net/openvswitch/datapath.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2014 Nicira, Inc.
   4  */
   5
   6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7
   8 #include <linux/init.h>
   9 #include <linux/module.h>
  10 #include <linux/if_arp.h>
  11 #include <linux/if_vlan.h>
  12 #include <linux/in.h>
  13 #include <linux/ip.h>
  14 #include <linux/jhash.h>
  15 #include <linux/delay.h>
  16 #include <linux/time.h>
  17 #include <linux/etherdevice.h>
  18 #include <linux/genetlink.h>
  19 #include <linux/kernel.h>
  20 #include <linux/kthread.h>
  21 #include <linux/mutex.h>
  22 #include <linux/percpu.h>
  23 #include <linux/rcupdate.h>
  24 #include <linux/tcp.h>
  25 #include <linux/udp.h>
  26 #include <linux/ethtool.h>
  27 #include <linux/wait.h>
  28 #include <asm/div64.h>
  29 #include <linux/highmem.h>
  30 #include <linux/netfilter_bridge.h>
  31 #include <linux/netfilter_ipv4.h>
  32 #include <linux/inetdevice.h>
  33 #include <linux/list.h>
  34 #include <linux/openvswitch.h>
  35 #include <linux/rculist.h>
  36 #include <linux/dmi.h>
  37 #include <net/genetlink.h>
  38 #include <net/net_namespace.h>
  39 #include <net/netns/generic.h>
  40
  41 #include "datapath.h"
  42 #include "flow.h"
  43 #include "flow_table.h"
  44 #include "flow_netlink.h"
  45 #include "meter.h"
  46 #include "vport-internal_dev.h"
  47 #include "vport-netdev.h"
  48
  49 unsigned int ovs_net_id __read_mostly;
  50
  51 static struct genl_family dp_packet_genl_family;
  52 static struct genl_family dp_flow_genl_family;
  53 static struct genl_family dp_datapath_genl_family;
  54
  55 static const struct nla_policy flow_policy[];
  56
  57 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
  58         .name = OVS_FLOW_MCGROUP,
  59 };
  60
  61 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
  62         .name = OVS_DATAPATH_MCGROUP,
  63 };
  64
  65 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
  66         .name = OVS_VPORT_MCGROUP,
  67 };
  68
  69 /* Check if need to build a reply message.
  70  * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
  71 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
  72                             unsigned int group)
  73 {
  74         return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
  75                genl_has_listeners(family, genl_info_net(info), group);
  76 }
  77
  78 static void ovs_notify(struct genl_family *family,
  79                        struct sk_buff *skb, struct genl_info *info)
  80 {
  81         genl_notify(family, skb, info, 0, GFP_KERNEL);
  82 }
  83
  84 /**
  85  * DOC: Locking:
  86  *
  87  * All writes e.g. Writes to device state (add/remove datapath, port, set
  88  * operations on vports, etc.), Writes to other state (flow table
  89  * modifications, set miscellaneous datapath parameters, etc.) are protected
  90  * by ovs_lock.
  91  *
  92  * Reads are protected by RCU.
  93  *
  94  * There are a few special cases (mostly stats) that have their own
  95  * synchronization but they nest under all of above and don't interact with
  96  * each other.
  97  *
  98  * The RTNL lock nests inside ovs_mutex.
  99  */
 100
 101 static DEFINE_MUTEX(ovs_mutex);
 102
 103 void ovs_lock(void)
 104 {
 105         mutex_lock(&ovs_mutex);
 106 }
 107
 108 void ovs_unlock(void)
 109 {
 110         mutex_unlock(&ovs_mutex);
 111 }
 112
 113 #ifdef CONFIG_LOCKDEP
 114 int lockdep_ovsl_is_held(void)
 115 {
 116         if (debug_locks)
 117                 return lockdep_is_held(&ovs_mutex);
 118         else
 119                 return 1;
 120 }
 121 #endif
 122
 123 static struct vport *new_vport(const struct vport_parms *);
 124 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
 125                              const struct sw_flow_key *,
 126                              const struct dp_upcall_info *,
 127                              uint32_t cutlen);
 128 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
 129                                   const struct sw_flow_key *,
 130                                   const struct dp_upcall_info *,
 131                                   uint32_t cutlen);
 132
 133 /* Must be called with rcu_read_lock or ovs_mutex. */
 134 const char *ovs_dp_name(const struct datapath *dp)
 135 {
 136         struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
 137         return ovs_vport_name(vport);
 138 }
 139
 140 static int get_dpifindex(const struct datapath *dp)
 141 {
 142         struct vport *local;
 143         int ifindex;
 144
 145         rcu_read_lock();
 146
 147         local = ovs_vport_rcu(dp, OVSP_LOCAL);
 148         if (local)
 149                 ifindex = local->dev->ifindex;
 150         else
 151                 ifindex = 0;
 152
 153         rcu_read_unlock();
 154
 155         return ifindex;
 156 }
 157
 158 static void destroy_dp_rcu(struct rcu_head *rcu)
 159 {
 160         struct datapath *dp = container_of(rcu, struct datapath, rcu);
 161
 162         ovs_flow_tbl_destroy(&dp->table);
 163         free_percpu(dp->stats_percpu);
 164         kfree(dp->ports);
 165         ovs_meters_exit(dp);
 166         kfree(dp);
 167 }
 168
 169 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
 170                                             u16 port_no)
 171 {
 172         return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
 173 }
 174
 175 /* Called with ovs_mutex or RCU read lock. */
 176 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
 177 {
 178         struct vport *vport;
 179         struct hlist_head *head;
 180
 181         head = vport_hash_bucket(dp, port_no);
 182         hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
 183                 if (vport->port_no == port_no)
 184                         return vport;
 185         }
 186         return NULL;
 187 }
 188
 189 /* Called with ovs_mutex. */
 190 static struct vport *new_vport(const struct vport_parms *parms)
 191 {
 192         struct vport *vport;
 193
 194         vport = ovs_vport_add(parms);
 195         if (!IS_ERR(vport)) {
 196                 struct datapath *dp = parms->dp;
 197                 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
 198
 199                 hlist_add_head_rcu(&vport->dp_hash_node, head);
 200         }
 201         return vport;
 202 }
 203
 204 void ovs_dp_detach_port(struct vport *p)
 205 {
 206         ASSERT_OVSL();
 207
 208         /* First drop references to device. */
 209         hlist_del_rcu(&p->dp_hash_node);
 210
 211         /* Then destroy it. */
 212         ovs_vport_del(p);
 213 }
 214
 215 /* Must be called with rcu_read_lock. */
 216 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
 217 {
 218         const struct vport *p = OVS_CB(skb)->input_vport;
 219         struct datapath *dp = p->dp;
 220         struct sw_flow *flow;
 221         struct sw_flow_actions *sf_acts;
 222         struct dp_stats_percpu *stats;
 223         u64 *stats_counter;
 224         u32 n_mask_hit;
 225         int error;
 226
 227         stats = this_cpu_ptr(dp->stats_percpu);
 228
 229         /* Look up flow. */
 230         flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb),
 231                                          &n_mask_hit);
 232         if (unlikely(!flow)) {
 233                 struct dp_upcall_info upcall;
 234
 235                 memset(&upcall, 0, sizeof(upcall));
 236                 upcall.cmd = OVS_PACKET_CMD_MISS;
 237                 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
 238                 upcall.mru = OVS_CB(skb)->mru;
 239                 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
 240                 if (unlikely(error))
 241                         kfree_skb(skb);
 242                 else
 243                         consume_skb(skb);
 244                 stats_counter = &stats->n_missed;
 245                 goto out;
 246         }
 247
 248         ovs_flow_stats_update(flow, key->tp.flags, skb);
 249         sf_acts = rcu_dereference(flow->sf_acts);
 250         error = ovs_execute_actions(dp, skb, sf_acts, key);
 251         if (unlikely(error))
 252                 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n",
 253                                                         ovs_dp_name(dp), error);
 254
 255         stats_counter = &stats->n_hit;
 256
 257 out:
 258         /* Update datapath statistics. */
 259         u64_stats_update_begin(&stats->syncp);
 260         (*stats_counter)++;
 261         stats->n_mask_hit += n_mask_hit;
 262         u64_stats_update_end(&stats->syncp);
 263 }
 264
 265 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
 266                   const struct sw_flow_key *key,
 267                   const struct dp_upcall_info *upcall_info,
 268                   uint32_t cutlen)
 269 {
 270         struct dp_stats_percpu *stats;
 271         int err;
 272
 273         if (upcall_info->portid == 0) {
 274                 err = -ENOTCONN;
 275                 goto err;
 276         }
 277
 278         if (!skb_is_gso(skb))
 279                 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
 280         else
 281                 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
 282         if (err)
 283                 goto err;
 284
 285         return 0;
 286
 287 err:
 288         stats = this_cpu_ptr(dp->stats_percpu);
 289
 290         u64_stats_update_begin(&stats->syncp);
 291         stats->n_lost++;
 292         u64_stats_update_end(&stats->syncp);
 293
 294         return err;
 295 }
 296
 297 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
 298                              const struct sw_flow_key *key,
 299                              const struct dp_upcall_info *upcall_info,
 300                                  uint32_t cutlen)
 301 {
 302         unsigned int gso_type = skb_shinfo(skb)->gso_type;
 303         struct sw_flow_key later_key;
 304         struct sk_buff *segs, *nskb;
 305         int err;
 306
 307         BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET);
 308         segs = __skb_gso_segment(skb, NETIF_F_SG, false);
 309         if (IS_ERR(segs))
 310                 return PTR_ERR(segs);
 311         if (segs == NULL)
 312                 return -EINVAL;
 313
 314         if (gso_type & SKB_GSO_UDP) {
 315                 /* The initial flow key extracted by ovs_flow_key_extract()
 316                  * in this case is for a first fragment, so we need to
 317                  * properly mark later fragments.
 318                  */
 319                 later_key = *key;
 320                 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
 321         }
 322
 323         /* Queue all of the segments. */
 324         skb = segs;
 325         do {
 326                 if (gso_type & SKB_GSO_UDP && skb != segs)
 327                         key = &later_key;
 328
 329                 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
 330                 if (err)
 331                         break;
 332
 333         } while ((skb = skb->next));
 334
 335         /* Free all of the segments. */
 336         skb = segs;
 337         do {
 338                 nskb = skb->next;
 339                 if (err)
 340                         kfree_skb(skb);
 341                 else
 342                         consume_skb(skb);
 343         } while ((skb = nskb));
 344         return err;
 345 }
 346
 347 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
 348                               unsigned int hdrlen, int actions_attrlen)
 349 {
 350         size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
 351                 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
 352                 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
 353                 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */
 354                 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */
 355
 356         /* OVS_PACKET_ATTR_USERDATA */
 357         if (upcall_info->userdata)
 358                 size += NLA_ALIGN(upcall_info->userdata->nla_len);
 359
 360         /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
 361         if (upcall_info->egress_tun_info)
 362                 size += nla_total_size(ovs_tun_key_attr_size());
 363
 364         /* OVS_PACKET_ATTR_ACTIONS */
 365         if (upcall_info->actions_len)
 366                 size += nla_total_size(actions_attrlen);
 367
 368         /* OVS_PACKET_ATTR_MRU */
 369         if (upcall_info->mru)
 370                 size += nla_total_size(sizeof(upcall_info->mru));
 371
 372         return size;
 373 }
 374
 375 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
 376 {
 377         if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
 378                 size_t plen = NLA_ALIGN(skb->len) - skb->len;
 379
 380                 if (plen > 0)
 381                         skb_put_zero(skb, plen);
 382         }
 383 }
 384
 385 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
 386                                   const struct sw_flow_key *key,
 387                                   const struct dp_upcall_info *upcall_info,
 388                                   uint32_t cutlen)
 389 {
 390         struct ovs_header *upcall;
 391         struct sk_buff *nskb = NULL;
 392         struct sk_buff *user_skb = NULL; /* to be queued to userspace */
 393         struct nlattr *nla;
 394         size_t len;
 395         unsigned int hlen;
 396         int err, dp_ifindex;
 397         u64 hash;
 398
 399         dp_ifindex = get_dpifindex(dp);
 400         if (!dp_ifindex)
 401                 return -ENODEV;
 402
 403         if (skb_vlan_tag_present(skb)) {
 404                 nskb = skb_clone(skb, GFP_ATOMIC);
 405                 if (!nskb)
 406                         return -ENOMEM;
 407
 408                 nskb = __vlan_hwaccel_push_inside(nskb);
 409                 if (!nskb)
 410                         return -ENOMEM;
 411
 412                 skb = nskb;
 413         }
 414
 415         if (nla_attr_size(skb->len) > USHRT_MAX) {
 416                 err = -EFBIG;
 417                 goto out;
 418         }
 419
 420         /* Complete checksum if needed */
 421         if (skb->ip_summed == CHECKSUM_PARTIAL &&
 422             (err = skb_csum_hwoffload_help(skb, 0)))
 423                 goto out;
 424
 425         /* Older versions of OVS user space enforce alignment of the last
 426          * Netlink attribute to NLA_ALIGNTO which would require extensive
 427          * padding logic. Only perform zerocopy if padding is not required.
 428          */
 429         if (dp->user_features & OVS_DP_F_UNALIGNED)
 430                 hlen = skb_zerocopy_headlen(skb);
 431         else
 432                 hlen = skb->len;
 433
 434         len = upcall_msg_size(upcall_info, hlen - cutlen,
 435                               OVS_CB(skb)->acts_origlen);
 436         user_skb = genlmsg_new(len, GFP_ATOMIC);
 437         if (!user_skb) {
 438                 err = -ENOMEM;
 439                 goto out;
 440         }
 441
 442         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
 443                              0, upcall_info->cmd);
 444         if (!upcall) {
 445                 err = -EINVAL;
 446                 goto out;
 447         }
 448         upcall->dp_ifindex = dp_ifindex;
 449
 450         err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
 451         if (err)
 452                 goto out;
 453
 454         if (upcall_info->userdata)
 455                 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
 456                           nla_len(upcall_info->userdata),
 457                           nla_data(upcall_info->userdata));
 458
 459         if (upcall_info->egress_tun_info) {
 460                 nla = nla_nest_start_noflag(user_skb,
 461                                             OVS_PACKET_ATTR_EGRESS_TUN_KEY);
 462                 if (!nla) {
 463                         err = -EMSGSIZE;
 464                         goto out;
 465                 }
 466                 err = ovs_nla_put_tunnel_info(user_skb,
 467                                               upcall_info->egress_tun_info);
 468                 if (err)
 469                         goto out;
 470
 471                 nla_nest_end(user_skb, nla);
 472         }
 473
 474         if (upcall_info->actions_len) {
 475                 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS);
 476                 if (!nla) {
 477                         err = -EMSGSIZE;
 478                         goto out;
 479                 }
 480                 err = ovs_nla_put_actions(upcall_info->actions,
 481                                           upcall_info->actions_len,
 482                                           user_skb);
 483                 if (!err)
 484                         nla_nest_end(user_skb, nla);
 485                 else
 486                         nla_nest_cancel(user_skb, nla);
 487         }
 488
 489         /* Add OVS_PACKET_ATTR_MRU */
 490         if (upcall_info->mru &&
 491             nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) {
 492                 err = -ENOBUFS;
 493                 goto out;
 494         }
 495
 496         /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
 497         if (cutlen > 0 &&
 498             nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) {
 499                 err = -ENOBUFS;
 500                 goto out;
 501         }
 502
 503         /* Add OVS_PACKET_ATTR_HASH */
 504         hash = skb_get_hash_raw(skb);
 505         if (skb->sw_hash)
 506                 hash |= OVS_PACKET_HASH_SW_BIT;
 507
 508         if (skb->l4_hash)
 509                 hash |= OVS_PACKET_HASH_L4_BIT;
 510
 511         if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) {
 512                 err = -ENOBUFS;
 513                 goto out;
 514         }
 515
 516         /* Only reserve room for attribute header, packet data is added
 517          * in skb_zerocopy() */
 518         if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
 519                 err = -ENOBUFS;
 520                 goto out;
 521         }
 522         nla->nla_len = nla_attr_size(skb->len - cutlen);
 523
 524         err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
 525         if (err)
 526                 goto out;
 527
 528         /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
 529         pad_packet(dp, user_skb);
 530
 531         ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
 532
 533         err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
 534         user_skb = NULL;
 535 out:
 536         if (err)
 537                 skb_tx_error(skb);
 538         kfree_skb(user_skb);
 539         kfree_skb(nskb);
 540         return err;
 541 }
 542
 543 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 544 {
 545         struct ovs_header *ovs_header = info->userhdr;
 546         struct net *net = sock_net(skb->sk);
 547         struct nlattr **a = info->attrs;
 548         struct sw_flow_actions *acts;
 549         struct sk_buff *packet;
 550         struct sw_flow *flow;
 551         struct sw_flow_actions *sf_acts;
 552         struct datapath *dp;
 553         struct vport *input_vport;
 554         u16 mru = 0;
 555         u64 hash;
 556         int len;
 557         int err;
 558         bool log = !a[OVS_PACKET_ATTR_PROBE];
 559
 560         err = -EINVAL;
 561         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 562             !a[OVS_PACKET_ATTR_ACTIONS])
 563                 goto err;
 564
 565         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 566         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 567         err = -ENOMEM;
 568         if (!packet)
 569                 goto err;
 570         skb_reserve(packet, NET_IP_ALIGN);
 571
 572         nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
 573
 574         /* Set packet's mru */
 575         if (a[OVS_PACKET_ATTR_MRU]) {
 576                 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
 577                 packet->ignore_df = 1;
 578         }
 579         OVS_CB(packet)->mru = mru;
 580
 581         if (a[OVS_PACKET_ATTR_HASH]) {
 582                 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]);
 583
 584                 __skb_set_hash(packet, hash & 0xFFFFFFFFULL,
 585                                !!(hash & OVS_PACKET_HASH_SW_BIT),
 586                                !!(hash & OVS_PACKET_HASH_L4_BIT));
 587         }
 588
 589         /* Build an sw_flow for sending this packet. */
 590         flow = ovs_flow_alloc();
 591         err = PTR_ERR(flow);
 592         if (IS_ERR(flow))
 593                 goto err_kfree_skb;
 594
 595         err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
 596                                              packet, &flow->key, log);
 597         if (err)
 598                 goto err_flow_free;
 599
 600         err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
 601                                    &flow->key, &acts, log);
 602         if (err)
 603                 goto err_flow_free;
 604
 605         rcu_assign_pointer(flow->sf_acts, acts);
 606         packet->priority = flow->key.phy.priority;
 607         packet->mark = flow->key.phy.skb_mark;
 608
 609         rcu_read_lock();
 610         dp = get_dp_rcu(net, ovs_header->dp_ifindex);
 611         err = -ENODEV;
 612         if (!dp)
 613                 goto err_unlock;
 614
 615         input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
 616         if (!input_vport)
 617                 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
 618
 619         if (!input_vport)
 620                 goto err_unlock;
 621
 622         packet->dev = input_vport->dev;
 623         OVS_CB(packet)->input_vport = input_vport;
 624         sf_acts = rcu_dereference(flow->sf_acts);
 625
 626         local_bh_disable();
 627         err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
 628         local_bh_enable();
 629         rcu_read_unlock();
 630
 631         ovs_flow_free(flow, false);
 632         return err;
 633
 634 err_unlock:
 635         rcu_read_unlock();
 636 err_flow_free:
 637         ovs_flow_free(flow, false);
 638 err_kfree_skb:
 639         kfree_skb(packet);
 640 err:
 641         return err;
 642 }
 643
 644 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 645         [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
 646         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 647         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 648         [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
 649         [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
 650 };
 651
 652 static const struct genl_ops dp_packet_genl_ops[] = {
 653         { .cmd = OVS_PACKET_CMD_EXECUTE,
 654           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
 655           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 656           .doit = ovs_packet_cmd_execute
 657         }
 658 };
 659
 660 static struct genl_family dp_packet_genl_family __ro_after_init = {
 661         .hdrsize = sizeof(struct ovs_header),
 662         .name = OVS_PACKET_FAMILY,
 663         .version = OVS_PACKET_VERSION,
 664         .maxattr = OVS_PACKET_ATTR_MAX,
 665         .policy = packet_policy,
 666         .netnsok = true,
 667         .parallel_ops = true,
 668         .ops = dp_packet_genl_ops,
 669         .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
 670         .module = THIS_MODULE,
 671 };
 672
 673 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
 674                          struct ovs_dp_megaflow_stats *mega_stats)
 675 {
 676         int i;
 677
 678         memset(mega_stats, 0, sizeof(*mega_stats));
 679
 680         stats->n_flows = ovs_flow_tbl_count(&dp->table);
 681         mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
 682
 683         stats->n_hit = stats->n_missed = stats->n_lost = 0;
 684
 685         for_each_possible_cpu(i) {
 686                 const struct dp_stats_percpu *percpu_stats;
 687                 struct dp_stats_percpu local_stats;
 688                 unsigned int start;
 689
 690                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 691
 692                 do {
 693                         start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
 694                         local_stats = *percpu_stats;
 695                 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
 696
 697                 stats->n_hit += local_stats.n_hit;
 698                 stats->n_missed += local_stats.n_missed;
 699                 stats->n_lost += local_stats.n_lost;
 700                 mega_stats->n_mask_hit += local_stats.n_mask_hit;
 701         }
 702 }
 703
 704 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
 705 {
 706         return ovs_identifier_is_ufid(sfid) &&
 707                !(ufid_flags & OVS_UFID_F_OMIT_KEY);
 708 }
 709
 710 static bool should_fill_mask(uint32_t ufid_flags)
 711 {
 712         return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
 713 }
 714
 715 static bool should_fill_actions(uint32_t ufid_flags)
 716 {
 717         return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
 718 }
 719
 720 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
 721                                     const struct sw_flow_id *sfid,
 722                                     uint32_t ufid_flags)
 723 {
 724         size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
 725
 726         /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
 727          * see ovs_nla_put_identifier()
 728          */
 729         if (sfid && ovs_identifier_is_ufid(sfid))
 730                 len += nla_total_size(sfid->ufid_len);
 731         else
 732                 len += nla_total_size(ovs_key_attr_size());
 733
 734         /* OVS_FLOW_ATTR_KEY */
 735         if (!sfid || should_fill_key(sfid, ufid_flags))
 736                 len += nla_total_size(ovs_key_attr_size());
 737
 738         /* OVS_FLOW_ATTR_MASK */
 739         if (should_fill_mask(ufid_flags))
 740                 len += nla_total_size(ovs_key_attr_size());
 741
 742         /* OVS_FLOW_ATTR_ACTIONS */
 743         if (should_fill_actions(ufid_flags))
 744                 len += nla_total_size(acts->orig_len);
 745
 746         return len
 747                 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
 748                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
 749                 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
 750 }
 751
 752 /* Called with ovs_mutex or RCU read lock. */
 753 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
 754                                    struct sk_buff *skb)
 755 {
 756         struct ovs_flow_stats stats;
 757         __be16 tcp_flags;
 758         unsigned long used;
 759
 760         ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
 761
 762         if (used &&
 763             nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
 764                               OVS_FLOW_ATTR_PAD))
 765                 return -EMSGSIZE;
 766
 767         if (stats.n_packets &&
 768             nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
 769                           sizeof(struct ovs_flow_stats), &stats,
 770                           OVS_FLOW_ATTR_PAD))
 771                 return -EMSGSIZE;
 772
 773         if ((u8)ntohs(tcp_flags) &&
 774              nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
 775                 return -EMSGSIZE;
 776
 777         return 0;
 778 }
 779
 780 /* Called with ovs_mutex or RCU read lock. */
 781 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
 782                                      struct sk_buff *skb, int skb_orig_len)
 783 {
 784         struct nlattr *start;
 785         int err;
 786
 787         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 788          * this is the first flow to be dumped into 'skb'.  This is unusual for
 789          * Netlink but individual action lists can be longer than
 790          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 791          * The userspace caller can always fetch the actions separately if it
 792          * really wants them.  (Most userspace callers in fact don't care.)
 793          *
 794          * This can only fail for dump operations because the skb is always
 795          * properly sized for single flows.
 796          */
 797         start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS);
 798         if (start) {
 799                 const struct sw_flow_actions *sf_acts;
 800
 801                 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
 802                 err = ovs_nla_put_actions(sf_acts->actions,
 803                                           sf_acts->actions_len, skb);
 804
 805                 if (!err)
 806                         nla_nest_end(skb, start);
 807                 else {
 808                         if (skb_orig_len)
 809                                 return err;
 810
 811                         nla_nest_cancel(skb, start);
 812                 }
 813         } else if (skb_orig_len) {
 814                 return -EMSGSIZE;
 815         }
 816
 817         return 0;
 818 }
 819
 820 /* Called with ovs_mutex or RCU read lock. */
 821 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
 822                                   struct sk_buff *skb, u32 portid,
 823                                   u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
 824 {
 825         const int skb_orig_len = skb->len;
 826         struct ovs_header *ovs_header;
 827         int err;
 828
 829         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
 830                                  flags, cmd);
 831         if (!ovs_header)
 832                 return -EMSGSIZE;
 833
 834         ovs_header->dp_ifindex = dp_ifindex;
 835
 836         err = ovs_nla_put_identifier(flow, skb);
 837         if (err)
 838                 goto error;
 839
 840         if (should_fill_key(&flow->id, ufid_flags)) {
 841                 err = ovs_nla_put_masked_key(flow, skb);
 842                 if (err)
 843                         goto error;
 844         }
 845
 846         if (should_fill_mask(ufid_flags)) {
 847                 err = ovs_nla_put_mask(flow, skb);
 848                 if (err)
 849                         goto error;
 850         }
 851
 852         err = ovs_flow_cmd_fill_stats(flow, skb);
 853         if (err)
 854                 goto error;
 855
 856         if (should_fill_actions(ufid_flags)) {
 857                 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
 858                 if (err)
 859                         goto error;
 860         }
 861
 862         genlmsg_end(skb, ovs_header);
 863         return 0;
 864
 865 error:
 866         genlmsg_cancel(skb, ovs_header);
 867         return err;
 868 }
 869
 870 /* May not be called with RCU read lock. */
 871 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
 872                                                const struct sw_flow_id *sfid,
 873                                                struct genl_info *info,
 874                                                bool always,
 875                                                uint32_t ufid_flags)
 876 {
 877         struct sk_buff *skb;
 878         size_t len;
 879
 880         if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
 881                 return NULL;
 882
 883         len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
 884         skb = genlmsg_new(len, GFP_KERNEL);
 885         if (!skb)
 886                 return ERR_PTR(-ENOMEM);
 887
 888         return skb;
 889 }
 890
 891 /* Called with ovs_mutex. */
 892 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
 893                                                int dp_ifindex,
 894                                                struct genl_info *info, u8 cmd,
 895                                                bool always, u32 ufid_flags)
 896 {
 897         struct sk_buff *skb;
 898         int retval;
 899
 900         skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
 901                                       &flow->id, info, always, ufid_flags);
 902         if (IS_ERR_OR_NULL(skb))
 903                 return skb;
 904
 905         retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
 906                                         info->snd_portid, info->snd_seq, 0,
 907                                         cmd, ufid_flags);
 908         BUG_ON(retval < 0);
 909         return skb;
 910 }
 911
 912 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
 913 {
 914         struct net *net = sock_net(skb->sk);
 915         struct nlattr **a = info->attrs;
 916         struct ovs_header *ovs_header = info->userhdr;
 917         struct sw_flow *flow = NULL, *new_flow;
 918         struct sw_flow_mask mask;
 919         struct sk_buff *reply;
 920         struct datapath *dp;
 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, &new_flow->key, false, &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         /* Extract flow identifier. */
 955         error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
 956                                        &new_flow->key, log);
 957         if (error)
 958                 goto err_kfree_flow;
 959
 960         /* unmasked key is needed to match when ufid is not used. */
 961         if (ovs_identifier_is_key(&new_flow->id))
 962                 match.key = new_flow->id.unmasked_key;
 963
 964         ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
 965
 966         /* Validate actions. */
 967         error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
 968                                      &new_flow->key, &acts, log);
 969         if (error) {
 970                 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
 971                 goto err_kfree_flow;
 972         }
 973
 974         reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
 975                                         ufid_flags);
 976         if (IS_ERR(reply)) {
 977                 error = PTR_ERR(reply);
 978                 goto err_kfree_acts;
 979         }
 980
 981         ovs_lock();
 982         dp = get_dp(net, ovs_header->dp_ifindex);
 983         if (unlikely(!dp)) {
 984                 error = -ENODEV;
 985                 goto err_unlock_ovs;
 986         }
 987
 988         /* Check if this is a duplicate flow */
 989         if (ovs_identifier_is_ufid(&new_flow->id))
 990                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
 991         if (!flow)
 992                 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
 993         if (likely(!flow)) {
 994                 rcu_assign_pointer(new_flow->sf_acts, acts);
 995
 996                 /* Put flow in bucket. */
 997                 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
 998                 if (unlikely(error)) {
 999                         acts = NULL;
1000                         goto err_unlock_ovs;
1001                 }
1002
1003                 if (unlikely(reply)) {
1004                         error = ovs_flow_cmd_fill_info(new_flow,
1005                                                        ovs_header->dp_ifindex,
1006                                                        reply, info->snd_portid,
1007                                                        info->snd_seq, 0,
1008                                                        OVS_FLOW_CMD_NEW,
1009                                                        ufid_flags);
1010                         BUG_ON(error < 0);
1011                 }
1012                 ovs_unlock();
1013         } else {
1014                 struct sw_flow_actions *old_acts;
1015
1016                 /* Bail out if we're not allowed to modify an existing flow.
1017                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1018                  * because Generic Netlink treats the latter as a dump
1019                  * request.  We also accept NLM_F_EXCL in case that bug ever
1020                  * gets fixed.
1021                  */
1022                 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1023                                                          | NLM_F_EXCL))) {
1024                         error = -EEXIST;
1025                         goto err_unlock_ovs;
1026                 }
1027                 /* The flow identifier has to be the same for flow updates.
1028                  * Look for any overlapping flow.
1029                  */
1030                 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1031                         if (ovs_identifier_is_key(&flow->id))
1032                                 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1033                                                                  &match);
1034                         else /* UFID matches but key is different */
1035                                 flow = NULL;
1036                         if (!flow) {
1037                                 error = -ENOENT;
1038                                 goto err_unlock_ovs;
1039                         }
1040                 }
1041                 /* Update actions. */
1042                 old_acts = ovsl_dereference(flow->sf_acts);
1043                 rcu_assign_pointer(flow->sf_acts, acts);
1044
1045                 if (unlikely(reply)) {
1046                         error = ovs_flow_cmd_fill_info(flow,
1047                                                        ovs_header->dp_ifindex,
1048                                                        reply, info->snd_portid,
1049                                                        info->snd_seq, 0,
1050                                                        OVS_FLOW_CMD_NEW,
1051                                                        ufid_flags);
1052                         BUG_ON(error < 0);
1053                 }
1054                 ovs_unlock();
1055
1056                 ovs_nla_free_flow_actions_rcu(old_acts);
1057                 ovs_flow_free(new_flow, false);
1058         }
1059
1060         if (reply)
1061                 ovs_notify(&dp_flow_genl_family, reply, info);
1062         return 0;
1063
1064 err_unlock_ovs:
1065         ovs_unlock();
1066         kfree_skb(reply);
1067 err_kfree_acts:
1068         ovs_nla_free_flow_actions(acts);
1069 err_kfree_flow:
1070         ovs_flow_free(new_flow, false);
1071 error:
1072         return error;
1073 }
1074
1075 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1076 static noinline_for_stack struct sw_flow_actions *get_flow_actions(struct net *net,
1077                                                 const struct nlattr *a,
1078                                                 const struct sw_flow_key *key,
1079                                                 const struct sw_flow_mask *mask,
1080                                                 bool log)
1081 {
1082         struct sw_flow_actions *acts;
1083         struct sw_flow_key masked_key;
1084         int error;
1085
1086         ovs_flow_mask_key(&masked_key, key, true, mask);
1087         error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1088         if (error) {
1089                 OVS_NLERR(log,
1090                           "Actions may not be safe on all matching packets");
1091                 return ERR_PTR(error);
1092         }
1093
1094         return acts;
1095 }
1096
1097 /* Factor out match-init and action-copy to avoid
1098  * "Wframe-larger-than=1024" warning. Because mask is only
1099  * used to get actions, we new a function to save some
1100  * stack space.
1101  *
1102  * If there are not key and action attrs, we return 0
1103  * directly. In the case, the caller will also not use the
1104  * match as before. If there is action attr, we try to get
1105  * actions and save them to *acts. Before returning from
1106  * the function, we reset the match->mask pointer. Because
1107  * we should not to return match object with dangling reference
1108  * to mask.
1109  * */
1110 static noinline_for_stack int
1111 ovs_nla_init_match_and_action(struct net *net,
1112                               struct sw_flow_match *match,
1113                               struct sw_flow_key *key,
1114                               struct nlattr **a,
1115                               struct sw_flow_actions **acts,
1116                               bool log)
1117 {
1118         struct sw_flow_mask mask;
1119         int error = 0;
1120
1121         if (a[OVS_FLOW_ATTR_KEY]) {
1122                 ovs_match_init(match, key, true, &mask);
1123                 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1124                                           a[OVS_FLOW_ATTR_MASK], log);
1125                 if (error)
1126                         goto error;
1127         }
1128
1129         if (a[OVS_FLOW_ATTR_ACTIONS]) {
1130                 if (!a[OVS_FLOW_ATTR_KEY]) {
1131                         OVS_NLERR(log,
1132                                   "Flow key attribute not present in set flow.");
1133                         error = -EINVAL;
1134                         goto error;
1135                 }
1136
1137                 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1138                                          &mask, log);
1139                 if (IS_ERR(*acts)) {
1140                         error = PTR_ERR(*acts);
1141                         goto error;
1142                 }
1143         }
1144
1145         /* On success, error is 0. */
1146 error:
1147         match->mask = NULL;
1148         return error;
1149 }
1150
1151 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1152 {
1153         struct net *net = sock_net(skb->sk);
1154         struct nlattr **a = info->attrs;
1155         struct ovs_header *ovs_header = info->userhdr;
1156         struct sw_flow_key key;
1157         struct sw_flow *flow;
1158         struct sk_buff *reply = NULL;
1159         struct datapath *dp;
1160         struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1161         struct sw_flow_match match;
1162         struct sw_flow_id sfid;
1163         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1164         int error = 0;
1165         bool log = !a[OVS_FLOW_ATTR_PROBE];
1166         bool ufid_present;
1167
1168         ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1169         if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1170                 OVS_NLERR(log,
1171                           "Flow set message rejected, Key attribute missing.");
1172                 return -EINVAL;
1173         }
1174
1175         error = ovs_nla_init_match_and_action(net, &match, &key, a,
1176                                               &acts, log);
1177         if (error)
1178                 goto error;
1179
1180         if (acts) {
1181                 /* Can allocate before locking if have acts. */
1182                 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1183                                                 ufid_flags);
1184                 if (IS_ERR(reply)) {
1185                         error = PTR_ERR(reply);
1186                         goto err_kfree_acts;
1187                 }
1188         }
1189
1190         ovs_lock();
1191         dp = get_dp(net, ovs_header->dp_ifindex);
1192         if (unlikely(!dp)) {
1193                 error = -ENODEV;
1194                 goto err_unlock_ovs;
1195         }
1196         /* Check that the flow exists. */
1197         if (ufid_present)
1198                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1199         else
1200                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1201         if (unlikely(!flow)) {
1202                 error = -ENOENT;
1203                 goto err_unlock_ovs;
1204         }
1205
1206         /* Update actions, if present. */
1207         if (likely(acts)) {
1208                 old_acts = ovsl_dereference(flow->sf_acts);
1209                 rcu_assign_pointer(flow->sf_acts, acts);
1210
1211                 if (unlikely(reply)) {
1212                         error = ovs_flow_cmd_fill_info(flow,
1213                                                        ovs_header->dp_ifindex,
1214                                                        reply, info->snd_portid,
1215                                                        info->snd_seq, 0,
1216                                                        OVS_FLOW_CMD_SET,
1217                                                        ufid_flags);
1218                         BUG_ON(error < 0);
1219                 }
1220         } else {
1221                 /* Could not alloc without acts before locking. */
1222                 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1223                                                 info, OVS_FLOW_CMD_SET, false,
1224                                                 ufid_flags);
1225
1226                 if (IS_ERR(reply)) {
1227                         error = PTR_ERR(reply);
1228                         goto err_unlock_ovs;
1229                 }
1230         }
1231
1232         /* Clear stats. */
1233         if (a[OVS_FLOW_ATTR_CLEAR])
1234                 ovs_flow_stats_clear(flow);
1235         ovs_unlock();
1236
1237         if (reply)
1238                 ovs_notify(&dp_flow_genl_family, reply, info);
1239         if (old_acts)
1240                 ovs_nla_free_flow_actions_rcu(old_acts);
1241
1242         return 0;
1243
1244 err_unlock_ovs:
1245         ovs_unlock();
1246         kfree_skb(reply);
1247 err_kfree_acts:
1248         ovs_nla_free_flow_actions(acts);
1249 error:
1250         return error;
1251 }
1252
1253 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1254 {
1255         struct nlattr **a = info->attrs;
1256         struct ovs_header *ovs_header = info->userhdr;
1257         struct net *net = sock_net(skb->sk);
1258         struct sw_flow_key key;
1259         struct sk_buff *reply;
1260         struct sw_flow *flow;
1261         struct datapath *dp;
1262         struct sw_flow_match match;
1263         struct sw_flow_id ufid;
1264         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1265         int err = 0;
1266         bool log = !a[OVS_FLOW_ATTR_PROBE];
1267         bool ufid_present;
1268
1269         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1270         if (a[OVS_FLOW_ATTR_KEY]) {
1271                 ovs_match_init(&match, &key, true, NULL);
1272                 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1273                                         log);
1274         } else if (!ufid_present) {
1275                 OVS_NLERR(log,
1276                           "Flow get message rejected, Key attribute missing.");
1277                 err = -EINVAL;
1278         }
1279         if (err)
1280                 return err;
1281
1282         ovs_lock();
1283         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1284         if (!dp) {
1285                 err = -ENODEV;
1286                 goto unlock;
1287         }
1288
1289         if (ufid_present)
1290                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1291         else
1292                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1293         if (!flow) {
1294                 err = -ENOENT;
1295                 goto unlock;
1296         }
1297
1298         reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1299                                         OVS_FLOW_CMD_GET, true, ufid_flags);
1300         if (IS_ERR(reply)) {
1301                 err = PTR_ERR(reply);
1302                 goto unlock;
1303         }
1304
1305         ovs_unlock();
1306         return genlmsg_reply(reply, info);
1307 unlock:
1308         ovs_unlock();
1309         return err;
1310 }
1311
1312 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1313 {
1314         struct nlattr **a = info->attrs;
1315         struct ovs_header *ovs_header = info->userhdr;
1316         struct net *net = sock_net(skb->sk);
1317         struct sw_flow_key key;
1318         struct sk_buff *reply;
1319         struct sw_flow *flow = NULL;
1320         struct datapath *dp;
1321         struct sw_flow_match match;
1322         struct sw_flow_id ufid;
1323         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1324         int err;
1325         bool log = !a[OVS_FLOW_ATTR_PROBE];
1326         bool ufid_present;
1327
1328         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1329         if (a[OVS_FLOW_ATTR_KEY]) {
1330                 ovs_match_init(&match, &key, true, NULL);
1331                 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1332                                         NULL, log);
1333                 if (unlikely(err))
1334                         return err;
1335         }
1336
1337         ovs_lock();
1338         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1339         if (unlikely(!dp)) {
1340                 err = -ENODEV;
1341                 goto unlock;
1342         }
1343
1344         if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1345                 err = ovs_flow_tbl_flush(&dp->table);
1346                 goto unlock;
1347         }
1348
1349         if (ufid_present)
1350                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1351         else
1352                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1353         if (unlikely(!flow)) {
1354                 err = -ENOENT;
1355                 goto unlock;
1356         }
1357
1358         ovs_flow_tbl_remove(&dp->table, flow);
1359         ovs_unlock();
1360
1361         reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1362                                         &flow->id, info, false, ufid_flags);
1363         if (likely(reply)) {
1364                 if (!IS_ERR(reply)) {
1365                         rcu_read_lock();        /*To keep RCU checker happy. */
1366                         err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1367                                                      reply, info->snd_portid,
1368                                                      info->snd_seq, 0,
1369                                                      OVS_FLOW_CMD_DEL,
1370                                                      ufid_flags);
1371                         rcu_read_unlock();
1372                         BUG_ON(err < 0);
1373
1374                         ovs_notify(&dp_flow_genl_family, reply, info);
1375                 } else {
1376                         netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1377                 }
1378         }
1379
1380         ovs_flow_free(flow, true);
1381         return 0;
1382 unlock:
1383         ovs_unlock();
1384         return err;
1385 }
1386
1387 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1388 {
1389         struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1390         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1391         struct table_instance *ti;
1392         struct datapath *dp;
1393         u32 ufid_flags;
1394         int err;
1395
1396         err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a,
1397                                        OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1398         if (err)
1399                 return err;
1400         ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1401
1402         rcu_read_lock();
1403         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1404         if (!dp) {
1405                 rcu_read_unlock();
1406                 return -ENODEV;
1407         }
1408
1409         ti = rcu_dereference(dp->table.ti);
1410         for (;;) {
1411                 struct sw_flow *flow;
1412                 u32 bucket, obj;
1413
1414                 bucket = cb->args[0];
1415                 obj = cb->args[1];
1416                 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1417                 if (!flow)
1418                         break;
1419
1420                 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1421                                            NETLINK_CB(cb->skb).portid,
1422                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1423                                            OVS_FLOW_CMD_GET, ufid_flags) < 0)
1424                         break;
1425
1426                 cb->args[0] = bucket;
1427                 cb->args[1] = obj;
1428         }
1429         rcu_read_unlock();
1430         return skb->len;
1431 }
1432
1433 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1434         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1435         [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1436         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1437         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1438         [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1439         [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1440         [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1441 };
1442
1443 static const struct genl_ops dp_flow_genl_ops[] = {
1444         { .cmd = OVS_FLOW_CMD_NEW,
1445           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1446           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1447           .doit = ovs_flow_cmd_new
1448         },
1449         { .cmd = OVS_FLOW_CMD_DEL,
1450           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1451           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1452           .doit = ovs_flow_cmd_del
1453         },
1454         { .cmd = OVS_FLOW_CMD_GET,
1455           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1456           .flags = 0,               /* OK for unprivileged users. */
1457           .doit = ovs_flow_cmd_get,
1458           .dumpit = ovs_flow_cmd_dump
1459         },
1460         { .cmd = OVS_FLOW_CMD_SET,
1461           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1462           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1463           .doit = ovs_flow_cmd_set,
1464         },
1465 };
1466
1467 static struct genl_family dp_flow_genl_family __ro_after_init = {
1468         .hdrsize = sizeof(struct ovs_header),
1469         .name = OVS_FLOW_FAMILY,
1470         .version = OVS_FLOW_VERSION,
1471         .maxattr = OVS_FLOW_ATTR_MAX,
1472         .policy = flow_policy,
1473         .netnsok = true,
1474         .parallel_ops = true,
1475         .ops = dp_flow_genl_ops,
1476         .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1477         .mcgrps = &ovs_dp_flow_multicast_group,
1478         .n_mcgrps = 1,
1479         .module = THIS_MODULE,
1480 };
1481
1482 static size_t ovs_dp_cmd_msg_size(void)
1483 {
1484         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1485
1486         msgsize += nla_total_size(IFNAMSIZ);
1487         msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1488         msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1489         msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1490
1491         return msgsize;
1492 }
1493
1494 /* Called with ovs_mutex. */
1495 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1496                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1497 {
1498         struct ovs_header *ovs_header;
1499         struct ovs_dp_stats dp_stats;
1500         struct ovs_dp_megaflow_stats dp_megaflow_stats;
1501         int err;
1502
1503         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1504                                    flags, cmd);
1505         if (!ovs_header)
1506                 goto error;
1507
1508         ovs_header->dp_ifindex = get_dpifindex(dp);
1509
1510         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1511         if (err)
1512                 goto nla_put_failure;
1513
1514         get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1515         if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1516                           &dp_stats, OVS_DP_ATTR_PAD))
1517                 goto nla_put_failure;
1518
1519         if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1520                           sizeof(struct ovs_dp_megaflow_stats),
1521                           &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1522                 goto nla_put_failure;
1523
1524         if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1525                 goto nla_put_failure;
1526
1527         genlmsg_end(skb, ovs_header);
1528         return 0;
1529
1530 nla_put_failure:
1531         genlmsg_cancel(skb, ovs_header);
1532 error:
1533         return -EMSGSIZE;
1534 }
1535
1536 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1537 {
1538         return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1539 }
1540
1541 /* Called with rcu_read_lock or ovs_mutex. */
1542 static struct datapath *lookup_datapath(struct net *net,
1543                                         const struct ovs_header *ovs_header,
1544                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1545 {
1546         struct datapath *dp;
1547
1548         if (!a[OVS_DP_ATTR_NAME])
1549                 dp = get_dp(net, ovs_header->dp_ifindex);
1550         else {
1551                 struct vport *vport;
1552
1553                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1554                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1555         }
1556         return dp ? dp : ERR_PTR(-ENODEV);
1557 }
1558
1559 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1560 {
1561         struct datapath *dp;
1562
1563         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1564         if (IS_ERR(dp))
1565                 return;
1566
1567         WARN(dp->user_features, "Dropping previously announced user features\n");
1568         dp->user_features = 0;
1569 }
1570
1571 DEFINE_STATIC_KEY_FALSE(tc_recirc_sharing_support);
1572
1573 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1574 {
1575         u32 user_features = 0;
1576
1577         if (a[OVS_DP_ATTR_USER_FEATURES]) {
1578                 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1579
1580                 if (user_features & ~(OVS_DP_F_VPORT_PIDS |
1581                                       OVS_DP_F_UNALIGNED |
1582                                       OVS_DP_F_TC_RECIRC_SHARING))
1583                         return -EOPNOTSUPP;
1584
1585 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1586                 if (user_features & OVS_DP_F_TC_RECIRC_SHARING)
1587                         return -EOPNOTSUPP;
1588 #endif
1589         }
1590
1591         dp->user_features = user_features;
1592
1593         if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING)
1594                 static_branch_enable(&tc_recirc_sharing_support);
1595         else
1596                 static_branch_disable(&tc_recirc_sharing_support);
1597
1598         return 0;
1599 }
1600
1601 static int ovs_dp_stats_init(struct datapath *dp)
1602 {
1603         dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1604         if (!dp->stats_percpu)
1605                 return -ENOMEM;
1606
1607         return 0;
1608 }
1609
1610 static int ovs_dp_vport_init(struct datapath *dp)
1611 {
1612         int i;
1613
1614         dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
1615                                   sizeof(struct hlist_head),
1616                                   GFP_KERNEL);
1617         if (!dp->ports)
1618                 return -ENOMEM;
1619
1620         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1621                 INIT_HLIST_HEAD(&dp->ports[i]);
1622
1623         return 0;
1624 }
1625
1626 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1627 {
1628         struct nlattr **a = info->attrs;
1629         struct vport_parms parms;
1630         struct sk_buff *reply;
1631         struct datapath *dp;
1632         struct vport *vport;
1633         struct ovs_net *ovs_net;
1634         int err;
1635
1636         err = -EINVAL;
1637         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1638                 goto err;
1639
1640         reply = ovs_dp_cmd_alloc_info();
1641         if (!reply)
1642                 return -ENOMEM;
1643
1644         err = -ENOMEM;
1645         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1646         if (dp == NULL)
1647                 goto err_destroy_reply;
1648
1649         ovs_dp_set_net(dp, sock_net(skb->sk));
1650
1651         /* Allocate table. */
1652         err = ovs_flow_tbl_init(&dp->table);
1653         if (err)
1654                 goto err_destroy_dp;
1655
1656         err = ovs_dp_stats_init(dp);
1657         if (err)
1658                 goto err_destroy_table;
1659
1660         err = ovs_dp_vport_init(dp);
1661         if (err)
1662                 goto err_destroy_stats;
1663
1664         err = ovs_meters_init(dp);
1665         if (err)
1666                 goto err_destroy_ports;
1667
1668         /* Set up our datapath device. */
1669         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1670         parms.type = OVS_VPORT_TYPE_INTERNAL;
1671         parms.options = NULL;
1672         parms.dp = dp;
1673         parms.port_no = OVSP_LOCAL;
1674         parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1675
1676         err = ovs_dp_change(dp, a);
1677         if (err)
1678                 goto err_destroy_meters;
1679
1680         /* So far only local changes have been made, now need the lock. */
1681         ovs_lock();
1682
1683         vport = new_vport(&parms);
1684         if (IS_ERR(vport)) {
1685                 err = PTR_ERR(vport);
1686                 if (err == -EBUSY)
1687                         err = -EEXIST;
1688
1689                 if (err == -EEXIST) {
1690                         /* An outdated user space instance that does not understand
1691                          * the concept of user_features has attempted to create a new
1692                          * datapath and is likely to reuse it. Drop all user features.
1693                          */
1694                         if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1695                                 ovs_dp_reset_user_features(skb, info);
1696                 }
1697
1698                 ovs_unlock();
1699                 goto err_destroy_meters;
1700         }
1701
1702         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1703                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1704         BUG_ON(err < 0);
1705
1706         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1707         list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1708
1709         ovs_unlock();
1710
1711         ovs_notify(&dp_datapath_genl_family, reply, info);
1712         return 0;
1713
1714 err_destroy_meters:
1715         ovs_meters_exit(dp);
1716 err_destroy_ports:
1717         kfree(dp->ports);
1718 err_destroy_stats:
1719         free_percpu(dp->stats_percpu);
1720 err_destroy_table:
1721         ovs_flow_tbl_destroy(&dp->table);
1722 err_destroy_dp:
1723         kfree(dp);
1724 err_destroy_reply:
1725         kfree_skb(reply);
1726 err:
1727         return err;
1728 }
1729
1730 /* Called with ovs_mutex. */
1731 static void __dp_destroy(struct datapath *dp)
1732 {
1733         int i;
1734
1735         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1736                 struct vport *vport;
1737                 struct hlist_node *n;
1738
1739                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1740                         if (vport->port_no != OVSP_LOCAL)
1741                                 ovs_dp_detach_port(vport);
1742         }
1743
1744         list_del_rcu(&dp->list_node);
1745
1746         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1747          * all ports in datapath are destroyed first before freeing datapath.
1748          */
1749         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1750
1751         /* RCU destroy the flow table */
1752         call_rcu(&dp->rcu, destroy_dp_rcu);
1753 }
1754
1755 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1756 {
1757         struct sk_buff *reply;
1758         struct datapath *dp;
1759         int err;
1760
1761         reply = ovs_dp_cmd_alloc_info();
1762         if (!reply)
1763                 return -ENOMEM;
1764
1765         ovs_lock();
1766         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1767         err = PTR_ERR(dp);
1768         if (IS_ERR(dp))
1769                 goto err_unlock_free;
1770
1771         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1772                                    info->snd_seq, 0, OVS_DP_CMD_DEL);
1773         BUG_ON(err < 0);
1774
1775         __dp_destroy(dp);
1776         ovs_unlock();
1777
1778         ovs_notify(&dp_datapath_genl_family, reply, info);
1779
1780         return 0;
1781
1782 err_unlock_free:
1783         ovs_unlock();
1784         kfree_skb(reply);
1785         return err;
1786 }
1787
1788 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1789 {
1790         struct sk_buff *reply;
1791         struct datapath *dp;
1792         int err;
1793
1794         reply = ovs_dp_cmd_alloc_info();
1795         if (!reply)
1796                 return -ENOMEM;
1797
1798         ovs_lock();
1799         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1800         err = PTR_ERR(dp);
1801         if (IS_ERR(dp))
1802                 goto err_unlock_free;
1803
1804         err = ovs_dp_change(dp, info->attrs);
1805         if (err)
1806                 goto err_unlock_free;
1807
1808         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1809                                    info->snd_seq, 0, OVS_DP_CMD_SET);
1810         BUG_ON(err < 0);
1811
1812         ovs_unlock();
1813         ovs_notify(&dp_datapath_genl_family, reply, info);
1814
1815         return 0;
1816
1817 err_unlock_free:
1818         ovs_unlock();
1819         kfree_skb(reply);
1820         return err;
1821 }
1822
1823 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1824 {
1825         struct sk_buff *reply;
1826         struct datapath *dp;
1827         int err;
1828
1829         reply = ovs_dp_cmd_alloc_info();
1830         if (!reply)
1831                 return -ENOMEM;
1832
1833         ovs_lock();
1834         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1835         if (IS_ERR(dp)) {
1836                 err = PTR_ERR(dp);
1837                 goto err_unlock_free;
1838         }
1839         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1840                                    info->snd_seq, 0, OVS_DP_CMD_GET);
1841         BUG_ON(err < 0);
1842         ovs_unlock();
1843
1844         return genlmsg_reply(reply, info);
1845
1846 err_unlock_free:
1847         ovs_unlock();
1848         kfree_skb(reply);
1849         return err;
1850 }
1851
1852 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1853 {
1854         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1855         struct datapath *dp;
1856         int skip = cb->args[0];
1857         int i = 0;
1858
1859         ovs_lock();
1860         list_for_each_entry(dp, &ovs_net->dps, list_node) {
1861                 if (i >= skip &&
1862                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1863                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1864                                          OVS_DP_CMD_GET) < 0)
1865                         break;
1866                 i++;
1867         }
1868         ovs_unlock();
1869
1870         cb->args[0] = i;
1871
1872         return skb->len;
1873 }
1874
1875 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1876         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1877         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1878         [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1879 };
1880
1881 static const struct genl_ops dp_datapath_genl_ops[] = {
1882         { .cmd = OVS_DP_CMD_NEW,
1883           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1884           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1885           .doit = ovs_dp_cmd_new
1886         },
1887         { .cmd = OVS_DP_CMD_DEL,
1888           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1889           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1890           .doit = ovs_dp_cmd_del
1891         },
1892         { .cmd = OVS_DP_CMD_GET,
1893           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1894           .flags = 0,               /* OK for unprivileged users. */
1895           .doit = ovs_dp_cmd_get,
1896           .dumpit = ovs_dp_cmd_dump
1897         },
1898         { .cmd = OVS_DP_CMD_SET,
1899           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1900           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1901           .doit = ovs_dp_cmd_set,
1902         },
1903 };
1904
1905 static struct genl_family dp_datapath_genl_family __ro_after_init = {
1906         .hdrsize = sizeof(struct ovs_header),
1907         .name = OVS_DATAPATH_FAMILY,
1908         .version = OVS_DATAPATH_VERSION,
1909         .maxattr = OVS_DP_ATTR_MAX,
1910         .policy = datapath_policy,
1911         .netnsok = true,
1912         .parallel_ops = true,
1913         .ops = dp_datapath_genl_ops,
1914         .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1915         .mcgrps = &ovs_dp_datapath_multicast_group,
1916         .n_mcgrps = 1,
1917         .module = THIS_MODULE,
1918 };
1919
1920 /* Called with ovs_mutex or RCU read lock. */
1921 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1922                                    struct net *net, u32 portid, u32 seq,
1923                                    u32 flags, u8 cmd, gfp_t gfp)
1924 {
1925         struct ovs_header *ovs_header;
1926         struct ovs_vport_stats vport_stats;
1927         int err;
1928
1929         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1930                                  flags, cmd);
1931         if (!ovs_header)
1932                 return -EMSGSIZE;
1933
1934         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1935
1936         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1937             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1938             nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1939                            ovs_vport_name(vport)) ||
1940             nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
1941                 goto nla_put_failure;
1942
1943         if (!net_eq(net, dev_net(vport->dev))) {
1944                 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp);
1945
1946                 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
1947                         goto nla_put_failure;
1948         }
1949
1950         ovs_vport_get_stats(vport, &vport_stats);
1951         if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
1952                           sizeof(struct ovs_vport_stats), &vport_stats,
1953                           OVS_VPORT_ATTR_PAD))
1954                 goto nla_put_failure;
1955
1956         if (ovs_vport_get_upcall_portids(vport, skb))
1957                 goto nla_put_failure;
1958
1959         err = ovs_vport_get_options(vport, skb);
1960         if (err == -EMSGSIZE)
1961                 goto error;
1962
1963         genlmsg_end(skb, ovs_header);
1964         return 0;
1965
1966 nla_put_failure:
1967         err = -EMSGSIZE;
1968 error:
1969         genlmsg_cancel(skb, ovs_header);
1970         return err;
1971 }
1972
1973 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1974 {
1975         return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1976 }
1977
1978 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1979 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
1980                                          u32 portid, u32 seq, u8 cmd)
1981 {
1982         struct sk_buff *skb;
1983         int retval;
1984
1985         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1986         if (!skb)
1987                 return ERR_PTR(-ENOMEM);
1988
1989         retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd,
1990                                          GFP_KERNEL);
1991         BUG_ON(retval < 0);
1992
1993         return skb;
1994 }
1995
1996 /* Called with ovs_mutex or RCU read lock. */
1997 static struct vport *lookup_vport(struct net *net,
1998                                   const struct ovs_header *ovs_header,
1999                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2000 {
2001         struct datapath *dp;
2002         struct vport *vport;
2003
2004         if (a[OVS_VPORT_ATTR_IFINDEX])
2005                 return ERR_PTR(-EOPNOTSUPP);
2006         if (a[OVS_VPORT_ATTR_NAME]) {
2007                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
2008                 if (!vport)
2009                         return ERR_PTR(-ENODEV);
2010                 if (ovs_header->dp_ifindex &&
2011                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
2012                         return ERR_PTR(-ENODEV);
2013                 return vport;
2014         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
2015                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2016
2017                 if (port_no >= DP_MAX_PORTS)
2018                         return ERR_PTR(-EFBIG);
2019
2020                 dp = get_dp(net, ovs_header->dp_ifindex);
2021                 if (!dp)
2022                         return ERR_PTR(-ENODEV);
2023
2024                 vport = ovs_vport_ovsl_rcu(dp, port_no);
2025                 if (!vport)
2026                         return ERR_PTR(-ENODEV);
2027                 return vport;
2028         } else
2029                 return ERR_PTR(-EINVAL);
2030
2031 }
2032
2033 static unsigned int ovs_get_max_headroom(struct datapath *dp)
2034 {
2035         unsigned int dev_headroom, max_headroom = 0;
2036         struct net_device *dev;
2037         struct vport *vport;
2038         int i;
2039
2040         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2041                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2042                         dev = vport->dev;
2043                         dev_headroom = netdev_get_fwd_headroom(dev);
2044                         if (dev_headroom > max_headroom)
2045                                 max_headroom = dev_headroom;
2046                 }
2047         }
2048
2049         return max_headroom;
2050 }
2051
2052 /* Called with ovs_mutex */
2053 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
2054 {
2055         struct vport *vport;
2056         int i;
2057
2058         dp->max_headroom = new_headroom;
2059         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
2060                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
2061                         netdev_set_rx_headroom(vport->dev, new_headroom);
2062 }
2063
2064 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2065 {
2066         struct nlattr **a = info->attrs;
2067         struct ovs_header *ovs_header = info->userhdr;
2068         struct vport_parms parms;
2069         struct sk_buff *reply;
2070         struct vport *vport;
2071         struct datapath *dp;
2072         unsigned int new_headroom;
2073         u32 port_no;
2074         int err;
2075
2076         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2077             !a[OVS_VPORT_ATTR_UPCALL_PID])
2078                 return -EINVAL;
2079         if (a[OVS_VPORT_ATTR_IFINDEX])
2080                 return -EOPNOTSUPP;
2081
2082         port_no = a[OVS_VPORT_ATTR_PORT_NO]
2083                 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2084         if (port_no >= DP_MAX_PORTS)
2085                 return -EFBIG;
2086
2087         reply = ovs_vport_cmd_alloc_info();
2088         if (!reply)
2089                 return -ENOMEM;
2090
2091         ovs_lock();
2092 restart:
2093         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2094         err = -ENODEV;
2095         if (!dp)
2096                 goto exit_unlock_free;
2097
2098         if (port_no) {
2099                 vport = ovs_vport_ovsl(dp, port_no);
2100                 err = -EBUSY;
2101                 if (vport)
2102                         goto exit_unlock_free;
2103         } else {
2104                 for (port_no = 1; ; port_no++) {
2105                         if (port_no >= DP_MAX_PORTS) {
2106                                 err = -EFBIG;
2107                                 goto exit_unlock_free;
2108                         }
2109                         vport = ovs_vport_ovsl(dp, port_no);
2110                         if (!vport)
2111                                 break;
2112                 }
2113         }
2114
2115         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2116         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2117         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2118         parms.dp = dp;
2119         parms.port_no = port_no;
2120         parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2121
2122         vport = new_vport(&parms);
2123         err = PTR_ERR(vport);
2124         if (IS_ERR(vport)) {
2125                 if (err == -EAGAIN)
2126                         goto restart;
2127                 goto exit_unlock_free;
2128         }
2129
2130         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2131                                       info->snd_portid, info->snd_seq, 0,
2132                                       OVS_VPORT_CMD_NEW, GFP_KERNEL);
2133
2134         new_headroom = netdev_get_fwd_headroom(vport->dev);
2135
2136         if (new_headroom > dp->max_headroom)
2137                 ovs_update_headroom(dp, new_headroom);
2138         else
2139                 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2140
2141         BUG_ON(err < 0);
2142         ovs_unlock();
2143
2144         ovs_notify(&dp_vport_genl_family, reply, info);
2145         return 0;
2146
2147 exit_unlock_free:
2148         ovs_unlock();
2149         kfree_skb(reply);
2150         return err;
2151 }
2152
2153 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2154 {
2155         struct nlattr **a = info->attrs;
2156         struct sk_buff *reply;
2157         struct vport *vport;
2158         int err;
2159
2160         reply = ovs_vport_cmd_alloc_info();
2161         if (!reply)
2162                 return -ENOMEM;
2163
2164         ovs_lock();
2165         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2166         err = PTR_ERR(vport);
2167         if (IS_ERR(vport))
2168                 goto exit_unlock_free;
2169
2170         if (a[OVS_VPORT_ATTR_TYPE] &&
2171             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2172                 err = -EINVAL;
2173                 goto exit_unlock_free;
2174         }
2175
2176         if (a[OVS_VPORT_ATTR_OPTIONS]) {
2177                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2178                 if (err)
2179                         goto exit_unlock_free;
2180         }
2181
2182
2183         if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2184                 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2185
2186                 err = ovs_vport_set_upcall_portids(vport, ids);
2187                 if (err)
2188                         goto exit_unlock_free;
2189         }
2190
2191         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2192                                       info->snd_portid, info->snd_seq, 0,
2193                                       OVS_VPORT_CMD_SET, GFP_KERNEL);
2194         BUG_ON(err < 0);
2195
2196         ovs_unlock();
2197         ovs_notify(&dp_vport_genl_family, reply, info);
2198         return 0;
2199
2200 exit_unlock_free:
2201         ovs_unlock();
2202         kfree_skb(reply);
2203         return err;
2204 }
2205
2206 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2207 {
2208         bool update_headroom = false;
2209         struct nlattr **a = info->attrs;
2210         struct sk_buff *reply;
2211         struct datapath *dp;
2212         struct vport *vport;
2213         unsigned int new_headroom;
2214         int err;
2215
2216         reply = ovs_vport_cmd_alloc_info();
2217         if (!reply)
2218                 return -ENOMEM;
2219
2220         ovs_lock();
2221         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2222         err = PTR_ERR(vport);
2223         if (IS_ERR(vport))
2224                 goto exit_unlock_free;
2225
2226         if (vport->port_no == OVSP_LOCAL) {
2227                 err = -EINVAL;
2228                 goto exit_unlock_free;
2229         }
2230
2231         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2232                                       info->snd_portid, info->snd_seq, 0,
2233                                       OVS_VPORT_CMD_DEL, GFP_KERNEL);
2234         BUG_ON(err < 0);
2235
2236         /* the vport deletion may trigger dp headroom update */
2237         dp = vport->dp;
2238         if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2239                 update_headroom = true;
2240
2241         netdev_reset_rx_headroom(vport->dev);
2242         ovs_dp_detach_port(vport);
2243
2244         if (update_headroom) {
2245                 new_headroom = ovs_get_max_headroom(dp);
2246
2247                 if (new_headroom < dp->max_headroom)
2248                         ovs_update_headroom(dp, new_headroom);
2249         }
2250         ovs_unlock();
2251
2252         ovs_notify(&dp_vport_genl_family, reply, info);
2253         return 0;
2254
2255 exit_unlock_free:
2256         ovs_unlock();
2257         kfree_skb(reply);
2258         return err;
2259 }
2260
2261 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2262 {
2263         struct nlattr **a = info->attrs;
2264         struct ovs_header *ovs_header = info->userhdr;
2265         struct sk_buff *reply;
2266         struct vport *vport;
2267         int err;
2268
2269         reply = ovs_vport_cmd_alloc_info();
2270         if (!reply)
2271                 return -ENOMEM;
2272
2273         rcu_read_lock();
2274         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2275         err = PTR_ERR(vport);
2276         if (IS_ERR(vport))
2277                 goto exit_unlock_free;
2278         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2279                                       info->snd_portid, info->snd_seq, 0,
2280                                       OVS_VPORT_CMD_GET, GFP_ATOMIC);
2281         BUG_ON(err < 0);
2282         rcu_read_unlock();
2283
2284         return genlmsg_reply(reply, info);
2285
2286 exit_unlock_free:
2287         rcu_read_unlock();
2288         kfree_skb(reply);
2289         return err;
2290 }
2291
2292 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2293 {
2294         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2295         struct datapath *dp;
2296         int bucket = cb->args[0], skip = cb->args[1];
2297         int i, j = 0;
2298
2299         rcu_read_lock();
2300         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2301         if (!dp) {
2302                 rcu_read_unlock();
2303                 return -ENODEV;
2304         }
2305         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2306                 struct vport *vport;
2307
2308                 j = 0;
2309                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2310                         if (j >= skip &&
2311                             ovs_vport_cmd_fill_info(vport, skb,
2312                                                     sock_net(skb->sk),
2313                                                     NETLINK_CB(cb->skb).portid,
2314                                                     cb->nlh->nlmsg_seq,
2315                                                     NLM_F_MULTI,
2316                                                     OVS_VPORT_CMD_GET,
2317                                                     GFP_ATOMIC) < 0)
2318                                 goto out;
2319
2320                         j++;
2321                 }
2322                 skip = 0;
2323         }
2324 out:
2325         rcu_read_unlock();
2326
2327         cb->args[0] = i;
2328         cb->args[1] = j;
2329
2330         return skb->len;
2331 }
2332
2333 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2334         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2335         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2336         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2337         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2338         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2339         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2340         [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 },
2341         [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2342 };
2343
2344 static const struct genl_ops dp_vport_genl_ops[] = {
2345         { .cmd = OVS_VPORT_CMD_NEW,
2346           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2347           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2348           .doit = ovs_vport_cmd_new
2349         },
2350         { .cmd = OVS_VPORT_CMD_DEL,
2351           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2352           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2353           .doit = ovs_vport_cmd_del
2354         },
2355         { .cmd = OVS_VPORT_CMD_GET,
2356           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2357           .flags = 0,               /* OK for unprivileged users. */
2358           .doit = ovs_vport_cmd_get,
2359           .dumpit = ovs_vport_cmd_dump
2360         },
2361         { .cmd = OVS_VPORT_CMD_SET,
2362           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2363           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2364           .doit = ovs_vport_cmd_set,
2365         },
2366 };
2367
2368 struct genl_family dp_vport_genl_family __ro_after_init = {
2369         .hdrsize = sizeof(struct ovs_header),
2370         .name = OVS_VPORT_FAMILY,
2371         .version = OVS_VPORT_VERSION,
2372         .maxattr = OVS_VPORT_ATTR_MAX,
2373         .policy = vport_policy,
2374         .netnsok = true,
2375         .parallel_ops = true,
2376         .ops = dp_vport_genl_ops,
2377         .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2378         .mcgrps = &ovs_dp_vport_multicast_group,
2379         .n_mcgrps = 1,
2380         .module = THIS_MODULE,
2381 };
2382
2383 static struct genl_family * const dp_genl_families[] = {
2384         &dp_datapath_genl_family,
2385         &dp_vport_genl_family,
2386         &dp_flow_genl_family,
2387         &dp_packet_genl_family,
2388         &dp_meter_genl_family,
2389 #if     IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2390         &dp_ct_limit_genl_family,
2391 #endif
2392 };
2393
2394 static void dp_unregister_genl(int n_families)
2395 {
2396         int i;
2397
2398         for (i = 0; i < n_families; i++)
2399                 genl_unregister_family(dp_genl_families[i]);
2400 }
2401
2402 static int __init dp_register_genl(void)
2403 {
2404         int err;
2405         int i;
2406
2407         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2408
2409                 err = genl_register_family(dp_genl_families[i]);
2410                 if (err)
2411                         goto error;
2412         }
2413
2414         return 0;
2415
2416 error:
2417         dp_unregister_genl(i);
2418         return err;
2419 }
2420
2421 static int __net_init ovs_init_net(struct net *net)
2422 {
2423         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2424
2425         INIT_LIST_HEAD(&ovs_net->dps);
2426         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2427         return ovs_ct_init(net);
2428 }
2429
2430 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2431                                             struct list_head *head)
2432 {
2433         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2434         struct datapath *dp;
2435
2436         list_for_each_entry(dp, &ovs_net->dps, list_node) {
2437                 int i;
2438
2439                 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2440                         struct vport *vport;
2441
2442                         hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2443                                 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2444                                         continue;
2445
2446                                 if (dev_net(vport->dev) == dnet)
2447                                         list_add(&vport->detach_list, head);
2448                         }
2449                 }
2450         }
2451 }
2452
2453 static void __net_exit ovs_exit_net(struct net *dnet)
2454 {
2455         struct datapath *dp, *dp_next;
2456         struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2457         struct vport *vport, *vport_next;
2458         struct net *net;
2459         LIST_HEAD(head);
2460
2461         ovs_ct_exit(dnet);
2462         ovs_lock();
2463         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2464                 __dp_destroy(dp);
2465
2466         down_read(&net_rwsem);
2467         for_each_net(net)
2468                 list_vports_from_net(net, dnet, &head);
2469         up_read(&net_rwsem);
2470
2471         /* Detach all vports from given namespace. */
2472         list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2473                 list_del(&vport->detach_list);
2474                 ovs_dp_detach_port(vport);
2475         }
2476
2477         ovs_unlock();
2478
2479         cancel_work_sync(&ovs_net->dp_notify_work);
2480 }
2481
2482 static struct pernet_operations ovs_net_ops = {
2483         .init = ovs_init_net,
2484         .exit = ovs_exit_net,
2485         .id   = &ovs_net_id,
2486         .size = sizeof(struct ovs_net),
2487 };
2488
2489 static int __init dp_init(void)
2490 {
2491         int err;
2492
2493         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2494
2495         pr_info("Open vSwitch switching datapath\n");
2496
2497         err = action_fifos_init();
2498         if (err)
2499                 goto error;
2500
2501         err = ovs_internal_dev_rtnl_link_register();
2502         if (err)
2503                 goto error_action_fifos_exit;
2504
2505         err = ovs_flow_init();
2506         if (err)
2507                 goto error_unreg_rtnl_link;
2508
2509         err = ovs_vport_init();
2510         if (err)
2511                 goto error_flow_exit;
2512
2513         err = register_pernet_device(&ovs_net_ops);
2514         if (err)
2515                 goto error_vport_exit;
2516
2517         err = register_netdevice_notifier(&ovs_dp_device_notifier);
2518         if (err)
2519                 goto error_netns_exit;
2520
2521         err = ovs_netdev_init();
2522         if (err)
2523                 goto error_unreg_notifier;
2524
2525         err = dp_register_genl();
2526         if (err < 0)
2527                 goto error_unreg_netdev;
2528
2529         return 0;
2530
2531 error_unreg_netdev:
2532         ovs_netdev_exit();
2533 error_unreg_notifier:
2534         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2535 error_netns_exit:
2536         unregister_pernet_device(&ovs_net_ops);
2537 error_vport_exit:
2538         ovs_vport_exit();
2539 error_flow_exit:
2540         ovs_flow_exit();
2541 error_unreg_rtnl_link:
2542         ovs_internal_dev_rtnl_link_unregister();
2543 error_action_fifos_exit:
2544         action_fifos_exit();
2545 error:
2546         return err;
2547 }
2548
2549 static void dp_cleanup(void)
2550 {
2551         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2552         ovs_netdev_exit();
2553         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2554         unregister_pernet_device(&ovs_net_ops);
2555         rcu_barrier();
2556         ovs_vport_exit();
2557         ovs_flow_exit();
2558         ovs_internal_dev_rtnl_link_unregister();
2559         action_fifos_exit();
2560 }
2561
2562 module_init(dp_init);
2563 module_exit(dp_cleanup);
2564
2565 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2566 MODULE_LICENSE("GPL");
2567 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2568 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2569 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2570 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2571 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
2572 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);