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->userdata) 373 len += NLA_ALIGN(upcall_info->userdata->nla_len); 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(user_skb, OVS_PACKET_ATTR_USERDATA, 391 nla_len(upcall_info->userdata), 392 nla_data(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 genlmsg_end(user_skb, upcall); 399 err = genlmsg_unicast(net, user_skb, upcall_info->portid); 400 401 out: 402 kfree_skb(nskb); 403 return err; 404 } 405 406 /* Called with genl_mutex. */ 407 static int flush_flows(struct datapath *dp) 408 { 409 struct flow_table *old_table; 410 struct flow_table *new_table; 411 412 old_table = genl_dereference(dp->table); 413 new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS); 414 if (!new_table) 415 return -ENOMEM; 416 417 rcu_assign_pointer(dp->table, new_table); 418 419 ovs_flow_tbl_deferred_destroy(old_table); 420 return 0; 421 } 422 423 static int validate_actions(const struct nlattr *attr, 424 const struct sw_flow_key *key, int depth); 425 426 static int validate_sample(const struct nlattr *attr, 427 const struct sw_flow_key *key, int depth) 428 { 429 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1]; 430 const struct nlattr *probability, *actions; 431 const struct nlattr *a; 432 int rem; 433 434 memset(attrs, 0, sizeof(attrs)); 435 nla_for_each_nested(a, attr, rem) { 436 int type = nla_type(a); 437 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type]) 438 return -EINVAL; 439 attrs[type] = a; 440 } 441 if (rem) 442 return -EINVAL; 443 444 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY]; 445 if (!probability || nla_len(probability) != sizeof(u32)) 446 return -EINVAL; 447 448 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS]; 449 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN)) 450 return -EINVAL; 451 return validate_actions(actions, key, depth + 1); 452 } 453 454 static int validate_tp_port(const struct sw_flow_key *flow_key) 455 { 456 if (flow_key->eth.type == htons(ETH_P_IP)) { 457 if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst) 458 return 0; 459 } else if (flow_key->eth.type == htons(ETH_P_IPV6)) { 460 if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst) 461 return 0; 462 } 463 464 return -EINVAL; 465 } 466 467 static int validate_set(const struct nlattr *a, 468 const struct sw_flow_key *flow_key) 469 { 470 const struct nlattr *ovs_key = nla_data(a); 471 int key_type = nla_type(ovs_key); 472 473 /* There can be only one key in a action */ 474 if (nla_total_size(nla_len(ovs_key)) != nla_len(a)) 475 return -EINVAL; 476 477 if (key_type > OVS_KEY_ATTR_MAX || 478 nla_len(ovs_key) != ovs_key_lens[key_type]) 479 return -EINVAL; 480 481 switch (key_type) { 482 const struct ovs_key_ipv4 *ipv4_key; 483 const struct ovs_key_ipv6 *ipv6_key; 484 485 case OVS_KEY_ATTR_PRIORITY: 486 case OVS_KEY_ATTR_SKB_MARK: 487 case OVS_KEY_ATTR_ETHERNET: 488 break; 489 490 case OVS_KEY_ATTR_IPV4: 491 if (flow_key->eth.type != htons(ETH_P_IP)) 492 return -EINVAL; 493 494 if (!flow_key->ip.proto) 495 return -EINVAL; 496 497 ipv4_key = nla_data(ovs_key); 498 if (ipv4_key->ipv4_proto != flow_key->ip.proto) 499 return -EINVAL; 500 501 if (ipv4_key->ipv4_frag != flow_key->ip.frag) 502 return -EINVAL; 503 504 break; 505 506 case OVS_KEY_ATTR_IPV6: 507 if (flow_key->eth.type != htons(ETH_P_IPV6)) 508 return -EINVAL; 509 510 if (!flow_key->ip.proto) 511 return -EINVAL; 512 513 ipv6_key = nla_data(ovs_key); 514 if (ipv6_key->ipv6_proto != flow_key->ip.proto) 515 return -EINVAL; 516 517 if (ipv6_key->ipv6_frag != flow_key->ip.frag) 518 return -EINVAL; 519 520 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000) 521 return -EINVAL; 522 523 break; 524 525 case OVS_KEY_ATTR_TCP: 526 if (flow_key->ip.proto != IPPROTO_TCP) 527 return -EINVAL; 528 529 return validate_tp_port(flow_key); 530 531 case OVS_KEY_ATTR_UDP: 532 if (flow_key->ip.proto != IPPROTO_UDP) 533 return -EINVAL; 534 535 return validate_tp_port(flow_key); 536 537 default: 538 return -EINVAL; 539 } 540 541 return 0; 542 } 543 544 static int validate_userspace(const struct nlattr *attr) 545 { 546 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = { 547 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 }, 548 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC }, 549 }; 550 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1]; 551 int error; 552 553 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX, 554 attr, userspace_policy); 555 if (error) 556 return error; 557 558 if (!a[OVS_USERSPACE_ATTR_PID] || 559 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID])) 560 return -EINVAL; 561 562 return 0; 563 } 564 565 static int validate_actions(const struct nlattr *attr, 566 const struct sw_flow_key *key, int depth) 567 { 568 const struct nlattr *a; 569 int rem, err; 570 571 if (depth >= SAMPLE_ACTION_DEPTH) 572 return -EOVERFLOW; 573 574 nla_for_each_nested(a, attr, rem) { 575 /* Expected argument lengths, (u32)-1 for variable length. */ 576 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = { 577 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32), 578 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1, 579 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan), 580 [OVS_ACTION_ATTR_POP_VLAN] = 0, 581 [OVS_ACTION_ATTR_SET] = (u32)-1, 582 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1 583 }; 584 const struct ovs_action_push_vlan *vlan; 585 int type = nla_type(a); 586 587 if (type > OVS_ACTION_ATTR_MAX || 588 (action_lens[type] != nla_len(a) && 589 action_lens[type] != (u32)-1)) 590 return -EINVAL; 591 592 switch (type) { 593 case OVS_ACTION_ATTR_UNSPEC: 594 return -EINVAL; 595 596 case OVS_ACTION_ATTR_USERSPACE: 597 err = validate_userspace(a); 598 if (err) 599 return err; 600 break; 601 602 case OVS_ACTION_ATTR_OUTPUT: 603 if (nla_get_u32(a) >= DP_MAX_PORTS) 604 return -EINVAL; 605 break; 606 607 608 case OVS_ACTION_ATTR_POP_VLAN: 609 break; 610 611 case OVS_ACTION_ATTR_PUSH_VLAN: 612 vlan = nla_data(a); 613 if (vlan->vlan_tpid != htons(ETH_P_8021Q)) 614 return -EINVAL; 615 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT))) 616 return -EINVAL; 617 break; 618 619 case OVS_ACTION_ATTR_SET: 620 err = validate_set(a, key); 621 if (err) 622 return err; 623 break; 624 625 case OVS_ACTION_ATTR_SAMPLE: 626 err = validate_sample(a, key, depth); 627 if (err) 628 return err; 629 break; 630 631 default: 632 return -EINVAL; 633 } 634 } 635 636 if (rem > 0) 637 return -EINVAL; 638 639 return 0; 640 } 641 642 static void clear_stats(struct sw_flow *flow) 643 { 644 flow->used = 0; 645 flow->tcp_flags = 0; 646 flow->packet_count = 0; 647 flow->byte_count = 0; 648 } 649 650 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 651 { 652 struct ovs_header *ovs_header = info->userhdr; 653 struct nlattr **a = info->attrs; 654 struct sw_flow_actions *acts; 655 struct sk_buff *packet; 656 struct sw_flow *flow; 657 struct datapath *dp; 658 struct ethhdr *eth; 659 int len; 660 int err; 661 int key_len; 662 663 err = -EINVAL; 664 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 665 !a[OVS_PACKET_ATTR_ACTIONS] || 666 nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN) 667 goto err; 668 669 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 670 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 671 err = -ENOMEM; 672 if (!packet) 673 goto err; 674 skb_reserve(packet, NET_IP_ALIGN); 675 676 memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len); 677 678 skb_reset_mac_header(packet); 679 eth = eth_hdr(packet); 680 681 /* Normally, setting the skb 'protocol' field would be handled by a 682 * call to eth_type_trans(), but it assumes there's a sending 683 * device, which we may not have. */ 684 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) 685 packet->protocol = eth->h_proto; 686 else 687 packet->protocol = htons(ETH_P_802_2); 688 689 /* Build an sw_flow for sending this packet. */ 690 flow = ovs_flow_alloc(); 691 err = PTR_ERR(flow); 692 if (IS_ERR(flow)) 693 goto err_kfree_skb; 694 695 err = ovs_flow_extract(packet, -1, &flow->key, &key_len); 696 if (err) 697 goto err_flow_free; 698 699 err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority, 700 &flow->key.phy.skb_mark, 701 &flow->key.phy.in_port, 702 a[OVS_PACKET_ATTR_KEY]); 703 if (err) 704 goto err_flow_free; 705 706 err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0); 707 if (err) 708 goto err_flow_free; 709 710 flow->hash = ovs_flow_hash(&flow->key, key_len); 711 712 acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]); 713 err = PTR_ERR(acts); 714 if (IS_ERR(acts)) 715 goto err_flow_free; 716 rcu_assign_pointer(flow->sf_acts, acts); 717 718 OVS_CB(packet)->flow = flow; 719 packet->priority = flow->key.phy.priority; 720 packet->mark = flow->key.phy.skb_mark; 721 722 rcu_read_lock(); 723 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 724 err = -ENODEV; 725 if (!dp) 726 goto err_unlock; 727 728 local_bh_disable(); 729 err = ovs_execute_actions(dp, packet); 730 local_bh_enable(); 731 rcu_read_unlock(); 732 733 ovs_flow_free(flow); 734 return err; 735 736 err_unlock: 737 rcu_read_unlock(); 738 err_flow_free: 739 ovs_flow_free(flow); 740 err_kfree_skb: 741 kfree_skb(packet); 742 err: 743 return err; 744 } 745 746 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 747 [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC }, 748 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 749 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 750 }; 751 752 static struct genl_ops dp_packet_genl_ops[] = { 753 { .cmd = OVS_PACKET_CMD_EXECUTE, 754 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 755 .policy = packet_policy, 756 .doit = ovs_packet_cmd_execute 757 } 758 }; 759 760 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats) 761 { 762 int i; 763 struct flow_table *table = genl_dereference(dp->table); 764 765 stats->n_flows = ovs_flow_tbl_count(table); 766 767 stats->n_hit = stats->n_missed = stats->n_lost = 0; 768 for_each_possible_cpu(i) { 769 const struct dp_stats_percpu *percpu_stats; 770 struct dp_stats_percpu local_stats; 771 unsigned int start; 772 773 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 774 775 do { 776 start = u64_stats_fetch_begin_bh(&percpu_stats->sync); 777 local_stats = *percpu_stats; 778 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start)); 779 780 stats->n_hit += local_stats.n_hit; 781 stats->n_missed += local_stats.n_missed; 782 stats->n_lost += local_stats.n_lost; 783 } 784 } 785 786 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 787 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 788 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 789 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 790 }; 791 792 static struct genl_family dp_flow_genl_family = { 793 .id = GENL_ID_GENERATE, 794 .hdrsize = sizeof(struct ovs_header), 795 .name = OVS_FLOW_FAMILY, 796 .version = OVS_FLOW_VERSION, 797 .maxattr = OVS_FLOW_ATTR_MAX, 798 .netnsok = true 799 }; 800 801 static struct genl_multicast_group ovs_dp_flow_multicast_group = { 802 .name = OVS_FLOW_MCGROUP 803 }; 804 805 /* Called with genl_lock. */ 806 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp, 807 struct sk_buff *skb, u32 portid, 808 u32 seq, u32 flags, u8 cmd) 809 { 810 const int skb_orig_len = skb->len; 811 const struct sw_flow_actions *sf_acts; 812 struct ovs_flow_stats stats; 813 struct ovs_header *ovs_header; 814 struct nlattr *nla; 815 unsigned long used; 816 u8 tcp_flags; 817 int err; 818 819 sf_acts = rcu_dereference_protected(flow->sf_acts, 820 lockdep_genl_is_held()); 821 822 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd); 823 if (!ovs_header) 824 return -EMSGSIZE; 825 826 ovs_header->dp_ifindex = get_dpifindex(dp); 827 828 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY); 829 if (!nla) 830 goto nla_put_failure; 831 err = ovs_flow_to_nlattrs(&flow->key, skb); 832 if (err) 833 goto error; 834 nla_nest_end(skb, nla); 835 836 spin_lock_bh(&flow->lock); 837 used = flow->used; 838 stats.n_packets = flow->packet_count; 839 stats.n_bytes = flow->byte_count; 840 tcp_flags = flow->tcp_flags; 841 spin_unlock_bh(&flow->lock); 842 843 if (used && 844 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used))) 845 goto nla_put_failure; 846 847 if (stats.n_packets && 848 nla_put(skb, OVS_FLOW_ATTR_STATS, 849 sizeof(struct ovs_flow_stats), &stats)) 850 goto nla_put_failure; 851 852 if (tcp_flags && 853 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags)) 854 goto nla_put_failure; 855 856 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 857 * this is the first flow to be dumped into 'skb'. This is unusual for 858 * Netlink but individual action lists can be longer than 859 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 860 * The userspace caller can always fetch the actions separately if it 861 * really wants them. (Most userspace callers in fact don't care.) 862 * 863 * This can only fail for dump operations because the skb is always 864 * properly sized for single flows. 865 */ 866 err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len, 867 sf_acts->actions); 868 if (err < 0 && skb_orig_len) 869 goto error; 870 871 return genlmsg_end(skb, ovs_header); 872 873 nla_put_failure: 874 err = -EMSGSIZE; 875 error: 876 genlmsg_cancel(skb, ovs_header); 877 return err; 878 } 879 880 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow) 881 { 882 const struct sw_flow_actions *sf_acts; 883 int len; 884 885 sf_acts = rcu_dereference_protected(flow->sf_acts, 886 lockdep_genl_is_held()); 887 888 /* OVS_FLOW_ATTR_KEY */ 889 len = nla_total_size(FLOW_BUFSIZE); 890 /* OVS_FLOW_ATTR_ACTIONS */ 891 len += nla_total_size(sf_acts->actions_len); 892 /* OVS_FLOW_ATTR_STATS */ 893 len += nla_total_size(sizeof(struct ovs_flow_stats)); 894 /* OVS_FLOW_ATTR_TCP_FLAGS */ 895 len += nla_total_size(1); 896 /* OVS_FLOW_ATTR_USED */ 897 len += nla_total_size(8); 898 899 len += NLMSG_ALIGN(sizeof(struct ovs_header)); 900 901 return genlmsg_new(len, GFP_KERNEL); 902 } 903 904 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow, 905 struct datapath *dp, 906 u32 portid, u32 seq, u8 cmd) 907 { 908 struct sk_buff *skb; 909 int retval; 910 911 skb = ovs_flow_cmd_alloc_info(flow); 912 if (!skb) 913 return ERR_PTR(-ENOMEM); 914 915 retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd); 916 BUG_ON(retval < 0); 917 return skb; 918 } 919 920 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info) 921 { 922 struct nlattr **a = info->attrs; 923 struct ovs_header *ovs_header = info->userhdr; 924 struct sw_flow_key key; 925 struct sw_flow *flow; 926 struct sk_buff *reply; 927 struct datapath *dp; 928 struct flow_table *table; 929 int error; 930 int key_len; 931 932 /* Extract key. */ 933 error = -EINVAL; 934 if (!a[OVS_FLOW_ATTR_KEY]) 935 goto error; 936 error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); 937 if (error) 938 goto error; 939 940 /* Validate actions. */ 941 if (a[OVS_FLOW_ATTR_ACTIONS]) { 942 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0); 943 if (error) 944 goto error; 945 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) { 946 error = -EINVAL; 947 goto error; 948 } 949 950 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 951 error = -ENODEV; 952 if (!dp) 953 goto error; 954 955 table = genl_dereference(dp->table); 956 flow = ovs_flow_tbl_lookup(table, &key, key_len); 957 if (!flow) { 958 struct sw_flow_actions *acts; 959 960 /* Bail out if we're not allowed to create a new flow. */ 961 error = -ENOENT; 962 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET) 963 goto error; 964 965 /* Expand table, if necessary, to make room. */ 966 if (ovs_flow_tbl_need_to_expand(table)) { 967 struct flow_table *new_table; 968 969 new_table = ovs_flow_tbl_expand(table); 970 if (!IS_ERR(new_table)) { 971 rcu_assign_pointer(dp->table, new_table); 972 ovs_flow_tbl_deferred_destroy(table); 973 table = genl_dereference(dp->table); 974 } 975 } 976 977 /* Allocate flow. */ 978 flow = ovs_flow_alloc(); 979 if (IS_ERR(flow)) { 980 error = PTR_ERR(flow); 981 goto error; 982 } 983 flow->key = key; 984 clear_stats(flow); 985 986 /* Obtain actions. */ 987 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]); 988 error = PTR_ERR(acts); 989 if (IS_ERR(acts)) 990 goto error_free_flow; 991 rcu_assign_pointer(flow->sf_acts, acts); 992 993 /* Put flow in bucket. */ 994 flow->hash = ovs_flow_hash(&key, key_len); 995 ovs_flow_tbl_insert(table, flow); 996 997 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, 998 info->snd_seq, 999 OVS_FLOW_CMD_NEW); 1000 } else { 1001 /* We found a matching flow. */ 1002 struct sw_flow_actions *old_acts; 1003 struct nlattr *acts_attrs; 1004 1005 /* Bail out if we're not allowed to modify an existing flow. 1006 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 1007 * because Generic Netlink treats the latter as a dump 1008 * request. We also accept NLM_F_EXCL in case that bug ever 1009 * gets fixed. 1010 */ 1011 error = -EEXIST; 1012 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW && 1013 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL)) 1014 goto error; 1015 1016 /* Update actions. */ 1017 old_acts = rcu_dereference_protected(flow->sf_acts, 1018 lockdep_genl_is_held()); 1019 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS]; 1020 if (acts_attrs && 1021 (old_acts->actions_len != nla_len(acts_attrs) || 1022 memcmp(old_acts->actions, nla_data(acts_attrs), 1023 old_acts->actions_len))) { 1024 struct sw_flow_actions *new_acts; 1025 1026 new_acts = ovs_flow_actions_alloc(acts_attrs); 1027 error = PTR_ERR(new_acts); 1028 if (IS_ERR(new_acts)) 1029 goto error; 1030 1031 rcu_assign_pointer(flow->sf_acts, new_acts); 1032 ovs_flow_deferred_free_acts(old_acts); 1033 } 1034 1035 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, 1036 info->snd_seq, OVS_FLOW_CMD_NEW); 1037 1038 /* Clear stats. */ 1039 if (a[OVS_FLOW_ATTR_CLEAR]) { 1040 spin_lock_bh(&flow->lock); 1041 clear_stats(flow); 1042 spin_unlock_bh(&flow->lock); 1043 } 1044 } 1045 1046 if (!IS_ERR(reply)) 1047 genl_notify(reply, genl_info_net(info), info->snd_portid, 1048 ovs_dp_flow_multicast_group.id, info->nlhdr, 1049 GFP_KERNEL); 1050 else 1051 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 1052 ovs_dp_flow_multicast_group.id, PTR_ERR(reply)); 1053 return 0; 1054 1055 error_free_flow: 1056 ovs_flow_free(flow); 1057 error: 1058 return error; 1059 } 1060 1061 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1062 { 1063 struct nlattr **a = info->attrs; 1064 struct ovs_header *ovs_header = info->userhdr; 1065 struct sw_flow_key key; 1066 struct sk_buff *reply; 1067 struct sw_flow *flow; 1068 struct datapath *dp; 1069 struct flow_table *table; 1070 int err; 1071 int key_len; 1072 1073 if (!a[OVS_FLOW_ATTR_KEY]) 1074 return -EINVAL; 1075 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); 1076 if (err) 1077 return err; 1078 1079 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1080 if (!dp) 1081 return -ENODEV; 1082 1083 table = genl_dereference(dp->table); 1084 flow = ovs_flow_tbl_lookup(table, &key, key_len); 1085 if (!flow) 1086 return -ENOENT; 1087 1088 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, 1089 info->snd_seq, OVS_FLOW_CMD_NEW); 1090 if (IS_ERR(reply)) 1091 return PTR_ERR(reply); 1092 1093 return genlmsg_reply(reply, info); 1094 } 1095 1096 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1097 { 1098 struct nlattr **a = info->attrs; 1099 struct ovs_header *ovs_header = info->userhdr; 1100 struct sw_flow_key key; 1101 struct sk_buff *reply; 1102 struct sw_flow *flow; 1103 struct datapath *dp; 1104 struct flow_table *table; 1105 int err; 1106 int key_len; 1107 1108 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1109 if (!dp) 1110 return -ENODEV; 1111 1112 if (!a[OVS_FLOW_ATTR_KEY]) 1113 return flush_flows(dp); 1114 1115 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); 1116 if (err) 1117 return err; 1118 1119 table = genl_dereference(dp->table); 1120 flow = ovs_flow_tbl_lookup(table, &key, key_len); 1121 if (!flow) 1122 return -ENOENT; 1123 1124 reply = ovs_flow_cmd_alloc_info(flow); 1125 if (!reply) 1126 return -ENOMEM; 1127 1128 ovs_flow_tbl_remove(table, flow); 1129 1130 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid, 1131 info->snd_seq, 0, OVS_FLOW_CMD_DEL); 1132 BUG_ON(err < 0); 1133 1134 ovs_flow_deferred_free(flow); 1135 1136 genl_notify(reply, genl_info_net(info), info->snd_portid, 1137 ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL); 1138 return 0; 1139 } 1140 1141 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1142 { 1143 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1144 struct datapath *dp; 1145 struct flow_table *table; 1146 1147 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1148 if (!dp) 1149 return -ENODEV; 1150 1151 table = genl_dereference(dp->table); 1152 1153 for (;;) { 1154 struct sw_flow *flow; 1155 u32 bucket, obj; 1156 1157 bucket = cb->args[0]; 1158 obj = cb->args[1]; 1159 flow = ovs_flow_tbl_next(table, &bucket, &obj); 1160 if (!flow) 1161 break; 1162 1163 if (ovs_flow_cmd_fill_info(flow, dp, skb, 1164 NETLINK_CB(cb->skb).portid, 1165 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1166 OVS_FLOW_CMD_NEW) < 0) 1167 break; 1168 1169 cb->args[0] = bucket; 1170 cb->args[1] = obj; 1171 } 1172 return skb->len; 1173 } 1174 1175 static struct genl_ops dp_flow_genl_ops[] = { 1176 { .cmd = OVS_FLOW_CMD_NEW, 1177 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1178 .policy = flow_policy, 1179 .doit = ovs_flow_cmd_new_or_set 1180 }, 1181 { .cmd = OVS_FLOW_CMD_DEL, 1182 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1183 .policy = flow_policy, 1184 .doit = ovs_flow_cmd_del 1185 }, 1186 { .cmd = OVS_FLOW_CMD_GET, 1187 .flags = 0, /* OK for unprivileged users. */ 1188 .policy = flow_policy, 1189 .doit = ovs_flow_cmd_get, 1190 .dumpit = ovs_flow_cmd_dump 1191 }, 1192 { .cmd = OVS_FLOW_CMD_SET, 1193 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1194 .policy = flow_policy, 1195 .doit = ovs_flow_cmd_new_or_set, 1196 }, 1197 }; 1198 1199 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1200 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1201 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1202 }; 1203 1204 static struct genl_family dp_datapath_genl_family = { 1205 .id = GENL_ID_GENERATE, 1206 .hdrsize = sizeof(struct ovs_header), 1207 .name = OVS_DATAPATH_FAMILY, 1208 .version = OVS_DATAPATH_VERSION, 1209 .maxattr = OVS_DP_ATTR_MAX, 1210 .netnsok = true 1211 }; 1212 1213 static struct genl_multicast_group ovs_dp_datapath_multicast_group = { 1214 .name = OVS_DATAPATH_MCGROUP 1215 }; 1216 1217 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1218 u32 portid, u32 seq, u32 flags, u8 cmd) 1219 { 1220 struct ovs_header *ovs_header; 1221 struct ovs_dp_stats dp_stats; 1222 int err; 1223 1224 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1225 flags, cmd); 1226 if (!ovs_header) 1227 goto error; 1228 1229 ovs_header->dp_ifindex = get_dpifindex(dp); 1230 1231 rcu_read_lock(); 1232 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1233 rcu_read_unlock(); 1234 if (err) 1235 goto nla_put_failure; 1236 1237 get_dp_stats(dp, &dp_stats); 1238 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats)) 1239 goto nla_put_failure; 1240 1241 return genlmsg_end(skb, ovs_header); 1242 1243 nla_put_failure: 1244 genlmsg_cancel(skb, ovs_header); 1245 error: 1246 return -EMSGSIZE; 1247 } 1248 1249 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid, 1250 u32 seq, u8 cmd) 1251 { 1252 struct sk_buff *skb; 1253 int retval; 1254 1255 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1256 if (!skb) 1257 return ERR_PTR(-ENOMEM); 1258 1259 retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd); 1260 if (retval < 0) { 1261 kfree_skb(skb); 1262 return ERR_PTR(retval); 1263 } 1264 return skb; 1265 } 1266 1267 /* Called with genl_mutex and optionally with RTNL lock also. */ 1268 static struct datapath *lookup_datapath(struct net *net, 1269 struct ovs_header *ovs_header, 1270 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1271 { 1272 struct datapath *dp; 1273 1274 if (!a[OVS_DP_ATTR_NAME]) 1275 dp = get_dp(net, ovs_header->dp_ifindex); 1276 else { 1277 struct vport *vport; 1278 1279 rcu_read_lock(); 1280 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1281 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1282 rcu_read_unlock(); 1283 } 1284 return dp ? dp : ERR_PTR(-ENODEV); 1285 } 1286 1287 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1288 { 1289 struct nlattr **a = info->attrs; 1290 struct vport_parms parms; 1291 struct sk_buff *reply; 1292 struct datapath *dp; 1293 struct vport *vport; 1294 struct ovs_net *ovs_net; 1295 int err, i; 1296 1297 err = -EINVAL; 1298 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1299 goto err; 1300 1301 rtnl_lock(); 1302 1303 err = -ENOMEM; 1304 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1305 if (dp == NULL) 1306 goto err_unlock_rtnl; 1307 1308 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk))); 1309 1310 /* Allocate table. */ 1311 err = -ENOMEM; 1312 rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS)); 1313 if (!dp->table) 1314 goto err_free_dp; 1315 1316 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu); 1317 if (!dp->stats_percpu) { 1318 err = -ENOMEM; 1319 goto err_destroy_table; 1320 } 1321 1322 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head), 1323 GFP_KERNEL); 1324 if (!dp->ports) { 1325 err = -ENOMEM; 1326 goto err_destroy_percpu; 1327 } 1328 1329 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1330 INIT_HLIST_HEAD(&dp->ports[i]); 1331 1332 /* Set up our datapath device. */ 1333 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1334 parms.type = OVS_VPORT_TYPE_INTERNAL; 1335 parms.options = NULL; 1336 parms.dp = dp; 1337 parms.port_no = OVSP_LOCAL; 1338 parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]); 1339 1340 vport = new_vport(&parms); 1341 if (IS_ERR(vport)) { 1342 err = PTR_ERR(vport); 1343 if (err == -EBUSY) 1344 err = -EEXIST; 1345 1346 goto err_destroy_ports_array; 1347 } 1348 1349 reply = ovs_dp_cmd_build_info(dp, info->snd_portid, 1350 info->snd_seq, OVS_DP_CMD_NEW); 1351 err = PTR_ERR(reply); 1352 if (IS_ERR(reply)) 1353 goto err_destroy_local_port; 1354 1355 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1356 list_add_tail(&dp->list_node, &ovs_net->dps); 1357 rtnl_unlock(); 1358 1359 genl_notify(reply, genl_info_net(info), info->snd_portid, 1360 ovs_dp_datapath_multicast_group.id, info->nlhdr, 1361 GFP_KERNEL); 1362 return 0; 1363 1364 err_destroy_local_port: 1365 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL)); 1366 err_destroy_ports_array: 1367 kfree(dp->ports); 1368 err_destroy_percpu: 1369 free_percpu(dp->stats_percpu); 1370 err_destroy_table: 1371 ovs_flow_tbl_destroy(genl_dereference(dp->table)); 1372 err_free_dp: 1373 release_net(ovs_dp_get_net(dp)); 1374 kfree(dp); 1375 err_unlock_rtnl: 1376 rtnl_unlock(); 1377 err: 1378 return err; 1379 } 1380 1381 /* Called with genl_mutex. */ 1382 static void __dp_destroy(struct datapath *dp) 1383 { 1384 int i; 1385 1386 rtnl_lock(); 1387 1388 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1389 struct vport *vport; 1390 struct hlist_node *n; 1391 1392 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1393 if (vport->port_no != OVSP_LOCAL) 1394 ovs_dp_detach_port(vport); 1395 } 1396 1397 list_del(&dp->list_node); 1398 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL)); 1399 1400 /* rtnl_unlock() will wait until all the references to devices that 1401 * are pending unregistration have been dropped. We do it here to 1402 * ensure that any internal devices (which contain DP pointers) are 1403 * fully destroyed before freeing the datapath. 1404 */ 1405 rtnl_unlock(); 1406 1407 call_rcu(&dp->rcu, destroy_dp_rcu); 1408 } 1409 1410 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1411 { 1412 struct sk_buff *reply; 1413 struct datapath *dp; 1414 int err; 1415 1416 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1417 err = PTR_ERR(dp); 1418 if (IS_ERR(dp)) 1419 return err; 1420 1421 reply = ovs_dp_cmd_build_info(dp, info->snd_portid, 1422 info->snd_seq, OVS_DP_CMD_DEL); 1423 err = PTR_ERR(reply); 1424 if (IS_ERR(reply)) 1425 return err; 1426 1427 __dp_destroy(dp); 1428 1429 genl_notify(reply, genl_info_net(info), info->snd_portid, 1430 ovs_dp_datapath_multicast_group.id, info->nlhdr, 1431 GFP_KERNEL); 1432 1433 return 0; 1434 } 1435 1436 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1437 { 1438 struct sk_buff *reply; 1439 struct datapath *dp; 1440 int err; 1441 1442 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1443 if (IS_ERR(dp)) 1444 return PTR_ERR(dp); 1445 1446 reply = ovs_dp_cmd_build_info(dp, info->snd_portid, 1447 info->snd_seq, OVS_DP_CMD_NEW); 1448 if (IS_ERR(reply)) { 1449 err = PTR_ERR(reply); 1450 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 1451 ovs_dp_datapath_multicast_group.id, err); 1452 return 0; 1453 } 1454 1455 genl_notify(reply, genl_info_net(info), info->snd_portid, 1456 ovs_dp_datapath_multicast_group.id, info->nlhdr, 1457 GFP_KERNEL); 1458 1459 return 0; 1460 } 1461 1462 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1463 { 1464 struct sk_buff *reply; 1465 struct datapath *dp; 1466 1467 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1468 if (IS_ERR(dp)) 1469 return PTR_ERR(dp); 1470 1471 reply = ovs_dp_cmd_build_info(dp, info->snd_portid, 1472 info->snd_seq, OVS_DP_CMD_NEW); 1473 if (IS_ERR(reply)) 1474 return PTR_ERR(reply); 1475 1476 return genlmsg_reply(reply, info); 1477 } 1478 1479 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1480 { 1481 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1482 struct datapath *dp; 1483 int skip = cb->args[0]; 1484 int i = 0; 1485 1486 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1487 if (i >= skip && 1488 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1489 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1490 OVS_DP_CMD_NEW) < 0) 1491 break; 1492 i++; 1493 } 1494 1495 cb->args[0] = i; 1496 1497 return skb->len; 1498 } 1499 1500 static struct genl_ops dp_datapath_genl_ops[] = { 1501 { .cmd = OVS_DP_CMD_NEW, 1502 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1503 .policy = datapath_policy, 1504 .doit = ovs_dp_cmd_new 1505 }, 1506 { .cmd = OVS_DP_CMD_DEL, 1507 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1508 .policy = datapath_policy, 1509 .doit = ovs_dp_cmd_del 1510 }, 1511 { .cmd = OVS_DP_CMD_GET, 1512 .flags = 0, /* OK for unprivileged users. */ 1513 .policy = datapath_policy, 1514 .doit = ovs_dp_cmd_get, 1515 .dumpit = ovs_dp_cmd_dump 1516 }, 1517 { .cmd = OVS_DP_CMD_SET, 1518 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1519 .policy = datapath_policy, 1520 .doit = ovs_dp_cmd_set, 1521 }, 1522 }; 1523 1524 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 1525 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1526 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 1527 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 1528 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 1529 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1530 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 1531 }; 1532 1533 static struct genl_family dp_vport_genl_family = { 1534 .id = GENL_ID_GENERATE, 1535 .hdrsize = sizeof(struct ovs_header), 1536 .name = OVS_VPORT_FAMILY, 1537 .version = OVS_VPORT_VERSION, 1538 .maxattr = OVS_VPORT_ATTR_MAX, 1539 .netnsok = true 1540 }; 1541 1542 struct genl_multicast_group ovs_dp_vport_multicast_group = { 1543 .name = OVS_VPORT_MCGROUP 1544 }; 1545 1546 /* Called with RTNL lock or RCU read lock. */ 1547 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1548 u32 portid, u32 seq, u32 flags, u8 cmd) 1549 { 1550 struct ovs_header *ovs_header; 1551 struct ovs_vport_stats vport_stats; 1552 int err; 1553 1554 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1555 flags, cmd); 1556 if (!ovs_header) 1557 return -EMSGSIZE; 1558 1559 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1560 1561 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1562 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1563 nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) || 1564 nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid)) 1565 goto nla_put_failure; 1566 1567 ovs_vport_get_stats(vport, &vport_stats); 1568 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), 1569 &vport_stats)) 1570 goto nla_put_failure; 1571 1572 err = ovs_vport_get_options(vport, skb); 1573 if (err == -EMSGSIZE) 1574 goto error; 1575 1576 return genlmsg_end(skb, ovs_header); 1577 1578 nla_put_failure: 1579 err = -EMSGSIZE; 1580 error: 1581 genlmsg_cancel(skb, ovs_header); 1582 return err; 1583 } 1584 1585 /* Called with RTNL lock or RCU read lock. */ 1586 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid, 1587 u32 seq, u8 cmd) 1588 { 1589 struct sk_buff *skb; 1590 int retval; 1591 1592 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1593 if (!skb) 1594 return ERR_PTR(-ENOMEM); 1595 1596 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd); 1597 if (retval < 0) { 1598 kfree_skb(skb); 1599 return ERR_PTR(retval); 1600 } 1601 return skb; 1602 } 1603 1604 /* Called with RTNL lock or RCU read lock. */ 1605 static struct vport *lookup_vport(struct net *net, 1606 struct ovs_header *ovs_header, 1607 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1608 { 1609 struct datapath *dp; 1610 struct vport *vport; 1611 1612 if (a[OVS_VPORT_ATTR_NAME]) { 1613 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 1614 if (!vport) 1615 return ERR_PTR(-ENODEV); 1616 if (ovs_header->dp_ifindex && 1617 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 1618 return ERR_PTR(-ENODEV); 1619 return vport; 1620 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 1621 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1622 1623 if (port_no >= DP_MAX_PORTS) 1624 return ERR_PTR(-EFBIG); 1625 1626 dp = get_dp(net, ovs_header->dp_ifindex); 1627 if (!dp) 1628 return ERR_PTR(-ENODEV); 1629 1630 vport = ovs_vport_rtnl_rcu(dp, port_no); 1631 if (!vport) 1632 return ERR_PTR(-ENODEV); 1633 return vport; 1634 } else 1635 return ERR_PTR(-EINVAL); 1636 } 1637 1638 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 1639 { 1640 struct nlattr **a = info->attrs; 1641 struct ovs_header *ovs_header = info->userhdr; 1642 struct vport_parms parms; 1643 struct sk_buff *reply; 1644 struct vport *vport; 1645 struct datapath *dp; 1646 u32 port_no; 1647 int err; 1648 1649 err = -EINVAL; 1650 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 1651 !a[OVS_VPORT_ATTR_UPCALL_PID]) 1652 goto exit; 1653 1654 rtnl_lock(); 1655 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1656 err = -ENODEV; 1657 if (!dp) 1658 goto exit_unlock; 1659 1660 if (a[OVS_VPORT_ATTR_PORT_NO]) { 1661 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1662 1663 err = -EFBIG; 1664 if (port_no >= DP_MAX_PORTS) 1665 goto exit_unlock; 1666 1667 vport = ovs_vport_rtnl_rcu(dp, port_no); 1668 err = -EBUSY; 1669 if (vport) 1670 goto exit_unlock; 1671 } else { 1672 for (port_no = 1; ; port_no++) { 1673 if (port_no >= DP_MAX_PORTS) { 1674 err = -EFBIG; 1675 goto exit_unlock; 1676 } 1677 vport = ovs_vport_rtnl(dp, port_no); 1678 if (!vport) 1679 break; 1680 } 1681 } 1682 1683 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 1684 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 1685 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 1686 parms.dp = dp; 1687 parms.port_no = port_no; 1688 parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); 1689 1690 vport = new_vport(&parms); 1691 err = PTR_ERR(vport); 1692 if (IS_ERR(vport)) 1693 goto exit_unlock; 1694 1695 err = 0; 1696 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, 1697 OVS_VPORT_CMD_NEW); 1698 if (IS_ERR(reply)) { 1699 err = PTR_ERR(reply); 1700 ovs_dp_detach_port(vport); 1701 goto exit_unlock; 1702 } 1703 genl_notify(reply, genl_info_net(info), info->snd_portid, 1704 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); 1705 1706 exit_unlock: 1707 rtnl_unlock(); 1708 exit: 1709 return err; 1710 } 1711 1712 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 1713 { 1714 struct nlattr **a = info->attrs; 1715 struct sk_buff *reply; 1716 struct vport *vport; 1717 int err; 1718 1719 rtnl_lock(); 1720 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1721 err = PTR_ERR(vport); 1722 if (IS_ERR(vport)) 1723 goto exit_unlock; 1724 1725 err = 0; 1726 if (a[OVS_VPORT_ATTR_TYPE] && 1727 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) 1728 err = -EINVAL; 1729 1730 if (!err && a[OVS_VPORT_ATTR_OPTIONS]) 1731 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 1732 if (err) 1733 goto exit_unlock; 1734 if (a[OVS_VPORT_ATTR_UPCALL_PID]) 1735 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); 1736 1737 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, 1738 OVS_VPORT_CMD_NEW); 1739 if (IS_ERR(reply)) { 1740 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 1741 ovs_dp_vport_multicast_group.id, PTR_ERR(reply)); 1742 goto exit_unlock; 1743 } 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 exit_unlock: 1749 rtnl_unlock(); 1750 return err; 1751 } 1752 1753 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 1754 { 1755 struct nlattr **a = info->attrs; 1756 struct sk_buff *reply; 1757 struct vport *vport; 1758 int err; 1759 1760 rtnl_lock(); 1761 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1762 err = PTR_ERR(vport); 1763 if (IS_ERR(vport)) 1764 goto exit_unlock; 1765 1766 if (vport->port_no == OVSP_LOCAL) { 1767 err = -EINVAL; 1768 goto exit_unlock; 1769 } 1770 1771 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, 1772 OVS_VPORT_CMD_DEL); 1773 err = PTR_ERR(reply); 1774 if (IS_ERR(reply)) 1775 goto exit_unlock; 1776 1777 err = 0; 1778 ovs_dp_detach_port(vport); 1779 1780 genl_notify(reply, genl_info_net(info), info->snd_portid, 1781 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); 1782 1783 exit_unlock: 1784 rtnl_unlock(); 1785 return err; 1786 } 1787 1788 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 1789 { 1790 struct nlattr **a = info->attrs; 1791 struct ovs_header *ovs_header = info->userhdr; 1792 struct sk_buff *reply; 1793 struct vport *vport; 1794 int err; 1795 1796 rcu_read_lock(); 1797 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 1798 err = PTR_ERR(vport); 1799 if (IS_ERR(vport)) 1800 goto exit_unlock; 1801 1802 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, 1803 OVS_VPORT_CMD_NEW); 1804 err = PTR_ERR(reply); 1805 if (IS_ERR(reply)) 1806 goto exit_unlock; 1807 1808 rcu_read_unlock(); 1809 1810 return genlmsg_reply(reply, info); 1811 1812 exit_unlock: 1813 rcu_read_unlock(); 1814 return err; 1815 } 1816 1817 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1818 { 1819 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1820 struct datapath *dp; 1821 int bucket = cb->args[0], skip = cb->args[1]; 1822 int i, j = 0; 1823 1824 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1825 if (!dp) 1826 return -ENODEV; 1827 1828 rcu_read_lock(); 1829 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 1830 struct vport *vport; 1831 1832 j = 0; 1833 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 1834 if (j >= skip && 1835 ovs_vport_cmd_fill_info(vport, skb, 1836 NETLINK_CB(cb->skb).portid, 1837 cb->nlh->nlmsg_seq, 1838 NLM_F_MULTI, 1839 OVS_VPORT_CMD_NEW) < 0) 1840 goto out; 1841 1842 j++; 1843 } 1844 skip = 0; 1845 } 1846 out: 1847 rcu_read_unlock(); 1848 1849 cb->args[0] = i; 1850 cb->args[1] = j; 1851 1852 return skb->len; 1853 } 1854 1855 static struct genl_ops dp_vport_genl_ops[] = { 1856 { .cmd = OVS_VPORT_CMD_NEW, 1857 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1858 .policy = vport_policy, 1859 .doit = ovs_vport_cmd_new 1860 }, 1861 { .cmd = OVS_VPORT_CMD_DEL, 1862 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1863 .policy = vport_policy, 1864 .doit = ovs_vport_cmd_del 1865 }, 1866 { .cmd = OVS_VPORT_CMD_GET, 1867 .flags = 0, /* OK for unprivileged users. */ 1868 .policy = vport_policy, 1869 .doit = ovs_vport_cmd_get, 1870 .dumpit = ovs_vport_cmd_dump 1871 }, 1872 { .cmd = OVS_VPORT_CMD_SET, 1873 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1874 .policy = vport_policy, 1875 .doit = ovs_vport_cmd_set, 1876 }, 1877 }; 1878 1879 struct genl_family_and_ops { 1880 struct genl_family *family; 1881 struct genl_ops *ops; 1882 int n_ops; 1883 struct genl_multicast_group *group; 1884 }; 1885 1886 static const struct genl_family_and_ops dp_genl_families[] = { 1887 { &dp_datapath_genl_family, 1888 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops), 1889 &ovs_dp_datapath_multicast_group }, 1890 { &dp_vport_genl_family, 1891 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops), 1892 &ovs_dp_vport_multicast_group }, 1893 { &dp_flow_genl_family, 1894 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops), 1895 &ovs_dp_flow_multicast_group }, 1896 { &dp_packet_genl_family, 1897 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops), 1898 NULL }, 1899 }; 1900 1901 static void dp_unregister_genl(int n_families) 1902 { 1903 int i; 1904 1905 for (i = 0; i < n_families; i++) 1906 genl_unregister_family(dp_genl_families[i].family); 1907 } 1908 1909 static int dp_register_genl(void) 1910 { 1911 int n_registered; 1912 int err; 1913 int i; 1914 1915 n_registered = 0; 1916 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 1917 const struct genl_family_and_ops *f = &dp_genl_families[i]; 1918 1919 err = genl_register_family_with_ops(f->family, f->ops, 1920 f->n_ops); 1921 if (err) 1922 goto error; 1923 n_registered++; 1924 1925 if (f->group) { 1926 err = genl_register_mc_group(f->family, f->group); 1927 if (err) 1928 goto error; 1929 } 1930 } 1931 1932 return 0; 1933 1934 error: 1935 dp_unregister_genl(n_registered); 1936 return err; 1937 } 1938 1939 static void rehash_flow_table(struct work_struct *work) 1940 { 1941 struct datapath *dp; 1942 struct net *net; 1943 1944 genl_lock(); 1945 rtnl_lock(); 1946 for_each_net(net) { 1947 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1948 1949 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1950 struct flow_table *old_table = genl_dereference(dp->table); 1951 struct flow_table *new_table; 1952 1953 new_table = ovs_flow_tbl_rehash(old_table); 1954 if (!IS_ERR(new_table)) { 1955 rcu_assign_pointer(dp->table, new_table); 1956 ovs_flow_tbl_deferred_destroy(old_table); 1957 } 1958 } 1959 } 1960 rtnl_unlock(); 1961 genl_unlock(); 1962 1963 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); 1964 } 1965 1966 static int __net_init ovs_init_net(struct net *net) 1967 { 1968 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1969 1970 INIT_LIST_HEAD(&ovs_net->dps); 1971 return 0; 1972 } 1973 1974 static void __net_exit ovs_exit_net(struct net *net) 1975 { 1976 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1977 struct datapath *dp, *dp_next; 1978 1979 genl_lock(); 1980 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 1981 __dp_destroy(dp); 1982 genl_unlock(); 1983 } 1984 1985 static struct pernet_operations ovs_net_ops = { 1986 .init = ovs_init_net, 1987 .exit = ovs_exit_net, 1988 .id = &ovs_net_id, 1989 .size = sizeof(struct ovs_net), 1990 }; 1991 1992 static int __init dp_init(void) 1993 { 1994 int err; 1995 1996 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); 1997 1998 pr_info("Open vSwitch switching datapath\n"); 1999 2000 err = ovs_flow_init(); 2001 if (err) 2002 goto error; 2003 2004 err = ovs_vport_init(); 2005 if (err) 2006 goto error_flow_exit; 2007 2008 err = register_pernet_device(&ovs_net_ops); 2009 if (err) 2010 goto error_vport_exit; 2011 2012 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2013 if (err) 2014 goto error_netns_exit; 2015 2016 err = dp_register_genl(); 2017 if (err < 0) 2018 goto error_unreg_notifier; 2019 2020 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); 2021 2022 return 0; 2023 2024 error_unreg_notifier: 2025 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2026 error_netns_exit: 2027 unregister_pernet_device(&ovs_net_ops); 2028 error_vport_exit: 2029 ovs_vport_exit(); 2030 error_flow_exit: 2031 ovs_flow_exit(); 2032 error: 2033 return err; 2034 } 2035 2036 static void dp_cleanup(void) 2037 { 2038 cancel_delayed_work_sync(&rehash_flow_wq); 2039 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2040 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2041 unregister_pernet_device(&ovs_net_ops); 2042 rcu_barrier(); 2043 ovs_vport_exit(); 2044 ovs_flow_exit(); 2045 } 2046 2047 module_init(dp_init); 2048 module_exit(dp_cleanup); 2049 2050 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2051 MODULE_LICENSE("GPL"); 2052