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 u32 n_cache_hit; 229 int error; 230 231 stats = this_cpu_ptr(dp->stats_percpu); 232 233 /* Look up flow. */ 234 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb), 235 &n_mask_hit, &n_cache_hit); 236 if (unlikely(!flow)) { 237 struct dp_upcall_info upcall; 238 239 memset(&upcall, 0, sizeof(upcall)); 240 upcall.cmd = OVS_PACKET_CMD_MISS; 241 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 242 upcall.mru = OVS_CB(skb)->mru; 243 error = ovs_dp_upcall(dp, skb, key, &upcall, 0); 244 if (unlikely(error)) 245 kfree_skb(skb); 246 else 247 consume_skb(skb); 248 stats_counter = &stats->n_missed; 249 goto out; 250 } 251 252 ovs_flow_stats_update(flow, key->tp.flags, skb); 253 sf_acts = rcu_dereference(flow->sf_acts); 254 error = ovs_execute_actions(dp, skb, sf_acts, key); 255 if (unlikely(error)) 256 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n", 257 ovs_dp_name(dp), error); 258 259 stats_counter = &stats->n_hit; 260 261 out: 262 /* Update datapath statistics. */ 263 u64_stats_update_begin(&stats->syncp); 264 (*stats_counter)++; 265 stats->n_mask_hit += n_mask_hit; 266 stats->n_cache_hit += n_cache_hit; 267 u64_stats_update_end(&stats->syncp); 268 } 269 270 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 271 const struct sw_flow_key *key, 272 const struct dp_upcall_info *upcall_info, 273 uint32_t cutlen) 274 { 275 struct dp_stats_percpu *stats; 276 int err; 277 278 if (upcall_info->portid == 0) { 279 err = -ENOTCONN; 280 goto err; 281 } 282 283 if (!skb_is_gso(skb)) 284 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 285 else 286 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen); 287 if (err) 288 goto err; 289 290 return 0; 291 292 err: 293 stats = this_cpu_ptr(dp->stats_percpu); 294 295 u64_stats_update_begin(&stats->syncp); 296 stats->n_lost++; 297 u64_stats_update_end(&stats->syncp); 298 299 return err; 300 } 301 302 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 303 const struct sw_flow_key *key, 304 const struct dp_upcall_info *upcall_info, 305 uint32_t cutlen) 306 { 307 unsigned int gso_type = skb_shinfo(skb)->gso_type; 308 struct sw_flow_key later_key; 309 struct sk_buff *segs, *nskb; 310 int err; 311 312 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET); 313 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 314 if (IS_ERR(segs)) 315 return PTR_ERR(segs); 316 if (segs == NULL) 317 return -EINVAL; 318 319 if (gso_type & SKB_GSO_UDP) { 320 /* The initial flow key extracted by ovs_flow_key_extract() 321 * in this case is for a first fragment, so we need to 322 * properly mark later fragments. 323 */ 324 later_key = *key; 325 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 326 } 327 328 /* Queue all of the segments. */ 329 skb_list_walk_safe(segs, skb, nskb) { 330 if (gso_type & SKB_GSO_UDP && skb != segs) 331 key = &later_key; 332 333 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 334 if (err) 335 break; 336 337 } 338 339 /* Free all of the segments. */ 340 skb_list_walk_safe(segs, skb, nskb) { 341 if (err) 342 kfree_skb(skb); 343 else 344 consume_skb(skb); 345 } 346 return err; 347 } 348 349 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, 350 unsigned int hdrlen, int actions_attrlen) 351 { 352 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 353 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 354 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */ 355 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */ 356 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */ 357 358 /* OVS_PACKET_ATTR_USERDATA */ 359 if (upcall_info->userdata) 360 size += NLA_ALIGN(upcall_info->userdata->nla_len); 361 362 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ 363 if (upcall_info->egress_tun_info) 364 size += nla_total_size(ovs_tun_key_attr_size()); 365 366 /* OVS_PACKET_ATTR_ACTIONS */ 367 if (upcall_info->actions_len) 368 size += nla_total_size(actions_attrlen); 369 370 /* OVS_PACKET_ATTR_MRU */ 371 if (upcall_info->mru) 372 size += nla_total_size(sizeof(upcall_info->mru)); 373 374 return size; 375 } 376 377 static void pad_packet(struct datapath *dp, struct sk_buff *skb) 378 { 379 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 380 size_t plen = NLA_ALIGN(skb->len) - skb->len; 381 382 if (plen > 0) 383 skb_put_zero(skb, plen); 384 } 385 } 386 387 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 388 const struct sw_flow_key *key, 389 const struct dp_upcall_info *upcall_info, 390 uint32_t cutlen) 391 { 392 struct ovs_header *upcall; 393 struct sk_buff *nskb = NULL; 394 struct sk_buff *user_skb = NULL; /* to be queued to userspace */ 395 struct nlattr *nla; 396 size_t len; 397 unsigned int hlen; 398 int err, dp_ifindex; 399 u64 hash; 400 401 dp_ifindex = get_dpifindex(dp); 402 if (!dp_ifindex) 403 return -ENODEV; 404 405 if (skb_vlan_tag_present(skb)) { 406 nskb = skb_clone(skb, GFP_ATOMIC); 407 if (!nskb) 408 return -ENOMEM; 409 410 nskb = __vlan_hwaccel_push_inside(nskb); 411 if (!nskb) 412 return -ENOMEM; 413 414 skb = nskb; 415 } 416 417 if (nla_attr_size(skb->len) > USHRT_MAX) { 418 err = -EFBIG; 419 goto out; 420 } 421 422 /* Complete checksum if needed */ 423 if (skb->ip_summed == CHECKSUM_PARTIAL && 424 (err = skb_csum_hwoffload_help(skb, 0))) 425 goto out; 426 427 /* Older versions of OVS user space enforce alignment of the last 428 * Netlink attribute to NLA_ALIGNTO which would require extensive 429 * padding logic. Only perform zerocopy if padding is not required. 430 */ 431 if (dp->user_features & OVS_DP_F_UNALIGNED) 432 hlen = skb_zerocopy_headlen(skb); 433 else 434 hlen = skb->len; 435 436 len = upcall_msg_size(upcall_info, hlen - cutlen, 437 OVS_CB(skb)->acts_origlen); 438 user_skb = genlmsg_new(len, GFP_ATOMIC); 439 if (!user_skb) { 440 err = -ENOMEM; 441 goto out; 442 } 443 444 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 445 0, upcall_info->cmd); 446 if (!upcall) { 447 err = -EINVAL; 448 goto out; 449 } 450 upcall->dp_ifindex = dp_ifindex; 451 452 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); 453 if (err) 454 goto out; 455 456 if (upcall_info->userdata) 457 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 458 nla_len(upcall_info->userdata), 459 nla_data(upcall_info->userdata)); 460 461 if (upcall_info->egress_tun_info) { 462 nla = nla_nest_start_noflag(user_skb, 463 OVS_PACKET_ATTR_EGRESS_TUN_KEY); 464 if (!nla) { 465 err = -EMSGSIZE; 466 goto out; 467 } 468 err = ovs_nla_put_tunnel_info(user_skb, 469 upcall_info->egress_tun_info); 470 if (err) 471 goto out; 472 473 nla_nest_end(user_skb, nla); 474 } 475 476 if (upcall_info->actions_len) { 477 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS); 478 if (!nla) { 479 err = -EMSGSIZE; 480 goto out; 481 } 482 err = ovs_nla_put_actions(upcall_info->actions, 483 upcall_info->actions_len, 484 user_skb); 485 if (!err) 486 nla_nest_end(user_skb, nla); 487 else 488 nla_nest_cancel(user_skb, nla); 489 } 490 491 /* Add OVS_PACKET_ATTR_MRU */ 492 if (upcall_info->mru && 493 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) { 494 err = -ENOBUFS; 495 goto out; 496 } 497 498 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */ 499 if (cutlen > 0 && 500 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) { 501 err = -ENOBUFS; 502 goto out; 503 } 504 505 /* Add OVS_PACKET_ATTR_HASH */ 506 hash = skb_get_hash_raw(skb); 507 if (skb->sw_hash) 508 hash |= OVS_PACKET_HASH_SW_BIT; 509 510 if (skb->l4_hash) 511 hash |= OVS_PACKET_HASH_L4_BIT; 512 513 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) { 514 err = -ENOBUFS; 515 goto out; 516 } 517 518 /* Only reserve room for attribute header, packet data is added 519 * in skb_zerocopy() */ 520 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 521 err = -ENOBUFS; 522 goto out; 523 } 524 nla->nla_len = nla_attr_size(skb->len - cutlen); 525 526 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen); 527 if (err) 528 goto out; 529 530 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 531 pad_packet(dp, user_skb); 532 533 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 534 535 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 536 user_skb = NULL; 537 out: 538 if (err) 539 skb_tx_error(skb); 540 kfree_skb(user_skb); 541 kfree_skb(nskb); 542 return err; 543 } 544 545 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 546 { 547 struct ovs_header *ovs_header = info->userhdr; 548 struct net *net = sock_net(skb->sk); 549 struct nlattr **a = info->attrs; 550 struct sw_flow_actions *acts; 551 struct sk_buff *packet; 552 struct sw_flow *flow; 553 struct sw_flow_actions *sf_acts; 554 struct datapath *dp; 555 struct vport *input_vport; 556 u16 mru = 0; 557 u64 hash; 558 int len; 559 int err; 560 bool log = !a[OVS_PACKET_ATTR_PROBE]; 561 562 err = -EINVAL; 563 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 564 !a[OVS_PACKET_ATTR_ACTIONS]) 565 goto err; 566 567 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 568 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 569 err = -ENOMEM; 570 if (!packet) 571 goto err; 572 skb_reserve(packet, NET_IP_ALIGN); 573 574 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 575 576 /* Set packet's mru */ 577 if (a[OVS_PACKET_ATTR_MRU]) { 578 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]); 579 packet->ignore_df = 1; 580 } 581 OVS_CB(packet)->mru = mru; 582 583 if (a[OVS_PACKET_ATTR_HASH]) { 584 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]); 585 586 __skb_set_hash(packet, hash & 0xFFFFFFFFULL, 587 !!(hash & OVS_PACKET_HASH_SW_BIT), 588 !!(hash & OVS_PACKET_HASH_L4_BIT)); 589 } 590 591 /* Build an sw_flow for sending this packet. */ 592 flow = ovs_flow_alloc(); 593 err = PTR_ERR(flow); 594 if (IS_ERR(flow)) 595 goto err_kfree_skb; 596 597 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY], 598 packet, &flow->key, log); 599 if (err) 600 goto err_flow_free; 601 602 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS], 603 &flow->key, &acts, log); 604 if (err) 605 goto err_flow_free; 606 607 rcu_assign_pointer(flow->sf_acts, acts); 608 packet->priority = flow->key.phy.priority; 609 packet->mark = flow->key.phy.skb_mark; 610 611 rcu_read_lock(); 612 dp = get_dp_rcu(net, ovs_header->dp_ifindex); 613 err = -ENODEV; 614 if (!dp) 615 goto err_unlock; 616 617 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 618 if (!input_vport) 619 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 620 621 if (!input_vport) 622 goto err_unlock; 623 624 packet->dev = input_vport->dev; 625 OVS_CB(packet)->input_vport = input_vport; 626 sf_acts = rcu_dereference(flow->sf_acts); 627 628 local_bh_disable(); 629 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); 630 local_bh_enable(); 631 rcu_read_unlock(); 632 633 ovs_flow_free(flow, false); 634 return err; 635 636 err_unlock: 637 rcu_read_unlock(); 638 err_flow_free: 639 ovs_flow_free(flow, false); 640 err_kfree_skb: 641 kfree_skb(packet); 642 err: 643 return err; 644 } 645 646 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 647 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 648 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 649 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 650 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, 651 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, 652 [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 }, 653 }; 654 655 static const struct genl_ops dp_packet_genl_ops[] = { 656 { .cmd = OVS_PACKET_CMD_EXECUTE, 657 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 658 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 659 .doit = ovs_packet_cmd_execute 660 } 661 }; 662 663 static struct genl_family dp_packet_genl_family __ro_after_init = { 664 .hdrsize = sizeof(struct ovs_header), 665 .name = OVS_PACKET_FAMILY, 666 .version = OVS_PACKET_VERSION, 667 .maxattr = OVS_PACKET_ATTR_MAX, 668 .policy = packet_policy, 669 .netnsok = true, 670 .parallel_ops = true, 671 .ops = dp_packet_genl_ops, 672 .n_ops = ARRAY_SIZE(dp_packet_genl_ops), 673 .module = THIS_MODULE, 674 }; 675 676 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 677 struct ovs_dp_megaflow_stats *mega_stats) 678 { 679 int i; 680 681 memset(mega_stats, 0, sizeof(*mega_stats)); 682 683 stats->n_flows = ovs_flow_tbl_count(&dp->table); 684 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 685 686 stats->n_hit = stats->n_missed = stats->n_lost = 0; 687 688 for_each_possible_cpu(i) { 689 const struct dp_stats_percpu *percpu_stats; 690 struct dp_stats_percpu local_stats; 691 unsigned int start; 692 693 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 694 695 do { 696 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 697 local_stats = *percpu_stats; 698 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 699 700 stats->n_hit += local_stats.n_hit; 701 stats->n_missed += local_stats.n_missed; 702 stats->n_lost += local_stats.n_lost; 703 mega_stats->n_mask_hit += local_stats.n_mask_hit; 704 mega_stats->n_cache_hit += local_stats.n_cache_hit; 705 } 706 } 707 708 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) 709 { 710 return ovs_identifier_is_ufid(sfid) && 711 !(ufid_flags & OVS_UFID_F_OMIT_KEY); 712 } 713 714 static bool should_fill_mask(uint32_t ufid_flags) 715 { 716 return !(ufid_flags & OVS_UFID_F_OMIT_MASK); 717 } 718 719 static bool should_fill_actions(uint32_t ufid_flags) 720 { 721 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); 722 } 723 724 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, 725 const struct sw_flow_id *sfid, 726 uint32_t ufid_flags) 727 { 728 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); 729 730 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback 731 * see ovs_nla_put_identifier() 732 */ 733 if (sfid && ovs_identifier_is_ufid(sfid)) 734 len += nla_total_size(sfid->ufid_len); 735 else 736 len += nla_total_size(ovs_key_attr_size()); 737 738 /* OVS_FLOW_ATTR_KEY */ 739 if (!sfid || should_fill_key(sfid, ufid_flags)) 740 len += nla_total_size(ovs_key_attr_size()); 741 742 /* OVS_FLOW_ATTR_MASK */ 743 if (should_fill_mask(ufid_flags)) 744 len += nla_total_size(ovs_key_attr_size()); 745 746 /* OVS_FLOW_ATTR_ACTIONS */ 747 if (should_fill_actions(ufid_flags)) 748 len += nla_total_size(acts->orig_len); 749 750 return len 751 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 752 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 753 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */ 754 } 755 756 /* Called with ovs_mutex or RCU read lock. */ 757 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 758 struct sk_buff *skb) 759 { 760 struct ovs_flow_stats stats; 761 __be16 tcp_flags; 762 unsigned long used; 763 764 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 765 766 if (used && 767 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used), 768 OVS_FLOW_ATTR_PAD)) 769 return -EMSGSIZE; 770 771 if (stats.n_packets && 772 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS, 773 sizeof(struct ovs_flow_stats), &stats, 774 OVS_FLOW_ATTR_PAD)) 775 return -EMSGSIZE; 776 777 if ((u8)ntohs(tcp_flags) && 778 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 779 return -EMSGSIZE; 780 781 return 0; 782 } 783 784 /* Called with ovs_mutex or RCU read lock. */ 785 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 786 struct sk_buff *skb, int skb_orig_len) 787 { 788 struct nlattr *start; 789 int err; 790 791 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 792 * this is the first flow to be dumped into 'skb'. This is unusual for 793 * Netlink but individual action lists can be longer than 794 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 795 * The userspace caller can always fetch the actions separately if it 796 * really wants them. (Most userspace callers in fact don't care.) 797 * 798 * This can only fail for dump operations because the skb is always 799 * properly sized for single flows. 800 */ 801 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS); 802 if (start) { 803 const struct sw_flow_actions *sf_acts; 804 805 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 806 err = ovs_nla_put_actions(sf_acts->actions, 807 sf_acts->actions_len, skb); 808 809 if (!err) 810 nla_nest_end(skb, start); 811 else { 812 if (skb_orig_len) 813 return err; 814 815 nla_nest_cancel(skb, start); 816 } 817 } else if (skb_orig_len) { 818 return -EMSGSIZE; 819 } 820 821 return 0; 822 } 823 824 /* Called with ovs_mutex or RCU read lock. */ 825 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 826 struct sk_buff *skb, u32 portid, 827 u32 seq, u32 flags, u8 cmd, u32 ufid_flags) 828 { 829 const int skb_orig_len = skb->len; 830 struct ovs_header *ovs_header; 831 int err; 832 833 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 834 flags, cmd); 835 if (!ovs_header) 836 return -EMSGSIZE; 837 838 ovs_header->dp_ifindex = dp_ifindex; 839 840 err = ovs_nla_put_identifier(flow, skb); 841 if (err) 842 goto error; 843 844 if (should_fill_key(&flow->id, ufid_flags)) { 845 err = ovs_nla_put_masked_key(flow, skb); 846 if (err) 847 goto error; 848 } 849 850 if (should_fill_mask(ufid_flags)) { 851 err = ovs_nla_put_mask(flow, skb); 852 if (err) 853 goto error; 854 } 855 856 err = ovs_flow_cmd_fill_stats(flow, skb); 857 if (err) 858 goto error; 859 860 if (should_fill_actions(ufid_flags)) { 861 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 862 if (err) 863 goto error; 864 } 865 866 genlmsg_end(skb, ovs_header); 867 return 0; 868 869 error: 870 genlmsg_cancel(skb, ovs_header); 871 return err; 872 } 873 874 /* May not be called with RCU read lock. */ 875 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 876 const struct sw_flow_id *sfid, 877 struct genl_info *info, 878 bool always, 879 uint32_t ufid_flags) 880 { 881 struct sk_buff *skb; 882 size_t len; 883 884 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 885 return NULL; 886 887 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); 888 skb = genlmsg_new(len, GFP_KERNEL); 889 if (!skb) 890 return ERR_PTR(-ENOMEM); 891 892 return skb; 893 } 894 895 /* Called with ovs_mutex. */ 896 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 897 int dp_ifindex, 898 struct genl_info *info, u8 cmd, 899 bool always, u32 ufid_flags) 900 { 901 struct sk_buff *skb; 902 int retval; 903 904 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), 905 &flow->id, info, always, ufid_flags); 906 if (IS_ERR_OR_NULL(skb)) 907 return skb; 908 909 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 910 info->snd_portid, info->snd_seq, 0, 911 cmd, ufid_flags); 912 if (WARN_ON_ONCE(retval < 0)) { 913 kfree_skb(skb); 914 skb = ERR_PTR(retval); 915 } 916 return skb; 917 } 918 919 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 920 { 921 struct net *net = sock_net(skb->sk); 922 struct nlattr **a = info->attrs; 923 struct ovs_header *ovs_header = info->userhdr; 924 struct sw_flow *flow = NULL, *new_flow; 925 struct sw_flow_mask mask; 926 struct sk_buff *reply; 927 struct datapath *dp; 928 struct sw_flow_actions *acts; 929 struct sw_flow_match match; 930 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 931 int error; 932 bool log = !a[OVS_FLOW_ATTR_PROBE]; 933 934 /* Must have key and actions. */ 935 error = -EINVAL; 936 if (!a[OVS_FLOW_ATTR_KEY]) { 937 OVS_NLERR(log, "Flow key attr not present in new flow."); 938 goto error; 939 } 940 if (!a[OVS_FLOW_ATTR_ACTIONS]) { 941 OVS_NLERR(log, "Flow actions attr not present in new flow."); 942 goto error; 943 } 944 945 /* Most of the time we need to allocate a new flow, do it before 946 * locking. 947 */ 948 new_flow = ovs_flow_alloc(); 949 if (IS_ERR(new_flow)) { 950 error = PTR_ERR(new_flow); 951 goto error; 952 } 953 954 /* Extract key. */ 955 ovs_match_init(&match, &new_flow->key, false, &mask); 956 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 957 a[OVS_FLOW_ATTR_MASK], log); 958 if (error) 959 goto err_kfree_flow; 960 961 /* Extract flow identifier. */ 962 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID], 963 &new_flow->key, log); 964 if (error) 965 goto err_kfree_flow; 966 967 /* unmasked key is needed to match when ufid is not used. */ 968 if (ovs_identifier_is_key(&new_flow->id)) 969 match.key = new_flow->id.unmasked_key; 970 971 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask); 972 973 /* Validate actions. */ 974 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS], 975 &new_flow->key, &acts, log); 976 if (error) { 977 OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); 978 goto err_kfree_flow; 979 } 980 981 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false, 982 ufid_flags); 983 if (IS_ERR(reply)) { 984 error = PTR_ERR(reply); 985 goto err_kfree_acts; 986 } 987 988 ovs_lock(); 989 dp = get_dp(net, ovs_header->dp_ifindex); 990 if (unlikely(!dp)) { 991 error = -ENODEV; 992 goto err_unlock_ovs; 993 } 994 995 /* Check if this is a duplicate flow */ 996 if (ovs_identifier_is_ufid(&new_flow->id)) 997 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id); 998 if (!flow) 999 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key); 1000 if (likely(!flow)) { 1001 rcu_assign_pointer(new_flow->sf_acts, acts); 1002 1003 /* Put flow in bucket. */ 1004 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 1005 if (unlikely(error)) { 1006 acts = NULL; 1007 goto err_unlock_ovs; 1008 } 1009 1010 if (unlikely(reply)) { 1011 error = ovs_flow_cmd_fill_info(new_flow, 1012 ovs_header->dp_ifindex, 1013 reply, info->snd_portid, 1014 info->snd_seq, 0, 1015 OVS_FLOW_CMD_NEW, 1016 ufid_flags); 1017 BUG_ON(error < 0); 1018 } 1019 ovs_unlock(); 1020 } else { 1021 struct sw_flow_actions *old_acts; 1022 1023 /* Bail out if we're not allowed to modify an existing flow. 1024 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 1025 * because Generic Netlink treats the latter as a dump 1026 * request. We also accept NLM_F_EXCL in case that bug ever 1027 * gets fixed. 1028 */ 1029 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 1030 | NLM_F_EXCL))) { 1031 error = -EEXIST; 1032 goto err_unlock_ovs; 1033 } 1034 /* The flow identifier has to be the same for flow updates. 1035 * Look for any overlapping flow. 1036 */ 1037 if (unlikely(!ovs_flow_cmp(flow, &match))) { 1038 if (ovs_identifier_is_key(&flow->id)) 1039 flow = ovs_flow_tbl_lookup_exact(&dp->table, 1040 &match); 1041 else /* UFID matches but key is different */ 1042 flow = NULL; 1043 if (!flow) { 1044 error = -ENOENT; 1045 goto err_unlock_ovs; 1046 } 1047 } 1048 /* Update actions. */ 1049 old_acts = ovsl_dereference(flow->sf_acts); 1050 rcu_assign_pointer(flow->sf_acts, acts); 1051 1052 if (unlikely(reply)) { 1053 error = ovs_flow_cmd_fill_info(flow, 1054 ovs_header->dp_ifindex, 1055 reply, info->snd_portid, 1056 info->snd_seq, 0, 1057 OVS_FLOW_CMD_NEW, 1058 ufid_flags); 1059 BUG_ON(error < 0); 1060 } 1061 ovs_unlock(); 1062 1063 ovs_nla_free_flow_actions_rcu(old_acts); 1064 ovs_flow_free(new_flow, false); 1065 } 1066 1067 if (reply) 1068 ovs_notify(&dp_flow_genl_family, reply, info); 1069 return 0; 1070 1071 err_unlock_ovs: 1072 ovs_unlock(); 1073 kfree_skb(reply); 1074 err_kfree_acts: 1075 ovs_nla_free_flow_actions(acts); 1076 err_kfree_flow: 1077 ovs_flow_free(new_flow, false); 1078 error: 1079 return error; 1080 } 1081 1082 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ 1083 static noinline_for_stack struct sw_flow_actions *get_flow_actions(struct net *net, 1084 const struct nlattr *a, 1085 const struct sw_flow_key *key, 1086 const struct sw_flow_mask *mask, 1087 bool log) 1088 { 1089 struct sw_flow_actions *acts; 1090 struct sw_flow_key masked_key; 1091 int error; 1092 1093 ovs_flow_mask_key(&masked_key, key, true, mask); 1094 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log); 1095 if (error) { 1096 OVS_NLERR(log, 1097 "Actions may not be safe on all matching packets"); 1098 return ERR_PTR(error); 1099 } 1100 1101 return acts; 1102 } 1103 1104 /* Factor out match-init and action-copy to avoid 1105 * "Wframe-larger-than=1024" warning. Because mask is only 1106 * used to get actions, we new a function to save some 1107 * stack space. 1108 * 1109 * If there are not key and action attrs, we return 0 1110 * directly. In the case, the caller will also not use the 1111 * match as before. If there is action attr, we try to get 1112 * actions and save them to *acts. Before returning from 1113 * the function, we reset the match->mask pointer. Because 1114 * we should not to return match object with dangling reference 1115 * to mask. 1116 * */ 1117 static noinline_for_stack int 1118 ovs_nla_init_match_and_action(struct net *net, 1119 struct sw_flow_match *match, 1120 struct sw_flow_key *key, 1121 struct nlattr **a, 1122 struct sw_flow_actions **acts, 1123 bool log) 1124 { 1125 struct sw_flow_mask mask; 1126 int error = 0; 1127 1128 if (a[OVS_FLOW_ATTR_KEY]) { 1129 ovs_match_init(match, key, true, &mask); 1130 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY], 1131 a[OVS_FLOW_ATTR_MASK], log); 1132 if (error) 1133 goto error; 1134 } 1135 1136 if (a[OVS_FLOW_ATTR_ACTIONS]) { 1137 if (!a[OVS_FLOW_ATTR_KEY]) { 1138 OVS_NLERR(log, 1139 "Flow key attribute not present in set flow."); 1140 error = -EINVAL; 1141 goto error; 1142 } 1143 1144 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key, 1145 &mask, log); 1146 if (IS_ERR(*acts)) { 1147 error = PTR_ERR(*acts); 1148 goto error; 1149 } 1150 } 1151 1152 /* On success, error is 0. */ 1153 error: 1154 match->mask = NULL; 1155 return error; 1156 } 1157 1158 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 1159 { 1160 struct net *net = sock_net(skb->sk); 1161 struct nlattr **a = info->attrs; 1162 struct ovs_header *ovs_header = info->userhdr; 1163 struct sw_flow_key key; 1164 struct sw_flow *flow; 1165 struct sk_buff *reply = NULL; 1166 struct datapath *dp; 1167 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 1168 struct sw_flow_match match; 1169 struct sw_flow_id sfid; 1170 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1171 int error = 0; 1172 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1173 bool ufid_present; 1174 1175 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); 1176 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) { 1177 OVS_NLERR(log, 1178 "Flow set message rejected, Key attribute missing."); 1179 return -EINVAL; 1180 } 1181 1182 error = ovs_nla_init_match_and_action(net, &match, &key, a, 1183 &acts, log); 1184 if (error) 1185 goto error; 1186 1187 if (acts) { 1188 /* Can allocate before locking if have acts. */ 1189 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false, 1190 ufid_flags); 1191 if (IS_ERR(reply)) { 1192 error = PTR_ERR(reply); 1193 goto err_kfree_acts; 1194 } 1195 } 1196 1197 ovs_lock(); 1198 dp = get_dp(net, ovs_header->dp_ifindex); 1199 if (unlikely(!dp)) { 1200 error = -ENODEV; 1201 goto err_unlock_ovs; 1202 } 1203 /* Check that the flow exists. */ 1204 if (ufid_present) 1205 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid); 1206 else 1207 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1208 if (unlikely(!flow)) { 1209 error = -ENOENT; 1210 goto err_unlock_ovs; 1211 } 1212 1213 /* Update actions, if present. */ 1214 if (likely(acts)) { 1215 old_acts = ovsl_dereference(flow->sf_acts); 1216 rcu_assign_pointer(flow->sf_acts, acts); 1217 1218 if (unlikely(reply)) { 1219 error = ovs_flow_cmd_fill_info(flow, 1220 ovs_header->dp_ifindex, 1221 reply, info->snd_portid, 1222 info->snd_seq, 0, 1223 OVS_FLOW_CMD_SET, 1224 ufid_flags); 1225 BUG_ON(error < 0); 1226 } 1227 } else { 1228 /* Could not alloc without acts before locking. */ 1229 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1230 info, OVS_FLOW_CMD_SET, false, 1231 ufid_flags); 1232 1233 if (IS_ERR(reply)) { 1234 error = PTR_ERR(reply); 1235 goto err_unlock_ovs; 1236 } 1237 } 1238 1239 /* Clear stats. */ 1240 if (a[OVS_FLOW_ATTR_CLEAR]) 1241 ovs_flow_stats_clear(flow); 1242 ovs_unlock(); 1243 1244 if (reply) 1245 ovs_notify(&dp_flow_genl_family, reply, info); 1246 if (old_acts) 1247 ovs_nla_free_flow_actions_rcu(old_acts); 1248 1249 return 0; 1250 1251 err_unlock_ovs: 1252 ovs_unlock(); 1253 kfree_skb(reply); 1254 err_kfree_acts: 1255 ovs_nla_free_flow_actions(acts); 1256 error: 1257 return error; 1258 } 1259 1260 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1261 { 1262 struct nlattr **a = info->attrs; 1263 struct ovs_header *ovs_header = info->userhdr; 1264 struct net *net = sock_net(skb->sk); 1265 struct sw_flow_key key; 1266 struct sk_buff *reply; 1267 struct sw_flow *flow; 1268 struct datapath *dp; 1269 struct sw_flow_match match; 1270 struct sw_flow_id ufid; 1271 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1272 int err = 0; 1273 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1274 bool ufid_present; 1275 1276 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1277 if (a[OVS_FLOW_ATTR_KEY]) { 1278 ovs_match_init(&match, &key, true, NULL); 1279 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL, 1280 log); 1281 } else if (!ufid_present) { 1282 OVS_NLERR(log, 1283 "Flow get message rejected, Key attribute missing."); 1284 err = -EINVAL; 1285 } 1286 if (err) 1287 return err; 1288 1289 ovs_lock(); 1290 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1291 if (!dp) { 1292 err = -ENODEV; 1293 goto unlock; 1294 } 1295 1296 if (ufid_present) 1297 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1298 else 1299 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1300 if (!flow) { 1301 err = -ENOENT; 1302 goto unlock; 1303 } 1304 1305 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1306 OVS_FLOW_CMD_GET, true, ufid_flags); 1307 if (IS_ERR(reply)) { 1308 err = PTR_ERR(reply); 1309 goto unlock; 1310 } 1311 1312 ovs_unlock(); 1313 return genlmsg_reply(reply, info); 1314 unlock: 1315 ovs_unlock(); 1316 return err; 1317 } 1318 1319 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1320 { 1321 struct nlattr **a = info->attrs; 1322 struct ovs_header *ovs_header = info->userhdr; 1323 struct net *net = sock_net(skb->sk); 1324 struct sw_flow_key key; 1325 struct sk_buff *reply; 1326 struct sw_flow *flow = NULL; 1327 struct datapath *dp; 1328 struct sw_flow_match match; 1329 struct sw_flow_id ufid; 1330 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1331 int err; 1332 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1333 bool ufid_present; 1334 1335 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1336 if (a[OVS_FLOW_ATTR_KEY]) { 1337 ovs_match_init(&match, &key, true, NULL); 1338 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1339 NULL, log); 1340 if (unlikely(err)) 1341 return err; 1342 } 1343 1344 ovs_lock(); 1345 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1346 if (unlikely(!dp)) { 1347 err = -ENODEV; 1348 goto unlock; 1349 } 1350 1351 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) { 1352 err = ovs_flow_tbl_flush(&dp->table); 1353 goto unlock; 1354 } 1355 1356 if (ufid_present) 1357 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1358 else 1359 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1360 if (unlikely(!flow)) { 1361 err = -ENOENT; 1362 goto unlock; 1363 } 1364 1365 ovs_flow_tbl_remove(&dp->table, flow); 1366 ovs_unlock(); 1367 1368 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1369 &flow->id, info, false, ufid_flags); 1370 if (likely(reply)) { 1371 if (!IS_ERR(reply)) { 1372 rcu_read_lock(); /*To keep RCU checker happy. */ 1373 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1374 reply, info->snd_portid, 1375 info->snd_seq, 0, 1376 OVS_FLOW_CMD_DEL, 1377 ufid_flags); 1378 rcu_read_unlock(); 1379 if (WARN_ON_ONCE(err < 0)) { 1380 kfree_skb(reply); 1381 goto out_free; 1382 } 1383 1384 ovs_notify(&dp_flow_genl_family, reply, info); 1385 } else { 1386 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply)); 1387 } 1388 } 1389 1390 out_free: 1391 ovs_flow_free(flow, true); 1392 return 0; 1393 unlock: 1394 ovs_unlock(); 1395 return err; 1396 } 1397 1398 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1399 { 1400 struct nlattr *a[__OVS_FLOW_ATTR_MAX]; 1401 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1402 struct table_instance *ti; 1403 struct datapath *dp; 1404 u32 ufid_flags; 1405 int err; 1406 1407 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a, 1408 OVS_FLOW_ATTR_MAX, flow_policy, NULL); 1409 if (err) 1410 return err; 1411 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1412 1413 rcu_read_lock(); 1414 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1415 if (!dp) { 1416 rcu_read_unlock(); 1417 return -ENODEV; 1418 } 1419 1420 ti = rcu_dereference(dp->table.ti); 1421 for (;;) { 1422 struct sw_flow *flow; 1423 u32 bucket, obj; 1424 1425 bucket = cb->args[0]; 1426 obj = cb->args[1]; 1427 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1428 if (!flow) 1429 break; 1430 1431 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1432 NETLINK_CB(cb->skb).portid, 1433 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1434 OVS_FLOW_CMD_GET, ufid_flags) < 0) 1435 break; 1436 1437 cb->args[0] = bucket; 1438 cb->args[1] = obj; 1439 } 1440 rcu_read_unlock(); 1441 return skb->len; 1442 } 1443 1444 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1445 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1446 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1447 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1448 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1449 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1450 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, 1451 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, 1452 }; 1453 1454 static const struct genl_ops dp_flow_genl_ops[] = { 1455 { .cmd = OVS_FLOW_CMD_NEW, 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_new 1459 }, 1460 { .cmd = OVS_FLOW_CMD_DEL, 1461 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1462 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1463 .doit = ovs_flow_cmd_del 1464 }, 1465 { .cmd = OVS_FLOW_CMD_GET, 1466 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1467 .flags = 0, /* OK for unprivileged users. */ 1468 .doit = ovs_flow_cmd_get, 1469 .dumpit = ovs_flow_cmd_dump 1470 }, 1471 { .cmd = OVS_FLOW_CMD_SET, 1472 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1473 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1474 .doit = ovs_flow_cmd_set, 1475 }, 1476 }; 1477 1478 static struct genl_family dp_flow_genl_family __ro_after_init = { 1479 .hdrsize = sizeof(struct ovs_header), 1480 .name = OVS_FLOW_FAMILY, 1481 .version = OVS_FLOW_VERSION, 1482 .maxattr = OVS_FLOW_ATTR_MAX, 1483 .policy = flow_policy, 1484 .netnsok = true, 1485 .parallel_ops = true, 1486 .ops = dp_flow_genl_ops, 1487 .n_ops = ARRAY_SIZE(dp_flow_genl_ops), 1488 .mcgrps = &ovs_dp_flow_multicast_group, 1489 .n_mcgrps = 1, 1490 .module = THIS_MODULE, 1491 }; 1492 1493 static size_t ovs_dp_cmd_msg_size(void) 1494 { 1495 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1496 1497 msgsize += nla_total_size(IFNAMSIZ); 1498 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats)); 1499 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats)); 1500 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1501 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */ 1502 1503 return msgsize; 1504 } 1505 1506 /* Called with ovs_mutex. */ 1507 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1508 u32 portid, u32 seq, u32 flags, u8 cmd) 1509 { 1510 struct ovs_header *ovs_header; 1511 struct ovs_dp_stats dp_stats; 1512 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1513 int err; 1514 1515 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1516 flags, cmd); 1517 if (!ovs_header) 1518 goto error; 1519 1520 ovs_header->dp_ifindex = get_dpifindex(dp); 1521 1522 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1523 if (err) 1524 goto nla_put_failure; 1525 1526 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1527 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1528 &dp_stats, OVS_DP_ATTR_PAD)) 1529 goto nla_put_failure; 1530 1531 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1532 sizeof(struct ovs_dp_megaflow_stats), 1533 &dp_megaflow_stats, OVS_DP_ATTR_PAD)) 1534 goto nla_put_failure; 1535 1536 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1537 goto nla_put_failure; 1538 1539 if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE, 1540 ovs_flow_tbl_masks_cache_size(&dp->table))) 1541 goto nla_put_failure; 1542 1543 genlmsg_end(skb, ovs_header); 1544 return 0; 1545 1546 nla_put_failure: 1547 genlmsg_cancel(skb, ovs_header); 1548 error: 1549 return -EMSGSIZE; 1550 } 1551 1552 static struct sk_buff *ovs_dp_cmd_alloc_info(void) 1553 { 1554 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL); 1555 } 1556 1557 /* Called with rcu_read_lock or ovs_mutex. */ 1558 static struct datapath *lookup_datapath(struct net *net, 1559 const struct ovs_header *ovs_header, 1560 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1561 { 1562 struct datapath *dp; 1563 1564 if (!a[OVS_DP_ATTR_NAME]) 1565 dp = get_dp(net, ovs_header->dp_ifindex); 1566 else { 1567 struct vport *vport; 1568 1569 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1570 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1571 } 1572 return dp ? dp : ERR_PTR(-ENODEV); 1573 } 1574 1575 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info) 1576 { 1577 struct datapath *dp; 1578 1579 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1580 if (IS_ERR(dp)) 1581 return; 1582 1583 WARN(dp->user_features, "Dropping previously announced user features\n"); 1584 dp->user_features = 0; 1585 } 1586 1587 DEFINE_STATIC_KEY_FALSE(tc_recirc_sharing_support); 1588 1589 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1590 { 1591 u32 user_features = 0; 1592 1593 if (a[OVS_DP_ATTR_USER_FEATURES]) { 1594 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1595 1596 if (user_features & ~(OVS_DP_F_VPORT_PIDS | 1597 OVS_DP_F_UNALIGNED | 1598 OVS_DP_F_TC_RECIRC_SHARING)) 1599 return -EOPNOTSUPP; 1600 1601 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT) 1602 if (user_features & OVS_DP_F_TC_RECIRC_SHARING) 1603 return -EOPNOTSUPP; 1604 #endif 1605 } 1606 1607 if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) { 1608 int err; 1609 u32 cache_size; 1610 1611 cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]); 1612 err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size); 1613 if (err) 1614 return err; 1615 } 1616 1617 dp->user_features = user_features; 1618 1619 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) 1620 static_branch_enable(&tc_recirc_sharing_support); 1621 else 1622 static_branch_disable(&tc_recirc_sharing_support); 1623 1624 return 0; 1625 } 1626 1627 static int ovs_dp_stats_init(struct datapath *dp) 1628 { 1629 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1630 if (!dp->stats_percpu) 1631 return -ENOMEM; 1632 1633 return 0; 1634 } 1635 1636 static int ovs_dp_vport_init(struct datapath *dp) 1637 { 1638 int i; 1639 1640 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS, 1641 sizeof(struct hlist_head), 1642 GFP_KERNEL); 1643 if (!dp->ports) 1644 return -ENOMEM; 1645 1646 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1647 INIT_HLIST_HEAD(&dp->ports[i]); 1648 1649 return 0; 1650 } 1651 1652 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1653 { 1654 struct nlattr **a = info->attrs; 1655 struct vport_parms parms; 1656 struct sk_buff *reply; 1657 struct datapath *dp; 1658 struct vport *vport; 1659 struct ovs_net *ovs_net; 1660 int err; 1661 1662 err = -EINVAL; 1663 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1664 goto err; 1665 1666 reply = ovs_dp_cmd_alloc_info(); 1667 if (!reply) 1668 return -ENOMEM; 1669 1670 err = -ENOMEM; 1671 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1672 if (dp == NULL) 1673 goto err_destroy_reply; 1674 1675 ovs_dp_set_net(dp, sock_net(skb->sk)); 1676 1677 /* Allocate table. */ 1678 err = ovs_flow_tbl_init(&dp->table); 1679 if (err) 1680 goto err_destroy_dp; 1681 1682 err = ovs_dp_stats_init(dp); 1683 if (err) 1684 goto err_destroy_table; 1685 1686 err = ovs_dp_vport_init(dp); 1687 if (err) 1688 goto err_destroy_stats; 1689 1690 err = ovs_meters_init(dp); 1691 if (err) 1692 goto err_destroy_ports; 1693 1694 /* Set up our datapath device. */ 1695 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1696 parms.type = OVS_VPORT_TYPE_INTERNAL; 1697 parms.options = NULL; 1698 parms.dp = dp; 1699 parms.port_no = OVSP_LOCAL; 1700 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1701 1702 err = ovs_dp_change(dp, a); 1703 if (err) 1704 goto err_destroy_meters; 1705 1706 /* So far only local changes have been made, now need the lock. */ 1707 ovs_lock(); 1708 1709 vport = new_vport(&parms); 1710 if (IS_ERR(vport)) { 1711 err = PTR_ERR(vport); 1712 if (err == -EBUSY) 1713 err = -EEXIST; 1714 1715 if (err == -EEXIST) { 1716 /* An outdated user space instance that does not understand 1717 * the concept of user_features has attempted to create a new 1718 * datapath and is likely to reuse it. Drop all user features. 1719 */ 1720 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1721 ovs_dp_reset_user_features(skb, info); 1722 } 1723 1724 ovs_unlock(); 1725 goto err_destroy_meters; 1726 } 1727 1728 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1729 info->snd_seq, 0, OVS_DP_CMD_NEW); 1730 BUG_ON(err < 0); 1731 1732 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1733 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1734 1735 ovs_unlock(); 1736 1737 ovs_notify(&dp_datapath_genl_family, reply, info); 1738 return 0; 1739 1740 err_destroy_meters: 1741 ovs_meters_exit(dp); 1742 err_destroy_ports: 1743 kfree(dp->ports); 1744 err_destroy_stats: 1745 free_percpu(dp->stats_percpu); 1746 err_destroy_table: 1747 ovs_flow_tbl_destroy(&dp->table); 1748 err_destroy_dp: 1749 kfree(dp); 1750 err_destroy_reply: 1751 kfree_skb(reply); 1752 err: 1753 return err; 1754 } 1755 1756 /* Called with ovs_mutex. */ 1757 static void __dp_destroy(struct datapath *dp) 1758 { 1759 struct flow_table *table = &dp->table; 1760 int i; 1761 1762 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1763 struct vport *vport; 1764 struct hlist_node *n; 1765 1766 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1767 if (vport->port_no != OVSP_LOCAL) 1768 ovs_dp_detach_port(vport); 1769 } 1770 1771 list_del_rcu(&dp->list_node); 1772 1773 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1774 * all ports in datapath are destroyed first before freeing datapath. 1775 */ 1776 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1777 1778 /* Flush sw_flow in the tables. RCU cb only releases resource 1779 * such as dp, ports and tables. That may avoid some issues 1780 * such as RCU usage warning. 1781 */ 1782 table_instance_flow_flush(table, ovsl_dereference(table->ti), 1783 ovsl_dereference(table->ufid_ti)); 1784 1785 /* RCU destroy the ports, meters and flow tables. */ 1786 call_rcu(&dp->rcu, destroy_dp_rcu); 1787 } 1788 1789 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1790 { 1791 struct sk_buff *reply; 1792 struct datapath *dp; 1793 int err; 1794 1795 reply = ovs_dp_cmd_alloc_info(); 1796 if (!reply) 1797 return -ENOMEM; 1798 1799 ovs_lock(); 1800 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1801 err = PTR_ERR(dp); 1802 if (IS_ERR(dp)) 1803 goto err_unlock_free; 1804 1805 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1806 info->snd_seq, 0, OVS_DP_CMD_DEL); 1807 BUG_ON(err < 0); 1808 1809 __dp_destroy(dp); 1810 ovs_unlock(); 1811 1812 ovs_notify(&dp_datapath_genl_family, reply, info); 1813 1814 return 0; 1815 1816 err_unlock_free: 1817 ovs_unlock(); 1818 kfree_skb(reply); 1819 return err; 1820 } 1821 1822 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1823 { 1824 struct sk_buff *reply; 1825 struct datapath *dp; 1826 int err; 1827 1828 reply = ovs_dp_cmd_alloc_info(); 1829 if (!reply) 1830 return -ENOMEM; 1831 1832 ovs_lock(); 1833 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1834 err = PTR_ERR(dp); 1835 if (IS_ERR(dp)) 1836 goto err_unlock_free; 1837 1838 err = ovs_dp_change(dp, info->attrs); 1839 if (err) 1840 goto err_unlock_free; 1841 1842 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1843 info->snd_seq, 0, OVS_DP_CMD_SET); 1844 BUG_ON(err < 0); 1845 1846 ovs_unlock(); 1847 ovs_notify(&dp_datapath_genl_family, reply, info); 1848 1849 return 0; 1850 1851 err_unlock_free: 1852 ovs_unlock(); 1853 kfree_skb(reply); 1854 return err; 1855 } 1856 1857 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1858 { 1859 struct sk_buff *reply; 1860 struct datapath *dp; 1861 int err; 1862 1863 reply = ovs_dp_cmd_alloc_info(); 1864 if (!reply) 1865 return -ENOMEM; 1866 1867 ovs_lock(); 1868 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1869 if (IS_ERR(dp)) { 1870 err = PTR_ERR(dp); 1871 goto err_unlock_free; 1872 } 1873 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1874 info->snd_seq, 0, OVS_DP_CMD_GET); 1875 BUG_ON(err < 0); 1876 ovs_unlock(); 1877 1878 return genlmsg_reply(reply, info); 1879 1880 err_unlock_free: 1881 ovs_unlock(); 1882 kfree_skb(reply); 1883 return err; 1884 } 1885 1886 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1887 { 1888 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1889 struct datapath *dp; 1890 int skip = cb->args[0]; 1891 int i = 0; 1892 1893 ovs_lock(); 1894 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1895 if (i >= skip && 1896 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1897 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1898 OVS_DP_CMD_GET) < 0) 1899 break; 1900 i++; 1901 } 1902 ovs_unlock(); 1903 1904 cb->args[0] = i; 1905 1906 return skb->len; 1907 } 1908 1909 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1910 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1911 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1912 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1913 [OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0, 1914 PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)), 1915 }; 1916 1917 static const struct genl_ops dp_datapath_genl_ops[] = { 1918 { .cmd = OVS_DP_CMD_NEW, 1919 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1920 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1921 .doit = ovs_dp_cmd_new 1922 }, 1923 { .cmd = OVS_DP_CMD_DEL, 1924 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1925 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1926 .doit = ovs_dp_cmd_del 1927 }, 1928 { .cmd = OVS_DP_CMD_GET, 1929 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1930 .flags = 0, /* OK for unprivileged users. */ 1931 .doit = ovs_dp_cmd_get, 1932 .dumpit = ovs_dp_cmd_dump 1933 }, 1934 { .cmd = OVS_DP_CMD_SET, 1935 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1936 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1937 .doit = ovs_dp_cmd_set, 1938 }, 1939 }; 1940 1941 static struct genl_family dp_datapath_genl_family __ro_after_init = { 1942 .hdrsize = sizeof(struct ovs_header), 1943 .name = OVS_DATAPATH_FAMILY, 1944 .version = OVS_DATAPATH_VERSION, 1945 .maxattr = OVS_DP_ATTR_MAX, 1946 .policy = datapath_policy, 1947 .netnsok = true, 1948 .parallel_ops = true, 1949 .ops = dp_datapath_genl_ops, 1950 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops), 1951 .mcgrps = &ovs_dp_datapath_multicast_group, 1952 .n_mcgrps = 1, 1953 .module = THIS_MODULE, 1954 }; 1955 1956 /* Called with ovs_mutex or RCU read lock. */ 1957 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1958 struct net *net, u32 portid, u32 seq, 1959 u32 flags, u8 cmd, gfp_t gfp) 1960 { 1961 struct ovs_header *ovs_header; 1962 struct ovs_vport_stats vport_stats; 1963 int err; 1964 1965 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1966 flags, cmd); 1967 if (!ovs_header) 1968 return -EMSGSIZE; 1969 1970 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1971 1972 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1973 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1974 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 1975 ovs_vport_name(vport)) || 1976 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex)) 1977 goto nla_put_failure; 1978 1979 if (!net_eq(net, dev_net(vport->dev))) { 1980 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp); 1981 1982 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id)) 1983 goto nla_put_failure; 1984 } 1985 1986 ovs_vport_get_stats(vport, &vport_stats); 1987 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS, 1988 sizeof(struct ovs_vport_stats), &vport_stats, 1989 OVS_VPORT_ATTR_PAD)) 1990 goto nla_put_failure; 1991 1992 if (ovs_vport_get_upcall_portids(vport, skb)) 1993 goto nla_put_failure; 1994 1995 err = ovs_vport_get_options(vport, skb); 1996 if (err == -EMSGSIZE) 1997 goto error; 1998 1999 genlmsg_end(skb, ovs_header); 2000 return 0; 2001 2002 nla_put_failure: 2003 err = -EMSGSIZE; 2004 error: 2005 genlmsg_cancel(skb, ovs_header); 2006 return err; 2007 } 2008 2009 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 2010 { 2011 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2012 } 2013 2014 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 2015 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net, 2016 u32 portid, u32 seq, u8 cmd) 2017 { 2018 struct sk_buff *skb; 2019 int retval; 2020 2021 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2022 if (!skb) 2023 return ERR_PTR(-ENOMEM); 2024 2025 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd, 2026 GFP_KERNEL); 2027 BUG_ON(retval < 0); 2028 2029 return skb; 2030 } 2031 2032 /* Called with ovs_mutex or RCU read lock. */ 2033 static struct vport *lookup_vport(struct net *net, 2034 const struct ovs_header *ovs_header, 2035 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 2036 { 2037 struct datapath *dp; 2038 struct vport *vport; 2039 2040 if (a[OVS_VPORT_ATTR_IFINDEX]) 2041 return ERR_PTR(-EOPNOTSUPP); 2042 if (a[OVS_VPORT_ATTR_NAME]) { 2043 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 2044 if (!vport) 2045 return ERR_PTR(-ENODEV); 2046 if (ovs_header->dp_ifindex && 2047 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 2048 return ERR_PTR(-ENODEV); 2049 return vport; 2050 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 2051 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 2052 2053 if (port_no >= DP_MAX_PORTS) 2054 return ERR_PTR(-EFBIG); 2055 2056 dp = get_dp(net, ovs_header->dp_ifindex); 2057 if (!dp) 2058 return ERR_PTR(-ENODEV); 2059 2060 vport = ovs_vport_ovsl_rcu(dp, port_no); 2061 if (!vport) 2062 return ERR_PTR(-ENODEV); 2063 return vport; 2064 } else 2065 return ERR_PTR(-EINVAL); 2066 2067 } 2068 2069 static unsigned int ovs_get_max_headroom(struct datapath *dp) 2070 { 2071 unsigned int dev_headroom, max_headroom = 0; 2072 struct net_device *dev; 2073 struct vport *vport; 2074 int i; 2075 2076 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2077 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, 2078 lockdep_ovsl_is_held()) { 2079 dev = vport->dev; 2080 dev_headroom = netdev_get_fwd_headroom(dev); 2081 if (dev_headroom > max_headroom) 2082 max_headroom = dev_headroom; 2083 } 2084 } 2085 2086 return max_headroom; 2087 } 2088 2089 /* Called with ovs_mutex */ 2090 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom) 2091 { 2092 struct vport *vport; 2093 int i; 2094 2095 dp->max_headroom = new_headroom; 2096 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 2097 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, 2098 lockdep_ovsl_is_held()) 2099 netdev_set_rx_headroom(vport->dev, new_headroom); 2100 } 2101 2102 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 2103 { 2104 struct nlattr **a = info->attrs; 2105 struct ovs_header *ovs_header = info->userhdr; 2106 struct vport_parms parms; 2107 struct sk_buff *reply; 2108 struct vport *vport; 2109 struct datapath *dp; 2110 unsigned int new_headroom; 2111 u32 port_no; 2112 int err; 2113 2114 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 2115 !a[OVS_VPORT_ATTR_UPCALL_PID]) 2116 return -EINVAL; 2117 if (a[OVS_VPORT_ATTR_IFINDEX]) 2118 return -EOPNOTSUPP; 2119 2120 port_no = a[OVS_VPORT_ATTR_PORT_NO] 2121 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 2122 if (port_no >= DP_MAX_PORTS) 2123 return -EFBIG; 2124 2125 reply = ovs_vport_cmd_alloc_info(); 2126 if (!reply) 2127 return -ENOMEM; 2128 2129 ovs_lock(); 2130 restart: 2131 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 2132 err = -ENODEV; 2133 if (!dp) 2134 goto exit_unlock_free; 2135 2136 if (port_no) { 2137 vport = ovs_vport_ovsl(dp, port_no); 2138 err = -EBUSY; 2139 if (vport) 2140 goto exit_unlock_free; 2141 } else { 2142 for (port_no = 1; ; port_no++) { 2143 if (port_no >= DP_MAX_PORTS) { 2144 err = -EFBIG; 2145 goto exit_unlock_free; 2146 } 2147 vport = ovs_vport_ovsl(dp, port_no); 2148 if (!vport) 2149 break; 2150 } 2151 } 2152 2153 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 2154 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 2155 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 2156 parms.dp = dp; 2157 parms.port_no = port_no; 2158 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2159 2160 vport = new_vport(&parms); 2161 err = PTR_ERR(vport); 2162 if (IS_ERR(vport)) { 2163 if (err == -EAGAIN) 2164 goto restart; 2165 goto exit_unlock_free; 2166 } 2167 2168 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2169 info->snd_portid, info->snd_seq, 0, 2170 OVS_VPORT_CMD_NEW, GFP_KERNEL); 2171 2172 new_headroom = netdev_get_fwd_headroom(vport->dev); 2173 2174 if (new_headroom > dp->max_headroom) 2175 ovs_update_headroom(dp, new_headroom); 2176 else 2177 netdev_set_rx_headroom(vport->dev, dp->max_headroom); 2178 2179 BUG_ON(err < 0); 2180 ovs_unlock(); 2181 2182 ovs_notify(&dp_vport_genl_family, reply, info); 2183 return 0; 2184 2185 exit_unlock_free: 2186 ovs_unlock(); 2187 kfree_skb(reply); 2188 return err; 2189 } 2190 2191 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 2192 { 2193 struct nlattr **a = info->attrs; 2194 struct sk_buff *reply; 2195 struct vport *vport; 2196 int err; 2197 2198 reply = ovs_vport_cmd_alloc_info(); 2199 if (!reply) 2200 return -ENOMEM; 2201 2202 ovs_lock(); 2203 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2204 err = PTR_ERR(vport); 2205 if (IS_ERR(vport)) 2206 goto exit_unlock_free; 2207 2208 if (a[OVS_VPORT_ATTR_TYPE] && 2209 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 2210 err = -EINVAL; 2211 goto exit_unlock_free; 2212 } 2213 2214 if (a[OVS_VPORT_ATTR_OPTIONS]) { 2215 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 2216 if (err) 2217 goto exit_unlock_free; 2218 } 2219 2220 2221 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 2222 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2223 2224 err = ovs_vport_set_upcall_portids(vport, ids); 2225 if (err) 2226 goto exit_unlock_free; 2227 } 2228 2229 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2230 info->snd_portid, info->snd_seq, 0, 2231 OVS_VPORT_CMD_SET, GFP_KERNEL); 2232 BUG_ON(err < 0); 2233 2234 ovs_unlock(); 2235 ovs_notify(&dp_vport_genl_family, reply, info); 2236 return 0; 2237 2238 exit_unlock_free: 2239 ovs_unlock(); 2240 kfree_skb(reply); 2241 return err; 2242 } 2243 2244 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2245 { 2246 bool update_headroom = false; 2247 struct nlattr **a = info->attrs; 2248 struct sk_buff *reply; 2249 struct datapath *dp; 2250 struct vport *vport; 2251 unsigned int new_headroom; 2252 int err; 2253 2254 reply = ovs_vport_cmd_alloc_info(); 2255 if (!reply) 2256 return -ENOMEM; 2257 2258 ovs_lock(); 2259 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2260 err = PTR_ERR(vport); 2261 if (IS_ERR(vport)) 2262 goto exit_unlock_free; 2263 2264 if (vport->port_no == OVSP_LOCAL) { 2265 err = -EINVAL; 2266 goto exit_unlock_free; 2267 } 2268 2269 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2270 info->snd_portid, info->snd_seq, 0, 2271 OVS_VPORT_CMD_DEL, GFP_KERNEL); 2272 BUG_ON(err < 0); 2273 2274 /* the vport deletion may trigger dp headroom update */ 2275 dp = vport->dp; 2276 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom) 2277 update_headroom = true; 2278 2279 netdev_reset_rx_headroom(vport->dev); 2280 ovs_dp_detach_port(vport); 2281 2282 if (update_headroom) { 2283 new_headroom = ovs_get_max_headroom(dp); 2284 2285 if (new_headroom < dp->max_headroom) 2286 ovs_update_headroom(dp, new_headroom); 2287 } 2288 ovs_unlock(); 2289 2290 ovs_notify(&dp_vport_genl_family, reply, info); 2291 return 0; 2292 2293 exit_unlock_free: 2294 ovs_unlock(); 2295 kfree_skb(reply); 2296 return err; 2297 } 2298 2299 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2300 { 2301 struct nlattr **a = info->attrs; 2302 struct ovs_header *ovs_header = info->userhdr; 2303 struct sk_buff *reply; 2304 struct vport *vport; 2305 int err; 2306 2307 reply = ovs_vport_cmd_alloc_info(); 2308 if (!reply) 2309 return -ENOMEM; 2310 2311 rcu_read_lock(); 2312 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2313 err = PTR_ERR(vport); 2314 if (IS_ERR(vport)) 2315 goto exit_unlock_free; 2316 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2317 info->snd_portid, info->snd_seq, 0, 2318 OVS_VPORT_CMD_GET, GFP_ATOMIC); 2319 BUG_ON(err < 0); 2320 rcu_read_unlock(); 2321 2322 return genlmsg_reply(reply, info); 2323 2324 exit_unlock_free: 2325 rcu_read_unlock(); 2326 kfree_skb(reply); 2327 return err; 2328 } 2329 2330 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2331 { 2332 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2333 struct datapath *dp; 2334 int bucket = cb->args[0], skip = cb->args[1]; 2335 int i, j = 0; 2336 2337 rcu_read_lock(); 2338 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2339 if (!dp) { 2340 rcu_read_unlock(); 2341 return -ENODEV; 2342 } 2343 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2344 struct vport *vport; 2345 2346 j = 0; 2347 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2348 if (j >= skip && 2349 ovs_vport_cmd_fill_info(vport, skb, 2350 sock_net(skb->sk), 2351 NETLINK_CB(cb->skb).portid, 2352 cb->nlh->nlmsg_seq, 2353 NLM_F_MULTI, 2354 OVS_VPORT_CMD_GET, 2355 GFP_ATOMIC) < 0) 2356 goto out; 2357 2358 j++; 2359 } 2360 skip = 0; 2361 } 2362 out: 2363 rcu_read_unlock(); 2364 2365 cb->args[0] = i; 2366 cb->args[1] = j; 2367 2368 return skb->len; 2369 } 2370 2371 static void ovs_dp_masks_rebalance(struct work_struct *work) 2372 { 2373 struct ovs_net *ovs_net = container_of(work, struct ovs_net, 2374 masks_rebalance.work); 2375 struct datapath *dp; 2376 2377 ovs_lock(); 2378 2379 list_for_each_entry(dp, &ovs_net->dps, list_node) 2380 ovs_flow_masks_rebalance(&dp->table); 2381 2382 ovs_unlock(); 2383 2384 schedule_delayed_work(&ovs_net->masks_rebalance, 2385 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL)); 2386 } 2387 2388 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2389 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2390 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2391 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2392 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2393 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC }, 2394 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2395 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 }, 2396 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 }, 2397 }; 2398 2399 static const struct genl_ops dp_vport_genl_ops[] = { 2400 { .cmd = OVS_VPORT_CMD_NEW, 2401 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2402 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2403 .doit = ovs_vport_cmd_new 2404 }, 2405 { .cmd = OVS_VPORT_CMD_DEL, 2406 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2407 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2408 .doit = ovs_vport_cmd_del 2409 }, 2410 { .cmd = OVS_VPORT_CMD_GET, 2411 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2412 .flags = 0, /* OK for unprivileged users. */ 2413 .doit = ovs_vport_cmd_get, 2414 .dumpit = ovs_vport_cmd_dump 2415 }, 2416 { .cmd = OVS_VPORT_CMD_SET, 2417 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2418 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2419 .doit = ovs_vport_cmd_set, 2420 }, 2421 }; 2422 2423 struct genl_family dp_vport_genl_family __ro_after_init = { 2424 .hdrsize = sizeof(struct ovs_header), 2425 .name = OVS_VPORT_FAMILY, 2426 .version = OVS_VPORT_VERSION, 2427 .maxattr = OVS_VPORT_ATTR_MAX, 2428 .policy = vport_policy, 2429 .netnsok = true, 2430 .parallel_ops = true, 2431 .ops = dp_vport_genl_ops, 2432 .n_ops = ARRAY_SIZE(dp_vport_genl_ops), 2433 .mcgrps = &ovs_dp_vport_multicast_group, 2434 .n_mcgrps = 1, 2435 .module = THIS_MODULE, 2436 }; 2437 2438 static struct genl_family * const dp_genl_families[] = { 2439 &dp_datapath_genl_family, 2440 &dp_vport_genl_family, 2441 &dp_flow_genl_family, 2442 &dp_packet_genl_family, 2443 &dp_meter_genl_family, 2444 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 2445 &dp_ct_limit_genl_family, 2446 #endif 2447 }; 2448 2449 static void dp_unregister_genl(int n_families) 2450 { 2451 int i; 2452 2453 for (i = 0; i < n_families; i++) 2454 genl_unregister_family(dp_genl_families[i]); 2455 } 2456 2457 static int __init dp_register_genl(void) 2458 { 2459 int err; 2460 int i; 2461 2462 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2463 2464 err = genl_register_family(dp_genl_families[i]); 2465 if (err) 2466 goto error; 2467 } 2468 2469 return 0; 2470 2471 error: 2472 dp_unregister_genl(i); 2473 return err; 2474 } 2475 2476 static int __net_init ovs_init_net(struct net *net) 2477 { 2478 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2479 2480 INIT_LIST_HEAD(&ovs_net->dps); 2481 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2482 INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance); 2483 schedule_delayed_work(&ovs_net->masks_rebalance, 2484 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL)); 2485 return ovs_ct_init(net); 2486 } 2487 2488 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2489 struct list_head *head) 2490 { 2491 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2492 struct datapath *dp; 2493 2494 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2495 int i; 2496 2497 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2498 struct vport *vport; 2499 2500 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2501 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2502 continue; 2503 2504 if (dev_net(vport->dev) == dnet) 2505 list_add(&vport->detach_list, head); 2506 } 2507 } 2508 } 2509 } 2510 2511 static void __net_exit ovs_exit_net(struct net *dnet) 2512 { 2513 struct datapath *dp, *dp_next; 2514 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2515 struct vport *vport, *vport_next; 2516 struct net *net; 2517 LIST_HEAD(head); 2518 2519 ovs_lock(); 2520 2521 ovs_ct_exit(dnet); 2522 2523 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2524 __dp_destroy(dp); 2525 2526 down_read(&net_rwsem); 2527 for_each_net(net) 2528 list_vports_from_net(net, dnet, &head); 2529 up_read(&net_rwsem); 2530 2531 /* Detach all vports from given namespace. */ 2532 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2533 list_del(&vport->detach_list); 2534 ovs_dp_detach_port(vport); 2535 } 2536 2537 ovs_unlock(); 2538 2539 cancel_delayed_work_sync(&ovs_net->masks_rebalance); 2540 cancel_work_sync(&ovs_net->dp_notify_work); 2541 } 2542 2543 static struct pernet_operations ovs_net_ops = { 2544 .init = ovs_init_net, 2545 .exit = ovs_exit_net, 2546 .id = &ovs_net_id, 2547 .size = sizeof(struct ovs_net), 2548 }; 2549 2550 static int __init dp_init(void) 2551 { 2552 int err; 2553 2554 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof_field(struct sk_buff, cb)); 2555 2556 pr_info("Open vSwitch switching datapath\n"); 2557 2558 err = action_fifos_init(); 2559 if (err) 2560 goto error; 2561 2562 err = ovs_internal_dev_rtnl_link_register(); 2563 if (err) 2564 goto error_action_fifos_exit; 2565 2566 err = ovs_flow_init(); 2567 if (err) 2568 goto error_unreg_rtnl_link; 2569 2570 err = ovs_vport_init(); 2571 if (err) 2572 goto error_flow_exit; 2573 2574 err = register_pernet_device(&ovs_net_ops); 2575 if (err) 2576 goto error_vport_exit; 2577 2578 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2579 if (err) 2580 goto error_netns_exit; 2581 2582 err = ovs_netdev_init(); 2583 if (err) 2584 goto error_unreg_notifier; 2585 2586 err = dp_register_genl(); 2587 if (err < 0) 2588 goto error_unreg_netdev; 2589 2590 return 0; 2591 2592 error_unreg_netdev: 2593 ovs_netdev_exit(); 2594 error_unreg_notifier: 2595 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2596 error_netns_exit: 2597 unregister_pernet_device(&ovs_net_ops); 2598 error_vport_exit: 2599 ovs_vport_exit(); 2600 error_flow_exit: 2601 ovs_flow_exit(); 2602 error_unreg_rtnl_link: 2603 ovs_internal_dev_rtnl_link_unregister(); 2604 error_action_fifos_exit: 2605 action_fifos_exit(); 2606 error: 2607 return err; 2608 } 2609 2610 static void dp_cleanup(void) 2611 { 2612 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2613 ovs_netdev_exit(); 2614 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2615 unregister_pernet_device(&ovs_net_ops); 2616 rcu_barrier(); 2617 ovs_vport_exit(); 2618 ovs_flow_exit(); 2619 ovs_internal_dev_rtnl_link_unregister(); 2620 action_fifos_exit(); 2621 } 2622 2623 module_init(dp_init); 2624 module_exit(dp_cleanup); 2625 2626 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2627 MODULE_LICENSE("GPL"); 2628 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY); 2629 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY); 2630 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY); 2631 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY); 2632 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY); 2633 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY); 2634