1 /* 2 * Copyright (c) 2007-2013 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/lockdep.h> 48 #include <linux/openvswitch.h> 49 #include <linux/rculist.h> 50 #include <linux/dmi.h> 51 #include <linux/workqueue.h> 52 #include <net/genetlink.h> 53 #include <net/net_namespace.h> 54 #include <net/netns/generic.h> 55 56 #include "datapath.h" 57 #include "flow.h" 58 #include "flow_table.h" 59 #include "flow_netlink.h" 60 #include "vport-internal_dev.h" 61 #include "vport-netdev.h" 62 63 int ovs_net_id __read_mostly; 64 65 static void ovs_notify(struct genl_family *family, 66 struct sk_buff *skb, struct genl_info *info) 67 { 68 genl_notify(family, skb, genl_info_net(info), info->snd_portid, 69 0, info->nlhdr, GFP_KERNEL); 70 } 71 72 /** 73 * DOC: Locking: 74 * 75 * All writes e.g. Writes to device state (add/remove datapath, port, set 76 * operations on vports, etc.), Writes to other state (flow table 77 * modifications, set miscellaneous datapath parameters, etc.) are protected 78 * by ovs_lock. 79 * 80 * Reads are protected by RCU. 81 * 82 * There are a few special cases (mostly stats) that have their own 83 * synchronization but they nest under all of above and don't interact with 84 * each other. 85 * 86 * The RTNL lock nests inside ovs_mutex. 87 */ 88 89 static DEFINE_MUTEX(ovs_mutex); 90 91 void ovs_lock(void) 92 { 93 mutex_lock(&ovs_mutex); 94 } 95 96 void ovs_unlock(void) 97 { 98 mutex_unlock(&ovs_mutex); 99 } 100 101 #ifdef CONFIG_LOCKDEP 102 int lockdep_ovsl_is_held(void) 103 { 104 if (debug_locks) 105 return lockdep_is_held(&ovs_mutex); 106 else 107 return 1; 108 } 109 #endif 110 111 static struct vport *new_vport(const struct vport_parms *); 112 static int queue_gso_packets(struct datapath *dp, struct sk_buff *, 113 const struct dp_upcall_info *); 114 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *, 115 const struct dp_upcall_info *); 116 117 /* Must be called with rcu_read_lock or ovs_mutex. */ 118 static struct datapath *get_dp(struct net *net, int dp_ifindex) 119 { 120 struct datapath *dp = NULL; 121 struct net_device *dev; 122 123 rcu_read_lock(); 124 dev = dev_get_by_index_rcu(net, dp_ifindex); 125 if (dev) { 126 struct vport *vport = ovs_internal_dev_get_vport(dev); 127 if (vport) 128 dp = vport->dp; 129 } 130 rcu_read_unlock(); 131 132 return dp; 133 } 134 135 /* Must be called with rcu_read_lock or ovs_mutex. */ 136 static const char *ovs_dp_name(const struct datapath *dp) 137 { 138 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); 139 return vport->ops->get_name(vport); 140 } 141 142 static int get_dpifindex(struct datapath *dp) 143 { 144 struct vport *local; 145 int ifindex; 146 147 rcu_read_lock(); 148 149 local = ovs_vport_rcu(dp, OVSP_LOCAL); 150 if (local) 151 ifindex = netdev_vport_priv(local)->dev->ifindex; 152 else 153 ifindex = 0; 154 155 rcu_read_unlock(); 156 157 return ifindex; 158 } 159 160 static void destroy_dp_rcu(struct rcu_head *rcu) 161 { 162 struct datapath *dp = container_of(rcu, struct datapath, rcu); 163 164 free_percpu(dp->stats_percpu); 165 release_net(ovs_dp_get_net(dp)); 166 kfree(dp->ports); 167 kfree(dp); 168 } 169 170 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 171 u16 port_no) 172 { 173 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 174 } 175 176 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 177 { 178 struct vport *vport; 179 struct hlist_head *head; 180 181 head = vport_hash_bucket(dp, port_no); 182 hlist_for_each_entry_rcu(vport, head, dp_hash_node) { 183 if (vport->port_no == port_no) 184 return vport; 185 } 186 return NULL; 187 } 188 189 /* Called with ovs_mutex. */ 190 static struct vport *new_vport(const struct vport_parms *parms) 191 { 192 struct vport *vport; 193 194 vport = ovs_vport_add(parms); 195 if (!IS_ERR(vport)) { 196 struct datapath *dp = parms->dp; 197 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 198 199 hlist_add_head_rcu(&vport->dp_hash_node, head); 200 } 201 return vport; 202 } 203 204 void ovs_dp_detach_port(struct vport *p) 205 { 206 ASSERT_OVSL(); 207 208 /* First drop references to device. */ 209 hlist_del_rcu(&p->dp_hash_node); 210 211 /* Then destroy it. */ 212 ovs_vport_del(p); 213 } 214 215 /* Must be called with rcu_read_lock. */ 216 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb) 217 { 218 struct datapath *dp = p->dp; 219 struct sw_flow *flow; 220 struct dp_stats_percpu *stats; 221 struct sw_flow_key key; 222 u64 *stats_counter; 223 u32 n_mask_hit; 224 int error; 225 226 stats = this_cpu_ptr(dp->stats_percpu); 227 228 /* Extract flow from 'skb' into 'key'. */ 229 error = ovs_flow_extract(skb, p->port_no, &key); 230 if (unlikely(error)) { 231 kfree_skb(skb); 232 return; 233 } 234 235 /* Look up flow. */ 236 flow = ovs_flow_tbl_lookup_stats(&dp->table, &key, &n_mask_hit); 237 if (unlikely(!flow)) { 238 struct dp_upcall_info upcall; 239 240 upcall.cmd = OVS_PACKET_CMD_MISS; 241 upcall.key = &key; 242 upcall.userdata = NULL; 243 upcall.portid = p->upcall_portid; 244 ovs_dp_upcall(dp, skb, &upcall); 245 consume_skb(skb); 246 stats_counter = &stats->n_missed; 247 goto out; 248 } 249 250 OVS_CB(skb)->flow = flow; 251 OVS_CB(skb)->pkt_key = &key; 252 253 ovs_flow_stats_update(OVS_CB(skb)->flow, skb); 254 ovs_execute_actions(dp, skb); 255 stats_counter = &stats->n_hit; 256 257 out: 258 /* Update datapath statistics. */ 259 u64_stats_update_begin(&stats->syncp); 260 (*stats_counter)++; 261 stats->n_mask_hit += n_mask_hit; 262 u64_stats_update_end(&stats->syncp); 263 } 264 265 static struct genl_family dp_packet_genl_family = { 266 .id = GENL_ID_GENERATE, 267 .hdrsize = sizeof(struct ovs_header), 268 .name = OVS_PACKET_FAMILY, 269 .version = OVS_PACKET_VERSION, 270 .maxattr = OVS_PACKET_ATTR_MAX, 271 .netnsok = true, 272 .parallel_ops = true, 273 }; 274 275 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 276 const struct dp_upcall_info *upcall_info) 277 { 278 struct dp_stats_percpu *stats; 279 int err; 280 281 if (upcall_info->portid == 0) { 282 err = -ENOTCONN; 283 goto err; 284 } 285 286 if (!skb_is_gso(skb)) 287 err = queue_userspace_packet(dp, skb, upcall_info); 288 else 289 err = queue_gso_packets(dp, skb, upcall_info); 290 if (err) 291 goto err; 292 293 return 0; 294 295 err: 296 stats = this_cpu_ptr(dp->stats_percpu); 297 298 u64_stats_update_begin(&stats->syncp); 299 stats->n_lost++; 300 u64_stats_update_end(&stats->syncp); 301 302 return err; 303 } 304 305 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 306 const struct dp_upcall_info *upcall_info) 307 { 308 unsigned short gso_type = skb_shinfo(skb)->gso_type; 309 struct dp_upcall_info later_info; 310 struct sw_flow_key later_key; 311 struct sk_buff *segs, *nskb; 312 int err; 313 314 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 315 if (IS_ERR(segs)) 316 return PTR_ERR(segs); 317 318 /* Queue all of the segments. */ 319 skb = segs; 320 do { 321 err = queue_userspace_packet(dp, skb, upcall_info); 322 if (err) 323 break; 324 325 if (skb == segs && gso_type & SKB_GSO_UDP) { 326 /* The initial flow key extracted by ovs_flow_extract() 327 * in this case is for a first fragment, so we need to 328 * properly mark later fragments. 329 */ 330 later_key = *upcall_info->key; 331 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 332 333 later_info = *upcall_info; 334 later_info.key = &later_key; 335 upcall_info = &later_info; 336 } 337 } while ((skb = skb->next)); 338 339 /* Free all of the segments. */ 340 skb = segs; 341 do { 342 nskb = skb->next; 343 if (err) 344 kfree_skb(skb); 345 else 346 consume_skb(skb); 347 } while ((skb = nskb)); 348 return err; 349 } 350 351 static size_t key_attr_size(void) 352 { 353 return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */ 354 + nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */ 355 + nla_total_size(8) /* OVS_TUNNEL_KEY_ATTR_ID */ 356 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */ 357 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */ 358 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TOS */ 359 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TTL */ 360 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */ 361 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_CSUM */ 362 + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */ 363 + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */ 364 + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */ 365 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */ 366 + nla_total_size(4) /* OVS_KEY_ATTR_8021Q */ 367 + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */ 368 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */ 369 + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */ 370 + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */ 371 + nla_total_size(28); /* OVS_KEY_ATTR_ND */ 372 } 373 374 static size_t upcall_msg_size(const struct nlattr *userdata, 375 unsigned int hdrlen) 376 { 377 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 378 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 379 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */ 380 381 /* OVS_PACKET_ATTR_USERDATA */ 382 if (userdata) 383 size += NLA_ALIGN(userdata->nla_len); 384 385 return size; 386 } 387 388 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 389 const struct dp_upcall_info *upcall_info) 390 { 391 struct ovs_header *upcall; 392 struct sk_buff *nskb = NULL; 393 struct sk_buff *user_skb; /* to be queued to userspace */ 394 struct nlattr *nla; 395 struct genl_info info = { 396 .dst_sk = ovs_dp_get_net(dp)->genl_sock, 397 .snd_portid = upcall_info->portid, 398 }; 399 size_t len; 400 unsigned int hlen; 401 int err, dp_ifindex; 402 403 dp_ifindex = get_dpifindex(dp); 404 if (!dp_ifindex) 405 return -ENODEV; 406 407 if (vlan_tx_tag_present(skb)) { 408 nskb = skb_clone(skb, GFP_ATOMIC); 409 if (!nskb) 410 return -ENOMEM; 411 412 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb)); 413 if (!nskb) 414 return -ENOMEM; 415 416 nskb->vlan_tci = 0; 417 skb = nskb; 418 } 419 420 if (nla_attr_size(skb->len) > USHRT_MAX) { 421 err = -EFBIG; 422 goto out; 423 } 424 425 /* Complete checksum if needed */ 426 if (skb->ip_summed == CHECKSUM_PARTIAL && 427 (err = skb_checksum_help(skb))) 428 goto out; 429 430 /* Older versions of OVS user space enforce alignment of the last 431 * Netlink attribute to NLA_ALIGNTO which would require extensive 432 * padding logic. Only perform zerocopy if padding is not required. 433 */ 434 if (dp->user_features & OVS_DP_F_UNALIGNED) 435 hlen = skb_zerocopy_headlen(skb); 436 else 437 hlen = skb->len; 438 439 len = upcall_msg_size(upcall_info->userdata, hlen); 440 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC); 441 if (!user_skb) { 442 err = -ENOMEM; 443 goto out; 444 } 445 446 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 447 0, upcall_info->cmd); 448 upcall->dp_ifindex = dp_ifindex; 449 450 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY); 451 ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb); 452 nla_nest_end(user_skb, nla); 453 454 if (upcall_info->userdata) 455 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 456 nla_len(upcall_info->userdata), 457 nla_data(upcall_info->userdata)); 458 459 /* Only reserve room for attribute header, packet data is added 460 * in skb_zerocopy() */ 461 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 462 err = -ENOBUFS; 463 goto out; 464 } 465 nla->nla_len = nla_attr_size(skb->len); 466 467 err = skb_zerocopy(user_skb, skb, skb->len, hlen); 468 if (err) 469 goto out; 470 471 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 472 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 473 size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len; 474 475 if (plen > 0) 476 memset(skb_put(user_skb, plen), 0, plen); 477 } 478 479 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 480 481 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 482 out: 483 if (err) 484 skb_tx_error(skb); 485 kfree_skb(nskb); 486 return err; 487 } 488 489 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 490 { 491 struct ovs_header *ovs_header = info->userhdr; 492 struct nlattr **a = info->attrs; 493 struct sw_flow_actions *acts; 494 struct sk_buff *packet; 495 struct sw_flow *flow; 496 struct datapath *dp; 497 struct ethhdr *eth; 498 int len; 499 int err; 500 501 err = -EINVAL; 502 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 503 !a[OVS_PACKET_ATTR_ACTIONS]) 504 goto err; 505 506 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 507 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 508 err = -ENOMEM; 509 if (!packet) 510 goto err; 511 skb_reserve(packet, NET_IP_ALIGN); 512 513 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 514 515 skb_reset_mac_header(packet); 516 eth = eth_hdr(packet); 517 518 /* Normally, setting the skb 'protocol' field would be handled by a 519 * call to eth_type_trans(), but it assumes there's a sending 520 * device, which we may not have. */ 521 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) 522 packet->protocol = eth->h_proto; 523 else 524 packet->protocol = htons(ETH_P_802_2); 525 526 /* Build an sw_flow for sending this packet. */ 527 flow = ovs_flow_alloc(false); 528 err = PTR_ERR(flow); 529 if (IS_ERR(flow)) 530 goto err_kfree_skb; 531 532 err = ovs_flow_extract(packet, -1, &flow->key); 533 if (err) 534 goto err_flow_free; 535 536 err = ovs_nla_get_flow_metadata(flow, a[OVS_PACKET_ATTR_KEY]); 537 if (err) 538 goto err_flow_free; 539 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS])); 540 err = PTR_ERR(acts); 541 if (IS_ERR(acts)) 542 goto err_flow_free; 543 544 err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS], 545 &flow->key, 0, &acts); 546 rcu_assign_pointer(flow->sf_acts, acts); 547 if (err) 548 goto err_flow_free; 549 550 OVS_CB(packet)->flow = flow; 551 OVS_CB(packet)->pkt_key = &flow->key; 552 packet->priority = flow->key.phy.priority; 553 packet->mark = flow->key.phy.skb_mark; 554 555 rcu_read_lock(); 556 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 557 err = -ENODEV; 558 if (!dp) 559 goto err_unlock; 560 561 local_bh_disable(); 562 err = ovs_execute_actions(dp, packet); 563 local_bh_enable(); 564 rcu_read_unlock(); 565 566 ovs_flow_free(flow, false); 567 return err; 568 569 err_unlock: 570 rcu_read_unlock(); 571 err_flow_free: 572 ovs_flow_free(flow, false); 573 err_kfree_skb: 574 kfree_skb(packet); 575 err: 576 return err; 577 } 578 579 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 580 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 581 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 582 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 583 }; 584 585 static const struct genl_ops dp_packet_genl_ops[] = { 586 { .cmd = OVS_PACKET_CMD_EXECUTE, 587 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 588 .policy = packet_policy, 589 .doit = ovs_packet_cmd_execute 590 } 591 }; 592 593 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats, 594 struct ovs_dp_megaflow_stats *mega_stats) 595 { 596 int i; 597 598 memset(mega_stats, 0, sizeof(*mega_stats)); 599 600 stats->n_flows = ovs_flow_tbl_count(&dp->table); 601 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 602 603 stats->n_hit = stats->n_missed = stats->n_lost = 0; 604 605 for_each_possible_cpu(i) { 606 const struct dp_stats_percpu *percpu_stats; 607 struct dp_stats_percpu local_stats; 608 unsigned int start; 609 610 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 611 612 do { 613 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 614 local_stats = *percpu_stats; 615 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 616 617 stats->n_hit += local_stats.n_hit; 618 stats->n_missed += local_stats.n_missed; 619 stats->n_lost += local_stats.n_lost; 620 mega_stats->n_mask_hit += local_stats.n_mask_hit; 621 } 622 } 623 624 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 625 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 626 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 627 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 628 }; 629 630 static struct genl_family dp_flow_genl_family = { 631 .id = GENL_ID_GENERATE, 632 .hdrsize = sizeof(struct ovs_header), 633 .name = OVS_FLOW_FAMILY, 634 .version = OVS_FLOW_VERSION, 635 .maxattr = OVS_FLOW_ATTR_MAX, 636 .netnsok = true, 637 .parallel_ops = true, 638 }; 639 640 static struct genl_multicast_group ovs_dp_flow_multicast_group = { 641 .name = OVS_FLOW_MCGROUP 642 }; 643 644 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts) 645 { 646 return NLMSG_ALIGN(sizeof(struct ovs_header)) 647 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */ 648 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */ 649 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 650 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 651 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */ 652 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */ 653 } 654 655 /* Called with ovs_mutex. */ 656 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp, 657 struct sk_buff *skb, u32 portid, 658 u32 seq, u32 flags, u8 cmd) 659 { 660 const int skb_orig_len = skb->len; 661 struct nlattr *start; 662 struct ovs_flow_stats stats; 663 __be16 tcp_flags; 664 unsigned long used; 665 struct ovs_header *ovs_header; 666 struct nlattr *nla; 667 int err; 668 669 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd); 670 if (!ovs_header) 671 return -EMSGSIZE; 672 673 ovs_header->dp_ifindex = get_dpifindex(dp); 674 675 /* Fill flow key. */ 676 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY); 677 if (!nla) 678 goto nla_put_failure; 679 680 err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb); 681 if (err) 682 goto error; 683 nla_nest_end(skb, nla); 684 685 nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK); 686 if (!nla) 687 goto nla_put_failure; 688 689 err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb); 690 if (err) 691 goto error; 692 693 nla_nest_end(skb, nla); 694 695 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 696 if (used && 697 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used))) 698 goto nla_put_failure; 699 700 if (stats.n_packets && 701 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats)) 702 goto nla_put_failure; 703 704 if ((u8)ntohs(tcp_flags) && 705 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 706 goto nla_put_failure; 707 708 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 709 * this is the first flow to be dumped into 'skb'. This is unusual for 710 * Netlink but individual action lists can be longer than 711 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 712 * The userspace caller can always fetch the actions separately if it 713 * really wants them. (Most userspace callers in fact don't care.) 714 * 715 * This can only fail for dump operations because the skb is always 716 * properly sized for single flows. 717 */ 718 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS); 719 if (start) { 720 const struct sw_flow_actions *sf_acts; 721 722 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 723 724 err = ovs_nla_put_actions(sf_acts->actions, 725 sf_acts->actions_len, skb); 726 if (!err) 727 nla_nest_end(skb, start); 728 else { 729 if (skb_orig_len) 730 goto error; 731 732 nla_nest_cancel(skb, start); 733 } 734 } else if (skb_orig_len) 735 goto nla_put_failure; 736 737 return genlmsg_end(skb, ovs_header); 738 739 nla_put_failure: 740 err = -EMSGSIZE; 741 error: 742 genlmsg_cancel(skb, ovs_header); 743 return err; 744 } 745 746 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow, 747 struct genl_info *info) 748 { 749 size_t len; 750 751 len = ovs_flow_cmd_msg_size(ovsl_dereference(flow->sf_acts)); 752 753 return genlmsg_new_unicast(len, info, GFP_KERNEL); 754 } 755 756 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow, 757 struct datapath *dp, 758 struct genl_info *info, 759 u8 cmd) 760 { 761 struct sk_buff *skb; 762 int retval; 763 764 skb = ovs_flow_cmd_alloc_info(flow, info); 765 if (!skb) 766 return ERR_PTR(-ENOMEM); 767 768 retval = ovs_flow_cmd_fill_info(flow, dp, skb, info->snd_portid, 769 info->snd_seq, 0, cmd); 770 BUG_ON(retval < 0); 771 return skb; 772 } 773 774 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info) 775 { 776 struct nlattr **a = info->attrs; 777 struct ovs_header *ovs_header = info->userhdr; 778 struct sw_flow_key key, masked_key; 779 struct sw_flow *flow = NULL; 780 struct sw_flow_mask mask; 781 struct sk_buff *reply; 782 struct datapath *dp; 783 struct sw_flow_actions *acts = NULL; 784 struct sw_flow_match match; 785 bool exact_5tuple; 786 int error; 787 788 /* Extract key. */ 789 error = -EINVAL; 790 if (!a[OVS_FLOW_ATTR_KEY]) 791 goto error; 792 793 ovs_match_init(&match, &key, &mask); 794 error = ovs_nla_get_match(&match, &exact_5tuple, 795 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]); 796 if (error) 797 goto error; 798 799 /* Validate actions. */ 800 if (a[OVS_FLOW_ATTR_ACTIONS]) { 801 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS])); 802 error = PTR_ERR(acts); 803 if (IS_ERR(acts)) 804 goto error; 805 806 ovs_flow_mask_key(&masked_key, &key, &mask); 807 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], 808 &masked_key, 0, &acts); 809 if (error) { 810 OVS_NLERR("Flow actions may not be safe on all matching packets.\n"); 811 goto err_kfree; 812 } 813 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) { 814 error = -EINVAL; 815 goto error; 816 } 817 818 ovs_lock(); 819 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 820 error = -ENODEV; 821 if (!dp) 822 goto err_unlock_ovs; 823 824 /* Check if this is a duplicate flow */ 825 flow = ovs_flow_tbl_lookup(&dp->table, &key); 826 if (!flow) { 827 /* Bail out if we're not allowed to create a new flow. */ 828 error = -ENOENT; 829 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET) 830 goto err_unlock_ovs; 831 832 /* Allocate flow. */ 833 flow = ovs_flow_alloc(!exact_5tuple); 834 if (IS_ERR(flow)) { 835 error = PTR_ERR(flow); 836 goto err_unlock_ovs; 837 } 838 839 flow->key = masked_key; 840 flow->unmasked_key = key; 841 rcu_assign_pointer(flow->sf_acts, acts); 842 843 /* Put flow in bucket. */ 844 error = ovs_flow_tbl_insert(&dp->table, flow, &mask); 845 if (error) { 846 acts = NULL; 847 goto err_flow_free; 848 } 849 850 reply = ovs_flow_cmd_build_info(flow, dp, info, OVS_FLOW_CMD_NEW); 851 } else { 852 /* We found a matching flow. */ 853 struct sw_flow_actions *old_acts; 854 855 /* Bail out if we're not allowed to modify an existing flow. 856 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 857 * because Generic Netlink treats the latter as a dump 858 * request. We also accept NLM_F_EXCL in case that bug ever 859 * gets fixed. 860 */ 861 error = -EEXIST; 862 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW && 863 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL)) 864 goto err_unlock_ovs; 865 866 /* The unmasked key has to be the same for flow updates. */ 867 if (!ovs_flow_cmp_unmasked_key(flow, &match)) 868 goto err_unlock_ovs; 869 870 /* Update actions. */ 871 old_acts = ovsl_dereference(flow->sf_acts); 872 rcu_assign_pointer(flow->sf_acts, acts); 873 ovs_nla_free_flow_actions(old_acts); 874 875 reply = ovs_flow_cmd_build_info(flow, dp, info, OVS_FLOW_CMD_NEW); 876 877 /* Clear stats. */ 878 if (a[OVS_FLOW_ATTR_CLEAR]) 879 ovs_flow_stats_clear(flow); 880 } 881 ovs_unlock(); 882 883 if (!IS_ERR(reply)) 884 ovs_notify(&dp_flow_genl_family, reply, info); 885 else 886 genl_set_err(&dp_flow_genl_family, sock_net(skb->sk), 0, 887 0, PTR_ERR(reply)); 888 return 0; 889 890 err_flow_free: 891 ovs_flow_free(flow, false); 892 err_unlock_ovs: 893 ovs_unlock(); 894 err_kfree: 895 kfree(acts); 896 error: 897 return error; 898 } 899 900 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 901 { 902 struct nlattr **a = info->attrs; 903 struct ovs_header *ovs_header = info->userhdr; 904 struct sw_flow_key key; 905 struct sk_buff *reply; 906 struct sw_flow *flow; 907 struct datapath *dp; 908 struct sw_flow_match match; 909 int err; 910 911 if (!a[OVS_FLOW_ATTR_KEY]) { 912 OVS_NLERR("Flow get message rejected, Key attribute missing.\n"); 913 return -EINVAL; 914 } 915 916 ovs_match_init(&match, &key, NULL); 917 err = ovs_nla_get_match(&match, NULL, a[OVS_FLOW_ATTR_KEY], NULL); 918 if (err) 919 return err; 920 921 ovs_lock(); 922 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 923 if (!dp) { 924 err = -ENODEV; 925 goto unlock; 926 } 927 928 flow = ovs_flow_tbl_lookup(&dp->table, &key); 929 if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) { 930 err = -ENOENT; 931 goto unlock; 932 } 933 934 reply = ovs_flow_cmd_build_info(flow, dp, info, OVS_FLOW_CMD_NEW); 935 if (IS_ERR(reply)) { 936 err = PTR_ERR(reply); 937 goto unlock; 938 } 939 940 ovs_unlock(); 941 return genlmsg_reply(reply, info); 942 unlock: 943 ovs_unlock(); 944 return err; 945 } 946 947 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 948 { 949 struct nlattr **a = info->attrs; 950 struct ovs_header *ovs_header = info->userhdr; 951 struct sw_flow_key key; 952 struct sk_buff *reply; 953 struct sw_flow *flow; 954 struct datapath *dp; 955 struct sw_flow_match match; 956 int err; 957 958 ovs_lock(); 959 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 960 if (!dp) { 961 err = -ENODEV; 962 goto unlock; 963 } 964 965 if (!a[OVS_FLOW_ATTR_KEY]) { 966 err = ovs_flow_tbl_flush(&dp->table); 967 goto unlock; 968 } 969 970 ovs_match_init(&match, &key, NULL); 971 err = ovs_nla_get_match(&match, NULL, a[OVS_FLOW_ATTR_KEY], NULL); 972 if (err) 973 goto unlock; 974 975 flow = ovs_flow_tbl_lookup(&dp->table, &key); 976 if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) { 977 err = -ENOENT; 978 goto unlock; 979 } 980 981 reply = ovs_flow_cmd_alloc_info(flow, info); 982 if (!reply) { 983 err = -ENOMEM; 984 goto unlock; 985 } 986 987 ovs_flow_tbl_remove(&dp->table, flow); 988 989 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid, 990 info->snd_seq, 0, OVS_FLOW_CMD_DEL); 991 BUG_ON(err < 0); 992 993 ovs_flow_free(flow, true); 994 ovs_unlock(); 995 996 ovs_notify(&dp_flow_genl_family, reply, info); 997 return 0; 998 unlock: 999 ovs_unlock(); 1000 return err; 1001 } 1002 1003 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1004 { 1005 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1006 struct table_instance *ti; 1007 struct datapath *dp; 1008 1009 rcu_read_lock(); 1010 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1011 if (!dp) { 1012 rcu_read_unlock(); 1013 return -ENODEV; 1014 } 1015 1016 ti = rcu_dereference(dp->table.ti); 1017 for (;;) { 1018 struct sw_flow *flow; 1019 u32 bucket, obj; 1020 1021 bucket = cb->args[0]; 1022 obj = cb->args[1]; 1023 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1024 if (!flow) 1025 break; 1026 1027 if (ovs_flow_cmd_fill_info(flow, dp, skb, 1028 NETLINK_CB(cb->skb).portid, 1029 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1030 OVS_FLOW_CMD_NEW) < 0) 1031 break; 1032 1033 cb->args[0] = bucket; 1034 cb->args[1] = obj; 1035 } 1036 rcu_read_unlock(); 1037 return skb->len; 1038 } 1039 1040 static const struct genl_ops dp_flow_genl_ops[] = { 1041 { .cmd = OVS_FLOW_CMD_NEW, 1042 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1043 .policy = flow_policy, 1044 .doit = ovs_flow_cmd_new_or_set 1045 }, 1046 { .cmd = OVS_FLOW_CMD_DEL, 1047 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1048 .policy = flow_policy, 1049 .doit = ovs_flow_cmd_del 1050 }, 1051 { .cmd = OVS_FLOW_CMD_GET, 1052 .flags = 0, /* OK for unprivileged users. */ 1053 .policy = flow_policy, 1054 .doit = ovs_flow_cmd_get, 1055 .dumpit = ovs_flow_cmd_dump 1056 }, 1057 { .cmd = OVS_FLOW_CMD_SET, 1058 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1059 .policy = flow_policy, 1060 .doit = ovs_flow_cmd_new_or_set, 1061 }, 1062 }; 1063 1064 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1065 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1066 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1067 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1068 }; 1069 1070 static struct genl_family dp_datapath_genl_family = { 1071 .id = GENL_ID_GENERATE, 1072 .hdrsize = sizeof(struct ovs_header), 1073 .name = OVS_DATAPATH_FAMILY, 1074 .version = OVS_DATAPATH_VERSION, 1075 .maxattr = OVS_DP_ATTR_MAX, 1076 .netnsok = true, 1077 .parallel_ops = true, 1078 }; 1079 1080 static struct genl_multicast_group ovs_dp_datapath_multicast_group = { 1081 .name = OVS_DATAPATH_MCGROUP 1082 }; 1083 1084 static size_t ovs_dp_cmd_msg_size(void) 1085 { 1086 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1087 1088 msgsize += nla_total_size(IFNAMSIZ); 1089 msgsize += nla_total_size(sizeof(struct ovs_dp_stats)); 1090 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats)); 1091 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1092 1093 return msgsize; 1094 } 1095 1096 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1097 u32 portid, u32 seq, u32 flags, u8 cmd) 1098 { 1099 struct ovs_header *ovs_header; 1100 struct ovs_dp_stats dp_stats; 1101 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1102 int err; 1103 1104 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1105 flags, cmd); 1106 if (!ovs_header) 1107 goto error; 1108 1109 ovs_header->dp_ifindex = get_dpifindex(dp); 1110 1111 rcu_read_lock(); 1112 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1113 rcu_read_unlock(); 1114 if (err) 1115 goto nla_put_failure; 1116 1117 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1118 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1119 &dp_stats)) 1120 goto nla_put_failure; 1121 1122 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1123 sizeof(struct ovs_dp_megaflow_stats), 1124 &dp_megaflow_stats)) 1125 goto nla_put_failure; 1126 1127 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1128 goto nla_put_failure; 1129 1130 return genlmsg_end(skb, ovs_header); 1131 1132 nla_put_failure: 1133 genlmsg_cancel(skb, ovs_header); 1134 error: 1135 return -EMSGSIZE; 1136 } 1137 1138 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, 1139 struct genl_info *info, u8 cmd) 1140 { 1141 struct sk_buff *skb; 1142 int retval; 1143 1144 skb = genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL); 1145 if (!skb) 1146 return ERR_PTR(-ENOMEM); 1147 1148 retval = ovs_dp_cmd_fill_info(dp, skb, info->snd_portid, info->snd_seq, 0, cmd); 1149 if (retval < 0) { 1150 kfree_skb(skb); 1151 return ERR_PTR(retval); 1152 } 1153 return skb; 1154 } 1155 1156 /* Called with ovs_mutex. */ 1157 static struct datapath *lookup_datapath(struct net *net, 1158 struct ovs_header *ovs_header, 1159 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1160 { 1161 struct datapath *dp; 1162 1163 if (!a[OVS_DP_ATTR_NAME]) 1164 dp = get_dp(net, ovs_header->dp_ifindex); 1165 else { 1166 struct vport *vport; 1167 1168 rcu_read_lock(); 1169 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1170 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1171 rcu_read_unlock(); 1172 } 1173 return dp ? dp : ERR_PTR(-ENODEV); 1174 } 1175 1176 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info) 1177 { 1178 struct datapath *dp; 1179 1180 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1181 if (IS_ERR(dp)) 1182 return; 1183 1184 WARN(dp->user_features, "Dropping previously announced user features\n"); 1185 dp->user_features = 0; 1186 } 1187 1188 static void ovs_dp_change(struct datapath *dp, struct nlattr **a) 1189 { 1190 if (a[OVS_DP_ATTR_USER_FEATURES]) 1191 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1192 } 1193 1194 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1195 { 1196 struct nlattr **a = info->attrs; 1197 struct vport_parms parms; 1198 struct sk_buff *reply; 1199 struct datapath *dp; 1200 struct vport *vport; 1201 struct ovs_net *ovs_net; 1202 int err, i; 1203 1204 err = -EINVAL; 1205 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1206 goto err; 1207 1208 ovs_lock(); 1209 1210 err = -ENOMEM; 1211 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1212 if (dp == NULL) 1213 goto err_unlock_ovs; 1214 1215 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk))); 1216 1217 /* Allocate table. */ 1218 err = ovs_flow_tbl_init(&dp->table); 1219 if (err) 1220 goto err_free_dp; 1221 1222 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1223 if (!dp->stats_percpu) { 1224 err = -ENOMEM; 1225 goto err_destroy_table; 1226 } 1227 1228 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head), 1229 GFP_KERNEL); 1230 if (!dp->ports) { 1231 err = -ENOMEM; 1232 goto err_destroy_percpu; 1233 } 1234 1235 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1236 INIT_HLIST_HEAD(&dp->ports[i]); 1237 1238 /* Set up our datapath device. */ 1239 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1240 parms.type = OVS_VPORT_TYPE_INTERNAL; 1241 parms.options = NULL; 1242 parms.dp = dp; 1243 parms.port_no = OVSP_LOCAL; 1244 parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]); 1245 1246 ovs_dp_change(dp, a); 1247 1248 vport = new_vport(&parms); 1249 if (IS_ERR(vport)) { 1250 err = PTR_ERR(vport); 1251 if (err == -EBUSY) 1252 err = -EEXIST; 1253 1254 if (err == -EEXIST) { 1255 /* An outdated user space instance that does not understand 1256 * the concept of user_features has attempted to create a new 1257 * datapath and is likely to reuse it. Drop all user features. 1258 */ 1259 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1260 ovs_dp_reset_user_features(skb, info); 1261 } 1262 1263 goto err_destroy_ports_array; 1264 } 1265 1266 reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW); 1267 err = PTR_ERR(reply); 1268 if (IS_ERR(reply)) 1269 goto err_destroy_local_port; 1270 1271 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1272 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1273 1274 ovs_unlock(); 1275 1276 ovs_notify(&dp_datapath_genl_family, reply, info); 1277 return 0; 1278 1279 err_destroy_local_port: 1280 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1281 err_destroy_ports_array: 1282 kfree(dp->ports); 1283 err_destroy_percpu: 1284 free_percpu(dp->stats_percpu); 1285 err_destroy_table: 1286 ovs_flow_tbl_destroy(&dp->table, false); 1287 err_free_dp: 1288 release_net(ovs_dp_get_net(dp)); 1289 kfree(dp); 1290 err_unlock_ovs: 1291 ovs_unlock(); 1292 err: 1293 return err; 1294 } 1295 1296 /* Called with ovs_mutex. */ 1297 static void __dp_destroy(struct datapath *dp) 1298 { 1299 int i; 1300 1301 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1302 struct vport *vport; 1303 struct hlist_node *n; 1304 1305 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1306 if (vport->port_no != OVSP_LOCAL) 1307 ovs_dp_detach_port(vport); 1308 } 1309 1310 list_del_rcu(&dp->list_node); 1311 1312 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1313 * all ports in datapath are destroyed first before freeing datapath. 1314 */ 1315 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1316 1317 /* RCU destroy the flow table */ 1318 ovs_flow_tbl_destroy(&dp->table, true); 1319 1320 call_rcu(&dp->rcu, destroy_dp_rcu); 1321 } 1322 1323 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1324 { 1325 struct sk_buff *reply; 1326 struct datapath *dp; 1327 int err; 1328 1329 ovs_lock(); 1330 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1331 err = PTR_ERR(dp); 1332 if (IS_ERR(dp)) 1333 goto unlock; 1334 1335 reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_DEL); 1336 err = PTR_ERR(reply); 1337 if (IS_ERR(reply)) 1338 goto unlock; 1339 1340 __dp_destroy(dp); 1341 ovs_unlock(); 1342 1343 ovs_notify(&dp_datapath_genl_family, reply, info); 1344 1345 return 0; 1346 unlock: 1347 ovs_unlock(); 1348 return err; 1349 } 1350 1351 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1352 { 1353 struct sk_buff *reply; 1354 struct datapath *dp; 1355 int err; 1356 1357 ovs_lock(); 1358 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1359 err = PTR_ERR(dp); 1360 if (IS_ERR(dp)) 1361 goto unlock; 1362 1363 ovs_dp_change(dp, info->attrs); 1364 1365 reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW); 1366 if (IS_ERR(reply)) { 1367 err = PTR_ERR(reply); 1368 genl_set_err(&dp_datapath_genl_family, sock_net(skb->sk), 0, 1369 0, err); 1370 err = 0; 1371 goto unlock; 1372 } 1373 1374 ovs_unlock(); 1375 ovs_notify(&dp_datapath_genl_family, reply, info); 1376 1377 return 0; 1378 unlock: 1379 ovs_unlock(); 1380 return err; 1381 } 1382 1383 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1384 { 1385 struct sk_buff *reply; 1386 struct datapath *dp; 1387 int err; 1388 1389 ovs_lock(); 1390 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1391 if (IS_ERR(dp)) { 1392 err = PTR_ERR(dp); 1393 goto unlock; 1394 } 1395 1396 reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW); 1397 if (IS_ERR(reply)) { 1398 err = PTR_ERR(reply); 1399 goto unlock; 1400 } 1401 1402 ovs_unlock(); 1403 return genlmsg_reply(reply, info); 1404 1405 unlock: 1406 ovs_unlock(); 1407 return err; 1408 } 1409 1410 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1411 { 1412 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1413 struct datapath *dp; 1414 int skip = cb->args[0]; 1415 int i = 0; 1416 1417 rcu_read_lock(); 1418 list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) { 1419 if (i >= skip && 1420 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1421 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1422 OVS_DP_CMD_NEW) < 0) 1423 break; 1424 i++; 1425 } 1426 rcu_read_unlock(); 1427 1428 cb->args[0] = i; 1429 1430 return skb->len; 1431 } 1432 1433 static const struct genl_ops dp_datapath_genl_ops[] = { 1434 { .cmd = OVS_DP_CMD_NEW, 1435 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1436 .policy = datapath_policy, 1437 .doit = ovs_dp_cmd_new 1438 }, 1439 { .cmd = OVS_DP_CMD_DEL, 1440 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1441 .policy = datapath_policy, 1442 .doit = ovs_dp_cmd_del 1443 }, 1444 { .cmd = OVS_DP_CMD_GET, 1445 .flags = 0, /* OK for unprivileged users. */ 1446 .policy = datapath_policy, 1447 .doit = ovs_dp_cmd_get, 1448 .dumpit = ovs_dp_cmd_dump 1449 }, 1450 { .cmd = OVS_DP_CMD_SET, 1451 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1452 .policy = datapath_policy, 1453 .doit = ovs_dp_cmd_set, 1454 }, 1455 }; 1456 1457 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 1458 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1459 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 1460 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 1461 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 1462 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1463 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 1464 }; 1465 1466 struct genl_family dp_vport_genl_family = { 1467 .id = GENL_ID_GENERATE, 1468 .hdrsize = sizeof(struct ovs_header), 1469 .name = OVS_VPORT_FAMILY, 1470 .version = OVS_VPORT_VERSION, 1471 .maxattr = OVS_VPORT_ATTR_MAX, 1472 .netnsok = true, 1473 .parallel_ops = true, 1474 }; 1475 1476 static struct genl_multicast_group ovs_dp_vport_multicast_group = { 1477 .name = OVS_VPORT_MCGROUP 1478 }; 1479 1480 /* Called with ovs_mutex or RCU read lock. */ 1481 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1482 u32 portid, u32 seq, u32 flags, u8 cmd) 1483 { 1484 struct ovs_header *ovs_header; 1485 struct ovs_vport_stats vport_stats; 1486 int err; 1487 1488 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1489 flags, cmd); 1490 if (!ovs_header) 1491 return -EMSGSIZE; 1492 1493 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1494 1495 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1496 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1497 nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) || 1498 nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid)) 1499 goto nla_put_failure; 1500 1501 ovs_vport_get_stats(vport, &vport_stats); 1502 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), 1503 &vport_stats)) 1504 goto nla_put_failure; 1505 1506 err = ovs_vport_get_options(vport, skb); 1507 if (err == -EMSGSIZE) 1508 goto error; 1509 1510 return genlmsg_end(skb, ovs_header); 1511 1512 nla_put_failure: 1513 err = -EMSGSIZE; 1514 error: 1515 genlmsg_cancel(skb, ovs_header); 1516 return err; 1517 } 1518 1519 /* Called with ovs_mutex or RCU read lock. */ 1520 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid, 1521 u32 seq, u8 cmd) 1522 { 1523 struct sk_buff *skb; 1524 int retval; 1525 1526 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1527 if (!skb) 1528 return ERR_PTR(-ENOMEM); 1529 1530 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd); 1531 BUG_ON(retval < 0); 1532 1533 return skb; 1534 } 1535 1536 /* Called with ovs_mutex or RCU read lock. */ 1537 static struct vport *lookup_vport(struct net *net, 1538 struct ovs_header *ovs_header, 1539 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1540 { 1541 struct datapath *dp; 1542 struct vport *vport; 1543 1544 if (a[OVS_VPORT_ATTR_NAME]) { 1545 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 1546 if (!vport) 1547 return ERR_PTR(-ENODEV); 1548 if (ovs_header->dp_ifindex && 1549 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 1550 return ERR_PTR(-ENODEV); 1551 return vport; 1552 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 1553 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1554 1555 if (port_no >= DP_MAX_PORTS) 1556 return ERR_PTR(-EFBIG); 1557 1558 dp = get_dp(net, ovs_header->dp_ifindex); 1559 if (!dp) 1560 return ERR_PTR(-ENODEV); 1561 1562 vport = ovs_vport_ovsl_rcu(dp, port_no); 1563 if (!vport) 1564 return ERR_PTR(-ENODEV); 1565 return vport; 1566 } else 1567 return ERR_PTR(-EINVAL); 1568 } 1569 1570 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 1571 { 1572 struct nlattr **a = info->attrs; 1573 struct ovs_header *ovs_header = info->userhdr; 1574 struct vport_parms parms; 1575 struct sk_buff *reply; 1576 struct vport *vport; 1577 struct datapath *dp; 1578 u32 port_no; 1579 int err; 1580 1581 err = -EINVAL; 1582 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 1583 !a[OVS_VPORT_ATTR_UPCALL_PID]) 1584 goto exit; 1585 1586 ovs_lock(); 1587 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1588 err = -ENODEV; 1589 if (!dp) 1590 goto exit_unlock; 1591 1592 if (a[OVS_VPORT_ATTR_PORT_NO]) { 1593 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1594 1595 err = -EFBIG; 1596 if (port_no >= DP_MAX_PORTS) 1597 goto exit_unlock; 1598 1599 vport = ovs_vport_ovsl(dp, port_no); 1600 err = -EBUSY; 1601 if (vport) 1602 goto exit_unlock; 1603 } else { 1604 for (port_no = 1; ; port_no++) { 1605 if (port_no >= DP_MAX_PORTS) { 1606 err = -EFBIG; 1607 goto exit_unlock; 1608 } 1609 vport = ovs_vport_ovsl(dp, port_no); 1610 if (!vport) 1611 break; 1612 } 1613 } 1614 1615 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 1616 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 1617 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 1618 parms.dp = dp; 1619 parms.port_no = port_no; 1620 parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); 1621 1622 vport = new_vport(&parms); 1623 err = PTR_ERR(vport); 1624 if (IS_ERR(vport)) 1625 goto exit_unlock; 1626 1627 err = 0; 1628 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, 1629 OVS_VPORT_CMD_NEW); 1630 if (IS_ERR(reply)) { 1631 err = PTR_ERR(reply); 1632 ovs_dp_detach_port(vport); 1633 goto exit_unlock; 1634 } 1635 1636 ovs_notify(&dp_vport_genl_family, reply, info); 1637 1638 exit_unlock: 1639 ovs_unlock(); 1640 exit: 1641 return err; 1642 } 1643 1644 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 1645 { 1646 struct nlattr **a = info->attrs; 1647 struct sk_buff *reply; 1648 struct vport *vport; 1649 int err; 1650 1651 ovs_lock(); 1652 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1653 err = PTR_ERR(vport); 1654 if (IS_ERR(vport)) 1655 goto exit_unlock; 1656 1657 if (a[OVS_VPORT_ATTR_TYPE] && 1658 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 1659 err = -EINVAL; 1660 goto exit_unlock; 1661 } 1662 1663 reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1664 if (!reply) { 1665 err = -ENOMEM; 1666 goto exit_unlock; 1667 } 1668 1669 if (a[OVS_VPORT_ATTR_OPTIONS]) { 1670 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 1671 if (err) 1672 goto exit_free; 1673 } 1674 1675 if (a[OVS_VPORT_ATTR_UPCALL_PID]) 1676 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); 1677 1678 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 1679 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 1680 BUG_ON(err < 0); 1681 1682 ovs_unlock(); 1683 ovs_notify(&dp_vport_genl_family, reply, info); 1684 return 0; 1685 1686 exit_free: 1687 kfree_skb(reply); 1688 exit_unlock: 1689 ovs_unlock(); 1690 return err; 1691 } 1692 1693 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 1694 { 1695 struct nlattr **a = info->attrs; 1696 struct sk_buff *reply; 1697 struct vport *vport; 1698 int err; 1699 1700 ovs_lock(); 1701 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1702 err = PTR_ERR(vport); 1703 if (IS_ERR(vport)) 1704 goto exit_unlock; 1705 1706 if (vport->port_no == OVSP_LOCAL) { 1707 err = -EINVAL; 1708 goto exit_unlock; 1709 } 1710 1711 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, 1712 info->snd_seq, OVS_VPORT_CMD_DEL); 1713 err = PTR_ERR(reply); 1714 if (IS_ERR(reply)) 1715 goto exit_unlock; 1716 1717 err = 0; 1718 ovs_dp_detach_port(vport); 1719 1720 ovs_notify(&dp_vport_genl_family, reply, info); 1721 1722 exit_unlock: 1723 ovs_unlock(); 1724 return err; 1725 } 1726 1727 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 1728 { 1729 struct nlattr **a = info->attrs; 1730 struct ovs_header *ovs_header = info->userhdr; 1731 struct sk_buff *reply; 1732 struct vport *vport; 1733 int err; 1734 1735 rcu_read_lock(); 1736 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 1737 err = PTR_ERR(vport); 1738 if (IS_ERR(vport)) 1739 goto exit_unlock; 1740 1741 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, 1742 info->snd_seq, OVS_VPORT_CMD_NEW); 1743 err = PTR_ERR(reply); 1744 if (IS_ERR(reply)) 1745 goto exit_unlock; 1746 1747 rcu_read_unlock(); 1748 1749 return genlmsg_reply(reply, info); 1750 1751 exit_unlock: 1752 rcu_read_unlock(); 1753 return err; 1754 } 1755 1756 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1757 { 1758 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1759 struct datapath *dp; 1760 int bucket = cb->args[0], skip = cb->args[1]; 1761 int i, j = 0; 1762 1763 rcu_read_lock(); 1764 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1765 if (!dp) { 1766 rcu_read_unlock(); 1767 return -ENODEV; 1768 } 1769 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 1770 struct vport *vport; 1771 1772 j = 0; 1773 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 1774 if (j >= skip && 1775 ovs_vport_cmd_fill_info(vport, skb, 1776 NETLINK_CB(cb->skb).portid, 1777 cb->nlh->nlmsg_seq, 1778 NLM_F_MULTI, 1779 OVS_VPORT_CMD_NEW) < 0) 1780 goto out; 1781 1782 j++; 1783 } 1784 skip = 0; 1785 } 1786 out: 1787 rcu_read_unlock(); 1788 1789 cb->args[0] = i; 1790 cb->args[1] = j; 1791 1792 return skb->len; 1793 } 1794 1795 static const struct genl_ops dp_vport_genl_ops[] = { 1796 { .cmd = OVS_VPORT_CMD_NEW, 1797 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1798 .policy = vport_policy, 1799 .doit = ovs_vport_cmd_new 1800 }, 1801 { .cmd = OVS_VPORT_CMD_DEL, 1802 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1803 .policy = vport_policy, 1804 .doit = ovs_vport_cmd_del 1805 }, 1806 { .cmd = OVS_VPORT_CMD_GET, 1807 .flags = 0, /* OK for unprivileged users. */ 1808 .policy = vport_policy, 1809 .doit = ovs_vport_cmd_get, 1810 .dumpit = ovs_vport_cmd_dump 1811 }, 1812 { .cmd = OVS_VPORT_CMD_SET, 1813 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1814 .policy = vport_policy, 1815 .doit = ovs_vport_cmd_set, 1816 }, 1817 }; 1818 1819 struct genl_family_and_ops { 1820 struct genl_family *family; 1821 const struct genl_ops *ops; 1822 int n_ops; 1823 const struct genl_multicast_group *group; 1824 }; 1825 1826 static const struct genl_family_and_ops dp_genl_families[] = { 1827 { &dp_datapath_genl_family, 1828 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops), 1829 &ovs_dp_datapath_multicast_group }, 1830 { &dp_vport_genl_family, 1831 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops), 1832 &ovs_dp_vport_multicast_group }, 1833 { &dp_flow_genl_family, 1834 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops), 1835 &ovs_dp_flow_multicast_group }, 1836 { &dp_packet_genl_family, 1837 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops), 1838 NULL }, 1839 }; 1840 1841 static void dp_unregister_genl(int n_families) 1842 { 1843 int i; 1844 1845 for (i = 0; i < n_families; i++) 1846 genl_unregister_family(dp_genl_families[i].family); 1847 } 1848 1849 static int dp_register_genl(void) 1850 { 1851 int n_registered; 1852 int err; 1853 int i; 1854 1855 n_registered = 0; 1856 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 1857 const struct genl_family_and_ops *f = &dp_genl_families[i]; 1858 1859 f->family->ops = f->ops; 1860 f->family->n_ops = f->n_ops; 1861 f->family->mcgrps = f->group; 1862 f->family->n_mcgrps = f->group ? 1 : 0; 1863 err = genl_register_family(f->family); 1864 if (err) 1865 goto error; 1866 n_registered++; 1867 } 1868 1869 return 0; 1870 1871 error: 1872 dp_unregister_genl(n_registered); 1873 return err; 1874 } 1875 1876 static int __net_init ovs_init_net(struct net *net) 1877 { 1878 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1879 1880 INIT_LIST_HEAD(&ovs_net->dps); 1881 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 1882 return 0; 1883 } 1884 1885 static void __net_exit ovs_exit_net(struct net *net) 1886 { 1887 struct datapath *dp, *dp_next; 1888 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1889 1890 ovs_lock(); 1891 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 1892 __dp_destroy(dp); 1893 ovs_unlock(); 1894 1895 cancel_work_sync(&ovs_net->dp_notify_work); 1896 } 1897 1898 static struct pernet_operations ovs_net_ops = { 1899 .init = ovs_init_net, 1900 .exit = ovs_exit_net, 1901 .id = &ovs_net_id, 1902 .size = sizeof(struct ovs_net), 1903 }; 1904 1905 static int __init dp_init(void) 1906 { 1907 int err; 1908 1909 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); 1910 1911 pr_info("Open vSwitch switching datapath\n"); 1912 1913 err = ovs_flow_init(); 1914 if (err) 1915 goto error; 1916 1917 err = ovs_vport_init(); 1918 if (err) 1919 goto error_flow_exit; 1920 1921 err = register_pernet_device(&ovs_net_ops); 1922 if (err) 1923 goto error_vport_exit; 1924 1925 err = register_netdevice_notifier(&ovs_dp_device_notifier); 1926 if (err) 1927 goto error_netns_exit; 1928 1929 err = dp_register_genl(); 1930 if (err < 0) 1931 goto error_unreg_notifier; 1932 1933 return 0; 1934 1935 error_unreg_notifier: 1936 unregister_netdevice_notifier(&ovs_dp_device_notifier); 1937 error_netns_exit: 1938 unregister_pernet_device(&ovs_net_ops); 1939 error_vport_exit: 1940 ovs_vport_exit(); 1941 error_flow_exit: 1942 ovs_flow_exit(); 1943 error: 1944 return err; 1945 } 1946 1947 static void dp_cleanup(void) 1948 { 1949 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 1950 unregister_netdevice_notifier(&ovs_dp_device_notifier); 1951 unregister_pernet_device(&ovs_net_ops); 1952 rcu_barrier(); 1953 ovs_vport_exit(); 1954 ovs_flow_exit(); 1955 } 1956 1957 module_init(dp_init); 1958 module_exit(dp_cleanup); 1959 1960 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 1961 MODULE_LICENSE("GPL"); 1962