1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2007-2014 Nicira, Inc. 4 */ 5 6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7 8 #include <linux/init.h> 9 #include <linux/module.h> 10 #include <linux/if_arp.h> 11 #include <linux/if_vlan.h> 12 #include <linux/in.h> 13 #include <linux/ip.h> 14 #include <linux/jhash.h> 15 #include <linux/delay.h> 16 #include <linux/time.h> 17 #include <linux/etherdevice.h> 18 #include <linux/genetlink.h> 19 #include <linux/kernel.h> 20 #include <linux/kthread.h> 21 #include <linux/mutex.h> 22 #include <linux/percpu.h> 23 #include <linux/rcupdate.h> 24 #include <linux/tcp.h> 25 #include <linux/udp.h> 26 #include <linux/ethtool.h> 27 #include <linux/wait.h> 28 #include <asm/div64.h> 29 #include <linux/highmem.h> 30 #include <linux/netfilter_bridge.h> 31 #include <linux/netfilter_ipv4.h> 32 #include <linux/inetdevice.h> 33 #include <linux/list.h> 34 #include <linux/openvswitch.h> 35 #include <linux/rculist.h> 36 #include <linux/dmi.h> 37 #include <net/genetlink.h> 38 #include <net/net_namespace.h> 39 #include <net/netns/generic.h> 40 41 #include "datapath.h" 42 #include "flow.h" 43 #include "flow_table.h" 44 #include "flow_netlink.h" 45 #include "meter.h" 46 #include "vport-internal_dev.h" 47 #include "vport-netdev.h" 48 49 unsigned int ovs_net_id __read_mostly; 50 51 static struct genl_family dp_packet_genl_family; 52 static struct genl_family dp_flow_genl_family; 53 static struct genl_family dp_datapath_genl_family; 54 55 static const struct nla_policy flow_policy[]; 56 57 static const struct genl_multicast_group ovs_dp_flow_multicast_group = { 58 .name = OVS_FLOW_MCGROUP, 59 }; 60 61 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = { 62 .name = OVS_DATAPATH_MCGROUP, 63 }; 64 65 static const struct genl_multicast_group ovs_dp_vport_multicast_group = { 66 .name = OVS_VPORT_MCGROUP, 67 }; 68 69 /* Check if need to build a reply message. 70 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */ 71 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info, 72 unsigned int group) 73 { 74 return info->nlhdr->nlmsg_flags & NLM_F_ECHO || 75 genl_has_listeners(family, genl_info_net(info), group); 76 } 77 78 static void ovs_notify(struct genl_family *family, 79 struct sk_buff *skb, struct genl_info *info) 80 { 81 genl_notify(family, skb, info, 0, GFP_KERNEL); 82 } 83 84 /** 85 * DOC: Locking: 86 * 87 * All writes e.g. Writes to device state (add/remove datapath, port, set 88 * operations on vports, etc.), Writes to other state (flow table 89 * modifications, set miscellaneous datapath parameters, etc.) are protected 90 * by ovs_lock. 91 * 92 * Reads are protected by RCU. 93 * 94 * There are a few special cases (mostly stats) that have their own 95 * synchronization but they nest under all of above and don't interact with 96 * each other. 97 * 98 * The RTNL lock nests inside ovs_mutex. 99 */ 100 101 static DEFINE_MUTEX(ovs_mutex); 102 103 void ovs_lock(void) 104 { 105 mutex_lock(&ovs_mutex); 106 } 107 108 void ovs_unlock(void) 109 { 110 mutex_unlock(&ovs_mutex); 111 } 112 113 #ifdef CONFIG_LOCKDEP 114 int lockdep_ovsl_is_held(void) 115 { 116 if (debug_locks) 117 return lockdep_is_held(&ovs_mutex); 118 else 119 return 1; 120 } 121 #endif 122 123 static struct vport *new_vport(const struct vport_parms *); 124 static int queue_gso_packets(struct datapath *dp, struct sk_buff *, 125 const struct sw_flow_key *, 126 const struct dp_upcall_info *, 127 uint32_t cutlen); 128 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *, 129 const struct sw_flow_key *, 130 const struct dp_upcall_info *, 131 uint32_t cutlen); 132 133 /* Must be called with rcu_read_lock or ovs_mutex. */ 134 const char *ovs_dp_name(const struct datapath *dp) 135 { 136 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); 137 return ovs_vport_name(vport); 138 } 139 140 static int get_dpifindex(const struct datapath *dp) 141 { 142 struct vport *local; 143 int ifindex; 144 145 rcu_read_lock(); 146 147 local = ovs_vport_rcu(dp, OVSP_LOCAL); 148 if (local) 149 ifindex = local->dev->ifindex; 150 else 151 ifindex = 0; 152 153 rcu_read_unlock(); 154 155 return ifindex; 156 } 157 158 static void destroy_dp_rcu(struct rcu_head *rcu) 159 { 160 struct datapath *dp = container_of(rcu, struct datapath, rcu); 161 162 ovs_flow_tbl_destroy(&dp->table); 163 free_percpu(dp->stats_percpu); 164 kfree(dp->ports); 165 ovs_meters_exit(dp); 166 kfree(dp); 167 } 168 169 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 170 u16 port_no) 171 { 172 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 173 } 174 175 /* Called with ovs_mutex or RCU read lock. */ 176 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 177 { 178 struct vport *vport; 179 struct hlist_head *head; 180 181 head = vport_hash_bucket(dp, port_no); 182 hlist_for_each_entry_rcu(vport, head, dp_hash_node, 183 lockdep_ovsl_is_held()) { 184 if (vport->port_no == port_no) 185 return vport; 186 } 187 return NULL; 188 } 189 190 /* Called with ovs_mutex. */ 191 static struct vport *new_vport(const struct vport_parms *parms) 192 { 193 struct vport *vport; 194 195 vport = ovs_vport_add(parms); 196 if (!IS_ERR(vport)) { 197 struct datapath *dp = parms->dp; 198 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 199 200 hlist_add_head_rcu(&vport->dp_hash_node, head); 201 } 202 return vport; 203 } 204 205 void ovs_dp_detach_port(struct vport *p) 206 { 207 ASSERT_OVSL(); 208 209 /* First drop references to device. */ 210 hlist_del_rcu(&p->dp_hash_node); 211 212 /* Then destroy it. */ 213 ovs_vport_del(p); 214 } 215 216 /* Must be called with rcu_read_lock. */ 217 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key) 218 { 219 const struct vport *p = OVS_CB(skb)->input_vport; 220 struct datapath *dp = p->dp; 221 struct sw_flow *flow; 222 struct sw_flow_actions *sf_acts; 223 struct dp_stats_percpu *stats; 224 u64 *stats_counter; 225 u32 n_mask_hit; 226 int error; 227 228 stats = this_cpu_ptr(dp->stats_percpu); 229 230 /* Look up flow. */ 231 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb), 232 &n_mask_hit); 233 if (unlikely(!flow)) { 234 struct dp_upcall_info upcall; 235 236 memset(&upcall, 0, sizeof(upcall)); 237 upcall.cmd = OVS_PACKET_CMD_MISS; 238 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 239 upcall.mru = OVS_CB(skb)->mru; 240 error = ovs_dp_upcall(dp, skb, key, &upcall, 0); 241 if (unlikely(error)) 242 kfree_skb(skb); 243 else 244 consume_skb(skb); 245 stats_counter = &stats->n_missed; 246 goto out; 247 } 248 249 ovs_flow_stats_update(flow, key->tp.flags, skb); 250 sf_acts = rcu_dereference(flow->sf_acts); 251 error = ovs_execute_actions(dp, skb, sf_acts, key); 252 if (unlikely(error)) 253 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n", 254 ovs_dp_name(dp), error); 255 256 stats_counter = &stats->n_hit; 257 258 out: 259 /* Update datapath statistics. */ 260 u64_stats_update_begin(&stats->syncp); 261 (*stats_counter)++; 262 stats->n_mask_hit += n_mask_hit; 263 u64_stats_update_end(&stats->syncp); 264 } 265 266 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 267 const struct sw_flow_key *key, 268 const struct dp_upcall_info *upcall_info, 269 uint32_t cutlen) 270 { 271 struct dp_stats_percpu *stats; 272 int err; 273 274 if (upcall_info->portid == 0) { 275 err = -ENOTCONN; 276 goto err; 277 } 278 279 if (!skb_is_gso(skb)) 280 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 281 else 282 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen); 283 if (err) 284 goto err; 285 286 return 0; 287 288 err: 289 stats = this_cpu_ptr(dp->stats_percpu); 290 291 u64_stats_update_begin(&stats->syncp); 292 stats->n_lost++; 293 u64_stats_update_end(&stats->syncp); 294 295 return err; 296 } 297 298 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 299 const struct sw_flow_key *key, 300 const struct dp_upcall_info *upcall_info, 301 uint32_t cutlen) 302 { 303 unsigned int gso_type = skb_shinfo(skb)->gso_type; 304 struct sw_flow_key later_key; 305 struct sk_buff *segs, *nskb; 306 int err; 307 308 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET); 309 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 310 if (IS_ERR(segs)) 311 return PTR_ERR(segs); 312 if (segs == NULL) 313 return -EINVAL; 314 315 if (gso_type & SKB_GSO_UDP) { 316 /* The initial flow key extracted by ovs_flow_key_extract() 317 * in this case is for a first fragment, so we need to 318 * properly mark later fragments. 319 */ 320 later_key = *key; 321 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 322 } 323 324 /* Queue all of the segments. */ 325 skb_list_walk_safe(segs, skb, nskb) { 326 if (gso_type & SKB_GSO_UDP && skb != segs) 327 key = &later_key; 328 329 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 330 if (err) 331 break; 332 333 } 334 335 /* Free all of the segments. */ 336 skb_list_walk_safe(segs, skb, nskb) { 337 if (err) 338 kfree_skb(skb); 339 else 340 consume_skb(skb); 341 } 342 return err; 343 } 344 345 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, 346 unsigned int hdrlen, int actions_attrlen) 347 { 348 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 349 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 350 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */ 351 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */ 352 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */ 353 354 /* OVS_PACKET_ATTR_USERDATA */ 355 if (upcall_info->userdata) 356 size += NLA_ALIGN(upcall_info->userdata->nla_len); 357 358 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ 359 if (upcall_info->egress_tun_info) 360 size += nla_total_size(ovs_tun_key_attr_size()); 361 362 /* OVS_PACKET_ATTR_ACTIONS */ 363 if (upcall_info->actions_len) 364 size += nla_total_size(actions_attrlen); 365 366 /* OVS_PACKET_ATTR_MRU */ 367 if (upcall_info->mru) 368 size += nla_total_size(sizeof(upcall_info->mru)); 369 370 return size; 371 } 372 373 static void pad_packet(struct datapath *dp, struct sk_buff *skb) 374 { 375 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 376 size_t plen = NLA_ALIGN(skb->len) - skb->len; 377 378 if (plen > 0) 379 skb_put_zero(skb, plen); 380 } 381 } 382 383 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 384 const struct sw_flow_key *key, 385 const struct dp_upcall_info *upcall_info, 386 uint32_t cutlen) 387 { 388 struct ovs_header *upcall; 389 struct sk_buff *nskb = NULL; 390 struct sk_buff *user_skb = NULL; /* to be queued to userspace */ 391 struct nlattr *nla; 392 size_t len; 393 unsigned int hlen; 394 int err, dp_ifindex; 395 u64 hash; 396 397 dp_ifindex = get_dpifindex(dp); 398 if (!dp_ifindex) 399 return -ENODEV; 400 401 if (skb_vlan_tag_present(skb)) { 402 nskb = skb_clone(skb, GFP_ATOMIC); 403 if (!nskb) 404 return -ENOMEM; 405 406 nskb = __vlan_hwaccel_push_inside(nskb); 407 if (!nskb) 408 return -ENOMEM; 409 410 skb = nskb; 411 } 412 413 if (nla_attr_size(skb->len) > USHRT_MAX) { 414 err = -EFBIG; 415 goto out; 416 } 417 418 /* Complete checksum if needed */ 419 if (skb->ip_summed == CHECKSUM_PARTIAL && 420 (err = skb_csum_hwoffload_help(skb, 0))) 421 goto out; 422 423 /* Older versions of OVS user space enforce alignment of the last 424 * Netlink attribute to NLA_ALIGNTO which would require extensive 425 * padding logic. Only perform zerocopy if padding is not required. 426 */ 427 if (dp->user_features & OVS_DP_F_UNALIGNED) 428 hlen = skb_zerocopy_headlen(skb); 429 else 430 hlen = skb->len; 431 432 len = upcall_msg_size(upcall_info, hlen - cutlen, 433 OVS_CB(skb)->acts_origlen); 434 user_skb = genlmsg_new(len, GFP_ATOMIC); 435 if (!user_skb) { 436 err = -ENOMEM; 437 goto out; 438 } 439 440 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 441 0, upcall_info->cmd); 442 if (!upcall) { 443 err = -EINVAL; 444 goto out; 445 } 446 upcall->dp_ifindex = dp_ifindex; 447 448 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); 449 if (err) 450 goto out; 451 452 if (upcall_info->userdata) 453 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 454 nla_len(upcall_info->userdata), 455 nla_data(upcall_info->userdata)); 456 457 if (upcall_info->egress_tun_info) { 458 nla = nla_nest_start_noflag(user_skb, 459 OVS_PACKET_ATTR_EGRESS_TUN_KEY); 460 if (!nla) { 461 err = -EMSGSIZE; 462 goto out; 463 } 464 err = ovs_nla_put_tunnel_info(user_skb, 465 upcall_info->egress_tun_info); 466 if (err) 467 goto out; 468 469 nla_nest_end(user_skb, nla); 470 } 471 472 if (upcall_info->actions_len) { 473 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS); 474 if (!nla) { 475 err = -EMSGSIZE; 476 goto out; 477 } 478 err = ovs_nla_put_actions(upcall_info->actions, 479 upcall_info->actions_len, 480 user_skb); 481 if (!err) 482 nla_nest_end(user_skb, nla); 483 else 484 nla_nest_cancel(user_skb, nla); 485 } 486 487 /* Add OVS_PACKET_ATTR_MRU */ 488 if (upcall_info->mru && 489 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) { 490 err = -ENOBUFS; 491 goto out; 492 } 493 494 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */ 495 if (cutlen > 0 && 496 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) { 497 err = -ENOBUFS; 498 goto out; 499 } 500 501 /* Add OVS_PACKET_ATTR_HASH */ 502 hash = skb_get_hash_raw(skb); 503 if (skb->sw_hash) 504 hash |= OVS_PACKET_HASH_SW_BIT; 505 506 if (skb->l4_hash) 507 hash |= OVS_PACKET_HASH_L4_BIT; 508 509 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) { 510 err = -ENOBUFS; 511 goto out; 512 } 513 514 /* Only reserve room for attribute header, packet data is added 515 * in skb_zerocopy() */ 516 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 517 err = -ENOBUFS; 518 goto out; 519 } 520 nla->nla_len = nla_attr_size(skb->len - cutlen); 521 522 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen); 523 if (err) 524 goto out; 525 526 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 527 pad_packet(dp, user_skb); 528 529 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 530 531 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 532 user_skb = NULL; 533 out: 534 if (err) 535 skb_tx_error(skb); 536 kfree_skb(user_skb); 537 kfree_skb(nskb); 538 return err; 539 } 540 541 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 542 { 543 struct ovs_header *ovs_header = info->userhdr; 544 struct net *net = sock_net(skb->sk); 545 struct nlattr **a = info->attrs; 546 struct sw_flow_actions *acts; 547 struct sk_buff *packet; 548 struct sw_flow *flow; 549 struct sw_flow_actions *sf_acts; 550 struct datapath *dp; 551 struct vport *input_vport; 552 u16 mru = 0; 553 u64 hash; 554 int len; 555 int err; 556 bool log = !a[OVS_PACKET_ATTR_PROBE]; 557 558 err = -EINVAL; 559 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 560 !a[OVS_PACKET_ATTR_ACTIONS]) 561 goto err; 562 563 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 564 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 565 err = -ENOMEM; 566 if (!packet) 567 goto err; 568 skb_reserve(packet, NET_IP_ALIGN); 569 570 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 571 572 /* Set packet's mru */ 573 if (a[OVS_PACKET_ATTR_MRU]) { 574 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]); 575 packet->ignore_df = 1; 576 } 577 OVS_CB(packet)->mru = mru; 578 579 if (a[OVS_PACKET_ATTR_HASH]) { 580 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]); 581 582 __skb_set_hash(packet, hash & 0xFFFFFFFFULL, 583 !!(hash & OVS_PACKET_HASH_SW_BIT), 584 !!(hash & OVS_PACKET_HASH_L4_BIT)); 585 } 586 587 /* Build an sw_flow for sending this packet. */ 588 flow = ovs_flow_alloc(); 589 err = PTR_ERR(flow); 590 if (IS_ERR(flow)) 591 goto err_kfree_skb; 592 593 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY], 594 packet, &flow->key, log); 595 if (err) 596 goto err_flow_free; 597 598 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS], 599 &flow->key, &acts, log); 600 if (err) 601 goto err_flow_free; 602 603 rcu_assign_pointer(flow->sf_acts, acts); 604 packet->priority = flow->key.phy.priority; 605 packet->mark = flow->key.phy.skb_mark; 606 607 rcu_read_lock(); 608 dp = get_dp_rcu(net, ovs_header->dp_ifindex); 609 err = -ENODEV; 610 if (!dp) 611 goto err_unlock; 612 613 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 614 if (!input_vport) 615 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 616 617 if (!input_vport) 618 goto err_unlock; 619 620 packet->dev = input_vport->dev; 621 OVS_CB(packet)->input_vport = input_vport; 622 sf_acts = rcu_dereference(flow->sf_acts); 623 624 local_bh_disable(); 625 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); 626 local_bh_enable(); 627 rcu_read_unlock(); 628 629 ovs_flow_free(flow, false); 630 return err; 631 632 err_unlock: 633 rcu_read_unlock(); 634 err_flow_free: 635 ovs_flow_free(flow, false); 636 err_kfree_skb: 637 kfree_skb(packet); 638 err: 639 return err; 640 } 641 642 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 643 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 644 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 645 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 646 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, 647 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, 648 [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 }, 649 }; 650 651 static const struct genl_ops dp_packet_genl_ops[] = { 652 { .cmd = OVS_PACKET_CMD_EXECUTE, 653 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 654 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 655 .doit = ovs_packet_cmd_execute 656 } 657 }; 658 659 static struct genl_family dp_packet_genl_family __ro_after_init = { 660 .hdrsize = sizeof(struct ovs_header), 661 .name = OVS_PACKET_FAMILY, 662 .version = OVS_PACKET_VERSION, 663 .maxattr = OVS_PACKET_ATTR_MAX, 664 .policy = packet_policy, 665 .netnsok = true, 666 .parallel_ops = true, 667 .ops = dp_packet_genl_ops, 668 .n_ops = ARRAY_SIZE(dp_packet_genl_ops), 669 .module = THIS_MODULE, 670 }; 671 672 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 673 struct ovs_dp_megaflow_stats *mega_stats) 674 { 675 int i; 676 677 memset(mega_stats, 0, sizeof(*mega_stats)); 678 679 stats->n_flows = ovs_flow_tbl_count(&dp->table); 680 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 681 682 stats->n_hit = stats->n_missed = stats->n_lost = 0; 683 684 for_each_possible_cpu(i) { 685 const struct dp_stats_percpu *percpu_stats; 686 struct dp_stats_percpu local_stats; 687 unsigned int start; 688 689 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 690 691 do { 692 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 693 local_stats = *percpu_stats; 694 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 695 696 stats->n_hit += local_stats.n_hit; 697 stats->n_missed += local_stats.n_missed; 698 stats->n_lost += local_stats.n_lost; 699 mega_stats->n_mask_hit += local_stats.n_mask_hit; 700 } 701 } 702 703 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) 704 { 705 return ovs_identifier_is_ufid(sfid) && 706 !(ufid_flags & OVS_UFID_F_OMIT_KEY); 707 } 708 709 static bool should_fill_mask(uint32_t ufid_flags) 710 { 711 return !(ufid_flags & OVS_UFID_F_OMIT_MASK); 712 } 713 714 static bool should_fill_actions(uint32_t ufid_flags) 715 { 716 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); 717 } 718 719 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, 720 const struct sw_flow_id *sfid, 721 uint32_t ufid_flags) 722 { 723 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); 724 725 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback 726 * see ovs_nla_put_identifier() 727 */ 728 if (sfid && ovs_identifier_is_ufid(sfid)) 729 len += nla_total_size(sfid->ufid_len); 730 else 731 len += nla_total_size(ovs_key_attr_size()); 732 733 /* OVS_FLOW_ATTR_KEY */ 734 if (!sfid || should_fill_key(sfid, ufid_flags)) 735 len += nla_total_size(ovs_key_attr_size()); 736 737 /* OVS_FLOW_ATTR_MASK */ 738 if (should_fill_mask(ufid_flags)) 739 len += nla_total_size(ovs_key_attr_size()); 740 741 /* OVS_FLOW_ATTR_ACTIONS */ 742 if (should_fill_actions(ufid_flags)) 743 len += nla_total_size(acts->orig_len); 744 745 return len 746 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 747 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 748 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */ 749 } 750 751 /* Called with ovs_mutex or RCU read lock. */ 752 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 753 struct sk_buff *skb) 754 { 755 struct ovs_flow_stats stats; 756 __be16 tcp_flags; 757 unsigned long used; 758 759 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 760 761 if (used && 762 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used), 763 OVS_FLOW_ATTR_PAD)) 764 return -EMSGSIZE; 765 766 if (stats.n_packets && 767 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS, 768 sizeof(struct ovs_flow_stats), &stats, 769 OVS_FLOW_ATTR_PAD)) 770 return -EMSGSIZE; 771 772 if ((u8)ntohs(tcp_flags) && 773 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 774 return -EMSGSIZE; 775 776 return 0; 777 } 778 779 /* Called with ovs_mutex or RCU read lock. */ 780 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 781 struct sk_buff *skb, int skb_orig_len) 782 { 783 struct nlattr *start; 784 int err; 785 786 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 787 * this is the first flow to be dumped into 'skb'. This is unusual for 788 * Netlink but individual action lists can be longer than 789 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 790 * The userspace caller can always fetch the actions separately if it 791 * really wants them. (Most userspace callers in fact don't care.) 792 * 793 * This can only fail for dump operations because the skb is always 794 * properly sized for single flows. 795 */ 796 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS); 797 if (start) { 798 const struct sw_flow_actions *sf_acts; 799 800 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 801 err = ovs_nla_put_actions(sf_acts->actions, 802 sf_acts->actions_len, skb); 803 804 if (!err) 805 nla_nest_end(skb, start); 806 else { 807 if (skb_orig_len) 808 return err; 809 810 nla_nest_cancel(skb, start); 811 } 812 } else if (skb_orig_len) { 813 return -EMSGSIZE; 814 } 815 816 return 0; 817 } 818 819 /* Called with ovs_mutex or RCU read lock. */ 820 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 821 struct sk_buff *skb, u32 portid, 822 u32 seq, u32 flags, u8 cmd, u32 ufid_flags) 823 { 824 const int skb_orig_len = skb->len; 825 struct ovs_header *ovs_header; 826 int err; 827 828 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 829 flags, cmd); 830 if (!ovs_header) 831 return -EMSGSIZE; 832 833 ovs_header->dp_ifindex = dp_ifindex; 834 835 err = ovs_nla_put_identifier(flow, skb); 836 if (err) 837 goto error; 838 839 if (should_fill_key(&flow->id, ufid_flags)) { 840 err = ovs_nla_put_masked_key(flow, skb); 841 if (err) 842 goto error; 843 } 844 845 if (should_fill_mask(ufid_flags)) { 846 err = ovs_nla_put_mask(flow, skb); 847 if (err) 848 goto error; 849 } 850 851 err = ovs_flow_cmd_fill_stats(flow, skb); 852 if (err) 853 goto error; 854 855 if (should_fill_actions(ufid_flags)) { 856 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 857 if (err) 858 goto error; 859 } 860 861 genlmsg_end(skb, ovs_header); 862 return 0; 863 864 error: 865 genlmsg_cancel(skb, ovs_header); 866 return err; 867 } 868 869 /* May not be called with RCU read lock. */ 870 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 871 const struct sw_flow_id *sfid, 872 struct genl_info *info, 873 bool always, 874 uint32_t ufid_flags) 875 { 876 struct sk_buff *skb; 877 size_t len; 878 879 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 880 return NULL; 881 882 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); 883 skb = genlmsg_new(len, GFP_KERNEL); 884 if (!skb) 885 return ERR_PTR(-ENOMEM); 886 887 return skb; 888 } 889 890 /* Called with ovs_mutex. */ 891 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 892 int dp_ifindex, 893 struct genl_info *info, u8 cmd, 894 bool always, u32 ufid_flags) 895 { 896 struct sk_buff *skb; 897 int retval; 898 899 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), 900 &flow->id, info, always, ufid_flags); 901 if (IS_ERR_OR_NULL(skb)) 902 return skb; 903 904 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 905 info->snd_portid, info->snd_seq, 0, 906 cmd, ufid_flags); 907 if (WARN_ON_ONCE(retval < 0)) { 908 kfree_skb(skb); 909 skb = ERR_PTR(retval); 910 } 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 if (WARN_ON_ONCE(err < 0)) { 1375 kfree_skb(reply); 1376 goto out_free; 1377 } 1378 1379 ovs_notify(&dp_flow_genl_family, reply, info); 1380 } else { 1381 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply)); 1382 } 1383 } 1384 1385 out_free: 1386 ovs_flow_free(flow, true); 1387 return 0; 1388 unlock: 1389 ovs_unlock(); 1390 return err; 1391 } 1392 1393 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1394 { 1395 struct nlattr *a[__OVS_FLOW_ATTR_MAX]; 1396 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1397 struct table_instance *ti; 1398 struct datapath *dp; 1399 u32 ufid_flags; 1400 int err; 1401 1402 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a, 1403 OVS_FLOW_ATTR_MAX, flow_policy, NULL); 1404 if (err) 1405 return err; 1406 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1407 1408 rcu_read_lock(); 1409 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1410 if (!dp) { 1411 rcu_read_unlock(); 1412 return -ENODEV; 1413 } 1414 1415 ti = rcu_dereference(dp->table.ti); 1416 for (;;) { 1417 struct sw_flow *flow; 1418 u32 bucket, obj; 1419 1420 bucket = cb->args[0]; 1421 obj = cb->args[1]; 1422 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1423 if (!flow) 1424 break; 1425 1426 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1427 NETLINK_CB(cb->skb).portid, 1428 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1429 OVS_FLOW_CMD_GET, ufid_flags) < 0) 1430 break; 1431 1432 cb->args[0] = bucket; 1433 cb->args[1] = obj; 1434 } 1435 rcu_read_unlock(); 1436 return skb->len; 1437 } 1438 1439 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1440 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1441 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1442 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1443 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1444 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1445 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, 1446 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, 1447 }; 1448 1449 static const struct genl_ops dp_flow_genl_ops[] = { 1450 { .cmd = OVS_FLOW_CMD_NEW, 1451 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1452 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1453 .doit = ovs_flow_cmd_new 1454 }, 1455 { .cmd = OVS_FLOW_CMD_DEL, 1456 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1457 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1458 .doit = ovs_flow_cmd_del 1459 }, 1460 { .cmd = OVS_FLOW_CMD_GET, 1461 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1462 .flags = 0, /* OK for unprivileged users. */ 1463 .doit = ovs_flow_cmd_get, 1464 .dumpit = ovs_flow_cmd_dump 1465 }, 1466 { .cmd = OVS_FLOW_CMD_SET, 1467 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1468 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1469 .doit = ovs_flow_cmd_set, 1470 }, 1471 }; 1472 1473 static struct genl_family dp_flow_genl_family __ro_after_init = { 1474 .hdrsize = sizeof(struct ovs_header), 1475 .name = OVS_FLOW_FAMILY, 1476 .version = OVS_FLOW_VERSION, 1477 .maxattr = OVS_FLOW_ATTR_MAX, 1478 .policy = flow_policy, 1479 .netnsok = true, 1480 .parallel_ops = true, 1481 .ops = dp_flow_genl_ops, 1482 .n_ops = ARRAY_SIZE(dp_flow_genl_ops), 1483 .mcgrps = &ovs_dp_flow_multicast_group, 1484 .n_mcgrps = 1, 1485 .module = THIS_MODULE, 1486 }; 1487 1488 static size_t ovs_dp_cmd_msg_size(void) 1489 { 1490 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1491 1492 msgsize += nla_total_size(IFNAMSIZ); 1493 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats)); 1494 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats)); 1495 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1496 1497 return msgsize; 1498 } 1499 1500 /* Called with ovs_mutex. */ 1501 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1502 u32 portid, u32 seq, u32 flags, u8 cmd) 1503 { 1504 struct ovs_header *ovs_header; 1505 struct ovs_dp_stats dp_stats; 1506 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1507 int err; 1508 1509 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1510 flags, cmd); 1511 if (!ovs_header) 1512 goto error; 1513 1514 ovs_header->dp_ifindex = get_dpifindex(dp); 1515 1516 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1517 if (err) 1518 goto nla_put_failure; 1519 1520 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1521 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1522 &dp_stats, OVS_DP_ATTR_PAD)) 1523 goto nla_put_failure; 1524 1525 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1526 sizeof(struct ovs_dp_megaflow_stats), 1527 &dp_megaflow_stats, OVS_DP_ATTR_PAD)) 1528 goto nla_put_failure; 1529 1530 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1531 goto nla_put_failure; 1532 1533 genlmsg_end(skb, ovs_header); 1534 return 0; 1535 1536 nla_put_failure: 1537 genlmsg_cancel(skb, ovs_header); 1538 error: 1539 return -EMSGSIZE; 1540 } 1541 1542 static struct sk_buff *ovs_dp_cmd_alloc_info(void) 1543 { 1544 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL); 1545 } 1546 1547 /* Called with rcu_read_lock or ovs_mutex. */ 1548 static struct datapath *lookup_datapath(struct net *net, 1549 const struct ovs_header *ovs_header, 1550 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1551 { 1552 struct datapath *dp; 1553 1554 if (!a[OVS_DP_ATTR_NAME]) 1555 dp = get_dp(net, ovs_header->dp_ifindex); 1556 else { 1557 struct vport *vport; 1558 1559 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1560 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1561 } 1562 return dp ? dp : ERR_PTR(-ENODEV); 1563 } 1564 1565 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info) 1566 { 1567 struct datapath *dp; 1568 1569 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1570 if (IS_ERR(dp)) 1571 return; 1572 1573 WARN(dp->user_features, "Dropping previously announced user features\n"); 1574 dp->user_features = 0; 1575 } 1576 1577 DEFINE_STATIC_KEY_FALSE(tc_recirc_sharing_support); 1578 1579 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1580 { 1581 u32 user_features = 0; 1582 1583 if (a[OVS_DP_ATTR_USER_FEATURES]) { 1584 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1585 1586 if (user_features & ~(OVS_DP_F_VPORT_PIDS | 1587 OVS_DP_F_UNALIGNED | 1588 OVS_DP_F_TC_RECIRC_SHARING)) 1589 return -EOPNOTSUPP; 1590 1591 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT) 1592 if (user_features & OVS_DP_F_TC_RECIRC_SHARING) 1593 return -EOPNOTSUPP; 1594 #endif 1595 } 1596 1597 dp->user_features = user_features; 1598 1599 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) 1600 static_branch_enable(&tc_recirc_sharing_support); 1601 else 1602 static_branch_disable(&tc_recirc_sharing_support); 1603 1604 return 0; 1605 } 1606 1607 static int ovs_dp_stats_init(struct datapath *dp) 1608 { 1609 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1610 if (!dp->stats_percpu) 1611 return -ENOMEM; 1612 1613 return 0; 1614 } 1615 1616 static int ovs_dp_vport_init(struct datapath *dp) 1617 { 1618 int i; 1619 1620 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS, 1621 sizeof(struct hlist_head), 1622 GFP_KERNEL); 1623 if (!dp->ports) 1624 return -ENOMEM; 1625 1626 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1627 INIT_HLIST_HEAD(&dp->ports[i]); 1628 1629 return 0; 1630 } 1631 1632 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1633 { 1634 struct nlattr **a = info->attrs; 1635 struct vport_parms parms; 1636 struct sk_buff *reply; 1637 struct datapath *dp; 1638 struct vport *vport; 1639 struct ovs_net *ovs_net; 1640 int err; 1641 1642 err = -EINVAL; 1643 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1644 goto err; 1645 1646 reply = ovs_dp_cmd_alloc_info(); 1647 if (!reply) 1648 return -ENOMEM; 1649 1650 err = -ENOMEM; 1651 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1652 if (dp == NULL) 1653 goto err_destroy_reply; 1654 1655 ovs_dp_set_net(dp, sock_net(skb->sk)); 1656 1657 /* Allocate table. */ 1658 err = ovs_flow_tbl_init(&dp->table); 1659 if (err) 1660 goto err_destroy_dp; 1661 1662 err = ovs_dp_stats_init(dp); 1663 if (err) 1664 goto err_destroy_table; 1665 1666 err = ovs_dp_vport_init(dp); 1667 if (err) 1668 goto err_destroy_stats; 1669 1670 err = ovs_meters_init(dp); 1671 if (err) 1672 goto err_destroy_ports; 1673 1674 /* Set up our datapath device. */ 1675 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1676 parms.type = OVS_VPORT_TYPE_INTERNAL; 1677 parms.options = NULL; 1678 parms.dp = dp; 1679 parms.port_no = OVSP_LOCAL; 1680 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1681 1682 err = ovs_dp_change(dp, a); 1683 if (err) 1684 goto err_destroy_meters; 1685 1686 /* So far only local changes have been made, now need the lock. */ 1687 ovs_lock(); 1688 1689 vport = new_vport(&parms); 1690 if (IS_ERR(vport)) { 1691 err = PTR_ERR(vport); 1692 if (err == -EBUSY) 1693 err = -EEXIST; 1694 1695 if (err == -EEXIST) { 1696 /* An outdated user space instance that does not understand 1697 * the concept of user_features has attempted to create a new 1698 * datapath and is likely to reuse it. Drop all user features. 1699 */ 1700 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1701 ovs_dp_reset_user_features(skb, info); 1702 } 1703 1704 ovs_unlock(); 1705 goto err_destroy_meters; 1706 } 1707 1708 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1709 info->snd_seq, 0, OVS_DP_CMD_NEW); 1710 BUG_ON(err < 0); 1711 1712 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1713 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1714 1715 ovs_unlock(); 1716 1717 ovs_notify(&dp_datapath_genl_family, reply, info); 1718 return 0; 1719 1720 err_destroy_meters: 1721 ovs_meters_exit(dp); 1722 err_destroy_ports: 1723 kfree(dp->ports); 1724 err_destroy_stats: 1725 free_percpu(dp->stats_percpu); 1726 err_destroy_table: 1727 ovs_flow_tbl_destroy(&dp->table); 1728 err_destroy_dp: 1729 kfree(dp); 1730 err_destroy_reply: 1731 kfree_skb(reply); 1732 err: 1733 return err; 1734 } 1735 1736 /* Called with ovs_mutex. */ 1737 static void __dp_destroy(struct datapath *dp) 1738 { 1739 int i; 1740 1741 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1742 struct vport *vport; 1743 struct hlist_node *n; 1744 1745 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1746 if (vport->port_no != OVSP_LOCAL) 1747 ovs_dp_detach_port(vport); 1748 } 1749 1750 list_del_rcu(&dp->list_node); 1751 1752 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1753 * all ports in datapath are destroyed first before freeing datapath. 1754 */ 1755 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1756 1757 /* RCU destroy the flow table */ 1758 call_rcu(&dp->rcu, destroy_dp_rcu); 1759 } 1760 1761 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1762 { 1763 struct sk_buff *reply; 1764 struct datapath *dp; 1765 int err; 1766 1767 reply = ovs_dp_cmd_alloc_info(); 1768 if (!reply) 1769 return -ENOMEM; 1770 1771 ovs_lock(); 1772 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1773 err = PTR_ERR(dp); 1774 if (IS_ERR(dp)) 1775 goto err_unlock_free; 1776 1777 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1778 info->snd_seq, 0, OVS_DP_CMD_DEL); 1779 BUG_ON(err < 0); 1780 1781 __dp_destroy(dp); 1782 ovs_unlock(); 1783 1784 ovs_notify(&dp_datapath_genl_family, reply, info); 1785 1786 return 0; 1787 1788 err_unlock_free: 1789 ovs_unlock(); 1790 kfree_skb(reply); 1791 return err; 1792 } 1793 1794 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1795 { 1796 struct sk_buff *reply; 1797 struct datapath *dp; 1798 int err; 1799 1800 reply = ovs_dp_cmd_alloc_info(); 1801 if (!reply) 1802 return -ENOMEM; 1803 1804 ovs_lock(); 1805 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1806 err = PTR_ERR(dp); 1807 if (IS_ERR(dp)) 1808 goto err_unlock_free; 1809 1810 err = ovs_dp_change(dp, info->attrs); 1811 if (err) 1812 goto err_unlock_free; 1813 1814 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1815 info->snd_seq, 0, OVS_DP_CMD_SET); 1816 BUG_ON(err < 0); 1817 1818 ovs_unlock(); 1819 ovs_notify(&dp_datapath_genl_family, reply, info); 1820 1821 return 0; 1822 1823 err_unlock_free: 1824 ovs_unlock(); 1825 kfree_skb(reply); 1826 return err; 1827 } 1828 1829 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1830 { 1831 struct sk_buff *reply; 1832 struct datapath *dp; 1833 int err; 1834 1835 reply = ovs_dp_cmd_alloc_info(); 1836 if (!reply) 1837 return -ENOMEM; 1838 1839 ovs_lock(); 1840 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1841 if (IS_ERR(dp)) { 1842 err = PTR_ERR(dp); 1843 goto err_unlock_free; 1844 } 1845 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1846 info->snd_seq, 0, OVS_DP_CMD_GET); 1847 BUG_ON(err < 0); 1848 ovs_unlock(); 1849 1850 return genlmsg_reply(reply, info); 1851 1852 err_unlock_free: 1853 ovs_unlock(); 1854 kfree_skb(reply); 1855 return err; 1856 } 1857 1858 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1859 { 1860 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1861 struct datapath *dp; 1862 int skip = cb->args[0]; 1863 int i = 0; 1864 1865 ovs_lock(); 1866 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1867 if (i >= skip && 1868 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1869 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1870 OVS_DP_CMD_GET) < 0) 1871 break; 1872 i++; 1873 } 1874 ovs_unlock(); 1875 1876 cb->args[0] = i; 1877 1878 return skb->len; 1879 } 1880 1881 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1882 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1883 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1884 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1885 }; 1886 1887 static const struct genl_ops dp_datapath_genl_ops[] = { 1888 { .cmd = OVS_DP_CMD_NEW, 1889 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1890 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1891 .doit = ovs_dp_cmd_new 1892 }, 1893 { .cmd = OVS_DP_CMD_DEL, 1894 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1895 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1896 .doit = ovs_dp_cmd_del 1897 }, 1898 { .cmd = OVS_DP_CMD_GET, 1899 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1900 .flags = 0, /* OK for unprivileged users. */ 1901 .doit = ovs_dp_cmd_get, 1902 .dumpit = ovs_dp_cmd_dump 1903 }, 1904 { .cmd = OVS_DP_CMD_SET, 1905 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1906 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1907 .doit = ovs_dp_cmd_set, 1908 }, 1909 }; 1910 1911 static struct genl_family dp_datapath_genl_family __ro_after_init = { 1912 .hdrsize = sizeof(struct ovs_header), 1913 .name = OVS_DATAPATH_FAMILY, 1914 .version = OVS_DATAPATH_VERSION, 1915 .maxattr = OVS_DP_ATTR_MAX, 1916 .policy = datapath_policy, 1917 .netnsok = true, 1918 .parallel_ops = true, 1919 .ops = dp_datapath_genl_ops, 1920 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops), 1921 .mcgrps = &ovs_dp_datapath_multicast_group, 1922 .n_mcgrps = 1, 1923 .module = THIS_MODULE, 1924 }; 1925 1926 /* Called with ovs_mutex or RCU read lock. */ 1927 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1928 struct net *net, u32 portid, u32 seq, 1929 u32 flags, u8 cmd, gfp_t gfp) 1930 { 1931 struct ovs_header *ovs_header; 1932 struct ovs_vport_stats vport_stats; 1933 int err; 1934 1935 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1936 flags, cmd); 1937 if (!ovs_header) 1938 return -EMSGSIZE; 1939 1940 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1941 1942 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1943 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1944 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 1945 ovs_vport_name(vport)) || 1946 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex)) 1947 goto nla_put_failure; 1948 1949 if (!net_eq(net, dev_net(vport->dev))) { 1950 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp); 1951 1952 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id)) 1953 goto nla_put_failure; 1954 } 1955 1956 ovs_vport_get_stats(vport, &vport_stats); 1957 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS, 1958 sizeof(struct ovs_vport_stats), &vport_stats, 1959 OVS_VPORT_ATTR_PAD)) 1960 goto nla_put_failure; 1961 1962 if (ovs_vport_get_upcall_portids(vport, skb)) 1963 goto nla_put_failure; 1964 1965 err = ovs_vport_get_options(vport, skb); 1966 if (err == -EMSGSIZE) 1967 goto error; 1968 1969 genlmsg_end(skb, ovs_header); 1970 return 0; 1971 1972 nla_put_failure: 1973 err = -EMSGSIZE; 1974 error: 1975 genlmsg_cancel(skb, ovs_header); 1976 return err; 1977 } 1978 1979 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 1980 { 1981 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1982 } 1983 1984 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 1985 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net, 1986 u32 portid, u32 seq, u8 cmd) 1987 { 1988 struct sk_buff *skb; 1989 int retval; 1990 1991 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1992 if (!skb) 1993 return ERR_PTR(-ENOMEM); 1994 1995 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd, 1996 GFP_KERNEL); 1997 BUG_ON(retval < 0); 1998 1999 return skb; 2000 } 2001 2002 /* Called with ovs_mutex or RCU read lock. */ 2003 static struct vport *lookup_vport(struct net *net, 2004 const struct ovs_header *ovs_header, 2005 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 2006 { 2007 struct datapath *dp; 2008 struct vport *vport; 2009 2010 if (a[OVS_VPORT_ATTR_IFINDEX]) 2011 return ERR_PTR(-EOPNOTSUPP); 2012 if (a[OVS_VPORT_ATTR_NAME]) { 2013 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 2014 if (!vport) 2015 return ERR_PTR(-ENODEV); 2016 if (ovs_header->dp_ifindex && 2017 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 2018 return ERR_PTR(-ENODEV); 2019 return vport; 2020 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 2021 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 2022 2023 if (port_no >= DP_MAX_PORTS) 2024 return ERR_PTR(-EFBIG); 2025 2026 dp = get_dp(net, ovs_header->dp_ifindex); 2027 if (!dp) 2028 return ERR_PTR(-ENODEV); 2029 2030 vport = ovs_vport_ovsl_rcu(dp, port_no); 2031 if (!vport) 2032 return ERR_PTR(-ENODEV); 2033 return vport; 2034 } else 2035 return ERR_PTR(-EINVAL); 2036 2037 } 2038 2039 static unsigned int ovs_get_max_headroom(struct datapath *dp) 2040 { 2041 unsigned int dev_headroom, max_headroom = 0; 2042 struct net_device *dev; 2043 struct vport *vport; 2044 int i; 2045 2046 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2047 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, 2048 lockdep_ovsl_is_held()) { 2049 dev = vport->dev; 2050 dev_headroom = netdev_get_fwd_headroom(dev); 2051 if (dev_headroom > max_headroom) 2052 max_headroom = dev_headroom; 2053 } 2054 } 2055 2056 return max_headroom; 2057 } 2058 2059 /* Called with ovs_mutex */ 2060 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom) 2061 { 2062 struct vport *vport; 2063 int i; 2064 2065 dp->max_headroom = new_headroom; 2066 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 2067 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, 2068 lockdep_ovsl_is_held()) 2069 netdev_set_rx_headroom(vport->dev, new_headroom); 2070 } 2071 2072 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 2073 { 2074 struct nlattr **a = info->attrs; 2075 struct ovs_header *ovs_header = info->userhdr; 2076 struct vport_parms parms; 2077 struct sk_buff *reply; 2078 struct vport *vport; 2079 struct datapath *dp; 2080 unsigned int new_headroom; 2081 u32 port_no; 2082 int err; 2083 2084 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 2085 !a[OVS_VPORT_ATTR_UPCALL_PID]) 2086 return -EINVAL; 2087 if (a[OVS_VPORT_ATTR_IFINDEX]) 2088 return -EOPNOTSUPP; 2089 2090 port_no = a[OVS_VPORT_ATTR_PORT_NO] 2091 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 2092 if (port_no >= DP_MAX_PORTS) 2093 return -EFBIG; 2094 2095 reply = ovs_vport_cmd_alloc_info(); 2096 if (!reply) 2097 return -ENOMEM; 2098 2099 ovs_lock(); 2100 restart: 2101 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 2102 err = -ENODEV; 2103 if (!dp) 2104 goto exit_unlock_free; 2105 2106 if (port_no) { 2107 vport = ovs_vport_ovsl(dp, port_no); 2108 err = -EBUSY; 2109 if (vport) 2110 goto exit_unlock_free; 2111 } else { 2112 for (port_no = 1; ; port_no++) { 2113 if (port_no >= DP_MAX_PORTS) { 2114 err = -EFBIG; 2115 goto exit_unlock_free; 2116 } 2117 vport = ovs_vport_ovsl(dp, port_no); 2118 if (!vport) 2119 break; 2120 } 2121 } 2122 2123 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 2124 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 2125 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 2126 parms.dp = dp; 2127 parms.port_no = port_no; 2128 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2129 2130 vport = new_vport(&parms); 2131 err = PTR_ERR(vport); 2132 if (IS_ERR(vport)) { 2133 if (err == -EAGAIN) 2134 goto restart; 2135 goto exit_unlock_free; 2136 } 2137 2138 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2139 info->snd_portid, info->snd_seq, 0, 2140 OVS_VPORT_CMD_NEW, GFP_KERNEL); 2141 2142 new_headroom = netdev_get_fwd_headroom(vport->dev); 2143 2144 if (new_headroom > dp->max_headroom) 2145 ovs_update_headroom(dp, new_headroom); 2146 else 2147 netdev_set_rx_headroom(vport->dev, dp->max_headroom); 2148 2149 BUG_ON(err < 0); 2150 ovs_unlock(); 2151 2152 ovs_notify(&dp_vport_genl_family, reply, info); 2153 return 0; 2154 2155 exit_unlock_free: 2156 ovs_unlock(); 2157 kfree_skb(reply); 2158 return err; 2159 } 2160 2161 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 2162 { 2163 struct nlattr **a = info->attrs; 2164 struct sk_buff *reply; 2165 struct vport *vport; 2166 int err; 2167 2168 reply = ovs_vport_cmd_alloc_info(); 2169 if (!reply) 2170 return -ENOMEM; 2171 2172 ovs_lock(); 2173 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2174 err = PTR_ERR(vport); 2175 if (IS_ERR(vport)) 2176 goto exit_unlock_free; 2177 2178 if (a[OVS_VPORT_ATTR_TYPE] && 2179 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 2180 err = -EINVAL; 2181 goto exit_unlock_free; 2182 } 2183 2184 if (a[OVS_VPORT_ATTR_OPTIONS]) { 2185 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 2186 if (err) 2187 goto exit_unlock_free; 2188 } 2189 2190 2191 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 2192 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2193 2194 err = ovs_vport_set_upcall_portids(vport, ids); 2195 if (err) 2196 goto exit_unlock_free; 2197 } 2198 2199 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2200 info->snd_portid, info->snd_seq, 0, 2201 OVS_VPORT_CMD_SET, GFP_KERNEL); 2202 BUG_ON(err < 0); 2203 2204 ovs_unlock(); 2205 ovs_notify(&dp_vport_genl_family, reply, info); 2206 return 0; 2207 2208 exit_unlock_free: 2209 ovs_unlock(); 2210 kfree_skb(reply); 2211 return err; 2212 } 2213 2214 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2215 { 2216 bool update_headroom = false; 2217 struct nlattr **a = info->attrs; 2218 struct sk_buff *reply; 2219 struct datapath *dp; 2220 struct vport *vport; 2221 unsigned int new_headroom; 2222 int err; 2223 2224 reply = ovs_vport_cmd_alloc_info(); 2225 if (!reply) 2226 return -ENOMEM; 2227 2228 ovs_lock(); 2229 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2230 err = PTR_ERR(vport); 2231 if (IS_ERR(vport)) 2232 goto exit_unlock_free; 2233 2234 if (vport->port_no == OVSP_LOCAL) { 2235 err = -EINVAL; 2236 goto exit_unlock_free; 2237 } 2238 2239 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2240 info->snd_portid, info->snd_seq, 0, 2241 OVS_VPORT_CMD_DEL, GFP_KERNEL); 2242 BUG_ON(err < 0); 2243 2244 /* the vport deletion may trigger dp headroom update */ 2245 dp = vport->dp; 2246 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom) 2247 update_headroom = true; 2248 2249 netdev_reset_rx_headroom(vport->dev); 2250 ovs_dp_detach_port(vport); 2251 2252 if (update_headroom) { 2253 new_headroom = ovs_get_max_headroom(dp); 2254 2255 if (new_headroom < dp->max_headroom) 2256 ovs_update_headroom(dp, new_headroom); 2257 } 2258 ovs_unlock(); 2259 2260 ovs_notify(&dp_vport_genl_family, reply, info); 2261 return 0; 2262 2263 exit_unlock_free: 2264 ovs_unlock(); 2265 kfree_skb(reply); 2266 return err; 2267 } 2268 2269 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2270 { 2271 struct nlattr **a = info->attrs; 2272 struct ovs_header *ovs_header = info->userhdr; 2273 struct sk_buff *reply; 2274 struct vport *vport; 2275 int err; 2276 2277 reply = ovs_vport_cmd_alloc_info(); 2278 if (!reply) 2279 return -ENOMEM; 2280 2281 rcu_read_lock(); 2282 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2283 err = PTR_ERR(vport); 2284 if (IS_ERR(vport)) 2285 goto exit_unlock_free; 2286 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2287 info->snd_portid, info->snd_seq, 0, 2288 OVS_VPORT_CMD_GET, GFP_ATOMIC); 2289 BUG_ON(err < 0); 2290 rcu_read_unlock(); 2291 2292 return genlmsg_reply(reply, info); 2293 2294 exit_unlock_free: 2295 rcu_read_unlock(); 2296 kfree_skb(reply); 2297 return err; 2298 } 2299 2300 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2301 { 2302 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2303 struct datapath *dp; 2304 int bucket = cb->args[0], skip = cb->args[1]; 2305 int i, j = 0; 2306 2307 rcu_read_lock(); 2308 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2309 if (!dp) { 2310 rcu_read_unlock(); 2311 return -ENODEV; 2312 } 2313 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2314 struct vport *vport; 2315 2316 j = 0; 2317 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2318 if (j >= skip && 2319 ovs_vport_cmd_fill_info(vport, skb, 2320 sock_net(skb->sk), 2321 NETLINK_CB(cb->skb).portid, 2322 cb->nlh->nlmsg_seq, 2323 NLM_F_MULTI, 2324 OVS_VPORT_CMD_GET, 2325 GFP_ATOMIC) < 0) 2326 goto out; 2327 2328 j++; 2329 } 2330 skip = 0; 2331 } 2332 out: 2333 rcu_read_unlock(); 2334 2335 cb->args[0] = i; 2336 cb->args[1] = j; 2337 2338 return skb->len; 2339 } 2340 2341 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2342 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2343 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2344 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2345 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2346 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC }, 2347 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2348 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 }, 2349 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 }, 2350 }; 2351 2352 static const struct genl_ops dp_vport_genl_ops[] = { 2353 { .cmd = OVS_VPORT_CMD_NEW, 2354 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2355 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2356 .doit = ovs_vport_cmd_new 2357 }, 2358 { .cmd = OVS_VPORT_CMD_DEL, 2359 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2360 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2361 .doit = ovs_vport_cmd_del 2362 }, 2363 { .cmd = OVS_VPORT_CMD_GET, 2364 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2365 .flags = 0, /* OK for unprivileged users. */ 2366 .doit = ovs_vport_cmd_get, 2367 .dumpit = ovs_vport_cmd_dump 2368 }, 2369 { .cmd = OVS_VPORT_CMD_SET, 2370 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2371 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2372 .doit = ovs_vport_cmd_set, 2373 }, 2374 }; 2375 2376 struct genl_family dp_vport_genl_family __ro_after_init = { 2377 .hdrsize = sizeof(struct ovs_header), 2378 .name = OVS_VPORT_FAMILY, 2379 .version = OVS_VPORT_VERSION, 2380 .maxattr = OVS_VPORT_ATTR_MAX, 2381 .policy = vport_policy, 2382 .netnsok = true, 2383 .parallel_ops = true, 2384 .ops = dp_vport_genl_ops, 2385 .n_ops = ARRAY_SIZE(dp_vport_genl_ops), 2386 .mcgrps = &ovs_dp_vport_multicast_group, 2387 .n_mcgrps = 1, 2388 .module = THIS_MODULE, 2389 }; 2390 2391 static struct genl_family * const dp_genl_families[] = { 2392 &dp_datapath_genl_family, 2393 &dp_vport_genl_family, 2394 &dp_flow_genl_family, 2395 &dp_packet_genl_family, 2396 &dp_meter_genl_family, 2397 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 2398 &dp_ct_limit_genl_family, 2399 #endif 2400 }; 2401 2402 static void dp_unregister_genl(int n_families) 2403 { 2404 int i; 2405 2406 for (i = 0; i < n_families; i++) 2407 genl_unregister_family(dp_genl_families[i]); 2408 } 2409 2410 static int __init dp_register_genl(void) 2411 { 2412 int err; 2413 int i; 2414 2415 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2416 2417 err = genl_register_family(dp_genl_families[i]); 2418 if (err) 2419 goto error; 2420 } 2421 2422 return 0; 2423 2424 error: 2425 dp_unregister_genl(i); 2426 return err; 2427 } 2428 2429 static int __net_init ovs_init_net(struct net *net) 2430 { 2431 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2432 2433 INIT_LIST_HEAD(&ovs_net->dps); 2434 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2435 return ovs_ct_init(net); 2436 } 2437 2438 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2439 struct list_head *head) 2440 { 2441 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2442 struct datapath *dp; 2443 2444 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2445 int i; 2446 2447 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2448 struct vport *vport; 2449 2450 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2451 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2452 continue; 2453 2454 if (dev_net(vport->dev) == dnet) 2455 list_add(&vport->detach_list, head); 2456 } 2457 } 2458 } 2459 } 2460 2461 static void __net_exit ovs_exit_net(struct net *dnet) 2462 { 2463 struct datapath *dp, *dp_next; 2464 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2465 struct vport *vport, *vport_next; 2466 struct net *net; 2467 LIST_HEAD(head); 2468 2469 ovs_lock(); 2470 2471 ovs_ct_exit(dnet); 2472 2473 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2474 __dp_destroy(dp); 2475 2476 down_read(&net_rwsem); 2477 for_each_net(net) 2478 list_vports_from_net(net, dnet, &head); 2479 up_read(&net_rwsem); 2480 2481 /* Detach all vports from given namespace. */ 2482 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2483 list_del(&vport->detach_list); 2484 ovs_dp_detach_port(vport); 2485 } 2486 2487 ovs_unlock(); 2488 2489 cancel_work_sync(&ovs_net->dp_notify_work); 2490 } 2491 2492 static struct pernet_operations ovs_net_ops = { 2493 .init = ovs_init_net, 2494 .exit = ovs_exit_net, 2495 .id = &ovs_net_id, 2496 .size = sizeof(struct ovs_net), 2497 }; 2498 2499 static int __init dp_init(void) 2500 { 2501 int err; 2502 2503 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof_field(struct sk_buff, cb)); 2504 2505 pr_info("Open vSwitch switching datapath\n"); 2506 2507 err = action_fifos_init(); 2508 if (err) 2509 goto error; 2510 2511 err = ovs_internal_dev_rtnl_link_register(); 2512 if (err) 2513 goto error_action_fifos_exit; 2514 2515 err = ovs_flow_init(); 2516 if (err) 2517 goto error_unreg_rtnl_link; 2518 2519 err = ovs_vport_init(); 2520 if (err) 2521 goto error_flow_exit; 2522 2523 err = register_pernet_device(&ovs_net_ops); 2524 if (err) 2525 goto error_vport_exit; 2526 2527 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2528 if (err) 2529 goto error_netns_exit; 2530 2531 err = ovs_netdev_init(); 2532 if (err) 2533 goto error_unreg_notifier; 2534 2535 err = dp_register_genl(); 2536 if (err < 0) 2537 goto error_unreg_netdev; 2538 2539 return 0; 2540 2541 error_unreg_netdev: 2542 ovs_netdev_exit(); 2543 error_unreg_notifier: 2544 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2545 error_netns_exit: 2546 unregister_pernet_device(&ovs_net_ops); 2547 error_vport_exit: 2548 ovs_vport_exit(); 2549 error_flow_exit: 2550 ovs_flow_exit(); 2551 error_unreg_rtnl_link: 2552 ovs_internal_dev_rtnl_link_unregister(); 2553 error_action_fifos_exit: 2554 action_fifos_exit(); 2555 error: 2556 return err; 2557 } 2558 2559 static void dp_cleanup(void) 2560 { 2561 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2562 ovs_netdev_exit(); 2563 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2564 unregister_pernet_device(&ovs_net_ops); 2565 rcu_barrier(); 2566 ovs_vport_exit(); 2567 ovs_flow_exit(); 2568 ovs_internal_dev_rtnl_link_unregister(); 2569 action_fifos_exit(); 2570 } 2571 2572 module_init(dp_init); 2573 module_exit(dp_cleanup); 2574 2575 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2576 MODULE_LICENSE("GPL"); 2577 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY); 2578 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY); 2579 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY); 2580 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY); 2581 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY); 2582 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY); 2583