1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2007-2014 Nicira, Inc. 4 */ 5 6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7 8 #include <linux/init.h> 9 #include <linux/module.h> 10 #include <linux/if_arp.h> 11 #include <linux/if_vlan.h> 12 #include <linux/in.h> 13 #include <linux/ip.h> 14 #include <linux/jhash.h> 15 #include <linux/delay.h> 16 #include <linux/time.h> 17 #include <linux/etherdevice.h> 18 #include <linux/genetlink.h> 19 #include <linux/kernel.h> 20 #include <linux/kthread.h> 21 #include <linux/mutex.h> 22 #include <linux/percpu.h> 23 #include <linux/rcupdate.h> 24 #include <linux/tcp.h> 25 #include <linux/udp.h> 26 #include <linux/ethtool.h> 27 #include <linux/wait.h> 28 #include <asm/div64.h> 29 #include <linux/highmem.h> 30 #include <linux/netfilter_bridge.h> 31 #include <linux/netfilter_ipv4.h> 32 #include <linux/inetdevice.h> 33 #include <linux/list.h> 34 #include <linux/openvswitch.h> 35 #include <linux/rculist.h> 36 #include <linux/dmi.h> 37 #include <net/genetlink.h> 38 #include <net/net_namespace.h> 39 #include <net/netns/generic.h> 40 41 #include "datapath.h" 42 #include "flow.h" 43 #include "flow_table.h" 44 #include "flow_netlink.h" 45 #include "meter.h" 46 #include "vport-internal_dev.h" 47 #include "vport-netdev.h" 48 49 unsigned int ovs_net_id __read_mostly; 50 51 static struct genl_family dp_packet_genl_family; 52 static struct genl_family dp_flow_genl_family; 53 static struct genl_family dp_datapath_genl_family; 54 55 static const struct nla_policy flow_policy[]; 56 57 static const struct genl_multicast_group ovs_dp_flow_multicast_group = { 58 .name = OVS_FLOW_MCGROUP, 59 }; 60 61 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = { 62 .name = OVS_DATAPATH_MCGROUP, 63 }; 64 65 static const struct genl_multicast_group ovs_dp_vport_multicast_group = { 66 .name = OVS_VPORT_MCGROUP, 67 }; 68 69 /* Check if need to build a reply message. 70 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */ 71 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info, 72 unsigned int group) 73 { 74 return info->nlhdr->nlmsg_flags & NLM_F_ECHO || 75 genl_has_listeners(family, genl_info_net(info), group); 76 } 77 78 static void ovs_notify(struct genl_family *family, 79 struct sk_buff *skb, struct genl_info *info) 80 { 81 genl_notify(family, skb, info, 0, GFP_KERNEL); 82 } 83 84 /** 85 * DOC: Locking: 86 * 87 * All writes e.g. Writes to device state (add/remove datapath, port, set 88 * operations on vports, etc.), Writes to other state (flow table 89 * modifications, set miscellaneous datapath parameters, etc.) are protected 90 * by ovs_lock. 91 * 92 * Reads are protected by RCU. 93 * 94 * There are a few special cases (mostly stats) that have their own 95 * synchronization but they nest under all of above and don't interact with 96 * each other. 97 * 98 * The RTNL lock nests inside ovs_mutex. 99 */ 100 101 static DEFINE_MUTEX(ovs_mutex); 102 103 void ovs_lock(void) 104 { 105 mutex_lock(&ovs_mutex); 106 } 107 108 void ovs_unlock(void) 109 { 110 mutex_unlock(&ovs_mutex); 111 } 112 113 #ifdef CONFIG_LOCKDEP 114 int lockdep_ovsl_is_held(void) 115 { 116 if (debug_locks) 117 return lockdep_is_held(&ovs_mutex); 118 else 119 return 1; 120 } 121 #endif 122 123 static struct vport *new_vport(const struct vport_parms *); 124 static int queue_gso_packets(struct datapath *dp, struct sk_buff *, 125 const struct sw_flow_key *, 126 const struct dp_upcall_info *, 127 uint32_t cutlen); 128 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *, 129 const struct sw_flow_key *, 130 const struct dp_upcall_info *, 131 uint32_t cutlen); 132 133 /* Must be called with rcu_read_lock or ovs_mutex. */ 134 const char *ovs_dp_name(const struct datapath *dp) 135 { 136 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); 137 return ovs_vport_name(vport); 138 } 139 140 static int get_dpifindex(const struct datapath *dp) 141 { 142 struct vport *local; 143 int ifindex; 144 145 rcu_read_lock(); 146 147 local = ovs_vport_rcu(dp, OVSP_LOCAL); 148 if (local) 149 ifindex = local->dev->ifindex; 150 else 151 ifindex = 0; 152 153 rcu_read_unlock(); 154 155 return ifindex; 156 } 157 158 static void destroy_dp_rcu(struct rcu_head *rcu) 159 { 160 struct datapath *dp = container_of(rcu, struct datapath, rcu); 161 162 ovs_flow_tbl_destroy(&dp->table); 163 free_percpu(dp->stats_percpu); 164 kfree(dp->ports); 165 ovs_meters_exit(dp); 166 kfree(dp); 167 } 168 169 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 170 u16 port_no) 171 { 172 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 173 } 174 175 /* Called with ovs_mutex or RCU read lock. */ 176 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 177 { 178 struct vport *vport; 179 struct hlist_head *head; 180 181 head = vport_hash_bucket(dp, port_no); 182 hlist_for_each_entry_rcu(vport, head, dp_hash_node) { 183 if (vport->port_no == port_no) 184 return vport; 185 } 186 return NULL; 187 } 188 189 /* Called with ovs_mutex. */ 190 static struct vport *new_vport(const struct vport_parms *parms) 191 { 192 struct vport *vport; 193 194 vport = ovs_vport_add(parms); 195 if (!IS_ERR(vport)) { 196 struct datapath *dp = parms->dp; 197 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 198 199 hlist_add_head_rcu(&vport->dp_hash_node, head); 200 } 201 return vport; 202 } 203 204 void ovs_dp_detach_port(struct vport *p) 205 { 206 ASSERT_OVSL(); 207 208 /* First drop references to device. */ 209 hlist_del_rcu(&p->dp_hash_node); 210 211 /* Then destroy it. */ 212 ovs_vport_del(p); 213 } 214 215 /* Must be called with rcu_read_lock. */ 216 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key) 217 { 218 const struct vport *p = OVS_CB(skb)->input_vport; 219 struct datapath *dp = p->dp; 220 struct sw_flow *flow; 221 struct sw_flow_actions *sf_acts; 222 struct dp_stats_percpu *stats; 223 u64 *stats_counter; 224 u32 n_mask_hit; 225 int error; 226 227 stats = this_cpu_ptr(dp->stats_percpu); 228 229 /* Look up flow. */ 230 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb), 231 &n_mask_hit); 232 if (unlikely(!flow)) { 233 struct dp_upcall_info upcall; 234 235 memset(&upcall, 0, sizeof(upcall)); 236 upcall.cmd = OVS_PACKET_CMD_MISS; 237 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 238 upcall.mru = OVS_CB(skb)->mru; 239 error = ovs_dp_upcall(dp, skb, key, &upcall, 0); 240 if (unlikely(error)) 241 kfree_skb(skb); 242 else 243 consume_skb(skb); 244 stats_counter = &stats->n_missed; 245 goto out; 246 } 247 248 ovs_flow_stats_update(flow, key->tp.flags, skb); 249 sf_acts = rcu_dereference(flow->sf_acts); 250 error = ovs_execute_actions(dp, skb, sf_acts, key); 251 if (unlikely(error)) 252 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n", 253 ovs_dp_name(dp), error); 254 255 stats_counter = &stats->n_hit; 256 257 out: 258 /* Update datapath statistics. */ 259 u64_stats_update_begin(&stats->syncp); 260 (*stats_counter)++; 261 stats->n_mask_hit += n_mask_hit; 262 u64_stats_update_end(&stats->syncp); 263 } 264 265 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 266 const struct sw_flow_key *key, 267 const struct dp_upcall_info *upcall_info, 268 uint32_t cutlen) 269 { 270 struct dp_stats_percpu *stats; 271 int err; 272 273 if (upcall_info->portid == 0) { 274 err = -ENOTCONN; 275 goto err; 276 } 277 278 if (!skb_is_gso(skb)) 279 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 280 else 281 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen); 282 if (err) 283 goto err; 284 285 return 0; 286 287 err: 288 stats = this_cpu_ptr(dp->stats_percpu); 289 290 u64_stats_update_begin(&stats->syncp); 291 stats->n_lost++; 292 u64_stats_update_end(&stats->syncp); 293 294 return err; 295 } 296 297 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 298 const struct sw_flow_key *key, 299 const struct dp_upcall_info *upcall_info, 300 uint32_t cutlen) 301 { 302 unsigned int gso_type = skb_shinfo(skb)->gso_type; 303 struct sw_flow_key later_key; 304 struct sk_buff *segs, *nskb; 305 int err; 306 307 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET); 308 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 309 if (IS_ERR(segs)) 310 return PTR_ERR(segs); 311 if (segs == NULL) 312 return -EINVAL; 313 314 if (gso_type & SKB_GSO_UDP) { 315 /* The initial flow key extracted by ovs_flow_key_extract() 316 * in this case is for a first fragment, so we need to 317 * properly mark later fragments. 318 */ 319 later_key = *key; 320 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 321 } 322 323 /* Queue all of the segments. */ 324 skb = segs; 325 do { 326 if (gso_type & SKB_GSO_UDP && skb != segs) 327 key = &later_key; 328 329 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 330 if (err) 331 break; 332 333 } while ((skb = skb->next)); 334 335 /* Free all of the segments. */ 336 skb = segs; 337 do { 338 nskb = skb->next; 339 if (err) 340 kfree_skb(skb); 341 else 342 consume_skb(skb); 343 } while ((skb = nskb)); 344 return err; 345 } 346 347 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, 348 unsigned int hdrlen, int actions_attrlen) 349 { 350 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 351 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 352 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */ 353 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */ 354 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */ 355 356 /* OVS_PACKET_ATTR_USERDATA */ 357 if (upcall_info->userdata) 358 size += NLA_ALIGN(upcall_info->userdata->nla_len); 359 360 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ 361 if (upcall_info->egress_tun_info) 362 size += nla_total_size(ovs_tun_key_attr_size()); 363 364 /* OVS_PACKET_ATTR_ACTIONS */ 365 if (upcall_info->actions_len) 366 size += nla_total_size(actions_attrlen); 367 368 /* OVS_PACKET_ATTR_MRU */ 369 if (upcall_info->mru) 370 size += nla_total_size(sizeof(upcall_info->mru)); 371 372 return size; 373 } 374 375 static void pad_packet(struct datapath *dp, struct sk_buff *skb) 376 { 377 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 378 size_t plen = NLA_ALIGN(skb->len) - skb->len; 379 380 if (plen > 0) 381 skb_put_zero(skb, plen); 382 } 383 } 384 385 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 386 const struct sw_flow_key *key, 387 const struct dp_upcall_info *upcall_info, 388 uint32_t cutlen) 389 { 390 struct ovs_header *upcall; 391 struct sk_buff *nskb = NULL; 392 struct sk_buff *user_skb = NULL; /* to be queued to userspace */ 393 struct nlattr *nla; 394 size_t len; 395 unsigned int hlen; 396 int err, dp_ifindex; 397 u64 hash; 398 399 dp_ifindex = get_dpifindex(dp); 400 if (!dp_ifindex) 401 return -ENODEV; 402 403 if (skb_vlan_tag_present(skb)) { 404 nskb = skb_clone(skb, GFP_ATOMIC); 405 if (!nskb) 406 return -ENOMEM; 407 408 nskb = __vlan_hwaccel_push_inside(nskb); 409 if (!nskb) 410 return -ENOMEM; 411 412 skb = nskb; 413 } 414 415 if (nla_attr_size(skb->len) > USHRT_MAX) { 416 err = -EFBIG; 417 goto out; 418 } 419 420 /* Complete checksum if needed */ 421 if (skb->ip_summed == CHECKSUM_PARTIAL && 422 (err = skb_csum_hwoffload_help(skb, 0))) 423 goto out; 424 425 /* Older versions of OVS user space enforce alignment of the last 426 * Netlink attribute to NLA_ALIGNTO which would require extensive 427 * padding logic. Only perform zerocopy if padding is not required. 428 */ 429 if (dp->user_features & OVS_DP_F_UNALIGNED) 430 hlen = skb_zerocopy_headlen(skb); 431 else 432 hlen = skb->len; 433 434 len = upcall_msg_size(upcall_info, hlen - cutlen, 435 OVS_CB(skb)->acts_origlen); 436 user_skb = genlmsg_new(len, GFP_ATOMIC); 437 if (!user_skb) { 438 err = -ENOMEM; 439 goto out; 440 } 441 442 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 443 0, upcall_info->cmd); 444 if (!upcall) { 445 err = -EINVAL; 446 goto out; 447 } 448 upcall->dp_ifindex = dp_ifindex; 449 450 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); 451 if (err) 452 goto out; 453 454 if (upcall_info->userdata) 455 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 456 nla_len(upcall_info->userdata), 457 nla_data(upcall_info->userdata)); 458 459 if (upcall_info->egress_tun_info) { 460 nla = nla_nest_start_noflag(user_skb, 461 OVS_PACKET_ATTR_EGRESS_TUN_KEY); 462 if (!nla) { 463 err = -EMSGSIZE; 464 goto out; 465 } 466 err = ovs_nla_put_tunnel_info(user_skb, 467 upcall_info->egress_tun_info); 468 if (err) 469 goto out; 470 471 nla_nest_end(user_skb, nla); 472 } 473 474 if (upcall_info->actions_len) { 475 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS); 476 if (!nla) { 477 err = -EMSGSIZE; 478 goto out; 479 } 480 err = ovs_nla_put_actions(upcall_info->actions, 481 upcall_info->actions_len, 482 user_skb); 483 if (!err) 484 nla_nest_end(user_skb, nla); 485 else 486 nla_nest_cancel(user_skb, nla); 487 } 488 489 /* Add OVS_PACKET_ATTR_MRU */ 490 if (upcall_info->mru && 491 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) { 492 err = -ENOBUFS; 493 goto out; 494 } 495 496 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */ 497 if (cutlen > 0 && 498 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) { 499 err = -ENOBUFS; 500 goto out; 501 } 502 503 /* Add OVS_PACKET_ATTR_HASH */ 504 hash = skb_get_hash_raw(skb); 505 if (skb->sw_hash) 506 hash |= OVS_PACKET_HASH_SW_BIT; 507 508 if (skb->l4_hash) 509 hash |= OVS_PACKET_HASH_L4_BIT; 510 511 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) { 512 err = -ENOBUFS; 513 goto out; 514 } 515 516 /* Only reserve room for attribute header, packet data is added 517 * in skb_zerocopy() */ 518 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 519 err = -ENOBUFS; 520 goto out; 521 } 522 nla->nla_len = nla_attr_size(skb->len - cutlen); 523 524 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen); 525 if (err) 526 goto out; 527 528 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 529 pad_packet(dp, user_skb); 530 531 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 532 533 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 534 user_skb = NULL; 535 out: 536 if (err) 537 skb_tx_error(skb); 538 kfree_skb(user_skb); 539 kfree_skb(nskb); 540 return err; 541 } 542 543 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 544 { 545 struct ovs_header *ovs_header = info->userhdr; 546 struct net *net = sock_net(skb->sk); 547 struct nlattr **a = info->attrs; 548 struct sw_flow_actions *acts; 549 struct sk_buff *packet; 550 struct sw_flow *flow; 551 struct sw_flow_actions *sf_acts; 552 struct datapath *dp; 553 struct vport *input_vport; 554 u16 mru = 0; 555 u64 hash; 556 int len; 557 int err; 558 bool log = !a[OVS_PACKET_ATTR_PROBE]; 559 560 err = -EINVAL; 561 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 562 !a[OVS_PACKET_ATTR_ACTIONS]) 563 goto err; 564 565 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 566 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 567 err = -ENOMEM; 568 if (!packet) 569 goto err; 570 skb_reserve(packet, NET_IP_ALIGN); 571 572 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 573 574 /* Set packet's mru */ 575 if (a[OVS_PACKET_ATTR_MRU]) { 576 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]); 577 packet->ignore_df = 1; 578 } 579 OVS_CB(packet)->mru = mru; 580 581 if (a[OVS_PACKET_ATTR_HASH]) { 582 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]); 583 584 __skb_set_hash(packet, hash & 0xFFFFFFFFULL, 585 !!(hash & OVS_PACKET_HASH_SW_BIT), 586 !!(hash & OVS_PACKET_HASH_L4_BIT)); 587 } 588 589 /* Build an sw_flow for sending this packet. */ 590 flow = ovs_flow_alloc(); 591 err = PTR_ERR(flow); 592 if (IS_ERR(flow)) 593 goto err_kfree_skb; 594 595 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY], 596 packet, &flow->key, log); 597 if (err) 598 goto err_flow_free; 599 600 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS], 601 &flow->key, &acts, log); 602 if (err) 603 goto err_flow_free; 604 605 rcu_assign_pointer(flow->sf_acts, acts); 606 packet->priority = flow->key.phy.priority; 607 packet->mark = flow->key.phy.skb_mark; 608 609 rcu_read_lock(); 610 dp = get_dp_rcu(net, ovs_header->dp_ifindex); 611 err = -ENODEV; 612 if (!dp) 613 goto err_unlock; 614 615 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 616 if (!input_vport) 617 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 618 619 if (!input_vport) 620 goto err_unlock; 621 622 packet->dev = input_vport->dev; 623 OVS_CB(packet)->input_vport = input_vport; 624 sf_acts = rcu_dereference(flow->sf_acts); 625 626 local_bh_disable(); 627 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); 628 local_bh_enable(); 629 rcu_read_unlock(); 630 631 ovs_flow_free(flow, false); 632 return err; 633 634 err_unlock: 635 rcu_read_unlock(); 636 err_flow_free: 637 ovs_flow_free(flow, false); 638 err_kfree_skb: 639 kfree_skb(packet); 640 err: 641 return err; 642 } 643 644 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 645 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 646 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 647 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 648 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, 649 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, 650 }; 651 652 static const struct genl_ops dp_packet_genl_ops[] = { 653 { .cmd = OVS_PACKET_CMD_EXECUTE, 654 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 655 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 656 .doit = ovs_packet_cmd_execute 657 } 658 }; 659 660 static struct genl_family dp_packet_genl_family __ro_after_init = { 661 .hdrsize = sizeof(struct ovs_header), 662 .name = OVS_PACKET_FAMILY, 663 .version = OVS_PACKET_VERSION, 664 .maxattr = OVS_PACKET_ATTR_MAX, 665 .policy = packet_policy, 666 .netnsok = true, 667 .parallel_ops = true, 668 .ops = dp_packet_genl_ops, 669 .n_ops = ARRAY_SIZE(dp_packet_genl_ops), 670 .module = THIS_MODULE, 671 }; 672 673 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 674 struct ovs_dp_megaflow_stats *mega_stats) 675 { 676 int i; 677 678 memset(mega_stats, 0, sizeof(*mega_stats)); 679 680 stats->n_flows = ovs_flow_tbl_count(&dp->table); 681 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 682 683 stats->n_hit = stats->n_missed = stats->n_lost = 0; 684 685 for_each_possible_cpu(i) { 686 const struct dp_stats_percpu *percpu_stats; 687 struct dp_stats_percpu local_stats; 688 unsigned int start; 689 690 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 691 692 do { 693 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 694 local_stats = *percpu_stats; 695 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 696 697 stats->n_hit += local_stats.n_hit; 698 stats->n_missed += local_stats.n_missed; 699 stats->n_lost += local_stats.n_lost; 700 mega_stats->n_mask_hit += local_stats.n_mask_hit; 701 } 702 } 703 704 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) 705 { 706 return ovs_identifier_is_ufid(sfid) && 707 !(ufid_flags & OVS_UFID_F_OMIT_KEY); 708 } 709 710 static bool should_fill_mask(uint32_t ufid_flags) 711 { 712 return !(ufid_flags & OVS_UFID_F_OMIT_MASK); 713 } 714 715 static bool should_fill_actions(uint32_t ufid_flags) 716 { 717 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); 718 } 719 720 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, 721 const struct sw_flow_id *sfid, 722 uint32_t ufid_flags) 723 { 724 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); 725 726 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback 727 * see ovs_nla_put_identifier() 728 */ 729 if (sfid && ovs_identifier_is_ufid(sfid)) 730 len += nla_total_size(sfid->ufid_len); 731 else 732 len += nla_total_size(ovs_key_attr_size()); 733 734 /* OVS_FLOW_ATTR_KEY */ 735 if (!sfid || should_fill_key(sfid, ufid_flags)) 736 len += nla_total_size(ovs_key_attr_size()); 737 738 /* OVS_FLOW_ATTR_MASK */ 739 if (should_fill_mask(ufid_flags)) 740 len += nla_total_size(ovs_key_attr_size()); 741 742 /* OVS_FLOW_ATTR_ACTIONS */ 743 if (should_fill_actions(ufid_flags)) 744 len += nla_total_size(acts->orig_len); 745 746 return len 747 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 748 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 749 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */ 750 } 751 752 /* Called with ovs_mutex or RCU read lock. */ 753 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 754 struct sk_buff *skb) 755 { 756 struct ovs_flow_stats stats; 757 __be16 tcp_flags; 758 unsigned long used; 759 760 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 761 762 if (used && 763 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used), 764 OVS_FLOW_ATTR_PAD)) 765 return -EMSGSIZE; 766 767 if (stats.n_packets && 768 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS, 769 sizeof(struct ovs_flow_stats), &stats, 770 OVS_FLOW_ATTR_PAD)) 771 return -EMSGSIZE; 772 773 if ((u8)ntohs(tcp_flags) && 774 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 775 return -EMSGSIZE; 776 777 return 0; 778 } 779 780 /* Called with ovs_mutex or RCU read lock. */ 781 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 782 struct sk_buff *skb, int skb_orig_len) 783 { 784 struct nlattr *start; 785 int err; 786 787 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 788 * this is the first flow to be dumped into 'skb'. This is unusual for 789 * Netlink but individual action lists can be longer than 790 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 791 * The userspace caller can always fetch the actions separately if it 792 * really wants them. (Most userspace callers in fact don't care.) 793 * 794 * This can only fail for dump operations because the skb is always 795 * properly sized for single flows. 796 */ 797 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS); 798 if (start) { 799 const struct sw_flow_actions *sf_acts; 800 801 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 802 err = ovs_nla_put_actions(sf_acts->actions, 803 sf_acts->actions_len, skb); 804 805 if (!err) 806 nla_nest_end(skb, start); 807 else { 808 if (skb_orig_len) 809 return err; 810 811 nla_nest_cancel(skb, start); 812 } 813 } else if (skb_orig_len) { 814 return -EMSGSIZE; 815 } 816 817 return 0; 818 } 819 820 /* Called with ovs_mutex or RCU read lock. */ 821 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 822 struct sk_buff *skb, u32 portid, 823 u32 seq, u32 flags, u8 cmd, u32 ufid_flags) 824 { 825 const int skb_orig_len = skb->len; 826 struct ovs_header *ovs_header; 827 int err; 828 829 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 830 flags, cmd); 831 if (!ovs_header) 832 return -EMSGSIZE; 833 834 ovs_header->dp_ifindex = dp_ifindex; 835 836 err = ovs_nla_put_identifier(flow, skb); 837 if (err) 838 goto error; 839 840 if (should_fill_key(&flow->id, ufid_flags)) { 841 err = ovs_nla_put_masked_key(flow, skb); 842 if (err) 843 goto error; 844 } 845 846 if (should_fill_mask(ufid_flags)) { 847 err = ovs_nla_put_mask(flow, skb); 848 if (err) 849 goto error; 850 } 851 852 err = ovs_flow_cmd_fill_stats(flow, skb); 853 if (err) 854 goto error; 855 856 if (should_fill_actions(ufid_flags)) { 857 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 858 if (err) 859 goto error; 860 } 861 862 genlmsg_end(skb, ovs_header); 863 return 0; 864 865 error: 866 genlmsg_cancel(skb, ovs_header); 867 return err; 868 } 869 870 /* May not be called with RCU read lock. */ 871 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 872 const struct sw_flow_id *sfid, 873 struct genl_info *info, 874 bool always, 875 uint32_t ufid_flags) 876 { 877 struct sk_buff *skb; 878 size_t len; 879 880 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 881 return NULL; 882 883 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); 884 skb = genlmsg_new(len, GFP_KERNEL); 885 if (!skb) 886 return ERR_PTR(-ENOMEM); 887 888 return skb; 889 } 890 891 /* Called with ovs_mutex. */ 892 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 893 int dp_ifindex, 894 struct genl_info *info, u8 cmd, 895 bool always, u32 ufid_flags) 896 { 897 struct sk_buff *skb; 898 int retval; 899 900 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), 901 &flow->id, info, always, ufid_flags); 902 if (IS_ERR_OR_NULL(skb)) 903 return skb; 904 905 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 906 info->snd_portid, info->snd_seq, 0, 907 cmd, ufid_flags); 908 BUG_ON(retval < 0); 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 BUG_ON(err < 0); 1373 1374 ovs_notify(&dp_flow_genl_family, reply, info); 1375 } else { 1376 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply)); 1377 } 1378 } 1379 1380 ovs_flow_free(flow, true); 1381 return 0; 1382 unlock: 1383 ovs_unlock(); 1384 return err; 1385 } 1386 1387 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1388 { 1389 struct nlattr *a[__OVS_FLOW_ATTR_MAX]; 1390 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1391 struct table_instance *ti; 1392 struct datapath *dp; 1393 u32 ufid_flags; 1394 int err; 1395 1396 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a, 1397 OVS_FLOW_ATTR_MAX, flow_policy, NULL); 1398 if (err) 1399 return err; 1400 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1401 1402 rcu_read_lock(); 1403 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1404 if (!dp) { 1405 rcu_read_unlock(); 1406 return -ENODEV; 1407 } 1408 1409 ti = rcu_dereference(dp->table.ti); 1410 for (;;) { 1411 struct sw_flow *flow; 1412 u32 bucket, obj; 1413 1414 bucket = cb->args[0]; 1415 obj = cb->args[1]; 1416 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1417 if (!flow) 1418 break; 1419 1420 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1421 NETLINK_CB(cb->skb).portid, 1422 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1423 OVS_FLOW_CMD_GET, ufid_flags) < 0) 1424 break; 1425 1426 cb->args[0] = bucket; 1427 cb->args[1] = obj; 1428 } 1429 rcu_read_unlock(); 1430 return skb->len; 1431 } 1432 1433 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1434 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1435 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1436 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1437 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1438 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1439 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, 1440 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, 1441 }; 1442 1443 static const struct genl_ops dp_flow_genl_ops[] = { 1444 { .cmd = OVS_FLOW_CMD_NEW, 1445 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1446 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1447 .doit = ovs_flow_cmd_new 1448 }, 1449 { .cmd = OVS_FLOW_CMD_DEL, 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_del 1453 }, 1454 { .cmd = OVS_FLOW_CMD_GET, 1455 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1456 .flags = 0, /* OK for unprivileged users. */ 1457 .doit = ovs_flow_cmd_get, 1458 .dumpit = ovs_flow_cmd_dump 1459 }, 1460 { .cmd = OVS_FLOW_CMD_SET, 1461 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1462 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1463 .doit = ovs_flow_cmd_set, 1464 }, 1465 }; 1466 1467 static struct genl_family dp_flow_genl_family __ro_after_init = { 1468 .hdrsize = sizeof(struct ovs_header), 1469 .name = OVS_FLOW_FAMILY, 1470 .version = OVS_FLOW_VERSION, 1471 .maxattr = OVS_FLOW_ATTR_MAX, 1472 .policy = flow_policy, 1473 .netnsok = true, 1474 .parallel_ops = true, 1475 .ops = dp_flow_genl_ops, 1476 .n_ops = ARRAY_SIZE(dp_flow_genl_ops), 1477 .mcgrps = &ovs_dp_flow_multicast_group, 1478 .n_mcgrps = 1, 1479 .module = THIS_MODULE, 1480 }; 1481 1482 static size_t ovs_dp_cmd_msg_size(void) 1483 { 1484 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1485 1486 msgsize += nla_total_size(IFNAMSIZ); 1487 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats)); 1488 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats)); 1489 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1490 1491 return msgsize; 1492 } 1493 1494 /* Called with ovs_mutex. */ 1495 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1496 u32 portid, u32 seq, u32 flags, u8 cmd) 1497 { 1498 struct ovs_header *ovs_header; 1499 struct ovs_dp_stats dp_stats; 1500 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1501 int err; 1502 1503 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1504 flags, cmd); 1505 if (!ovs_header) 1506 goto error; 1507 1508 ovs_header->dp_ifindex = get_dpifindex(dp); 1509 1510 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1511 if (err) 1512 goto nla_put_failure; 1513 1514 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1515 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1516 &dp_stats, OVS_DP_ATTR_PAD)) 1517 goto nla_put_failure; 1518 1519 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1520 sizeof(struct ovs_dp_megaflow_stats), 1521 &dp_megaflow_stats, OVS_DP_ATTR_PAD)) 1522 goto nla_put_failure; 1523 1524 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1525 goto nla_put_failure; 1526 1527 genlmsg_end(skb, ovs_header); 1528 return 0; 1529 1530 nla_put_failure: 1531 genlmsg_cancel(skb, ovs_header); 1532 error: 1533 return -EMSGSIZE; 1534 } 1535 1536 static struct sk_buff *ovs_dp_cmd_alloc_info(void) 1537 { 1538 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL); 1539 } 1540 1541 /* Called with rcu_read_lock or ovs_mutex. */ 1542 static struct datapath *lookup_datapath(struct net *net, 1543 const struct ovs_header *ovs_header, 1544 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1545 { 1546 struct datapath *dp; 1547 1548 if (!a[OVS_DP_ATTR_NAME]) 1549 dp = get_dp(net, ovs_header->dp_ifindex); 1550 else { 1551 struct vport *vport; 1552 1553 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1554 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1555 } 1556 return dp ? dp : ERR_PTR(-ENODEV); 1557 } 1558 1559 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info) 1560 { 1561 struct datapath *dp; 1562 1563 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1564 if (IS_ERR(dp)) 1565 return; 1566 1567 WARN(dp->user_features, "Dropping previously announced user features\n"); 1568 dp->user_features = 0; 1569 } 1570 1571 DEFINE_STATIC_KEY_FALSE(tc_recirc_sharing_support); 1572 1573 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1574 { 1575 u32 user_features = 0; 1576 1577 if (a[OVS_DP_ATTR_USER_FEATURES]) { 1578 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1579 1580 if (user_features & ~(OVS_DP_F_VPORT_PIDS | 1581 OVS_DP_F_UNALIGNED | 1582 OVS_DP_F_TC_RECIRC_SHARING)) 1583 return -EOPNOTSUPP; 1584 1585 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT) 1586 if (user_features & OVS_DP_F_TC_RECIRC_SHARING) 1587 return -EOPNOTSUPP; 1588 #endif 1589 } 1590 1591 dp->user_features = user_features; 1592 1593 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) 1594 static_branch_enable(&tc_recirc_sharing_support); 1595 else 1596 static_branch_disable(&tc_recirc_sharing_support); 1597 1598 return 0; 1599 } 1600 1601 static int ovs_dp_stats_init(struct datapath *dp) 1602 { 1603 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1604 if (!dp->stats_percpu) 1605 return -ENOMEM; 1606 1607 return 0; 1608 } 1609 1610 static int ovs_dp_vport_init(struct datapath *dp) 1611 { 1612 int i; 1613 1614 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS, 1615 sizeof(struct hlist_head), 1616 GFP_KERNEL); 1617 if (!dp->ports) 1618 return -ENOMEM; 1619 1620 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1621 INIT_HLIST_HEAD(&dp->ports[i]); 1622 1623 return 0; 1624 } 1625 1626 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1627 { 1628 struct nlattr **a = info->attrs; 1629 struct vport_parms parms; 1630 struct sk_buff *reply; 1631 struct datapath *dp; 1632 struct vport *vport; 1633 struct ovs_net *ovs_net; 1634 int err; 1635 1636 err = -EINVAL; 1637 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1638 goto err; 1639 1640 reply = ovs_dp_cmd_alloc_info(); 1641 if (!reply) 1642 return -ENOMEM; 1643 1644 err = -ENOMEM; 1645 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1646 if (dp == NULL) 1647 goto err_destroy_reply; 1648 1649 ovs_dp_set_net(dp, sock_net(skb->sk)); 1650 1651 /* Allocate table. */ 1652 err = ovs_flow_tbl_init(&dp->table); 1653 if (err) 1654 goto err_destroy_dp; 1655 1656 err = ovs_dp_stats_init(dp); 1657 if (err) 1658 goto err_destroy_table; 1659 1660 err = ovs_dp_vport_init(dp); 1661 if (err) 1662 goto err_destroy_stats; 1663 1664 err = ovs_meters_init(dp); 1665 if (err) 1666 goto err_destroy_ports; 1667 1668 /* Set up our datapath device. */ 1669 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1670 parms.type = OVS_VPORT_TYPE_INTERNAL; 1671 parms.options = NULL; 1672 parms.dp = dp; 1673 parms.port_no = OVSP_LOCAL; 1674 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1675 1676 err = ovs_dp_change(dp, a); 1677 if (err) 1678 goto err_destroy_meters; 1679 1680 /* So far only local changes have been made, now need the lock. */ 1681 ovs_lock(); 1682 1683 vport = new_vport(&parms); 1684 if (IS_ERR(vport)) { 1685 err = PTR_ERR(vport); 1686 if (err == -EBUSY) 1687 err = -EEXIST; 1688 1689 if (err == -EEXIST) { 1690 /* An outdated user space instance that does not understand 1691 * the concept of user_features has attempted to create a new 1692 * datapath and is likely to reuse it. Drop all user features. 1693 */ 1694 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1695 ovs_dp_reset_user_features(skb, info); 1696 } 1697 1698 ovs_unlock(); 1699 goto err_destroy_meters; 1700 } 1701 1702 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1703 info->snd_seq, 0, OVS_DP_CMD_NEW); 1704 BUG_ON(err < 0); 1705 1706 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1707 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1708 1709 ovs_unlock(); 1710 1711 ovs_notify(&dp_datapath_genl_family, reply, info); 1712 return 0; 1713 1714 err_destroy_meters: 1715 ovs_meters_exit(dp); 1716 err_destroy_ports: 1717 kfree(dp->ports); 1718 err_destroy_stats: 1719 free_percpu(dp->stats_percpu); 1720 err_destroy_table: 1721 ovs_flow_tbl_destroy(&dp->table); 1722 err_destroy_dp: 1723 kfree(dp); 1724 err_destroy_reply: 1725 kfree_skb(reply); 1726 err: 1727 return err; 1728 } 1729 1730 /* Called with ovs_mutex. */ 1731 static void __dp_destroy(struct datapath *dp) 1732 { 1733 int i; 1734 1735 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1736 struct vport *vport; 1737 struct hlist_node *n; 1738 1739 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1740 if (vport->port_no != OVSP_LOCAL) 1741 ovs_dp_detach_port(vport); 1742 } 1743 1744 list_del_rcu(&dp->list_node); 1745 1746 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1747 * all ports in datapath are destroyed first before freeing datapath. 1748 */ 1749 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1750 1751 /* RCU destroy the flow table */ 1752 call_rcu(&dp->rcu, destroy_dp_rcu); 1753 } 1754 1755 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1756 { 1757 struct sk_buff *reply; 1758 struct datapath *dp; 1759 int err; 1760 1761 reply = ovs_dp_cmd_alloc_info(); 1762 if (!reply) 1763 return -ENOMEM; 1764 1765 ovs_lock(); 1766 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1767 err = PTR_ERR(dp); 1768 if (IS_ERR(dp)) 1769 goto err_unlock_free; 1770 1771 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1772 info->snd_seq, 0, OVS_DP_CMD_DEL); 1773 BUG_ON(err < 0); 1774 1775 __dp_destroy(dp); 1776 ovs_unlock(); 1777 1778 ovs_notify(&dp_datapath_genl_family, reply, info); 1779 1780 return 0; 1781 1782 err_unlock_free: 1783 ovs_unlock(); 1784 kfree_skb(reply); 1785 return err; 1786 } 1787 1788 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1789 { 1790 struct sk_buff *reply; 1791 struct datapath *dp; 1792 int err; 1793 1794 reply = ovs_dp_cmd_alloc_info(); 1795 if (!reply) 1796 return -ENOMEM; 1797 1798 ovs_lock(); 1799 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1800 err = PTR_ERR(dp); 1801 if (IS_ERR(dp)) 1802 goto err_unlock_free; 1803 1804 err = ovs_dp_change(dp, info->attrs); 1805 if (err) 1806 goto err_unlock_free; 1807 1808 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1809 info->snd_seq, 0, OVS_DP_CMD_SET); 1810 BUG_ON(err < 0); 1811 1812 ovs_unlock(); 1813 ovs_notify(&dp_datapath_genl_family, reply, info); 1814 1815 return 0; 1816 1817 err_unlock_free: 1818 ovs_unlock(); 1819 kfree_skb(reply); 1820 return err; 1821 } 1822 1823 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1824 { 1825 struct sk_buff *reply; 1826 struct datapath *dp; 1827 int err; 1828 1829 reply = ovs_dp_cmd_alloc_info(); 1830 if (!reply) 1831 return -ENOMEM; 1832 1833 ovs_lock(); 1834 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1835 if (IS_ERR(dp)) { 1836 err = PTR_ERR(dp); 1837 goto err_unlock_free; 1838 } 1839 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1840 info->snd_seq, 0, OVS_DP_CMD_GET); 1841 BUG_ON(err < 0); 1842 ovs_unlock(); 1843 1844 return genlmsg_reply(reply, info); 1845 1846 err_unlock_free: 1847 ovs_unlock(); 1848 kfree_skb(reply); 1849 return err; 1850 } 1851 1852 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1853 { 1854 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1855 struct datapath *dp; 1856 int skip = cb->args[0]; 1857 int i = 0; 1858 1859 ovs_lock(); 1860 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1861 if (i >= skip && 1862 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1863 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1864 OVS_DP_CMD_GET) < 0) 1865 break; 1866 i++; 1867 } 1868 ovs_unlock(); 1869 1870 cb->args[0] = i; 1871 1872 return skb->len; 1873 } 1874 1875 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1876 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1877 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1878 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1879 }; 1880 1881 static const struct genl_ops dp_datapath_genl_ops[] = { 1882 { .cmd = OVS_DP_CMD_NEW, 1883 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1884 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1885 .doit = ovs_dp_cmd_new 1886 }, 1887 { .cmd = OVS_DP_CMD_DEL, 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_del 1891 }, 1892 { .cmd = OVS_DP_CMD_GET, 1893 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1894 .flags = 0, /* OK for unprivileged users. */ 1895 .doit = ovs_dp_cmd_get, 1896 .dumpit = ovs_dp_cmd_dump 1897 }, 1898 { .cmd = OVS_DP_CMD_SET, 1899 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1900 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1901 .doit = ovs_dp_cmd_set, 1902 }, 1903 }; 1904 1905 static struct genl_family dp_datapath_genl_family __ro_after_init = { 1906 .hdrsize = sizeof(struct ovs_header), 1907 .name = OVS_DATAPATH_FAMILY, 1908 .version = OVS_DATAPATH_VERSION, 1909 .maxattr = OVS_DP_ATTR_MAX, 1910 .policy = datapath_policy, 1911 .netnsok = true, 1912 .parallel_ops = true, 1913 .ops = dp_datapath_genl_ops, 1914 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops), 1915 .mcgrps = &ovs_dp_datapath_multicast_group, 1916 .n_mcgrps = 1, 1917 .module = THIS_MODULE, 1918 }; 1919 1920 /* Called with ovs_mutex or RCU read lock. */ 1921 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1922 struct net *net, u32 portid, u32 seq, 1923 u32 flags, u8 cmd, gfp_t gfp) 1924 { 1925 struct ovs_header *ovs_header; 1926 struct ovs_vport_stats vport_stats; 1927 int err; 1928 1929 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1930 flags, cmd); 1931 if (!ovs_header) 1932 return -EMSGSIZE; 1933 1934 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1935 1936 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1937 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1938 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 1939 ovs_vport_name(vport)) || 1940 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex)) 1941 goto nla_put_failure; 1942 1943 if (!net_eq(net, dev_net(vport->dev))) { 1944 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp); 1945 1946 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id)) 1947 goto nla_put_failure; 1948 } 1949 1950 ovs_vport_get_stats(vport, &vport_stats); 1951 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS, 1952 sizeof(struct ovs_vport_stats), &vport_stats, 1953 OVS_VPORT_ATTR_PAD)) 1954 goto nla_put_failure; 1955 1956 if (ovs_vport_get_upcall_portids(vport, skb)) 1957 goto nla_put_failure; 1958 1959 err = ovs_vport_get_options(vport, skb); 1960 if (err == -EMSGSIZE) 1961 goto error; 1962 1963 genlmsg_end(skb, ovs_header); 1964 return 0; 1965 1966 nla_put_failure: 1967 err = -EMSGSIZE; 1968 error: 1969 genlmsg_cancel(skb, ovs_header); 1970 return err; 1971 } 1972 1973 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 1974 { 1975 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1976 } 1977 1978 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 1979 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net, 1980 u32 portid, u32 seq, u8 cmd) 1981 { 1982 struct sk_buff *skb; 1983 int retval; 1984 1985 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1986 if (!skb) 1987 return ERR_PTR(-ENOMEM); 1988 1989 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd, 1990 GFP_KERNEL); 1991 BUG_ON(retval < 0); 1992 1993 return skb; 1994 } 1995 1996 /* Called with ovs_mutex or RCU read lock. */ 1997 static struct vport *lookup_vport(struct net *net, 1998 const struct ovs_header *ovs_header, 1999 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 2000 { 2001 struct datapath *dp; 2002 struct vport *vport; 2003 2004 if (a[OVS_VPORT_ATTR_IFINDEX]) 2005 return ERR_PTR(-EOPNOTSUPP); 2006 if (a[OVS_VPORT_ATTR_NAME]) { 2007 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 2008 if (!vport) 2009 return ERR_PTR(-ENODEV); 2010 if (ovs_header->dp_ifindex && 2011 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 2012 return ERR_PTR(-ENODEV); 2013 return vport; 2014 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 2015 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 2016 2017 if (port_no >= DP_MAX_PORTS) 2018 return ERR_PTR(-EFBIG); 2019 2020 dp = get_dp(net, ovs_header->dp_ifindex); 2021 if (!dp) 2022 return ERR_PTR(-ENODEV); 2023 2024 vport = ovs_vport_ovsl_rcu(dp, port_no); 2025 if (!vport) 2026 return ERR_PTR(-ENODEV); 2027 return vport; 2028 } else 2029 return ERR_PTR(-EINVAL); 2030 2031 } 2032 2033 static unsigned int ovs_get_max_headroom(struct datapath *dp) 2034 { 2035 unsigned int dev_headroom, max_headroom = 0; 2036 struct net_device *dev; 2037 struct vport *vport; 2038 int i; 2039 2040 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2041 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2042 dev = vport->dev; 2043 dev_headroom = netdev_get_fwd_headroom(dev); 2044 if (dev_headroom > max_headroom) 2045 max_headroom = dev_headroom; 2046 } 2047 } 2048 2049 return max_headroom; 2050 } 2051 2052 /* Called with ovs_mutex */ 2053 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom) 2054 { 2055 struct vport *vport; 2056 int i; 2057 2058 dp->max_headroom = new_headroom; 2059 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 2060 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) 2061 netdev_set_rx_headroom(vport->dev, new_headroom); 2062 } 2063 2064 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 2065 { 2066 struct nlattr **a = info->attrs; 2067 struct ovs_header *ovs_header = info->userhdr; 2068 struct vport_parms parms; 2069 struct sk_buff *reply; 2070 struct vport *vport; 2071 struct datapath *dp; 2072 unsigned int new_headroom; 2073 u32 port_no; 2074 int err; 2075 2076 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 2077 !a[OVS_VPORT_ATTR_UPCALL_PID]) 2078 return -EINVAL; 2079 if (a[OVS_VPORT_ATTR_IFINDEX]) 2080 return -EOPNOTSUPP; 2081 2082 port_no = a[OVS_VPORT_ATTR_PORT_NO] 2083 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 2084 if (port_no >= DP_MAX_PORTS) 2085 return -EFBIG; 2086 2087 reply = ovs_vport_cmd_alloc_info(); 2088 if (!reply) 2089 return -ENOMEM; 2090 2091 ovs_lock(); 2092 restart: 2093 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 2094 err = -ENODEV; 2095 if (!dp) 2096 goto exit_unlock_free; 2097 2098 if (port_no) { 2099 vport = ovs_vport_ovsl(dp, port_no); 2100 err = -EBUSY; 2101 if (vport) 2102 goto exit_unlock_free; 2103 } else { 2104 for (port_no = 1; ; port_no++) { 2105 if (port_no >= DP_MAX_PORTS) { 2106 err = -EFBIG; 2107 goto exit_unlock_free; 2108 } 2109 vport = ovs_vport_ovsl(dp, port_no); 2110 if (!vport) 2111 break; 2112 } 2113 } 2114 2115 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 2116 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 2117 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 2118 parms.dp = dp; 2119 parms.port_no = port_no; 2120 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2121 2122 vport = new_vport(&parms); 2123 err = PTR_ERR(vport); 2124 if (IS_ERR(vport)) { 2125 if (err == -EAGAIN) 2126 goto restart; 2127 goto exit_unlock_free; 2128 } 2129 2130 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2131 info->snd_portid, info->snd_seq, 0, 2132 OVS_VPORT_CMD_NEW, GFP_KERNEL); 2133 2134 new_headroom = netdev_get_fwd_headroom(vport->dev); 2135 2136 if (new_headroom > dp->max_headroom) 2137 ovs_update_headroom(dp, new_headroom); 2138 else 2139 netdev_set_rx_headroom(vport->dev, dp->max_headroom); 2140 2141 BUG_ON(err < 0); 2142 ovs_unlock(); 2143 2144 ovs_notify(&dp_vport_genl_family, reply, info); 2145 return 0; 2146 2147 exit_unlock_free: 2148 ovs_unlock(); 2149 kfree_skb(reply); 2150 return err; 2151 } 2152 2153 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 2154 { 2155 struct nlattr **a = info->attrs; 2156 struct sk_buff *reply; 2157 struct vport *vport; 2158 int err; 2159 2160 reply = ovs_vport_cmd_alloc_info(); 2161 if (!reply) 2162 return -ENOMEM; 2163 2164 ovs_lock(); 2165 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2166 err = PTR_ERR(vport); 2167 if (IS_ERR(vport)) 2168 goto exit_unlock_free; 2169 2170 if (a[OVS_VPORT_ATTR_TYPE] && 2171 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 2172 err = -EINVAL; 2173 goto exit_unlock_free; 2174 } 2175 2176 if (a[OVS_VPORT_ATTR_OPTIONS]) { 2177 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 2178 if (err) 2179 goto exit_unlock_free; 2180 } 2181 2182 2183 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 2184 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2185 2186 err = ovs_vport_set_upcall_portids(vport, ids); 2187 if (err) 2188 goto exit_unlock_free; 2189 } 2190 2191 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2192 info->snd_portid, info->snd_seq, 0, 2193 OVS_VPORT_CMD_SET, GFP_KERNEL); 2194 BUG_ON(err < 0); 2195 2196 ovs_unlock(); 2197 ovs_notify(&dp_vport_genl_family, reply, info); 2198 return 0; 2199 2200 exit_unlock_free: 2201 ovs_unlock(); 2202 kfree_skb(reply); 2203 return err; 2204 } 2205 2206 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2207 { 2208 bool update_headroom = false; 2209 struct nlattr **a = info->attrs; 2210 struct sk_buff *reply; 2211 struct datapath *dp; 2212 struct vport *vport; 2213 unsigned int new_headroom; 2214 int err; 2215 2216 reply = ovs_vport_cmd_alloc_info(); 2217 if (!reply) 2218 return -ENOMEM; 2219 2220 ovs_lock(); 2221 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2222 err = PTR_ERR(vport); 2223 if (IS_ERR(vport)) 2224 goto exit_unlock_free; 2225 2226 if (vport->port_no == OVSP_LOCAL) { 2227 err = -EINVAL; 2228 goto exit_unlock_free; 2229 } 2230 2231 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2232 info->snd_portid, info->snd_seq, 0, 2233 OVS_VPORT_CMD_DEL, GFP_KERNEL); 2234 BUG_ON(err < 0); 2235 2236 /* the vport deletion may trigger dp headroom update */ 2237 dp = vport->dp; 2238 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom) 2239 update_headroom = true; 2240 2241 netdev_reset_rx_headroom(vport->dev); 2242 ovs_dp_detach_port(vport); 2243 2244 if (update_headroom) { 2245 new_headroom = ovs_get_max_headroom(dp); 2246 2247 if (new_headroom < dp->max_headroom) 2248 ovs_update_headroom(dp, new_headroom); 2249 } 2250 ovs_unlock(); 2251 2252 ovs_notify(&dp_vport_genl_family, reply, info); 2253 return 0; 2254 2255 exit_unlock_free: 2256 ovs_unlock(); 2257 kfree_skb(reply); 2258 return err; 2259 } 2260 2261 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2262 { 2263 struct nlattr **a = info->attrs; 2264 struct ovs_header *ovs_header = info->userhdr; 2265 struct sk_buff *reply; 2266 struct vport *vport; 2267 int err; 2268 2269 reply = ovs_vport_cmd_alloc_info(); 2270 if (!reply) 2271 return -ENOMEM; 2272 2273 rcu_read_lock(); 2274 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2275 err = PTR_ERR(vport); 2276 if (IS_ERR(vport)) 2277 goto exit_unlock_free; 2278 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2279 info->snd_portid, info->snd_seq, 0, 2280 OVS_VPORT_CMD_GET, GFP_ATOMIC); 2281 BUG_ON(err < 0); 2282 rcu_read_unlock(); 2283 2284 return genlmsg_reply(reply, info); 2285 2286 exit_unlock_free: 2287 rcu_read_unlock(); 2288 kfree_skb(reply); 2289 return err; 2290 } 2291 2292 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2293 { 2294 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2295 struct datapath *dp; 2296 int bucket = cb->args[0], skip = cb->args[1]; 2297 int i, j = 0; 2298 2299 rcu_read_lock(); 2300 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2301 if (!dp) { 2302 rcu_read_unlock(); 2303 return -ENODEV; 2304 } 2305 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2306 struct vport *vport; 2307 2308 j = 0; 2309 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2310 if (j >= skip && 2311 ovs_vport_cmd_fill_info(vport, skb, 2312 sock_net(skb->sk), 2313 NETLINK_CB(cb->skb).portid, 2314 cb->nlh->nlmsg_seq, 2315 NLM_F_MULTI, 2316 OVS_VPORT_CMD_GET, 2317 GFP_ATOMIC) < 0) 2318 goto out; 2319 2320 j++; 2321 } 2322 skip = 0; 2323 } 2324 out: 2325 rcu_read_unlock(); 2326 2327 cb->args[0] = i; 2328 cb->args[1] = j; 2329 2330 return skb->len; 2331 } 2332 2333 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2334 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2335 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2336 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2337 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2338 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC }, 2339 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2340 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 }, 2341 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 }, 2342 }; 2343 2344 static const struct genl_ops dp_vport_genl_ops[] = { 2345 { .cmd = OVS_VPORT_CMD_NEW, 2346 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2347 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2348 .doit = ovs_vport_cmd_new 2349 }, 2350 { .cmd = OVS_VPORT_CMD_DEL, 2351 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2352 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2353 .doit = ovs_vport_cmd_del 2354 }, 2355 { .cmd = OVS_VPORT_CMD_GET, 2356 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2357 .flags = 0, /* OK for unprivileged users. */ 2358 .doit = ovs_vport_cmd_get, 2359 .dumpit = ovs_vport_cmd_dump 2360 }, 2361 { .cmd = OVS_VPORT_CMD_SET, 2362 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2363 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2364 .doit = ovs_vport_cmd_set, 2365 }, 2366 }; 2367 2368 struct genl_family dp_vport_genl_family __ro_after_init = { 2369 .hdrsize = sizeof(struct ovs_header), 2370 .name = OVS_VPORT_FAMILY, 2371 .version = OVS_VPORT_VERSION, 2372 .maxattr = OVS_VPORT_ATTR_MAX, 2373 .policy = vport_policy, 2374 .netnsok = true, 2375 .parallel_ops = true, 2376 .ops = dp_vport_genl_ops, 2377 .n_ops = ARRAY_SIZE(dp_vport_genl_ops), 2378 .mcgrps = &ovs_dp_vport_multicast_group, 2379 .n_mcgrps = 1, 2380 .module = THIS_MODULE, 2381 }; 2382 2383 static struct genl_family * const dp_genl_families[] = { 2384 &dp_datapath_genl_family, 2385 &dp_vport_genl_family, 2386 &dp_flow_genl_family, 2387 &dp_packet_genl_family, 2388 &dp_meter_genl_family, 2389 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 2390 &dp_ct_limit_genl_family, 2391 #endif 2392 }; 2393 2394 static void dp_unregister_genl(int n_families) 2395 { 2396 int i; 2397 2398 for (i = 0; i < n_families; i++) 2399 genl_unregister_family(dp_genl_families[i]); 2400 } 2401 2402 static int __init dp_register_genl(void) 2403 { 2404 int err; 2405 int i; 2406 2407 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2408 2409 err = genl_register_family(dp_genl_families[i]); 2410 if (err) 2411 goto error; 2412 } 2413 2414 return 0; 2415 2416 error: 2417 dp_unregister_genl(i); 2418 return err; 2419 } 2420 2421 static int __net_init ovs_init_net(struct net *net) 2422 { 2423 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2424 2425 INIT_LIST_HEAD(&ovs_net->dps); 2426 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2427 return ovs_ct_init(net); 2428 } 2429 2430 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2431 struct list_head *head) 2432 { 2433 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2434 struct datapath *dp; 2435 2436 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2437 int i; 2438 2439 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2440 struct vport *vport; 2441 2442 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2443 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2444 continue; 2445 2446 if (dev_net(vport->dev) == dnet) 2447 list_add(&vport->detach_list, head); 2448 } 2449 } 2450 } 2451 } 2452 2453 static void __net_exit ovs_exit_net(struct net *dnet) 2454 { 2455 struct datapath *dp, *dp_next; 2456 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2457 struct vport *vport, *vport_next; 2458 struct net *net; 2459 LIST_HEAD(head); 2460 2461 ovs_ct_exit(dnet); 2462 ovs_lock(); 2463 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2464 __dp_destroy(dp); 2465 2466 down_read(&net_rwsem); 2467 for_each_net(net) 2468 list_vports_from_net(net, dnet, &head); 2469 up_read(&net_rwsem); 2470 2471 /* Detach all vports from given namespace. */ 2472 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2473 list_del(&vport->detach_list); 2474 ovs_dp_detach_port(vport); 2475 } 2476 2477 ovs_unlock(); 2478 2479 cancel_work_sync(&ovs_net->dp_notify_work); 2480 } 2481 2482 static struct pernet_operations ovs_net_ops = { 2483 .init = ovs_init_net, 2484 .exit = ovs_exit_net, 2485 .id = &ovs_net_id, 2486 .size = sizeof(struct ovs_net), 2487 }; 2488 2489 static int __init dp_init(void) 2490 { 2491 int err; 2492 2493 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); 2494 2495 pr_info("Open vSwitch switching datapath\n"); 2496 2497 err = action_fifos_init(); 2498 if (err) 2499 goto error; 2500 2501 err = ovs_internal_dev_rtnl_link_register(); 2502 if (err) 2503 goto error_action_fifos_exit; 2504 2505 err = ovs_flow_init(); 2506 if (err) 2507 goto error_unreg_rtnl_link; 2508 2509 err = ovs_vport_init(); 2510 if (err) 2511 goto error_flow_exit; 2512 2513 err = register_pernet_device(&ovs_net_ops); 2514 if (err) 2515 goto error_vport_exit; 2516 2517 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2518 if (err) 2519 goto error_netns_exit; 2520 2521 err = ovs_netdev_init(); 2522 if (err) 2523 goto error_unreg_notifier; 2524 2525 err = dp_register_genl(); 2526 if (err < 0) 2527 goto error_unreg_netdev; 2528 2529 return 0; 2530 2531 error_unreg_netdev: 2532 ovs_netdev_exit(); 2533 error_unreg_notifier: 2534 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2535 error_netns_exit: 2536 unregister_pernet_device(&ovs_net_ops); 2537 error_vport_exit: 2538 ovs_vport_exit(); 2539 error_flow_exit: 2540 ovs_flow_exit(); 2541 error_unreg_rtnl_link: 2542 ovs_internal_dev_rtnl_link_unregister(); 2543 error_action_fifos_exit: 2544 action_fifos_exit(); 2545 error: 2546 return err; 2547 } 2548 2549 static void dp_cleanup(void) 2550 { 2551 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2552 ovs_netdev_exit(); 2553 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2554 unregister_pernet_device(&ovs_net_ops); 2555 rcu_barrier(); 2556 ovs_vport_exit(); 2557 ovs_flow_exit(); 2558 ovs_internal_dev_rtnl_link_unregister(); 2559 action_fifos_exit(); 2560 } 2561 2562 module_init(dp_init); 2563 module_exit(dp_cleanup); 2564 2565 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2566 MODULE_LICENSE("GPL"); 2567 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY); 2568 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY); 2569 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY); 2570 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY); 2571 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY); 2572 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY); 2573