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_head *head; 162 163 head = vport_hash_bucket(dp, port_no); 164 hlist_for_each_entry_rcu(vport, head, dp_hash_node) { 165 if (vport->port_no == port_no) 166 return vport; 167 } 168 return NULL; 169 } 170 171 /* Called with RTNL lock and genl_lock. */ 172 static struct vport *new_vport(const struct vport_parms *parms) 173 { 174 struct vport *vport; 175 176 vport = ovs_vport_add(parms); 177 if (!IS_ERR(vport)) { 178 struct datapath *dp = parms->dp; 179 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 180 181 hlist_add_head_rcu(&vport->dp_hash_node, head); 182 } 183 184 return vport; 185 } 186 187 /* Called with RTNL lock. */ 188 void ovs_dp_detach_port(struct vport *p) 189 { 190 ASSERT_RTNL(); 191 192 /* First drop references to device. */ 193 hlist_del_rcu(&p->dp_hash_node); 194 195 /* Then destroy it. */ 196 ovs_vport_del(p); 197 } 198 199 /* Must be called with rcu_read_lock. */ 200 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb) 201 { 202 struct datapath *dp = p->dp; 203 struct sw_flow *flow; 204 struct dp_stats_percpu *stats; 205 struct sw_flow_key key; 206 u64 *stats_counter; 207 int error; 208 int key_len; 209 210 stats = this_cpu_ptr(dp->stats_percpu); 211 212 /* Extract flow from 'skb' into 'key'. */ 213 error = ovs_flow_extract(skb, p->port_no, &key, &key_len); 214 if (unlikely(error)) { 215 kfree_skb(skb); 216 return; 217 } 218 219 /* Look up flow. */ 220 flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len); 221 if (unlikely(!flow)) { 222 struct dp_upcall_info upcall; 223 224 upcall.cmd = OVS_PACKET_CMD_MISS; 225 upcall.key = &key; 226 upcall.userdata = NULL; 227 upcall.portid = p->upcall_portid; 228 ovs_dp_upcall(dp, skb, &upcall); 229 consume_skb(skb); 230 stats_counter = &stats->n_missed; 231 goto out; 232 } 233 234 OVS_CB(skb)->flow = flow; 235 236 stats_counter = &stats->n_hit; 237 ovs_flow_used(OVS_CB(skb)->flow, skb); 238 ovs_execute_actions(dp, skb); 239 240 out: 241 /* Update datapath statistics. */ 242 u64_stats_update_begin(&stats->sync); 243 (*stats_counter)++; 244 u64_stats_update_end(&stats->sync); 245 } 246 247 static struct genl_family dp_packet_genl_family = { 248 .id = GENL_ID_GENERATE, 249 .hdrsize = sizeof(struct ovs_header), 250 .name = OVS_PACKET_FAMILY, 251 .version = OVS_PACKET_VERSION, 252 .maxattr = OVS_PACKET_ATTR_MAX, 253 .netnsok = true 254 }; 255 256 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 257 const struct dp_upcall_info *upcall_info) 258 { 259 struct dp_stats_percpu *stats; 260 int dp_ifindex; 261 int err; 262 263 if (upcall_info->portid == 0) { 264 err = -ENOTCONN; 265 goto err; 266 } 267 268 dp_ifindex = get_dpifindex(dp); 269 if (!dp_ifindex) { 270 err = -ENODEV; 271 goto err; 272 } 273 274 if (!skb_is_gso(skb)) 275 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info); 276 else 277 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info); 278 if (err) 279 goto err; 280 281 return 0; 282 283 err: 284 stats = this_cpu_ptr(dp->stats_percpu); 285 286 u64_stats_update_begin(&stats->sync); 287 stats->n_lost++; 288 u64_stats_update_end(&stats->sync); 289 290 return err; 291 } 292 293 static int queue_gso_packets(struct net *net, int dp_ifindex, 294 struct sk_buff *skb, 295 const struct dp_upcall_info *upcall_info) 296 { 297 unsigned short gso_type = skb_shinfo(skb)->gso_type; 298 struct dp_upcall_info later_info; 299 struct sw_flow_key later_key; 300 struct sk_buff *segs, *nskb; 301 int err; 302 303 segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false); 304 if (IS_ERR(segs)) 305 return PTR_ERR(segs); 306 307 /* Queue all of the segments. */ 308 skb = segs; 309 do { 310 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info); 311 if (err) 312 break; 313 314 if (skb == segs && gso_type & SKB_GSO_UDP) { 315 /* The initial flow key extracted by ovs_flow_extract() 316 * in this case is for a first fragment, so we need to 317 * properly mark later fragments. 318 */ 319 later_key = *upcall_info->key; 320 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 321 322 later_info = *upcall_info; 323 later_info.key = &later_key; 324 upcall_info = &later_info; 325 } 326 } while ((skb = skb->next)); 327 328 /* Free all of the segments. */ 329 skb = segs; 330 do { 331 nskb = skb->next; 332 if (err) 333 kfree_skb(skb); 334 else 335 consume_skb(skb); 336 } while ((skb = nskb)); 337 return err; 338 } 339 340 static int queue_userspace_packet(struct net *net, int dp_ifindex, 341 struct sk_buff *skb, 342 const struct dp_upcall_info *upcall_info) 343 { 344 struct ovs_header *upcall; 345 struct sk_buff *nskb = NULL; 346 struct sk_buff *user_skb; /* to be queued to userspace */ 347 struct nlattr *nla; 348 unsigned int len; 349 int err; 350 351 if (vlan_tx_tag_present(skb)) { 352 nskb = skb_clone(skb, GFP_ATOMIC); 353 if (!nskb) 354 return -ENOMEM; 355 356 nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb)); 357 if (!nskb) 358 return -ENOMEM; 359 360 nskb->vlan_tci = 0; 361 skb = nskb; 362 } 363 364 if (nla_attr_size(skb->len) > USHRT_MAX) { 365 err = -EFBIG; 366 goto out; 367 } 368 369 len = sizeof(struct ovs_header); 370 len += nla_total_size(skb->len); 371 len += nla_total_size(FLOW_BUFSIZE); 372 if (upcall_info->cmd == OVS_PACKET_CMD_ACTION) 373 len += nla_total_size(8); 374 375 user_skb = genlmsg_new(len, GFP_ATOMIC); 376 if (!user_skb) { 377 err = -ENOMEM; 378 goto out; 379 } 380 381 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 382 0, upcall_info->cmd); 383 upcall->dp_ifindex = dp_ifindex; 384 385 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY); 386 ovs_flow_to_nlattrs(upcall_info->key, user_skb); 387 nla_nest_end(user_skb, nla); 388 389 if (upcall_info->userdata) 390 nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA, 391 nla_get_u64(upcall_info->userdata)); 392 393 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len); 394 395 skb_copy_and_csum_dev(skb, nla_data(nla)); 396 397 genlmsg_end(user_skb, upcall); 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 const struct ovs_key_ipv6 *ipv6_key; 483 484 case OVS_KEY_ATTR_PRIORITY: 485 case OVS_KEY_ATTR_SKB_MARK: 486 case OVS_KEY_ATTR_ETHERNET: 487 break; 488 489 case OVS_KEY_ATTR_IPV4: 490 if (flow_key->eth.type != htons(ETH_P_IP)) 491 return -EINVAL; 492 493 if (!flow_key->ip.proto) 494 return -EINVAL; 495 496 ipv4_key = nla_data(ovs_key); 497 if (ipv4_key->ipv4_proto != flow_key->ip.proto) 498 return -EINVAL; 499 500 if (ipv4_key->ipv4_frag != flow_key->ip.frag) 501 return -EINVAL; 502 503 break; 504 505 case OVS_KEY_ATTR_IPV6: 506 if (flow_key->eth.type != htons(ETH_P_IPV6)) 507 return -EINVAL; 508 509 if (!flow_key->ip.proto) 510 return -EINVAL; 511 512 ipv6_key = nla_data(ovs_key); 513 if (ipv6_key->ipv6_proto != flow_key->ip.proto) 514 return -EINVAL; 515 516 if (ipv6_key->ipv6_frag != flow_key->ip.frag) 517 return -EINVAL; 518 519 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000) 520 return -EINVAL; 521 522 break; 523 524 case OVS_KEY_ATTR_TCP: 525 if (flow_key->ip.proto != IPPROTO_TCP) 526 return -EINVAL; 527 528 return validate_tp_port(flow_key); 529 530 case OVS_KEY_ATTR_UDP: 531 if (flow_key->ip.proto != IPPROTO_UDP) 532 return -EINVAL; 533 534 return validate_tp_port(flow_key); 535 536 default: 537 return -EINVAL; 538 } 539 540 return 0; 541 } 542 543 static int validate_userspace(const struct nlattr *attr) 544 { 545 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = { 546 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 }, 547 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 }, 548 }; 549 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1]; 550 int error; 551 552 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX, 553 attr, userspace_policy); 554 if (error) 555 return error; 556 557 if (!a[OVS_USERSPACE_ATTR_PID] || 558 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID])) 559 return -EINVAL; 560 561 return 0; 562 } 563 564 static int validate_actions(const struct nlattr *attr, 565 const struct sw_flow_key *key, int depth) 566 { 567 const struct nlattr *a; 568 int rem, err; 569 570 if (depth >= SAMPLE_ACTION_DEPTH) 571 return -EOVERFLOW; 572 573 nla_for_each_nested(a, attr, rem) { 574 /* Expected argument lengths, (u32)-1 for variable length. */ 575 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = { 576 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32), 577 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1, 578 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan), 579 [OVS_ACTION_ATTR_POP_VLAN] = 0, 580 [OVS_ACTION_ATTR_SET] = (u32)-1, 581 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1 582 }; 583 const struct ovs_action_push_vlan *vlan; 584 int type = nla_type(a); 585 586 if (type > OVS_ACTION_ATTR_MAX || 587 (action_lens[type] != nla_len(a) && 588 action_lens[type] != (u32)-1)) 589 return -EINVAL; 590 591 switch (type) { 592 case OVS_ACTION_ATTR_UNSPEC: 593 return -EINVAL; 594 595 case OVS_ACTION_ATTR_USERSPACE: 596 err = validate_userspace(a); 597 if (err) 598 return err; 599 break; 600 601 case OVS_ACTION_ATTR_OUTPUT: 602 if (nla_get_u32(a) >= DP_MAX_PORTS) 603 return -EINVAL; 604 break; 605 606 607 case OVS_ACTION_ATTR_POP_VLAN: 608 break; 609 610 case OVS_ACTION_ATTR_PUSH_VLAN: 611 vlan = nla_data(a); 612 if (vlan->vlan_tpid != htons(ETH_P_8021Q)) 613 return -EINVAL; 614 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT))) 615 return -EINVAL; 616 break; 617 618 case OVS_ACTION_ATTR_SET: 619 err = validate_set(a, key); 620 if (err) 621 return err; 622 break; 623 624 case OVS_ACTION_ATTR_SAMPLE: 625 err = validate_sample(a, key, depth); 626 if (err) 627 return err; 628 break; 629 630 default: 631 return -EINVAL; 632 } 633 } 634 635 if (rem > 0) 636 return -EINVAL; 637 638 return 0; 639 } 640 641 static void clear_stats(struct sw_flow *flow) 642 { 643 flow->used = 0; 644 flow->tcp_flags = 0; 645 flow->packet_count = 0; 646 flow->byte_count = 0; 647 } 648 649 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 650 { 651 struct ovs_header *ovs_header = info->userhdr; 652 struct nlattr **a = info->attrs; 653 struct sw_flow_actions *acts; 654 struct sk_buff *packet; 655 struct sw_flow *flow; 656 struct datapath *dp; 657 struct ethhdr *eth; 658 int len; 659 int err; 660 int key_len; 661 662 err = -EINVAL; 663 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 664 !a[OVS_PACKET_ATTR_ACTIONS] || 665 nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN) 666 goto err; 667 668 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 669 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 670 err = -ENOMEM; 671 if (!packet) 672 goto err; 673 skb_reserve(packet, NET_IP_ALIGN); 674 675 memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len); 676 677 skb_reset_mac_header(packet); 678 eth = eth_hdr(packet); 679 680 /* Normally, setting the skb 'protocol' field would be handled by a 681 * call to eth_type_trans(), but it assumes there's a sending 682 * device, which we may not have. */ 683 if (ntohs(eth->h_proto) >= 1536) 684 packet->protocol = eth->h_proto; 685 else 686 packet->protocol = htons(ETH_P_802_2); 687 688 /* Build an sw_flow for sending this packet. */ 689 flow = ovs_flow_alloc(); 690 err = PTR_ERR(flow); 691 if (IS_ERR(flow)) 692 goto err_kfree_skb; 693 694 err = ovs_flow_extract(packet, -1, &flow->key, &key_len); 695 if (err) 696 goto err_flow_free; 697 698 err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority, 699 &flow->key.phy.skb_mark, 700 &flow->key.phy.in_port, 701 a[OVS_PACKET_ATTR_KEY]); 702 if (err) 703 goto err_flow_free; 704 705 err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0); 706 if (err) 707 goto err_flow_free; 708 709 flow->hash = ovs_flow_hash(&flow->key, key_len); 710 711 acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]); 712 err = PTR_ERR(acts); 713 if (IS_ERR(acts)) 714 goto err_flow_free; 715 rcu_assign_pointer(flow->sf_acts, acts); 716 717 OVS_CB(packet)->flow = flow; 718 packet->priority = flow->key.phy.priority; 719 packet->mark = flow->key.phy.skb_mark; 720 721 rcu_read_lock(); 722 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 723 err = -ENODEV; 724 if (!dp) 725 goto err_unlock; 726 727 local_bh_disable(); 728 err = ovs_execute_actions(dp, packet); 729 local_bh_enable(); 730 rcu_read_unlock(); 731 732 ovs_flow_free(flow); 733 return err; 734 735 err_unlock: 736 rcu_read_unlock(); 737 err_flow_free: 738 ovs_flow_free(flow); 739 err_kfree_skb: 740 kfree_skb(packet); 741 err: 742 return err; 743 } 744 745 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 746 [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC }, 747 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 748 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 749 }; 750 751 static struct genl_ops dp_packet_genl_ops[] = { 752 { .cmd = OVS_PACKET_CMD_EXECUTE, 753 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 754 .policy = packet_policy, 755 .doit = ovs_packet_cmd_execute 756 } 757 }; 758 759 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats) 760 { 761 int i; 762 struct flow_table *table = genl_dereference(dp->table); 763 764 stats->n_flows = ovs_flow_tbl_count(table); 765 766 stats->n_hit = stats->n_missed = stats->n_lost = 0; 767 for_each_possible_cpu(i) { 768 const struct dp_stats_percpu *percpu_stats; 769 struct dp_stats_percpu local_stats; 770 unsigned int start; 771 772 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 773 774 do { 775 start = u64_stats_fetch_begin_bh(&percpu_stats->sync); 776 local_stats = *percpu_stats; 777 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start)); 778 779 stats->n_hit += local_stats.n_hit; 780 stats->n_missed += local_stats.n_missed; 781 stats->n_lost += local_stats.n_lost; 782 } 783 } 784 785 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 786 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 787 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 788 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 789 }; 790 791 static struct genl_family dp_flow_genl_family = { 792 .id = GENL_ID_GENERATE, 793 .hdrsize = sizeof(struct ovs_header), 794 .name = OVS_FLOW_FAMILY, 795 .version = OVS_FLOW_VERSION, 796 .maxattr = OVS_FLOW_ATTR_MAX, 797 .netnsok = true 798 }; 799 800 static struct genl_multicast_group ovs_dp_flow_multicast_group = { 801 .name = OVS_FLOW_MCGROUP 802 }; 803 804 /* Called with genl_lock. */ 805 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp, 806 struct sk_buff *skb, u32 portid, 807 u32 seq, u32 flags, u8 cmd) 808 { 809 const int skb_orig_len = skb->len; 810 const struct sw_flow_actions *sf_acts; 811 struct ovs_flow_stats stats; 812 struct ovs_header *ovs_header; 813 struct nlattr *nla; 814 unsigned long used; 815 u8 tcp_flags; 816 int err; 817 818 sf_acts = rcu_dereference_protected(flow->sf_acts, 819 lockdep_genl_is_held()); 820 821 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd); 822 if (!ovs_header) 823 return -EMSGSIZE; 824 825 ovs_header->dp_ifindex = get_dpifindex(dp); 826 827 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY); 828 if (!nla) 829 goto nla_put_failure; 830 err = ovs_flow_to_nlattrs(&flow->key, skb); 831 if (err) 832 goto error; 833 nla_nest_end(skb, nla); 834 835 spin_lock_bh(&flow->lock); 836 used = flow->used; 837 stats.n_packets = flow->packet_count; 838 stats.n_bytes = flow->byte_count; 839 tcp_flags = flow->tcp_flags; 840 spin_unlock_bh(&flow->lock); 841 842 if (used && 843 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used))) 844 goto nla_put_failure; 845 846 if (stats.n_packets && 847 nla_put(skb, OVS_FLOW_ATTR_STATS, 848 sizeof(struct ovs_flow_stats), &stats)) 849 goto nla_put_failure; 850 851 if (tcp_flags && 852 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags)) 853 goto nla_put_failure; 854 855 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 856 * this is the first flow to be dumped into 'skb'. This is unusual for 857 * Netlink but individual action lists can be longer than 858 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 859 * The userspace caller can always fetch the actions separately if it 860 * really wants them. (Most userspace callers in fact don't care.) 861 * 862 * This can only fail for dump operations because the skb is always 863 * properly sized for single flows. 864 */ 865 err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len, 866 sf_acts->actions); 867 if (err < 0 && skb_orig_len) 868 goto error; 869 870 return genlmsg_end(skb, ovs_header); 871 872 nla_put_failure: 873 err = -EMSGSIZE; 874 error: 875 genlmsg_cancel(skb, ovs_header); 876 return err; 877 } 878 879 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow) 880 { 881 const struct sw_flow_actions *sf_acts; 882 int len; 883 884 sf_acts = rcu_dereference_protected(flow->sf_acts, 885 lockdep_genl_is_held()); 886 887 /* OVS_FLOW_ATTR_KEY */ 888 len = nla_total_size(FLOW_BUFSIZE); 889 /* OVS_FLOW_ATTR_ACTIONS */ 890 len += nla_total_size(sf_acts->actions_len); 891 /* OVS_FLOW_ATTR_STATS */ 892 len += nla_total_size(sizeof(struct ovs_flow_stats)); 893 /* OVS_FLOW_ATTR_TCP_FLAGS */ 894 len += nla_total_size(1); 895 /* OVS_FLOW_ATTR_USED */ 896 len += nla_total_size(8); 897 898 len += NLMSG_ALIGN(sizeof(struct ovs_header)); 899 900 return genlmsg_new(len, GFP_KERNEL); 901 } 902 903 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow, 904 struct datapath *dp, 905 u32 portid, u32 seq, u8 cmd) 906 { 907 struct sk_buff *skb; 908 int retval; 909 910 skb = ovs_flow_cmd_alloc_info(flow); 911 if (!skb) 912 return ERR_PTR(-ENOMEM); 913 914 retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd); 915 BUG_ON(retval < 0); 916 return skb; 917 } 918 919 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info) 920 { 921 struct nlattr **a = info->attrs; 922 struct ovs_header *ovs_header = info->userhdr; 923 struct sw_flow_key key; 924 struct sw_flow *flow; 925 struct sk_buff *reply; 926 struct datapath *dp; 927 struct flow_table *table; 928 int error; 929 int key_len; 930 931 /* Extract key. */ 932 error = -EINVAL; 933 if (!a[OVS_FLOW_ATTR_KEY]) 934 goto error; 935 error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); 936 if (error) 937 goto error; 938 939 /* Validate actions. */ 940 if (a[OVS_FLOW_ATTR_ACTIONS]) { 941 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0); 942 if (error) 943 goto error; 944 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) { 945 error = -EINVAL; 946 goto error; 947 } 948 949 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 950 error = -ENODEV; 951 if (!dp) 952 goto error; 953 954 table = genl_dereference(dp->table); 955 flow = ovs_flow_tbl_lookup(table, &key, key_len); 956 if (!flow) { 957 struct sw_flow_actions *acts; 958 959 /* Bail out if we're not allowed to create a new flow. */ 960 error = -ENOENT; 961 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET) 962 goto error; 963 964 /* Expand table, if necessary, to make room. */ 965 if (ovs_flow_tbl_need_to_expand(table)) { 966 struct flow_table *new_table; 967 968 new_table = ovs_flow_tbl_expand(table); 969 if (!IS_ERR(new_table)) { 970 rcu_assign_pointer(dp->table, new_table); 971 ovs_flow_tbl_deferred_destroy(table); 972 table = genl_dereference(dp->table); 973 } 974 } 975 976 /* Allocate flow. */ 977 flow = ovs_flow_alloc(); 978 if (IS_ERR(flow)) { 979 error = PTR_ERR(flow); 980 goto error; 981 } 982 flow->key = key; 983 clear_stats(flow); 984 985 /* Obtain actions. */ 986 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]); 987 error = PTR_ERR(acts); 988 if (IS_ERR(acts)) 989 goto error_free_flow; 990 rcu_assign_pointer(flow->sf_acts, acts); 991 992 /* Put flow in bucket. */ 993 flow->hash = ovs_flow_hash(&key, key_len); 994 ovs_flow_tbl_insert(table, flow); 995 996 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, 997 info->snd_seq, 998 OVS_FLOW_CMD_NEW); 999 } else { 1000 /* We found a matching flow. */ 1001 struct sw_flow_actions *old_acts; 1002 struct nlattr *acts_attrs; 1003 1004 /* Bail out if we're not allowed to modify an existing flow. 1005 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 1006 * because Generic Netlink treats the latter as a dump 1007 * request. We also accept NLM_F_EXCL in case that bug ever 1008 * gets fixed. 1009 */ 1010 error = -EEXIST; 1011 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW && 1012 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL)) 1013 goto error; 1014 1015 /* Update actions. */ 1016 old_acts = rcu_dereference_protected(flow->sf_acts, 1017 lockdep_genl_is_held()); 1018 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS]; 1019 if (acts_attrs && 1020 (old_acts->actions_len != nla_len(acts_attrs) || 1021 memcmp(old_acts->actions, nla_data(acts_attrs), 1022 old_acts->actions_len))) { 1023 struct sw_flow_actions *new_acts; 1024 1025 new_acts = ovs_flow_actions_alloc(acts_attrs); 1026 error = PTR_ERR(new_acts); 1027 if (IS_ERR(new_acts)) 1028 goto error; 1029 1030 rcu_assign_pointer(flow->sf_acts, new_acts); 1031 ovs_flow_deferred_free_acts(old_acts); 1032 } 1033 1034 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, 1035 info->snd_seq, OVS_FLOW_CMD_NEW); 1036 1037 /* Clear stats. */ 1038 if (a[OVS_FLOW_ATTR_CLEAR]) { 1039 spin_lock_bh(&flow->lock); 1040 clear_stats(flow); 1041 spin_unlock_bh(&flow->lock); 1042 } 1043 } 1044 1045 if (!IS_ERR(reply)) 1046 genl_notify(reply, genl_info_net(info), info->snd_portid, 1047 ovs_dp_flow_multicast_group.id, info->nlhdr, 1048 GFP_KERNEL); 1049 else 1050 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 1051 ovs_dp_flow_multicast_group.id, PTR_ERR(reply)); 1052 return 0; 1053 1054 error_free_flow: 1055 ovs_flow_free(flow); 1056 error: 1057 return error; 1058 } 1059 1060 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1061 { 1062 struct nlattr **a = info->attrs; 1063 struct ovs_header *ovs_header = info->userhdr; 1064 struct sw_flow_key key; 1065 struct sk_buff *reply; 1066 struct sw_flow *flow; 1067 struct datapath *dp; 1068 struct flow_table *table; 1069 int err; 1070 int key_len; 1071 1072 if (!a[OVS_FLOW_ATTR_KEY]) 1073 return -EINVAL; 1074 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); 1075 if (err) 1076 return err; 1077 1078 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1079 if (!dp) 1080 return -ENODEV; 1081 1082 table = genl_dereference(dp->table); 1083 flow = ovs_flow_tbl_lookup(table, &key, key_len); 1084 if (!flow) 1085 return -ENOENT; 1086 1087 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, 1088 info->snd_seq, OVS_FLOW_CMD_NEW); 1089 if (IS_ERR(reply)) 1090 return PTR_ERR(reply); 1091 1092 return genlmsg_reply(reply, info); 1093 } 1094 1095 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1096 { 1097 struct nlattr **a = info->attrs; 1098 struct ovs_header *ovs_header = info->userhdr; 1099 struct sw_flow_key key; 1100 struct sk_buff *reply; 1101 struct sw_flow *flow; 1102 struct datapath *dp; 1103 struct flow_table *table; 1104 int err; 1105 int key_len; 1106 1107 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1108 if (!dp) 1109 return -ENODEV; 1110 1111 if (!a[OVS_FLOW_ATTR_KEY]) 1112 return flush_flows(dp); 1113 1114 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); 1115 if (err) 1116 return err; 1117 1118 table = genl_dereference(dp->table); 1119 flow = ovs_flow_tbl_lookup(table, &key, key_len); 1120 if (!flow) 1121 return -ENOENT; 1122 1123 reply = ovs_flow_cmd_alloc_info(flow); 1124 if (!reply) 1125 return -ENOMEM; 1126 1127 ovs_flow_tbl_remove(table, flow); 1128 1129 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid, 1130 info->snd_seq, 0, OVS_FLOW_CMD_DEL); 1131 BUG_ON(err < 0); 1132 1133 ovs_flow_deferred_free(flow); 1134 1135 genl_notify(reply, genl_info_net(info), info->snd_portid, 1136 ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL); 1137 return 0; 1138 } 1139 1140 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1141 { 1142 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1143 struct datapath *dp; 1144 struct flow_table *table; 1145 1146 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1147 if (!dp) 1148 return -ENODEV; 1149 1150 table = genl_dereference(dp->table); 1151 1152 for (;;) { 1153 struct sw_flow *flow; 1154 u32 bucket, obj; 1155 1156 bucket = cb->args[0]; 1157 obj = cb->args[1]; 1158 flow = ovs_flow_tbl_next(table, &bucket, &obj); 1159 if (!flow) 1160 break; 1161 1162 if (ovs_flow_cmd_fill_info(flow, dp, skb, 1163 NETLINK_CB(cb->skb).portid, 1164 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1165 OVS_FLOW_CMD_NEW) < 0) 1166 break; 1167 1168 cb->args[0] = bucket; 1169 cb->args[1] = obj; 1170 } 1171 return skb->len; 1172 } 1173 1174 static struct genl_ops dp_flow_genl_ops[] = { 1175 { .cmd = OVS_FLOW_CMD_NEW, 1176 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1177 .policy = flow_policy, 1178 .doit = ovs_flow_cmd_new_or_set 1179 }, 1180 { .cmd = OVS_FLOW_CMD_DEL, 1181 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1182 .policy = flow_policy, 1183 .doit = ovs_flow_cmd_del 1184 }, 1185 { .cmd = OVS_FLOW_CMD_GET, 1186 .flags = 0, /* OK for unprivileged users. */ 1187 .policy = flow_policy, 1188 .doit = ovs_flow_cmd_get, 1189 .dumpit = ovs_flow_cmd_dump 1190 }, 1191 { .cmd = OVS_FLOW_CMD_SET, 1192 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1193 .policy = flow_policy, 1194 .doit = ovs_flow_cmd_new_or_set, 1195 }, 1196 }; 1197 1198 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1199 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1200 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1201 }; 1202 1203 static struct genl_family dp_datapath_genl_family = { 1204 .id = GENL_ID_GENERATE, 1205 .hdrsize = sizeof(struct ovs_header), 1206 .name = OVS_DATAPATH_FAMILY, 1207 .version = OVS_DATAPATH_VERSION, 1208 .maxattr = OVS_DP_ATTR_MAX, 1209 .netnsok = true 1210 }; 1211 1212 static struct genl_multicast_group ovs_dp_datapath_multicast_group = { 1213 .name = OVS_DATAPATH_MCGROUP 1214 }; 1215 1216 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1217 u32 portid, u32 seq, u32 flags, u8 cmd) 1218 { 1219 struct ovs_header *ovs_header; 1220 struct ovs_dp_stats dp_stats; 1221 int err; 1222 1223 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1224 flags, cmd); 1225 if (!ovs_header) 1226 goto error; 1227 1228 ovs_header->dp_ifindex = get_dpifindex(dp); 1229 1230 rcu_read_lock(); 1231 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1232 rcu_read_unlock(); 1233 if (err) 1234 goto nla_put_failure; 1235 1236 get_dp_stats(dp, &dp_stats); 1237 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats)) 1238 goto nla_put_failure; 1239 1240 return genlmsg_end(skb, ovs_header); 1241 1242 nla_put_failure: 1243 genlmsg_cancel(skb, ovs_header); 1244 error: 1245 return -EMSGSIZE; 1246 } 1247 1248 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid, 1249 u32 seq, u8 cmd) 1250 { 1251 struct sk_buff *skb; 1252 int retval; 1253 1254 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1255 if (!skb) 1256 return ERR_PTR(-ENOMEM); 1257 1258 retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd); 1259 if (retval < 0) { 1260 kfree_skb(skb); 1261 return ERR_PTR(retval); 1262 } 1263 return skb; 1264 } 1265 1266 /* Called with genl_mutex and optionally with RTNL lock also. */ 1267 static struct datapath *lookup_datapath(struct net *net, 1268 struct ovs_header *ovs_header, 1269 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1270 { 1271 struct datapath *dp; 1272 1273 if (!a[OVS_DP_ATTR_NAME]) 1274 dp = get_dp(net, ovs_header->dp_ifindex); 1275 else { 1276 struct vport *vport; 1277 1278 rcu_read_lock(); 1279 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1280 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1281 rcu_read_unlock(); 1282 } 1283 return dp ? dp : ERR_PTR(-ENODEV); 1284 } 1285 1286 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1287 { 1288 struct nlattr **a = info->attrs; 1289 struct vport_parms parms; 1290 struct sk_buff *reply; 1291 struct datapath *dp; 1292 struct vport *vport; 1293 struct ovs_net *ovs_net; 1294 int err, i; 1295 1296 err = -EINVAL; 1297 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1298 goto err; 1299 1300 rtnl_lock(); 1301 1302 err = -ENOMEM; 1303 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1304 if (dp == NULL) 1305 goto err_unlock_rtnl; 1306 1307 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk))); 1308 1309 /* Allocate table. */ 1310 err = -ENOMEM; 1311 rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS)); 1312 if (!dp->table) 1313 goto err_free_dp; 1314 1315 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu); 1316 if (!dp->stats_percpu) { 1317 err = -ENOMEM; 1318 goto err_destroy_table; 1319 } 1320 1321 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head), 1322 GFP_KERNEL); 1323 if (!dp->ports) { 1324 err = -ENOMEM; 1325 goto err_destroy_percpu; 1326 } 1327 1328 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1329 INIT_HLIST_HEAD(&dp->ports[i]); 1330 1331 /* Set up our datapath device. */ 1332 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1333 parms.type = OVS_VPORT_TYPE_INTERNAL; 1334 parms.options = NULL; 1335 parms.dp = dp; 1336 parms.port_no = OVSP_LOCAL; 1337 parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]); 1338 1339 vport = new_vport(&parms); 1340 if (IS_ERR(vport)) { 1341 err = PTR_ERR(vport); 1342 if (err == -EBUSY) 1343 err = -EEXIST; 1344 1345 goto err_destroy_ports_array; 1346 } 1347 1348 reply = ovs_dp_cmd_build_info(dp, info->snd_portid, 1349 info->snd_seq, OVS_DP_CMD_NEW); 1350 err = PTR_ERR(reply); 1351 if (IS_ERR(reply)) 1352 goto err_destroy_local_port; 1353 1354 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1355 list_add_tail(&dp->list_node, &ovs_net->dps); 1356 rtnl_unlock(); 1357 1358 genl_notify(reply, genl_info_net(info), info->snd_portid, 1359 ovs_dp_datapath_multicast_group.id, info->nlhdr, 1360 GFP_KERNEL); 1361 return 0; 1362 1363 err_destroy_local_port: 1364 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL)); 1365 err_destroy_ports_array: 1366 kfree(dp->ports); 1367 err_destroy_percpu: 1368 free_percpu(dp->stats_percpu); 1369 err_destroy_table: 1370 ovs_flow_tbl_destroy(genl_dereference(dp->table)); 1371 err_free_dp: 1372 release_net(ovs_dp_get_net(dp)); 1373 kfree(dp); 1374 err_unlock_rtnl: 1375 rtnl_unlock(); 1376 err: 1377 return err; 1378 } 1379 1380 /* Called with genl_mutex. */ 1381 static void __dp_destroy(struct datapath *dp) 1382 { 1383 int i; 1384 1385 rtnl_lock(); 1386 1387 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1388 struct vport *vport; 1389 struct hlist_node *n; 1390 1391 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1392 if (vport->port_no != OVSP_LOCAL) 1393 ovs_dp_detach_port(vport); 1394 } 1395 1396 list_del(&dp->list_node); 1397 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL)); 1398 1399 /* rtnl_unlock() will wait until all the references to devices that 1400 * are pending unregistration have been dropped. We do it here to 1401 * ensure that any internal devices (which contain DP pointers) are 1402 * fully destroyed before freeing the datapath. 1403 */ 1404 rtnl_unlock(); 1405 1406 call_rcu(&dp->rcu, destroy_dp_rcu); 1407 } 1408 1409 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1410 { 1411 struct sk_buff *reply; 1412 struct datapath *dp; 1413 int err; 1414 1415 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1416 err = PTR_ERR(dp); 1417 if (IS_ERR(dp)) 1418 return err; 1419 1420 reply = ovs_dp_cmd_build_info(dp, info->snd_portid, 1421 info->snd_seq, OVS_DP_CMD_DEL); 1422 err = PTR_ERR(reply); 1423 if (IS_ERR(reply)) 1424 return err; 1425 1426 __dp_destroy(dp); 1427 1428 genl_notify(reply, genl_info_net(info), info->snd_portid, 1429 ovs_dp_datapath_multicast_group.id, info->nlhdr, 1430 GFP_KERNEL); 1431 1432 return 0; 1433 } 1434 1435 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1436 { 1437 struct sk_buff *reply; 1438 struct datapath *dp; 1439 int err; 1440 1441 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1442 if (IS_ERR(dp)) 1443 return PTR_ERR(dp); 1444 1445 reply = ovs_dp_cmd_build_info(dp, info->snd_portid, 1446 info->snd_seq, OVS_DP_CMD_NEW); 1447 if (IS_ERR(reply)) { 1448 err = PTR_ERR(reply); 1449 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 1450 ovs_dp_datapath_multicast_group.id, err); 1451 return 0; 1452 } 1453 1454 genl_notify(reply, genl_info_net(info), info->snd_portid, 1455 ovs_dp_datapath_multicast_group.id, info->nlhdr, 1456 GFP_KERNEL); 1457 1458 return 0; 1459 } 1460 1461 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1462 { 1463 struct sk_buff *reply; 1464 struct datapath *dp; 1465 1466 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1467 if (IS_ERR(dp)) 1468 return PTR_ERR(dp); 1469 1470 reply = ovs_dp_cmd_build_info(dp, info->snd_portid, 1471 info->snd_seq, OVS_DP_CMD_NEW); 1472 if (IS_ERR(reply)) 1473 return PTR_ERR(reply); 1474 1475 return genlmsg_reply(reply, info); 1476 } 1477 1478 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1479 { 1480 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1481 struct datapath *dp; 1482 int skip = cb->args[0]; 1483 int i = 0; 1484 1485 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1486 if (i >= skip && 1487 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1488 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1489 OVS_DP_CMD_NEW) < 0) 1490 break; 1491 i++; 1492 } 1493 1494 cb->args[0] = i; 1495 1496 return skb->len; 1497 } 1498 1499 static struct genl_ops dp_datapath_genl_ops[] = { 1500 { .cmd = OVS_DP_CMD_NEW, 1501 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1502 .policy = datapath_policy, 1503 .doit = ovs_dp_cmd_new 1504 }, 1505 { .cmd = OVS_DP_CMD_DEL, 1506 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1507 .policy = datapath_policy, 1508 .doit = ovs_dp_cmd_del 1509 }, 1510 { .cmd = OVS_DP_CMD_GET, 1511 .flags = 0, /* OK for unprivileged users. */ 1512 .policy = datapath_policy, 1513 .doit = ovs_dp_cmd_get, 1514 .dumpit = ovs_dp_cmd_dump 1515 }, 1516 { .cmd = OVS_DP_CMD_SET, 1517 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1518 .policy = datapath_policy, 1519 .doit = ovs_dp_cmd_set, 1520 }, 1521 }; 1522 1523 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 1524 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1525 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 1526 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 1527 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 1528 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1529 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 1530 }; 1531 1532 static struct genl_family dp_vport_genl_family = { 1533 .id = GENL_ID_GENERATE, 1534 .hdrsize = sizeof(struct ovs_header), 1535 .name = OVS_VPORT_FAMILY, 1536 .version = OVS_VPORT_VERSION, 1537 .maxattr = OVS_VPORT_ATTR_MAX, 1538 .netnsok = true 1539 }; 1540 1541 struct genl_multicast_group ovs_dp_vport_multicast_group = { 1542 .name = OVS_VPORT_MCGROUP 1543 }; 1544 1545 /* Called with RTNL lock or RCU read lock. */ 1546 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1547 u32 portid, u32 seq, u32 flags, u8 cmd) 1548 { 1549 struct ovs_header *ovs_header; 1550 struct ovs_vport_stats vport_stats; 1551 int err; 1552 1553 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1554 flags, cmd); 1555 if (!ovs_header) 1556 return -EMSGSIZE; 1557 1558 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1559 1560 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1561 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1562 nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) || 1563 nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid)) 1564 goto nla_put_failure; 1565 1566 ovs_vport_get_stats(vport, &vport_stats); 1567 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), 1568 &vport_stats)) 1569 goto nla_put_failure; 1570 1571 err = ovs_vport_get_options(vport, skb); 1572 if (err == -EMSGSIZE) 1573 goto error; 1574 1575 return genlmsg_end(skb, ovs_header); 1576 1577 nla_put_failure: 1578 err = -EMSGSIZE; 1579 error: 1580 genlmsg_cancel(skb, ovs_header); 1581 return err; 1582 } 1583 1584 /* Called with RTNL lock or RCU read lock. */ 1585 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid, 1586 u32 seq, u8 cmd) 1587 { 1588 struct sk_buff *skb; 1589 int retval; 1590 1591 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1592 if (!skb) 1593 return ERR_PTR(-ENOMEM); 1594 1595 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd); 1596 BUG_ON(retval < 0); 1597 1598 return skb; 1599 } 1600 1601 /* Called with RTNL lock or RCU read lock. */ 1602 static struct vport *lookup_vport(struct net *net, 1603 struct ovs_header *ovs_header, 1604 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1605 { 1606 struct datapath *dp; 1607 struct vport *vport; 1608 1609 if (a[OVS_VPORT_ATTR_NAME]) { 1610 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 1611 if (!vport) 1612 return ERR_PTR(-ENODEV); 1613 if (ovs_header->dp_ifindex && 1614 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 1615 return ERR_PTR(-ENODEV); 1616 return vport; 1617 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 1618 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1619 1620 if (port_no >= DP_MAX_PORTS) 1621 return ERR_PTR(-EFBIG); 1622 1623 dp = get_dp(net, ovs_header->dp_ifindex); 1624 if (!dp) 1625 return ERR_PTR(-ENODEV); 1626 1627 vport = ovs_vport_rtnl_rcu(dp, port_no); 1628 if (!vport) 1629 return ERR_PTR(-ENOENT); 1630 return vport; 1631 } else 1632 return ERR_PTR(-EINVAL); 1633 } 1634 1635 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 1636 { 1637 struct nlattr **a = info->attrs; 1638 struct ovs_header *ovs_header = info->userhdr; 1639 struct vport_parms parms; 1640 struct sk_buff *reply; 1641 struct vport *vport; 1642 struct datapath *dp; 1643 u32 port_no; 1644 int err; 1645 1646 err = -EINVAL; 1647 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 1648 !a[OVS_VPORT_ATTR_UPCALL_PID]) 1649 goto exit; 1650 1651 rtnl_lock(); 1652 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1653 err = -ENODEV; 1654 if (!dp) 1655 goto exit_unlock; 1656 1657 if (a[OVS_VPORT_ATTR_PORT_NO]) { 1658 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1659 1660 err = -EFBIG; 1661 if (port_no >= DP_MAX_PORTS) 1662 goto exit_unlock; 1663 1664 vport = ovs_vport_rtnl_rcu(dp, port_no); 1665 err = -EBUSY; 1666 if (vport) 1667 goto exit_unlock; 1668 } else { 1669 for (port_no = 1; ; port_no++) { 1670 if (port_no >= DP_MAX_PORTS) { 1671 err = -EFBIG; 1672 goto exit_unlock; 1673 } 1674 vport = ovs_vport_rtnl(dp, port_no); 1675 if (!vport) 1676 break; 1677 } 1678 } 1679 1680 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 1681 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 1682 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 1683 parms.dp = dp; 1684 parms.port_no = port_no; 1685 parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); 1686 1687 vport = new_vport(&parms); 1688 err = PTR_ERR(vport); 1689 if (IS_ERR(vport)) 1690 goto exit_unlock; 1691 1692 err = 0; 1693 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, 1694 OVS_VPORT_CMD_NEW); 1695 if (IS_ERR(reply)) { 1696 err = PTR_ERR(reply); 1697 ovs_dp_detach_port(vport); 1698 goto exit_unlock; 1699 } 1700 genl_notify(reply, genl_info_net(info), info->snd_portid, 1701 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); 1702 1703 exit_unlock: 1704 rtnl_unlock(); 1705 exit: 1706 return err; 1707 } 1708 1709 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 1710 { 1711 struct nlattr **a = info->attrs; 1712 struct sk_buff *reply; 1713 struct vport *vport; 1714 int err; 1715 1716 rtnl_lock(); 1717 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1718 err = PTR_ERR(vport); 1719 if (IS_ERR(vport)) 1720 goto exit_unlock; 1721 1722 err = 0; 1723 if (a[OVS_VPORT_ATTR_TYPE] && 1724 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) 1725 err = -EINVAL; 1726 1727 reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1728 if (!reply) { 1729 err = -ENOMEM; 1730 goto exit_unlock; 1731 } 1732 1733 if (!err && a[OVS_VPORT_ATTR_OPTIONS]) 1734 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 1735 if (err) 1736 goto exit_free; 1737 1738 if (a[OVS_VPORT_ATTR_UPCALL_PID]) 1739 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); 1740 1741 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 1742 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 1743 BUG_ON(err < 0); 1744 1745 genl_notify(reply, genl_info_net(info), info->snd_portid, 1746 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); 1747 1748 rtnl_unlock(); 1749 return 0; 1750 1751 exit_free: 1752 kfree_skb(reply); 1753 exit_unlock: 1754 rtnl_unlock(); 1755 return err; 1756 } 1757 1758 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 1759 { 1760 struct nlattr **a = info->attrs; 1761 struct sk_buff *reply; 1762 struct vport *vport; 1763 int err; 1764 1765 rtnl_lock(); 1766 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1767 err = PTR_ERR(vport); 1768 if (IS_ERR(vport)) 1769 goto exit_unlock; 1770 1771 if (vport->port_no == OVSP_LOCAL) { 1772 err = -EINVAL; 1773 goto exit_unlock; 1774 } 1775 1776 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, 1777 OVS_VPORT_CMD_DEL); 1778 err = PTR_ERR(reply); 1779 if (IS_ERR(reply)) 1780 goto exit_unlock; 1781 1782 err = 0; 1783 ovs_dp_detach_port(vport); 1784 1785 genl_notify(reply, genl_info_net(info), info->snd_portid, 1786 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); 1787 1788 exit_unlock: 1789 rtnl_unlock(); 1790 return err; 1791 } 1792 1793 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 1794 { 1795 struct nlattr **a = info->attrs; 1796 struct ovs_header *ovs_header = info->userhdr; 1797 struct sk_buff *reply; 1798 struct vport *vport; 1799 int err; 1800 1801 rcu_read_lock(); 1802 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 1803 err = PTR_ERR(vport); 1804 if (IS_ERR(vport)) 1805 goto exit_unlock; 1806 1807 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, 1808 OVS_VPORT_CMD_NEW); 1809 err = PTR_ERR(reply); 1810 if (IS_ERR(reply)) 1811 goto exit_unlock; 1812 1813 rcu_read_unlock(); 1814 1815 return genlmsg_reply(reply, info); 1816 1817 exit_unlock: 1818 rcu_read_unlock(); 1819 return err; 1820 } 1821 1822 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1823 { 1824 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1825 struct datapath *dp; 1826 int bucket = cb->args[0], skip = cb->args[1]; 1827 int i, j = 0; 1828 1829 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1830 if (!dp) 1831 return -ENODEV; 1832 1833 rcu_read_lock(); 1834 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 1835 struct vport *vport; 1836 1837 j = 0; 1838 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 1839 if (j >= skip && 1840 ovs_vport_cmd_fill_info(vport, skb, 1841 NETLINK_CB(cb->skb).portid, 1842 cb->nlh->nlmsg_seq, 1843 NLM_F_MULTI, 1844 OVS_VPORT_CMD_NEW) < 0) 1845 goto out; 1846 1847 j++; 1848 } 1849 skip = 0; 1850 } 1851 out: 1852 rcu_read_unlock(); 1853 1854 cb->args[0] = i; 1855 cb->args[1] = j; 1856 1857 return skb->len; 1858 } 1859 1860 static struct genl_ops dp_vport_genl_ops[] = { 1861 { .cmd = OVS_VPORT_CMD_NEW, 1862 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1863 .policy = vport_policy, 1864 .doit = ovs_vport_cmd_new 1865 }, 1866 { .cmd = OVS_VPORT_CMD_DEL, 1867 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1868 .policy = vport_policy, 1869 .doit = ovs_vport_cmd_del 1870 }, 1871 { .cmd = OVS_VPORT_CMD_GET, 1872 .flags = 0, /* OK for unprivileged users. */ 1873 .policy = vport_policy, 1874 .doit = ovs_vport_cmd_get, 1875 .dumpit = ovs_vport_cmd_dump 1876 }, 1877 { .cmd = OVS_VPORT_CMD_SET, 1878 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1879 .policy = vport_policy, 1880 .doit = ovs_vport_cmd_set, 1881 }, 1882 }; 1883 1884 struct genl_family_and_ops { 1885 struct genl_family *family; 1886 struct genl_ops *ops; 1887 int n_ops; 1888 struct genl_multicast_group *group; 1889 }; 1890 1891 static const struct genl_family_and_ops dp_genl_families[] = { 1892 { &dp_datapath_genl_family, 1893 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops), 1894 &ovs_dp_datapath_multicast_group }, 1895 { &dp_vport_genl_family, 1896 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops), 1897 &ovs_dp_vport_multicast_group }, 1898 { &dp_flow_genl_family, 1899 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops), 1900 &ovs_dp_flow_multicast_group }, 1901 { &dp_packet_genl_family, 1902 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops), 1903 NULL }, 1904 }; 1905 1906 static void dp_unregister_genl(int n_families) 1907 { 1908 int i; 1909 1910 for (i = 0; i < n_families; i++) 1911 genl_unregister_family(dp_genl_families[i].family); 1912 } 1913 1914 static int dp_register_genl(void) 1915 { 1916 int n_registered; 1917 int err; 1918 int i; 1919 1920 n_registered = 0; 1921 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 1922 const struct genl_family_and_ops *f = &dp_genl_families[i]; 1923 1924 err = genl_register_family_with_ops(f->family, f->ops, 1925 f->n_ops); 1926 if (err) 1927 goto error; 1928 n_registered++; 1929 1930 if (f->group) { 1931 err = genl_register_mc_group(f->family, f->group); 1932 if (err) 1933 goto error; 1934 } 1935 } 1936 1937 return 0; 1938 1939 error: 1940 dp_unregister_genl(n_registered); 1941 return err; 1942 } 1943 1944 static void rehash_flow_table(struct work_struct *work) 1945 { 1946 struct datapath *dp; 1947 struct net *net; 1948 1949 genl_lock(); 1950 rtnl_lock(); 1951 for_each_net(net) { 1952 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1953 1954 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1955 struct flow_table *old_table = genl_dereference(dp->table); 1956 struct flow_table *new_table; 1957 1958 new_table = ovs_flow_tbl_rehash(old_table); 1959 if (!IS_ERR(new_table)) { 1960 rcu_assign_pointer(dp->table, new_table); 1961 ovs_flow_tbl_deferred_destroy(old_table); 1962 } 1963 } 1964 } 1965 rtnl_unlock(); 1966 genl_unlock(); 1967 1968 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); 1969 } 1970 1971 static int __net_init ovs_init_net(struct net *net) 1972 { 1973 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1974 1975 INIT_LIST_HEAD(&ovs_net->dps); 1976 return 0; 1977 } 1978 1979 static void __net_exit ovs_exit_net(struct net *net) 1980 { 1981 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1982 struct datapath *dp, *dp_next; 1983 1984 genl_lock(); 1985 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 1986 __dp_destroy(dp); 1987 genl_unlock(); 1988 } 1989 1990 static struct pernet_operations ovs_net_ops = { 1991 .init = ovs_init_net, 1992 .exit = ovs_exit_net, 1993 .id = &ovs_net_id, 1994 .size = sizeof(struct ovs_net), 1995 }; 1996 1997 static int __init dp_init(void) 1998 { 1999 int err; 2000 2001 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); 2002 2003 pr_info("Open vSwitch switching datapath\n"); 2004 2005 err = ovs_flow_init(); 2006 if (err) 2007 goto error; 2008 2009 err = ovs_vport_init(); 2010 if (err) 2011 goto error_flow_exit; 2012 2013 err = register_pernet_device(&ovs_net_ops); 2014 if (err) 2015 goto error_vport_exit; 2016 2017 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2018 if (err) 2019 goto error_netns_exit; 2020 2021 err = dp_register_genl(); 2022 if (err < 0) 2023 goto error_unreg_notifier; 2024 2025 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); 2026 2027 return 0; 2028 2029 error_unreg_notifier: 2030 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2031 error_netns_exit: 2032 unregister_pernet_device(&ovs_net_ops); 2033 error_vport_exit: 2034 ovs_vport_exit(); 2035 error_flow_exit: 2036 ovs_flow_exit(); 2037 error: 2038 return err; 2039 } 2040 2041 static void dp_cleanup(void) 2042 { 2043 cancel_delayed_work_sync(&rehash_flow_wq); 2044 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2045 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2046 unregister_pernet_device(&ovs_net_ops); 2047 rcu_barrier(); 2048 ovs_vport_exit(); 2049 ovs_flow_exit(); 2050 } 2051 2052 module_init(dp_init); 2053 module_exit(dp_cleanup); 2054 2055 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2056 MODULE_LICENSE("GPL"); 2057