datapath.c revision ed661185859cecfcbe3a0e585563525498b3f405
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 74static void ovs_notify(struct sk_buff *skb, struct genl_info *info, 75 struct genl_multicast_group *grp) 76{ 77 genl_notify(skb, genl_info_net(info), info->snd_portid, 78 grp->id, info->nlhdr, GFP_KERNEL); 79} 80 81/** 82 * DOC: Locking: 83 * 84 * Writes to device state (add/remove datapath, port, set operations on vports, 85 * etc.) are protected by RTNL. 86 * 87 * Writes to other state (flow table modifications, set miscellaneous datapath 88 * parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside 89 * genl_mutex. 90 * 91 * Reads are protected by RCU. 92 * 93 * There are a few special cases (mostly stats) that have their own 94 * synchronization but they nest under all of above and don't interact with 95 * each other. 96 */ 97 98static struct vport *new_vport(const struct vport_parms *); 99static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *, 100 const struct dp_upcall_info *); 101static int queue_userspace_packet(struct net *, int dp_ifindex, 102 struct sk_buff *, 103 const struct dp_upcall_info *); 104 105/* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */ 106static struct datapath *get_dp(struct net *net, int dp_ifindex) 107{ 108 struct datapath *dp = NULL; 109 struct net_device *dev; 110 111 rcu_read_lock(); 112 dev = dev_get_by_index_rcu(net, dp_ifindex); 113 if (dev) { 114 struct vport *vport = ovs_internal_dev_get_vport(dev); 115 if (vport) 116 dp = vport->dp; 117 } 118 rcu_read_unlock(); 119 120 return dp; 121} 122 123/* Must be called with rcu_read_lock or RTNL lock. */ 124const char *ovs_dp_name(const struct datapath *dp) 125{ 126 struct vport *vport = ovs_vport_rtnl_rcu(dp, OVSP_LOCAL); 127 return vport->ops->get_name(vport); 128} 129 130static int get_dpifindex(struct datapath *dp) 131{ 132 struct vport *local; 133 int ifindex; 134 135 rcu_read_lock(); 136 137 local = ovs_vport_rcu(dp, OVSP_LOCAL); 138 if (local) 139 ifindex = local->ops->get_ifindex(local); 140 else 141 ifindex = 0; 142 143 rcu_read_unlock(); 144 145 return ifindex; 146} 147 148static void destroy_dp_rcu(struct rcu_head *rcu) 149{ 150 struct datapath *dp = container_of(rcu, struct datapath, rcu); 151 152 ovs_flow_tbl_destroy((__force struct flow_table *)dp->table); 153 free_percpu(dp->stats_percpu); 154 release_net(ovs_dp_get_net(dp)); 155 kfree(dp->ports); 156 kfree(dp); 157} 158 159static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 160 u16 port_no) 161{ 162 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 163} 164 165struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 166{ 167 struct vport *vport; 168 struct hlist_head *head; 169 170 head = vport_hash_bucket(dp, port_no); 171 hlist_for_each_entry_rcu(vport, head, dp_hash_node) { 172 if (vport->port_no == port_no) 173 return vport; 174 } 175 return NULL; 176} 177 178/* Called with RTNL lock and genl_lock. */ 179static struct vport *new_vport(const struct vport_parms *parms) 180{ 181 struct vport *vport; 182 183 vport = ovs_vport_add(parms); 184 if (!IS_ERR(vport)) { 185 struct datapath *dp = parms->dp; 186 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 187 188 hlist_add_head_rcu(&vport->dp_hash_node, head); 189 } 190 191 return vport; 192} 193 194/* Called with RTNL lock. */ 195void ovs_dp_detach_port(struct vport *p) 196{ 197 ASSERT_RTNL(); 198 199 /* First drop references to device. */ 200 hlist_del_rcu(&p->dp_hash_node); 201 202 /* Then destroy it. */ 203 ovs_vport_del(p); 204} 205 206/* Must be called with rcu_read_lock. */ 207void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb) 208{ 209 struct datapath *dp = p->dp; 210 struct sw_flow *flow; 211 struct dp_stats_percpu *stats; 212 struct sw_flow_key key; 213 u64 *stats_counter; 214 int error; 215 int key_len; 216 217 stats = this_cpu_ptr(dp->stats_percpu); 218 219 /* Extract flow from 'skb' into 'key'. */ 220 error = ovs_flow_extract(skb, p->port_no, &key, &key_len); 221 if (unlikely(error)) { 222 kfree_skb(skb); 223 return; 224 } 225 226 /* Look up flow. */ 227 flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len); 228 if (unlikely(!flow)) { 229 struct dp_upcall_info upcall; 230 231 upcall.cmd = OVS_PACKET_CMD_MISS; 232 upcall.key = &key; 233 upcall.userdata = NULL; 234 upcall.portid = p->upcall_portid; 235 ovs_dp_upcall(dp, skb, &upcall); 236 consume_skb(skb); 237 stats_counter = &stats->n_missed; 238 goto out; 239 } 240 241 OVS_CB(skb)->flow = flow; 242 243 stats_counter = &stats->n_hit; 244 ovs_flow_used(OVS_CB(skb)->flow, skb); 245 ovs_execute_actions(dp, skb); 246 247out: 248 /* Update datapath statistics. */ 249 u64_stats_update_begin(&stats->sync); 250 (*stats_counter)++; 251 u64_stats_update_end(&stats->sync); 252} 253 254static struct genl_family dp_packet_genl_family = { 255 .id = GENL_ID_GENERATE, 256 .hdrsize = sizeof(struct ovs_header), 257 .name = OVS_PACKET_FAMILY, 258 .version = OVS_PACKET_VERSION, 259 .maxattr = OVS_PACKET_ATTR_MAX, 260 .netnsok = true 261}; 262 263int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 264 const struct dp_upcall_info *upcall_info) 265{ 266 struct dp_stats_percpu *stats; 267 int dp_ifindex; 268 int err; 269 270 if (upcall_info->portid == 0) { 271 err = -ENOTCONN; 272 goto err; 273 } 274 275 dp_ifindex = get_dpifindex(dp); 276 if (!dp_ifindex) { 277 err = -ENODEV; 278 goto err; 279 } 280 281 if (!skb_is_gso(skb)) 282 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info); 283 else 284 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info); 285 if (err) 286 goto err; 287 288 return 0; 289 290err: 291 stats = this_cpu_ptr(dp->stats_percpu); 292 293 u64_stats_update_begin(&stats->sync); 294 stats->n_lost++; 295 u64_stats_update_end(&stats->sync); 296 297 return err; 298} 299 300static int queue_gso_packets(struct net *net, int dp_ifindex, 301 struct sk_buff *skb, 302 const struct dp_upcall_info *upcall_info) 303{ 304 unsigned short gso_type = skb_shinfo(skb)->gso_type; 305 struct dp_upcall_info later_info; 306 struct sw_flow_key later_key; 307 struct sk_buff *segs, *nskb; 308 int err; 309 310 segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false); 311 if (IS_ERR(segs)) 312 return PTR_ERR(segs); 313 314 /* Queue all of the segments. */ 315 skb = segs; 316 do { 317 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info); 318 if (err) 319 break; 320 321 if (skb == segs && gso_type & SKB_GSO_UDP) { 322 /* The initial flow key extracted by ovs_flow_extract() 323 * in this case is for a first fragment, so we need to 324 * properly mark later fragments. 325 */ 326 later_key = *upcall_info->key; 327 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 328 329 later_info = *upcall_info; 330 later_info.key = &later_key; 331 upcall_info = &later_info; 332 } 333 } while ((skb = skb->next)); 334 335 /* Free all of the segments. */ 336 skb = segs; 337 do { 338 nskb = skb->next; 339 if (err) 340 kfree_skb(skb); 341 else 342 consume_skb(skb); 343 } while ((skb = nskb)); 344 return err; 345} 346 347static size_t key_attr_size(void) 348{ 349 return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */ 350 + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */ 351 + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */ 352 + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */ 353 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */ 354 + nla_total_size(4) /* OVS_KEY_ATTR_8021Q */ 355 + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */ 356 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */ 357 + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */ 358 + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */ 359 + nla_total_size(28); /* OVS_KEY_ATTR_ND */ 360} 361 362static size_t upcall_msg_size(const struct sk_buff *skb, 363 const struct nlattr *userdata) 364{ 365 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 366 + nla_total_size(skb->len) /* OVS_PACKET_ATTR_PACKET */ 367 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */ 368 369 /* OVS_PACKET_ATTR_USERDATA */ 370 if (userdata) 371 size += NLA_ALIGN(userdata->nla_len); 372 373 return size; 374} 375 376static int queue_userspace_packet(struct net *net, int dp_ifindex, 377 struct sk_buff *skb, 378 const struct dp_upcall_info *upcall_info) 379{ 380 struct ovs_header *upcall; 381 struct sk_buff *nskb = NULL; 382 struct sk_buff *user_skb; /* to be queued to userspace */ 383 struct nlattr *nla; 384 int err; 385 386 if (vlan_tx_tag_present(skb)) { 387 nskb = skb_clone(skb, GFP_ATOMIC); 388 if (!nskb) 389 return -ENOMEM; 390 391 nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb)); 392 if (!nskb) 393 return -ENOMEM; 394 395 nskb->vlan_tci = 0; 396 skb = nskb; 397 } 398 399 if (nla_attr_size(skb->len) > USHRT_MAX) { 400 err = -EFBIG; 401 goto out; 402 } 403 404 user_skb = genlmsg_new(upcall_msg_size(skb, upcall_info->userdata), GFP_ATOMIC); 405 if (!user_skb) { 406 err = -ENOMEM; 407 goto out; 408 } 409 410 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 411 0, upcall_info->cmd); 412 upcall->dp_ifindex = dp_ifindex; 413 414 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY); 415 ovs_flow_to_nlattrs(upcall_info->key, user_skb); 416 nla_nest_end(user_skb, nla); 417 418 if (upcall_info->userdata) 419 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 420 nla_len(upcall_info->userdata), 421 nla_data(upcall_info->userdata)); 422 423 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len); 424 425 skb_copy_and_csum_dev(skb, nla_data(nla)); 426 427 genlmsg_end(user_skb, upcall); 428 err = genlmsg_unicast(net, user_skb, upcall_info->portid); 429 430out: 431 kfree_skb(nskb); 432 return err; 433} 434 435/* Called with genl_mutex. */ 436static int flush_flows(struct datapath *dp) 437{ 438 struct flow_table *old_table; 439 struct flow_table *new_table; 440 441 old_table = genl_dereference(dp->table); 442 new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS); 443 if (!new_table) 444 return -ENOMEM; 445 446 rcu_assign_pointer(dp->table, new_table); 447 448 ovs_flow_tbl_deferred_destroy(old_table); 449 return 0; 450} 451 452static int validate_actions(const struct nlattr *attr, 453 const struct sw_flow_key *key, int depth); 454 455static int validate_sample(const struct nlattr *attr, 456 const struct sw_flow_key *key, int depth) 457{ 458 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1]; 459 const struct nlattr *probability, *actions; 460 const struct nlattr *a; 461 int rem; 462 463 memset(attrs, 0, sizeof(attrs)); 464 nla_for_each_nested(a, attr, rem) { 465 int type = nla_type(a); 466 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type]) 467 return -EINVAL; 468 attrs[type] = a; 469 } 470 if (rem) 471 return -EINVAL; 472 473 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY]; 474 if (!probability || nla_len(probability) != sizeof(u32)) 475 return -EINVAL; 476 477 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS]; 478 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN)) 479 return -EINVAL; 480 return validate_actions(actions, key, depth + 1); 481} 482 483static int validate_tp_port(const struct sw_flow_key *flow_key) 484{ 485 if (flow_key->eth.type == htons(ETH_P_IP)) { 486 if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst) 487 return 0; 488 } else if (flow_key->eth.type == htons(ETH_P_IPV6)) { 489 if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst) 490 return 0; 491 } 492 493 return -EINVAL; 494} 495 496static int validate_set(const struct nlattr *a, 497 const struct sw_flow_key *flow_key) 498{ 499 const struct nlattr *ovs_key = nla_data(a); 500 int key_type = nla_type(ovs_key); 501 502 /* There can be only one key in a action */ 503 if (nla_total_size(nla_len(ovs_key)) != nla_len(a)) 504 return -EINVAL; 505 506 if (key_type > OVS_KEY_ATTR_MAX || 507 nla_len(ovs_key) != ovs_key_lens[key_type]) 508 return -EINVAL; 509 510 switch (key_type) { 511 const struct ovs_key_ipv4 *ipv4_key; 512 const struct ovs_key_ipv6 *ipv6_key; 513 514 case OVS_KEY_ATTR_PRIORITY: 515 case OVS_KEY_ATTR_SKB_MARK: 516 case OVS_KEY_ATTR_ETHERNET: 517 break; 518 519 case OVS_KEY_ATTR_IPV4: 520 if (flow_key->eth.type != htons(ETH_P_IP)) 521 return -EINVAL; 522 523 if (!flow_key->ip.proto) 524 return -EINVAL; 525 526 ipv4_key = nla_data(ovs_key); 527 if (ipv4_key->ipv4_proto != flow_key->ip.proto) 528 return -EINVAL; 529 530 if (ipv4_key->ipv4_frag != flow_key->ip.frag) 531 return -EINVAL; 532 533 break; 534 535 case OVS_KEY_ATTR_IPV6: 536 if (flow_key->eth.type != htons(ETH_P_IPV6)) 537 return -EINVAL; 538 539 if (!flow_key->ip.proto) 540 return -EINVAL; 541 542 ipv6_key = nla_data(ovs_key); 543 if (ipv6_key->ipv6_proto != flow_key->ip.proto) 544 return -EINVAL; 545 546 if (ipv6_key->ipv6_frag != flow_key->ip.frag) 547 return -EINVAL; 548 549 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000) 550 return -EINVAL; 551 552 break; 553 554 case OVS_KEY_ATTR_TCP: 555 if (flow_key->ip.proto != IPPROTO_TCP) 556 return -EINVAL; 557 558 return validate_tp_port(flow_key); 559 560 case OVS_KEY_ATTR_UDP: 561 if (flow_key->ip.proto != IPPROTO_UDP) 562 return -EINVAL; 563 564 return validate_tp_port(flow_key); 565 566 default: 567 return -EINVAL; 568 } 569 570 return 0; 571} 572 573static int validate_userspace(const struct nlattr *attr) 574{ 575 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = { 576 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 }, 577 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC }, 578 }; 579 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1]; 580 int error; 581 582 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX, 583 attr, userspace_policy); 584 if (error) 585 return error; 586 587 if (!a[OVS_USERSPACE_ATTR_PID] || 588 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID])) 589 return -EINVAL; 590 591 return 0; 592} 593 594static int validate_actions(const struct nlattr *attr, 595 const struct sw_flow_key *key, int depth) 596{ 597 const struct nlattr *a; 598 int rem, err; 599 600 if (depth >= SAMPLE_ACTION_DEPTH) 601 return -EOVERFLOW; 602 603 nla_for_each_nested(a, attr, rem) { 604 /* Expected argument lengths, (u32)-1 for variable length. */ 605 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = { 606 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32), 607 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1, 608 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan), 609 [OVS_ACTION_ATTR_POP_VLAN] = 0, 610 [OVS_ACTION_ATTR_SET] = (u32)-1, 611 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1 612 }; 613 const struct ovs_action_push_vlan *vlan; 614 int type = nla_type(a); 615 616 if (type > OVS_ACTION_ATTR_MAX || 617 (action_lens[type] != nla_len(a) && 618 action_lens[type] != (u32)-1)) 619 return -EINVAL; 620 621 switch (type) { 622 case OVS_ACTION_ATTR_UNSPEC: 623 return -EINVAL; 624 625 case OVS_ACTION_ATTR_USERSPACE: 626 err = validate_userspace(a); 627 if (err) 628 return err; 629 break; 630 631 case OVS_ACTION_ATTR_OUTPUT: 632 if (nla_get_u32(a) >= DP_MAX_PORTS) 633 return -EINVAL; 634 break; 635 636 637 case OVS_ACTION_ATTR_POP_VLAN: 638 break; 639 640 case OVS_ACTION_ATTR_PUSH_VLAN: 641 vlan = nla_data(a); 642 if (vlan->vlan_tpid != htons(ETH_P_8021Q)) 643 return -EINVAL; 644 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT))) 645 return -EINVAL; 646 break; 647 648 case OVS_ACTION_ATTR_SET: 649 err = validate_set(a, key); 650 if (err) 651 return err; 652 break; 653 654 case OVS_ACTION_ATTR_SAMPLE: 655 err = validate_sample(a, key, depth); 656 if (err) 657 return err; 658 break; 659 660 default: 661 return -EINVAL; 662 } 663 } 664 665 if (rem > 0) 666 return -EINVAL; 667 668 return 0; 669} 670 671static void clear_stats(struct sw_flow *flow) 672{ 673 flow->used = 0; 674 flow->tcp_flags = 0; 675 flow->packet_count = 0; 676 flow->byte_count = 0; 677} 678 679static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 680{ 681 struct ovs_header *ovs_header = info->userhdr; 682 struct nlattr **a = info->attrs; 683 struct sw_flow_actions *acts; 684 struct sk_buff *packet; 685 struct sw_flow *flow; 686 struct datapath *dp; 687 struct ethhdr *eth; 688 int len; 689 int err; 690 int key_len; 691 692 err = -EINVAL; 693 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 694 !a[OVS_PACKET_ATTR_ACTIONS]) 695 goto err; 696 697 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 698 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 699 err = -ENOMEM; 700 if (!packet) 701 goto err; 702 skb_reserve(packet, NET_IP_ALIGN); 703 704 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 705 706 skb_reset_mac_header(packet); 707 eth = eth_hdr(packet); 708 709 /* Normally, setting the skb 'protocol' field would be handled by a 710 * call to eth_type_trans(), but it assumes there's a sending 711 * device, which we may not have. */ 712 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) 713 packet->protocol = eth->h_proto; 714 else 715 packet->protocol = htons(ETH_P_802_2); 716 717 /* Build an sw_flow for sending this packet. */ 718 flow = ovs_flow_alloc(); 719 err = PTR_ERR(flow); 720 if (IS_ERR(flow)) 721 goto err_kfree_skb; 722 723 err = ovs_flow_extract(packet, -1, &flow->key, &key_len); 724 if (err) 725 goto err_flow_free; 726 727 err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority, 728 &flow->key.phy.skb_mark, 729 &flow->key.phy.in_port, 730 a[OVS_PACKET_ATTR_KEY]); 731 if (err) 732 goto err_flow_free; 733 734 err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0); 735 if (err) 736 goto err_flow_free; 737 738 flow->hash = ovs_flow_hash(&flow->key, key_len); 739 740 acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]); 741 err = PTR_ERR(acts); 742 if (IS_ERR(acts)) 743 goto err_flow_free; 744 rcu_assign_pointer(flow->sf_acts, acts); 745 746 OVS_CB(packet)->flow = flow; 747 packet->priority = flow->key.phy.priority; 748 packet->mark = flow->key.phy.skb_mark; 749 750 rcu_read_lock(); 751 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 752 err = -ENODEV; 753 if (!dp) 754 goto err_unlock; 755 756 local_bh_disable(); 757 err = ovs_execute_actions(dp, packet); 758 local_bh_enable(); 759 rcu_read_unlock(); 760 761 ovs_flow_free(flow); 762 return err; 763 764err_unlock: 765 rcu_read_unlock(); 766err_flow_free: 767 ovs_flow_free(flow); 768err_kfree_skb: 769 kfree_skb(packet); 770err: 771 return err; 772} 773 774static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 775 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 776 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 777 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 778}; 779 780static struct genl_ops dp_packet_genl_ops[] = { 781 { .cmd = OVS_PACKET_CMD_EXECUTE, 782 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 783 .policy = packet_policy, 784 .doit = ovs_packet_cmd_execute 785 } 786}; 787 788static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats) 789{ 790 int i; 791 struct flow_table *table = genl_dereference(dp->table); 792 793 stats->n_flows = ovs_flow_tbl_count(table); 794 795 stats->n_hit = stats->n_missed = stats->n_lost = 0; 796 for_each_possible_cpu(i) { 797 const struct dp_stats_percpu *percpu_stats; 798 struct dp_stats_percpu local_stats; 799 unsigned int start; 800 801 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 802 803 do { 804 start = u64_stats_fetch_begin_bh(&percpu_stats->sync); 805 local_stats = *percpu_stats; 806 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start)); 807 808 stats->n_hit += local_stats.n_hit; 809 stats->n_missed += local_stats.n_missed; 810 stats->n_lost += local_stats.n_lost; 811 } 812} 813 814static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 815 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 816 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 817 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 818}; 819 820static struct genl_family dp_flow_genl_family = { 821 .id = GENL_ID_GENERATE, 822 .hdrsize = sizeof(struct ovs_header), 823 .name = OVS_FLOW_FAMILY, 824 .version = OVS_FLOW_VERSION, 825 .maxattr = OVS_FLOW_ATTR_MAX, 826 .netnsok = true 827}; 828 829static struct genl_multicast_group ovs_dp_flow_multicast_group = { 830 .name = OVS_FLOW_MCGROUP 831}; 832 833static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts) 834{ 835 return NLMSG_ALIGN(sizeof(struct ovs_header)) 836 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */ 837 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 838 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 839 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */ 840 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */ 841} 842 843/* Called with genl_lock. */ 844static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp, 845 struct sk_buff *skb, u32 portid, 846 u32 seq, u32 flags, u8 cmd) 847{ 848 const int skb_orig_len = skb->len; 849 const struct sw_flow_actions *sf_acts; 850 struct ovs_flow_stats stats; 851 struct ovs_header *ovs_header; 852 struct nlattr *nla; 853 unsigned long used; 854 u8 tcp_flags; 855 int err; 856 857 sf_acts = rcu_dereference_protected(flow->sf_acts, 858 lockdep_genl_is_held()); 859 860 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd); 861 if (!ovs_header) 862 return -EMSGSIZE; 863 864 ovs_header->dp_ifindex = get_dpifindex(dp); 865 866 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY); 867 if (!nla) 868 goto nla_put_failure; 869 err = ovs_flow_to_nlattrs(&flow->key, skb); 870 if (err) 871 goto error; 872 nla_nest_end(skb, nla); 873 874 spin_lock_bh(&flow->lock); 875 used = flow->used; 876 stats.n_packets = flow->packet_count; 877 stats.n_bytes = flow->byte_count; 878 tcp_flags = flow->tcp_flags; 879 spin_unlock_bh(&flow->lock); 880 881 if (used && 882 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used))) 883 goto nla_put_failure; 884 885 if (stats.n_packets && 886 nla_put(skb, OVS_FLOW_ATTR_STATS, 887 sizeof(struct ovs_flow_stats), &stats)) 888 goto nla_put_failure; 889 890 if (tcp_flags && 891 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags)) 892 goto nla_put_failure; 893 894 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 895 * this is the first flow to be dumped into 'skb'. This is unusual for 896 * Netlink but individual action lists can be longer than 897 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 898 * The userspace caller can always fetch the actions separately if it 899 * really wants them. (Most userspace callers in fact don't care.) 900 * 901 * This can only fail for dump operations because the skb is always 902 * properly sized for single flows. 903 */ 904 err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len, 905 sf_acts->actions); 906 if (err < 0 && skb_orig_len) 907 goto error; 908 909 return genlmsg_end(skb, ovs_header); 910 911nla_put_failure: 912 err = -EMSGSIZE; 913error: 914 genlmsg_cancel(skb, ovs_header); 915 return err; 916} 917 918static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow) 919{ 920 const struct sw_flow_actions *sf_acts; 921 922 sf_acts = rcu_dereference_protected(flow->sf_acts, 923 lockdep_genl_is_held()); 924 925 return genlmsg_new(ovs_flow_cmd_msg_size(sf_acts), GFP_KERNEL); 926} 927 928static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow, 929 struct datapath *dp, 930 u32 portid, u32 seq, u8 cmd) 931{ 932 struct sk_buff *skb; 933 int retval; 934 935 skb = ovs_flow_cmd_alloc_info(flow); 936 if (!skb) 937 return ERR_PTR(-ENOMEM); 938 939 retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd); 940 BUG_ON(retval < 0); 941 return skb; 942} 943 944static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info) 945{ 946 struct nlattr **a = info->attrs; 947 struct ovs_header *ovs_header = info->userhdr; 948 struct sw_flow_key key; 949 struct sw_flow *flow; 950 struct sk_buff *reply; 951 struct datapath *dp; 952 struct flow_table *table; 953 int error; 954 int key_len; 955 956 /* Extract key. */ 957 error = -EINVAL; 958 if (!a[OVS_FLOW_ATTR_KEY]) 959 goto error; 960 error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); 961 if (error) 962 goto error; 963 964 /* Validate actions. */ 965 if (a[OVS_FLOW_ATTR_ACTIONS]) { 966 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0); 967 if (error) 968 goto error; 969 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) { 970 error = -EINVAL; 971 goto error; 972 } 973 974 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 975 error = -ENODEV; 976 if (!dp) 977 goto error; 978 979 table = genl_dereference(dp->table); 980 flow = ovs_flow_tbl_lookup(table, &key, key_len); 981 if (!flow) { 982 struct sw_flow_actions *acts; 983 984 /* Bail out if we're not allowed to create a new flow. */ 985 error = -ENOENT; 986 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET) 987 goto error; 988 989 /* Expand table, if necessary, to make room. */ 990 if (ovs_flow_tbl_need_to_expand(table)) { 991 struct flow_table *new_table; 992 993 new_table = ovs_flow_tbl_expand(table); 994 if (!IS_ERR(new_table)) { 995 rcu_assign_pointer(dp->table, new_table); 996 ovs_flow_tbl_deferred_destroy(table); 997 table = genl_dereference(dp->table); 998 } 999 } 1000 1001 /* Allocate flow. */ 1002 flow = ovs_flow_alloc(); 1003 if (IS_ERR(flow)) { 1004 error = PTR_ERR(flow); 1005 goto error; 1006 } 1007 flow->key = key; 1008 clear_stats(flow); 1009 1010 /* Obtain actions. */ 1011 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]); 1012 error = PTR_ERR(acts); 1013 if (IS_ERR(acts)) 1014 goto error_free_flow; 1015 rcu_assign_pointer(flow->sf_acts, acts); 1016 1017 /* Put flow in bucket. */ 1018 flow->hash = ovs_flow_hash(&key, key_len); 1019 ovs_flow_tbl_insert(table, flow); 1020 1021 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, 1022 info->snd_seq, 1023 OVS_FLOW_CMD_NEW); 1024 } else { 1025 /* We found a matching flow. */ 1026 struct sw_flow_actions *old_acts; 1027 struct nlattr *acts_attrs; 1028 1029 /* Bail out if we're not allowed to modify an existing flow. 1030 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 1031 * because Generic Netlink treats the latter as a dump 1032 * request. We also accept NLM_F_EXCL in case that bug ever 1033 * gets fixed. 1034 */ 1035 error = -EEXIST; 1036 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW && 1037 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL)) 1038 goto error; 1039 1040 /* Update actions. */ 1041 old_acts = rcu_dereference_protected(flow->sf_acts, 1042 lockdep_genl_is_held()); 1043 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS]; 1044 if (acts_attrs && 1045 (old_acts->actions_len != nla_len(acts_attrs) || 1046 memcmp(old_acts->actions, nla_data(acts_attrs), 1047 old_acts->actions_len))) { 1048 struct sw_flow_actions *new_acts; 1049 1050 new_acts = ovs_flow_actions_alloc(acts_attrs); 1051 error = PTR_ERR(new_acts); 1052 if (IS_ERR(new_acts)) 1053 goto error; 1054 1055 rcu_assign_pointer(flow->sf_acts, new_acts); 1056 ovs_flow_deferred_free_acts(old_acts); 1057 } 1058 1059 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, 1060 info->snd_seq, OVS_FLOW_CMD_NEW); 1061 1062 /* Clear stats. */ 1063 if (a[OVS_FLOW_ATTR_CLEAR]) { 1064 spin_lock_bh(&flow->lock); 1065 clear_stats(flow); 1066 spin_unlock_bh(&flow->lock); 1067 } 1068 } 1069 1070 if (!IS_ERR(reply)) 1071 ovs_notify(reply, info, &ovs_dp_flow_multicast_group); 1072 else 1073 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 1074 ovs_dp_flow_multicast_group.id, PTR_ERR(reply)); 1075 return 0; 1076 1077error_free_flow: 1078 ovs_flow_free(flow); 1079error: 1080 return error; 1081} 1082 1083static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1084{ 1085 struct nlattr **a = info->attrs; 1086 struct ovs_header *ovs_header = info->userhdr; 1087 struct sw_flow_key key; 1088 struct sk_buff *reply; 1089 struct sw_flow *flow; 1090 struct datapath *dp; 1091 struct flow_table *table; 1092 int err; 1093 int key_len; 1094 1095 if (!a[OVS_FLOW_ATTR_KEY]) 1096 return -EINVAL; 1097 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); 1098 if (err) 1099 return err; 1100 1101 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1102 if (!dp) 1103 return -ENODEV; 1104 1105 table = genl_dereference(dp->table); 1106 flow = ovs_flow_tbl_lookup(table, &key, key_len); 1107 if (!flow) 1108 return -ENOENT; 1109 1110 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, 1111 info->snd_seq, OVS_FLOW_CMD_NEW); 1112 if (IS_ERR(reply)) 1113 return PTR_ERR(reply); 1114 1115 return genlmsg_reply(reply, info); 1116} 1117 1118static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1119{ 1120 struct nlattr **a = info->attrs; 1121 struct ovs_header *ovs_header = info->userhdr; 1122 struct sw_flow_key key; 1123 struct sk_buff *reply; 1124 struct sw_flow *flow; 1125 struct datapath *dp; 1126 struct flow_table *table; 1127 int err; 1128 int key_len; 1129 1130 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1131 if (!dp) 1132 return -ENODEV; 1133 1134 if (!a[OVS_FLOW_ATTR_KEY]) 1135 return flush_flows(dp); 1136 1137 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); 1138 if (err) 1139 return err; 1140 1141 table = genl_dereference(dp->table); 1142 flow = ovs_flow_tbl_lookup(table, &key, key_len); 1143 if (!flow) 1144 return -ENOENT; 1145 1146 reply = ovs_flow_cmd_alloc_info(flow); 1147 if (!reply) 1148 return -ENOMEM; 1149 1150 ovs_flow_tbl_remove(table, flow); 1151 1152 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid, 1153 info->snd_seq, 0, OVS_FLOW_CMD_DEL); 1154 BUG_ON(err < 0); 1155 1156 ovs_flow_deferred_free(flow); 1157 1158 ovs_notify(reply, info, &ovs_dp_flow_multicast_group); 1159 return 0; 1160} 1161 1162static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1163{ 1164 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1165 struct datapath *dp; 1166 struct flow_table *table; 1167 1168 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1169 if (!dp) 1170 return -ENODEV; 1171 1172 table = genl_dereference(dp->table); 1173 1174 for (;;) { 1175 struct sw_flow *flow; 1176 u32 bucket, obj; 1177 1178 bucket = cb->args[0]; 1179 obj = cb->args[1]; 1180 flow = ovs_flow_tbl_next(table, &bucket, &obj); 1181 if (!flow) 1182 break; 1183 1184 if (ovs_flow_cmd_fill_info(flow, dp, skb, 1185 NETLINK_CB(cb->skb).portid, 1186 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1187 OVS_FLOW_CMD_NEW) < 0) 1188 break; 1189 1190 cb->args[0] = bucket; 1191 cb->args[1] = obj; 1192 } 1193 return skb->len; 1194} 1195 1196static struct genl_ops dp_flow_genl_ops[] = { 1197 { .cmd = OVS_FLOW_CMD_NEW, 1198 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1199 .policy = flow_policy, 1200 .doit = ovs_flow_cmd_new_or_set 1201 }, 1202 { .cmd = OVS_FLOW_CMD_DEL, 1203 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1204 .policy = flow_policy, 1205 .doit = ovs_flow_cmd_del 1206 }, 1207 { .cmd = OVS_FLOW_CMD_GET, 1208 .flags = 0, /* OK for unprivileged users. */ 1209 .policy = flow_policy, 1210 .doit = ovs_flow_cmd_get, 1211 .dumpit = ovs_flow_cmd_dump 1212 }, 1213 { .cmd = OVS_FLOW_CMD_SET, 1214 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1215 .policy = flow_policy, 1216 .doit = ovs_flow_cmd_new_or_set, 1217 }, 1218}; 1219 1220static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1221 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1222 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1223}; 1224 1225static struct genl_family dp_datapath_genl_family = { 1226 .id = GENL_ID_GENERATE, 1227 .hdrsize = sizeof(struct ovs_header), 1228 .name = OVS_DATAPATH_FAMILY, 1229 .version = OVS_DATAPATH_VERSION, 1230 .maxattr = OVS_DP_ATTR_MAX, 1231 .netnsok = true 1232}; 1233 1234static struct genl_multicast_group ovs_dp_datapath_multicast_group = { 1235 .name = OVS_DATAPATH_MCGROUP 1236}; 1237 1238static size_t ovs_dp_cmd_msg_size(void) 1239{ 1240 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1241 1242 msgsize += nla_total_size(IFNAMSIZ); 1243 msgsize += nla_total_size(sizeof(struct ovs_dp_stats)); 1244 1245 return msgsize; 1246} 1247 1248static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1249 u32 portid, u32 seq, u32 flags, u8 cmd) 1250{ 1251 struct ovs_header *ovs_header; 1252 struct ovs_dp_stats dp_stats; 1253 int err; 1254 1255 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1256 flags, cmd); 1257 if (!ovs_header) 1258 goto error; 1259 1260 ovs_header->dp_ifindex = get_dpifindex(dp); 1261 1262 rcu_read_lock(); 1263 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1264 rcu_read_unlock(); 1265 if (err) 1266 goto nla_put_failure; 1267 1268 get_dp_stats(dp, &dp_stats); 1269 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats)) 1270 goto nla_put_failure; 1271 1272 return genlmsg_end(skb, ovs_header); 1273 1274nla_put_failure: 1275 genlmsg_cancel(skb, ovs_header); 1276error: 1277 return -EMSGSIZE; 1278} 1279 1280static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid, 1281 u32 seq, u8 cmd) 1282{ 1283 struct sk_buff *skb; 1284 int retval; 1285 1286 skb = genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL); 1287 if (!skb) 1288 return ERR_PTR(-ENOMEM); 1289 1290 retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd); 1291 if (retval < 0) { 1292 kfree_skb(skb); 1293 return ERR_PTR(retval); 1294 } 1295 return skb; 1296} 1297 1298/* Called with genl_mutex and optionally with RTNL lock also. */ 1299static struct datapath *lookup_datapath(struct net *net, 1300 struct ovs_header *ovs_header, 1301 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1302{ 1303 struct datapath *dp; 1304 1305 if (!a[OVS_DP_ATTR_NAME]) 1306 dp = get_dp(net, ovs_header->dp_ifindex); 1307 else { 1308 struct vport *vport; 1309 1310 rcu_read_lock(); 1311 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1312 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1313 rcu_read_unlock(); 1314 } 1315 return dp ? dp : ERR_PTR(-ENODEV); 1316} 1317 1318static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1319{ 1320 struct nlattr **a = info->attrs; 1321 struct vport_parms parms; 1322 struct sk_buff *reply; 1323 struct datapath *dp; 1324 struct vport *vport; 1325 struct ovs_net *ovs_net; 1326 int err, i; 1327 1328 err = -EINVAL; 1329 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1330 goto err; 1331 1332 rtnl_lock(); 1333 1334 err = -ENOMEM; 1335 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1336 if (dp == NULL) 1337 goto err_unlock_rtnl; 1338 1339 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk))); 1340 1341 /* Allocate table. */ 1342 err = -ENOMEM; 1343 rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS)); 1344 if (!dp->table) 1345 goto err_free_dp; 1346 1347 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu); 1348 if (!dp->stats_percpu) { 1349 err = -ENOMEM; 1350 goto err_destroy_table; 1351 } 1352 1353 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head), 1354 GFP_KERNEL); 1355 if (!dp->ports) { 1356 err = -ENOMEM; 1357 goto err_destroy_percpu; 1358 } 1359 1360 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1361 INIT_HLIST_HEAD(&dp->ports[i]); 1362 1363 /* Set up our datapath device. */ 1364 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1365 parms.type = OVS_VPORT_TYPE_INTERNAL; 1366 parms.options = NULL; 1367 parms.dp = dp; 1368 parms.port_no = OVSP_LOCAL; 1369 parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]); 1370 1371 vport = new_vport(&parms); 1372 if (IS_ERR(vport)) { 1373 err = PTR_ERR(vport); 1374 if (err == -EBUSY) 1375 err = -EEXIST; 1376 1377 goto err_destroy_ports_array; 1378 } 1379 1380 reply = ovs_dp_cmd_build_info(dp, info->snd_portid, 1381 info->snd_seq, OVS_DP_CMD_NEW); 1382 err = PTR_ERR(reply); 1383 if (IS_ERR(reply)) 1384 goto err_destroy_local_port; 1385 1386 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1387 list_add_tail(&dp->list_node, &ovs_net->dps); 1388 rtnl_unlock(); 1389 1390 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group); 1391 return 0; 1392 1393err_destroy_local_port: 1394 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL)); 1395err_destroy_ports_array: 1396 kfree(dp->ports); 1397err_destroy_percpu: 1398 free_percpu(dp->stats_percpu); 1399err_destroy_table: 1400 ovs_flow_tbl_destroy(genl_dereference(dp->table)); 1401err_free_dp: 1402 release_net(ovs_dp_get_net(dp)); 1403 kfree(dp); 1404err_unlock_rtnl: 1405 rtnl_unlock(); 1406err: 1407 return err; 1408} 1409 1410/* Called with genl_mutex. */ 1411static void __dp_destroy(struct datapath *dp) 1412{ 1413 int i; 1414 1415 rtnl_lock(); 1416 1417 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1418 struct vport *vport; 1419 struct hlist_node *n; 1420 1421 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1422 if (vport->port_no != OVSP_LOCAL) 1423 ovs_dp_detach_port(vport); 1424 } 1425 1426 list_del(&dp->list_node); 1427 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL)); 1428 1429 /* rtnl_unlock() will wait until all the references to devices that 1430 * are pending unregistration have been dropped. We do it here to 1431 * ensure that any internal devices (which contain DP pointers) are 1432 * fully destroyed before freeing the datapath. 1433 */ 1434 rtnl_unlock(); 1435 1436 call_rcu(&dp->rcu, destroy_dp_rcu); 1437} 1438 1439static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1440{ 1441 struct sk_buff *reply; 1442 struct datapath *dp; 1443 int err; 1444 1445 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1446 err = PTR_ERR(dp); 1447 if (IS_ERR(dp)) 1448 return err; 1449 1450 reply = ovs_dp_cmd_build_info(dp, info->snd_portid, 1451 info->snd_seq, OVS_DP_CMD_DEL); 1452 err = PTR_ERR(reply); 1453 if (IS_ERR(reply)) 1454 return err; 1455 1456 __dp_destroy(dp); 1457 1458 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group); 1459 1460 return 0; 1461} 1462 1463static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1464{ 1465 struct sk_buff *reply; 1466 struct datapath *dp; 1467 int err; 1468 1469 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1470 if (IS_ERR(dp)) 1471 return PTR_ERR(dp); 1472 1473 reply = ovs_dp_cmd_build_info(dp, info->snd_portid, 1474 info->snd_seq, OVS_DP_CMD_NEW); 1475 if (IS_ERR(reply)) { 1476 err = PTR_ERR(reply); 1477 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 1478 ovs_dp_datapath_multicast_group.id, err); 1479 return 0; 1480 } 1481 1482 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group); 1483 1484 return 0; 1485} 1486 1487static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1488{ 1489 struct sk_buff *reply; 1490 struct datapath *dp; 1491 1492 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1493 if (IS_ERR(dp)) 1494 return PTR_ERR(dp); 1495 1496 reply = ovs_dp_cmd_build_info(dp, info->snd_portid, 1497 info->snd_seq, OVS_DP_CMD_NEW); 1498 if (IS_ERR(reply)) 1499 return PTR_ERR(reply); 1500 1501 return genlmsg_reply(reply, info); 1502} 1503 1504static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1505{ 1506 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1507 struct datapath *dp; 1508 int skip = cb->args[0]; 1509 int i = 0; 1510 1511 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1512 if (i >= skip && 1513 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1514 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1515 OVS_DP_CMD_NEW) < 0) 1516 break; 1517 i++; 1518 } 1519 1520 cb->args[0] = i; 1521 1522 return skb->len; 1523} 1524 1525static struct genl_ops dp_datapath_genl_ops[] = { 1526 { .cmd = OVS_DP_CMD_NEW, 1527 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1528 .policy = datapath_policy, 1529 .doit = ovs_dp_cmd_new 1530 }, 1531 { .cmd = OVS_DP_CMD_DEL, 1532 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1533 .policy = datapath_policy, 1534 .doit = ovs_dp_cmd_del 1535 }, 1536 { .cmd = OVS_DP_CMD_GET, 1537 .flags = 0, /* OK for unprivileged users. */ 1538 .policy = datapath_policy, 1539 .doit = ovs_dp_cmd_get, 1540 .dumpit = ovs_dp_cmd_dump 1541 }, 1542 { .cmd = OVS_DP_CMD_SET, 1543 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1544 .policy = datapath_policy, 1545 .doit = ovs_dp_cmd_set, 1546 }, 1547}; 1548 1549static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 1550 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1551 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 1552 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 1553 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 1554 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1555 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 1556}; 1557 1558static struct genl_family dp_vport_genl_family = { 1559 .id = GENL_ID_GENERATE, 1560 .hdrsize = sizeof(struct ovs_header), 1561 .name = OVS_VPORT_FAMILY, 1562 .version = OVS_VPORT_VERSION, 1563 .maxattr = OVS_VPORT_ATTR_MAX, 1564 .netnsok = true 1565}; 1566 1567struct genl_multicast_group ovs_dp_vport_multicast_group = { 1568 .name = OVS_VPORT_MCGROUP 1569}; 1570 1571/* Called with RTNL lock or RCU read lock. */ 1572static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1573 u32 portid, u32 seq, u32 flags, u8 cmd) 1574{ 1575 struct ovs_header *ovs_header; 1576 struct ovs_vport_stats vport_stats; 1577 int err; 1578 1579 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1580 flags, cmd); 1581 if (!ovs_header) 1582 return -EMSGSIZE; 1583 1584 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1585 1586 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1587 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1588 nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) || 1589 nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid)) 1590 goto nla_put_failure; 1591 1592 ovs_vport_get_stats(vport, &vport_stats); 1593 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), 1594 &vport_stats)) 1595 goto nla_put_failure; 1596 1597 err = ovs_vport_get_options(vport, skb); 1598 if (err == -EMSGSIZE) 1599 goto error; 1600 1601 return genlmsg_end(skb, ovs_header); 1602 1603nla_put_failure: 1604 err = -EMSGSIZE; 1605error: 1606 genlmsg_cancel(skb, ovs_header); 1607 return err; 1608} 1609 1610/* Called with RTNL lock or RCU read lock. */ 1611struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid, 1612 u32 seq, u8 cmd) 1613{ 1614 struct sk_buff *skb; 1615 int retval; 1616 1617 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1618 if (!skb) 1619 return ERR_PTR(-ENOMEM); 1620 1621 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd); 1622 if (retval < 0) { 1623 kfree_skb(skb); 1624 return ERR_PTR(retval); 1625 } 1626 return skb; 1627} 1628 1629/* Called with RTNL lock or RCU read lock. */ 1630static struct vport *lookup_vport(struct net *net, 1631 struct ovs_header *ovs_header, 1632 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1633{ 1634 struct datapath *dp; 1635 struct vport *vport; 1636 1637 if (a[OVS_VPORT_ATTR_NAME]) { 1638 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 1639 if (!vport) 1640 return ERR_PTR(-ENODEV); 1641 if (ovs_header->dp_ifindex && 1642 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 1643 return ERR_PTR(-ENODEV); 1644 return vport; 1645 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 1646 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1647 1648 if (port_no >= DP_MAX_PORTS) 1649 return ERR_PTR(-EFBIG); 1650 1651 dp = get_dp(net, ovs_header->dp_ifindex); 1652 if (!dp) 1653 return ERR_PTR(-ENODEV); 1654 1655 vport = ovs_vport_rtnl_rcu(dp, port_no); 1656 if (!vport) 1657 return ERR_PTR(-ENODEV); 1658 return vport; 1659 } else 1660 return ERR_PTR(-EINVAL); 1661} 1662 1663static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 1664{ 1665 struct nlattr **a = info->attrs; 1666 struct ovs_header *ovs_header = info->userhdr; 1667 struct vport_parms parms; 1668 struct sk_buff *reply; 1669 struct vport *vport; 1670 struct datapath *dp; 1671 u32 port_no; 1672 int err; 1673 1674 err = -EINVAL; 1675 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 1676 !a[OVS_VPORT_ATTR_UPCALL_PID]) 1677 goto exit; 1678 1679 rtnl_lock(); 1680 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1681 err = -ENODEV; 1682 if (!dp) 1683 goto exit_unlock; 1684 1685 if (a[OVS_VPORT_ATTR_PORT_NO]) { 1686 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1687 1688 err = -EFBIG; 1689 if (port_no >= DP_MAX_PORTS) 1690 goto exit_unlock; 1691 1692 vport = ovs_vport_rtnl_rcu(dp, port_no); 1693 err = -EBUSY; 1694 if (vport) 1695 goto exit_unlock; 1696 } else { 1697 for (port_no = 1; ; port_no++) { 1698 if (port_no >= DP_MAX_PORTS) { 1699 err = -EFBIG; 1700 goto exit_unlock; 1701 } 1702 vport = ovs_vport_rtnl(dp, port_no); 1703 if (!vport) 1704 break; 1705 } 1706 } 1707 1708 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 1709 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 1710 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 1711 parms.dp = dp; 1712 parms.port_no = port_no; 1713 parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); 1714 1715 vport = new_vport(&parms); 1716 err = PTR_ERR(vport); 1717 if (IS_ERR(vport)) 1718 goto exit_unlock; 1719 1720 err = 0; 1721 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, 1722 OVS_VPORT_CMD_NEW); 1723 if (IS_ERR(reply)) { 1724 err = PTR_ERR(reply); 1725 ovs_dp_detach_port(vport); 1726 goto exit_unlock; 1727 } 1728 1729 ovs_notify(reply, info, &ovs_dp_vport_multicast_group); 1730 1731exit_unlock: 1732 rtnl_unlock(); 1733exit: 1734 return err; 1735} 1736 1737static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 1738{ 1739 struct nlattr **a = info->attrs; 1740 struct sk_buff *reply; 1741 struct vport *vport; 1742 int err; 1743 1744 rtnl_lock(); 1745 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1746 err = PTR_ERR(vport); 1747 if (IS_ERR(vport)) 1748 goto exit_unlock; 1749 1750 err = 0; 1751 if (a[OVS_VPORT_ATTR_TYPE] && 1752 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) 1753 err = -EINVAL; 1754 1755 if (!err && a[OVS_VPORT_ATTR_OPTIONS]) 1756 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 1757 if (err) 1758 goto exit_unlock; 1759 if (a[OVS_VPORT_ATTR_UPCALL_PID]) 1760 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); 1761 1762 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, 1763 OVS_VPORT_CMD_NEW); 1764 if (IS_ERR(reply)) { 1765 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 1766 ovs_dp_vport_multicast_group.id, PTR_ERR(reply)); 1767 goto exit_unlock; 1768 } 1769 1770 ovs_notify(reply, info, &ovs_dp_vport_multicast_group); 1771 1772exit_unlock: 1773 rtnl_unlock(); 1774 return err; 1775} 1776 1777static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 1778{ 1779 struct nlattr **a = info->attrs; 1780 struct sk_buff *reply; 1781 struct vport *vport; 1782 int err; 1783 1784 rtnl_lock(); 1785 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1786 err = PTR_ERR(vport); 1787 if (IS_ERR(vport)) 1788 goto exit_unlock; 1789 1790 if (vport->port_no == OVSP_LOCAL) { 1791 err = -EINVAL; 1792 goto exit_unlock; 1793 } 1794 1795 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, 1796 OVS_VPORT_CMD_DEL); 1797 err = PTR_ERR(reply); 1798 if (IS_ERR(reply)) 1799 goto exit_unlock; 1800 1801 err = 0; 1802 ovs_dp_detach_port(vport); 1803 1804 ovs_notify(reply, info, &ovs_dp_vport_multicast_group); 1805 1806exit_unlock: 1807 rtnl_unlock(); 1808 return err; 1809} 1810 1811static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 1812{ 1813 struct nlattr **a = info->attrs; 1814 struct ovs_header *ovs_header = info->userhdr; 1815 struct sk_buff *reply; 1816 struct vport *vport; 1817 int err; 1818 1819 rcu_read_lock(); 1820 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 1821 err = PTR_ERR(vport); 1822 if (IS_ERR(vport)) 1823 goto exit_unlock; 1824 1825 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, 1826 OVS_VPORT_CMD_NEW); 1827 err = PTR_ERR(reply); 1828 if (IS_ERR(reply)) 1829 goto exit_unlock; 1830 1831 rcu_read_unlock(); 1832 1833 return genlmsg_reply(reply, info); 1834 1835exit_unlock: 1836 rcu_read_unlock(); 1837 return err; 1838} 1839 1840static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1841{ 1842 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1843 struct datapath *dp; 1844 int bucket = cb->args[0], skip = cb->args[1]; 1845 int i, j = 0; 1846 1847 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1848 if (!dp) 1849 return -ENODEV; 1850 1851 rcu_read_lock(); 1852 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 1853 struct vport *vport; 1854 1855 j = 0; 1856 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 1857 if (j >= skip && 1858 ovs_vport_cmd_fill_info(vport, skb, 1859 NETLINK_CB(cb->skb).portid, 1860 cb->nlh->nlmsg_seq, 1861 NLM_F_MULTI, 1862 OVS_VPORT_CMD_NEW) < 0) 1863 goto out; 1864 1865 j++; 1866 } 1867 skip = 0; 1868 } 1869out: 1870 rcu_read_unlock(); 1871 1872 cb->args[0] = i; 1873 cb->args[1] = j; 1874 1875 return skb->len; 1876} 1877 1878static struct genl_ops dp_vport_genl_ops[] = { 1879 { .cmd = OVS_VPORT_CMD_NEW, 1880 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1881 .policy = vport_policy, 1882 .doit = ovs_vport_cmd_new 1883 }, 1884 { .cmd = OVS_VPORT_CMD_DEL, 1885 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1886 .policy = vport_policy, 1887 .doit = ovs_vport_cmd_del 1888 }, 1889 { .cmd = OVS_VPORT_CMD_GET, 1890 .flags = 0, /* OK for unprivileged users. */ 1891 .policy = vport_policy, 1892 .doit = ovs_vport_cmd_get, 1893 .dumpit = ovs_vport_cmd_dump 1894 }, 1895 { .cmd = OVS_VPORT_CMD_SET, 1896 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1897 .policy = vport_policy, 1898 .doit = ovs_vport_cmd_set, 1899 }, 1900}; 1901 1902struct genl_family_and_ops { 1903 struct genl_family *family; 1904 struct genl_ops *ops; 1905 int n_ops; 1906 struct genl_multicast_group *group; 1907}; 1908 1909static const struct genl_family_and_ops dp_genl_families[] = { 1910 { &dp_datapath_genl_family, 1911 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops), 1912 &ovs_dp_datapath_multicast_group }, 1913 { &dp_vport_genl_family, 1914 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops), 1915 &ovs_dp_vport_multicast_group }, 1916 { &dp_flow_genl_family, 1917 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops), 1918 &ovs_dp_flow_multicast_group }, 1919 { &dp_packet_genl_family, 1920 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops), 1921 NULL }, 1922}; 1923 1924static void dp_unregister_genl(int n_families) 1925{ 1926 int i; 1927 1928 for (i = 0; i < n_families; i++) 1929 genl_unregister_family(dp_genl_families[i].family); 1930} 1931 1932static int dp_register_genl(void) 1933{ 1934 int n_registered; 1935 int err; 1936 int i; 1937 1938 n_registered = 0; 1939 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 1940 const struct genl_family_and_ops *f = &dp_genl_families[i]; 1941 1942 err = genl_register_family_with_ops(f->family, f->ops, 1943 f->n_ops); 1944 if (err) 1945 goto error; 1946 n_registered++; 1947 1948 if (f->group) { 1949 err = genl_register_mc_group(f->family, f->group); 1950 if (err) 1951 goto error; 1952 } 1953 } 1954 1955 return 0; 1956 1957error: 1958 dp_unregister_genl(n_registered); 1959 return err; 1960} 1961 1962static void rehash_flow_table(struct work_struct *work) 1963{ 1964 struct datapath *dp; 1965 struct net *net; 1966 1967 genl_lock(); 1968 rtnl_lock(); 1969 for_each_net(net) { 1970 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1971 1972 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1973 struct flow_table *old_table = genl_dereference(dp->table); 1974 struct flow_table *new_table; 1975 1976 new_table = ovs_flow_tbl_rehash(old_table); 1977 if (!IS_ERR(new_table)) { 1978 rcu_assign_pointer(dp->table, new_table); 1979 ovs_flow_tbl_deferred_destroy(old_table); 1980 } 1981 } 1982 } 1983 rtnl_unlock(); 1984 genl_unlock(); 1985 1986 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); 1987} 1988 1989static int __net_init ovs_init_net(struct net *net) 1990{ 1991 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1992 1993 INIT_LIST_HEAD(&ovs_net->dps); 1994 return 0; 1995} 1996 1997static void __net_exit ovs_exit_net(struct net *net) 1998{ 1999 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2000 struct datapath *dp, *dp_next; 2001 2002 genl_lock(); 2003 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2004 __dp_destroy(dp); 2005 genl_unlock(); 2006} 2007 2008static struct pernet_operations ovs_net_ops = { 2009 .init = ovs_init_net, 2010 .exit = ovs_exit_net, 2011 .id = &ovs_net_id, 2012 .size = sizeof(struct ovs_net), 2013}; 2014 2015static int __init dp_init(void) 2016{ 2017 int err; 2018 2019 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); 2020 2021 pr_info("Open vSwitch switching datapath\n"); 2022 2023 err = ovs_flow_init(); 2024 if (err) 2025 goto error; 2026 2027 err = ovs_vport_init(); 2028 if (err) 2029 goto error_flow_exit; 2030 2031 err = register_pernet_device(&ovs_net_ops); 2032 if (err) 2033 goto error_vport_exit; 2034 2035 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2036 if (err) 2037 goto error_netns_exit; 2038 2039 err = dp_register_genl(); 2040 if (err < 0) 2041 goto error_unreg_notifier; 2042 2043 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); 2044 2045 return 0; 2046 2047error_unreg_notifier: 2048 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2049error_netns_exit: 2050 unregister_pernet_device(&ovs_net_ops); 2051error_vport_exit: 2052 ovs_vport_exit(); 2053error_flow_exit: 2054 ovs_flow_exit(); 2055error: 2056 return err; 2057} 2058 2059static void dp_cleanup(void) 2060{ 2061 cancel_delayed_work_sync(&rehash_flow_wq); 2062 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2063 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2064 unregister_pernet_device(&ovs_net_ops); 2065 rcu_barrier(); 2066 ovs_vport_exit(); 2067 ovs_flow_exit(); 2068} 2069 2070module_init(dp_init); 2071module_exit(dp_cleanup); 2072 2073MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2074MODULE_LICENSE("GPL"); 2075