1 /* 2 * Copyright (c) 2007-2014 Nicira, Inc. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of version 2 of the GNU General Public 6 * License as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 * General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program; if not, write to the Free Software 15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 16 * 02110-1301, USA 17 */ 18 19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 20 21 #include <linux/init.h> 22 #include <linux/module.h> 23 #include <linux/if_arp.h> 24 #include <linux/if_vlan.h> 25 #include <linux/in.h> 26 #include <linux/ip.h> 27 #include <linux/jhash.h> 28 #include <linux/delay.h> 29 #include <linux/time.h> 30 #include <linux/etherdevice.h> 31 #include <linux/genetlink.h> 32 #include <linux/kernel.h> 33 #include <linux/kthread.h> 34 #include <linux/mutex.h> 35 #include <linux/percpu.h> 36 #include <linux/rcupdate.h> 37 #include <linux/tcp.h> 38 #include <linux/udp.h> 39 #include <linux/ethtool.h> 40 #include <linux/wait.h> 41 #include <asm/div64.h> 42 #include <linux/highmem.h> 43 #include <linux/netfilter_bridge.h> 44 #include <linux/netfilter_ipv4.h> 45 #include <linux/inetdevice.h> 46 #include <linux/list.h> 47 #include <linux/openvswitch.h> 48 #include <linux/rculist.h> 49 #include <linux/dmi.h> 50 #include <net/genetlink.h> 51 #include <net/net_namespace.h> 52 #include <net/netns/generic.h> 53 54 #include "datapath.h" 55 #include "flow.h" 56 #include "flow_table.h" 57 #include "flow_netlink.h" 58 #include "vport-internal_dev.h" 59 #include "vport-netdev.h" 60 61 int ovs_net_id __read_mostly; 62 EXPORT_SYMBOL_GPL(ovs_net_id); 63 64 static struct genl_family dp_packet_genl_family; 65 static struct genl_family dp_flow_genl_family; 66 static struct genl_family dp_datapath_genl_family; 67 68 static const struct nla_policy flow_policy[]; 69 70 static const struct genl_multicast_group ovs_dp_flow_multicast_group = { 71 .name = OVS_FLOW_MCGROUP, 72 }; 73 74 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = { 75 .name = OVS_DATAPATH_MCGROUP, 76 }; 77 78 static const struct genl_multicast_group ovs_dp_vport_multicast_group = { 79 .name = OVS_VPORT_MCGROUP, 80 }; 81 82 /* Check if need to build a reply message. 83 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */ 84 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info, 85 unsigned int group) 86 { 87 return info->nlhdr->nlmsg_flags & NLM_F_ECHO || 88 genl_has_listeners(family, genl_info_net(info), group); 89 } 90 91 static void ovs_notify(struct genl_family *family, 92 struct sk_buff *skb, struct genl_info *info) 93 { 94 genl_notify(family, skb, genl_info_net(info), info->snd_portid, 95 0, info->nlhdr, GFP_KERNEL); 96 } 97 98 /** 99 * DOC: Locking: 100 * 101 * All writes e.g. Writes to device state (add/remove datapath, port, set 102 * operations on vports, etc.), Writes to other state (flow table 103 * modifications, set miscellaneous datapath parameters, etc.) are protected 104 * by ovs_lock. 105 * 106 * Reads are protected by RCU. 107 * 108 * There are a few special cases (mostly stats) that have their own 109 * synchronization but they nest under all of above and don't interact with 110 * each other. 111 * 112 * The RTNL lock nests inside ovs_mutex. 113 */ 114 115 static DEFINE_MUTEX(ovs_mutex); 116 117 void ovs_lock(void) 118 { 119 mutex_lock(&ovs_mutex); 120 } 121 122 void ovs_unlock(void) 123 { 124 mutex_unlock(&ovs_mutex); 125 } 126 127 #ifdef CONFIG_LOCKDEP 128 int lockdep_ovsl_is_held(void) 129 { 130 if (debug_locks) 131 return lockdep_is_held(&ovs_mutex); 132 else 133 return 1; 134 } 135 EXPORT_SYMBOL_GPL(lockdep_ovsl_is_held); 136 #endif 137 138 static struct vport *new_vport(const struct vport_parms *); 139 static int queue_gso_packets(struct datapath *dp, struct sk_buff *, 140 const struct sw_flow_key *, 141 const struct dp_upcall_info *); 142 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *, 143 const struct sw_flow_key *, 144 const struct dp_upcall_info *); 145 146 /* Must be called with rcu_read_lock. */ 147 static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex) 148 { 149 struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex); 150 151 if (dev) { 152 struct vport *vport = ovs_internal_dev_get_vport(dev); 153 if (vport) 154 return vport->dp; 155 } 156 157 return NULL; 158 } 159 160 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the 161 * returned dp pointer valid. 162 */ 163 static inline struct datapath *get_dp(struct net *net, int dp_ifindex) 164 { 165 struct datapath *dp; 166 167 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); 168 rcu_read_lock(); 169 dp = get_dp_rcu(net, dp_ifindex); 170 rcu_read_unlock(); 171 172 return dp; 173 } 174 175 /* Must be called with rcu_read_lock or ovs_mutex. */ 176 const char *ovs_dp_name(const struct datapath *dp) 177 { 178 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); 179 return vport->ops->get_name(vport); 180 } 181 182 static int get_dpifindex(const struct datapath *dp) 183 { 184 struct vport *local; 185 int ifindex; 186 187 rcu_read_lock(); 188 189 local = ovs_vport_rcu(dp, OVSP_LOCAL); 190 if (local) 191 ifindex = netdev_vport_priv(local)->dev->ifindex; 192 else 193 ifindex = 0; 194 195 rcu_read_unlock(); 196 197 return ifindex; 198 } 199 200 static void destroy_dp_rcu(struct rcu_head *rcu) 201 { 202 struct datapath *dp = container_of(rcu, struct datapath, rcu); 203 204 ovs_flow_tbl_destroy(&dp->table); 205 free_percpu(dp->stats_percpu); 206 release_net(ovs_dp_get_net(dp)); 207 kfree(dp->ports); 208 kfree(dp); 209 } 210 211 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 212 u16 port_no) 213 { 214 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 215 } 216 217 /* Called with ovs_mutex or RCU read lock. */ 218 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 219 { 220 struct vport *vport; 221 struct hlist_head *head; 222 223 head = vport_hash_bucket(dp, port_no); 224 hlist_for_each_entry_rcu(vport, head, dp_hash_node) { 225 if (vport->port_no == port_no) 226 return vport; 227 } 228 return NULL; 229 } 230 231 /* Called with ovs_mutex. */ 232 static struct vport *new_vport(const struct vport_parms *parms) 233 { 234 struct vport *vport; 235 236 vport = ovs_vport_add(parms); 237 if (!IS_ERR(vport)) { 238 struct datapath *dp = parms->dp; 239 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 240 241 hlist_add_head_rcu(&vport->dp_hash_node, head); 242 } 243 return vport; 244 } 245 246 void ovs_dp_detach_port(struct vport *p) 247 { 248 ASSERT_OVSL(); 249 250 /* First drop references to device. */ 251 hlist_del_rcu(&p->dp_hash_node); 252 253 /* Then destroy it. */ 254 ovs_vport_del(p); 255 } 256 257 /* Must be called with rcu_read_lock. */ 258 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key) 259 { 260 const struct vport *p = OVS_CB(skb)->input_vport; 261 struct datapath *dp = p->dp; 262 struct sw_flow *flow; 263 struct sw_flow_actions *sf_acts; 264 struct dp_stats_percpu *stats; 265 u64 *stats_counter; 266 u32 n_mask_hit; 267 268 stats = this_cpu_ptr(dp->stats_percpu); 269 270 /* Look up flow. */ 271 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit); 272 if (unlikely(!flow)) { 273 struct dp_upcall_info upcall; 274 int error; 275 276 upcall.cmd = OVS_PACKET_CMD_MISS; 277 upcall.userdata = NULL; 278 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 279 upcall.egress_tun_info = NULL; 280 error = ovs_dp_upcall(dp, skb, key, &upcall); 281 if (unlikely(error)) 282 kfree_skb(skb); 283 else 284 consume_skb(skb); 285 stats_counter = &stats->n_missed; 286 goto out; 287 } 288 289 ovs_flow_stats_update(flow, key->tp.flags, skb); 290 sf_acts = rcu_dereference(flow->sf_acts); 291 ovs_execute_actions(dp, skb, sf_acts, key); 292 293 stats_counter = &stats->n_hit; 294 295 out: 296 /* Update datapath statistics. */ 297 u64_stats_update_begin(&stats->syncp); 298 (*stats_counter)++; 299 stats->n_mask_hit += n_mask_hit; 300 u64_stats_update_end(&stats->syncp); 301 } 302 303 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 304 const struct sw_flow_key *key, 305 const struct dp_upcall_info *upcall_info) 306 { 307 struct dp_stats_percpu *stats; 308 int err; 309 310 if (upcall_info->portid == 0) { 311 err = -ENOTCONN; 312 goto err; 313 } 314 315 if (!skb_is_gso(skb)) 316 err = queue_userspace_packet(dp, skb, key, upcall_info); 317 else 318 err = queue_gso_packets(dp, skb, key, upcall_info); 319 if (err) 320 goto err; 321 322 return 0; 323 324 err: 325 stats = this_cpu_ptr(dp->stats_percpu); 326 327 u64_stats_update_begin(&stats->syncp); 328 stats->n_lost++; 329 u64_stats_update_end(&stats->syncp); 330 331 return err; 332 } 333 334 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 335 const struct sw_flow_key *key, 336 const struct dp_upcall_info *upcall_info) 337 { 338 unsigned short gso_type = skb_shinfo(skb)->gso_type; 339 struct sw_flow_key later_key; 340 struct sk_buff *segs, *nskb; 341 struct ovs_skb_cb ovs_cb; 342 int err; 343 344 ovs_cb = *OVS_CB(skb); 345 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 346 *OVS_CB(skb) = ovs_cb; 347 if (IS_ERR(segs)) 348 return PTR_ERR(segs); 349 if (segs == NULL) 350 return -EINVAL; 351 352 if (gso_type & SKB_GSO_UDP) { 353 /* The initial flow key extracted by ovs_flow_key_extract() 354 * in this case is for a first fragment, so we need to 355 * properly mark later fragments. 356 */ 357 later_key = *key; 358 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 359 } 360 361 /* Queue all of the segments. */ 362 skb = segs; 363 do { 364 *OVS_CB(skb) = ovs_cb; 365 if (gso_type & SKB_GSO_UDP && skb != segs) 366 key = &later_key; 367 368 err = queue_userspace_packet(dp, skb, key, upcall_info); 369 if (err) 370 break; 371 372 } while ((skb = skb->next)); 373 374 /* Free all of the segments. */ 375 skb = segs; 376 do { 377 nskb = skb->next; 378 if (err) 379 kfree_skb(skb); 380 else 381 consume_skb(skb); 382 } while ((skb = nskb)); 383 return err; 384 } 385 386 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, 387 unsigned int hdrlen) 388 { 389 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 390 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 391 + nla_total_size(ovs_key_attr_size()); /* OVS_PACKET_ATTR_KEY */ 392 393 /* OVS_PACKET_ATTR_USERDATA */ 394 if (upcall_info->userdata) 395 size += NLA_ALIGN(upcall_info->userdata->nla_len); 396 397 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ 398 if (upcall_info->egress_tun_info) 399 size += nla_total_size(ovs_tun_key_attr_size()); 400 401 return size; 402 } 403 404 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 405 const struct sw_flow_key *key, 406 const struct dp_upcall_info *upcall_info) 407 { 408 struct ovs_header *upcall; 409 struct sk_buff *nskb = NULL; 410 struct sk_buff *user_skb = NULL; /* to be queued to userspace */ 411 struct nlattr *nla; 412 struct genl_info info = { 413 .dst_sk = ovs_dp_get_net(dp)->genl_sock, 414 .snd_portid = upcall_info->portid, 415 }; 416 size_t len; 417 unsigned int hlen; 418 int err, dp_ifindex; 419 420 dp_ifindex = get_dpifindex(dp); 421 if (!dp_ifindex) 422 return -ENODEV; 423 424 if (skb_vlan_tag_present(skb)) { 425 nskb = skb_clone(skb, GFP_ATOMIC); 426 if (!nskb) 427 return -ENOMEM; 428 429 nskb = __vlan_hwaccel_push_inside(nskb); 430 if (!nskb) 431 return -ENOMEM; 432 433 skb = nskb; 434 } 435 436 if (nla_attr_size(skb->len) > USHRT_MAX) { 437 err = -EFBIG; 438 goto out; 439 } 440 441 /* Complete checksum if needed */ 442 if (skb->ip_summed == CHECKSUM_PARTIAL && 443 (err = skb_checksum_help(skb))) 444 goto out; 445 446 /* Older versions of OVS user space enforce alignment of the last 447 * Netlink attribute to NLA_ALIGNTO which would require extensive 448 * padding logic. Only perform zerocopy if padding is not required. 449 */ 450 if (dp->user_features & OVS_DP_F_UNALIGNED) 451 hlen = skb_zerocopy_headlen(skb); 452 else 453 hlen = skb->len; 454 455 len = upcall_msg_size(upcall_info, hlen); 456 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC); 457 if (!user_skb) { 458 err = -ENOMEM; 459 goto out; 460 } 461 462 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 463 0, upcall_info->cmd); 464 upcall->dp_ifindex = dp_ifindex; 465 466 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); 467 BUG_ON(err); 468 469 if (upcall_info->userdata) 470 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 471 nla_len(upcall_info->userdata), 472 nla_data(upcall_info->userdata)); 473 474 if (upcall_info->egress_tun_info) { 475 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY); 476 err = ovs_nla_put_egress_tunnel_key(user_skb, 477 upcall_info->egress_tun_info); 478 BUG_ON(err); 479 nla_nest_end(user_skb, nla); 480 } 481 482 /* Only reserve room for attribute header, packet data is added 483 * in skb_zerocopy() */ 484 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 485 err = -ENOBUFS; 486 goto out; 487 } 488 nla->nla_len = nla_attr_size(skb->len); 489 490 err = skb_zerocopy(user_skb, skb, skb->len, hlen); 491 if (err) 492 goto out; 493 494 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 495 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 496 size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len; 497 498 if (plen > 0) 499 memset(skb_put(user_skb, plen), 0, plen); 500 } 501 502 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 503 504 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 505 user_skb = NULL; 506 out: 507 if (err) 508 skb_tx_error(skb); 509 kfree_skb(user_skb); 510 kfree_skb(nskb); 511 return err; 512 } 513 514 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 515 { 516 struct ovs_header *ovs_header = info->userhdr; 517 struct nlattr **a = info->attrs; 518 struct sw_flow_actions *acts; 519 struct sk_buff *packet; 520 struct sw_flow *flow; 521 struct sw_flow_actions *sf_acts; 522 struct datapath *dp; 523 struct ethhdr *eth; 524 struct vport *input_vport; 525 int len; 526 int err; 527 bool log = !a[OVS_PACKET_ATTR_PROBE]; 528 529 err = -EINVAL; 530 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 531 !a[OVS_PACKET_ATTR_ACTIONS]) 532 goto err; 533 534 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 535 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 536 err = -ENOMEM; 537 if (!packet) 538 goto err; 539 skb_reserve(packet, NET_IP_ALIGN); 540 541 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 542 543 skb_reset_mac_header(packet); 544 eth = eth_hdr(packet); 545 546 /* Normally, setting the skb 'protocol' field would be handled by a 547 * call to eth_type_trans(), but it assumes there's a sending 548 * device, which we may not have. */ 549 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) 550 packet->protocol = eth->h_proto; 551 else 552 packet->protocol = htons(ETH_P_802_2); 553 554 /* Build an sw_flow for sending this packet. */ 555 flow = ovs_flow_alloc(); 556 err = PTR_ERR(flow); 557 if (IS_ERR(flow)) 558 goto err_kfree_skb; 559 560 err = ovs_flow_key_extract_userspace(a[OVS_PACKET_ATTR_KEY], packet, 561 &flow->key, log); 562 if (err) 563 goto err_flow_free; 564 565 err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS], 566 &flow->key, &acts, log); 567 if (err) 568 goto err_flow_free; 569 570 rcu_assign_pointer(flow->sf_acts, acts); 571 OVS_CB(packet)->egress_tun_info = NULL; 572 packet->priority = flow->key.phy.priority; 573 packet->mark = flow->key.phy.skb_mark; 574 575 rcu_read_lock(); 576 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 577 err = -ENODEV; 578 if (!dp) 579 goto err_unlock; 580 581 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 582 if (!input_vport) 583 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 584 585 if (!input_vport) 586 goto err_unlock; 587 588 OVS_CB(packet)->input_vport = input_vport; 589 sf_acts = rcu_dereference(flow->sf_acts); 590 591 local_bh_disable(); 592 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); 593 local_bh_enable(); 594 rcu_read_unlock(); 595 596 ovs_flow_free(flow, false); 597 return err; 598 599 err_unlock: 600 rcu_read_unlock(); 601 err_flow_free: 602 ovs_flow_free(flow, false); 603 err_kfree_skb: 604 kfree_skb(packet); 605 err: 606 return err; 607 } 608 609 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 610 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 611 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 612 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 613 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, 614 }; 615 616 static const struct genl_ops dp_packet_genl_ops[] = { 617 { .cmd = OVS_PACKET_CMD_EXECUTE, 618 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 619 .policy = packet_policy, 620 .doit = ovs_packet_cmd_execute 621 } 622 }; 623 624 static struct genl_family dp_packet_genl_family = { 625 .id = GENL_ID_GENERATE, 626 .hdrsize = sizeof(struct ovs_header), 627 .name = OVS_PACKET_FAMILY, 628 .version = OVS_PACKET_VERSION, 629 .maxattr = OVS_PACKET_ATTR_MAX, 630 .netnsok = true, 631 .parallel_ops = true, 632 .ops = dp_packet_genl_ops, 633 .n_ops = ARRAY_SIZE(dp_packet_genl_ops), 634 }; 635 636 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 637 struct ovs_dp_megaflow_stats *mega_stats) 638 { 639 int i; 640 641 memset(mega_stats, 0, sizeof(*mega_stats)); 642 643 stats->n_flows = ovs_flow_tbl_count(&dp->table); 644 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 645 646 stats->n_hit = stats->n_missed = stats->n_lost = 0; 647 648 for_each_possible_cpu(i) { 649 const struct dp_stats_percpu *percpu_stats; 650 struct dp_stats_percpu local_stats; 651 unsigned int start; 652 653 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 654 655 do { 656 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 657 local_stats = *percpu_stats; 658 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 659 660 stats->n_hit += local_stats.n_hit; 661 stats->n_missed += local_stats.n_missed; 662 stats->n_lost += local_stats.n_lost; 663 mega_stats->n_mask_hit += local_stats.n_mask_hit; 664 } 665 } 666 667 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) 668 { 669 return ovs_identifier_is_ufid(sfid) && 670 !(ufid_flags & OVS_UFID_F_OMIT_KEY); 671 } 672 673 static bool should_fill_mask(uint32_t ufid_flags) 674 { 675 return !(ufid_flags & OVS_UFID_F_OMIT_MASK); 676 } 677 678 static bool should_fill_actions(uint32_t ufid_flags) 679 { 680 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); 681 } 682 683 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, 684 const struct sw_flow_id *sfid, 685 uint32_t ufid_flags) 686 { 687 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); 688 689 /* OVS_FLOW_ATTR_UFID */ 690 if (sfid && ovs_identifier_is_ufid(sfid)) 691 len += nla_total_size(sfid->ufid_len); 692 693 /* OVS_FLOW_ATTR_KEY */ 694 if (!sfid || should_fill_key(sfid, ufid_flags)) 695 len += nla_total_size(ovs_key_attr_size()); 696 697 /* OVS_FLOW_ATTR_MASK */ 698 if (should_fill_mask(ufid_flags)) 699 len += nla_total_size(ovs_key_attr_size()); 700 701 /* OVS_FLOW_ATTR_ACTIONS */ 702 if (should_fill_actions(ufid_flags)) 703 len += nla_total_size(acts->actions_len); 704 705 return len 706 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 707 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 708 + nla_total_size(8); /* OVS_FLOW_ATTR_USED */ 709 } 710 711 /* Called with ovs_mutex or RCU read lock. */ 712 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 713 struct sk_buff *skb) 714 { 715 struct ovs_flow_stats stats; 716 __be16 tcp_flags; 717 unsigned long used; 718 719 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 720 721 if (used && 722 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used))) 723 return -EMSGSIZE; 724 725 if (stats.n_packets && 726 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats)) 727 return -EMSGSIZE; 728 729 if ((u8)ntohs(tcp_flags) && 730 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 731 return -EMSGSIZE; 732 733 return 0; 734 } 735 736 /* Called with ovs_mutex or RCU read lock. */ 737 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 738 struct sk_buff *skb, int skb_orig_len) 739 { 740 struct nlattr *start; 741 int err; 742 743 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 744 * this is the first flow to be dumped into 'skb'. This is unusual for 745 * Netlink but individual action lists can be longer than 746 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 747 * The userspace caller can always fetch the actions separately if it 748 * really wants them. (Most userspace callers in fact don't care.) 749 * 750 * This can only fail for dump operations because the skb is always 751 * properly sized for single flows. 752 */ 753 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS); 754 if (start) { 755 const struct sw_flow_actions *sf_acts; 756 757 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 758 err = ovs_nla_put_actions(sf_acts->actions, 759 sf_acts->actions_len, skb); 760 761 if (!err) 762 nla_nest_end(skb, start); 763 else { 764 if (skb_orig_len) 765 return err; 766 767 nla_nest_cancel(skb, start); 768 } 769 } else if (skb_orig_len) { 770 return -EMSGSIZE; 771 } 772 773 return 0; 774 } 775 776 /* Called with ovs_mutex or RCU read lock. */ 777 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 778 struct sk_buff *skb, u32 portid, 779 u32 seq, u32 flags, u8 cmd, u32 ufid_flags) 780 { 781 const int skb_orig_len = skb->len; 782 struct ovs_header *ovs_header; 783 int err; 784 785 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 786 flags, cmd); 787 if (!ovs_header) 788 return -EMSGSIZE; 789 790 ovs_header->dp_ifindex = dp_ifindex; 791 792 err = ovs_nla_put_identifier(flow, skb); 793 if (err) 794 goto error; 795 796 if (should_fill_key(&flow->id, ufid_flags)) { 797 err = ovs_nla_put_masked_key(flow, skb); 798 if (err) 799 goto error; 800 } 801 802 if (should_fill_mask(ufid_flags)) { 803 err = ovs_nla_put_mask(flow, skb); 804 if (err) 805 goto error; 806 } 807 808 err = ovs_flow_cmd_fill_stats(flow, skb); 809 if (err) 810 goto error; 811 812 if (should_fill_actions(ufid_flags)) { 813 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 814 if (err) 815 goto error; 816 } 817 818 genlmsg_end(skb, ovs_header); 819 return 0; 820 821 error: 822 genlmsg_cancel(skb, ovs_header); 823 return err; 824 } 825 826 /* May not be called with RCU read lock. */ 827 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 828 const struct sw_flow_id *sfid, 829 struct genl_info *info, 830 bool always, 831 uint32_t ufid_flags) 832 { 833 struct sk_buff *skb; 834 size_t len; 835 836 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 837 return NULL; 838 839 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); 840 skb = genlmsg_new_unicast(len, info, GFP_KERNEL); 841 if (!skb) 842 return ERR_PTR(-ENOMEM); 843 844 return skb; 845 } 846 847 /* Called with ovs_mutex. */ 848 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 849 int dp_ifindex, 850 struct genl_info *info, u8 cmd, 851 bool always, u32 ufid_flags) 852 { 853 struct sk_buff *skb; 854 int retval; 855 856 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), 857 &flow->id, info, always, ufid_flags); 858 if (IS_ERR_OR_NULL(skb)) 859 return skb; 860 861 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 862 info->snd_portid, info->snd_seq, 0, 863 cmd, ufid_flags); 864 BUG_ON(retval < 0); 865 return skb; 866 } 867 868 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 869 { 870 struct nlattr **a = info->attrs; 871 struct ovs_header *ovs_header = info->userhdr; 872 struct sw_flow *flow = NULL, *new_flow; 873 struct sw_flow_mask mask; 874 struct sk_buff *reply; 875 struct datapath *dp; 876 struct sw_flow_key key; 877 struct sw_flow_actions *acts; 878 struct sw_flow_match match; 879 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 880 int error; 881 bool log = !a[OVS_FLOW_ATTR_PROBE]; 882 883 /* Must have key and actions. */ 884 error = -EINVAL; 885 if (!a[OVS_FLOW_ATTR_KEY]) { 886 OVS_NLERR(log, "Flow key attr not present in new flow."); 887 goto error; 888 } 889 if (!a[OVS_FLOW_ATTR_ACTIONS]) { 890 OVS_NLERR(log, "Flow actions attr not present in new flow."); 891 goto error; 892 } 893 894 /* Most of the time we need to allocate a new flow, do it before 895 * locking. 896 */ 897 new_flow = ovs_flow_alloc(); 898 if (IS_ERR(new_flow)) { 899 error = PTR_ERR(new_flow); 900 goto error; 901 } 902 903 /* Extract key. */ 904 ovs_match_init(&match, &key, &mask); 905 error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], 906 a[OVS_FLOW_ATTR_MASK], log); 907 if (error) 908 goto err_kfree_flow; 909 910 ovs_flow_mask_key(&new_flow->key, &key, &mask); 911 912 /* Extract flow identifier. */ 913 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID], 914 &key, log); 915 if (error) 916 goto err_kfree_flow; 917 918 /* Validate actions. */ 919 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &new_flow->key, 920 &acts, log); 921 if (error) { 922 OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); 923 goto err_kfree_flow; 924 } 925 926 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false, 927 ufid_flags); 928 if (IS_ERR(reply)) { 929 error = PTR_ERR(reply); 930 goto err_kfree_acts; 931 } 932 933 ovs_lock(); 934 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 935 if (unlikely(!dp)) { 936 error = -ENODEV; 937 goto err_unlock_ovs; 938 } 939 940 /* Check if this is a duplicate flow */ 941 if (ovs_identifier_is_ufid(&new_flow->id)) 942 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id); 943 if (!flow) 944 flow = ovs_flow_tbl_lookup(&dp->table, &key); 945 if (likely(!flow)) { 946 rcu_assign_pointer(new_flow->sf_acts, acts); 947 948 /* Put flow in bucket. */ 949 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 950 if (unlikely(error)) { 951 acts = NULL; 952 goto err_unlock_ovs; 953 } 954 955 if (unlikely(reply)) { 956 error = ovs_flow_cmd_fill_info(new_flow, 957 ovs_header->dp_ifindex, 958 reply, info->snd_portid, 959 info->snd_seq, 0, 960 OVS_FLOW_CMD_NEW, 961 ufid_flags); 962 BUG_ON(error < 0); 963 } 964 ovs_unlock(); 965 } else { 966 struct sw_flow_actions *old_acts; 967 968 /* Bail out if we're not allowed to modify an existing flow. 969 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 970 * because Generic Netlink treats the latter as a dump 971 * request. We also accept NLM_F_EXCL in case that bug ever 972 * gets fixed. 973 */ 974 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 975 | NLM_F_EXCL))) { 976 error = -EEXIST; 977 goto err_unlock_ovs; 978 } 979 /* The flow identifier has to be the same for flow updates. 980 * Look for any overlapping flow. 981 */ 982 if (unlikely(!ovs_flow_cmp(flow, &match))) { 983 if (ovs_identifier_is_key(&flow->id)) 984 flow = ovs_flow_tbl_lookup_exact(&dp->table, 985 &match); 986 else /* UFID matches but key is different */ 987 flow = NULL; 988 if (!flow) { 989 error = -ENOENT; 990 goto err_unlock_ovs; 991 } 992 } 993 /* Update actions. */ 994 old_acts = ovsl_dereference(flow->sf_acts); 995 rcu_assign_pointer(flow->sf_acts, acts); 996 997 if (unlikely(reply)) { 998 error = ovs_flow_cmd_fill_info(flow, 999 ovs_header->dp_ifindex, 1000 reply, info->snd_portid, 1001 info->snd_seq, 0, 1002 OVS_FLOW_CMD_NEW, 1003 ufid_flags); 1004 BUG_ON(error < 0); 1005 } 1006 ovs_unlock(); 1007 1008 ovs_nla_free_flow_actions(old_acts); 1009 ovs_flow_free(new_flow, false); 1010 } 1011 1012 if (reply) 1013 ovs_notify(&dp_flow_genl_family, reply, info); 1014 return 0; 1015 1016 err_unlock_ovs: 1017 ovs_unlock(); 1018 kfree_skb(reply); 1019 err_kfree_acts: 1020 kfree(acts); 1021 err_kfree_flow: 1022 ovs_flow_free(new_flow, false); 1023 error: 1024 return error; 1025 } 1026 1027 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ 1028 static struct sw_flow_actions *get_flow_actions(const struct nlattr *a, 1029 const struct sw_flow_key *key, 1030 const struct sw_flow_mask *mask, 1031 bool log) 1032 { 1033 struct sw_flow_actions *acts; 1034 struct sw_flow_key masked_key; 1035 int error; 1036 1037 ovs_flow_mask_key(&masked_key, key, mask); 1038 error = ovs_nla_copy_actions(a, &masked_key, &acts, log); 1039 if (error) { 1040 OVS_NLERR(log, 1041 "Actions may not be safe on all matching packets"); 1042 return ERR_PTR(error); 1043 } 1044 1045 return acts; 1046 } 1047 1048 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 1049 { 1050 struct nlattr **a = info->attrs; 1051 struct ovs_header *ovs_header = info->userhdr; 1052 struct sw_flow_key key; 1053 struct sw_flow *flow; 1054 struct sw_flow_mask mask; 1055 struct sk_buff *reply = NULL; 1056 struct datapath *dp; 1057 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 1058 struct sw_flow_match match; 1059 struct sw_flow_id sfid; 1060 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1061 int error; 1062 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1063 bool ufid_present; 1064 1065 /* Extract key. */ 1066 error = -EINVAL; 1067 if (!a[OVS_FLOW_ATTR_KEY]) { 1068 OVS_NLERR(log, "Flow key attribute not present in set flow."); 1069 goto error; 1070 } 1071 1072 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); 1073 ovs_match_init(&match, &key, &mask); 1074 error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], 1075 a[OVS_FLOW_ATTR_MASK], log); 1076 if (error) 1077 goto error; 1078 1079 /* Validate actions. */ 1080 if (a[OVS_FLOW_ATTR_ACTIONS]) { 1081 acts = get_flow_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, &mask, 1082 log); 1083 if (IS_ERR(acts)) { 1084 error = PTR_ERR(acts); 1085 goto error; 1086 } 1087 1088 /* Can allocate before locking if have acts. */ 1089 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false, 1090 ufid_flags); 1091 if (IS_ERR(reply)) { 1092 error = PTR_ERR(reply); 1093 goto err_kfree_acts; 1094 } 1095 } 1096 1097 ovs_lock(); 1098 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1099 if (unlikely(!dp)) { 1100 error = -ENODEV; 1101 goto err_unlock_ovs; 1102 } 1103 /* Check that the flow exists. */ 1104 if (ufid_present) 1105 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid); 1106 else 1107 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1108 if (unlikely(!flow)) { 1109 error = -ENOENT; 1110 goto err_unlock_ovs; 1111 } 1112 1113 /* Update actions, if present. */ 1114 if (likely(acts)) { 1115 old_acts = ovsl_dereference(flow->sf_acts); 1116 rcu_assign_pointer(flow->sf_acts, acts); 1117 1118 if (unlikely(reply)) { 1119 error = ovs_flow_cmd_fill_info(flow, 1120 ovs_header->dp_ifindex, 1121 reply, info->snd_portid, 1122 info->snd_seq, 0, 1123 OVS_FLOW_CMD_NEW, 1124 ufid_flags); 1125 BUG_ON(error < 0); 1126 } 1127 } else { 1128 /* Could not alloc without acts before locking. */ 1129 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1130 info, OVS_FLOW_CMD_NEW, false, 1131 ufid_flags); 1132 1133 if (unlikely(IS_ERR(reply))) { 1134 error = PTR_ERR(reply); 1135 goto err_unlock_ovs; 1136 } 1137 } 1138 1139 /* Clear stats. */ 1140 if (a[OVS_FLOW_ATTR_CLEAR]) 1141 ovs_flow_stats_clear(flow); 1142 ovs_unlock(); 1143 1144 if (reply) 1145 ovs_notify(&dp_flow_genl_family, reply, info); 1146 if (old_acts) 1147 ovs_nla_free_flow_actions(old_acts); 1148 1149 return 0; 1150 1151 err_unlock_ovs: 1152 ovs_unlock(); 1153 kfree_skb(reply); 1154 err_kfree_acts: 1155 kfree(acts); 1156 error: 1157 return error; 1158 } 1159 1160 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1161 { 1162 struct nlattr **a = info->attrs; 1163 struct ovs_header *ovs_header = info->userhdr; 1164 struct sw_flow_key key; 1165 struct sk_buff *reply; 1166 struct sw_flow *flow; 1167 struct datapath *dp; 1168 struct sw_flow_match match; 1169 struct sw_flow_id ufid; 1170 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1171 int err = 0; 1172 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1173 bool ufid_present; 1174 1175 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1176 if (a[OVS_FLOW_ATTR_KEY]) { 1177 ovs_match_init(&match, &key, NULL); 1178 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL, 1179 log); 1180 } else if (!ufid_present) { 1181 OVS_NLERR(log, 1182 "Flow get message rejected, Key attribute missing."); 1183 err = -EINVAL; 1184 } 1185 if (err) 1186 return err; 1187 1188 ovs_lock(); 1189 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1190 if (!dp) { 1191 err = -ENODEV; 1192 goto unlock; 1193 } 1194 1195 if (ufid_present) 1196 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1197 else 1198 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1199 if (!flow) { 1200 err = -ENOENT; 1201 goto unlock; 1202 } 1203 1204 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1205 OVS_FLOW_CMD_NEW, true, ufid_flags); 1206 if (IS_ERR(reply)) { 1207 err = PTR_ERR(reply); 1208 goto unlock; 1209 } 1210 1211 ovs_unlock(); 1212 return genlmsg_reply(reply, info); 1213 unlock: 1214 ovs_unlock(); 1215 return err; 1216 } 1217 1218 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1219 { 1220 struct nlattr **a = info->attrs; 1221 struct ovs_header *ovs_header = info->userhdr; 1222 struct sw_flow_key key; 1223 struct sk_buff *reply; 1224 struct sw_flow *flow = NULL; 1225 struct datapath *dp; 1226 struct sw_flow_match match; 1227 struct sw_flow_id ufid; 1228 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1229 int err; 1230 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1231 bool ufid_present; 1232 1233 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1234 if (a[OVS_FLOW_ATTR_KEY]) { 1235 ovs_match_init(&match, &key, NULL); 1236 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL, 1237 log); 1238 if (unlikely(err)) 1239 return err; 1240 } 1241 1242 ovs_lock(); 1243 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1244 if (unlikely(!dp)) { 1245 err = -ENODEV; 1246 goto unlock; 1247 } 1248 1249 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) { 1250 err = ovs_flow_tbl_flush(&dp->table); 1251 goto unlock; 1252 } 1253 1254 if (ufid_present) 1255 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1256 else 1257 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1258 if (unlikely(!flow)) { 1259 err = -ENOENT; 1260 goto unlock; 1261 } 1262 1263 ovs_flow_tbl_remove(&dp->table, flow); 1264 ovs_unlock(); 1265 1266 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1267 &flow->id, info, false, ufid_flags); 1268 if (likely(reply)) { 1269 if (likely(!IS_ERR(reply))) { 1270 rcu_read_lock(); /*To keep RCU checker happy. */ 1271 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1272 reply, info->snd_portid, 1273 info->snd_seq, 0, 1274 OVS_FLOW_CMD_DEL, 1275 ufid_flags); 1276 rcu_read_unlock(); 1277 BUG_ON(err < 0); 1278 1279 ovs_notify(&dp_flow_genl_family, reply, info); 1280 } else { 1281 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply)); 1282 } 1283 } 1284 1285 ovs_flow_free(flow, true); 1286 return 0; 1287 unlock: 1288 ovs_unlock(); 1289 return err; 1290 } 1291 1292 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1293 { 1294 struct nlattr *a[__OVS_FLOW_ATTR_MAX]; 1295 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1296 struct table_instance *ti; 1297 struct datapath *dp; 1298 u32 ufid_flags; 1299 int err; 1300 1301 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a, 1302 OVS_FLOW_ATTR_MAX, flow_policy); 1303 if (err) 1304 return err; 1305 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1306 1307 rcu_read_lock(); 1308 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1309 if (!dp) { 1310 rcu_read_unlock(); 1311 return -ENODEV; 1312 } 1313 1314 ti = rcu_dereference(dp->table.ti); 1315 for (;;) { 1316 struct sw_flow *flow; 1317 u32 bucket, obj; 1318 1319 bucket = cb->args[0]; 1320 obj = cb->args[1]; 1321 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1322 if (!flow) 1323 break; 1324 1325 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1326 NETLINK_CB(cb->skb).portid, 1327 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1328 OVS_FLOW_CMD_NEW, ufid_flags) < 0) 1329 break; 1330 1331 cb->args[0] = bucket; 1332 cb->args[1] = obj; 1333 } 1334 rcu_read_unlock(); 1335 return skb->len; 1336 } 1337 1338 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1339 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1340 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1341 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1342 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1343 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1344 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, 1345 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, 1346 }; 1347 1348 static const struct genl_ops dp_flow_genl_ops[] = { 1349 { .cmd = OVS_FLOW_CMD_NEW, 1350 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1351 .policy = flow_policy, 1352 .doit = ovs_flow_cmd_new 1353 }, 1354 { .cmd = OVS_FLOW_CMD_DEL, 1355 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1356 .policy = flow_policy, 1357 .doit = ovs_flow_cmd_del 1358 }, 1359 { .cmd = OVS_FLOW_CMD_GET, 1360 .flags = 0, /* OK for unprivileged users. */ 1361 .policy = flow_policy, 1362 .doit = ovs_flow_cmd_get, 1363 .dumpit = ovs_flow_cmd_dump 1364 }, 1365 { .cmd = OVS_FLOW_CMD_SET, 1366 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1367 .policy = flow_policy, 1368 .doit = ovs_flow_cmd_set, 1369 }, 1370 }; 1371 1372 static struct genl_family dp_flow_genl_family = { 1373 .id = GENL_ID_GENERATE, 1374 .hdrsize = sizeof(struct ovs_header), 1375 .name = OVS_FLOW_FAMILY, 1376 .version = OVS_FLOW_VERSION, 1377 .maxattr = OVS_FLOW_ATTR_MAX, 1378 .netnsok = true, 1379 .parallel_ops = true, 1380 .ops = dp_flow_genl_ops, 1381 .n_ops = ARRAY_SIZE(dp_flow_genl_ops), 1382 .mcgrps = &ovs_dp_flow_multicast_group, 1383 .n_mcgrps = 1, 1384 }; 1385 1386 static size_t ovs_dp_cmd_msg_size(void) 1387 { 1388 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1389 1390 msgsize += nla_total_size(IFNAMSIZ); 1391 msgsize += nla_total_size(sizeof(struct ovs_dp_stats)); 1392 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats)); 1393 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1394 1395 return msgsize; 1396 } 1397 1398 /* Called with ovs_mutex. */ 1399 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1400 u32 portid, u32 seq, u32 flags, u8 cmd) 1401 { 1402 struct ovs_header *ovs_header; 1403 struct ovs_dp_stats dp_stats; 1404 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1405 int err; 1406 1407 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1408 flags, cmd); 1409 if (!ovs_header) 1410 goto error; 1411 1412 ovs_header->dp_ifindex = get_dpifindex(dp); 1413 1414 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1415 if (err) 1416 goto nla_put_failure; 1417 1418 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1419 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1420 &dp_stats)) 1421 goto nla_put_failure; 1422 1423 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1424 sizeof(struct ovs_dp_megaflow_stats), 1425 &dp_megaflow_stats)) 1426 goto nla_put_failure; 1427 1428 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1429 goto nla_put_failure; 1430 1431 genlmsg_end(skb, ovs_header); 1432 return 0; 1433 1434 nla_put_failure: 1435 genlmsg_cancel(skb, ovs_header); 1436 error: 1437 return -EMSGSIZE; 1438 } 1439 1440 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info) 1441 { 1442 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL); 1443 } 1444 1445 /* Called with rcu_read_lock or ovs_mutex. */ 1446 static struct datapath *lookup_datapath(struct net *net, 1447 const struct ovs_header *ovs_header, 1448 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1449 { 1450 struct datapath *dp; 1451 1452 if (!a[OVS_DP_ATTR_NAME]) 1453 dp = get_dp(net, ovs_header->dp_ifindex); 1454 else { 1455 struct vport *vport; 1456 1457 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1458 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1459 } 1460 return dp ? dp : ERR_PTR(-ENODEV); 1461 } 1462 1463 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info) 1464 { 1465 struct datapath *dp; 1466 1467 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1468 if (IS_ERR(dp)) 1469 return; 1470 1471 WARN(dp->user_features, "Dropping previously announced user features\n"); 1472 dp->user_features = 0; 1473 } 1474 1475 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1476 { 1477 if (a[OVS_DP_ATTR_USER_FEATURES]) 1478 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1479 } 1480 1481 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1482 { 1483 struct nlattr **a = info->attrs; 1484 struct vport_parms parms; 1485 struct sk_buff *reply; 1486 struct datapath *dp; 1487 struct vport *vport; 1488 struct ovs_net *ovs_net; 1489 int err, i; 1490 1491 err = -EINVAL; 1492 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1493 goto err; 1494 1495 reply = ovs_dp_cmd_alloc_info(info); 1496 if (!reply) 1497 return -ENOMEM; 1498 1499 err = -ENOMEM; 1500 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1501 if (dp == NULL) 1502 goto err_free_reply; 1503 1504 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk))); 1505 1506 /* Allocate table. */ 1507 err = ovs_flow_tbl_init(&dp->table); 1508 if (err) 1509 goto err_free_dp; 1510 1511 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1512 if (!dp->stats_percpu) { 1513 err = -ENOMEM; 1514 goto err_destroy_table; 1515 } 1516 1517 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head), 1518 GFP_KERNEL); 1519 if (!dp->ports) { 1520 err = -ENOMEM; 1521 goto err_destroy_percpu; 1522 } 1523 1524 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1525 INIT_HLIST_HEAD(&dp->ports[i]); 1526 1527 /* Set up our datapath device. */ 1528 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1529 parms.type = OVS_VPORT_TYPE_INTERNAL; 1530 parms.options = NULL; 1531 parms.dp = dp; 1532 parms.port_no = OVSP_LOCAL; 1533 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1534 1535 ovs_dp_change(dp, a); 1536 1537 /* So far only local changes have been made, now need the lock. */ 1538 ovs_lock(); 1539 1540 vport = new_vport(&parms); 1541 if (IS_ERR(vport)) { 1542 err = PTR_ERR(vport); 1543 if (err == -EBUSY) 1544 err = -EEXIST; 1545 1546 if (err == -EEXIST) { 1547 /* An outdated user space instance that does not understand 1548 * the concept of user_features has attempted to create a new 1549 * datapath and is likely to reuse it. Drop all user features. 1550 */ 1551 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1552 ovs_dp_reset_user_features(skb, info); 1553 } 1554 1555 goto err_destroy_ports_array; 1556 } 1557 1558 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1559 info->snd_seq, 0, OVS_DP_CMD_NEW); 1560 BUG_ON(err < 0); 1561 1562 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1563 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1564 1565 ovs_unlock(); 1566 1567 ovs_notify(&dp_datapath_genl_family, reply, info); 1568 return 0; 1569 1570 err_destroy_ports_array: 1571 ovs_unlock(); 1572 kfree(dp->ports); 1573 err_destroy_percpu: 1574 free_percpu(dp->stats_percpu); 1575 err_destroy_table: 1576 ovs_flow_tbl_destroy(&dp->table); 1577 err_free_dp: 1578 release_net(ovs_dp_get_net(dp)); 1579 kfree(dp); 1580 err_free_reply: 1581 kfree_skb(reply); 1582 err: 1583 return err; 1584 } 1585 1586 /* Called with ovs_mutex. */ 1587 static void __dp_destroy(struct datapath *dp) 1588 { 1589 int i; 1590 1591 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1592 struct vport *vport; 1593 struct hlist_node *n; 1594 1595 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1596 if (vport->port_no != OVSP_LOCAL) 1597 ovs_dp_detach_port(vport); 1598 } 1599 1600 list_del_rcu(&dp->list_node); 1601 1602 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1603 * all ports in datapath are destroyed first before freeing datapath. 1604 */ 1605 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1606 1607 /* RCU destroy the flow table */ 1608 call_rcu(&dp->rcu, destroy_dp_rcu); 1609 } 1610 1611 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1612 { 1613 struct sk_buff *reply; 1614 struct datapath *dp; 1615 int err; 1616 1617 reply = ovs_dp_cmd_alloc_info(info); 1618 if (!reply) 1619 return -ENOMEM; 1620 1621 ovs_lock(); 1622 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1623 err = PTR_ERR(dp); 1624 if (IS_ERR(dp)) 1625 goto err_unlock_free; 1626 1627 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1628 info->snd_seq, 0, OVS_DP_CMD_DEL); 1629 BUG_ON(err < 0); 1630 1631 __dp_destroy(dp); 1632 ovs_unlock(); 1633 1634 ovs_notify(&dp_datapath_genl_family, reply, info); 1635 1636 return 0; 1637 1638 err_unlock_free: 1639 ovs_unlock(); 1640 kfree_skb(reply); 1641 return err; 1642 } 1643 1644 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1645 { 1646 struct sk_buff *reply; 1647 struct datapath *dp; 1648 int err; 1649 1650 reply = ovs_dp_cmd_alloc_info(info); 1651 if (!reply) 1652 return -ENOMEM; 1653 1654 ovs_lock(); 1655 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1656 err = PTR_ERR(dp); 1657 if (IS_ERR(dp)) 1658 goto err_unlock_free; 1659 1660 ovs_dp_change(dp, info->attrs); 1661 1662 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1663 info->snd_seq, 0, OVS_DP_CMD_NEW); 1664 BUG_ON(err < 0); 1665 1666 ovs_unlock(); 1667 ovs_notify(&dp_datapath_genl_family, reply, info); 1668 1669 return 0; 1670 1671 err_unlock_free: 1672 ovs_unlock(); 1673 kfree_skb(reply); 1674 return err; 1675 } 1676 1677 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1678 { 1679 struct sk_buff *reply; 1680 struct datapath *dp; 1681 int err; 1682 1683 reply = ovs_dp_cmd_alloc_info(info); 1684 if (!reply) 1685 return -ENOMEM; 1686 1687 ovs_lock(); 1688 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1689 if (IS_ERR(dp)) { 1690 err = PTR_ERR(dp); 1691 goto err_unlock_free; 1692 } 1693 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1694 info->snd_seq, 0, OVS_DP_CMD_NEW); 1695 BUG_ON(err < 0); 1696 ovs_unlock(); 1697 1698 return genlmsg_reply(reply, info); 1699 1700 err_unlock_free: 1701 ovs_unlock(); 1702 kfree_skb(reply); 1703 return err; 1704 } 1705 1706 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1707 { 1708 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1709 struct datapath *dp; 1710 int skip = cb->args[0]; 1711 int i = 0; 1712 1713 ovs_lock(); 1714 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1715 if (i >= skip && 1716 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1717 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1718 OVS_DP_CMD_NEW) < 0) 1719 break; 1720 i++; 1721 } 1722 ovs_unlock(); 1723 1724 cb->args[0] = i; 1725 1726 return skb->len; 1727 } 1728 1729 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1730 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1731 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1732 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1733 }; 1734 1735 static const struct genl_ops dp_datapath_genl_ops[] = { 1736 { .cmd = OVS_DP_CMD_NEW, 1737 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1738 .policy = datapath_policy, 1739 .doit = ovs_dp_cmd_new 1740 }, 1741 { .cmd = OVS_DP_CMD_DEL, 1742 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1743 .policy = datapath_policy, 1744 .doit = ovs_dp_cmd_del 1745 }, 1746 { .cmd = OVS_DP_CMD_GET, 1747 .flags = 0, /* OK for unprivileged users. */ 1748 .policy = datapath_policy, 1749 .doit = ovs_dp_cmd_get, 1750 .dumpit = ovs_dp_cmd_dump 1751 }, 1752 { .cmd = OVS_DP_CMD_SET, 1753 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1754 .policy = datapath_policy, 1755 .doit = ovs_dp_cmd_set, 1756 }, 1757 }; 1758 1759 static struct genl_family dp_datapath_genl_family = { 1760 .id = GENL_ID_GENERATE, 1761 .hdrsize = sizeof(struct ovs_header), 1762 .name = OVS_DATAPATH_FAMILY, 1763 .version = OVS_DATAPATH_VERSION, 1764 .maxattr = OVS_DP_ATTR_MAX, 1765 .netnsok = true, 1766 .parallel_ops = true, 1767 .ops = dp_datapath_genl_ops, 1768 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops), 1769 .mcgrps = &ovs_dp_datapath_multicast_group, 1770 .n_mcgrps = 1, 1771 }; 1772 1773 /* Called with ovs_mutex or RCU read lock. */ 1774 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1775 u32 portid, u32 seq, u32 flags, u8 cmd) 1776 { 1777 struct ovs_header *ovs_header; 1778 struct ovs_vport_stats vport_stats; 1779 int err; 1780 1781 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1782 flags, cmd); 1783 if (!ovs_header) 1784 return -EMSGSIZE; 1785 1786 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1787 1788 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1789 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1790 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 1791 vport->ops->get_name(vport))) 1792 goto nla_put_failure; 1793 1794 ovs_vport_get_stats(vport, &vport_stats); 1795 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), 1796 &vport_stats)) 1797 goto nla_put_failure; 1798 1799 if (ovs_vport_get_upcall_portids(vport, skb)) 1800 goto nla_put_failure; 1801 1802 err = ovs_vport_get_options(vport, skb); 1803 if (err == -EMSGSIZE) 1804 goto error; 1805 1806 genlmsg_end(skb, ovs_header); 1807 return 0; 1808 1809 nla_put_failure: 1810 err = -EMSGSIZE; 1811 error: 1812 genlmsg_cancel(skb, ovs_header); 1813 return err; 1814 } 1815 1816 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 1817 { 1818 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1819 } 1820 1821 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 1822 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid, 1823 u32 seq, u8 cmd) 1824 { 1825 struct sk_buff *skb; 1826 int retval; 1827 1828 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1829 if (!skb) 1830 return ERR_PTR(-ENOMEM); 1831 1832 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd); 1833 BUG_ON(retval < 0); 1834 1835 return skb; 1836 } 1837 1838 /* Called with ovs_mutex or RCU read lock. */ 1839 static struct vport *lookup_vport(struct net *net, 1840 const struct ovs_header *ovs_header, 1841 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1842 { 1843 struct datapath *dp; 1844 struct vport *vport; 1845 1846 if (a[OVS_VPORT_ATTR_NAME]) { 1847 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 1848 if (!vport) 1849 return ERR_PTR(-ENODEV); 1850 if (ovs_header->dp_ifindex && 1851 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 1852 return ERR_PTR(-ENODEV); 1853 return vport; 1854 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 1855 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1856 1857 if (port_no >= DP_MAX_PORTS) 1858 return ERR_PTR(-EFBIG); 1859 1860 dp = get_dp(net, ovs_header->dp_ifindex); 1861 if (!dp) 1862 return ERR_PTR(-ENODEV); 1863 1864 vport = ovs_vport_ovsl_rcu(dp, port_no); 1865 if (!vport) 1866 return ERR_PTR(-ENODEV); 1867 return vport; 1868 } else 1869 return ERR_PTR(-EINVAL); 1870 } 1871 1872 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 1873 { 1874 struct nlattr **a = info->attrs; 1875 struct ovs_header *ovs_header = info->userhdr; 1876 struct vport_parms parms; 1877 struct sk_buff *reply; 1878 struct vport *vport; 1879 struct datapath *dp; 1880 u32 port_no; 1881 int err; 1882 1883 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 1884 !a[OVS_VPORT_ATTR_UPCALL_PID]) 1885 return -EINVAL; 1886 1887 port_no = a[OVS_VPORT_ATTR_PORT_NO] 1888 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 1889 if (port_no >= DP_MAX_PORTS) 1890 return -EFBIG; 1891 1892 reply = ovs_vport_cmd_alloc_info(); 1893 if (!reply) 1894 return -ENOMEM; 1895 1896 ovs_lock(); 1897 restart: 1898 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1899 err = -ENODEV; 1900 if (!dp) 1901 goto exit_unlock_free; 1902 1903 if (port_no) { 1904 vport = ovs_vport_ovsl(dp, port_no); 1905 err = -EBUSY; 1906 if (vport) 1907 goto exit_unlock_free; 1908 } else { 1909 for (port_no = 1; ; port_no++) { 1910 if (port_no >= DP_MAX_PORTS) { 1911 err = -EFBIG; 1912 goto exit_unlock_free; 1913 } 1914 vport = ovs_vport_ovsl(dp, port_no); 1915 if (!vport) 1916 break; 1917 } 1918 } 1919 1920 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 1921 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 1922 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 1923 parms.dp = dp; 1924 parms.port_no = port_no; 1925 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 1926 1927 vport = new_vport(&parms); 1928 err = PTR_ERR(vport); 1929 if (IS_ERR(vport)) { 1930 if (err == -EAGAIN) 1931 goto restart; 1932 goto exit_unlock_free; 1933 } 1934 1935 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 1936 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 1937 BUG_ON(err < 0); 1938 ovs_unlock(); 1939 1940 ovs_notify(&dp_vport_genl_family, reply, info); 1941 return 0; 1942 1943 exit_unlock_free: 1944 ovs_unlock(); 1945 kfree_skb(reply); 1946 return err; 1947 } 1948 1949 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 1950 { 1951 struct nlattr **a = info->attrs; 1952 struct sk_buff *reply; 1953 struct vport *vport; 1954 int err; 1955 1956 reply = ovs_vport_cmd_alloc_info(); 1957 if (!reply) 1958 return -ENOMEM; 1959 1960 ovs_lock(); 1961 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1962 err = PTR_ERR(vport); 1963 if (IS_ERR(vport)) 1964 goto exit_unlock_free; 1965 1966 if (a[OVS_VPORT_ATTR_TYPE] && 1967 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 1968 err = -EINVAL; 1969 goto exit_unlock_free; 1970 } 1971 1972 if (a[OVS_VPORT_ATTR_OPTIONS]) { 1973 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 1974 if (err) 1975 goto exit_unlock_free; 1976 } 1977 1978 1979 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 1980 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 1981 1982 err = ovs_vport_set_upcall_portids(vport, ids); 1983 if (err) 1984 goto exit_unlock_free; 1985 } 1986 1987 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 1988 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 1989 BUG_ON(err < 0); 1990 1991 ovs_unlock(); 1992 ovs_notify(&dp_vport_genl_family, reply, info); 1993 return 0; 1994 1995 exit_unlock_free: 1996 ovs_unlock(); 1997 kfree_skb(reply); 1998 return err; 1999 } 2000 2001 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2002 { 2003 struct nlattr **a = info->attrs; 2004 struct sk_buff *reply; 2005 struct vport *vport; 2006 int err; 2007 2008 reply = ovs_vport_cmd_alloc_info(); 2009 if (!reply) 2010 return -ENOMEM; 2011 2012 ovs_lock(); 2013 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2014 err = PTR_ERR(vport); 2015 if (IS_ERR(vport)) 2016 goto exit_unlock_free; 2017 2018 if (vport->port_no == OVSP_LOCAL) { 2019 err = -EINVAL; 2020 goto exit_unlock_free; 2021 } 2022 2023 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 2024 info->snd_seq, 0, OVS_VPORT_CMD_DEL); 2025 BUG_ON(err < 0); 2026 ovs_dp_detach_port(vport); 2027 ovs_unlock(); 2028 2029 ovs_notify(&dp_vport_genl_family, reply, info); 2030 return 0; 2031 2032 exit_unlock_free: 2033 ovs_unlock(); 2034 kfree_skb(reply); 2035 return err; 2036 } 2037 2038 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2039 { 2040 struct nlattr **a = info->attrs; 2041 struct ovs_header *ovs_header = info->userhdr; 2042 struct sk_buff *reply; 2043 struct vport *vport; 2044 int err; 2045 2046 reply = ovs_vport_cmd_alloc_info(); 2047 if (!reply) 2048 return -ENOMEM; 2049 2050 rcu_read_lock(); 2051 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2052 err = PTR_ERR(vport); 2053 if (IS_ERR(vport)) 2054 goto exit_unlock_free; 2055 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 2056 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 2057 BUG_ON(err < 0); 2058 rcu_read_unlock(); 2059 2060 return genlmsg_reply(reply, info); 2061 2062 exit_unlock_free: 2063 rcu_read_unlock(); 2064 kfree_skb(reply); 2065 return err; 2066 } 2067 2068 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2069 { 2070 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2071 struct datapath *dp; 2072 int bucket = cb->args[0], skip = cb->args[1]; 2073 int i, j = 0; 2074 2075 rcu_read_lock(); 2076 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2077 if (!dp) { 2078 rcu_read_unlock(); 2079 return -ENODEV; 2080 } 2081 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2082 struct vport *vport; 2083 2084 j = 0; 2085 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2086 if (j >= skip && 2087 ovs_vport_cmd_fill_info(vport, skb, 2088 NETLINK_CB(cb->skb).portid, 2089 cb->nlh->nlmsg_seq, 2090 NLM_F_MULTI, 2091 OVS_VPORT_CMD_NEW) < 0) 2092 goto out; 2093 2094 j++; 2095 } 2096 skip = 0; 2097 } 2098 out: 2099 rcu_read_unlock(); 2100 2101 cb->args[0] = i; 2102 cb->args[1] = j; 2103 2104 return skb->len; 2105 } 2106 2107 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2108 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2109 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2110 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2111 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2112 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 2113 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2114 }; 2115 2116 static const struct genl_ops dp_vport_genl_ops[] = { 2117 { .cmd = OVS_VPORT_CMD_NEW, 2118 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2119 .policy = vport_policy, 2120 .doit = ovs_vport_cmd_new 2121 }, 2122 { .cmd = OVS_VPORT_CMD_DEL, 2123 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2124 .policy = vport_policy, 2125 .doit = ovs_vport_cmd_del 2126 }, 2127 { .cmd = OVS_VPORT_CMD_GET, 2128 .flags = 0, /* OK for unprivileged users. */ 2129 .policy = vport_policy, 2130 .doit = ovs_vport_cmd_get, 2131 .dumpit = ovs_vport_cmd_dump 2132 }, 2133 { .cmd = OVS_VPORT_CMD_SET, 2134 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2135 .policy = vport_policy, 2136 .doit = ovs_vport_cmd_set, 2137 }, 2138 }; 2139 2140 struct genl_family dp_vport_genl_family = { 2141 .id = GENL_ID_GENERATE, 2142 .hdrsize = sizeof(struct ovs_header), 2143 .name = OVS_VPORT_FAMILY, 2144 .version = OVS_VPORT_VERSION, 2145 .maxattr = OVS_VPORT_ATTR_MAX, 2146 .netnsok = true, 2147 .parallel_ops = true, 2148 .ops = dp_vport_genl_ops, 2149 .n_ops = ARRAY_SIZE(dp_vport_genl_ops), 2150 .mcgrps = &ovs_dp_vport_multicast_group, 2151 .n_mcgrps = 1, 2152 }; 2153 2154 static struct genl_family * const dp_genl_families[] = { 2155 &dp_datapath_genl_family, 2156 &dp_vport_genl_family, 2157 &dp_flow_genl_family, 2158 &dp_packet_genl_family, 2159 }; 2160 2161 static void dp_unregister_genl(int n_families) 2162 { 2163 int i; 2164 2165 for (i = 0; i < n_families; i++) 2166 genl_unregister_family(dp_genl_families[i]); 2167 } 2168 2169 static int dp_register_genl(void) 2170 { 2171 int err; 2172 int i; 2173 2174 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2175 2176 err = genl_register_family(dp_genl_families[i]); 2177 if (err) 2178 goto error; 2179 } 2180 2181 return 0; 2182 2183 error: 2184 dp_unregister_genl(i); 2185 return err; 2186 } 2187 2188 static int __net_init ovs_init_net(struct net *net) 2189 { 2190 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2191 2192 INIT_LIST_HEAD(&ovs_net->dps); 2193 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2194 return 0; 2195 } 2196 2197 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2198 struct list_head *head) 2199 { 2200 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2201 struct datapath *dp; 2202 2203 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2204 int i; 2205 2206 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2207 struct vport *vport; 2208 2209 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2210 struct netdev_vport *netdev_vport; 2211 2212 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2213 continue; 2214 2215 netdev_vport = netdev_vport_priv(vport); 2216 if (dev_net(netdev_vport->dev) == dnet) 2217 list_add(&vport->detach_list, head); 2218 } 2219 } 2220 } 2221 } 2222 2223 static void __net_exit ovs_exit_net(struct net *dnet) 2224 { 2225 struct datapath *dp, *dp_next; 2226 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2227 struct vport *vport, *vport_next; 2228 struct net *net; 2229 LIST_HEAD(head); 2230 2231 ovs_lock(); 2232 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2233 __dp_destroy(dp); 2234 2235 rtnl_lock(); 2236 for_each_net(net) 2237 list_vports_from_net(net, dnet, &head); 2238 rtnl_unlock(); 2239 2240 /* Detach all vports from given namespace. */ 2241 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2242 list_del(&vport->detach_list); 2243 ovs_dp_detach_port(vport); 2244 } 2245 2246 ovs_unlock(); 2247 2248 cancel_work_sync(&ovs_net->dp_notify_work); 2249 } 2250 2251 static struct pernet_operations ovs_net_ops = { 2252 .init = ovs_init_net, 2253 .exit = ovs_exit_net, 2254 .id = &ovs_net_id, 2255 .size = sizeof(struct ovs_net), 2256 }; 2257 2258 static int __init dp_init(void) 2259 { 2260 int err; 2261 2262 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); 2263 2264 pr_info("Open vSwitch switching datapath\n"); 2265 2266 err = action_fifos_init(); 2267 if (err) 2268 goto error; 2269 2270 err = ovs_internal_dev_rtnl_link_register(); 2271 if (err) 2272 goto error_action_fifos_exit; 2273 2274 err = ovs_flow_init(); 2275 if (err) 2276 goto error_unreg_rtnl_link; 2277 2278 err = ovs_vport_init(); 2279 if (err) 2280 goto error_flow_exit; 2281 2282 err = register_pernet_device(&ovs_net_ops); 2283 if (err) 2284 goto error_vport_exit; 2285 2286 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2287 if (err) 2288 goto error_netns_exit; 2289 2290 err = ovs_netdev_init(); 2291 if (err) 2292 goto error_unreg_notifier; 2293 2294 err = dp_register_genl(); 2295 if (err < 0) 2296 goto error_unreg_netdev; 2297 2298 return 0; 2299 2300 error_unreg_netdev: 2301 ovs_netdev_exit(); 2302 error_unreg_notifier: 2303 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2304 error_netns_exit: 2305 unregister_pernet_device(&ovs_net_ops); 2306 error_vport_exit: 2307 ovs_vport_exit(); 2308 error_flow_exit: 2309 ovs_flow_exit(); 2310 error_unreg_rtnl_link: 2311 ovs_internal_dev_rtnl_link_unregister(); 2312 error_action_fifos_exit: 2313 action_fifos_exit(); 2314 error: 2315 return err; 2316 } 2317 2318 static void dp_cleanup(void) 2319 { 2320 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2321 ovs_netdev_exit(); 2322 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2323 unregister_pernet_device(&ovs_net_ops); 2324 rcu_barrier(); 2325 ovs_vport_exit(); 2326 ovs_flow_exit(); 2327 ovs_internal_dev_rtnl_link_unregister(); 2328 action_fifos_exit(); 2329 } 2330 2331 module_init(dp_init); 2332 module_exit(dp_cleanup); 2333 2334 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2335 MODULE_LICENSE("GPL"); 2336