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 "openvswitch_trace.h" 47 #include "vport-internal_dev.h" 48 #include "vport-netdev.h" 49 50 unsigned int ovs_net_id __read_mostly; 51 52 static struct genl_family dp_packet_genl_family; 53 static struct genl_family dp_flow_genl_family; 54 static struct genl_family dp_datapath_genl_family; 55 56 static const struct nla_policy flow_policy[]; 57 58 static const struct genl_multicast_group ovs_dp_flow_multicast_group = { 59 .name = OVS_FLOW_MCGROUP, 60 }; 61 62 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = { 63 .name = OVS_DATAPATH_MCGROUP, 64 }; 65 66 static const struct genl_multicast_group ovs_dp_vport_multicast_group = { 67 .name = OVS_VPORT_MCGROUP, 68 }; 69 70 /* Check if need to build a reply message. 71 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */ 72 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info, 73 unsigned int group) 74 { 75 return info->nlhdr->nlmsg_flags & NLM_F_ECHO || 76 genl_has_listeners(family, genl_info_net(info), group); 77 } 78 79 static void ovs_notify(struct genl_family *family, 80 struct sk_buff *skb, struct genl_info *info) 81 { 82 genl_notify(family, skb, info, 0, GFP_KERNEL); 83 } 84 85 /** 86 * DOC: Locking: 87 * 88 * All writes e.g. Writes to device state (add/remove datapath, port, set 89 * operations on vports, etc.), Writes to other state (flow table 90 * modifications, set miscellaneous datapath parameters, etc.) are protected 91 * by ovs_lock. 92 * 93 * Reads are protected by RCU. 94 * 95 * There are a few special cases (mostly stats) that have their own 96 * synchronization but they nest under all of above and don't interact with 97 * each other. 98 * 99 * The RTNL lock nests inside ovs_mutex. 100 */ 101 102 static DEFINE_MUTEX(ovs_mutex); 103 104 void ovs_lock(void) 105 { 106 mutex_lock(&ovs_mutex); 107 } 108 109 void ovs_unlock(void) 110 { 111 mutex_unlock(&ovs_mutex); 112 } 113 114 #ifdef CONFIG_LOCKDEP 115 int lockdep_ovsl_is_held(void) 116 { 117 if (debug_locks) 118 return lockdep_is_held(&ovs_mutex); 119 else 120 return 1; 121 } 122 #endif 123 124 static struct vport *new_vport(const struct vport_parms *); 125 static int queue_gso_packets(struct datapath *dp, struct sk_buff *, 126 const struct sw_flow_key *, 127 const struct dp_upcall_info *, 128 uint32_t cutlen); 129 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *, 130 const struct sw_flow_key *, 131 const struct dp_upcall_info *, 132 uint32_t cutlen); 133 134 static void ovs_dp_masks_rebalance(struct work_struct *work); 135 136 /* Must be called with rcu_read_lock or ovs_mutex. */ 137 const char *ovs_dp_name(const struct datapath *dp) 138 { 139 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); 140 return ovs_vport_name(vport); 141 } 142 143 static int get_dpifindex(const struct datapath *dp) 144 { 145 struct vport *local; 146 int ifindex; 147 148 rcu_read_lock(); 149 150 local = ovs_vport_rcu(dp, OVSP_LOCAL); 151 if (local) 152 ifindex = local->dev->ifindex; 153 else 154 ifindex = 0; 155 156 rcu_read_unlock(); 157 158 return ifindex; 159 } 160 161 static void destroy_dp_rcu(struct rcu_head *rcu) 162 { 163 struct datapath *dp = container_of(rcu, struct datapath, rcu); 164 165 ovs_flow_tbl_destroy(&dp->table); 166 free_percpu(dp->stats_percpu); 167 kfree(dp->ports); 168 ovs_meters_exit(dp); 169 kfree(dp); 170 } 171 172 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 173 u16 port_no) 174 { 175 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 176 } 177 178 /* Called with ovs_mutex or RCU read lock. */ 179 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 180 { 181 struct vport *vport; 182 struct hlist_head *head; 183 184 head = vport_hash_bucket(dp, port_no); 185 hlist_for_each_entry_rcu(vport, head, dp_hash_node, 186 lockdep_ovsl_is_held()) { 187 if (vport->port_no == port_no) 188 return vport; 189 } 190 return NULL; 191 } 192 193 /* Called with ovs_mutex. */ 194 static struct vport *new_vport(const struct vport_parms *parms) 195 { 196 struct vport *vport; 197 198 vport = ovs_vport_add(parms); 199 if (!IS_ERR(vport)) { 200 struct datapath *dp = parms->dp; 201 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 202 203 hlist_add_head_rcu(&vport->dp_hash_node, head); 204 } 205 return vport; 206 } 207 208 void ovs_dp_detach_port(struct vport *p) 209 { 210 ASSERT_OVSL(); 211 212 /* First drop references to device. */ 213 hlist_del_rcu(&p->dp_hash_node); 214 215 /* Then destroy it. */ 216 ovs_vport_del(p); 217 } 218 219 /* Must be called with rcu_read_lock. */ 220 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key) 221 { 222 const struct vport *p = OVS_CB(skb)->input_vport; 223 struct datapath *dp = p->dp; 224 struct sw_flow *flow; 225 struct sw_flow_actions *sf_acts; 226 struct dp_stats_percpu *stats; 227 u64 *stats_counter; 228 u32 n_mask_hit; 229 u32 n_cache_hit; 230 int error; 231 232 stats = this_cpu_ptr(dp->stats_percpu); 233 234 /* Look up flow. */ 235 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb), 236 &n_mask_hit, &n_cache_hit); 237 if (unlikely(!flow)) { 238 struct dp_upcall_info upcall; 239 240 memset(&upcall, 0, sizeof(upcall)); 241 upcall.cmd = OVS_PACKET_CMD_MISS; 242 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 243 upcall.mru = OVS_CB(skb)->mru; 244 error = ovs_dp_upcall(dp, skb, key, &upcall, 0); 245 if (unlikely(error)) 246 kfree_skb(skb); 247 else 248 consume_skb(skb); 249 stats_counter = &stats->n_missed; 250 goto out; 251 } 252 253 ovs_flow_stats_update(flow, key->tp.flags, skb); 254 sf_acts = rcu_dereference(flow->sf_acts); 255 error = ovs_execute_actions(dp, skb, sf_acts, key); 256 if (unlikely(error)) 257 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n", 258 ovs_dp_name(dp), error); 259 260 stats_counter = &stats->n_hit; 261 262 out: 263 /* Update datapath statistics. */ 264 u64_stats_update_begin(&stats->syncp); 265 (*stats_counter)++; 266 stats->n_mask_hit += n_mask_hit; 267 stats->n_cache_hit += n_cache_hit; 268 u64_stats_update_end(&stats->syncp); 269 } 270 271 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 272 const struct sw_flow_key *key, 273 const struct dp_upcall_info *upcall_info, 274 uint32_t cutlen) 275 { 276 struct dp_stats_percpu *stats; 277 int err; 278 279 if (trace_ovs_dp_upcall_enabled()) 280 trace_ovs_dp_upcall(dp, skb, key, upcall_info); 281 282 if (upcall_info->portid == 0) { 283 err = -ENOTCONN; 284 goto err; 285 } 286 287 if (!skb_is_gso(skb)) 288 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 289 else 290 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen); 291 if (err) 292 goto err; 293 294 return 0; 295 296 err: 297 stats = this_cpu_ptr(dp->stats_percpu); 298 299 u64_stats_update_begin(&stats->syncp); 300 stats->n_lost++; 301 u64_stats_update_end(&stats->syncp); 302 303 return err; 304 } 305 306 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 307 const struct sw_flow_key *key, 308 const struct dp_upcall_info *upcall_info, 309 uint32_t cutlen) 310 { 311 unsigned int gso_type = skb_shinfo(skb)->gso_type; 312 struct sw_flow_key later_key; 313 struct sk_buff *segs, *nskb; 314 int err; 315 316 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET); 317 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 318 if (IS_ERR(segs)) 319 return PTR_ERR(segs); 320 if (segs == NULL) 321 return -EINVAL; 322 323 if (gso_type & SKB_GSO_UDP) { 324 /* The initial flow key extracted by ovs_flow_key_extract() 325 * in this case is for a first fragment, so we need to 326 * properly mark later fragments. 327 */ 328 later_key = *key; 329 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 330 } 331 332 /* Queue all of the segments. */ 333 skb_list_walk_safe(segs, skb, nskb) { 334 if (gso_type & SKB_GSO_UDP && skb != segs) 335 key = &later_key; 336 337 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 338 if (err) 339 break; 340 341 } 342 343 /* Free all of the segments. */ 344 skb_list_walk_safe(segs, skb, nskb) { 345 if (err) 346 kfree_skb(skb); 347 else 348 consume_skb(skb); 349 } 350 return err; 351 } 352 353 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, 354 unsigned int hdrlen, int actions_attrlen) 355 { 356 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 357 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 358 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */ 359 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */ 360 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */ 361 362 /* OVS_PACKET_ATTR_USERDATA */ 363 if (upcall_info->userdata) 364 size += NLA_ALIGN(upcall_info->userdata->nla_len); 365 366 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ 367 if (upcall_info->egress_tun_info) 368 size += nla_total_size(ovs_tun_key_attr_size()); 369 370 /* OVS_PACKET_ATTR_ACTIONS */ 371 if (upcall_info->actions_len) 372 size += nla_total_size(actions_attrlen); 373 374 /* OVS_PACKET_ATTR_MRU */ 375 if (upcall_info->mru) 376 size += nla_total_size(sizeof(upcall_info->mru)); 377 378 return size; 379 } 380 381 static void pad_packet(struct datapath *dp, struct sk_buff *skb) 382 { 383 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 384 size_t plen = NLA_ALIGN(skb->len) - skb->len; 385 386 if (plen > 0) 387 skb_put_zero(skb, plen); 388 } 389 } 390 391 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 392 const struct sw_flow_key *key, 393 const struct dp_upcall_info *upcall_info, 394 uint32_t cutlen) 395 { 396 struct ovs_header *upcall; 397 struct sk_buff *nskb = NULL; 398 struct sk_buff *user_skb = NULL; /* to be queued to userspace */ 399 struct nlattr *nla; 400 size_t len; 401 unsigned int hlen; 402 int err, dp_ifindex; 403 u64 hash; 404 405 dp_ifindex = get_dpifindex(dp); 406 if (!dp_ifindex) 407 return -ENODEV; 408 409 if (skb_vlan_tag_present(skb)) { 410 nskb = skb_clone(skb, GFP_ATOMIC); 411 if (!nskb) 412 return -ENOMEM; 413 414 nskb = __vlan_hwaccel_push_inside(nskb); 415 if (!nskb) 416 return -ENOMEM; 417 418 skb = nskb; 419 } 420 421 if (nla_attr_size(skb->len) > USHRT_MAX) { 422 err = -EFBIG; 423 goto out; 424 } 425 426 /* Complete checksum if needed */ 427 if (skb->ip_summed == CHECKSUM_PARTIAL && 428 (err = skb_csum_hwoffload_help(skb, 0))) 429 goto out; 430 431 /* Older versions of OVS user space enforce alignment of the last 432 * Netlink attribute to NLA_ALIGNTO which would require extensive 433 * padding logic. Only perform zerocopy if padding is not required. 434 */ 435 if (dp->user_features & OVS_DP_F_UNALIGNED) 436 hlen = skb_zerocopy_headlen(skb); 437 else 438 hlen = skb->len; 439 440 len = upcall_msg_size(upcall_info, hlen - cutlen, 441 OVS_CB(skb)->acts_origlen); 442 user_skb = genlmsg_new(len, GFP_ATOMIC); 443 if (!user_skb) { 444 err = -ENOMEM; 445 goto out; 446 } 447 448 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 449 0, upcall_info->cmd); 450 if (!upcall) { 451 err = -EINVAL; 452 goto out; 453 } 454 upcall->dp_ifindex = dp_ifindex; 455 456 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); 457 if (err) 458 goto out; 459 460 if (upcall_info->userdata) 461 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 462 nla_len(upcall_info->userdata), 463 nla_data(upcall_info->userdata)); 464 465 if (upcall_info->egress_tun_info) { 466 nla = nla_nest_start_noflag(user_skb, 467 OVS_PACKET_ATTR_EGRESS_TUN_KEY); 468 if (!nla) { 469 err = -EMSGSIZE; 470 goto out; 471 } 472 err = ovs_nla_put_tunnel_info(user_skb, 473 upcall_info->egress_tun_info); 474 if (err) 475 goto out; 476 477 nla_nest_end(user_skb, nla); 478 } 479 480 if (upcall_info->actions_len) { 481 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS); 482 if (!nla) { 483 err = -EMSGSIZE; 484 goto out; 485 } 486 err = ovs_nla_put_actions(upcall_info->actions, 487 upcall_info->actions_len, 488 user_skb); 489 if (!err) 490 nla_nest_end(user_skb, nla); 491 else 492 nla_nest_cancel(user_skb, nla); 493 } 494 495 /* Add OVS_PACKET_ATTR_MRU */ 496 if (upcall_info->mru && 497 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) { 498 err = -ENOBUFS; 499 goto out; 500 } 501 502 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */ 503 if (cutlen > 0 && 504 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) { 505 err = -ENOBUFS; 506 goto out; 507 } 508 509 /* Add OVS_PACKET_ATTR_HASH */ 510 hash = skb_get_hash_raw(skb); 511 if (skb->sw_hash) 512 hash |= OVS_PACKET_HASH_SW_BIT; 513 514 if (skb->l4_hash) 515 hash |= OVS_PACKET_HASH_L4_BIT; 516 517 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) { 518 err = -ENOBUFS; 519 goto out; 520 } 521 522 /* Only reserve room for attribute header, packet data is added 523 * in skb_zerocopy() */ 524 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 525 err = -ENOBUFS; 526 goto out; 527 } 528 nla->nla_len = nla_attr_size(skb->len - cutlen); 529 530 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen); 531 if (err) 532 goto out; 533 534 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 535 pad_packet(dp, user_skb); 536 537 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 538 539 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 540 user_skb = NULL; 541 out: 542 if (err) 543 skb_tx_error(skb); 544 kfree_skb(user_skb); 545 kfree_skb(nskb); 546 return err; 547 } 548 549 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 550 { 551 struct ovs_header *ovs_header = info->userhdr; 552 struct net *net = sock_net(skb->sk); 553 struct nlattr **a = info->attrs; 554 struct sw_flow_actions *acts; 555 struct sk_buff *packet; 556 struct sw_flow *flow; 557 struct sw_flow_actions *sf_acts; 558 struct datapath *dp; 559 struct vport *input_vport; 560 u16 mru = 0; 561 u64 hash; 562 int len; 563 int err; 564 bool log = !a[OVS_PACKET_ATTR_PROBE]; 565 566 err = -EINVAL; 567 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 568 !a[OVS_PACKET_ATTR_ACTIONS]) 569 goto err; 570 571 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 572 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 573 err = -ENOMEM; 574 if (!packet) 575 goto err; 576 skb_reserve(packet, NET_IP_ALIGN); 577 578 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 579 580 /* Set packet's mru */ 581 if (a[OVS_PACKET_ATTR_MRU]) { 582 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]); 583 packet->ignore_df = 1; 584 } 585 OVS_CB(packet)->mru = mru; 586 587 if (a[OVS_PACKET_ATTR_HASH]) { 588 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]); 589 590 __skb_set_hash(packet, hash & 0xFFFFFFFFULL, 591 !!(hash & OVS_PACKET_HASH_SW_BIT), 592 !!(hash & OVS_PACKET_HASH_L4_BIT)); 593 } 594 595 /* Build an sw_flow for sending this packet. */ 596 flow = ovs_flow_alloc(); 597 err = PTR_ERR(flow); 598 if (IS_ERR(flow)) 599 goto err_kfree_skb; 600 601 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY], 602 packet, &flow->key, log); 603 if (err) 604 goto err_flow_free; 605 606 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS], 607 &flow->key, &acts, log); 608 if (err) 609 goto err_flow_free; 610 611 rcu_assign_pointer(flow->sf_acts, acts); 612 packet->priority = flow->key.phy.priority; 613 packet->mark = flow->key.phy.skb_mark; 614 615 rcu_read_lock(); 616 dp = get_dp_rcu(net, ovs_header->dp_ifindex); 617 err = -ENODEV; 618 if (!dp) 619 goto err_unlock; 620 621 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 622 if (!input_vport) 623 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 624 625 if (!input_vport) 626 goto err_unlock; 627 628 packet->dev = input_vport->dev; 629 OVS_CB(packet)->input_vport = input_vport; 630 sf_acts = rcu_dereference(flow->sf_acts); 631 632 local_bh_disable(); 633 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); 634 local_bh_enable(); 635 rcu_read_unlock(); 636 637 ovs_flow_free(flow, false); 638 return err; 639 640 err_unlock: 641 rcu_read_unlock(); 642 err_flow_free: 643 ovs_flow_free(flow, false); 644 err_kfree_skb: 645 kfree_skb(packet); 646 err: 647 return err; 648 } 649 650 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 651 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 652 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 653 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 654 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, 655 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, 656 [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 }, 657 }; 658 659 static const struct genl_small_ops dp_packet_genl_ops[] = { 660 { .cmd = OVS_PACKET_CMD_EXECUTE, 661 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 662 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 663 .doit = ovs_packet_cmd_execute 664 } 665 }; 666 667 static struct genl_family dp_packet_genl_family __ro_after_init = { 668 .hdrsize = sizeof(struct ovs_header), 669 .name = OVS_PACKET_FAMILY, 670 .version = OVS_PACKET_VERSION, 671 .maxattr = OVS_PACKET_ATTR_MAX, 672 .policy = packet_policy, 673 .netnsok = true, 674 .parallel_ops = true, 675 .small_ops = dp_packet_genl_ops, 676 .n_small_ops = ARRAY_SIZE(dp_packet_genl_ops), 677 .module = THIS_MODULE, 678 }; 679 680 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 681 struct ovs_dp_megaflow_stats *mega_stats) 682 { 683 int i; 684 685 memset(mega_stats, 0, sizeof(*mega_stats)); 686 687 stats->n_flows = ovs_flow_tbl_count(&dp->table); 688 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 689 690 stats->n_hit = stats->n_missed = stats->n_lost = 0; 691 692 for_each_possible_cpu(i) { 693 const struct dp_stats_percpu *percpu_stats; 694 struct dp_stats_percpu local_stats; 695 unsigned int start; 696 697 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 698 699 do { 700 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 701 local_stats = *percpu_stats; 702 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 703 704 stats->n_hit += local_stats.n_hit; 705 stats->n_missed += local_stats.n_missed; 706 stats->n_lost += local_stats.n_lost; 707 mega_stats->n_mask_hit += local_stats.n_mask_hit; 708 mega_stats->n_cache_hit += local_stats.n_cache_hit; 709 } 710 } 711 712 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) 713 { 714 return ovs_identifier_is_ufid(sfid) && 715 !(ufid_flags & OVS_UFID_F_OMIT_KEY); 716 } 717 718 static bool should_fill_mask(uint32_t ufid_flags) 719 { 720 return !(ufid_flags & OVS_UFID_F_OMIT_MASK); 721 } 722 723 static bool should_fill_actions(uint32_t ufid_flags) 724 { 725 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); 726 } 727 728 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, 729 const struct sw_flow_id *sfid, 730 uint32_t ufid_flags) 731 { 732 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); 733 734 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback 735 * see ovs_nla_put_identifier() 736 */ 737 if (sfid && ovs_identifier_is_ufid(sfid)) 738 len += nla_total_size(sfid->ufid_len); 739 else 740 len += nla_total_size(ovs_key_attr_size()); 741 742 /* OVS_FLOW_ATTR_KEY */ 743 if (!sfid || should_fill_key(sfid, ufid_flags)) 744 len += nla_total_size(ovs_key_attr_size()); 745 746 /* OVS_FLOW_ATTR_MASK */ 747 if (should_fill_mask(ufid_flags)) 748 len += nla_total_size(ovs_key_attr_size()); 749 750 /* OVS_FLOW_ATTR_ACTIONS */ 751 if (should_fill_actions(ufid_flags)) 752 len += nla_total_size(acts->orig_len); 753 754 return len 755 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 756 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 757 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */ 758 } 759 760 /* Called with ovs_mutex or RCU read lock. */ 761 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 762 struct sk_buff *skb) 763 { 764 struct ovs_flow_stats stats; 765 __be16 tcp_flags; 766 unsigned long used; 767 768 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 769 770 if (used && 771 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used), 772 OVS_FLOW_ATTR_PAD)) 773 return -EMSGSIZE; 774 775 if (stats.n_packets && 776 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS, 777 sizeof(struct ovs_flow_stats), &stats, 778 OVS_FLOW_ATTR_PAD)) 779 return -EMSGSIZE; 780 781 if ((u8)ntohs(tcp_flags) && 782 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 783 return -EMSGSIZE; 784 785 return 0; 786 } 787 788 /* Called with ovs_mutex or RCU read lock. */ 789 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 790 struct sk_buff *skb, int skb_orig_len) 791 { 792 struct nlattr *start; 793 int err; 794 795 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 796 * this is the first flow to be dumped into 'skb'. This is unusual for 797 * Netlink but individual action lists can be longer than 798 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 799 * The userspace caller can always fetch the actions separately if it 800 * really wants them. (Most userspace callers in fact don't care.) 801 * 802 * This can only fail for dump operations because the skb is always 803 * properly sized for single flows. 804 */ 805 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS); 806 if (start) { 807 const struct sw_flow_actions *sf_acts; 808 809 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 810 err = ovs_nla_put_actions(sf_acts->actions, 811 sf_acts->actions_len, skb); 812 813 if (!err) 814 nla_nest_end(skb, start); 815 else { 816 if (skb_orig_len) 817 return err; 818 819 nla_nest_cancel(skb, start); 820 } 821 } else if (skb_orig_len) { 822 return -EMSGSIZE; 823 } 824 825 return 0; 826 } 827 828 /* Called with ovs_mutex or RCU read lock. */ 829 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 830 struct sk_buff *skb, u32 portid, 831 u32 seq, u32 flags, u8 cmd, u32 ufid_flags) 832 { 833 const int skb_orig_len = skb->len; 834 struct ovs_header *ovs_header; 835 int err; 836 837 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 838 flags, cmd); 839 if (!ovs_header) 840 return -EMSGSIZE; 841 842 ovs_header->dp_ifindex = dp_ifindex; 843 844 err = ovs_nla_put_identifier(flow, skb); 845 if (err) 846 goto error; 847 848 if (should_fill_key(&flow->id, ufid_flags)) { 849 err = ovs_nla_put_masked_key(flow, skb); 850 if (err) 851 goto error; 852 } 853 854 if (should_fill_mask(ufid_flags)) { 855 err = ovs_nla_put_mask(flow, skb); 856 if (err) 857 goto error; 858 } 859 860 err = ovs_flow_cmd_fill_stats(flow, skb); 861 if (err) 862 goto error; 863 864 if (should_fill_actions(ufid_flags)) { 865 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 866 if (err) 867 goto error; 868 } 869 870 genlmsg_end(skb, ovs_header); 871 return 0; 872 873 error: 874 genlmsg_cancel(skb, ovs_header); 875 return err; 876 } 877 878 /* May not be called with RCU read lock. */ 879 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 880 const struct sw_flow_id *sfid, 881 struct genl_info *info, 882 bool always, 883 uint32_t ufid_flags) 884 { 885 struct sk_buff *skb; 886 size_t len; 887 888 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 889 return NULL; 890 891 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); 892 skb = genlmsg_new(len, GFP_KERNEL); 893 if (!skb) 894 return ERR_PTR(-ENOMEM); 895 896 return skb; 897 } 898 899 /* Called with ovs_mutex. */ 900 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 901 int dp_ifindex, 902 struct genl_info *info, u8 cmd, 903 bool always, u32 ufid_flags) 904 { 905 struct sk_buff *skb; 906 int retval; 907 908 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), 909 &flow->id, info, always, ufid_flags); 910 if (IS_ERR_OR_NULL(skb)) 911 return skb; 912 913 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 914 info->snd_portid, info->snd_seq, 0, 915 cmd, ufid_flags); 916 if (WARN_ON_ONCE(retval < 0)) { 917 kfree_skb(skb); 918 skb = ERR_PTR(retval); 919 } 920 return skb; 921 } 922 923 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 924 { 925 struct net *net = sock_net(skb->sk); 926 struct nlattr **a = info->attrs; 927 struct ovs_header *ovs_header = info->userhdr; 928 struct sw_flow *flow = NULL, *new_flow; 929 struct sw_flow_mask mask; 930 struct sk_buff *reply; 931 struct datapath *dp; 932 struct sw_flow_actions *acts; 933 struct sw_flow_match match; 934 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 935 int error; 936 bool log = !a[OVS_FLOW_ATTR_PROBE]; 937 938 /* Must have key and actions. */ 939 error = -EINVAL; 940 if (!a[OVS_FLOW_ATTR_KEY]) { 941 OVS_NLERR(log, "Flow key attr not present in new flow."); 942 goto error; 943 } 944 if (!a[OVS_FLOW_ATTR_ACTIONS]) { 945 OVS_NLERR(log, "Flow actions attr not present in new flow."); 946 goto error; 947 } 948 949 /* Most of the time we need to allocate a new flow, do it before 950 * locking. 951 */ 952 new_flow = ovs_flow_alloc(); 953 if (IS_ERR(new_flow)) { 954 error = PTR_ERR(new_flow); 955 goto error; 956 } 957 958 /* Extract key. */ 959 ovs_match_init(&match, &new_flow->key, false, &mask); 960 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 961 a[OVS_FLOW_ATTR_MASK], log); 962 if (error) 963 goto err_kfree_flow; 964 965 /* Extract flow identifier. */ 966 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID], 967 &new_flow->key, log); 968 if (error) 969 goto err_kfree_flow; 970 971 /* unmasked key is needed to match when ufid is not used. */ 972 if (ovs_identifier_is_key(&new_flow->id)) 973 match.key = new_flow->id.unmasked_key; 974 975 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask); 976 977 /* Validate actions. */ 978 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS], 979 &new_flow->key, &acts, log); 980 if (error) { 981 OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); 982 goto err_kfree_flow; 983 } 984 985 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false, 986 ufid_flags); 987 if (IS_ERR(reply)) { 988 error = PTR_ERR(reply); 989 goto err_kfree_acts; 990 } 991 992 ovs_lock(); 993 dp = get_dp(net, ovs_header->dp_ifindex); 994 if (unlikely(!dp)) { 995 error = -ENODEV; 996 goto err_unlock_ovs; 997 } 998 999 /* Check if this is a duplicate flow */ 1000 if (ovs_identifier_is_ufid(&new_flow->id)) 1001 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id); 1002 if (!flow) 1003 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key); 1004 if (likely(!flow)) { 1005 rcu_assign_pointer(new_flow->sf_acts, acts); 1006 1007 /* Put flow in bucket. */ 1008 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 1009 if (unlikely(error)) { 1010 acts = NULL; 1011 goto err_unlock_ovs; 1012 } 1013 1014 if (unlikely(reply)) { 1015 error = ovs_flow_cmd_fill_info(new_flow, 1016 ovs_header->dp_ifindex, 1017 reply, info->snd_portid, 1018 info->snd_seq, 0, 1019 OVS_FLOW_CMD_NEW, 1020 ufid_flags); 1021 BUG_ON(error < 0); 1022 } 1023 ovs_unlock(); 1024 } else { 1025 struct sw_flow_actions *old_acts; 1026 1027 /* Bail out if we're not allowed to modify an existing flow. 1028 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 1029 * because Generic Netlink treats the latter as a dump 1030 * request. We also accept NLM_F_EXCL in case that bug ever 1031 * gets fixed. 1032 */ 1033 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 1034 | NLM_F_EXCL))) { 1035 error = -EEXIST; 1036 goto err_unlock_ovs; 1037 } 1038 /* The flow identifier has to be the same for flow updates. 1039 * Look for any overlapping flow. 1040 */ 1041 if (unlikely(!ovs_flow_cmp(flow, &match))) { 1042 if (ovs_identifier_is_key(&flow->id)) 1043 flow = ovs_flow_tbl_lookup_exact(&dp->table, 1044 &match); 1045 else /* UFID matches but key is different */ 1046 flow = NULL; 1047 if (!flow) { 1048 error = -ENOENT; 1049 goto err_unlock_ovs; 1050 } 1051 } 1052 /* Update actions. */ 1053 old_acts = ovsl_dereference(flow->sf_acts); 1054 rcu_assign_pointer(flow->sf_acts, acts); 1055 1056 if (unlikely(reply)) { 1057 error = ovs_flow_cmd_fill_info(flow, 1058 ovs_header->dp_ifindex, 1059 reply, info->snd_portid, 1060 info->snd_seq, 0, 1061 OVS_FLOW_CMD_NEW, 1062 ufid_flags); 1063 BUG_ON(error < 0); 1064 } 1065 ovs_unlock(); 1066 1067 ovs_nla_free_flow_actions_rcu(old_acts); 1068 ovs_flow_free(new_flow, false); 1069 } 1070 1071 if (reply) 1072 ovs_notify(&dp_flow_genl_family, reply, info); 1073 return 0; 1074 1075 err_unlock_ovs: 1076 ovs_unlock(); 1077 kfree_skb(reply); 1078 err_kfree_acts: 1079 ovs_nla_free_flow_actions(acts); 1080 err_kfree_flow: 1081 ovs_flow_free(new_flow, false); 1082 error: 1083 return error; 1084 } 1085 1086 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ 1087 static noinline_for_stack 1088 struct sw_flow_actions *get_flow_actions(struct net *net, 1089 const struct nlattr *a, 1090 const struct sw_flow_key *key, 1091 const struct sw_flow_mask *mask, 1092 bool log) 1093 { 1094 struct sw_flow_actions *acts; 1095 struct sw_flow_key masked_key; 1096 int error; 1097 1098 ovs_flow_mask_key(&masked_key, key, true, mask); 1099 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log); 1100 if (error) { 1101 OVS_NLERR(log, 1102 "Actions may not be safe on all matching packets"); 1103 return ERR_PTR(error); 1104 } 1105 1106 return acts; 1107 } 1108 1109 /* Factor out match-init and action-copy to avoid 1110 * "Wframe-larger-than=1024" warning. Because mask is only 1111 * used to get actions, we new a function to save some 1112 * stack space. 1113 * 1114 * If there are not key and action attrs, we return 0 1115 * directly. In the case, the caller will also not use the 1116 * match as before. If there is action attr, we try to get 1117 * actions and save them to *acts. Before returning from 1118 * the function, we reset the match->mask pointer. Because 1119 * we should not to return match object with dangling reference 1120 * to mask. 1121 * */ 1122 static noinline_for_stack int 1123 ovs_nla_init_match_and_action(struct net *net, 1124 struct sw_flow_match *match, 1125 struct sw_flow_key *key, 1126 struct nlattr **a, 1127 struct sw_flow_actions **acts, 1128 bool log) 1129 { 1130 struct sw_flow_mask mask; 1131 int error = 0; 1132 1133 if (a[OVS_FLOW_ATTR_KEY]) { 1134 ovs_match_init(match, key, true, &mask); 1135 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY], 1136 a[OVS_FLOW_ATTR_MASK], log); 1137 if (error) 1138 goto error; 1139 } 1140 1141 if (a[OVS_FLOW_ATTR_ACTIONS]) { 1142 if (!a[OVS_FLOW_ATTR_KEY]) { 1143 OVS_NLERR(log, 1144 "Flow key attribute not present in set flow."); 1145 error = -EINVAL; 1146 goto error; 1147 } 1148 1149 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key, 1150 &mask, log); 1151 if (IS_ERR(*acts)) { 1152 error = PTR_ERR(*acts); 1153 goto error; 1154 } 1155 } 1156 1157 /* On success, error is 0. */ 1158 error: 1159 match->mask = NULL; 1160 return error; 1161 } 1162 1163 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 1164 { 1165 struct net *net = sock_net(skb->sk); 1166 struct nlattr **a = info->attrs; 1167 struct ovs_header *ovs_header = info->userhdr; 1168 struct sw_flow_key key; 1169 struct sw_flow *flow; 1170 struct sk_buff *reply = NULL; 1171 struct datapath *dp; 1172 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 1173 struct sw_flow_match match; 1174 struct sw_flow_id sfid; 1175 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1176 int error = 0; 1177 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1178 bool ufid_present; 1179 1180 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); 1181 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) { 1182 OVS_NLERR(log, 1183 "Flow set message rejected, Key attribute missing."); 1184 return -EINVAL; 1185 } 1186 1187 error = ovs_nla_init_match_and_action(net, &match, &key, a, 1188 &acts, log); 1189 if (error) 1190 goto error; 1191 1192 if (acts) { 1193 /* Can allocate before locking if have acts. */ 1194 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false, 1195 ufid_flags); 1196 if (IS_ERR(reply)) { 1197 error = PTR_ERR(reply); 1198 goto err_kfree_acts; 1199 } 1200 } 1201 1202 ovs_lock(); 1203 dp = get_dp(net, ovs_header->dp_ifindex); 1204 if (unlikely(!dp)) { 1205 error = -ENODEV; 1206 goto err_unlock_ovs; 1207 } 1208 /* Check that the flow exists. */ 1209 if (ufid_present) 1210 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid); 1211 else 1212 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1213 if (unlikely(!flow)) { 1214 error = -ENOENT; 1215 goto err_unlock_ovs; 1216 } 1217 1218 /* Update actions, if present. */ 1219 if (likely(acts)) { 1220 old_acts = ovsl_dereference(flow->sf_acts); 1221 rcu_assign_pointer(flow->sf_acts, acts); 1222 1223 if (unlikely(reply)) { 1224 error = ovs_flow_cmd_fill_info(flow, 1225 ovs_header->dp_ifindex, 1226 reply, info->snd_portid, 1227 info->snd_seq, 0, 1228 OVS_FLOW_CMD_SET, 1229 ufid_flags); 1230 BUG_ON(error < 0); 1231 } 1232 } else { 1233 /* Could not alloc without acts before locking. */ 1234 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1235 info, OVS_FLOW_CMD_SET, false, 1236 ufid_flags); 1237 1238 if (IS_ERR(reply)) { 1239 error = PTR_ERR(reply); 1240 goto err_unlock_ovs; 1241 } 1242 } 1243 1244 /* Clear stats. */ 1245 if (a[OVS_FLOW_ATTR_CLEAR]) 1246 ovs_flow_stats_clear(flow); 1247 ovs_unlock(); 1248 1249 if (reply) 1250 ovs_notify(&dp_flow_genl_family, reply, info); 1251 if (old_acts) 1252 ovs_nla_free_flow_actions_rcu(old_acts); 1253 1254 return 0; 1255 1256 err_unlock_ovs: 1257 ovs_unlock(); 1258 kfree_skb(reply); 1259 err_kfree_acts: 1260 ovs_nla_free_flow_actions(acts); 1261 error: 1262 return error; 1263 } 1264 1265 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1266 { 1267 struct nlattr **a = info->attrs; 1268 struct ovs_header *ovs_header = info->userhdr; 1269 struct net *net = sock_net(skb->sk); 1270 struct sw_flow_key key; 1271 struct sk_buff *reply; 1272 struct sw_flow *flow; 1273 struct datapath *dp; 1274 struct sw_flow_match match; 1275 struct sw_flow_id ufid; 1276 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1277 int err = 0; 1278 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1279 bool ufid_present; 1280 1281 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1282 if (a[OVS_FLOW_ATTR_KEY]) { 1283 ovs_match_init(&match, &key, true, NULL); 1284 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL, 1285 log); 1286 } else if (!ufid_present) { 1287 OVS_NLERR(log, 1288 "Flow get message rejected, Key attribute missing."); 1289 err = -EINVAL; 1290 } 1291 if (err) 1292 return err; 1293 1294 ovs_lock(); 1295 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1296 if (!dp) { 1297 err = -ENODEV; 1298 goto unlock; 1299 } 1300 1301 if (ufid_present) 1302 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1303 else 1304 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1305 if (!flow) { 1306 err = -ENOENT; 1307 goto unlock; 1308 } 1309 1310 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1311 OVS_FLOW_CMD_GET, true, ufid_flags); 1312 if (IS_ERR(reply)) { 1313 err = PTR_ERR(reply); 1314 goto unlock; 1315 } 1316 1317 ovs_unlock(); 1318 return genlmsg_reply(reply, info); 1319 unlock: 1320 ovs_unlock(); 1321 return err; 1322 } 1323 1324 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1325 { 1326 struct nlattr **a = info->attrs; 1327 struct ovs_header *ovs_header = info->userhdr; 1328 struct net *net = sock_net(skb->sk); 1329 struct sw_flow_key key; 1330 struct sk_buff *reply; 1331 struct sw_flow *flow = NULL; 1332 struct datapath *dp; 1333 struct sw_flow_match match; 1334 struct sw_flow_id ufid; 1335 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1336 int err; 1337 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1338 bool ufid_present; 1339 1340 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1341 if (a[OVS_FLOW_ATTR_KEY]) { 1342 ovs_match_init(&match, &key, true, NULL); 1343 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1344 NULL, log); 1345 if (unlikely(err)) 1346 return err; 1347 } 1348 1349 ovs_lock(); 1350 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1351 if (unlikely(!dp)) { 1352 err = -ENODEV; 1353 goto unlock; 1354 } 1355 1356 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) { 1357 err = ovs_flow_tbl_flush(&dp->table); 1358 goto unlock; 1359 } 1360 1361 if (ufid_present) 1362 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1363 else 1364 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1365 if (unlikely(!flow)) { 1366 err = -ENOENT; 1367 goto unlock; 1368 } 1369 1370 ovs_flow_tbl_remove(&dp->table, flow); 1371 ovs_unlock(); 1372 1373 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1374 &flow->id, info, false, ufid_flags); 1375 if (likely(reply)) { 1376 if (!IS_ERR(reply)) { 1377 rcu_read_lock(); /*To keep RCU checker happy. */ 1378 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1379 reply, info->snd_portid, 1380 info->snd_seq, 0, 1381 OVS_FLOW_CMD_DEL, 1382 ufid_flags); 1383 rcu_read_unlock(); 1384 if (WARN_ON_ONCE(err < 0)) { 1385 kfree_skb(reply); 1386 goto out_free; 1387 } 1388 1389 ovs_notify(&dp_flow_genl_family, reply, info); 1390 } else { 1391 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, 1392 PTR_ERR(reply)); 1393 } 1394 } 1395 1396 out_free: 1397 ovs_flow_free(flow, true); 1398 return 0; 1399 unlock: 1400 ovs_unlock(); 1401 return err; 1402 } 1403 1404 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1405 { 1406 struct nlattr *a[__OVS_FLOW_ATTR_MAX]; 1407 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1408 struct table_instance *ti; 1409 struct datapath *dp; 1410 u32 ufid_flags; 1411 int err; 1412 1413 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a, 1414 OVS_FLOW_ATTR_MAX, flow_policy, NULL); 1415 if (err) 1416 return err; 1417 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1418 1419 rcu_read_lock(); 1420 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1421 if (!dp) { 1422 rcu_read_unlock(); 1423 return -ENODEV; 1424 } 1425 1426 ti = rcu_dereference(dp->table.ti); 1427 for (;;) { 1428 struct sw_flow *flow; 1429 u32 bucket, obj; 1430 1431 bucket = cb->args[0]; 1432 obj = cb->args[1]; 1433 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1434 if (!flow) 1435 break; 1436 1437 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1438 NETLINK_CB(cb->skb).portid, 1439 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1440 OVS_FLOW_CMD_GET, ufid_flags) < 0) 1441 break; 1442 1443 cb->args[0] = bucket; 1444 cb->args[1] = obj; 1445 } 1446 rcu_read_unlock(); 1447 return skb->len; 1448 } 1449 1450 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1451 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1452 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1453 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1454 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1455 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1456 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, 1457 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, 1458 }; 1459 1460 static const struct genl_small_ops dp_flow_genl_ops[] = { 1461 { .cmd = OVS_FLOW_CMD_NEW, 1462 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1463 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1464 .doit = ovs_flow_cmd_new 1465 }, 1466 { .cmd = OVS_FLOW_CMD_DEL, 1467 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1468 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1469 .doit = ovs_flow_cmd_del 1470 }, 1471 { .cmd = OVS_FLOW_CMD_GET, 1472 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1473 .flags = 0, /* OK for unprivileged users. */ 1474 .doit = ovs_flow_cmd_get, 1475 .dumpit = ovs_flow_cmd_dump 1476 }, 1477 { .cmd = OVS_FLOW_CMD_SET, 1478 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1479 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1480 .doit = ovs_flow_cmd_set, 1481 }, 1482 }; 1483 1484 static struct genl_family dp_flow_genl_family __ro_after_init = { 1485 .hdrsize = sizeof(struct ovs_header), 1486 .name = OVS_FLOW_FAMILY, 1487 .version = OVS_FLOW_VERSION, 1488 .maxattr = OVS_FLOW_ATTR_MAX, 1489 .policy = flow_policy, 1490 .netnsok = true, 1491 .parallel_ops = true, 1492 .small_ops = dp_flow_genl_ops, 1493 .n_small_ops = ARRAY_SIZE(dp_flow_genl_ops), 1494 .mcgrps = &ovs_dp_flow_multicast_group, 1495 .n_mcgrps = 1, 1496 .module = THIS_MODULE, 1497 }; 1498 1499 static size_t ovs_dp_cmd_msg_size(void) 1500 { 1501 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1502 1503 msgsize += nla_total_size(IFNAMSIZ); 1504 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats)); 1505 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats)); 1506 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1507 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */ 1508 1509 return msgsize; 1510 } 1511 1512 /* Called with ovs_mutex. */ 1513 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1514 u32 portid, u32 seq, u32 flags, u8 cmd) 1515 { 1516 struct ovs_header *ovs_header; 1517 struct ovs_dp_stats dp_stats; 1518 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1519 int err; 1520 1521 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1522 flags, cmd); 1523 if (!ovs_header) 1524 goto error; 1525 1526 ovs_header->dp_ifindex = get_dpifindex(dp); 1527 1528 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1529 if (err) 1530 goto nla_put_failure; 1531 1532 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1533 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1534 &dp_stats, OVS_DP_ATTR_PAD)) 1535 goto nla_put_failure; 1536 1537 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1538 sizeof(struct ovs_dp_megaflow_stats), 1539 &dp_megaflow_stats, OVS_DP_ATTR_PAD)) 1540 goto nla_put_failure; 1541 1542 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1543 goto nla_put_failure; 1544 1545 if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE, 1546 ovs_flow_tbl_masks_cache_size(&dp->table))) 1547 goto nla_put_failure; 1548 1549 genlmsg_end(skb, ovs_header); 1550 return 0; 1551 1552 nla_put_failure: 1553 genlmsg_cancel(skb, ovs_header); 1554 error: 1555 return -EMSGSIZE; 1556 } 1557 1558 static struct sk_buff *ovs_dp_cmd_alloc_info(void) 1559 { 1560 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL); 1561 } 1562 1563 /* Called with rcu_read_lock or ovs_mutex. */ 1564 static struct datapath *lookup_datapath(struct net *net, 1565 const struct ovs_header *ovs_header, 1566 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1567 { 1568 struct datapath *dp; 1569 1570 if (!a[OVS_DP_ATTR_NAME]) 1571 dp = get_dp(net, ovs_header->dp_ifindex); 1572 else { 1573 struct vport *vport; 1574 1575 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1576 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1577 } 1578 return dp ? dp : ERR_PTR(-ENODEV); 1579 } 1580 1581 static void ovs_dp_reset_user_features(struct sk_buff *skb, 1582 struct genl_info *info) 1583 { 1584 struct datapath *dp; 1585 1586 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, 1587 info->attrs); 1588 if (IS_ERR(dp)) 1589 return; 1590 1591 WARN(dp->user_features, "Dropping previously announced user features\n"); 1592 dp->user_features = 0; 1593 } 1594 1595 DEFINE_STATIC_KEY_FALSE(tc_recirc_sharing_support); 1596 1597 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1598 { 1599 u32 user_features = 0; 1600 1601 if (a[OVS_DP_ATTR_USER_FEATURES]) { 1602 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1603 1604 if (user_features & ~(OVS_DP_F_VPORT_PIDS | 1605 OVS_DP_F_UNALIGNED | 1606 OVS_DP_F_TC_RECIRC_SHARING)) 1607 return -EOPNOTSUPP; 1608 1609 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT) 1610 if (user_features & OVS_DP_F_TC_RECIRC_SHARING) 1611 return -EOPNOTSUPP; 1612 #endif 1613 } 1614 1615 if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) { 1616 int err; 1617 u32 cache_size; 1618 1619 cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]); 1620 err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size); 1621 if (err) 1622 return err; 1623 } 1624 1625 dp->user_features = user_features; 1626 1627 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) 1628 static_branch_enable(&tc_recirc_sharing_support); 1629 else 1630 static_branch_disable(&tc_recirc_sharing_support); 1631 1632 return 0; 1633 } 1634 1635 static int ovs_dp_stats_init(struct datapath *dp) 1636 { 1637 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1638 if (!dp->stats_percpu) 1639 return -ENOMEM; 1640 1641 return 0; 1642 } 1643 1644 static int ovs_dp_vport_init(struct datapath *dp) 1645 { 1646 int i; 1647 1648 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS, 1649 sizeof(struct hlist_head), 1650 GFP_KERNEL); 1651 if (!dp->ports) 1652 return -ENOMEM; 1653 1654 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1655 INIT_HLIST_HEAD(&dp->ports[i]); 1656 1657 return 0; 1658 } 1659 1660 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1661 { 1662 struct nlattr **a = info->attrs; 1663 struct vport_parms parms; 1664 struct sk_buff *reply; 1665 struct datapath *dp; 1666 struct vport *vport; 1667 struct ovs_net *ovs_net; 1668 int err; 1669 1670 err = -EINVAL; 1671 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1672 goto err; 1673 1674 reply = ovs_dp_cmd_alloc_info(); 1675 if (!reply) 1676 return -ENOMEM; 1677 1678 err = -ENOMEM; 1679 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1680 if (dp == NULL) 1681 goto err_destroy_reply; 1682 1683 ovs_dp_set_net(dp, sock_net(skb->sk)); 1684 1685 /* Allocate table. */ 1686 err = ovs_flow_tbl_init(&dp->table); 1687 if (err) 1688 goto err_destroy_dp; 1689 1690 err = ovs_dp_stats_init(dp); 1691 if (err) 1692 goto err_destroy_table; 1693 1694 err = ovs_dp_vport_init(dp); 1695 if (err) 1696 goto err_destroy_stats; 1697 1698 err = ovs_meters_init(dp); 1699 if (err) 1700 goto err_destroy_ports; 1701 1702 /* Set up our datapath device. */ 1703 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1704 parms.type = OVS_VPORT_TYPE_INTERNAL; 1705 parms.options = NULL; 1706 parms.dp = dp; 1707 parms.port_no = OVSP_LOCAL; 1708 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1709 1710 /* So far only local changes have been made, now need the lock. */ 1711 ovs_lock(); 1712 1713 err = ovs_dp_change(dp, a); 1714 if (err) 1715 goto err_unlock_and_destroy_meters; 1716 1717 vport = new_vport(&parms); 1718 if (IS_ERR(vport)) { 1719 err = PTR_ERR(vport); 1720 if (err == -EBUSY) 1721 err = -EEXIST; 1722 1723 if (err == -EEXIST) { 1724 /* An outdated user space instance that does not understand 1725 * the concept of user_features has attempted to create a new 1726 * datapath and is likely to reuse it. Drop all user features. 1727 */ 1728 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1729 ovs_dp_reset_user_features(skb, info); 1730 } 1731 1732 goto err_unlock_and_destroy_meters; 1733 } 1734 1735 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1736 info->snd_seq, 0, OVS_DP_CMD_NEW); 1737 BUG_ON(err < 0); 1738 1739 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1740 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1741 1742 ovs_unlock(); 1743 1744 ovs_notify(&dp_datapath_genl_family, reply, info); 1745 return 0; 1746 1747 err_unlock_and_destroy_meters: 1748 ovs_unlock(); 1749 ovs_meters_exit(dp); 1750 err_destroy_ports: 1751 kfree(dp->ports); 1752 err_destroy_stats: 1753 free_percpu(dp->stats_percpu); 1754 err_destroy_table: 1755 ovs_flow_tbl_destroy(&dp->table); 1756 err_destroy_dp: 1757 kfree(dp); 1758 err_destroy_reply: 1759 kfree_skb(reply); 1760 err: 1761 return err; 1762 } 1763 1764 /* Called with ovs_mutex. */ 1765 static void __dp_destroy(struct datapath *dp) 1766 { 1767 struct flow_table *table = &dp->table; 1768 int i; 1769 1770 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1771 struct vport *vport; 1772 struct hlist_node *n; 1773 1774 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1775 if (vport->port_no != OVSP_LOCAL) 1776 ovs_dp_detach_port(vport); 1777 } 1778 1779 list_del_rcu(&dp->list_node); 1780 1781 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1782 * all ports in datapath are destroyed first before freeing datapath. 1783 */ 1784 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1785 1786 /* Flush sw_flow in the tables. RCU cb only releases resource 1787 * such as dp, ports and tables. That may avoid some issues 1788 * such as RCU usage warning. 1789 */ 1790 table_instance_flow_flush(table, ovsl_dereference(table->ti), 1791 ovsl_dereference(table->ufid_ti)); 1792 1793 /* RCU destroy the ports, meters and flow tables. */ 1794 call_rcu(&dp->rcu, destroy_dp_rcu); 1795 } 1796 1797 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1798 { 1799 struct sk_buff *reply; 1800 struct datapath *dp; 1801 int err; 1802 1803 reply = ovs_dp_cmd_alloc_info(); 1804 if (!reply) 1805 return -ENOMEM; 1806 1807 ovs_lock(); 1808 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1809 err = PTR_ERR(dp); 1810 if (IS_ERR(dp)) 1811 goto err_unlock_free; 1812 1813 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1814 info->snd_seq, 0, OVS_DP_CMD_DEL); 1815 BUG_ON(err < 0); 1816 1817 __dp_destroy(dp); 1818 ovs_unlock(); 1819 1820 ovs_notify(&dp_datapath_genl_family, reply, info); 1821 1822 return 0; 1823 1824 err_unlock_free: 1825 ovs_unlock(); 1826 kfree_skb(reply); 1827 return err; 1828 } 1829 1830 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1831 { 1832 struct sk_buff *reply; 1833 struct datapath *dp; 1834 int err; 1835 1836 reply = ovs_dp_cmd_alloc_info(); 1837 if (!reply) 1838 return -ENOMEM; 1839 1840 ovs_lock(); 1841 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1842 err = PTR_ERR(dp); 1843 if (IS_ERR(dp)) 1844 goto err_unlock_free; 1845 1846 err = ovs_dp_change(dp, info->attrs); 1847 if (err) 1848 goto err_unlock_free; 1849 1850 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1851 info->snd_seq, 0, OVS_DP_CMD_SET); 1852 BUG_ON(err < 0); 1853 1854 ovs_unlock(); 1855 ovs_notify(&dp_datapath_genl_family, reply, info); 1856 1857 return 0; 1858 1859 err_unlock_free: 1860 ovs_unlock(); 1861 kfree_skb(reply); 1862 return err; 1863 } 1864 1865 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1866 { 1867 struct sk_buff *reply; 1868 struct datapath *dp; 1869 int err; 1870 1871 reply = ovs_dp_cmd_alloc_info(); 1872 if (!reply) 1873 return -ENOMEM; 1874 1875 ovs_lock(); 1876 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1877 if (IS_ERR(dp)) { 1878 err = PTR_ERR(dp); 1879 goto err_unlock_free; 1880 } 1881 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1882 info->snd_seq, 0, OVS_DP_CMD_GET); 1883 BUG_ON(err < 0); 1884 ovs_unlock(); 1885 1886 return genlmsg_reply(reply, info); 1887 1888 err_unlock_free: 1889 ovs_unlock(); 1890 kfree_skb(reply); 1891 return err; 1892 } 1893 1894 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1895 { 1896 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1897 struct datapath *dp; 1898 int skip = cb->args[0]; 1899 int i = 0; 1900 1901 ovs_lock(); 1902 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1903 if (i >= skip && 1904 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1905 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1906 OVS_DP_CMD_GET) < 0) 1907 break; 1908 i++; 1909 } 1910 ovs_unlock(); 1911 1912 cb->args[0] = i; 1913 1914 return skb->len; 1915 } 1916 1917 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1918 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1919 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1920 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1921 [OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0, 1922 PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)), 1923 }; 1924 1925 static const struct genl_small_ops dp_datapath_genl_ops[] = { 1926 { .cmd = OVS_DP_CMD_NEW, 1927 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1928 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1929 .doit = ovs_dp_cmd_new 1930 }, 1931 { .cmd = OVS_DP_CMD_DEL, 1932 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1933 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1934 .doit = ovs_dp_cmd_del 1935 }, 1936 { .cmd = OVS_DP_CMD_GET, 1937 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1938 .flags = 0, /* OK for unprivileged users. */ 1939 .doit = ovs_dp_cmd_get, 1940 .dumpit = ovs_dp_cmd_dump 1941 }, 1942 { .cmd = OVS_DP_CMD_SET, 1943 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1944 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1945 .doit = ovs_dp_cmd_set, 1946 }, 1947 }; 1948 1949 static struct genl_family dp_datapath_genl_family __ro_after_init = { 1950 .hdrsize = sizeof(struct ovs_header), 1951 .name = OVS_DATAPATH_FAMILY, 1952 .version = OVS_DATAPATH_VERSION, 1953 .maxattr = OVS_DP_ATTR_MAX, 1954 .policy = datapath_policy, 1955 .netnsok = true, 1956 .parallel_ops = true, 1957 .small_ops = dp_datapath_genl_ops, 1958 .n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops), 1959 .mcgrps = &ovs_dp_datapath_multicast_group, 1960 .n_mcgrps = 1, 1961 .module = THIS_MODULE, 1962 }; 1963 1964 /* Called with ovs_mutex or RCU read lock. */ 1965 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1966 struct net *net, u32 portid, u32 seq, 1967 u32 flags, u8 cmd, gfp_t gfp) 1968 { 1969 struct ovs_header *ovs_header; 1970 struct ovs_vport_stats vport_stats; 1971 int err; 1972 1973 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1974 flags, cmd); 1975 if (!ovs_header) 1976 return -EMSGSIZE; 1977 1978 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1979 1980 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1981 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1982 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 1983 ovs_vport_name(vport)) || 1984 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex)) 1985 goto nla_put_failure; 1986 1987 if (!net_eq(net, dev_net(vport->dev))) { 1988 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp); 1989 1990 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id)) 1991 goto nla_put_failure; 1992 } 1993 1994 ovs_vport_get_stats(vport, &vport_stats); 1995 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS, 1996 sizeof(struct ovs_vport_stats), &vport_stats, 1997 OVS_VPORT_ATTR_PAD)) 1998 goto nla_put_failure; 1999 2000 if (ovs_vport_get_upcall_portids(vport, skb)) 2001 goto nla_put_failure; 2002 2003 err = ovs_vport_get_options(vport, skb); 2004 if (err == -EMSGSIZE) 2005 goto error; 2006 2007 genlmsg_end(skb, ovs_header); 2008 return 0; 2009 2010 nla_put_failure: 2011 err = -EMSGSIZE; 2012 error: 2013 genlmsg_cancel(skb, ovs_header); 2014 return err; 2015 } 2016 2017 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 2018 { 2019 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2020 } 2021 2022 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 2023 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net, 2024 u32 portid, u32 seq, u8 cmd) 2025 { 2026 struct sk_buff *skb; 2027 int retval; 2028 2029 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2030 if (!skb) 2031 return ERR_PTR(-ENOMEM); 2032 2033 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd, 2034 GFP_KERNEL); 2035 BUG_ON(retval < 0); 2036 2037 return skb; 2038 } 2039 2040 /* Called with ovs_mutex or RCU read lock. */ 2041 static struct vport *lookup_vport(struct net *net, 2042 const struct ovs_header *ovs_header, 2043 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 2044 { 2045 struct datapath *dp; 2046 struct vport *vport; 2047 2048 if (a[OVS_VPORT_ATTR_IFINDEX]) 2049 return ERR_PTR(-EOPNOTSUPP); 2050 if (a[OVS_VPORT_ATTR_NAME]) { 2051 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 2052 if (!vport) 2053 return ERR_PTR(-ENODEV); 2054 if (ovs_header->dp_ifindex && 2055 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 2056 return ERR_PTR(-ENODEV); 2057 return vport; 2058 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 2059 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 2060 2061 if (port_no >= DP_MAX_PORTS) 2062 return ERR_PTR(-EFBIG); 2063 2064 dp = get_dp(net, ovs_header->dp_ifindex); 2065 if (!dp) 2066 return ERR_PTR(-ENODEV); 2067 2068 vport = ovs_vport_ovsl_rcu(dp, port_no); 2069 if (!vport) 2070 return ERR_PTR(-ENODEV); 2071 return vport; 2072 } else 2073 return ERR_PTR(-EINVAL); 2074 2075 } 2076 2077 static unsigned int ovs_get_max_headroom(struct datapath *dp) 2078 { 2079 unsigned int dev_headroom, max_headroom = 0; 2080 struct net_device *dev; 2081 struct vport *vport; 2082 int i; 2083 2084 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2085 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, 2086 lockdep_ovsl_is_held()) { 2087 dev = vport->dev; 2088 dev_headroom = netdev_get_fwd_headroom(dev); 2089 if (dev_headroom > max_headroom) 2090 max_headroom = dev_headroom; 2091 } 2092 } 2093 2094 return max_headroom; 2095 } 2096 2097 /* Called with ovs_mutex */ 2098 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom) 2099 { 2100 struct vport *vport; 2101 int i; 2102 2103 dp->max_headroom = new_headroom; 2104 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2105 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, 2106 lockdep_ovsl_is_held()) 2107 netdev_set_rx_headroom(vport->dev, new_headroom); 2108 } 2109 } 2110 2111 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 2112 { 2113 struct nlattr **a = info->attrs; 2114 struct ovs_header *ovs_header = info->userhdr; 2115 struct vport_parms parms; 2116 struct sk_buff *reply; 2117 struct vport *vport; 2118 struct datapath *dp; 2119 unsigned int new_headroom; 2120 u32 port_no; 2121 int err; 2122 2123 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 2124 !a[OVS_VPORT_ATTR_UPCALL_PID]) 2125 return -EINVAL; 2126 if (a[OVS_VPORT_ATTR_IFINDEX]) 2127 return -EOPNOTSUPP; 2128 2129 port_no = a[OVS_VPORT_ATTR_PORT_NO] 2130 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 2131 if (port_no >= DP_MAX_PORTS) 2132 return -EFBIG; 2133 2134 reply = ovs_vport_cmd_alloc_info(); 2135 if (!reply) 2136 return -ENOMEM; 2137 2138 ovs_lock(); 2139 restart: 2140 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 2141 err = -ENODEV; 2142 if (!dp) 2143 goto exit_unlock_free; 2144 2145 if (port_no) { 2146 vport = ovs_vport_ovsl(dp, port_no); 2147 err = -EBUSY; 2148 if (vport) 2149 goto exit_unlock_free; 2150 } else { 2151 for (port_no = 1; ; port_no++) { 2152 if (port_no >= DP_MAX_PORTS) { 2153 err = -EFBIG; 2154 goto exit_unlock_free; 2155 } 2156 vport = ovs_vport_ovsl(dp, port_no); 2157 if (!vport) 2158 break; 2159 } 2160 } 2161 2162 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 2163 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 2164 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 2165 parms.dp = dp; 2166 parms.port_no = port_no; 2167 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2168 2169 vport = new_vport(&parms); 2170 err = PTR_ERR(vport); 2171 if (IS_ERR(vport)) { 2172 if (err == -EAGAIN) 2173 goto restart; 2174 goto exit_unlock_free; 2175 } 2176 2177 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2178 info->snd_portid, info->snd_seq, 0, 2179 OVS_VPORT_CMD_NEW, GFP_KERNEL); 2180 2181 new_headroom = netdev_get_fwd_headroom(vport->dev); 2182 2183 if (new_headroom > dp->max_headroom) 2184 ovs_update_headroom(dp, new_headroom); 2185 else 2186 netdev_set_rx_headroom(vport->dev, dp->max_headroom); 2187 2188 BUG_ON(err < 0); 2189 ovs_unlock(); 2190 2191 ovs_notify(&dp_vport_genl_family, reply, info); 2192 return 0; 2193 2194 exit_unlock_free: 2195 ovs_unlock(); 2196 kfree_skb(reply); 2197 return err; 2198 } 2199 2200 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 2201 { 2202 struct nlattr **a = info->attrs; 2203 struct sk_buff *reply; 2204 struct vport *vport; 2205 int err; 2206 2207 reply = ovs_vport_cmd_alloc_info(); 2208 if (!reply) 2209 return -ENOMEM; 2210 2211 ovs_lock(); 2212 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2213 err = PTR_ERR(vport); 2214 if (IS_ERR(vport)) 2215 goto exit_unlock_free; 2216 2217 if (a[OVS_VPORT_ATTR_TYPE] && 2218 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 2219 err = -EINVAL; 2220 goto exit_unlock_free; 2221 } 2222 2223 if (a[OVS_VPORT_ATTR_OPTIONS]) { 2224 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 2225 if (err) 2226 goto exit_unlock_free; 2227 } 2228 2229 2230 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 2231 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2232 2233 err = ovs_vport_set_upcall_portids(vport, ids); 2234 if (err) 2235 goto exit_unlock_free; 2236 } 2237 2238 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2239 info->snd_portid, info->snd_seq, 0, 2240 OVS_VPORT_CMD_SET, GFP_KERNEL); 2241 BUG_ON(err < 0); 2242 2243 ovs_unlock(); 2244 ovs_notify(&dp_vport_genl_family, reply, info); 2245 return 0; 2246 2247 exit_unlock_free: 2248 ovs_unlock(); 2249 kfree_skb(reply); 2250 return err; 2251 } 2252 2253 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2254 { 2255 bool update_headroom = false; 2256 struct nlattr **a = info->attrs; 2257 struct sk_buff *reply; 2258 struct datapath *dp; 2259 struct vport *vport; 2260 unsigned int new_headroom; 2261 int err; 2262 2263 reply = ovs_vport_cmd_alloc_info(); 2264 if (!reply) 2265 return -ENOMEM; 2266 2267 ovs_lock(); 2268 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2269 err = PTR_ERR(vport); 2270 if (IS_ERR(vport)) 2271 goto exit_unlock_free; 2272 2273 if (vport->port_no == OVSP_LOCAL) { 2274 err = -EINVAL; 2275 goto exit_unlock_free; 2276 } 2277 2278 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2279 info->snd_portid, info->snd_seq, 0, 2280 OVS_VPORT_CMD_DEL, GFP_KERNEL); 2281 BUG_ON(err < 0); 2282 2283 /* the vport deletion may trigger dp headroom update */ 2284 dp = vport->dp; 2285 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom) 2286 update_headroom = true; 2287 2288 netdev_reset_rx_headroom(vport->dev); 2289 ovs_dp_detach_port(vport); 2290 2291 if (update_headroom) { 2292 new_headroom = ovs_get_max_headroom(dp); 2293 2294 if (new_headroom < dp->max_headroom) 2295 ovs_update_headroom(dp, new_headroom); 2296 } 2297 ovs_unlock(); 2298 2299 ovs_notify(&dp_vport_genl_family, reply, info); 2300 return 0; 2301 2302 exit_unlock_free: 2303 ovs_unlock(); 2304 kfree_skb(reply); 2305 return err; 2306 } 2307 2308 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2309 { 2310 struct nlattr **a = info->attrs; 2311 struct ovs_header *ovs_header = info->userhdr; 2312 struct sk_buff *reply; 2313 struct vport *vport; 2314 int err; 2315 2316 reply = ovs_vport_cmd_alloc_info(); 2317 if (!reply) 2318 return -ENOMEM; 2319 2320 rcu_read_lock(); 2321 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2322 err = PTR_ERR(vport); 2323 if (IS_ERR(vport)) 2324 goto exit_unlock_free; 2325 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2326 info->snd_portid, info->snd_seq, 0, 2327 OVS_VPORT_CMD_GET, GFP_ATOMIC); 2328 BUG_ON(err < 0); 2329 rcu_read_unlock(); 2330 2331 return genlmsg_reply(reply, info); 2332 2333 exit_unlock_free: 2334 rcu_read_unlock(); 2335 kfree_skb(reply); 2336 return err; 2337 } 2338 2339 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2340 { 2341 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2342 struct datapath *dp; 2343 int bucket = cb->args[0], skip = cb->args[1]; 2344 int i, j = 0; 2345 2346 rcu_read_lock(); 2347 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2348 if (!dp) { 2349 rcu_read_unlock(); 2350 return -ENODEV; 2351 } 2352 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2353 struct vport *vport; 2354 2355 j = 0; 2356 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2357 if (j >= skip && 2358 ovs_vport_cmd_fill_info(vport, skb, 2359 sock_net(skb->sk), 2360 NETLINK_CB(cb->skb).portid, 2361 cb->nlh->nlmsg_seq, 2362 NLM_F_MULTI, 2363 OVS_VPORT_CMD_GET, 2364 GFP_ATOMIC) < 0) 2365 goto out; 2366 2367 j++; 2368 } 2369 skip = 0; 2370 } 2371 out: 2372 rcu_read_unlock(); 2373 2374 cb->args[0] = i; 2375 cb->args[1] = j; 2376 2377 return skb->len; 2378 } 2379 2380 static void ovs_dp_masks_rebalance(struct work_struct *work) 2381 { 2382 struct ovs_net *ovs_net = container_of(work, struct ovs_net, 2383 masks_rebalance.work); 2384 struct datapath *dp; 2385 2386 ovs_lock(); 2387 2388 list_for_each_entry(dp, &ovs_net->dps, list_node) 2389 ovs_flow_masks_rebalance(&dp->table); 2390 2391 ovs_unlock(); 2392 2393 schedule_delayed_work(&ovs_net->masks_rebalance, 2394 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL)); 2395 } 2396 2397 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2398 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2399 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2400 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2401 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2402 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC }, 2403 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2404 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 }, 2405 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 }, 2406 }; 2407 2408 static const struct genl_small_ops dp_vport_genl_ops[] = { 2409 { .cmd = OVS_VPORT_CMD_NEW, 2410 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2411 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2412 .doit = ovs_vport_cmd_new 2413 }, 2414 { .cmd = OVS_VPORT_CMD_DEL, 2415 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2416 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2417 .doit = ovs_vport_cmd_del 2418 }, 2419 { .cmd = OVS_VPORT_CMD_GET, 2420 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2421 .flags = 0, /* OK for unprivileged users. */ 2422 .doit = ovs_vport_cmd_get, 2423 .dumpit = ovs_vport_cmd_dump 2424 }, 2425 { .cmd = OVS_VPORT_CMD_SET, 2426 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2427 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2428 .doit = ovs_vport_cmd_set, 2429 }, 2430 }; 2431 2432 struct genl_family dp_vport_genl_family __ro_after_init = { 2433 .hdrsize = sizeof(struct ovs_header), 2434 .name = OVS_VPORT_FAMILY, 2435 .version = OVS_VPORT_VERSION, 2436 .maxattr = OVS_VPORT_ATTR_MAX, 2437 .policy = vport_policy, 2438 .netnsok = true, 2439 .parallel_ops = true, 2440 .small_ops = dp_vport_genl_ops, 2441 .n_small_ops = ARRAY_SIZE(dp_vport_genl_ops), 2442 .mcgrps = &ovs_dp_vport_multicast_group, 2443 .n_mcgrps = 1, 2444 .module = THIS_MODULE, 2445 }; 2446 2447 static struct genl_family * const dp_genl_families[] = { 2448 &dp_datapath_genl_family, 2449 &dp_vport_genl_family, 2450 &dp_flow_genl_family, 2451 &dp_packet_genl_family, 2452 &dp_meter_genl_family, 2453 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 2454 &dp_ct_limit_genl_family, 2455 #endif 2456 }; 2457 2458 static void dp_unregister_genl(int n_families) 2459 { 2460 int i; 2461 2462 for (i = 0; i < n_families; i++) 2463 genl_unregister_family(dp_genl_families[i]); 2464 } 2465 2466 static int __init dp_register_genl(void) 2467 { 2468 int err; 2469 int i; 2470 2471 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2472 2473 err = genl_register_family(dp_genl_families[i]); 2474 if (err) 2475 goto error; 2476 } 2477 2478 return 0; 2479 2480 error: 2481 dp_unregister_genl(i); 2482 return err; 2483 } 2484 2485 static int __net_init ovs_init_net(struct net *net) 2486 { 2487 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2488 int err; 2489 2490 INIT_LIST_HEAD(&ovs_net->dps); 2491 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2492 INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance); 2493 2494 err = ovs_ct_init(net); 2495 if (err) 2496 return err; 2497 2498 schedule_delayed_work(&ovs_net->masks_rebalance, 2499 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL)); 2500 return 0; 2501 } 2502 2503 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2504 struct list_head *head) 2505 { 2506 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2507 struct datapath *dp; 2508 2509 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2510 int i; 2511 2512 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2513 struct vport *vport; 2514 2515 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2516 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2517 continue; 2518 2519 if (dev_net(vport->dev) == dnet) 2520 list_add(&vport->detach_list, head); 2521 } 2522 } 2523 } 2524 } 2525 2526 static void __net_exit ovs_exit_net(struct net *dnet) 2527 { 2528 struct datapath *dp, *dp_next; 2529 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2530 struct vport *vport, *vport_next; 2531 struct net *net; 2532 LIST_HEAD(head); 2533 2534 ovs_lock(); 2535 2536 ovs_ct_exit(dnet); 2537 2538 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2539 __dp_destroy(dp); 2540 2541 down_read(&net_rwsem); 2542 for_each_net(net) 2543 list_vports_from_net(net, dnet, &head); 2544 up_read(&net_rwsem); 2545 2546 /* Detach all vports from given namespace. */ 2547 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2548 list_del(&vport->detach_list); 2549 ovs_dp_detach_port(vport); 2550 } 2551 2552 ovs_unlock(); 2553 2554 cancel_delayed_work_sync(&ovs_net->masks_rebalance); 2555 cancel_work_sync(&ovs_net->dp_notify_work); 2556 } 2557 2558 static struct pernet_operations ovs_net_ops = { 2559 .init = ovs_init_net, 2560 .exit = ovs_exit_net, 2561 .id = &ovs_net_id, 2562 .size = sizeof(struct ovs_net), 2563 }; 2564 2565 static int __init dp_init(void) 2566 { 2567 int err; 2568 2569 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > 2570 sizeof_field(struct sk_buff, cb)); 2571 2572 pr_info("Open vSwitch switching datapath\n"); 2573 2574 err = action_fifos_init(); 2575 if (err) 2576 goto error; 2577 2578 err = ovs_internal_dev_rtnl_link_register(); 2579 if (err) 2580 goto error_action_fifos_exit; 2581 2582 err = ovs_flow_init(); 2583 if (err) 2584 goto error_unreg_rtnl_link; 2585 2586 err = ovs_vport_init(); 2587 if (err) 2588 goto error_flow_exit; 2589 2590 err = register_pernet_device(&ovs_net_ops); 2591 if (err) 2592 goto error_vport_exit; 2593 2594 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2595 if (err) 2596 goto error_netns_exit; 2597 2598 err = ovs_netdev_init(); 2599 if (err) 2600 goto error_unreg_notifier; 2601 2602 err = dp_register_genl(); 2603 if (err < 0) 2604 goto error_unreg_netdev; 2605 2606 return 0; 2607 2608 error_unreg_netdev: 2609 ovs_netdev_exit(); 2610 error_unreg_notifier: 2611 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2612 error_netns_exit: 2613 unregister_pernet_device(&ovs_net_ops); 2614 error_vport_exit: 2615 ovs_vport_exit(); 2616 error_flow_exit: 2617 ovs_flow_exit(); 2618 error_unreg_rtnl_link: 2619 ovs_internal_dev_rtnl_link_unregister(); 2620 error_action_fifos_exit: 2621 action_fifos_exit(); 2622 error: 2623 return err; 2624 } 2625 2626 static void dp_cleanup(void) 2627 { 2628 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2629 ovs_netdev_exit(); 2630 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2631 unregister_pernet_device(&ovs_net_ops); 2632 rcu_barrier(); 2633 ovs_vport_exit(); 2634 ovs_flow_exit(); 2635 ovs_internal_dev_rtnl_link_unregister(); 2636 action_fifos_exit(); 2637 } 2638 2639 module_init(dp_init); 2640 module_exit(dp_cleanup); 2641 2642 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2643 MODULE_LICENSE("GPL"); 2644 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY); 2645 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY); 2646 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY); 2647 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY); 2648 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY); 2649 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY); 2650