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 kfree(dp->ports); 207 kfree(dp); 208 } 209 210 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 211 u16 port_no) 212 { 213 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 214 } 215 216 /* Called with ovs_mutex or RCU read lock. */ 217 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 218 { 219 struct vport *vport; 220 struct hlist_head *head; 221 222 head = vport_hash_bucket(dp, port_no); 223 hlist_for_each_entry_rcu(vport, head, dp_hash_node) { 224 if (vport->port_no == port_no) 225 return vport; 226 } 227 return NULL; 228 } 229 230 /* Called with ovs_mutex. */ 231 static struct vport *new_vport(const struct vport_parms *parms) 232 { 233 struct vport *vport; 234 235 vport = ovs_vport_add(parms); 236 if (!IS_ERR(vport)) { 237 struct datapath *dp = parms->dp; 238 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 239 240 hlist_add_head_rcu(&vport->dp_hash_node, head); 241 } 242 return vport; 243 } 244 245 void ovs_dp_detach_port(struct vport *p) 246 { 247 ASSERT_OVSL(); 248 249 /* First drop references to device. */ 250 hlist_del_rcu(&p->dp_hash_node); 251 252 /* Then destroy it. */ 253 ovs_vport_del(p); 254 } 255 256 /* Must be called with rcu_read_lock. */ 257 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key) 258 { 259 const struct vport *p = OVS_CB(skb)->input_vport; 260 struct datapath *dp = p->dp; 261 struct sw_flow *flow; 262 struct sw_flow_actions *sf_acts; 263 struct dp_stats_percpu *stats; 264 u64 *stats_counter; 265 u32 n_mask_hit; 266 267 stats = this_cpu_ptr(dp->stats_percpu); 268 269 /* Look up flow. */ 270 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit); 271 if (unlikely(!flow)) { 272 struct dp_upcall_info upcall; 273 int error; 274 275 memset(&upcall, 0, sizeof(upcall)); 276 upcall.cmd = OVS_PACKET_CMD_MISS; 277 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 278 error = ovs_dp_upcall(dp, skb, key, &upcall); 279 if (unlikely(error)) 280 kfree_skb(skb); 281 else 282 consume_skb(skb); 283 stats_counter = &stats->n_missed; 284 goto out; 285 } 286 287 ovs_flow_stats_update(flow, key->tp.flags, skb); 288 sf_acts = rcu_dereference(flow->sf_acts); 289 ovs_execute_actions(dp, skb, sf_acts, key); 290 291 stats_counter = &stats->n_hit; 292 293 out: 294 /* Update datapath statistics. */ 295 u64_stats_update_begin(&stats->syncp); 296 (*stats_counter)++; 297 stats->n_mask_hit += n_mask_hit; 298 u64_stats_update_end(&stats->syncp); 299 } 300 301 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 302 const struct sw_flow_key *key, 303 const struct dp_upcall_info *upcall_info) 304 { 305 struct dp_stats_percpu *stats; 306 int err; 307 308 if (upcall_info->portid == 0) { 309 err = -ENOTCONN; 310 goto err; 311 } 312 313 if (!skb_is_gso(skb)) 314 err = queue_userspace_packet(dp, skb, key, upcall_info); 315 else 316 err = queue_gso_packets(dp, skb, key, upcall_info); 317 if (err) 318 goto err; 319 320 return 0; 321 322 err: 323 stats = this_cpu_ptr(dp->stats_percpu); 324 325 u64_stats_update_begin(&stats->syncp); 326 stats->n_lost++; 327 u64_stats_update_end(&stats->syncp); 328 329 return err; 330 } 331 332 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 333 const struct sw_flow_key *key, 334 const struct dp_upcall_info *upcall_info) 335 { 336 unsigned short gso_type = skb_shinfo(skb)->gso_type; 337 struct sw_flow_key later_key; 338 struct sk_buff *segs, *nskb; 339 struct ovs_skb_cb ovs_cb; 340 int err; 341 342 ovs_cb = *OVS_CB(skb); 343 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 344 *OVS_CB(skb) = ovs_cb; 345 if (IS_ERR(segs)) 346 return PTR_ERR(segs); 347 if (segs == NULL) 348 return -EINVAL; 349 350 if (gso_type & SKB_GSO_UDP) { 351 /* The initial flow key extracted by ovs_flow_key_extract() 352 * in this case is for a first fragment, so we need to 353 * properly mark later fragments. 354 */ 355 later_key = *key; 356 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 357 } 358 359 /* Queue all of the segments. */ 360 skb = segs; 361 do { 362 *OVS_CB(skb) = ovs_cb; 363 if (gso_type & SKB_GSO_UDP && skb != segs) 364 key = &later_key; 365 366 err = queue_userspace_packet(dp, skb, key, upcall_info); 367 if (err) 368 break; 369 370 } while ((skb = skb->next)); 371 372 /* Free all of the segments. */ 373 skb = segs; 374 do { 375 nskb = skb->next; 376 if (err) 377 kfree_skb(skb); 378 else 379 consume_skb(skb); 380 } while ((skb = nskb)); 381 return err; 382 } 383 384 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, 385 unsigned int hdrlen) 386 { 387 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 388 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 389 + nla_total_size(ovs_key_attr_size()); /* OVS_PACKET_ATTR_KEY */ 390 391 /* OVS_PACKET_ATTR_USERDATA */ 392 if (upcall_info->userdata) 393 size += NLA_ALIGN(upcall_info->userdata->nla_len); 394 395 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ 396 if (upcall_info->egress_tun_info) 397 size += nla_total_size(ovs_tun_key_attr_size()); 398 399 /* OVS_PACKET_ATTR_ACTIONS */ 400 if (upcall_info->actions_len) 401 size += nla_total_size(upcall_info->actions_len); 402 403 return size; 404 } 405 406 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 407 const struct sw_flow_key *key, 408 const struct dp_upcall_info *upcall_info) 409 { 410 struct ovs_header *upcall; 411 struct sk_buff *nskb = NULL; 412 struct sk_buff *user_skb = NULL; /* to be queued to userspace */ 413 struct nlattr *nla; 414 struct genl_info info = { 415 .dst_sk = ovs_dp_get_net(dp)->genl_sock, 416 .snd_portid = upcall_info->portid, 417 }; 418 size_t len; 419 unsigned int hlen; 420 int err, dp_ifindex; 421 422 dp_ifindex = get_dpifindex(dp); 423 if (!dp_ifindex) 424 return -ENODEV; 425 426 if (skb_vlan_tag_present(skb)) { 427 nskb = skb_clone(skb, GFP_ATOMIC); 428 if (!nskb) 429 return -ENOMEM; 430 431 nskb = __vlan_hwaccel_push_inside(nskb); 432 if (!nskb) 433 return -ENOMEM; 434 435 skb = nskb; 436 } 437 438 if (nla_attr_size(skb->len) > USHRT_MAX) { 439 err = -EFBIG; 440 goto out; 441 } 442 443 /* Complete checksum if needed */ 444 if (skb->ip_summed == CHECKSUM_PARTIAL && 445 (err = skb_checksum_help(skb))) 446 goto out; 447 448 /* Older versions of OVS user space enforce alignment of the last 449 * Netlink attribute to NLA_ALIGNTO which would require extensive 450 * padding logic. Only perform zerocopy if padding is not required. 451 */ 452 if (dp->user_features & OVS_DP_F_UNALIGNED) 453 hlen = skb_zerocopy_headlen(skb); 454 else 455 hlen = skb->len; 456 457 len = upcall_msg_size(upcall_info, hlen); 458 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC); 459 if (!user_skb) { 460 err = -ENOMEM; 461 goto out; 462 } 463 464 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 465 0, upcall_info->cmd); 466 upcall->dp_ifindex = dp_ifindex; 467 468 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); 469 BUG_ON(err); 470 471 if (upcall_info->userdata) 472 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 473 nla_len(upcall_info->userdata), 474 nla_data(upcall_info->userdata)); 475 476 if (upcall_info->egress_tun_info) { 477 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY); 478 err = ovs_nla_put_egress_tunnel_key(user_skb, 479 upcall_info->egress_tun_info); 480 BUG_ON(err); 481 nla_nest_end(user_skb, nla); 482 } 483 484 if (upcall_info->actions_len) { 485 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS); 486 err = ovs_nla_put_actions(upcall_info->actions, 487 upcall_info->actions_len, 488 user_skb); 489 if (!err) 490 nla_nest_end(user_skb, nla); 491 else 492 nla_nest_cancel(user_skb, nla); 493 } 494 495 /* Only reserve room for attribute header, packet data is added 496 * in skb_zerocopy() */ 497 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 498 err = -ENOBUFS; 499 goto out; 500 } 501 nla->nla_len = nla_attr_size(skb->len); 502 503 err = skb_zerocopy(user_skb, skb, skb->len, hlen); 504 if (err) 505 goto out; 506 507 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 508 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 509 size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len; 510 511 if (plen > 0) 512 memset(skb_put(user_skb, plen), 0, plen); 513 } 514 515 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 516 517 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 518 user_skb = NULL; 519 out: 520 if (err) 521 skb_tx_error(skb); 522 kfree_skb(user_skb); 523 kfree_skb(nskb); 524 return err; 525 } 526 527 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 528 { 529 struct ovs_header *ovs_header = info->userhdr; 530 struct nlattr **a = info->attrs; 531 struct sw_flow_actions *acts; 532 struct sk_buff *packet; 533 struct sw_flow *flow; 534 struct sw_flow_actions *sf_acts; 535 struct datapath *dp; 536 struct ethhdr *eth; 537 struct vport *input_vport; 538 int len; 539 int err; 540 bool log = !a[OVS_PACKET_ATTR_PROBE]; 541 542 err = -EINVAL; 543 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 544 !a[OVS_PACKET_ATTR_ACTIONS]) 545 goto err; 546 547 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 548 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 549 err = -ENOMEM; 550 if (!packet) 551 goto err; 552 skb_reserve(packet, NET_IP_ALIGN); 553 554 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 555 556 skb_reset_mac_header(packet); 557 eth = eth_hdr(packet); 558 559 /* Normally, setting the skb 'protocol' field would be handled by a 560 * call to eth_type_trans(), but it assumes there's a sending 561 * device, which we may not have. */ 562 if (eth_proto_is_802_3(eth->h_proto)) 563 packet->protocol = eth->h_proto; 564 else 565 packet->protocol = htons(ETH_P_802_2); 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(a[OVS_PACKET_ATTR_KEY], packet, 574 &flow->key, log); 575 if (err) 576 goto err_flow_free; 577 578 err = ovs_nla_copy_actions(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 OVS_CB(packet)->egress_tun_info = NULL; 585 packet->priority = flow->key.phy.priority; 586 packet->mark = flow->key.phy.skb_mark; 587 588 rcu_read_lock(); 589 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 590 err = -ENODEV; 591 if (!dp) 592 goto err_unlock; 593 594 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 595 if (!input_vport) 596 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 597 598 if (!input_vport) 599 goto err_unlock; 600 601 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 }; 628 629 static const struct genl_ops dp_packet_genl_ops[] = { 630 { .cmd = OVS_PACKET_CMD_EXECUTE, 631 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 632 .policy = packet_policy, 633 .doit = ovs_packet_cmd_execute 634 } 635 }; 636 637 static struct genl_family dp_packet_genl_family = { 638 .id = GENL_ID_GENERATE, 639 .hdrsize = sizeof(struct ovs_header), 640 .name = OVS_PACKET_FAMILY, 641 .version = OVS_PACKET_VERSION, 642 .maxattr = OVS_PACKET_ATTR_MAX, 643 .netnsok = true, 644 .parallel_ops = true, 645 .ops = dp_packet_genl_ops, 646 .n_ops = ARRAY_SIZE(dp_packet_genl_ops), 647 }; 648 649 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 650 struct ovs_dp_megaflow_stats *mega_stats) 651 { 652 int i; 653 654 memset(mega_stats, 0, sizeof(*mega_stats)); 655 656 stats->n_flows = ovs_flow_tbl_count(&dp->table); 657 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 658 659 stats->n_hit = stats->n_missed = stats->n_lost = 0; 660 661 for_each_possible_cpu(i) { 662 const struct dp_stats_percpu *percpu_stats; 663 struct dp_stats_percpu local_stats; 664 unsigned int start; 665 666 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 667 668 do { 669 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 670 local_stats = *percpu_stats; 671 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 672 673 stats->n_hit += local_stats.n_hit; 674 stats->n_missed += local_stats.n_missed; 675 stats->n_lost += local_stats.n_lost; 676 mega_stats->n_mask_hit += local_stats.n_mask_hit; 677 } 678 } 679 680 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) 681 { 682 return ovs_identifier_is_ufid(sfid) && 683 !(ufid_flags & OVS_UFID_F_OMIT_KEY); 684 } 685 686 static bool should_fill_mask(uint32_t ufid_flags) 687 { 688 return !(ufid_flags & OVS_UFID_F_OMIT_MASK); 689 } 690 691 static bool should_fill_actions(uint32_t ufid_flags) 692 { 693 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); 694 } 695 696 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, 697 const struct sw_flow_id *sfid, 698 uint32_t ufid_flags) 699 { 700 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); 701 702 /* OVS_FLOW_ATTR_UFID */ 703 if (sfid && ovs_identifier_is_ufid(sfid)) 704 len += nla_total_size(sfid->ufid_len); 705 706 /* OVS_FLOW_ATTR_KEY */ 707 if (!sfid || should_fill_key(sfid, ufid_flags)) 708 len += nla_total_size(ovs_key_attr_size()); 709 710 /* OVS_FLOW_ATTR_MASK */ 711 if (should_fill_mask(ufid_flags)) 712 len += nla_total_size(ovs_key_attr_size()); 713 714 /* OVS_FLOW_ATTR_ACTIONS */ 715 if (should_fill_actions(ufid_flags)) 716 len += nla_total_size(acts->actions_len); 717 718 return len 719 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 720 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 721 + nla_total_size(8); /* OVS_FLOW_ATTR_USED */ 722 } 723 724 /* Called with ovs_mutex or RCU read lock. */ 725 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 726 struct sk_buff *skb) 727 { 728 struct ovs_flow_stats stats; 729 __be16 tcp_flags; 730 unsigned long used; 731 732 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 733 734 if (used && 735 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used))) 736 return -EMSGSIZE; 737 738 if (stats.n_packets && 739 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats)) 740 return -EMSGSIZE; 741 742 if ((u8)ntohs(tcp_flags) && 743 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 744 return -EMSGSIZE; 745 746 return 0; 747 } 748 749 /* Called with ovs_mutex or RCU read lock. */ 750 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 751 struct sk_buff *skb, int skb_orig_len) 752 { 753 struct nlattr *start; 754 int err; 755 756 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 757 * this is the first flow to be dumped into 'skb'. This is unusual for 758 * Netlink but individual action lists can be longer than 759 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 760 * The userspace caller can always fetch the actions separately if it 761 * really wants them. (Most userspace callers in fact don't care.) 762 * 763 * This can only fail for dump operations because the skb is always 764 * properly sized for single flows. 765 */ 766 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS); 767 if (start) { 768 const struct sw_flow_actions *sf_acts; 769 770 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 771 err = ovs_nla_put_actions(sf_acts->actions, 772 sf_acts->actions_len, skb); 773 774 if (!err) 775 nla_nest_end(skb, start); 776 else { 777 if (skb_orig_len) 778 return err; 779 780 nla_nest_cancel(skb, start); 781 } 782 } else if (skb_orig_len) { 783 return -EMSGSIZE; 784 } 785 786 return 0; 787 } 788 789 /* Called with ovs_mutex or RCU read lock. */ 790 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 791 struct sk_buff *skb, u32 portid, 792 u32 seq, u32 flags, u8 cmd, u32 ufid_flags) 793 { 794 const int skb_orig_len = skb->len; 795 struct ovs_header *ovs_header; 796 int err; 797 798 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 799 flags, cmd); 800 if (!ovs_header) 801 return -EMSGSIZE; 802 803 ovs_header->dp_ifindex = dp_ifindex; 804 805 err = ovs_nla_put_identifier(flow, skb); 806 if (err) 807 goto error; 808 809 if (should_fill_key(&flow->id, ufid_flags)) { 810 err = ovs_nla_put_masked_key(flow, skb); 811 if (err) 812 goto error; 813 } 814 815 if (should_fill_mask(ufid_flags)) { 816 err = ovs_nla_put_mask(flow, skb); 817 if (err) 818 goto error; 819 } 820 821 err = ovs_flow_cmd_fill_stats(flow, skb); 822 if (err) 823 goto error; 824 825 if (should_fill_actions(ufid_flags)) { 826 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 827 if (err) 828 goto error; 829 } 830 831 genlmsg_end(skb, ovs_header); 832 return 0; 833 834 error: 835 genlmsg_cancel(skb, ovs_header); 836 return err; 837 } 838 839 /* May not be called with RCU read lock. */ 840 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 841 const struct sw_flow_id *sfid, 842 struct genl_info *info, 843 bool always, 844 uint32_t ufid_flags) 845 { 846 struct sk_buff *skb; 847 size_t len; 848 849 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 850 return NULL; 851 852 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); 853 skb = genlmsg_new_unicast(len, info, GFP_KERNEL); 854 if (!skb) 855 return ERR_PTR(-ENOMEM); 856 857 return skb; 858 } 859 860 /* Called with ovs_mutex. */ 861 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 862 int dp_ifindex, 863 struct genl_info *info, u8 cmd, 864 bool always, u32 ufid_flags) 865 { 866 struct sk_buff *skb; 867 int retval; 868 869 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), 870 &flow->id, info, always, ufid_flags); 871 if (IS_ERR_OR_NULL(skb)) 872 return skb; 873 874 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 875 info->snd_portid, info->snd_seq, 0, 876 cmd, ufid_flags); 877 BUG_ON(retval < 0); 878 return skb; 879 } 880 881 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 882 { 883 struct nlattr **a = info->attrs; 884 struct ovs_header *ovs_header = info->userhdr; 885 struct sw_flow *flow = NULL, *new_flow; 886 struct sw_flow_mask mask; 887 struct sk_buff *reply; 888 struct datapath *dp; 889 struct sw_flow_key key; 890 struct sw_flow_actions *acts; 891 struct sw_flow_match match; 892 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 893 int error; 894 bool log = !a[OVS_FLOW_ATTR_PROBE]; 895 896 /* Must have key and actions. */ 897 error = -EINVAL; 898 if (!a[OVS_FLOW_ATTR_KEY]) { 899 OVS_NLERR(log, "Flow key attr not present in new flow."); 900 goto error; 901 } 902 if (!a[OVS_FLOW_ATTR_ACTIONS]) { 903 OVS_NLERR(log, "Flow actions attr not present in new flow."); 904 goto error; 905 } 906 907 /* Most of the time we need to allocate a new flow, do it before 908 * locking. 909 */ 910 new_flow = ovs_flow_alloc(); 911 if (IS_ERR(new_flow)) { 912 error = PTR_ERR(new_flow); 913 goto error; 914 } 915 916 /* Extract key. */ 917 ovs_match_init(&match, &key, &mask); 918 error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], 919 a[OVS_FLOW_ATTR_MASK], log); 920 if (error) 921 goto err_kfree_flow; 922 923 ovs_flow_mask_key(&new_flow->key, &key, &mask); 924 925 /* Extract flow identifier. */ 926 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID], 927 &key, log); 928 if (error) 929 goto err_kfree_flow; 930 931 /* Validate actions. */ 932 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &new_flow->key, 933 &acts, log); 934 if (error) { 935 OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); 936 goto err_kfree_flow; 937 } 938 939 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false, 940 ufid_flags); 941 if (IS_ERR(reply)) { 942 error = PTR_ERR(reply); 943 goto err_kfree_acts; 944 } 945 946 ovs_lock(); 947 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 948 if (unlikely(!dp)) { 949 error = -ENODEV; 950 goto err_unlock_ovs; 951 } 952 953 /* Check if this is a duplicate flow */ 954 if (ovs_identifier_is_ufid(&new_flow->id)) 955 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id); 956 if (!flow) 957 flow = ovs_flow_tbl_lookup(&dp->table, &key); 958 if (likely(!flow)) { 959 rcu_assign_pointer(new_flow->sf_acts, acts); 960 961 /* Put flow in bucket. */ 962 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 963 if (unlikely(error)) { 964 acts = NULL; 965 goto err_unlock_ovs; 966 } 967 968 if (unlikely(reply)) { 969 error = ovs_flow_cmd_fill_info(new_flow, 970 ovs_header->dp_ifindex, 971 reply, info->snd_portid, 972 info->snd_seq, 0, 973 OVS_FLOW_CMD_NEW, 974 ufid_flags); 975 BUG_ON(error < 0); 976 } 977 ovs_unlock(); 978 } else { 979 struct sw_flow_actions *old_acts; 980 981 /* Bail out if we're not allowed to modify an existing flow. 982 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 983 * because Generic Netlink treats the latter as a dump 984 * request. We also accept NLM_F_EXCL in case that bug ever 985 * gets fixed. 986 */ 987 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 988 | NLM_F_EXCL))) { 989 error = -EEXIST; 990 goto err_unlock_ovs; 991 } 992 /* The flow identifier has to be the same for flow updates. 993 * Look for any overlapping flow. 994 */ 995 if (unlikely(!ovs_flow_cmp(flow, &match))) { 996 if (ovs_identifier_is_key(&flow->id)) 997 flow = ovs_flow_tbl_lookup_exact(&dp->table, 998 &match); 999 else /* UFID matches but key is different */ 1000 flow = NULL; 1001 if (!flow) { 1002 error = -ENOENT; 1003 goto err_unlock_ovs; 1004 } 1005 } 1006 /* Update actions. */ 1007 old_acts = ovsl_dereference(flow->sf_acts); 1008 rcu_assign_pointer(flow->sf_acts, acts); 1009 1010 if (unlikely(reply)) { 1011 error = ovs_flow_cmd_fill_info(flow, 1012 ovs_header->dp_ifindex, 1013 reply, info->snd_portid, 1014 info->snd_seq, 0, 1015 OVS_FLOW_CMD_NEW, 1016 ufid_flags); 1017 BUG_ON(error < 0); 1018 } 1019 ovs_unlock(); 1020 1021 ovs_nla_free_flow_actions(old_acts); 1022 ovs_flow_free(new_flow, false); 1023 } 1024 1025 if (reply) 1026 ovs_notify(&dp_flow_genl_family, reply, info); 1027 return 0; 1028 1029 err_unlock_ovs: 1030 ovs_unlock(); 1031 kfree_skb(reply); 1032 err_kfree_acts: 1033 kfree(acts); 1034 err_kfree_flow: 1035 ovs_flow_free(new_flow, false); 1036 error: 1037 return error; 1038 } 1039 1040 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ 1041 static struct sw_flow_actions *get_flow_actions(const struct nlattr *a, 1042 const struct sw_flow_key *key, 1043 const struct sw_flow_mask *mask, 1044 bool log) 1045 { 1046 struct sw_flow_actions *acts; 1047 struct sw_flow_key masked_key; 1048 int error; 1049 1050 ovs_flow_mask_key(&masked_key, key, mask); 1051 error = ovs_nla_copy_actions(a, &masked_key, &acts, log); 1052 if (error) { 1053 OVS_NLERR(log, 1054 "Actions may not be safe on all matching packets"); 1055 return ERR_PTR(error); 1056 } 1057 1058 return acts; 1059 } 1060 1061 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 1062 { 1063 struct nlattr **a = info->attrs; 1064 struct ovs_header *ovs_header = info->userhdr; 1065 struct sw_flow_key key; 1066 struct sw_flow *flow; 1067 struct sw_flow_mask mask; 1068 struct sk_buff *reply = NULL; 1069 struct datapath *dp; 1070 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 1071 struct sw_flow_match match; 1072 struct sw_flow_id sfid; 1073 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1074 int error; 1075 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1076 bool ufid_present; 1077 1078 /* Extract key. */ 1079 error = -EINVAL; 1080 if (!a[OVS_FLOW_ATTR_KEY]) { 1081 OVS_NLERR(log, "Flow key attribute not present in set flow."); 1082 goto error; 1083 } 1084 1085 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); 1086 ovs_match_init(&match, &key, &mask); 1087 error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], 1088 a[OVS_FLOW_ATTR_MASK], log); 1089 if (error) 1090 goto error; 1091 1092 /* Validate actions. */ 1093 if (a[OVS_FLOW_ATTR_ACTIONS]) { 1094 acts = get_flow_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, &mask, 1095 log); 1096 if (IS_ERR(acts)) { 1097 error = PTR_ERR(acts); 1098 goto error; 1099 } 1100 1101 /* Can allocate before locking if have acts. */ 1102 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false, 1103 ufid_flags); 1104 if (IS_ERR(reply)) { 1105 error = PTR_ERR(reply); 1106 goto err_kfree_acts; 1107 } 1108 } 1109 1110 ovs_lock(); 1111 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1112 if (unlikely(!dp)) { 1113 error = -ENODEV; 1114 goto err_unlock_ovs; 1115 } 1116 /* Check that the flow exists. */ 1117 if (ufid_present) 1118 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid); 1119 else 1120 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1121 if (unlikely(!flow)) { 1122 error = -ENOENT; 1123 goto err_unlock_ovs; 1124 } 1125 1126 /* Update actions, if present. */ 1127 if (likely(acts)) { 1128 old_acts = ovsl_dereference(flow->sf_acts); 1129 rcu_assign_pointer(flow->sf_acts, acts); 1130 1131 if (unlikely(reply)) { 1132 error = ovs_flow_cmd_fill_info(flow, 1133 ovs_header->dp_ifindex, 1134 reply, info->snd_portid, 1135 info->snd_seq, 0, 1136 OVS_FLOW_CMD_NEW, 1137 ufid_flags); 1138 BUG_ON(error < 0); 1139 } 1140 } else { 1141 /* Could not alloc without acts before locking. */ 1142 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1143 info, OVS_FLOW_CMD_NEW, false, 1144 ufid_flags); 1145 1146 if (unlikely(IS_ERR(reply))) { 1147 error = PTR_ERR(reply); 1148 goto err_unlock_ovs; 1149 } 1150 } 1151 1152 /* Clear stats. */ 1153 if (a[OVS_FLOW_ATTR_CLEAR]) 1154 ovs_flow_stats_clear(flow); 1155 ovs_unlock(); 1156 1157 if (reply) 1158 ovs_notify(&dp_flow_genl_family, reply, info); 1159 if (old_acts) 1160 ovs_nla_free_flow_actions(old_acts); 1161 1162 return 0; 1163 1164 err_unlock_ovs: 1165 ovs_unlock(); 1166 kfree_skb(reply); 1167 err_kfree_acts: 1168 kfree(acts); 1169 error: 1170 return error; 1171 } 1172 1173 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1174 { 1175 struct nlattr **a = info->attrs; 1176 struct ovs_header *ovs_header = info->userhdr; 1177 struct sw_flow_key key; 1178 struct sk_buff *reply; 1179 struct sw_flow *flow; 1180 struct datapath *dp; 1181 struct sw_flow_match match; 1182 struct sw_flow_id ufid; 1183 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1184 int err = 0; 1185 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1186 bool ufid_present; 1187 1188 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1189 if (a[OVS_FLOW_ATTR_KEY]) { 1190 ovs_match_init(&match, &key, NULL); 1191 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL, 1192 log); 1193 } else if (!ufid_present) { 1194 OVS_NLERR(log, 1195 "Flow get message rejected, Key attribute missing."); 1196 err = -EINVAL; 1197 } 1198 if (err) 1199 return err; 1200 1201 ovs_lock(); 1202 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1203 if (!dp) { 1204 err = -ENODEV; 1205 goto unlock; 1206 } 1207 1208 if (ufid_present) 1209 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1210 else 1211 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1212 if (!flow) { 1213 err = -ENOENT; 1214 goto unlock; 1215 } 1216 1217 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1218 OVS_FLOW_CMD_NEW, true, ufid_flags); 1219 if (IS_ERR(reply)) { 1220 err = PTR_ERR(reply); 1221 goto unlock; 1222 } 1223 1224 ovs_unlock(); 1225 return genlmsg_reply(reply, info); 1226 unlock: 1227 ovs_unlock(); 1228 return err; 1229 } 1230 1231 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1232 { 1233 struct nlattr **a = info->attrs; 1234 struct ovs_header *ovs_header = info->userhdr; 1235 struct sw_flow_key key; 1236 struct sk_buff *reply; 1237 struct sw_flow *flow = NULL; 1238 struct datapath *dp; 1239 struct sw_flow_match match; 1240 struct sw_flow_id ufid; 1241 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1242 int err; 1243 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1244 bool ufid_present; 1245 1246 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1247 if (a[OVS_FLOW_ATTR_KEY]) { 1248 ovs_match_init(&match, &key, NULL); 1249 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL, 1250 log); 1251 if (unlikely(err)) 1252 return err; 1253 } 1254 1255 ovs_lock(); 1256 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1257 if (unlikely(!dp)) { 1258 err = -ENODEV; 1259 goto unlock; 1260 } 1261 1262 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) { 1263 err = ovs_flow_tbl_flush(&dp->table); 1264 goto unlock; 1265 } 1266 1267 if (ufid_present) 1268 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1269 else 1270 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1271 if (unlikely(!flow)) { 1272 err = -ENOENT; 1273 goto unlock; 1274 } 1275 1276 ovs_flow_tbl_remove(&dp->table, flow); 1277 ovs_unlock(); 1278 1279 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1280 &flow->id, info, false, ufid_flags); 1281 if (likely(reply)) { 1282 if (likely(!IS_ERR(reply))) { 1283 rcu_read_lock(); /*To keep RCU checker happy. */ 1284 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1285 reply, info->snd_portid, 1286 info->snd_seq, 0, 1287 OVS_FLOW_CMD_DEL, 1288 ufid_flags); 1289 rcu_read_unlock(); 1290 BUG_ON(err < 0); 1291 1292 ovs_notify(&dp_flow_genl_family, reply, info); 1293 } else { 1294 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply)); 1295 } 1296 } 1297 1298 ovs_flow_free(flow, true); 1299 return 0; 1300 unlock: 1301 ovs_unlock(); 1302 return err; 1303 } 1304 1305 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1306 { 1307 struct nlattr *a[__OVS_FLOW_ATTR_MAX]; 1308 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1309 struct table_instance *ti; 1310 struct datapath *dp; 1311 u32 ufid_flags; 1312 int err; 1313 1314 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a, 1315 OVS_FLOW_ATTR_MAX, flow_policy); 1316 if (err) 1317 return err; 1318 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1319 1320 rcu_read_lock(); 1321 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1322 if (!dp) { 1323 rcu_read_unlock(); 1324 return -ENODEV; 1325 } 1326 1327 ti = rcu_dereference(dp->table.ti); 1328 for (;;) { 1329 struct sw_flow *flow; 1330 u32 bucket, obj; 1331 1332 bucket = cb->args[0]; 1333 obj = cb->args[1]; 1334 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1335 if (!flow) 1336 break; 1337 1338 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1339 NETLINK_CB(cb->skb).portid, 1340 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1341 OVS_FLOW_CMD_NEW, ufid_flags) < 0) 1342 break; 1343 1344 cb->args[0] = bucket; 1345 cb->args[1] = obj; 1346 } 1347 rcu_read_unlock(); 1348 return skb->len; 1349 } 1350 1351 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1352 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1353 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1354 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1355 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1356 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1357 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, 1358 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, 1359 }; 1360 1361 static const struct genl_ops dp_flow_genl_ops[] = { 1362 { .cmd = OVS_FLOW_CMD_NEW, 1363 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1364 .policy = flow_policy, 1365 .doit = ovs_flow_cmd_new 1366 }, 1367 { .cmd = OVS_FLOW_CMD_DEL, 1368 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1369 .policy = flow_policy, 1370 .doit = ovs_flow_cmd_del 1371 }, 1372 { .cmd = OVS_FLOW_CMD_GET, 1373 .flags = 0, /* OK for unprivileged users. */ 1374 .policy = flow_policy, 1375 .doit = ovs_flow_cmd_get, 1376 .dumpit = ovs_flow_cmd_dump 1377 }, 1378 { .cmd = OVS_FLOW_CMD_SET, 1379 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1380 .policy = flow_policy, 1381 .doit = ovs_flow_cmd_set, 1382 }, 1383 }; 1384 1385 static struct genl_family dp_flow_genl_family = { 1386 .id = GENL_ID_GENERATE, 1387 .hdrsize = sizeof(struct ovs_header), 1388 .name = OVS_FLOW_FAMILY, 1389 .version = OVS_FLOW_VERSION, 1390 .maxattr = OVS_FLOW_ATTR_MAX, 1391 .netnsok = true, 1392 .parallel_ops = true, 1393 .ops = dp_flow_genl_ops, 1394 .n_ops = ARRAY_SIZE(dp_flow_genl_ops), 1395 .mcgrps = &ovs_dp_flow_multicast_group, 1396 .n_mcgrps = 1, 1397 }; 1398 1399 static size_t ovs_dp_cmd_msg_size(void) 1400 { 1401 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1402 1403 msgsize += nla_total_size(IFNAMSIZ); 1404 msgsize += nla_total_size(sizeof(struct ovs_dp_stats)); 1405 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats)); 1406 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1407 1408 return msgsize; 1409 } 1410 1411 /* Called with ovs_mutex. */ 1412 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1413 u32 portid, u32 seq, u32 flags, u8 cmd) 1414 { 1415 struct ovs_header *ovs_header; 1416 struct ovs_dp_stats dp_stats; 1417 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1418 int err; 1419 1420 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1421 flags, cmd); 1422 if (!ovs_header) 1423 goto error; 1424 1425 ovs_header->dp_ifindex = get_dpifindex(dp); 1426 1427 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1428 if (err) 1429 goto nla_put_failure; 1430 1431 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1432 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1433 &dp_stats)) 1434 goto nla_put_failure; 1435 1436 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1437 sizeof(struct ovs_dp_megaflow_stats), 1438 &dp_megaflow_stats)) 1439 goto nla_put_failure; 1440 1441 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1442 goto nla_put_failure; 1443 1444 genlmsg_end(skb, ovs_header); 1445 return 0; 1446 1447 nla_put_failure: 1448 genlmsg_cancel(skb, ovs_header); 1449 error: 1450 return -EMSGSIZE; 1451 } 1452 1453 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info) 1454 { 1455 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL); 1456 } 1457 1458 /* Called with rcu_read_lock or ovs_mutex. */ 1459 static struct datapath *lookup_datapath(struct net *net, 1460 const struct ovs_header *ovs_header, 1461 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1462 { 1463 struct datapath *dp; 1464 1465 if (!a[OVS_DP_ATTR_NAME]) 1466 dp = get_dp(net, ovs_header->dp_ifindex); 1467 else { 1468 struct vport *vport; 1469 1470 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1471 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1472 } 1473 return dp ? dp : ERR_PTR(-ENODEV); 1474 } 1475 1476 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info) 1477 { 1478 struct datapath *dp; 1479 1480 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1481 if (IS_ERR(dp)) 1482 return; 1483 1484 WARN(dp->user_features, "Dropping previously announced user features\n"); 1485 dp->user_features = 0; 1486 } 1487 1488 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1489 { 1490 if (a[OVS_DP_ATTR_USER_FEATURES]) 1491 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1492 } 1493 1494 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1495 { 1496 struct nlattr **a = info->attrs; 1497 struct vport_parms parms; 1498 struct sk_buff *reply; 1499 struct datapath *dp; 1500 struct vport *vport; 1501 struct ovs_net *ovs_net; 1502 int err, i; 1503 1504 err = -EINVAL; 1505 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1506 goto err; 1507 1508 reply = ovs_dp_cmd_alloc_info(info); 1509 if (!reply) 1510 return -ENOMEM; 1511 1512 err = -ENOMEM; 1513 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1514 if (dp == NULL) 1515 goto err_free_reply; 1516 1517 ovs_dp_set_net(dp, sock_net(skb->sk)); 1518 1519 /* Allocate table. */ 1520 err = ovs_flow_tbl_init(&dp->table); 1521 if (err) 1522 goto err_free_dp; 1523 1524 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1525 if (!dp->stats_percpu) { 1526 err = -ENOMEM; 1527 goto err_destroy_table; 1528 } 1529 1530 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head), 1531 GFP_KERNEL); 1532 if (!dp->ports) { 1533 err = -ENOMEM; 1534 goto err_destroy_percpu; 1535 } 1536 1537 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1538 INIT_HLIST_HEAD(&dp->ports[i]); 1539 1540 /* Set up our datapath device. */ 1541 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1542 parms.type = OVS_VPORT_TYPE_INTERNAL; 1543 parms.options = NULL; 1544 parms.dp = dp; 1545 parms.port_no = OVSP_LOCAL; 1546 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1547 1548 ovs_dp_change(dp, a); 1549 1550 /* So far only local changes have been made, now need the lock. */ 1551 ovs_lock(); 1552 1553 vport = new_vport(&parms); 1554 if (IS_ERR(vport)) { 1555 err = PTR_ERR(vport); 1556 if (err == -EBUSY) 1557 err = -EEXIST; 1558 1559 if (err == -EEXIST) { 1560 /* An outdated user space instance that does not understand 1561 * the concept of user_features has attempted to create a new 1562 * datapath and is likely to reuse it. Drop all user features. 1563 */ 1564 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1565 ovs_dp_reset_user_features(skb, info); 1566 } 1567 1568 goto err_destroy_ports_array; 1569 } 1570 1571 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1572 info->snd_seq, 0, OVS_DP_CMD_NEW); 1573 BUG_ON(err < 0); 1574 1575 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1576 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1577 1578 ovs_unlock(); 1579 1580 ovs_notify(&dp_datapath_genl_family, reply, info); 1581 return 0; 1582 1583 err_destroy_ports_array: 1584 ovs_unlock(); 1585 kfree(dp->ports); 1586 err_destroy_percpu: 1587 free_percpu(dp->stats_percpu); 1588 err_destroy_table: 1589 ovs_flow_tbl_destroy(&dp->table); 1590 err_free_dp: 1591 kfree(dp); 1592 err_free_reply: 1593 kfree_skb(reply); 1594 err: 1595 return err; 1596 } 1597 1598 /* Called with ovs_mutex. */ 1599 static void __dp_destroy(struct datapath *dp) 1600 { 1601 int i; 1602 1603 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1604 struct vport *vport; 1605 struct hlist_node *n; 1606 1607 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1608 if (vport->port_no != OVSP_LOCAL) 1609 ovs_dp_detach_port(vport); 1610 } 1611 1612 list_del_rcu(&dp->list_node); 1613 1614 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1615 * all ports in datapath are destroyed first before freeing datapath. 1616 */ 1617 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1618 1619 /* RCU destroy the flow table */ 1620 call_rcu(&dp->rcu, destroy_dp_rcu); 1621 } 1622 1623 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1624 { 1625 struct sk_buff *reply; 1626 struct datapath *dp; 1627 int err; 1628 1629 reply = ovs_dp_cmd_alloc_info(info); 1630 if (!reply) 1631 return -ENOMEM; 1632 1633 ovs_lock(); 1634 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1635 err = PTR_ERR(dp); 1636 if (IS_ERR(dp)) 1637 goto err_unlock_free; 1638 1639 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1640 info->snd_seq, 0, OVS_DP_CMD_DEL); 1641 BUG_ON(err < 0); 1642 1643 __dp_destroy(dp); 1644 ovs_unlock(); 1645 1646 ovs_notify(&dp_datapath_genl_family, reply, info); 1647 1648 return 0; 1649 1650 err_unlock_free: 1651 ovs_unlock(); 1652 kfree_skb(reply); 1653 return err; 1654 } 1655 1656 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1657 { 1658 struct sk_buff *reply; 1659 struct datapath *dp; 1660 int err; 1661 1662 reply = ovs_dp_cmd_alloc_info(info); 1663 if (!reply) 1664 return -ENOMEM; 1665 1666 ovs_lock(); 1667 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1668 err = PTR_ERR(dp); 1669 if (IS_ERR(dp)) 1670 goto err_unlock_free; 1671 1672 ovs_dp_change(dp, info->attrs); 1673 1674 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1675 info->snd_seq, 0, OVS_DP_CMD_NEW); 1676 BUG_ON(err < 0); 1677 1678 ovs_unlock(); 1679 ovs_notify(&dp_datapath_genl_family, reply, info); 1680 1681 return 0; 1682 1683 err_unlock_free: 1684 ovs_unlock(); 1685 kfree_skb(reply); 1686 return err; 1687 } 1688 1689 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1690 { 1691 struct sk_buff *reply; 1692 struct datapath *dp; 1693 int err; 1694 1695 reply = ovs_dp_cmd_alloc_info(info); 1696 if (!reply) 1697 return -ENOMEM; 1698 1699 ovs_lock(); 1700 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1701 if (IS_ERR(dp)) { 1702 err = PTR_ERR(dp); 1703 goto err_unlock_free; 1704 } 1705 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1706 info->snd_seq, 0, OVS_DP_CMD_NEW); 1707 BUG_ON(err < 0); 1708 ovs_unlock(); 1709 1710 return genlmsg_reply(reply, info); 1711 1712 err_unlock_free: 1713 ovs_unlock(); 1714 kfree_skb(reply); 1715 return err; 1716 } 1717 1718 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1719 { 1720 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1721 struct datapath *dp; 1722 int skip = cb->args[0]; 1723 int i = 0; 1724 1725 ovs_lock(); 1726 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1727 if (i >= skip && 1728 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1729 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1730 OVS_DP_CMD_NEW) < 0) 1731 break; 1732 i++; 1733 } 1734 ovs_unlock(); 1735 1736 cb->args[0] = i; 1737 1738 return skb->len; 1739 } 1740 1741 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1742 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1743 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1744 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1745 }; 1746 1747 static const struct genl_ops dp_datapath_genl_ops[] = { 1748 { .cmd = OVS_DP_CMD_NEW, 1749 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1750 .policy = datapath_policy, 1751 .doit = ovs_dp_cmd_new 1752 }, 1753 { .cmd = OVS_DP_CMD_DEL, 1754 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1755 .policy = datapath_policy, 1756 .doit = ovs_dp_cmd_del 1757 }, 1758 { .cmd = OVS_DP_CMD_GET, 1759 .flags = 0, /* OK for unprivileged users. */ 1760 .policy = datapath_policy, 1761 .doit = ovs_dp_cmd_get, 1762 .dumpit = ovs_dp_cmd_dump 1763 }, 1764 { .cmd = OVS_DP_CMD_SET, 1765 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1766 .policy = datapath_policy, 1767 .doit = ovs_dp_cmd_set, 1768 }, 1769 }; 1770 1771 static struct genl_family dp_datapath_genl_family = { 1772 .id = GENL_ID_GENERATE, 1773 .hdrsize = sizeof(struct ovs_header), 1774 .name = OVS_DATAPATH_FAMILY, 1775 .version = OVS_DATAPATH_VERSION, 1776 .maxattr = OVS_DP_ATTR_MAX, 1777 .netnsok = true, 1778 .parallel_ops = true, 1779 .ops = dp_datapath_genl_ops, 1780 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops), 1781 .mcgrps = &ovs_dp_datapath_multicast_group, 1782 .n_mcgrps = 1, 1783 }; 1784 1785 /* Called with ovs_mutex or RCU read lock. */ 1786 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1787 u32 portid, u32 seq, u32 flags, u8 cmd) 1788 { 1789 struct ovs_header *ovs_header; 1790 struct ovs_vport_stats vport_stats; 1791 int err; 1792 1793 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1794 flags, cmd); 1795 if (!ovs_header) 1796 return -EMSGSIZE; 1797 1798 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1799 1800 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1801 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1802 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 1803 vport->ops->get_name(vport))) 1804 goto nla_put_failure; 1805 1806 ovs_vport_get_stats(vport, &vport_stats); 1807 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), 1808 &vport_stats)) 1809 goto nla_put_failure; 1810 1811 if (ovs_vport_get_upcall_portids(vport, skb)) 1812 goto nla_put_failure; 1813 1814 err = ovs_vport_get_options(vport, skb); 1815 if (err == -EMSGSIZE) 1816 goto error; 1817 1818 genlmsg_end(skb, ovs_header); 1819 return 0; 1820 1821 nla_put_failure: 1822 err = -EMSGSIZE; 1823 error: 1824 genlmsg_cancel(skb, ovs_header); 1825 return err; 1826 } 1827 1828 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 1829 { 1830 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1831 } 1832 1833 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 1834 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid, 1835 u32 seq, u8 cmd) 1836 { 1837 struct sk_buff *skb; 1838 int retval; 1839 1840 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1841 if (!skb) 1842 return ERR_PTR(-ENOMEM); 1843 1844 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd); 1845 BUG_ON(retval < 0); 1846 1847 return skb; 1848 } 1849 1850 /* Called with ovs_mutex or RCU read lock. */ 1851 static struct vport *lookup_vport(struct net *net, 1852 const struct ovs_header *ovs_header, 1853 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1854 { 1855 struct datapath *dp; 1856 struct vport *vport; 1857 1858 if (a[OVS_VPORT_ATTR_NAME]) { 1859 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 1860 if (!vport) 1861 return ERR_PTR(-ENODEV); 1862 if (ovs_header->dp_ifindex && 1863 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 1864 return ERR_PTR(-ENODEV); 1865 return vport; 1866 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 1867 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1868 1869 if (port_no >= DP_MAX_PORTS) 1870 return ERR_PTR(-EFBIG); 1871 1872 dp = get_dp(net, ovs_header->dp_ifindex); 1873 if (!dp) 1874 return ERR_PTR(-ENODEV); 1875 1876 vport = ovs_vport_ovsl_rcu(dp, port_no); 1877 if (!vport) 1878 return ERR_PTR(-ENODEV); 1879 return vport; 1880 } else 1881 return ERR_PTR(-EINVAL); 1882 } 1883 1884 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 1885 { 1886 struct nlattr **a = info->attrs; 1887 struct ovs_header *ovs_header = info->userhdr; 1888 struct vport_parms parms; 1889 struct sk_buff *reply; 1890 struct vport *vport; 1891 struct datapath *dp; 1892 u32 port_no; 1893 int err; 1894 1895 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 1896 !a[OVS_VPORT_ATTR_UPCALL_PID]) 1897 return -EINVAL; 1898 1899 port_no = a[OVS_VPORT_ATTR_PORT_NO] 1900 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 1901 if (port_no >= DP_MAX_PORTS) 1902 return -EFBIG; 1903 1904 reply = ovs_vport_cmd_alloc_info(); 1905 if (!reply) 1906 return -ENOMEM; 1907 1908 ovs_lock(); 1909 restart: 1910 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1911 err = -ENODEV; 1912 if (!dp) 1913 goto exit_unlock_free; 1914 1915 if (port_no) { 1916 vport = ovs_vport_ovsl(dp, port_no); 1917 err = -EBUSY; 1918 if (vport) 1919 goto exit_unlock_free; 1920 } else { 1921 for (port_no = 1; ; port_no++) { 1922 if (port_no >= DP_MAX_PORTS) { 1923 err = -EFBIG; 1924 goto exit_unlock_free; 1925 } 1926 vport = ovs_vport_ovsl(dp, port_no); 1927 if (!vport) 1928 break; 1929 } 1930 } 1931 1932 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 1933 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 1934 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 1935 parms.dp = dp; 1936 parms.port_no = port_no; 1937 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 1938 1939 vport = new_vport(&parms); 1940 err = PTR_ERR(vport); 1941 if (IS_ERR(vport)) { 1942 if (err == -EAGAIN) 1943 goto restart; 1944 goto exit_unlock_free; 1945 } 1946 1947 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 1948 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 1949 BUG_ON(err < 0); 1950 ovs_unlock(); 1951 1952 ovs_notify(&dp_vport_genl_family, reply, info); 1953 return 0; 1954 1955 exit_unlock_free: 1956 ovs_unlock(); 1957 kfree_skb(reply); 1958 return err; 1959 } 1960 1961 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 1962 { 1963 struct nlattr **a = info->attrs; 1964 struct sk_buff *reply; 1965 struct vport *vport; 1966 int err; 1967 1968 reply = ovs_vport_cmd_alloc_info(); 1969 if (!reply) 1970 return -ENOMEM; 1971 1972 ovs_lock(); 1973 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1974 err = PTR_ERR(vport); 1975 if (IS_ERR(vport)) 1976 goto exit_unlock_free; 1977 1978 if (a[OVS_VPORT_ATTR_TYPE] && 1979 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 1980 err = -EINVAL; 1981 goto exit_unlock_free; 1982 } 1983 1984 if (a[OVS_VPORT_ATTR_OPTIONS]) { 1985 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 1986 if (err) 1987 goto exit_unlock_free; 1988 } 1989 1990 1991 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 1992 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 1993 1994 err = ovs_vport_set_upcall_portids(vport, ids); 1995 if (err) 1996 goto exit_unlock_free; 1997 } 1998 1999 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 2000 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 2001 BUG_ON(err < 0); 2002 2003 ovs_unlock(); 2004 ovs_notify(&dp_vport_genl_family, reply, info); 2005 return 0; 2006 2007 exit_unlock_free: 2008 ovs_unlock(); 2009 kfree_skb(reply); 2010 return err; 2011 } 2012 2013 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2014 { 2015 struct nlattr **a = info->attrs; 2016 struct sk_buff *reply; 2017 struct vport *vport; 2018 int err; 2019 2020 reply = ovs_vport_cmd_alloc_info(); 2021 if (!reply) 2022 return -ENOMEM; 2023 2024 ovs_lock(); 2025 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2026 err = PTR_ERR(vport); 2027 if (IS_ERR(vport)) 2028 goto exit_unlock_free; 2029 2030 if (vport->port_no == OVSP_LOCAL) { 2031 err = -EINVAL; 2032 goto exit_unlock_free; 2033 } 2034 2035 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 2036 info->snd_seq, 0, OVS_VPORT_CMD_DEL); 2037 BUG_ON(err < 0); 2038 ovs_dp_detach_port(vport); 2039 ovs_unlock(); 2040 2041 ovs_notify(&dp_vport_genl_family, reply, info); 2042 return 0; 2043 2044 exit_unlock_free: 2045 ovs_unlock(); 2046 kfree_skb(reply); 2047 return err; 2048 } 2049 2050 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2051 { 2052 struct nlattr **a = info->attrs; 2053 struct ovs_header *ovs_header = info->userhdr; 2054 struct sk_buff *reply; 2055 struct vport *vport; 2056 int err; 2057 2058 reply = ovs_vport_cmd_alloc_info(); 2059 if (!reply) 2060 return -ENOMEM; 2061 2062 rcu_read_lock(); 2063 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2064 err = PTR_ERR(vport); 2065 if (IS_ERR(vport)) 2066 goto exit_unlock_free; 2067 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 2068 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 2069 BUG_ON(err < 0); 2070 rcu_read_unlock(); 2071 2072 return genlmsg_reply(reply, info); 2073 2074 exit_unlock_free: 2075 rcu_read_unlock(); 2076 kfree_skb(reply); 2077 return err; 2078 } 2079 2080 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2081 { 2082 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2083 struct datapath *dp; 2084 int bucket = cb->args[0], skip = cb->args[1]; 2085 int i, j = 0; 2086 2087 rcu_read_lock(); 2088 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2089 if (!dp) { 2090 rcu_read_unlock(); 2091 return -ENODEV; 2092 } 2093 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2094 struct vport *vport; 2095 2096 j = 0; 2097 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2098 if (j >= skip && 2099 ovs_vport_cmd_fill_info(vport, skb, 2100 NETLINK_CB(cb->skb).portid, 2101 cb->nlh->nlmsg_seq, 2102 NLM_F_MULTI, 2103 OVS_VPORT_CMD_NEW) < 0) 2104 goto out; 2105 2106 j++; 2107 } 2108 skip = 0; 2109 } 2110 out: 2111 rcu_read_unlock(); 2112 2113 cb->args[0] = i; 2114 cb->args[1] = j; 2115 2116 return skb->len; 2117 } 2118 2119 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2120 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2121 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2122 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2123 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2124 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 2125 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2126 }; 2127 2128 static const struct genl_ops dp_vport_genl_ops[] = { 2129 { .cmd = OVS_VPORT_CMD_NEW, 2130 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2131 .policy = vport_policy, 2132 .doit = ovs_vport_cmd_new 2133 }, 2134 { .cmd = OVS_VPORT_CMD_DEL, 2135 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2136 .policy = vport_policy, 2137 .doit = ovs_vport_cmd_del 2138 }, 2139 { .cmd = OVS_VPORT_CMD_GET, 2140 .flags = 0, /* OK for unprivileged users. */ 2141 .policy = vport_policy, 2142 .doit = ovs_vport_cmd_get, 2143 .dumpit = ovs_vport_cmd_dump 2144 }, 2145 { .cmd = OVS_VPORT_CMD_SET, 2146 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2147 .policy = vport_policy, 2148 .doit = ovs_vport_cmd_set, 2149 }, 2150 }; 2151 2152 struct genl_family dp_vport_genl_family = { 2153 .id = GENL_ID_GENERATE, 2154 .hdrsize = sizeof(struct ovs_header), 2155 .name = OVS_VPORT_FAMILY, 2156 .version = OVS_VPORT_VERSION, 2157 .maxattr = OVS_VPORT_ATTR_MAX, 2158 .netnsok = true, 2159 .parallel_ops = true, 2160 .ops = dp_vport_genl_ops, 2161 .n_ops = ARRAY_SIZE(dp_vport_genl_ops), 2162 .mcgrps = &ovs_dp_vport_multicast_group, 2163 .n_mcgrps = 1, 2164 }; 2165 2166 static struct genl_family * const dp_genl_families[] = { 2167 &dp_datapath_genl_family, 2168 &dp_vport_genl_family, 2169 &dp_flow_genl_family, 2170 &dp_packet_genl_family, 2171 }; 2172 2173 static void dp_unregister_genl(int n_families) 2174 { 2175 int i; 2176 2177 for (i = 0; i < n_families; i++) 2178 genl_unregister_family(dp_genl_families[i]); 2179 } 2180 2181 static int dp_register_genl(void) 2182 { 2183 int err; 2184 int i; 2185 2186 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2187 2188 err = genl_register_family(dp_genl_families[i]); 2189 if (err) 2190 goto error; 2191 } 2192 2193 return 0; 2194 2195 error: 2196 dp_unregister_genl(i); 2197 return err; 2198 } 2199 2200 static int __net_init ovs_init_net(struct net *net) 2201 { 2202 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2203 2204 INIT_LIST_HEAD(&ovs_net->dps); 2205 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2206 return 0; 2207 } 2208 2209 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2210 struct list_head *head) 2211 { 2212 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2213 struct datapath *dp; 2214 2215 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2216 int i; 2217 2218 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2219 struct vport *vport; 2220 2221 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2222 struct netdev_vport *netdev_vport; 2223 2224 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2225 continue; 2226 2227 netdev_vport = netdev_vport_priv(vport); 2228 if (dev_net(netdev_vport->dev) == dnet) 2229 list_add(&vport->detach_list, head); 2230 } 2231 } 2232 } 2233 } 2234 2235 static void __net_exit ovs_exit_net(struct net *dnet) 2236 { 2237 struct datapath *dp, *dp_next; 2238 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2239 struct vport *vport, *vport_next; 2240 struct net *net; 2241 LIST_HEAD(head); 2242 2243 ovs_lock(); 2244 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2245 __dp_destroy(dp); 2246 2247 rtnl_lock(); 2248 for_each_net(net) 2249 list_vports_from_net(net, dnet, &head); 2250 rtnl_unlock(); 2251 2252 /* Detach all vports from given namespace. */ 2253 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2254 list_del(&vport->detach_list); 2255 ovs_dp_detach_port(vport); 2256 } 2257 2258 ovs_unlock(); 2259 2260 cancel_work_sync(&ovs_net->dp_notify_work); 2261 } 2262 2263 static struct pernet_operations ovs_net_ops = { 2264 .init = ovs_init_net, 2265 .exit = ovs_exit_net, 2266 .id = &ovs_net_id, 2267 .size = sizeof(struct ovs_net), 2268 }; 2269 2270 static int __init dp_init(void) 2271 { 2272 int err; 2273 2274 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); 2275 2276 pr_info("Open vSwitch switching datapath\n"); 2277 2278 err = action_fifos_init(); 2279 if (err) 2280 goto error; 2281 2282 err = ovs_internal_dev_rtnl_link_register(); 2283 if (err) 2284 goto error_action_fifos_exit; 2285 2286 err = ovs_flow_init(); 2287 if (err) 2288 goto error_unreg_rtnl_link; 2289 2290 err = ovs_vport_init(); 2291 if (err) 2292 goto error_flow_exit; 2293 2294 err = register_pernet_device(&ovs_net_ops); 2295 if (err) 2296 goto error_vport_exit; 2297 2298 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2299 if (err) 2300 goto error_netns_exit; 2301 2302 err = ovs_netdev_init(); 2303 if (err) 2304 goto error_unreg_notifier; 2305 2306 err = dp_register_genl(); 2307 if (err < 0) 2308 goto error_unreg_netdev; 2309 2310 return 0; 2311 2312 error_unreg_netdev: 2313 ovs_netdev_exit(); 2314 error_unreg_notifier: 2315 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2316 error_netns_exit: 2317 unregister_pernet_device(&ovs_net_ops); 2318 error_vport_exit: 2319 ovs_vport_exit(); 2320 error_flow_exit: 2321 ovs_flow_exit(); 2322 error_unreg_rtnl_link: 2323 ovs_internal_dev_rtnl_link_unregister(); 2324 error_action_fifos_exit: 2325 action_fifos_exit(); 2326 error: 2327 return err; 2328 } 2329 2330 static void dp_cleanup(void) 2331 { 2332 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2333 ovs_netdev_exit(); 2334 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2335 unregister_pernet_device(&ovs_net_ops); 2336 rcu_barrier(); 2337 ovs_vport_exit(); 2338 ovs_flow_exit(); 2339 ovs_internal_dev_rtnl_link_unregister(); 2340 action_fifos_exit(); 2341 } 2342 2343 module_init(dp_init); 2344 module_exit(dp_cleanup); 2345 2346 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2347 MODULE_LICENSE("GPL"); 2348