datapath.c revision 4490108b4a5ada14c7be712260829faecc814ae5
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 */ 64struct ovs_net { 65 struct list_head dps; 66}; 67 68static int ovs_net_id __read_mostly; 69 70#define REHASH_FLOW_INTERVAL (10 * 60 * HZ) 71static void rehash_flow_table(struct work_struct *work); 72static 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 91static struct vport *new_vport(const struct vport_parms *); 92static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *, 93 const struct dp_upcall_info *); 94static 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. */ 99static 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. */ 117const 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 123static 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 141static 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 152static 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 158struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 159{ 160 struct vport *vport; 161 struct hlist_node *n; 162 struct hlist_head *head; 163 164 head = vport_hash_bucket(dp, port_no); 165 hlist_for_each_entry_rcu(vport, n, head, dp_hash_node) { 166 if (vport->port_no == port_no) 167 return vport; 168 } 169 return NULL; 170} 171 172/* Called with RTNL lock and genl_lock. */ 173static struct vport *new_vport(const struct vport_parms *parms) 174{ 175 struct vport *vport; 176 177 vport = ovs_vport_add(parms); 178 if (!IS_ERR(vport)) { 179 struct datapath *dp = parms->dp; 180 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 181 182 hlist_add_head_rcu(&vport->dp_hash_node, head); 183 } 184 185 return vport; 186} 187 188/* Called with RTNL lock. */ 189void ovs_dp_detach_port(struct vport *p) 190{ 191 ASSERT_RTNL(); 192 193 /* First drop references to device. */ 194 hlist_del_rcu(&p->dp_hash_node); 195 196 /* Then destroy it. */ 197 ovs_vport_del(p); 198} 199 200/* Must be called with rcu_read_lock. */ 201void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb) 202{ 203 struct datapath *dp = p->dp; 204 struct sw_flow *flow; 205 struct dp_stats_percpu *stats; 206 struct sw_flow_key key; 207 u64 *stats_counter; 208 int error; 209 int key_len; 210 211 stats = this_cpu_ptr(dp->stats_percpu); 212 213 /* Extract flow from 'skb' into 'key'. */ 214 error = ovs_flow_extract(skb, p->port_no, &key, &key_len); 215 if (unlikely(error)) { 216 kfree_skb(skb); 217 return; 218 } 219 220 /* Look up flow. */ 221 flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len); 222 if (unlikely(!flow)) { 223 struct dp_upcall_info upcall; 224 225 upcall.cmd = OVS_PACKET_CMD_MISS; 226 upcall.key = &key; 227 upcall.userdata = NULL; 228 upcall.portid = p->upcall_portid; 229 ovs_dp_upcall(dp, skb, &upcall); 230 consume_skb(skb); 231 stats_counter = &stats->n_missed; 232 goto out; 233 } 234 235 OVS_CB(skb)->flow = flow; 236 237 stats_counter = &stats->n_hit; 238 ovs_flow_used(OVS_CB(skb)->flow, skb); 239 ovs_execute_actions(dp, skb); 240 241out: 242 /* Update datapath statistics. */ 243 u64_stats_update_begin(&stats->sync); 244 (*stats_counter)++; 245 u64_stats_update_end(&stats->sync); 246} 247 248static struct genl_family dp_packet_genl_family = { 249 .id = GENL_ID_GENERATE, 250 .hdrsize = sizeof(struct ovs_header), 251 .name = OVS_PACKET_FAMILY, 252 .version = OVS_PACKET_VERSION, 253 .maxattr = OVS_PACKET_ATTR_MAX, 254 .netnsok = true 255}; 256 257int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 258 const struct dp_upcall_info *upcall_info) 259{ 260 struct dp_stats_percpu *stats; 261 int dp_ifindex; 262 int err; 263 264 if (upcall_info->portid == 0) { 265 err = -ENOTCONN; 266 goto err; 267 } 268 269 dp_ifindex = get_dpifindex(dp); 270 if (!dp_ifindex) { 271 err = -ENODEV; 272 goto err; 273 } 274 275 if (!skb_is_gso(skb)) 276 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info); 277 else 278 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info); 279 if (err) 280 goto err; 281 282 return 0; 283 284err: 285 stats = this_cpu_ptr(dp->stats_percpu); 286 287 u64_stats_update_begin(&stats->sync); 288 stats->n_lost++; 289 u64_stats_update_end(&stats->sync); 290 291 return err; 292} 293 294static int queue_gso_packets(struct net *net, int dp_ifindex, 295 struct sk_buff *skb, 296 const struct dp_upcall_info *upcall_info) 297{ 298 unsigned short gso_type = skb_shinfo(skb)->gso_type; 299 struct dp_upcall_info later_info; 300 struct sw_flow_key later_key; 301 struct sk_buff *segs, *nskb; 302 int err; 303 304 segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM); 305 if (IS_ERR(segs)) 306 return PTR_ERR(segs); 307 308 /* Queue all of the segments. */ 309 skb = segs; 310 do { 311 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info); 312 if (err) 313 break; 314 315 if (skb == segs && gso_type & SKB_GSO_UDP) { 316 /* The initial flow key extracted by ovs_flow_extract() 317 * in this case is for a first fragment, so we need to 318 * properly mark later fragments. 319 */ 320 later_key = *upcall_info->key; 321 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 322 323 later_info = *upcall_info; 324 later_info.key = &later_key; 325 upcall_info = &later_info; 326 } 327 } while ((skb = skb->next)); 328 329 /* Free all of the segments. */ 330 skb = segs; 331 do { 332 nskb = skb->next; 333 if (err) 334 kfree_skb(skb); 335 else 336 consume_skb(skb); 337 } while ((skb = nskb)); 338 return err; 339} 340 341static int queue_userspace_packet(struct net *net, int dp_ifindex, 342 struct sk_buff *skb, 343 const struct dp_upcall_info *upcall_info) 344{ 345 struct ovs_header *upcall; 346 struct sk_buff *nskb = NULL; 347 struct sk_buff *user_skb; /* to be queued to userspace */ 348 struct nlattr *nla; 349 unsigned int len; 350 int err; 351 352 if (vlan_tx_tag_present(skb)) { 353 nskb = skb_clone(skb, GFP_ATOMIC); 354 if (!nskb) 355 return -ENOMEM; 356 357 nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb)); 358 if (!nskb) 359 return -ENOMEM; 360 361 nskb->vlan_tci = 0; 362 skb = nskb; 363 } 364 365 if (nla_attr_size(skb->len) > USHRT_MAX) { 366 err = -EFBIG; 367 goto out; 368 } 369 370 len = sizeof(struct ovs_header); 371 len += nla_total_size(skb->len); 372 len += nla_total_size(FLOW_BUFSIZE); 373 if (upcall_info->userdata) 374 len += NLA_ALIGN(upcall_info->userdata->nla_len); 375 376 user_skb = genlmsg_new(len, GFP_ATOMIC); 377 if (!user_skb) { 378 err = -ENOMEM; 379 goto out; 380 } 381 382 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 383 0, upcall_info->cmd); 384 upcall->dp_ifindex = dp_ifindex; 385 386 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY); 387 ovs_flow_to_nlattrs(upcall_info->key, user_skb); 388 nla_nest_end(user_skb, nla); 389 390 if (upcall_info->userdata) 391 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 392 nla_len(upcall_info->userdata), 393 nla_data(upcall_info->userdata)); 394 395 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len); 396 397 skb_copy_and_csum_dev(skb, nla_data(nla)); 398 399 err = genlmsg_unicast(net, user_skb, upcall_info->portid); 400 401out: 402 kfree_skb(nskb); 403 return err; 404} 405 406/* Called with genl_mutex. */ 407static 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 423static int validate_actions(const struct nlattr *attr, 424 const struct sw_flow_key *key, int depth); 425 426static 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 454static 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 467static 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 544static 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 565static 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 642static 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 650static 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) >= 1536) 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 736err_unlock: 737 rcu_read_unlock(); 738err_flow_free: 739 ovs_flow_free(flow); 740err_kfree_skb: 741 kfree_skb(packet); 742err: 743 return err; 744} 745 746static 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 752static 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 760static 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 786static 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 792static 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 801static struct genl_multicast_group ovs_dp_flow_multicast_group = { 802 .name = OVS_FLOW_MCGROUP 803}; 804 805/* Called with genl_lock. */ 806static 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 873nla_put_failure: 874 err = -EMSGSIZE; 875error: 876 genlmsg_cancel(skb, ovs_header); 877 return err; 878} 879 880static 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 904static 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 920static 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 1055error_free_flow: 1056 ovs_flow_free(flow); 1057error: 1058 return error; 1059} 1060 1061static 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 1096static 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 1141static 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 1175static 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 1199static 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 1204static 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 1213static struct genl_multicast_group ovs_dp_datapath_multicast_group = { 1214 .name = OVS_DATAPATH_MCGROUP 1215}; 1216 1217static 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 1243nla_put_failure: 1244 genlmsg_cancel(skb, ovs_header); 1245error: 1246 return -EMSGSIZE; 1247} 1248 1249static 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. */ 1268static 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 1287static 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 1364err_destroy_local_port: 1365 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL)); 1366err_destroy_ports_array: 1367 kfree(dp->ports); 1368err_destroy_percpu: 1369 free_percpu(dp->stats_percpu); 1370err_destroy_table: 1371 ovs_flow_tbl_destroy(genl_dereference(dp->table)); 1372err_free_dp: 1373 release_net(ovs_dp_get_net(dp)); 1374 kfree(dp); 1375err_unlock_rtnl: 1376 rtnl_unlock(); 1377err: 1378 return err; 1379} 1380 1381/* Called with genl_mutex. */ 1382static 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 *node, *n; 1391 1392 hlist_for_each_entry_safe(vport, node, 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 1410static 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 1436static 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 1462static 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 1479static 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 1500static 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 1524static 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 1533static 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 1542struct genl_multicast_group ovs_dp_vport_multicast_group = { 1543 .name = OVS_VPORT_MCGROUP 1544}; 1545 1546/* Called with RTNL lock or RCU read lock. */ 1547static 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 1578nla_put_failure: 1579 err = -EMSGSIZE; 1580error: 1581 genlmsg_cancel(skb, ovs_header); 1582 return err; 1583} 1584 1585/* Called with RTNL lock or RCU read lock. */ 1586struct 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. */ 1605static 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 1638static 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 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, 1696 OVS_VPORT_CMD_NEW); 1697 if (IS_ERR(reply)) { 1698 err = PTR_ERR(reply); 1699 ovs_dp_detach_port(vport); 1700 goto exit_unlock; 1701 } 1702 genl_notify(reply, genl_info_net(info), info->snd_portid, 1703 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); 1704 1705exit_unlock: 1706 rtnl_unlock(); 1707exit: 1708 return err; 1709} 1710 1711static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 1712{ 1713 struct nlattr **a = info->attrs; 1714 struct sk_buff *reply; 1715 struct vport *vport; 1716 int err; 1717 1718 rtnl_lock(); 1719 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1720 err = PTR_ERR(vport); 1721 if (IS_ERR(vport)) 1722 goto exit_unlock; 1723 1724 err = 0; 1725 if (a[OVS_VPORT_ATTR_TYPE] && 1726 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) 1727 err = -EINVAL; 1728 1729 if (!err && a[OVS_VPORT_ATTR_OPTIONS]) 1730 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 1731 if (err) 1732 goto exit_unlock; 1733 if (a[OVS_VPORT_ATTR_UPCALL_PID]) 1734 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); 1735 1736 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, 1737 OVS_VPORT_CMD_NEW); 1738 if (IS_ERR(reply)) { 1739 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 1740 ovs_dp_vport_multicast_group.id, PTR_ERR(reply)); 1741 goto exit_unlock; 1742 } 1743 1744 genl_notify(reply, genl_info_net(info), info->snd_portid, 1745 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); 1746 1747exit_unlock: 1748 rtnl_unlock(); 1749 return err; 1750} 1751 1752static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 1753{ 1754 struct nlattr **a = info->attrs; 1755 struct sk_buff *reply; 1756 struct vport *vport; 1757 int err; 1758 1759 rtnl_lock(); 1760 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1761 err = PTR_ERR(vport); 1762 if (IS_ERR(vport)) 1763 goto exit_unlock; 1764 1765 if (vport->port_no == OVSP_LOCAL) { 1766 err = -EINVAL; 1767 goto exit_unlock; 1768 } 1769 1770 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, 1771 OVS_VPORT_CMD_DEL); 1772 err = PTR_ERR(reply); 1773 if (IS_ERR(reply)) 1774 goto exit_unlock; 1775 1776 ovs_dp_detach_port(vport); 1777 1778 genl_notify(reply, genl_info_net(info), info->snd_portid, 1779 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); 1780 1781exit_unlock: 1782 rtnl_unlock(); 1783 return err; 1784} 1785 1786static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 1787{ 1788 struct nlattr **a = info->attrs; 1789 struct ovs_header *ovs_header = info->userhdr; 1790 struct sk_buff *reply; 1791 struct vport *vport; 1792 int err; 1793 1794 rcu_read_lock(); 1795 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 1796 err = PTR_ERR(vport); 1797 if (IS_ERR(vport)) 1798 goto exit_unlock; 1799 1800 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, 1801 OVS_VPORT_CMD_NEW); 1802 err = PTR_ERR(reply); 1803 if (IS_ERR(reply)) 1804 goto exit_unlock; 1805 1806 rcu_read_unlock(); 1807 1808 return genlmsg_reply(reply, info); 1809 1810exit_unlock: 1811 rcu_read_unlock(); 1812 return err; 1813} 1814 1815static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1816{ 1817 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1818 struct datapath *dp; 1819 int bucket = cb->args[0], skip = cb->args[1]; 1820 int i, j = 0; 1821 1822 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1823 if (!dp) 1824 return -ENODEV; 1825 1826 rcu_read_lock(); 1827 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 1828 struct vport *vport; 1829 struct hlist_node *n; 1830 1831 j = 0; 1832 hlist_for_each_entry_rcu(vport, n, &dp->ports[i], dp_hash_node) { 1833 if (j >= skip && 1834 ovs_vport_cmd_fill_info(vport, skb, 1835 NETLINK_CB(cb->skb).portid, 1836 cb->nlh->nlmsg_seq, 1837 NLM_F_MULTI, 1838 OVS_VPORT_CMD_NEW) < 0) 1839 goto out; 1840 1841 j++; 1842 } 1843 skip = 0; 1844 } 1845out: 1846 rcu_read_unlock(); 1847 1848 cb->args[0] = i; 1849 cb->args[1] = j; 1850 1851 return skb->len; 1852} 1853 1854static struct genl_ops dp_vport_genl_ops[] = { 1855 { .cmd = OVS_VPORT_CMD_NEW, 1856 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1857 .policy = vport_policy, 1858 .doit = ovs_vport_cmd_new 1859 }, 1860 { .cmd = OVS_VPORT_CMD_DEL, 1861 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1862 .policy = vport_policy, 1863 .doit = ovs_vport_cmd_del 1864 }, 1865 { .cmd = OVS_VPORT_CMD_GET, 1866 .flags = 0, /* OK for unprivileged users. */ 1867 .policy = vport_policy, 1868 .doit = ovs_vport_cmd_get, 1869 .dumpit = ovs_vport_cmd_dump 1870 }, 1871 { .cmd = OVS_VPORT_CMD_SET, 1872 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1873 .policy = vport_policy, 1874 .doit = ovs_vport_cmd_set, 1875 }, 1876}; 1877 1878struct genl_family_and_ops { 1879 struct genl_family *family; 1880 struct genl_ops *ops; 1881 int n_ops; 1882 struct genl_multicast_group *group; 1883}; 1884 1885static const struct genl_family_and_ops dp_genl_families[] = { 1886 { &dp_datapath_genl_family, 1887 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops), 1888 &ovs_dp_datapath_multicast_group }, 1889 { &dp_vport_genl_family, 1890 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops), 1891 &ovs_dp_vport_multicast_group }, 1892 { &dp_flow_genl_family, 1893 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops), 1894 &ovs_dp_flow_multicast_group }, 1895 { &dp_packet_genl_family, 1896 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops), 1897 NULL }, 1898}; 1899 1900static void dp_unregister_genl(int n_families) 1901{ 1902 int i; 1903 1904 for (i = 0; i < n_families; i++) 1905 genl_unregister_family(dp_genl_families[i].family); 1906} 1907 1908static int dp_register_genl(void) 1909{ 1910 int n_registered; 1911 int err; 1912 int i; 1913 1914 n_registered = 0; 1915 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 1916 const struct genl_family_and_ops *f = &dp_genl_families[i]; 1917 1918 err = genl_register_family_with_ops(f->family, f->ops, 1919 f->n_ops); 1920 if (err) 1921 goto error; 1922 n_registered++; 1923 1924 if (f->group) { 1925 err = genl_register_mc_group(f->family, f->group); 1926 if (err) 1927 goto error; 1928 } 1929 } 1930 1931 return 0; 1932 1933error: 1934 dp_unregister_genl(n_registered); 1935 return err; 1936} 1937 1938static void rehash_flow_table(struct work_struct *work) 1939{ 1940 struct datapath *dp; 1941 struct net *net; 1942 1943 genl_lock(); 1944 rtnl_lock(); 1945 for_each_net(net) { 1946 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1947 1948 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1949 struct flow_table *old_table = genl_dereference(dp->table); 1950 struct flow_table *new_table; 1951 1952 new_table = ovs_flow_tbl_rehash(old_table); 1953 if (!IS_ERR(new_table)) { 1954 rcu_assign_pointer(dp->table, new_table); 1955 ovs_flow_tbl_deferred_destroy(old_table); 1956 } 1957 } 1958 } 1959 rtnl_unlock(); 1960 genl_unlock(); 1961 1962 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); 1963} 1964 1965static int __net_init ovs_init_net(struct net *net) 1966{ 1967 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1968 1969 INIT_LIST_HEAD(&ovs_net->dps); 1970 return 0; 1971} 1972 1973static void __net_exit ovs_exit_net(struct net *net) 1974{ 1975 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1976 struct datapath *dp, *dp_next; 1977 1978 genl_lock(); 1979 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 1980 __dp_destroy(dp); 1981 genl_unlock(); 1982} 1983 1984static struct pernet_operations ovs_net_ops = { 1985 .init = ovs_init_net, 1986 .exit = ovs_exit_net, 1987 .id = &ovs_net_id, 1988 .size = sizeof(struct ovs_net), 1989}; 1990 1991static int __init dp_init(void) 1992{ 1993 struct sk_buff *dummy_skb; 1994 int err; 1995 1996 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->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 2024error_unreg_notifier: 2025 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2026error_netns_exit: 2027 unregister_pernet_device(&ovs_net_ops); 2028error_vport_exit: 2029 ovs_vport_exit(); 2030error_flow_exit: 2031 ovs_flow_exit(); 2032error: 2033 return err; 2034} 2035 2036static 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 2047module_init(dp_init); 2048module_exit(dp_cleanup); 2049 2050MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2051MODULE_LICENSE("GPL"); 2052