1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2007-2014 Nicira, Inc. 4 */ 5 6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7 8 #include <linux/init.h> 9 #include <linux/module.h> 10 #include <linux/if_arp.h> 11 #include <linux/if_vlan.h> 12 #include <linux/in.h> 13 #include <linux/ip.h> 14 #include <linux/jhash.h> 15 #include <linux/delay.h> 16 #include <linux/time.h> 17 #include <linux/etherdevice.h> 18 #include <linux/genetlink.h> 19 #include <linux/kernel.h> 20 #include <linux/kthread.h> 21 #include <linux/mutex.h> 22 #include <linux/percpu.h> 23 #include <linux/rcupdate.h> 24 #include <linux/tcp.h> 25 #include <linux/udp.h> 26 #include <linux/ethtool.h> 27 #include <linux/wait.h> 28 #include <asm/div64.h> 29 #include <linux/highmem.h> 30 #include <linux/netfilter_bridge.h> 31 #include <linux/netfilter_ipv4.h> 32 #include <linux/inetdevice.h> 33 #include <linux/list.h> 34 #include <linux/openvswitch.h> 35 #include <linux/rculist.h> 36 #include <linux/dmi.h> 37 #include <net/genetlink.h> 38 #include <net/net_namespace.h> 39 #include <net/netns/generic.h> 40 41 #include "datapath.h" 42 #include "flow.h" 43 #include "flow_table.h" 44 #include "flow_netlink.h" 45 #include "meter.h" 46 #include "vport-internal_dev.h" 47 #include "vport-netdev.h" 48 49 unsigned int ovs_net_id __read_mostly; 50 51 static struct genl_family dp_packet_genl_family; 52 static struct genl_family dp_flow_genl_family; 53 static struct genl_family dp_datapath_genl_family; 54 55 static const struct nla_policy flow_policy[]; 56 57 static const struct genl_multicast_group ovs_dp_flow_multicast_group = { 58 .name = OVS_FLOW_MCGROUP, 59 }; 60 61 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = { 62 .name = OVS_DATAPATH_MCGROUP, 63 }; 64 65 static const struct genl_multicast_group ovs_dp_vport_multicast_group = { 66 .name = OVS_VPORT_MCGROUP, 67 }; 68 69 /* Check if need to build a reply message. 70 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */ 71 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info, 72 unsigned int group) 73 { 74 return info->nlhdr->nlmsg_flags & NLM_F_ECHO || 75 genl_has_listeners(family, genl_info_net(info), group); 76 } 77 78 static void ovs_notify(struct genl_family *family, 79 struct sk_buff *skb, struct genl_info *info) 80 { 81 genl_notify(family, skb, info, 0, GFP_KERNEL); 82 } 83 84 /** 85 * DOC: Locking: 86 * 87 * All writes e.g. Writes to device state (add/remove datapath, port, set 88 * operations on vports, etc.), Writes to other state (flow table 89 * modifications, set miscellaneous datapath parameters, etc.) are protected 90 * by ovs_lock. 91 * 92 * Reads are protected by RCU. 93 * 94 * There are a few special cases (mostly stats) that have their own 95 * synchronization but they nest under all of above and don't interact with 96 * each other. 97 * 98 * The RTNL lock nests inside ovs_mutex. 99 */ 100 101 static DEFINE_MUTEX(ovs_mutex); 102 103 void ovs_lock(void) 104 { 105 mutex_lock(&ovs_mutex); 106 } 107 108 void ovs_unlock(void) 109 { 110 mutex_unlock(&ovs_mutex); 111 } 112 113 #ifdef CONFIG_LOCKDEP 114 int lockdep_ovsl_is_held(void) 115 { 116 if (debug_locks) 117 return lockdep_is_held(&ovs_mutex); 118 else 119 return 1; 120 } 121 #endif 122 123 static struct vport *new_vport(const struct vport_parms *); 124 static int queue_gso_packets(struct datapath *dp, struct sk_buff *, 125 const struct sw_flow_key *, 126 const struct dp_upcall_info *, 127 uint32_t cutlen); 128 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *, 129 const struct sw_flow_key *, 130 const struct dp_upcall_info *, 131 uint32_t cutlen); 132 133 /* Must be called with rcu_read_lock or ovs_mutex. */ 134 const char *ovs_dp_name(const struct datapath *dp) 135 { 136 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); 137 return ovs_vport_name(vport); 138 } 139 140 static int get_dpifindex(const struct datapath *dp) 141 { 142 struct vport *local; 143 int ifindex; 144 145 rcu_read_lock(); 146 147 local = ovs_vport_rcu(dp, OVSP_LOCAL); 148 if (local) 149 ifindex = local->dev->ifindex; 150 else 151 ifindex = 0; 152 153 rcu_read_unlock(); 154 155 return ifindex; 156 } 157 158 static void destroy_dp_rcu(struct rcu_head *rcu) 159 { 160 struct datapath *dp = container_of(rcu, struct datapath, rcu); 161 162 ovs_flow_tbl_destroy(&dp->table); 163 free_percpu(dp->stats_percpu); 164 kfree(dp->ports); 165 ovs_meters_exit(dp); 166 kfree(dp); 167 } 168 169 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 170 u16 port_no) 171 { 172 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 173 } 174 175 /* Called with ovs_mutex or RCU read lock. */ 176 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 177 { 178 struct vport *vport; 179 struct hlist_head *head; 180 181 head = vport_hash_bucket(dp, port_no); 182 hlist_for_each_entry_rcu(vport, head, dp_hash_node) { 183 if (vport->port_no == port_no) 184 return vport; 185 } 186 return NULL; 187 } 188 189 /* Called with ovs_mutex. */ 190 static struct vport *new_vport(const struct vport_parms *parms) 191 { 192 struct vport *vport; 193 194 vport = ovs_vport_add(parms); 195 if (!IS_ERR(vport)) { 196 struct datapath *dp = parms->dp; 197 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 198 199 hlist_add_head_rcu(&vport->dp_hash_node, head); 200 } 201 return vport; 202 } 203 204 void ovs_dp_detach_port(struct vport *p) 205 { 206 ASSERT_OVSL(); 207 208 /* First drop references to device. */ 209 hlist_del_rcu(&p->dp_hash_node); 210 211 /* Then destroy it. */ 212 ovs_vport_del(p); 213 } 214 215 /* Must be called with rcu_read_lock. */ 216 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key) 217 { 218 const struct vport *p = OVS_CB(skb)->input_vport; 219 struct datapath *dp = p->dp; 220 struct sw_flow *flow; 221 struct sw_flow_actions *sf_acts; 222 struct dp_stats_percpu *stats; 223 u64 *stats_counter; 224 u32 n_mask_hit; 225 int error; 226 227 stats = this_cpu_ptr(dp->stats_percpu); 228 229 /* Look up flow. */ 230 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb), 231 &n_mask_hit); 232 if (unlikely(!flow)) { 233 struct dp_upcall_info upcall; 234 235 memset(&upcall, 0, sizeof(upcall)); 236 upcall.cmd = OVS_PACKET_CMD_MISS; 237 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 238 upcall.mru = OVS_CB(skb)->mru; 239 error = ovs_dp_upcall(dp, skb, key, &upcall, 0); 240 if (unlikely(error)) 241 kfree_skb(skb); 242 else 243 consume_skb(skb); 244 stats_counter = &stats->n_missed; 245 goto out; 246 } 247 248 ovs_flow_stats_update(flow, key->tp.flags, skb); 249 sf_acts = rcu_dereference(flow->sf_acts); 250 error = ovs_execute_actions(dp, skb, sf_acts, key); 251 if (unlikely(error)) 252 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n", 253 ovs_dp_name(dp), error); 254 255 stats_counter = &stats->n_hit; 256 257 out: 258 /* Update datapath statistics. */ 259 u64_stats_update_begin(&stats->syncp); 260 (*stats_counter)++; 261 stats->n_mask_hit += n_mask_hit; 262 u64_stats_update_end(&stats->syncp); 263 } 264 265 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 266 const struct sw_flow_key *key, 267 const struct dp_upcall_info *upcall_info, 268 uint32_t cutlen) 269 { 270 struct dp_stats_percpu *stats; 271 int err; 272 273 if (upcall_info->portid == 0) { 274 err = -ENOTCONN; 275 goto err; 276 } 277 278 if (!skb_is_gso(skb)) 279 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 280 else 281 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen); 282 if (err) 283 goto err; 284 285 return 0; 286 287 err: 288 stats = this_cpu_ptr(dp->stats_percpu); 289 290 u64_stats_update_begin(&stats->syncp); 291 stats->n_lost++; 292 u64_stats_update_end(&stats->syncp); 293 294 return err; 295 } 296 297 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 298 const struct sw_flow_key *key, 299 const struct dp_upcall_info *upcall_info, 300 uint32_t cutlen) 301 { 302 unsigned int gso_type = skb_shinfo(skb)->gso_type; 303 struct sw_flow_key later_key; 304 struct sk_buff *segs, *nskb; 305 int err; 306 307 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET); 308 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 309 if (IS_ERR(segs)) 310 return PTR_ERR(segs); 311 if (segs == NULL) 312 return -EINVAL; 313 314 if (gso_type & SKB_GSO_UDP) { 315 /* The initial flow key extracted by ovs_flow_key_extract() 316 * in this case is for a first fragment, so we need to 317 * properly mark later fragments. 318 */ 319 later_key = *key; 320 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 321 } 322 323 /* Queue all of the segments. */ 324 skb = segs; 325 do { 326 if (gso_type & SKB_GSO_UDP && skb != segs) 327 key = &later_key; 328 329 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 330 if (err) 331 break; 332 333 } while ((skb = skb->next)); 334 335 /* Free all of the segments. */ 336 skb = segs; 337 do { 338 nskb = skb->next; 339 if (err) 340 kfree_skb(skb); 341 else 342 consume_skb(skb); 343 } while ((skb = nskb)); 344 return err; 345 } 346 347 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, 348 unsigned int hdrlen, int actions_attrlen) 349 { 350 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 351 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 352 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */ 353 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */ 354 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */ 355 356 /* OVS_PACKET_ATTR_USERDATA */ 357 if (upcall_info->userdata) 358 size += NLA_ALIGN(upcall_info->userdata->nla_len); 359 360 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ 361 if (upcall_info->egress_tun_info) 362 size += nla_total_size(ovs_tun_key_attr_size()); 363 364 /* OVS_PACKET_ATTR_ACTIONS */ 365 if (upcall_info->actions_len) 366 size += nla_total_size(actions_attrlen); 367 368 /* OVS_PACKET_ATTR_MRU */ 369 if (upcall_info->mru) 370 size += nla_total_size(sizeof(upcall_info->mru)); 371 372 return size; 373 } 374 375 static void pad_packet(struct datapath *dp, struct sk_buff *skb) 376 { 377 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 378 size_t plen = NLA_ALIGN(skb->len) - skb->len; 379 380 if (plen > 0) 381 skb_put_zero(skb, plen); 382 } 383 } 384 385 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 386 const struct sw_flow_key *key, 387 const struct dp_upcall_info *upcall_info, 388 uint32_t cutlen) 389 { 390 struct ovs_header *upcall; 391 struct sk_buff *nskb = NULL; 392 struct sk_buff *user_skb = NULL; /* to be queued to userspace */ 393 struct nlattr *nla; 394 size_t len; 395 unsigned int hlen; 396 int err, dp_ifindex; 397 u64 hash; 398 399 dp_ifindex = get_dpifindex(dp); 400 if (!dp_ifindex) 401 return -ENODEV; 402 403 if (skb_vlan_tag_present(skb)) { 404 nskb = skb_clone(skb, GFP_ATOMIC); 405 if (!nskb) 406 return -ENOMEM; 407 408 nskb = __vlan_hwaccel_push_inside(nskb); 409 if (!nskb) 410 return -ENOMEM; 411 412 skb = nskb; 413 } 414 415 if (nla_attr_size(skb->len) > USHRT_MAX) { 416 err = -EFBIG; 417 goto out; 418 } 419 420 /* Complete checksum if needed */ 421 if (skb->ip_summed == CHECKSUM_PARTIAL && 422 (err = skb_csum_hwoffload_help(skb, 0))) 423 goto out; 424 425 /* Older versions of OVS user space enforce alignment of the last 426 * Netlink attribute to NLA_ALIGNTO which would require extensive 427 * padding logic. Only perform zerocopy if padding is not required. 428 */ 429 if (dp->user_features & OVS_DP_F_UNALIGNED) 430 hlen = skb_zerocopy_headlen(skb); 431 else 432 hlen = skb->len; 433 434 len = upcall_msg_size(upcall_info, hlen - cutlen, 435 OVS_CB(skb)->acts_origlen); 436 user_skb = genlmsg_new(len, GFP_ATOMIC); 437 if (!user_skb) { 438 err = -ENOMEM; 439 goto out; 440 } 441 442 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 443 0, upcall_info->cmd); 444 if (!upcall) { 445 err = -EINVAL; 446 goto out; 447 } 448 upcall->dp_ifindex = dp_ifindex; 449 450 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); 451 if (err) 452 goto out; 453 454 if (upcall_info->userdata) 455 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 456 nla_len(upcall_info->userdata), 457 nla_data(upcall_info->userdata)); 458 459 if (upcall_info->egress_tun_info) { 460 nla = nla_nest_start_noflag(user_skb, 461 OVS_PACKET_ATTR_EGRESS_TUN_KEY); 462 if (!nla) { 463 err = -EMSGSIZE; 464 goto out; 465 } 466 err = ovs_nla_put_tunnel_info(user_skb, 467 upcall_info->egress_tun_info); 468 if (err) 469 goto out; 470 471 nla_nest_end(user_skb, nla); 472 } 473 474 if (upcall_info->actions_len) { 475 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS); 476 if (!nla) { 477 err = -EMSGSIZE; 478 goto out; 479 } 480 err = ovs_nla_put_actions(upcall_info->actions, 481 upcall_info->actions_len, 482 user_skb); 483 if (!err) 484 nla_nest_end(user_skb, nla); 485 else 486 nla_nest_cancel(user_skb, nla); 487 } 488 489 /* Add OVS_PACKET_ATTR_MRU */ 490 if (upcall_info->mru && 491 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) { 492 err = -ENOBUFS; 493 goto out; 494 } 495 496 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */ 497 if (cutlen > 0 && 498 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) { 499 err = -ENOBUFS; 500 goto out; 501 } 502 503 /* Add OVS_PACKET_ATTR_HASH */ 504 hash = skb_get_hash_raw(skb); 505 if (skb->sw_hash) 506 hash |= OVS_PACKET_HASH_SW_BIT; 507 508 if (skb->l4_hash) 509 hash |= OVS_PACKET_HASH_L4_BIT; 510 511 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) { 512 err = -ENOBUFS; 513 goto out; 514 } 515 516 /* Only reserve room for attribute header, packet data is added 517 * in skb_zerocopy() */ 518 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 519 err = -ENOBUFS; 520 goto out; 521 } 522 nla->nla_len = nla_attr_size(skb->len - cutlen); 523 524 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen); 525 if (err) 526 goto out; 527 528 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 529 pad_packet(dp, user_skb); 530 531 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 532 533 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 534 user_skb = NULL; 535 out: 536 if (err) 537 skb_tx_error(skb); 538 kfree_skb(user_skb); 539 kfree_skb(nskb); 540 return err; 541 } 542 543 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 544 { 545 struct ovs_header *ovs_header = info->userhdr; 546 struct net *net = sock_net(skb->sk); 547 struct nlattr **a = info->attrs; 548 struct sw_flow_actions *acts; 549 struct sk_buff *packet; 550 struct sw_flow *flow; 551 struct sw_flow_actions *sf_acts; 552 struct datapath *dp; 553 struct vport *input_vport; 554 u16 mru = 0; 555 u64 hash; 556 int len; 557 int err; 558 bool log = !a[OVS_PACKET_ATTR_PROBE]; 559 560 err = -EINVAL; 561 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 562 !a[OVS_PACKET_ATTR_ACTIONS]) 563 goto err; 564 565 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 566 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 567 err = -ENOMEM; 568 if (!packet) 569 goto err; 570 skb_reserve(packet, NET_IP_ALIGN); 571 572 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 573 574 /* Set packet's mru */ 575 if (a[OVS_PACKET_ATTR_MRU]) { 576 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]); 577 packet->ignore_df = 1; 578 } 579 OVS_CB(packet)->mru = mru; 580 581 if (a[OVS_PACKET_ATTR_HASH]) { 582 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]); 583 584 __skb_set_hash(packet, hash & 0xFFFFFFFFULL, 585 !!(hash & OVS_PACKET_HASH_SW_BIT), 586 !!(hash & OVS_PACKET_HASH_L4_BIT)); 587 } 588 589 /* Build an sw_flow for sending this packet. */ 590 flow = ovs_flow_alloc(); 591 err = PTR_ERR(flow); 592 if (IS_ERR(flow)) 593 goto err_kfree_skb; 594 595 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY], 596 packet, &flow->key, log); 597 if (err) 598 goto err_flow_free; 599 600 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS], 601 &flow->key, &acts, log); 602 if (err) 603 goto err_flow_free; 604 605 rcu_assign_pointer(flow->sf_acts, acts); 606 packet->priority = flow->key.phy.priority; 607 packet->mark = flow->key.phy.skb_mark; 608 609 rcu_read_lock(); 610 dp = get_dp_rcu(net, ovs_header->dp_ifindex); 611 err = -ENODEV; 612 if (!dp) 613 goto err_unlock; 614 615 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 616 if (!input_vport) 617 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 618 619 if (!input_vport) 620 goto err_unlock; 621 622 packet->dev = input_vport->dev; 623 OVS_CB(packet)->input_vport = input_vport; 624 sf_acts = rcu_dereference(flow->sf_acts); 625 626 local_bh_disable(); 627 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); 628 local_bh_enable(); 629 rcu_read_unlock(); 630 631 ovs_flow_free(flow, false); 632 return err; 633 634 err_unlock: 635 rcu_read_unlock(); 636 err_flow_free: 637 ovs_flow_free(flow, false); 638 err_kfree_skb: 639 kfree_skb(packet); 640 err: 641 return err; 642 } 643 644 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 645 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 646 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 647 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 648 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, 649 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, 650 }; 651 652 static const struct genl_ops dp_packet_genl_ops[] = { 653 { .cmd = OVS_PACKET_CMD_EXECUTE, 654 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 655 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 656 .doit = ovs_packet_cmd_execute 657 } 658 }; 659 660 static struct genl_family dp_packet_genl_family __ro_after_init = { 661 .hdrsize = sizeof(struct ovs_header), 662 .name = OVS_PACKET_FAMILY, 663 .version = OVS_PACKET_VERSION, 664 .maxattr = OVS_PACKET_ATTR_MAX, 665 .policy = packet_policy, 666 .netnsok = true, 667 .parallel_ops = true, 668 .ops = dp_packet_genl_ops, 669 .n_ops = ARRAY_SIZE(dp_packet_genl_ops), 670 .module = THIS_MODULE, 671 }; 672 673 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 674 struct ovs_dp_megaflow_stats *mega_stats) 675 { 676 int i; 677 678 memset(mega_stats, 0, sizeof(*mega_stats)); 679 680 stats->n_flows = ovs_flow_tbl_count(&dp->table); 681 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 682 683 stats->n_hit = stats->n_missed = stats->n_lost = 0; 684 685 for_each_possible_cpu(i) { 686 const struct dp_stats_percpu *percpu_stats; 687 struct dp_stats_percpu local_stats; 688 unsigned int start; 689 690 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 691 692 do { 693 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 694 local_stats = *percpu_stats; 695 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 696 697 stats->n_hit += local_stats.n_hit; 698 stats->n_missed += local_stats.n_missed; 699 stats->n_lost += local_stats.n_lost; 700 mega_stats->n_mask_hit += local_stats.n_mask_hit; 701 } 702 } 703 704 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) 705 { 706 return ovs_identifier_is_ufid(sfid) && 707 !(ufid_flags & OVS_UFID_F_OMIT_KEY); 708 } 709 710 static bool should_fill_mask(uint32_t ufid_flags) 711 { 712 return !(ufid_flags & OVS_UFID_F_OMIT_MASK); 713 } 714 715 static bool should_fill_actions(uint32_t ufid_flags) 716 { 717 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); 718 } 719 720 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, 721 const struct sw_flow_id *sfid, 722 uint32_t ufid_flags) 723 { 724 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); 725 726 /* OVS_FLOW_ATTR_UFID */ 727 if (sfid && ovs_identifier_is_ufid(sfid)) 728 len += nla_total_size(sfid->ufid_len); 729 730 /* OVS_FLOW_ATTR_KEY */ 731 if (!sfid || should_fill_key(sfid, ufid_flags)) 732 len += nla_total_size(ovs_key_attr_size()); 733 734 /* OVS_FLOW_ATTR_MASK */ 735 if (should_fill_mask(ufid_flags)) 736 len += nla_total_size(ovs_key_attr_size()); 737 738 /* OVS_FLOW_ATTR_ACTIONS */ 739 if (should_fill_actions(ufid_flags)) 740 len += nla_total_size(acts->orig_len); 741 742 return len 743 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 744 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 745 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */ 746 } 747 748 /* Called with ovs_mutex or RCU read lock. */ 749 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 750 struct sk_buff *skb) 751 { 752 struct ovs_flow_stats stats; 753 __be16 tcp_flags; 754 unsigned long used; 755 756 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 757 758 if (used && 759 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used), 760 OVS_FLOW_ATTR_PAD)) 761 return -EMSGSIZE; 762 763 if (stats.n_packets && 764 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS, 765 sizeof(struct ovs_flow_stats), &stats, 766 OVS_FLOW_ATTR_PAD)) 767 return -EMSGSIZE; 768 769 if ((u8)ntohs(tcp_flags) && 770 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 771 return -EMSGSIZE; 772 773 return 0; 774 } 775 776 /* Called with ovs_mutex or RCU read lock. */ 777 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 778 struct sk_buff *skb, int skb_orig_len) 779 { 780 struct nlattr *start; 781 int err; 782 783 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 784 * this is the first flow to be dumped into 'skb'. This is unusual for 785 * Netlink but individual action lists can be longer than 786 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 787 * The userspace caller can always fetch the actions separately if it 788 * really wants them. (Most userspace callers in fact don't care.) 789 * 790 * This can only fail for dump operations because the skb is always 791 * properly sized for single flows. 792 */ 793 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS); 794 if (start) { 795 const struct sw_flow_actions *sf_acts; 796 797 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 798 err = ovs_nla_put_actions(sf_acts->actions, 799 sf_acts->actions_len, skb); 800 801 if (!err) 802 nla_nest_end(skb, start); 803 else { 804 if (skb_orig_len) 805 return err; 806 807 nla_nest_cancel(skb, start); 808 } 809 } else if (skb_orig_len) { 810 return -EMSGSIZE; 811 } 812 813 return 0; 814 } 815 816 /* Called with ovs_mutex or RCU read lock. */ 817 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 818 struct sk_buff *skb, u32 portid, 819 u32 seq, u32 flags, u8 cmd, u32 ufid_flags) 820 { 821 const int skb_orig_len = skb->len; 822 struct ovs_header *ovs_header; 823 int err; 824 825 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 826 flags, cmd); 827 if (!ovs_header) 828 return -EMSGSIZE; 829 830 ovs_header->dp_ifindex = dp_ifindex; 831 832 err = ovs_nla_put_identifier(flow, skb); 833 if (err) 834 goto error; 835 836 if (should_fill_key(&flow->id, ufid_flags)) { 837 err = ovs_nla_put_masked_key(flow, skb); 838 if (err) 839 goto error; 840 } 841 842 if (should_fill_mask(ufid_flags)) { 843 err = ovs_nla_put_mask(flow, skb); 844 if (err) 845 goto error; 846 } 847 848 err = ovs_flow_cmd_fill_stats(flow, skb); 849 if (err) 850 goto error; 851 852 if (should_fill_actions(ufid_flags)) { 853 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 854 if (err) 855 goto error; 856 } 857 858 genlmsg_end(skb, ovs_header); 859 return 0; 860 861 error: 862 genlmsg_cancel(skb, ovs_header); 863 return err; 864 } 865 866 /* May not be called with RCU read lock. */ 867 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 868 const struct sw_flow_id *sfid, 869 struct genl_info *info, 870 bool always, 871 uint32_t ufid_flags) 872 { 873 struct sk_buff *skb; 874 size_t len; 875 876 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 877 return NULL; 878 879 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); 880 skb = genlmsg_new(len, GFP_KERNEL); 881 if (!skb) 882 return ERR_PTR(-ENOMEM); 883 884 return skb; 885 } 886 887 /* Called with ovs_mutex. */ 888 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 889 int dp_ifindex, 890 struct genl_info *info, u8 cmd, 891 bool always, u32 ufid_flags) 892 { 893 struct sk_buff *skb; 894 int retval; 895 896 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), 897 &flow->id, info, always, ufid_flags); 898 if (IS_ERR_OR_NULL(skb)) 899 return skb; 900 901 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 902 info->snd_portid, info->snd_seq, 0, 903 cmd, ufid_flags); 904 BUG_ON(retval < 0); 905 return skb; 906 } 907 908 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 909 { 910 struct net *net = sock_net(skb->sk); 911 struct nlattr **a = info->attrs; 912 struct ovs_header *ovs_header = info->userhdr; 913 struct sw_flow *flow = NULL, *new_flow; 914 struct sw_flow_mask mask; 915 struct sk_buff *reply; 916 struct datapath *dp; 917 struct sw_flow_actions *acts; 918 struct sw_flow_match match; 919 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 920 int error; 921 bool log = !a[OVS_FLOW_ATTR_PROBE]; 922 923 /* Must have key and actions. */ 924 error = -EINVAL; 925 if (!a[OVS_FLOW_ATTR_KEY]) { 926 OVS_NLERR(log, "Flow key attr not present in new flow."); 927 goto error; 928 } 929 if (!a[OVS_FLOW_ATTR_ACTIONS]) { 930 OVS_NLERR(log, "Flow actions attr not present in new flow."); 931 goto error; 932 } 933 934 /* Most of the time we need to allocate a new flow, do it before 935 * locking. 936 */ 937 new_flow = ovs_flow_alloc(); 938 if (IS_ERR(new_flow)) { 939 error = PTR_ERR(new_flow); 940 goto error; 941 } 942 943 /* Extract key. */ 944 ovs_match_init(&match, &new_flow->key, false, &mask); 945 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 946 a[OVS_FLOW_ATTR_MASK], log); 947 if (error) 948 goto err_kfree_flow; 949 950 /* Extract flow identifier. */ 951 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID], 952 &new_flow->key, log); 953 if (error) 954 goto err_kfree_flow; 955 956 /* unmasked key is needed to match when ufid is not used. */ 957 if (ovs_identifier_is_key(&new_flow->id)) 958 match.key = new_flow->id.unmasked_key; 959 960 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask); 961 962 /* Validate actions. */ 963 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS], 964 &new_flow->key, &acts, log); 965 if (error) { 966 OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); 967 goto err_kfree_flow; 968 } 969 970 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false, 971 ufid_flags); 972 if (IS_ERR(reply)) { 973 error = PTR_ERR(reply); 974 goto err_kfree_acts; 975 } 976 977 ovs_lock(); 978 dp = get_dp(net, ovs_header->dp_ifindex); 979 if (unlikely(!dp)) { 980 error = -ENODEV; 981 goto err_unlock_ovs; 982 } 983 984 /* Check if this is a duplicate flow */ 985 if (ovs_identifier_is_ufid(&new_flow->id)) 986 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id); 987 if (!flow) 988 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key); 989 if (likely(!flow)) { 990 rcu_assign_pointer(new_flow->sf_acts, acts); 991 992 /* Put flow in bucket. */ 993 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 994 if (unlikely(error)) { 995 acts = NULL; 996 goto err_unlock_ovs; 997 } 998 999 if (unlikely(reply)) { 1000 error = ovs_flow_cmd_fill_info(new_flow, 1001 ovs_header->dp_ifindex, 1002 reply, info->snd_portid, 1003 info->snd_seq, 0, 1004 OVS_FLOW_CMD_NEW, 1005 ufid_flags); 1006 BUG_ON(error < 0); 1007 } 1008 ovs_unlock(); 1009 } else { 1010 struct sw_flow_actions *old_acts; 1011 1012 /* Bail out if we're not allowed to modify an existing flow. 1013 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 1014 * because Generic Netlink treats the latter as a dump 1015 * request. We also accept NLM_F_EXCL in case that bug ever 1016 * gets fixed. 1017 */ 1018 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 1019 | NLM_F_EXCL))) { 1020 error = -EEXIST; 1021 goto err_unlock_ovs; 1022 } 1023 /* The flow identifier has to be the same for flow updates. 1024 * Look for any overlapping flow. 1025 */ 1026 if (unlikely(!ovs_flow_cmp(flow, &match))) { 1027 if (ovs_identifier_is_key(&flow->id)) 1028 flow = ovs_flow_tbl_lookup_exact(&dp->table, 1029 &match); 1030 else /* UFID matches but key is different */ 1031 flow = NULL; 1032 if (!flow) { 1033 error = -ENOENT; 1034 goto err_unlock_ovs; 1035 } 1036 } 1037 /* Update actions. */ 1038 old_acts = ovsl_dereference(flow->sf_acts); 1039 rcu_assign_pointer(flow->sf_acts, acts); 1040 1041 if (unlikely(reply)) { 1042 error = ovs_flow_cmd_fill_info(flow, 1043 ovs_header->dp_ifindex, 1044 reply, info->snd_portid, 1045 info->snd_seq, 0, 1046 OVS_FLOW_CMD_NEW, 1047 ufid_flags); 1048 BUG_ON(error < 0); 1049 } 1050 ovs_unlock(); 1051 1052 ovs_nla_free_flow_actions_rcu(old_acts); 1053 ovs_flow_free(new_flow, false); 1054 } 1055 1056 if (reply) 1057 ovs_notify(&dp_flow_genl_family, reply, info); 1058 return 0; 1059 1060 err_unlock_ovs: 1061 ovs_unlock(); 1062 kfree_skb(reply); 1063 err_kfree_acts: 1064 ovs_nla_free_flow_actions(acts); 1065 err_kfree_flow: 1066 ovs_flow_free(new_flow, false); 1067 error: 1068 return error; 1069 } 1070 1071 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ 1072 static noinline_for_stack struct sw_flow_actions *get_flow_actions(struct net *net, 1073 const struct nlattr *a, 1074 const struct sw_flow_key *key, 1075 const struct sw_flow_mask *mask, 1076 bool log) 1077 { 1078 struct sw_flow_actions *acts; 1079 struct sw_flow_key masked_key; 1080 int error; 1081 1082 ovs_flow_mask_key(&masked_key, key, true, mask); 1083 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log); 1084 if (error) { 1085 OVS_NLERR(log, 1086 "Actions may not be safe on all matching packets"); 1087 return ERR_PTR(error); 1088 } 1089 1090 return acts; 1091 } 1092 1093 /* Factor out match-init and action-copy to avoid 1094 * "Wframe-larger-than=1024" warning. Because mask is only 1095 * used to get actions, we new a function to save some 1096 * stack space. 1097 * 1098 * If there are not key and action attrs, we return 0 1099 * directly. In the case, the caller will also not use the 1100 * match as before. If there is action attr, we try to get 1101 * actions and save them to *acts. Before returning from 1102 * the function, we reset the match->mask pointer. Because 1103 * we should not to return match object with dangling reference 1104 * to mask. 1105 * */ 1106 static noinline_for_stack int 1107 ovs_nla_init_match_and_action(struct net *net, 1108 struct sw_flow_match *match, 1109 struct sw_flow_key *key, 1110 struct nlattr **a, 1111 struct sw_flow_actions **acts, 1112 bool log) 1113 { 1114 struct sw_flow_mask mask; 1115 int error = 0; 1116 1117 if (a[OVS_FLOW_ATTR_KEY]) { 1118 ovs_match_init(match, key, true, &mask); 1119 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY], 1120 a[OVS_FLOW_ATTR_MASK], log); 1121 if (error) 1122 goto error; 1123 } 1124 1125 if (a[OVS_FLOW_ATTR_ACTIONS]) { 1126 if (!a[OVS_FLOW_ATTR_KEY]) { 1127 OVS_NLERR(log, 1128 "Flow key attribute not present in set flow."); 1129 error = -EINVAL; 1130 goto error; 1131 } 1132 1133 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key, 1134 &mask, log); 1135 if (IS_ERR(*acts)) { 1136 error = PTR_ERR(*acts); 1137 goto error; 1138 } 1139 } 1140 1141 /* On success, error is 0. */ 1142 error: 1143 match->mask = NULL; 1144 return error; 1145 } 1146 1147 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 1148 { 1149 struct net *net = sock_net(skb->sk); 1150 struct nlattr **a = info->attrs; 1151 struct ovs_header *ovs_header = info->userhdr; 1152 struct sw_flow_key key; 1153 struct sw_flow *flow; 1154 struct sk_buff *reply = NULL; 1155 struct datapath *dp; 1156 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 1157 struct sw_flow_match match; 1158 struct sw_flow_id sfid; 1159 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1160 int error = 0; 1161 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1162 bool ufid_present; 1163 1164 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); 1165 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) { 1166 OVS_NLERR(log, 1167 "Flow set message rejected, Key attribute missing."); 1168 return -EINVAL; 1169 } 1170 1171 error = ovs_nla_init_match_and_action(net, &match, &key, a, 1172 &acts, log); 1173 if (error) 1174 goto error; 1175 1176 if (acts) { 1177 /* Can allocate before locking if have acts. */ 1178 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false, 1179 ufid_flags); 1180 if (IS_ERR(reply)) { 1181 error = PTR_ERR(reply); 1182 goto err_kfree_acts; 1183 } 1184 } 1185 1186 ovs_lock(); 1187 dp = get_dp(net, ovs_header->dp_ifindex); 1188 if (unlikely(!dp)) { 1189 error = -ENODEV; 1190 goto err_unlock_ovs; 1191 } 1192 /* Check that the flow exists. */ 1193 if (ufid_present) 1194 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid); 1195 else 1196 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1197 if (unlikely(!flow)) { 1198 error = -ENOENT; 1199 goto err_unlock_ovs; 1200 } 1201 1202 /* Update actions, if present. */ 1203 if (likely(acts)) { 1204 old_acts = ovsl_dereference(flow->sf_acts); 1205 rcu_assign_pointer(flow->sf_acts, acts); 1206 1207 if (unlikely(reply)) { 1208 error = ovs_flow_cmd_fill_info(flow, 1209 ovs_header->dp_ifindex, 1210 reply, info->snd_portid, 1211 info->snd_seq, 0, 1212 OVS_FLOW_CMD_SET, 1213 ufid_flags); 1214 BUG_ON(error < 0); 1215 } 1216 } else { 1217 /* Could not alloc without acts before locking. */ 1218 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1219 info, OVS_FLOW_CMD_SET, false, 1220 ufid_flags); 1221 1222 if (IS_ERR(reply)) { 1223 error = PTR_ERR(reply); 1224 goto err_unlock_ovs; 1225 } 1226 } 1227 1228 /* Clear stats. */ 1229 if (a[OVS_FLOW_ATTR_CLEAR]) 1230 ovs_flow_stats_clear(flow); 1231 ovs_unlock(); 1232 1233 if (reply) 1234 ovs_notify(&dp_flow_genl_family, reply, info); 1235 if (old_acts) 1236 ovs_nla_free_flow_actions_rcu(old_acts); 1237 1238 return 0; 1239 1240 err_unlock_ovs: 1241 ovs_unlock(); 1242 kfree_skb(reply); 1243 err_kfree_acts: 1244 ovs_nla_free_flow_actions(acts); 1245 error: 1246 return error; 1247 } 1248 1249 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1250 { 1251 struct nlattr **a = info->attrs; 1252 struct ovs_header *ovs_header = info->userhdr; 1253 struct net *net = sock_net(skb->sk); 1254 struct sw_flow_key key; 1255 struct sk_buff *reply; 1256 struct sw_flow *flow; 1257 struct datapath *dp; 1258 struct sw_flow_match match; 1259 struct sw_flow_id ufid; 1260 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1261 int err = 0; 1262 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1263 bool ufid_present; 1264 1265 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1266 if (a[OVS_FLOW_ATTR_KEY]) { 1267 ovs_match_init(&match, &key, true, NULL); 1268 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL, 1269 log); 1270 } else if (!ufid_present) { 1271 OVS_NLERR(log, 1272 "Flow get message rejected, Key attribute missing."); 1273 err = -EINVAL; 1274 } 1275 if (err) 1276 return err; 1277 1278 ovs_lock(); 1279 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1280 if (!dp) { 1281 err = -ENODEV; 1282 goto unlock; 1283 } 1284 1285 if (ufid_present) 1286 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1287 else 1288 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1289 if (!flow) { 1290 err = -ENOENT; 1291 goto unlock; 1292 } 1293 1294 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1295 OVS_FLOW_CMD_GET, true, ufid_flags); 1296 if (IS_ERR(reply)) { 1297 err = PTR_ERR(reply); 1298 goto unlock; 1299 } 1300 1301 ovs_unlock(); 1302 return genlmsg_reply(reply, info); 1303 unlock: 1304 ovs_unlock(); 1305 return err; 1306 } 1307 1308 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1309 { 1310 struct nlattr **a = info->attrs; 1311 struct ovs_header *ovs_header = info->userhdr; 1312 struct net *net = sock_net(skb->sk); 1313 struct sw_flow_key key; 1314 struct sk_buff *reply; 1315 struct sw_flow *flow = NULL; 1316 struct datapath *dp; 1317 struct sw_flow_match match; 1318 struct sw_flow_id ufid; 1319 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1320 int err; 1321 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1322 bool ufid_present; 1323 1324 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1325 if (a[OVS_FLOW_ATTR_KEY]) { 1326 ovs_match_init(&match, &key, true, NULL); 1327 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1328 NULL, log); 1329 if (unlikely(err)) 1330 return err; 1331 } 1332 1333 ovs_lock(); 1334 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1335 if (unlikely(!dp)) { 1336 err = -ENODEV; 1337 goto unlock; 1338 } 1339 1340 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) { 1341 err = ovs_flow_tbl_flush(&dp->table); 1342 goto unlock; 1343 } 1344 1345 if (ufid_present) 1346 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1347 else 1348 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1349 if (unlikely(!flow)) { 1350 err = -ENOENT; 1351 goto unlock; 1352 } 1353 1354 ovs_flow_tbl_remove(&dp->table, flow); 1355 ovs_unlock(); 1356 1357 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1358 &flow->id, info, false, ufid_flags); 1359 if (likely(reply)) { 1360 if (!IS_ERR(reply)) { 1361 rcu_read_lock(); /*To keep RCU checker happy. */ 1362 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1363 reply, info->snd_portid, 1364 info->snd_seq, 0, 1365 OVS_FLOW_CMD_DEL, 1366 ufid_flags); 1367 rcu_read_unlock(); 1368 BUG_ON(err < 0); 1369 1370 ovs_notify(&dp_flow_genl_family, reply, info); 1371 } else { 1372 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply)); 1373 } 1374 } 1375 1376 ovs_flow_free(flow, true); 1377 return 0; 1378 unlock: 1379 ovs_unlock(); 1380 return err; 1381 } 1382 1383 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1384 { 1385 struct nlattr *a[__OVS_FLOW_ATTR_MAX]; 1386 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1387 struct table_instance *ti; 1388 struct datapath *dp; 1389 u32 ufid_flags; 1390 int err; 1391 1392 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a, 1393 OVS_FLOW_ATTR_MAX, flow_policy, NULL); 1394 if (err) 1395 return err; 1396 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1397 1398 rcu_read_lock(); 1399 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1400 if (!dp) { 1401 rcu_read_unlock(); 1402 return -ENODEV; 1403 } 1404 1405 ti = rcu_dereference(dp->table.ti); 1406 for (;;) { 1407 struct sw_flow *flow; 1408 u32 bucket, obj; 1409 1410 bucket = cb->args[0]; 1411 obj = cb->args[1]; 1412 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1413 if (!flow) 1414 break; 1415 1416 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1417 NETLINK_CB(cb->skb).portid, 1418 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1419 OVS_FLOW_CMD_GET, ufid_flags) < 0) 1420 break; 1421 1422 cb->args[0] = bucket; 1423 cb->args[1] = obj; 1424 } 1425 rcu_read_unlock(); 1426 return skb->len; 1427 } 1428 1429 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1430 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1431 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1432 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1433 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1434 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1435 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, 1436 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, 1437 }; 1438 1439 static const struct genl_ops dp_flow_genl_ops[] = { 1440 { .cmd = OVS_FLOW_CMD_NEW, 1441 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1442 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1443 .doit = ovs_flow_cmd_new 1444 }, 1445 { .cmd = OVS_FLOW_CMD_DEL, 1446 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1447 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1448 .doit = ovs_flow_cmd_del 1449 }, 1450 { .cmd = OVS_FLOW_CMD_GET, 1451 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1452 .flags = 0, /* OK for unprivileged users. */ 1453 .doit = ovs_flow_cmd_get, 1454 .dumpit = ovs_flow_cmd_dump 1455 }, 1456 { .cmd = OVS_FLOW_CMD_SET, 1457 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1458 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1459 .doit = ovs_flow_cmd_set, 1460 }, 1461 }; 1462 1463 static struct genl_family dp_flow_genl_family __ro_after_init = { 1464 .hdrsize = sizeof(struct ovs_header), 1465 .name = OVS_FLOW_FAMILY, 1466 .version = OVS_FLOW_VERSION, 1467 .maxattr = OVS_FLOW_ATTR_MAX, 1468 .policy = flow_policy, 1469 .netnsok = true, 1470 .parallel_ops = true, 1471 .ops = dp_flow_genl_ops, 1472 .n_ops = ARRAY_SIZE(dp_flow_genl_ops), 1473 .mcgrps = &ovs_dp_flow_multicast_group, 1474 .n_mcgrps = 1, 1475 .module = THIS_MODULE, 1476 }; 1477 1478 static size_t ovs_dp_cmd_msg_size(void) 1479 { 1480 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1481 1482 msgsize += nla_total_size(IFNAMSIZ); 1483 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats)); 1484 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats)); 1485 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1486 1487 return msgsize; 1488 } 1489 1490 /* Called with ovs_mutex. */ 1491 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1492 u32 portid, u32 seq, u32 flags, u8 cmd) 1493 { 1494 struct ovs_header *ovs_header; 1495 struct ovs_dp_stats dp_stats; 1496 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1497 int err; 1498 1499 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1500 flags, cmd); 1501 if (!ovs_header) 1502 goto error; 1503 1504 ovs_header->dp_ifindex = get_dpifindex(dp); 1505 1506 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1507 if (err) 1508 goto nla_put_failure; 1509 1510 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1511 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1512 &dp_stats, OVS_DP_ATTR_PAD)) 1513 goto nla_put_failure; 1514 1515 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1516 sizeof(struct ovs_dp_megaflow_stats), 1517 &dp_megaflow_stats, OVS_DP_ATTR_PAD)) 1518 goto nla_put_failure; 1519 1520 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1521 goto nla_put_failure; 1522 1523 genlmsg_end(skb, ovs_header); 1524 return 0; 1525 1526 nla_put_failure: 1527 genlmsg_cancel(skb, ovs_header); 1528 error: 1529 return -EMSGSIZE; 1530 } 1531 1532 static struct sk_buff *ovs_dp_cmd_alloc_info(void) 1533 { 1534 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL); 1535 } 1536 1537 /* Called with rcu_read_lock or ovs_mutex. */ 1538 static struct datapath *lookup_datapath(struct net *net, 1539 const struct ovs_header *ovs_header, 1540 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1541 { 1542 struct datapath *dp; 1543 1544 if (!a[OVS_DP_ATTR_NAME]) 1545 dp = get_dp(net, ovs_header->dp_ifindex); 1546 else { 1547 struct vport *vport; 1548 1549 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1550 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1551 } 1552 return dp ? dp : ERR_PTR(-ENODEV); 1553 } 1554 1555 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info) 1556 { 1557 struct datapath *dp; 1558 1559 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1560 if (IS_ERR(dp)) 1561 return; 1562 1563 WARN(dp->user_features, "Dropping previously announced user features\n"); 1564 dp->user_features = 0; 1565 } 1566 1567 DEFINE_STATIC_KEY_FALSE(tc_recirc_sharing_support); 1568 1569 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1570 { 1571 u32 user_features = 0; 1572 1573 if (a[OVS_DP_ATTR_USER_FEATURES]) { 1574 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1575 1576 if (user_features & ~(OVS_DP_F_VPORT_PIDS | 1577 OVS_DP_F_UNALIGNED | 1578 OVS_DP_F_TC_RECIRC_SHARING)) 1579 return -EOPNOTSUPP; 1580 1581 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT) 1582 if (user_features & OVS_DP_F_TC_RECIRC_SHARING) 1583 return -EOPNOTSUPP; 1584 #endif 1585 } 1586 1587 dp->user_features = user_features; 1588 1589 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) 1590 static_branch_enable(&tc_recirc_sharing_support); 1591 else 1592 static_branch_disable(&tc_recirc_sharing_support); 1593 1594 return 0; 1595 } 1596 1597 static int ovs_dp_stats_init(struct datapath *dp) 1598 { 1599 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1600 if (!dp->stats_percpu) 1601 return -ENOMEM; 1602 1603 return 0; 1604 } 1605 1606 static int ovs_dp_vport_init(struct datapath *dp) 1607 { 1608 int i; 1609 1610 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS, 1611 sizeof(struct hlist_head), 1612 GFP_KERNEL); 1613 if (!dp->ports) 1614 return -ENOMEM; 1615 1616 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1617 INIT_HLIST_HEAD(&dp->ports[i]); 1618 1619 return 0; 1620 } 1621 1622 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1623 { 1624 struct nlattr **a = info->attrs; 1625 struct vport_parms parms; 1626 struct sk_buff *reply; 1627 struct datapath *dp; 1628 struct vport *vport; 1629 struct ovs_net *ovs_net; 1630 int err; 1631 1632 err = -EINVAL; 1633 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1634 goto err; 1635 1636 reply = ovs_dp_cmd_alloc_info(); 1637 if (!reply) 1638 return -ENOMEM; 1639 1640 err = -ENOMEM; 1641 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1642 if (dp == NULL) 1643 goto err_destroy_reply; 1644 1645 ovs_dp_set_net(dp, sock_net(skb->sk)); 1646 1647 /* Allocate table. */ 1648 err = ovs_flow_tbl_init(&dp->table); 1649 if (err) 1650 goto err_destroy_dp; 1651 1652 err = ovs_dp_stats_init(dp); 1653 if (err) 1654 goto err_destroy_table; 1655 1656 err = ovs_dp_vport_init(dp); 1657 if (err) 1658 goto err_destroy_stats; 1659 1660 err = ovs_meters_init(dp); 1661 if (err) 1662 goto err_destroy_ports; 1663 1664 /* Set up our datapath device. */ 1665 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1666 parms.type = OVS_VPORT_TYPE_INTERNAL; 1667 parms.options = NULL; 1668 parms.dp = dp; 1669 parms.port_no = OVSP_LOCAL; 1670 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1671 1672 err = ovs_dp_change(dp, a); 1673 if (err) 1674 goto err_destroy_meters; 1675 1676 /* So far only local changes have been made, now need the lock. */ 1677 ovs_lock(); 1678 1679 vport = new_vport(&parms); 1680 if (IS_ERR(vport)) { 1681 err = PTR_ERR(vport); 1682 if (err == -EBUSY) 1683 err = -EEXIST; 1684 1685 if (err == -EEXIST) { 1686 /* An outdated user space instance that does not understand 1687 * the concept of user_features has attempted to create a new 1688 * datapath and is likely to reuse it. Drop all user features. 1689 */ 1690 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1691 ovs_dp_reset_user_features(skb, info); 1692 } 1693 1694 ovs_unlock(); 1695 goto err_destroy_meters; 1696 } 1697 1698 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1699 info->snd_seq, 0, OVS_DP_CMD_NEW); 1700 BUG_ON(err < 0); 1701 1702 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1703 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1704 1705 ovs_unlock(); 1706 1707 ovs_notify(&dp_datapath_genl_family, reply, info); 1708 return 0; 1709 1710 err_destroy_meters: 1711 ovs_meters_exit(dp); 1712 err_destroy_ports: 1713 kfree(dp->ports); 1714 err_destroy_stats: 1715 free_percpu(dp->stats_percpu); 1716 err_destroy_table: 1717 ovs_flow_tbl_destroy(&dp->table); 1718 err_destroy_dp: 1719 kfree(dp); 1720 err_destroy_reply: 1721 kfree_skb(reply); 1722 err: 1723 return err; 1724 } 1725 1726 /* Called with ovs_mutex. */ 1727 static void __dp_destroy(struct datapath *dp) 1728 { 1729 int i; 1730 1731 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1732 struct vport *vport; 1733 struct hlist_node *n; 1734 1735 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1736 if (vport->port_no != OVSP_LOCAL) 1737 ovs_dp_detach_port(vport); 1738 } 1739 1740 list_del_rcu(&dp->list_node); 1741 1742 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1743 * all ports in datapath are destroyed first before freeing datapath. 1744 */ 1745 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1746 1747 /* RCU destroy the flow table */ 1748 call_rcu(&dp->rcu, destroy_dp_rcu); 1749 } 1750 1751 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1752 { 1753 struct sk_buff *reply; 1754 struct datapath *dp; 1755 int err; 1756 1757 reply = ovs_dp_cmd_alloc_info(); 1758 if (!reply) 1759 return -ENOMEM; 1760 1761 ovs_lock(); 1762 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1763 err = PTR_ERR(dp); 1764 if (IS_ERR(dp)) 1765 goto err_unlock_free; 1766 1767 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1768 info->snd_seq, 0, OVS_DP_CMD_DEL); 1769 BUG_ON(err < 0); 1770 1771 __dp_destroy(dp); 1772 ovs_unlock(); 1773 1774 ovs_notify(&dp_datapath_genl_family, reply, info); 1775 1776 return 0; 1777 1778 err_unlock_free: 1779 ovs_unlock(); 1780 kfree_skb(reply); 1781 return err; 1782 } 1783 1784 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1785 { 1786 struct sk_buff *reply; 1787 struct datapath *dp; 1788 int err; 1789 1790 reply = ovs_dp_cmd_alloc_info(); 1791 if (!reply) 1792 return -ENOMEM; 1793 1794 ovs_lock(); 1795 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1796 err = PTR_ERR(dp); 1797 if (IS_ERR(dp)) 1798 goto err_unlock_free; 1799 1800 err = ovs_dp_change(dp, info->attrs); 1801 if (err) 1802 goto err_unlock_free; 1803 1804 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1805 info->snd_seq, 0, OVS_DP_CMD_SET); 1806 BUG_ON(err < 0); 1807 1808 ovs_unlock(); 1809 ovs_notify(&dp_datapath_genl_family, reply, info); 1810 1811 return 0; 1812 1813 err_unlock_free: 1814 ovs_unlock(); 1815 kfree_skb(reply); 1816 return err; 1817 } 1818 1819 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1820 { 1821 struct sk_buff *reply; 1822 struct datapath *dp; 1823 int err; 1824 1825 reply = ovs_dp_cmd_alloc_info(); 1826 if (!reply) 1827 return -ENOMEM; 1828 1829 ovs_lock(); 1830 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1831 if (IS_ERR(dp)) { 1832 err = PTR_ERR(dp); 1833 goto err_unlock_free; 1834 } 1835 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1836 info->snd_seq, 0, OVS_DP_CMD_GET); 1837 BUG_ON(err < 0); 1838 ovs_unlock(); 1839 1840 return genlmsg_reply(reply, info); 1841 1842 err_unlock_free: 1843 ovs_unlock(); 1844 kfree_skb(reply); 1845 return err; 1846 } 1847 1848 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1849 { 1850 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1851 struct datapath *dp; 1852 int skip = cb->args[0]; 1853 int i = 0; 1854 1855 ovs_lock(); 1856 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1857 if (i >= skip && 1858 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1859 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1860 OVS_DP_CMD_GET) < 0) 1861 break; 1862 i++; 1863 } 1864 ovs_unlock(); 1865 1866 cb->args[0] = i; 1867 1868 return skb->len; 1869 } 1870 1871 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1872 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1873 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1874 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1875 }; 1876 1877 static const struct genl_ops dp_datapath_genl_ops[] = { 1878 { .cmd = OVS_DP_CMD_NEW, 1879 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1880 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1881 .doit = ovs_dp_cmd_new 1882 }, 1883 { .cmd = OVS_DP_CMD_DEL, 1884 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1885 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1886 .doit = ovs_dp_cmd_del 1887 }, 1888 { .cmd = OVS_DP_CMD_GET, 1889 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1890 .flags = 0, /* OK for unprivileged users. */ 1891 .doit = ovs_dp_cmd_get, 1892 .dumpit = ovs_dp_cmd_dump 1893 }, 1894 { .cmd = OVS_DP_CMD_SET, 1895 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1896 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1897 .doit = ovs_dp_cmd_set, 1898 }, 1899 }; 1900 1901 static struct genl_family dp_datapath_genl_family __ro_after_init = { 1902 .hdrsize = sizeof(struct ovs_header), 1903 .name = OVS_DATAPATH_FAMILY, 1904 .version = OVS_DATAPATH_VERSION, 1905 .maxattr = OVS_DP_ATTR_MAX, 1906 .policy = datapath_policy, 1907 .netnsok = true, 1908 .parallel_ops = true, 1909 .ops = dp_datapath_genl_ops, 1910 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops), 1911 .mcgrps = &ovs_dp_datapath_multicast_group, 1912 .n_mcgrps = 1, 1913 .module = THIS_MODULE, 1914 }; 1915 1916 /* Called with ovs_mutex or RCU read lock. */ 1917 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1918 struct net *net, u32 portid, u32 seq, 1919 u32 flags, u8 cmd, gfp_t gfp) 1920 { 1921 struct ovs_header *ovs_header; 1922 struct ovs_vport_stats vport_stats; 1923 int err; 1924 1925 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1926 flags, cmd); 1927 if (!ovs_header) 1928 return -EMSGSIZE; 1929 1930 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1931 1932 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1933 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1934 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 1935 ovs_vport_name(vport)) || 1936 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex)) 1937 goto nla_put_failure; 1938 1939 if (!net_eq(net, dev_net(vport->dev))) { 1940 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp); 1941 1942 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id)) 1943 goto nla_put_failure; 1944 } 1945 1946 ovs_vport_get_stats(vport, &vport_stats); 1947 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS, 1948 sizeof(struct ovs_vport_stats), &vport_stats, 1949 OVS_VPORT_ATTR_PAD)) 1950 goto nla_put_failure; 1951 1952 if (ovs_vport_get_upcall_portids(vport, skb)) 1953 goto nla_put_failure; 1954 1955 err = ovs_vport_get_options(vport, skb); 1956 if (err == -EMSGSIZE) 1957 goto error; 1958 1959 genlmsg_end(skb, ovs_header); 1960 return 0; 1961 1962 nla_put_failure: 1963 err = -EMSGSIZE; 1964 error: 1965 genlmsg_cancel(skb, ovs_header); 1966 return err; 1967 } 1968 1969 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 1970 { 1971 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1972 } 1973 1974 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 1975 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net, 1976 u32 portid, u32 seq, u8 cmd) 1977 { 1978 struct sk_buff *skb; 1979 int retval; 1980 1981 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1982 if (!skb) 1983 return ERR_PTR(-ENOMEM); 1984 1985 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd, 1986 GFP_KERNEL); 1987 BUG_ON(retval < 0); 1988 1989 return skb; 1990 } 1991 1992 /* Called with ovs_mutex or RCU read lock. */ 1993 static struct vport *lookup_vport(struct net *net, 1994 const struct ovs_header *ovs_header, 1995 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1996 { 1997 struct datapath *dp; 1998 struct vport *vport; 1999 2000 if (a[OVS_VPORT_ATTR_IFINDEX]) 2001 return ERR_PTR(-EOPNOTSUPP); 2002 if (a[OVS_VPORT_ATTR_NAME]) { 2003 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 2004 if (!vport) 2005 return ERR_PTR(-ENODEV); 2006 if (ovs_header->dp_ifindex && 2007 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 2008 return ERR_PTR(-ENODEV); 2009 return vport; 2010 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 2011 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 2012 2013 if (port_no >= DP_MAX_PORTS) 2014 return ERR_PTR(-EFBIG); 2015 2016 dp = get_dp(net, ovs_header->dp_ifindex); 2017 if (!dp) 2018 return ERR_PTR(-ENODEV); 2019 2020 vport = ovs_vport_ovsl_rcu(dp, port_no); 2021 if (!vport) 2022 return ERR_PTR(-ENODEV); 2023 return vport; 2024 } else 2025 return ERR_PTR(-EINVAL); 2026 2027 } 2028 2029 static unsigned int ovs_get_max_headroom(struct datapath *dp) 2030 { 2031 unsigned int dev_headroom, max_headroom = 0; 2032 struct net_device *dev; 2033 struct vport *vport; 2034 int i; 2035 2036 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2037 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2038 dev = vport->dev; 2039 dev_headroom = netdev_get_fwd_headroom(dev); 2040 if (dev_headroom > max_headroom) 2041 max_headroom = dev_headroom; 2042 } 2043 } 2044 2045 return max_headroom; 2046 } 2047 2048 /* Called with ovs_mutex */ 2049 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom) 2050 { 2051 struct vport *vport; 2052 int i; 2053 2054 dp->max_headroom = new_headroom; 2055 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 2056 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) 2057 netdev_set_rx_headroom(vport->dev, new_headroom); 2058 } 2059 2060 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 2061 { 2062 struct nlattr **a = info->attrs; 2063 struct ovs_header *ovs_header = info->userhdr; 2064 struct vport_parms parms; 2065 struct sk_buff *reply; 2066 struct vport *vport; 2067 struct datapath *dp; 2068 unsigned int new_headroom; 2069 u32 port_no; 2070 int err; 2071 2072 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 2073 !a[OVS_VPORT_ATTR_UPCALL_PID]) 2074 return -EINVAL; 2075 if (a[OVS_VPORT_ATTR_IFINDEX]) 2076 return -EOPNOTSUPP; 2077 2078 port_no = a[OVS_VPORT_ATTR_PORT_NO] 2079 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 2080 if (port_no >= DP_MAX_PORTS) 2081 return -EFBIG; 2082 2083 reply = ovs_vport_cmd_alloc_info(); 2084 if (!reply) 2085 return -ENOMEM; 2086 2087 ovs_lock(); 2088 restart: 2089 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 2090 err = -ENODEV; 2091 if (!dp) 2092 goto exit_unlock_free; 2093 2094 if (port_no) { 2095 vport = ovs_vport_ovsl(dp, port_no); 2096 err = -EBUSY; 2097 if (vport) 2098 goto exit_unlock_free; 2099 } else { 2100 for (port_no = 1; ; port_no++) { 2101 if (port_no >= DP_MAX_PORTS) { 2102 err = -EFBIG; 2103 goto exit_unlock_free; 2104 } 2105 vport = ovs_vport_ovsl(dp, port_no); 2106 if (!vport) 2107 break; 2108 } 2109 } 2110 2111 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 2112 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 2113 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 2114 parms.dp = dp; 2115 parms.port_no = port_no; 2116 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2117 2118 vport = new_vport(&parms); 2119 err = PTR_ERR(vport); 2120 if (IS_ERR(vport)) { 2121 if (err == -EAGAIN) 2122 goto restart; 2123 goto exit_unlock_free; 2124 } 2125 2126 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2127 info->snd_portid, info->snd_seq, 0, 2128 OVS_VPORT_CMD_NEW, GFP_KERNEL); 2129 2130 new_headroom = netdev_get_fwd_headroom(vport->dev); 2131 2132 if (new_headroom > dp->max_headroom) 2133 ovs_update_headroom(dp, new_headroom); 2134 else 2135 netdev_set_rx_headroom(vport->dev, dp->max_headroom); 2136 2137 BUG_ON(err < 0); 2138 ovs_unlock(); 2139 2140 ovs_notify(&dp_vport_genl_family, reply, info); 2141 return 0; 2142 2143 exit_unlock_free: 2144 ovs_unlock(); 2145 kfree_skb(reply); 2146 return err; 2147 } 2148 2149 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 2150 { 2151 struct nlattr **a = info->attrs; 2152 struct sk_buff *reply; 2153 struct vport *vport; 2154 int err; 2155 2156 reply = ovs_vport_cmd_alloc_info(); 2157 if (!reply) 2158 return -ENOMEM; 2159 2160 ovs_lock(); 2161 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2162 err = PTR_ERR(vport); 2163 if (IS_ERR(vport)) 2164 goto exit_unlock_free; 2165 2166 if (a[OVS_VPORT_ATTR_TYPE] && 2167 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 2168 err = -EINVAL; 2169 goto exit_unlock_free; 2170 } 2171 2172 if (a[OVS_VPORT_ATTR_OPTIONS]) { 2173 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 2174 if (err) 2175 goto exit_unlock_free; 2176 } 2177 2178 2179 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 2180 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2181 2182 err = ovs_vport_set_upcall_portids(vport, ids); 2183 if (err) 2184 goto exit_unlock_free; 2185 } 2186 2187 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2188 info->snd_portid, info->snd_seq, 0, 2189 OVS_VPORT_CMD_SET, GFP_KERNEL); 2190 BUG_ON(err < 0); 2191 2192 ovs_unlock(); 2193 ovs_notify(&dp_vport_genl_family, reply, info); 2194 return 0; 2195 2196 exit_unlock_free: 2197 ovs_unlock(); 2198 kfree_skb(reply); 2199 return err; 2200 } 2201 2202 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2203 { 2204 bool update_headroom = false; 2205 struct nlattr **a = info->attrs; 2206 struct sk_buff *reply; 2207 struct datapath *dp; 2208 struct vport *vport; 2209 unsigned int new_headroom; 2210 int err; 2211 2212 reply = ovs_vport_cmd_alloc_info(); 2213 if (!reply) 2214 return -ENOMEM; 2215 2216 ovs_lock(); 2217 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2218 err = PTR_ERR(vport); 2219 if (IS_ERR(vport)) 2220 goto exit_unlock_free; 2221 2222 if (vport->port_no == OVSP_LOCAL) { 2223 err = -EINVAL; 2224 goto exit_unlock_free; 2225 } 2226 2227 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2228 info->snd_portid, info->snd_seq, 0, 2229 OVS_VPORT_CMD_DEL, GFP_KERNEL); 2230 BUG_ON(err < 0); 2231 2232 /* the vport deletion may trigger dp headroom update */ 2233 dp = vport->dp; 2234 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom) 2235 update_headroom = true; 2236 2237 netdev_reset_rx_headroom(vport->dev); 2238 ovs_dp_detach_port(vport); 2239 2240 if (update_headroom) { 2241 new_headroom = ovs_get_max_headroom(dp); 2242 2243 if (new_headroom < dp->max_headroom) 2244 ovs_update_headroom(dp, new_headroom); 2245 } 2246 ovs_unlock(); 2247 2248 ovs_notify(&dp_vport_genl_family, reply, info); 2249 return 0; 2250 2251 exit_unlock_free: 2252 ovs_unlock(); 2253 kfree_skb(reply); 2254 return err; 2255 } 2256 2257 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2258 { 2259 struct nlattr **a = info->attrs; 2260 struct ovs_header *ovs_header = info->userhdr; 2261 struct sk_buff *reply; 2262 struct vport *vport; 2263 int err; 2264 2265 reply = ovs_vport_cmd_alloc_info(); 2266 if (!reply) 2267 return -ENOMEM; 2268 2269 rcu_read_lock(); 2270 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2271 err = PTR_ERR(vport); 2272 if (IS_ERR(vport)) 2273 goto exit_unlock_free; 2274 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2275 info->snd_portid, info->snd_seq, 0, 2276 OVS_VPORT_CMD_GET, GFP_ATOMIC); 2277 BUG_ON(err < 0); 2278 rcu_read_unlock(); 2279 2280 return genlmsg_reply(reply, info); 2281 2282 exit_unlock_free: 2283 rcu_read_unlock(); 2284 kfree_skb(reply); 2285 return err; 2286 } 2287 2288 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2289 { 2290 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2291 struct datapath *dp; 2292 int bucket = cb->args[0], skip = cb->args[1]; 2293 int i, j = 0; 2294 2295 rcu_read_lock(); 2296 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2297 if (!dp) { 2298 rcu_read_unlock(); 2299 return -ENODEV; 2300 } 2301 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2302 struct vport *vport; 2303 2304 j = 0; 2305 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2306 if (j >= skip && 2307 ovs_vport_cmd_fill_info(vport, skb, 2308 sock_net(skb->sk), 2309 NETLINK_CB(cb->skb).portid, 2310 cb->nlh->nlmsg_seq, 2311 NLM_F_MULTI, 2312 OVS_VPORT_CMD_GET, 2313 GFP_ATOMIC) < 0) 2314 goto out; 2315 2316 j++; 2317 } 2318 skip = 0; 2319 } 2320 out: 2321 rcu_read_unlock(); 2322 2323 cb->args[0] = i; 2324 cb->args[1] = j; 2325 2326 return skb->len; 2327 } 2328 2329 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2330 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2331 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2332 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2333 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2334 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC }, 2335 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2336 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 }, 2337 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 }, 2338 }; 2339 2340 static const struct genl_ops dp_vport_genl_ops[] = { 2341 { .cmd = OVS_VPORT_CMD_NEW, 2342 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2343 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2344 .doit = ovs_vport_cmd_new 2345 }, 2346 { .cmd = OVS_VPORT_CMD_DEL, 2347 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2348 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2349 .doit = ovs_vport_cmd_del 2350 }, 2351 { .cmd = OVS_VPORT_CMD_GET, 2352 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2353 .flags = 0, /* OK for unprivileged users. */ 2354 .doit = ovs_vport_cmd_get, 2355 .dumpit = ovs_vport_cmd_dump 2356 }, 2357 { .cmd = OVS_VPORT_CMD_SET, 2358 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2359 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2360 .doit = ovs_vport_cmd_set, 2361 }, 2362 }; 2363 2364 struct genl_family dp_vport_genl_family __ro_after_init = { 2365 .hdrsize = sizeof(struct ovs_header), 2366 .name = OVS_VPORT_FAMILY, 2367 .version = OVS_VPORT_VERSION, 2368 .maxattr = OVS_VPORT_ATTR_MAX, 2369 .policy = vport_policy, 2370 .netnsok = true, 2371 .parallel_ops = true, 2372 .ops = dp_vport_genl_ops, 2373 .n_ops = ARRAY_SIZE(dp_vport_genl_ops), 2374 .mcgrps = &ovs_dp_vport_multicast_group, 2375 .n_mcgrps = 1, 2376 .module = THIS_MODULE, 2377 }; 2378 2379 static struct genl_family * const dp_genl_families[] = { 2380 &dp_datapath_genl_family, 2381 &dp_vport_genl_family, 2382 &dp_flow_genl_family, 2383 &dp_packet_genl_family, 2384 &dp_meter_genl_family, 2385 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 2386 &dp_ct_limit_genl_family, 2387 #endif 2388 }; 2389 2390 static void dp_unregister_genl(int n_families) 2391 { 2392 int i; 2393 2394 for (i = 0; i < n_families; i++) 2395 genl_unregister_family(dp_genl_families[i]); 2396 } 2397 2398 static int __init dp_register_genl(void) 2399 { 2400 int err; 2401 int i; 2402 2403 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2404 2405 err = genl_register_family(dp_genl_families[i]); 2406 if (err) 2407 goto error; 2408 } 2409 2410 return 0; 2411 2412 error: 2413 dp_unregister_genl(i); 2414 return err; 2415 } 2416 2417 static int __net_init ovs_init_net(struct net *net) 2418 { 2419 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2420 2421 INIT_LIST_HEAD(&ovs_net->dps); 2422 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2423 return ovs_ct_init(net); 2424 } 2425 2426 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2427 struct list_head *head) 2428 { 2429 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2430 struct datapath *dp; 2431 2432 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2433 int i; 2434 2435 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2436 struct vport *vport; 2437 2438 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2439 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2440 continue; 2441 2442 if (dev_net(vport->dev) == dnet) 2443 list_add(&vport->detach_list, head); 2444 } 2445 } 2446 } 2447 } 2448 2449 static void __net_exit ovs_exit_net(struct net *dnet) 2450 { 2451 struct datapath *dp, *dp_next; 2452 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2453 struct vport *vport, *vport_next; 2454 struct net *net; 2455 LIST_HEAD(head); 2456 2457 ovs_ct_exit(dnet); 2458 ovs_lock(); 2459 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2460 __dp_destroy(dp); 2461 2462 down_read(&net_rwsem); 2463 for_each_net(net) 2464 list_vports_from_net(net, dnet, &head); 2465 up_read(&net_rwsem); 2466 2467 /* Detach all vports from given namespace. */ 2468 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2469 list_del(&vport->detach_list); 2470 ovs_dp_detach_port(vport); 2471 } 2472 2473 ovs_unlock(); 2474 2475 cancel_work_sync(&ovs_net->dp_notify_work); 2476 } 2477 2478 static struct pernet_operations ovs_net_ops = { 2479 .init = ovs_init_net, 2480 .exit = ovs_exit_net, 2481 .id = &ovs_net_id, 2482 .size = sizeof(struct ovs_net), 2483 }; 2484 2485 static int __init dp_init(void) 2486 { 2487 int err; 2488 2489 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); 2490 2491 pr_info("Open vSwitch switching datapath\n"); 2492 2493 err = action_fifos_init(); 2494 if (err) 2495 goto error; 2496 2497 err = ovs_internal_dev_rtnl_link_register(); 2498 if (err) 2499 goto error_action_fifos_exit; 2500 2501 err = ovs_flow_init(); 2502 if (err) 2503 goto error_unreg_rtnl_link; 2504 2505 err = ovs_vport_init(); 2506 if (err) 2507 goto error_flow_exit; 2508 2509 err = register_pernet_device(&ovs_net_ops); 2510 if (err) 2511 goto error_vport_exit; 2512 2513 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2514 if (err) 2515 goto error_netns_exit; 2516 2517 err = ovs_netdev_init(); 2518 if (err) 2519 goto error_unreg_notifier; 2520 2521 err = dp_register_genl(); 2522 if (err < 0) 2523 goto error_unreg_netdev; 2524 2525 return 0; 2526 2527 error_unreg_netdev: 2528 ovs_netdev_exit(); 2529 error_unreg_notifier: 2530 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2531 error_netns_exit: 2532 unregister_pernet_device(&ovs_net_ops); 2533 error_vport_exit: 2534 ovs_vport_exit(); 2535 error_flow_exit: 2536 ovs_flow_exit(); 2537 error_unreg_rtnl_link: 2538 ovs_internal_dev_rtnl_link_unregister(); 2539 error_action_fifos_exit: 2540 action_fifos_exit(); 2541 error: 2542 return err; 2543 } 2544 2545 static void dp_cleanup(void) 2546 { 2547 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2548 ovs_netdev_exit(); 2549 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2550 unregister_pernet_device(&ovs_net_ops); 2551 rcu_barrier(); 2552 ovs_vport_exit(); 2553 ovs_flow_exit(); 2554 ovs_internal_dev_rtnl_link_unregister(); 2555 action_fifos_exit(); 2556 } 2557 2558 module_init(dp_init); 2559 module_exit(dp_cleanup); 2560 2561 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2562 MODULE_LICENSE("GPL"); 2563 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY); 2564 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY); 2565 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY); 2566 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY); 2567 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY); 2568 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY); 2569