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/kernel.h>
  19 #include <linux/kthread.h>
  20 #include <linux/mutex.h>
  21 #include <linux/percpu.h>
  22 #include <linux/rcupdate.h>
  23 #include <linux/tcp.h>
  24 #include <linux/udp.h>
  25 #include <linux/ethtool.h>
  26 #include <linux/wait.h>
  27 #include <asm/div64.h>
  28 #include <linux/highmem.h>
  29 #include <linux/netfilter_bridge.h>
  30 #include <linux/netfilter_ipv4.h>
  31 #include <linux/inetdevice.h>
  32 #include <linux/list.h>
  33 #include <linux/openvswitch.h>
  34 #include <linux/rculist.h>
  35 #include <linux/dmi.h>
  36 #include <net/genetlink.h>
  37 #include <net/gso.h>
  38 #include <net/net_namespace.h>
  39 #include <net/netns/generic.h>
  40 #include <net/pkt_cls.h>
  41
  42 #include "datapath.h"
  43 #include "drop.h"
  44 #include "flow.h"
  45 #include "flow_table.h"
  46 #include "flow_netlink.h"
  47 #include "meter.h"
  48 #include "openvswitch_trace.h"
  49 #include "vport-internal_dev.h"
  50 #include "vport-netdev.h"
  51
  52 unsigned int ovs_net_id __read_mostly;
  53
  54 static struct genl_family dp_packet_genl_family;
  55 static struct genl_family dp_flow_genl_family;
  56 static struct genl_family dp_datapath_genl_family;
  57
  58 static const struct nla_policy flow_policy[];
  59
  60 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
  61         .name = OVS_FLOW_MCGROUP,
  62 };
  63
  64 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
  65         .name = OVS_DATAPATH_MCGROUP,
  66 };
  67
  68 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
  69         .name = OVS_VPORT_MCGROUP,
  70 };
  71
  72 /* Check if need to build a reply message.
  73  * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
  74 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
  75                             unsigned int group)
  76 {
  77         return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
  78                genl_has_listeners(family, genl_info_net(info), group);
  79 }
  80
  81 static void ovs_notify(struct genl_family *family,
  82                        struct sk_buff *skb, struct genl_info *info)
  83 {
  84         genl_notify(family, skb, info, 0, GFP_KERNEL);
  85 }
  86
  87 /**
  88  * DOC: Locking:
  89  *
  90  * All writes e.g. Writes to device state (add/remove datapath, port, set
  91  * operations on vports, etc.), Writes to other state (flow table
  92  * modifications, set miscellaneous datapath parameters, etc.) are protected
  93  * by ovs_lock.
  94  *
  95  * Reads are protected by RCU.
  96  *
  97  * There are a few special cases (mostly stats) that have their own
  98  * synchronization but they nest under all of above and don't interact with
  99  * each other.
 100  *
 101  * The RTNL lock nests inside ovs_mutex.
 102  */
 103
 104 static DEFINE_MUTEX(ovs_mutex);
 105
 106 void ovs_lock(void)
 107 {
 108         mutex_lock(&ovs_mutex);
 109 }
 110
 111 void ovs_unlock(void)
 112 {
 113         mutex_unlock(&ovs_mutex);
 114 }
 115
 116 #ifdef CONFIG_LOCKDEP
 117 int lockdep_ovsl_is_held(void)
 118 {
 119         if (debug_locks)
 120                 return lockdep_is_held(&ovs_mutex);
 121         else
 122                 return 1;
 123 }
 124 #endif
 125
 126 static struct vport *new_vport(const struct vport_parms *);
 127 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
 128                              const struct sw_flow_key *,
 129                              const struct dp_upcall_info *,
 130                              uint32_t cutlen);
 131 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
 132                                   const struct sw_flow_key *,
 133                                   const struct dp_upcall_info *,
 134                                   uint32_t cutlen);
 135
 136 static void ovs_dp_masks_rebalance(struct work_struct *work);
 137
 138 static int ovs_dp_set_upcall_portids(struct datapath *, const struct nlattr *);
 139
 140 /* Must be called with rcu_read_lock or ovs_mutex. */
 141 const char *ovs_dp_name(const struct datapath *dp)
 142 {
 143         struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
 144         return ovs_vport_name(vport);
 145 }
 146
 147 static int get_dpifindex(const struct datapath *dp)
 148 {
 149         struct vport *local;
 150         int ifindex;
 151
 152         rcu_read_lock();
 153
 154         local = ovs_vport_rcu(dp, OVSP_LOCAL);
 155         if (local)
 156                 ifindex = local->dev->ifindex;
 157         else
 158                 ifindex = 0;
 159
 160         rcu_read_unlock();
 161
 162         return ifindex;
 163 }
 164
 165 static void destroy_dp_rcu(struct rcu_head *rcu)
 166 {
 167         struct datapath *dp = container_of(rcu, struct datapath, rcu);
 168
 169         ovs_flow_tbl_destroy(&dp->table);
 170         free_percpu(dp->stats_percpu);
 171         kfree(dp->ports);
 172         ovs_meters_exit(dp);
 173         kfree(rcu_dereference_raw(dp->upcall_portids));
 174         kfree(dp);
 175 }
 176
 177 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
 178                                             u16 port_no)
 179 {
 180         return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
 181 }
 182
 183 /* Called with ovs_mutex or RCU read lock. */
 184 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
 185 {
 186         struct vport *vport;
 187         struct hlist_head *head;
 188
 189         head = vport_hash_bucket(dp, port_no);
 190         hlist_for_each_entry_rcu(vport, head, dp_hash_node,
 191                                  lockdep_ovsl_is_held()) {
 192                 if (vport->port_no == port_no)
 193                         return vport;
 194         }
 195         return NULL;
 196 }
 197
 198 /* Called with ovs_mutex. */
 199 static struct vport *new_vport(const struct vport_parms *parms)
 200 {
 201         struct vport *vport;
 202
 203         vport = ovs_vport_add(parms);
 204         if (!IS_ERR(vport)) {
 205                 struct datapath *dp = parms->dp;
 206                 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
 207
 208                 hlist_add_head_rcu(&vport->dp_hash_node, head);
 209         }
 210         return vport;
 211 }
 212
 213 static void ovs_vport_update_upcall_stats(struct sk_buff *skb,
 214                                           const struct dp_upcall_info *upcall_info,
 215                                           bool upcall_result)
 216 {
 217         struct vport *p = OVS_CB(skb)->input_vport;
 218         struct vport_upcall_stats_percpu *stats;
 219
 220         if (upcall_info->cmd != OVS_PACKET_CMD_MISS &&
 221             upcall_info->cmd != OVS_PACKET_CMD_ACTION)
 222                 return;
 223
 224         stats = this_cpu_ptr(p->upcall_stats);
 225         u64_stats_update_begin(&stats->syncp);
 226         if (upcall_result)
 227                 u64_stats_inc(&stats->n_success);
 228         else
 229                 u64_stats_inc(&stats->n_fail);
 230         u64_stats_update_end(&stats->syncp);
 231 }
 232
 233 void ovs_dp_detach_port(struct vport *p)
 234 {
 235         ASSERT_OVSL();
 236
 237         /* First drop references to device. */
 238         hlist_del_rcu(&p->dp_hash_node);
 239
 240         /* Then destroy it. */
 241         ovs_vport_del(p);
 242 }
 243
 244 /* Must be called with rcu_read_lock. */
 245 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
 246 {
 247         const struct vport *p = OVS_CB(skb)->input_vport;
 248         struct datapath *dp = p->dp;
 249         struct sw_flow *flow;
 250         struct sw_flow_actions *sf_acts;
 251         struct dp_stats_percpu *stats;
 252         u64 *stats_counter;
 253         u32 n_mask_hit;
 254         u32 n_cache_hit;
 255         int error;
 256
 257         stats = this_cpu_ptr(dp->stats_percpu);
 258
 259         /* Look up flow. */
 260         flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb),
 261                                          &n_mask_hit, &n_cache_hit);
 262         if (unlikely(!flow)) {
 263                 struct dp_upcall_info upcall;
 264
 265                 memset(&upcall, 0, sizeof(upcall));
 266                 upcall.cmd = OVS_PACKET_CMD_MISS;
 267
 268                 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU)
 269                         upcall.portid =
 270                             ovs_dp_get_upcall_portid(dp, smp_processor_id());
 271                 else
 272                         upcall.portid = ovs_vport_find_upcall_portid(p, skb);
 273
 274                 upcall.mru = OVS_CB(skb)->mru;
 275                 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
 276                 switch (error) {
 277                 case 0:
 278                 case -EAGAIN:
 279                 case -ERESTARTSYS:
 280                 case -EINTR:
 281                         consume_skb(skb);
 282                         break;
 283                 default:
 284                         kfree_skb(skb);
 285                         break;
 286                 }
 287                 stats_counter = &stats->n_missed;
 288                 goto out;
 289         }
 290
 291         ovs_flow_stats_update(flow, key->tp.flags, skb);
 292         sf_acts = rcu_dereference(flow->sf_acts);
 293         error = ovs_execute_actions(dp, skb, sf_acts, key);
 294         if (unlikely(error))
 295                 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n",
 296                                     ovs_dp_name(dp), error);
 297
 298         stats_counter = &stats->n_hit;
 299
 300 out:
 301         /* Update datapath statistics. */
 302         u64_stats_update_begin(&stats->syncp);
 303         (*stats_counter)++;
 304         stats->n_mask_hit += n_mask_hit;
 305         stats->n_cache_hit += n_cache_hit;
 306         u64_stats_update_end(&stats->syncp);
 307 }
 308
 309 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
 310                   const struct sw_flow_key *key,
 311                   const struct dp_upcall_info *upcall_info,
 312                   uint32_t cutlen)
 313 {
 314         struct dp_stats_percpu *stats;
 315         int err;
 316
 317         if (trace_ovs_dp_upcall_enabled())
 318                 trace_ovs_dp_upcall(dp, skb, key, upcall_info);
 319
 320         if (upcall_info->portid == 0) {
 321                 err = -ENOTCONN;
 322                 goto err;
 323         }
 324
 325         if (!skb_is_gso(skb))
 326                 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
 327         else
 328                 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
 329
 330         ovs_vport_update_upcall_stats(skb, upcall_info, !err);
 331         if (err)
 332                 goto err;
 333
 334         return 0;
 335
 336 err:
 337         stats = this_cpu_ptr(dp->stats_percpu);
 338
 339         u64_stats_update_begin(&stats->syncp);
 340         stats->n_lost++;
 341         u64_stats_update_end(&stats->syncp);
 342
 343         return err;
 344 }
 345
 346 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
 347                              const struct sw_flow_key *key,
 348                              const struct dp_upcall_info *upcall_info,
 349                              uint32_t cutlen)
 350 {
 351         unsigned int gso_type = skb_shinfo(skb)->gso_type;
 352         struct sw_flow_key later_key;
 353         struct sk_buff *segs, *nskb;
 354         int err;
 355
 356         BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET);
 357         segs = __skb_gso_segment(skb, NETIF_F_SG, false);
 358         if (IS_ERR(segs))
 359                 return PTR_ERR(segs);
 360         if (segs == NULL)
 361                 return -EINVAL;
 362
 363         if (gso_type & SKB_GSO_UDP) {
 364                 /* The initial flow key extracted by ovs_flow_key_extract()
 365                  * in this case is for a first fragment, so we need to
 366                  * properly mark later fragments.
 367                  */
 368                 later_key = *key;
 369                 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
 370         }
 371
 372         /* Queue all of the segments. */
 373         skb_list_walk_safe(segs, skb, nskb) {
 374                 if (gso_type & SKB_GSO_UDP && skb != segs)
 375                         key = &later_key;
 376
 377                 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
 378                 if (err)
 379                         break;
 380
 381         }
 382
 383         /* Free all of the segments. */
 384         skb_list_walk_safe(segs, skb, nskb) {
 385                 if (err)
 386                         kfree_skb(skb);
 387                 else
 388                         consume_skb(skb);
 389         }
 390         return err;
 391 }
 392
 393 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
 394                               unsigned int hdrlen, int actions_attrlen)
 395 {
 396         size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
 397                 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
 398                 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
 399                 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */
 400                 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */
 401
 402         /* OVS_PACKET_ATTR_USERDATA */
 403         if (upcall_info->userdata)
 404                 size += NLA_ALIGN(upcall_info->userdata->nla_len);
 405
 406         /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
 407         if (upcall_info->egress_tun_info)
 408                 size += nla_total_size(ovs_tun_key_attr_size());
 409
 410         /* OVS_PACKET_ATTR_ACTIONS */
 411         if (upcall_info->actions_len)
 412                 size += nla_total_size(actions_attrlen);
 413
 414         /* OVS_PACKET_ATTR_MRU */
 415         if (upcall_info->mru)
 416                 size += nla_total_size(sizeof(upcall_info->mru));
 417
 418         return size;
 419 }
 420
 421 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
 422 {
 423         if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
 424                 size_t plen = NLA_ALIGN(skb->len) - skb->len;
 425
 426                 if (plen > 0)
 427                         skb_put_zero(skb, plen);
 428         }
 429 }
 430
 431 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
 432                                   const struct sw_flow_key *key,
 433                                   const struct dp_upcall_info *upcall_info,
 434                                   uint32_t cutlen)
 435 {
 436         struct ovs_header *upcall;
 437         struct sk_buff *nskb = NULL;
 438         struct sk_buff *user_skb = NULL; /* to be queued to userspace */
 439         struct nlattr *nla;
 440         size_t len;
 441         unsigned int hlen;
 442         int err, dp_ifindex;
 443         u64 hash;
 444
 445         dp_ifindex = get_dpifindex(dp);
 446         if (!dp_ifindex)
 447                 return -ENODEV;
 448
 449         if (skb_vlan_tag_present(skb)) {
 450                 nskb = skb_clone(skb, GFP_ATOMIC);
 451                 if (!nskb)
 452                         return -ENOMEM;
 453
 454                 nskb = __vlan_hwaccel_push_inside(nskb);
 455                 if (!nskb)
 456                         return -ENOMEM;
 457
 458                 skb = nskb;
 459         }
 460
 461         if (nla_attr_size(skb->len) > USHRT_MAX) {
 462                 err = -EFBIG;
 463                 goto out;
 464         }
 465
 466         /* Complete checksum if needed */
 467         if (skb->ip_summed == CHECKSUM_PARTIAL &&
 468             (err = skb_csum_hwoffload_help(skb, 0)))
 469                 goto out;
 470
 471         /* Older versions of OVS user space enforce alignment of the last
 472          * Netlink attribute to NLA_ALIGNTO which would require extensive
 473          * padding logic. Only perform zerocopy if padding is not required.
 474          */
 475         if (dp->user_features & OVS_DP_F_UNALIGNED)
 476                 hlen = skb_zerocopy_headlen(skb);
 477         else
 478                 hlen = skb->len;
 479
 480         len = upcall_msg_size(upcall_info, hlen - cutlen,
 481                               OVS_CB(skb)->acts_origlen);
 482         user_skb = genlmsg_new(len, GFP_ATOMIC);
 483         if (!user_skb) {
 484                 err = -ENOMEM;
 485                 goto out;
 486         }
 487
 488         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
 489                              0, upcall_info->cmd);
 490         if (!upcall) {
 491                 err = -EINVAL;
 492                 goto out;
 493         }
 494         upcall->dp_ifindex = dp_ifindex;
 495
 496         err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
 497         if (err)
 498                 goto out;
 499
 500         if (upcall_info->userdata)
 501                 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
 502                           nla_len(upcall_info->userdata),
 503                           nla_data(upcall_info->userdata));
 504
 505         if (upcall_info->egress_tun_info) {
 506                 nla = nla_nest_start_noflag(user_skb,
 507                                             OVS_PACKET_ATTR_EGRESS_TUN_KEY);
 508                 if (!nla) {
 509                         err = -EMSGSIZE;
 510                         goto out;
 511                 }
 512                 err = ovs_nla_put_tunnel_info(user_skb,
 513                                               upcall_info->egress_tun_info);
 514                 if (err)
 515                         goto out;
 516
 517                 nla_nest_end(user_skb, nla);
 518         }
 519
 520         if (upcall_info->actions_len) {
 521                 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS);
 522                 if (!nla) {
 523                         err = -EMSGSIZE;
 524                         goto out;
 525                 }
 526                 err = ovs_nla_put_actions(upcall_info->actions,
 527                                           upcall_info->actions_len,
 528                                           user_skb);
 529                 if (!err)
 530                         nla_nest_end(user_skb, nla);
 531                 else
 532                         nla_nest_cancel(user_skb, nla);
 533         }
 534
 535         /* Add OVS_PACKET_ATTR_MRU */
 536         if (upcall_info->mru &&
 537             nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) {
 538                 err = -ENOBUFS;
 539                 goto out;
 540         }
 541
 542         /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
 543         if (cutlen > 0 &&
 544             nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) {
 545                 err = -ENOBUFS;
 546                 goto out;
 547         }
 548
 549         /* Add OVS_PACKET_ATTR_HASH */
 550         hash = skb_get_hash_raw(skb);
 551         if (skb->sw_hash)
 552                 hash |= OVS_PACKET_HASH_SW_BIT;
 553
 554         if (skb->l4_hash)
 555                 hash |= OVS_PACKET_HASH_L4_BIT;
 556
 557         if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) {
 558                 err = -ENOBUFS;
 559                 goto out;
 560         }
 561
 562         /* Only reserve room for attribute header, packet data is added
 563          * in skb_zerocopy() */
 564         if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
 565                 err = -ENOBUFS;
 566                 goto out;
 567         }
 568         nla->nla_len = nla_attr_size(skb->len - cutlen);
 569
 570         err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
 571         if (err)
 572                 goto out;
 573
 574         /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
 575         pad_packet(dp, user_skb);
 576
 577         ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
 578
 579         err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
 580         user_skb = NULL;
 581 out:
 582         if (err)
 583                 skb_tx_error(skb);
 584         consume_skb(user_skb);
 585         consume_skb(nskb);
 586
 587         return err;
 588 }
 589
 590 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 591 {
 592         struct ovs_header *ovs_header = genl_info_userhdr(info);
 593         struct net *net = sock_net(skb->sk);
 594         struct nlattr **a = info->attrs;
 595         struct sw_flow_actions *acts;
 596         struct sk_buff *packet;
 597         struct sw_flow *flow;
 598         struct sw_flow_actions *sf_acts;
 599         struct datapath *dp;
 600         struct vport *input_vport;
 601         u16 mru = 0;
 602         u64 hash;
 603         int len;
 604         int err;
 605         bool log = !a[OVS_PACKET_ATTR_PROBE];
 606
 607         err = -EINVAL;
 608         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
 609             !a[OVS_PACKET_ATTR_ACTIONS])
 610                 goto err;
 611
 612         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
 613         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
 614         err = -ENOMEM;
 615         if (!packet)
 616                 goto err;
 617         skb_reserve(packet, NET_IP_ALIGN);
 618
 619         nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
 620
 621         /* Set packet's mru */
 622         if (a[OVS_PACKET_ATTR_MRU]) {
 623                 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
 624                 packet->ignore_df = 1;
 625         }
 626         OVS_CB(packet)->mru = mru;
 627
 628         if (a[OVS_PACKET_ATTR_HASH]) {
 629                 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]);
 630
 631                 __skb_set_hash(packet, hash & 0xFFFFFFFFULL,
 632                                !!(hash & OVS_PACKET_HASH_SW_BIT),
 633                                !!(hash & OVS_PACKET_HASH_L4_BIT));
 634         }
 635
 636         /* Build an sw_flow for sending this packet. */
 637         flow = ovs_flow_alloc();
 638         err = PTR_ERR(flow);
 639         if (IS_ERR(flow))
 640                 goto err_kfree_skb;
 641
 642         err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
 643                                              packet, &flow->key, log);
 644         if (err)
 645                 goto err_flow_free;
 646
 647         err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
 648                                    &flow->key, &acts, log);
 649         if (err)
 650                 goto err_flow_free;
 651
 652         rcu_assign_pointer(flow->sf_acts, acts);
 653         packet->priority = flow->key.phy.priority;
 654         packet->mark = flow->key.phy.skb_mark;
 655
 656         rcu_read_lock();
 657         dp = get_dp_rcu(net, ovs_header->dp_ifindex);
 658         err = -ENODEV;
 659         if (!dp)
 660                 goto err_unlock;
 661
 662         input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
 663         if (!input_vport)
 664                 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
 665
 666         if (!input_vport)
 667                 goto err_unlock;
 668
 669         packet->dev = input_vport->dev;
 670         OVS_CB(packet)->input_vport = input_vport;
 671         sf_acts = rcu_dereference(flow->sf_acts);
 672
 673         local_bh_disable();
 674         err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
 675         local_bh_enable();
 676         rcu_read_unlock();
 677
 678         ovs_flow_free(flow, false);
 679         return err;
 680
 681 err_unlock:
 682         rcu_read_unlock();
 683 err_flow_free:
 684         ovs_flow_free(flow, false);
 685 err_kfree_skb:
 686         kfree_skb(packet);
 687 err:
 688         return err;
 689 }
 690
 691 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
 692         [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
 693         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
 694         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
 695         [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
 696         [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
 697         [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 },
 698 };
 699
 700 static const struct genl_small_ops dp_packet_genl_ops[] = {
 701         { .cmd = OVS_PACKET_CMD_EXECUTE,
 702           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
 703           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
 704           .doit = ovs_packet_cmd_execute
 705         }
 706 };
 707
 708 static struct genl_family dp_packet_genl_family __ro_after_init = {
 709         .hdrsize = sizeof(struct ovs_header),
 710         .name = OVS_PACKET_FAMILY,
 711         .version = OVS_PACKET_VERSION,
 712         .maxattr = OVS_PACKET_ATTR_MAX,
 713         .policy = packet_policy,
 714         .netnsok = true,
 715         .parallel_ops = true,
 716         .small_ops = dp_packet_genl_ops,
 717         .n_small_ops = ARRAY_SIZE(dp_packet_genl_ops),
 718         .resv_start_op = OVS_PACKET_CMD_EXECUTE + 1,
 719         .module = THIS_MODULE,
 720 };
 721
 722 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
 723                          struct ovs_dp_megaflow_stats *mega_stats)
 724 {
 725         int i;
 726
 727         memset(mega_stats, 0, sizeof(*mega_stats));
 728
 729         stats->n_flows = ovs_flow_tbl_count(&dp->table);
 730         mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
 731
 732         stats->n_hit = stats->n_missed = stats->n_lost = 0;
 733
 734         for_each_possible_cpu(i) {
 735                 const struct dp_stats_percpu *percpu_stats;
 736                 struct dp_stats_percpu local_stats;
 737                 unsigned int start;
 738
 739                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
 740
 741                 do {
 742                         start = u64_stats_fetch_begin(&percpu_stats->syncp);
 743                         local_stats = *percpu_stats;
 744                 } while (u64_stats_fetch_retry(&percpu_stats->syncp, start));
 745
 746                 stats->n_hit += local_stats.n_hit;
 747                 stats->n_missed += local_stats.n_missed;
 748                 stats->n_lost += local_stats.n_lost;
 749                 mega_stats->n_mask_hit += local_stats.n_mask_hit;
 750                 mega_stats->n_cache_hit += local_stats.n_cache_hit;
 751         }
 752 }
 753
 754 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
 755 {
 756         return ovs_identifier_is_ufid(sfid) &&
 757                !(ufid_flags & OVS_UFID_F_OMIT_KEY);
 758 }
 759
 760 static bool should_fill_mask(uint32_t ufid_flags)
 761 {
 762         return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
 763 }
 764
 765 static bool should_fill_actions(uint32_t ufid_flags)
 766 {
 767         return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
 768 }
 769
 770 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
 771                                     const struct sw_flow_id *sfid,
 772                                     uint32_t ufid_flags)
 773 {
 774         size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
 775
 776         /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
 777          * see ovs_nla_put_identifier()
 778          */
 779         if (sfid && ovs_identifier_is_ufid(sfid))
 780                 len += nla_total_size(sfid->ufid_len);
 781         else
 782                 len += nla_total_size(ovs_key_attr_size());
 783
 784         /* OVS_FLOW_ATTR_KEY */
 785         if (!sfid || should_fill_key(sfid, ufid_flags))
 786                 len += nla_total_size(ovs_key_attr_size());
 787
 788         /* OVS_FLOW_ATTR_MASK */
 789         if (should_fill_mask(ufid_flags))
 790                 len += nla_total_size(ovs_key_attr_size());
 791
 792         /* OVS_FLOW_ATTR_ACTIONS */
 793         if (should_fill_actions(ufid_flags))
 794                 len += nla_total_size(acts->orig_len);
 795
 796         return len
 797                 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
 798                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
 799                 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
 800 }
 801
 802 /* Called with ovs_mutex or RCU read lock. */
 803 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
 804                                    struct sk_buff *skb)
 805 {
 806         struct ovs_flow_stats stats;
 807         __be16 tcp_flags;
 808         unsigned long used;
 809
 810         ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
 811
 812         if (used &&
 813             nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
 814                               OVS_FLOW_ATTR_PAD))
 815                 return -EMSGSIZE;
 816
 817         if (stats.n_packets &&
 818             nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
 819                           sizeof(struct ovs_flow_stats), &stats,
 820                           OVS_FLOW_ATTR_PAD))
 821                 return -EMSGSIZE;
 822
 823         if ((u8)ntohs(tcp_flags) &&
 824              nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
 825                 return -EMSGSIZE;
 826
 827         return 0;
 828 }
 829
 830 /* Called with ovs_mutex or RCU read lock. */
 831 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
 832                                      struct sk_buff *skb, int skb_orig_len)
 833 {
 834         struct nlattr *start;
 835         int err;
 836
 837         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
 838          * this is the first flow to be dumped into 'skb'.  This is unusual for
 839          * Netlink but individual action lists can be longer than
 840          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
 841          * The userspace caller can always fetch the actions separately if it
 842          * really wants them.  (Most userspace callers in fact don't care.)
 843          *
 844          * This can only fail for dump operations because the skb is always
 845          * properly sized for single flows.
 846          */
 847         start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS);
 848         if (start) {
 849                 const struct sw_flow_actions *sf_acts;
 850
 851                 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
 852                 err = ovs_nla_put_actions(sf_acts->actions,
 853                                           sf_acts->actions_len, skb);
 854
 855                 if (!err)
 856                         nla_nest_end(skb, start);
 857                 else {
 858                         if (skb_orig_len)
 859                                 return err;
 860
 861                         nla_nest_cancel(skb, start);
 862                 }
 863         } else if (skb_orig_len) {
 864                 return -EMSGSIZE;
 865         }
 866
 867         return 0;
 868 }
 869
 870 /* Called with ovs_mutex or RCU read lock. */
 871 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
 872                                   struct sk_buff *skb, u32 portid,
 873                                   u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
 874 {
 875         const int skb_orig_len = skb->len;
 876         struct ovs_header *ovs_header;
 877         int err;
 878
 879         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
 880                                  flags, cmd);
 881         if (!ovs_header)
 882                 return -EMSGSIZE;
 883
 884         ovs_header->dp_ifindex = dp_ifindex;
 885
 886         err = ovs_nla_put_identifier(flow, skb);
 887         if (err)
 888                 goto error;
 889
 890         if (should_fill_key(&flow->id, ufid_flags)) {
 891                 err = ovs_nla_put_masked_key(flow, skb);
 892                 if (err)
 893                         goto error;
 894         }
 895
 896         if (should_fill_mask(ufid_flags)) {
 897                 err = ovs_nla_put_mask(flow, skb);
 898                 if (err)
 899                         goto error;
 900         }
 901
 902         err = ovs_flow_cmd_fill_stats(flow, skb);
 903         if (err)
 904                 goto error;
 905
 906         if (should_fill_actions(ufid_flags)) {
 907                 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
 908                 if (err)
 909                         goto error;
 910         }
 911
 912         genlmsg_end(skb, ovs_header);
 913         return 0;
 914
 915 error:
 916         genlmsg_cancel(skb, ovs_header);
 917         return err;
 918 }
 919
 920 /* May not be called with RCU read lock. */
 921 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
 922                                                const struct sw_flow_id *sfid,
 923                                                struct genl_info *info,
 924                                                bool always,
 925                                                uint32_t ufid_flags)
 926 {
 927         struct sk_buff *skb;
 928         size_t len;
 929
 930         if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
 931                 return NULL;
 932
 933         len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
 934         skb = genlmsg_new(len, GFP_KERNEL);
 935         if (!skb)
 936                 return ERR_PTR(-ENOMEM);
 937
 938         return skb;
 939 }
 940
 941 /* Called with ovs_mutex. */
 942 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
 943                                                int dp_ifindex,
 944                                                struct genl_info *info, u8 cmd,
 945                                                bool always, u32 ufid_flags)
 946 {
 947         struct sk_buff *skb;
 948         int retval;
 949
 950         skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
 951                                       &flow->id, info, always, ufid_flags);
 952         if (IS_ERR_OR_NULL(skb))
 953                 return skb;
 954
 955         retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
 956                                         info->snd_portid, info->snd_seq, 0,
 957                                         cmd, ufid_flags);
 958         if (WARN_ON_ONCE(retval < 0)) {
 959                 kfree_skb(skb);
 960                 skb = ERR_PTR(retval);
 961         }
 962         return skb;
 963 }
 964
 965 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
 966 {
 967         struct net *net = sock_net(skb->sk);
 968         struct nlattr **a = info->attrs;
 969         struct ovs_header *ovs_header = genl_info_userhdr(info);
 970         struct sw_flow *flow = NULL, *new_flow;
 971         struct sw_flow_mask mask;
 972         struct sk_buff *reply;
 973         struct datapath *dp;
 974         struct sw_flow_key *key;
 975         struct sw_flow_actions *acts;
 976         struct sw_flow_match match;
 977         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
 978         int error;
 979         bool log = !a[OVS_FLOW_ATTR_PROBE];
 980
 981         /* Must have key and actions. */
 982         error = -EINVAL;
 983         if (!a[OVS_FLOW_ATTR_KEY]) {
 984                 OVS_NLERR(log, "Flow key attr not present in new flow.");
 985                 goto error;
 986         }
 987         if (!a[OVS_FLOW_ATTR_ACTIONS]) {
 988                 OVS_NLERR(log, "Flow actions attr not present in new flow.");
 989                 goto error;
 990         }
 991
 992         /* Most of the time we need to allocate a new flow, do it before
 993          * locking.
 994          */
 995         new_flow = ovs_flow_alloc();
 996         if (IS_ERR(new_flow)) {
 997                 error = PTR_ERR(new_flow);
 998                 goto error;
 999         }
1000
1001         /* Extract key. */
1002         key = kzalloc(sizeof(*key), GFP_KERNEL);
1003         if (!key) {
1004                 error = -ENOMEM;
1005                 goto err_kfree_flow;
1006         }
1007
1008         ovs_match_init(&match, key, false, &mask);
1009         error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1010                                   a[OVS_FLOW_ATTR_MASK], log);
1011         if (error)
1012                 goto err_kfree_key;
1013
1014         ovs_flow_mask_key(&new_flow->key, key, true, &mask);
1015
1016         /* Extract flow identifier. */
1017         error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
1018                                        key, log);
1019         if (error)
1020                 goto err_kfree_key;
1021
1022         /* Validate actions. */
1023         error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
1024                                      &new_flow->key, &acts, log);
1025         if (error) {
1026                 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
1027                 goto err_kfree_key;
1028         }
1029
1030         reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
1031                                         ufid_flags);
1032         if (IS_ERR(reply)) {
1033                 error = PTR_ERR(reply);
1034                 goto err_kfree_acts;
1035         }
1036
1037         ovs_lock();
1038         dp = get_dp(net, ovs_header->dp_ifindex);
1039         if (unlikely(!dp)) {
1040                 error = -ENODEV;
1041                 goto err_unlock_ovs;
1042         }
1043
1044         /* Check if this is a duplicate flow */
1045         if (ovs_identifier_is_ufid(&new_flow->id))
1046                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
1047         if (!flow)
1048                 flow = ovs_flow_tbl_lookup(&dp->table, key);
1049         if (likely(!flow)) {
1050                 rcu_assign_pointer(new_flow->sf_acts, acts);
1051
1052                 /* Put flow in bucket. */
1053                 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
1054                 if (unlikely(error)) {
1055                         acts = NULL;
1056                         goto err_unlock_ovs;
1057                 }
1058
1059                 if (unlikely(reply)) {
1060                         error = ovs_flow_cmd_fill_info(new_flow,
1061                                                        ovs_header->dp_ifindex,
1062                                                        reply, info->snd_portid,
1063                                                        info->snd_seq, 0,
1064                                                        OVS_FLOW_CMD_NEW,
1065                                                        ufid_flags);
1066                         BUG_ON(error < 0);
1067                 }
1068                 ovs_unlock();
1069         } else {
1070                 struct sw_flow_actions *old_acts;
1071
1072                 /* Bail out if we're not allowed to modify an existing flow.
1073                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1074                  * because Generic Netlink treats the latter as a dump
1075                  * request.  We also accept NLM_F_EXCL in case that bug ever
1076                  * gets fixed.
1077                  */
1078                 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1079                                                          | NLM_F_EXCL))) {
1080                         error = -EEXIST;
1081                         goto err_unlock_ovs;
1082                 }
1083                 /* The flow identifier has to be the same for flow updates.
1084                  * Look for any overlapping flow.
1085                  */
1086                 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1087                         if (ovs_identifier_is_key(&flow->id))
1088                                 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1089                                                                  &match);
1090                         else /* UFID matches but key is different */
1091                                 flow = NULL;
1092                         if (!flow) {
1093                                 error = -ENOENT;
1094                                 goto err_unlock_ovs;
1095                         }
1096                 }
1097                 /* Update actions. */
1098                 old_acts = ovsl_dereference(flow->sf_acts);
1099                 rcu_assign_pointer(flow->sf_acts, acts);
1100
1101                 if (unlikely(reply)) {
1102                         error = ovs_flow_cmd_fill_info(flow,
1103                                                        ovs_header->dp_ifindex,
1104                                                        reply, info->snd_portid,
1105                                                        info->snd_seq, 0,
1106                                                        OVS_FLOW_CMD_NEW,
1107                                                        ufid_flags);
1108                         BUG_ON(error < 0);
1109                 }
1110                 ovs_unlock();
1111
1112                 ovs_nla_free_flow_actions_rcu(old_acts);
1113                 ovs_flow_free(new_flow, false);
1114         }
1115
1116         if (reply)
1117                 ovs_notify(&dp_flow_genl_family, reply, info);
1118
1119         kfree(key);
1120         return 0;
1121
1122 err_unlock_ovs:
1123         ovs_unlock();
1124         kfree_skb(reply);
1125 err_kfree_acts:
1126         ovs_nla_free_flow_actions(acts);
1127 err_kfree_key:
1128         kfree(key);
1129 err_kfree_flow:
1130         ovs_flow_free(new_flow, false);
1131 error:
1132         return error;
1133 }
1134
1135 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1136 static noinline_for_stack
1137 struct sw_flow_actions *get_flow_actions(struct net *net,
1138                                          const struct nlattr *a,
1139                                          const struct sw_flow_key *key,
1140                                          const struct sw_flow_mask *mask,
1141                                          bool log)
1142 {
1143         struct sw_flow_actions *acts;
1144         struct sw_flow_key masked_key;
1145         int error;
1146
1147         ovs_flow_mask_key(&masked_key, key, true, mask);
1148         error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1149         if (error) {
1150                 OVS_NLERR(log,
1151                           "Actions may not be safe on all matching packets");
1152                 return ERR_PTR(error);
1153         }
1154
1155         return acts;
1156 }
1157
1158 /* Factor out match-init and action-copy to avoid
1159  * "Wframe-larger-than=1024" warning. Because mask is only
1160  * used to get actions, we new a function to save some
1161  * stack space.
1162  *
1163  * If there are not key and action attrs, we return 0
1164  * directly. In the case, the caller will also not use the
1165  * match as before. If there is action attr, we try to get
1166  * actions and save them to *acts. Before returning from
1167  * the function, we reset the match->mask pointer. Because
1168  * we should not to return match object with dangling reference
1169  * to mask.
1170  * */
1171 static noinline_for_stack int
1172 ovs_nla_init_match_and_action(struct net *net,
1173                               struct sw_flow_match *match,
1174                               struct sw_flow_key *key,
1175                               struct nlattr **a,
1176                               struct sw_flow_actions **acts,
1177                               bool log)
1178 {
1179         struct sw_flow_mask mask;
1180         int error = 0;
1181
1182         if (a[OVS_FLOW_ATTR_KEY]) {
1183                 ovs_match_init(match, key, true, &mask);
1184                 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1185                                           a[OVS_FLOW_ATTR_MASK], log);
1186                 if (error)
1187                         goto error;
1188         }
1189
1190         if (a[OVS_FLOW_ATTR_ACTIONS]) {
1191                 if (!a[OVS_FLOW_ATTR_KEY]) {
1192                         OVS_NLERR(log,
1193                                   "Flow key attribute not present in set flow.");
1194                         error = -EINVAL;
1195                         goto error;
1196                 }
1197
1198                 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1199                                          &mask, log);
1200                 if (IS_ERR(*acts)) {
1201                         error = PTR_ERR(*acts);
1202                         goto error;
1203                 }
1204         }
1205
1206         /* On success, error is 0. */
1207 error:
1208         match->mask = NULL;
1209         return error;
1210 }
1211
1212 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1213 {
1214         struct net *net = sock_net(skb->sk);
1215         struct nlattr **a = info->attrs;
1216         struct ovs_header *ovs_header = genl_info_userhdr(info);
1217         struct sw_flow_key key;
1218         struct sw_flow *flow;
1219         struct sk_buff *reply = NULL;
1220         struct datapath *dp;
1221         struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1222         struct sw_flow_match match;
1223         struct sw_flow_id sfid;
1224         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1225         int error = 0;
1226         bool log = !a[OVS_FLOW_ATTR_PROBE];
1227         bool ufid_present;
1228
1229         ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1230         if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1231                 OVS_NLERR(log,
1232                           "Flow set message rejected, Key attribute missing.");
1233                 return -EINVAL;
1234         }
1235
1236         error = ovs_nla_init_match_and_action(net, &match, &key, a,
1237                                               &acts, log);
1238         if (error)
1239                 goto error;
1240
1241         if (acts) {
1242                 /* Can allocate before locking if have acts. */
1243                 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1244                                                 ufid_flags);
1245                 if (IS_ERR(reply)) {
1246                         error = PTR_ERR(reply);
1247                         goto err_kfree_acts;
1248                 }
1249         }
1250
1251         ovs_lock();
1252         dp = get_dp(net, ovs_header->dp_ifindex);
1253         if (unlikely(!dp)) {
1254                 error = -ENODEV;
1255                 goto err_unlock_ovs;
1256         }
1257         /* Check that the flow exists. */
1258         if (ufid_present)
1259                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1260         else
1261                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1262         if (unlikely(!flow)) {
1263                 error = -ENOENT;
1264                 goto err_unlock_ovs;
1265         }
1266
1267         /* Update actions, if present. */
1268         if (likely(acts)) {
1269                 old_acts = ovsl_dereference(flow->sf_acts);
1270                 rcu_assign_pointer(flow->sf_acts, acts);
1271
1272                 if (unlikely(reply)) {
1273                         error = ovs_flow_cmd_fill_info(flow,
1274                                                        ovs_header->dp_ifindex,
1275                                                        reply, info->snd_portid,
1276                                                        info->snd_seq, 0,
1277                                                        OVS_FLOW_CMD_SET,
1278                                                        ufid_flags);
1279                         BUG_ON(error < 0);
1280                 }
1281         } else {
1282                 /* Could not alloc without acts before locking. */
1283                 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1284                                                 info, OVS_FLOW_CMD_SET, false,
1285                                                 ufid_flags);
1286
1287                 if (IS_ERR(reply)) {
1288                         error = PTR_ERR(reply);
1289                         goto err_unlock_ovs;
1290                 }
1291         }
1292
1293         /* Clear stats. */
1294         if (a[OVS_FLOW_ATTR_CLEAR])
1295                 ovs_flow_stats_clear(flow);
1296         ovs_unlock();
1297
1298         if (reply)
1299                 ovs_notify(&dp_flow_genl_family, reply, info);
1300         if (old_acts)
1301                 ovs_nla_free_flow_actions_rcu(old_acts);
1302
1303         return 0;
1304
1305 err_unlock_ovs:
1306         ovs_unlock();
1307         kfree_skb(reply);
1308 err_kfree_acts:
1309         ovs_nla_free_flow_actions(acts);
1310 error:
1311         return error;
1312 }
1313
1314 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1315 {
1316         struct nlattr **a = info->attrs;
1317         struct ovs_header *ovs_header = genl_info_userhdr(info);
1318         struct net *net = sock_net(skb->sk);
1319         struct sw_flow_key key;
1320         struct sk_buff *reply;
1321         struct sw_flow *flow;
1322         struct datapath *dp;
1323         struct sw_flow_match match;
1324         struct sw_flow_id ufid;
1325         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1326         int err = 0;
1327         bool log = !a[OVS_FLOW_ATTR_PROBE];
1328         bool ufid_present;
1329
1330         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1331         if (a[OVS_FLOW_ATTR_KEY]) {
1332                 ovs_match_init(&match, &key, true, NULL);
1333                 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1334                                         log);
1335         } else if (!ufid_present) {
1336                 OVS_NLERR(log,
1337                           "Flow get message rejected, Key attribute missing.");
1338                 err = -EINVAL;
1339         }
1340         if (err)
1341                 return err;
1342
1343         ovs_lock();
1344         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1345         if (!dp) {
1346                 err = -ENODEV;
1347                 goto unlock;
1348         }
1349
1350         if (ufid_present)
1351                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1352         else
1353                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1354         if (!flow) {
1355                 err = -ENOENT;
1356                 goto unlock;
1357         }
1358
1359         reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1360                                         OVS_FLOW_CMD_GET, true, ufid_flags);
1361         if (IS_ERR(reply)) {
1362                 err = PTR_ERR(reply);
1363                 goto unlock;
1364         }
1365
1366         ovs_unlock();
1367         return genlmsg_reply(reply, info);
1368 unlock:
1369         ovs_unlock();
1370         return err;
1371 }
1372
1373 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1374 {
1375         struct nlattr **a = info->attrs;
1376         struct ovs_header *ovs_header = genl_info_userhdr(info);
1377         struct net *net = sock_net(skb->sk);
1378         struct sw_flow_key key;
1379         struct sk_buff *reply;
1380         struct sw_flow *flow = NULL;
1381         struct datapath *dp;
1382         struct sw_flow_match match;
1383         struct sw_flow_id ufid;
1384         u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1385         int err;
1386         bool log = !a[OVS_FLOW_ATTR_PROBE];
1387         bool ufid_present;
1388
1389         ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1390         if (a[OVS_FLOW_ATTR_KEY]) {
1391                 ovs_match_init(&match, &key, true, NULL);
1392                 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1393                                         NULL, log);
1394                 if (unlikely(err))
1395                         return err;
1396         }
1397
1398         ovs_lock();
1399         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1400         if (unlikely(!dp)) {
1401                 err = -ENODEV;
1402                 goto unlock;
1403         }
1404
1405         if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1406                 err = ovs_flow_tbl_flush(&dp->table);
1407                 goto unlock;
1408         }
1409
1410         if (ufid_present)
1411                 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1412         else
1413                 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1414         if (unlikely(!flow)) {
1415                 err = -ENOENT;
1416                 goto unlock;
1417         }
1418
1419         ovs_flow_tbl_remove(&dp->table, flow);
1420         ovs_unlock();
1421
1422         reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1423                                         &flow->id, info, false, ufid_flags);
1424         if (likely(reply)) {
1425                 if (!IS_ERR(reply)) {
1426                         rcu_read_lock();        /*To keep RCU checker happy. */
1427                         err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1428                                                      reply, info->snd_portid,
1429                                                      info->snd_seq, 0,
1430                                                      OVS_FLOW_CMD_DEL,
1431                                                      ufid_flags);
1432                         rcu_read_unlock();
1433                         if (WARN_ON_ONCE(err < 0)) {
1434                                 kfree_skb(reply);
1435                                 goto out_free;
1436                         }
1437
1438                         ovs_notify(&dp_flow_genl_family, reply, info);
1439                 } else {
1440                         netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0,
1441                                         PTR_ERR(reply));
1442                 }
1443         }
1444
1445 out_free:
1446         ovs_flow_free(flow, true);
1447         return 0;
1448 unlock:
1449         ovs_unlock();
1450         return err;
1451 }
1452
1453 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1454 {
1455         struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1456         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1457         struct table_instance *ti;
1458         struct datapath *dp;
1459         u32 ufid_flags;
1460         int err;
1461
1462         err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a,
1463                                        OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1464         if (err)
1465                 return err;
1466         ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1467
1468         rcu_read_lock();
1469         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1470         if (!dp) {
1471                 rcu_read_unlock();
1472                 return -ENODEV;
1473         }
1474
1475         ti = rcu_dereference(dp->table.ti);
1476         for (;;) {
1477                 struct sw_flow *flow;
1478                 u32 bucket, obj;
1479
1480                 bucket = cb->args[0];
1481                 obj = cb->args[1];
1482                 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1483                 if (!flow)
1484                         break;
1485
1486                 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1487                                            NETLINK_CB(cb->skb).portid,
1488                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1489                                            OVS_FLOW_CMD_GET, ufid_flags) < 0)
1490                         break;
1491
1492                 cb->args[0] = bucket;
1493                 cb->args[1] = obj;
1494         }
1495         rcu_read_unlock();
1496         return skb->len;
1497 }
1498
1499 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1500         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1501         [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1502         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1503         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1504         [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1505         [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1506         [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1507 };
1508
1509 static const struct genl_small_ops dp_flow_genl_ops[] = {
1510         { .cmd = OVS_FLOW_CMD_NEW,
1511           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1512           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1513           .doit = ovs_flow_cmd_new
1514         },
1515         { .cmd = OVS_FLOW_CMD_DEL,
1516           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1517           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1518           .doit = ovs_flow_cmd_del
1519         },
1520         { .cmd = OVS_FLOW_CMD_GET,
1521           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1522           .flags = 0,               /* OK for unprivileged users. */
1523           .doit = ovs_flow_cmd_get,
1524           .dumpit = ovs_flow_cmd_dump
1525         },
1526         { .cmd = OVS_FLOW_CMD_SET,
1527           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1528           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1529           .doit = ovs_flow_cmd_set,
1530         },
1531 };
1532
1533 static struct genl_family dp_flow_genl_family __ro_after_init = {
1534         .hdrsize = sizeof(struct ovs_header),
1535         .name = OVS_FLOW_FAMILY,
1536         .version = OVS_FLOW_VERSION,
1537         .maxattr = OVS_FLOW_ATTR_MAX,
1538         .policy = flow_policy,
1539         .netnsok = true,
1540         .parallel_ops = true,
1541         .small_ops = dp_flow_genl_ops,
1542         .n_small_ops = ARRAY_SIZE(dp_flow_genl_ops),
1543         .resv_start_op = OVS_FLOW_CMD_SET + 1,
1544         .mcgrps = &ovs_dp_flow_multicast_group,
1545         .n_mcgrps = 1,
1546         .module = THIS_MODULE,
1547 };
1548
1549 static size_t ovs_dp_cmd_msg_size(void)
1550 {
1551         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1552
1553         msgsize += nla_total_size(IFNAMSIZ);
1554         msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1555         msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1556         msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1557         msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */
1558         msgsize += nla_total_size(sizeof(u32) * nr_cpu_ids); /* OVS_DP_ATTR_PER_CPU_PIDS */
1559
1560         return msgsize;
1561 }
1562
1563 /* Called with ovs_mutex. */
1564 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1565                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1566 {
1567         struct ovs_header *ovs_header;
1568         struct ovs_dp_stats dp_stats;
1569         struct ovs_dp_megaflow_stats dp_megaflow_stats;
1570         struct dp_nlsk_pids *pids = ovsl_dereference(dp->upcall_portids);
1571         int err, pids_len;
1572
1573         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1574                                  flags, cmd);
1575         if (!ovs_header)
1576                 goto error;
1577
1578         ovs_header->dp_ifindex = get_dpifindex(dp);
1579
1580         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1581         if (err)
1582                 goto nla_put_failure;
1583
1584         get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1585         if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1586                           &dp_stats, OVS_DP_ATTR_PAD))
1587                 goto nla_put_failure;
1588
1589         if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1590                           sizeof(struct ovs_dp_megaflow_stats),
1591                           &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1592                 goto nla_put_failure;
1593
1594         if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1595                 goto nla_put_failure;
1596
1597         if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE,
1598                         ovs_flow_tbl_masks_cache_size(&dp->table)))
1599                 goto nla_put_failure;
1600
1601         if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU && pids) {
1602                 pids_len = min(pids->n_pids, nr_cpu_ids) * sizeof(u32);
1603                 if (nla_put(skb, OVS_DP_ATTR_PER_CPU_PIDS, pids_len, &pids->pids))
1604                         goto nla_put_failure;
1605         }
1606
1607         genlmsg_end(skb, ovs_header);
1608         return 0;
1609
1610 nla_put_failure:
1611         genlmsg_cancel(skb, ovs_header);
1612 error:
1613         return -EMSGSIZE;
1614 }
1615
1616 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1617 {
1618         return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1619 }
1620
1621 /* Called with rcu_read_lock or ovs_mutex. */
1622 static struct datapath *lookup_datapath(struct net *net,
1623                                         const struct ovs_header *ovs_header,
1624                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1625 {
1626         struct datapath *dp;
1627
1628         if (!a[OVS_DP_ATTR_NAME])
1629                 dp = get_dp(net, ovs_header->dp_ifindex);
1630         else {
1631                 struct vport *vport;
1632
1633                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1634                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1635         }
1636         return dp ? dp : ERR_PTR(-ENODEV);
1637 }
1638
1639 static void ovs_dp_reset_user_features(struct sk_buff *skb,
1640                                        struct genl_info *info)
1641 {
1642         struct datapath *dp;
1643
1644         dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
1645                              info->attrs);
1646         if (IS_ERR(dp))
1647                 return;
1648
1649         pr_warn("%s: Dropping previously announced user features\n",
1650                 ovs_dp_name(dp));
1651         dp->user_features = 0;
1652 }
1653
1654 static int ovs_dp_set_upcall_portids(struct datapath *dp,
1655                               const struct nlattr *ids)
1656 {
1657         struct dp_nlsk_pids *old, *dp_nlsk_pids;
1658
1659         if (!nla_len(ids) || nla_len(ids) % sizeof(u32))
1660                 return -EINVAL;
1661
1662         old = ovsl_dereference(dp->upcall_portids);
1663
1664         dp_nlsk_pids = kmalloc(sizeof(*dp_nlsk_pids) + nla_len(ids),
1665                                GFP_KERNEL);
1666         if (!dp_nlsk_pids)
1667                 return -ENOMEM;
1668
1669         dp_nlsk_pids->n_pids = nla_len(ids) / sizeof(u32);
1670         nla_memcpy(dp_nlsk_pids->pids, ids, nla_len(ids));
1671
1672         rcu_assign_pointer(dp->upcall_portids, dp_nlsk_pids);
1673
1674         kfree_rcu(old, rcu);
1675
1676         return 0;
1677 }
1678
1679 u32 ovs_dp_get_upcall_portid(const struct datapath *dp, uint32_t cpu_id)
1680 {
1681         struct dp_nlsk_pids *dp_nlsk_pids;
1682
1683         dp_nlsk_pids = rcu_dereference(dp->upcall_portids);
1684
1685         if (dp_nlsk_pids) {
1686                 if (cpu_id < dp_nlsk_pids->n_pids) {
1687                         return dp_nlsk_pids->pids[cpu_id];
1688                 } else if (dp_nlsk_pids->n_pids > 0 &&
1689                            cpu_id >= dp_nlsk_pids->n_pids) {
1690                         /* If the number of netlink PIDs is mismatched with
1691                          * the number of CPUs as seen by the kernel, log this
1692                          * and send the upcall to an arbitrary socket (0) in
1693                          * order to not drop packets
1694                          */
1695                         pr_info_ratelimited("cpu_id mismatch with handler threads");
1696                         return dp_nlsk_pids->pids[cpu_id %
1697                                                   dp_nlsk_pids->n_pids];
1698                 } else {
1699                         return 0;
1700                 }
1701         } else {
1702                 return 0;
1703         }
1704 }
1705
1706 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1707 {
1708         u32 user_features = 0, old_features = dp->user_features;
1709         int err;
1710
1711         if (a[OVS_DP_ATTR_USER_FEATURES]) {
1712                 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1713
1714                 if (user_features & ~(OVS_DP_F_VPORT_PIDS |
1715                                       OVS_DP_F_UNALIGNED |
1716                                       OVS_DP_F_TC_RECIRC_SHARING |
1717                                       OVS_DP_F_DISPATCH_UPCALL_PER_CPU))
1718                         return -EOPNOTSUPP;
1719
1720 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1721                 if (user_features & OVS_DP_F_TC_RECIRC_SHARING)
1722                         return -EOPNOTSUPP;
1723 #endif
1724         }
1725
1726         if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) {
1727                 int err;
1728                 u32 cache_size;
1729
1730                 cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]);
1731                 err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size);
1732                 if (err)
1733                         return err;
1734         }
1735
1736         dp->user_features = user_features;
1737
1738         if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU &&
1739             a[OVS_DP_ATTR_PER_CPU_PIDS]) {
1740                 /* Upcall Netlink Port IDs have been updated */
1741                 err = ovs_dp_set_upcall_portids(dp,
1742                                                 a[OVS_DP_ATTR_PER_CPU_PIDS]);
1743                 if (err)
1744                         return err;
1745         }
1746
1747         if ((dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) &&
1748             !(old_features & OVS_DP_F_TC_RECIRC_SHARING))
1749                 tc_skb_ext_tc_enable();
1750         else if (!(dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) &&
1751                  (old_features & OVS_DP_F_TC_RECIRC_SHARING))
1752                 tc_skb_ext_tc_disable();
1753
1754         return 0;
1755 }
1756
1757 static int ovs_dp_stats_init(struct datapath *dp)
1758 {
1759         dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1760         if (!dp->stats_percpu)
1761                 return -ENOMEM;
1762
1763         return 0;
1764 }
1765
1766 static int ovs_dp_vport_init(struct datapath *dp)
1767 {
1768         int i;
1769
1770         dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
1771                                   sizeof(struct hlist_head),
1772                                   GFP_KERNEL);
1773         if (!dp->ports)
1774                 return -ENOMEM;
1775
1776         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1777                 INIT_HLIST_HEAD(&dp->ports[i]);
1778
1779         return 0;
1780 }
1781
1782 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1783 {
1784         struct nlattr **a = info->attrs;
1785         struct vport_parms parms;
1786         struct sk_buff *reply;
1787         struct datapath *dp;
1788         struct vport *vport;
1789         struct ovs_net *ovs_net;
1790         int err;
1791
1792         err = -EINVAL;
1793         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1794                 goto err;
1795
1796         reply = ovs_dp_cmd_alloc_info();
1797         if (!reply)
1798                 return -ENOMEM;
1799
1800         err = -ENOMEM;
1801         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1802         if (dp == NULL)
1803                 goto err_destroy_reply;
1804
1805         ovs_dp_set_net(dp, sock_net(skb->sk));
1806
1807         /* Allocate table. */
1808         err = ovs_flow_tbl_init(&dp->table);
1809         if (err)
1810                 goto err_destroy_dp;
1811
1812         err = ovs_dp_stats_init(dp);
1813         if (err)
1814                 goto err_destroy_table;
1815
1816         err = ovs_dp_vport_init(dp);
1817         if (err)
1818                 goto err_destroy_stats;
1819
1820         err = ovs_meters_init(dp);
1821         if (err)
1822                 goto err_destroy_ports;
1823
1824         /* Set up our datapath device. */
1825         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1826         parms.type = OVS_VPORT_TYPE_INTERNAL;
1827         parms.options = NULL;
1828         parms.dp = dp;
1829         parms.port_no = OVSP_LOCAL;
1830         parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1831         parms.desired_ifindex = a[OVS_DP_ATTR_IFINDEX]
1832                 ? nla_get_s32(a[OVS_DP_ATTR_IFINDEX]) : 0;
1833
1834         /* So far only local changes have been made, now need the lock. */
1835         ovs_lock();
1836
1837         err = ovs_dp_change(dp, a);
1838         if (err)
1839                 goto err_unlock_and_destroy_meters;
1840
1841         vport = new_vport(&parms);
1842         if (IS_ERR(vport)) {
1843                 err = PTR_ERR(vport);
1844                 if (err == -EBUSY)
1845                         err = -EEXIST;
1846
1847                 if (err == -EEXIST) {
1848                         /* An outdated user space instance that does not understand
1849                          * the concept of user_features has attempted to create a new
1850                          * datapath and is likely to reuse it. Drop all user features.
1851                          */
1852                         if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1853                                 ovs_dp_reset_user_features(skb, info);
1854                 }
1855
1856                 goto err_destroy_portids;
1857         }
1858
1859         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1860                                    info->snd_seq, 0, OVS_DP_CMD_NEW);
1861         BUG_ON(err < 0);
1862
1863         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1864         list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1865
1866         ovs_unlock();
1867
1868         ovs_notify(&dp_datapath_genl_family, reply, info);
1869         return 0;
1870
1871 err_destroy_portids:
1872         kfree(rcu_dereference_raw(dp->upcall_portids));
1873 err_unlock_and_destroy_meters:
1874         ovs_unlock();
1875         ovs_meters_exit(dp);
1876 err_destroy_ports:
1877         kfree(dp->ports);
1878 err_destroy_stats:
1879         free_percpu(dp->stats_percpu);
1880 err_destroy_table:
1881         ovs_flow_tbl_destroy(&dp->table);
1882 err_destroy_dp:
1883         kfree(dp);
1884 err_destroy_reply:
1885         kfree_skb(reply);
1886 err:
1887         return err;
1888 }
1889
1890 /* Called with ovs_mutex. */
1891 static void __dp_destroy(struct datapath *dp)
1892 {
1893         struct flow_table *table = &dp->table;
1894         int i;
1895
1896         if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING)
1897                 tc_skb_ext_tc_disable();
1898
1899         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1900                 struct vport *vport;
1901                 struct hlist_node *n;
1902
1903                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1904                         if (vport->port_no != OVSP_LOCAL)
1905                                 ovs_dp_detach_port(vport);
1906         }
1907
1908         list_del_rcu(&dp->list_node);
1909
1910         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1911          * all ports in datapath are destroyed first before freeing datapath.
1912          */
1913         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1914
1915         /* Flush sw_flow in the tables. RCU cb only releases resource
1916          * such as dp, ports and tables. That may avoid some issues
1917          * such as RCU usage warning.
1918          */
1919         table_instance_flow_flush(table, ovsl_dereference(table->ti),
1920                                   ovsl_dereference(table->ufid_ti));
1921
1922         /* RCU destroy the ports, meters and flow tables. */
1923         call_rcu(&dp->rcu, destroy_dp_rcu);
1924 }
1925
1926 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1927 {
1928         struct sk_buff *reply;
1929         struct datapath *dp;
1930         int err;
1931
1932         reply = ovs_dp_cmd_alloc_info();
1933         if (!reply)
1934                 return -ENOMEM;
1935
1936         ovs_lock();
1937         dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
1938                              info->attrs);
1939         err = PTR_ERR(dp);
1940         if (IS_ERR(dp))
1941                 goto err_unlock_free;
1942
1943         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1944                                    info->snd_seq, 0, OVS_DP_CMD_DEL);
1945         BUG_ON(err < 0);
1946
1947         __dp_destroy(dp);
1948         ovs_unlock();
1949
1950         ovs_notify(&dp_datapath_genl_family, reply, info);
1951
1952         return 0;
1953
1954 err_unlock_free:
1955         ovs_unlock();
1956         kfree_skb(reply);
1957         return err;
1958 }
1959
1960 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1961 {
1962         struct sk_buff *reply;
1963         struct datapath *dp;
1964         int err;
1965
1966         reply = ovs_dp_cmd_alloc_info();
1967         if (!reply)
1968                 return -ENOMEM;
1969
1970         ovs_lock();
1971         dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
1972                              info->attrs);
1973         err = PTR_ERR(dp);
1974         if (IS_ERR(dp))
1975                 goto err_unlock_free;
1976
1977         err = ovs_dp_change(dp, info->attrs);
1978         if (err)
1979                 goto err_unlock_free;
1980
1981         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1982                                    info->snd_seq, 0, OVS_DP_CMD_SET);
1983         BUG_ON(err < 0);
1984
1985         ovs_unlock();
1986         ovs_notify(&dp_datapath_genl_family, reply, info);
1987
1988         return 0;
1989
1990 err_unlock_free:
1991         ovs_unlock();
1992         kfree_skb(reply);
1993         return err;
1994 }
1995
1996 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1997 {
1998         struct sk_buff *reply;
1999         struct datapath *dp;
2000         int err;
2001
2002         reply = ovs_dp_cmd_alloc_info();
2003         if (!reply)
2004                 return -ENOMEM;
2005
2006         ovs_lock();
2007         dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
2008                              info->attrs);
2009         if (IS_ERR(dp)) {
2010                 err = PTR_ERR(dp);
2011                 goto err_unlock_free;
2012         }
2013         err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
2014                                    info->snd_seq, 0, OVS_DP_CMD_GET);
2015         BUG_ON(err < 0);
2016         ovs_unlock();
2017
2018         return genlmsg_reply(reply, info);
2019
2020 err_unlock_free:
2021         ovs_unlock();
2022         kfree_skb(reply);
2023         return err;
2024 }
2025
2026 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2027 {
2028         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
2029         struct datapath *dp;
2030         int skip = cb->args[0];
2031         int i = 0;
2032
2033         ovs_lock();
2034         list_for_each_entry(dp, &ovs_net->dps, list_node) {
2035                 if (i >= skip &&
2036                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
2037                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
2038                                          OVS_DP_CMD_GET) < 0)
2039                         break;
2040                 i++;
2041         }
2042         ovs_unlock();
2043
2044         cb->args[0] = i;
2045
2046         return skb->len;
2047 }
2048
2049 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
2050         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2051         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2052         [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
2053         [OVS_DP_ATTR_MASKS_CACHE_SIZE] =  NLA_POLICY_RANGE(NLA_U32, 0,
2054                 PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)),
2055         [OVS_DP_ATTR_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 0),
2056 };
2057
2058 static const struct genl_small_ops dp_datapath_genl_ops[] = {
2059         { .cmd = OVS_DP_CMD_NEW,
2060           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2061           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2062           .doit = ovs_dp_cmd_new
2063         },
2064         { .cmd = OVS_DP_CMD_DEL,
2065           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2066           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2067           .doit = ovs_dp_cmd_del
2068         },
2069         { .cmd = OVS_DP_CMD_GET,
2070           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2071           .flags = 0,               /* OK for unprivileged users. */
2072           .doit = ovs_dp_cmd_get,
2073           .dumpit = ovs_dp_cmd_dump
2074         },
2075         { .cmd = OVS_DP_CMD_SET,
2076           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2077           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2078           .doit = ovs_dp_cmd_set,
2079         },
2080 };
2081
2082 static struct genl_family dp_datapath_genl_family __ro_after_init = {
2083         .hdrsize = sizeof(struct ovs_header),
2084         .name = OVS_DATAPATH_FAMILY,
2085         .version = OVS_DATAPATH_VERSION,
2086         .maxattr = OVS_DP_ATTR_MAX,
2087         .policy = datapath_policy,
2088         .netnsok = true,
2089         .parallel_ops = true,
2090         .small_ops = dp_datapath_genl_ops,
2091         .n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops),
2092         .resv_start_op = OVS_DP_CMD_SET + 1,
2093         .mcgrps = &ovs_dp_datapath_multicast_group,
2094         .n_mcgrps = 1,
2095         .module = THIS_MODULE,
2096 };
2097
2098 /* Called with ovs_mutex or RCU read lock. */
2099 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
2100                                    struct net *net, u32 portid, u32 seq,
2101                                    u32 flags, u8 cmd, gfp_t gfp)
2102 {
2103         struct ovs_header *ovs_header;
2104         struct ovs_vport_stats vport_stats;
2105         int err;
2106
2107         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
2108                                  flags, cmd);
2109         if (!ovs_header)
2110                 return -EMSGSIZE;
2111
2112         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
2113
2114         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
2115             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
2116             nla_put_string(skb, OVS_VPORT_ATTR_NAME,
2117                            ovs_vport_name(vport)) ||
2118             nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
2119                 goto nla_put_failure;
2120
2121         if (!net_eq(net, dev_net(vport->dev))) {
2122                 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp);
2123
2124                 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
2125                         goto nla_put_failure;
2126         }
2127
2128         ovs_vport_get_stats(vport, &vport_stats);
2129         if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
2130                           sizeof(struct ovs_vport_stats), &vport_stats,
2131                           OVS_VPORT_ATTR_PAD))
2132                 goto nla_put_failure;
2133
2134         if (ovs_vport_get_upcall_stats(vport, skb))
2135                 goto nla_put_failure;
2136
2137         if (ovs_vport_get_upcall_portids(vport, skb))
2138                 goto nla_put_failure;
2139
2140         err = ovs_vport_get_options(vport, skb);
2141         if (err == -EMSGSIZE)
2142                 goto error;
2143
2144         genlmsg_end(skb, ovs_header);
2145         return 0;
2146
2147 nla_put_failure:
2148         err = -EMSGSIZE;
2149 error:
2150         genlmsg_cancel(skb, ovs_header);
2151         return err;
2152 }
2153
2154 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
2155 {
2156         return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2157 }
2158
2159 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
2160 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
2161                                          u32 portid, u32 seq, u8 cmd)
2162 {
2163         struct sk_buff *skb;
2164         int retval;
2165
2166         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2167         if (!skb)
2168                 return ERR_PTR(-ENOMEM);
2169
2170         retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd,
2171                                          GFP_KERNEL);
2172         BUG_ON(retval < 0);
2173
2174         return skb;
2175 }
2176
2177 /* Called with ovs_mutex or RCU read lock. */
2178 static struct vport *lookup_vport(struct net *net,
2179                                   const struct ovs_header *ovs_header,
2180                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2181 {
2182         struct datapath *dp;
2183         struct vport *vport;
2184
2185         if (a[OVS_VPORT_ATTR_IFINDEX])
2186                 return ERR_PTR(-EOPNOTSUPP);
2187         if (a[OVS_VPORT_ATTR_NAME]) {
2188                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
2189                 if (!vport)
2190                         return ERR_PTR(-ENODEV);
2191                 if (ovs_header->dp_ifindex &&
2192                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
2193                         return ERR_PTR(-ENODEV);
2194                 return vport;
2195         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
2196                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2197
2198                 if (port_no >= DP_MAX_PORTS)
2199                         return ERR_PTR(-EFBIG);
2200
2201                 dp = get_dp(net, ovs_header->dp_ifindex);
2202                 if (!dp)
2203                         return ERR_PTR(-ENODEV);
2204
2205                 vport = ovs_vport_ovsl_rcu(dp, port_no);
2206                 if (!vport)
2207                         return ERR_PTR(-ENODEV);
2208                 return vport;
2209         } else
2210                 return ERR_PTR(-EINVAL);
2211
2212 }
2213
2214 static unsigned int ovs_get_max_headroom(struct datapath *dp)
2215 {
2216         unsigned int dev_headroom, max_headroom = 0;
2217         struct net_device *dev;
2218         struct vport *vport;
2219         int i;
2220
2221         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2222                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2223                                          lockdep_ovsl_is_held()) {
2224                         dev = vport->dev;
2225                         dev_headroom = netdev_get_fwd_headroom(dev);
2226                         if (dev_headroom > max_headroom)
2227                                 max_headroom = dev_headroom;
2228                 }
2229         }
2230
2231         return max_headroom;
2232 }
2233
2234 /* Called with ovs_mutex */
2235 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
2236 {
2237         struct vport *vport;
2238         int i;
2239
2240         dp->max_headroom = new_headroom;
2241         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2242                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2243                                          lockdep_ovsl_is_held())
2244                         netdev_set_rx_headroom(vport->dev, new_headroom);
2245         }
2246 }
2247
2248 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2249 {
2250         struct nlattr **a = info->attrs;
2251         struct ovs_header *ovs_header = genl_info_userhdr(info);
2252         struct vport_parms parms;
2253         struct sk_buff *reply;
2254         struct vport *vport;
2255         struct datapath *dp;
2256         unsigned int new_headroom;
2257         u32 port_no;
2258         int err;
2259
2260         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2261             !a[OVS_VPORT_ATTR_UPCALL_PID])
2262                 return -EINVAL;
2263
2264         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2265
2266         if (a[OVS_VPORT_ATTR_IFINDEX] && parms.type != OVS_VPORT_TYPE_INTERNAL)
2267                 return -EOPNOTSUPP;
2268
2269         port_no = a[OVS_VPORT_ATTR_PORT_NO]
2270                 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2271         if (port_no >= DP_MAX_PORTS)
2272                 return -EFBIG;
2273
2274         reply = ovs_vport_cmd_alloc_info();
2275         if (!reply)
2276                 return -ENOMEM;
2277
2278         ovs_lock();
2279 restart:
2280         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2281         err = -ENODEV;
2282         if (!dp)
2283                 goto exit_unlock_free;
2284
2285         if (port_no) {
2286                 vport = ovs_vport_ovsl(dp, port_no);
2287                 err = -EBUSY;
2288                 if (vport)
2289                         goto exit_unlock_free;
2290         } else {
2291                 for (port_no = 1; ; port_no++) {
2292                         if (port_no >= DP_MAX_PORTS) {
2293                                 err = -EFBIG;
2294                                 goto exit_unlock_free;
2295                         }
2296                         vport = ovs_vport_ovsl(dp, port_no);
2297                         if (!vport)
2298                                 break;
2299                 }
2300         }
2301
2302         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2303         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2304         parms.dp = dp;
2305         parms.port_no = port_no;
2306         parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2307         parms.desired_ifindex = a[OVS_VPORT_ATTR_IFINDEX]
2308                 ? nla_get_s32(a[OVS_VPORT_ATTR_IFINDEX]) : 0;
2309
2310         vport = new_vport(&parms);
2311         err = PTR_ERR(vport);
2312         if (IS_ERR(vport)) {
2313                 if (err == -EAGAIN)
2314                         goto restart;
2315                 goto exit_unlock_free;
2316         }
2317
2318         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2319                                       info->snd_portid, info->snd_seq, 0,
2320                                       OVS_VPORT_CMD_NEW, GFP_KERNEL);
2321
2322         new_headroom = netdev_get_fwd_headroom(vport->dev);
2323
2324         if (new_headroom > dp->max_headroom)
2325                 ovs_update_headroom(dp, new_headroom);
2326         else
2327                 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2328
2329         BUG_ON(err < 0);
2330         ovs_unlock();
2331
2332         ovs_notify(&dp_vport_genl_family, reply, info);
2333         return 0;
2334
2335 exit_unlock_free:
2336         ovs_unlock();
2337         kfree_skb(reply);
2338         return err;
2339 }
2340
2341 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2342 {
2343         struct nlattr **a = info->attrs;
2344         struct sk_buff *reply;
2345         struct vport *vport;
2346         int err;
2347
2348         reply = ovs_vport_cmd_alloc_info();
2349         if (!reply)
2350                 return -ENOMEM;
2351
2352         ovs_lock();
2353         vport = lookup_vport(sock_net(skb->sk), genl_info_userhdr(info), a);
2354         err = PTR_ERR(vport);
2355         if (IS_ERR(vport))
2356                 goto exit_unlock_free;
2357
2358         if (a[OVS_VPORT_ATTR_TYPE] &&
2359             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2360                 err = -EINVAL;
2361                 goto exit_unlock_free;
2362         }
2363
2364         if (a[OVS_VPORT_ATTR_OPTIONS]) {
2365                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2366                 if (err)
2367                         goto exit_unlock_free;
2368         }
2369
2370
2371         if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2372                 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2373
2374                 err = ovs_vport_set_upcall_portids(vport, ids);
2375                 if (err)
2376                         goto exit_unlock_free;
2377         }
2378
2379         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2380                                       info->snd_portid, info->snd_seq, 0,
2381                                       OVS_VPORT_CMD_SET, GFP_KERNEL);
2382         BUG_ON(err < 0);
2383
2384         ovs_unlock();
2385         ovs_notify(&dp_vport_genl_family, reply, info);
2386         return 0;
2387
2388 exit_unlock_free:
2389         ovs_unlock();
2390         kfree_skb(reply);
2391         return err;
2392 }
2393
2394 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2395 {
2396         bool update_headroom = false;
2397         struct nlattr **a = info->attrs;
2398         struct sk_buff *reply;
2399         struct datapath *dp;
2400         struct vport *vport;
2401         unsigned int new_headroom;
2402         int err;
2403
2404         reply = ovs_vport_cmd_alloc_info();
2405         if (!reply)
2406                 return -ENOMEM;
2407
2408         ovs_lock();
2409         vport = lookup_vport(sock_net(skb->sk), genl_info_userhdr(info), a);
2410         err = PTR_ERR(vport);
2411         if (IS_ERR(vport))
2412                 goto exit_unlock_free;
2413
2414         if (vport->port_no == OVSP_LOCAL) {
2415                 err = -EINVAL;
2416                 goto exit_unlock_free;
2417         }
2418
2419         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2420                                       info->snd_portid, info->snd_seq, 0,
2421                                       OVS_VPORT_CMD_DEL, GFP_KERNEL);
2422         BUG_ON(err < 0);
2423
2424         /* the vport deletion may trigger dp headroom update */
2425         dp = vport->dp;
2426         if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2427                 update_headroom = true;
2428
2429         netdev_reset_rx_headroom(vport->dev);
2430         ovs_dp_detach_port(vport);
2431
2432         if (update_headroom) {
2433                 new_headroom = ovs_get_max_headroom(dp);
2434
2435                 if (new_headroom < dp->max_headroom)
2436                         ovs_update_headroom(dp, new_headroom);
2437         }
2438         ovs_unlock();
2439
2440         ovs_notify(&dp_vport_genl_family, reply, info);
2441         return 0;
2442
2443 exit_unlock_free:
2444         ovs_unlock();
2445         kfree_skb(reply);
2446         return err;
2447 }
2448
2449 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2450 {
2451         struct nlattr **a = info->attrs;
2452         struct ovs_header *ovs_header = genl_info_userhdr(info);
2453         struct sk_buff *reply;
2454         struct vport *vport;
2455         int err;
2456
2457         reply = ovs_vport_cmd_alloc_info();
2458         if (!reply)
2459                 return -ENOMEM;
2460
2461         rcu_read_lock();
2462         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2463         err = PTR_ERR(vport);
2464         if (IS_ERR(vport))
2465                 goto exit_unlock_free;
2466         err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2467                                       info->snd_portid, info->snd_seq, 0,
2468                                       OVS_VPORT_CMD_GET, GFP_ATOMIC);
2469         BUG_ON(err < 0);
2470         rcu_read_unlock();
2471
2472         return genlmsg_reply(reply, info);
2473
2474 exit_unlock_free:
2475         rcu_read_unlock();
2476         kfree_skb(reply);
2477         return err;
2478 }
2479
2480 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2481 {
2482         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2483         struct datapath *dp;
2484         int bucket = cb->args[0], skip = cb->args[1];
2485         int i, j = 0;
2486
2487         rcu_read_lock();
2488         dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2489         if (!dp) {
2490                 rcu_read_unlock();
2491                 return -ENODEV;
2492         }
2493         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2494                 struct vport *vport;
2495
2496                 j = 0;
2497                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2498                         if (j >= skip &&
2499                             ovs_vport_cmd_fill_info(vport, skb,
2500                                                     sock_net(skb->sk),
2501                                                     NETLINK_CB(cb->skb).portid,
2502                                                     cb->nlh->nlmsg_seq,
2503                                                     NLM_F_MULTI,
2504                                                     OVS_VPORT_CMD_GET,
2505                                                     GFP_ATOMIC) < 0)
2506                                 goto out;
2507
2508                         j++;
2509                 }
2510                 skip = 0;
2511         }
2512 out:
2513         rcu_read_unlock();
2514
2515         cb->args[0] = i;
2516         cb->args[1] = j;
2517
2518         return skb->len;
2519 }
2520
2521 static void ovs_dp_masks_rebalance(struct work_struct *work)
2522 {
2523         struct ovs_net *ovs_net = container_of(work, struct ovs_net,
2524                                                masks_rebalance.work);
2525         struct datapath *dp;
2526
2527         ovs_lock();
2528
2529         list_for_each_entry(dp, &ovs_net->dps, list_node)
2530                 ovs_flow_masks_rebalance(&dp->table);
2531
2532         ovs_unlock();
2533
2534         schedule_delayed_work(&ovs_net->masks_rebalance,
2535                               msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2536 }
2537
2538 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2539         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2540         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2541         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2542         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2543         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2544         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2545         [OVS_VPORT_ATTR_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 0),
2546         [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2547         [OVS_VPORT_ATTR_UPCALL_STATS] = { .type = NLA_NESTED },
2548 };
2549
2550 static const struct genl_small_ops dp_vport_genl_ops[] = {
2551         { .cmd = OVS_VPORT_CMD_NEW,
2552           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2553           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2554           .doit = ovs_vport_cmd_new
2555         },
2556         { .cmd = OVS_VPORT_CMD_DEL,
2557           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2558           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2559           .doit = ovs_vport_cmd_del
2560         },
2561         { .cmd = OVS_VPORT_CMD_GET,
2562           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2563           .flags = 0,               /* OK for unprivileged users. */
2564           .doit = ovs_vport_cmd_get,
2565           .dumpit = ovs_vport_cmd_dump
2566         },
2567         { .cmd = OVS_VPORT_CMD_SET,
2568           .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2569           .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2570           .doit = ovs_vport_cmd_set,
2571         },
2572 };
2573
2574 struct genl_family dp_vport_genl_family __ro_after_init = {
2575         .hdrsize = sizeof(struct ovs_header),
2576         .name = OVS_VPORT_FAMILY,
2577         .version = OVS_VPORT_VERSION,
2578         .maxattr = OVS_VPORT_ATTR_MAX,
2579         .policy = vport_policy,
2580         .netnsok = true,
2581         .parallel_ops = true,
2582         .small_ops = dp_vport_genl_ops,
2583         .n_small_ops = ARRAY_SIZE(dp_vport_genl_ops),
2584         .resv_start_op = OVS_VPORT_CMD_SET + 1,
2585         .mcgrps = &ovs_dp_vport_multicast_group,
2586         .n_mcgrps = 1,
2587         .module = THIS_MODULE,
2588 };
2589
2590 static struct genl_family * const dp_genl_families[] = {
2591         &dp_datapath_genl_family,
2592         &dp_vport_genl_family,
2593         &dp_flow_genl_family,
2594         &dp_packet_genl_family,
2595         &dp_meter_genl_family,
2596 #if     IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2597         &dp_ct_limit_genl_family,
2598 #endif
2599 };
2600
2601 static void dp_unregister_genl(int n_families)
2602 {
2603         int i;
2604
2605         for (i = 0; i < n_families; i++)
2606                 genl_unregister_family(dp_genl_families[i]);
2607 }
2608
2609 static int __init dp_register_genl(void)
2610 {
2611         int err;
2612         int i;
2613
2614         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2615
2616                 err = genl_register_family(dp_genl_families[i]);
2617                 if (err)
2618                         goto error;
2619         }
2620
2621         return 0;
2622
2623 error:
2624         dp_unregister_genl(i);
2625         return err;
2626 }
2627
2628 static int __net_init ovs_init_net(struct net *net)
2629 {
2630         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2631         int err;
2632
2633         INIT_LIST_HEAD(&ovs_net->dps);
2634         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2635         INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance);
2636
2637         err = ovs_ct_init(net);
2638         if (err)
2639                 return err;
2640
2641         schedule_delayed_work(&ovs_net->masks_rebalance,
2642                               msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2643         return 0;
2644 }
2645
2646 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2647                                             struct list_head *head)
2648 {
2649         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2650         struct datapath *dp;
2651
2652         list_for_each_entry(dp, &ovs_net->dps, list_node) {
2653                 int i;
2654
2655                 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2656                         struct vport *vport;
2657
2658                         hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2659                                 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2660                                         continue;
2661
2662                                 if (dev_net(vport->dev) == dnet)
2663                                         list_add(&vport->detach_list, head);
2664                         }
2665                 }
2666         }
2667 }
2668
2669 static void __net_exit ovs_exit_net(struct net *dnet)
2670 {
2671         struct datapath *dp, *dp_next;
2672         struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2673         struct vport *vport, *vport_next;
2674         struct net *net;
2675         LIST_HEAD(head);
2676
2677         ovs_lock();
2678
2679         ovs_ct_exit(dnet);
2680
2681         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2682                 __dp_destroy(dp);
2683
2684         down_read(&net_rwsem);
2685         for_each_net(net)
2686                 list_vports_from_net(net, dnet, &head);
2687         up_read(&net_rwsem);
2688
2689         /* Detach all vports from given namespace. */
2690         list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2691                 list_del(&vport->detach_list);
2692                 ovs_dp_detach_port(vport);
2693         }
2694
2695         ovs_unlock();
2696
2697         cancel_delayed_work_sync(&ovs_net->masks_rebalance);
2698         cancel_work_sync(&ovs_net->dp_notify_work);
2699 }
2700
2701 static struct pernet_operations ovs_net_ops = {
2702         .init = ovs_init_net,
2703         .exit = ovs_exit_net,
2704         .id   = &ovs_net_id,
2705         .size = sizeof(struct ovs_net),
2706 };
2707
2708 static const char * const ovs_drop_reasons[] = {
2709 #define S(x)    (#x),
2710         OVS_DROP_REASONS(S)
2711 #undef S
2712 };
2713
2714 static struct drop_reason_list drop_reason_list_ovs = {
2715         .reasons = ovs_drop_reasons,
2716         .n_reasons = ARRAY_SIZE(ovs_drop_reasons),
2717 };
2718
2719 static int __init dp_init(void)
2720 {
2721         int err;
2722
2723         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) >
2724                      sizeof_field(struct sk_buff, cb));
2725
2726         pr_info("Open vSwitch switching datapath\n");
2727
2728         err = action_fifos_init();
2729         if (err)
2730                 goto error;
2731
2732         err = ovs_internal_dev_rtnl_link_register();
2733         if (err)
2734                 goto error_action_fifos_exit;
2735
2736         err = ovs_flow_init();
2737         if (err)
2738                 goto error_unreg_rtnl_link;
2739
2740         err = ovs_vport_init();
2741         if (err)
2742                 goto error_flow_exit;
2743
2744         err = register_pernet_device(&ovs_net_ops);
2745         if (err)
2746                 goto error_vport_exit;
2747
2748         err = register_netdevice_notifier(&ovs_dp_device_notifier);
2749         if (err)
2750                 goto error_netns_exit;
2751
2752         err = ovs_netdev_init();
2753         if (err)
2754                 goto error_unreg_notifier;
2755
2756         err = dp_register_genl();
2757         if (err < 0)
2758                 goto error_unreg_netdev;
2759
2760         drop_reasons_register_subsys(SKB_DROP_REASON_SUBSYS_OPENVSWITCH,
2761                                      &drop_reason_list_ovs);
2762
2763         return 0;
2764
2765 error_unreg_netdev:
2766         ovs_netdev_exit();
2767 error_unreg_notifier:
2768         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2769 error_netns_exit:
2770         unregister_pernet_device(&ovs_net_ops);
2771 error_vport_exit:
2772         ovs_vport_exit();
2773 error_flow_exit:
2774         ovs_flow_exit();
2775 error_unreg_rtnl_link:
2776         ovs_internal_dev_rtnl_link_unregister();
2777 error_action_fifos_exit:
2778         action_fifos_exit();
2779 error:
2780         return err;
2781 }
2782
2783 static void dp_cleanup(void)
2784 {
2785         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2786         ovs_netdev_exit();
2787         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2788         unregister_pernet_device(&ovs_net_ops);
2789         drop_reasons_unregister_subsys(SKB_DROP_REASON_SUBSYS_OPENVSWITCH);
2790         rcu_barrier();
2791         ovs_vport_exit();
2792         ovs_flow_exit();
2793         ovs_internal_dev_rtnl_link_unregister();
2794         action_fifos_exit();
2795 }
2796
2797 module_init(dp_init);
2798 module_exit(dp_cleanup);
2799
2800 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2801 MODULE_LICENSE("GPL");
2802 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2803 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2804 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2805 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2806 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
2807 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);