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 static void ovs_dp_masks_rebalance(struct work_struct *work); 134 135 /* Must be called with rcu_read_lock or ovs_mutex. */ 136 const char *ovs_dp_name(const struct datapath *dp) 137 { 138 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); 139 return ovs_vport_name(vport); 140 } 141 142 static int get_dpifindex(const struct datapath *dp) 143 { 144 struct vport *local; 145 int ifindex; 146 147 rcu_read_lock(); 148 149 local = ovs_vport_rcu(dp, OVSP_LOCAL); 150 if (local) 151 ifindex = local->dev->ifindex; 152 else 153 ifindex = 0; 154 155 rcu_read_unlock(); 156 157 return ifindex; 158 } 159 160 static void destroy_dp_rcu(struct rcu_head *rcu) 161 { 162 struct datapath *dp = container_of(rcu, struct datapath, rcu); 163 164 ovs_flow_tbl_destroy(&dp->table); 165 free_percpu(dp->stats_percpu); 166 kfree(dp->ports); 167 ovs_meters_exit(dp); 168 kfree(dp); 169 } 170 171 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 172 u16 port_no) 173 { 174 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 175 } 176 177 /* Called with ovs_mutex or RCU read lock. */ 178 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 179 { 180 struct vport *vport; 181 struct hlist_head *head; 182 183 head = vport_hash_bucket(dp, port_no); 184 hlist_for_each_entry_rcu(vport, head, dp_hash_node, 185 lockdep_ovsl_is_held()) { 186 if (vport->port_no == port_no) 187 return vport; 188 } 189 return NULL; 190 } 191 192 /* Called with ovs_mutex. */ 193 static struct vport *new_vport(const struct vport_parms *parms) 194 { 195 struct vport *vport; 196 197 vport = ovs_vport_add(parms); 198 if (!IS_ERR(vport)) { 199 struct datapath *dp = parms->dp; 200 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 201 202 hlist_add_head_rcu(&vport->dp_hash_node, head); 203 } 204 return vport; 205 } 206 207 void ovs_dp_detach_port(struct vport *p) 208 { 209 ASSERT_OVSL(); 210 211 /* First drop references to device. */ 212 hlist_del_rcu(&p->dp_hash_node); 213 214 /* Then destroy it. */ 215 ovs_vport_del(p); 216 } 217 218 /* Must be called with rcu_read_lock. */ 219 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key) 220 { 221 const struct vport *p = OVS_CB(skb)->input_vport; 222 struct datapath *dp = p->dp; 223 struct sw_flow *flow; 224 struct sw_flow_actions *sf_acts; 225 struct dp_stats_percpu *stats; 226 u64 *stats_counter; 227 u32 n_mask_hit; 228 int error; 229 230 stats = this_cpu_ptr(dp->stats_percpu); 231 232 /* Look up flow. */ 233 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb), 234 &n_mask_hit); 235 if (unlikely(!flow)) { 236 struct dp_upcall_info upcall; 237 238 memset(&upcall, 0, sizeof(upcall)); 239 upcall.cmd = OVS_PACKET_CMD_MISS; 240 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 241 upcall.mru = OVS_CB(skb)->mru; 242 error = ovs_dp_upcall(dp, skb, key, &upcall, 0); 243 if (unlikely(error)) 244 kfree_skb(skb); 245 else 246 consume_skb(skb); 247 stats_counter = &stats->n_missed; 248 goto out; 249 } 250 251 ovs_flow_stats_update(flow, key->tp.flags, skb); 252 sf_acts = rcu_dereference(flow->sf_acts); 253 error = ovs_execute_actions(dp, skb, sf_acts, key); 254 if (unlikely(error)) 255 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n", 256 ovs_dp_name(dp), error); 257 258 stats_counter = &stats->n_hit; 259 260 out: 261 /* Update datapath statistics. */ 262 u64_stats_update_begin(&stats->syncp); 263 (*stats_counter)++; 264 stats->n_mask_hit += n_mask_hit; 265 u64_stats_update_end(&stats->syncp); 266 } 267 268 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 269 const struct sw_flow_key *key, 270 const struct dp_upcall_info *upcall_info, 271 uint32_t cutlen) 272 { 273 struct dp_stats_percpu *stats; 274 int err; 275 276 if (upcall_info->portid == 0) { 277 err = -ENOTCONN; 278 goto err; 279 } 280 281 if (!skb_is_gso(skb)) 282 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 283 else 284 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen); 285 if (err) 286 goto err; 287 288 return 0; 289 290 err: 291 stats = this_cpu_ptr(dp->stats_percpu); 292 293 u64_stats_update_begin(&stats->syncp); 294 stats->n_lost++; 295 u64_stats_update_end(&stats->syncp); 296 297 return err; 298 } 299 300 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 301 const struct sw_flow_key *key, 302 const struct dp_upcall_info *upcall_info, 303 uint32_t cutlen) 304 { 305 unsigned int gso_type = skb_shinfo(skb)->gso_type; 306 struct sw_flow_key later_key; 307 struct sk_buff *segs, *nskb; 308 int err; 309 310 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET); 311 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 312 if (IS_ERR(segs)) 313 return PTR_ERR(segs); 314 if (segs == NULL) 315 return -EINVAL; 316 317 if (gso_type & SKB_GSO_UDP) { 318 /* The initial flow key extracted by ovs_flow_key_extract() 319 * in this case is for a first fragment, so we need to 320 * properly mark later fragments. 321 */ 322 later_key = *key; 323 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 324 } 325 326 /* Queue all of the segments. */ 327 skb_list_walk_safe(segs, skb, nskb) { 328 if (gso_type & SKB_GSO_UDP && skb != segs) 329 key = &later_key; 330 331 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 332 if (err) 333 break; 334 335 } 336 337 /* Free all of the segments. */ 338 skb_list_walk_safe(segs, skb, nskb) { 339 if (err) 340 kfree_skb(skb); 341 else 342 consume_skb(skb); 343 } 344 return err; 345 } 346 347 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, 348 unsigned int hdrlen, int actions_attrlen) 349 { 350 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 351 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 352 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */ 353 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */ 354 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */ 355 356 /* OVS_PACKET_ATTR_USERDATA */ 357 if (upcall_info->userdata) 358 size += NLA_ALIGN(upcall_info->userdata->nla_len); 359 360 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ 361 if (upcall_info->egress_tun_info) 362 size += nla_total_size(ovs_tun_key_attr_size()); 363 364 /* OVS_PACKET_ATTR_ACTIONS */ 365 if (upcall_info->actions_len) 366 size += nla_total_size(actions_attrlen); 367 368 /* OVS_PACKET_ATTR_MRU */ 369 if (upcall_info->mru) 370 size += nla_total_size(sizeof(upcall_info->mru)); 371 372 return size; 373 } 374 375 static void pad_packet(struct datapath *dp, struct sk_buff *skb) 376 { 377 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 378 size_t plen = NLA_ALIGN(skb->len) - skb->len; 379 380 if (plen > 0) 381 skb_put_zero(skb, plen); 382 } 383 } 384 385 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 386 const struct sw_flow_key *key, 387 const struct dp_upcall_info *upcall_info, 388 uint32_t cutlen) 389 { 390 struct ovs_header *upcall; 391 struct sk_buff *nskb = NULL; 392 struct sk_buff *user_skb = NULL; /* to be queued to userspace */ 393 struct nlattr *nla; 394 size_t len; 395 unsigned int hlen; 396 int err, dp_ifindex; 397 u64 hash; 398 399 dp_ifindex = get_dpifindex(dp); 400 if (!dp_ifindex) 401 return -ENODEV; 402 403 if (skb_vlan_tag_present(skb)) { 404 nskb = skb_clone(skb, GFP_ATOMIC); 405 if (!nskb) 406 return -ENOMEM; 407 408 nskb = __vlan_hwaccel_push_inside(nskb); 409 if (!nskb) 410 return -ENOMEM; 411 412 skb = nskb; 413 } 414 415 if (nla_attr_size(skb->len) > USHRT_MAX) { 416 err = -EFBIG; 417 goto out; 418 } 419 420 /* Complete checksum if needed */ 421 if (skb->ip_summed == CHECKSUM_PARTIAL && 422 (err = skb_csum_hwoffload_help(skb, 0))) 423 goto out; 424 425 /* Older versions of OVS user space enforce alignment of the last 426 * Netlink attribute to NLA_ALIGNTO which would require extensive 427 * padding logic. Only perform zerocopy if padding is not required. 428 */ 429 if (dp->user_features & OVS_DP_F_UNALIGNED) 430 hlen = skb_zerocopy_headlen(skb); 431 else 432 hlen = skb->len; 433 434 len = upcall_msg_size(upcall_info, hlen - cutlen, 435 OVS_CB(skb)->acts_origlen); 436 user_skb = genlmsg_new(len, GFP_ATOMIC); 437 if (!user_skb) { 438 err = -ENOMEM; 439 goto out; 440 } 441 442 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 443 0, upcall_info->cmd); 444 if (!upcall) { 445 err = -EINVAL; 446 goto out; 447 } 448 upcall->dp_ifindex = dp_ifindex; 449 450 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); 451 if (err) 452 goto out; 453 454 if (upcall_info->userdata) 455 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 456 nla_len(upcall_info->userdata), 457 nla_data(upcall_info->userdata)); 458 459 if (upcall_info->egress_tun_info) { 460 nla = nla_nest_start_noflag(user_skb, 461 OVS_PACKET_ATTR_EGRESS_TUN_KEY); 462 if (!nla) { 463 err = -EMSGSIZE; 464 goto out; 465 } 466 err = ovs_nla_put_tunnel_info(user_skb, 467 upcall_info->egress_tun_info); 468 if (err) 469 goto out; 470 471 nla_nest_end(user_skb, nla); 472 } 473 474 if (upcall_info->actions_len) { 475 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS); 476 if (!nla) { 477 err = -EMSGSIZE; 478 goto out; 479 } 480 err = ovs_nla_put_actions(upcall_info->actions, 481 upcall_info->actions_len, 482 user_skb); 483 if (!err) 484 nla_nest_end(user_skb, nla); 485 else 486 nla_nest_cancel(user_skb, nla); 487 } 488 489 /* Add OVS_PACKET_ATTR_MRU */ 490 if (upcall_info->mru && 491 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) { 492 err = -ENOBUFS; 493 goto out; 494 } 495 496 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */ 497 if (cutlen > 0 && 498 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) { 499 err = -ENOBUFS; 500 goto out; 501 } 502 503 /* Add OVS_PACKET_ATTR_HASH */ 504 hash = skb_get_hash_raw(skb); 505 if (skb->sw_hash) 506 hash |= OVS_PACKET_HASH_SW_BIT; 507 508 if (skb->l4_hash) 509 hash |= OVS_PACKET_HASH_L4_BIT; 510 511 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) { 512 err = -ENOBUFS; 513 goto out; 514 } 515 516 /* Only reserve room for attribute header, packet data is added 517 * in skb_zerocopy() */ 518 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 519 err = -ENOBUFS; 520 goto out; 521 } 522 nla->nla_len = nla_attr_size(skb->len - cutlen); 523 524 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen); 525 if (err) 526 goto out; 527 528 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 529 pad_packet(dp, user_skb); 530 531 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 532 533 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 534 user_skb = NULL; 535 out: 536 if (err) 537 skb_tx_error(skb); 538 kfree_skb(user_skb); 539 kfree_skb(nskb); 540 return err; 541 } 542 543 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 544 { 545 struct ovs_header *ovs_header = info->userhdr; 546 struct net *net = sock_net(skb->sk); 547 struct nlattr **a = info->attrs; 548 struct sw_flow_actions *acts; 549 struct sk_buff *packet; 550 struct sw_flow *flow; 551 struct sw_flow_actions *sf_acts; 552 struct datapath *dp; 553 struct vport *input_vport; 554 u16 mru = 0; 555 u64 hash; 556 int len; 557 int err; 558 bool log = !a[OVS_PACKET_ATTR_PROBE]; 559 560 err = -EINVAL; 561 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 562 !a[OVS_PACKET_ATTR_ACTIONS]) 563 goto err; 564 565 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 566 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 567 err = -ENOMEM; 568 if (!packet) 569 goto err; 570 skb_reserve(packet, NET_IP_ALIGN); 571 572 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 573 574 /* Set packet's mru */ 575 if (a[OVS_PACKET_ATTR_MRU]) { 576 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]); 577 packet->ignore_df = 1; 578 } 579 OVS_CB(packet)->mru = mru; 580 581 if (a[OVS_PACKET_ATTR_HASH]) { 582 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]); 583 584 __skb_set_hash(packet, hash & 0xFFFFFFFFULL, 585 !!(hash & OVS_PACKET_HASH_SW_BIT), 586 !!(hash & OVS_PACKET_HASH_L4_BIT)); 587 } 588 589 /* Build an sw_flow for sending this packet. */ 590 flow = ovs_flow_alloc(); 591 err = PTR_ERR(flow); 592 if (IS_ERR(flow)) 593 goto err_kfree_skb; 594 595 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY], 596 packet, &flow->key, log); 597 if (err) 598 goto err_flow_free; 599 600 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS], 601 &flow->key, &acts, log); 602 if (err) 603 goto err_flow_free; 604 605 rcu_assign_pointer(flow->sf_acts, acts); 606 packet->priority = flow->key.phy.priority; 607 packet->mark = flow->key.phy.skb_mark; 608 609 rcu_read_lock(); 610 dp = get_dp_rcu(net, ovs_header->dp_ifindex); 611 err = -ENODEV; 612 if (!dp) 613 goto err_unlock; 614 615 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 616 if (!input_vport) 617 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 618 619 if (!input_vport) 620 goto err_unlock; 621 622 packet->dev = input_vport->dev; 623 OVS_CB(packet)->input_vport = input_vport; 624 sf_acts = rcu_dereference(flow->sf_acts); 625 626 local_bh_disable(); 627 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); 628 local_bh_enable(); 629 rcu_read_unlock(); 630 631 ovs_flow_free(flow, false); 632 return err; 633 634 err_unlock: 635 rcu_read_unlock(); 636 err_flow_free: 637 ovs_flow_free(flow, false); 638 err_kfree_skb: 639 kfree_skb(packet); 640 err: 641 return err; 642 } 643 644 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 645 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 646 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 647 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 648 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, 649 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, 650 [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 }, 651 }; 652 653 static const struct genl_ops dp_packet_genl_ops[] = { 654 { .cmd = OVS_PACKET_CMD_EXECUTE, 655 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 656 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 657 .doit = ovs_packet_cmd_execute 658 } 659 }; 660 661 static struct genl_family dp_packet_genl_family __ro_after_init = { 662 .hdrsize = sizeof(struct ovs_header), 663 .name = OVS_PACKET_FAMILY, 664 .version = OVS_PACKET_VERSION, 665 .maxattr = OVS_PACKET_ATTR_MAX, 666 .policy = packet_policy, 667 .netnsok = true, 668 .parallel_ops = true, 669 .ops = dp_packet_genl_ops, 670 .n_ops = ARRAY_SIZE(dp_packet_genl_ops), 671 .module = THIS_MODULE, 672 }; 673 674 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 675 struct ovs_dp_megaflow_stats *mega_stats) 676 { 677 int i; 678 679 memset(mega_stats, 0, sizeof(*mega_stats)); 680 681 stats->n_flows = ovs_flow_tbl_count(&dp->table); 682 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 683 684 stats->n_hit = stats->n_missed = stats->n_lost = 0; 685 686 for_each_possible_cpu(i) { 687 const struct dp_stats_percpu *percpu_stats; 688 struct dp_stats_percpu local_stats; 689 unsigned int start; 690 691 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 692 693 do { 694 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 695 local_stats = *percpu_stats; 696 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 697 698 stats->n_hit += local_stats.n_hit; 699 stats->n_missed += local_stats.n_missed; 700 stats->n_lost += local_stats.n_lost; 701 mega_stats->n_mask_hit += local_stats.n_mask_hit; 702 } 703 } 704 705 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) 706 { 707 return ovs_identifier_is_ufid(sfid) && 708 !(ufid_flags & OVS_UFID_F_OMIT_KEY); 709 } 710 711 static bool should_fill_mask(uint32_t ufid_flags) 712 { 713 return !(ufid_flags & OVS_UFID_F_OMIT_MASK); 714 } 715 716 static bool should_fill_actions(uint32_t ufid_flags) 717 { 718 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); 719 } 720 721 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, 722 const struct sw_flow_id *sfid, 723 uint32_t ufid_flags) 724 { 725 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); 726 727 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback 728 * see ovs_nla_put_identifier() 729 */ 730 if (sfid && ovs_identifier_is_ufid(sfid)) 731 len += nla_total_size(sfid->ufid_len); 732 else 733 len += nla_total_size(ovs_key_attr_size()); 734 735 /* OVS_FLOW_ATTR_KEY */ 736 if (!sfid || should_fill_key(sfid, ufid_flags)) 737 len += nla_total_size(ovs_key_attr_size()); 738 739 /* OVS_FLOW_ATTR_MASK */ 740 if (should_fill_mask(ufid_flags)) 741 len += nla_total_size(ovs_key_attr_size()); 742 743 /* OVS_FLOW_ATTR_ACTIONS */ 744 if (should_fill_actions(ufid_flags)) 745 len += nla_total_size(acts->orig_len); 746 747 return len 748 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 749 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 750 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */ 751 } 752 753 /* Called with ovs_mutex or RCU read lock. */ 754 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 755 struct sk_buff *skb) 756 { 757 struct ovs_flow_stats stats; 758 __be16 tcp_flags; 759 unsigned long used; 760 761 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 762 763 if (used && 764 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used), 765 OVS_FLOW_ATTR_PAD)) 766 return -EMSGSIZE; 767 768 if (stats.n_packets && 769 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS, 770 sizeof(struct ovs_flow_stats), &stats, 771 OVS_FLOW_ATTR_PAD)) 772 return -EMSGSIZE; 773 774 if ((u8)ntohs(tcp_flags) && 775 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 776 return -EMSGSIZE; 777 778 return 0; 779 } 780 781 /* Called with ovs_mutex or RCU read lock. */ 782 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 783 struct sk_buff *skb, int skb_orig_len) 784 { 785 struct nlattr *start; 786 int err; 787 788 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 789 * this is the first flow to be dumped into 'skb'. This is unusual for 790 * Netlink but individual action lists can be longer than 791 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 792 * The userspace caller can always fetch the actions separately if it 793 * really wants them. (Most userspace callers in fact don't care.) 794 * 795 * This can only fail for dump operations because the skb is always 796 * properly sized for single flows. 797 */ 798 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS); 799 if (start) { 800 const struct sw_flow_actions *sf_acts; 801 802 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 803 err = ovs_nla_put_actions(sf_acts->actions, 804 sf_acts->actions_len, skb); 805 806 if (!err) 807 nla_nest_end(skb, start); 808 else { 809 if (skb_orig_len) 810 return err; 811 812 nla_nest_cancel(skb, start); 813 } 814 } else if (skb_orig_len) { 815 return -EMSGSIZE; 816 } 817 818 return 0; 819 } 820 821 /* Called with ovs_mutex or RCU read lock. */ 822 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 823 struct sk_buff *skb, u32 portid, 824 u32 seq, u32 flags, u8 cmd, u32 ufid_flags) 825 { 826 const int skb_orig_len = skb->len; 827 struct ovs_header *ovs_header; 828 int err; 829 830 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 831 flags, cmd); 832 if (!ovs_header) 833 return -EMSGSIZE; 834 835 ovs_header->dp_ifindex = dp_ifindex; 836 837 err = ovs_nla_put_identifier(flow, skb); 838 if (err) 839 goto error; 840 841 if (should_fill_key(&flow->id, ufid_flags)) { 842 err = ovs_nla_put_masked_key(flow, skb); 843 if (err) 844 goto error; 845 } 846 847 if (should_fill_mask(ufid_flags)) { 848 err = ovs_nla_put_mask(flow, skb); 849 if (err) 850 goto error; 851 } 852 853 err = ovs_flow_cmd_fill_stats(flow, skb); 854 if (err) 855 goto error; 856 857 if (should_fill_actions(ufid_flags)) { 858 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 859 if (err) 860 goto error; 861 } 862 863 genlmsg_end(skb, ovs_header); 864 return 0; 865 866 error: 867 genlmsg_cancel(skb, ovs_header); 868 return err; 869 } 870 871 /* May not be called with RCU read lock. */ 872 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 873 const struct sw_flow_id *sfid, 874 struct genl_info *info, 875 bool always, 876 uint32_t ufid_flags) 877 { 878 struct sk_buff *skb; 879 size_t len; 880 881 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 882 return NULL; 883 884 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); 885 skb = genlmsg_new(len, GFP_KERNEL); 886 if (!skb) 887 return ERR_PTR(-ENOMEM); 888 889 return skb; 890 } 891 892 /* Called with ovs_mutex. */ 893 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 894 int dp_ifindex, 895 struct genl_info *info, u8 cmd, 896 bool always, u32 ufid_flags) 897 { 898 struct sk_buff *skb; 899 int retval; 900 901 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), 902 &flow->id, info, always, ufid_flags); 903 if (IS_ERR_OR_NULL(skb)) 904 return skb; 905 906 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 907 info->snd_portid, info->snd_seq, 0, 908 cmd, ufid_flags); 909 if (WARN_ON_ONCE(retval < 0)) { 910 kfree_skb(skb); 911 skb = ERR_PTR(retval); 912 } 913 return skb; 914 } 915 916 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 917 { 918 struct net *net = sock_net(skb->sk); 919 struct nlattr **a = info->attrs; 920 struct ovs_header *ovs_header = info->userhdr; 921 struct sw_flow *flow = NULL, *new_flow; 922 struct sw_flow_mask mask; 923 struct sk_buff *reply; 924 struct datapath *dp; 925 struct sw_flow_actions *acts; 926 struct sw_flow_match match; 927 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 928 int error; 929 bool log = !a[OVS_FLOW_ATTR_PROBE]; 930 931 /* Must have key and actions. */ 932 error = -EINVAL; 933 if (!a[OVS_FLOW_ATTR_KEY]) { 934 OVS_NLERR(log, "Flow key attr not present in new flow."); 935 goto error; 936 } 937 if (!a[OVS_FLOW_ATTR_ACTIONS]) { 938 OVS_NLERR(log, "Flow actions attr not present in new flow."); 939 goto error; 940 } 941 942 /* Most of the time we need to allocate a new flow, do it before 943 * locking. 944 */ 945 new_flow = ovs_flow_alloc(); 946 if (IS_ERR(new_flow)) { 947 error = PTR_ERR(new_flow); 948 goto error; 949 } 950 951 /* Extract key. */ 952 ovs_match_init(&match, &new_flow->key, false, &mask); 953 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 954 a[OVS_FLOW_ATTR_MASK], log); 955 if (error) 956 goto err_kfree_flow; 957 958 /* Extract flow identifier. */ 959 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID], 960 &new_flow->key, log); 961 if (error) 962 goto err_kfree_flow; 963 964 /* unmasked key is needed to match when ufid is not used. */ 965 if (ovs_identifier_is_key(&new_flow->id)) 966 match.key = new_flow->id.unmasked_key; 967 968 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask); 969 970 /* Validate actions. */ 971 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS], 972 &new_flow->key, &acts, log); 973 if (error) { 974 OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); 975 goto err_kfree_flow; 976 } 977 978 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false, 979 ufid_flags); 980 if (IS_ERR(reply)) { 981 error = PTR_ERR(reply); 982 goto err_kfree_acts; 983 } 984 985 ovs_lock(); 986 dp = get_dp(net, ovs_header->dp_ifindex); 987 if (unlikely(!dp)) { 988 error = -ENODEV; 989 goto err_unlock_ovs; 990 } 991 992 /* Check if this is a duplicate flow */ 993 if (ovs_identifier_is_ufid(&new_flow->id)) 994 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id); 995 if (!flow) 996 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key); 997 if (likely(!flow)) { 998 rcu_assign_pointer(new_flow->sf_acts, acts); 999 1000 /* Put flow in bucket. */ 1001 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 1002 if (unlikely(error)) { 1003 acts = NULL; 1004 goto err_unlock_ovs; 1005 } 1006 1007 if (unlikely(reply)) { 1008 error = ovs_flow_cmd_fill_info(new_flow, 1009 ovs_header->dp_ifindex, 1010 reply, info->snd_portid, 1011 info->snd_seq, 0, 1012 OVS_FLOW_CMD_NEW, 1013 ufid_flags); 1014 BUG_ON(error < 0); 1015 } 1016 ovs_unlock(); 1017 } else { 1018 struct sw_flow_actions *old_acts; 1019 1020 /* Bail out if we're not allowed to modify an existing flow. 1021 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 1022 * because Generic Netlink treats the latter as a dump 1023 * request. We also accept NLM_F_EXCL in case that bug ever 1024 * gets fixed. 1025 */ 1026 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 1027 | NLM_F_EXCL))) { 1028 error = -EEXIST; 1029 goto err_unlock_ovs; 1030 } 1031 /* The flow identifier has to be the same for flow updates. 1032 * Look for any overlapping flow. 1033 */ 1034 if (unlikely(!ovs_flow_cmp(flow, &match))) { 1035 if (ovs_identifier_is_key(&flow->id)) 1036 flow = ovs_flow_tbl_lookup_exact(&dp->table, 1037 &match); 1038 else /* UFID matches but key is different */ 1039 flow = NULL; 1040 if (!flow) { 1041 error = -ENOENT; 1042 goto err_unlock_ovs; 1043 } 1044 } 1045 /* Update actions. */ 1046 old_acts = ovsl_dereference(flow->sf_acts); 1047 rcu_assign_pointer(flow->sf_acts, acts); 1048 1049 if (unlikely(reply)) { 1050 error = ovs_flow_cmd_fill_info(flow, 1051 ovs_header->dp_ifindex, 1052 reply, info->snd_portid, 1053 info->snd_seq, 0, 1054 OVS_FLOW_CMD_NEW, 1055 ufid_flags); 1056 BUG_ON(error < 0); 1057 } 1058 ovs_unlock(); 1059 1060 ovs_nla_free_flow_actions_rcu(old_acts); 1061 ovs_flow_free(new_flow, false); 1062 } 1063 1064 if (reply) 1065 ovs_notify(&dp_flow_genl_family, reply, info); 1066 return 0; 1067 1068 err_unlock_ovs: 1069 ovs_unlock(); 1070 kfree_skb(reply); 1071 err_kfree_acts: 1072 ovs_nla_free_flow_actions(acts); 1073 err_kfree_flow: 1074 ovs_flow_free(new_flow, false); 1075 error: 1076 return error; 1077 } 1078 1079 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ 1080 static noinline_for_stack struct sw_flow_actions *get_flow_actions(struct net *net, 1081 const struct nlattr *a, 1082 const struct sw_flow_key *key, 1083 const struct sw_flow_mask *mask, 1084 bool log) 1085 { 1086 struct sw_flow_actions *acts; 1087 struct sw_flow_key masked_key; 1088 int error; 1089 1090 ovs_flow_mask_key(&masked_key, key, true, mask); 1091 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log); 1092 if (error) { 1093 OVS_NLERR(log, 1094 "Actions may not be safe on all matching packets"); 1095 return ERR_PTR(error); 1096 } 1097 1098 return acts; 1099 } 1100 1101 /* Factor out match-init and action-copy to avoid 1102 * "Wframe-larger-than=1024" warning. Because mask is only 1103 * used to get actions, we new a function to save some 1104 * stack space. 1105 * 1106 * If there are not key and action attrs, we return 0 1107 * directly. In the case, the caller will also not use the 1108 * match as before. If there is action attr, we try to get 1109 * actions and save them to *acts. Before returning from 1110 * the function, we reset the match->mask pointer. Because 1111 * we should not to return match object with dangling reference 1112 * to mask. 1113 * */ 1114 static noinline_for_stack int 1115 ovs_nla_init_match_and_action(struct net *net, 1116 struct sw_flow_match *match, 1117 struct sw_flow_key *key, 1118 struct nlattr **a, 1119 struct sw_flow_actions **acts, 1120 bool log) 1121 { 1122 struct sw_flow_mask mask; 1123 int error = 0; 1124 1125 if (a[OVS_FLOW_ATTR_KEY]) { 1126 ovs_match_init(match, key, true, &mask); 1127 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY], 1128 a[OVS_FLOW_ATTR_MASK], log); 1129 if (error) 1130 goto error; 1131 } 1132 1133 if (a[OVS_FLOW_ATTR_ACTIONS]) { 1134 if (!a[OVS_FLOW_ATTR_KEY]) { 1135 OVS_NLERR(log, 1136 "Flow key attribute not present in set flow."); 1137 error = -EINVAL; 1138 goto error; 1139 } 1140 1141 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key, 1142 &mask, log); 1143 if (IS_ERR(*acts)) { 1144 error = PTR_ERR(*acts); 1145 goto error; 1146 } 1147 } 1148 1149 /* On success, error is 0. */ 1150 error: 1151 match->mask = NULL; 1152 return error; 1153 } 1154 1155 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 1156 { 1157 struct net *net = sock_net(skb->sk); 1158 struct nlattr **a = info->attrs; 1159 struct ovs_header *ovs_header = info->userhdr; 1160 struct sw_flow_key key; 1161 struct sw_flow *flow; 1162 struct sk_buff *reply = NULL; 1163 struct datapath *dp; 1164 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 1165 struct sw_flow_match match; 1166 struct sw_flow_id sfid; 1167 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1168 int error = 0; 1169 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1170 bool ufid_present; 1171 1172 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); 1173 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) { 1174 OVS_NLERR(log, 1175 "Flow set message rejected, Key attribute missing."); 1176 return -EINVAL; 1177 } 1178 1179 error = ovs_nla_init_match_and_action(net, &match, &key, a, 1180 &acts, log); 1181 if (error) 1182 goto error; 1183 1184 if (acts) { 1185 /* Can allocate before locking if have acts. */ 1186 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false, 1187 ufid_flags); 1188 if (IS_ERR(reply)) { 1189 error = PTR_ERR(reply); 1190 goto err_kfree_acts; 1191 } 1192 } 1193 1194 ovs_lock(); 1195 dp = get_dp(net, ovs_header->dp_ifindex); 1196 if (unlikely(!dp)) { 1197 error = -ENODEV; 1198 goto err_unlock_ovs; 1199 } 1200 /* Check that the flow exists. */ 1201 if (ufid_present) 1202 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid); 1203 else 1204 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1205 if (unlikely(!flow)) { 1206 error = -ENOENT; 1207 goto err_unlock_ovs; 1208 } 1209 1210 /* Update actions, if present. */ 1211 if (likely(acts)) { 1212 old_acts = ovsl_dereference(flow->sf_acts); 1213 rcu_assign_pointer(flow->sf_acts, acts); 1214 1215 if (unlikely(reply)) { 1216 error = ovs_flow_cmd_fill_info(flow, 1217 ovs_header->dp_ifindex, 1218 reply, info->snd_portid, 1219 info->snd_seq, 0, 1220 OVS_FLOW_CMD_SET, 1221 ufid_flags); 1222 BUG_ON(error < 0); 1223 } 1224 } else { 1225 /* Could not alloc without acts before locking. */ 1226 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1227 info, OVS_FLOW_CMD_SET, false, 1228 ufid_flags); 1229 1230 if (IS_ERR(reply)) { 1231 error = PTR_ERR(reply); 1232 goto err_unlock_ovs; 1233 } 1234 } 1235 1236 /* Clear stats. */ 1237 if (a[OVS_FLOW_ATTR_CLEAR]) 1238 ovs_flow_stats_clear(flow); 1239 ovs_unlock(); 1240 1241 if (reply) 1242 ovs_notify(&dp_flow_genl_family, reply, info); 1243 if (old_acts) 1244 ovs_nla_free_flow_actions_rcu(old_acts); 1245 1246 return 0; 1247 1248 err_unlock_ovs: 1249 ovs_unlock(); 1250 kfree_skb(reply); 1251 err_kfree_acts: 1252 ovs_nla_free_flow_actions(acts); 1253 error: 1254 return error; 1255 } 1256 1257 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1258 { 1259 struct nlattr **a = info->attrs; 1260 struct ovs_header *ovs_header = info->userhdr; 1261 struct net *net = sock_net(skb->sk); 1262 struct sw_flow_key key; 1263 struct sk_buff *reply; 1264 struct sw_flow *flow; 1265 struct datapath *dp; 1266 struct sw_flow_match match; 1267 struct sw_flow_id ufid; 1268 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1269 int err = 0; 1270 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1271 bool ufid_present; 1272 1273 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1274 if (a[OVS_FLOW_ATTR_KEY]) { 1275 ovs_match_init(&match, &key, true, NULL); 1276 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL, 1277 log); 1278 } else if (!ufid_present) { 1279 OVS_NLERR(log, 1280 "Flow get message rejected, Key attribute missing."); 1281 err = -EINVAL; 1282 } 1283 if (err) 1284 return err; 1285 1286 ovs_lock(); 1287 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1288 if (!dp) { 1289 err = -ENODEV; 1290 goto unlock; 1291 } 1292 1293 if (ufid_present) 1294 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1295 else 1296 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1297 if (!flow) { 1298 err = -ENOENT; 1299 goto unlock; 1300 } 1301 1302 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1303 OVS_FLOW_CMD_GET, true, ufid_flags); 1304 if (IS_ERR(reply)) { 1305 err = PTR_ERR(reply); 1306 goto unlock; 1307 } 1308 1309 ovs_unlock(); 1310 return genlmsg_reply(reply, info); 1311 unlock: 1312 ovs_unlock(); 1313 return err; 1314 } 1315 1316 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1317 { 1318 struct nlattr **a = info->attrs; 1319 struct ovs_header *ovs_header = info->userhdr; 1320 struct net *net = sock_net(skb->sk); 1321 struct sw_flow_key key; 1322 struct sk_buff *reply; 1323 struct sw_flow *flow = NULL; 1324 struct datapath *dp; 1325 struct sw_flow_match match; 1326 struct sw_flow_id ufid; 1327 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1328 int err; 1329 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1330 bool ufid_present; 1331 1332 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1333 if (a[OVS_FLOW_ATTR_KEY]) { 1334 ovs_match_init(&match, &key, true, NULL); 1335 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1336 NULL, log); 1337 if (unlikely(err)) 1338 return err; 1339 } 1340 1341 ovs_lock(); 1342 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1343 if (unlikely(!dp)) { 1344 err = -ENODEV; 1345 goto unlock; 1346 } 1347 1348 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) { 1349 err = ovs_flow_tbl_flush(&dp->table); 1350 goto unlock; 1351 } 1352 1353 if (ufid_present) 1354 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1355 else 1356 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1357 if (unlikely(!flow)) { 1358 err = -ENOENT; 1359 goto unlock; 1360 } 1361 1362 ovs_flow_tbl_remove(&dp->table, flow); 1363 ovs_unlock(); 1364 1365 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1366 &flow->id, info, false, ufid_flags); 1367 if (likely(reply)) { 1368 if (!IS_ERR(reply)) { 1369 rcu_read_lock(); /*To keep RCU checker happy. */ 1370 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1371 reply, info->snd_portid, 1372 info->snd_seq, 0, 1373 OVS_FLOW_CMD_DEL, 1374 ufid_flags); 1375 rcu_read_unlock(); 1376 if (WARN_ON_ONCE(err < 0)) { 1377 kfree_skb(reply); 1378 goto out_free; 1379 } 1380 1381 ovs_notify(&dp_flow_genl_family, reply, info); 1382 } else { 1383 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply)); 1384 } 1385 } 1386 1387 out_free: 1388 ovs_flow_free(flow, true); 1389 return 0; 1390 unlock: 1391 ovs_unlock(); 1392 return err; 1393 } 1394 1395 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1396 { 1397 struct nlattr *a[__OVS_FLOW_ATTR_MAX]; 1398 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1399 struct table_instance *ti; 1400 struct datapath *dp; 1401 u32 ufid_flags; 1402 int err; 1403 1404 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a, 1405 OVS_FLOW_ATTR_MAX, flow_policy, NULL); 1406 if (err) 1407 return err; 1408 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1409 1410 rcu_read_lock(); 1411 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1412 if (!dp) { 1413 rcu_read_unlock(); 1414 return -ENODEV; 1415 } 1416 1417 ti = rcu_dereference(dp->table.ti); 1418 for (;;) { 1419 struct sw_flow *flow; 1420 u32 bucket, obj; 1421 1422 bucket = cb->args[0]; 1423 obj = cb->args[1]; 1424 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1425 if (!flow) 1426 break; 1427 1428 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1429 NETLINK_CB(cb->skb).portid, 1430 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1431 OVS_FLOW_CMD_GET, ufid_flags) < 0) 1432 break; 1433 1434 cb->args[0] = bucket; 1435 cb->args[1] = obj; 1436 } 1437 rcu_read_unlock(); 1438 return skb->len; 1439 } 1440 1441 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1442 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1443 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1444 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1445 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1446 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1447 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, 1448 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, 1449 }; 1450 1451 static const struct genl_ops dp_flow_genl_ops[] = { 1452 { .cmd = OVS_FLOW_CMD_NEW, 1453 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1454 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1455 .doit = ovs_flow_cmd_new 1456 }, 1457 { .cmd = OVS_FLOW_CMD_DEL, 1458 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1459 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1460 .doit = ovs_flow_cmd_del 1461 }, 1462 { .cmd = OVS_FLOW_CMD_GET, 1463 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1464 .flags = 0, /* OK for unprivileged users. */ 1465 .doit = ovs_flow_cmd_get, 1466 .dumpit = ovs_flow_cmd_dump 1467 }, 1468 { .cmd = OVS_FLOW_CMD_SET, 1469 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1470 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1471 .doit = ovs_flow_cmd_set, 1472 }, 1473 }; 1474 1475 static struct genl_family dp_flow_genl_family __ro_after_init = { 1476 .hdrsize = sizeof(struct ovs_header), 1477 .name = OVS_FLOW_FAMILY, 1478 .version = OVS_FLOW_VERSION, 1479 .maxattr = OVS_FLOW_ATTR_MAX, 1480 .policy = flow_policy, 1481 .netnsok = true, 1482 .parallel_ops = true, 1483 .ops = dp_flow_genl_ops, 1484 .n_ops = ARRAY_SIZE(dp_flow_genl_ops), 1485 .mcgrps = &ovs_dp_flow_multicast_group, 1486 .n_mcgrps = 1, 1487 .module = THIS_MODULE, 1488 }; 1489 1490 static size_t ovs_dp_cmd_msg_size(void) 1491 { 1492 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1493 1494 msgsize += nla_total_size(IFNAMSIZ); 1495 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats)); 1496 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats)); 1497 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1498 1499 return msgsize; 1500 } 1501 1502 /* Called with ovs_mutex. */ 1503 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1504 u32 portid, u32 seq, u32 flags, u8 cmd) 1505 { 1506 struct ovs_header *ovs_header; 1507 struct ovs_dp_stats dp_stats; 1508 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1509 int err; 1510 1511 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1512 flags, cmd); 1513 if (!ovs_header) 1514 goto error; 1515 1516 ovs_header->dp_ifindex = get_dpifindex(dp); 1517 1518 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1519 if (err) 1520 goto nla_put_failure; 1521 1522 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1523 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1524 &dp_stats, OVS_DP_ATTR_PAD)) 1525 goto nla_put_failure; 1526 1527 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1528 sizeof(struct ovs_dp_megaflow_stats), 1529 &dp_megaflow_stats, OVS_DP_ATTR_PAD)) 1530 goto nla_put_failure; 1531 1532 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1533 goto nla_put_failure; 1534 1535 genlmsg_end(skb, ovs_header); 1536 return 0; 1537 1538 nla_put_failure: 1539 genlmsg_cancel(skb, ovs_header); 1540 error: 1541 return -EMSGSIZE; 1542 } 1543 1544 static struct sk_buff *ovs_dp_cmd_alloc_info(void) 1545 { 1546 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL); 1547 } 1548 1549 /* Called with rcu_read_lock or ovs_mutex. */ 1550 static struct datapath *lookup_datapath(struct net *net, 1551 const struct ovs_header *ovs_header, 1552 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1553 { 1554 struct datapath *dp; 1555 1556 if (!a[OVS_DP_ATTR_NAME]) 1557 dp = get_dp(net, ovs_header->dp_ifindex); 1558 else { 1559 struct vport *vport; 1560 1561 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1562 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1563 } 1564 return dp ? dp : ERR_PTR(-ENODEV); 1565 } 1566 1567 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info) 1568 { 1569 struct datapath *dp; 1570 1571 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1572 if (IS_ERR(dp)) 1573 return; 1574 1575 WARN(dp->user_features, "Dropping previously announced user features\n"); 1576 dp->user_features = 0; 1577 } 1578 1579 DEFINE_STATIC_KEY_FALSE(tc_recirc_sharing_support); 1580 1581 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1582 { 1583 u32 user_features = 0; 1584 1585 if (a[OVS_DP_ATTR_USER_FEATURES]) { 1586 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1587 1588 if (user_features & ~(OVS_DP_F_VPORT_PIDS | 1589 OVS_DP_F_UNALIGNED | 1590 OVS_DP_F_TC_RECIRC_SHARING)) 1591 return -EOPNOTSUPP; 1592 1593 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT) 1594 if (user_features & OVS_DP_F_TC_RECIRC_SHARING) 1595 return -EOPNOTSUPP; 1596 #endif 1597 } 1598 1599 dp->user_features = user_features; 1600 1601 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) 1602 static_branch_enable(&tc_recirc_sharing_support); 1603 else 1604 static_branch_disable(&tc_recirc_sharing_support); 1605 1606 return 0; 1607 } 1608 1609 static int ovs_dp_stats_init(struct datapath *dp) 1610 { 1611 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1612 if (!dp->stats_percpu) 1613 return -ENOMEM; 1614 1615 return 0; 1616 } 1617 1618 static int ovs_dp_vport_init(struct datapath *dp) 1619 { 1620 int i; 1621 1622 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS, 1623 sizeof(struct hlist_head), 1624 GFP_KERNEL); 1625 if (!dp->ports) 1626 return -ENOMEM; 1627 1628 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1629 INIT_HLIST_HEAD(&dp->ports[i]); 1630 1631 return 0; 1632 } 1633 1634 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1635 { 1636 struct nlattr **a = info->attrs; 1637 struct vport_parms parms; 1638 struct sk_buff *reply; 1639 struct datapath *dp; 1640 struct vport *vport; 1641 struct ovs_net *ovs_net; 1642 int err; 1643 1644 err = -EINVAL; 1645 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1646 goto err; 1647 1648 reply = ovs_dp_cmd_alloc_info(); 1649 if (!reply) 1650 return -ENOMEM; 1651 1652 err = -ENOMEM; 1653 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1654 if (dp == NULL) 1655 goto err_destroy_reply; 1656 1657 ovs_dp_set_net(dp, sock_net(skb->sk)); 1658 INIT_DELAYED_WORK(&dp->masks_rebalance, ovs_dp_masks_rebalance); 1659 1660 /* Allocate table. */ 1661 err = ovs_flow_tbl_init(&dp->table); 1662 if (err) 1663 goto err_destroy_dp; 1664 1665 err = ovs_dp_stats_init(dp); 1666 if (err) 1667 goto err_destroy_table; 1668 1669 err = ovs_dp_vport_init(dp); 1670 if (err) 1671 goto err_destroy_stats; 1672 1673 err = ovs_meters_init(dp); 1674 if (err) 1675 goto err_destroy_ports; 1676 1677 /* Set up our datapath device. */ 1678 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1679 parms.type = OVS_VPORT_TYPE_INTERNAL; 1680 parms.options = NULL; 1681 parms.dp = dp; 1682 parms.port_no = OVSP_LOCAL; 1683 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1684 1685 err = ovs_dp_change(dp, a); 1686 if (err) 1687 goto err_destroy_meters; 1688 1689 /* So far only local changes have been made, now need the lock. */ 1690 ovs_lock(); 1691 1692 vport = new_vport(&parms); 1693 if (IS_ERR(vport)) { 1694 err = PTR_ERR(vport); 1695 if (err == -EBUSY) 1696 err = -EEXIST; 1697 1698 if (err == -EEXIST) { 1699 /* An outdated user space instance that does not understand 1700 * the concept of user_features has attempted to create a new 1701 * datapath and is likely to reuse it. Drop all user features. 1702 */ 1703 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1704 ovs_dp_reset_user_features(skb, info); 1705 } 1706 1707 ovs_unlock(); 1708 goto err_destroy_meters; 1709 } 1710 1711 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1712 info->snd_seq, 0, OVS_DP_CMD_NEW); 1713 BUG_ON(err < 0); 1714 1715 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1716 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1717 1718 schedule_delayed_work(&dp->masks_rebalance, 1719 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL)); 1720 1721 ovs_unlock(); 1722 1723 ovs_notify(&dp_datapath_genl_family, reply, info); 1724 return 0; 1725 1726 err_destroy_meters: 1727 ovs_meters_exit(dp); 1728 err_destroy_ports: 1729 kfree(dp->ports); 1730 err_destroy_stats: 1731 free_percpu(dp->stats_percpu); 1732 err_destroy_table: 1733 ovs_flow_tbl_destroy(&dp->table); 1734 err_destroy_dp: 1735 kfree(dp); 1736 err_destroy_reply: 1737 kfree_skb(reply); 1738 err: 1739 return err; 1740 } 1741 1742 /* Called with ovs_mutex. */ 1743 static void __dp_destroy(struct datapath *dp) 1744 { 1745 int i; 1746 1747 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1748 struct vport *vport; 1749 struct hlist_node *n; 1750 1751 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1752 if (vport->port_no != OVSP_LOCAL) 1753 ovs_dp_detach_port(vport); 1754 } 1755 1756 list_del_rcu(&dp->list_node); 1757 1758 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1759 * all ports in datapath are destroyed first before freeing datapath. 1760 */ 1761 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1762 1763 /* RCU destroy the flow table */ 1764 call_rcu(&dp->rcu, destroy_dp_rcu); 1765 1766 /* Cancel remaining work. */ 1767 cancel_delayed_work_sync(&dp->masks_rebalance); 1768 } 1769 1770 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1771 { 1772 struct sk_buff *reply; 1773 struct datapath *dp; 1774 int err; 1775 1776 reply = ovs_dp_cmd_alloc_info(); 1777 if (!reply) 1778 return -ENOMEM; 1779 1780 ovs_lock(); 1781 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1782 err = PTR_ERR(dp); 1783 if (IS_ERR(dp)) 1784 goto err_unlock_free; 1785 1786 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1787 info->snd_seq, 0, OVS_DP_CMD_DEL); 1788 BUG_ON(err < 0); 1789 1790 __dp_destroy(dp); 1791 ovs_unlock(); 1792 1793 ovs_notify(&dp_datapath_genl_family, reply, info); 1794 1795 return 0; 1796 1797 err_unlock_free: 1798 ovs_unlock(); 1799 kfree_skb(reply); 1800 return err; 1801 } 1802 1803 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1804 { 1805 struct sk_buff *reply; 1806 struct datapath *dp; 1807 int err; 1808 1809 reply = ovs_dp_cmd_alloc_info(); 1810 if (!reply) 1811 return -ENOMEM; 1812 1813 ovs_lock(); 1814 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1815 err = PTR_ERR(dp); 1816 if (IS_ERR(dp)) 1817 goto err_unlock_free; 1818 1819 err = ovs_dp_change(dp, info->attrs); 1820 if (err) 1821 goto err_unlock_free; 1822 1823 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1824 info->snd_seq, 0, OVS_DP_CMD_SET); 1825 BUG_ON(err < 0); 1826 1827 ovs_unlock(); 1828 ovs_notify(&dp_datapath_genl_family, reply, info); 1829 1830 return 0; 1831 1832 err_unlock_free: 1833 ovs_unlock(); 1834 kfree_skb(reply); 1835 return err; 1836 } 1837 1838 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1839 { 1840 struct sk_buff *reply; 1841 struct datapath *dp; 1842 int err; 1843 1844 reply = ovs_dp_cmd_alloc_info(); 1845 if (!reply) 1846 return -ENOMEM; 1847 1848 ovs_lock(); 1849 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1850 if (IS_ERR(dp)) { 1851 err = PTR_ERR(dp); 1852 goto err_unlock_free; 1853 } 1854 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1855 info->snd_seq, 0, OVS_DP_CMD_GET); 1856 BUG_ON(err < 0); 1857 ovs_unlock(); 1858 1859 return genlmsg_reply(reply, info); 1860 1861 err_unlock_free: 1862 ovs_unlock(); 1863 kfree_skb(reply); 1864 return err; 1865 } 1866 1867 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1868 { 1869 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1870 struct datapath *dp; 1871 int skip = cb->args[0]; 1872 int i = 0; 1873 1874 ovs_lock(); 1875 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1876 if (i >= skip && 1877 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1878 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1879 OVS_DP_CMD_GET) < 0) 1880 break; 1881 i++; 1882 } 1883 ovs_unlock(); 1884 1885 cb->args[0] = i; 1886 1887 return skb->len; 1888 } 1889 1890 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1891 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1892 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1893 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1894 }; 1895 1896 static const struct genl_ops dp_datapath_genl_ops[] = { 1897 { .cmd = OVS_DP_CMD_NEW, 1898 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1899 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1900 .doit = ovs_dp_cmd_new 1901 }, 1902 { .cmd = OVS_DP_CMD_DEL, 1903 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1904 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1905 .doit = ovs_dp_cmd_del 1906 }, 1907 { .cmd = OVS_DP_CMD_GET, 1908 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1909 .flags = 0, /* OK for unprivileged users. */ 1910 .doit = ovs_dp_cmd_get, 1911 .dumpit = ovs_dp_cmd_dump 1912 }, 1913 { .cmd = OVS_DP_CMD_SET, 1914 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1915 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1916 .doit = ovs_dp_cmd_set, 1917 }, 1918 }; 1919 1920 static struct genl_family dp_datapath_genl_family __ro_after_init = { 1921 .hdrsize = sizeof(struct ovs_header), 1922 .name = OVS_DATAPATH_FAMILY, 1923 .version = OVS_DATAPATH_VERSION, 1924 .maxattr = OVS_DP_ATTR_MAX, 1925 .policy = datapath_policy, 1926 .netnsok = true, 1927 .parallel_ops = true, 1928 .ops = dp_datapath_genl_ops, 1929 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops), 1930 .mcgrps = &ovs_dp_datapath_multicast_group, 1931 .n_mcgrps = 1, 1932 .module = THIS_MODULE, 1933 }; 1934 1935 /* Called with ovs_mutex or RCU read lock. */ 1936 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1937 struct net *net, u32 portid, u32 seq, 1938 u32 flags, u8 cmd, gfp_t gfp) 1939 { 1940 struct ovs_header *ovs_header; 1941 struct ovs_vport_stats vport_stats; 1942 int err; 1943 1944 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1945 flags, cmd); 1946 if (!ovs_header) 1947 return -EMSGSIZE; 1948 1949 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1950 1951 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1952 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1953 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 1954 ovs_vport_name(vport)) || 1955 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex)) 1956 goto nla_put_failure; 1957 1958 if (!net_eq(net, dev_net(vport->dev))) { 1959 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp); 1960 1961 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id)) 1962 goto nla_put_failure; 1963 } 1964 1965 ovs_vport_get_stats(vport, &vport_stats); 1966 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS, 1967 sizeof(struct ovs_vport_stats), &vport_stats, 1968 OVS_VPORT_ATTR_PAD)) 1969 goto nla_put_failure; 1970 1971 if (ovs_vport_get_upcall_portids(vport, skb)) 1972 goto nla_put_failure; 1973 1974 err = ovs_vport_get_options(vport, skb); 1975 if (err == -EMSGSIZE) 1976 goto error; 1977 1978 genlmsg_end(skb, ovs_header); 1979 return 0; 1980 1981 nla_put_failure: 1982 err = -EMSGSIZE; 1983 error: 1984 genlmsg_cancel(skb, ovs_header); 1985 return err; 1986 } 1987 1988 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 1989 { 1990 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1991 } 1992 1993 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 1994 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net, 1995 u32 portid, u32 seq, u8 cmd) 1996 { 1997 struct sk_buff *skb; 1998 int retval; 1999 2000 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2001 if (!skb) 2002 return ERR_PTR(-ENOMEM); 2003 2004 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd, 2005 GFP_KERNEL); 2006 BUG_ON(retval < 0); 2007 2008 return skb; 2009 } 2010 2011 /* Called with ovs_mutex or RCU read lock. */ 2012 static struct vport *lookup_vport(struct net *net, 2013 const struct ovs_header *ovs_header, 2014 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 2015 { 2016 struct datapath *dp; 2017 struct vport *vport; 2018 2019 if (a[OVS_VPORT_ATTR_IFINDEX]) 2020 return ERR_PTR(-EOPNOTSUPP); 2021 if (a[OVS_VPORT_ATTR_NAME]) { 2022 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 2023 if (!vport) 2024 return ERR_PTR(-ENODEV); 2025 if (ovs_header->dp_ifindex && 2026 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 2027 return ERR_PTR(-ENODEV); 2028 return vport; 2029 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 2030 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 2031 2032 if (port_no >= DP_MAX_PORTS) 2033 return ERR_PTR(-EFBIG); 2034 2035 dp = get_dp(net, ovs_header->dp_ifindex); 2036 if (!dp) 2037 return ERR_PTR(-ENODEV); 2038 2039 vport = ovs_vport_ovsl_rcu(dp, port_no); 2040 if (!vport) 2041 return ERR_PTR(-ENODEV); 2042 return vport; 2043 } else 2044 return ERR_PTR(-EINVAL); 2045 2046 } 2047 2048 static unsigned int ovs_get_max_headroom(struct datapath *dp) 2049 { 2050 unsigned int dev_headroom, max_headroom = 0; 2051 struct net_device *dev; 2052 struct vport *vport; 2053 int i; 2054 2055 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2056 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, 2057 lockdep_ovsl_is_held()) { 2058 dev = vport->dev; 2059 dev_headroom = netdev_get_fwd_headroom(dev); 2060 if (dev_headroom > max_headroom) 2061 max_headroom = dev_headroom; 2062 } 2063 } 2064 2065 return max_headroom; 2066 } 2067 2068 /* Called with ovs_mutex */ 2069 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom) 2070 { 2071 struct vport *vport; 2072 int i; 2073 2074 dp->max_headroom = new_headroom; 2075 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 2076 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, 2077 lockdep_ovsl_is_held()) 2078 netdev_set_rx_headroom(vport->dev, new_headroom); 2079 } 2080 2081 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 2082 { 2083 struct nlattr **a = info->attrs; 2084 struct ovs_header *ovs_header = info->userhdr; 2085 struct vport_parms parms; 2086 struct sk_buff *reply; 2087 struct vport *vport; 2088 struct datapath *dp; 2089 unsigned int new_headroom; 2090 u32 port_no; 2091 int err; 2092 2093 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 2094 !a[OVS_VPORT_ATTR_UPCALL_PID]) 2095 return -EINVAL; 2096 if (a[OVS_VPORT_ATTR_IFINDEX]) 2097 return -EOPNOTSUPP; 2098 2099 port_no = a[OVS_VPORT_ATTR_PORT_NO] 2100 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 2101 if (port_no >= DP_MAX_PORTS) 2102 return -EFBIG; 2103 2104 reply = ovs_vport_cmd_alloc_info(); 2105 if (!reply) 2106 return -ENOMEM; 2107 2108 ovs_lock(); 2109 restart: 2110 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 2111 err = -ENODEV; 2112 if (!dp) 2113 goto exit_unlock_free; 2114 2115 if (port_no) { 2116 vport = ovs_vport_ovsl(dp, port_no); 2117 err = -EBUSY; 2118 if (vport) 2119 goto exit_unlock_free; 2120 } else { 2121 for (port_no = 1; ; port_no++) { 2122 if (port_no >= DP_MAX_PORTS) { 2123 err = -EFBIG; 2124 goto exit_unlock_free; 2125 } 2126 vport = ovs_vport_ovsl(dp, port_no); 2127 if (!vport) 2128 break; 2129 } 2130 } 2131 2132 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 2133 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 2134 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 2135 parms.dp = dp; 2136 parms.port_no = port_no; 2137 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2138 2139 vport = new_vport(&parms); 2140 err = PTR_ERR(vport); 2141 if (IS_ERR(vport)) { 2142 if (err == -EAGAIN) 2143 goto restart; 2144 goto exit_unlock_free; 2145 } 2146 2147 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2148 info->snd_portid, info->snd_seq, 0, 2149 OVS_VPORT_CMD_NEW, GFP_KERNEL); 2150 2151 new_headroom = netdev_get_fwd_headroom(vport->dev); 2152 2153 if (new_headroom > dp->max_headroom) 2154 ovs_update_headroom(dp, new_headroom); 2155 else 2156 netdev_set_rx_headroom(vport->dev, dp->max_headroom); 2157 2158 BUG_ON(err < 0); 2159 ovs_unlock(); 2160 2161 ovs_notify(&dp_vport_genl_family, reply, info); 2162 return 0; 2163 2164 exit_unlock_free: 2165 ovs_unlock(); 2166 kfree_skb(reply); 2167 return err; 2168 } 2169 2170 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 2171 { 2172 struct nlattr **a = info->attrs; 2173 struct sk_buff *reply; 2174 struct vport *vport; 2175 int err; 2176 2177 reply = ovs_vport_cmd_alloc_info(); 2178 if (!reply) 2179 return -ENOMEM; 2180 2181 ovs_lock(); 2182 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2183 err = PTR_ERR(vport); 2184 if (IS_ERR(vport)) 2185 goto exit_unlock_free; 2186 2187 if (a[OVS_VPORT_ATTR_TYPE] && 2188 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 2189 err = -EINVAL; 2190 goto exit_unlock_free; 2191 } 2192 2193 if (a[OVS_VPORT_ATTR_OPTIONS]) { 2194 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 2195 if (err) 2196 goto exit_unlock_free; 2197 } 2198 2199 2200 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 2201 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2202 2203 err = ovs_vport_set_upcall_portids(vport, ids); 2204 if (err) 2205 goto exit_unlock_free; 2206 } 2207 2208 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2209 info->snd_portid, info->snd_seq, 0, 2210 OVS_VPORT_CMD_SET, GFP_KERNEL); 2211 BUG_ON(err < 0); 2212 2213 ovs_unlock(); 2214 ovs_notify(&dp_vport_genl_family, reply, info); 2215 return 0; 2216 2217 exit_unlock_free: 2218 ovs_unlock(); 2219 kfree_skb(reply); 2220 return err; 2221 } 2222 2223 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2224 { 2225 bool update_headroom = false; 2226 struct nlattr **a = info->attrs; 2227 struct sk_buff *reply; 2228 struct datapath *dp; 2229 struct vport *vport; 2230 unsigned int new_headroom; 2231 int err; 2232 2233 reply = ovs_vport_cmd_alloc_info(); 2234 if (!reply) 2235 return -ENOMEM; 2236 2237 ovs_lock(); 2238 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2239 err = PTR_ERR(vport); 2240 if (IS_ERR(vport)) 2241 goto exit_unlock_free; 2242 2243 if (vport->port_no == OVSP_LOCAL) { 2244 err = -EINVAL; 2245 goto exit_unlock_free; 2246 } 2247 2248 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2249 info->snd_portid, info->snd_seq, 0, 2250 OVS_VPORT_CMD_DEL, GFP_KERNEL); 2251 BUG_ON(err < 0); 2252 2253 /* the vport deletion may trigger dp headroom update */ 2254 dp = vport->dp; 2255 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom) 2256 update_headroom = true; 2257 2258 netdev_reset_rx_headroom(vport->dev); 2259 ovs_dp_detach_port(vport); 2260 2261 if (update_headroom) { 2262 new_headroom = ovs_get_max_headroom(dp); 2263 2264 if (new_headroom < dp->max_headroom) 2265 ovs_update_headroom(dp, new_headroom); 2266 } 2267 ovs_unlock(); 2268 2269 ovs_notify(&dp_vport_genl_family, reply, info); 2270 return 0; 2271 2272 exit_unlock_free: 2273 ovs_unlock(); 2274 kfree_skb(reply); 2275 return err; 2276 } 2277 2278 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2279 { 2280 struct nlattr **a = info->attrs; 2281 struct ovs_header *ovs_header = info->userhdr; 2282 struct sk_buff *reply; 2283 struct vport *vport; 2284 int err; 2285 2286 reply = ovs_vport_cmd_alloc_info(); 2287 if (!reply) 2288 return -ENOMEM; 2289 2290 rcu_read_lock(); 2291 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2292 err = PTR_ERR(vport); 2293 if (IS_ERR(vport)) 2294 goto exit_unlock_free; 2295 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2296 info->snd_portid, info->snd_seq, 0, 2297 OVS_VPORT_CMD_GET, GFP_ATOMIC); 2298 BUG_ON(err < 0); 2299 rcu_read_unlock(); 2300 2301 return genlmsg_reply(reply, info); 2302 2303 exit_unlock_free: 2304 rcu_read_unlock(); 2305 kfree_skb(reply); 2306 return err; 2307 } 2308 2309 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2310 { 2311 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2312 struct datapath *dp; 2313 int bucket = cb->args[0], skip = cb->args[1]; 2314 int i, j = 0; 2315 2316 rcu_read_lock(); 2317 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2318 if (!dp) { 2319 rcu_read_unlock(); 2320 return -ENODEV; 2321 } 2322 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2323 struct vport *vport; 2324 2325 j = 0; 2326 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2327 if (j >= skip && 2328 ovs_vport_cmd_fill_info(vport, skb, 2329 sock_net(skb->sk), 2330 NETLINK_CB(cb->skb).portid, 2331 cb->nlh->nlmsg_seq, 2332 NLM_F_MULTI, 2333 OVS_VPORT_CMD_GET, 2334 GFP_ATOMIC) < 0) 2335 goto out; 2336 2337 j++; 2338 } 2339 skip = 0; 2340 } 2341 out: 2342 rcu_read_unlock(); 2343 2344 cb->args[0] = i; 2345 cb->args[1] = j; 2346 2347 return skb->len; 2348 } 2349 2350 static void ovs_dp_masks_rebalance(struct work_struct *work) 2351 { 2352 struct datapath *dp = container_of(work, struct datapath, 2353 masks_rebalance.work); 2354 2355 ovs_lock(); 2356 ovs_flow_masks_rebalance(&dp->table); 2357 ovs_unlock(); 2358 2359 schedule_delayed_work(&dp->masks_rebalance, 2360 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL)); 2361 } 2362 2363 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2364 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2365 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2366 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2367 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2368 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC }, 2369 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2370 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 }, 2371 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 }, 2372 }; 2373 2374 static const struct genl_ops dp_vport_genl_ops[] = { 2375 { .cmd = OVS_VPORT_CMD_NEW, 2376 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2377 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2378 .doit = ovs_vport_cmd_new 2379 }, 2380 { .cmd = OVS_VPORT_CMD_DEL, 2381 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2382 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2383 .doit = ovs_vport_cmd_del 2384 }, 2385 { .cmd = OVS_VPORT_CMD_GET, 2386 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2387 .flags = 0, /* OK for unprivileged users. */ 2388 .doit = ovs_vport_cmd_get, 2389 .dumpit = ovs_vport_cmd_dump 2390 }, 2391 { .cmd = OVS_VPORT_CMD_SET, 2392 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2393 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2394 .doit = ovs_vport_cmd_set, 2395 }, 2396 }; 2397 2398 struct genl_family dp_vport_genl_family __ro_after_init = { 2399 .hdrsize = sizeof(struct ovs_header), 2400 .name = OVS_VPORT_FAMILY, 2401 .version = OVS_VPORT_VERSION, 2402 .maxattr = OVS_VPORT_ATTR_MAX, 2403 .policy = vport_policy, 2404 .netnsok = true, 2405 .parallel_ops = true, 2406 .ops = dp_vport_genl_ops, 2407 .n_ops = ARRAY_SIZE(dp_vport_genl_ops), 2408 .mcgrps = &ovs_dp_vport_multicast_group, 2409 .n_mcgrps = 1, 2410 .module = THIS_MODULE, 2411 }; 2412 2413 static struct genl_family * const dp_genl_families[] = { 2414 &dp_datapath_genl_family, 2415 &dp_vport_genl_family, 2416 &dp_flow_genl_family, 2417 &dp_packet_genl_family, 2418 &dp_meter_genl_family, 2419 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 2420 &dp_ct_limit_genl_family, 2421 #endif 2422 }; 2423 2424 static void dp_unregister_genl(int n_families) 2425 { 2426 int i; 2427 2428 for (i = 0; i < n_families; i++) 2429 genl_unregister_family(dp_genl_families[i]); 2430 } 2431 2432 static int __init dp_register_genl(void) 2433 { 2434 int err; 2435 int i; 2436 2437 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2438 2439 err = genl_register_family(dp_genl_families[i]); 2440 if (err) 2441 goto error; 2442 } 2443 2444 return 0; 2445 2446 error: 2447 dp_unregister_genl(i); 2448 return err; 2449 } 2450 2451 static int __net_init ovs_init_net(struct net *net) 2452 { 2453 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2454 2455 INIT_LIST_HEAD(&ovs_net->dps); 2456 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2457 return ovs_ct_init(net); 2458 } 2459 2460 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2461 struct list_head *head) 2462 { 2463 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2464 struct datapath *dp; 2465 2466 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2467 int i; 2468 2469 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2470 struct vport *vport; 2471 2472 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2473 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2474 continue; 2475 2476 if (dev_net(vport->dev) == dnet) 2477 list_add(&vport->detach_list, head); 2478 } 2479 } 2480 } 2481 } 2482 2483 static void __net_exit ovs_exit_net(struct net *dnet) 2484 { 2485 struct datapath *dp, *dp_next; 2486 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2487 struct vport *vport, *vport_next; 2488 struct net *net; 2489 LIST_HEAD(head); 2490 2491 ovs_lock(); 2492 2493 ovs_ct_exit(dnet); 2494 2495 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2496 __dp_destroy(dp); 2497 2498 down_read(&net_rwsem); 2499 for_each_net(net) 2500 list_vports_from_net(net, dnet, &head); 2501 up_read(&net_rwsem); 2502 2503 /* Detach all vports from given namespace. */ 2504 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2505 list_del(&vport->detach_list); 2506 ovs_dp_detach_port(vport); 2507 } 2508 2509 ovs_unlock(); 2510 2511 cancel_work_sync(&ovs_net->dp_notify_work); 2512 } 2513 2514 static struct pernet_operations ovs_net_ops = { 2515 .init = ovs_init_net, 2516 .exit = ovs_exit_net, 2517 .id = &ovs_net_id, 2518 .size = sizeof(struct ovs_net), 2519 }; 2520 2521 static int __init dp_init(void) 2522 { 2523 int err; 2524 2525 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof_field(struct sk_buff, cb)); 2526 2527 pr_info("Open vSwitch switching datapath\n"); 2528 2529 err = action_fifos_init(); 2530 if (err) 2531 goto error; 2532 2533 err = ovs_internal_dev_rtnl_link_register(); 2534 if (err) 2535 goto error_action_fifos_exit; 2536 2537 err = ovs_flow_init(); 2538 if (err) 2539 goto error_unreg_rtnl_link; 2540 2541 err = ovs_vport_init(); 2542 if (err) 2543 goto error_flow_exit; 2544 2545 err = register_pernet_device(&ovs_net_ops); 2546 if (err) 2547 goto error_vport_exit; 2548 2549 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2550 if (err) 2551 goto error_netns_exit; 2552 2553 err = ovs_netdev_init(); 2554 if (err) 2555 goto error_unreg_notifier; 2556 2557 err = dp_register_genl(); 2558 if (err < 0) 2559 goto error_unreg_netdev; 2560 2561 return 0; 2562 2563 error_unreg_netdev: 2564 ovs_netdev_exit(); 2565 error_unreg_notifier: 2566 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2567 error_netns_exit: 2568 unregister_pernet_device(&ovs_net_ops); 2569 error_vport_exit: 2570 ovs_vport_exit(); 2571 error_flow_exit: 2572 ovs_flow_exit(); 2573 error_unreg_rtnl_link: 2574 ovs_internal_dev_rtnl_link_unregister(); 2575 error_action_fifos_exit: 2576 action_fifos_exit(); 2577 error: 2578 return err; 2579 } 2580 2581 static void dp_cleanup(void) 2582 { 2583 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2584 ovs_netdev_exit(); 2585 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2586 unregister_pernet_device(&ovs_net_ops); 2587 rcu_barrier(); 2588 ovs_vport_exit(); 2589 ovs_flow_exit(); 2590 ovs_internal_dev_rtnl_link_unregister(); 2591 action_fifos_exit(); 2592 } 2593 2594 module_init(dp_init); 2595 module_exit(dp_cleanup); 2596 2597 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2598 MODULE_LICENSE("GPL"); 2599 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY); 2600 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY); 2601 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY); 2602 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY); 2603 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY); 2604 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY); 2605