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 */
 727         if (sfid && ovs_identifier_is_ufid(sfid))
 728                 len += nla_total_size(sfid->ufid_len);
 729
 730         /* OVS_FLOW_ATTR_KEY */
 731         if (!sfid || should_fill_key(sfid, ufid_flags))
 732                 len += nla_total_size(ovs_key_attr_size());
 733
 734         /* OVS_FLOW_ATTR_MASK */
 735         if (should_fill_mask(ufid_flags))
 736                 len += nla_total_size(ovs_key_attr_size());
 737
 738         /* OVS_FLOW_ATTR_ACTIONS */
 739         if (should_fill_actions(ufid_flags))
 740                 len += nla_total_size(acts->orig_len);
 741
 742         return len
 743                 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
 744                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
 745                 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
 746 }
 747
 748 /* Called with ovs_mutex or RCU read lock. */
 749 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
 750                                    struct sk_buff *skb)
 751 {
 752         struct ovs_flow_stats stats;
 753         __be16 tcp_flags;
 754         unsigned long used;
 755
 756         ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
 757
 758         if (used &&
 759             nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
 760                               OVS_FLOW_ATTR_PAD))
 761                 return -EMSGSIZE;
 762
 763         if (stats.n_packets &&
 764             nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
 765                           sizeof(struct ovs_flow_stats), &stats,
 766                           OVS_FLOW_ATTR_PAD))
 767                 return -EMSGSIZE;
 768
 769         if ((u8)ntohs(tcp_flags) &&
 770              nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
 771                 return -EMSGSIZE;
 772
 773         return 0;
 774 }
 775
 776 /* Called with ovs_mutex or RCU read lock. */
 777 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
 778                                      struct sk_buff *skb, int skb_orig_len)
 779 {
 780         struct nlattr *start;
 781         int err;
 782
 783         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 784          * this is the first flow to be dumped into 'skb'.  This is unusual for
 785          * Netlink but individual action lists can be longer than
 786          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 787          * The userspace caller can always fetch the actions separately if it
 788          * really wants them.  (Most userspace callers in fact don't care.)
 789          *
 790          * This can only fail for dump operations because the skb is always
 791          * properly sized for single flows.
 792          */
 793         start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS);
 794         if (start) {
 795                 const struct sw_flow_actions *sf_acts;
 796
 797                 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
 798                 err = ovs_nla_put_actions(sf_acts->actions,
 799                                           sf_acts->actions_len, skb);
 800
 801                 if (!err)
 802                         nla_nest_end(skb, start);
 803                 else {
 804                         if (skb_orig_len)
 805                                 return err;
 806
 807                         nla_nest_cancel(skb, start);
 808                 }
 809         } else if (skb_orig_len) {
 810                 return -EMSGSIZE;
 811         }
 812
 813         return 0;
 814 }
 815
 816 /* Called with ovs_mutex or RCU read lock. */
 817 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
 818                                   struct sk_buff *skb, u32 portid,
 819                                   u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
 820 {
 821         const int skb_orig_len = skb->len;
 822         struct ovs_header *ovs_header;
 823         int err;
 824
 825         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
 826                                  flags, cmd);
 827         if (!ovs_header)
 828                 return -EMSGSIZE;
 829
 830         ovs_header->dp_ifindex = dp_ifindex;
 831
 832         err = ovs_nla_put_identifier(flow, skb);
 833         if (err)
 834                 goto error;
 835
 836         if (should_fill_key(&flow->id, ufid_flags)) {
 837                 err = ovs_nla_put_masked_key(flow, skb);
 838                 if (err)
 839                         goto error;
 840         }
 841
 842         if (should_fill_mask(ufid_flags)) {
 843                 err = ovs_nla_put_mask(flow, skb);
 844                 if (err)
 845                         goto error;
 846         }
 847
 848         err = ovs_flow_cmd_fill_stats(flow, skb);
 849         if (err)
 850                 goto error;
 851
 852         if (should_fill_actions(ufid_flags)) {
 853                 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
 854                 if (err)
 855                         goto error;
 856         }
 857
 858         genlmsg_end(skb, ovs_header);
 859         return 0;
 860
 861 error:
 862         genlmsg_cancel(skb, ovs_header);
 863         return err;
 864 }
 865
 866 /* May not be called with RCU read lock. */
 867 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
 868                                                const struct sw_flow_id *sfid,
 869                                                struct genl_info *info,
 870                                                bool always,
 871                                                uint32_t ufid_flags)
 872 {
 873         struct sk_buff *skb;
 874         size_t len;
 875
 876         if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
 877                 return NULL;
 878
 879         len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
 880         skb = genlmsg_new(len, GFP_KERNEL);
 881         if (!skb)
 882                 return ERR_PTR(-ENOMEM);
 883
 884         return skb;
 885 }
 886
 887 /* Called with ovs_mutex. */
 888 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
 889                                                int dp_ifindex,
 890                                                struct genl_info *info, u8 cmd,
 891                                                bool always, u32 ufid_flags)
 892 {
 893         struct sk_buff *skb;
 894         int retval;
 895
 896         skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
 897                                       &flow->id, info, always, ufid_flags);
 898         if (IS_ERR_OR_NULL(skb))
 899                 return skb;
 900
 901         retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
 902                                         info->snd_portid, info->snd_seq, 0,
 903                                         cmd, ufid_flags);
 904         BUG_ON(retval < 0);
 905         return skb;
 906 }
 907
 908 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
 909 {
 910         struct net *net = sock_net(skb->sk);
 911         struct nlattr **a = info->attrs;
 912         struct ovs_header *ovs_header = info->userhdr;
 913         struct sw_flow *flow = NULL, *new_flow;
 914         struct sw_flow_mask mask;
 915         struct sk_buff *reply;
 916         struct datapath *dp;
 917         struct sw_flow_actions *acts;
 918         struct sw_flow_match match;
 919         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
 920         int error;
 921         bool log = !a[OVS_FLOW_ATTR_PROBE];
 922
 923         /* Must have key and actions. */
 924         error = -EINVAL;
 925         if (!a[OVS_FLOW_ATTR_KEY]) {
 926                 OVS_NLERR(log, "Flow key attr not present in new flow.");
 927                 goto error;
 928         }
 929         if (!a[OVS_FLOW_ATTR_ACTIONS]) {
 930                 OVS_NLERR(log, "Flow actions attr not present in new flow.");
 931                 goto error;
 932         }
 933
 934         /* Most of the time we need to allocate a new flow, do it before
 935          * locking.
 936          */
 937         new_flow = ovs_flow_alloc();
 938         if (IS_ERR(new_flow)) {
 939                 error = PTR_ERR(new_flow);
 940                 goto error;
 941         }
 942
 943         /* Extract key. */
 944         ovs_match_init(&match, &new_flow->key, false, &mask);
 945         error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
 946                                   a[OVS_FLOW_ATTR_MASK], log);
 947         if (error)
 948                 goto err_kfree_flow;
 949
 950         /* Extract flow identifier. */
 951         error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
 952                                        &new_flow->key, log);
 953         if (error)
 954                 goto err_kfree_flow;
 955
 956         /* unmasked key is needed to match when ufid is not used. */
 957         if (ovs_identifier_is_key(&new_flow->id))
 958                 match.key = new_flow->id.unmasked_key;
 959
 960         ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
 961
 962         /* Validate actions. */
 963         error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
 964                                      &new_flow->key, &acts, log);
 965         if (error) {
 966                 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
 967                 goto err_kfree_flow;
 968         }
 969
 970         reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
 971                                         ufid_flags);
 972         if (IS_ERR(reply)) {
 973                 error = PTR_ERR(reply);
 974                 goto err_kfree_acts;
 975         }
 976
 977         ovs_lock();
 978         dp = get_dp(net, ovs_header->dp_ifindex);
 979         if (unlikely(!dp)) {
 980                 error = -ENODEV;
 981                 goto err_unlock_ovs;
 982         }
 983
 984         /* Check if this is a duplicate flow */
 985         if (ovs_identifier_is_ufid(&new_flow->id))
 986                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
 987         if (!flow)
 988                 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
 989         if (likely(!flow)) {
 990                 rcu_assign_pointer(new_flow->sf_acts, acts);
 991
 992                 /* Put flow in bucket. */
 993                 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
 994                 if (unlikely(error)) {
 995                         acts = NULL;
 996                         goto err_unlock_ovs;
 997                 }
 998
 999                 if (unlikely(reply)) {
1000                         error = ovs_flow_cmd_fill_info(new_flow,
1001                                                        ovs_header->dp_ifindex,
1002                                                        reply, info->snd_portid,
1003                                                        info->snd_seq, 0,
1004                                                        OVS_FLOW_CMD_NEW,
1005                                                        ufid_flags);
1006                         BUG_ON(error < 0);
1007                 }
1008                 ovs_unlock();
1009         } else {
1010                 struct sw_flow_actions *old_acts;
1011
1012                 /* Bail out if we're not allowed to modify an existing flow.
1013                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1014                  * because Generic Netlink treats the latter as a dump
1015                  * request.  We also accept NLM_F_EXCL in case that bug ever
1016                  * gets fixed.
1017                  */
1018                 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1019                                                          | NLM_F_EXCL))) {
1020                         error = -EEXIST;
1021                         goto err_unlock_ovs;
1022                 }
1023                 /* The flow identifier has to be the same for flow updates.
1024                  * Look for any overlapping flow.
1025                  */
1026                 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1027                         if (ovs_identifier_is_key(&flow->id))
1028                                 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1029                                                                  &match);
1030                         else /* UFID matches but key is different */
1031                                 flow = NULL;
1032                         if (!flow) {
1033                                 error = -ENOENT;
1034                                 goto err_unlock_ovs;
1035                         }
1036                 }
1037                 /* Update actions. */
1038                 old_acts = ovsl_dereference(flow->sf_acts);
1039                 rcu_assign_pointer(flow->sf_acts, acts);
1040
1041                 if (unlikely(reply)) {
1042                         error = ovs_flow_cmd_fill_info(flow,
1043                                                        ovs_header->dp_ifindex,
1044                                                        reply, info->snd_portid,
1045                                                        info->snd_seq, 0,
1046                                                        OVS_FLOW_CMD_NEW,
1047                                                        ufid_flags);
1048                         BUG_ON(error < 0);
1049                 }
1050                 ovs_unlock();
1051
1052                 ovs_nla_free_flow_actions_rcu(old_acts);
1053                 ovs_flow_free(new_flow, false);
1054         }
1055
1056         if (reply)
1057                 ovs_notify(&dp_flow_genl_family, reply, info);
1058         return 0;
1059
1060 err_unlock_ovs:
1061         ovs_unlock();
1062         kfree_skb(reply);
1063 err_kfree_acts:
1064         ovs_nla_free_flow_actions(acts);
1065 err_kfree_flow:
1066         ovs_flow_free(new_flow, false);
1067 error:
1068         return error;
1069 }
1070
1071 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1072 static noinline_for_stack struct sw_flow_actions *get_flow_actions(struct net *net,
1073                                                 const struct nlattr *a,
1074                                                 const struct sw_flow_key *key,
1075                                                 const struct sw_flow_mask *mask,
1076                                                 bool log)
1077 {
1078         struct sw_flow_actions *acts;
1079         struct sw_flow_key masked_key;
1080         int error;
1081
1082         ovs_flow_mask_key(&masked_key, key, true, mask);
1083         error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1084         if (error) {
1085                 OVS_NLERR(log,
1086                           "Actions may not be safe on all matching packets");
1087                 return ERR_PTR(error);
1088         }
1089
1090         return acts;
1091 }
1092
1093 /* Factor out match-init and action-copy to avoid
1094  * "Wframe-larger-than=1024" warning. Because mask is only
1095  * used to get actions, we new a function to save some
1096  * stack space.
1097  *
1098  * If there are not key and action attrs, we return 0
1099  * directly. In the case, the caller will also not use the
1100  * match as before. If there is action attr, we try to get
1101  * actions and save them to *acts. Before returning from
1102  * the function, we reset the match->mask pointer. Because
1103  * we should not to return match object with dangling reference
1104  * to mask.
1105  * */
1106 static noinline_for_stack int
1107 ovs_nla_init_match_and_action(struct net *net,
1108                               struct sw_flow_match *match,
1109                               struct sw_flow_key *key,
1110                               struct nlattr **a,
1111                               struct sw_flow_actions **acts,
1112                               bool log)
1113 {
1114         struct sw_flow_mask mask;
1115         int error = 0;
1116
1117         if (a[OVS_FLOW_ATTR_KEY]) {
1118                 ovs_match_init(match, key, true, &mask);
1119                 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1120                                           a[OVS_FLOW_ATTR_MASK], log);
1121                 if (error)
1122                         goto error;
1123         }
1124
1125         if (a[OVS_FLOW_ATTR_ACTIONS]) {
1126                 if (!a[OVS_FLOW_ATTR_KEY]) {
1127                         OVS_NLERR(log,
1128                                   "Flow key attribute not present in set flow.");
1129                         error = -EINVAL;
1130                         goto error;
1131                 }
1132
1133                 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1134                                          &mask, log);
1135                 if (IS_ERR(*acts)) {
1136                         error = PTR_ERR(*acts);
1137                         goto error;
1138                 }
1139         }
1140
1141         /* On success, error is 0. */
1142 error:
1143         match->mask = NULL;
1144         return error;
1145 }
1146
1147 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1148 {
1149         struct net *net = sock_net(skb->sk);
1150         struct nlattr **a = info->attrs;
1151         struct ovs_header *ovs_header = info->userhdr;
1152         struct sw_flow_key key;
1153         struct sw_flow *flow;
1154         struct sk_buff *reply = NULL;
1155         struct datapath *dp;
1156         struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1157         struct sw_flow_match match;
1158         struct sw_flow_id sfid;
1159         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1160         int error = 0;
1161         bool log = !a[OVS_FLOW_ATTR_PROBE];
1162         bool ufid_present;
1163
1164         ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1165         if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1166                 OVS_NLERR(log,
1167                           "Flow set message rejected, Key attribute missing.");
1168                 return -EINVAL;
1169         }
1170
1171         error = ovs_nla_init_match_and_action(net, &match, &key, a,
1172                                               &acts, log);
1173         if (error)
1174                 goto error;
1175
1176         if (acts) {
1177                 /* Can allocate before locking if have acts. */
1178                 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1179                                                 ufid_flags);
1180                 if (IS_ERR(reply)) {
1181                         error = PTR_ERR(reply);
1182                         goto err_kfree_acts;
1183                 }
1184         }
1185
1186         ovs_lock();
1187         dp = get_dp(net, ovs_header->dp_ifindex);
1188         if (unlikely(!dp)) {
1189                 error = -ENODEV;
1190                 goto err_unlock_ovs;
1191         }
1192         /* Check that the flow exists. */
1193         if (ufid_present)
1194                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1195         else
1196                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1197         if (unlikely(!flow)) {
1198                 error = -ENOENT;
1199                 goto err_unlock_ovs;
1200         }
1201
1202         /* Update actions, if present. */
1203         if (likely(acts)) {
1204                 old_acts = ovsl_dereference(flow->sf_acts);
1205                 rcu_assign_pointer(flow->sf_acts, acts);
1206
1207                 if (unlikely(reply)) {
1208                         error = ovs_flow_cmd_fill_info(flow,
1209                                                        ovs_header->dp_ifindex,
1210                                                        reply, info->snd_portid,
1211                                                        info->snd_seq, 0,
1212                                                        OVS_FLOW_CMD_SET,
1213                                                        ufid_flags);
1214                         BUG_ON(error < 0);
1215                 }
1216         } else {
1217                 /* Could not alloc without acts before locking. */
1218                 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1219                                                 info, OVS_FLOW_CMD_SET, false,
1220                                                 ufid_flags);
1221
1222                 if (IS_ERR(reply)) {
1223                         error = PTR_ERR(reply);
1224                         goto err_unlock_ovs;
1225                 }
1226         }
1227
1228         /* Clear stats. */
1229         if (a[OVS_FLOW_ATTR_CLEAR])
1230                 ovs_flow_stats_clear(flow);
1231         ovs_unlock();
1232
1233         if (reply)
1234                 ovs_notify(&dp_flow_genl_family, reply, info);
1235         if (old_acts)
1236                 ovs_nla_free_flow_actions_rcu(old_acts);
1237
1238         return 0;
1239
1240 err_unlock_ovs:
1241         ovs_unlock();
1242         kfree_skb(reply);
1243 err_kfree_acts:
1244         ovs_nla_free_flow_actions(acts);
1245 error:
1246         return error;
1247 }
1248
1249 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1250 {
1251         struct nlattr **a = info->attrs;
1252         struct ovs_header *ovs_header = info->userhdr;
1253         struct net *net = sock_net(skb->sk);
1254         struct sw_flow_key key;
1255         struct sk_buff *reply;
1256         struct sw_flow *flow;
1257         struct datapath *dp;
1258         struct sw_flow_match match;
1259         struct sw_flow_id ufid;
1260         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1261         int err = 0;
1262         bool log = !a[OVS_FLOW_ATTR_PROBE];
1263         bool ufid_present;
1264
1265         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1266         if (a[OVS_FLOW_ATTR_KEY]) {
1267                 ovs_match_init(&match, &key, true, NULL);
1268                 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1269                                         log);
1270         } else if (!ufid_present) {
1271                 OVS_NLERR(log,
1272                           "Flow get message rejected, Key attribute missing.");
1273                 err = -EINVAL;
1274         }
1275         if (err)
1276                 return err;
1277
1278         ovs_lock();
1279         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1280         if (!dp) {
1281                 err = -ENODEV;
1282                 goto unlock;
1283         }
1284
1285         if (ufid_present)
1286                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1287         else
1288                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1289         if (!flow) {
1290                 err = -ENOENT;
1291                 goto unlock;
1292         }
1293
1294         reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1295                                         OVS_FLOW_CMD_GET, true, ufid_flags);
1296         if (IS_ERR(reply)) {
1297                 err = PTR_ERR(reply);
1298                 goto unlock;
1299         }
1300
1301         ovs_unlock();
1302         return genlmsg_reply(reply, info);
1303 unlock:
1304         ovs_unlock();
1305         return err;
1306 }
1307
1308 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1309 {
1310         struct nlattr **a = info->attrs;
1311         struct ovs_header *ovs_header = info->userhdr;
1312         struct net *net = sock_net(skb->sk);
1313         struct sw_flow_key key;
1314         struct sk_buff *reply;
1315         struct sw_flow *flow = NULL;
1316         struct datapath *dp;
1317         struct sw_flow_match match;
1318         struct sw_flow_id ufid;
1319         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1320         int err;
1321         bool log = !a[OVS_FLOW_ATTR_PROBE];
1322         bool ufid_present;
1323
1324         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1325         if (a[OVS_FLOW_ATTR_KEY]) {
1326                 ovs_match_init(&match, &key, true, NULL);
1327                 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1328                                         NULL, log);
1329                 if (unlikely(err))
1330                         return err;
1331         }
1332
1333         ovs_lock();
1334         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1335         if (unlikely(!dp)) {
1336                 err = -ENODEV;
1337                 goto unlock;
1338         }
1339
1340         if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1341                 err = ovs_flow_tbl_flush(&dp->table);
1342                 goto unlock;
1343         }
1344
1345         if (ufid_present)
1346                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1347         else
1348                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1349         if (unlikely(!flow)) {
1350                 err = -ENOENT;
1351                 goto unlock;
1352         }
1353
1354         ovs_flow_tbl_remove(&dp->table, flow);
1355         ovs_unlock();
1356
1357         reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1358                                         &flow->id, info, false, ufid_flags);
1359         if (likely(reply)) {
1360                 if (!IS_ERR(reply)) {
1361                         rcu_read_lock();        /*To keep RCU checker happy. */
1362                         err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1363                                                      reply, info->snd_portid,
1364                                                      info->snd_seq, 0,
1365                                                      OVS_FLOW_CMD_DEL,
1366                                                      ufid_flags);
1367                         rcu_read_unlock();
1368                         BUG_ON(err < 0);
1369
1370                         ovs_notify(&dp_flow_genl_family, reply, info);
1371                 } else {
1372                         netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1373                 }
1374         }
1375
1376         ovs_flow_free(flow, true);
1377         return 0;
1378 unlock:
1379         ovs_unlock();
1380         return err;
1381 }
1382
1383 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1384 {
1385         struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1386         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1387         struct table_instance *ti;
1388         struct datapath *dp;
1389         u32 ufid_flags;
1390         int err;
1391
1392         err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a,
1393                                        OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1394         if (err)
1395                 return err;
1396         ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1397
1398         rcu_read_lock();
1399         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1400         if (!dp) {
1401                 rcu_read_unlock();
1402                 return -ENODEV;
1403         }
1404
1405         ti = rcu_dereference(dp->table.ti);
1406         for (;;) {
1407                 struct sw_flow *flow;
1408                 u32 bucket, obj;
1409
1410                 bucket = cb->args[0];
1411                 obj = cb->args[1];
1412                 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1413                 if (!flow)
1414                         break;
1415
1416                 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1417                                            NETLINK_CB(cb->skb).portid,
1418                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1419                                            OVS_FLOW_CMD_GET, ufid_flags) < 0)
1420                         break;
1421
1422                 cb->args[0] = bucket;
1423                 cb->args[1] = obj;
1424         }
1425         rcu_read_unlock();
1426         return skb->len;
1427 }
1428
1429 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1430         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1431         [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1432         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1433         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1434         [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1435         [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1436         [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1437 };
1438
1439 static const struct genl_ops dp_flow_genl_ops[] = {
1440         { .cmd = OVS_FLOW_CMD_NEW,
1441           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1442           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1443           .doit = ovs_flow_cmd_new
1444         },
1445         { .cmd = OVS_FLOW_CMD_DEL,
1446           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1447           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1448           .doit = ovs_flow_cmd_del
1449         },
1450         { .cmd = OVS_FLOW_CMD_GET,
1451           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1452           .flags = 0,               /* OK for unprivileged users. */
1453           .doit = ovs_flow_cmd_get,
1454           .dumpit = ovs_flow_cmd_dump
1455         },
1456         { .cmd = OVS_FLOW_CMD_SET,
1457           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1458           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1459           .doit = ovs_flow_cmd_set,
1460         },
1461 };
1462
1463 static struct genl_family dp_flow_genl_family __ro_after_init = {
1464         .hdrsize = sizeof(struct ovs_header),
1465         .name = OVS_FLOW_FAMILY,
1466         .version = OVS_FLOW_VERSION,
1467         .maxattr = OVS_FLOW_ATTR_MAX,
1468         .policy = flow_policy,
1469         .netnsok = true,
1470         .parallel_ops = true,
1471         .ops = dp_flow_genl_ops,
1472         .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1473         .mcgrps = &ovs_dp_flow_multicast_group,
1474         .n_mcgrps = 1,
1475         .module = THIS_MODULE,
1476 };
1477
1478 static size_t ovs_dp_cmd_msg_size(void)
1479 {
1480         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1481
1482         msgsize += nla_total_size(IFNAMSIZ);
1483         msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1484         msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1485         msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1486
1487         return msgsize;
1488 }
1489
1490 /* Called with ovs_mutex. */
1491 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1492                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1493 {
1494         struct ovs_header *ovs_header;
1495         struct ovs_dp_stats dp_stats;
1496         struct ovs_dp_megaflow_stats dp_megaflow_stats;
1497         int err;
1498
1499         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1500                                    flags, cmd);
1501         if (!ovs_header)
1502                 goto error;
1503
1504         ovs_header->dp_ifindex = get_dpifindex(dp);
1505
1506         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1507         if (err)
1508                 goto nla_put_failure;
1509
1510         get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1511         if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1512                           &dp_stats, OVS_DP_ATTR_PAD))
1513                 goto nla_put_failure;
1514
1515         if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1516                           sizeof(struct ovs_dp_megaflow_stats),
1517                           &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1518                 goto nla_put_failure;
1519
1520         if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1521                 goto nla_put_failure;
1522
1523         genlmsg_end(skb, ovs_header);
1524         return 0;
1525
1526 nla_put_failure:
1527         genlmsg_cancel(skb, ovs_header);
1528 error:
1529         return -EMSGSIZE;
1530 }
1531
1532 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1533 {
1534         return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1535 }
1536
1537 /* Called with rcu_read_lock or ovs_mutex. */
1538 static struct datapath *lookup_datapath(struct net *net,
1539                                         const struct ovs_header *ovs_header,
1540                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1541 {
1542         struct datapath *dp;
1543
1544         if (!a[OVS_DP_ATTR_NAME])
1545                 dp = get_dp(net, ovs_header->dp_ifindex);
1546         else {
1547                 struct vport *vport;
1548
1549                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1550                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1551         }
1552         return dp ? dp : ERR_PTR(-ENODEV);
1553 }
1554
1555 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1556 {
1557         struct datapath *dp;
1558
1559         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1560         if (IS_ERR(dp))
1561                 return;
1562
1563         WARN(dp->user_features, "Dropping previously announced user features\n");
1564         dp->user_features = 0;
1565 }
1566
1567 DEFINE_STATIC_KEY_FALSE(tc_recirc_sharing_support);
1568
1569 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1570 {
1571         u32 user_features = 0;
1572
1573         if (a[OVS_DP_ATTR_USER_FEATURES]) {
1574                 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1575
1576                 if (user_features & ~(OVS_DP_F_VPORT_PIDS |
1577                                       OVS_DP_F_UNALIGNED |
1578                                       OVS_DP_F_TC_RECIRC_SHARING))
1579                         return -EOPNOTSUPP;
1580
1581 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1582                 if (user_features & OVS_DP_F_TC_RECIRC_SHARING)
1583                         return -EOPNOTSUPP;
1584 #endif
1585         }
1586
1587         dp->user_features = user_features;
1588
1589         if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING)
1590                 static_branch_enable(&tc_recirc_sharing_support);
1591         else
1592                 static_branch_disable(&tc_recirc_sharing_support);
1593
1594         return 0;
1595 }
1596
1597 static int ovs_dp_stats_init(struct datapath *dp)
1598 {
1599         dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1600         if (!dp->stats_percpu)
1601                 return -ENOMEM;
1602
1603         return 0;
1604 }
1605
1606 static int ovs_dp_vport_init(struct datapath *dp)
1607 {
1608         int i;
1609
1610         dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
1611                                   sizeof(struct hlist_head),
1612                                   GFP_KERNEL);
1613         if (!dp->ports)
1614                 return -ENOMEM;
1615
1616         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1617                 INIT_HLIST_HEAD(&dp->ports[i]);
1618
1619         return 0;
1620 }
1621
1622 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1623 {
1624         struct nlattr **a = info->attrs;
1625         struct vport_parms parms;
1626         struct sk_buff *reply;
1627         struct datapath *dp;
1628         struct vport *vport;
1629         struct ovs_net *ovs_net;
1630         int err;
1631
1632         err = -EINVAL;
1633         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1634                 goto err;
1635
1636         reply = ovs_dp_cmd_alloc_info();
1637         if (!reply)
1638                 return -ENOMEM;
1639
1640         err = -ENOMEM;
1641         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1642         if (dp == NULL)
1643                 goto err_destroy_reply;
1644
1645         ovs_dp_set_net(dp, sock_net(skb->sk));
1646
1647         /* Allocate table. */
1648         err = ovs_flow_tbl_init(&dp->table);
1649         if (err)
1650                 goto err_destroy_dp;
1651
1652         err = ovs_dp_stats_init(dp);
1653         if (err)
1654                 goto err_destroy_table;
1655
1656         err = ovs_dp_vport_init(dp);
1657         if (err)
1658                 goto err_destroy_stats;
1659
1660         err = ovs_meters_init(dp);
1661         if (err)
1662                 goto err_destroy_ports;
1663
1664         /* Set up our datapath device. */
1665         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1666         parms.type = OVS_VPORT_TYPE_INTERNAL;
1667         parms.options = NULL;
1668         parms.dp = dp;
1669         parms.port_no = OVSP_LOCAL;
1670         parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1671
1672         err = ovs_dp_change(dp, a);
1673         if (err)
1674                 goto err_destroy_meters;
1675
1676         /* So far only local changes have been made, now need the lock. */
1677         ovs_lock();
1678
1679         vport = new_vport(&parms);
1680         if (IS_ERR(vport)) {
1681                 err = PTR_ERR(vport);
1682                 if (err == -EBUSY)
1683                         err = -EEXIST;
1684
1685                 if (err == -EEXIST) {
1686                         /* An outdated user space instance that does not understand
1687                          * the concept of user_features has attempted to create a new
1688                          * datapath and is likely to reuse it. Drop all user features.
1689                          */
1690                         if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1691                                 ovs_dp_reset_user_features(skb, info);
1692                 }
1693
1694                 ovs_unlock();
1695                 goto err_destroy_meters;
1696         }
1697
1698         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1699                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1700         BUG_ON(err < 0);
1701
1702         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1703         list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1704
1705         ovs_unlock();
1706
1707         ovs_notify(&dp_datapath_genl_family, reply, info);
1708         return 0;
1709
1710 err_destroy_meters:
1711         ovs_meters_exit(dp);
1712 err_destroy_ports:
1713         kfree(dp->ports);
1714 err_destroy_stats:
1715         free_percpu(dp->stats_percpu);
1716 err_destroy_table:
1717         ovs_flow_tbl_destroy(&dp->table);
1718 err_destroy_dp:
1719         kfree(dp);
1720 err_destroy_reply:
1721         kfree_skb(reply);
1722 err:
1723         return err;
1724 }
1725
1726 /* Called with ovs_mutex. */
1727 static void __dp_destroy(struct datapath *dp)
1728 {
1729         int i;
1730
1731         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1732                 struct vport *vport;
1733                 struct hlist_node *n;
1734
1735                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1736                         if (vport->port_no != OVSP_LOCAL)
1737                                 ovs_dp_detach_port(vport);
1738         }
1739
1740         list_del_rcu(&dp->list_node);
1741
1742         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1743          * all ports in datapath are destroyed first before freeing datapath.
1744          */
1745         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1746
1747         /* RCU destroy the flow table */
1748         call_rcu(&dp->rcu, destroy_dp_rcu);
1749 }
1750
1751 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1752 {
1753         struct sk_buff *reply;
1754         struct datapath *dp;
1755         int err;
1756
1757         reply = ovs_dp_cmd_alloc_info();
1758         if (!reply)
1759                 return -ENOMEM;
1760
1761         ovs_lock();
1762         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1763         err = PTR_ERR(dp);
1764         if (IS_ERR(dp))
1765                 goto err_unlock_free;
1766
1767         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1768                                    info->snd_seq, 0, OVS_DP_CMD_DEL);
1769         BUG_ON(err < 0);
1770
1771         __dp_destroy(dp);
1772         ovs_unlock();
1773
1774         ovs_notify(&dp_datapath_genl_family, reply, info);
1775
1776         return 0;
1777
1778 err_unlock_free:
1779         ovs_unlock();
1780         kfree_skb(reply);
1781         return err;
1782 }
1783
1784 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1785 {
1786         struct sk_buff *reply;
1787         struct datapath *dp;
1788         int err;
1789
1790         reply = ovs_dp_cmd_alloc_info();
1791         if (!reply)
1792                 return -ENOMEM;
1793
1794         ovs_lock();
1795         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1796         err = PTR_ERR(dp);
1797         if (IS_ERR(dp))
1798                 goto err_unlock_free;
1799
1800         err = ovs_dp_change(dp, info->attrs);
1801         if (err)
1802                 goto err_unlock_free;
1803
1804         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1805                                    info->snd_seq, 0, OVS_DP_CMD_SET);
1806         BUG_ON(err < 0);
1807
1808         ovs_unlock();
1809         ovs_notify(&dp_datapath_genl_family, reply, info);
1810
1811         return 0;
1812
1813 err_unlock_free:
1814         ovs_unlock();
1815         kfree_skb(reply);
1816         return err;
1817 }
1818
1819 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1820 {
1821         struct sk_buff *reply;
1822         struct datapath *dp;
1823         int err;
1824
1825         reply = ovs_dp_cmd_alloc_info();
1826         if (!reply)
1827                 return -ENOMEM;
1828
1829         ovs_lock();
1830         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1831         if (IS_ERR(dp)) {
1832                 err = PTR_ERR(dp);
1833                 goto err_unlock_free;
1834         }
1835         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1836                                    info->snd_seq, 0, OVS_DP_CMD_GET);
1837         BUG_ON(err < 0);
1838         ovs_unlock();
1839
1840         return genlmsg_reply(reply, info);
1841
1842 err_unlock_free:
1843         ovs_unlock();
1844         kfree_skb(reply);
1845         return err;
1846 }
1847
1848 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1849 {
1850         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1851         struct datapath *dp;
1852         int skip = cb->args[0];
1853         int i = 0;
1854
1855         ovs_lock();
1856         list_for_each_entry(dp, &ovs_net->dps, list_node) {
1857                 if (i >= skip &&
1858                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1859                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1860                                          OVS_DP_CMD_GET) < 0)
1861                         break;
1862                 i++;
1863         }
1864         ovs_unlock();
1865
1866         cb->args[0] = i;
1867
1868         return skb->len;
1869 }
1870
1871 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1872         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1873         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1874         [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1875 };
1876
1877 static const struct genl_ops dp_datapath_genl_ops[] = {
1878         { .cmd = OVS_DP_CMD_NEW,
1879           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1880           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1881           .doit = ovs_dp_cmd_new
1882         },
1883         { .cmd = OVS_DP_CMD_DEL,
1884           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1885           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1886           .doit = ovs_dp_cmd_del
1887         },
1888         { .cmd = OVS_DP_CMD_GET,
1889           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1890           .flags = 0,               /* OK for unprivileged users. */
1891           .doit = ovs_dp_cmd_get,
1892           .dumpit = ovs_dp_cmd_dump
1893         },
1894         { .cmd = OVS_DP_CMD_SET,
1895           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1896           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1897           .doit = ovs_dp_cmd_set,
1898         },
1899 };
1900
1901 static struct genl_family dp_datapath_genl_family __ro_after_init = {
1902         .hdrsize = sizeof(struct ovs_header),
1903         .name = OVS_DATAPATH_FAMILY,
1904         .version = OVS_DATAPATH_VERSION,
1905         .maxattr = OVS_DP_ATTR_MAX,
1906         .policy = datapath_policy,
1907         .netnsok = true,
1908         .parallel_ops = true,
1909         .ops = dp_datapath_genl_ops,
1910         .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1911         .mcgrps = &ovs_dp_datapath_multicast_group,
1912         .n_mcgrps = 1,
1913         .module = THIS_MODULE,
1914 };
1915
1916 /* Called with ovs_mutex or RCU read lock. */
1917 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1918                                    struct net *net, u32 portid, u32 seq,
1919                                    u32 flags, u8 cmd, gfp_t gfp)
1920 {
1921         struct ovs_header *ovs_header;
1922         struct ovs_vport_stats vport_stats;
1923         int err;
1924
1925         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1926                                  flags, cmd);
1927         if (!ovs_header)
1928                 return -EMSGSIZE;
1929
1930         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1931
1932         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1933             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1934             nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1935                            ovs_vport_name(vport)) ||
1936             nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
1937                 goto nla_put_failure;
1938
1939         if (!net_eq(net, dev_net(vport->dev))) {
1940                 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp);
1941
1942                 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
1943                         goto nla_put_failure;
1944         }
1945
1946         ovs_vport_get_stats(vport, &vport_stats);
1947         if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
1948                           sizeof(struct ovs_vport_stats), &vport_stats,
1949                           OVS_VPORT_ATTR_PAD))
1950                 goto nla_put_failure;
1951
1952         if (ovs_vport_get_upcall_portids(vport, skb))
1953                 goto nla_put_failure;
1954
1955         err = ovs_vport_get_options(vport, skb);
1956         if (err == -EMSGSIZE)
1957                 goto error;
1958
1959         genlmsg_end(skb, ovs_header);
1960         return 0;
1961
1962 nla_put_failure:
1963         err = -EMSGSIZE;
1964 error:
1965         genlmsg_cancel(skb, ovs_header);
1966         return err;
1967 }
1968
1969 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1970 {
1971         return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1972 }
1973
1974 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1975 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
1976                                          u32 portid, u32 seq, u8 cmd)
1977 {
1978         struct sk_buff *skb;
1979         int retval;
1980
1981         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1982         if (!skb)
1983                 return ERR_PTR(-ENOMEM);
1984
1985         retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd,
1986                                          GFP_KERNEL);
1987         BUG_ON(retval < 0);
1988
1989         return skb;
1990 }
1991
1992 /* Called with ovs_mutex or RCU read lock. */
1993 static struct vport *lookup_vport(struct net *net,
1994                                   const struct ovs_header *ovs_header,
1995                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1996 {
1997         struct datapath *dp;
1998         struct vport *vport;
1999
2000         if (a[OVS_VPORT_ATTR_IFINDEX])
2001                 return ERR_PTR(-EOPNOTSUPP);
2002         if (a[OVS_VPORT_ATTR_NAME]) {
2003                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
2004                 if (!vport)
2005                         return ERR_PTR(-ENODEV);
2006                 if (ovs_header->dp_ifindex &&
2007                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
2008                         return ERR_PTR(-ENODEV);
2009                 return vport;
2010         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
2011                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2012
2013                 if (port_no >= DP_MAX_PORTS)
2014                         return ERR_PTR(-EFBIG);
2015
2016                 dp = get_dp(net, ovs_header->dp_ifindex);
2017                 if (!dp)
2018                         return ERR_PTR(-ENODEV);
2019
2020                 vport = ovs_vport_ovsl_rcu(dp, port_no);
2021                 if (!vport)
2022                         return ERR_PTR(-ENODEV);
2023                 return vport;
2024         } else
2025                 return ERR_PTR(-EINVAL);
2026
2027 }
2028
2029 static unsigned int ovs_get_max_headroom(struct datapath *dp)
2030 {
2031         unsigned int dev_headroom, max_headroom = 0;
2032         struct net_device *dev;
2033         struct vport *vport;
2034         int i;
2035
2036         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2037                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2038                         dev = vport->dev;
2039                         dev_headroom = netdev_get_fwd_headroom(dev);
2040                         if (dev_headroom > max_headroom)
2041                                 max_headroom = dev_headroom;
2042                 }
2043         }
2044
2045         return max_headroom;
2046 }
2047
2048 /* Called with ovs_mutex */
2049 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
2050 {
2051         struct vport *vport;
2052         int i;
2053
2054         dp->max_headroom = new_headroom;
2055         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
2056                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
2057                         netdev_set_rx_headroom(vport->dev, new_headroom);
2058 }
2059
2060 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2061 {
2062         struct nlattr **a = info->attrs;
2063         struct ovs_header *ovs_header = info->userhdr;
2064         struct vport_parms parms;
2065         struct sk_buff *reply;
2066         struct vport *vport;
2067         struct datapath *dp;
2068         unsigned int new_headroom;
2069         u32 port_no;
2070         int err;
2071
2072         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2073             !a[OVS_VPORT_ATTR_UPCALL_PID])
2074                 return -EINVAL;
2075         if (a[OVS_VPORT_ATTR_IFINDEX])
2076                 return -EOPNOTSUPP;
2077
2078         port_no = a[OVS_VPORT_ATTR_PORT_NO]
2079                 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2080         if (port_no >= DP_MAX_PORTS)
2081                 return -EFBIG;
2082
2083         reply = ovs_vport_cmd_alloc_info();
2084         if (!reply)
2085                 return -ENOMEM;
2086
2087         ovs_lock();
2088 restart:
2089         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2090         err = -ENODEV;
2091         if (!dp)
2092                 goto exit_unlock_free;
2093
2094         if (port_no) {
2095                 vport = ovs_vport_ovsl(dp, port_no);
2096                 err = -EBUSY;
2097                 if (vport)
2098                         goto exit_unlock_free;
2099         } else {
2100                 for (port_no = 1; ; port_no++) {
2101                         if (port_no >= DP_MAX_PORTS) {
2102                                 err = -EFBIG;
2103                                 goto exit_unlock_free;
2104                         }
2105                         vport = ovs_vport_ovsl(dp, port_no);
2106                         if (!vport)
2107                                 break;
2108                 }
2109         }
2110
2111         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2112         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2113         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2114         parms.dp = dp;
2115         parms.port_no = port_no;
2116         parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2117
2118         vport = new_vport(&parms);
2119         err = PTR_ERR(vport);
2120         if (IS_ERR(vport)) {
2121                 if (err == -EAGAIN)
2122                         goto restart;
2123                 goto exit_unlock_free;
2124         }
2125
2126         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2127                                       info->snd_portid, info->snd_seq, 0,
2128                                       OVS_VPORT_CMD_NEW, GFP_KERNEL);
2129
2130         new_headroom = netdev_get_fwd_headroom(vport->dev);
2131
2132         if (new_headroom > dp->max_headroom)
2133                 ovs_update_headroom(dp, new_headroom);
2134         else
2135                 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2136
2137         BUG_ON(err < 0);
2138         ovs_unlock();
2139
2140         ovs_notify(&dp_vport_genl_family, reply, info);
2141         return 0;
2142
2143 exit_unlock_free:
2144         ovs_unlock();
2145         kfree_skb(reply);
2146         return err;
2147 }
2148
2149 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2150 {
2151         struct nlattr **a = info->attrs;
2152         struct sk_buff *reply;
2153         struct vport *vport;
2154         int err;
2155
2156         reply = ovs_vport_cmd_alloc_info();
2157         if (!reply)
2158                 return -ENOMEM;
2159
2160         ovs_lock();
2161         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2162         err = PTR_ERR(vport);
2163         if (IS_ERR(vport))
2164                 goto exit_unlock_free;
2165
2166         if (a[OVS_VPORT_ATTR_TYPE] &&
2167             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2168                 err = -EINVAL;
2169                 goto exit_unlock_free;
2170         }
2171
2172         if (a[OVS_VPORT_ATTR_OPTIONS]) {
2173                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2174                 if (err)
2175                         goto exit_unlock_free;
2176         }
2177
2178
2179         if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2180                 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2181
2182                 err = ovs_vport_set_upcall_portids(vport, ids);
2183                 if (err)
2184                         goto exit_unlock_free;
2185         }
2186
2187         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2188                                       info->snd_portid, info->snd_seq, 0,
2189                                       OVS_VPORT_CMD_SET, GFP_KERNEL);
2190         BUG_ON(err < 0);
2191
2192         ovs_unlock();
2193         ovs_notify(&dp_vport_genl_family, reply, info);
2194         return 0;
2195
2196 exit_unlock_free:
2197         ovs_unlock();
2198         kfree_skb(reply);
2199         return err;
2200 }
2201
2202 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2203 {
2204         bool update_headroom = false;
2205         struct nlattr **a = info->attrs;
2206         struct sk_buff *reply;
2207         struct datapath *dp;
2208         struct vport *vport;
2209         unsigned int new_headroom;
2210         int err;
2211
2212         reply = ovs_vport_cmd_alloc_info();
2213         if (!reply)
2214                 return -ENOMEM;
2215
2216         ovs_lock();
2217         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2218         err = PTR_ERR(vport);
2219         if (IS_ERR(vport))
2220                 goto exit_unlock_free;
2221
2222         if (vport->port_no == OVSP_LOCAL) {
2223                 err = -EINVAL;
2224                 goto exit_unlock_free;
2225         }
2226
2227         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2228                                       info->snd_portid, info->snd_seq, 0,
2229                                       OVS_VPORT_CMD_DEL, GFP_KERNEL);
2230         BUG_ON(err < 0);
2231
2232         /* the vport deletion may trigger dp headroom update */
2233         dp = vport->dp;
2234         if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2235                 update_headroom = true;
2236
2237         netdev_reset_rx_headroom(vport->dev);
2238         ovs_dp_detach_port(vport);
2239
2240         if (update_headroom) {
2241                 new_headroom = ovs_get_max_headroom(dp);
2242
2243                 if (new_headroom < dp->max_headroom)
2244                         ovs_update_headroom(dp, new_headroom);
2245         }
2246         ovs_unlock();
2247
2248         ovs_notify(&dp_vport_genl_family, reply, info);
2249         return 0;
2250
2251 exit_unlock_free:
2252         ovs_unlock();
2253         kfree_skb(reply);
2254         return err;
2255 }
2256
2257 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2258 {
2259         struct nlattr **a = info->attrs;
2260         struct ovs_header *ovs_header = info->userhdr;
2261         struct sk_buff *reply;
2262         struct vport *vport;
2263         int err;
2264
2265         reply = ovs_vport_cmd_alloc_info();
2266         if (!reply)
2267                 return -ENOMEM;
2268
2269         rcu_read_lock();
2270         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2271         err = PTR_ERR(vport);
2272         if (IS_ERR(vport))
2273                 goto exit_unlock_free;
2274         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2275                                       info->snd_portid, info->snd_seq, 0,
2276                                       OVS_VPORT_CMD_GET, GFP_ATOMIC);
2277         BUG_ON(err < 0);
2278         rcu_read_unlock();
2279
2280         return genlmsg_reply(reply, info);
2281
2282 exit_unlock_free:
2283         rcu_read_unlock();
2284         kfree_skb(reply);
2285         return err;
2286 }
2287
2288 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2289 {
2290         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2291         struct datapath *dp;
2292         int bucket = cb->args[0], skip = cb->args[1];
2293         int i, j = 0;
2294
2295         rcu_read_lock();
2296         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2297         if (!dp) {
2298                 rcu_read_unlock();
2299                 return -ENODEV;
2300         }
2301         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2302                 struct vport *vport;
2303
2304                 j = 0;
2305                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2306                         if (j >= skip &&
2307                             ovs_vport_cmd_fill_info(vport, skb,
2308                                                     sock_net(skb->sk),
2309                                                     NETLINK_CB(cb->skb).portid,
2310                                                     cb->nlh->nlmsg_seq,
2311                                                     NLM_F_MULTI,
2312                                                     OVS_VPORT_CMD_GET,
2313                                                     GFP_ATOMIC) < 0)
2314                                 goto out;
2315
2316                         j++;
2317                 }
2318                 skip = 0;
2319         }
2320 out:
2321         rcu_read_unlock();
2322
2323         cb->args[0] = i;
2324         cb->args[1] = j;
2325
2326         return skb->len;
2327 }
2328
2329 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2330         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2331         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2332         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2333         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2334         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2335         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2336         [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 },
2337         [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2338 };
2339
2340 static const struct genl_ops dp_vport_genl_ops[] = {
2341         { .cmd = OVS_VPORT_CMD_NEW,
2342           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2343           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2344           .doit = ovs_vport_cmd_new
2345         },
2346         { .cmd = OVS_VPORT_CMD_DEL,
2347           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2348           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2349           .doit = ovs_vport_cmd_del
2350         },
2351         { .cmd = OVS_VPORT_CMD_GET,
2352           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2353           .flags = 0,               /* OK for unprivileged users. */
2354           .doit = ovs_vport_cmd_get,
2355           .dumpit = ovs_vport_cmd_dump
2356         },
2357         { .cmd = OVS_VPORT_CMD_SET,
2358           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2359           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2360           .doit = ovs_vport_cmd_set,
2361         },
2362 };
2363
2364 struct genl_family dp_vport_genl_family __ro_after_init = {
2365         .hdrsize = sizeof(struct ovs_header),
2366         .name = OVS_VPORT_FAMILY,
2367         .version = OVS_VPORT_VERSION,
2368         .maxattr = OVS_VPORT_ATTR_MAX,
2369         .policy = vport_policy,
2370         .netnsok = true,
2371         .parallel_ops = true,
2372         .ops = dp_vport_genl_ops,
2373         .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2374         .mcgrps = &ovs_dp_vport_multicast_group,
2375         .n_mcgrps = 1,
2376         .module = THIS_MODULE,
2377 };
2378
2379 static struct genl_family * const dp_genl_families[] = {
2380         &dp_datapath_genl_family,
2381         &dp_vport_genl_family,
2382         &dp_flow_genl_family,
2383         &dp_packet_genl_family,
2384         &dp_meter_genl_family,
2385 #if     IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2386         &dp_ct_limit_genl_family,
2387 #endif
2388 };
2389
2390 static void dp_unregister_genl(int n_families)
2391 {
2392         int i;
2393
2394         for (i = 0; i < n_families; i++)
2395                 genl_unregister_family(dp_genl_families[i]);
2396 }
2397
2398 static int __init dp_register_genl(void)
2399 {
2400         int err;
2401         int i;
2402
2403         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2404
2405                 err = genl_register_family(dp_genl_families[i]);
2406                 if (err)
2407                         goto error;
2408         }
2409
2410         return 0;
2411
2412 error:
2413         dp_unregister_genl(i);
2414         return err;
2415 }
2416
2417 static int __net_init ovs_init_net(struct net *net)
2418 {
2419         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2420
2421         INIT_LIST_HEAD(&ovs_net->dps);
2422         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2423         return ovs_ct_init(net);
2424 }
2425
2426 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2427                                             struct list_head *head)
2428 {
2429         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2430         struct datapath *dp;
2431
2432         list_for_each_entry(dp, &ovs_net->dps, list_node) {
2433                 int i;
2434
2435                 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2436                         struct vport *vport;
2437
2438                         hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2439                                 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2440                                         continue;
2441
2442                                 if (dev_net(vport->dev) == dnet)
2443                                         list_add(&vport->detach_list, head);
2444                         }
2445                 }
2446         }
2447 }
2448
2449 static void __net_exit ovs_exit_net(struct net *dnet)
2450 {
2451         struct datapath *dp, *dp_next;
2452         struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2453         struct vport *vport, *vport_next;
2454         struct net *net;
2455         LIST_HEAD(head);
2456
2457         ovs_ct_exit(dnet);
2458         ovs_lock();
2459         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2460                 __dp_destroy(dp);
2461
2462         down_read(&net_rwsem);
2463         for_each_net(net)
2464                 list_vports_from_net(net, dnet, &head);
2465         up_read(&net_rwsem);
2466
2467         /* Detach all vports from given namespace. */
2468         list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2469                 list_del(&vport->detach_list);
2470                 ovs_dp_detach_port(vport);
2471         }
2472
2473         ovs_unlock();
2474
2475         cancel_work_sync(&ovs_net->dp_notify_work);
2476 }
2477
2478 static struct pernet_operations ovs_net_ops = {
2479         .init = ovs_init_net,
2480         .exit = ovs_exit_net,
2481         .id   = &ovs_net_id,
2482         .size = sizeof(struct ovs_net),
2483 };
2484
2485 static int __init dp_init(void)
2486 {
2487         int err;
2488
2489         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2490
2491         pr_info("Open vSwitch switching datapath\n");
2492
2493         err = action_fifos_init();
2494         if (err)
2495                 goto error;
2496
2497         err = ovs_internal_dev_rtnl_link_register();
2498         if (err)
2499                 goto error_action_fifos_exit;
2500
2501         err = ovs_flow_init();
2502         if (err)
2503                 goto error_unreg_rtnl_link;
2504
2505         err = ovs_vport_init();
2506         if (err)
2507                 goto error_flow_exit;
2508
2509         err = register_pernet_device(&ovs_net_ops);
2510         if (err)
2511                 goto error_vport_exit;
2512
2513         err = register_netdevice_notifier(&ovs_dp_device_notifier);
2514         if (err)
2515                 goto error_netns_exit;
2516
2517         err = ovs_netdev_init();
2518         if (err)
2519                 goto error_unreg_notifier;
2520
2521         err = dp_register_genl();
2522         if (err < 0)
2523                 goto error_unreg_netdev;
2524
2525         return 0;
2526
2527 error_unreg_netdev:
2528         ovs_netdev_exit();
2529 error_unreg_notifier:
2530         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2531 error_netns_exit:
2532         unregister_pernet_device(&ovs_net_ops);
2533 error_vport_exit:
2534         ovs_vport_exit();
2535 error_flow_exit:
2536         ovs_flow_exit();
2537 error_unreg_rtnl_link:
2538         ovs_internal_dev_rtnl_link_unregister();
2539 error_action_fifos_exit:
2540         action_fifos_exit();
2541 error:
2542         return err;
2543 }
2544
2545 static void dp_cleanup(void)
2546 {
2547         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2548         ovs_netdev_exit();
2549         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2550         unregister_pernet_device(&ovs_net_ops);
2551         rcu_barrier();
2552         ovs_vport_exit();
2553         ovs_flow_exit();
2554         ovs_internal_dev_rtnl_link_unregister();
2555         action_fifos_exit();
2556 }
2557
2558 module_init(dp_init);
2559 module_exit(dp_cleanup);
2560
2561 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2562 MODULE_LICENSE("GPL");
2563 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2564 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2565 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2566 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2567 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
2568 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);