1 /* 2 * Copyright (c) 2007-2014 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/genetlink.h> 51 #include <net/genetlink.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 struct genl_family dp_packet_genl_family; 66 static struct genl_family dp_flow_genl_family; 67 static struct genl_family dp_datapath_genl_family; 68 69 static const struct genl_multicast_group ovs_dp_flow_multicast_group = { 70 .name = OVS_FLOW_MCGROUP, 71 }; 72 73 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = { 74 .name = OVS_DATAPATH_MCGROUP, 75 }; 76 77 static const struct genl_multicast_group ovs_dp_vport_multicast_group = { 78 .name = OVS_VPORT_MCGROUP, 79 }; 80 81 /* Check if need to build a reply message. 82 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */ 83 static bool ovs_must_notify(struct genl_info *info, 84 const struct genl_multicast_group *grp) 85 { 86 return info->nlhdr->nlmsg_flags & NLM_F_ECHO || 87 netlink_has_listeners(genl_info_net(info)->genl_sock, 0); 88 } 89 90 static void ovs_notify(struct genl_family *family, 91 struct sk_buff *skb, struct genl_info *info) 92 { 93 genl_notify(family, skb, genl_info_net(info), info->snd_portid, 94 0, info->nlhdr, GFP_KERNEL); 95 } 96 97 /** 98 * DOC: Locking: 99 * 100 * All writes e.g. Writes to device state (add/remove datapath, port, set 101 * operations on vports, etc.), Writes to other state (flow table 102 * modifications, set miscellaneous datapath parameters, etc.) are protected 103 * by ovs_lock. 104 * 105 * Reads are protected by RCU. 106 * 107 * There are a few special cases (mostly stats) that have their own 108 * synchronization but they nest under all of above and don't interact with 109 * each other. 110 * 111 * The RTNL lock nests inside ovs_mutex. 112 */ 113 114 static DEFINE_MUTEX(ovs_mutex); 115 116 void ovs_lock(void) 117 { 118 mutex_lock(&ovs_mutex); 119 } 120 121 void ovs_unlock(void) 122 { 123 mutex_unlock(&ovs_mutex); 124 } 125 126 #ifdef CONFIG_LOCKDEP 127 int lockdep_ovsl_is_held(void) 128 { 129 if (debug_locks) 130 return lockdep_is_held(&ovs_mutex); 131 else 132 return 1; 133 } 134 #endif 135 136 static struct vport *new_vport(const struct vport_parms *); 137 static int queue_gso_packets(struct datapath *dp, struct sk_buff *, 138 const struct dp_upcall_info *); 139 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *, 140 const struct dp_upcall_info *); 141 142 /* Must be called with rcu_read_lock or ovs_mutex. */ 143 static struct datapath *get_dp(struct net *net, int dp_ifindex) 144 { 145 struct datapath *dp = NULL; 146 struct net_device *dev; 147 148 rcu_read_lock(); 149 dev = dev_get_by_index_rcu(net, dp_ifindex); 150 if (dev) { 151 struct vport *vport = ovs_internal_dev_get_vport(dev); 152 if (vport) 153 dp = vport->dp; 154 } 155 rcu_read_unlock(); 156 157 return dp; 158 } 159 160 /* Must be called with rcu_read_lock or ovs_mutex. */ 161 static const char *ovs_dp_name(const struct datapath *dp) 162 { 163 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); 164 return vport->ops->get_name(vport); 165 } 166 167 static int get_dpifindex(struct datapath *dp) 168 { 169 struct vport *local; 170 int ifindex; 171 172 rcu_read_lock(); 173 174 local = ovs_vport_rcu(dp, OVSP_LOCAL); 175 if (local) 176 ifindex = netdev_vport_priv(local)->dev->ifindex; 177 else 178 ifindex = 0; 179 180 rcu_read_unlock(); 181 182 return ifindex; 183 } 184 185 static void destroy_dp_rcu(struct rcu_head *rcu) 186 { 187 struct datapath *dp = container_of(rcu, struct datapath, rcu); 188 189 free_percpu(dp->stats_percpu); 190 release_net(ovs_dp_get_net(dp)); 191 kfree(dp->ports); 192 kfree(dp); 193 } 194 195 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 196 u16 port_no) 197 { 198 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 199 } 200 201 /* Called with ovs_mutex or RCU read lock. */ 202 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 203 { 204 struct vport *vport; 205 struct hlist_head *head; 206 207 head = vport_hash_bucket(dp, port_no); 208 hlist_for_each_entry_rcu(vport, head, dp_hash_node) { 209 if (vport->port_no == port_no) 210 return vport; 211 } 212 return NULL; 213 } 214 215 /* Called with ovs_mutex. */ 216 static struct vport *new_vport(const struct vport_parms *parms) 217 { 218 struct vport *vport; 219 220 vport = ovs_vport_add(parms); 221 if (!IS_ERR(vport)) { 222 struct datapath *dp = parms->dp; 223 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 224 225 hlist_add_head_rcu(&vport->dp_hash_node, head); 226 } 227 return vport; 228 } 229 230 void ovs_dp_detach_port(struct vport *p) 231 { 232 ASSERT_OVSL(); 233 234 /* First drop references to device. */ 235 hlist_del_rcu(&p->dp_hash_node); 236 237 /* Then destroy it. */ 238 ovs_vport_del(p); 239 } 240 241 /* Must be called with rcu_read_lock. */ 242 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb) 243 { 244 struct datapath *dp = p->dp; 245 struct sw_flow *flow; 246 struct dp_stats_percpu *stats; 247 struct sw_flow_key key; 248 u64 *stats_counter; 249 u32 n_mask_hit; 250 int error; 251 252 stats = this_cpu_ptr(dp->stats_percpu); 253 254 /* Extract flow from 'skb' into 'key'. */ 255 error = ovs_flow_extract(skb, p->port_no, &key); 256 if (unlikely(error)) { 257 kfree_skb(skb); 258 return; 259 } 260 261 /* Look up flow. */ 262 flow = ovs_flow_tbl_lookup_stats(&dp->table, &key, &n_mask_hit); 263 if (unlikely(!flow)) { 264 struct dp_upcall_info upcall; 265 266 upcall.cmd = OVS_PACKET_CMD_MISS; 267 upcall.key = &key; 268 upcall.userdata = NULL; 269 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 270 ovs_dp_upcall(dp, skb, &upcall); 271 consume_skb(skb); 272 stats_counter = &stats->n_missed; 273 goto out; 274 } 275 276 OVS_CB(skb)->flow = flow; 277 OVS_CB(skb)->pkt_key = &key; 278 279 ovs_flow_stats_update(OVS_CB(skb)->flow, key.tp.flags, skb); 280 ovs_execute_actions(dp, skb); 281 stats_counter = &stats->n_hit; 282 283 out: 284 /* Update datapath statistics. */ 285 u64_stats_update_begin(&stats->syncp); 286 (*stats_counter)++; 287 stats->n_mask_hit += n_mask_hit; 288 u64_stats_update_end(&stats->syncp); 289 } 290 291 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 292 const struct dp_upcall_info *upcall_info) 293 { 294 struct dp_stats_percpu *stats; 295 int err; 296 297 if (upcall_info->portid == 0) { 298 err = -ENOTCONN; 299 goto err; 300 } 301 302 if (!skb_is_gso(skb)) 303 err = queue_userspace_packet(dp, skb, upcall_info); 304 else 305 err = queue_gso_packets(dp, skb, upcall_info); 306 if (err) 307 goto err; 308 309 return 0; 310 311 err: 312 stats = this_cpu_ptr(dp->stats_percpu); 313 314 u64_stats_update_begin(&stats->syncp); 315 stats->n_lost++; 316 u64_stats_update_end(&stats->syncp); 317 318 return err; 319 } 320 321 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 322 const struct dp_upcall_info *upcall_info) 323 { 324 unsigned short gso_type = skb_shinfo(skb)->gso_type; 325 struct dp_upcall_info later_info; 326 struct sw_flow_key later_key; 327 struct sk_buff *segs, *nskb; 328 int err; 329 330 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 331 if (IS_ERR(segs)) 332 return PTR_ERR(segs); 333 334 /* Queue all of the segments. */ 335 skb = segs; 336 do { 337 err = queue_userspace_packet(dp, skb, upcall_info); 338 if (err) 339 break; 340 341 if (skb == segs && gso_type & SKB_GSO_UDP) { 342 /* The initial flow key extracted by ovs_flow_extract() 343 * in this case is for a first fragment, so we need to 344 * properly mark later fragments. 345 */ 346 later_key = *upcall_info->key; 347 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 348 349 later_info = *upcall_info; 350 later_info.key = &later_key; 351 upcall_info = &later_info; 352 } 353 } while ((skb = skb->next)); 354 355 /* Free all of the segments. */ 356 skb = segs; 357 do { 358 nskb = skb->next; 359 if (err) 360 kfree_skb(skb); 361 else 362 consume_skb(skb); 363 } while ((skb = nskb)); 364 return err; 365 } 366 367 static size_t key_attr_size(void) 368 { 369 return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */ 370 + nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */ 371 + nla_total_size(8) /* OVS_TUNNEL_KEY_ATTR_ID */ 372 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */ 373 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */ 374 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TOS */ 375 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TTL */ 376 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */ 377 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_CSUM */ 378 + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */ 379 + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */ 380 + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */ 381 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */ 382 + nla_total_size(4) /* OVS_KEY_ATTR_8021Q */ 383 + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */ 384 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */ 385 + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */ 386 + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */ 387 + nla_total_size(28); /* OVS_KEY_ATTR_ND */ 388 } 389 390 static size_t upcall_msg_size(const struct nlattr *userdata, 391 unsigned int hdrlen) 392 { 393 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 394 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 395 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */ 396 397 /* OVS_PACKET_ATTR_USERDATA */ 398 if (userdata) 399 size += NLA_ALIGN(userdata->nla_len); 400 401 return size; 402 } 403 404 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 405 const struct dp_upcall_info *upcall_info) 406 { 407 struct ovs_header *upcall; 408 struct sk_buff *nskb = NULL; 409 struct sk_buff *user_skb; /* to be queued to userspace */ 410 struct nlattr *nla; 411 struct genl_info info = { 412 .dst_sk = ovs_dp_get_net(dp)->genl_sock, 413 .snd_portid = upcall_info->portid, 414 }; 415 size_t len; 416 unsigned int hlen; 417 int err, dp_ifindex; 418 419 dp_ifindex = get_dpifindex(dp); 420 if (!dp_ifindex) 421 return -ENODEV; 422 423 if (vlan_tx_tag_present(skb)) { 424 nskb = skb_clone(skb, GFP_ATOMIC); 425 if (!nskb) 426 return -ENOMEM; 427 428 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb)); 429 if (!nskb) 430 return -ENOMEM; 431 432 nskb->vlan_tci = 0; 433 skb = nskb; 434 } 435 436 if (nla_attr_size(skb->len) > USHRT_MAX) { 437 err = -EFBIG; 438 goto out; 439 } 440 441 /* Complete checksum if needed */ 442 if (skb->ip_summed == CHECKSUM_PARTIAL && 443 (err = skb_checksum_help(skb))) 444 goto out; 445 446 /* Older versions of OVS user space enforce alignment of the last 447 * Netlink attribute to NLA_ALIGNTO which would require extensive 448 * padding logic. Only perform zerocopy if padding is not required. 449 */ 450 if (dp->user_features & OVS_DP_F_UNALIGNED) 451 hlen = skb_zerocopy_headlen(skb); 452 else 453 hlen = skb->len; 454 455 len = upcall_msg_size(upcall_info->userdata, hlen); 456 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC); 457 if (!user_skb) { 458 err = -ENOMEM; 459 goto out; 460 } 461 462 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 463 0, upcall_info->cmd); 464 upcall->dp_ifindex = dp_ifindex; 465 466 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY); 467 err = ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb); 468 BUG_ON(err); 469 nla_nest_end(user_skb, nla); 470 471 if (upcall_info->userdata) 472 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 473 nla_len(upcall_info->userdata), 474 nla_data(upcall_info->userdata)); 475 476 /* Only reserve room for attribute header, packet data is added 477 * in skb_zerocopy() */ 478 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 479 err = -ENOBUFS; 480 goto out; 481 } 482 nla->nla_len = nla_attr_size(skb->len); 483 484 err = skb_zerocopy(user_skb, skb, skb->len, hlen); 485 if (err) 486 goto out; 487 488 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 489 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 490 size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len; 491 492 if (plen > 0) 493 memset(skb_put(user_skb, plen), 0, plen); 494 } 495 496 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 497 498 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 499 out: 500 if (err) 501 skb_tx_error(skb); 502 kfree_skb(nskb); 503 return err; 504 } 505 506 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 507 { 508 struct ovs_header *ovs_header = info->userhdr; 509 struct nlattr **a = info->attrs; 510 struct sw_flow_actions *acts; 511 struct sk_buff *packet; 512 struct sw_flow *flow; 513 struct datapath *dp; 514 struct ethhdr *eth; 515 int len; 516 int err; 517 518 err = -EINVAL; 519 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 520 !a[OVS_PACKET_ATTR_ACTIONS]) 521 goto err; 522 523 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 524 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 525 err = -ENOMEM; 526 if (!packet) 527 goto err; 528 skb_reserve(packet, NET_IP_ALIGN); 529 530 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 531 532 skb_reset_mac_header(packet); 533 eth = eth_hdr(packet); 534 535 /* Normally, setting the skb 'protocol' field would be handled by a 536 * call to eth_type_trans(), but it assumes there's a sending 537 * device, which we may not have. */ 538 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) 539 packet->protocol = eth->h_proto; 540 else 541 packet->protocol = htons(ETH_P_802_2); 542 543 /* Build an sw_flow for sending this packet. */ 544 flow = ovs_flow_alloc(); 545 err = PTR_ERR(flow); 546 if (IS_ERR(flow)) 547 goto err_kfree_skb; 548 549 err = ovs_flow_extract(packet, -1, &flow->key); 550 if (err) 551 goto err_flow_free; 552 553 err = ovs_nla_get_flow_metadata(flow, a[OVS_PACKET_ATTR_KEY]); 554 if (err) 555 goto err_flow_free; 556 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS])); 557 err = PTR_ERR(acts); 558 if (IS_ERR(acts)) 559 goto err_flow_free; 560 561 err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS], 562 &flow->key, 0, &acts); 563 rcu_assign_pointer(flow->sf_acts, acts); 564 if (err) 565 goto err_flow_free; 566 567 OVS_CB(packet)->flow = flow; 568 OVS_CB(packet)->pkt_key = &flow->key; 569 packet->priority = flow->key.phy.priority; 570 packet->mark = flow->key.phy.skb_mark; 571 572 rcu_read_lock(); 573 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 574 err = -ENODEV; 575 if (!dp) 576 goto err_unlock; 577 578 local_bh_disable(); 579 err = ovs_execute_actions(dp, packet); 580 local_bh_enable(); 581 rcu_read_unlock(); 582 583 ovs_flow_free(flow, false); 584 return err; 585 586 err_unlock: 587 rcu_read_unlock(); 588 err_flow_free: 589 ovs_flow_free(flow, false); 590 err_kfree_skb: 591 kfree_skb(packet); 592 err: 593 return err; 594 } 595 596 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 597 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 598 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 599 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 600 }; 601 602 static const struct genl_ops dp_packet_genl_ops[] = { 603 { .cmd = OVS_PACKET_CMD_EXECUTE, 604 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 605 .policy = packet_policy, 606 .doit = ovs_packet_cmd_execute 607 } 608 }; 609 610 static struct genl_family dp_packet_genl_family = { 611 .id = GENL_ID_GENERATE, 612 .hdrsize = sizeof(struct ovs_header), 613 .name = OVS_PACKET_FAMILY, 614 .version = OVS_PACKET_VERSION, 615 .maxattr = OVS_PACKET_ATTR_MAX, 616 .netnsok = true, 617 .parallel_ops = true, 618 .ops = dp_packet_genl_ops, 619 .n_ops = ARRAY_SIZE(dp_packet_genl_ops), 620 }; 621 622 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats, 623 struct ovs_dp_megaflow_stats *mega_stats) 624 { 625 int i; 626 627 memset(mega_stats, 0, sizeof(*mega_stats)); 628 629 stats->n_flows = ovs_flow_tbl_count(&dp->table); 630 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 631 632 stats->n_hit = stats->n_missed = stats->n_lost = 0; 633 634 for_each_possible_cpu(i) { 635 const struct dp_stats_percpu *percpu_stats; 636 struct dp_stats_percpu local_stats; 637 unsigned int start; 638 639 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 640 641 do { 642 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 643 local_stats = *percpu_stats; 644 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 645 646 stats->n_hit += local_stats.n_hit; 647 stats->n_missed += local_stats.n_missed; 648 stats->n_lost += local_stats.n_lost; 649 mega_stats->n_mask_hit += local_stats.n_mask_hit; 650 } 651 } 652 653 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts) 654 { 655 return NLMSG_ALIGN(sizeof(struct ovs_header)) 656 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */ 657 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */ 658 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 659 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 660 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */ 661 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */ 662 } 663 664 /* Called with ovs_mutex or RCU read lock. */ 665 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 666 struct sk_buff *skb, u32 portid, 667 u32 seq, u32 flags, u8 cmd) 668 { 669 const int skb_orig_len = skb->len; 670 struct nlattr *start; 671 struct ovs_flow_stats stats; 672 __be16 tcp_flags; 673 unsigned long used; 674 struct ovs_header *ovs_header; 675 struct nlattr *nla; 676 int err; 677 678 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd); 679 if (!ovs_header) 680 return -EMSGSIZE; 681 682 ovs_header->dp_ifindex = dp_ifindex; 683 684 /* Fill flow key. */ 685 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY); 686 if (!nla) 687 goto nla_put_failure; 688 689 err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb); 690 if (err) 691 goto error; 692 nla_nest_end(skb, nla); 693 694 nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK); 695 if (!nla) 696 goto nla_put_failure; 697 698 err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb); 699 if (err) 700 goto error; 701 702 nla_nest_end(skb, nla); 703 704 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 705 706 if (used && 707 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used))) 708 goto nla_put_failure; 709 710 if (stats.n_packets && 711 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats)) 712 goto nla_put_failure; 713 714 if ((u8)ntohs(tcp_flags) && 715 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 716 goto nla_put_failure; 717 718 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 719 * this is the first flow to be dumped into 'skb'. This is unusual for 720 * Netlink but individual action lists can be longer than 721 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 722 * The userspace caller can always fetch the actions separately if it 723 * really wants them. (Most userspace callers in fact don't care.) 724 * 725 * This can only fail for dump operations because the skb is always 726 * properly sized for single flows. 727 */ 728 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS); 729 if (start) { 730 const struct sw_flow_actions *sf_acts; 731 732 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 733 err = ovs_nla_put_actions(sf_acts->actions, 734 sf_acts->actions_len, skb); 735 736 if (!err) 737 nla_nest_end(skb, start); 738 else { 739 if (skb_orig_len) 740 goto error; 741 742 nla_nest_cancel(skb, start); 743 } 744 } else if (skb_orig_len) 745 goto nla_put_failure; 746 747 return genlmsg_end(skb, ovs_header); 748 749 nla_put_failure: 750 err = -EMSGSIZE; 751 error: 752 genlmsg_cancel(skb, ovs_header); 753 return err; 754 } 755 756 /* May not be called with RCU read lock. */ 757 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 758 struct genl_info *info, 759 bool always) 760 { 761 struct sk_buff *skb; 762 763 if (!always && !ovs_must_notify(info, &ovs_dp_flow_multicast_group)) 764 return NULL; 765 766 skb = genlmsg_new_unicast(ovs_flow_cmd_msg_size(acts), info, GFP_KERNEL); 767 if (!skb) 768 return ERR_PTR(-ENOMEM); 769 770 return skb; 771 } 772 773 /* Called with ovs_mutex. */ 774 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 775 int dp_ifindex, 776 struct genl_info *info, u8 cmd, 777 bool always) 778 { 779 struct sk_buff *skb; 780 int retval; 781 782 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), info, 783 always); 784 if (IS_ERR_OR_NULL(skb)) 785 return skb; 786 787 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 788 info->snd_portid, info->snd_seq, 0, 789 cmd); 790 BUG_ON(retval < 0); 791 return skb; 792 } 793 794 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 795 { 796 struct nlattr **a = info->attrs; 797 struct ovs_header *ovs_header = info->userhdr; 798 struct sw_flow *flow, *new_flow; 799 struct sw_flow_mask mask; 800 struct sk_buff *reply; 801 struct datapath *dp; 802 struct sw_flow_actions *acts; 803 struct sw_flow_match match; 804 int error; 805 806 /* Must have key and actions. */ 807 error = -EINVAL; 808 if (!a[OVS_FLOW_ATTR_KEY]) 809 goto error; 810 if (!a[OVS_FLOW_ATTR_ACTIONS]) 811 goto error; 812 813 /* Most of the time we need to allocate a new flow, do it before 814 * locking. 815 */ 816 new_flow = ovs_flow_alloc(); 817 if (IS_ERR(new_flow)) { 818 error = PTR_ERR(new_flow); 819 goto error; 820 } 821 822 /* Extract key. */ 823 ovs_match_init(&match, &new_flow->unmasked_key, &mask); 824 error = ovs_nla_get_match(&match, 825 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]); 826 if (error) 827 goto err_kfree_flow; 828 829 ovs_flow_mask_key(&new_flow->key, &new_flow->unmasked_key, &mask); 830 831 /* Validate actions. */ 832 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS])); 833 error = PTR_ERR(acts); 834 if (IS_ERR(acts)) 835 goto err_kfree_flow; 836 837 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &new_flow->key, 838 0, &acts); 839 if (error) { 840 OVS_NLERR("Flow actions may not be safe on all matching packets.\n"); 841 goto err_kfree_acts; 842 } 843 844 reply = ovs_flow_cmd_alloc_info(acts, info, false); 845 if (IS_ERR(reply)) { 846 error = PTR_ERR(reply); 847 goto err_kfree_acts; 848 } 849 850 ovs_lock(); 851 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 852 if (unlikely(!dp)) { 853 error = -ENODEV; 854 goto err_unlock_ovs; 855 } 856 /* Check if this is a duplicate flow */ 857 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->unmasked_key); 858 if (likely(!flow)) { 859 rcu_assign_pointer(new_flow->sf_acts, acts); 860 861 /* Put flow in bucket. */ 862 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 863 if (unlikely(error)) { 864 acts = NULL; 865 goto err_unlock_ovs; 866 } 867 868 if (unlikely(reply)) { 869 error = ovs_flow_cmd_fill_info(new_flow, 870 ovs_header->dp_ifindex, 871 reply, info->snd_portid, 872 info->snd_seq, 0, 873 OVS_FLOW_CMD_NEW); 874 BUG_ON(error < 0); 875 } 876 ovs_unlock(); 877 } else { 878 struct sw_flow_actions *old_acts; 879 880 /* Bail out if we're not allowed to modify an existing flow. 881 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 882 * because Generic Netlink treats the latter as a dump 883 * request. We also accept NLM_F_EXCL in case that bug ever 884 * gets fixed. 885 */ 886 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 887 | NLM_F_EXCL))) { 888 error = -EEXIST; 889 goto err_unlock_ovs; 890 } 891 /* The unmasked key has to be the same for flow updates. */ 892 if (unlikely(!ovs_flow_cmp_unmasked_key(flow, &match))) { 893 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 894 if (!flow) { 895 error = -ENOENT; 896 goto err_unlock_ovs; 897 } 898 } 899 /* Update actions. */ 900 old_acts = ovsl_dereference(flow->sf_acts); 901 rcu_assign_pointer(flow->sf_acts, acts); 902 903 if (unlikely(reply)) { 904 error = ovs_flow_cmd_fill_info(flow, 905 ovs_header->dp_ifindex, 906 reply, info->snd_portid, 907 info->snd_seq, 0, 908 OVS_FLOW_CMD_NEW); 909 BUG_ON(error < 0); 910 } 911 ovs_unlock(); 912 913 ovs_nla_free_flow_actions(old_acts); 914 ovs_flow_free(new_flow, false); 915 } 916 917 if (reply) 918 ovs_notify(&dp_flow_genl_family, reply, info); 919 return 0; 920 921 err_unlock_ovs: 922 ovs_unlock(); 923 kfree_skb(reply); 924 err_kfree_acts: 925 kfree(acts); 926 err_kfree_flow: 927 ovs_flow_free(new_flow, false); 928 error: 929 return error; 930 } 931 932 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 933 { 934 struct nlattr **a = info->attrs; 935 struct ovs_header *ovs_header = info->userhdr; 936 struct sw_flow_key key, masked_key; 937 struct sw_flow *flow; 938 struct sw_flow_mask mask; 939 struct sk_buff *reply = NULL; 940 struct datapath *dp; 941 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 942 struct sw_flow_match match; 943 int error; 944 945 /* Extract key. */ 946 error = -EINVAL; 947 if (!a[OVS_FLOW_ATTR_KEY]) 948 goto error; 949 950 ovs_match_init(&match, &key, &mask); 951 error = ovs_nla_get_match(&match, 952 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]); 953 if (error) 954 goto error; 955 956 /* Validate actions. */ 957 if (a[OVS_FLOW_ATTR_ACTIONS]) { 958 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS])); 959 error = PTR_ERR(acts); 960 if (IS_ERR(acts)) 961 goto error; 962 963 ovs_flow_mask_key(&masked_key, &key, &mask); 964 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], 965 &masked_key, 0, &acts); 966 if (error) { 967 OVS_NLERR("Flow actions may not be safe on all matching packets.\n"); 968 goto err_kfree_acts; 969 } 970 } 971 972 /* Can allocate before locking if have acts. */ 973 if (acts) { 974 reply = ovs_flow_cmd_alloc_info(acts, info, false); 975 if (IS_ERR(reply)) { 976 error = PTR_ERR(reply); 977 goto err_kfree_acts; 978 } 979 } 980 981 ovs_lock(); 982 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 983 if (unlikely(!dp)) { 984 error = -ENODEV; 985 goto err_unlock_ovs; 986 } 987 /* Check that the flow exists. */ 988 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 989 if (unlikely(!flow)) { 990 error = -ENOENT; 991 goto err_unlock_ovs; 992 } 993 994 /* Update actions, if present. */ 995 if (likely(acts)) { 996 old_acts = ovsl_dereference(flow->sf_acts); 997 rcu_assign_pointer(flow->sf_acts, acts); 998 999 if (unlikely(reply)) { 1000 error = ovs_flow_cmd_fill_info(flow, 1001 ovs_header->dp_ifindex, 1002 reply, info->snd_portid, 1003 info->snd_seq, 0, 1004 OVS_FLOW_CMD_NEW); 1005 BUG_ON(error < 0); 1006 } 1007 } else { 1008 /* Could not alloc without acts before locking. */ 1009 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1010 info, OVS_FLOW_CMD_NEW, false); 1011 if (unlikely(IS_ERR(reply))) { 1012 error = PTR_ERR(reply); 1013 goto err_unlock_ovs; 1014 } 1015 } 1016 1017 /* Clear stats. */ 1018 if (a[OVS_FLOW_ATTR_CLEAR]) 1019 ovs_flow_stats_clear(flow); 1020 ovs_unlock(); 1021 1022 if (reply) 1023 ovs_notify(&dp_flow_genl_family, reply, info); 1024 if (old_acts) 1025 ovs_nla_free_flow_actions(old_acts); 1026 1027 return 0; 1028 1029 err_unlock_ovs: 1030 ovs_unlock(); 1031 kfree_skb(reply); 1032 err_kfree_acts: 1033 kfree(acts); 1034 error: 1035 return error; 1036 } 1037 1038 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1039 { 1040 struct nlattr **a = info->attrs; 1041 struct ovs_header *ovs_header = info->userhdr; 1042 struct sw_flow_key key; 1043 struct sk_buff *reply; 1044 struct sw_flow *flow; 1045 struct datapath *dp; 1046 struct sw_flow_match match; 1047 int err; 1048 1049 if (!a[OVS_FLOW_ATTR_KEY]) { 1050 OVS_NLERR("Flow get message rejected, Key attribute missing.\n"); 1051 return -EINVAL; 1052 } 1053 1054 ovs_match_init(&match, &key, NULL); 1055 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL); 1056 if (err) 1057 return err; 1058 1059 ovs_lock(); 1060 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1061 if (!dp) { 1062 err = -ENODEV; 1063 goto unlock; 1064 } 1065 1066 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1067 if (!flow) { 1068 err = -ENOENT; 1069 goto unlock; 1070 } 1071 1072 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1073 OVS_FLOW_CMD_NEW, true); 1074 if (IS_ERR(reply)) { 1075 err = PTR_ERR(reply); 1076 goto unlock; 1077 } 1078 1079 ovs_unlock(); 1080 return genlmsg_reply(reply, info); 1081 unlock: 1082 ovs_unlock(); 1083 return err; 1084 } 1085 1086 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1087 { 1088 struct nlattr **a = info->attrs; 1089 struct ovs_header *ovs_header = info->userhdr; 1090 struct sw_flow_key key; 1091 struct sk_buff *reply; 1092 struct sw_flow *flow; 1093 struct datapath *dp; 1094 struct sw_flow_match match; 1095 int err; 1096 1097 if (likely(a[OVS_FLOW_ATTR_KEY])) { 1098 ovs_match_init(&match, &key, NULL); 1099 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL); 1100 if (unlikely(err)) 1101 return err; 1102 } 1103 1104 ovs_lock(); 1105 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1106 if (unlikely(!dp)) { 1107 err = -ENODEV; 1108 goto unlock; 1109 } 1110 1111 if (unlikely(!a[OVS_FLOW_ATTR_KEY])) { 1112 err = ovs_flow_tbl_flush(&dp->table); 1113 goto unlock; 1114 } 1115 1116 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1117 if (unlikely(!flow)) { 1118 err = -ENOENT; 1119 goto unlock; 1120 } 1121 1122 ovs_flow_tbl_remove(&dp->table, flow); 1123 ovs_unlock(); 1124 1125 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1126 info, false); 1127 if (likely(reply)) { 1128 if (likely(!IS_ERR(reply))) { 1129 rcu_read_lock(); /*To keep RCU checker happy. */ 1130 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1131 reply, info->snd_portid, 1132 info->snd_seq, 0, 1133 OVS_FLOW_CMD_DEL); 1134 rcu_read_unlock(); 1135 BUG_ON(err < 0); 1136 1137 ovs_notify(&dp_flow_genl_family, reply, info); 1138 } else { 1139 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply)); 1140 } 1141 } 1142 1143 ovs_flow_free(flow, true); 1144 return 0; 1145 unlock: 1146 ovs_unlock(); 1147 return err; 1148 } 1149 1150 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1151 { 1152 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1153 struct table_instance *ti; 1154 struct datapath *dp; 1155 1156 rcu_read_lock(); 1157 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1158 if (!dp) { 1159 rcu_read_unlock(); 1160 return -ENODEV; 1161 } 1162 1163 ti = rcu_dereference(dp->table.ti); 1164 for (;;) { 1165 struct sw_flow *flow; 1166 u32 bucket, obj; 1167 1168 bucket = cb->args[0]; 1169 obj = cb->args[1]; 1170 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1171 if (!flow) 1172 break; 1173 1174 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1175 NETLINK_CB(cb->skb).portid, 1176 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1177 OVS_FLOW_CMD_NEW) < 0) 1178 break; 1179 1180 cb->args[0] = bucket; 1181 cb->args[1] = obj; 1182 } 1183 rcu_read_unlock(); 1184 return skb->len; 1185 } 1186 1187 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1188 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1189 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1190 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1191 }; 1192 1193 static const struct genl_ops dp_flow_genl_ops[] = { 1194 { .cmd = OVS_FLOW_CMD_NEW, 1195 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1196 .policy = flow_policy, 1197 .doit = ovs_flow_cmd_new 1198 }, 1199 { .cmd = OVS_FLOW_CMD_DEL, 1200 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1201 .policy = flow_policy, 1202 .doit = ovs_flow_cmd_del 1203 }, 1204 { .cmd = OVS_FLOW_CMD_GET, 1205 .flags = 0, /* OK for unprivileged users. */ 1206 .policy = flow_policy, 1207 .doit = ovs_flow_cmd_get, 1208 .dumpit = ovs_flow_cmd_dump 1209 }, 1210 { .cmd = OVS_FLOW_CMD_SET, 1211 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1212 .policy = flow_policy, 1213 .doit = ovs_flow_cmd_set, 1214 }, 1215 }; 1216 1217 static struct genl_family dp_flow_genl_family = { 1218 .id = GENL_ID_GENERATE, 1219 .hdrsize = sizeof(struct ovs_header), 1220 .name = OVS_FLOW_FAMILY, 1221 .version = OVS_FLOW_VERSION, 1222 .maxattr = OVS_FLOW_ATTR_MAX, 1223 .netnsok = true, 1224 .parallel_ops = true, 1225 .ops = dp_flow_genl_ops, 1226 .n_ops = ARRAY_SIZE(dp_flow_genl_ops), 1227 .mcgrps = &ovs_dp_flow_multicast_group, 1228 .n_mcgrps = 1, 1229 }; 1230 1231 static size_t ovs_dp_cmd_msg_size(void) 1232 { 1233 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1234 1235 msgsize += nla_total_size(IFNAMSIZ); 1236 msgsize += nla_total_size(sizeof(struct ovs_dp_stats)); 1237 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats)); 1238 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1239 1240 return msgsize; 1241 } 1242 1243 /* Called with ovs_mutex or RCU read lock. */ 1244 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1245 u32 portid, u32 seq, u32 flags, u8 cmd) 1246 { 1247 struct ovs_header *ovs_header; 1248 struct ovs_dp_stats dp_stats; 1249 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1250 int err; 1251 1252 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1253 flags, cmd); 1254 if (!ovs_header) 1255 goto error; 1256 1257 ovs_header->dp_ifindex = get_dpifindex(dp); 1258 1259 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1260 if (err) 1261 goto nla_put_failure; 1262 1263 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1264 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1265 &dp_stats)) 1266 goto nla_put_failure; 1267 1268 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1269 sizeof(struct ovs_dp_megaflow_stats), 1270 &dp_megaflow_stats)) 1271 goto nla_put_failure; 1272 1273 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1274 goto nla_put_failure; 1275 1276 return genlmsg_end(skb, ovs_header); 1277 1278 nla_put_failure: 1279 genlmsg_cancel(skb, ovs_header); 1280 error: 1281 return -EMSGSIZE; 1282 } 1283 1284 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info) 1285 { 1286 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL); 1287 } 1288 1289 /* Called with rcu_read_lock or ovs_mutex. */ 1290 static struct datapath *lookup_datapath(struct net *net, 1291 struct ovs_header *ovs_header, 1292 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1293 { 1294 struct datapath *dp; 1295 1296 if (!a[OVS_DP_ATTR_NAME]) 1297 dp = get_dp(net, ovs_header->dp_ifindex); 1298 else { 1299 struct vport *vport; 1300 1301 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1302 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1303 } 1304 return dp ? dp : ERR_PTR(-ENODEV); 1305 } 1306 1307 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info) 1308 { 1309 struct datapath *dp; 1310 1311 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1312 if (IS_ERR(dp)) 1313 return; 1314 1315 WARN(dp->user_features, "Dropping previously announced user features\n"); 1316 dp->user_features = 0; 1317 } 1318 1319 static void ovs_dp_change(struct datapath *dp, struct nlattr **a) 1320 { 1321 if (a[OVS_DP_ATTR_USER_FEATURES]) 1322 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1323 } 1324 1325 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1326 { 1327 struct nlattr **a = info->attrs; 1328 struct vport_parms parms; 1329 struct sk_buff *reply; 1330 struct datapath *dp; 1331 struct vport *vport; 1332 struct ovs_net *ovs_net; 1333 int err, i; 1334 1335 err = -EINVAL; 1336 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1337 goto err; 1338 1339 reply = ovs_dp_cmd_alloc_info(info); 1340 if (!reply) 1341 return -ENOMEM; 1342 1343 err = -ENOMEM; 1344 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1345 if (dp == NULL) 1346 goto err_free_reply; 1347 1348 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk))); 1349 1350 /* Allocate table. */ 1351 err = ovs_flow_tbl_init(&dp->table); 1352 if (err) 1353 goto err_free_dp; 1354 1355 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1356 if (!dp->stats_percpu) { 1357 err = -ENOMEM; 1358 goto err_destroy_table; 1359 } 1360 1361 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head), 1362 GFP_KERNEL); 1363 if (!dp->ports) { 1364 err = -ENOMEM; 1365 goto err_destroy_percpu; 1366 } 1367 1368 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1369 INIT_HLIST_HEAD(&dp->ports[i]); 1370 1371 /* Set up our datapath device. */ 1372 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1373 parms.type = OVS_VPORT_TYPE_INTERNAL; 1374 parms.options = NULL; 1375 parms.dp = dp; 1376 parms.port_no = OVSP_LOCAL; 1377 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1378 1379 ovs_dp_change(dp, a); 1380 1381 /* So far only local changes have been made, now need the lock. */ 1382 ovs_lock(); 1383 1384 vport = new_vport(&parms); 1385 if (IS_ERR(vport)) { 1386 err = PTR_ERR(vport); 1387 if (err == -EBUSY) 1388 err = -EEXIST; 1389 1390 if (err == -EEXIST) { 1391 /* An outdated user space instance that does not understand 1392 * the concept of user_features has attempted to create a new 1393 * datapath and is likely to reuse it. Drop all user features. 1394 */ 1395 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1396 ovs_dp_reset_user_features(skb, info); 1397 } 1398 1399 goto err_destroy_ports_array; 1400 } 1401 1402 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1403 info->snd_seq, 0, OVS_DP_CMD_NEW); 1404 BUG_ON(err < 0); 1405 1406 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1407 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1408 1409 ovs_unlock(); 1410 1411 ovs_notify(&dp_datapath_genl_family, reply, info); 1412 return 0; 1413 1414 err_destroy_ports_array: 1415 ovs_unlock(); 1416 kfree(dp->ports); 1417 err_destroy_percpu: 1418 free_percpu(dp->stats_percpu); 1419 err_destroy_table: 1420 ovs_flow_tbl_destroy(&dp->table, false); 1421 err_free_dp: 1422 release_net(ovs_dp_get_net(dp)); 1423 kfree(dp); 1424 err_free_reply: 1425 kfree_skb(reply); 1426 err: 1427 return err; 1428 } 1429 1430 /* Called with ovs_mutex. */ 1431 static void __dp_destroy(struct datapath *dp) 1432 { 1433 int i; 1434 1435 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1436 struct vport *vport; 1437 struct hlist_node *n; 1438 1439 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1440 if (vport->port_no != OVSP_LOCAL) 1441 ovs_dp_detach_port(vport); 1442 } 1443 1444 list_del_rcu(&dp->list_node); 1445 1446 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1447 * all ports in datapath are destroyed first before freeing datapath. 1448 */ 1449 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1450 1451 /* RCU destroy the flow table */ 1452 ovs_flow_tbl_destroy(&dp->table, true); 1453 1454 call_rcu(&dp->rcu, destroy_dp_rcu); 1455 } 1456 1457 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1458 { 1459 struct sk_buff *reply; 1460 struct datapath *dp; 1461 int err; 1462 1463 reply = ovs_dp_cmd_alloc_info(info); 1464 if (!reply) 1465 return -ENOMEM; 1466 1467 ovs_lock(); 1468 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1469 err = PTR_ERR(dp); 1470 if (IS_ERR(dp)) 1471 goto err_unlock_free; 1472 1473 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1474 info->snd_seq, 0, OVS_DP_CMD_DEL); 1475 BUG_ON(err < 0); 1476 1477 __dp_destroy(dp); 1478 ovs_unlock(); 1479 1480 ovs_notify(&dp_datapath_genl_family, reply, info); 1481 1482 return 0; 1483 1484 err_unlock_free: 1485 ovs_unlock(); 1486 kfree_skb(reply); 1487 return err; 1488 } 1489 1490 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1491 { 1492 struct sk_buff *reply; 1493 struct datapath *dp; 1494 int err; 1495 1496 reply = ovs_dp_cmd_alloc_info(info); 1497 if (!reply) 1498 return -ENOMEM; 1499 1500 ovs_lock(); 1501 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1502 err = PTR_ERR(dp); 1503 if (IS_ERR(dp)) 1504 goto err_unlock_free; 1505 1506 ovs_dp_change(dp, info->attrs); 1507 1508 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1509 info->snd_seq, 0, OVS_DP_CMD_NEW); 1510 BUG_ON(err < 0); 1511 1512 ovs_unlock(); 1513 ovs_notify(&dp_datapath_genl_family, reply, info); 1514 1515 return 0; 1516 1517 err_unlock_free: 1518 ovs_unlock(); 1519 kfree_skb(reply); 1520 return err; 1521 } 1522 1523 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1524 { 1525 struct sk_buff *reply; 1526 struct datapath *dp; 1527 int err; 1528 1529 reply = ovs_dp_cmd_alloc_info(info); 1530 if (!reply) 1531 return -ENOMEM; 1532 1533 rcu_read_lock(); 1534 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1535 if (IS_ERR(dp)) { 1536 err = PTR_ERR(dp); 1537 goto err_unlock_free; 1538 } 1539 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1540 info->snd_seq, 0, OVS_DP_CMD_NEW); 1541 BUG_ON(err < 0); 1542 rcu_read_unlock(); 1543 1544 return genlmsg_reply(reply, info); 1545 1546 err_unlock_free: 1547 rcu_read_unlock(); 1548 kfree_skb(reply); 1549 return err; 1550 } 1551 1552 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1553 { 1554 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1555 struct datapath *dp; 1556 int skip = cb->args[0]; 1557 int i = 0; 1558 1559 rcu_read_lock(); 1560 list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) { 1561 if (i >= skip && 1562 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1563 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1564 OVS_DP_CMD_NEW) < 0) 1565 break; 1566 i++; 1567 } 1568 rcu_read_unlock(); 1569 1570 cb->args[0] = i; 1571 1572 return skb->len; 1573 } 1574 1575 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1576 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1577 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1578 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1579 }; 1580 1581 static const struct genl_ops dp_datapath_genl_ops[] = { 1582 { .cmd = OVS_DP_CMD_NEW, 1583 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1584 .policy = datapath_policy, 1585 .doit = ovs_dp_cmd_new 1586 }, 1587 { .cmd = OVS_DP_CMD_DEL, 1588 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1589 .policy = datapath_policy, 1590 .doit = ovs_dp_cmd_del 1591 }, 1592 { .cmd = OVS_DP_CMD_GET, 1593 .flags = 0, /* OK for unprivileged users. */ 1594 .policy = datapath_policy, 1595 .doit = ovs_dp_cmd_get, 1596 .dumpit = ovs_dp_cmd_dump 1597 }, 1598 { .cmd = OVS_DP_CMD_SET, 1599 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1600 .policy = datapath_policy, 1601 .doit = ovs_dp_cmd_set, 1602 }, 1603 }; 1604 1605 static struct genl_family dp_datapath_genl_family = { 1606 .id = GENL_ID_GENERATE, 1607 .hdrsize = sizeof(struct ovs_header), 1608 .name = OVS_DATAPATH_FAMILY, 1609 .version = OVS_DATAPATH_VERSION, 1610 .maxattr = OVS_DP_ATTR_MAX, 1611 .netnsok = true, 1612 .parallel_ops = true, 1613 .ops = dp_datapath_genl_ops, 1614 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops), 1615 .mcgrps = &ovs_dp_datapath_multicast_group, 1616 .n_mcgrps = 1, 1617 }; 1618 1619 /* Called with ovs_mutex or RCU read lock. */ 1620 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1621 u32 portid, u32 seq, u32 flags, u8 cmd) 1622 { 1623 struct ovs_header *ovs_header; 1624 struct ovs_vport_stats vport_stats; 1625 int err; 1626 1627 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1628 flags, cmd); 1629 if (!ovs_header) 1630 return -EMSGSIZE; 1631 1632 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1633 1634 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1635 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1636 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 1637 vport->ops->get_name(vport))) 1638 goto nla_put_failure; 1639 1640 ovs_vport_get_stats(vport, &vport_stats); 1641 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), 1642 &vport_stats)) 1643 goto nla_put_failure; 1644 1645 if (ovs_vport_get_upcall_portids(vport, skb)) 1646 goto nla_put_failure; 1647 1648 err = ovs_vport_get_options(vport, skb); 1649 if (err == -EMSGSIZE) 1650 goto error; 1651 1652 return genlmsg_end(skb, ovs_header); 1653 1654 nla_put_failure: 1655 err = -EMSGSIZE; 1656 error: 1657 genlmsg_cancel(skb, ovs_header); 1658 return err; 1659 } 1660 1661 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 1662 { 1663 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1664 } 1665 1666 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 1667 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid, 1668 u32 seq, u8 cmd) 1669 { 1670 struct sk_buff *skb; 1671 int retval; 1672 1673 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1674 if (!skb) 1675 return ERR_PTR(-ENOMEM); 1676 1677 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd); 1678 BUG_ON(retval < 0); 1679 1680 return skb; 1681 } 1682 1683 /* Called with ovs_mutex or RCU read lock. */ 1684 static struct vport *lookup_vport(struct net *net, 1685 struct ovs_header *ovs_header, 1686 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1687 { 1688 struct datapath *dp; 1689 struct vport *vport; 1690 1691 if (a[OVS_VPORT_ATTR_NAME]) { 1692 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 1693 if (!vport) 1694 return ERR_PTR(-ENODEV); 1695 if (ovs_header->dp_ifindex && 1696 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 1697 return ERR_PTR(-ENODEV); 1698 return vport; 1699 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 1700 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1701 1702 if (port_no >= DP_MAX_PORTS) 1703 return ERR_PTR(-EFBIG); 1704 1705 dp = get_dp(net, ovs_header->dp_ifindex); 1706 if (!dp) 1707 return ERR_PTR(-ENODEV); 1708 1709 vport = ovs_vport_ovsl_rcu(dp, port_no); 1710 if (!vport) 1711 return ERR_PTR(-ENODEV); 1712 return vport; 1713 } else 1714 return ERR_PTR(-EINVAL); 1715 } 1716 1717 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 1718 { 1719 struct nlattr **a = info->attrs; 1720 struct ovs_header *ovs_header = info->userhdr; 1721 struct vport_parms parms; 1722 struct sk_buff *reply; 1723 struct vport *vport; 1724 struct datapath *dp; 1725 u32 port_no; 1726 int err; 1727 1728 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 1729 !a[OVS_VPORT_ATTR_UPCALL_PID]) 1730 return -EINVAL; 1731 1732 port_no = a[OVS_VPORT_ATTR_PORT_NO] 1733 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 1734 if (port_no >= DP_MAX_PORTS) 1735 return -EFBIG; 1736 1737 reply = ovs_vport_cmd_alloc_info(); 1738 if (!reply) 1739 return -ENOMEM; 1740 1741 ovs_lock(); 1742 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1743 err = -ENODEV; 1744 if (!dp) 1745 goto exit_unlock_free; 1746 1747 if (port_no) { 1748 vport = ovs_vport_ovsl(dp, port_no); 1749 err = -EBUSY; 1750 if (vport) 1751 goto exit_unlock_free; 1752 } else { 1753 for (port_no = 1; ; port_no++) { 1754 if (port_no >= DP_MAX_PORTS) { 1755 err = -EFBIG; 1756 goto exit_unlock_free; 1757 } 1758 vport = ovs_vport_ovsl(dp, port_no); 1759 if (!vport) 1760 break; 1761 } 1762 } 1763 1764 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 1765 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 1766 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 1767 parms.dp = dp; 1768 parms.port_no = port_no; 1769 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 1770 1771 vport = new_vport(&parms); 1772 err = PTR_ERR(vport); 1773 if (IS_ERR(vport)) 1774 goto exit_unlock_free; 1775 1776 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 1777 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 1778 BUG_ON(err < 0); 1779 ovs_unlock(); 1780 1781 ovs_notify(&dp_vport_genl_family, reply, info); 1782 return 0; 1783 1784 exit_unlock_free: 1785 ovs_unlock(); 1786 kfree_skb(reply); 1787 return err; 1788 } 1789 1790 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 1791 { 1792 struct nlattr **a = info->attrs; 1793 struct sk_buff *reply; 1794 struct vport *vport; 1795 int err; 1796 1797 reply = ovs_vport_cmd_alloc_info(); 1798 if (!reply) 1799 return -ENOMEM; 1800 1801 ovs_lock(); 1802 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1803 err = PTR_ERR(vport); 1804 if (IS_ERR(vport)) 1805 goto exit_unlock_free; 1806 1807 if (a[OVS_VPORT_ATTR_TYPE] && 1808 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 1809 err = -EINVAL; 1810 goto exit_unlock_free; 1811 } 1812 1813 if (a[OVS_VPORT_ATTR_OPTIONS]) { 1814 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 1815 if (err) 1816 goto exit_unlock_free; 1817 } 1818 1819 1820 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 1821 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 1822 1823 err = ovs_vport_set_upcall_portids(vport, ids); 1824 if (err) 1825 goto exit_unlock_free; 1826 } 1827 1828 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 1829 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 1830 BUG_ON(err < 0); 1831 1832 ovs_unlock(); 1833 ovs_notify(&dp_vport_genl_family, reply, info); 1834 return 0; 1835 1836 exit_unlock_free: 1837 ovs_unlock(); 1838 kfree_skb(reply); 1839 return err; 1840 } 1841 1842 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 1843 { 1844 struct nlattr **a = info->attrs; 1845 struct sk_buff *reply; 1846 struct vport *vport; 1847 int err; 1848 1849 reply = ovs_vport_cmd_alloc_info(); 1850 if (!reply) 1851 return -ENOMEM; 1852 1853 ovs_lock(); 1854 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1855 err = PTR_ERR(vport); 1856 if (IS_ERR(vport)) 1857 goto exit_unlock_free; 1858 1859 if (vport->port_no == OVSP_LOCAL) { 1860 err = -EINVAL; 1861 goto exit_unlock_free; 1862 } 1863 1864 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 1865 info->snd_seq, 0, OVS_VPORT_CMD_DEL); 1866 BUG_ON(err < 0); 1867 ovs_dp_detach_port(vport); 1868 ovs_unlock(); 1869 1870 ovs_notify(&dp_vport_genl_family, reply, info); 1871 return 0; 1872 1873 exit_unlock_free: 1874 ovs_unlock(); 1875 kfree_skb(reply); 1876 return err; 1877 } 1878 1879 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 1880 { 1881 struct nlattr **a = info->attrs; 1882 struct ovs_header *ovs_header = info->userhdr; 1883 struct sk_buff *reply; 1884 struct vport *vport; 1885 int err; 1886 1887 reply = ovs_vport_cmd_alloc_info(); 1888 if (!reply) 1889 return -ENOMEM; 1890 1891 rcu_read_lock(); 1892 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 1893 err = PTR_ERR(vport); 1894 if (IS_ERR(vport)) 1895 goto exit_unlock_free; 1896 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 1897 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 1898 BUG_ON(err < 0); 1899 rcu_read_unlock(); 1900 1901 return genlmsg_reply(reply, info); 1902 1903 exit_unlock_free: 1904 rcu_read_unlock(); 1905 kfree_skb(reply); 1906 return err; 1907 } 1908 1909 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1910 { 1911 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1912 struct datapath *dp; 1913 int bucket = cb->args[0], skip = cb->args[1]; 1914 int i, j = 0; 1915 1916 rcu_read_lock(); 1917 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1918 if (!dp) { 1919 rcu_read_unlock(); 1920 return -ENODEV; 1921 } 1922 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 1923 struct vport *vport; 1924 1925 j = 0; 1926 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 1927 if (j >= skip && 1928 ovs_vport_cmd_fill_info(vport, skb, 1929 NETLINK_CB(cb->skb).portid, 1930 cb->nlh->nlmsg_seq, 1931 NLM_F_MULTI, 1932 OVS_VPORT_CMD_NEW) < 0) 1933 goto out; 1934 1935 j++; 1936 } 1937 skip = 0; 1938 } 1939 out: 1940 rcu_read_unlock(); 1941 1942 cb->args[0] = i; 1943 cb->args[1] = j; 1944 1945 return skb->len; 1946 } 1947 1948 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 1949 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1950 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 1951 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 1952 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 1953 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1954 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 1955 }; 1956 1957 static const struct genl_ops dp_vport_genl_ops[] = { 1958 { .cmd = OVS_VPORT_CMD_NEW, 1959 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1960 .policy = vport_policy, 1961 .doit = ovs_vport_cmd_new 1962 }, 1963 { .cmd = OVS_VPORT_CMD_DEL, 1964 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1965 .policy = vport_policy, 1966 .doit = ovs_vport_cmd_del 1967 }, 1968 { .cmd = OVS_VPORT_CMD_GET, 1969 .flags = 0, /* OK for unprivileged users. */ 1970 .policy = vport_policy, 1971 .doit = ovs_vport_cmd_get, 1972 .dumpit = ovs_vport_cmd_dump 1973 }, 1974 { .cmd = OVS_VPORT_CMD_SET, 1975 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1976 .policy = vport_policy, 1977 .doit = ovs_vport_cmd_set, 1978 }, 1979 }; 1980 1981 struct genl_family dp_vport_genl_family = { 1982 .id = GENL_ID_GENERATE, 1983 .hdrsize = sizeof(struct ovs_header), 1984 .name = OVS_VPORT_FAMILY, 1985 .version = OVS_VPORT_VERSION, 1986 .maxattr = OVS_VPORT_ATTR_MAX, 1987 .netnsok = true, 1988 .parallel_ops = true, 1989 .ops = dp_vport_genl_ops, 1990 .n_ops = ARRAY_SIZE(dp_vport_genl_ops), 1991 .mcgrps = &ovs_dp_vport_multicast_group, 1992 .n_mcgrps = 1, 1993 }; 1994 1995 static struct genl_family * const dp_genl_families[] = { 1996 &dp_datapath_genl_family, 1997 &dp_vport_genl_family, 1998 &dp_flow_genl_family, 1999 &dp_packet_genl_family, 2000 }; 2001 2002 static void dp_unregister_genl(int n_families) 2003 { 2004 int i; 2005 2006 for (i = 0; i < n_families; i++) 2007 genl_unregister_family(dp_genl_families[i]); 2008 } 2009 2010 static int dp_register_genl(void) 2011 { 2012 int err; 2013 int i; 2014 2015 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2016 2017 err = genl_register_family(dp_genl_families[i]); 2018 if (err) 2019 goto error; 2020 } 2021 2022 return 0; 2023 2024 error: 2025 dp_unregister_genl(i); 2026 return err; 2027 } 2028 2029 static int __net_init ovs_init_net(struct net *net) 2030 { 2031 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2032 2033 INIT_LIST_HEAD(&ovs_net->dps); 2034 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2035 return 0; 2036 } 2037 2038 static void __net_exit ovs_exit_net(struct net *net) 2039 { 2040 struct datapath *dp, *dp_next; 2041 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2042 2043 ovs_lock(); 2044 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2045 __dp_destroy(dp); 2046 ovs_unlock(); 2047 2048 cancel_work_sync(&ovs_net->dp_notify_work); 2049 } 2050 2051 static struct pernet_operations ovs_net_ops = { 2052 .init = ovs_init_net, 2053 .exit = ovs_exit_net, 2054 .id = &ovs_net_id, 2055 .size = sizeof(struct ovs_net), 2056 }; 2057 2058 static int __init dp_init(void) 2059 { 2060 int err; 2061 2062 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); 2063 2064 pr_info("Open vSwitch switching datapath\n"); 2065 2066 err = ovs_internal_dev_rtnl_link_register(); 2067 if (err) 2068 goto error; 2069 2070 err = ovs_flow_init(); 2071 if (err) 2072 goto error_unreg_rtnl_link; 2073 2074 err = ovs_vport_init(); 2075 if (err) 2076 goto error_flow_exit; 2077 2078 err = register_pernet_device(&ovs_net_ops); 2079 if (err) 2080 goto error_vport_exit; 2081 2082 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2083 if (err) 2084 goto error_netns_exit; 2085 2086 err = dp_register_genl(); 2087 if (err < 0) 2088 goto error_unreg_notifier; 2089 2090 return 0; 2091 2092 error_unreg_notifier: 2093 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2094 error_netns_exit: 2095 unregister_pernet_device(&ovs_net_ops); 2096 error_vport_exit: 2097 ovs_vport_exit(); 2098 error_flow_exit: 2099 ovs_flow_exit(); 2100 error_unreg_rtnl_link: 2101 ovs_internal_dev_rtnl_link_unregister(); 2102 error: 2103 return err; 2104 } 2105 2106 static void dp_cleanup(void) 2107 { 2108 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2109 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2110 unregister_pernet_device(&ovs_net_ops); 2111 rcu_barrier(); 2112 ovs_vport_exit(); 2113 ovs_flow_exit(); 2114 ovs_internal_dev_rtnl_link_unregister(); 2115 } 2116 2117 module_init(dp_init); 2118 module_exit(dp_cleanup); 2119 2120 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2121 MODULE_LICENSE("GPL"); 2122