1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2007-2014 Nicira, Inc. 4 */ 5 6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7 8 #include <linux/init.h> 9 #include <linux/module.h> 10 #include <linux/if_arp.h> 11 #include <linux/if_vlan.h> 12 #include <linux/in.h> 13 #include <linux/ip.h> 14 #include <linux/jhash.h> 15 #include <linux/delay.h> 16 #include <linux/time.h> 17 #include <linux/etherdevice.h> 18 #include <linux/genetlink.h> 19 #include <linux/kernel.h> 20 #include <linux/kthread.h> 21 #include <linux/mutex.h> 22 #include <linux/percpu.h> 23 #include <linux/rcupdate.h> 24 #include <linux/tcp.h> 25 #include <linux/udp.h> 26 #include <linux/ethtool.h> 27 #include <linux/wait.h> 28 #include <asm/div64.h> 29 #include <linux/highmem.h> 30 #include <linux/netfilter_bridge.h> 31 #include <linux/netfilter_ipv4.h> 32 #include <linux/inetdevice.h> 33 #include <linux/list.h> 34 #include <linux/openvswitch.h> 35 #include <linux/rculist.h> 36 #include <linux/dmi.h> 37 #include <net/genetlink.h> 38 #include <net/net_namespace.h> 39 #include <net/netns/generic.h> 40 41 #include "datapath.h" 42 #include "flow.h" 43 #include "flow_table.h" 44 #include "flow_netlink.h" 45 #include "meter.h" 46 #include "vport-internal_dev.h" 47 #include "vport-netdev.h" 48 49 unsigned int ovs_net_id __read_mostly; 50 51 static struct genl_family dp_packet_genl_family; 52 static struct genl_family dp_flow_genl_family; 53 static struct genl_family dp_datapath_genl_family; 54 55 static const struct nla_policy flow_policy[]; 56 57 static const struct genl_multicast_group ovs_dp_flow_multicast_group = { 58 .name = OVS_FLOW_MCGROUP, 59 }; 60 61 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = { 62 .name = OVS_DATAPATH_MCGROUP, 63 }; 64 65 static const struct genl_multicast_group ovs_dp_vport_multicast_group = { 66 .name = OVS_VPORT_MCGROUP, 67 }; 68 69 /* Check if need to build a reply message. 70 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */ 71 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info, 72 unsigned int group) 73 { 74 return info->nlhdr->nlmsg_flags & NLM_F_ECHO || 75 genl_has_listeners(family, genl_info_net(info), group); 76 } 77 78 static void ovs_notify(struct genl_family *family, 79 struct sk_buff *skb, struct genl_info *info) 80 { 81 genl_notify(family, skb, info, 0, GFP_KERNEL); 82 } 83 84 /** 85 * DOC: Locking: 86 * 87 * All writes e.g. Writes to device state (add/remove datapath, port, set 88 * operations on vports, etc.), Writes to other state (flow table 89 * modifications, set miscellaneous datapath parameters, etc.) are protected 90 * by ovs_lock. 91 * 92 * Reads are protected by RCU. 93 * 94 * There are a few special cases (mostly stats) that have their own 95 * synchronization but they nest under all of above and don't interact with 96 * each other. 97 * 98 * The RTNL lock nests inside ovs_mutex. 99 */ 100 101 static DEFINE_MUTEX(ovs_mutex); 102 103 void ovs_lock(void) 104 { 105 mutex_lock(&ovs_mutex); 106 } 107 108 void ovs_unlock(void) 109 { 110 mutex_unlock(&ovs_mutex); 111 } 112 113 #ifdef CONFIG_LOCKDEP 114 int lockdep_ovsl_is_held(void) 115 { 116 if (debug_locks) 117 return lockdep_is_held(&ovs_mutex); 118 else 119 return 1; 120 } 121 #endif 122 123 static struct vport *new_vport(const struct vport_parms *); 124 static int queue_gso_packets(struct datapath *dp, struct sk_buff *, 125 const struct sw_flow_key *, 126 const struct dp_upcall_info *, 127 uint32_t cutlen); 128 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *, 129 const struct sw_flow_key *, 130 const struct dp_upcall_info *, 131 uint32_t cutlen); 132 133 /* Must be called with rcu_read_lock or ovs_mutex. */ 134 const char *ovs_dp_name(const struct datapath *dp) 135 { 136 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); 137 return ovs_vport_name(vport); 138 } 139 140 static int get_dpifindex(const struct datapath *dp) 141 { 142 struct vport *local; 143 int ifindex; 144 145 rcu_read_lock(); 146 147 local = ovs_vport_rcu(dp, OVSP_LOCAL); 148 if (local) 149 ifindex = local->dev->ifindex; 150 else 151 ifindex = 0; 152 153 rcu_read_unlock(); 154 155 return ifindex; 156 } 157 158 static void destroy_dp_rcu(struct rcu_head *rcu) 159 { 160 struct datapath *dp = container_of(rcu, struct datapath, rcu); 161 162 ovs_flow_tbl_destroy(&dp->table); 163 free_percpu(dp->stats_percpu); 164 kfree(dp->ports); 165 ovs_meters_exit(dp); 166 kfree(dp); 167 } 168 169 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 170 u16 port_no) 171 { 172 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 173 } 174 175 /* Called with ovs_mutex or RCU read lock. */ 176 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 177 { 178 struct vport *vport; 179 struct hlist_head *head; 180 181 head = vport_hash_bucket(dp, port_no); 182 hlist_for_each_entry_rcu(vport, head, dp_hash_node) { 183 if (vport->port_no == port_no) 184 return vport; 185 } 186 return NULL; 187 } 188 189 /* Called with ovs_mutex. */ 190 static struct vport *new_vport(const struct vport_parms *parms) 191 { 192 struct vport *vport; 193 194 vport = ovs_vport_add(parms); 195 if (!IS_ERR(vport)) { 196 struct datapath *dp = parms->dp; 197 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 198 199 hlist_add_head_rcu(&vport->dp_hash_node, head); 200 } 201 return vport; 202 } 203 204 void ovs_dp_detach_port(struct vport *p) 205 { 206 ASSERT_OVSL(); 207 208 /* First drop references to device. */ 209 hlist_del_rcu(&p->dp_hash_node); 210 211 /* Then destroy it. */ 212 ovs_vport_del(p); 213 } 214 215 /* Must be called with rcu_read_lock. */ 216 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key) 217 { 218 const struct vport *p = OVS_CB(skb)->input_vport; 219 struct datapath *dp = p->dp; 220 struct sw_flow *flow; 221 struct sw_flow_actions *sf_acts; 222 struct dp_stats_percpu *stats; 223 u64 *stats_counter; 224 u32 n_mask_hit; 225 226 stats = this_cpu_ptr(dp->stats_percpu); 227 228 /* Look up flow. */ 229 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit); 230 if (unlikely(!flow)) { 231 struct dp_upcall_info upcall; 232 int error; 233 234 memset(&upcall, 0, sizeof(upcall)); 235 upcall.cmd = OVS_PACKET_CMD_MISS; 236 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 237 upcall.mru = OVS_CB(skb)->mru; 238 error = ovs_dp_upcall(dp, skb, key, &upcall, 0); 239 if (unlikely(error)) 240 kfree_skb(skb); 241 else 242 consume_skb(skb); 243 stats_counter = &stats->n_missed; 244 goto out; 245 } 246 247 ovs_flow_stats_update(flow, key->tp.flags, skb); 248 sf_acts = rcu_dereference(flow->sf_acts); 249 ovs_execute_actions(dp, skb, sf_acts, key); 250 251 stats_counter = &stats->n_hit; 252 253 out: 254 /* Update datapath statistics. */ 255 u64_stats_update_begin(&stats->syncp); 256 (*stats_counter)++; 257 stats->n_mask_hit += n_mask_hit; 258 u64_stats_update_end(&stats->syncp); 259 } 260 261 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 262 const struct sw_flow_key *key, 263 const struct dp_upcall_info *upcall_info, 264 uint32_t cutlen) 265 { 266 struct dp_stats_percpu *stats; 267 int err; 268 269 if (upcall_info->portid == 0) { 270 err = -ENOTCONN; 271 goto err; 272 } 273 274 if (!skb_is_gso(skb)) 275 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 276 else 277 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen); 278 if (err) 279 goto err; 280 281 return 0; 282 283 err: 284 stats = this_cpu_ptr(dp->stats_percpu); 285 286 u64_stats_update_begin(&stats->syncp); 287 stats->n_lost++; 288 u64_stats_update_end(&stats->syncp); 289 290 return err; 291 } 292 293 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 294 const struct sw_flow_key *key, 295 const struct dp_upcall_info *upcall_info, 296 uint32_t cutlen) 297 { 298 unsigned int gso_type = skb_shinfo(skb)->gso_type; 299 struct sw_flow_key later_key; 300 struct sk_buff *segs, *nskb; 301 int err; 302 303 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET); 304 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 305 if (IS_ERR(segs)) 306 return PTR_ERR(segs); 307 if (segs == NULL) 308 return -EINVAL; 309 310 if (gso_type & SKB_GSO_UDP) { 311 /* The initial flow key extracted by ovs_flow_key_extract() 312 * in this case is for a first fragment, so we need to 313 * properly mark later fragments. 314 */ 315 later_key = *key; 316 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 317 } 318 319 /* Queue all of the segments. */ 320 skb = segs; 321 do { 322 if (gso_type & SKB_GSO_UDP && skb != segs) 323 key = &later_key; 324 325 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 326 if (err) 327 break; 328 329 } while ((skb = skb->next)); 330 331 /* Free all of the segments. */ 332 skb = segs; 333 do { 334 nskb = skb->next; 335 if (err) 336 kfree_skb(skb); 337 else 338 consume_skb(skb); 339 } while ((skb = nskb)); 340 return err; 341 } 342 343 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, 344 unsigned int hdrlen, int actions_attrlen) 345 { 346 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 347 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 348 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */ 349 + nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */ 350 351 /* OVS_PACKET_ATTR_USERDATA */ 352 if (upcall_info->userdata) 353 size += NLA_ALIGN(upcall_info->userdata->nla_len); 354 355 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ 356 if (upcall_info->egress_tun_info) 357 size += nla_total_size(ovs_tun_key_attr_size()); 358 359 /* OVS_PACKET_ATTR_ACTIONS */ 360 if (upcall_info->actions_len) 361 size += nla_total_size(actions_attrlen); 362 363 /* OVS_PACKET_ATTR_MRU */ 364 if (upcall_info->mru) 365 size += nla_total_size(sizeof(upcall_info->mru)); 366 367 return size; 368 } 369 370 static void pad_packet(struct datapath *dp, struct sk_buff *skb) 371 { 372 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 373 size_t plen = NLA_ALIGN(skb->len) - skb->len; 374 375 if (plen > 0) 376 skb_put_zero(skb, plen); 377 } 378 } 379 380 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 381 const struct sw_flow_key *key, 382 const struct dp_upcall_info *upcall_info, 383 uint32_t cutlen) 384 { 385 struct ovs_header *upcall; 386 struct sk_buff *nskb = NULL; 387 struct sk_buff *user_skb = NULL; /* to be queued to userspace */ 388 struct nlattr *nla; 389 size_t len; 390 unsigned int hlen; 391 int err, dp_ifindex; 392 393 dp_ifindex = get_dpifindex(dp); 394 if (!dp_ifindex) 395 return -ENODEV; 396 397 if (skb_vlan_tag_present(skb)) { 398 nskb = skb_clone(skb, GFP_ATOMIC); 399 if (!nskb) 400 return -ENOMEM; 401 402 nskb = __vlan_hwaccel_push_inside(nskb); 403 if (!nskb) 404 return -ENOMEM; 405 406 skb = nskb; 407 } 408 409 if (nla_attr_size(skb->len) > USHRT_MAX) { 410 err = -EFBIG; 411 goto out; 412 } 413 414 /* Complete checksum if needed */ 415 if (skb->ip_summed == CHECKSUM_PARTIAL && 416 (err = skb_csum_hwoffload_help(skb, 0))) 417 goto out; 418 419 /* Older versions of OVS user space enforce alignment of the last 420 * Netlink attribute to NLA_ALIGNTO which would require extensive 421 * padding logic. Only perform zerocopy if padding is not required. 422 */ 423 if (dp->user_features & OVS_DP_F_UNALIGNED) 424 hlen = skb_zerocopy_headlen(skb); 425 else 426 hlen = skb->len; 427 428 len = upcall_msg_size(upcall_info, hlen - cutlen, 429 OVS_CB(skb)->acts_origlen); 430 user_skb = genlmsg_new(len, GFP_ATOMIC); 431 if (!user_skb) { 432 err = -ENOMEM; 433 goto out; 434 } 435 436 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 437 0, upcall_info->cmd); 438 if (!upcall) { 439 err = -EINVAL; 440 goto out; 441 } 442 upcall->dp_ifindex = dp_ifindex; 443 444 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); 445 if (err) 446 goto out; 447 448 if (upcall_info->userdata) 449 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 450 nla_len(upcall_info->userdata), 451 nla_data(upcall_info->userdata)); 452 453 if (upcall_info->egress_tun_info) { 454 nla = nla_nest_start_noflag(user_skb, 455 OVS_PACKET_ATTR_EGRESS_TUN_KEY); 456 if (!nla) { 457 err = -EMSGSIZE; 458 goto out; 459 } 460 err = ovs_nla_put_tunnel_info(user_skb, 461 upcall_info->egress_tun_info); 462 if (err) 463 goto out; 464 465 nla_nest_end(user_skb, nla); 466 } 467 468 if (upcall_info->actions_len) { 469 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS); 470 if (!nla) { 471 err = -EMSGSIZE; 472 goto out; 473 } 474 err = ovs_nla_put_actions(upcall_info->actions, 475 upcall_info->actions_len, 476 user_skb); 477 if (!err) 478 nla_nest_end(user_skb, nla); 479 else 480 nla_nest_cancel(user_skb, nla); 481 } 482 483 /* Add OVS_PACKET_ATTR_MRU */ 484 if (upcall_info->mru) { 485 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, 486 upcall_info->mru)) { 487 err = -ENOBUFS; 488 goto out; 489 } 490 pad_packet(dp, user_skb); 491 } 492 493 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */ 494 if (cutlen > 0) { 495 if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, 496 skb->len)) { 497 err = -ENOBUFS; 498 goto out; 499 } 500 pad_packet(dp, user_skb); 501 } 502 503 /* Only reserve room for attribute header, packet data is added 504 * in skb_zerocopy() */ 505 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 506 err = -ENOBUFS; 507 goto out; 508 } 509 nla->nla_len = nla_attr_size(skb->len - cutlen); 510 511 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen); 512 if (err) 513 goto out; 514 515 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 516 pad_packet(dp, user_skb); 517 518 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 519 520 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 521 user_skb = NULL; 522 out: 523 if (err) 524 skb_tx_error(skb); 525 kfree_skb(user_skb); 526 kfree_skb(nskb); 527 return err; 528 } 529 530 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 531 { 532 struct ovs_header *ovs_header = info->userhdr; 533 struct net *net = sock_net(skb->sk); 534 struct nlattr **a = info->attrs; 535 struct sw_flow_actions *acts; 536 struct sk_buff *packet; 537 struct sw_flow *flow; 538 struct sw_flow_actions *sf_acts; 539 struct datapath *dp; 540 struct vport *input_vport; 541 u16 mru = 0; 542 int len; 543 int err; 544 bool log = !a[OVS_PACKET_ATTR_PROBE]; 545 546 err = -EINVAL; 547 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 548 !a[OVS_PACKET_ATTR_ACTIONS]) 549 goto err; 550 551 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 552 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 553 err = -ENOMEM; 554 if (!packet) 555 goto err; 556 skb_reserve(packet, NET_IP_ALIGN); 557 558 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 559 560 /* Set packet's mru */ 561 if (a[OVS_PACKET_ATTR_MRU]) { 562 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]); 563 packet->ignore_df = 1; 564 } 565 OVS_CB(packet)->mru = mru; 566 567 /* Build an sw_flow for sending this packet. */ 568 flow = ovs_flow_alloc(); 569 err = PTR_ERR(flow); 570 if (IS_ERR(flow)) 571 goto err_kfree_skb; 572 573 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY], 574 packet, &flow->key, log); 575 if (err) 576 goto err_flow_free; 577 578 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS], 579 &flow->key, &acts, log); 580 if (err) 581 goto err_flow_free; 582 583 rcu_assign_pointer(flow->sf_acts, acts); 584 packet->priority = flow->key.phy.priority; 585 packet->mark = flow->key.phy.skb_mark; 586 587 rcu_read_lock(); 588 dp = get_dp_rcu(net, ovs_header->dp_ifindex); 589 err = -ENODEV; 590 if (!dp) 591 goto err_unlock; 592 593 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 594 if (!input_vport) 595 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 596 597 if (!input_vport) 598 goto err_unlock; 599 600 packet->dev = input_vport->dev; 601 OVS_CB(packet)->input_vport = input_vport; 602 sf_acts = rcu_dereference(flow->sf_acts); 603 604 local_bh_disable(); 605 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); 606 local_bh_enable(); 607 rcu_read_unlock(); 608 609 ovs_flow_free(flow, false); 610 return err; 611 612 err_unlock: 613 rcu_read_unlock(); 614 err_flow_free: 615 ovs_flow_free(flow, false); 616 err_kfree_skb: 617 kfree_skb(packet); 618 err: 619 return err; 620 } 621 622 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 623 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 624 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 625 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 626 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, 627 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, 628 }; 629 630 static const struct genl_ops dp_packet_genl_ops[] = { 631 { .cmd = OVS_PACKET_CMD_EXECUTE, 632 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 633 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 634 .doit = ovs_packet_cmd_execute 635 } 636 }; 637 638 static struct genl_family dp_packet_genl_family __ro_after_init = { 639 .hdrsize = sizeof(struct ovs_header), 640 .name = OVS_PACKET_FAMILY, 641 .version = OVS_PACKET_VERSION, 642 .maxattr = OVS_PACKET_ATTR_MAX, 643 .policy = packet_policy, 644 .netnsok = true, 645 .parallel_ops = true, 646 .ops = dp_packet_genl_ops, 647 .n_ops = ARRAY_SIZE(dp_packet_genl_ops), 648 .module = THIS_MODULE, 649 }; 650 651 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 652 struct ovs_dp_megaflow_stats *mega_stats) 653 { 654 int i; 655 656 memset(mega_stats, 0, sizeof(*mega_stats)); 657 658 stats->n_flows = ovs_flow_tbl_count(&dp->table); 659 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 660 661 stats->n_hit = stats->n_missed = stats->n_lost = 0; 662 663 for_each_possible_cpu(i) { 664 const struct dp_stats_percpu *percpu_stats; 665 struct dp_stats_percpu local_stats; 666 unsigned int start; 667 668 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 669 670 do { 671 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 672 local_stats = *percpu_stats; 673 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 674 675 stats->n_hit += local_stats.n_hit; 676 stats->n_missed += local_stats.n_missed; 677 stats->n_lost += local_stats.n_lost; 678 mega_stats->n_mask_hit += local_stats.n_mask_hit; 679 } 680 } 681 682 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) 683 { 684 return ovs_identifier_is_ufid(sfid) && 685 !(ufid_flags & OVS_UFID_F_OMIT_KEY); 686 } 687 688 static bool should_fill_mask(uint32_t ufid_flags) 689 { 690 return !(ufid_flags & OVS_UFID_F_OMIT_MASK); 691 } 692 693 static bool should_fill_actions(uint32_t ufid_flags) 694 { 695 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); 696 } 697 698 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, 699 const struct sw_flow_id *sfid, 700 uint32_t ufid_flags) 701 { 702 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); 703 704 /* OVS_FLOW_ATTR_UFID */ 705 if (sfid && ovs_identifier_is_ufid(sfid)) 706 len += nla_total_size(sfid->ufid_len); 707 708 /* OVS_FLOW_ATTR_KEY */ 709 if (!sfid || should_fill_key(sfid, ufid_flags)) 710 len += nla_total_size(ovs_key_attr_size()); 711 712 /* OVS_FLOW_ATTR_MASK */ 713 if (should_fill_mask(ufid_flags)) 714 len += nla_total_size(ovs_key_attr_size()); 715 716 /* OVS_FLOW_ATTR_ACTIONS */ 717 if (should_fill_actions(ufid_flags)) 718 len += nla_total_size(acts->orig_len); 719 720 return len 721 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 722 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 723 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */ 724 } 725 726 /* Called with ovs_mutex or RCU read lock. */ 727 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 728 struct sk_buff *skb) 729 { 730 struct ovs_flow_stats stats; 731 __be16 tcp_flags; 732 unsigned long used; 733 734 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 735 736 if (used && 737 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used), 738 OVS_FLOW_ATTR_PAD)) 739 return -EMSGSIZE; 740 741 if (stats.n_packets && 742 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS, 743 sizeof(struct ovs_flow_stats), &stats, 744 OVS_FLOW_ATTR_PAD)) 745 return -EMSGSIZE; 746 747 if ((u8)ntohs(tcp_flags) && 748 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 749 return -EMSGSIZE; 750 751 return 0; 752 } 753 754 /* Called with ovs_mutex or RCU read lock. */ 755 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 756 struct sk_buff *skb, int skb_orig_len) 757 { 758 struct nlattr *start; 759 int err; 760 761 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 762 * this is the first flow to be dumped into 'skb'. This is unusual for 763 * Netlink but individual action lists can be longer than 764 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 765 * The userspace caller can always fetch the actions separately if it 766 * really wants them. (Most userspace callers in fact don't care.) 767 * 768 * This can only fail for dump operations because the skb is always 769 * properly sized for single flows. 770 */ 771 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS); 772 if (start) { 773 const struct sw_flow_actions *sf_acts; 774 775 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 776 err = ovs_nla_put_actions(sf_acts->actions, 777 sf_acts->actions_len, skb); 778 779 if (!err) 780 nla_nest_end(skb, start); 781 else { 782 if (skb_orig_len) 783 return err; 784 785 nla_nest_cancel(skb, start); 786 } 787 } else if (skb_orig_len) { 788 return -EMSGSIZE; 789 } 790 791 return 0; 792 } 793 794 /* Called with ovs_mutex or RCU read lock. */ 795 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 796 struct sk_buff *skb, u32 portid, 797 u32 seq, u32 flags, u8 cmd, u32 ufid_flags) 798 { 799 const int skb_orig_len = skb->len; 800 struct ovs_header *ovs_header; 801 int err; 802 803 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 804 flags, cmd); 805 if (!ovs_header) 806 return -EMSGSIZE; 807 808 ovs_header->dp_ifindex = dp_ifindex; 809 810 err = ovs_nla_put_identifier(flow, skb); 811 if (err) 812 goto error; 813 814 if (should_fill_key(&flow->id, ufid_flags)) { 815 err = ovs_nla_put_masked_key(flow, skb); 816 if (err) 817 goto error; 818 } 819 820 if (should_fill_mask(ufid_flags)) { 821 err = ovs_nla_put_mask(flow, skb); 822 if (err) 823 goto error; 824 } 825 826 err = ovs_flow_cmd_fill_stats(flow, skb); 827 if (err) 828 goto error; 829 830 if (should_fill_actions(ufid_flags)) { 831 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 832 if (err) 833 goto error; 834 } 835 836 genlmsg_end(skb, ovs_header); 837 return 0; 838 839 error: 840 genlmsg_cancel(skb, ovs_header); 841 return err; 842 } 843 844 /* May not be called with RCU read lock. */ 845 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 846 const struct sw_flow_id *sfid, 847 struct genl_info *info, 848 bool always, 849 uint32_t ufid_flags) 850 { 851 struct sk_buff *skb; 852 size_t len; 853 854 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 855 return NULL; 856 857 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); 858 skb = genlmsg_new(len, GFP_KERNEL); 859 if (!skb) 860 return ERR_PTR(-ENOMEM); 861 862 return skb; 863 } 864 865 /* Called with ovs_mutex. */ 866 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 867 int dp_ifindex, 868 struct genl_info *info, u8 cmd, 869 bool always, u32 ufid_flags) 870 { 871 struct sk_buff *skb; 872 int retval; 873 874 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), 875 &flow->id, info, always, ufid_flags); 876 if (IS_ERR_OR_NULL(skb)) 877 return skb; 878 879 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 880 info->snd_portid, info->snd_seq, 0, 881 cmd, ufid_flags); 882 BUG_ON(retval < 0); 883 return skb; 884 } 885 886 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 887 { 888 struct net *net = sock_net(skb->sk); 889 struct nlattr **a = info->attrs; 890 struct ovs_header *ovs_header = info->userhdr; 891 struct sw_flow *flow = NULL, *new_flow; 892 struct sw_flow_mask mask; 893 struct sk_buff *reply; 894 struct datapath *dp; 895 struct sw_flow_actions *acts; 896 struct sw_flow_match match; 897 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 898 int error; 899 bool log = !a[OVS_FLOW_ATTR_PROBE]; 900 901 /* Must have key and actions. */ 902 error = -EINVAL; 903 if (!a[OVS_FLOW_ATTR_KEY]) { 904 OVS_NLERR(log, "Flow key attr not present in new flow."); 905 goto error; 906 } 907 if (!a[OVS_FLOW_ATTR_ACTIONS]) { 908 OVS_NLERR(log, "Flow actions attr not present in new flow."); 909 goto error; 910 } 911 912 /* Most of the time we need to allocate a new flow, do it before 913 * locking. 914 */ 915 new_flow = ovs_flow_alloc(); 916 if (IS_ERR(new_flow)) { 917 error = PTR_ERR(new_flow); 918 goto error; 919 } 920 921 /* Extract key. */ 922 ovs_match_init(&match, &new_flow->key, false, &mask); 923 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 924 a[OVS_FLOW_ATTR_MASK], log); 925 if (error) 926 goto err_kfree_flow; 927 928 /* Extract flow identifier. */ 929 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID], 930 &new_flow->key, log); 931 if (error) 932 goto err_kfree_flow; 933 934 /* unmasked key is needed to match when ufid is not used. */ 935 if (ovs_identifier_is_key(&new_flow->id)) 936 match.key = new_flow->id.unmasked_key; 937 938 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask); 939 940 /* Validate actions. */ 941 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS], 942 &new_flow->key, &acts, log); 943 if (error) { 944 OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); 945 goto err_kfree_flow; 946 } 947 948 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false, 949 ufid_flags); 950 if (IS_ERR(reply)) { 951 error = PTR_ERR(reply); 952 goto err_kfree_acts; 953 } 954 955 ovs_lock(); 956 dp = get_dp(net, ovs_header->dp_ifindex); 957 if (unlikely(!dp)) { 958 error = -ENODEV; 959 goto err_unlock_ovs; 960 } 961 962 /* Check if this is a duplicate flow */ 963 if (ovs_identifier_is_ufid(&new_flow->id)) 964 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id); 965 if (!flow) 966 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key); 967 if (likely(!flow)) { 968 rcu_assign_pointer(new_flow->sf_acts, acts); 969 970 /* Put flow in bucket. */ 971 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 972 if (unlikely(error)) { 973 acts = NULL; 974 goto err_unlock_ovs; 975 } 976 977 if (unlikely(reply)) { 978 error = ovs_flow_cmd_fill_info(new_flow, 979 ovs_header->dp_ifindex, 980 reply, info->snd_portid, 981 info->snd_seq, 0, 982 OVS_FLOW_CMD_NEW, 983 ufid_flags); 984 BUG_ON(error < 0); 985 } 986 ovs_unlock(); 987 } else { 988 struct sw_flow_actions *old_acts; 989 990 /* Bail out if we're not allowed to modify an existing flow. 991 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 992 * because Generic Netlink treats the latter as a dump 993 * request. We also accept NLM_F_EXCL in case that bug ever 994 * gets fixed. 995 */ 996 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 997 | NLM_F_EXCL))) { 998 error = -EEXIST; 999 goto err_unlock_ovs; 1000 } 1001 /* The flow identifier has to be the same for flow updates. 1002 * Look for any overlapping flow. 1003 */ 1004 if (unlikely(!ovs_flow_cmp(flow, &match))) { 1005 if (ovs_identifier_is_key(&flow->id)) 1006 flow = ovs_flow_tbl_lookup_exact(&dp->table, 1007 &match); 1008 else /* UFID matches but key is different */ 1009 flow = NULL; 1010 if (!flow) { 1011 error = -ENOENT; 1012 goto err_unlock_ovs; 1013 } 1014 } 1015 /* Update actions. */ 1016 old_acts = ovsl_dereference(flow->sf_acts); 1017 rcu_assign_pointer(flow->sf_acts, acts); 1018 1019 if (unlikely(reply)) { 1020 error = ovs_flow_cmd_fill_info(flow, 1021 ovs_header->dp_ifindex, 1022 reply, info->snd_portid, 1023 info->snd_seq, 0, 1024 OVS_FLOW_CMD_NEW, 1025 ufid_flags); 1026 BUG_ON(error < 0); 1027 } 1028 ovs_unlock(); 1029 1030 ovs_nla_free_flow_actions_rcu(old_acts); 1031 ovs_flow_free(new_flow, false); 1032 } 1033 1034 if (reply) 1035 ovs_notify(&dp_flow_genl_family, reply, info); 1036 return 0; 1037 1038 err_unlock_ovs: 1039 ovs_unlock(); 1040 kfree_skb(reply); 1041 err_kfree_acts: 1042 ovs_nla_free_flow_actions(acts); 1043 err_kfree_flow: 1044 ovs_flow_free(new_flow, false); 1045 error: 1046 return error; 1047 } 1048 1049 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ 1050 static struct sw_flow_actions *get_flow_actions(struct net *net, 1051 const struct nlattr *a, 1052 const struct sw_flow_key *key, 1053 const struct sw_flow_mask *mask, 1054 bool log) 1055 { 1056 struct sw_flow_actions *acts; 1057 struct sw_flow_key masked_key; 1058 int error; 1059 1060 ovs_flow_mask_key(&masked_key, key, true, mask); 1061 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log); 1062 if (error) { 1063 OVS_NLERR(log, 1064 "Actions may not be safe on all matching packets"); 1065 return ERR_PTR(error); 1066 } 1067 1068 return acts; 1069 } 1070 1071 /* Factor out match-init and action-copy to avoid 1072 * "Wframe-larger-than=1024" warning. Because mask is only 1073 * used to get actions, we new a function to save some 1074 * stack space. 1075 * 1076 * If there are not key and action attrs, we return 0 1077 * directly. In the case, the caller will also not use the 1078 * match as before. If there is action attr, we try to get 1079 * actions and save them to *acts. Before returning from 1080 * the function, we reset the match->mask pointer. Because 1081 * we should not to return match object with dangling reference 1082 * to mask. 1083 * */ 1084 static int ovs_nla_init_match_and_action(struct net *net, 1085 struct sw_flow_match *match, 1086 struct sw_flow_key *key, 1087 struct nlattr **a, 1088 struct sw_flow_actions **acts, 1089 bool log) 1090 { 1091 struct sw_flow_mask mask; 1092 int error = 0; 1093 1094 if (a[OVS_FLOW_ATTR_KEY]) { 1095 ovs_match_init(match, key, true, &mask); 1096 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY], 1097 a[OVS_FLOW_ATTR_MASK], log); 1098 if (error) 1099 goto error; 1100 } 1101 1102 if (a[OVS_FLOW_ATTR_ACTIONS]) { 1103 if (!a[OVS_FLOW_ATTR_KEY]) { 1104 OVS_NLERR(log, 1105 "Flow key attribute not present in set flow."); 1106 error = -EINVAL; 1107 goto error; 1108 } 1109 1110 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key, 1111 &mask, log); 1112 if (IS_ERR(*acts)) { 1113 error = PTR_ERR(*acts); 1114 goto error; 1115 } 1116 } 1117 1118 /* On success, error is 0. */ 1119 error: 1120 match->mask = NULL; 1121 return error; 1122 } 1123 1124 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 1125 { 1126 struct net *net = sock_net(skb->sk); 1127 struct nlattr **a = info->attrs; 1128 struct ovs_header *ovs_header = info->userhdr; 1129 struct sw_flow_key key; 1130 struct sw_flow *flow; 1131 struct sk_buff *reply = NULL; 1132 struct datapath *dp; 1133 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 1134 struct sw_flow_match match; 1135 struct sw_flow_id sfid; 1136 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1137 int error = 0; 1138 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1139 bool ufid_present; 1140 1141 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); 1142 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) { 1143 OVS_NLERR(log, 1144 "Flow set message rejected, Key attribute missing."); 1145 return -EINVAL; 1146 } 1147 1148 error = ovs_nla_init_match_and_action(net, &match, &key, a, 1149 &acts, log); 1150 if (error) 1151 goto error; 1152 1153 if (acts) { 1154 /* Can allocate before locking if have acts. */ 1155 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false, 1156 ufid_flags); 1157 if (IS_ERR(reply)) { 1158 error = PTR_ERR(reply); 1159 goto err_kfree_acts; 1160 } 1161 } 1162 1163 ovs_lock(); 1164 dp = get_dp(net, ovs_header->dp_ifindex); 1165 if (unlikely(!dp)) { 1166 error = -ENODEV; 1167 goto err_unlock_ovs; 1168 } 1169 /* Check that the flow exists. */ 1170 if (ufid_present) 1171 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid); 1172 else 1173 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1174 if (unlikely(!flow)) { 1175 error = -ENOENT; 1176 goto err_unlock_ovs; 1177 } 1178 1179 /* Update actions, if present. */ 1180 if (likely(acts)) { 1181 old_acts = ovsl_dereference(flow->sf_acts); 1182 rcu_assign_pointer(flow->sf_acts, acts); 1183 1184 if (unlikely(reply)) { 1185 error = ovs_flow_cmd_fill_info(flow, 1186 ovs_header->dp_ifindex, 1187 reply, info->snd_portid, 1188 info->snd_seq, 0, 1189 OVS_FLOW_CMD_SET, 1190 ufid_flags); 1191 BUG_ON(error < 0); 1192 } 1193 } else { 1194 /* Could not alloc without acts before locking. */ 1195 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1196 info, OVS_FLOW_CMD_SET, false, 1197 ufid_flags); 1198 1199 if (IS_ERR(reply)) { 1200 error = PTR_ERR(reply); 1201 goto err_unlock_ovs; 1202 } 1203 } 1204 1205 /* Clear stats. */ 1206 if (a[OVS_FLOW_ATTR_CLEAR]) 1207 ovs_flow_stats_clear(flow); 1208 ovs_unlock(); 1209 1210 if (reply) 1211 ovs_notify(&dp_flow_genl_family, reply, info); 1212 if (old_acts) 1213 ovs_nla_free_flow_actions_rcu(old_acts); 1214 1215 return 0; 1216 1217 err_unlock_ovs: 1218 ovs_unlock(); 1219 kfree_skb(reply); 1220 err_kfree_acts: 1221 ovs_nla_free_flow_actions(acts); 1222 error: 1223 return error; 1224 } 1225 1226 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1227 { 1228 struct nlattr **a = info->attrs; 1229 struct ovs_header *ovs_header = info->userhdr; 1230 struct net *net = sock_net(skb->sk); 1231 struct sw_flow_key key; 1232 struct sk_buff *reply; 1233 struct sw_flow *flow; 1234 struct datapath *dp; 1235 struct sw_flow_match match; 1236 struct sw_flow_id ufid; 1237 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1238 int err = 0; 1239 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1240 bool ufid_present; 1241 1242 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1243 if (a[OVS_FLOW_ATTR_KEY]) { 1244 ovs_match_init(&match, &key, true, NULL); 1245 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL, 1246 log); 1247 } else if (!ufid_present) { 1248 OVS_NLERR(log, 1249 "Flow get message rejected, Key attribute missing."); 1250 err = -EINVAL; 1251 } 1252 if (err) 1253 return err; 1254 1255 ovs_lock(); 1256 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1257 if (!dp) { 1258 err = -ENODEV; 1259 goto unlock; 1260 } 1261 1262 if (ufid_present) 1263 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1264 else 1265 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1266 if (!flow) { 1267 err = -ENOENT; 1268 goto unlock; 1269 } 1270 1271 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1272 OVS_FLOW_CMD_GET, true, ufid_flags); 1273 if (IS_ERR(reply)) { 1274 err = PTR_ERR(reply); 1275 goto unlock; 1276 } 1277 1278 ovs_unlock(); 1279 return genlmsg_reply(reply, info); 1280 unlock: 1281 ovs_unlock(); 1282 return err; 1283 } 1284 1285 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1286 { 1287 struct nlattr **a = info->attrs; 1288 struct ovs_header *ovs_header = info->userhdr; 1289 struct net *net = sock_net(skb->sk); 1290 struct sw_flow_key key; 1291 struct sk_buff *reply; 1292 struct sw_flow *flow = NULL; 1293 struct datapath *dp; 1294 struct sw_flow_match match; 1295 struct sw_flow_id ufid; 1296 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1297 int err; 1298 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1299 bool ufid_present; 1300 1301 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1302 if (a[OVS_FLOW_ATTR_KEY]) { 1303 ovs_match_init(&match, &key, true, NULL); 1304 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1305 NULL, log); 1306 if (unlikely(err)) 1307 return err; 1308 } 1309 1310 ovs_lock(); 1311 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1312 if (unlikely(!dp)) { 1313 err = -ENODEV; 1314 goto unlock; 1315 } 1316 1317 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) { 1318 err = ovs_flow_tbl_flush(&dp->table); 1319 goto unlock; 1320 } 1321 1322 if (ufid_present) 1323 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1324 else 1325 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1326 if (unlikely(!flow)) { 1327 err = -ENOENT; 1328 goto unlock; 1329 } 1330 1331 ovs_flow_tbl_remove(&dp->table, flow); 1332 ovs_unlock(); 1333 1334 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1335 &flow->id, info, false, ufid_flags); 1336 if (likely(reply)) { 1337 if (!IS_ERR(reply)) { 1338 rcu_read_lock(); /*To keep RCU checker happy. */ 1339 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1340 reply, info->snd_portid, 1341 info->snd_seq, 0, 1342 OVS_FLOW_CMD_DEL, 1343 ufid_flags); 1344 rcu_read_unlock(); 1345 BUG_ON(err < 0); 1346 1347 ovs_notify(&dp_flow_genl_family, reply, info); 1348 } else { 1349 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply)); 1350 } 1351 } 1352 1353 ovs_flow_free(flow, true); 1354 return 0; 1355 unlock: 1356 ovs_unlock(); 1357 return err; 1358 } 1359 1360 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1361 { 1362 struct nlattr *a[__OVS_FLOW_ATTR_MAX]; 1363 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1364 struct table_instance *ti; 1365 struct datapath *dp; 1366 u32 ufid_flags; 1367 int err; 1368 1369 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a, 1370 OVS_FLOW_ATTR_MAX, flow_policy, NULL); 1371 if (err) 1372 return err; 1373 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1374 1375 rcu_read_lock(); 1376 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1377 if (!dp) { 1378 rcu_read_unlock(); 1379 return -ENODEV; 1380 } 1381 1382 ti = rcu_dereference(dp->table.ti); 1383 for (;;) { 1384 struct sw_flow *flow; 1385 u32 bucket, obj; 1386 1387 bucket = cb->args[0]; 1388 obj = cb->args[1]; 1389 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1390 if (!flow) 1391 break; 1392 1393 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1394 NETLINK_CB(cb->skb).portid, 1395 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1396 OVS_FLOW_CMD_GET, ufid_flags) < 0) 1397 break; 1398 1399 cb->args[0] = bucket; 1400 cb->args[1] = obj; 1401 } 1402 rcu_read_unlock(); 1403 return skb->len; 1404 } 1405 1406 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1407 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1408 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1409 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1410 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1411 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1412 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, 1413 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, 1414 }; 1415 1416 static const struct genl_ops dp_flow_genl_ops[] = { 1417 { .cmd = OVS_FLOW_CMD_NEW, 1418 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1419 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1420 .doit = ovs_flow_cmd_new 1421 }, 1422 { .cmd = OVS_FLOW_CMD_DEL, 1423 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1424 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1425 .doit = ovs_flow_cmd_del 1426 }, 1427 { .cmd = OVS_FLOW_CMD_GET, 1428 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1429 .flags = 0, /* OK for unprivileged users. */ 1430 .doit = ovs_flow_cmd_get, 1431 .dumpit = ovs_flow_cmd_dump 1432 }, 1433 { .cmd = OVS_FLOW_CMD_SET, 1434 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1435 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1436 .doit = ovs_flow_cmd_set, 1437 }, 1438 }; 1439 1440 static struct genl_family dp_flow_genl_family __ro_after_init = { 1441 .hdrsize = sizeof(struct ovs_header), 1442 .name = OVS_FLOW_FAMILY, 1443 .version = OVS_FLOW_VERSION, 1444 .maxattr = OVS_FLOW_ATTR_MAX, 1445 .policy = flow_policy, 1446 .netnsok = true, 1447 .parallel_ops = true, 1448 .ops = dp_flow_genl_ops, 1449 .n_ops = ARRAY_SIZE(dp_flow_genl_ops), 1450 .mcgrps = &ovs_dp_flow_multicast_group, 1451 .n_mcgrps = 1, 1452 .module = THIS_MODULE, 1453 }; 1454 1455 static size_t ovs_dp_cmd_msg_size(void) 1456 { 1457 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1458 1459 msgsize += nla_total_size(IFNAMSIZ); 1460 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats)); 1461 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats)); 1462 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1463 1464 return msgsize; 1465 } 1466 1467 /* Called with ovs_mutex. */ 1468 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1469 u32 portid, u32 seq, u32 flags, u8 cmd) 1470 { 1471 struct ovs_header *ovs_header; 1472 struct ovs_dp_stats dp_stats; 1473 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1474 int err; 1475 1476 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1477 flags, cmd); 1478 if (!ovs_header) 1479 goto error; 1480 1481 ovs_header->dp_ifindex = get_dpifindex(dp); 1482 1483 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1484 if (err) 1485 goto nla_put_failure; 1486 1487 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1488 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1489 &dp_stats, OVS_DP_ATTR_PAD)) 1490 goto nla_put_failure; 1491 1492 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1493 sizeof(struct ovs_dp_megaflow_stats), 1494 &dp_megaflow_stats, OVS_DP_ATTR_PAD)) 1495 goto nla_put_failure; 1496 1497 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1498 goto nla_put_failure; 1499 1500 genlmsg_end(skb, ovs_header); 1501 return 0; 1502 1503 nla_put_failure: 1504 genlmsg_cancel(skb, ovs_header); 1505 error: 1506 return -EMSGSIZE; 1507 } 1508 1509 static struct sk_buff *ovs_dp_cmd_alloc_info(void) 1510 { 1511 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL); 1512 } 1513 1514 /* Called with rcu_read_lock or ovs_mutex. */ 1515 static struct datapath *lookup_datapath(struct net *net, 1516 const struct ovs_header *ovs_header, 1517 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1518 { 1519 struct datapath *dp; 1520 1521 if (!a[OVS_DP_ATTR_NAME]) 1522 dp = get_dp(net, ovs_header->dp_ifindex); 1523 else { 1524 struct vport *vport; 1525 1526 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1527 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1528 } 1529 return dp ? dp : ERR_PTR(-ENODEV); 1530 } 1531 1532 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info) 1533 { 1534 struct datapath *dp; 1535 1536 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1537 if (IS_ERR(dp)) 1538 return; 1539 1540 WARN(dp->user_features, "Dropping previously announced user features\n"); 1541 dp->user_features = 0; 1542 } 1543 1544 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1545 { 1546 if (a[OVS_DP_ATTR_USER_FEATURES]) 1547 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1548 } 1549 1550 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1551 { 1552 struct nlattr **a = info->attrs; 1553 struct vport_parms parms; 1554 struct sk_buff *reply; 1555 struct datapath *dp; 1556 struct vport *vport; 1557 struct ovs_net *ovs_net; 1558 int err, i; 1559 1560 err = -EINVAL; 1561 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1562 goto err; 1563 1564 reply = ovs_dp_cmd_alloc_info(); 1565 if (!reply) 1566 return -ENOMEM; 1567 1568 err = -ENOMEM; 1569 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1570 if (dp == NULL) 1571 goto err_free_reply; 1572 1573 ovs_dp_set_net(dp, sock_net(skb->sk)); 1574 1575 /* Allocate table. */ 1576 err = ovs_flow_tbl_init(&dp->table); 1577 if (err) 1578 goto err_free_dp; 1579 1580 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1581 if (!dp->stats_percpu) { 1582 err = -ENOMEM; 1583 goto err_destroy_table; 1584 } 1585 1586 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS, 1587 sizeof(struct hlist_head), 1588 GFP_KERNEL); 1589 if (!dp->ports) { 1590 err = -ENOMEM; 1591 goto err_destroy_percpu; 1592 } 1593 1594 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1595 INIT_HLIST_HEAD(&dp->ports[i]); 1596 1597 err = ovs_meters_init(dp); 1598 if (err) 1599 goto err_destroy_ports_array; 1600 1601 /* Set up our datapath device. */ 1602 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1603 parms.type = OVS_VPORT_TYPE_INTERNAL; 1604 parms.options = NULL; 1605 parms.dp = dp; 1606 parms.port_no = OVSP_LOCAL; 1607 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1608 1609 ovs_dp_change(dp, a); 1610 1611 /* So far only local changes have been made, now need the lock. */ 1612 ovs_lock(); 1613 1614 vport = new_vport(&parms); 1615 if (IS_ERR(vport)) { 1616 err = PTR_ERR(vport); 1617 if (err == -EBUSY) 1618 err = -EEXIST; 1619 1620 if (err == -EEXIST) { 1621 /* An outdated user space instance that does not understand 1622 * the concept of user_features has attempted to create a new 1623 * datapath and is likely to reuse it. Drop all user features. 1624 */ 1625 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1626 ovs_dp_reset_user_features(skb, info); 1627 } 1628 1629 goto err_destroy_meters; 1630 } 1631 1632 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1633 info->snd_seq, 0, OVS_DP_CMD_NEW); 1634 BUG_ON(err < 0); 1635 1636 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1637 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1638 1639 ovs_unlock(); 1640 1641 ovs_notify(&dp_datapath_genl_family, reply, info); 1642 return 0; 1643 1644 err_destroy_meters: 1645 ovs_unlock(); 1646 ovs_meters_exit(dp); 1647 err_destroy_ports_array: 1648 kfree(dp->ports); 1649 err_destroy_percpu: 1650 free_percpu(dp->stats_percpu); 1651 err_destroy_table: 1652 ovs_flow_tbl_destroy(&dp->table); 1653 err_free_dp: 1654 kfree(dp); 1655 err_free_reply: 1656 kfree_skb(reply); 1657 err: 1658 return err; 1659 } 1660 1661 /* Called with ovs_mutex. */ 1662 static void __dp_destroy(struct datapath *dp) 1663 { 1664 int i; 1665 1666 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1667 struct vport *vport; 1668 struct hlist_node *n; 1669 1670 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1671 if (vport->port_no != OVSP_LOCAL) 1672 ovs_dp_detach_port(vport); 1673 } 1674 1675 list_del_rcu(&dp->list_node); 1676 1677 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1678 * all ports in datapath are destroyed first before freeing datapath. 1679 */ 1680 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1681 1682 /* RCU destroy the flow table */ 1683 call_rcu(&dp->rcu, destroy_dp_rcu); 1684 } 1685 1686 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1687 { 1688 struct sk_buff *reply; 1689 struct datapath *dp; 1690 int err; 1691 1692 reply = ovs_dp_cmd_alloc_info(); 1693 if (!reply) 1694 return -ENOMEM; 1695 1696 ovs_lock(); 1697 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1698 err = PTR_ERR(dp); 1699 if (IS_ERR(dp)) 1700 goto err_unlock_free; 1701 1702 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1703 info->snd_seq, 0, OVS_DP_CMD_DEL); 1704 BUG_ON(err < 0); 1705 1706 __dp_destroy(dp); 1707 ovs_unlock(); 1708 1709 ovs_notify(&dp_datapath_genl_family, reply, info); 1710 1711 return 0; 1712 1713 err_unlock_free: 1714 ovs_unlock(); 1715 kfree_skb(reply); 1716 return err; 1717 } 1718 1719 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1720 { 1721 struct sk_buff *reply; 1722 struct datapath *dp; 1723 int err; 1724 1725 reply = ovs_dp_cmd_alloc_info(); 1726 if (!reply) 1727 return -ENOMEM; 1728 1729 ovs_lock(); 1730 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1731 err = PTR_ERR(dp); 1732 if (IS_ERR(dp)) 1733 goto err_unlock_free; 1734 1735 ovs_dp_change(dp, info->attrs); 1736 1737 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1738 info->snd_seq, 0, OVS_DP_CMD_SET); 1739 BUG_ON(err < 0); 1740 1741 ovs_unlock(); 1742 ovs_notify(&dp_datapath_genl_family, reply, info); 1743 1744 return 0; 1745 1746 err_unlock_free: 1747 ovs_unlock(); 1748 kfree_skb(reply); 1749 return err; 1750 } 1751 1752 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1753 { 1754 struct sk_buff *reply; 1755 struct datapath *dp; 1756 int err; 1757 1758 reply = ovs_dp_cmd_alloc_info(); 1759 if (!reply) 1760 return -ENOMEM; 1761 1762 ovs_lock(); 1763 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1764 if (IS_ERR(dp)) { 1765 err = PTR_ERR(dp); 1766 goto err_unlock_free; 1767 } 1768 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1769 info->snd_seq, 0, OVS_DP_CMD_GET); 1770 BUG_ON(err < 0); 1771 ovs_unlock(); 1772 1773 return genlmsg_reply(reply, info); 1774 1775 err_unlock_free: 1776 ovs_unlock(); 1777 kfree_skb(reply); 1778 return err; 1779 } 1780 1781 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1782 { 1783 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1784 struct datapath *dp; 1785 int skip = cb->args[0]; 1786 int i = 0; 1787 1788 ovs_lock(); 1789 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1790 if (i >= skip && 1791 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1792 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1793 OVS_DP_CMD_GET) < 0) 1794 break; 1795 i++; 1796 } 1797 ovs_unlock(); 1798 1799 cb->args[0] = i; 1800 1801 return skb->len; 1802 } 1803 1804 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1805 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1806 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1807 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1808 }; 1809 1810 static const struct genl_ops dp_datapath_genl_ops[] = { 1811 { .cmd = OVS_DP_CMD_NEW, 1812 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1813 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1814 .doit = ovs_dp_cmd_new 1815 }, 1816 { .cmd = OVS_DP_CMD_DEL, 1817 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1818 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1819 .doit = ovs_dp_cmd_del 1820 }, 1821 { .cmd = OVS_DP_CMD_GET, 1822 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1823 .flags = 0, /* OK for unprivileged users. */ 1824 .doit = ovs_dp_cmd_get, 1825 .dumpit = ovs_dp_cmd_dump 1826 }, 1827 { .cmd = OVS_DP_CMD_SET, 1828 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1829 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1830 .doit = ovs_dp_cmd_set, 1831 }, 1832 }; 1833 1834 static struct genl_family dp_datapath_genl_family __ro_after_init = { 1835 .hdrsize = sizeof(struct ovs_header), 1836 .name = OVS_DATAPATH_FAMILY, 1837 .version = OVS_DATAPATH_VERSION, 1838 .maxattr = OVS_DP_ATTR_MAX, 1839 .policy = datapath_policy, 1840 .netnsok = true, 1841 .parallel_ops = true, 1842 .ops = dp_datapath_genl_ops, 1843 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops), 1844 .mcgrps = &ovs_dp_datapath_multicast_group, 1845 .n_mcgrps = 1, 1846 .module = THIS_MODULE, 1847 }; 1848 1849 /* Called with ovs_mutex or RCU read lock. */ 1850 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1851 struct net *net, u32 portid, u32 seq, 1852 u32 flags, u8 cmd) 1853 { 1854 struct ovs_header *ovs_header; 1855 struct ovs_vport_stats vport_stats; 1856 int err; 1857 1858 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1859 flags, cmd); 1860 if (!ovs_header) 1861 return -EMSGSIZE; 1862 1863 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1864 1865 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1866 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1867 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 1868 ovs_vport_name(vport)) || 1869 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex)) 1870 goto nla_put_failure; 1871 1872 if (!net_eq(net, dev_net(vport->dev))) { 1873 int id = peernet2id_alloc(net, dev_net(vport->dev)); 1874 1875 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id)) 1876 goto nla_put_failure; 1877 } 1878 1879 ovs_vport_get_stats(vport, &vport_stats); 1880 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS, 1881 sizeof(struct ovs_vport_stats), &vport_stats, 1882 OVS_VPORT_ATTR_PAD)) 1883 goto nla_put_failure; 1884 1885 if (ovs_vport_get_upcall_portids(vport, skb)) 1886 goto nla_put_failure; 1887 1888 err = ovs_vport_get_options(vport, skb); 1889 if (err == -EMSGSIZE) 1890 goto error; 1891 1892 genlmsg_end(skb, ovs_header); 1893 return 0; 1894 1895 nla_put_failure: 1896 err = -EMSGSIZE; 1897 error: 1898 genlmsg_cancel(skb, ovs_header); 1899 return err; 1900 } 1901 1902 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 1903 { 1904 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1905 } 1906 1907 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 1908 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net, 1909 u32 portid, u32 seq, u8 cmd) 1910 { 1911 struct sk_buff *skb; 1912 int retval; 1913 1914 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1915 if (!skb) 1916 return ERR_PTR(-ENOMEM); 1917 1918 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd); 1919 BUG_ON(retval < 0); 1920 1921 return skb; 1922 } 1923 1924 /* Called with ovs_mutex or RCU read lock. */ 1925 static struct vport *lookup_vport(struct net *net, 1926 const struct ovs_header *ovs_header, 1927 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1928 { 1929 struct datapath *dp; 1930 struct vport *vport; 1931 1932 if (a[OVS_VPORT_ATTR_IFINDEX]) 1933 return ERR_PTR(-EOPNOTSUPP); 1934 if (a[OVS_VPORT_ATTR_NAME]) { 1935 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 1936 if (!vport) 1937 return ERR_PTR(-ENODEV); 1938 if (ovs_header->dp_ifindex && 1939 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 1940 return ERR_PTR(-ENODEV); 1941 return vport; 1942 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 1943 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1944 1945 if (port_no >= DP_MAX_PORTS) 1946 return ERR_PTR(-EFBIG); 1947 1948 dp = get_dp(net, ovs_header->dp_ifindex); 1949 if (!dp) 1950 return ERR_PTR(-ENODEV); 1951 1952 vport = ovs_vport_ovsl_rcu(dp, port_no); 1953 if (!vport) 1954 return ERR_PTR(-ENODEV); 1955 return vport; 1956 } else 1957 return ERR_PTR(-EINVAL); 1958 1959 } 1960 1961 static unsigned int ovs_get_max_headroom(struct datapath *dp) 1962 { 1963 unsigned int dev_headroom, max_headroom = 0; 1964 struct net_device *dev; 1965 struct vport *vport; 1966 int i; 1967 1968 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1969 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 1970 dev = vport->dev; 1971 dev_headroom = netdev_get_fwd_headroom(dev); 1972 if (dev_headroom > max_headroom) 1973 max_headroom = dev_headroom; 1974 } 1975 } 1976 1977 return max_headroom; 1978 } 1979 1980 /* Called with ovs_mutex */ 1981 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom) 1982 { 1983 struct vport *vport; 1984 int i; 1985 1986 dp->max_headroom = new_headroom; 1987 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1988 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) 1989 netdev_set_rx_headroom(vport->dev, new_headroom); 1990 } 1991 1992 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 1993 { 1994 struct nlattr **a = info->attrs; 1995 struct ovs_header *ovs_header = info->userhdr; 1996 struct vport_parms parms; 1997 struct sk_buff *reply; 1998 struct vport *vport; 1999 struct datapath *dp; 2000 unsigned int new_headroom; 2001 u32 port_no; 2002 int err; 2003 2004 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 2005 !a[OVS_VPORT_ATTR_UPCALL_PID]) 2006 return -EINVAL; 2007 if (a[OVS_VPORT_ATTR_IFINDEX]) 2008 return -EOPNOTSUPP; 2009 2010 port_no = a[OVS_VPORT_ATTR_PORT_NO] 2011 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 2012 if (port_no >= DP_MAX_PORTS) 2013 return -EFBIG; 2014 2015 reply = ovs_vport_cmd_alloc_info(); 2016 if (!reply) 2017 return -ENOMEM; 2018 2019 ovs_lock(); 2020 restart: 2021 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 2022 err = -ENODEV; 2023 if (!dp) 2024 goto exit_unlock_free; 2025 2026 if (port_no) { 2027 vport = ovs_vport_ovsl(dp, port_no); 2028 err = -EBUSY; 2029 if (vport) 2030 goto exit_unlock_free; 2031 } else { 2032 for (port_no = 1; ; port_no++) { 2033 if (port_no >= DP_MAX_PORTS) { 2034 err = -EFBIG; 2035 goto exit_unlock_free; 2036 } 2037 vport = ovs_vport_ovsl(dp, port_no); 2038 if (!vport) 2039 break; 2040 } 2041 } 2042 2043 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 2044 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 2045 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 2046 parms.dp = dp; 2047 parms.port_no = port_no; 2048 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2049 2050 vport = new_vport(&parms); 2051 err = PTR_ERR(vport); 2052 if (IS_ERR(vport)) { 2053 if (err == -EAGAIN) 2054 goto restart; 2055 goto exit_unlock_free; 2056 } 2057 2058 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2059 info->snd_portid, info->snd_seq, 0, 2060 OVS_VPORT_CMD_NEW); 2061 2062 new_headroom = netdev_get_fwd_headroom(vport->dev); 2063 2064 if (new_headroom > dp->max_headroom) 2065 ovs_update_headroom(dp, new_headroom); 2066 else 2067 netdev_set_rx_headroom(vport->dev, dp->max_headroom); 2068 2069 BUG_ON(err < 0); 2070 ovs_unlock(); 2071 2072 ovs_notify(&dp_vport_genl_family, reply, info); 2073 return 0; 2074 2075 exit_unlock_free: 2076 ovs_unlock(); 2077 kfree_skb(reply); 2078 return err; 2079 } 2080 2081 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 2082 { 2083 struct nlattr **a = info->attrs; 2084 struct sk_buff *reply; 2085 struct vport *vport; 2086 int err; 2087 2088 reply = ovs_vport_cmd_alloc_info(); 2089 if (!reply) 2090 return -ENOMEM; 2091 2092 ovs_lock(); 2093 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2094 err = PTR_ERR(vport); 2095 if (IS_ERR(vport)) 2096 goto exit_unlock_free; 2097 2098 if (a[OVS_VPORT_ATTR_TYPE] && 2099 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 2100 err = -EINVAL; 2101 goto exit_unlock_free; 2102 } 2103 2104 if (a[OVS_VPORT_ATTR_OPTIONS]) { 2105 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 2106 if (err) 2107 goto exit_unlock_free; 2108 } 2109 2110 2111 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 2112 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2113 2114 err = ovs_vport_set_upcall_portids(vport, ids); 2115 if (err) 2116 goto exit_unlock_free; 2117 } 2118 2119 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2120 info->snd_portid, info->snd_seq, 0, 2121 OVS_VPORT_CMD_SET); 2122 BUG_ON(err < 0); 2123 2124 ovs_unlock(); 2125 ovs_notify(&dp_vport_genl_family, reply, info); 2126 return 0; 2127 2128 exit_unlock_free: 2129 ovs_unlock(); 2130 kfree_skb(reply); 2131 return err; 2132 } 2133 2134 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2135 { 2136 bool update_headroom = false; 2137 struct nlattr **a = info->attrs; 2138 struct sk_buff *reply; 2139 struct datapath *dp; 2140 struct vport *vport; 2141 unsigned int new_headroom; 2142 int err; 2143 2144 reply = ovs_vport_cmd_alloc_info(); 2145 if (!reply) 2146 return -ENOMEM; 2147 2148 ovs_lock(); 2149 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2150 err = PTR_ERR(vport); 2151 if (IS_ERR(vport)) 2152 goto exit_unlock_free; 2153 2154 if (vport->port_no == OVSP_LOCAL) { 2155 err = -EINVAL; 2156 goto exit_unlock_free; 2157 } 2158 2159 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2160 info->snd_portid, info->snd_seq, 0, 2161 OVS_VPORT_CMD_DEL); 2162 BUG_ON(err < 0); 2163 2164 /* the vport deletion may trigger dp headroom update */ 2165 dp = vport->dp; 2166 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom) 2167 update_headroom = true; 2168 2169 netdev_reset_rx_headroom(vport->dev); 2170 ovs_dp_detach_port(vport); 2171 2172 if (update_headroom) { 2173 new_headroom = ovs_get_max_headroom(dp); 2174 2175 if (new_headroom < dp->max_headroom) 2176 ovs_update_headroom(dp, new_headroom); 2177 } 2178 ovs_unlock(); 2179 2180 ovs_notify(&dp_vport_genl_family, reply, info); 2181 return 0; 2182 2183 exit_unlock_free: 2184 ovs_unlock(); 2185 kfree_skb(reply); 2186 return err; 2187 } 2188 2189 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2190 { 2191 struct nlattr **a = info->attrs; 2192 struct ovs_header *ovs_header = info->userhdr; 2193 struct sk_buff *reply; 2194 struct vport *vport; 2195 int err; 2196 2197 reply = ovs_vport_cmd_alloc_info(); 2198 if (!reply) 2199 return -ENOMEM; 2200 2201 rcu_read_lock(); 2202 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2203 err = PTR_ERR(vport); 2204 if (IS_ERR(vport)) 2205 goto exit_unlock_free; 2206 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2207 info->snd_portid, info->snd_seq, 0, 2208 OVS_VPORT_CMD_GET); 2209 BUG_ON(err < 0); 2210 rcu_read_unlock(); 2211 2212 return genlmsg_reply(reply, info); 2213 2214 exit_unlock_free: 2215 rcu_read_unlock(); 2216 kfree_skb(reply); 2217 return err; 2218 } 2219 2220 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2221 { 2222 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2223 struct datapath *dp; 2224 int bucket = cb->args[0], skip = cb->args[1]; 2225 int i, j = 0; 2226 2227 rcu_read_lock(); 2228 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2229 if (!dp) { 2230 rcu_read_unlock(); 2231 return -ENODEV; 2232 } 2233 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2234 struct vport *vport; 2235 2236 j = 0; 2237 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2238 if (j >= skip && 2239 ovs_vport_cmd_fill_info(vport, skb, 2240 sock_net(skb->sk), 2241 NETLINK_CB(cb->skb).portid, 2242 cb->nlh->nlmsg_seq, 2243 NLM_F_MULTI, 2244 OVS_VPORT_CMD_GET) < 0) 2245 goto out; 2246 2247 j++; 2248 } 2249 skip = 0; 2250 } 2251 out: 2252 rcu_read_unlock(); 2253 2254 cb->args[0] = i; 2255 cb->args[1] = j; 2256 2257 return skb->len; 2258 } 2259 2260 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2261 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2262 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2263 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2264 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2265 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 2266 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2267 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 }, 2268 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 }, 2269 }; 2270 2271 static const struct genl_ops dp_vport_genl_ops[] = { 2272 { .cmd = OVS_VPORT_CMD_NEW, 2273 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2274 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2275 .doit = ovs_vport_cmd_new 2276 }, 2277 { .cmd = OVS_VPORT_CMD_DEL, 2278 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2279 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2280 .doit = ovs_vport_cmd_del 2281 }, 2282 { .cmd = OVS_VPORT_CMD_GET, 2283 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2284 .flags = 0, /* OK for unprivileged users. */ 2285 .doit = ovs_vport_cmd_get, 2286 .dumpit = ovs_vport_cmd_dump 2287 }, 2288 { .cmd = OVS_VPORT_CMD_SET, 2289 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2290 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2291 .doit = ovs_vport_cmd_set, 2292 }, 2293 }; 2294 2295 struct genl_family dp_vport_genl_family __ro_after_init = { 2296 .hdrsize = sizeof(struct ovs_header), 2297 .name = OVS_VPORT_FAMILY, 2298 .version = OVS_VPORT_VERSION, 2299 .maxattr = OVS_VPORT_ATTR_MAX, 2300 .policy = vport_policy, 2301 .netnsok = true, 2302 .parallel_ops = true, 2303 .ops = dp_vport_genl_ops, 2304 .n_ops = ARRAY_SIZE(dp_vport_genl_ops), 2305 .mcgrps = &ovs_dp_vport_multicast_group, 2306 .n_mcgrps = 1, 2307 .module = THIS_MODULE, 2308 }; 2309 2310 static struct genl_family * const dp_genl_families[] = { 2311 &dp_datapath_genl_family, 2312 &dp_vport_genl_family, 2313 &dp_flow_genl_family, 2314 &dp_packet_genl_family, 2315 &dp_meter_genl_family, 2316 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 2317 &dp_ct_limit_genl_family, 2318 #endif 2319 }; 2320 2321 static void dp_unregister_genl(int n_families) 2322 { 2323 int i; 2324 2325 for (i = 0; i < n_families; i++) 2326 genl_unregister_family(dp_genl_families[i]); 2327 } 2328 2329 static int __init dp_register_genl(void) 2330 { 2331 int err; 2332 int i; 2333 2334 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2335 2336 err = genl_register_family(dp_genl_families[i]); 2337 if (err) 2338 goto error; 2339 } 2340 2341 return 0; 2342 2343 error: 2344 dp_unregister_genl(i); 2345 return err; 2346 } 2347 2348 static int __net_init ovs_init_net(struct net *net) 2349 { 2350 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2351 2352 INIT_LIST_HEAD(&ovs_net->dps); 2353 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2354 return ovs_ct_init(net); 2355 } 2356 2357 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2358 struct list_head *head) 2359 { 2360 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2361 struct datapath *dp; 2362 2363 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2364 int i; 2365 2366 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2367 struct vport *vport; 2368 2369 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2370 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2371 continue; 2372 2373 if (dev_net(vport->dev) == dnet) 2374 list_add(&vport->detach_list, head); 2375 } 2376 } 2377 } 2378 } 2379 2380 static void __net_exit ovs_exit_net(struct net *dnet) 2381 { 2382 struct datapath *dp, *dp_next; 2383 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2384 struct vport *vport, *vport_next; 2385 struct net *net; 2386 LIST_HEAD(head); 2387 2388 ovs_ct_exit(dnet); 2389 ovs_lock(); 2390 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2391 __dp_destroy(dp); 2392 2393 down_read(&net_rwsem); 2394 for_each_net(net) 2395 list_vports_from_net(net, dnet, &head); 2396 up_read(&net_rwsem); 2397 2398 /* Detach all vports from given namespace. */ 2399 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2400 list_del(&vport->detach_list); 2401 ovs_dp_detach_port(vport); 2402 } 2403 2404 ovs_unlock(); 2405 2406 cancel_work_sync(&ovs_net->dp_notify_work); 2407 } 2408 2409 static struct pernet_operations ovs_net_ops = { 2410 .init = ovs_init_net, 2411 .exit = ovs_exit_net, 2412 .id = &ovs_net_id, 2413 .size = sizeof(struct ovs_net), 2414 }; 2415 2416 static int __init dp_init(void) 2417 { 2418 int err; 2419 2420 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); 2421 2422 pr_info("Open vSwitch switching datapath\n"); 2423 2424 err = action_fifos_init(); 2425 if (err) 2426 goto error; 2427 2428 err = ovs_internal_dev_rtnl_link_register(); 2429 if (err) 2430 goto error_action_fifos_exit; 2431 2432 err = ovs_flow_init(); 2433 if (err) 2434 goto error_unreg_rtnl_link; 2435 2436 err = ovs_vport_init(); 2437 if (err) 2438 goto error_flow_exit; 2439 2440 err = register_pernet_device(&ovs_net_ops); 2441 if (err) 2442 goto error_vport_exit; 2443 2444 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2445 if (err) 2446 goto error_netns_exit; 2447 2448 err = ovs_netdev_init(); 2449 if (err) 2450 goto error_unreg_notifier; 2451 2452 err = dp_register_genl(); 2453 if (err < 0) 2454 goto error_unreg_netdev; 2455 2456 return 0; 2457 2458 error_unreg_netdev: 2459 ovs_netdev_exit(); 2460 error_unreg_notifier: 2461 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2462 error_netns_exit: 2463 unregister_pernet_device(&ovs_net_ops); 2464 error_vport_exit: 2465 ovs_vport_exit(); 2466 error_flow_exit: 2467 ovs_flow_exit(); 2468 error_unreg_rtnl_link: 2469 ovs_internal_dev_rtnl_link_unregister(); 2470 error_action_fifos_exit: 2471 action_fifos_exit(); 2472 error: 2473 return err; 2474 } 2475 2476 static void dp_cleanup(void) 2477 { 2478 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2479 ovs_netdev_exit(); 2480 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2481 unregister_pernet_device(&ovs_net_ops); 2482 rcu_barrier(); 2483 ovs_vport_exit(); 2484 ovs_flow_exit(); 2485 ovs_internal_dev_rtnl_link_unregister(); 2486 action_fifos_exit(); 2487 } 2488 2489 module_init(dp_init); 2490 module_exit(dp_cleanup); 2491 2492 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2493 MODULE_LICENSE("GPL"); 2494 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY); 2495 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY); 2496 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY); 2497 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY); 2498 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY); 2499 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY); 2500