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 <net/genetlink.h> 51 #include <net/net_namespace.h> 52 #include <net/netns/generic.h> 53 54 #include "datapath.h" 55 #include "flow.h" 56 #include "flow_table.h" 57 #include "flow_netlink.h" 58 #include "vport-internal_dev.h" 59 #include "vport-netdev.h" 60 61 int ovs_net_id __read_mostly; 62 EXPORT_SYMBOL_GPL(ovs_net_id); 63 64 static struct genl_family dp_packet_genl_family; 65 static struct genl_family dp_flow_genl_family; 66 static struct genl_family dp_datapath_genl_family; 67 68 static const struct genl_multicast_group ovs_dp_flow_multicast_group = { 69 .name = OVS_FLOW_MCGROUP, 70 }; 71 72 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = { 73 .name = OVS_DATAPATH_MCGROUP, 74 }; 75 76 static const struct genl_multicast_group ovs_dp_vport_multicast_group = { 77 .name = OVS_VPORT_MCGROUP, 78 }; 79 80 /* Check if need to build a reply message. 81 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */ 82 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info, 83 unsigned int group) 84 { 85 return info->nlhdr->nlmsg_flags & NLM_F_ECHO || 86 genl_has_listeners(family, genl_info_net(info), group); 87 } 88 89 static void ovs_notify(struct genl_family *family, 90 struct sk_buff *skb, struct genl_info *info) 91 { 92 genl_notify(family, skb, genl_info_net(info), info->snd_portid, 93 0, info->nlhdr, GFP_KERNEL); 94 } 95 96 /** 97 * DOC: Locking: 98 * 99 * All writes e.g. Writes to device state (add/remove datapath, port, set 100 * operations on vports, etc.), Writes to other state (flow table 101 * modifications, set miscellaneous datapath parameters, etc.) are protected 102 * by ovs_lock. 103 * 104 * Reads are protected by RCU. 105 * 106 * There are a few special cases (mostly stats) that have their own 107 * synchronization but they nest under all of above and don't interact with 108 * each other. 109 * 110 * The RTNL lock nests inside ovs_mutex. 111 */ 112 113 static DEFINE_MUTEX(ovs_mutex); 114 115 void ovs_lock(void) 116 { 117 mutex_lock(&ovs_mutex); 118 } 119 120 void ovs_unlock(void) 121 { 122 mutex_unlock(&ovs_mutex); 123 } 124 125 #ifdef CONFIG_LOCKDEP 126 int lockdep_ovsl_is_held(void) 127 { 128 if (debug_locks) 129 return lockdep_is_held(&ovs_mutex); 130 else 131 return 1; 132 } 133 EXPORT_SYMBOL_GPL(lockdep_ovsl_is_held); 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 sw_flow_key *, 139 const struct dp_upcall_info *); 140 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *, 141 const struct sw_flow_key *, 142 const struct dp_upcall_info *); 143 144 /* Must be called with rcu_read_lock. */ 145 static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex) 146 { 147 struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex); 148 149 if (dev) { 150 struct vport *vport = ovs_internal_dev_get_vport(dev); 151 if (vport) 152 return vport->dp; 153 } 154 155 return NULL; 156 } 157 158 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the 159 * returned dp pointer valid. 160 */ 161 static inline struct datapath *get_dp(struct net *net, int dp_ifindex) 162 { 163 struct datapath *dp; 164 165 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); 166 rcu_read_lock(); 167 dp = get_dp_rcu(net, dp_ifindex); 168 rcu_read_unlock(); 169 170 return dp; 171 } 172 173 /* Must be called with rcu_read_lock or ovs_mutex. */ 174 const char *ovs_dp_name(const struct datapath *dp) 175 { 176 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); 177 return vport->ops->get_name(vport); 178 } 179 180 static int get_dpifindex(const struct datapath *dp) 181 { 182 struct vport *local; 183 int ifindex; 184 185 rcu_read_lock(); 186 187 local = ovs_vport_rcu(dp, OVSP_LOCAL); 188 if (local) 189 ifindex = netdev_vport_priv(local)->dev->ifindex; 190 else 191 ifindex = 0; 192 193 rcu_read_unlock(); 194 195 return ifindex; 196 } 197 198 static void destroy_dp_rcu(struct rcu_head *rcu) 199 { 200 struct datapath *dp = container_of(rcu, struct datapath, rcu); 201 202 ovs_flow_tbl_destroy(&dp->table); 203 free_percpu(dp->stats_percpu); 204 release_net(ovs_dp_get_net(dp)); 205 kfree(dp->ports); 206 kfree(dp); 207 } 208 209 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 210 u16 port_no) 211 { 212 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 213 } 214 215 /* Called with ovs_mutex or RCU read lock. */ 216 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 217 { 218 struct vport *vport; 219 struct hlist_head *head; 220 221 head = vport_hash_bucket(dp, port_no); 222 hlist_for_each_entry_rcu(vport, head, dp_hash_node) { 223 if (vport->port_no == port_no) 224 return vport; 225 } 226 return NULL; 227 } 228 229 /* Called with ovs_mutex. */ 230 static struct vport *new_vport(const struct vport_parms *parms) 231 { 232 struct vport *vport; 233 234 vport = ovs_vport_add(parms); 235 if (!IS_ERR(vport)) { 236 struct datapath *dp = parms->dp; 237 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 238 239 hlist_add_head_rcu(&vport->dp_hash_node, head); 240 } 241 return vport; 242 } 243 244 void ovs_dp_detach_port(struct vport *p) 245 { 246 ASSERT_OVSL(); 247 248 /* First drop references to device. */ 249 hlist_del_rcu(&p->dp_hash_node); 250 251 /* Then destroy it. */ 252 ovs_vport_del(p); 253 } 254 255 /* Must be called with rcu_read_lock. */ 256 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key) 257 { 258 const struct vport *p = OVS_CB(skb)->input_vport; 259 struct datapath *dp = p->dp; 260 struct sw_flow *flow; 261 struct sw_flow_actions *sf_acts; 262 struct dp_stats_percpu *stats; 263 u64 *stats_counter; 264 u32 n_mask_hit; 265 266 stats = this_cpu_ptr(dp->stats_percpu); 267 268 /* Look up flow. */ 269 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit); 270 if (unlikely(!flow)) { 271 struct dp_upcall_info upcall; 272 int error; 273 274 upcall.cmd = OVS_PACKET_CMD_MISS; 275 upcall.userdata = NULL; 276 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 277 upcall.egress_tun_info = NULL; 278 error = ovs_dp_upcall(dp, skb, key, &upcall); 279 if (unlikely(error)) 280 kfree_skb(skb); 281 else 282 consume_skb(skb); 283 stats_counter = &stats->n_missed; 284 goto out; 285 } 286 287 ovs_flow_stats_update(flow, key->tp.flags, skb); 288 sf_acts = rcu_dereference(flow->sf_acts); 289 ovs_execute_actions(dp, skb, sf_acts, key); 290 291 stats_counter = &stats->n_hit; 292 293 out: 294 /* Update datapath statistics. */ 295 u64_stats_update_begin(&stats->syncp); 296 (*stats_counter)++; 297 stats->n_mask_hit += n_mask_hit; 298 u64_stats_update_end(&stats->syncp); 299 } 300 301 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 302 const struct sw_flow_key *key, 303 const struct dp_upcall_info *upcall_info) 304 { 305 struct dp_stats_percpu *stats; 306 int err; 307 308 if (upcall_info->portid == 0) { 309 err = -ENOTCONN; 310 goto err; 311 } 312 313 if (!skb_is_gso(skb)) 314 err = queue_userspace_packet(dp, skb, key, upcall_info); 315 else 316 err = queue_gso_packets(dp, skb, key, upcall_info); 317 if (err) 318 goto err; 319 320 return 0; 321 322 err: 323 stats = this_cpu_ptr(dp->stats_percpu); 324 325 u64_stats_update_begin(&stats->syncp); 326 stats->n_lost++; 327 u64_stats_update_end(&stats->syncp); 328 329 return err; 330 } 331 332 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 333 const struct sw_flow_key *key, 334 const struct dp_upcall_info *upcall_info) 335 { 336 unsigned short gso_type = skb_shinfo(skb)->gso_type; 337 struct sw_flow_key later_key; 338 struct sk_buff *segs, *nskb; 339 struct ovs_skb_cb ovs_cb; 340 int err; 341 342 ovs_cb = *OVS_CB(skb); 343 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 344 *OVS_CB(skb) = ovs_cb; 345 if (IS_ERR(segs)) 346 return PTR_ERR(segs); 347 if (segs == NULL) 348 return -EINVAL; 349 350 if (gso_type & SKB_GSO_UDP) { 351 /* The initial flow key extracted by ovs_flow_key_extract() 352 * in this case is for a first fragment, so we need to 353 * properly mark later fragments. 354 */ 355 later_key = *key; 356 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 357 } 358 359 /* Queue all of the segments. */ 360 skb = segs; 361 do { 362 *OVS_CB(skb) = ovs_cb; 363 if (gso_type & SKB_GSO_UDP && skb != segs) 364 key = &later_key; 365 366 err = queue_userspace_packet(dp, skb, key, upcall_info); 367 if (err) 368 break; 369 370 } while ((skb = skb->next)); 371 372 /* Free all of the segments. */ 373 skb = segs; 374 do { 375 nskb = skb->next; 376 if (err) 377 kfree_skb(skb); 378 else 379 consume_skb(skb); 380 } while ((skb = nskb)); 381 return err; 382 } 383 384 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, 385 unsigned int hdrlen) 386 { 387 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 388 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 389 + nla_total_size(ovs_key_attr_size()); /* OVS_PACKET_ATTR_KEY */ 390 391 /* OVS_PACKET_ATTR_USERDATA */ 392 if (upcall_info->userdata) 393 size += NLA_ALIGN(upcall_info->userdata->nla_len); 394 395 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ 396 if (upcall_info->egress_tun_info) 397 size += nla_total_size(ovs_tun_key_attr_size()); 398 399 return size; 400 } 401 402 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 403 const struct sw_flow_key *key, 404 const struct dp_upcall_info *upcall_info) 405 { 406 struct ovs_header *upcall; 407 struct sk_buff *nskb = NULL; 408 struct sk_buff *user_skb = NULL; /* to be queued to userspace */ 409 struct nlattr *nla; 410 struct genl_info info = { 411 .dst_sk = ovs_dp_get_net(dp)->genl_sock, 412 .snd_portid = upcall_info->portid, 413 }; 414 size_t len; 415 unsigned int hlen; 416 int err, dp_ifindex; 417 418 dp_ifindex = get_dpifindex(dp); 419 if (!dp_ifindex) 420 return -ENODEV; 421 422 if (vlan_tx_tag_present(skb)) { 423 nskb = skb_clone(skb, GFP_ATOMIC); 424 if (!nskb) 425 return -ENOMEM; 426 427 nskb = __vlan_hwaccel_push_inside(nskb); 428 if (!nskb) 429 return -ENOMEM; 430 431 skb = nskb; 432 } 433 434 if (nla_attr_size(skb->len) > USHRT_MAX) { 435 err = -EFBIG; 436 goto out; 437 } 438 439 /* Complete checksum if needed */ 440 if (skb->ip_summed == CHECKSUM_PARTIAL && 441 (err = skb_checksum_help(skb))) 442 goto out; 443 444 /* Older versions of OVS user space enforce alignment of the last 445 * Netlink attribute to NLA_ALIGNTO which would require extensive 446 * padding logic. Only perform zerocopy if padding is not required. 447 */ 448 if (dp->user_features & OVS_DP_F_UNALIGNED) 449 hlen = skb_zerocopy_headlen(skb); 450 else 451 hlen = skb->len; 452 453 len = upcall_msg_size(upcall_info, hlen); 454 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC); 455 if (!user_skb) { 456 err = -ENOMEM; 457 goto out; 458 } 459 460 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 461 0, upcall_info->cmd); 462 upcall->dp_ifindex = dp_ifindex; 463 464 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY); 465 err = ovs_nla_put_flow(key, key, user_skb); 466 BUG_ON(err); 467 nla_nest_end(user_skb, nla); 468 469 if (upcall_info->userdata) 470 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 471 nla_len(upcall_info->userdata), 472 nla_data(upcall_info->userdata)); 473 474 if (upcall_info->egress_tun_info) { 475 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY); 476 err = ovs_nla_put_egress_tunnel_key(user_skb, 477 upcall_info->egress_tun_info); 478 BUG_ON(err); 479 nla_nest_end(user_skb, nla); 480 } 481 482 /* Only reserve room for attribute header, packet data is added 483 * in skb_zerocopy() */ 484 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 485 err = -ENOBUFS; 486 goto out; 487 } 488 nla->nla_len = nla_attr_size(skb->len); 489 490 err = skb_zerocopy(user_skb, skb, skb->len, hlen); 491 if (err) 492 goto out; 493 494 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 495 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 496 size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len; 497 498 if (plen > 0) 499 memset(skb_put(user_skb, plen), 0, plen); 500 } 501 502 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 503 504 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 505 user_skb = NULL; 506 out: 507 if (err) 508 skb_tx_error(skb); 509 kfree_skb(user_skb); 510 kfree_skb(nskb); 511 return err; 512 } 513 514 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 515 { 516 struct ovs_header *ovs_header = info->userhdr; 517 struct nlattr **a = info->attrs; 518 struct sw_flow_actions *acts; 519 struct sk_buff *packet; 520 struct sw_flow *flow; 521 struct sw_flow_actions *sf_acts; 522 struct datapath *dp; 523 struct ethhdr *eth; 524 struct vport *input_vport; 525 int len; 526 int err; 527 bool log = !a[OVS_PACKET_ATTR_PROBE]; 528 529 err = -EINVAL; 530 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 531 !a[OVS_PACKET_ATTR_ACTIONS]) 532 goto err; 533 534 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 535 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 536 err = -ENOMEM; 537 if (!packet) 538 goto err; 539 skb_reserve(packet, NET_IP_ALIGN); 540 541 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 542 543 skb_reset_mac_header(packet); 544 eth = eth_hdr(packet); 545 546 /* Normally, setting the skb 'protocol' field would be handled by a 547 * call to eth_type_trans(), but it assumes there's a sending 548 * device, which we may not have. */ 549 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) 550 packet->protocol = eth->h_proto; 551 else 552 packet->protocol = htons(ETH_P_802_2); 553 554 /* Build an sw_flow for sending this packet. */ 555 flow = ovs_flow_alloc(); 556 err = PTR_ERR(flow); 557 if (IS_ERR(flow)) 558 goto err_kfree_skb; 559 560 err = ovs_flow_key_extract_userspace(a[OVS_PACKET_ATTR_KEY], packet, 561 &flow->key, log); 562 if (err) 563 goto err_flow_free; 564 565 err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS], 566 &flow->key, &acts, log); 567 if (err) 568 goto err_flow_free; 569 570 rcu_assign_pointer(flow->sf_acts, acts); 571 OVS_CB(packet)->egress_tun_info = NULL; 572 packet->priority = flow->key.phy.priority; 573 packet->mark = flow->key.phy.skb_mark; 574 575 rcu_read_lock(); 576 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 577 err = -ENODEV; 578 if (!dp) 579 goto err_unlock; 580 581 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 582 if (!input_vport) 583 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 584 585 if (!input_vport) 586 goto err_unlock; 587 588 OVS_CB(packet)->input_vport = input_vport; 589 sf_acts = rcu_dereference(flow->sf_acts); 590 591 local_bh_disable(); 592 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); 593 local_bh_enable(); 594 rcu_read_unlock(); 595 596 ovs_flow_free(flow, false); 597 return err; 598 599 err_unlock: 600 rcu_read_unlock(); 601 err_flow_free: 602 ovs_flow_free(flow, false); 603 err_kfree_skb: 604 kfree_skb(packet); 605 err: 606 return err; 607 } 608 609 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 610 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 611 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 612 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 613 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, 614 }; 615 616 static const struct genl_ops dp_packet_genl_ops[] = { 617 { .cmd = OVS_PACKET_CMD_EXECUTE, 618 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 619 .policy = packet_policy, 620 .doit = ovs_packet_cmd_execute 621 } 622 }; 623 624 static struct genl_family dp_packet_genl_family = { 625 .id = GENL_ID_GENERATE, 626 .hdrsize = sizeof(struct ovs_header), 627 .name = OVS_PACKET_FAMILY, 628 .version = OVS_PACKET_VERSION, 629 .maxattr = OVS_PACKET_ATTR_MAX, 630 .netnsok = true, 631 .parallel_ops = true, 632 .ops = dp_packet_genl_ops, 633 .n_ops = ARRAY_SIZE(dp_packet_genl_ops), 634 }; 635 636 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 637 struct ovs_dp_megaflow_stats *mega_stats) 638 { 639 int i; 640 641 memset(mega_stats, 0, sizeof(*mega_stats)); 642 643 stats->n_flows = ovs_flow_tbl_count(&dp->table); 644 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 645 646 stats->n_hit = stats->n_missed = stats->n_lost = 0; 647 648 for_each_possible_cpu(i) { 649 const struct dp_stats_percpu *percpu_stats; 650 struct dp_stats_percpu local_stats; 651 unsigned int start; 652 653 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 654 655 do { 656 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 657 local_stats = *percpu_stats; 658 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 659 660 stats->n_hit += local_stats.n_hit; 661 stats->n_missed += local_stats.n_missed; 662 stats->n_lost += local_stats.n_lost; 663 mega_stats->n_mask_hit += local_stats.n_mask_hit; 664 } 665 } 666 667 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts) 668 { 669 return NLMSG_ALIGN(sizeof(struct ovs_header)) 670 + nla_total_size(ovs_key_attr_size()) /* OVS_FLOW_ATTR_KEY */ 671 + nla_total_size(ovs_key_attr_size()) /* OVS_FLOW_ATTR_MASK */ 672 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 673 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 674 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */ 675 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */ 676 } 677 678 /* Called with ovs_mutex or RCU read lock. */ 679 static int ovs_flow_cmd_fill_match(const struct sw_flow *flow, 680 struct sk_buff *skb) 681 { 682 struct nlattr *nla; 683 int err; 684 685 /* Fill flow key. */ 686 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY); 687 if (!nla) 688 return -EMSGSIZE; 689 690 err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb); 691 if (err) 692 return err; 693 694 nla_nest_end(skb, nla); 695 696 /* Fill flow mask. */ 697 nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK); 698 if (!nla) 699 return -EMSGSIZE; 700 701 err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb); 702 if (err) 703 return err; 704 705 nla_nest_end(skb, nla); 706 return 0; 707 } 708 709 /* Called with ovs_mutex or RCU read lock. */ 710 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 711 struct sk_buff *skb) 712 { 713 struct ovs_flow_stats stats; 714 __be16 tcp_flags; 715 unsigned long used; 716 717 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 718 719 if (used && 720 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used))) 721 return -EMSGSIZE; 722 723 if (stats.n_packets && 724 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats)) 725 return -EMSGSIZE; 726 727 if ((u8)ntohs(tcp_flags) && 728 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 729 return -EMSGSIZE; 730 731 return 0; 732 } 733 734 /* Called with ovs_mutex or RCU read lock. */ 735 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 736 struct sk_buff *skb, int skb_orig_len) 737 { 738 struct nlattr *start; 739 int err; 740 741 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 742 * this is the first flow to be dumped into 'skb'. This is unusual for 743 * Netlink but individual action lists can be longer than 744 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 745 * The userspace caller can always fetch the actions separately if it 746 * really wants them. (Most userspace callers in fact don't care.) 747 * 748 * This can only fail for dump operations because the skb is always 749 * properly sized for single flows. 750 */ 751 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS); 752 if (start) { 753 const struct sw_flow_actions *sf_acts; 754 755 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 756 err = ovs_nla_put_actions(sf_acts->actions, 757 sf_acts->actions_len, skb); 758 759 if (!err) 760 nla_nest_end(skb, start); 761 else { 762 if (skb_orig_len) 763 return err; 764 765 nla_nest_cancel(skb, start); 766 } 767 } else if (skb_orig_len) { 768 return -EMSGSIZE; 769 } 770 771 return 0; 772 } 773 774 /* Called with ovs_mutex or RCU read lock. */ 775 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 776 struct sk_buff *skb, u32 portid, 777 u32 seq, u32 flags, u8 cmd) 778 { 779 const int skb_orig_len = skb->len; 780 struct ovs_header *ovs_header; 781 int err; 782 783 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 784 flags, cmd); 785 if (!ovs_header) 786 return -EMSGSIZE; 787 788 ovs_header->dp_ifindex = dp_ifindex; 789 790 err = ovs_flow_cmd_fill_match(flow, skb); 791 if (err) 792 goto error; 793 794 err = ovs_flow_cmd_fill_stats(flow, skb); 795 if (err) 796 goto error; 797 798 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 799 if (err) 800 goto error; 801 802 return genlmsg_end(skb, ovs_header); 803 804 error: 805 genlmsg_cancel(skb, ovs_header); 806 return err; 807 } 808 809 /* May not be called with RCU read lock. */ 810 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 811 struct genl_info *info, 812 bool always) 813 { 814 struct sk_buff *skb; 815 816 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 817 return NULL; 818 819 skb = genlmsg_new_unicast(ovs_flow_cmd_msg_size(acts), info, GFP_KERNEL); 820 if (!skb) 821 return ERR_PTR(-ENOMEM); 822 823 return skb; 824 } 825 826 /* Called with ovs_mutex. */ 827 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 828 int dp_ifindex, 829 struct genl_info *info, u8 cmd, 830 bool always) 831 { 832 struct sk_buff *skb; 833 int retval; 834 835 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), info, 836 always); 837 if (IS_ERR_OR_NULL(skb)) 838 return skb; 839 840 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 841 info->snd_portid, info->snd_seq, 0, 842 cmd); 843 BUG_ON(retval < 0); 844 return skb; 845 } 846 847 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 848 { 849 struct nlattr **a = info->attrs; 850 struct ovs_header *ovs_header = info->userhdr; 851 struct sw_flow *flow, *new_flow; 852 struct sw_flow_mask mask; 853 struct sk_buff *reply; 854 struct datapath *dp; 855 struct sw_flow_actions *acts; 856 struct sw_flow_match match; 857 int error; 858 bool log = !a[OVS_FLOW_ATTR_PROBE]; 859 860 /* Must have key and actions. */ 861 error = -EINVAL; 862 if (!a[OVS_FLOW_ATTR_KEY]) { 863 OVS_NLERR(log, "Flow key attr not present in new flow."); 864 goto error; 865 } 866 if (!a[OVS_FLOW_ATTR_ACTIONS]) { 867 OVS_NLERR(log, "Flow actions attr not present in new flow."); 868 goto error; 869 } 870 871 /* Most of the time we need to allocate a new flow, do it before 872 * locking. 873 */ 874 new_flow = ovs_flow_alloc(); 875 if (IS_ERR(new_flow)) { 876 error = PTR_ERR(new_flow); 877 goto error; 878 } 879 880 /* Extract key. */ 881 ovs_match_init(&match, &new_flow->unmasked_key, &mask); 882 error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], 883 a[OVS_FLOW_ATTR_MASK], log); 884 if (error) 885 goto err_kfree_flow; 886 887 ovs_flow_mask_key(&new_flow->key, &new_flow->unmasked_key, &mask); 888 889 /* Validate actions. */ 890 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &new_flow->key, 891 &acts, log); 892 if (error) { 893 OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); 894 goto err_kfree_flow; 895 } 896 897 reply = ovs_flow_cmd_alloc_info(acts, info, false); 898 if (IS_ERR(reply)) { 899 error = PTR_ERR(reply); 900 goto err_kfree_acts; 901 } 902 903 ovs_lock(); 904 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 905 if (unlikely(!dp)) { 906 error = -ENODEV; 907 goto err_unlock_ovs; 908 } 909 /* Check if this is a duplicate flow */ 910 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->unmasked_key); 911 if (likely(!flow)) { 912 rcu_assign_pointer(new_flow->sf_acts, acts); 913 914 /* Put flow in bucket. */ 915 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 916 if (unlikely(error)) { 917 acts = NULL; 918 goto err_unlock_ovs; 919 } 920 921 if (unlikely(reply)) { 922 error = ovs_flow_cmd_fill_info(new_flow, 923 ovs_header->dp_ifindex, 924 reply, info->snd_portid, 925 info->snd_seq, 0, 926 OVS_FLOW_CMD_NEW); 927 BUG_ON(error < 0); 928 } 929 ovs_unlock(); 930 } else { 931 struct sw_flow_actions *old_acts; 932 933 /* Bail out if we're not allowed to modify an existing flow. 934 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 935 * because Generic Netlink treats the latter as a dump 936 * request. We also accept NLM_F_EXCL in case that bug ever 937 * gets fixed. 938 */ 939 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 940 | NLM_F_EXCL))) { 941 error = -EEXIST; 942 goto err_unlock_ovs; 943 } 944 /* The unmasked key has to be the same for flow updates. */ 945 if (unlikely(!ovs_flow_cmp_unmasked_key(flow, &match))) { 946 /* Look for any overlapping flow. */ 947 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 948 if (!flow) { 949 error = -ENOENT; 950 goto err_unlock_ovs; 951 } 952 } 953 /* Update actions. */ 954 old_acts = ovsl_dereference(flow->sf_acts); 955 rcu_assign_pointer(flow->sf_acts, acts); 956 957 if (unlikely(reply)) { 958 error = ovs_flow_cmd_fill_info(flow, 959 ovs_header->dp_ifindex, 960 reply, info->snd_portid, 961 info->snd_seq, 0, 962 OVS_FLOW_CMD_NEW); 963 BUG_ON(error < 0); 964 } 965 ovs_unlock(); 966 967 ovs_nla_free_flow_actions(old_acts); 968 ovs_flow_free(new_flow, false); 969 } 970 971 if (reply) 972 ovs_notify(&dp_flow_genl_family, reply, info); 973 return 0; 974 975 err_unlock_ovs: 976 ovs_unlock(); 977 kfree_skb(reply); 978 err_kfree_acts: 979 kfree(acts); 980 err_kfree_flow: 981 ovs_flow_free(new_flow, false); 982 error: 983 return error; 984 } 985 986 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ 987 static struct sw_flow_actions *get_flow_actions(const struct nlattr *a, 988 const struct sw_flow_key *key, 989 const struct sw_flow_mask *mask, 990 bool log) 991 { 992 struct sw_flow_actions *acts; 993 struct sw_flow_key masked_key; 994 int error; 995 996 ovs_flow_mask_key(&masked_key, key, mask); 997 error = ovs_nla_copy_actions(a, &masked_key, &acts, log); 998 if (error) { 999 OVS_NLERR(log, 1000 "Actions may not be safe on all matching packets"); 1001 return ERR_PTR(error); 1002 } 1003 1004 return acts; 1005 } 1006 1007 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 1008 { 1009 struct nlattr **a = info->attrs; 1010 struct ovs_header *ovs_header = info->userhdr; 1011 struct sw_flow_key key; 1012 struct sw_flow *flow; 1013 struct sw_flow_mask mask; 1014 struct sk_buff *reply = NULL; 1015 struct datapath *dp; 1016 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 1017 struct sw_flow_match match; 1018 int error; 1019 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1020 1021 /* Extract key. */ 1022 error = -EINVAL; 1023 if (!a[OVS_FLOW_ATTR_KEY]) { 1024 OVS_NLERR(log, "Flow key attribute not present in set flow."); 1025 goto error; 1026 } 1027 1028 ovs_match_init(&match, &key, &mask); 1029 error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], 1030 a[OVS_FLOW_ATTR_MASK], log); 1031 if (error) 1032 goto error; 1033 1034 /* Validate actions. */ 1035 if (a[OVS_FLOW_ATTR_ACTIONS]) { 1036 acts = get_flow_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, &mask, 1037 log); 1038 if (IS_ERR(acts)) { 1039 error = PTR_ERR(acts); 1040 goto error; 1041 } 1042 1043 /* Can allocate before locking if have acts. */ 1044 reply = ovs_flow_cmd_alloc_info(acts, info, false); 1045 if (IS_ERR(reply)) { 1046 error = PTR_ERR(reply); 1047 goto err_kfree_acts; 1048 } 1049 } 1050 1051 ovs_lock(); 1052 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1053 if (unlikely(!dp)) { 1054 error = -ENODEV; 1055 goto err_unlock_ovs; 1056 } 1057 /* Check that the flow exists. */ 1058 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1059 if (unlikely(!flow)) { 1060 error = -ENOENT; 1061 goto err_unlock_ovs; 1062 } 1063 1064 /* Update actions, if present. */ 1065 if (likely(acts)) { 1066 old_acts = ovsl_dereference(flow->sf_acts); 1067 rcu_assign_pointer(flow->sf_acts, acts); 1068 1069 if (unlikely(reply)) { 1070 error = ovs_flow_cmd_fill_info(flow, 1071 ovs_header->dp_ifindex, 1072 reply, info->snd_portid, 1073 info->snd_seq, 0, 1074 OVS_FLOW_CMD_NEW); 1075 BUG_ON(error < 0); 1076 } 1077 } else { 1078 /* Could not alloc without acts before locking. */ 1079 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1080 info, OVS_FLOW_CMD_NEW, false); 1081 if (unlikely(IS_ERR(reply))) { 1082 error = PTR_ERR(reply); 1083 goto err_unlock_ovs; 1084 } 1085 } 1086 1087 /* Clear stats. */ 1088 if (a[OVS_FLOW_ATTR_CLEAR]) 1089 ovs_flow_stats_clear(flow); 1090 ovs_unlock(); 1091 1092 if (reply) 1093 ovs_notify(&dp_flow_genl_family, reply, info); 1094 if (old_acts) 1095 ovs_nla_free_flow_actions(old_acts); 1096 1097 return 0; 1098 1099 err_unlock_ovs: 1100 ovs_unlock(); 1101 kfree_skb(reply); 1102 err_kfree_acts: 1103 kfree(acts); 1104 error: 1105 return error; 1106 } 1107 1108 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1109 { 1110 struct nlattr **a = info->attrs; 1111 struct ovs_header *ovs_header = info->userhdr; 1112 struct sw_flow_key key; 1113 struct sk_buff *reply; 1114 struct sw_flow *flow; 1115 struct datapath *dp; 1116 struct sw_flow_match match; 1117 int err; 1118 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1119 1120 if (!a[OVS_FLOW_ATTR_KEY]) { 1121 OVS_NLERR(log, 1122 "Flow get message rejected, Key attribute missing."); 1123 return -EINVAL; 1124 } 1125 1126 ovs_match_init(&match, &key, NULL); 1127 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL, log); 1128 if (err) 1129 return err; 1130 1131 ovs_lock(); 1132 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1133 if (!dp) { 1134 err = -ENODEV; 1135 goto unlock; 1136 } 1137 1138 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1139 if (!flow) { 1140 err = -ENOENT; 1141 goto unlock; 1142 } 1143 1144 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1145 OVS_FLOW_CMD_NEW, true); 1146 if (IS_ERR(reply)) { 1147 err = PTR_ERR(reply); 1148 goto unlock; 1149 } 1150 1151 ovs_unlock(); 1152 return genlmsg_reply(reply, info); 1153 unlock: 1154 ovs_unlock(); 1155 return err; 1156 } 1157 1158 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1159 { 1160 struct nlattr **a = info->attrs; 1161 struct ovs_header *ovs_header = info->userhdr; 1162 struct sw_flow_key key; 1163 struct sk_buff *reply; 1164 struct sw_flow *flow; 1165 struct datapath *dp; 1166 struct sw_flow_match match; 1167 int err; 1168 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1169 1170 if (likely(a[OVS_FLOW_ATTR_KEY])) { 1171 ovs_match_init(&match, &key, NULL); 1172 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL, 1173 log); 1174 if (unlikely(err)) 1175 return err; 1176 } 1177 1178 ovs_lock(); 1179 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1180 if (unlikely(!dp)) { 1181 err = -ENODEV; 1182 goto unlock; 1183 } 1184 1185 if (unlikely(!a[OVS_FLOW_ATTR_KEY])) { 1186 err = ovs_flow_tbl_flush(&dp->table); 1187 goto unlock; 1188 } 1189 1190 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1191 if (unlikely(!flow)) { 1192 err = -ENOENT; 1193 goto unlock; 1194 } 1195 1196 ovs_flow_tbl_remove(&dp->table, flow); 1197 ovs_unlock(); 1198 1199 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1200 info, false); 1201 if (likely(reply)) { 1202 if (likely(!IS_ERR(reply))) { 1203 rcu_read_lock(); /*To keep RCU checker happy. */ 1204 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1205 reply, info->snd_portid, 1206 info->snd_seq, 0, 1207 OVS_FLOW_CMD_DEL); 1208 rcu_read_unlock(); 1209 BUG_ON(err < 0); 1210 1211 ovs_notify(&dp_flow_genl_family, reply, info); 1212 } else { 1213 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply)); 1214 } 1215 } 1216 1217 ovs_flow_free(flow, true); 1218 return 0; 1219 unlock: 1220 ovs_unlock(); 1221 return err; 1222 } 1223 1224 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1225 { 1226 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1227 struct table_instance *ti; 1228 struct datapath *dp; 1229 1230 rcu_read_lock(); 1231 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1232 if (!dp) { 1233 rcu_read_unlock(); 1234 return -ENODEV; 1235 } 1236 1237 ti = rcu_dereference(dp->table.ti); 1238 for (;;) { 1239 struct sw_flow *flow; 1240 u32 bucket, obj; 1241 1242 bucket = cb->args[0]; 1243 obj = cb->args[1]; 1244 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1245 if (!flow) 1246 break; 1247 1248 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1249 NETLINK_CB(cb->skb).portid, 1250 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1251 OVS_FLOW_CMD_NEW) < 0) 1252 break; 1253 1254 cb->args[0] = bucket; 1255 cb->args[1] = obj; 1256 } 1257 rcu_read_unlock(); 1258 return skb->len; 1259 } 1260 1261 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1262 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1263 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1264 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1265 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1266 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1267 }; 1268 1269 static const struct genl_ops dp_flow_genl_ops[] = { 1270 { .cmd = OVS_FLOW_CMD_NEW, 1271 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1272 .policy = flow_policy, 1273 .doit = ovs_flow_cmd_new 1274 }, 1275 { .cmd = OVS_FLOW_CMD_DEL, 1276 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1277 .policy = flow_policy, 1278 .doit = ovs_flow_cmd_del 1279 }, 1280 { .cmd = OVS_FLOW_CMD_GET, 1281 .flags = 0, /* OK for unprivileged users. */ 1282 .policy = flow_policy, 1283 .doit = ovs_flow_cmd_get, 1284 .dumpit = ovs_flow_cmd_dump 1285 }, 1286 { .cmd = OVS_FLOW_CMD_SET, 1287 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1288 .policy = flow_policy, 1289 .doit = ovs_flow_cmd_set, 1290 }, 1291 }; 1292 1293 static struct genl_family dp_flow_genl_family = { 1294 .id = GENL_ID_GENERATE, 1295 .hdrsize = sizeof(struct ovs_header), 1296 .name = OVS_FLOW_FAMILY, 1297 .version = OVS_FLOW_VERSION, 1298 .maxattr = OVS_FLOW_ATTR_MAX, 1299 .netnsok = true, 1300 .parallel_ops = true, 1301 .ops = dp_flow_genl_ops, 1302 .n_ops = ARRAY_SIZE(dp_flow_genl_ops), 1303 .mcgrps = &ovs_dp_flow_multicast_group, 1304 .n_mcgrps = 1, 1305 }; 1306 1307 static size_t ovs_dp_cmd_msg_size(void) 1308 { 1309 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1310 1311 msgsize += nla_total_size(IFNAMSIZ); 1312 msgsize += nla_total_size(sizeof(struct ovs_dp_stats)); 1313 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats)); 1314 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1315 1316 return msgsize; 1317 } 1318 1319 /* Called with ovs_mutex. */ 1320 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1321 u32 portid, u32 seq, u32 flags, u8 cmd) 1322 { 1323 struct ovs_header *ovs_header; 1324 struct ovs_dp_stats dp_stats; 1325 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1326 int err; 1327 1328 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1329 flags, cmd); 1330 if (!ovs_header) 1331 goto error; 1332 1333 ovs_header->dp_ifindex = get_dpifindex(dp); 1334 1335 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1336 if (err) 1337 goto nla_put_failure; 1338 1339 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1340 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1341 &dp_stats)) 1342 goto nla_put_failure; 1343 1344 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1345 sizeof(struct ovs_dp_megaflow_stats), 1346 &dp_megaflow_stats)) 1347 goto nla_put_failure; 1348 1349 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1350 goto nla_put_failure; 1351 1352 return genlmsg_end(skb, ovs_header); 1353 1354 nla_put_failure: 1355 genlmsg_cancel(skb, ovs_header); 1356 error: 1357 return -EMSGSIZE; 1358 } 1359 1360 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info) 1361 { 1362 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL); 1363 } 1364 1365 /* Called with rcu_read_lock or ovs_mutex. */ 1366 static struct datapath *lookup_datapath(struct net *net, 1367 const struct ovs_header *ovs_header, 1368 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1369 { 1370 struct datapath *dp; 1371 1372 if (!a[OVS_DP_ATTR_NAME]) 1373 dp = get_dp(net, ovs_header->dp_ifindex); 1374 else { 1375 struct vport *vport; 1376 1377 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1378 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1379 } 1380 return dp ? dp : ERR_PTR(-ENODEV); 1381 } 1382 1383 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info) 1384 { 1385 struct datapath *dp; 1386 1387 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1388 if (IS_ERR(dp)) 1389 return; 1390 1391 WARN(dp->user_features, "Dropping previously announced user features\n"); 1392 dp->user_features = 0; 1393 } 1394 1395 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1396 { 1397 if (a[OVS_DP_ATTR_USER_FEATURES]) 1398 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1399 } 1400 1401 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1402 { 1403 struct nlattr **a = info->attrs; 1404 struct vport_parms parms; 1405 struct sk_buff *reply; 1406 struct datapath *dp; 1407 struct vport *vport; 1408 struct ovs_net *ovs_net; 1409 int err, i; 1410 1411 err = -EINVAL; 1412 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1413 goto err; 1414 1415 reply = ovs_dp_cmd_alloc_info(info); 1416 if (!reply) 1417 return -ENOMEM; 1418 1419 err = -ENOMEM; 1420 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1421 if (dp == NULL) 1422 goto err_free_reply; 1423 1424 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk))); 1425 1426 /* Allocate table. */ 1427 err = ovs_flow_tbl_init(&dp->table); 1428 if (err) 1429 goto err_free_dp; 1430 1431 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1432 if (!dp->stats_percpu) { 1433 err = -ENOMEM; 1434 goto err_destroy_table; 1435 } 1436 1437 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head), 1438 GFP_KERNEL); 1439 if (!dp->ports) { 1440 err = -ENOMEM; 1441 goto err_destroy_percpu; 1442 } 1443 1444 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1445 INIT_HLIST_HEAD(&dp->ports[i]); 1446 1447 /* Set up our datapath device. */ 1448 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1449 parms.type = OVS_VPORT_TYPE_INTERNAL; 1450 parms.options = NULL; 1451 parms.dp = dp; 1452 parms.port_no = OVSP_LOCAL; 1453 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1454 1455 ovs_dp_change(dp, a); 1456 1457 /* So far only local changes have been made, now need the lock. */ 1458 ovs_lock(); 1459 1460 vport = new_vport(&parms); 1461 if (IS_ERR(vport)) { 1462 err = PTR_ERR(vport); 1463 if (err == -EBUSY) 1464 err = -EEXIST; 1465 1466 if (err == -EEXIST) { 1467 /* An outdated user space instance that does not understand 1468 * the concept of user_features has attempted to create a new 1469 * datapath and is likely to reuse it. Drop all user features. 1470 */ 1471 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1472 ovs_dp_reset_user_features(skb, info); 1473 } 1474 1475 goto err_destroy_ports_array; 1476 } 1477 1478 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1479 info->snd_seq, 0, OVS_DP_CMD_NEW); 1480 BUG_ON(err < 0); 1481 1482 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1483 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1484 1485 ovs_unlock(); 1486 1487 ovs_notify(&dp_datapath_genl_family, reply, info); 1488 return 0; 1489 1490 err_destroy_ports_array: 1491 ovs_unlock(); 1492 kfree(dp->ports); 1493 err_destroy_percpu: 1494 free_percpu(dp->stats_percpu); 1495 err_destroy_table: 1496 ovs_flow_tbl_destroy(&dp->table); 1497 err_free_dp: 1498 release_net(ovs_dp_get_net(dp)); 1499 kfree(dp); 1500 err_free_reply: 1501 kfree_skb(reply); 1502 err: 1503 return err; 1504 } 1505 1506 /* Called with ovs_mutex. */ 1507 static void __dp_destroy(struct datapath *dp) 1508 { 1509 int i; 1510 1511 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1512 struct vport *vport; 1513 struct hlist_node *n; 1514 1515 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1516 if (vport->port_no != OVSP_LOCAL) 1517 ovs_dp_detach_port(vport); 1518 } 1519 1520 list_del_rcu(&dp->list_node); 1521 1522 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1523 * all ports in datapath are destroyed first before freeing datapath. 1524 */ 1525 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1526 1527 /* RCU destroy the flow table */ 1528 call_rcu(&dp->rcu, destroy_dp_rcu); 1529 } 1530 1531 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1532 { 1533 struct sk_buff *reply; 1534 struct datapath *dp; 1535 int err; 1536 1537 reply = ovs_dp_cmd_alloc_info(info); 1538 if (!reply) 1539 return -ENOMEM; 1540 1541 ovs_lock(); 1542 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1543 err = PTR_ERR(dp); 1544 if (IS_ERR(dp)) 1545 goto err_unlock_free; 1546 1547 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1548 info->snd_seq, 0, OVS_DP_CMD_DEL); 1549 BUG_ON(err < 0); 1550 1551 __dp_destroy(dp); 1552 ovs_unlock(); 1553 1554 ovs_notify(&dp_datapath_genl_family, reply, info); 1555 1556 return 0; 1557 1558 err_unlock_free: 1559 ovs_unlock(); 1560 kfree_skb(reply); 1561 return err; 1562 } 1563 1564 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1565 { 1566 struct sk_buff *reply; 1567 struct datapath *dp; 1568 int err; 1569 1570 reply = ovs_dp_cmd_alloc_info(info); 1571 if (!reply) 1572 return -ENOMEM; 1573 1574 ovs_lock(); 1575 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1576 err = PTR_ERR(dp); 1577 if (IS_ERR(dp)) 1578 goto err_unlock_free; 1579 1580 ovs_dp_change(dp, info->attrs); 1581 1582 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1583 info->snd_seq, 0, OVS_DP_CMD_NEW); 1584 BUG_ON(err < 0); 1585 1586 ovs_unlock(); 1587 ovs_notify(&dp_datapath_genl_family, reply, info); 1588 1589 return 0; 1590 1591 err_unlock_free: 1592 ovs_unlock(); 1593 kfree_skb(reply); 1594 return err; 1595 } 1596 1597 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1598 { 1599 struct sk_buff *reply; 1600 struct datapath *dp; 1601 int err; 1602 1603 reply = ovs_dp_cmd_alloc_info(info); 1604 if (!reply) 1605 return -ENOMEM; 1606 1607 ovs_lock(); 1608 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1609 if (IS_ERR(dp)) { 1610 err = PTR_ERR(dp); 1611 goto err_unlock_free; 1612 } 1613 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1614 info->snd_seq, 0, OVS_DP_CMD_NEW); 1615 BUG_ON(err < 0); 1616 ovs_unlock(); 1617 1618 return genlmsg_reply(reply, info); 1619 1620 err_unlock_free: 1621 ovs_unlock(); 1622 kfree_skb(reply); 1623 return err; 1624 } 1625 1626 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1627 { 1628 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1629 struct datapath *dp; 1630 int skip = cb->args[0]; 1631 int i = 0; 1632 1633 ovs_lock(); 1634 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1635 if (i >= skip && 1636 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1637 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1638 OVS_DP_CMD_NEW) < 0) 1639 break; 1640 i++; 1641 } 1642 ovs_unlock(); 1643 1644 cb->args[0] = i; 1645 1646 return skb->len; 1647 } 1648 1649 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1650 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1651 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1652 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1653 }; 1654 1655 static const struct genl_ops dp_datapath_genl_ops[] = { 1656 { .cmd = OVS_DP_CMD_NEW, 1657 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1658 .policy = datapath_policy, 1659 .doit = ovs_dp_cmd_new 1660 }, 1661 { .cmd = OVS_DP_CMD_DEL, 1662 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1663 .policy = datapath_policy, 1664 .doit = ovs_dp_cmd_del 1665 }, 1666 { .cmd = OVS_DP_CMD_GET, 1667 .flags = 0, /* OK for unprivileged users. */ 1668 .policy = datapath_policy, 1669 .doit = ovs_dp_cmd_get, 1670 .dumpit = ovs_dp_cmd_dump 1671 }, 1672 { .cmd = OVS_DP_CMD_SET, 1673 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1674 .policy = datapath_policy, 1675 .doit = ovs_dp_cmd_set, 1676 }, 1677 }; 1678 1679 static struct genl_family dp_datapath_genl_family = { 1680 .id = GENL_ID_GENERATE, 1681 .hdrsize = sizeof(struct ovs_header), 1682 .name = OVS_DATAPATH_FAMILY, 1683 .version = OVS_DATAPATH_VERSION, 1684 .maxattr = OVS_DP_ATTR_MAX, 1685 .netnsok = true, 1686 .parallel_ops = true, 1687 .ops = dp_datapath_genl_ops, 1688 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops), 1689 .mcgrps = &ovs_dp_datapath_multicast_group, 1690 .n_mcgrps = 1, 1691 }; 1692 1693 /* Called with ovs_mutex or RCU read lock. */ 1694 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1695 u32 portid, u32 seq, u32 flags, u8 cmd) 1696 { 1697 struct ovs_header *ovs_header; 1698 struct ovs_vport_stats vport_stats; 1699 int err; 1700 1701 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1702 flags, cmd); 1703 if (!ovs_header) 1704 return -EMSGSIZE; 1705 1706 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1707 1708 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1709 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1710 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 1711 vport->ops->get_name(vport))) 1712 goto nla_put_failure; 1713 1714 ovs_vport_get_stats(vport, &vport_stats); 1715 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), 1716 &vport_stats)) 1717 goto nla_put_failure; 1718 1719 if (ovs_vport_get_upcall_portids(vport, skb)) 1720 goto nla_put_failure; 1721 1722 err = ovs_vport_get_options(vport, skb); 1723 if (err == -EMSGSIZE) 1724 goto error; 1725 1726 return genlmsg_end(skb, ovs_header); 1727 1728 nla_put_failure: 1729 err = -EMSGSIZE; 1730 error: 1731 genlmsg_cancel(skb, ovs_header); 1732 return err; 1733 } 1734 1735 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 1736 { 1737 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1738 } 1739 1740 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 1741 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid, 1742 u32 seq, u8 cmd) 1743 { 1744 struct sk_buff *skb; 1745 int retval; 1746 1747 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1748 if (!skb) 1749 return ERR_PTR(-ENOMEM); 1750 1751 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd); 1752 BUG_ON(retval < 0); 1753 1754 return skb; 1755 } 1756 1757 /* Called with ovs_mutex or RCU read lock. */ 1758 static struct vport *lookup_vport(struct net *net, 1759 const struct ovs_header *ovs_header, 1760 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1761 { 1762 struct datapath *dp; 1763 struct vport *vport; 1764 1765 if (a[OVS_VPORT_ATTR_NAME]) { 1766 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 1767 if (!vport) 1768 return ERR_PTR(-ENODEV); 1769 if (ovs_header->dp_ifindex && 1770 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 1771 return ERR_PTR(-ENODEV); 1772 return vport; 1773 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 1774 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1775 1776 if (port_no >= DP_MAX_PORTS) 1777 return ERR_PTR(-EFBIG); 1778 1779 dp = get_dp(net, ovs_header->dp_ifindex); 1780 if (!dp) 1781 return ERR_PTR(-ENODEV); 1782 1783 vport = ovs_vport_ovsl_rcu(dp, port_no); 1784 if (!vport) 1785 return ERR_PTR(-ENODEV); 1786 return vport; 1787 } else 1788 return ERR_PTR(-EINVAL); 1789 } 1790 1791 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 1792 { 1793 struct nlattr **a = info->attrs; 1794 struct ovs_header *ovs_header = info->userhdr; 1795 struct vport_parms parms; 1796 struct sk_buff *reply; 1797 struct vport *vport; 1798 struct datapath *dp; 1799 u32 port_no; 1800 int err; 1801 1802 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 1803 !a[OVS_VPORT_ATTR_UPCALL_PID]) 1804 return -EINVAL; 1805 1806 port_no = a[OVS_VPORT_ATTR_PORT_NO] 1807 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 1808 if (port_no >= DP_MAX_PORTS) 1809 return -EFBIG; 1810 1811 reply = ovs_vport_cmd_alloc_info(); 1812 if (!reply) 1813 return -ENOMEM; 1814 1815 ovs_lock(); 1816 restart: 1817 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1818 err = -ENODEV; 1819 if (!dp) 1820 goto exit_unlock_free; 1821 1822 if (port_no) { 1823 vport = ovs_vport_ovsl(dp, port_no); 1824 err = -EBUSY; 1825 if (vport) 1826 goto exit_unlock_free; 1827 } else { 1828 for (port_no = 1; ; port_no++) { 1829 if (port_no >= DP_MAX_PORTS) { 1830 err = -EFBIG; 1831 goto exit_unlock_free; 1832 } 1833 vport = ovs_vport_ovsl(dp, port_no); 1834 if (!vport) 1835 break; 1836 } 1837 } 1838 1839 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 1840 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 1841 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 1842 parms.dp = dp; 1843 parms.port_no = port_no; 1844 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 1845 1846 vport = new_vport(&parms); 1847 err = PTR_ERR(vport); 1848 if (IS_ERR(vport)) { 1849 if (err == -EAGAIN) 1850 goto restart; 1851 goto exit_unlock_free; 1852 } 1853 1854 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 1855 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 1856 BUG_ON(err < 0); 1857 ovs_unlock(); 1858 1859 ovs_notify(&dp_vport_genl_family, reply, info); 1860 return 0; 1861 1862 exit_unlock_free: 1863 ovs_unlock(); 1864 kfree_skb(reply); 1865 return err; 1866 } 1867 1868 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 1869 { 1870 struct nlattr **a = info->attrs; 1871 struct sk_buff *reply; 1872 struct vport *vport; 1873 int err; 1874 1875 reply = ovs_vport_cmd_alloc_info(); 1876 if (!reply) 1877 return -ENOMEM; 1878 1879 ovs_lock(); 1880 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1881 err = PTR_ERR(vport); 1882 if (IS_ERR(vport)) 1883 goto exit_unlock_free; 1884 1885 if (a[OVS_VPORT_ATTR_TYPE] && 1886 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 1887 err = -EINVAL; 1888 goto exit_unlock_free; 1889 } 1890 1891 if (a[OVS_VPORT_ATTR_OPTIONS]) { 1892 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 1893 if (err) 1894 goto exit_unlock_free; 1895 } 1896 1897 1898 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 1899 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 1900 1901 err = ovs_vport_set_upcall_portids(vport, ids); 1902 if (err) 1903 goto exit_unlock_free; 1904 } 1905 1906 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 1907 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 1908 BUG_ON(err < 0); 1909 1910 ovs_unlock(); 1911 ovs_notify(&dp_vport_genl_family, reply, info); 1912 return 0; 1913 1914 exit_unlock_free: 1915 ovs_unlock(); 1916 kfree_skb(reply); 1917 return err; 1918 } 1919 1920 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 1921 { 1922 struct nlattr **a = info->attrs; 1923 struct sk_buff *reply; 1924 struct vport *vport; 1925 int err; 1926 1927 reply = ovs_vport_cmd_alloc_info(); 1928 if (!reply) 1929 return -ENOMEM; 1930 1931 ovs_lock(); 1932 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1933 err = PTR_ERR(vport); 1934 if (IS_ERR(vport)) 1935 goto exit_unlock_free; 1936 1937 if (vport->port_no == OVSP_LOCAL) { 1938 err = -EINVAL; 1939 goto exit_unlock_free; 1940 } 1941 1942 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 1943 info->snd_seq, 0, OVS_VPORT_CMD_DEL); 1944 BUG_ON(err < 0); 1945 ovs_dp_detach_port(vport); 1946 ovs_unlock(); 1947 1948 ovs_notify(&dp_vport_genl_family, reply, info); 1949 return 0; 1950 1951 exit_unlock_free: 1952 ovs_unlock(); 1953 kfree_skb(reply); 1954 return err; 1955 } 1956 1957 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 1958 { 1959 struct nlattr **a = info->attrs; 1960 struct ovs_header *ovs_header = info->userhdr; 1961 struct sk_buff *reply; 1962 struct vport *vport; 1963 int err; 1964 1965 reply = ovs_vport_cmd_alloc_info(); 1966 if (!reply) 1967 return -ENOMEM; 1968 1969 rcu_read_lock(); 1970 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 1971 err = PTR_ERR(vport); 1972 if (IS_ERR(vport)) 1973 goto exit_unlock_free; 1974 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 1975 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 1976 BUG_ON(err < 0); 1977 rcu_read_unlock(); 1978 1979 return genlmsg_reply(reply, info); 1980 1981 exit_unlock_free: 1982 rcu_read_unlock(); 1983 kfree_skb(reply); 1984 return err; 1985 } 1986 1987 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1988 { 1989 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1990 struct datapath *dp; 1991 int bucket = cb->args[0], skip = cb->args[1]; 1992 int i, j = 0; 1993 1994 rcu_read_lock(); 1995 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1996 if (!dp) { 1997 rcu_read_unlock(); 1998 return -ENODEV; 1999 } 2000 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2001 struct vport *vport; 2002 2003 j = 0; 2004 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2005 if (j >= skip && 2006 ovs_vport_cmd_fill_info(vport, skb, 2007 NETLINK_CB(cb->skb).portid, 2008 cb->nlh->nlmsg_seq, 2009 NLM_F_MULTI, 2010 OVS_VPORT_CMD_NEW) < 0) 2011 goto out; 2012 2013 j++; 2014 } 2015 skip = 0; 2016 } 2017 out: 2018 rcu_read_unlock(); 2019 2020 cb->args[0] = i; 2021 cb->args[1] = j; 2022 2023 return skb->len; 2024 } 2025 2026 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2027 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2028 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2029 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2030 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2031 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 2032 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2033 }; 2034 2035 static const struct genl_ops dp_vport_genl_ops[] = { 2036 { .cmd = OVS_VPORT_CMD_NEW, 2037 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2038 .policy = vport_policy, 2039 .doit = ovs_vport_cmd_new 2040 }, 2041 { .cmd = OVS_VPORT_CMD_DEL, 2042 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2043 .policy = vport_policy, 2044 .doit = ovs_vport_cmd_del 2045 }, 2046 { .cmd = OVS_VPORT_CMD_GET, 2047 .flags = 0, /* OK for unprivileged users. */ 2048 .policy = vport_policy, 2049 .doit = ovs_vport_cmd_get, 2050 .dumpit = ovs_vport_cmd_dump 2051 }, 2052 { .cmd = OVS_VPORT_CMD_SET, 2053 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2054 .policy = vport_policy, 2055 .doit = ovs_vport_cmd_set, 2056 }, 2057 }; 2058 2059 struct genl_family dp_vport_genl_family = { 2060 .id = GENL_ID_GENERATE, 2061 .hdrsize = sizeof(struct ovs_header), 2062 .name = OVS_VPORT_FAMILY, 2063 .version = OVS_VPORT_VERSION, 2064 .maxattr = OVS_VPORT_ATTR_MAX, 2065 .netnsok = true, 2066 .parallel_ops = true, 2067 .ops = dp_vport_genl_ops, 2068 .n_ops = ARRAY_SIZE(dp_vport_genl_ops), 2069 .mcgrps = &ovs_dp_vport_multicast_group, 2070 .n_mcgrps = 1, 2071 }; 2072 2073 static struct genl_family * const dp_genl_families[] = { 2074 &dp_datapath_genl_family, 2075 &dp_vport_genl_family, 2076 &dp_flow_genl_family, 2077 &dp_packet_genl_family, 2078 }; 2079 2080 static void dp_unregister_genl(int n_families) 2081 { 2082 int i; 2083 2084 for (i = 0; i < n_families; i++) 2085 genl_unregister_family(dp_genl_families[i]); 2086 } 2087 2088 static int dp_register_genl(void) 2089 { 2090 int err; 2091 int i; 2092 2093 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2094 2095 err = genl_register_family(dp_genl_families[i]); 2096 if (err) 2097 goto error; 2098 } 2099 2100 return 0; 2101 2102 error: 2103 dp_unregister_genl(i); 2104 return err; 2105 } 2106 2107 static int __net_init ovs_init_net(struct net *net) 2108 { 2109 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2110 2111 INIT_LIST_HEAD(&ovs_net->dps); 2112 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2113 return 0; 2114 } 2115 2116 static void __net_exit ovs_exit_net(struct net *net) 2117 { 2118 struct datapath *dp, *dp_next; 2119 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2120 2121 ovs_lock(); 2122 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2123 __dp_destroy(dp); 2124 ovs_unlock(); 2125 2126 cancel_work_sync(&ovs_net->dp_notify_work); 2127 } 2128 2129 static struct pernet_operations ovs_net_ops = { 2130 .init = ovs_init_net, 2131 .exit = ovs_exit_net, 2132 .id = &ovs_net_id, 2133 .size = sizeof(struct ovs_net), 2134 }; 2135 2136 static int __init dp_init(void) 2137 { 2138 int err; 2139 2140 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); 2141 2142 pr_info("Open vSwitch switching datapath\n"); 2143 2144 err = action_fifos_init(); 2145 if (err) 2146 goto error; 2147 2148 err = ovs_internal_dev_rtnl_link_register(); 2149 if (err) 2150 goto error_action_fifos_exit; 2151 2152 err = ovs_flow_init(); 2153 if (err) 2154 goto error_unreg_rtnl_link; 2155 2156 err = ovs_vport_init(); 2157 if (err) 2158 goto error_flow_exit; 2159 2160 err = register_pernet_device(&ovs_net_ops); 2161 if (err) 2162 goto error_vport_exit; 2163 2164 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2165 if (err) 2166 goto error_netns_exit; 2167 2168 err = ovs_netdev_init(); 2169 if (err) 2170 goto error_unreg_notifier; 2171 2172 err = dp_register_genl(); 2173 if (err < 0) 2174 goto error_unreg_netdev; 2175 2176 return 0; 2177 2178 error_unreg_netdev: 2179 ovs_netdev_exit(); 2180 error_unreg_notifier: 2181 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2182 error_netns_exit: 2183 unregister_pernet_device(&ovs_net_ops); 2184 error_vport_exit: 2185 ovs_vport_exit(); 2186 error_flow_exit: 2187 ovs_flow_exit(); 2188 error_unreg_rtnl_link: 2189 ovs_internal_dev_rtnl_link_unregister(); 2190 error_action_fifos_exit: 2191 action_fifos_exit(); 2192 error: 2193 return err; 2194 } 2195 2196 static void dp_cleanup(void) 2197 { 2198 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2199 ovs_netdev_exit(); 2200 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2201 unregister_pernet_device(&ovs_net_ops); 2202 rcu_barrier(); 2203 ovs_vport_exit(); 2204 ovs_flow_exit(); 2205 ovs_internal_dev_rtnl_link_unregister(); 2206 action_fifos_exit(); 2207 } 2208 2209 module_init(dp_init); 2210 module_exit(dp_cleanup); 2211 2212 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2213 MODULE_LICENSE("GPL"); 2214