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 static void ovs_dp_masks_rebalance(struct work_struct *work);
 134
 135 /* Must be called with rcu_read_lock or ovs_mutex. */
 136 const char *ovs_dp_name(const struct datapath *dp)
 137 {
 138         struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
 139         return ovs_vport_name(vport);
 140 }
 141
 142 static int get_dpifindex(const struct datapath *dp)
 143 {
 144         struct vport *local;
 145         int ifindex;
 146
 147         rcu_read_lock();
 148
 149         local = ovs_vport_rcu(dp, OVSP_LOCAL);
 150         if (local)
 151                 ifindex = local->dev->ifindex;
 152         else
 153                 ifindex = 0;
 154
 155         rcu_read_unlock();
 156
 157         return ifindex;
 158 }
 159
 160 static void destroy_dp_rcu(struct rcu_head *rcu)
 161 {
 162         struct datapath *dp = container_of(rcu, struct datapath, rcu);
 163
 164         ovs_flow_tbl_destroy(&dp->table);
 165         free_percpu(dp->stats_percpu);
 166         kfree(dp->ports);
 167         ovs_meters_exit(dp);
 168         kfree(dp);
 169 }
 170
 171 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
 172                                             u16 port_no)
 173 {
 174         return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
 175 }
 176
 177 /* Called with ovs_mutex or RCU read lock. */
 178 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
 179 {
 180         struct vport *vport;
 181         struct hlist_head *head;
 182
 183         head = vport_hash_bucket(dp, port_no);
 184         hlist_for_each_entry_rcu(vport, head, dp_hash_node,
 185                                 lockdep_ovsl_is_held()) {
 186                 if (vport->port_no == port_no)
 187                         return vport;
 188         }
 189         return NULL;
 190 }
 191
 192 /* Called with ovs_mutex. */
 193 static struct vport *new_vport(const struct vport_parms *parms)
 194 {
 195         struct vport *vport;
 196
 197         vport = ovs_vport_add(parms);
 198         if (!IS_ERR(vport)) {
 199                 struct datapath *dp = parms->dp;
 200                 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
 201
 202                 hlist_add_head_rcu(&vport->dp_hash_node, head);
 203         }
 204         return vport;
 205 }
 206
 207 void ovs_dp_detach_port(struct vport *p)
 208 {
 209         ASSERT_OVSL();
 210
 211         /* First drop references to device. */
 212         hlist_del_rcu(&p->dp_hash_node);
 213
 214         /* Then destroy it. */
 215         ovs_vport_del(p);
 216 }
 217
 218 /* Must be called with rcu_read_lock. */
 219 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
 220 {
 221         const struct vport *p = OVS_CB(skb)->input_vport;
 222         struct datapath *dp = p->dp;
 223         struct sw_flow *flow;
 224         struct sw_flow_actions *sf_acts;
 225         struct dp_stats_percpu *stats;
 226         u64 *stats_counter;
 227         u32 n_mask_hit;
 228         u32 n_cache_hit;
 229         int error;
 230
 231         stats = this_cpu_ptr(dp->stats_percpu);
 232
 233         /* Look up flow. */
 234         flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb),
 235                                          &n_mask_hit, &n_cache_hit);
 236         if (unlikely(!flow)) {
 237                 struct dp_upcall_info upcall;
 238
 239                 memset(&upcall, 0, sizeof(upcall));
 240                 upcall.cmd = OVS_PACKET_CMD_MISS;
 241                 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
 242                 upcall.mru = OVS_CB(skb)->mru;
 243                 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
 244                 if (unlikely(error))
 245                         kfree_skb(skb);
 246                 else
 247                         consume_skb(skb);
 248                 stats_counter = &stats->n_missed;
 249                 goto out;
 250         }
 251
 252         ovs_flow_stats_update(flow, key->tp.flags, skb);
 253         sf_acts = rcu_dereference(flow->sf_acts);
 254         error = ovs_execute_actions(dp, skb, sf_acts, key);
 255         if (unlikely(error))
 256                 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n",
 257                                                         ovs_dp_name(dp), error);
 258
 259         stats_counter = &stats->n_hit;
 260
 261 out:
 262         /* Update datapath statistics. */
 263         u64_stats_update_begin(&stats->syncp);
 264         (*stats_counter)++;
 265         stats->n_mask_hit += n_mask_hit;
 266         stats->n_cache_hit += n_cache_hit;
 267         u64_stats_update_end(&stats->syncp);
 268 }
 269
 270 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
 271                   const struct sw_flow_key *key,
 272                   const struct dp_upcall_info *upcall_info,
 273                   uint32_t cutlen)
 274 {
 275         struct dp_stats_percpu *stats;
 276         int err;
 277
 278         if (upcall_info->portid == 0) {
 279                 err = -ENOTCONN;
 280                 goto err;
 281         }
 282
 283         if (!skb_is_gso(skb))
 284                 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
 285         else
 286                 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
 287         if (err)
 288                 goto err;
 289
 290         return 0;
 291
 292 err:
 293         stats = this_cpu_ptr(dp->stats_percpu);
 294
 295         u64_stats_update_begin(&stats->syncp);
 296         stats->n_lost++;
 297         u64_stats_update_end(&stats->syncp);
 298
 299         return err;
 300 }
 301
 302 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
 303                              const struct sw_flow_key *key,
 304                              const struct dp_upcall_info *upcall_info,
 305                                  uint32_t cutlen)
 306 {
 307         unsigned int gso_type = skb_shinfo(skb)->gso_type;
 308         struct sw_flow_key later_key;
 309         struct sk_buff *segs, *nskb;
 310         int err;
 311
 312         BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET);
 313         segs = __skb_gso_segment(skb, NETIF_F_SG, false);
 314         if (IS_ERR(segs))
 315                 return PTR_ERR(segs);
 316         if (segs == NULL)
 317                 return -EINVAL;
 318
 319         if (gso_type & SKB_GSO_UDP) {
 320                 /* The initial flow key extracted by ovs_flow_key_extract()
 321                  * in this case is for a first fragment, so we need to
 322                  * properly mark later fragments.
 323                  */
 324                 later_key = *key;
 325                 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
 326         }
 327
 328         /* Queue all of the segments. */
 329         skb_list_walk_safe(segs, skb, nskb) {
 330                 if (gso_type & SKB_GSO_UDP && skb != segs)
 331                         key = &later_key;
 332
 333                 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
 334                 if (err)
 335                         break;
 336
 337         }
 338
 339         /* Free all of the segments. */
 340         skb_list_walk_safe(segs, skb, nskb) {
 341                 if (err)
 342                         kfree_skb(skb);
 343                 else
 344                         consume_skb(skb);
 345         }
 346         return err;
 347 }
 348
 349 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
 350                               unsigned int hdrlen, int actions_attrlen)
 351 {
 352         size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
 353                 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
 354                 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
 355                 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */
 356                 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */
 357
 358         /* OVS_PACKET_ATTR_USERDATA */
 359         if (upcall_info->userdata)
 360                 size += NLA_ALIGN(upcall_info->userdata->nla_len);
 361
 362         /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
 363         if (upcall_info->egress_tun_info)
 364                 size += nla_total_size(ovs_tun_key_attr_size());
 365
 366         /* OVS_PACKET_ATTR_ACTIONS */
 367         if (upcall_info->actions_len)
 368                 size += nla_total_size(actions_attrlen);
 369
 370         /* OVS_PACKET_ATTR_MRU */
 371         if (upcall_info->mru)
 372                 size += nla_total_size(sizeof(upcall_info->mru));
 373
 374         return size;
 375 }
 376
 377 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
 378 {
 379         if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
 380                 size_t plen = NLA_ALIGN(skb->len) - skb->len;
 381
 382                 if (plen > 0)
 383                         skb_put_zero(skb, plen);
 384         }
 385 }
 386
 387 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
 388                                   const struct sw_flow_key *key,
 389                                   const struct dp_upcall_info *upcall_info,
 390                                   uint32_t cutlen)
 391 {
 392         struct ovs_header *upcall;
 393         struct sk_buff *nskb = NULL;
 394         struct sk_buff *user_skb = NULL; /* to be queued to userspace */
 395         struct nlattr *nla;
 396         size_t len;
 397         unsigned int hlen;
 398         int err, dp_ifindex;
 399         u64 hash;
 400
 401         dp_ifindex = get_dpifindex(dp);
 402         if (!dp_ifindex)
 403                 return -ENODEV;
 404
 405         if (skb_vlan_tag_present(skb)) {
 406                 nskb = skb_clone(skb, GFP_ATOMIC);
 407                 if (!nskb)
 408                         return -ENOMEM;
 409
 410                 nskb = __vlan_hwaccel_push_inside(nskb);
 411                 if (!nskb)
 412                         return -ENOMEM;
 413
 414                 skb = nskb;
 415         }
 416
 417         if (nla_attr_size(skb->len) > USHRT_MAX) {
 418                 err = -EFBIG;
 419                 goto out;
 420         }
 421
 422         /* Complete checksum if needed */
 423         if (skb->ip_summed == CHECKSUM_PARTIAL &&
 424             (err = skb_csum_hwoffload_help(skb, 0)))
 425                 goto out;
 426
 427         /* Older versions of OVS user space enforce alignment of the last
 428          * Netlink attribute to NLA_ALIGNTO which would require extensive
 429          * padding logic. Only perform zerocopy if padding is not required.
 430          */
 431         if (dp->user_features & OVS_DP_F_UNALIGNED)
 432                 hlen = skb_zerocopy_headlen(skb);
 433         else
 434                 hlen = skb->len;
 435
 436         len = upcall_msg_size(upcall_info, hlen - cutlen,
 437                               OVS_CB(skb)->acts_origlen);
 438         user_skb = genlmsg_new(len, GFP_ATOMIC);
 439         if (!user_skb) {
 440                 err = -ENOMEM;
 441                 goto out;
 442         }
 443
 444         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
 445                              0, upcall_info->cmd);
 446         if (!upcall) {
 447                 err = -EINVAL;
 448                 goto out;
 449         }
 450         upcall->dp_ifindex = dp_ifindex;
 451
 452         err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
 453         if (err)
 454                 goto out;
 455
 456         if (upcall_info->userdata)
 457                 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
 458                           nla_len(upcall_info->userdata),
 459                           nla_data(upcall_info->userdata));
 460
 461         if (upcall_info->egress_tun_info) {
 462                 nla = nla_nest_start_noflag(user_skb,
 463                                             OVS_PACKET_ATTR_EGRESS_TUN_KEY);
 464                 if (!nla) {
 465                         err = -EMSGSIZE;
 466                         goto out;
 467                 }
 468                 err = ovs_nla_put_tunnel_info(user_skb,
 469                                               upcall_info->egress_tun_info);
 470                 if (err)
 471                         goto out;
 472
 473                 nla_nest_end(user_skb, nla);
 474         }
 475
 476         if (upcall_info->actions_len) {
 477                 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS);
 478                 if (!nla) {
 479                         err = -EMSGSIZE;
 480                         goto out;
 481                 }
 482                 err = ovs_nla_put_actions(upcall_info->actions,
 483                                           upcall_info->actions_len,
 484                                           user_skb);
 485                 if (!err)
 486                         nla_nest_end(user_skb, nla);
 487                 else
 488                         nla_nest_cancel(user_skb, nla);
 489         }
 490
 491         /* Add OVS_PACKET_ATTR_MRU */
 492         if (upcall_info->mru &&
 493             nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) {
 494                 err = -ENOBUFS;
 495                 goto out;
 496         }
 497
 498         /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
 499         if (cutlen > 0 &&
 500             nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) {
 501                 err = -ENOBUFS;
 502                 goto out;
 503         }
 504
 505         /* Add OVS_PACKET_ATTR_HASH */
 506         hash = skb_get_hash_raw(skb);
 507         if (skb->sw_hash)
 508                 hash |= OVS_PACKET_HASH_SW_BIT;
 509
 510         if (skb->l4_hash)
 511                 hash |= OVS_PACKET_HASH_L4_BIT;
 512
 513         if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) {
 514                 err = -ENOBUFS;
 515                 goto out;
 516         }
 517
 518         /* Only reserve room for attribute header, packet data is added
 519          * in skb_zerocopy() */
 520         if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
 521                 err = -ENOBUFS;
 522                 goto out;
 523         }
 524         nla->nla_len = nla_attr_size(skb->len - cutlen);
 525
 526         err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
 527         if (err)
 528                 goto out;
 529
 530         /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
 531         pad_packet(dp, user_skb);
 532
 533         ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
 534
 535         err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
 536         user_skb = NULL;
 537 out:
 538         if (err)
 539                 skb_tx_error(skb);
 540         kfree_skb(user_skb);
 541         kfree_skb(nskb);
 542         return err;
 543 }
 544
 545 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 546 {
 547         struct ovs_header *ovs_header = info->userhdr;
 548         struct net *net = sock_net(skb->sk);
 549         struct nlattr **a = info->attrs;
 550         struct sw_flow_actions *acts;
 551         struct sk_buff *packet;
 552         struct sw_flow *flow;
 553         struct sw_flow_actions *sf_acts;
 554         struct datapath *dp;
 555         struct vport *input_vport;
 556         u16 mru = 0;
 557         u64 hash;
 558         int len;
 559         int err;
 560         bool log = !a[OVS_PACKET_ATTR_PROBE];
 561
 562         err = -EINVAL;
 563         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 564             !a[OVS_PACKET_ATTR_ACTIONS])
 565                 goto err;
 566
 567         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 568         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 569         err = -ENOMEM;
 570         if (!packet)
 571                 goto err;
 572         skb_reserve(packet, NET_IP_ALIGN);
 573
 574         nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
 575
 576         /* Set packet's mru */
 577         if (a[OVS_PACKET_ATTR_MRU]) {
 578                 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
 579                 packet->ignore_df = 1;
 580         }
 581         OVS_CB(packet)->mru = mru;
 582
 583         if (a[OVS_PACKET_ATTR_HASH]) {
 584                 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]);
 585
 586                 __skb_set_hash(packet, hash & 0xFFFFFFFFULL,
 587                                !!(hash & OVS_PACKET_HASH_SW_BIT),
 588                                !!(hash & OVS_PACKET_HASH_L4_BIT));
 589         }
 590
 591         /* Build an sw_flow for sending this packet. */
 592         flow = ovs_flow_alloc();
 593         err = PTR_ERR(flow);
 594         if (IS_ERR(flow))
 595                 goto err_kfree_skb;
 596
 597         err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
 598                                              packet, &flow->key, log);
 599         if (err)
 600                 goto err_flow_free;
 601
 602         err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
 603                                    &flow->key, &acts, log);
 604         if (err)
 605                 goto err_flow_free;
 606
 607         rcu_assign_pointer(flow->sf_acts, acts);
 608         packet->priority = flow->key.phy.priority;
 609         packet->mark = flow->key.phy.skb_mark;
 610
 611         rcu_read_lock();
 612         dp = get_dp_rcu(net, ovs_header->dp_ifindex);
 613         err = -ENODEV;
 614         if (!dp)
 615                 goto err_unlock;
 616
 617         input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
 618         if (!input_vport)
 619                 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
 620
 621         if (!input_vport)
 622                 goto err_unlock;
 623
 624         packet->dev = input_vport->dev;
 625         OVS_CB(packet)->input_vport = input_vport;
 626         sf_acts = rcu_dereference(flow->sf_acts);
 627
 628         local_bh_disable();
 629         err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
 630         local_bh_enable();
 631         rcu_read_unlock();
 632
 633         ovs_flow_free(flow, false);
 634         return err;
 635
 636 err_unlock:
 637         rcu_read_unlock();
 638 err_flow_free:
 639         ovs_flow_free(flow, false);
 640 err_kfree_skb:
 641         kfree_skb(packet);
 642 err:
 643         return err;
 644 }
 645
 646 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 647         [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
 648         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 649         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 650         [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
 651         [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
 652         [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 },
 653 };
 654
 655 static const struct genl_ops dp_packet_genl_ops[] = {
 656         { .cmd = OVS_PACKET_CMD_EXECUTE,
 657           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
 658           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 659           .doit = ovs_packet_cmd_execute
 660         }
 661 };
 662
 663 static struct genl_family dp_packet_genl_family __ro_after_init = {
 664         .hdrsize = sizeof(struct ovs_header),
 665         .name = OVS_PACKET_FAMILY,
 666         .version = OVS_PACKET_VERSION,
 667         .maxattr = OVS_PACKET_ATTR_MAX,
 668         .policy = packet_policy,
 669         .netnsok = true,
 670         .parallel_ops = true,
 671         .ops = dp_packet_genl_ops,
 672         .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
 673         .module = THIS_MODULE,
 674 };
 675
 676 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
 677                          struct ovs_dp_megaflow_stats *mega_stats)
 678 {
 679         int i;
 680
 681         memset(mega_stats, 0, sizeof(*mega_stats));
 682
 683         stats->n_flows = ovs_flow_tbl_count(&dp->table);
 684         mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
 685
 686         stats->n_hit = stats->n_missed = stats->n_lost = 0;
 687
 688         for_each_possible_cpu(i) {
 689                 const struct dp_stats_percpu *percpu_stats;
 690                 struct dp_stats_percpu local_stats;
 691                 unsigned int start;
 692
 693                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 694
 695                 do {
 696                         start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
 697                         local_stats = *percpu_stats;
 698                 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
 699
 700                 stats->n_hit += local_stats.n_hit;
 701                 stats->n_missed += local_stats.n_missed;
 702                 stats->n_lost += local_stats.n_lost;
 703                 mega_stats->n_mask_hit += local_stats.n_mask_hit;
 704                 mega_stats->n_cache_hit += local_stats.n_cache_hit;
 705         }
 706 }
 707
 708 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
 709 {
 710         return ovs_identifier_is_ufid(sfid) &&
 711                !(ufid_flags & OVS_UFID_F_OMIT_KEY);
 712 }
 713
 714 static bool should_fill_mask(uint32_t ufid_flags)
 715 {
 716         return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
 717 }
 718
 719 static bool should_fill_actions(uint32_t ufid_flags)
 720 {
 721         return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
 722 }
 723
 724 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
 725                                     const struct sw_flow_id *sfid,
 726                                     uint32_t ufid_flags)
 727 {
 728         size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
 729
 730         /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
 731          * see ovs_nla_put_identifier()
 732          */
 733         if (sfid && ovs_identifier_is_ufid(sfid))
 734                 len += nla_total_size(sfid->ufid_len);
 735         else
 736                 len += nla_total_size(ovs_key_attr_size());
 737
 738         /* OVS_FLOW_ATTR_KEY */
 739         if (!sfid || should_fill_key(sfid, ufid_flags))
 740                 len += nla_total_size(ovs_key_attr_size());
 741
 742         /* OVS_FLOW_ATTR_MASK */
 743         if (should_fill_mask(ufid_flags))
 744                 len += nla_total_size(ovs_key_attr_size());
 745
 746         /* OVS_FLOW_ATTR_ACTIONS */
 747         if (should_fill_actions(ufid_flags))
 748                 len += nla_total_size(acts->orig_len);
 749
 750         return len
 751                 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
 752                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
 753                 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
 754 }
 755
 756 /* Called with ovs_mutex or RCU read lock. */
 757 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
 758                                    struct sk_buff *skb)
 759 {
 760         struct ovs_flow_stats stats;
 761         __be16 tcp_flags;
 762         unsigned long used;
 763
 764         ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
 765
 766         if (used &&
 767             nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
 768                               OVS_FLOW_ATTR_PAD))
 769                 return -EMSGSIZE;
 770
 771         if (stats.n_packets &&
 772             nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
 773                           sizeof(struct ovs_flow_stats), &stats,
 774                           OVS_FLOW_ATTR_PAD))
 775                 return -EMSGSIZE;
 776
 777         if ((u8)ntohs(tcp_flags) &&
 778              nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
 779                 return -EMSGSIZE;
 780
 781         return 0;
 782 }
 783
 784 /* Called with ovs_mutex or RCU read lock. */
 785 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
 786                                      struct sk_buff *skb, int skb_orig_len)
 787 {
 788         struct nlattr *start;
 789         int err;
 790
 791         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 792          * this is the first flow to be dumped into 'skb'.  This is unusual for
 793          * Netlink but individual action lists can be longer than
 794          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 795          * The userspace caller can always fetch the actions separately if it
 796          * really wants them.  (Most userspace callers in fact don't care.)
 797          *
 798          * This can only fail for dump operations because the skb is always
 799          * properly sized for single flows.
 800          */
 801         start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS);
 802         if (start) {
 803                 const struct sw_flow_actions *sf_acts;
 804
 805                 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
 806                 err = ovs_nla_put_actions(sf_acts->actions,
 807                                           sf_acts->actions_len, skb);
 808
 809                 if (!err)
 810                         nla_nest_end(skb, start);
 811                 else {
 812                         if (skb_orig_len)
 813                                 return err;
 814
 815                         nla_nest_cancel(skb, start);
 816                 }
 817         } else if (skb_orig_len) {
 818                 return -EMSGSIZE;
 819         }
 820
 821         return 0;
 822 }
 823
 824 /* Called with ovs_mutex or RCU read lock. */
 825 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
 826                                   struct sk_buff *skb, u32 portid,
 827                                   u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
 828 {
 829         const int skb_orig_len = skb->len;
 830         struct ovs_header *ovs_header;
 831         int err;
 832
 833         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
 834                                  flags, cmd);
 835         if (!ovs_header)
 836                 return -EMSGSIZE;
 837
 838         ovs_header->dp_ifindex = dp_ifindex;
 839
 840         err = ovs_nla_put_identifier(flow, skb);
 841         if (err)
 842                 goto error;
 843
 844         if (should_fill_key(&flow->id, ufid_flags)) {
 845                 err = ovs_nla_put_masked_key(flow, skb);
 846                 if (err)
 847                         goto error;
 848         }
 849
 850         if (should_fill_mask(ufid_flags)) {
 851                 err = ovs_nla_put_mask(flow, skb);
 852                 if (err)
 853                         goto error;
 854         }
 855
 856         err = ovs_flow_cmd_fill_stats(flow, skb);
 857         if (err)
 858                 goto error;
 859
 860         if (should_fill_actions(ufid_flags)) {
 861                 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
 862                 if (err)
 863                         goto error;
 864         }
 865
 866         genlmsg_end(skb, ovs_header);
 867         return 0;
 868
 869 error:
 870         genlmsg_cancel(skb, ovs_header);
 871         return err;
 872 }
 873
 874 /* May not be called with RCU read lock. */
 875 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
 876                                                const struct sw_flow_id *sfid,
 877                                                struct genl_info *info,
 878                                                bool always,
 879                                                uint32_t ufid_flags)
 880 {
 881         struct sk_buff *skb;
 882         size_t len;
 883
 884         if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
 885                 return NULL;
 886
 887         len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
 888         skb = genlmsg_new(len, GFP_KERNEL);
 889         if (!skb)
 890                 return ERR_PTR(-ENOMEM);
 891
 892         return skb;
 893 }
 894
 895 /* Called with ovs_mutex. */
 896 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
 897                                                int dp_ifindex,
 898                                                struct genl_info *info, u8 cmd,
 899                                                bool always, u32 ufid_flags)
 900 {
 901         struct sk_buff *skb;
 902         int retval;
 903
 904         skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
 905                                       &flow->id, info, always, ufid_flags);
 906         if (IS_ERR_OR_NULL(skb))
 907                 return skb;
 908
 909         retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
 910                                         info->snd_portid, info->snd_seq, 0,
 911                                         cmd, ufid_flags);
 912         if (WARN_ON_ONCE(retval < 0)) {
 913                 kfree_skb(skb);
 914                 skb = ERR_PTR(retval);
 915         }
 916         return skb;
 917 }
 918
 919 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
 920 {
 921         struct net *net = sock_net(skb->sk);
 922         struct nlattr **a = info->attrs;
 923         struct ovs_header *ovs_header = info->userhdr;
 924         struct sw_flow *flow = NULL, *new_flow;
 925         struct sw_flow_mask mask;
 926         struct sk_buff *reply;
 927         struct datapath *dp;
 928         struct sw_flow_actions *acts;
 929         struct sw_flow_match match;
 930         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
 931         int error;
 932         bool log = !a[OVS_FLOW_ATTR_PROBE];
 933
 934         /* Must have key and actions. */
 935         error = -EINVAL;
 936         if (!a[OVS_FLOW_ATTR_KEY]) {
 937                 OVS_NLERR(log, "Flow key attr not present in new flow.");
 938                 goto error;
 939         }
 940         if (!a[OVS_FLOW_ATTR_ACTIONS]) {
 941                 OVS_NLERR(log, "Flow actions attr not present in new flow.");
 942                 goto error;
 943         }
 944
 945         /* Most of the time we need to allocate a new flow, do it before
 946          * locking.
 947          */
 948         new_flow = ovs_flow_alloc();
 949         if (IS_ERR(new_flow)) {
 950                 error = PTR_ERR(new_flow);
 951                 goto error;
 952         }
 953
 954         /* Extract key. */
 955         ovs_match_init(&match, &new_flow->key, false, &mask);
 956         error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
 957                                   a[OVS_FLOW_ATTR_MASK], log);
 958         if (error)
 959                 goto err_kfree_flow;
 960
 961         /* Extract flow identifier. */
 962         error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
 963                                        &new_flow->key, log);
 964         if (error)
 965                 goto err_kfree_flow;
 966
 967         /* unmasked key is needed to match when ufid is not used. */
 968         if (ovs_identifier_is_key(&new_flow->id))
 969                 match.key = new_flow->id.unmasked_key;
 970
 971         ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
 972
 973         /* Validate actions. */
 974         error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
 975                                      &new_flow->key, &acts, log);
 976         if (error) {
 977                 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
 978                 goto err_kfree_flow;
 979         }
 980
 981         reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
 982                                         ufid_flags);
 983         if (IS_ERR(reply)) {
 984                 error = PTR_ERR(reply);
 985                 goto err_kfree_acts;
 986         }
 987
 988         ovs_lock();
 989         dp = get_dp(net, ovs_header->dp_ifindex);
 990         if (unlikely(!dp)) {
 991                 error = -ENODEV;
 992                 goto err_unlock_ovs;
 993         }
 994
 995         /* Check if this is a duplicate flow */
 996         if (ovs_identifier_is_ufid(&new_flow->id))
 997                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
 998         if (!flow)
 999                 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
1000         if (likely(!flow)) {
1001                 rcu_assign_pointer(new_flow->sf_acts, acts);
1002
1003                 /* Put flow in bucket. */
1004                 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
1005                 if (unlikely(error)) {
1006                         acts = NULL;
1007                         goto err_unlock_ovs;
1008                 }
1009
1010                 if (unlikely(reply)) {
1011                         error = ovs_flow_cmd_fill_info(new_flow,
1012                                                        ovs_header->dp_ifindex,
1013                                                        reply, info->snd_portid,
1014                                                        info->snd_seq, 0,
1015                                                        OVS_FLOW_CMD_NEW,
1016                                                        ufid_flags);
1017                         BUG_ON(error < 0);
1018                 }
1019                 ovs_unlock();
1020         } else {
1021                 struct sw_flow_actions *old_acts;
1022
1023                 /* Bail out if we're not allowed to modify an existing flow.
1024                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1025                  * because Generic Netlink treats the latter as a dump
1026                  * request.  We also accept NLM_F_EXCL in case that bug ever
1027                  * gets fixed.
1028                  */
1029                 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1030                                                          | NLM_F_EXCL))) {
1031                         error = -EEXIST;
1032                         goto err_unlock_ovs;
1033                 }
1034                 /* The flow identifier has to be the same for flow updates.
1035                  * Look for any overlapping flow.
1036                  */
1037                 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1038                         if (ovs_identifier_is_key(&flow->id))
1039                                 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1040                                                                  &match);
1041                         else /* UFID matches but key is different */
1042                                 flow = NULL;
1043                         if (!flow) {
1044                                 error = -ENOENT;
1045                                 goto err_unlock_ovs;
1046                         }
1047                 }
1048                 /* Update actions. */
1049                 old_acts = ovsl_dereference(flow->sf_acts);
1050                 rcu_assign_pointer(flow->sf_acts, acts);
1051
1052                 if (unlikely(reply)) {
1053                         error = ovs_flow_cmd_fill_info(flow,
1054                                                        ovs_header->dp_ifindex,
1055                                                        reply, info->snd_portid,
1056                                                        info->snd_seq, 0,
1057                                                        OVS_FLOW_CMD_NEW,
1058                                                        ufid_flags);
1059                         BUG_ON(error < 0);
1060                 }
1061                 ovs_unlock();
1062
1063                 ovs_nla_free_flow_actions_rcu(old_acts);
1064                 ovs_flow_free(new_flow, false);
1065         }
1066
1067         if (reply)
1068                 ovs_notify(&dp_flow_genl_family, reply, info);
1069         return 0;
1070
1071 err_unlock_ovs:
1072         ovs_unlock();
1073         kfree_skb(reply);
1074 err_kfree_acts:
1075         ovs_nla_free_flow_actions(acts);
1076 err_kfree_flow:
1077         ovs_flow_free(new_flow, false);
1078 error:
1079         return error;
1080 }
1081
1082 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1083 static noinline_for_stack struct sw_flow_actions *get_flow_actions(struct net *net,
1084                                                 const struct nlattr *a,
1085                                                 const struct sw_flow_key *key,
1086                                                 const struct sw_flow_mask *mask,
1087                                                 bool log)
1088 {
1089         struct sw_flow_actions *acts;
1090         struct sw_flow_key masked_key;
1091         int error;
1092
1093         ovs_flow_mask_key(&masked_key, key, true, mask);
1094         error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1095         if (error) {
1096                 OVS_NLERR(log,
1097                           "Actions may not be safe on all matching packets");
1098                 return ERR_PTR(error);
1099         }
1100
1101         return acts;
1102 }
1103
1104 /* Factor out match-init and action-copy to avoid
1105  * "Wframe-larger-than=1024" warning. Because mask is only
1106  * used to get actions, we new a function to save some
1107  * stack space.
1108  *
1109  * If there are not key and action attrs, we return 0
1110  * directly. In the case, the caller will also not use the
1111  * match as before. If there is action attr, we try to get
1112  * actions and save them to *acts. Before returning from
1113  * the function, we reset the match->mask pointer. Because
1114  * we should not to return match object with dangling reference
1115  * to mask.
1116  * */
1117 static noinline_for_stack int
1118 ovs_nla_init_match_and_action(struct net *net,
1119                               struct sw_flow_match *match,
1120                               struct sw_flow_key *key,
1121                               struct nlattr **a,
1122                               struct sw_flow_actions **acts,
1123                               bool log)
1124 {
1125         struct sw_flow_mask mask;
1126         int error = 0;
1127
1128         if (a[OVS_FLOW_ATTR_KEY]) {
1129                 ovs_match_init(match, key, true, &mask);
1130                 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1131                                           a[OVS_FLOW_ATTR_MASK], log);
1132                 if (error)
1133                         goto error;
1134         }
1135
1136         if (a[OVS_FLOW_ATTR_ACTIONS]) {
1137                 if (!a[OVS_FLOW_ATTR_KEY]) {
1138                         OVS_NLERR(log,
1139                                   "Flow key attribute not present in set flow.");
1140                         error = -EINVAL;
1141                         goto error;
1142                 }
1143
1144                 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1145                                          &mask, log);
1146                 if (IS_ERR(*acts)) {
1147                         error = PTR_ERR(*acts);
1148                         goto error;
1149                 }
1150         }
1151
1152         /* On success, error is 0. */
1153 error:
1154         match->mask = NULL;
1155         return error;
1156 }
1157
1158 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1159 {
1160         struct net *net = sock_net(skb->sk);
1161         struct nlattr **a = info->attrs;
1162         struct ovs_header *ovs_header = info->userhdr;
1163         struct sw_flow_key key;
1164         struct sw_flow *flow;
1165         struct sk_buff *reply = NULL;
1166         struct datapath *dp;
1167         struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1168         struct sw_flow_match match;
1169         struct sw_flow_id sfid;
1170         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1171         int error = 0;
1172         bool log = !a[OVS_FLOW_ATTR_PROBE];
1173         bool ufid_present;
1174
1175         ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1176         if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1177                 OVS_NLERR(log,
1178                           "Flow set message rejected, Key attribute missing.");
1179                 return -EINVAL;
1180         }
1181
1182         error = ovs_nla_init_match_and_action(net, &match, &key, a,
1183                                               &acts, log);
1184         if (error)
1185                 goto error;
1186
1187         if (acts) {
1188                 /* Can allocate before locking if have acts. */
1189                 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1190                                                 ufid_flags);
1191                 if (IS_ERR(reply)) {
1192                         error = PTR_ERR(reply);
1193                         goto err_kfree_acts;
1194                 }
1195         }
1196
1197         ovs_lock();
1198         dp = get_dp(net, ovs_header->dp_ifindex);
1199         if (unlikely(!dp)) {
1200                 error = -ENODEV;
1201                 goto err_unlock_ovs;
1202         }
1203         /* Check that the flow exists. */
1204         if (ufid_present)
1205                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1206         else
1207                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1208         if (unlikely(!flow)) {
1209                 error = -ENOENT;
1210                 goto err_unlock_ovs;
1211         }
1212
1213         /* Update actions, if present. */
1214         if (likely(acts)) {
1215                 old_acts = ovsl_dereference(flow->sf_acts);
1216                 rcu_assign_pointer(flow->sf_acts, acts);
1217
1218                 if (unlikely(reply)) {
1219                         error = ovs_flow_cmd_fill_info(flow,
1220                                                        ovs_header->dp_ifindex,
1221                                                        reply, info->snd_portid,
1222                                                        info->snd_seq, 0,
1223                                                        OVS_FLOW_CMD_SET,
1224                                                        ufid_flags);
1225                         BUG_ON(error < 0);
1226                 }
1227         } else {
1228                 /* Could not alloc without acts before locking. */
1229                 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1230                                                 info, OVS_FLOW_CMD_SET, false,
1231                                                 ufid_flags);
1232
1233                 if (IS_ERR(reply)) {
1234                         error = PTR_ERR(reply);
1235                         goto err_unlock_ovs;
1236                 }
1237         }
1238
1239         /* Clear stats. */
1240         if (a[OVS_FLOW_ATTR_CLEAR])
1241                 ovs_flow_stats_clear(flow);
1242         ovs_unlock();
1243
1244         if (reply)
1245                 ovs_notify(&dp_flow_genl_family, reply, info);
1246         if (old_acts)
1247                 ovs_nla_free_flow_actions_rcu(old_acts);
1248
1249         return 0;
1250
1251 err_unlock_ovs:
1252         ovs_unlock();
1253         kfree_skb(reply);
1254 err_kfree_acts:
1255         ovs_nla_free_flow_actions(acts);
1256 error:
1257         return error;
1258 }
1259
1260 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1261 {
1262         struct nlattr **a = info->attrs;
1263         struct ovs_header *ovs_header = info->userhdr;
1264         struct net *net = sock_net(skb->sk);
1265         struct sw_flow_key key;
1266         struct sk_buff *reply;
1267         struct sw_flow *flow;
1268         struct datapath *dp;
1269         struct sw_flow_match match;
1270         struct sw_flow_id ufid;
1271         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1272         int err = 0;
1273         bool log = !a[OVS_FLOW_ATTR_PROBE];
1274         bool ufid_present;
1275
1276         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1277         if (a[OVS_FLOW_ATTR_KEY]) {
1278                 ovs_match_init(&match, &key, true, NULL);
1279                 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1280                                         log);
1281         } else if (!ufid_present) {
1282                 OVS_NLERR(log,
1283                           "Flow get message rejected, Key attribute missing.");
1284                 err = -EINVAL;
1285         }
1286         if (err)
1287                 return err;
1288
1289         ovs_lock();
1290         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1291         if (!dp) {
1292                 err = -ENODEV;
1293                 goto unlock;
1294         }
1295
1296         if (ufid_present)
1297                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1298         else
1299                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1300         if (!flow) {
1301                 err = -ENOENT;
1302                 goto unlock;
1303         }
1304
1305         reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1306                                         OVS_FLOW_CMD_GET, true, ufid_flags);
1307         if (IS_ERR(reply)) {
1308                 err = PTR_ERR(reply);
1309                 goto unlock;
1310         }
1311
1312         ovs_unlock();
1313         return genlmsg_reply(reply, info);
1314 unlock:
1315         ovs_unlock();
1316         return err;
1317 }
1318
1319 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1320 {
1321         struct nlattr **a = info->attrs;
1322         struct ovs_header *ovs_header = info->userhdr;
1323         struct net *net = sock_net(skb->sk);
1324         struct sw_flow_key key;
1325         struct sk_buff *reply;
1326         struct sw_flow *flow = NULL;
1327         struct datapath *dp;
1328         struct sw_flow_match match;
1329         struct sw_flow_id ufid;
1330         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1331         int err;
1332         bool log = !a[OVS_FLOW_ATTR_PROBE];
1333         bool ufid_present;
1334
1335         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1336         if (a[OVS_FLOW_ATTR_KEY]) {
1337                 ovs_match_init(&match, &key, true, NULL);
1338                 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1339                                         NULL, log);
1340                 if (unlikely(err))
1341                         return err;
1342         }
1343
1344         ovs_lock();
1345         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1346         if (unlikely(!dp)) {
1347                 err = -ENODEV;
1348                 goto unlock;
1349         }
1350
1351         if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1352                 err = ovs_flow_tbl_flush(&dp->table);
1353                 goto unlock;
1354         }
1355
1356         if (ufid_present)
1357                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1358         else
1359                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1360         if (unlikely(!flow)) {
1361                 err = -ENOENT;
1362                 goto unlock;
1363         }
1364
1365         ovs_flow_tbl_remove(&dp->table, flow);
1366         ovs_unlock();
1367
1368         reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1369                                         &flow->id, info, false, ufid_flags);
1370         if (likely(reply)) {
1371                 if (!IS_ERR(reply)) {
1372                         rcu_read_lock();        /*To keep RCU checker happy. */
1373                         err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1374                                                      reply, info->snd_portid,
1375                                                      info->snd_seq, 0,
1376                                                      OVS_FLOW_CMD_DEL,
1377                                                      ufid_flags);
1378                         rcu_read_unlock();
1379                         if (WARN_ON_ONCE(err < 0)) {
1380                                 kfree_skb(reply);
1381                                 goto out_free;
1382                         }
1383
1384                         ovs_notify(&dp_flow_genl_family, reply, info);
1385                 } else {
1386                         netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1387                 }
1388         }
1389
1390 out_free:
1391         ovs_flow_free(flow, true);
1392         return 0;
1393 unlock:
1394         ovs_unlock();
1395         return err;
1396 }
1397
1398 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1399 {
1400         struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1401         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1402         struct table_instance *ti;
1403         struct datapath *dp;
1404         u32 ufid_flags;
1405         int err;
1406
1407         err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a,
1408                                        OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1409         if (err)
1410                 return err;
1411         ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1412
1413         rcu_read_lock();
1414         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1415         if (!dp) {
1416                 rcu_read_unlock();
1417                 return -ENODEV;
1418         }
1419
1420         ti = rcu_dereference(dp->table.ti);
1421         for (;;) {
1422                 struct sw_flow *flow;
1423                 u32 bucket, obj;
1424
1425                 bucket = cb->args[0];
1426                 obj = cb->args[1];
1427                 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1428                 if (!flow)
1429                         break;
1430
1431                 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1432                                            NETLINK_CB(cb->skb).portid,
1433                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1434                                            OVS_FLOW_CMD_GET, ufid_flags) < 0)
1435                         break;
1436
1437                 cb->args[0] = bucket;
1438                 cb->args[1] = obj;
1439         }
1440         rcu_read_unlock();
1441         return skb->len;
1442 }
1443
1444 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1445         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1446         [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1447         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1448         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1449         [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1450         [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1451         [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1452 };
1453
1454 static const struct genl_ops dp_flow_genl_ops[] = {
1455         { .cmd = OVS_FLOW_CMD_NEW,
1456           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1457           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1458           .doit = ovs_flow_cmd_new
1459         },
1460         { .cmd = OVS_FLOW_CMD_DEL,
1461           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1462           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1463           .doit = ovs_flow_cmd_del
1464         },
1465         { .cmd = OVS_FLOW_CMD_GET,
1466           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1467           .flags = 0,               /* OK for unprivileged users. */
1468           .doit = ovs_flow_cmd_get,
1469           .dumpit = ovs_flow_cmd_dump
1470         },
1471         { .cmd = OVS_FLOW_CMD_SET,
1472           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1473           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1474           .doit = ovs_flow_cmd_set,
1475         },
1476 };
1477
1478 static struct genl_family dp_flow_genl_family __ro_after_init = {
1479         .hdrsize = sizeof(struct ovs_header),
1480         .name = OVS_FLOW_FAMILY,
1481         .version = OVS_FLOW_VERSION,
1482         .maxattr = OVS_FLOW_ATTR_MAX,
1483         .policy = flow_policy,
1484         .netnsok = true,
1485         .parallel_ops = true,
1486         .ops = dp_flow_genl_ops,
1487         .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1488         .mcgrps = &ovs_dp_flow_multicast_group,
1489         .n_mcgrps = 1,
1490         .module = THIS_MODULE,
1491 };
1492
1493 static size_t ovs_dp_cmd_msg_size(void)
1494 {
1495         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1496
1497         msgsize += nla_total_size(IFNAMSIZ);
1498         msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1499         msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1500         msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1501         msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */
1502
1503         return msgsize;
1504 }
1505
1506 /* Called with ovs_mutex. */
1507 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1508                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1509 {
1510         struct ovs_header *ovs_header;
1511         struct ovs_dp_stats dp_stats;
1512         struct ovs_dp_megaflow_stats dp_megaflow_stats;
1513         int err;
1514
1515         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1516                                    flags, cmd);
1517         if (!ovs_header)
1518                 goto error;
1519
1520         ovs_header->dp_ifindex = get_dpifindex(dp);
1521
1522         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1523         if (err)
1524                 goto nla_put_failure;
1525
1526         get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1527         if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1528                           &dp_stats, OVS_DP_ATTR_PAD))
1529                 goto nla_put_failure;
1530
1531         if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1532                           sizeof(struct ovs_dp_megaflow_stats),
1533                           &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1534                 goto nla_put_failure;
1535
1536         if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1537                 goto nla_put_failure;
1538
1539         if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE,
1540                         ovs_flow_tbl_masks_cache_size(&dp->table)))
1541                 goto nla_put_failure;
1542
1543         genlmsg_end(skb, ovs_header);
1544         return 0;
1545
1546 nla_put_failure:
1547         genlmsg_cancel(skb, ovs_header);
1548 error:
1549         return -EMSGSIZE;
1550 }
1551
1552 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1553 {
1554         return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1555 }
1556
1557 /* Called with rcu_read_lock or ovs_mutex. */
1558 static struct datapath *lookup_datapath(struct net *net,
1559                                         const struct ovs_header *ovs_header,
1560                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1561 {
1562         struct datapath *dp;
1563
1564         if (!a[OVS_DP_ATTR_NAME])
1565                 dp = get_dp(net, ovs_header->dp_ifindex);
1566         else {
1567                 struct vport *vport;
1568
1569                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1570                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1571         }
1572         return dp ? dp : ERR_PTR(-ENODEV);
1573 }
1574
1575 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1576 {
1577         struct datapath *dp;
1578
1579         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1580         if (IS_ERR(dp))
1581                 return;
1582
1583         WARN(dp->user_features, "Dropping previously announced user features\n");
1584         dp->user_features = 0;
1585 }
1586
1587 DEFINE_STATIC_KEY_FALSE(tc_recirc_sharing_support);
1588
1589 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1590 {
1591         u32 user_features = 0;
1592
1593         if (a[OVS_DP_ATTR_USER_FEATURES]) {
1594                 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1595
1596                 if (user_features & ~(OVS_DP_F_VPORT_PIDS |
1597                                       OVS_DP_F_UNALIGNED |
1598                                       OVS_DP_F_TC_RECIRC_SHARING))
1599                         return -EOPNOTSUPP;
1600
1601 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1602                 if (user_features & OVS_DP_F_TC_RECIRC_SHARING)
1603                         return -EOPNOTSUPP;
1604 #endif
1605         }
1606
1607         if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) {
1608                 int err;
1609                 u32 cache_size;
1610
1611                 cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]);
1612                 err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size);
1613                 if (err)
1614                         return err;
1615         }
1616
1617         dp->user_features = user_features;
1618
1619         if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING)
1620                 static_branch_enable(&tc_recirc_sharing_support);
1621         else
1622                 static_branch_disable(&tc_recirc_sharing_support);
1623
1624         return 0;
1625 }
1626
1627 static int ovs_dp_stats_init(struct datapath *dp)
1628 {
1629         dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1630         if (!dp->stats_percpu)
1631                 return -ENOMEM;
1632
1633         return 0;
1634 }
1635
1636 static int ovs_dp_vport_init(struct datapath *dp)
1637 {
1638         int i;
1639
1640         dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
1641                                   sizeof(struct hlist_head),
1642                                   GFP_KERNEL);
1643         if (!dp->ports)
1644                 return -ENOMEM;
1645
1646         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1647                 INIT_HLIST_HEAD(&dp->ports[i]);
1648
1649         return 0;
1650 }
1651
1652 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1653 {
1654         struct nlattr **a = info->attrs;
1655         struct vport_parms parms;
1656         struct sk_buff *reply;
1657         struct datapath *dp;
1658         struct vport *vport;
1659         struct ovs_net *ovs_net;
1660         int err;
1661
1662         err = -EINVAL;
1663         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1664                 goto err;
1665
1666         reply = ovs_dp_cmd_alloc_info();
1667         if (!reply)
1668                 return -ENOMEM;
1669
1670         err = -ENOMEM;
1671         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1672         if (dp == NULL)
1673                 goto err_destroy_reply;
1674
1675         ovs_dp_set_net(dp, sock_net(skb->sk));
1676
1677         /* Allocate table. */
1678         err = ovs_flow_tbl_init(&dp->table);
1679         if (err)
1680                 goto err_destroy_dp;
1681
1682         err = ovs_dp_stats_init(dp);
1683         if (err)
1684                 goto err_destroy_table;
1685
1686         err = ovs_dp_vport_init(dp);
1687         if (err)
1688                 goto err_destroy_stats;
1689
1690         err = ovs_meters_init(dp);
1691         if (err)
1692                 goto err_destroy_ports;
1693
1694         /* Set up our datapath device. */
1695         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1696         parms.type = OVS_VPORT_TYPE_INTERNAL;
1697         parms.options = NULL;
1698         parms.dp = dp;
1699         parms.port_no = OVSP_LOCAL;
1700         parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1701
1702         err = ovs_dp_change(dp, a);
1703         if (err)
1704                 goto err_destroy_meters;
1705
1706         /* So far only local changes have been made, now need the lock. */
1707         ovs_lock();
1708
1709         vport = new_vport(&parms);
1710         if (IS_ERR(vport)) {
1711                 err = PTR_ERR(vport);
1712                 if (err == -EBUSY)
1713                         err = -EEXIST;
1714
1715                 if (err == -EEXIST) {
1716                         /* An outdated user space instance that does not understand
1717                          * the concept of user_features has attempted to create a new
1718                          * datapath and is likely to reuse it. Drop all user features.
1719                          */
1720                         if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1721                                 ovs_dp_reset_user_features(skb, info);
1722                 }
1723
1724                 ovs_unlock();
1725                 goto err_destroy_meters;
1726         }
1727
1728         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1729                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1730         BUG_ON(err < 0);
1731
1732         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1733         list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1734
1735         ovs_unlock();
1736
1737         ovs_notify(&dp_datapath_genl_family, reply, info);
1738         return 0;
1739
1740 err_destroy_meters:
1741         ovs_meters_exit(dp);
1742 err_destroy_ports:
1743         kfree(dp->ports);
1744 err_destroy_stats:
1745         free_percpu(dp->stats_percpu);
1746 err_destroy_table:
1747         ovs_flow_tbl_destroy(&dp->table);
1748 err_destroy_dp:
1749         kfree(dp);
1750 err_destroy_reply:
1751         kfree_skb(reply);
1752 err:
1753         return err;
1754 }
1755
1756 /* Called with ovs_mutex. */
1757 static void __dp_destroy(struct datapath *dp)
1758 {
1759         struct flow_table *table = &dp->table;
1760         int i;
1761
1762         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1763                 struct vport *vport;
1764                 struct hlist_node *n;
1765
1766                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1767                         if (vport->port_no != OVSP_LOCAL)
1768                                 ovs_dp_detach_port(vport);
1769         }
1770
1771         list_del_rcu(&dp->list_node);
1772
1773         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1774          * all ports in datapath are destroyed first before freeing datapath.
1775          */
1776         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1777
1778         /* Flush sw_flow in the tables. RCU cb only releases resource
1779          * such as dp, ports and tables. That may avoid some issues
1780          * such as RCU usage warning.
1781          */
1782         table_instance_flow_flush(table, ovsl_dereference(table->ti),
1783                                   ovsl_dereference(table->ufid_ti));
1784
1785         /* RCU destroy the ports, meters and flow tables. */
1786         call_rcu(&dp->rcu, destroy_dp_rcu);
1787 }
1788
1789 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1790 {
1791         struct sk_buff *reply;
1792         struct datapath *dp;
1793         int err;
1794
1795         reply = ovs_dp_cmd_alloc_info();
1796         if (!reply)
1797                 return -ENOMEM;
1798
1799         ovs_lock();
1800         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1801         err = PTR_ERR(dp);
1802         if (IS_ERR(dp))
1803                 goto err_unlock_free;
1804
1805         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1806                                    info->snd_seq, 0, OVS_DP_CMD_DEL);
1807         BUG_ON(err < 0);
1808
1809         __dp_destroy(dp);
1810         ovs_unlock();
1811
1812         ovs_notify(&dp_datapath_genl_family, reply, info);
1813
1814         return 0;
1815
1816 err_unlock_free:
1817         ovs_unlock();
1818         kfree_skb(reply);
1819         return err;
1820 }
1821
1822 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1823 {
1824         struct sk_buff *reply;
1825         struct datapath *dp;
1826         int err;
1827
1828         reply = ovs_dp_cmd_alloc_info();
1829         if (!reply)
1830                 return -ENOMEM;
1831
1832         ovs_lock();
1833         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1834         err = PTR_ERR(dp);
1835         if (IS_ERR(dp))
1836                 goto err_unlock_free;
1837
1838         err = ovs_dp_change(dp, info->attrs);
1839         if (err)
1840                 goto err_unlock_free;
1841
1842         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1843                                    info->snd_seq, 0, OVS_DP_CMD_SET);
1844         BUG_ON(err < 0);
1845
1846         ovs_unlock();
1847         ovs_notify(&dp_datapath_genl_family, reply, info);
1848
1849         return 0;
1850
1851 err_unlock_free:
1852         ovs_unlock();
1853         kfree_skb(reply);
1854         return err;
1855 }
1856
1857 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1858 {
1859         struct sk_buff *reply;
1860         struct datapath *dp;
1861         int err;
1862
1863         reply = ovs_dp_cmd_alloc_info();
1864         if (!reply)
1865                 return -ENOMEM;
1866
1867         ovs_lock();
1868         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1869         if (IS_ERR(dp)) {
1870                 err = PTR_ERR(dp);
1871                 goto err_unlock_free;
1872         }
1873         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1874                                    info->snd_seq, 0, OVS_DP_CMD_GET);
1875         BUG_ON(err < 0);
1876         ovs_unlock();
1877
1878         return genlmsg_reply(reply, info);
1879
1880 err_unlock_free:
1881         ovs_unlock();
1882         kfree_skb(reply);
1883         return err;
1884 }
1885
1886 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1887 {
1888         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1889         struct datapath *dp;
1890         int skip = cb->args[0];
1891         int i = 0;
1892
1893         ovs_lock();
1894         list_for_each_entry(dp, &ovs_net->dps, list_node) {
1895                 if (i >= skip &&
1896                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1897                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1898                                          OVS_DP_CMD_GET) < 0)
1899                         break;
1900                 i++;
1901         }
1902         ovs_unlock();
1903
1904         cb->args[0] = i;
1905
1906         return skb->len;
1907 }
1908
1909 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1910         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1911         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1912         [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1913         [OVS_DP_ATTR_MASKS_CACHE_SIZE] =  NLA_POLICY_RANGE(NLA_U32, 0,
1914                 PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)),
1915 };
1916
1917 static const struct genl_ops dp_datapath_genl_ops[] = {
1918         { .cmd = OVS_DP_CMD_NEW,
1919           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1920           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1921           .doit = ovs_dp_cmd_new
1922         },
1923         { .cmd = OVS_DP_CMD_DEL,
1924           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1925           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1926           .doit = ovs_dp_cmd_del
1927         },
1928         { .cmd = OVS_DP_CMD_GET,
1929           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1930           .flags = 0,               /* OK for unprivileged users. */
1931           .doit = ovs_dp_cmd_get,
1932           .dumpit = ovs_dp_cmd_dump
1933         },
1934         { .cmd = OVS_DP_CMD_SET,
1935           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1936           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1937           .doit = ovs_dp_cmd_set,
1938         },
1939 };
1940
1941 static struct genl_family dp_datapath_genl_family __ro_after_init = {
1942         .hdrsize = sizeof(struct ovs_header),
1943         .name = OVS_DATAPATH_FAMILY,
1944         .version = OVS_DATAPATH_VERSION,
1945         .maxattr = OVS_DP_ATTR_MAX,
1946         .policy = datapath_policy,
1947         .netnsok = true,
1948         .parallel_ops = true,
1949         .ops = dp_datapath_genl_ops,
1950         .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1951         .mcgrps = &ovs_dp_datapath_multicast_group,
1952         .n_mcgrps = 1,
1953         .module = THIS_MODULE,
1954 };
1955
1956 /* Called with ovs_mutex or RCU read lock. */
1957 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1958                                    struct net *net, u32 portid, u32 seq,
1959                                    u32 flags, u8 cmd, gfp_t gfp)
1960 {
1961         struct ovs_header *ovs_header;
1962         struct ovs_vport_stats vport_stats;
1963         int err;
1964
1965         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1966                                  flags, cmd);
1967         if (!ovs_header)
1968                 return -EMSGSIZE;
1969
1970         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1971
1972         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1973             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1974             nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1975                            ovs_vport_name(vport)) ||
1976             nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
1977                 goto nla_put_failure;
1978
1979         if (!net_eq(net, dev_net(vport->dev))) {
1980                 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp);
1981
1982                 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
1983                         goto nla_put_failure;
1984         }
1985
1986         ovs_vport_get_stats(vport, &vport_stats);
1987         if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
1988                           sizeof(struct ovs_vport_stats), &vport_stats,
1989                           OVS_VPORT_ATTR_PAD))
1990                 goto nla_put_failure;
1991
1992         if (ovs_vport_get_upcall_portids(vport, skb))
1993                 goto nla_put_failure;
1994
1995         err = ovs_vport_get_options(vport, skb);
1996         if (err == -EMSGSIZE)
1997                 goto error;
1998
1999         genlmsg_end(skb, ovs_header);
2000         return 0;
2001
2002 nla_put_failure:
2003         err = -EMSGSIZE;
2004 error:
2005         genlmsg_cancel(skb, ovs_header);
2006         return err;
2007 }
2008
2009 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
2010 {
2011         return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2012 }
2013
2014 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
2015 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
2016                                          u32 portid, u32 seq, u8 cmd)
2017 {
2018         struct sk_buff *skb;
2019         int retval;
2020
2021         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2022         if (!skb)
2023                 return ERR_PTR(-ENOMEM);
2024
2025         retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd,
2026                                          GFP_KERNEL);
2027         BUG_ON(retval < 0);
2028
2029         return skb;
2030 }
2031
2032 /* Called with ovs_mutex or RCU read lock. */
2033 static struct vport *lookup_vport(struct net *net,
2034                                   const struct ovs_header *ovs_header,
2035                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2036 {
2037         struct datapath *dp;
2038         struct vport *vport;
2039
2040         if (a[OVS_VPORT_ATTR_IFINDEX])
2041                 return ERR_PTR(-EOPNOTSUPP);
2042         if (a[OVS_VPORT_ATTR_NAME]) {
2043                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
2044                 if (!vport)
2045                         return ERR_PTR(-ENODEV);
2046                 if (ovs_header->dp_ifindex &&
2047                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
2048                         return ERR_PTR(-ENODEV);
2049                 return vport;
2050         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
2051                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2052
2053                 if (port_no >= DP_MAX_PORTS)
2054                         return ERR_PTR(-EFBIG);
2055
2056                 dp = get_dp(net, ovs_header->dp_ifindex);
2057                 if (!dp)
2058                         return ERR_PTR(-ENODEV);
2059
2060                 vport = ovs_vport_ovsl_rcu(dp, port_no);
2061                 if (!vport)
2062                         return ERR_PTR(-ENODEV);
2063                 return vport;
2064         } else
2065                 return ERR_PTR(-EINVAL);
2066
2067 }
2068
2069 static unsigned int ovs_get_max_headroom(struct datapath *dp)
2070 {
2071         unsigned int dev_headroom, max_headroom = 0;
2072         struct net_device *dev;
2073         struct vport *vport;
2074         int i;
2075
2076         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2077                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2078                                         lockdep_ovsl_is_held()) {
2079                         dev = vport->dev;
2080                         dev_headroom = netdev_get_fwd_headroom(dev);
2081                         if (dev_headroom > max_headroom)
2082                                 max_headroom = dev_headroom;
2083                 }
2084         }
2085
2086         return max_headroom;
2087 }
2088
2089 /* Called with ovs_mutex */
2090 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
2091 {
2092         struct vport *vport;
2093         int i;
2094
2095         dp->max_headroom = new_headroom;
2096         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
2097                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2098                                         lockdep_ovsl_is_held())
2099                         netdev_set_rx_headroom(vport->dev, new_headroom);
2100 }
2101
2102 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2103 {
2104         struct nlattr **a = info->attrs;
2105         struct ovs_header *ovs_header = info->userhdr;
2106         struct vport_parms parms;
2107         struct sk_buff *reply;
2108         struct vport *vport;
2109         struct datapath *dp;
2110         unsigned int new_headroom;
2111         u32 port_no;
2112         int err;
2113
2114         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2115             !a[OVS_VPORT_ATTR_UPCALL_PID])
2116                 return -EINVAL;
2117         if (a[OVS_VPORT_ATTR_IFINDEX])
2118                 return -EOPNOTSUPP;
2119
2120         port_no = a[OVS_VPORT_ATTR_PORT_NO]
2121                 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2122         if (port_no >= DP_MAX_PORTS)
2123                 return -EFBIG;
2124
2125         reply = ovs_vport_cmd_alloc_info();
2126         if (!reply)
2127                 return -ENOMEM;
2128
2129         ovs_lock();
2130 restart:
2131         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2132         err = -ENODEV;
2133         if (!dp)
2134                 goto exit_unlock_free;
2135
2136         if (port_no) {
2137                 vport = ovs_vport_ovsl(dp, port_no);
2138                 err = -EBUSY;
2139                 if (vport)
2140                         goto exit_unlock_free;
2141         } else {
2142                 for (port_no = 1; ; port_no++) {
2143                         if (port_no >= DP_MAX_PORTS) {
2144                                 err = -EFBIG;
2145                                 goto exit_unlock_free;
2146                         }
2147                         vport = ovs_vport_ovsl(dp, port_no);
2148                         if (!vport)
2149                                 break;
2150                 }
2151         }
2152
2153         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2154         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2155         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2156         parms.dp = dp;
2157         parms.port_no = port_no;
2158         parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2159
2160         vport = new_vport(&parms);
2161         err = PTR_ERR(vport);
2162         if (IS_ERR(vport)) {
2163                 if (err == -EAGAIN)
2164                         goto restart;
2165                 goto exit_unlock_free;
2166         }
2167
2168         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2169                                       info->snd_portid, info->snd_seq, 0,
2170                                       OVS_VPORT_CMD_NEW, GFP_KERNEL);
2171
2172         new_headroom = netdev_get_fwd_headroom(vport->dev);
2173
2174         if (new_headroom > dp->max_headroom)
2175                 ovs_update_headroom(dp, new_headroom);
2176         else
2177                 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2178
2179         BUG_ON(err < 0);
2180         ovs_unlock();
2181
2182         ovs_notify(&dp_vport_genl_family, reply, info);
2183         return 0;
2184
2185 exit_unlock_free:
2186         ovs_unlock();
2187         kfree_skb(reply);
2188         return err;
2189 }
2190
2191 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2192 {
2193         struct nlattr **a = info->attrs;
2194         struct sk_buff *reply;
2195         struct vport *vport;
2196         int err;
2197
2198         reply = ovs_vport_cmd_alloc_info();
2199         if (!reply)
2200                 return -ENOMEM;
2201
2202         ovs_lock();
2203         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2204         err = PTR_ERR(vport);
2205         if (IS_ERR(vport))
2206                 goto exit_unlock_free;
2207
2208         if (a[OVS_VPORT_ATTR_TYPE] &&
2209             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2210                 err = -EINVAL;
2211                 goto exit_unlock_free;
2212         }
2213
2214         if (a[OVS_VPORT_ATTR_OPTIONS]) {
2215                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2216                 if (err)
2217                         goto exit_unlock_free;
2218         }
2219
2220
2221         if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2222                 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2223
2224                 err = ovs_vport_set_upcall_portids(vport, ids);
2225                 if (err)
2226                         goto exit_unlock_free;
2227         }
2228
2229         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2230                                       info->snd_portid, info->snd_seq, 0,
2231                                       OVS_VPORT_CMD_SET, GFP_KERNEL);
2232         BUG_ON(err < 0);
2233
2234         ovs_unlock();
2235         ovs_notify(&dp_vport_genl_family, reply, info);
2236         return 0;
2237
2238 exit_unlock_free:
2239         ovs_unlock();
2240         kfree_skb(reply);
2241         return err;
2242 }
2243
2244 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2245 {
2246         bool update_headroom = false;
2247         struct nlattr **a = info->attrs;
2248         struct sk_buff *reply;
2249         struct datapath *dp;
2250         struct vport *vport;
2251         unsigned int new_headroom;
2252         int err;
2253
2254         reply = ovs_vport_cmd_alloc_info();
2255         if (!reply)
2256                 return -ENOMEM;
2257
2258         ovs_lock();
2259         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2260         err = PTR_ERR(vport);
2261         if (IS_ERR(vport))
2262                 goto exit_unlock_free;
2263
2264         if (vport->port_no == OVSP_LOCAL) {
2265                 err = -EINVAL;
2266                 goto exit_unlock_free;
2267         }
2268
2269         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2270                                       info->snd_portid, info->snd_seq, 0,
2271                                       OVS_VPORT_CMD_DEL, GFP_KERNEL);
2272         BUG_ON(err < 0);
2273
2274         /* the vport deletion may trigger dp headroom update */
2275         dp = vport->dp;
2276         if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2277                 update_headroom = true;
2278
2279         netdev_reset_rx_headroom(vport->dev);
2280         ovs_dp_detach_port(vport);
2281
2282         if (update_headroom) {
2283                 new_headroom = ovs_get_max_headroom(dp);
2284
2285                 if (new_headroom < dp->max_headroom)
2286                         ovs_update_headroom(dp, new_headroom);
2287         }
2288         ovs_unlock();
2289
2290         ovs_notify(&dp_vport_genl_family, reply, info);
2291         return 0;
2292
2293 exit_unlock_free:
2294         ovs_unlock();
2295         kfree_skb(reply);
2296         return err;
2297 }
2298
2299 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2300 {
2301         struct nlattr **a = info->attrs;
2302         struct ovs_header *ovs_header = info->userhdr;
2303         struct sk_buff *reply;
2304         struct vport *vport;
2305         int err;
2306
2307         reply = ovs_vport_cmd_alloc_info();
2308         if (!reply)
2309                 return -ENOMEM;
2310
2311         rcu_read_lock();
2312         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2313         err = PTR_ERR(vport);
2314         if (IS_ERR(vport))
2315                 goto exit_unlock_free;
2316         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2317                                       info->snd_portid, info->snd_seq, 0,
2318                                       OVS_VPORT_CMD_GET, GFP_ATOMIC);
2319         BUG_ON(err < 0);
2320         rcu_read_unlock();
2321
2322         return genlmsg_reply(reply, info);
2323
2324 exit_unlock_free:
2325         rcu_read_unlock();
2326         kfree_skb(reply);
2327         return err;
2328 }
2329
2330 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2331 {
2332         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2333         struct datapath *dp;
2334         int bucket = cb->args[0], skip = cb->args[1];
2335         int i, j = 0;
2336
2337         rcu_read_lock();
2338         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2339         if (!dp) {
2340                 rcu_read_unlock();
2341                 return -ENODEV;
2342         }
2343         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2344                 struct vport *vport;
2345
2346                 j = 0;
2347                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2348                         if (j >= skip &&
2349                             ovs_vport_cmd_fill_info(vport, skb,
2350                                                     sock_net(skb->sk),
2351                                                     NETLINK_CB(cb->skb).portid,
2352                                                     cb->nlh->nlmsg_seq,
2353                                                     NLM_F_MULTI,
2354                                                     OVS_VPORT_CMD_GET,
2355                                                     GFP_ATOMIC) < 0)
2356                                 goto out;
2357
2358                         j++;
2359                 }
2360                 skip = 0;
2361         }
2362 out:
2363         rcu_read_unlock();
2364
2365         cb->args[0] = i;
2366         cb->args[1] = j;
2367
2368         return skb->len;
2369 }
2370
2371 static void ovs_dp_masks_rebalance(struct work_struct *work)
2372 {
2373         struct ovs_net *ovs_net = container_of(work, struct ovs_net,
2374                                                masks_rebalance.work);
2375         struct datapath *dp;
2376
2377         ovs_lock();
2378
2379         list_for_each_entry(dp, &ovs_net->dps, list_node)
2380                 ovs_flow_masks_rebalance(&dp->table);
2381
2382         ovs_unlock();
2383
2384         schedule_delayed_work(&ovs_net->masks_rebalance,
2385                               msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2386 }
2387
2388 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2389         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2390         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2391         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2392         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2393         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2394         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2395         [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 },
2396         [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2397 };
2398
2399 static const struct genl_ops dp_vport_genl_ops[] = {
2400         { .cmd = OVS_VPORT_CMD_NEW,
2401           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2402           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2403           .doit = ovs_vport_cmd_new
2404         },
2405         { .cmd = OVS_VPORT_CMD_DEL,
2406           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2407           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2408           .doit = ovs_vport_cmd_del
2409         },
2410         { .cmd = OVS_VPORT_CMD_GET,
2411           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2412           .flags = 0,               /* OK for unprivileged users. */
2413           .doit = ovs_vport_cmd_get,
2414           .dumpit = ovs_vport_cmd_dump
2415         },
2416         { .cmd = OVS_VPORT_CMD_SET,
2417           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2418           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2419           .doit = ovs_vport_cmd_set,
2420         },
2421 };
2422
2423 struct genl_family dp_vport_genl_family __ro_after_init = {
2424         .hdrsize = sizeof(struct ovs_header),
2425         .name = OVS_VPORT_FAMILY,
2426         .version = OVS_VPORT_VERSION,
2427         .maxattr = OVS_VPORT_ATTR_MAX,
2428         .policy = vport_policy,
2429         .netnsok = true,
2430         .parallel_ops = true,
2431         .ops = dp_vport_genl_ops,
2432         .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2433         .mcgrps = &ovs_dp_vport_multicast_group,
2434         .n_mcgrps = 1,
2435         .module = THIS_MODULE,
2436 };
2437
2438 static struct genl_family * const dp_genl_families[] = {
2439         &dp_datapath_genl_family,
2440         &dp_vport_genl_family,
2441         &dp_flow_genl_family,
2442         &dp_packet_genl_family,
2443         &dp_meter_genl_family,
2444 #if     IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2445         &dp_ct_limit_genl_family,
2446 #endif
2447 };
2448
2449 static void dp_unregister_genl(int n_families)
2450 {
2451         int i;
2452
2453         for (i = 0; i < n_families; i++)
2454                 genl_unregister_family(dp_genl_families[i]);
2455 }
2456
2457 static int __init dp_register_genl(void)
2458 {
2459         int err;
2460         int i;
2461
2462         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2463
2464                 err = genl_register_family(dp_genl_families[i]);
2465                 if (err)
2466                         goto error;
2467         }
2468
2469         return 0;
2470
2471 error:
2472         dp_unregister_genl(i);
2473         return err;
2474 }
2475
2476 static int __net_init ovs_init_net(struct net *net)
2477 {
2478         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2479
2480         INIT_LIST_HEAD(&ovs_net->dps);
2481         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2482         INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance);
2483         schedule_delayed_work(&ovs_net->masks_rebalance,
2484                               msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2485         return ovs_ct_init(net);
2486 }
2487
2488 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2489                                             struct list_head *head)
2490 {
2491         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2492         struct datapath *dp;
2493
2494         list_for_each_entry(dp, &ovs_net->dps, list_node) {
2495                 int i;
2496
2497                 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2498                         struct vport *vport;
2499
2500                         hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2501                                 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2502                                         continue;
2503
2504                                 if (dev_net(vport->dev) == dnet)
2505                                         list_add(&vport->detach_list, head);
2506                         }
2507                 }
2508         }
2509 }
2510
2511 static void __net_exit ovs_exit_net(struct net *dnet)
2512 {
2513         struct datapath *dp, *dp_next;
2514         struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2515         struct vport *vport, *vport_next;
2516         struct net *net;
2517         LIST_HEAD(head);
2518
2519         ovs_lock();
2520
2521         ovs_ct_exit(dnet);
2522
2523         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2524                 __dp_destroy(dp);
2525
2526         down_read(&net_rwsem);
2527         for_each_net(net)
2528                 list_vports_from_net(net, dnet, &head);
2529         up_read(&net_rwsem);
2530
2531         /* Detach all vports from given namespace. */
2532         list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2533                 list_del(&vport->detach_list);
2534                 ovs_dp_detach_port(vport);
2535         }
2536
2537         ovs_unlock();
2538
2539         cancel_delayed_work_sync(&ovs_net->masks_rebalance);
2540         cancel_work_sync(&ovs_net->dp_notify_work);
2541 }
2542
2543 static struct pernet_operations ovs_net_ops = {
2544         .init = ovs_init_net,
2545         .exit = ovs_exit_net,
2546         .id   = &ovs_net_id,
2547         .size = sizeof(struct ovs_net),
2548 };
2549
2550 static int __init dp_init(void)
2551 {
2552         int err;
2553
2554         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof_field(struct sk_buff, cb));
2555
2556         pr_info("Open vSwitch switching datapath\n");
2557
2558         err = action_fifos_init();
2559         if (err)
2560                 goto error;
2561
2562         err = ovs_internal_dev_rtnl_link_register();
2563         if (err)
2564                 goto error_action_fifos_exit;
2565
2566         err = ovs_flow_init();
2567         if (err)
2568                 goto error_unreg_rtnl_link;
2569
2570         err = ovs_vport_init();
2571         if (err)
2572                 goto error_flow_exit;
2573
2574         err = register_pernet_device(&ovs_net_ops);
2575         if (err)
2576                 goto error_vport_exit;
2577
2578         err = register_netdevice_notifier(&ovs_dp_device_notifier);
2579         if (err)
2580                 goto error_netns_exit;
2581
2582         err = ovs_netdev_init();
2583         if (err)
2584                 goto error_unreg_notifier;
2585
2586         err = dp_register_genl();
2587         if (err < 0)
2588                 goto error_unreg_netdev;
2589
2590         return 0;
2591
2592 error_unreg_netdev:
2593         ovs_netdev_exit();
2594 error_unreg_notifier:
2595         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2596 error_netns_exit:
2597         unregister_pernet_device(&ovs_net_ops);
2598 error_vport_exit:
2599         ovs_vport_exit();
2600 error_flow_exit:
2601         ovs_flow_exit();
2602 error_unreg_rtnl_link:
2603         ovs_internal_dev_rtnl_link_unregister();
2604 error_action_fifos_exit:
2605         action_fifos_exit();
2606 error:
2607         return err;
2608 }
2609
2610 static void dp_cleanup(void)
2611 {
2612         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2613         ovs_netdev_exit();
2614         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2615         unregister_pernet_device(&ovs_net_ops);
2616         rcu_barrier();
2617         ovs_vport_exit();
2618         ovs_flow_exit();
2619         ovs_internal_dev_rtnl_link_unregister();
2620         action_fifos_exit();
2621 }
2622
2623 module_init(dp_init);
2624 module_exit(dp_cleanup);
2625
2626 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2627 MODULE_LICENSE("GPL");
2628 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2629 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2630 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2631 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2632 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
2633 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);