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