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