1 /* 2 * Copyright (c) 2007-2012 Nicira Networks. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of version 2 of the GNU General Public 6 * License as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 * General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program; if not, write to the Free Software 15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 16 * 02110-1301, USA 17 */ 18 19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 20 21 #include <linux/init.h> 22 #include <linux/module.h> 23 #include <linux/if_arp.h> 24 #include <linux/if_vlan.h> 25 #include <linux/in.h> 26 #include <linux/ip.h> 27 #include <linux/jhash.h> 28 #include <linux/delay.h> 29 #include <linux/time.h> 30 #include <linux/etherdevice.h> 31 #include <linux/genetlink.h> 32 #include <linux/kernel.h> 33 #include <linux/kthread.h> 34 #include <linux/mutex.h> 35 #include <linux/percpu.h> 36 #include <linux/rcupdate.h> 37 #include <linux/tcp.h> 38 #include <linux/udp.h> 39 #include <linux/ethtool.h> 40 #include <linux/wait.h> 41 #include <asm/div64.h> 42 #include <linux/highmem.h> 43 #include <linux/netfilter_bridge.h> 44 #include <linux/netfilter_ipv4.h> 45 #include <linux/inetdevice.h> 46 #include <linux/list.h> 47 #include <linux/openvswitch.h> 48 #include <linux/rculist.h> 49 #include <linux/dmi.h> 50 #include <linux/workqueue.h> 51 #include <net/genetlink.h> 52 53 #include "datapath.h" 54 #include "flow.h" 55 #include "vport-internal_dev.h" 56 57 /** 58 * DOC: Locking: 59 * 60 * Writes to device state (add/remove datapath, port, set operations on vports, 61 * etc.) are protected by RTNL. 62 * 63 * Writes to other state (flow table modifications, set miscellaneous datapath 64 * parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside 65 * genl_mutex. 66 * 67 * Reads are protected by RCU. 68 * 69 * There are a few special cases (mostly stats) that have their own 70 * synchronization but they nest under all of above and don't interact with 71 * each other. 72 */ 73 74 /* Global list of datapaths to enable dumping them all out. 75 * Protected by genl_mutex. 76 */ 77 static LIST_HEAD(dps); 78 79 #define REHASH_FLOW_INTERVAL (10 * 60 * HZ) 80 static void rehash_flow_table(struct work_struct *work); 81 static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table); 82 83 static struct vport *new_vport(const struct vport_parms *); 84 static int queue_gso_packets(int dp_ifindex, struct sk_buff *, 85 const struct dp_upcall_info *); 86 static int queue_userspace_packet(int dp_ifindex, struct sk_buff *, 87 const struct dp_upcall_info *); 88 89 /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */ 90 static struct datapath *get_dp(int dp_ifindex) 91 { 92 struct datapath *dp = NULL; 93 struct net_device *dev; 94 95 rcu_read_lock(); 96 dev = dev_get_by_index_rcu(&init_net, dp_ifindex); 97 if (dev) { 98 struct vport *vport = ovs_internal_dev_get_vport(dev); 99 if (vport) 100 dp = vport->dp; 101 } 102 rcu_read_unlock(); 103 104 return dp; 105 } 106 107 /* Must be called with rcu_read_lock or RTNL lock. */ 108 const char *ovs_dp_name(const struct datapath *dp) 109 { 110 struct vport *vport = rcu_dereference_rtnl(dp->ports[OVSP_LOCAL]); 111 return vport->ops->get_name(vport); 112 } 113 114 static int get_dpifindex(struct datapath *dp) 115 { 116 struct vport *local; 117 int ifindex; 118 119 rcu_read_lock(); 120 121 local = rcu_dereference(dp->ports[OVSP_LOCAL]); 122 if (local) 123 ifindex = local->ops->get_ifindex(local); 124 else 125 ifindex = 0; 126 127 rcu_read_unlock(); 128 129 return ifindex; 130 } 131 132 static void destroy_dp_rcu(struct rcu_head *rcu) 133 { 134 struct datapath *dp = container_of(rcu, struct datapath, rcu); 135 136 ovs_flow_tbl_destroy((__force struct flow_table *)dp->table); 137 free_percpu(dp->stats_percpu); 138 kfree(dp); 139 } 140 141 /* Called with RTNL lock and genl_lock. */ 142 static struct vport *new_vport(const struct vport_parms *parms) 143 { 144 struct vport *vport; 145 146 vport = ovs_vport_add(parms); 147 if (!IS_ERR(vport)) { 148 struct datapath *dp = parms->dp; 149 150 rcu_assign_pointer(dp->ports[parms->port_no], vport); 151 list_add(&vport->node, &dp->port_list); 152 } 153 154 return vport; 155 } 156 157 /* Called with RTNL lock. */ 158 void ovs_dp_detach_port(struct vport *p) 159 { 160 ASSERT_RTNL(); 161 162 /* First drop references to device. */ 163 list_del(&p->node); 164 rcu_assign_pointer(p->dp->ports[p->port_no], NULL); 165 166 /* Then destroy it. */ 167 ovs_vport_del(p); 168 } 169 170 /* Must be called with rcu_read_lock. */ 171 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb) 172 { 173 struct datapath *dp = p->dp; 174 struct sw_flow *flow; 175 struct dp_stats_percpu *stats; 176 struct sw_flow_key key; 177 u64 *stats_counter; 178 int error; 179 int key_len; 180 181 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id()); 182 183 /* Extract flow from 'skb' into 'key'. */ 184 error = ovs_flow_extract(skb, p->port_no, &key, &key_len); 185 if (unlikely(error)) { 186 kfree_skb(skb); 187 return; 188 } 189 190 /* Look up flow. */ 191 flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len); 192 if (unlikely(!flow)) { 193 struct dp_upcall_info upcall; 194 195 upcall.cmd = OVS_PACKET_CMD_MISS; 196 upcall.key = &key; 197 upcall.userdata = NULL; 198 upcall.pid = p->upcall_pid; 199 ovs_dp_upcall(dp, skb, &upcall); 200 consume_skb(skb); 201 stats_counter = &stats->n_missed; 202 goto out; 203 } 204 205 OVS_CB(skb)->flow = flow; 206 207 stats_counter = &stats->n_hit; 208 ovs_flow_used(OVS_CB(skb)->flow, skb); 209 ovs_execute_actions(dp, skb); 210 211 out: 212 /* Update datapath statistics. */ 213 u64_stats_update_begin(&stats->sync); 214 (*stats_counter)++; 215 u64_stats_update_end(&stats->sync); 216 } 217 218 static struct genl_family dp_packet_genl_family = { 219 .id = GENL_ID_GENERATE, 220 .hdrsize = sizeof(struct ovs_header), 221 .name = OVS_PACKET_FAMILY, 222 .version = OVS_PACKET_VERSION, 223 .maxattr = OVS_PACKET_ATTR_MAX 224 }; 225 226 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 227 const struct dp_upcall_info *upcall_info) 228 { 229 struct dp_stats_percpu *stats; 230 int dp_ifindex; 231 int err; 232 233 if (upcall_info->pid == 0) { 234 err = -ENOTCONN; 235 goto err; 236 } 237 238 dp_ifindex = get_dpifindex(dp); 239 if (!dp_ifindex) { 240 err = -ENODEV; 241 goto err; 242 } 243 244 if (!skb_is_gso(skb)) 245 err = queue_userspace_packet(dp_ifindex, skb, upcall_info); 246 else 247 err = queue_gso_packets(dp_ifindex, skb, upcall_info); 248 if (err) 249 goto err; 250 251 return 0; 252 253 err: 254 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id()); 255 256 u64_stats_update_begin(&stats->sync); 257 stats->n_lost++; 258 u64_stats_update_end(&stats->sync); 259 260 return err; 261 } 262 263 static int queue_gso_packets(int dp_ifindex, struct sk_buff *skb, 264 const struct dp_upcall_info *upcall_info) 265 { 266 struct dp_upcall_info later_info; 267 struct sw_flow_key later_key; 268 struct sk_buff *segs, *nskb; 269 int err; 270 271 segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM); 272 if (IS_ERR(skb)) 273 return PTR_ERR(skb); 274 275 /* Queue all of the segments. */ 276 skb = segs; 277 do { 278 err = queue_userspace_packet(dp_ifindex, skb, upcall_info); 279 if (err) 280 break; 281 282 if (skb == segs && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) { 283 /* The initial flow key extracted by ovs_flow_extract() 284 * in this case is for a first fragment, so we need to 285 * properly mark later fragments. 286 */ 287 later_key = *upcall_info->key; 288 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 289 290 later_info = *upcall_info; 291 later_info.key = &later_key; 292 upcall_info = &later_info; 293 } 294 } while ((skb = skb->next)); 295 296 /* Free all of the segments. */ 297 skb = segs; 298 do { 299 nskb = skb->next; 300 if (err) 301 kfree_skb(skb); 302 else 303 consume_skb(skb); 304 } while ((skb = nskb)); 305 return err; 306 } 307 308 static int queue_userspace_packet(int dp_ifindex, struct sk_buff *skb, 309 const struct dp_upcall_info *upcall_info) 310 { 311 struct ovs_header *upcall; 312 struct sk_buff *nskb = NULL; 313 struct sk_buff *user_skb; /* to be queued to userspace */ 314 struct nlattr *nla; 315 unsigned int len; 316 int err; 317 318 if (vlan_tx_tag_present(skb)) { 319 nskb = skb_clone(skb, GFP_ATOMIC); 320 if (!nskb) 321 return -ENOMEM; 322 323 nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb)); 324 if (!skb) 325 return -ENOMEM; 326 327 nskb->vlan_tci = 0; 328 skb = nskb; 329 } 330 331 if (nla_attr_size(skb->len) > USHRT_MAX) { 332 err = -EFBIG; 333 goto out; 334 } 335 336 len = sizeof(struct ovs_header); 337 len += nla_total_size(skb->len); 338 len += nla_total_size(FLOW_BUFSIZE); 339 if (upcall_info->cmd == OVS_PACKET_CMD_ACTION) 340 len += nla_total_size(8); 341 342 user_skb = genlmsg_new(len, GFP_ATOMIC); 343 if (!user_skb) { 344 err = -ENOMEM; 345 goto out; 346 } 347 348 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 349 0, upcall_info->cmd); 350 upcall->dp_ifindex = dp_ifindex; 351 352 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY); 353 ovs_flow_to_nlattrs(upcall_info->key, user_skb); 354 nla_nest_end(user_skb, nla); 355 356 if (upcall_info->userdata) 357 nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA, 358 nla_get_u64(upcall_info->userdata)); 359 360 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len); 361 362 skb_copy_and_csum_dev(skb, nla_data(nla)); 363 364 err = genlmsg_unicast(&init_net, user_skb, upcall_info->pid); 365 366 out: 367 kfree_skb(nskb); 368 return err; 369 } 370 371 /* Called with genl_mutex. */ 372 static int flush_flows(int dp_ifindex) 373 { 374 struct flow_table *old_table; 375 struct flow_table *new_table; 376 struct datapath *dp; 377 378 dp = get_dp(dp_ifindex); 379 if (!dp) 380 return -ENODEV; 381 382 old_table = genl_dereference(dp->table); 383 new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS); 384 if (!new_table) 385 return -ENOMEM; 386 387 rcu_assign_pointer(dp->table, new_table); 388 389 ovs_flow_tbl_deferred_destroy(old_table); 390 return 0; 391 } 392 393 static int validate_actions(const struct nlattr *attr, 394 const struct sw_flow_key *key, int depth); 395 396 static int validate_sample(const struct nlattr *attr, 397 const struct sw_flow_key *key, int depth) 398 { 399 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1]; 400 const struct nlattr *probability, *actions; 401 const struct nlattr *a; 402 int rem; 403 404 memset(attrs, 0, sizeof(attrs)); 405 nla_for_each_nested(a, attr, rem) { 406 int type = nla_type(a); 407 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type]) 408 return -EINVAL; 409 attrs[type] = a; 410 } 411 if (rem) 412 return -EINVAL; 413 414 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY]; 415 if (!probability || nla_len(probability) != sizeof(u32)) 416 return -EINVAL; 417 418 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS]; 419 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN)) 420 return -EINVAL; 421 return validate_actions(actions, key, depth + 1); 422 } 423 424 static int validate_set(const struct nlattr *a, 425 const struct sw_flow_key *flow_key) 426 { 427 const struct nlattr *ovs_key = nla_data(a); 428 int key_type = nla_type(ovs_key); 429 430 /* There can be only one key in a action */ 431 if (nla_total_size(nla_len(ovs_key)) != nla_len(a)) 432 return -EINVAL; 433 434 if (key_type > OVS_KEY_ATTR_MAX || 435 nla_len(ovs_key) != ovs_key_lens[key_type]) 436 return -EINVAL; 437 438 switch (key_type) { 439 const struct ovs_key_ipv4 *ipv4_key; 440 441 case OVS_KEY_ATTR_PRIORITY: 442 case OVS_KEY_ATTR_ETHERNET: 443 break; 444 445 case OVS_KEY_ATTR_IPV4: 446 if (flow_key->eth.type != htons(ETH_P_IP)) 447 return -EINVAL; 448 449 if (!flow_key->ipv4.addr.src || !flow_key->ipv4.addr.dst) 450 return -EINVAL; 451 452 ipv4_key = nla_data(ovs_key); 453 if (ipv4_key->ipv4_proto != flow_key->ip.proto) 454 return -EINVAL; 455 456 if (ipv4_key->ipv4_frag != flow_key->ip.frag) 457 return -EINVAL; 458 459 break; 460 461 case OVS_KEY_ATTR_TCP: 462 if (flow_key->ip.proto != IPPROTO_TCP) 463 return -EINVAL; 464 465 if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst) 466 return -EINVAL; 467 468 break; 469 470 case OVS_KEY_ATTR_UDP: 471 if (flow_key->ip.proto != IPPROTO_UDP) 472 return -EINVAL; 473 474 if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst) 475 return -EINVAL; 476 break; 477 478 default: 479 return -EINVAL; 480 } 481 482 return 0; 483 } 484 485 static int validate_userspace(const struct nlattr *attr) 486 { 487 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = { 488 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 }, 489 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 }, 490 }; 491 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1]; 492 int error; 493 494 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX, 495 attr, userspace_policy); 496 if (error) 497 return error; 498 499 if (!a[OVS_USERSPACE_ATTR_PID] || 500 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID])) 501 return -EINVAL; 502 503 return 0; 504 } 505 506 static int validate_actions(const struct nlattr *attr, 507 const struct sw_flow_key *key, int depth) 508 { 509 const struct nlattr *a; 510 int rem, err; 511 512 if (depth >= SAMPLE_ACTION_DEPTH) 513 return -EOVERFLOW; 514 515 nla_for_each_nested(a, attr, rem) { 516 /* Expected argument lengths, (u32)-1 for variable length. */ 517 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = { 518 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32), 519 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1, 520 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan), 521 [OVS_ACTION_ATTR_POP_VLAN] = 0, 522 [OVS_ACTION_ATTR_SET] = (u32)-1, 523 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1 524 }; 525 const struct ovs_action_push_vlan *vlan; 526 int type = nla_type(a); 527 528 if (type > OVS_ACTION_ATTR_MAX || 529 (action_lens[type] != nla_len(a) && 530 action_lens[type] != (u32)-1)) 531 return -EINVAL; 532 533 switch (type) { 534 case OVS_ACTION_ATTR_UNSPEC: 535 return -EINVAL; 536 537 case OVS_ACTION_ATTR_USERSPACE: 538 err = validate_userspace(a); 539 if (err) 540 return err; 541 break; 542 543 case OVS_ACTION_ATTR_OUTPUT: 544 if (nla_get_u32(a) >= DP_MAX_PORTS) 545 return -EINVAL; 546 break; 547 548 549 case OVS_ACTION_ATTR_POP_VLAN: 550 break; 551 552 case OVS_ACTION_ATTR_PUSH_VLAN: 553 vlan = nla_data(a); 554 if (vlan->vlan_tpid != htons(ETH_P_8021Q)) 555 return -EINVAL; 556 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT))) 557 return -EINVAL; 558 break; 559 560 case OVS_ACTION_ATTR_SET: 561 err = validate_set(a, key); 562 if (err) 563 return err; 564 break; 565 566 case OVS_ACTION_ATTR_SAMPLE: 567 err = validate_sample(a, key, depth); 568 if (err) 569 return err; 570 break; 571 572 default: 573 return -EINVAL; 574 } 575 } 576 577 if (rem > 0) 578 return -EINVAL; 579 580 return 0; 581 } 582 583 static void clear_stats(struct sw_flow *flow) 584 { 585 flow->used = 0; 586 flow->tcp_flags = 0; 587 flow->packet_count = 0; 588 flow->byte_count = 0; 589 } 590 591 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 592 { 593 struct ovs_header *ovs_header = info->userhdr; 594 struct nlattr **a = info->attrs; 595 struct sw_flow_actions *acts; 596 struct sk_buff *packet; 597 struct sw_flow *flow; 598 struct datapath *dp; 599 struct ethhdr *eth; 600 int len; 601 int err; 602 int key_len; 603 604 err = -EINVAL; 605 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 606 !a[OVS_PACKET_ATTR_ACTIONS] || 607 nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN) 608 goto err; 609 610 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 611 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 612 err = -ENOMEM; 613 if (!packet) 614 goto err; 615 skb_reserve(packet, NET_IP_ALIGN); 616 617 memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len); 618 619 skb_reset_mac_header(packet); 620 eth = eth_hdr(packet); 621 622 /* Normally, setting the skb 'protocol' field would be handled by a 623 * call to eth_type_trans(), but it assumes there's a sending 624 * device, which we may not have. */ 625 if (ntohs(eth->h_proto) >= 1536) 626 packet->protocol = eth->h_proto; 627 else 628 packet->protocol = htons(ETH_P_802_2); 629 630 /* Build an sw_flow for sending this packet. */ 631 flow = ovs_flow_alloc(); 632 err = PTR_ERR(flow); 633 if (IS_ERR(flow)) 634 goto err_kfree_skb; 635 636 err = ovs_flow_extract(packet, -1, &flow->key, &key_len); 637 if (err) 638 goto err_flow_free; 639 640 err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority, 641 &flow->key.phy.in_port, 642 a[OVS_PACKET_ATTR_KEY]); 643 if (err) 644 goto err_flow_free; 645 646 err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0); 647 if (err) 648 goto err_flow_free; 649 650 flow->hash = ovs_flow_hash(&flow->key, key_len); 651 652 acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]); 653 err = PTR_ERR(acts); 654 if (IS_ERR(acts)) 655 goto err_flow_free; 656 rcu_assign_pointer(flow->sf_acts, acts); 657 658 OVS_CB(packet)->flow = flow; 659 packet->priority = flow->key.phy.priority; 660 661 rcu_read_lock(); 662 dp = get_dp(ovs_header->dp_ifindex); 663 err = -ENODEV; 664 if (!dp) 665 goto err_unlock; 666 667 local_bh_disable(); 668 err = ovs_execute_actions(dp, packet); 669 local_bh_enable(); 670 rcu_read_unlock(); 671 672 ovs_flow_free(flow); 673 return err; 674 675 err_unlock: 676 rcu_read_unlock(); 677 err_flow_free: 678 ovs_flow_free(flow); 679 err_kfree_skb: 680 kfree_skb(packet); 681 err: 682 return err; 683 } 684 685 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 686 [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC }, 687 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 688 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 689 }; 690 691 static struct genl_ops dp_packet_genl_ops[] = { 692 { .cmd = OVS_PACKET_CMD_EXECUTE, 693 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 694 .policy = packet_policy, 695 .doit = ovs_packet_cmd_execute 696 } 697 }; 698 699 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats) 700 { 701 int i; 702 struct flow_table *table = genl_dereference(dp->table); 703 704 stats->n_flows = ovs_flow_tbl_count(table); 705 706 stats->n_hit = stats->n_missed = stats->n_lost = 0; 707 for_each_possible_cpu(i) { 708 const struct dp_stats_percpu *percpu_stats; 709 struct dp_stats_percpu local_stats; 710 unsigned int start; 711 712 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 713 714 do { 715 start = u64_stats_fetch_begin_bh(&percpu_stats->sync); 716 local_stats = *percpu_stats; 717 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start)); 718 719 stats->n_hit += local_stats.n_hit; 720 stats->n_missed += local_stats.n_missed; 721 stats->n_lost += local_stats.n_lost; 722 } 723 } 724 725 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 726 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 727 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 728 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 729 }; 730 731 static struct genl_family dp_flow_genl_family = { 732 .id = GENL_ID_GENERATE, 733 .hdrsize = sizeof(struct ovs_header), 734 .name = OVS_FLOW_FAMILY, 735 .version = OVS_FLOW_VERSION, 736 .maxattr = OVS_FLOW_ATTR_MAX 737 }; 738 739 static struct genl_multicast_group ovs_dp_flow_multicast_group = { 740 .name = OVS_FLOW_MCGROUP 741 }; 742 743 /* Called with genl_lock. */ 744 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp, 745 struct sk_buff *skb, u32 pid, 746 u32 seq, u32 flags, u8 cmd) 747 { 748 const int skb_orig_len = skb->len; 749 const struct sw_flow_actions *sf_acts; 750 struct ovs_flow_stats stats; 751 struct ovs_header *ovs_header; 752 struct nlattr *nla; 753 unsigned long used; 754 u8 tcp_flags; 755 int err; 756 757 sf_acts = rcu_dereference_protected(flow->sf_acts, 758 lockdep_genl_is_held()); 759 760 ovs_header = genlmsg_put(skb, pid, seq, &dp_flow_genl_family, flags, cmd); 761 if (!ovs_header) 762 return -EMSGSIZE; 763 764 ovs_header->dp_ifindex = get_dpifindex(dp); 765 766 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY); 767 if (!nla) 768 goto nla_put_failure; 769 err = ovs_flow_to_nlattrs(&flow->key, skb); 770 if (err) 771 goto error; 772 nla_nest_end(skb, nla); 773 774 spin_lock_bh(&flow->lock); 775 used = flow->used; 776 stats.n_packets = flow->packet_count; 777 stats.n_bytes = flow->byte_count; 778 tcp_flags = flow->tcp_flags; 779 spin_unlock_bh(&flow->lock); 780 781 if (used) 782 NLA_PUT_U64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)); 783 784 if (stats.n_packets) 785 NLA_PUT(skb, OVS_FLOW_ATTR_STATS, 786 sizeof(struct ovs_flow_stats), &stats); 787 788 if (tcp_flags) 789 NLA_PUT_U8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags); 790 791 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 792 * this is the first flow to be dumped into 'skb'. This is unusual for 793 * Netlink but individual action lists can be longer than 794 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 795 * The userspace caller can always fetch the actions separately if it 796 * really wants them. (Most userspace callers in fact don't care.) 797 * 798 * This can only fail for dump operations because the skb is always 799 * properly sized for single flows. 800 */ 801 err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len, 802 sf_acts->actions); 803 if (err < 0 && skb_orig_len) 804 goto error; 805 806 return genlmsg_end(skb, ovs_header); 807 808 nla_put_failure: 809 err = -EMSGSIZE; 810 error: 811 genlmsg_cancel(skb, ovs_header); 812 return err; 813 } 814 815 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow) 816 { 817 const struct sw_flow_actions *sf_acts; 818 int len; 819 820 sf_acts = rcu_dereference_protected(flow->sf_acts, 821 lockdep_genl_is_held()); 822 823 /* OVS_FLOW_ATTR_KEY */ 824 len = nla_total_size(FLOW_BUFSIZE); 825 /* OVS_FLOW_ATTR_ACTIONS */ 826 len += nla_total_size(sf_acts->actions_len); 827 /* OVS_FLOW_ATTR_STATS */ 828 len += nla_total_size(sizeof(struct ovs_flow_stats)); 829 /* OVS_FLOW_ATTR_TCP_FLAGS */ 830 len += nla_total_size(1); 831 /* OVS_FLOW_ATTR_USED */ 832 len += nla_total_size(8); 833 834 len += NLMSG_ALIGN(sizeof(struct ovs_header)); 835 836 return genlmsg_new(len, GFP_KERNEL); 837 } 838 839 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow, 840 struct datapath *dp, 841 u32 pid, u32 seq, u8 cmd) 842 { 843 struct sk_buff *skb; 844 int retval; 845 846 skb = ovs_flow_cmd_alloc_info(flow); 847 if (!skb) 848 return ERR_PTR(-ENOMEM); 849 850 retval = ovs_flow_cmd_fill_info(flow, dp, skb, pid, seq, 0, cmd); 851 BUG_ON(retval < 0); 852 return skb; 853 } 854 855 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info) 856 { 857 struct nlattr **a = info->attrs; 858 struct ovs_header *ovs_header = info->userhdr; 859 struct sw_flow_key key; 860 struct sw_flow *flow; 861 struct sk_buff *reply; 862 struct datapath *dp; 863 struct flow_table *table; 864 int error; 865 int key_len; 866 867 /* Extract key. */ 868 error = -EINVAL; 869 if (!a[OVS_FLOW_ATTR_KEY]) 870 goto error; 871 error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); 872 if (error) 873 goto error; 874 875 /* Validate actions. */ 876 if (a[OVS_FLOW_ATTR_ACTIONS]) { 877 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0); 878 if (error) 879 goto error; 880 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) { 881 error = -EINVAL; 882 goto error; 883 } 884 885 dp = get_dp(ovs_header->dp_ifindex); 886 error = -ENODEV; 887 if (!dp) 888 goto error; 889 890 table = genl_dereference(dp->table); 891 flow = ovs_flow_tbl_lookup(table, &key, key_len); 892 if (!flow) { 893 struct sw_flow_actions *acts; 894 895 /* Bail out if we're not allowed to create a new flow. */ 896 error = -ENOENT; 897 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET) 898 goto error; 899 900 /* Expand table, if necessary, to make room. */ 901 if (ovs_flow_tbl_need_to_expand(table)) { 902 struct flow_table *new_table; 903 904 new_table = ovs_flow_tbl_expand(table); 905 if (!IS_ERR(new_table)) { 906 rcu_assign_pointer(dp->table, new_table); 907 ovs_flow_tbl_deferred_destroy(table); 908 table = genl_dereference(dp->table); 909 } 910 } 911 912 /* Allocate flow. */ 913 flow = ovs_flow_alloc(); 914 if (IS_ERR(flow)) { 915 error = PTR_ERR(flow); 916 goto error; 917 } 918 flow->key = key; 919 clear_stats(flow); 920 921 /* Obtain actions. */ 922 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]); 923 error = PTR_ERR(acts); 924 if (IS_ERR(acts)) 925 goto error_free_flow; 926 rcu_assign_pointer(flow->sf_acts, acts); 927 928 /* Put flow in bucket. */ 929 flow->hash = ovs_flow_hash(&key, key_len); 930 ovs_flow_tbl_insert(table, flow); 931 932 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid, 933 info->snd_seq, 934 OVS_FLOW_CMD_NEW); 935 } else { 936 /* We found a matching flow. */ 937 struct sw_flow_actions *old_acts; 938 struct nlattr *acts_attrs; 939 940 /* Bail out if we're not allowed to modify an existing flow. 941 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 942 * because Generic Netlink treats the latter as a dump 943 * request. We also accept NLM_F_EXCL in case that bug ever 944 * gets fixed. 945 */ 946 error = -EEXIST; 947 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW && 948 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL)) 949 goto error; 950 951 /* Update actions. */ 952 old_acts = rcu_dereference_protected(flow->sf_acts, 953 lockdep_genl_is_held()); 954 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS]; 955 if (acts_attrs && 956 (old_acts->actions_len != nla_len(acts_attrs) || 957 memcmp(old_acts->actions, nla_data(acts_attrs), 958 old_acts->actions_len))) { 959 struct sw_flow_actions *new_acts; 960 961 new_acts = ovs_flow_actions_alloc(acts_attrs); 962 error = PTR_ERR(new_acts); 963 if (IS_ERR(new_acts)) 964 goto error; 965 966 rcu_assign_pointer(flow->sf_acts, new_acts); 967 ovs_flow_deferred_free_acts(old_acts); 968 } 969 970 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid, 971 info->snd_seq, OVS_FLOW_CMD_NEW); 972 973 /* Clear stats. */ 974 if (a[OVS_FLOW_ATTR_CLEAR]) { 975 spin_lock_bh(&flow->lock); 976 clear_stats(flow); 977 spin_unlock_bh(&flow->lock); 978 } 979 } 980 981 if (!IS_ERR(reply)) 982 genl_notify(reply, genl_info_net(info), info->snd_pid, 983 ovs_dp_flow_multicast_group.id, info->nlhdr, 984 GFP_KERNEL); 985 else 986 netlink_set_err(init_net.genl_sock, 0, 987 ovs_dp_flow_multicast_group.id, PTR_ERR(reply)); 988 return 0; 989 990 error_free_flow: 991 ovs_flow_free(flow); 992 error: 993 return error; 994 } 995 996 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 997 { 998 struct nlattr **a = info->attrs; 999 struct ovs_header *ovs_header = info->userhdr; 1000 struct sw_flow_key key; 1001 struct sk_buff *reply; 1002 struct sw_flow *flow; 1003 struct datapath *dp; 1004 struct flow_table *table; 1005 int err; 1006 int key_len; 1007 1008 if (!a[OVS_FLOW_ATTR_KEY]) 1009 return -EINVAL; 1010 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); 1011 if (err) 1012 return err; 1013 1014 dp = get_dp(ovs_header->dp_ifindex); 1015 if (!dp) 1016 return -ENODEV; 1017 1018 table = genl_dereference(dp->table); 1019 flow = ovs_flow_tbl_lookup(table, &key, key_len); 1020 if (!flow) 1021 return -ENOENT; 1022 1023 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid, 1024 info->snd_seq, OVS_FLOW_CMD_NEW); 1025 if (IS_ERR(reply)) 1026 return PTR_ERR(reply); 1027 1028 return genlmsg_reply(reply, info); 1029 } 1030 1031 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1032 { 1033 struct nlattr **a = info->attrs; 1034 struct ovs_header *ovs_header = info->userhdr; 1035 struct sw_flow_key key; 1036 struct sk_buff *reply; 1037 struct sw_flow *flow; 1038 struct datapath *dp; 1039 struct flow_table *table; 1040 int err; 1041 int key_len; 1042 1043 if (!a[OVS_FLOW_ATTR_KEY]) 1044 return flush_flows(ovs_header->dp_ifindex); 1045 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); 1046 if (err) 1047 return err; 1048 1049 dp = get_dp(ovs_header->dp_ifindex); 1050 if (!dp) 1051 return -ENODEV; 1052 1053 table = genl_dereference(dp->table); 1054 flow = ovs_flow_tbl_lookup(table, &key, key_len); 1055 if (!flow) 1056 return -ENOENT; 1057 1058 reply = ovs_flow_cmd_alloc_info(flow); 1059 if (!reply) 1060 return -ENOMEM; 1061 1062 ovs_flow_tbl_remove(table, flow); 1063 1064 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_pid, 1065 info->snd_seq, 0, OVS_FLOW_CMD_DEL); 1066 BUG_ON(err < 0); 1067 1068 ovs_flow_deferred_free(flow); 1069 1070 genl_notify(reply, genl_info_net(info), info->snd_pid, 1071 ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL); 1072 return 0; 1073 } 1074 1075 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1076 { 1077 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1078 struct datapath *dp; 1079 struct flow_table *table; 1080 1081 dp = get_dp(ovs_header->dp_ifindex); 1082 if (!dp) 1083 return -ENODEV; 1084 1085 table = genl_dereference(dp->table); 1086 1087 for (;;) { 1088 struct sw_flow *flow; 1089 u32 bucket, obj; 1090 1091 bucket = cb->args[0]; 1092 obj = cb->args[1]; 1093 flow = ovs_flow_tbl_next(table, &bucket, &obj); 1094 if (!flow) 1095 break; 1096 1097 if (ovs_flow_cmd_fill_info(flow, dp, skb, 1098 NETLINK_CB(cb->skb).pid, 1099 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1100 OVS_FLOW_CMD_NEW) < 0) 1101 break; 1102 1103 cb->args[0] = bucket; 1104 cb->args[1] = obj; 1105 } 1106 return skb->len; 1107 } 1108 1109 static struct genl_ops dp_flow_genl_ops[] = { 1110 { .cmd = OVS_FLOW_CMD_NEW, 1111 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1112 .policy = flow_policy, 1113 .doit = ovs_flow_cmd_new_or_set 1114 }, 1115 { .cmd = OVS_FLOW_CMD_DEL, 1116 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1117 .policy = flow_policy, 1118 .doit = ovs_flow_cmd_del 1119 }, 1120 { .cmd = OVS_FLOW_CMD_GET, 1121 .flags = 0, /* OK for unprivileged users. */ 1122 .policy = flow_policy, 1123 .doit = ovs_flow_cmd_get, 1124 .dumpit = ovs_flow_cmd_dump 1125 }, 1126 { .cmd = OVS_FLOW_CMD_SET, 1127 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1128 .policy = flow_policy, 1129 .doit = ovs_flow_cmd_new_or_set, 1130 }, 1131 }; 1132 1133 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1134 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1135 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1136 }; 1137 1138 static struct genl_family dp_datapath_genl_family = { 1139 .id = GENL_ID_GENERATE, 1140 .hdrsize = sizeof(struct ovs_header), 1141 .name = OVS_DATAPATH_FAMILY, 1142 .version = OVS_DATAPATH_VERSION, 1143 .maxattr = OVS_DP_ATTR_MAX 1144 }; 1145 1146 static struct genl_multicast_group ovs_dp_datapath_multicast_group = { 1147 .name = OVS_DATAPATH_MCGROUP 1148 }; 1149 1150 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1151 u32 pid, u32 seq, u32 flags, u8 cmd) 1152 { 1153 struct ovs_header *ovs_header; 1154 struct ovs_dp_stats dp_stats; 1155 int err; 1156 1157 ovs_header = genlmsg_put(skb, pid, seq, &dp_datapath_genl_family, 1158 flags, cmd); 1159 if (!ovs_header) 1160 goto error; 1161 1162 ovs_header->dp_ifindex = get_dpifindex(dp); 1163 1164 rcu_read_lock(); 1165 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1166 rcu_read_unlock(); 1167 if (err) 1168 goto nla_put_failure; 1169 1170 get_dp_stats(dp, &dp_stats); 1171 NLA_PUT(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats); 1172 1173 return genlmsg_end(skb, ovs_header); 1174 1175 nla_put_failure: 1176 genlmsg_cancel(skb, ovs_header); 1177 error: 1178 return -EMSGSIZE; 1179 } 1180 1181 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 pid, 1182 u32 seq, u8 cmd) 1183 { 1184 struct sk_buff *skb; 1185 int retval; 1186 1187 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1188 if (!skb) 1189 return ERR_PTR(-ENOMEM); 1190 1191 retval = ovs_dp_cmd_fill_info(dp, skb, pid, seq, 0, cmd); 1192 if (retval < 0) { 1193 kfree_skb(skb); 1194 return ERR_PTR(retval); 1195 } 1196 return skb; 1197 } 1198 1199 /* Called with genl_mutex and optionally with RTNL lock also. */ 1200 static struct datapath *lookup_datapath(struct ovs_header *ovs_header, 1201 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1202 { 1203 struct datapath *dp; 1204 1205 if (!a[OVS_DP_ATTR_NAME]) 1206 dp = get_dp(ovs_header->dp_ifindex); 1207 else { 1208 struct vport *vport; 1209 1210 rcu_read_lock(); 1211 vport = ovs_vport_locate(nla_data(a[OVS_DP_ATTR_NAME])); 1212 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1213 rcu_read_unlock(); 1214 } 1215 return dp ? dp : ERR_PTR(-ENODEV); 1216 } 1217 1218 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1219 { 1220 struct nlattr **a = info->attrs; 1221 struct vport_parms parms; 1222 struct sk_buff *reply; 1223 struct datapath *dp; 1224 struct vport *vport; 1225 int err; 1226 1227 err = -EINVAL; 1228 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1229 goto err; 1230 1231 rtnl_lock(); 1232 err = -ENODEV; 1233 if (!try_module_get(THIS_MODULE)) 1234 goto err_unlock_rtnl; 1235 1236 err = -ENOMEM; 1237 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1238 if (dp == NULL) 1239 goto err_put_module; 1240 INIT_LIST_HEAD(&dp->port_list); 1241 1242 /* Allocate table. */ 1243 err = -ENOMEM; 1244 rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS)); 1245 if (!dp->table) 1246 goto err_free_dp; 1247 1248 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu); 1249 if (!dp->stats_percpu) { 1250 err = -ENOMEM; 1251 goto err_destroy_table; 1252 } 1253 1254 /* Set up our datapath device. */ 1255 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1256 parms.type = OVS_VPORT_TYPE_INTERNAL; 1257 parms.options = NULL; 1258 parms.dp = dp; 1259 parms.port_no = OVSP_LOCAL; 1260 parms.upcall_pid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]); 1261 1262 vport = new_vport(&parms); 1263 if (IS_ERR(vport)) { 1264 err = PTR_ERR(vport); 1265 if (err == -EBUSY) 1266 err = -EEXIST; 1267 1268 goto err_destroy_percpu; 1269 } 1270 1271 reply = ovs_dp_cmd_build_info(dp, info->snd_pid, 1272 info->snd_seq, OVS_DP_CMD_NEW); 1273 err = PTR_ERR(reply); 1274 if (IS_ERR(reply)) 1275 goto err_destroy_local_port; 1276 1277 list_add_tail(&dp->list_node, &dps); 1278 rtnl_unlock(); 1279 1280 genl_notify(reply, genl_info_net(info), info->snd_pid, 1281 ovs_dp_datapath_multicast_group.id, info->nlhdr, 1282 GFP_KERNEL); 1283 return 0; 1284 1285 err_destroy_local_port: 1286 ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL])); 1287 err_destroy_percpu: 1288 free_percpu(dp->stats_percpu); 1289 err_destroy_table: 1290 ovs_flow_tbl_destroy(genl_dereference(dp->table)); 1291 err_free_dp: 1292 kfree(dp); 1293 err_put_module: 1294 module_put(THIS_MODULE); 1295 err_unlock_rtnl: 1296 rtnl_unlock(); 1297 err: 1298 return err; 1299 } 1300 1301 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1302 { 1303 struct vport *vport, *next_vport; 1304 struct sk_buff *reply; 1305 struct datapath *dp; 1306 int err; 1307 1308 rtnl_lock(); 1309 dp = lookup_datapath(info->userhdr, info->attrs); 1310 err = PTR_ERR(dp); 1311 if (IS_ERR(dp)) 1312 goto exit_unlock; 1313 1314 reply = ovs_dp_cmd_build_info(dp, info->snd_pid, 1315 info->snd_seq, OVS_DP_CMD_DEL); 1316 err = PTR_ERR(reply); 1317 if (IS_ERR(reply)) 1318 goto exit_unlock; 1319 1320 list_for_each_entry_safe(vport, next_vport, &dp->port_list, node) 1321 if (vport->port_no != OVSP_LOCAL) 1322 ovs_dp_detach_port(vport); 1323 1324 list_del(&dp->list_node); 1325 ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL])); 1326 1327 /* rtnl_unlock() will wait until all the references to devices that 1328 * are pending unregistration have been dropped. We do it here to 1329 * ensure that any internal devices (which contain DP pointers) are 1330 * fully destroyed before freeing the datapath. 1331 */ 1332 rtnl_unlock(); 1333 1334 call_rcu(&dp->rcu, destroy_dp_rcu); 1335 module_put(THIS_MODULE); 1336 1337 genl_notify(reply, genl_info_net(info), info->snd_pid, 1338 ovs_dp_datapath_multicast_group.id, info->nlhdr, 1339 GFP_KERNEL); 1340 1341 return 0; 1342 1343 exit_unlock: 1344 rtnl_unlock(); 1345 return err; 1346 } 1347 1348 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1349 { 1350 struct sk_buff *reply; 1351 struct datapath *dp; 1352 int err; 1353 1354 dp = lookup_datapath(info->userhdr, info->attrs); 1355 if (IS_ERR(dp)) 1356 return PTR_ERR(dp); 1357 1358 reply = ovs_dp_cmd_build_info(dp, info->snd_pid, 1359 info->snd_seq, OVS_DP_CMD_NEW); 1360 if (IS_ERR(reply)) { 1361 err = PTR_ERR(reply); 1362 netlink_set_err(init_net.genl_sock, 0, 1363 ovs_dp_datapath_multicast_group.id, err); 1364 return 0; 1365 } 1366 1367 genl_notify(reply, genl_info_net(info), info->snd_pid, 1368 ovs_dp_datapath_multicast_group.id, info->nlhdr, 1369 GFP_KERNEL); 1370 1371 return 0; 1372 } 1373 1374 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1375 { 1376 struct sk_buff *reply; 1377 struct datapath *dp; 1378 1379 dp = lookup_datapath(info->userhdr, info->attrs); 1380 if (IS_ERR(dp)) 1381 return PTR_ERR(dp); 1382 1383 reply = ovs_dp_cmd_build_info(dp, info->snd_pid, 1384 info->snd_seq, OVS_DP_CMD_NEW); 1385 if (IS_ERR(reply)) 1386 return PTR_ERR(reply); 1387 1388 return genlmsg_reply(reply, info); 1389 } 1390 1391 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1392 { 1393 struct datapath *dp; 1394 int skip = cb->args[0]; 1395 int i = 0; 1396 1397 list_for_each_entry(dp, &dps, list_node) { 1398 if (i >= skip && 1399 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid, 1400 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1401 OVS_DP_CMD_NEW) < 0) 1402 break; 1403 i++; 1404 } 1405 1406 cb->args[0] = i; 1407 1408 return skb->len; 1409 } 1410 1411 static struct genl_ops dp_datapath_genl_ops[] = { 1412 { .cmd = OVS_DP_CMD_NEW, 1413 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1414 .policy = datapath_policy, 1415 .doit = ovs_dp_cmd_new 1416 }, 1417 { .cmd = OVS_DP_CMD_DEL, 1418 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1419 .policy = datapath_policy, 1420 .doit = ovs_dp_cmd_del 1421 }, 1422 { .cmd = OVS_DP_CMD_GET, 1423 .flags = 0, /* OK for unprivileged users. */ 1424 .policy = datapath_policy, 1425 .doit = ovs_dp_cmd_get, 1426 .dumpit = ovs_dp_cmd_dump 1427 }, 1428 { .cmd = OVS_DP_CMD_SET, 1429 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1430 .policy = datapath_policy, 1431 .doit = ovs_dp_cmd_set, 1432 }, 1433 }; 1434 1435 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 1436 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1437 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 1438 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 1439 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 1440 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1441 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 1442 }; 1443 1444 static struct genl_family dp_vport_genl_family = { 1445 .id = GENL_ID_GENERATE, 1446 .hdrsize = sizeof(struct ovs_header), 1447 .name = OVS_VPORT_FAMILY, 1448 .version = OVS_VPORT_VERSION, 1449 .maxattr = OVS_VPORT_ATTR_MAX 1450 }; 1451 1452 struct genl_multicast_group ovs_dp_vport_multicast_group = { 1453 .name = OVS_VPORT_MCGROUP 1454 }; 1455 1456 /* Called with RTNL lock or RCU read lock. */ 1457 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1458 u32 pid, u32 seq, u32 flags, u8 cmd) 1459 { 1460 struct ovs_header *ovs_header; 1461 struct ovs_vport_stats vport_stats; 1462 int err; 1463 1464 ovs_header = genlmsg_put(skb, pid, seq, &dp_vport_genl_family, 1465 flags, cmd); 1466 if (!ovs_header) 1467 return -EMSGSIZE; 1468 1469 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1470 1471 NLA_PUT_U32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no); 1472 NLA_PUT_U32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type); 1473 NLA_PUT_STRING(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)); 1474 NLA_PUT_U32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_pid); 1475 1476 ovs_vport_get_stats(vport, &vport_stats); 1477 NLA_PUT(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), 1478 &vport_stats); 1479 1480 err = ovs_vport_get_options(vport, skb); 1481 if (err == -EMSGSIZE) 1482 goto error; 1483 1484 return genlmsg_end(skb, ovs_header); 1485 1486 nla_put_failure: 1487 err = -EMSGSIZE; 1488 error: 1489 genlmsg_cancel(skb, ovs_header); 1490 return err; 1491 } 1492 1493 /* Called with RTNL lock or RCU read lock. */ 1494 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 pid, 1495 u32 seq, u8 cmd) 1496 { 1497 struct sk_buff *skb; 1498 int retval; 1499 1500 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1501 if (!skb) 1502 return ERR_PTR(-ENOMEM); 1503 1504 retval = ovs_vport_cmd_fill_info(vport, skb, pid, seq, 0, cmd); 1505 if (retval < 0) { 1506 kfree_skb(skb); 1507 return ERR_PTR(retval); 1508 } 1509 return skb; 1510 } 1511 1512 /* Called with RTNL lock or RCU read lock. */ 1513 static struct vport *lookup_vport(struct ovs_header *ovs_header, 1514 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1515 { 1516 struct datapath *dp; 1517 struct vport *vport; 1518 1519 if (a[OVS_VPORT_ATTR_NAME]) { 1520 vport = ovs_vport_locate(nla_data(a[OVS_VPORT_ATTR_NAME])); 1521 if (!vport) 1522 return ERR_PTR(-ENODEV); 1523 if (ovs_header->dp_ifindex && 1524 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 1525 return ERR_PTR(-ENODEV); 1526 return vport; 1527 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 1528 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1529 1530 if (port_no >= DP_MAX_PORTS) 1531 return ERR_PTR(-EFBIG); 1532 1533 dp = get_dp(ovs_header->dp_ifindex); 1534 if (!dp) 1535 return ERR_PTR(-ENODEV); 1536 1537 vport = rcu_dereference_rtnl(dp->ports[port_no]); 1538 if (!vport) 1539 return ERR_PTR(-ENOENT); 1540 return vport; 1541 } else 1542 return ERR_PTR(-EINVAL); 1543 } 1544 1545 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 1546 { 1547 struct nlattr **a = info->attrs; 1548 struct ovs_header *ovs_header = info->userhdr; 1549 struct vport_parms parms; 1550 struct sk_buff *reply; 1551 struct vport *vport; 1552 struct datapath *dp; 1553 u32 port_no; 1554 int err; 1555 1556 err = -EINVAL; 1557 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 1558 !a[OVS_VPORT_ATTR_UPCALL_PID]) 1559 goto exit; 1560 1561 rtnl_lock(); 1562 dp = get_dp(ovs_header->dp_ifindex); 1563 err = -ENODEV; 1564 if (!dp) 1565 goto exit_unlock; 1566 1567 if (a[OVS_VPORT_ATTR_PORT_NO]) { 1568 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1569 1570 err = -EFBIG; 1571 if (port_no >= DP_MAX_PORTS) 1572 goto exit_unlock; 1573 1574 vport = rtnl_dereference(dp->ports[port_no]); 1575 err = -EBUSY; 1576 if (vport) 1577 goto exit_unlock; 1578 } else { 1579 for (port_no = 1; ; port_no++) { 1580 if (port_no >= DP_MAX_PORTS) { 1581 err = -EFBIG; 1582 goto exit_unlock; 1583 } 1584 vport = rtnl_dereference(dp->ports[port_no]); 1585 if (!vport) 1586 break; 1587 } 1588 } 1589 1590 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 1591 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 1592 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 1593 parms.dp = dp; 1594 parms.port_no = port_no; 1595 parms.upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); 1596 1597 vport = new_vport(&parms); 1598 err = PTR_ERR(vport); 1599 if (IS_ERR(vport)) 1600 goto exit_unlock; 1601 1602 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq, 1603 OVS_VPORT_CMD_NEW); 1604 if (IS_ERR(reply)) { 1605 err = PTR_ERR(reply); 1606 ovs_dp_detach_port(vport); 1607 goto exit_unlock; 1608 } 1609 genl_notify(reply, genl_info_net(info), info->snd_pid, 1610 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); 1611 1612 exit_unlock: 1613 rtnl_unlock(); 1614 exit: 1615 return err; 1616 } 1617 1618 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 1619 { 1620 struct nlattr **a = info->attrs; 1621 struct sk_buff *reply; 1622 struct vport *vport; 1623 int err; 1624 1625 rtnl_lock(); 1626 vport = lookup_vport(info->userhdr, a); 1627 err = PTR_ERR(vport); 1628 if (IS_ERR(vport)) 1629 goto exit_unlock; 1630 1631 err = 0; 1632 if (a[OVS_VPORT_ATTR_TYPE] && 1633 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) 1634 err = -EINVAL; 1635 1636 if (!err && a[OVS_VPORT_ATTR_OPTIONS]) 1637 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 1638 if (!err && a[OVS_VPORT_ATTR_UPCALL_PID]) 1639 vport->upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); 1640 1641 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq, 1642 OVS_VPORT_CMD_NEW); 1643 if (IS_ERR(reply)) { 1644 err = PTR_ERR(reply); 1645 netlink_set_err(init_net.genl_sock, 0, 1646 ovs_dp_vport_multicast_group.id, err); 1647 return 0; 1648 } 1649 1650 genl_notify(reply, genl_info_net(info), info->snd_pid, 1651 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); 1652 1653 exit_unlock: 1654 rtnl_unlock(); 1655 return err; 1656 } 1657 1658 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 1659 { 1660 struct nlattr **a = info->attrs; 1661 struct sk_buff *reply; 1662 struct vport *vport; 1663 int err; 1664 1665 rtnl_lock(); 1666 vport = lookup_vport(info->userhdr, a); 1667 err = PTR_ERR(vport); 1668 if (IS_ERR(vport)) 1669 goto exit_unlock; 1670 1671 if (vport->port_no == OVSP_LOCAL) { 1672 err = -EINVAL; 1673 goto exit_unlock; 1674 } 1675 1676 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq, 1677 OVS_VPORT_CMD_DEL); 1678 err = PTR_ERR(reply); 1679 if (IS_ERR(reply)) 1680 goto exit_unlock; 1681 1682 ovs_dp_detach_port(vport); 1683 1684 genl_notify(reply, genl_info_net(info), info->snd_pid, 1685 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); 1686 1687 exit_unlock: 1688 rtnl_unlock(); 1689 return err; 1690 } 1691 1692 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 1693 { 1694 struct nlattr **a = info->attrs; 1695 struct ovs_header *ovs_header = info->userhdr; 1696 struct sk_buff *reply; 1697 struct vport *vport; 1698 int err; 1699 1700 rcu_read_lock(); 1701 vport = lookup_vport(ovs_header, a); 1702 err = PTR_ERR(vport); 1703 if (IS_ERR(vport)) 1704 goto exit_unlock; 1705 1706 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq, 1707 OVS_VPORT_CMD_NEW); 1708 err = PTR_ERR(reply); 1709 if (IS_ERR(reply)) 1710 goto exit_unlock; 1711 1712 rcu_read_unlock(); 1713 1714 return genlmsg_reply(reply, info); 1715 1716 exit_unlock: 1717 rcu_read_unlock(); 1718 return err; 1719 } 1720 1721 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1722 { 1723 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1724 struct datapath *dp; 1725 u32 port_no; 1726 int retval; 1727 1728 dp = get_dp(ovs_header->dp_ifindex); 1729 if (!dp) 1730 return -ENODEV; 1731 1732 rcu_read_lock(); 1733 for (port_no = cb->args[0]; port_no < DP_MAX_PORTS; port_no++) { 1734 struct vport *vport; 1735 1736 vport = rcu_dereference(dp->ports[port_no]); 1737 if (!vport) 1738 continue; 1739 1740 if (ovs_vport_cmd_fill_info(vport, skb, NETLINK_CB(cb->skb).pid, 1741 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1742 OVS_VPORT_CMD_NEW) < 0) 1743 break; 1744 } 1745 rcu_read_unlock(); 1746 1747 cb->args[0] = port_no; 1748 retval = skb->len; 1749 1750 return retval; 1751 } 1752 1753 static void rehash_flow_table(struct work_struct *work) 1754 { 1755 struct datapath *dp; 1756 1757 genl_lock(); 1758 1759 list_for_each_entry(dp, &dps, list_node) { 1760 struct flow_table *old_table = genl_dereference(dp->table); 1761 struct flow_table *new_table; 1762 1763 new_table = ovs_flow_tbl_rehash(old_table); 1764 if (!IS_ERR(new_table)) { 1765 rcu_assign_pointer(dp->table, new_table); 1766 ovs_flow_tbl_deferred_destroy(old_table); 1767 } 1768 } 1769 1770 genl_unlock(); 1771 1772 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); 1773 } 1774 1775 static struct genl_ops dp_vport_genl_ops[] = { 1776 { .cmd = OVS_VPORT_CMD_NEW, 1777 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1778 .policy = vport_policy, 1779 .doit = ovs_vport_cmd_new 1780 }, 1781 { .cmd = OVS_VPORT_CMD_DEL, 1782 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1783 .policy = vport_policy, 1784 .doit = ovs_vport_cmd_del 1785 }, 1786 { .cmd = OVS_VPORT_CMD_GET, 1787 .flags = 0, /* OK for unprivileged users. */ 1788 .policy = vport_policy, 1789 .doit = ovs_vport_cmd_get, 1790 .dumpit = ovs_vport_cmd_dump 1791 }, 1792 { .cmd = OVS_VPORT_CMD_SET, 1793 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1794 .policy = vport_policy, 1795 .doit = ovs_vport_cmd_set, 1796 }, 1797 }; 1798 1799 struct genl_family_and_ops { 1800 struct genl_family *family; 1801 struct genl_ops *ops; 1802 int n_ops; 1803 struct genl_multicast_group *group; 1804 }; 1805 1806 static const struct genl_family_and_ops dp_genl_families[] = { 1807 { &dp_datapath_genl_family, 1808 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops), 1809 &ovs_dp_datapath_multicast_group }, 1810 { &dp_vport_genl_family, 1811 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops), 1812 &ovs_dp_vport_multicast_group }, 1813 { &dp_flow_genl_family, 1814 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops), 1815 &ovs_dp_flow_multicast_group }, 1816 { &dp_packet_genl_family, 1817 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops), 1818 NULL }, 1819 }; 1820 1821 static void dp_unregister_genl(int n_families) 1822 { 1823 int i; 1824 1825 for (i = 0; i < n_families; i++) 1826 genl_unregister_family(dp_genl_families[i].family); 1827 } 1828 1829 static int dp_register_genl(void) 1830 { 1831 int n_registered; 1832 int err; 1833 int i; 1834 1835 n_registered = 0; 1836 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 1837 const struct genl_family_and_ops *f = &dp_genl_families[i]; 1838 1839 err = genl_register_family_with_ops(f->family, f->ops, 1840 f->n_ops); 1841 if (err) 1842 goto error; 1843 n_registered++; 1844 1845 if (f->group) { 1846 err = genl_register_mc_group(f->family, f->group); 1847 if (err) 1848 goto error; 1849 } 1850 } 1851 1852 return 0; 1853 1854 error: 1855 dp_unregister_genl(n_registered); 1856 return err; 1857 } 1858 1859 static int __init dp_init(void) 1860 { 1861 struct sk_buff *dummy_skb; 1862 int err; 1863 1864 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb)); 1865 1866 pr_info("Open vSwitch switching datapath\n"); 1867 1868 err = ovs_flow_init(); 1869 if (err) 1870 goto error; 1871 1872 err = ovs_vport_init(); 1873 if (err) 1874 goto error_flow_exit; 1875 1876 err = register_netdevice_notifier(&ovs_dp_device_notifier); 1877 if (err) 1878 goto error_vport_exit; 1879 1880 err = dp_register_genl(); 1881 if (err < 0) 1882 goto error_unreg_notifier; 1883 1884 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); 1885 1886 return 0; 1887 1888 error_unreg_notifier: 1889 unregister_netdevice_notifier(&ovs_dp_device_notifier); 1890 error_vport_exit: 1891 ovs_vport_exit(); 1892 error_flow_exit: 1893 ovs_flow_exit(); 1894 error: 1895 return err; 1896 } 1897 1898 static void dp_cleanup(void) 1899 { 1900 cancel_delayed_work_sync(&rehash_flow_wq); 1901 rcu_barrier(); 1902 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 1903 unregister_netdevice_notifier(&ovs_dp_device_notifier); 1904 ovs_vport_exit(); 1905 ovs_flow_exit(); 1906 } 1907 1908 module_init(dp_init); 1909 module_exit(dp_cleanup); 1910 1911 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 1912 MODULE_LICENSE("GPL"); 1913