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