_mutex or RCU read lock. */
 218 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
 219 {
 220         struct vport *vport;
 221         struct hlist_head *head;
 222
 223         head = vport_hash_bucket(dp, port_no);
 224         hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
 225                 if (vport->port_no == port_no)
 226                         return vport;
 227         }
 228         return NULL;
 229 }
 230
 231 /* Called with ovs_mutex. */
 232 static struct vport *new_vport(const struct vport_parms *parms)
 233 {
 234         struct vport *vport;
 235
 236         vport = ovs_vport_add(parms);
 237         if (!IS_ERR(vport)) {
 238                 struct datapath *dp = parms->dp;
 239                 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
 240
 241                 hlist_add_head_rcu(&vport->dp_hash_node, head);
 242         }
 243         return vport;
 244 }
 245
 246 void ovs_dp_detach_port(struct vport *p)
 247 {
 248         ASSERT_OVSL();
 249
 250         /* First drop references to device. */
 251         hlist_del_rcu(&p->dp_hash_node);
 252
 253         /* Then destroy it. */
 254         ovs_vport_del(p);
 255 }
 256
 257 /* Must be called with rcu_read_lock. */
 258 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
 259 {
 260         const struct vport *p = OVS_CB(skb)->input_vport;
 261         struct datapath *dp = p->dp;
 262         struct sw_flow *flow;
 263         struct sw_flow_actions *sf_acts;
 264         struct dp_stats_percpu *stats;
 265         u64 *stats_counter;
 266         u32 n_mask_hit;
 267
 268         stats = this_cpu_ptr(dp->stats_percpu);
 269
 270         /* Look up flow. */
 271         flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
 272         if (unlikely(!flow)) {
 273                 struct dp_upcall_info upcall;
 274                 int error;
 275
 276                 memset(&upcall, 0, sizeof(upcall));
 277                 upcall.cmd = OVS_PACKET_CMD_MISS;
 278                 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
 279                 upcall.mru = OVS_CB(skb)->mru;
 280                 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
 281                 if (unlikely(error))
 282                         kfree_skb(skb);
 283                 else
 284                         consume_skb(skb);
 285                 stats_counter = &stats->n_missed;
 286                 goto out;
 287         }
 288
 289         ovs_flow_stats_update(flow, key->tp.flags, skb);
 290         sf_acts = rcu_dereference(flow->sf_acts);
 291         ovs_execute_actions(dp, skb, sf_acts, key);
 292
 293         stats_counter = &stats->n_hit;
 294
 295 out:
 296         /* Update datapath statistics. */
 297         u64_stats_update_begin(&stats->syncp);
 298         (*stats_counter)++;
 299         stats->n_mask_hit += n_mask_hit;
 300         u64_stats_update_end(&stats->syncp);
 301 }
 302
 303 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
 304                   const struct sw_flow_key *key,
 305                   const struct dp_upcall_info *upcall_info,
 306                   uint32_t cutlen)
 307 {
 308         struct dp_stats_percpu *stats;
 309         int err;
 310
 311         if (upcall_info->portid == 0) {
 312                 err = -ENOTCONN;
 313                 goto err;
 314         }
 315
 316         if (!skb_is_gso(skb))
 317                 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
 318         else
 319                 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
 320         if (err)
 321                 goto err;
 322
 323         return 0;
 324
 325 err:
 326         stats = this_cpu_ptr(dp->stats_percpu);
 327
 328         u64_stats_update_begin(&stats->syncp);
 329         stats->n_lost++;
 330         u64_stats_update_end(&stats->syncp);
 331
 332         return err;
 333 }
 334
 335 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
 336                              const struct sw_flow_key *key,
 337                              const struct dp_upcall_info *upcall_info,
 338                                  uint32_t cutlen)
 339 {
 340         unsigned short gso_type = skb_shinfo(skb)->gso_type;
 341         struct sw_flow_key later_key;
 342         struct sk_buff *segs, *nskb;
 343         int err;
 344
 345         BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET);
 346         segs = __skb_gso_segment(skb, NETIF_F_SG, false);
 347         if (IS_ERR(segs))
 348                 return PTR_ERR(segs);
 349         if (segs == NULL)
 350                 return -EINVAL;
 351
 352         if (gso_type & SKB_GSO_UDP) {
 353                 /* The initial flow key extracted by ovs_flow_key_extract()
 354                  * in this case is for a first fragment, so we need to
 355                  * properly mark later fragments.
 356                  */
 357                 later_key = *key;
 358                 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
 359         }
 360
 361         /* Queue all of the segments. */
 362         skb = segs;
 363         do {
 364                 if (gso_type & SKB_GSO_UDP && skb != segs)
 365                         key = &later_key;
 366
 367                 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
 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                 + nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */
 392
 393         /* OVS_PACKET_ATTR_USERDATA */
 394         if (upcall_info->userdata)
 395                 size += NLA_ALIGN(upcall_info->userdata->nla_len);
 396
 397         /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
 398         if (upcall_info->egress_tun_info)
 399                 size += nla_total_size(ovs_tun_key_attr_size());
 400
 401         /* OVS_PACKET_ATTR_ACTIONS */
 402         if (upcall_info->actions_len)
 403                 size += nla_total_size(upcall_info->actions_len);
 404
 405         /* OVS_PACKET_ATTR_MRU */
 406         if (upcall_info->mru)
 407                 size += nla_total_size(sizeof(upcall_info->mru));
 408
 409         return size;
 410 }
 411
 412 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
 413 {
 414         if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
 415                 size_t plen = NLA_ALIGN(skb->len) - skb->len;
 416
 417                 if (plen > 0)
 418                         memset(skb_put(skb, plen), 0, plen);
 419         }
 420 }
 421
 422 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
 423                                   const struct sw_flow_key *key,
 424                                   const struct dp_upcall_info *upcall_info,
 425                                   uint32_t cutlen)
 426 {
 427         struct ovs_header *upcall;
 428         struct sk_buff *nskb = NULL;
 429         struct sk_buff *user_skb = NULL; /* to be queued to userspace */
 430         struct nlattr *nla;
 431         size_t len;
 432         unsigned int hlen;
 433         int err, dp_ifindex;
 434
 435         dp_ifindex = get_dpifindex(dp);
 436         if (!dp_ifindex)
 437                 return -ENODEV;
 438
 439         if (skb_vlan_tag_present(skb)) {
 440                 nskb = skb_clone(skb, GFP_ATOMIC);
 441                 if (!nskb)
 442                         return -ENOMEM;
 443
 444                 nskb = __vlan_hwaccel_push_inside(nskb);
 445                 if (!nskb)
 446                         return -ENOMEM;
 447
 448                 skb = nskb;
 449         }
 450
 451         if (nla_attr_size(skb->len) > USHRT_MAX) {
 452                 err = -EFBIG;
 453                 goto out;
 454         }
 455
 456         /* Complete checksum if needed */
 457         if (skb->ip_summed == CHECKSUM_PARTIAL &&
 458             (err = skb_checksum_help(skb)))
 459                 goto out;
 460
 461         /* Older versions of OVS user space enforce alignment of the last
 462          * Netlink attribute to NLA_ALIGNTO which would require extensive
 463          * padding logic. Only perform zerocopy if padding is not required.
 464          */
 465         if (dp->user_features & OVS_DP_F_UNALIGNED)
 466                 hlen = skb_zerocopy_headlen(skb);
 467         else
 468                 hlen = skb->len;
 469
 470         len = upcall_msg_size(upcall_info, hlen - cutlen);
 471         user_skb = genlmsg_new(len, GFP_ATOMIC);
 472         if (!user_skb) {
 473                 err = -ENOMEM;
 474                 goto out;
 475         }
 476
 477         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
 478                              0, upcall_info->cmd);
 479         upcall->dp_ifindex = dp_ifindex;
 480
 481         err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
 482         BUG_ON(err);
 483
 484         if (upcall_info->userdata)
 485                 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
 486                           nla_len(upcall_info->userdata),
 487                           nla_data(upcall_info->userdata));
 488
 489         if (upcall_info->egress_tun_info) {
 490                 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
 491                 err = ovs_nla_put_tunnel_info(user_skb,
 492                                               upcall_info->egress_tun_info);
 493                 BUG_ON(err);
 494                 nla_nest_end(user_skb, nla);
 495         }
 496
 497         if (upcall_info->actions_len) {
 498                 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
 499                 err = ovs_nla_put_actions(upcall_info->actions,
 500                                           upcall_info->actions_len,
 501                                           user_skb);
 502                 if (!err)
 503                         nla_nest_end(user_skb, nla);
 504                 else
 505                         nla_nest_cancel(user_skb, nla);
 506         }
 507
 508         /* Add OVS_PACKET_ATTR_MRU */
 509         if (upcall_info->mru) {
 510                 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
 511                                 upcall_info->mru)) {
 512                         err = -ENOBUFS;
 513                         goto out;
 514                 }
 515                 pad_packet(dp, user_skb);
 516         }
 517
 518         /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
 519         if (cutlen > 0) {
 520                 if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN,
 521                                 skb->len)) {
 522                         err = -ENOBUFS;
 523                         goto out;
 524                 }
 525                 pad_packet(dp, user_skb);
 526         }
 527
 528         /* Only reserve room for attribute header, packet data is added
 529          * in skb_zerocopy() */
 530         if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
 531                 err = -ENOBUFS;
 532                 goto out;
 533         }
 534         nla->nla_len = nla_attr_size(skb->len - cutlen);
 535
 536         err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
 537         if (err)
 538                 goto out;
 539
 540         /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
 541         pad_packet(dp, user_skb);
 542
 543         ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
 544
 545         err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
 546         user_skb = NULL;
 547 out:
 548         if (err)
 549                 skb_tx_error(skb);
 550         kfree_skb(user_skb);
 551         kfree_skb(nskb);
 552         return err;
 553 }
 554
 555 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 556 {
 557         struct ovs_header *ovs_header = info->userhdr;
 558         struct net *net = sock_net(skb->sk);
 559         struct nlattr **a = info->attrs;
 560         struct sw_flow_actions *acts;
 561         struct sk_buff *packet;
 562         struct sw_flow *flow;
 563         struct sw_flow_actions *sf_acts;
 564         struct datapath *dp;
 565         struct ethhdr *eth;
 566         struct vport *input_vport;
 567         u16 mru = 0;
 568         int len;
 569         int err;
 570         bool log = !a[OVS_PACKET_ATTR_PROBE];
 571
 572         err = -EINVAL;
 573         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 574             !a[OVS_PACKET_ATTR_ACTIONS])
 575                 goto err;
 576
 577         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 578         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 579         err = -ENOMEM;
 580         if (!packet)
 581                 goto err;
 582         skb_reserve(packet, NET_IP_ALIGN);
 583
 584         nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
 585
 586         skb_reset_mac_header(packet);
 587         eth = eth_hdr(packet);
 588
 589         /* Normally, setting the skb 'protocol' field would be handled by a
 590          * call to eth_type_trans(), but it assumes there's a sending
 591          * device, which we may not have. */
 592         if (eth_proto_is_802_3(eth->h_proto))
 593                 packet->protocol = eth->h_proto;
 594         else
 595                 packet->protocol = htons(ETH_P_802_2);
 596
 597         /* Set packet's mru */
 598         if (a[OVS_PACKET_ATTR_MRU]) {
 599                 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
 600                 packet->ignore_df = 1;
 601         }
 602         OVS_CB(packet)->mru = mru;
 603
 604         /* Build an sw_flow for sending this packet. */
 605         flow = ovs_flow_alloc();
 606         err = PTR_ERR(flow);
 607         if (IS_ERR(flow))
 608                 goto err_kfree_skb;
 609
 610         err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
 611                                              packet, &flow->key, log);
 612         if (err)
 613                 goto err_flow_free;
 614
 615         err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
 616                                    &flow->key, &acts, log);
 617         if (err)
 618                 goto err_flow_free;
 619
 620         rcu_assign_pointer(flow->sf_acts, acts);
 621         packet->priority = flow->key.phy.priority;
 622         packet->mark = flow->key.phy.skb_mark;
 623
 624         rcu_read_lock();
 625         dp = get_dp_rcu(net, ovs_header->dp_ifindex);
 626         err = -ENODEV;
 627         if (!dp)
 628                 goto err_unlock;
 629
 630         input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
 631         if (!input_vport)
 632                 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
 633
 634         if (!input_vport)
 635                 goto err_unlock;
 636
 637         packet->dev = input_vport->dev;
 638         OVS_CB(packet)->input_vport = input_vport;
 639         sf_acts = rcu_dereference(flow->sf_acts);
 640
 641         local_bh_disable();
 642         err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
 643         local_bh_enable();
 644         rcu_read_unlock();
 645
 646         ovs_flow_free(flow, false);
 647         return err;
 648
 649 err_unlock:
 650         rcu_read_unlock();
 651 err_flow_free:
 652         ovs_flow_free(flow, false);
 653 err_kfree_skb:
 654         kfree_skb(packet);
 655 err:
 656         return err;
 657 }
 658
 659 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 660         [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
 661         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 662         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 663         [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
 664         [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
 665 };
 666
 667 static const struct genl_ops dp_packet_genl_ops[] = {
 668         { .cmd = OVS_PACKET_CMD_EXECUTE,
 669           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 670           .policy = packet_policy,
 671           .doit = ovs_packet_cmd_execute
 672         }
 673 };
 674
 675 static struct genl_family dp_packet_genl_family = {
 676         .id = GENL_ID_GENERATE,
 677         .hdrsize = sizeof(struct ovs_header),
 678         .name = OVS_PACKET_FAMILY,
 679         .version = OVS_PACKET_VERSION,
 680         .maxattr = OVS_PACKET_ATTR_MAX,
 681         .netnsok = true,
 682         .parallel_ops = true,
 683         .ops = dp_packet_genl_ops,
 684         .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
 685 };
 686
 687 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
 688                          struct ovs_dp_megaflow_stats *mega_stats)
 689 {
 690         int i;
 691
 692         memset(mega_stats, 0, sizeof(*mega_stats));
 693
 694         stats->n_flows = ovs_flow_tbl_count(&dp->table);
 695         mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
 696
 697         stats->n_hit = stats->n_missed = stats->n_lost = 0;
 698
 699         for_each_possible_cpu(i) {
 700                 const struct dp_stats_percpu *percpu_stats;
 701                 struct dp_stats_percpu local_stats;
 702                 unsigned int start;
 703
 704                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 705
 706                 do {
 707                         start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
 708                         local_stats = *percpu_stats;
 709                 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
 710
 711                 stats->n_hit += local_stats.n_hit;
 712                 stats->n_missed += local_stats.n_missed;
 713                 stats->n_lost += local_stats.n_lost;
 714                 mega_stats->n_mask_hit += local_stats.n_mask_hit;
 715         }
 716 }
 717
 718 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
 719 {
 720         return ovs_identifier_is_ufid(sfid) &&
 721                !(ufid_flags & OVS_UFID_F_OMIT_KEY);
 722 }
 723
 724 static bool should_fill_mask(uint32_t ufid_flags)
 725 {
 726         return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
 727 }
 728
 729 static bool should_fill_actions(uint32_t ufid_flags)
 730 {
 731         return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
 732 }
 733
 734 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
 735                                     const struct sw_flow_id *sfid,
 736                                     uint32_t ufid_flags)
 737 {
 738         size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
 739
 740         /* OVS_FLOW_ATTR_UFID */
 741         if (sfid && ovs_identifier_is_ufid(sfid))
 742                 len += nla_total_size(sfid->ufid_len);
 743
 744         /* OVS_FLOW_ATTR_KEY */
 745         if (!sfid || should_fill_key(sfid, ufid_flags))
 746                 len += nla_total_size(ovs_key_attr_size());
 747
 748         /* OVS_FLOW_ATTR_MASK */
 749         if (should_fill_mask(ufid_flags))
 750                 len += nla_total_size(ovs_key_attr_size());
 751
 752         /* OVS_FLOW_ATTR_ACTIONS */
 753         if (should_fill_actions(ufid_flags))
 754                 len += nla_total_size(acts->orig_len);
 755
 756         return len
 757                 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
 758                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
 759                 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
 760 }
 761
 762 /* Called with ovs_mutex or RCU read lock. */
 763 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
 764                                    struct sk_buff *skb)
 765 {
 766         struct ovs_flow_stats stats;
 767         __be16 tcp_flags;
 768         unsigned long used;
 769
 770         ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
 771
 772         if (used &&
 773             nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
 774                               OVS_FLOW_ATTR_PAD))
 775                 return -EMSGSIZE;
 776
 777         if (stats.n_packets &&
 778             nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
 779                           sizeof(struct ovs_flow_stats), &stats,
 780                           OVS_FLOW_ATTR_PAD))
 781                 return -EMSGSIZE;
 782
 783         if ((u8)ntohs(tcp_flags) &&
 784              nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
 785                 return -EMSGSIZE;
 786
 787         return 0;
 788 }
 789
 790 /* Called with ovs_mutex or RCU read lock. */
 791 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
 792                                      struct sk_buff *skb, int skb_orig_len)
 793 {
 794         struct nlattr *start;
 795         int err;
 796
 797         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 798          * this is the first flow to be dumped into 'skb'.  This is unusual for
 799          * Netlink but individual action lists can be longer than
 800          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 801          * The userspace caller can always fetch the actions separately if it
 802          * really wants them.  (Most userspace callers in fact don't care.)
 803          *
 804          * This can only fail for dump operations because the skb is always
 805          * properly sized for single flows.
 806          */
 807         start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
 808         if (start) {
 809                 const struct sw_flow_actions *sf_acts;
 810
 811                 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
 812                 err = ovs_nla_put_actions(sf_acts->actions,
 813                                           sf_acts->actions_len, skb);
 814
 815                 if (!err)
 816                         nla_nest_end(skb, start);
 817                 else {
 818                         if (skb_orig_len)
 819                                 return err;
 820
 821                         nla_nest_cancel(skb, start);
 822                 }
 823         } else if (skb_orig_len) {
 824                 return -EMSGSIZE;
 825         }
 826
 827         return 0;
 828 }
 829
 830 /* Called with ovs_mutex or RCU read lock. */
 831 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
 832                                   struct sk_buff *skb, u32 portid,
 833                                   u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
 834 {
 835         const int skb_orig_len = skb->len;
 836         struct ovs_header *ovs_header;
 837         int err;
 838
 839         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
 840                                  flags, cmd);
 841         if (!ovs_header)
 842                 return -EMSGSIZE;
 843
 844         ovs_header->dp_ifindex = dp_ifindex;
 845
 846         err = ovs_nla_put_identifier(flow, skb);
 847         if (err)
 848                 goto error;
 849
 850         if (should_fill_key(&flow->id, ufid_flags)) {
 851                 err = ovs_nla_put_masked_key(flow, skb);
 852                 if (err)
 853                         goto error;
 854         }
 855
 856         if (should_fill_mask(ufid_flags)) {
 857                 err = ovs_nla_put_mask(flow, skb);
 858                 if (err)
 859                         goto error;
 860         }
 861
 862         err = ovs_flow_cmd_fill_stats(flow, skb);
 863         if (err)
 864                 goto error;
 865
 866         if (should_fill_actions(ufid_flags)) {
 867                 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
 868                 if (err)
 869                         goto error;
 870         }
 871
 872         genlmsg_end(skb, ovs_header);
 873         return 0;
 874
 875 error:
 876         genlmsg_cancel(skb, ovs_header);
 877         return err;
 878 }
 879
 880 /* May not be called with RCU read lock. */
 881 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
 882                                                const struct sw_flow_id *sfid,
 883                                                struct genl_info *info,
 884                                                bool always,
 885                                                uint32_t ufid_flags)
 886 {
 887         struct sk_buff *skb;
 888         size_t len;
 889
 890         if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
 891                 return NULL;
 892
 893         len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
 894         skb = genlmsg_new(len, GFP_KERNEL);
 895         if (!skb)
 896                 return ERR_PTR(-ENOMEM);
 897
 898         return skb;
 899 }
 900
 901 /* Called with ovs_mutex. */
 902 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
 903                                                int dp_ifindex,
 904                                                struct genl_info *info, u8 cmd,
 905                                                bool always, u32 ufid_flags)
 906 {
 907         struct sk_buff *skb;
 908         int retval;
 909
 910         skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
 911                                       &flow->id, info, always, ufid_flags);
 912         if (IS_ERR_OR_NULL(skb))
 913                 return skb;
 914
 915         retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
 916                                         info->snd_portid, info->snd_seq, 0,
 917                                         cmd, ufid_flags);
 918         BUG_ON(retval < 0);
 919         return skb;
 920 }
 921
 922 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
 923 {
 924         struct net *net = sock_net(skb->sk);
 925         struct nlattr **a = info->attrs;
 926         struct ovs_header *ovs_header = info->userhdr;
 927         struct sw_flow *flow = NULL, *new_flow;
 928         struct sw_flow_mask mask;
 929         struct sk_buff *reply;
 930         struct datapath *dp;
 931         struct sw_flow_key key;
 932         struct sw_flow_actions *acts;
 933         struct sw_flow_match match;
 934         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
 935         int error;
 936         bool log = !a[OVS_FLOW_ATTR_PROBE];
 937
 938         /* Must have key and actions. */
 939         error = -EINVAL;
 940         if (!a[OVS_FLOW_ATTR_KEY]) {
 941                 OVS_NLERR(log, "Flow key attr not present in new flow.");
 942                 goto error;
 943         }
 944         if (!a[OVS_FLOW_ATTR_ACTIONS]) {
 945                 OVS_NLERR(log, "Flow actions attr not present in new flow.");
 946                 goto error;
 947         }
 948
 949         /* Most of the time we need to allocate a new flow, do it before
 950          * locking.
 951          */
 952         new_flow = ovs_flow_alloc();
 953         if (IS_ERR(new_flow)) {
 954                 error = PTR_ERR(new_flow);
 955                 goto error;
 956         }
 957
 958         /* Extract key. */
 959         ovs_match_init(&match, &key, &mask);
 960         error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
 961                                   a[OVS_FLOW_ATTR_MASK], log);
 962         if (error)
 963                 goto err_kfree_flow;
 964
 965         ovs_flow_mask_key(&new_flow->key, &key, true, &mask);
 966
 967         /* Extract flow identifier. */
 968         error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
 969                                        &key, log);
 970         if (error)
 971                 goto err_kfree_flow;
 972
 973         /* Validate actions. */
 974         error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
 975                                      &new_flow->key, &acts, log);
 976         if (error) {
 977                 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
 978                 goto err_kfree_flow;
 979         }
 980
 981         reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
 982                                         ufid_flags);
 983         if (IS_ERR(reply)) {
 984                 error = PTR_ERR(reply);
 985                 goto err_kfree_acts;
 986         }
 987
 988         ovs_lock();
 989         dp = get_dp(net, ovs_header->dp_ifindex);
 990         if (unlikely(!dp)) {
 991                 error = -ENODEV;
 992                 goto err_unlock_ovs;
 993         }
 994
 995         /* Check if this is a duplicate flow */
 996         if (ovs_identifier_is_ufid(&new_flow->id))
 997                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
 998         if (!flow)
 999                 flow = ovs_flow_tbl_lookup(&dp->table, &key);
1000         if (likely(!flow)) {
1001                 rcu_assign_pointer(new_flow->sf_acts, acts);
1002
1003                 /* Put flow in bucket. */
1004                 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
1005                 if (unlikely(error)) {
1006                         acts = NULL;
1007                         goto err_unlock_ovs;
1008                 }
1009
1010                 if (unlikely(reply)) {
1011                         error = ovs_flow_cmd_fill_info(new_flow,
1012                                                        ovs_header->dp_ifindex,
1013                                                        reply, info->snd_portid,
1014                                                        info->snd_seq, 0,
1015                                                        OVS_FLOW_CMD_NEW,
1016                                                        ufid_flags);
1017                         BUG_ON(error < 0);
1018                 }
1019                 ovs_unlock();
1020         } else {
1021                 struct sw_flow_actions *old_acts;
1022
1023                 /* Bail out if we're not allowed to modify an existing flow.
1024                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1025                  * because Generic Netlink treats the latter as a dump
1026                  * request.  We also accept NLM_F_EXCL in case that bug ever
1027                  * gets fixed.
1028                  */
1029                 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1030                                                          | NLM_F_EXCL))) {
1031                         error = -EEXIST;
1032                         goto err_unlock_ovs;
1033                 }
1034                 /* The flow identifier has to be the same for flow updates.
1035                  * Look for any overlapping flow.
1036                  */
1037                 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1038                         if (ovs_identifier_is_key(&flow->id))
1039                                 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1040                                                                  &match);
1041                         else /* UFID matches but key is different */
1042                                 flow = NULL;
1043                         if (!flow) {
1044                                 error = -ENOENT;
1045                                 goto err_unlock_ovs;
1046                         }
1047                 }
1048                 /* Update actions. */
1049                 old_acts = ovsl_dereference(flow->sf_acts);
1050                 rcu_assign_pointer(flow->sf_acts, acts);
1051
1052                 if (unlikely(reply)) {
1053                         error = ovs_flow_cmd_fill_info(flow,
1054                                                        ovs_header->dp_ifindex,
1055                                                        reply, info->snd_portid,
1056                                                        info->snd_seq, 0,
1057                                                        OVS_FLOW_CMD_NEW,
1058                                                        ufid_flags);
1059                         BUG_ON(error < 0);
1060                 }
1061                 ovs_unlock();
1062
1063                 ovs_nla_free_flow_actions_rcu(old_acts);
1064                 ovs_flow_free(new_flow, false);
1065         }
1066
1067         if (reply)
1068                 ovs_notify(&dp_flow_genl_family, reply, info);
1069         return 0;
1070
1071 err_unlock_ovs:
1072         ovs_unlock();
1073         kfree_skb(reply);
1074 err_kfree_acts:
1075         ovs_nla_free_flow_actions(acts);
1076 err_kfree_flow:
1077         ovs_flow_free(new_flow, false);
1078 error:
1079         return error;
1080 }
1081
1082 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1083 static struct sw_flow_actions *get_flow_actions(struct net *net,
1084                                                 const struct nlattr *a,
1085                                                 const struct sw_flow_key *key,
1086                                                 const struct sw_flow_mask *mask,
1087                                                 bool log)
1088 {
1089         struct sw_flow_actions *acts;
1090         struct sw_flow_key masked_key;
1091         int error;
1092
1093         ovs_flow_mask_key(&masked_key, key, true, mask);
1094         error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1095         if (error) {
1096                 OVS_NLERR(log,
1097                           "Actions may not be safe on all matching packets");
1098                 return ERR_PTR(error);
1099         }
1100
1101         return acts;
1102 }
1103
1104 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1105 {
1106         struct net *net = sock_net(skb->sk);
1107         struct nlattr **a = info->attrs;
1108         struct ovs_header *ovs_header = info->userhdr;
1109         struct sw_flow_key key;
1110         struct sw_flow *flow;
1111         struct sw_flow_mask mask;
1112         struct sk_buff *reply = NULL;
1113         struct datapath *dp;
1114         struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1115         struct sw_flow_match match;
1116         struct sw_flow_id sfid;
1117         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1118         int error = 0;
1119         bool log = !a[OVS_FLOW_ATTR_PROBE];
1120         bool ufid_present;
1121
1122         ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1123         if (a[OVS_FLOW_ATTR_KEY]) {
1124                 ovs_match_init(&match, &key, &mask);
1125                 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1126                                           a[OVS_FLOW_ATTR_MASK], log);
1127         } else if (!ufid_present) {
1128                 OVS_NLERR(log,
1129                           "Flow set message rejected, Key attribute missing.");
1130                 error = -EINVAL;
1131         }
1132         if (error)
1133                 goto error;
1134
1135         /* Validate actions. */
1136         if (a[OVS_FLOW_ATTR_ACTIONS]) {
1137                 if (!a[OVS_FLOW_ATTR_KEY]) {
1138                         OVS_NLERR(log,
1139                                   "Flow key attribute not present in set flow.");
1140                         error = -EINVAL;
1141                         goto error;
1142                 }
1143
1144                 acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key,
1145                                         &mask, log);
1146                 if (IS_ERR(acts)) {
1147                         error = PTR_ERR(acts);
1148                         goto error;
1149                 }
1150
1151                 /* Can allocate before locking if have acts. */
1152                 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1153                                                 ufid_flags);
1154                 if (IS_ERR(reply)) {
1155                         error = PTR_ERR(reply);
1156                         goto err_kfree_acts;
1157                 }
1158         }
1159
1160         ovs_lock();
1161         dp = get_dp(net, ovs_header->dp_ifindex);
1162         if (unlikely(!dp)) {
1163                 error = -ENODEV;
1164                 goto err_unlock_ovs;
1165         }
1166         /* Check that the flow exists. */
1167         if (ufid_present)
1168                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1169         else
1170                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1171         if (unlikely(!flow)) {
1172                 error = -ENOENT;
1173                 goto err_unlock_ovs;
1174         }
1175
1176         /* Update actions, if present. */
1177         if (likely(acts)) {
1178                 old_acts = ovsl_dereference(flow->sf_acts);
1179                 rcu_assign_pointer(flow->sf_acts, acts);
1180
1181                 if (unlikely(reply)) {
1182                         error = ovs_flow_cmd_fill_info(flow,
1183                                                        ovs_header->dp_ifindex,
1184                                                        reply, info->snd_portid,
1185                                                        info->snd_seq, 0,
1186                                                        OVS_FLOW_CMD_NEW,
1187                                                        ufid_flags);
1188                         BUG_ON(error < 0);
1189                 }
1190         } else {
1191                 /* Could not alloc without acts before locking. */
1192                 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1193                                                 info, OVS_FLOW_CMD_NEW, false,
1194                                                 ufid_flags);
1195
1196                 if (IS_ERR(reply)) {
1197                         error = PTR_ERR(reply);
1198                         goto err_unlock_ovs;
1199                 }
1200         }
1201
1202         /* Clear stats. */
1203         if (a[OVS_FLOW_ATTR_CLEAR])
1204                 ovs_flow_stats_clear(flow);
1205         ovs_unlock();
1206
1207         if (reply)
1208                 ovs_notify(&dp_flow_genl_family, reply, info);
1209         if (old_acts)
1210                 ovs_nla_free_flow_actions_rcu(old_acts);
1211
1212         return 0;
1213
1214 err_unlock_ovs:
1215         ovs_unlock();
1216         kfree_skb(reply);
1217 err_kfree_acts:
1218         ovs_nla_free_flow_actions(acts);
1219 error:
1220         return error;
1221 }
1222
1223 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1224 {
1225         struct nlattr **a = info->attrs;
1226         struct ovs_header *ovs_header = info->userhdr;
1227         struct net *net = sock_net(skb->sk);
1228         struct sw_flow_key key;
1229         struct sk_buff *reply;
1230         struct sw_flow *flow;
1231         struct datapath *dp;
1232         struct sw_flow_match match;
1233         struct sw_flow_id ufid;
1234         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1235         int err = 0;
1236         bool log = !a[OVS_FLOW_ATTR_PROBE];
1237         bool ufid_present;
1238
1239         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1240         if (a[OVS_FLOW_ATTR_KEY]) {
1241                 ovs_match_init(&match, &key, NULL);
1242                 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1243                                         log);
1244         } else if (!ufid_present) {
1245                 OVS_NLERR(log,
1246                           "Flow get message rejected, Key attribute missing.");
1247                 err = -EINVAL;
1248         }
1249         if (err)
1250                 return err;
1251
1252         ovs_lock();
1253         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1254         if (!dp) {
1255                 err = -ENODEV;
1256                 goto unlock;
1257         }
1258
1259         if (ufid_present)
1260                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1261         else
1262                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1263         if (!flow) {
1264                 err = -ENOENT;
1265                 goto unlock;
1266         }
1267
1268         reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1269                                         OVS_FLOW_CMD_NEW, true, ufid_flags);
1270         if (IS_ERR(reply)) {
1271                 err = PTR_ERR(reply);
1272                 goto unlock;
1273         }
1274
1275         ovs_unlock();
1276         return genlmsg_reply(reply, info);
1277 unlock:
1278         ovs_unlock();
1279         return err;
1280 }
1281
1282 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1283 {
1284         struct nlattr **a = info->attrs;
1285         struct ovs_header *ovs_header = info->userhdr;
1286         struct net *net = sock_net(skb->sk);
1287         struct sw_flow_key key;
1288         struct sk_buff *reply;
1289         struct sw_flow *flow = NULL;
1290         struct datapath *dp;
1291         struct sw_flow_match match;
1292         struct sw_flow_id ufid;
1293         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1294         int err;
1295         bool log = !a[OVS_FLOW_ATTR_PROBE];
1296         bool ufid_present;
1297
1298         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1299         if (a[OVS_FLOW_ATTR_KEY]) {
1300                 ovs_match_init(&match, &key, NULL);
1301                 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1302                                         NULL, log);
1303                 if (unlikely(err))
1304                         return err;
1305         }
1306
1307         ovs_lock();
1308         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1309         if (unlikely(!dp)) {
1310                 err = -ENODEV;
1311                 goto unlock;
1312         }
1313
1314         if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1315                 err = ovs_flow_tbl_flush(&dp->table);
1316                 goto unlock;
1317         }
1318
1319         if (ufid_present)
1320                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1321         else
1322                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1323         if (unlikely(!flow)) {
1324                 err = -ENOENT;
1325                 goto unlock;
1326         }
1327
1328         ovs_flow_tbl_remove(&dp->table, flow);
1329         ovs_unlock();
1330
1331         reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1332                                         &flow->id, info, false, ufid_flags);
1333         if (likely(reply)) {
1334                 if (likely(!IS_ERR(reply))) {
1335                         rcu_read_lock();        /*To keep RCU checker happy. */
1336                         err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1337                                                      reply, info->snd_portid,
1338                                                      info->snd_seq, 0,
1339                                                      OVS_FLOW_CMD_DEL,
1340                                                      ufid_flags);
1341                         rcu_read_unlock();
1342                         BUG_ON(err < 0);
1343
1344                         ovs_notify(&dp_flow_genl_family, reply, info);
1345                 } else {
1346                         netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1347                 }
1348         }
1349
1350         ovs_flow_free(flow, true);
1351         return 0;
1352 unlock:
1353         ovs_unlock();
1354         return err;
1355 }
1356
1357 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1358 {
1359         struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1360         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1361         struct table_instance *ti;
1362         struct datapath *dp;
1363         u32 ufid_flags;
1364         int err;
1365
1366         err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1367                             OVS_FLOW_ATTR_MAX, flow_policy);
1368         if (err)
1369                 return err;
1370         ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1371
1372         rcu_read_lock();
1373         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1374         if (!dp) {
1375                 rcu_read_unlock();
1376                 return -ENODEV;
1377         }
1378
1379         ti = rcu_dereference(dp->table.ti);
1380         for (;;) {
1381                 struct sw_flow *flow;
1382                 u32 bucket, obj;
1383
1384                 bucket = cb->args[0];
1385                 obj = cb->args[1];
1386                 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1387                 if (!flow)
1388                         break;
1389
1390                 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1391                                            NETLINK_CB(cb->skb).portid,
1392                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1393                                            OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1394                         break;
1395
1396                 cb->args[0] = bucket;
1397                 cb->args[1] = obj;
1398         }
1399         rcu_read_unlock();
1400         return skb->len;
1401 }
1402
1403 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1404         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1405         [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1406         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1407         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1408         [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1409         [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1410         [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1411 };
1412
1413 static const struct genl_ops dp_flow_genl_ops[] = {
1414         { .cmd = OVS_FLOW_CMD_NEW,
1415           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1416           .policy = flow_policy,
1417           .doit = ovs_flow_cmd_new
1418         },
1419         { .cmd = OVS_FLOW_CMD_DEL,
1420           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1421           .policy = flow_policy,
1422           .doit = ovs_flow_cmd_del
1423         },
1424         { .cmd = OVS_FLOW_CMD_GET,
1425           .flags = 0,               /* OK for unprivileged users. */
1426           .policy = flow_policy,
1427           .doit = ovs_flow_cmd_get,
1428           .dumpit = ovs_flow_cmd_dump
1429         },
1430         { .cmd = OVS_FLOW_CMD_SET,
1431           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1432           .policy = flow_policy,
1433           .doit = ovs_flow_cmd_set,
1434         },
1435 };
1436
1437 static struct genl_family dp_flow_genl_family = {
1438         .id = GENL_ID_GENERATE,
1439         .hdrsize = sizeof(struct ovs_header),
1440         .name = OVS_FLOW_FAMILY,
1441         .version = OVS_FLOW_VERSION,
1442         .maxattr = OVS_FLOW_ATTR_MAX,
1443         .netnsok = true,
1444         .parallel_ops = true,
1445         .ops = dp_flow_genl_ops,
1446         .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1447         .mcgrps = &ovs_dp_flow_multicast_group,
1448         .n_mcgrps = 1,
1449 };
1450
1451 static size_t ovs_dp_cmd_msg_size(void)
1452 {
1453         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1454
1455         msgsize += nla_total_size(IFNAMSIZ);
1456         msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1457         msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1458         msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1459
1460         return msgsize;
1461 }
1462
1463 /* Called with ovs_mutex. */
1464 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1465                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1466 {
1467         struct ovs_header *ovs_header;
1468         struct ovs_dp_stats dp_stats;
1469         struct ovs_dp_megaflow_stats dp_megaflow_stats;
1470         int err;
1471
1472         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1473                                    flags, cmd);
1474         if (!ovs_header)
1475                 goto error;
1476
1477         ovs_header->dp_ifindex = get_dpifindex(dp);
1478
1479         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1480         if (err)
1481                 goto nla_put_failure;
1482
1483         get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1484         if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1485                           &dp_stats, OVS_DP_ATTR_PAD))
1486                 goto nla_put_failure;
1487
1488         if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1489                           sizeof(struct ovs_dp_megaflow_stats),
1490                           &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1491                 goto nla_put_failure;
1492
1493         if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1494                 goto nla_put_failure;
1495
1496         genlmsg_end(skb, ovs_header);
1497         return 0;
1498
1499 nla_put_failure:
1500         genlmsg_cancel(skb, ovs_header);
1501 error:
1502         return -EMSGSIZE;
1503 }
1504
1505 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1506 {
1507         return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1508 }
1509
1510 /* Called with rcu_read_lock or ovs_mutex. */
1511 static struct datapath *lookup_datapath(struct net *net,
1512                                         const struct ovs_header *ovs_header,
1513                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1514 {
1515         struct datapath *dp;
1516
1517         if (!a[OVS_DP_ATTR_NAME])
1518                 dp = get_dp(net, ovs_header->dp_ifindex);
1519         else {
1520                 struct vport *vport;
1521
1522                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1523                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1524         }
1525         return dp ? dp : ERR_PTR(-ENODEV);
1526 }
1527
1528 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1529 {
1530         struct datapath *dp;
1531
1532         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1533         if (IS_ERR(dp))
1534                 return;
1535
1536         WARN(dp->user_features, "Dropping previously announced user features\n");
1537         dp->user_features = 0;
1538 }
1539
1540 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1541 {
1542         if (a[OVS_DP_ATTR_USER_FEATURES])
1543                 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1544 }
1545
1546 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1547 {
1548         struct nlattr **a = info->attrs;
1549         struct vport_parms parms;
1550         struct sk_buff *reply;
1551         struct datapath *dp;
1552         struct vport *vport;
1553         struct ovs_net *ovs_net;
1554         int err, i;
1555
1556         err = -EINVAL;
1557         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1558                 goto err;
1559
1560         reply = ovs_dp_cmd_alloc_info();
1561         if (!reply)
1562                 return -ENOMEM;
1563
1564         err = -ENOMEM;
1565         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1566         if (dp == NULL)
1567                 goto err_free_reply;
1568
1569         ovs_dp_set_net(dp, sock_net(skb->sk));
1570
1571         /* Allocate table. */
1572         err = ovs_flow_tbl_init(&dp->table);
1573         if (err)
1574                 goto err_free_dp;
1575
1576         dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1577         if (!dp->stats_percpu) {
1578                 err = -ENOMEM;
1579                 goto err_destroy_table;
1580         }
1581
1582         dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1583                             GFP_KERNEL);
1584         if (!dp->ports) {
1585                 err = -ENOMEM;
1586                 goto err_destroy_percpu;
1587         }
1588
1589         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1590                 INIT_HLIST_HEAD(&dp->ports[i]);
1591
1592         /* Set up our datapath device. */
1593         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1594         parms.type = OVS_VPORT_TYPE_INTERNAL;
1595         parms.options = NULL;
1596         parms.dp = dp;
1597         parms.port_no = OVSP_LOCAL;
1598         parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1599
1600         ovs_dp_change(dp, a);
1601
1602         /* So far only local changes have been made, now need the lock. */
1603         ovs_lock();
1604
1605         vport = new_vport(&parms);
1606         if (IS_ERR(vport)) {
1607                 err = PTR_ERR(vport);
1608                 if (err == -EBUSY)
1609                         err = -EEXIST;
1610
1611                 if (err == -EEXIST) {
1612                         /* An outdated user space instance that does not understand
1613                          * the concept of user_features has attempted to create a new
1614                          * datapath and is likely to reuse it. Drop all user features.
1615                          */
1616                         if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1617                                 ovs_dp_reset_user_features(skb, info);
1618                 }
1619
1620                 goto err_destroy_ports_array;
1621         }
1622
1623         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1624                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1625         BUG_ON(err < 0);
1626
1627         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1628         list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1629
1630         ovs_unlock();
1631
1632         ovs_notify(&dp_datapath_genl_family, reply, info);
1633         return 0;
1634
1635 err_destroy_ports_array:
1636         ovs_unlock();
1637         kfree(dp->ports);
1638 err_destroy_percpu:
1639         free_percpu(dp->stats_percpu);
1640 err_destroy_table:
1641         ovs_flow_tbl_destroy(&dp->table);
1642 err_free_dp:
1643         kfree(dp);
1644 err_free_reply:
1645         kfree_skb(reply);
1646 err:
1647         return err;
1648 }
1649
1650 /* Called with ovs_mutex. */
1651 static void __dp_destroy(struct datapath *dp)
1652 {
1653         int i;
1654
1655         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1656                 struct vport *vport;
1657                 struct hlist_node *n;
1658
1659                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1660                         if (vport->port_no != OVSP_LOCAL)
1661                                 ovs_dp_detach_port(vport);
1662         }
1663
1664         list_del_rcu(&dp->list_node);
1665
1666         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1667          * all ports in datapath are destroyed first before freeing datapath.
1668          */
1669         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1670
1671         /* RCU destroy the flow table */
1672         call_rcu(&dp->rcu, destroy_dp_rcu);
1673 }
1674
1675 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1676 {
1677         struct sk_buff *reply;
1678         struct datapath *dp;
1679         int err;
1680
1681         reply = ovs_dp_cmd_alloc_info();
1682         if (!reply)
1683                 return -ENOMEM;
1684
1685         ovs_lock();
1686         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1687         err = PTR_ERR(dp);
1688         if (IS_ERR(dp))
1689                 goto err_unlock_free;
1690
1691         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1692                                    info->snd_seq, 0, OVS_DP_CMD_DEL);
1693         BUG_ON(err < 0);
1694
1695         __dp_destroy(dp);
1696         ovs_unlock();
1697
1698         ovs_notify(&dp_datapath_genl_family, reply, info);
1699
1700         return 0;
1701
1702 err_unlock_free:
1703         ovs_unlock();
1704         kfree_skb(reply);
1705         return err;
1706 }
1707
1708 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1709 {
1710         struct sk_buff *reply;
1711         struct datapath *dp;
1712         int err;
1713
1714         reply = ovs_dp_cmd_alloc_info();
1715         if (!reply)
1716                 return -ENOMEM;
1717
1718         ovs_lock();
1719         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1720         err = PTR_ERR(dp);
1721         if (IS_ERR(dp))
1722                 goto err_unlock_free;
1723
1724         ovs_dp_change(dp, info->attrs);
1725
1726         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1727                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1728         BUG_ON(err < 0);
1729
1730         ovs_unlock();
1731         ovs_notify(&dp_datapath_genl_family, reply, info);
1732
1733         return 0;
1734
1735 err_unlock_free:
1736         ovs_unlock();
1737         kfree_skb(reply);
1738         return err;
1739 }
1740
1741 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1742 {
1743         struct sk_buff *reply;
1744         struct datapath *dp;
1745         int err;
1746
1747         reply = ovs_dp_cmd_alloc_info();
1748         if (!reply)
1749                 return -ENOMEM;
1750
1751         ovs_lock();
1752         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1753         if (IS_ERR(dp)) {
1754                 err = PTR_ERR(dp);
1755                 goto err_unlock_free;
1756         }
1757         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1758                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1759         BUG_ON(err < 0);
1760         ovs_unlock();
1761
1762         return genlmsg_reply(reply, info);
1763
1764 err_unlock_free:
1765         ovs_unlock();
1766         kfree_skb(reply);
1767         return err;
1768 }
1769
1770 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1771 {
1772         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1773         struct datapath *dp;
1774         int skip = cb->args[0];
1775         int i = 0;
1776
1777         ovs_lock();
1778         list_for_each_entry(dp, &ovs_net->dps, list_node) {
1779                 if (i >= skip &&
1780                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1781                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1782                                          OVS_DP_CMD_NEW) < 0)
1783                         break;
1784                 i++;
1785         }
1786         ovs_unlock();
1787
1788         cb->args[0] = i;
1789
1790         return skb->len;
1791 }
1792
1793 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1794         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1795         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1796         [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1797 };
1798
1799 static const struct genl_ops dp_datapath_genl_ops[] = {
1800         { .cmd = OVS_DP_CMD_NEW,
1801           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1802           .policy = datapath_policy,
1803           .doit = ovs_dp_cmd_new
1804         },
1805         { .cmd = OVS_DP_CMD_DEL,
1806           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1807           .policy = datapath_policy,
1808           .doit = ovs_dp_cmd_del
1809         },
1810         { .cmd = OVS_DP_CMD_GET,
1811           .flags = 0,               /* OK for unprivileged users. */
1812           .policy = datapath_policy,
1813           .doit = ovs_dp_cmd_get,
1814           .dumpit = ovs_dp_cmd_dump
1815         },
1816         { .cmd = OVS_DP_CMD_SET,
1817           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1818           .policy = datapath_policy,
1819           .doit = ovs_dp_cmd_set,
1820         },
1821 };
1822
1823 static struct genl_family dp_datapath_genl_family = {
1824         .id = GENL_ID_GENERATE,
1825         .hdrsize = sizeof(struct ovs_header),
1826         .name = OVS_DATAPATH_FAMILY,
1827         .version = OVS_DATAPATH_VERSION,
1828         .maxattr = OVS_DP_ATTR_MAX,
1829         .netnsok = true,
1830         .parallel_ops = true,
1831         .ops = dp_datapath_genl_ops,
1832         .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1833         .mcgrps = &ovs_dp_datapath_multicast_group,
1834         .n_mcgrps = 1,
1835 };
1836
1837 /* Called with ovs_mutex or RCU read lock. */
1838 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1839                                    u32 portid, u32 seq, u32 flags, u8 cmd)
1840 {
1841         struct ovs_header *ovs_header;
1842         struct ovs_vport_stats vport_stats;
1843         int err;
1844
1845         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1846                                  flags, cmd);
1847         if (!ovs_header)
1848                 return -EMSGSIZE;
1849
1850         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1851
1852         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1853             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1854             nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1855                            ovs_vport_name(vport)))
1856                 goto nla_put_failure;
1857
1858         ovs_vport_get_stats(vport, &vport_stats);
1859         if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
1860                           sizeof(struct ovs_vport_stats), &vport_stats,
1861                           OVS_VPORT_ATTR_PAD))
1862                 goto nla_put_failure;
1863
1864         if (ovs_vport_get_upcall_portids(vport, skb))
1865                 goto nla_put_failure;
1866
1867         err = ovs_vport_get_options(vport, skb);
1868         if (err == -EMSGSIZE)
1869                 goto error;
1870
1871         genlmsg_end(skb, ovs_header);
1872         return 0;
1873
1874 nla_put_failure:
1875         err = -EMSGSIZE;
1876 error:
1877         genlmsg_cancel(skb, ovs_header);
1878         return err;
1879 }
1880
1881 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1882 {
1883         return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1884 }
1885
1886 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1887 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1888                                          u32 seq, u8 cmd)
1889 {
1890         struct sk_buff *skb;
1891         int retval;
1892
1893         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1894         if (!skb)
1895                 return ERR_PTR(-ENOMEM);
1896
1897         retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1898         BUG_ON(retval < 0);
1899
1900         return skb;
1901 }
1902
1903 /* Called with ovs_mutex or RCU read lock. */
1904 static struct vport *lookup_vport(struct net *net,
1905                                   const struct ovs_header *ovs_header,
1906                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1907 {
1908         struct datapath *dp;
1909         struct vport *vport;
1910
1911         if (a[OVS_VPORT_ATTR_NAME]) {
1912                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1913                 if (!vport)
1914                         return ERR_PTR(-ENODEV);
1915                 if (ovs_header->dp_ifindex &&
1916                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1917                         return ERR_PTR(-ENODEV);
1918                 return vport;
1919         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1920                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1921
1922                 if (port_no >= DP_MAX_PORTS)
1923                         return ERR_PTR(-EFBIG);
1924
1925                 dp = get_dp(net, ovs_header->dp_ifindex);
1926                 if (!dp)
1927                         return ERR_PTR(-ENODEV);
1928
1929                 vport = ovs_vport_ovsl_rcu(dp, port_no);
1930                 if (!vport)
1931                         return ERR_PTR(-ENODEV);
1932                 return vport;
1933         } else
1934                 return ERR_PTR(-EINVAL);
1935 }
1936
1937 /* Called with ovs_mutex */
1938 static void update_headroom(struct datapath *dp)
1939 {
1940         unsigned dev_headroom, max_headroom = 0;
1941         struct net_device *dev;
1942         struct vport *vport;
1943         int i;
1944
1945         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1946                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1947                         dev = vport->dev;
1948                         dev_headroom = netdev_get_fwd_headroom(dev);
1949                         if (dev_headroom > max_headroom)
1950                                 max_headroom = dev_headroom;
1951                 }
1952         }
1953
1954         dp->max_headroom = max_headroom;
1955         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1956                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
1957                         netdev_set_rx_headroom(vport->dev, max_headroom);
1958 }
1959
1960 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1961 {
1962         struct nlattr **a = info->attrs;
1963         struct ovs_header *ovs_header = info->userhdr;
1964         struct vport_parms parms;
1965         struct sk_buff *reply;
1966         struct vport *vport;
1967         struct datapath *dp;
1968         u32 port_no;
1969         int err;
1970
1971         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1972             !a[OVS_VPORT_ATTR_UPCALL_PID])
1973                 return -EINVAL;
1974
1975         port_no = a[OVS_VPORT_ATTR_PORT_NO]
1976                 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1977         if (port_no >= DP_MAX_PORTS)
1978                 return -EFBIG;
1979
1980         reply = ovs_vport_cmd_alloc_info();
1981         if (!reply)
1982                 return -ENOMEM;
1983
1984         ovs_lock();
1985 restart:
1986         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1987         err = -ENODEV;
1988         if (!dp)
1989                 goto exit_unlock_free;
1990
1991         if (port_no) {
1992                 vport = ovs_vport_ovsl(dp, port_no);
1993                 err = -EBUSY;
1994                 if (vport)
1995                         goto exit_unlock_free;
1996         } else {
1997                 for (port_no = 1; ; port_no++) {
1998                         if (port_no >= DP_MAX_PORTS) {
1999                                 err = -EFBIG;
2000                                 goto exit_unlock_free;
2001                         }
2002                         vport = ovs_vport_ovsl(dp, port_no);
2003                         if (!vport)
2004                                 break;
2005                 }
2006         }
2007
2008         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2009         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2010         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2011         parms.dp = dp;
2012         parms.port_no = port_no;
2013         parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2014
2015         vport = new_vport(&parms);
2016         err = PTR_ERR(vport);
2017         if (IS_ERR(vport)) {
2018                 if (err == -EAGAIN)
2019                         goto restart;
2020                 goto exit_unlock_free;
2021         }
2022
2023         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2024                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2025
2026         if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom)
2027                 update_headroom(dp);
2028         else
2029                 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2030
2031         BUG_ON(err < 0);
2032         ovs_unlock();
2033
2034         ovs_notify(&dp_vport_genl_family, reply, info);
2035         return 0;
2036
2037 exit_unlock_free:
2038         ovs_unlock();
2039         kfree_skb(reply);
2040         return err;
2041 }
2042
2043 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2044 {
2045         struct nlattr **a = info->attrs;
2046         struct sk_buff *reply;
2047         struct vport *vport;
2048         int err;
2049
2050         reply = ovs_vport_cmd_alloc_info();
2051         if (!reply)
2052                 return -ENOMEM;
2053
2054         ovs_lock();
2055         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2056         err = PTR_ERR(vport);
2057         if (IS_ERR(vport))
2058                 goto exit_unlock_free;
2059
2060         if (a[OVS_VPORT_ATTR_TYPE] &&
2061             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2062                 err = -EINVAL;
2063                 goto exit_unlock_free;
2064         }
2065
2066         if (a[OVS_VPORT_ATTR_OPTIONS]) {
2067                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2068                 if (err)
2069                         goto exit_unlock_free;
2070         }
2071
2072
2073         if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2074                 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2075
2076                 err = ovs_vport_set_upcall_portids(vport, ids);
2077                 if (err)
2078                         goto exit_unlock_free;
2079         }
2080
2081         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2082                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2083         BUG_ON(err < 0);
2084
2085         ovs_unlock();
2086         ovs_notify(&dp_vport_genl_family, reply, info);
2087         return 0;
2088
2089 exit_unlock_free:
2090         ovs_unlock();
2091         kfree_skb(reply);
2092         return err;
2093 }
2094
2095 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2096 {
2097         bool must_update_headroom = false;
2098         struct nlattr **a = info->attrs;
2099         struct sk_buff *reply;
2100         struct datapath *dp;
2101         struct vport *vport;
2102         int err;
2103
2104         reply = ovs_vport_cmd_alloc_info();
2105         if (!reply)
2106                 return -ENOMEM;
2107
2108         ovs_lock();
2109         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2110         err = PTR_ERR(vport);
2111         if (IS_ERR(vport))
2112                 goto exit_unlock_free;
2113
2114         if (vport->port_no == OVSP_LOCAL) {
2115                 err = -EINVAL;
2116                 goto exit_unlock_free;
2117         }
2118
2119         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2120                                       info->snd_seq, 0, OVS_VPORT_CMD_DEL);
2121         BUG_ON(err < 0);
2122
2123         /* the vport deletion may trigger dp headroom update */
2124         dp = vport->dp;
2125         if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2126                 must_update_headroom = true;
2127         netdev_reset_rx_headroom(vport->dev);
2128         ovs_dp_detach_port(vport);
2129
2130         if (must_update_headroom)
2131                 update_headroom(dp);
2132         ovs_unlock();
2133
2134         ovs_notify(&dp_vport_genl_family, reply, info);
2135         return 0;
2136
2137 exit_unlock_free:
2138         ovs_unlock();
2139         kfree_skb(reply);
2140         return err;
2141 }
2142
2143 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2144 {
2145         struct nlattr **a = info->attrs;
2146         struct ovs_header *ovs_header = info->userhdr;
2147         struct sk_buff *reply;
2148         struct vport *vport;
2149         int err;
2150
2151         reply = ovs_vport_cmd_alloc_info();
2152         if (!reply)
2153                 return -ENOMEM;
2154
2155         rcu_read_lock();
2156         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2157         err = PTR_ERR(vport);
2158         if (IS_ERR(vport))
2159                 goto exit_unlock_free;
2160         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2161                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2162         BUG_ON(err < 0);
2163         rcu_read_unlock();
2164
2165         return genlmsg_reply(reply, info);
2166
2167 exit_unlock_free:
2168         rcu_read_unlock();
2169         kfree_skb(reply);
2170         return err;
2171 }
2172
2173 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2174 {
2175         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2176         struct datapath *dp;
2177         int bucket = cb->args[0], skip = cb->args[1];
2178         int i, j = 0;
2179
2180         rcu_read_lock();
2181         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2182         if (!dp) {
2183                 rcu_read_unlock();
2184                 return -ENODEV;
2185         }
2186         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2187                 struct vport *vport;
2188
2189                 j = 0;
2190                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2191                         if (j >= skip &&
2192                             ovs_vport_cmd_fill_info(vport, skb,
2193                                                     NETLINK_CB(cb->skb).portid,
2194                                                     cb->nlh->nlmsg_seq,
2195                                                     NLM_F_MULTI,
2196                                                     OVS_VPORT_CMD_NEW) < 0)
2197                                 goto out;
2198
2199                         j++;
2200                 }
2201                 skip = 0;
2202         }
2203 out:
2204         rcu_read_unlock();
2205
2206         cb->args[0] = i;
2207         cb->args[1] = j;
2208
2209         return skb->len;
2210 }
2211
2212 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2213         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2214         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2215         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2216         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2217         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2218         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2219 };
2220
2221 static const struct genl_ops dp_vport_genl_ops[] = {
2222         { .cmd = OVS_VPORT_CMD_NEW,
2223           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2224           .policy = vport_policy,
2225           .doit = ovs_vport_cmd_new
2226         },
2227         { .cmd = OVS_VPORT_CMD_DEL,
2228           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2229           .policy = vport_policy,
2230           .doit = ovs_vport_cmd_del
2231         },
2232         { .cmd = OVS_VPORT_CMD_GET,
2233           .flags = 0,               /* OK for unprivileged users. */
2234           .policy = vport_policy,
2235           .doit = ovs_vport_cmd_get,
2236           .dumpit = ovs_vport_cmd_dump
2237         },
2238         { .cmd = OVS_VPORT_CMD_SET,
2239           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2240           .policy = vport_policy,
2241           .doit = ovs_vport_cmd_set,
2242         },
2243 };
2244
2245 struct genl_family dp_vport_genl_family = {
2246         .id = GENL_ID_GENERATE,
2247         .hdrsize = sizeof(struct ovs_header),
2248         .name = OVS_VPORT_FAMILY,
2249         .version = OVS_VPORT_VERSION,
2250         .maxattr = OVS_VPORT_ATTR_MAX,
2251         .netnsok = true,
2252         .parallel_ops = true,
2253         .ops = dp_vport_genl_ops,
2254         .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2255         .mcgrps = &ovs_dp_vport_multicast_group,
2256         .n_mcgrps = 1,
2257 };
2258
2259 static struct genl_family * const dp_genl_families[] = {
2260         &dp_datapath_genl_family,
2261         &dp_vport_genl_family,
2262         &dp_flow_genl_family,
2263         &dp_packet_genl_family,
2264 };
2265
2266 static void dp_unregister_genl(int n_families)
2267 {
2268         int i;
2269
2270         for (i = 0; i < n_families; i++)
2271                 genl_unregister_family(dp_genl_families[i]);
2272 }
2273
2274 static int dp_register_genl(void)
2275 {
2276         int err;
2277         int i;
2278
2279         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2280
2281                 err = genl_register_family(dp_genl_families[i]);
2282                 if (err)
2283                         goto error;
2284         }
2285
2286         return 0;
2287
2288 error:
2289         dp_unregister_genl(i);
2290         return err;
2291 }
2292
2293 static int __net_init ovs_init_net(struct net *net)
2294 {
2295         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2296
2297         INIT_LIST_HEAD(&ovs_net->dps);
2298         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2299         ovs_ct_init(net);
2300         return 0;
2301 }
2302
2303 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2304                                             struct list_head *head)
2305 {
2306         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2307         struct datapath *dp;
2308
2309         list_for_each_entry(dp, &ovs_net->dps, list_node) {
2310                 int i;
2311
2312                 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2313                         struct vport *vport;
2314
2315                         hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2316                                 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2317                                         continue;
2318
2319                                 if (dev_net(vport->dev) == dnet)
2320                                         list_add(&vport->detach_list, head);
2321                         }
2322                 }
2323         }
2324 }
2325
2326 static void __net_exit ovs_exit_net(struct net *dnet)
2327 {
2328         struct datapath *dp, *dp_next;
2329         struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2330         struct vport *vport, *vport_next;
2331         struct net *net;
2332         LIST_HEAD(head);
2333
2334         ovs_ct_exit(dnet);
2335         ovs_lock();
2336         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2337                 __dp_destroy(dp);
2338
2339         rtnl_lock();
2340         for_each_net(net)
2341                 list_vports_from_net(net, dnet, &head);
2342         rtnl_unlock();
2343
2344         /* Detach all vports from given namespace. */
2345         list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2346                 list_del(&vport->detach_list);
2347                 ovs_dp_detach_port(vport);
2348         }
2349
2350         ovs_unlock();
2351
2352         cancel_work_sync(&ovs_net->dp_notify_work);
2353 }
2354
2355 static struct pernet_operations ovs_net_ops = {
2356         .init = ovs_init_net,
2357         .exit = ovs_exit_net,
2358         .id   = &ovs_net_id,
2359         .size = sizeof(struct ovs_net),
2360 };
2361
2362 static int __init dp_init(void)
2363 {
2364         int err;
2365
2366         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2367
2368         pr_info("Open vSwitch switching datapath\n");
2369
2370         err = action_fifos_init();
2371         if (err)
2372                 goto error;
2373
2374         err = ovs_internal_dev_rtnl_link_register();
2375         if (err)
2376                 goto error_action_fifos_exit;
2377
2378         err = ovs_flow_init();
2379         if (err)
2380                 goto error_unreg_rtnl_link;
2381
2382         err = ovs_vport_init();
2383         if (err)
2384                 goto error_flow_exit;
2385
2386         err = register_pernet_device(&ovs_net_ops);
2387         if (err)
2388                 goto error_vport_exit;
2389
2390         err = register_netdevice_notifier(&ovs_dp_device_notifier);
2391         if (err)
2392                 goto error_netns_exit;
2393
2394         err = ovs_netdev_init();
2395         if (err)
2396                 goto error_unreg_notifier;
2397
2398         err = dp_register_genl();
2399         if (err < 0)
2400                 goto error_unreg_netdev;
2401
2402         return 0;
2403
2404 error_unreg_netdev:
2405         ovs_netdev_exit();
2406 error_unreg_notifier:
2407         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2408 error_netns_exit:
2409         unregister_pernet_device(&ovs_net_ops);
2410 error_vport_exit:
2411         ovs_vport_exit();
2412 error_flow_exit:
2413         ovs_flow_exit();
2414 error_unreg_rtnl_link:
2415         ovs_internal_dev_rtnl_link_unregister();
2416 error_action_fifos_exit:
2417         action_fifos_exit();
2418 error:
2419         return err;
2420 }
2421
2422 static void dp_cleanup(void)
2423 {
2424         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2425         ovs_netdev_exit();
2426         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2427         unregister_pernet_device(&ovs_net_ops);
2428         rcu_barrier();
2429         ovs_vport_exit();
2430         ovs_flow_exit();
2431         ovs_internal_dev_rtnl_link_unregister();
2432         action_fifos_exit();
2433 }
2434
2435 module_init(dp_init);
2436 module_exit(dp_cleanup);
2437
2438 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2439 MODULE_LICENSE("GPL");