1 /* 2 * Copyright (c) 2007-2012 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 <linux/workqueue.h> 51 #include <net/genetlink.h> 52 #include <net/net_namespace.h> 53 #include <net/netns/generic.h> 54 55 #include "datapath.h" 56 #include "flow.h" 57 #include "vport-internal_dev.h" 58 59 /** 60 * struct ovs_net - Per net-namespace data for ovs. 61 * @dps: List of datapaths to enable dumping them all out. 62 * Protected by genl_mutex. 63 */ 64 struct ovs_net { 65 struct list_head dps; 66 }; 67 68 static int ovs_net_id __read_mostly; 69 70 #define REHASH_FLOW_INTERVAL (10 * 60 * HZ) 71 static void rehash_flow_table(struct work_struct *work); 72 static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table); 73 74 /** 75 * DOC: Locking: 76 * 77 * Writes to device state (add/remove datapath, port, set operations on vports, 78 * etc.) are protected by RTNL. 79 * 80 * Writes to other state (flow table modifications, set miscellaneous datapath 81 * parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside 82 * genl_mutex. 83 * 84 * Reads are protected by RCU. 85 * 86 * There are a few special cases (mostly stats) that have their own 87 * synchronization but they nest under all of above and don't interact with 88 * each other. 89 */ 90 91 static struct vport *new_vport(const struct vport_parms *); 92 static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *, 93 const struct dp_upcall_info *); 94 static int queue_userspace_packet(struct net *, int dp_ifindex, 95 struct sk_buff *, 96 const struct dp_upcall_info *); 97 98 /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */ 99 static struct datapath *get_dp(struct net *net, int dp_ifindex) 100 { 101 struct datapath *dp = NULL; 102 struct net_device *dev; 103 104 rcu_read_lock(); 105 dev = dev_get_by_index_rcu(net, dp_ifindex); 106 if (dev) { 107 struct vport *vport = ovs_internal_dev_get_vport(dev); 108 if (vport) 109 dp = vport->dp; 110 } 111 rcu_read_unlock(); 112 113 return dp; 114 } 115 116 /* Must be called with rcu_read_lock or RTNL lock. */ 117 const char *ovs_dp_name(const struct datapath *dp) 118 { 119 struct vport *vport = ovs_vport_rtnl_rcu(dp, OVSP_LOCAL); 120 return vport->ops->get_name(vport); 121 } 122 123 static int get_dpifindex(struct datapath *dp) 124 { 125 struct vport *local; 126 int ifindex; 127 128 rcu_read_lock(); 129 130 local = ovs_vport_rcu(dp, OVSP_LOCAL); 131 if (local) 132 ifindex = local->ops->get_ifindex(local); 133 else 134 ifindex = 0; 135 136 rcu_read_unlock(); 137 138 return ifindex; 139 } 140 141 static void destroy_dp_rcu(struct rcu_head *rcu) 142 { 143 struct datapath *dp = container_of(rcu, struct datapath, rcu); 144 145 ovs_flow_tbl_destroy((__force struct flow_table *)dp->table); 146 free_percpu(dp->stats_percpu); 147 release_net(ovs_dp_get_net(dp)); 148 kfree(dp->ports); 149 kfree(dp); 150 } 151 152 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 153 u16 port_no) 154 { 155 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 156 } 157 158 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 159 { 160 struct vport *vport; 161 struct hlist_node *n; 162 struct hlist_head *head; 163 164 head = vport_hash_bucket(dp, port_no); 165 hlist_for_each_entry_rcu(vport, n, head, dp_hash_node) { 166 if (vport->port_no == port_no) 167 return vport; 168 } 169 return NULL; 170 } 171 172 /* Called with RTNL lock and genl_lock. */ 173 static struct vport *new_vport(const struct vport_parms *parms) 174 { 175 struct vport *vport; 176 177 vport = ovs_vport_add(parms); 178 if (!IS_ERR(vport)) { 179 struct datapath *dp = parms->dp; 180 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 181 182 hlist_add_head_rcu(&vport->dp_hash_node, head); 183 } 184 185 return vport; 186 } 187 188 /* Called with RTNL lock. */ 189 void ovs_dp_detach_port(struct vport *p) 190 { 191 ASSERT_RTNL(); 192 193 /* First drop references to device. */ 194 hlist_del_rcu(&p->dp_hash_node); 195 196 /* Then destroy it. */ 197 ovs_vport_del(p); 198 } 199 200 /* Must be called with rcu_read_lock. */ 201 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb) 202 { 203 struct datapath *dp = p->dp; 204 struct sw_flow *flow; 205 struct dp_stats_percpu *stats; 206 struct sw_flow_key key; 207 u64 *stats_counter; 208 int error; 209 int key_len; 210 211 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id()); 212 213 /* Extract flow from 'skb' into 'key'. */ 214 error = ovs_flow_extract(skb, p->port_no, &key, &key_len); 215 if (unlikely(error)) { 216 kfree_skb(skb); 217 return; 218 } 219 220 /* Look up flow. */ 221 flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len); 222 if (unlikely(!flow)) { 223 struct dp_upcall_info upcall; 224 225 upcall.cmd = OVS_PACKET_CMD_MISS; 226 upcall.key = &key; 227 upcall.userdata = NULL; 228 upcall.portid = p->upcall_portid; 229 ovs_dp_upcall(dp, skb, &upcall); 230 consume_skb(skb); 231 stats_counter = &stats->n_missed; 232 goto out; 233 } 234 235 OVS_CB(skb)->flow = flow; 236 237 stats_counter = &stats->n_hit; 238 ovs_flow_used(OVS_CB(skb)->flow, skb); 239 ovs_execute_actions(dp, skb); 240 241 out: 242 /* Update datapath statistics. */ 243 u64_stats_update_begin(&stats->sync); 244 (*stats_counter)++; 245 u64_stats_update_end(&stats->sync); 246 } 247 248 static struct genl_family dp_packet_genl_family = { 249 .id = GENL_ID_GENERATE, 250 .hdrsize = sizeof(struct ovs_header), 251 .name = OVS_PACKET_FAMILY, 252 .version = OVS_PACKET_VERSION, 253 .maxattr = OVS_PACKET_ATTR_MAX, 254 .netnsok = true 255 }; 256 257 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 258 const struct dp_upcall_info *upcall_info) 259 { 260 struct dp_stats_percpu *stats; 261 int dp_ifindex; 262 int err; 263 264 if (upcall_info->portid == 0) { 265 err = -ENOTCONN; 266 goto err; 267 } 268 269 dp_ifindex = get_dpifindex(dp); 270 if (!dp_ifindex) { 271 err = -ENODEV; 272 goto err; 273 } 274 275 if (!skb_is_gso(skb)) 276 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info); 277 else 278 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info); 279 if (err) 280 goto err; 281 282 return 0; 283 284 err: 285 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id()); 286 287 u64_stats_update_begin(&stats->sync); 288 stats->n_lost++; 289 u64_stats_update_end(&stats->sync); 290 291 return err; 292 } 293 294 static int queue_gso_packets(struct net *net, int dp_ifindex, 295 struct sk_buff *skb, 296 const struct dp_upcall_info *upcall_info) 297 { 298 unsigned short gso_type = skb_shinfo(skb)->gso_type; 299 struct dp_upcall_info later_info; 300 struct sw_flow_key later_key; 301 struct sk_buff *segs, *nskb; 302 int err; 303 304 segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM); 305 if (IS_ERR(segs)) 306 return PTR_ERR(segs); 307 308 /* Queue all of the segments. */ 309 skb = segs; 310 do { 311 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info); 312 if (err) 313 break; 314 315 if (skb == segs && gso_type & SKB_GSO_UDP) { 316 /* The initial flow key extracted by ovs_flow_extract() 317 * in this case is for a first fragment, so we need to 318 * properly mark later fragments. 319 */ 320 later_key = *upcall_info->key; 321 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 322 323 later_info = *upcall_info; 324 later_info.key = &later_key; 325 upcall_info = &later_info; 326 } 327 } while ((skb = skb->next)); 328 329 /* Free all of the segments. */ 330 skb = segs; 331 do { 332 nskb = skb->next; 333 if (err) 334 kfree_skb(skb); 335 else 336 consume_skb(skb); 337 } while ((skb = nskb)); 338 return err; 339 } 340 341 static int queue_userspace_packet(struct net *net, int dp_ifindex, 342 struct sk_buff *skb, 343 const struct dp_upcall_info *upcall_info) 344 { 345 struct ovs_header *upcall; 346 struct sk_buff *nskb = NULL; 347 struct sk_buff *user_skb; /* to be queued to userspace */ 348 struct nlattr *nla; 349 unsigned int len; 350 int err; 351 352 if (vlan_tx_tag_present(skb)) { 353 nskb = skb_clone(skb, GFP_ATOMIC); 354 if (!nskb) 355 return -ENOMEM; 356 357 nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb)); 358 if (!nskb) 359 return -ENOMEM; 360 361 nskb->vlan_tci = 0; 362 skb = nskb; 363 } 364 365 if (nla_attr_size(skb->len) > USHRT_MAX) { 366 err = -EFBIG; 367 goto out; 368 } 369 370 len = sizeof(struct ovs_header); 371 len += nla_total_size(skb->len); 372 len += nla_total_size(FLOW_BUFSIZE); 373 if (upcall_info->cmd == OVS_PACKET_CMD_ACTION) 374 len += nla_total_size(8); 375 376 user_skb = genlmsg_new(len, GFP_ATOMIC); 377 if (!user_skb) { 378 err = -ENOMEM; 379 goto out; 380 } 381 382 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 383 0, upcall_info->cmd); 384 upcall->dp_ifindex = dp_ifindex; 385 386 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY); 387 ovs_flow_to_nlattrs(upcall_info->key, user_skb); 388 nla_nest_end(user_skb, nla); 389 390 if (upcall_info->userdata) 391 nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA, 392 nla_get_u64(upcall_info->userdata)); 393 394 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len); 395 396 skb_copy_and_csum_dev(skb, nla_data(nla)); 397 398 err = genlmsg_unicast(net, user_skb, upcall_info->portid); 399 400 out: 401 kfree_skb(nskb); 402 return err; 403 } 404 405 /* Called with genl_mutex. */ 406 static int flush_flows(struct datapath *dp) 407 { 408 struct flow_table *old_table; 409 struct flow_table *new_table; 410 411 old_table = genl_dereference(dp->table); 412 new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS); 413 if (!new_table) 414 return -ENOMEM; 415 416 rcu_assign_pointer(dp->table, new_table); 417 418 ovs_flow_tbl_deferred_destroy(old_table); 419 return 0; 420 } 421 422 static int validate_actions(const struct nlattr *attr, 423 const struct sw_flow_key *key, int depth); 424 425 static int validate_sample(const struct nlattr *attr, 426 const struct sw_flow_key *key, int depth) 427 { 428 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1]; 429 const struct nlattr *probability, *actions; 430 const struct nlattr *a; 431 int rem; 432 433 memset(attrs, 0, sizeof(attrs)); 434 nla_for_each_nested(a, attr, rem) { 435 int type = nla_type(a); 436 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type]) 437 return -EINVAL; 438 attrs[type] = a; 439 } 440 if (rem) 441 return -EINVAL; 442 443 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY]; 444 if (!probability || nla_len(probability) != sizeof(u32)) 445 return -EINVAL; 446 447 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS]; 448 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN)) 449 return -EINVAL; 450 return validate_actions(actions, key, depth + 1); 451 } 452 453 static int validate_tp_port(const struct sw_flow_key *flow_key) 454 { 455 if (flow_key->eth.type == htons(ETH_P_IP)) { 456 if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst) 457 return 0; 458 } else if (flow_key->eth.type == htons(ETH_P_IPV6)) { 459 if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst) 460 return 0; 461 } 462 463 return -EINVAL; 464 } 465 466 static int validate_set(const struct nlattr *a, 467 const struct sw_flow_key *flow_key) 468 { 469 const struct nlattr *ovs_key = nla_data(a); 470 int key_type = nla_type(ovs_key); 471 472 /* There can be only one key in a action */ 473 if (nla_total_size(nla_len(ovs_key)) != nla_len(a)) 474 return -EINVAL; 475 476 if (key_type > OVS_KEY_ATTR_MAX || 477 nla_len(ovs_key) != ovs_key_lens[key_type]) 478 return -EINVAL; 479 480 switch (key_type) { 481 const struct ovs_key_ipv4 *ipv4_key; 482 483 case OVS_KEY_ATTR_PRIORITY: 484 case OVS_KEY_ATTR_ETHERNET: 485 break; 486 487 case OVS_KEY_ATTR_IPV4: 488 if (flow_key->eth.type != htons(ETH_P_IP)) 489 return -EINVAL; 490 491 if (!flow_key->ip.proto) 492 return -EINVAL; 493 494 ipv4_key = nla_data(ovs_key); 495 if (ipv4_key->ipv4_proto != flow_key->ip.proto) 496 return -EINVAL; 497 498 if (ipv4_key->ipv4_frag != flow_key->ip.frag) 499 return -EINVAL; 500 501 break; 502 503 case OVS_KEY_ATTR_TCP: 504 if (flow_key->ip.proto != IPPROTO_TCP) 505 return -EINVAL; 506 507 return validate_tp_port(flow_key); 508 509 case OVS_KEY_ATTR_UDP: 510 if (flow_key->ip.proto != IPPROTO_UDP) 511 return -EINVAL; 512 513 return validate_tp_port(flow_key); 514 515 default: 516 return -EINVAL; 517 } 518 519 return 0; 520 } 521 522 static int validate_userspace(const struct nlattr *attr) 523 { 524 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = { 525 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 }, 526 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 }, 527 }; 528 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1]; 529 int error; 530 531 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX, 532 attr, userspace_policy); 533 if (error) 534 return error; 535 536 if (!a[OVS_USERSPACE_ATTR_PID] || 537 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID])) 538 return -EINVAL; 539 540 return 0; 541 } 542 543 static int validate_actions(const struct nlattr *attr, 544 const struct sw_flow_key *key, int depth) 545 { 546 const struct nlattr *a; 547 int rem, err; 548 549 if (depth >= SAMPLE_ACTION_DEPTH) 550 return -EOVERFLOW; 551 552 nla_for_each_nested(a, attr, rem) { 553 /* Expected argument lengths, (u32)-1 for variable length. */ 554 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = { 555 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32), 556 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1, 557 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan), 558 [OVS_ACTION_ATTR_POP_VLAN] = 0, 559 [OVS_ACTION_ATTR_SET] = (u32)-1, 560 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1 561 }; 562 const struct ovs_action_push_vlan *vlan; 563 int type = nla_type(a); 564 565 if (type > OVS_ACTION_ATTR_MAX || 566 (action_lens[type] != nla_len(a) && 567 action_lens[type] != (u32)-1)) 568 return -EINVAL; 569 570 switch (type) { 571 case OVS_ACTION_ATTR_UNSPEC: 572 return -EINVAL; 573 574 case OVS_ACTION_ATTR_USERSPACE: 575 err = validate_userspace(a); 576 if (err) 577 return err; 578 break; 579 580 case OVS_ACTION_ATTR_OUTPUT: 581 if (nla_get_u32(a) >= DP_MAX_PORTS) 582 return -EINVAL; 583 break; 584 585 586 case OVS_ACTION_ATTR_POP_VLAN: 587 break; 588 589 case OVS_ACTION_ATTR_PUSH_VLAN: 590 vlan = nla_data(a); 591 if (vlan->vlan_tpid != htons(ETH_P_8021Q)) 592 return -EINVAL; 593 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT))) 594 return -EINVAL; 595 break; 596 597 case OVS_ACTION_ATTR_SET: 598 err = validate_set(a, key); 599 if (err) 600 return err; 601 break; 602 603 case OVS_ACTION_ATTR_SAMPLE: 604 err = validate_sample(a, key, depth); 605 if (err) 606 return err; 607 break; 608 609 default: 610 return -EINVAL; 611 } 612 } 613 614 if (rem > 0) 615 return -EINVAL; 616 617 return 0; 618 } 619 620 static void clear_stats(struct sw_flow *flow) 621 { 622 flow->used = 0; 623 flow->tcp_flags = 0; 624 flow->packet_count = 0; 625 flow->byte_count = 0; 626 } 627 628 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 629 { 630 struct ovs_header *ovs_header = info->userhdr; 631 struct nlattr **a = info->attrs; 632 struct sw_flow_actions *acts; 633 struct sk_buff *packet; 634 struct sw_flow *flow; 635 struct datapath *dp; 636 struct ethhdr *eth; 637 int len; 638 int err; 639 int key_len; 640 641 err = -EINVAL; 642 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 643 !a[OVS_PACKET_ATTR_ACTIONS] || 644 nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN) 645 goto err; 646 647 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 648 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 649 err = -ENOMEM; 650 if (!packet) 651 goto err; 652 skb_reserve(packet, NET_IP_ALIGN); 653 654 memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len); 655 656 skb_reset_mac_header(packet); 657 eth = eth_hdr(packet); 658 659 /* Normally, setting the skb 'protocol' field would be handled by a 660 * call to eth_type_trans(), but it assumes there's a sending 661 * device, which we may not have. */ 662 if (ntohs(eth->h_proto) >= 1536) 663 packet->protocol = eth->h_proto; 664 else 665 packet->protocol = htons(ETH_P_802_2); 666 667 /* Build an sw_flow for sending this packet. */ 668 flow = ovs_flow_alloc(); 669 err = PTR_ERR(flow); 670 if (IS_ERR(flow)) 671 goto err_kfree_skb; 672 673 err = ovs_flow_extract(packet, -1, &flow->key, &key_len); 674 if (err) 675 goto err_flow_free; 676 677 err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority, 678 &flow->key.phy.in_port, 679 a[OVS_PACKET_ATTR_KEY]); 680 if (err) 681 goto err_flow_free; 682 683 err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0); 684 if (err) 685 goto err_flow_free; 686 687 flow->hash = ovs_flow_hash(&flow->key, key_len); 688 689 acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]); 690 err = PTR_ERR(acts); 691 if (IS_ERR(acts)) 692 goto err_flow_free; 693 rcu_assign_pointer(flow->sf_acts, acts); 694 695 OVS_CB(packet)->flow = flow; 696 packet->priority = flow->key.phy.priority; 697 698 rcu_read_lock(); 699 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 700 err = -ENODEV; 701 if (!dp) 702 goto err_unlock; 703 704 local_bh_disable(); 705 err = ovs_execute_actions(dp, packet); 706 local_bh_enable(); 707 rcu_read_unlock(); 708 709 ovs_flow_free(flow); 710 return err; 711 712 err_unlock: 713 rcu_read_unlock(); 714 err_flow_free: 715 ovs_flow_free(flow); 716 err_kfree_skb: 717 kfree_skb(packet); 718 err: 719 return err; 720 } 721 722 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 723 [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC }, 724 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 725 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 726 }; 727 728 static struct genl_ops dp_packet_genl_ops[] = { 729 { .cmd = OVS_PACKET_CMD_EXECUTE, 730 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 731 .policy = packet_policy, 732 .doit = ovs_packet_cmd_execute 733 } 734 }; 735 736 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats) 737 { 738 int i; 739 struct flow_table *table = genl_dereference(dp->table); 740 741 stats->n_flows = ovs_flow_tbl_count(table); 742 743 stats->n_hit = stats->n_missed = stats->n_lost = 0; 744 for_each_possible_cpu(i) { 745 const struct dp_stats_percpu *percpu_stats; 746 struct dp_stats_percpu local_stats; 747 unsigned int start; 748 749 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 750 751 do { 752 start = u64_stats_fetch_begin_bh(&percpu_stats->sync); 753 local_stats = *percpu_stats; 754 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start)); 755 756 stats->n_hit += local_stats.n_hit; 757 stats->n_missed += local_stats.n_missed; 758 stats->n_lost += local_stats.n_lost; 759 } 760 } 761 762 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 763 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 764 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 765 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 766 }; 767 768 static struct genl_family dp_flow_genl_family = { 769 .id = GENL_ID_GENERATE, 770 .hdrsize = sizeof(struct ovs_header), 771 .name = OVS_FLOW_FAMILY, 772 .version = OVS_FLOW_VERSION, 773 .maxattr = OVS_FLOW_ATTR_MAX, 774 .netnsok = true 775 }; 776 777 static struct genl_multicast_group ovs_dp_flow_multicast_group = { 778 .name = OVS_FLOW_MCGROUP 779 }; 780 781 /* Called with genl_lock. */ 782 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp, 783 struct sk_buff *skb, u32 portid, 784 u32 seq, u32 flags, u8 cmd) 785 { 786 const int skb_orig_len = skb->len; 787 const struct sw_flow_actions *sf_acts; 788 struct ovs_flow_stats stats; 789 struct ovs_header *ovs_header; 790 struct nlattr *nla; 791 unsigned long used; 792 u8 tcp_flags; 793 int err; 794 795 sf_acts = rcu_dereference_protected(flow->sf_acts, 796 lockdep_genl_is_held()); 797 798 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd); 799 if (!ovs_header) 800 return -EMSGSIZE; 801 802 ovs_header->dp_ifindex = get_dpifindex(dp); 803 804 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY); 805 if (!nla) 806 goto nla_put_failure; 807 err = ovs_flow_to_nlattrs(&flow->key, skb); 808 if (err) 809 goto error; 810 nla_nest_end(skb, nla); 811 812 spin_lock_bh(&flow->lock); 813 used = flow->used; 814 stats.n_packets = flow->packet_count; 815 stats.n_bytes = flow->byte_count; 816 tcp_flags = flow->tcp_flags; 817 spin_unlock_bh(&flow->lock); 818 819 if (used && 820 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used))) 821 goto nla_put_failure; 822 823 if (stats.n_packets && 824 nla_put(skb, OVS_FLOW_ATTR_STATS, 825 sizeof(struct ovs_flow_stats), &stats)) 826 goto nla_put_failure; 827 828 if (tcp_flags && 829 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags)) 830 goto nla_put_failure; 831 832 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 833 * this is the first flow to be dumped into 'skb'. This is unusual for 834 * Netlink but individual action lists can be longer than 835 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 836 * The userspace caller can always fetch the actions separately if it 837 * really wants them. (Most userspace callers in fact don't care.) 838 * 839 * This can only fail for dump operations because the skb is always 840 * properly sized for single flows. 841 */ 842 err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len, 843 sf_acts->actions); 844 if (err < 0 && skb_orig_len) 845 goto error; 846 847 return genlmsg_end(skb, ovs_header); 848 849 nla_put_failure: 850 err = -EMSGSIZE; 851 error: 852 genlmsg_cancel(skb, ovs_header); 853 return err; 854 } 855 856 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow) 857 { 858 const struct sw_flow_actions *sf_acts; 859 int len; 860 861 sf_acts = rcu_dereference_protected(flow->sf_acts, 862 lockdep_genl_is_held()); 863 864 /* OVS_FLOW_ATTR_KEY */ 865 len = nla_total_size(FLOW_BUFSIZE); 866 /* OVS_FLOW_ATTR_ACTIONS */ 867 len += nla_total_size(sf_acts->actions_len); 868 /* OVS_FLOW_ATTR_STATS */ 869 len += nla_total_size(sizeof(struct ovs_flow_stats)); 870 /* OVS_FLOW_ATTR_TCP_FLAGS */ 871 len += nla_total_size(1); 872 /* OVS_FLOW_ATTR_USED */ 873 len += nla_total_size(8); 874 875 len += NLMSG_ALIGN(sizeof(struct ovs_header)); 876 877 return genlmsg_new(len, GFP_KERNEL); 878 } 879 880 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow, 881 struct datapath *dp, 882 u32 portid, u32 seq, u8 cmd) 883 { 884 struct sk_buff *skb; 885 int retval; 886 887 skb = ovs_flow_cmd_alloc_info(flow); 888 if (!skb) 889 return ERR_PTR(-ENOMEM); 890 891 retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd); 892 BUG_ON(retval < 0); 893 return skb; 894 } 895 896 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info) 897 { 898 struct nlattr **a = info->attrs; 899 struct ovs_header *ovs_header = info->userhdr; 900 struct sw_flow_key key; 901 struct sw_flow *flow; 902 struct sk_buff *reply; 903 struct datapath *dp; 904 struct flow_table *table; 905 int error; 906 int key_len; 907 908 /* Extract key. */ 909 error = -EINVAL; 910 if (!a[OVS_FLOW_ATTR_KEY]) 911 goto error; 912 error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); 913 if (error) 914 goto error; 915 916 /* Validate actions. */ 917 if (a[OVS_FLOW_ATTR_ACTIONS]) { 918 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0); 919 if (error) 920 goto error; 921 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) { 922 error = -EINVAL; 923 goto error; 924 } 925 926 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 927 error = -ENODEV; 928 if (!dp) 929 goto error; 930 931 table = genl_dereference(dp->table); 932 flow = ovs_flow_tbl_lookup(table, &key, key_len); 933 if (!flow) { 934 struct sw_flow_actions *acts; 935 936 /* Bail out if we're not allowed to create a new flow. */ 937 error = -ENOENT; 938 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET) 939 goto error; 940 941 /* Expand table, if necessary, to make room. */ 942 if (ovs_flow_tbl_need_to_expand(table)) { 943 struct flow_table *new_table; 944 945 new_table = ovs_flow_tbl_expand(table); 946 if (!IS_ERR(new_table)) { 947 rcu_assign_pointer(dp->table, new_table); 948 ovs_flow_tbl_deferred_destroy(table); 949 table = genl_dereference(dp->table); 950 } 951 } 952 953 /* Allocate flow. */ 954 flow = ovs_flow_alloc(); 955 if (IS_ERR(flow)) { 956 error = PTR_ERR(flow); 957 goto error; 958 } 959 flow->key = key; 960 clear_stats(flow); 961 962 /* Obtain actions. */ 963 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]); 964 error = PTR_ERR(acts); 965 if (IS_ERR(acts)) 966 goto error_free_flow; 967 rcu_assign_pointer(flow->sf_acts, acts); 968 969 /* Put flow in bucket. */ 970 flow->hash = ovs_flow_hash(&key, key_len); 971 ovs_flow_tbl_insert(table, flow); 972 973 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, 974 info->snd_seq, 975 OVS_FLOW_CMD_NEW); 976 } else { 977 /* We found a matching flow. */ 978 struct sw_flow_actions *old_acts; 979 struct nlattr *acts_attrs; 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 error = -EEXIST; 988 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW && 989 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL)) 990 goto error; 991 992 /* Update actions. */ 993 old_acts = rcu_dereference_protected(flow->sf_acts, 994 lockdep_genl_is_held()); 995 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS]; 996 if (acts_attrs && 997 (old_acts->actions_len != nla_len(acts_attrs) || 998 memcmp(old_acts->actions, nla_data(acts_attrs), 999 old_acts->actions_len))) { 1000 struct sw_flow_actions *new_acts; 1001 1002 new_acts = ovs_flow_actions_alloc(acts_attrs); 1003 error = PTR_ERR(new_acts); 1004 if (IS_ERR(new_acts)) 1005 goto error; 1006 1007 rcu_assign_pointer(flow->sf_acts, new_acts); 1008 ovs_flow_deferred_free_acts(old_acts); 1009 } 1010 1011 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, 1012 info->snd_seq, OVS_FLOW_CMD_NEW); 1013 1014 /* Clear stats. */ 1015 if (a[OVS_FLOW_ATTR_CLEAR]) { 1016 spin_lock_bh(&flow->lock); 1017 clear_stats(flow); 1018 spin_unlock_bh(&flow->lock); 1019 } 1020 } 1021 1022 if (!IS_ERR(reply)) 1023 genl_notify(reply, genl_info_net(info), info->snd_portid, 1024 ovs_dp_flow_multicast_group.id, info->nlhdr, 1025 GFP_KERNEL); 1026 else 1027 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 1028 ovs_dp_flow_multicast_group.id, PTR_ERR(reply)); 1029 return 0; 1030 1031 error_free_flow: 1032 ovs_flow_free(flow); 1033 error: 1034 return error; 1035 } 1036 1037 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1038 { 1039 struct nlattr **a = info->attrs; 1040 struct ovs_header *ovs_header = info->userhdr; 1041 struct sw_flow_key key; 1042 struct sk_buff *reply; 1043 struct sw_flow *flow; 1044 struct datapath *dp; 1045 struct flow_table *table; 1046 int err; 1047 int key_len; 1048 1049 if (!a[OVS_FLOW_ATTR_KEY]) 1050 return -EINVAL; 1051 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); 1052 if (err) 1053 return err; 1054 1055 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1056 if (!dp) 1057 return -ENODEV; 1058 1059 table = genl_dereference(dp->table); 1060 flow = ovs_flow_tbl_lookup(table, &key, key_len); 1061 if (!flow) 1062 return -ENOENT; 1063 1064 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, 1065 info->snd_seq, OVS_FLOW_CMD_NEW); 1066 if (IS_ERR(reply)) 1067 return PTR_ERR(reply); 1068 1069 return genlmsg_reply(reply, info); 1070 } 1071 1072 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1073 { 1074 struct nlattr **a = info->attrs; 1075 struct ovs_header *ovs_header = info->userhdr; 1076 struct sw_flow_key key; 1077 struct sk_buff *reply; 1078 struct sw_flow *flow; 1079 struct datapath *dp; 1080 struct flow_table *table; 1081 int err; 1082 int key_len; 1083 1084 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1085 if (!dp) 1086 return -ENODEV; 1087 1088 if (!a[OVS_FLOW_ATTR_KEY]) 1089 return flush_flows(dp); 1090 1091 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); 1092 if (err) 1093 return err; 1094 1095 table = genl_dereference(dp->table); 1096 flow = ovs_flow_tbl_lookup(table, &key, key_len); 1097 if (!flow) 1098 return -ENOENT; 1099 1100 reply = ovs_flow_cmd_alloc_info(flow); 1101 if (!reply) 1102 return -ENOMEM; 1103 1104 ovs_flow_tbl_remove(table, flow); 1105 1106 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid, 1107 info->snd_seq, 0, OVS_FLOW_CMD_DEL); 1108 BUG_ON(err < 0); 1109 1110 ovs_flow_deferred_free(flow); 1111 1112 genl_notify(reply, genl_info_net(info), info->snd_portid, 1113 ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL); 1114 return 0; 1115 } 1116 1117 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1118 { 1119 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1120 struct datapath *dp; 1121 struct flow_table *table; 1122 1123 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1124 if (!dp) 1125 return -ENODEV; 1126 1127 table = genl_dereference(dp->table); 1128 1129 for (;;) { 1130 struct sw_flow *flow; 1131 u32 bucket, obj; 1132 1133 bucket = cb->args[0]; 1134 obj = cb->args[1]; 1135 flow = ovs_flow_tbl_next(table, &bucket, &obj); 1136 if (!flow) 1137 break; 1138 1139 if (ovs_flow_cmd_fill_info(flow, dp, skb, 1140 NETLINK_CB(cb->skb).portid, 1141 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1142 OVS_FLOW_CMD_NEW) < 0) 1143 break; 1144 1145 cb->args[0] = bucket; 1146 cb->args[1] = obj; 1147 } 1148 return skb->len; 1149 } 1150 1151 static struct genl_ops dp_flow_genl_ops[] = { 1152 { .cmd = OVS_FLOW_CMD_NEW, 1153 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1154 .policy = flow_policy, 1155 .doit = ovs_flow_cmd_new_or_set 1156 }, 1157 { .cmd = OVS_FLOW_CMD_DEL, 1158 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1159 .policy = flow_policy, 1160 .doit = ovs_flow_cmd_del 1161 }, 1162 { .cmd = OVS_FLOW_CMD_GET, 1163 .flags = 0, /* OK for unprivileged users. */ 1164 .policy = flow_policy, 1165 .doit = ovs_flow_cmd_get, 1166 .dumpit = ovs_flow_cmd_dump 1167 }, 1168 { .cmd = OVS_FLOW_CMD_SET, 1169 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1170 .policy = flow_policy, 1171 .doit = ovs_flow_cmd_new_or_set, 1172 }, 1173 }; 1174 1175 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1176 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1177 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1178 }; 1179 1180 static struct genl_family dp_datapath_genl_family = { 1181 .id = GENL_ID_GENERATE, 1182 .hdrsize = sizeof(struct ovs_header), 1183 .name = OVS_DATAPATH_FAMILY, 1184 .version = OVS_DATAPATH_VERSION, 1185 .maxattr = OVS_DP_ATTR_MAX, 1186 .netnsok = true 1187 }; 1188 1189 static struct genl_multicast_group ovs_dp_datapath_multicast_group = { 1190 .name = OVS_DATAPATH_MCGROUP 1191 }; 1192 1193 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1194 u32 portid, u32 seq, u32 flags, u8 cmd) 1195 { 1196 struct ovs_header *ovs_header; 1197 struct ovs_dp_stats dp_stats; 1198 int err; 1199 1200 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1201 flags, cmd); 1202 if (!ovs_header) 1203 goto error; 1204 1205 ovs_header->dp_ifindex = get_dpifindex(dp); 1206 1207 rcu_read_lock(); 1208 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1209 rcu_read_unlock(); 1210 if (err) 1211 goto nla_put_failure; 1212 1213 get_dp_stats(dp, &dp_stats); 1214 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats)) 1215 goto nla_put_failure; 1216 1217 return genlmsg_end(skb, ovs_header); 1218 1219 nla_put_failure: 1220 genlmsg_cancel(skb, ovs_header); 1221 error: 1222 return -EMSGSIZE; 1223 } 1224 1225 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid, 1226 u32 seq, u8 cmd) 1227 { 1228 struct sk_buff *skb; 1229 int retval; 1230 1231 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1232 if (!skb) 1233 return ERR_PTR(-ENOMEM); 1234 1235 retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd); 1236 if (retval < 0) { 1237 kfree_skb(skb); 1238 return ERR_PTR(retval); 1239 } 1240 return skb; 1241 } 1242 1243 /* Called with genl_mutex and optionally with RTNL lock also. */ 1244 static struct datapath *lookup_datapath(struct net *net, 1245 struct ovs_header *ovs_header, 1246 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1247 { 1248 struct datapath *dp; 1249 1250 if (!a[OVS_DP_ATTR_NAME]) 1251 dp = get_dp(net, ovs_header->dp_ifindex); 1252 else { 1253 struct vport *vport; 1254 1255 rcu_read_lock(); 1256 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1257 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1258 rcu_read_unlock(); 1259 } 1260 return dp ? dp : ERR_PTR(-ENODEV); 1261 } 1262 1263 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1264 { 1265 struct nlattr **a = info->attrs; 1266 struct vport_parms parms; 1267 struct sk_buff *reply; 1268 struct datapath *dp; 1269 struct vport *vport; 1270 struct ovs_net *ovs_net; 1271 int err, i; 1272 1273 err = -EINVAL; 1274 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1275 goto err; 1276 1277 rtnl_lock(); 1278 1279 err = -ENOMEM; 1280 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1281 if (dp == NULL) 1282 goto err_unlock_rtnl; 1283 1284 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk))); 1285 1286 /* Allocate table. */ 1287 err = -ENOMEM; 1288 rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS)); 1289 if (!dp->table) 1290 goto err_free_dp; 1291 1292 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu); 1293 if (!dp->stats_percpu) { 1294 err = -ENOMEM; 1295 goto err_destroy_table; 1296 } 1297 1298 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head), 1299 GFP_KERNEL); 1300 if (!dp->ports) { 1301 err = -ENOMEM; 1302 goto err_destroy_percpu; 1303 } 1304 1305 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1306 INIT_HLIST_HEAD(&dp->ports[i]); 1307 1308 /* Set up our datapath device. */ 1309 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1310 parms.type = OVS_VPORT_TYPE_INTERNAL; 1311 parms.options = NULL; 1312 parms.dp = dp; 1313 parms.port_no = OVSP_LOCAL; 1314 parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]); 1315 1316 vport = new_vport(&parms); 1317 if (IS_ERR(vport)) { 1318 err = PTR_ERR(vport); 1319 if (err == -EBUSY) 1320 err = -EEXIST; 1321 1322 goto err_destroy_ports_array; 1323 } 1324 1325 reply = ovs_dp_cmd_build_info(dp, info->snd_portid, 1326 info->snd_seq, OVS_DP_CMD_NEW); 1327 err = PTR_ERR(reply); 1328 if (IS_ERR(reply)) 1329 goto err_destroy_local_port; 1330 1331 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1332 list_add_tail(&dp->list_node, &ovs_net->dps); 1333 rtnl_unlock(); 1334 1335 genl_notify(reply, genl_info_net(info), info->snd_portid, 1336 ovs_dp_datapath_multicast_group.id, info->nlhdr, 1337 GFP_KERNEL); 1338 return 0; 1339 1340 err_destroy_local_port: 1341 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL)); 1342 err_destroy_ports_array: 1343 kfree(dp->ports); 1344 err_destroy_percpu: 1345 free_percpu(dp->stats_percpu); 1346 err_destroy_table: 1347 ovs_flow_tbl_destroy(genl_dereference(dp->table)); 1348 err_free_dp: 1349 release_net(ovs_dp_get_net(dp)); 1350 kfree(dp); 1351 err_unlock_rtnl: 1352 rtnl_unlock(); 1353 err: 1354 return err; 1355 } 1356 1357 /* Called with genl_mutex. */ 1358 static void __dp_destroy(struct datapath *dp) 1359 { 1360 int i; 1361 1362 rtnl_lock(); 1363 1364 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1365 struct vport *vport; 1366 struct hlist_node *node, *n; 1367 1368 hlist_for_each_entry_safe(vport, node, n, &dp->ports[i], dp_hash_node) 1369 if (vport->port_no != OVSP_LOCAL) 1370 ovs_dp_detach_port(vport); 1371 } 1372 1373 list_del(&dp->list_node); 1374 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL)); 1375 1376 /* rtnl_unlock() will wait until all the references to devices that 1377 * are pending unregistration have been dropped. We do it here to 1378 * ensure that any internal devices (which contain DP pointers) are 1379 * fully destroyed before freeing the datapath. 1380 */ 1381 rtnl_unlock(); 1382 1383 call_rcu(&dp->rcu, destroy_dp_rcu); 1384 } 1385 1386 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1387 { 1388 struct sk_buff *reply; 1389 struct datapath *dp; 1390 int err; 1391 1392 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1393 err = PTR_ERR(dp); 1394 if (IS_ERR(dp)) 1395 return err; 1396 1397 reply = ovs_dp_cmd_build_info(dp, info->snd_portid, 1398 info->snd_seq, OVS_DP_CMD_DEL); 1399 err = PTR_ERR(reply); 1400 if (IS_ERR(reply)) 1401 return err; 1402 1403 __dp_destroy(dp); 1404 1405 genl_notify(reply, genl_info_net(info), info->snd_portid, 1406 ovs_dp_datapath_multicast_group.id, info->nlhdr, 1407 GFP_KERNEL); 1408 1409 return 0; 1410 } 1411 1412 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1413 { 1414 struct sk_buff *reply; 1415 struct datapath *dp; 1416 int err; 1417 1418 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1419 if (IS_ERR(dp)) 1420 return PTR_ERR(dp); 1421 1422 reply = ovs_dp_cmd_build_info(dp, info->snd_portid, 1423 info->snd_seq, OVS_DP_CMD_NEW); 1424 if (IS_ERR(reply)) { 1425 err = PTR_ERR(reply); 1426 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 1427 ovs_dp_datapath_multicast_group.id, err); 1428 return 0; 1429 } 1430 1431 genl_notify(reply, genl_info_net(info), info->snd_portid, 1432 ovs_dp_datapath_multicast_group.id, info->nlhdr, 1433 GFP_KERNEL); 1434 1435 return 0; 1436 } 1437 1438 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1439 { 1440 struct sk_buff *reply; 1441 struct datapath *dp; 1442 1443 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1444 if (IS_ERR(dp)) 1445 return PTR_ERR(dp); 1446 1447 reply = ovs_dp_cmd_build_info(dp, info->snd_portid, 1448 info->snd_seq, OVS_DP_CMD_NEW); 1449 if (IS_ERR(reply)) 1450 return PTR_ERR(reply); 1451 1452 return genlmsg_reply(reply, info); 1453 } 1454 1455 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1456 { 1457 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1458 struct datapath *dp; 1459 int skip = cb->args[0]; 1460 int i = 0; 1461 1462 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1463 if (i >= skip && 1464 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1465 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1466 OVS_DP_CMD_NEW) < 0) 1467 break; 1468 i++; 1469 } 1470 1471 cb->args[0] = i; 1472 1473 return skb->len; 1474 } 1475 1476 static struct genl_ops dp_datapath_genl_ops[] = { 1477 { .cmd = OVS_DP_CMD_NEW, 1478 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1479 .policy = datapath_policy, 1480 .doit = ovs_dp_cmd_new 1481 }, 1482 { .cmd = OVS_DP_CMD_DEL, 1483 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1484 .policy = datapath_policy, 1485 .doit = ovs_dp_cmd_del 1486 }, 1487 { .cmd = OVS_DP_CMD_GET, 1488 .flags = 0, /* OK for unprivileged users. */ 1489 .policy = datapath_policy, 1490 .doit = ovs_dp_cmd_get, 1491 .dumpit = ovs_dp_cmd_dump 1492 }, 1493 { .cmd = OVS_DP_CMD_SET, 1494 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1495 .policy = datapath_policy, 1496 .doit = ovs_dp_cmd_set, 1497 }, 1498 }; 1499 1500 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 1501 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1502 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 1503 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 1504 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 1505 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1506 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 1507 }; 1508 1509 static struct genl_family dp_vport_genl_family = { 1510 .id = GENL_ID_GENERATE, 1511 .hdrsize = sizeof(struct ovs_header), 1512 .name = OVS_VPORT_FAMILY, 1513 .version = OVS_VPORT_VERSION, 1514 .maxattr = OVS_VPORT_ATTR_MAX, 1515 .netnsok = true 1516 }; 1517 1518 struct genl_multicast_group ovs_dp_vport_multicast_group = { 1519 .name = OVS_VPORT_MCGROUP 1520 }; 1521 1522 /* Called with RTNL lock or RCU read lock. */ 1523 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1524 u32 portid, u32 seq, u32 flags, u8 cmd) 1525 { 1526 struct ovs_header *ovs_header; 1527 struct ovs_vport_stats vport_stats; 1528 int err; 1529 1530 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1531 flags, cmd); 1532 if (!ovs_header) 1533 return -EMSGSIZE; 1534 1535 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1536 1537 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1538 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1539 nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) || 1540 nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid)) 1541 goto nla_put_failure; 1542 1543 ovs_vport_get_stats(vport, &vport_stats); 1544 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), 1545 &vport_stats)) 1546 goto nla_put_failure; 1547 1548 err = ovs_vport_get_options(vport, skb); 1549 if (err == -EMSGSIZE) 1550 goto error; 1551 1552 return genlmsg_end(skb, ovs_header); 1553 1554 nla_put_failure: 1555 err = -EMSGSIZE; 1556 error: 1557 genlmsg_cancel(skb, ovs_header); 1558 return err; 1559 } 1560 1561 /* Called with RTNL lock or RCU read lock. */ 1562 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid, 1563 u32 seq, u8 cmd) 1564 { 1565 struct sk_buff *skb; 1566 int retval; 1567 1568 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1569 if (!skb) 1570 return ERR_PTR(-ENOMEM); 1571 1572 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd); 1573 if (retval < 0) { 1574 kfree_skb(skb); 1575 return ERR_PTR(retval); 1576 } 1577 return skb; 1578 } 1579 1580 /* Called with RTNL lock or RCU read lock. */ 1581 static struct vport *lookup_vport(struct net *net, 1582 struct ovs_header *ovs_header, 1583 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1584 { 1585 struct datapath *dp; 1586 struct vport *vport; 1587 1588 if (a[OVS_VPORT_ATTR_NAME]) { 1589 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 1590 if (!vport) 1591 return ERR_PTR(-ENODEV); 1592 if (ovs_header->dp_ifindex && 1593 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 1594 return ERR_PTR(-ENODEV); 1595 return vport; 1596 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 1597 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1598 1599 if (port_no >= DP_MAX_PORTS) 1600 return ERR_PTR(-EFBIG); 1601 1602 dp = get_dp(net, ovs_header->dp_ifindex); 1603 if (!dp) 1604 return ERR_PTR(-ENODEV); 1605 1606 vport = ovs_vport_rtnl_rcu(dp, port_no); 1607 if (!vport) 1608 return ERR_PTR(-ENOENT); 1609 return vport; 1610 } else 1611 return ERR_PTR(-EINVAL); 1612 } 1613 1614 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 1615 { 1616 struct nlattr **a = info->attrs; 1617 struct ovs_header *ovs_header = info->userhdr; 1618 struct vport_parms parms; 1619 struct sk_buff *reply; 1620 struct vport *vport; 1621 struct datapath *dp; 1622 u32 port_no; 1623 int err; 1624 1625 err = -EINVAL; 1626 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 1627 !a[OVS_VPORT_ATTR_UPCALL_PID]) 1628 goto exit; 1629 1630 rtnl_lock(); 1631 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1632 err = -ENODEV; 1633 if (!dp) 1634 goto exit_unlock; 1635 1636 if (a[OVS_VPORT_ATTR_PORT_NO]) { 1637 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1638 1639 err = -EFBIG; 1640 if (port_no >= DP_MAX_PORTS) 1641 goto exit_unlock; 1642 1643 vport = ovs_vport_rtnl_rcu(dp, port_no); 1644 err = -EBUSY; 1645 if (vport) 1646 goto exit_unlock; 1647 } else { 1648 for (port_no = 1; ; port_no++) { 1649 if (port_no >= DP_MAX_PORTS) { 1650 err = -EFBIG; 1651 goto exit_unlock; 1652 } 1653 vport = ovs_vport_rtnl(dp, port_no); 1654 if (!vport) 1655 break; 1656 } 1657 } 1658 1659 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 1660 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 1661 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 1662 parms.dp = dp; 1663 parms.port_no = port_no; 1664 parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); 1665 1666 vport = new_vport(&parms); 1667 err = PTR_ERR(vport); 1668 if (IS_ERR(vport)) 1669 goto exit_unlock; 1670 1671 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, 1672 OVS_VPORT_CMD_NEW); 1673 if (IS_ERR(reply)) { 1674 err = PTR_ERR(reply); 1675 ovs_dp_detach_port(vport); 1676 goto exit_unlock; 1677 } 1678 genl_notify(reply, genl_info_net(info), info->snd_portid, 1679 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); 1680 1681 exit_unlock: 1682 rtnl_unlock(); 1683 exit: 1684 return err; 1685 } 1686 1687 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 1688 { 1689 struct nlattr **a = info->attrs; 1690 struct sk_buff *reply; 1691 struct vport *vport; 1692 int err; 1693 1694 rtnl_lock(); 1695 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1696 err = PTR_ERR(vport); 1697 if (IS_ERR(vport)) 1698 goto exit_unlock; 1699 1700 err = 0; 1701 if (a[OVS_VPORT_ATTR_TYPE] && 1702 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) 1703 err = -EINVAL; 1704 1705 if (!err && a[OVS_VPORT_ATTR_OPTIONS]) 1706 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 1707 if (err) 1708 goto exit_unlock; 1709 if (a[OVS_VPORT_ATTR_UPCALL_PID]) 1710 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); 1711 1712 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, 1713 OVS_VPORT_CMD_NEW); 1714 if (IS_ERR(reply)) { 1715 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 1716 ovs_dp_vport_multicast_group.id, PTR_ERR(reply)); 1717 goto exit_unlock; 1718 } 1719 1720 genl_notify(reply, genl_info_net(info), info->snd_portid, 1721 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); 1722 1723 exit_unlock: 1724 rtnl_unlock(); 1725 return err; 1726 } 1727 1728 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 1729 { 1730 struct nlattr **a = info->attrs; 1731 struct sk_buff *reply; 1732 struct vport *vport; 1733 int err; 1734 1735 rtnl_lock(); 1736 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1737 err = PTR_ERR(vport); 1738 if (IS_ERR(vport)) 1739 goto exit_unlock; 1740 1741 if (vport->port_no == OVSP_LOCAL) { 1742 err = -EINVAL; 1743 goto exit_unlock; 1744 } 1745 1746 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, 1747 OVS_VPORT_CMD_DEL); 1748 err = PTR_ERR(reply); 1749 if (IS_ERR(reply)) 1750 goto exit_unlock; 1751 1752 ovs_dp_detach_port(vport); 1753 1754 genl_notify(reply, genl_info_net(info), info->snd_portid, 1755 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); 1756 1757 exit_unlock: 1758 rtnl_unlock(); 1759 return err; 1760 } 1761 1762 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 1763 { 1764 struct nlattr **a = info->attrs; 1765 struct ovs_header *ovs_header = info->userhdr; 1766 struct sk_buff *reply; 1767 struct vport *vport; 1768 int err; 1769 1770 rcu_read_lock(); 1771 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 1772 err = PTR_ERR(vport); 1773 if (IS_ERR(vport)) 1774 goto exit_unlock; 1775 1776 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, 1777 OVS_VPORT_CMD_NEW); 1778 err = PTR_ERR(reply); 1779 if (IS_ERR(reply)) 1780 goto exit_unlock; 1781 1782 rcu_read_unlock(); 1783 1784 return genlmsg_reply(reply, info); 1785 1786 exit_unlock: 1787 rcu_read_unlock(); 1788 return err; 1789 } 1790 1791 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1792 { 1793 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1794 struct datapath *dp; 1795 int bucket = cb->args[0], skip = cb->args[1]; 1796 int i, j = 0; 1797 1798 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1799 if (!dp) 1800 return -ENODEV; 1801 1802 rcu_read_lock(); 1803 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 1804 struct vport *vport; 1805 struct hlist_node *n; 1806 1807 j = 0; 1808 hlist_for_each_entry_rcu(vport, n, &dp->ports[i], dp_hash_node) { 1809 if (j >= skip && 1810 ovs_vport_cmd_fill_info(vport, skb, 1811 NETLINK_CB(cb->skb).portid, 1812 cb->nlh->nlmsg_seq, 1813 NLM_F_MULTI, 1814 OVS_VPORT_CMD_NEW) < 0) 1815 goto out; 1816 1817 j++; 1818 } 1819 skip = 0; 1820 } 1821 out: 1822 rcu_read_unlock(); 1823 1824 cb->args[0] = i; 1825 cb->args[1] = j; 1826 1827 return skb->len; 1828 } 1829 1830 static struct genl_ops dp_vport_genl_ops[] = { 1831 { .cmd = OVS_VPORT_CMD_NEW, 1832 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1833 .policy = vport_policy, 1834 .doit = ovs_vport_cmd_new 1835 }, 1836 { .cmd = OVS_VPORT_CMD_DEL, 1837 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1838 .policy = vport_policy, 1839 .doit = ovs_vport_cmd_del 1840 }, 1841 { .cmd = OVS_VPORT_CMD_GET, 1842 .flags = 0, /* OK for unprivileged users. */ 1843 .policy = vport_policy, 1844 .doit = ovs_vport_cmd_get, 1845 .dumpit = ovs_vport_cmd_dump 1846 }, 1847 { .cmd = OVS_VPORT_CMD_SET, 1848 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1849 .policy = vport_policy, 1850 .doit = ovs_vport_cmd_set, 1851 }, 1852 }; 1853 1854 struct genl_family_and_ops { 1855 struct genl_family *family; 1856 struct genl_ops *ops; 1857 int n_ops; 1858 struct genl_multicast_group *group; 1859 }; 1860 1861 static const struct genl_family_and_ops dp_genl_families[] = { 1862 { &dp_datapath_genl_family, 1863 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops), 1864 &ovs_dp_datapath_multicast_group }, 1865 { &dp_vport_genl_family, 1866 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops), 1867 &ovs_dp_vport_multicast_group }, 1868 { &dp_flow_genl_family, 1869 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops), 1870 &ovs_dp_flow_multicast_group }, 1871 { &dp_packet_genl_family, 1872 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops), 1873 NULL }, 1874 }; 1875 1876 static void dp_unregister_genl(int n_families) 1877 { 1878 int i; 1879 1880 for (i = 0; i < n_families; i++) 1881 genl_unregister_family(dp_genl_families[i].family); 1882 } 1883 1884 static int dp_register_genl(void) 1885 { 1886 int n_registered; 1887 int err; 1888 int i; 1889 1890 n_registered = 0; 1891 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 1892 const struct genl_family_and_ops *f = &dp_genl_families[i]; 1893 1894 err = genl_register_family_with_ops(f->family, f->ops, 1895 f->n_ops); 1896 if (err) 1897 goto error; 1898 n_registered++; 1899 1900 if (f->group) { 1901 err = genl_register_mc_group(f->family, f->group); 1902 if (err) 1903 goto error; 1904 } 1905 } 1906 1907 return 0; 1908 1909 error: 1910 dp_unregister_genl(n_registered); 1911 return err; 1912 } 1913 1914 static void rehash_flow_table(struct work_struct *work) 1915 { 1916 struct datapath *dp; 1917 struct net *net; 1918 1919 genl_lock(); 1920 rtnl_lock(); 1921 for_each_net(net) { 1922 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1923 1924 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1925 struct flow_table *old_table = genl_dereference(dp->table); 1926 struct flow_table *new_table; 1927 1928 new_table = ovs_flow_tbl_rehash(old_table); 1929 if (!IS_ERR(new_table)) { 1930 rcu_assign_pointer(dp->table, new_table); 1931 ovs_flow_tbl_deferred_destroy(old_table); 1932 } 1933 } 1934 } 1935 rtnl_unlock(); 1936 genl_unlock(); 1937 1938 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); 1939 } 1940 1941 static int __net_init ovs_init_net(struct net *net) 1942 { 1943 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1944 1945 INIT_LIST_HEAD(&ovs_net->dps); 1946 return 0; 1947 } 1948 1949 static void __net_exit ovs_exit_net(struct net *net) 1950 { 1951 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1952 struct datapath *dp, *dp_next; 1953 1954 genl_lock(); 1955 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 1956 __dp_destroy(dp); 1957 genl_unlock(); 1958 } 1959 1960 static struct pernet_operations ovs_net_ops = { 1961 .init = ovs_init_net, 1962 .exit = ovs_exit_net, 1963 .id = &ovs_net_id, 1964 .size = sizeof(struct ovs_net), 1965 }; 1966 1967 static int __init dp_init(void) 1968 { 1969 struct sk_buff *dummy_skb; 1970 int err; 1971 1972 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb)); 1973 1974 pr_info("Open vSwitch switching datapath\n"); 1975 1976 err = ovs_flow_init(); 1977 if (err) 1978 goto error; 1979 1980 err = ovs_vport_init(); 1981 if (err) 1982 goto error_flow_exit; 1983 1984 err = register_pernet_device(&ovs_net_ops); 1985 if (err) 1986 goto error_vport_exit; 1987 1988 err = register_netdevice_notifier(&ovs_dp_device_notifier); 1989 if (err) 1990 goto error_netns_exit; 1991 1992 err = dp_register_genl(); 1993 if (err < 0) 1994 goto error_unreg_notifier; 1995 1996 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); 1997 1998 return 0; 1999 2000 error_unreg_notifier: 2001 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2002 error_netns_exit: 2003 unregister_pernet_device(&ovs_net_ops); 2004 error_vport_exit: 2005 ovs_vport_exit(); 2006 error_flow_exit: 2007 ovs_flow_exit(); 2008 error: 2009 return err; 2010 } 2011 2012 static void dp_cleanup(void) 2013 { 2014 cancel_delayed_work_sync(&rehash_flow_wq); 2015 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2016 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2017 unregister_pernet_device(&ovs_net_ops); 2018 rcu_barrier(); 2019 ovs_vport_exit(); 2020 ovs_flow_exit(); 2021 } 2022 2023 module_init(dp_init); 2024 module_exit(dp_cleanup); 2025 2026 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2027 MODULE_LICENSE("GPL"); 2028