1 /* 2 * Copyright (c) 2007-2011 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/version.h> 40 #include <linux/ethtool.h> 41 #include <linux/wait.h> 42 #include <asm/system.h> 43 #include <asm/div64.h> 44 #include <linux/highmem.h> 45 #include <linux/netfilter_bridge.h> 46 #include <linux/netfilter_ipv4.h> 47 #include <linux/inetdevice.h> 48 #include <linux/list.h> 49 #include <linux/openvswitch.h> 50 #include <linux/rculist.h> 51 #include <linux/dmi.h> 52 #include <linux/workqueue.h> 53 #include <net/genetlink.h> 54 55 #include "datapath.h" 56 #include "flow.h" 57 #include "vport-internal_dev.h" 58 59 /** 60 * DOC: Locking: 61 * 62 * Writes to device state (add/remove datapath, port, set operations on vports, 63 * etc.) are protected by RTNL. 64 * 65 * Writes to other state (flow table modifications, set miscellaneous datapath 66 * parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside 67 * genl_mutex. 68 * 69 * Reads are protected by RCU. 70 * 71 * There are a few special cases (mostly stats) that have their own 72 * synchronization but they nest under all of above and don't interact with 73 * each other. 74 */ 75 76 /* Global list of datapaths to enable dumping them all out. 77 * Protected by genl_mutex. 78 */ 79 static LIST_HEAD(dps); 80 81 #define REHASH_FLOW_INTERVAL (10 * 60 * HZ) 82 static void rehash_flow_table(struct work_struct *work); 83 static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table); 84 85 static struct vport *new_vport(const struct vport_parms *); 86 static int queue_gso_packets(int dp_ifindex, struct sk_buff *, 87 const struct dp_upcall_info *); 88 static int queue_userspace_packet(int dp_ifindex, struct sk_buff *, 89 const struct dp_upcall_info *); 90 91 /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */ 92 static struct datapath *get_dp(int dp_ifindex) 93 { 94 struct datapath *dp = NULL; 95 struct net_device *dev; 96 97 rcu_read_lock(); 98 dev = dev_get_by_index_rcu(&init_net, dp_ifindex); 99 if (dev) { 100 struct vport *vport = ovs_internal_dev_get_vport(dev); 101 if (vport) 102 dp = vport->dp; 103 } 104 rcu_read_unlock(); 105 106 return dp; 107 } 108 109 /* Must be called with rcu_read_lock or RTNL lock. */ 110 const char *ovs_dp_name(const struct datapath *dp) 111 { 112 struct vport *vport = rcu_dereference_rtnl(dp->ports[OVSP_LOCAL]); 113 return vport->ops->get_name(vport); 114 } 115 116 static int get_dpifindex(struct datapath *dp) 117 { 118 struct vport *local; 119 int ifindex; 120 121 rcu_read_lock(); 122 123 local = rcu_dereference(dp->ports[OVSP_LOCAL]); 124 if (local) 125 ifindex = local->ops->get_ifindex(local); 126 else 127 ifindex = 0; 128 129 rcu_read_unlock(); 130 131 return ifindex; 132 } 133 134 static void destroy_dp_rcu(struct rcu_head *rcu) 135 { 136 struct datapath *dp = container_of(rcu, struct datapath, rcu); 137 138 ovs_flow_tbl_destroy((__force struct flow_table *)dp->table); 139 free_percpu(dp->stats_percpu); 140 kfree(dp); 141 } 142 143 /* Called with RTNL lock and genl_lock. */ 144 static struct vport *new_vport(const struct vport_parms *parms) 145 { 146 struct vport *vport; 147 148 vport = ovs_vport_add(parms); 149 if (!IS_ERR(vport)) { 150 struct datapath *dp = parms->dp; 151 152 rcu_assign_pointer(dp->ports[parms->port_no], vport); 153 list_add(&vport->node, &dp->port_list); 154 } 155 156 return vport; 157 } 158 159 /* Called with RTNL lock. */ 160 void ovs_dp_detach_port(struct vport *p) 161 { 162 ASSERT_RTNL(); 163 164 /* First drop references to device. */ 165 list_del(&p->node); 166 rcu_assign_pointer(p->dp->ports[p->port_no], NULL); 167 168 /* Then destroy it. */ 169 ovs_vport_del(p); 170 } 171 172 /* Must be called with rcu_read_lock. */ 173 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb) 174 { 175 struct datapath *dp = p->dp; 176 struct sw_flow *flow; 177 struct dp_stats_percpu *stats; 178 struct sw_flow_key key; 179 u64 *stats_counter; 180 int error; 181 int key_len; 182 183 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id()); 184 185 /* Extract flow from 'skb' into 'key'. */ 186 error = ovs_flow_extract(skb, p->port_no, &key, &key_len); 187 if (unlikely(error)) { 188 kfree_skb(skb); 189 return; 190 } 191 192 /* Look up flow. */ 193 flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len); 194 if (unlikely(!flow)) { 195 struct dp_upcall_info upcall; 196 197 upcall.cmd = OVS_PACKET_CMD_MISS; 198 upcall.key = &key; 199 upcall.userdata = NULL; 200 upcall.pid = p->upcall_pid; 201 ovs_dp_upcall(dp, skb, &upcall); 202 consume_skb(skb); 203 stats_counter = &stats->n_missed; 204 goto out; 205 } 206 207 OVS_CB(skb)->flow = flow; 208 209 stats_counter = &stats->n_hit; 210 ovs_flow_used(OVS_CB(skb)->flow, skb); 211 ovs_execute_actions(dp, skb); 212 213 out: 214 /* Update datapath statistics. */ 215 u64_stats_update_begin(&stats->sync); 216 (*stats_counter)++; 217 u64_stats_update_end(&stats->sync); 218 } 219 220 static struct genl_family dp_packet_genl_family = { 221 .id = GENL_ID_GENERATE, 222 .hdrsize = sizeof(struct ovs_header), 223 .name = OVS_PACKET_FAMILY, 224 .version = OVS_PACKET_VERSION, 225 .maxattr = OVS_PACKET_ATTR_MAX 226 }; 227 228 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 229 const struct dp_upcall_info *upcall_info) 230 { 231 struct dp_stats_percpu *stats; 232 int dp_ifindex; 233 int err; 234 235 if (upcall_info->pid == 0) { 236 err = -ENOTCONN; 237 goto err; 238 } 239 240 dp_ifindex = get_dpifindex(dp); 241 if (!dp_ifindex) { 242 err = -ENODEV; 243 goto err; 244 } 245 246 if (!skb_is_gso(skb)) 247 err = queue_userspace_packet(dp_ifindex, skb, upcall_info); 248 else 249 err = queue_gso_packets(dp_ifindex, skb, upcall_info); 250 if (err) 251 goto err; 252 253 return 0; 254 255 err: 256 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id()); 257 258 u64_stats_update_begin(&stats->sync); 259 stats->n_lost++; 260 u64_stats_update_end(&stats->sync); 261 262 return err; 263 } 264 265 static int queue_gso_packets(int dp_ifindex, struct sk_buff *skb, 266 const struct dp_upcall_info *upcall_info) 267 { 268 struct dp_upcall_info later_info; 269 struct sw_flow_key later_key; 270 struct sk_buff *segs, *nskb; 271 int err; 272 273 segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM); 274 if (IS_ERR(skb)) 275 return PTR_ERR(skb); 276 277 /* Queue all of the segments. */ 278 skb = segs; 279 do { 280 err = queue_userspace_packet(dp_ifindex, skb, upcall_info); 281 if (err) 282 break; 283 284 if (skb == segs && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) { 285 /* The initial flow key extracted by ovs_flow_extract() 286 * in this case is for a first fragment, so we need to 287 * properly mark later fragments. 288 */ 289 later_key = *upcall_info->key; 290 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 291 292 later_info = *upcall_info; 293 later_info.key = &later_key; 294 upcall_info = &later_info; 295 } 296 } while ((skb = skb->next)); 297 298 /* Free all of the segments. */ 299 skb = segs; 300 do { 301 nskb = skb->next; 302 if (err) 303 kfree_skb(skb); 304 else 305 consume_skb(skb); 306 } while ((skb = nskb)); 307 return err; 308 } 309 310 static int queue_userspace_packet(int dp_ifindex, struct sk_buff *skb, 311 const struct dp_upcall_info *upcall_info) 312 { 313 struct ovs_header *upcall; 314 struct sk_buff *nskb = NULL; 315 struct sk_buff *user_skb; /* to be queued to userspace */ 316 struct nlattr *nla; 317 unsigned int len; 318 int err; 319 320 if (vlan_tx_tag_present(skb)) { 321 nskb = skb_clone(skb, GFP_ATOMIC); 322 if (!nskb) 323 return -ENOMEM; 324 325 nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb)); 326 if (!skb) 327 return -ENOMEM; 328 329 nskb->vlan_tci = 0; 330 skb = nskb; 331 } 332 333 if (nla_attr_size(skb->len) > USHRT_MAX) { 334 err = -EFBIG; 335 goto out; 336 } 337 338 len = sizeof(struct ovs_header); 339 len += nla_total_size(skb->len); 340 len += nla_total_size(FLOW_BUFSIZE); 341 if (upcall_info->cmd == OVS_PACKET_CMD_ACTION) 342 len += nla_total_size(8); 343 344 user_skb = genlmsg_new(len, GFP_ATOMIC); 345 if (!user_skb) { 346 err = -ENOMEM; 347 goto out; 348 } 349 350 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 351 0, upcall_info->cmd); 352 upcall->dp_ifindex = dp_ifindex; 353 354 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY); 355 ovs_flow_to_nlattrs(upcall_info->key, user_skb); 356 nla_nest_end(user_skb, nla); 357 358 if (upcall_info->userdata) 359 nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA, 360 nla_get_u64(upcall_info->userdata)); 361 362 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len); 363 364 skb_copy_and_csum_dev(skb, nla_data(nla)); 365 366 err = genlmsg_unicast(&init_net, user_skb, upcall_info->pid); 367 368 out: 369 kfree_skb(nskb); 370 return err; 371 } 372 373 /* Called with genl_mutex. */ 374 static int flush_flows(int dp_ifindex) 375 { 376 struct flow_table *old_table; 377 struct flow_table *new_table; 378 struct datapath *dp; 379 380 dp = get_dp(dp_ifindex); 381 if (!dp) 382 return -ENODEV; 383 384 old_table = genl_dereference(dp->table); 385 new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS); 386 if (!new_table) 387 return -ENOMEM; 388 389 rcu_assign_pointer(dp->table, new_table); 390 391 ovs_flow_tbl_deferred_destroy(old_table); 392 return 0; 393 } 394 395 static int validate_actions(const struct nlattr *attr, 396 const struct sw_flow_key *key, int depth); 397 398 static int validate_sample(const struct nlattr *attr, 399 const struct sw_flow_key *key, int depth) 400 { 401 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1]; 402 const struct nlattr *probability, *actions; 403 const struct nlattr *a; 404 int rem; 405 406 memset(attrs, 0, sizeof(attrs)); 407 nla_for_each_nested(a, attr, rem) { 408 int type = nla_type(a); 409 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type]) 410 return -EINVAL; 411 attrs[type] = a; 412 } 413 if (rem) 414 return -EINVAL; 415 416 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY]; 417 if (!probability || nla_len(probability) != sizeof(u32)) 418 return -EINVAL; 419 420 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS]; 421 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN)) 422 return -EINVAL; 423 return validate_actions(actions, key, depth + 1); 424 } 425 426 static int validate_set(const struct nlattr *a, 427 const struct sw_flow_key *flow_key) 428 { 429 const struct nlattr *ovs_key = nla_data(a); 430 int key_type = nla_type(ovs_key); 431 432 /* There can be only one key in a action */ 433 if (nla_total_size(nla_len(ovs_key)) != nla_len(a)) 434 return -EINVAL; 435 436 if (key_type > OVS_KEY_ATTR_MAX || 437 nla_len(ovs_key) != ovs_key_lens[key_type]) 438 return -EINVAL; 439 440 switch (key_type) { 441 const struct ovs_key_ipv4 *ipv4_key; 442 443 case OVS_KEY_ATTR_PRIORITY: 444 case OVS_KEY_ATTR_ETHERNET: 445 break; 446 447 case OVS_KEY_ATTR_IPV4: 448 if (flow_key->eth.type != htons(ETH_P_IP)) 449 return -EINVAL; 450 451 if (!flow_key->ipv4.addr.src || !flow_key->ipv4.addr.dst) 452 return -EINVAL; 453 454 ipv4_key = nla_data(ovs_key); 455 if (ipv4_key->ipv4_proto != flow_key->ip.proto) 456 return -EINVAL; 457 458 if (ipv4_key->ipv4_frag != flow_key->ip.frag) 459 return -EINVAL; 460 461 break; 462 463 case OVS_KEY_ATTR_TCP: 464 if (flow_key->ip.proto != IPPROTO_TCP) 465 return -EINVAL; 466 467 if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst) 468 return -EINVAL; 469 470 break; 471 472 case OVS_KEY_ATTR_UDP: 473 if (flow_key->ip.proto != IPPROTO_UDP) 474 return -EINVAL; 475 476 if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst) 477 return -EINVAL; 478 break; 479 480 default: 481 return -EINVAL; 482 } 483 484 return 0; 485 } 486 487 static int validate_userspace(const struct nlattr *attr) 488 { 489 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = { 490 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 }, 491 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 }, 492 }; 493 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1]; 494 int error; 495 496 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX, 497 attr, userspace_policy); 498 if (error) 499 return error; 500 501 if (!a[OVS_USERSPACE_ATTR_PID] || 502 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID])) 503 return -EINVAL; 504 505 return 0; 506 } 507 508 static int validate_actions(const struct nlattr *attr, 509 const struct sw_flow_key *key, int depth) 510 { 511 const struct nlattr *a; 512 int rem, err; 513 514 if (depth >= SAMPLE_ACTION_DEPTH) 515 return -EOVERFLOW; 516 517 nla_for_each_nested(a, attr, rem) { 518 /* Expected argument lengths, (u32)-1 for variable length. */ 519 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = { 520 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32), 521 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1, 522 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan), 523 [OVS_ACTION_ATTR_POP_VLAN] = 0, 524 [OVS_ACTION_ATTR_SET] = (u32)-1, 525 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1 526 }; 527 const struct ovs_action_push_vlan *vlan; 528 int type = nla_type(a); 529 530 if (type > OVS_ACTION_ATTR_MAX || 531 (action_lens[type] != nla_len(a) && 532 action_lens[type] != (u32)-1)) 533 return -EINVAL; 534 535 switch (type) { 536 case OVS_ACTION_ATTR_UNSPEC: 537 return -EINVAL; 538 539 case OVS_ACTION_ATTR_USERSPACE: 540 err = validate_userspace(a); 541 if (err) 542 return err; 543 break; 544 545 case OVS_ACTION_ATTR_OUTPUT: 546 if (nla_get_u32(a) >= DP_MAX_PORTS) 547 return -EINVAL; 548 break; 549 550 551 case OVS_ACTION_ATTR_POP_VLAN: 552 break; 553 554 case OVS_ACTION_ATTR_PUSH_VLAN: 555 vlan = nla_data(a); 556 if (vlan->vlan_tpid != htons(ETH_P_8021Q)) 557 return -EINVAL; 558 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT))) 559 return -EINVAL; 560 break; 561 562 case OVS_ACTION_ATTR_SET: 563 err = validate_set(a, key); 564 if (err) 565 return err; 566 break; 567 568 case OVS_ACTION_ATTR_SAMPLE: 569 err = validate_sample(a, key, depth); 570 if (err) 571 return err; 572 break; 573 574 default: 575 return -EINVAL; 576 } 577 } 578 579 if (rem > 0) 580 return -EINVAL; 581 582 return 0; 583 } 584 585 static void clear_stats(struct sw_flow *flow) 586 { 587 flow->used = 0; 588 flow->tcp_flags = 0; 589 flow->packet_count = 0; 590 flow->byte_count = 0; 591 } 592 593 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 594 { 595 struct ovs_header *ovs_header = info->userhdr; 596 struct nlattr **a = info->attrs; 597 struct sw_flow_actions *acts; 598 struct sk_buff *packet; 599 struct sw_flow *flow; 600 struct datapath *dp; 601 struct ethhdr *eth; 602 int len; 603 int err; 604 int key_len; 605 606 err = -EINVAL; 607 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 608 !a[OVS_PACKET_ATTR_ACTIONS] || 609 nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN) 610 goto err; 611 612 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 613 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 614 err = -ENOMEM; 615 if (!packet) 616 goto err; 617 skb_reserve(packet, NET_IP_ALIGN); 618 619 memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len); 620 621 skb_reset_mac_header(packet); 622 eth = eth_hdr(packet); 623 624 /* Normally, setting the skb 'protocol' field would be handled by a 625 * call to eth_type_trans(), but it assumes there's a sending 626 * device, which we may not have. */ 627 if (ntohs(eth->h_proto) >= 1536) 628 packet->protocol = eth->h_proto; 629 else 630 packet->protocol = htons(ETH_P_802_2); 631 632 /* Build an sw_flow for sending this packet. */ 633 flow = ovs_flow_alloc(); 634 err = PTR_ERR(flow); 635 if (IS_ERR(flow)) 636 goto err_kfree_skb; 637 638 err = ovs_flow_extract(packet, -1, &flow->key, &key_len); 639 if (err) 640 goto err_flow_free; 641 642 err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority, 643 &flow->key.phy.in_port, 644 a[OVS_PACKET_ATTR_KEY]); 645 if (err) 646 goto err_flow_free; 647 648 err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0); 649 if (err) 650 goto err_flow_free; 651 652 flow->hash = ovs_flow_hash(&flow->key, key_len); 653 654 acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]); 655 err = PTR_ERR(acts); 656 if (IS_ERR(acts)) 657 goto err_flow_free; 658 rcu_assign_pointer(flow->sf_acts, acts); 659 660 OVS_CB(packet)->flow = flow; 661 packet->priority = flow->key.phy.priority; 662 663 rcu_read_lock(); 664 dp = get_dp(ovs_header->dp_ifindex); 665 err = -ENODEV; 666 if (!dp) 667 goto err_unlock; 668 669 local_bh_disable(); 670 err = ovs_execute_actions(dp, packet); 671 local_bh_enable(); 672 rcu_read_unlock(); 673 674 ovs_flow_free(flow); 675 return err; 676 677 err_unlock: 678 rcu_read_unlock(); 679 err_flow_free: 680 ovs_flow_free(flow); 681 err_kfree_skb: 682 kfree_skb(packet); 683 err: 684 return err; 685 } 686 687 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 688 [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC }, 689 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 690 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 691 }; 692 693 static struct genl_ops dp_packet_genl_ops[] = { 694 { .cmd = OVS_PACKET_CMD_EXECUTE, 695 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 696 .policy = packet_policy, 697 .doit = ovs_packet_cmd_execute 698 } 699 }; 700 701 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats) 702 { 703 int i; 704 struct flow_table *table = genl_dereference(dp->table); 705 706 stats->n_flows = ovs_flow_tbl_count(table); 707 708 stats->n_hit = stats->n_missed = stats->n_lost = 0; 709 for_each_possible_cpu(i) { 710 const struct dp_stats_percpu *percpu_stats; 711 struct dp_stats_percpu local_stats; 712 unsigned int start; 713 714 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 715 716 do { 717 start = u64_stats_fetch_begin_bh(&percpu_stats->sync); 718 local_stats = *percpu_stats; 719 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start)); 720 721 stats->n_hit += local_stats.n_hit; 722 stats->n_missed += local_stats.n_missed; 723 stats->n_lost += local_stats.n_lost; 724 } 725 } 726 727 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 728 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 729 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 730 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 731 }; 732 733 static struct genl_family dp_flow_genl_family = { 734 .id = GENL_ID_GENERATE, 735 .hdrsize = sizeof(struct ovs_header), 736 .name = OVS_FLOW_FAMILY, 737 .version = OVS_FLOW_VERSION, 738 .maxattr = OVS_FLOW_ATTR_MAX 739 }; 740 741 static struct genl_multicast_group ovs_dp_flow_multicast_group = { 742 .name = OVS_FLOW_MCGROUP 743 }; 744 745 /* Called with genl_lock. */ 746 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp, 747 struct sk_buff *skb, u32 pid, 748 u32 seq, u32 flags, u8 cmd) 749 { 750 const int skb_orig_len = skb->len; 751 const struct sw_flow_actions *sf_acts; 752 struct ovs_flow_stats stats; 753 struct ovs_header *ovs_header; 754 struct nlattr *nla; 755 unsigned long used; 756 u8 tcp_flags; 757 int err; 758 759 sf_acts = rcu_dereference_protected(flow->sf_acts, 760 lockdep_genl_is_held()); 761 762 ovs_header = genlmsg_put(skb, pid, seq, &dp_flow_genl_family, flags, cmd); 763 if (!ovs_header) 764 return -EMSGSIZE; 765 766 ovs_header->dp_ifindex = get_dpifindex(dp); 767 768 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY); 769 if (!nla) 770 goto nla_put_failure; 771 err = ovs_flow_to_nlattrs(&flow->key, skb); 772 if (err) 773 goto error; 774 nla_nest_end(skb, nla); 775 776 spin_lock_bh(&flow->lock); 777 used = flow->used; 778 stats.n_packets = flow->packet_count; 779 stats.n_bytes = flow->byte_count; 780 tcp_flags = flow->tcp_flags; 781 spin_unlock_bh(&flow->lock); 782 783 if (used) 784 NLA_PUT_U64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)); 785 786 if (stats.n_packets) 787 NLA_PUT(skb, OVS_FLOW_ATTR_STATS, 788 sizeof(struct ovs_flow_stats), &stats); 789 790 if (tcp_flags) 791 NLA_PUT_U8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags); 792 793 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 794 * this is the first flow to be dumped into 'skb'. This is unusual for 795 * Netlink but individual action lists can be longer than 796 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 797 * The userspace caller can always fetch the actions separately if it 798 * really wants them. (Most userspace callers in fact don't care.) 799 * 800 * This can only fail for dump operations because the skb is always 801 * properly sized for single flows. 802 */ 803 err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len, 804 sf_acts->actions); 805 if (err < 0 && skb_orig_len) 806 goto error; 807 808 return genlmsg_end(skb, ovs_header); 809 810 nla_put_failure: 811 err = -EMSGSIZE; 812 error: 813 genlmsg_cancel(skb, ovs_header); 814 return err; 815 } 816 817 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow) 818 { 819 const struct sw_flow_actions *sf_acts; 820 int len; 821 822 sf_acts = rcu_dereference_protected(flow->sf_acts, 823 lockdep_genl_is_held()); 824 825 /* OVS_FLOW_ATTR_KEY */ 826 len = nla_total_size(FLOW_BUFSIZE); 827 /* OVS_FLOW_ATTR_ACTIONS */ 828 len += nla_total_size(sf_acts->actions_len); 829 /* OVS_FLOW_ATTR_STATS */ 830 len += nla_total_size(sizeof(struct ovs_flow_stats)); 831 /* OVS_FLOW_ATTR_TCP_FLAGS */ 832 len += nla_total_size(1); 833 /* OVS_FLOW_ATTR_USED */ 834 len += nla_total_size(8); 835 836 len += NLMSG_ALIGN(sizeof(struct ovs_header)); 837 838 return genlmsg_new(len, GFP_KERNEL); 839 } 840 841 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow, 842 struct datapath *dp, 843 u32 pid, u32 seq, u8 cmd) 844 { 845 struct sk_buff *skb; 846 int retval; 847 848 skb = ovs_flow_cmd_alloc_info(flow); 849 if (!skb) 850 return ERR_PTR(-ENOMEM); 851 852 retval = ovs_flow_cmd_fill_info(flow, dp, skb, pid, seq, 0, cmd); 853 BUG_ON(retval < 0); 854 return skb; 855 } 856 857 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info) 858 { 859 struct nlattr **a = info->attrs; 860 struct ovs_header *ovs_header = info->userhdr; 861 struct sw_flow_key key; 862 struct sw_flow *flow; 863 struct sk_buff *reply; 864 struct datapath *dp; 865 struct flow_table *table; 866 int error; 867 int key_len; 868 869 /* Extract key. */ 870 error = -EINVAL; 871 if (!a[OVS_FLOW_ATTR_KEY]) 872 goto error; 873 error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); 874 if (error) 875 goto error; 876 877 /* Validate actions. */ 878 if (a[OVS_FLOW_ATTR_ACTIONS]) { 879 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0); 880 if (error) 881 goto error; 882 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) { 883 error = -EINVAL; 884 goto error; 885 } 886 887 dp = get_dp(ovs_header->dp_ifindex); 888 error = -ENODEV; 889 if (!dp) 890 goto error; 891 892 table = genl_dereference(dp->table); 893 flow = ovs_flow_tbl_lookup(table, &key, key_len); 894 if (!flow) { 895 struct sw_flow_actions *acts; 896 897 /* Bail out if we're not allowed to create a new flow. */ 898 error = -ENOENT; 899 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET) 900 goto error; 901 902 /* Expand table, if necessary, to make room. */ 903 if (ovs_flow_tbl_need_to_expand(table)) { 904 struct flow_table *new_table; 905 906 new_table = ovs_flow_tbl_expand(table); 907 if (!IS_ERR(new_table)) { 908 rcu_assign_pointer(dp->table, new_table); 909 ovs_flow_tbl_deferred_destroy(table); 910 table = genl_dereference(dp->table); 911 } 912 } 913 914 /* Allocate flow. */ 915 flow = ovs_flow_alloc(); 916 if (IS_ERR(flow)) { 917 error = PTR_ERR(flow); 918 goto error; 919 } 920 flow->key = key; 921 clear_stats(flow); 922 923 /* Obtain actions. */ 924 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]); 925 error = PTR_ERR(acts); 926 if (IS_ERR(acts)) 927 goto error_free_flow; 928 rcu_assign_pointer(flow->sf_acts, acts); 929 930 /* Put flow in bucket. */ 931 flow->hash = ovs_flow_hash(&key, key_len); 932 ovs_flow_tbl_insert(table, flow); 933 934 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid, 935 info->snd_seq, 936 OVS_FLOW_CMD_NEW); 937 } else { 938 /* We found a matching flow. */ 939 struct sw_flow_actions *old_acts; 940 struct nlattr *acts_attrs; 941 942 /* Bail out if we're not allowed to modify an existing flow. 943 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 944 * because Generic Netlink treats the latter as a dump 945 * request. We also accept NLM_F_EXCL in case that bug ever 946 * gets fixed. 947 */ 948 error = -EEXIST; 949 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW && 950 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL)) 951 goto error; 952 953 /* Update actions. */ 954 old_acts = rcu_dereference_protected(flow->sf_acts, 955 lockdep_genl_is_held()); 956 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS]; 957 if (acts_attrs && 958 (old_acts->actions_len != nla_len(acts_attrs) || 959 memcmp(old_acts->actions, nla_data(acts_attrs), 960 old_acts->actions_len))) { 961 struct sw_flow_actions *new_acts; 962 963 new_acts = ovs_flow_actions_alloc(acts_attrs); 964 error = PTR_ERR(new_acts); 965 if (IS_ERR(new_acts)) 966 goto error; 967 968 rcu_assign_pointer(flow->sf_acts, new_acts); 969 ovs_flow_deferred_free_acts(old_acts); 970 } 971 972 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid, 973 info->snd_seq, OVS_FLOW_CMD_NEW); 974 975 /* Clear stats. */ 976 if (a[OVS_FLOW_ATTR_CLEAR]) { 977 spin_lock_bh(&flow->lock); 978 clear_stats(flow); 979 spin_unlock_bh(&flow->lock); 980 } 981 } 982 983 if (!IS_ERR(reply)) 984 genl_notify(reply, genl_info_net(info), info->snd_pid, 985 ovs_dp_flow_multicast_group.id, info->nlhdr, 986 GFP_KERNEL); 987 else 988 netlink_set_err(init_net.genl_sock, 0, 989 ovs_dp_flow_multicast_group.id, PTR_ERR(reply)); 990 return 0; 991 992 error_free_flow: 993 ovs_flow_free(flow); 994 error: 995 return error; 996 } 997 998 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 999 { 1000 struct nlattr **a = info->attrs; 1001 struct ovs_header *ovs_header = info->userhdr; 1002 struct sw_flow_key key; 1003 struct sk_buff *reply; 1004 struct sw_flow *flow; 1005 struct datapath *dp; 1006 struct flow_table *table; 1007 int err; 1008 int key_len; 1009 1010 if (!a[OVS_FLOW_ATTR_KEY]) 1011 return -EINVAL; 1012 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); 1013 if (err) 1014 return err; 1015 1016 dp = get_dp(ovs_header->dp_ifindex); 1017 if (!dp) 1018 return -ENODEV; 1019 1020 table = genl_dereference(dp->table); 1021 flow = ovs_flow_tbl_lookup(table, &key, key_len); 1022 if (!flow) 1023 return -ENOENT; 1024 1025 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid, 1026 info->snd_seq, OVS_FLOW_CMD_NEW); 1027 if (IS_ERR(reply)) 1028 return PTR_ERR(reply); 1029 1030 return genlmsg_reply(reply, info); 1031 } 1032 1033 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1034 { 1035 struct nlattr **a = info->attrs; 1036 struct ovs_header *ovs_header = info->userhdr; 1037 struct sw_flow_key key; 1038 struct sk_buff *reply; 1039 struct sw_flow *flow; 1040 struct datapath *dp; 1041 struct flow_table *table; 1042 int err; 1043 int key_len; 1044 1045 if (!a[OVS_FLOW_ATTR_KEY]) 1046 return flush_flows(ovs_header->dp_ifindex); 1047 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); 1048 if (err) 1049 return err; 1050 1051 dp = get_dp(ovs_header->dp_ifindex); 1052 if (!dp) 1053 return -ENODEV; 1054 1055 table = genl_dereference(dp->table); 1056 flow = ovs_flow_tbl_lookup(table, &key, key_len); 1057 if (!flow) 1058 return -ENOENT; 1059 1060 reply = ovs_flow_cmd_alloc_info(flow); 1061 if (!reply) 1062 return -ENOMEM; 1063 1064 ovs_flow_tbl_remove(table, flow); 1065 1066 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_pid, 1067 info->snd_seq, 0, OVS_FLOW_CMD_DEL); 1068 BUG_ON(err < 0); 1069 1070 ovs_flow_deferred_free(flow); 1071 1072 genl_notify(reply, genl_info_net(info), info->snd_pid, 1073 ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL); 1074 return 0; 1075 } 1076 1077 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1078 { 1079 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1080 struct datapath *dp; 1081 struct flow_table *table; 1082 1083 dp = get_dp(ovs_header->dp_ifindex); 1084 if (!dp) 1085 return -ENODEV; 1086 1087 table = genl_dereference(dp->table); 1088 1089 for (;;) { 1090 struct sw_flow *flow; 1091 u32 bucket, obj; 1092 1093 bucket = cb->args[0]; 1094 obj = cb->args[1]; 1095 flow = ovs_flow_tbl_next(table, &bucket, &obj); 1096 if (!flow) 1097 break; 1098 1099 if (ovs_flow_cmd_fill_info(flow, dp, skb, 1100 NETLINK_CB(cb->skb).pid, 1101 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1102 OVS_FLOW_CMD_NEW) < 0) 1103 break; 1104 1105 cb->args[0] = bucket; 1106 cb->args[1] = obj; 1107 } 1108 return skb->len; 1109 } 1110 1111 static struct genl_ops dp_flow_genl_ops[] = { 1112 { .cmd = OVS_FLOW_CMD_NEW, 1113 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1114 .policy = flow_policy, 1115 .doit = ovs_flow_cmd_new_or_set 1116 }, 1117 { .cmd = OVS_FLOW_CMD_DEL, 1118 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1119 .policy = flow_policy, 1120 .doit = ovs_flow_cmd_del 1121 }, 1122 { .cmd = OVS_FLOW_CMD_GET, 1123 .flags = 0, /* OK for unprivileged users. */ 1124 .policy = flow_policy, 1125 .doit = ovs_flow_cmd_get, 1126 .dumpit = ovs_flow_cmd_dump 1127 }, 1128 { .cmd = OVS_FLOW_CMD_SET, 1129 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1130 .policy = flow_policy, 1131 .doit = ovs_flow_cmd_new_or_set, 1132 }, 1133 }; 1134 1135 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1136 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1137 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1138 }; 1139 1140 static struct genl_family dp_datapath_genl_family = { 1141 .id = GENL_ID_GENERATE, 1142 .hdrsize = sizeof(struct ovs_header), 1143 .name = OVS_DATAPATH_FAMILY, 1144 .version = OVS_DATAPATH_VERSION, 1145 .maxattr = OVS_DP_ATTR_MAX 1146 }; 1147 1148 static struct genl_multicast_group ovs_dp_datapath_multicast_group = { 1149 .name = OVS_DATAPATH_MCGROUP 1150 }; 1151 1152 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1153 u32 pid, u32 seq, u32 flags, u8 cmd) 1154 { 1155 struct ovs_header *ovs_header; 1156 struct ovs_dp_stats dp_stats; 1157 int err; 1158 1159 ovs_header = genlmsg_put(skb, pid, seq, &dp_datapath_genl_family, 1160 flags, cmd); 1161 if (!ovs_header) 1162 goto error; 1163 1164 ovs_header->dp_ifindex = get_dpifindex(dp); 1165 1166 rcu_read_lock(); 1167 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1168 rcu_read_unlock(); 1169 if (err) 1170 goto nla_put_failure; 1171 1172 get_dp_stats(dp, &dp_stats); 1173 NLA_PUT(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats); 1174 1175 return genlmsg_end(skb, ovs_header); 1176 1177 nla_put_failure: 1178 genlmsg_cancel(skb, ovs_header); 1179 error: 1180 return -EMSGSIZE; 1181 } 1182 1183 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 pid, 1184 u32 seq, u8 cmd) 1185 { 1186 struct sk_buff *skb; 1187 int retval; 1188 1189 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1190 if (!skb) 1191 return ERR_PTR(-ENOMEM); 1192 1193 retval = ovs_dp_cmd_fill_info(dp, skb, pid, seq, 0, cmd); 1194 if (retval < 0) { 1195 kfree_skb(skb); 1196 return ERR_PTR(retval); 1197 } 1198 return skb; 1199 } 1200 1201 /* Called with genl_mutex and optionally with RTNL lock also. */ 1202 static struct datapath *lookup_datapath(struct ovs_header *ovs_header, 1203 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1204 { 1205 struct datapath *dp; 1206 1207 if (!a[OVS_DP_ATTR_NAME]) 1208 dp = get_dp(ovs_header->dp_ifindex); 1209 else { 1210 struct vport *vport; 1211 1212 rcu_read_lock(); 1213 vport = ovs_vport_locate(nla_data(a[OVS_DP_ATTR_NAME])); 1214 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1215 rcu_read_unlock(); 1216 } 1217 return dp ? dp : ERR_PTR(-ENODEV); 1218 } 1219 1220 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1221 { 1222 struct nlattr **a = info->attrs; 1223 struct vport_parms parms; 1224 struct sk_buff *reply; 1225 struct datapath *dp; 1226 struct vport *vport; 1227 int err; 1228 1229 err = -EINVAL; 1230 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1231 goto err; 1232 1233 rtnl_lock(); 1234 err = -ENODEV; 1235 if (!try_module_get(THIS_MODULE)) 1236 goto err_unlock_rtnl; 1237 1238 err = -ENOMEM; 1239 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1240 if (dp == NULL) 1241 goto err_put_module; 1242 INIT_LIST_HEAD(&dp->port_list); 1243 1244 /* Allocate table. */ 1245 err = -ENOMEM; 1246 rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS)); 1247 if (!dp->table) 1248 goto err_free_dp; 1249 1250 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu); 1251 if (!dp->stats_percpu) { 1252 err = -ENOMEM; 1253 goto err_destroy_table; 1254 } 1255 1256 /* Set up our datapath device. */ 1257 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1258 parms.type = OVS_VPORT_TYPE_INTERNAL; 1259 parms.options = NULL; 1260 parms.dp = dp; 1261 parms.port_no = OVSP_LOCAL; 1262 parms.upcall_pid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]); 1263 1264 vport = new_vport(&parms); 1265 if (IS_ERR(vport)) { 1266 err = PTR_ERR(vport); 1267 if (err == -EBUSY) 1268 err = -EEXIST; 1269 1270 goto err_destroy_percpu; 1271 } 1272 1273 reply = ovs_dp_cmd_build_info(dp, info->snd_pid, 1274 info->snd_seq, OVS_DP_CMD_NEW); 1275 err = PTR_ERR(reply); 1276 if (IS_ERR(reply)) 1277 goto err_destroy_local_port; 1278 1279 list_add_tail(&dp->list_node, &dps); 1280 rtnl_unlock(); 1281 1282 genl_notify(reply, genl_info_net(info), info->snd_pid, 1283 ovs_dp_datapath_multicast_group.id, info->nlhdr, 1284 GFP_KERNEL); 1285 return 0; 1286 1287 err_destroy_local_port: 1288 ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL])); 1289 err_destroy_percpu: 1290 free_percpu(dp->stats_percpu); 1291 err_destroy_table: 1292 ovs_flow_tbl_destroy(genl_dereference(dp->table)); 1293 err_free_dp: 1294 kfree(dp); 1295 err_put_module: 1296 module_put(THIS_MODULE); 1297 err_unlock_rtnl: 1298 rtnl_unlock(); 1299 err: 1300 return err; 1301 } 1302 1303 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1304 { 1305 struct vport *vport, *next_vport; 1306 struct sk_buff *reply; 1307 struct datapath *dp; 1308 int err; 1309 1310 rtnl_lock(); 1311 dp = lookup_datapath(info->userhdr, info->attrs); 1312 err = PTR_ERR(dp); 1313 if (IS_ERR(dp)) 1314 goto exit_unlock; 1315 1316 reply = ovs_dp_cmd_build_info(dp, info->snd_pid, 1317 info->snd_seq, OVS_DP_CMD_DEL); 1318 err = PTR_ERR(reply); 1319 if (IS_ERR(reply)) 1320 goto exit_unlock; 1321 1322 list_for_each_entry_safe(vport, next_vport, &dp->port_list, node) 1323 if (vport->port_no != OVSP_LOCAL) 1324 ovs_dp_detach_port(vport); 1325 1326 list_del(&dp->list_node); 1327 ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL])); 1328 1329 /* rtnl_unlock() will wait until all the references to devices that 1330 * are pending unregistration have been dropped. We do it here to 1331 * ensure that any internal devices (which contain DP pointers) are 1332 * fully destroyed before freeing the datapath. 1333 */ 1334 rtnl_unlock(); 1335 1336 call_rcu(&dp->rcu, destroy_dp_rcu); 1337 module_put(THIS_MODULE); 1338 1339 genl_notify(reply, genl_info_net(info), info->snd_pid, 1340 ovs_dp_datapath_multicast_group.id, info->nlhdr, 1341 GFP_KERNEL); 1342 1343 return 0; 1344 1345 exit_unlock: 1346 rtnl_unlock(); 1347 return err; 1348 } 1349 1350 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1351 { 1352 struct sk_buff *reply; 1353 struct datapath *dp; 1354 int err; 1355 1356 dp = lookup_datapath(info->userhdr, info->attrs); 1357 if (IS_ERR(dp)) 1358 return PTR_ERR(dp); 1359 1360 reply = ovs_dp_cmd_build_info(dp, info->snd_pid, 1361 info->snd_seq, OVS_DP_CMD_NEW); 1362 if (IS_ERR(reply)) { 1363 err = PTR_ERR(reply); 1364 netlink_set_err(init_net.genl_sock, 0, 1365 ovs_dp_datapath_multicast_group.id, err); 1366 return 0; 1367 } 1368 1369 genl_notify(reply, genl_info_net(info), info->snd_pid, 1370 ovs_dp_datapath_multicast_group.id, info->nlhdr, 1371 GFP_KERNEL); 1372 1373 return 0; 1374 } 1375 1376 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1377 { 1378 struct sk_buff *reply; 1379 struct datapath *dp; 1380 1381 dp = lookup_datapath(info->userhdr, info->attrs); 1382 if (IS_ERR(dp)) 1383 return PTR_ERR(dp); 1384 1385 reply = ovs_dp_cmd_build_info(dp, info->snd_pid, 1386 info->snd_seq, OVS_DP_CMD_NEW); 1387 if (IS_ERR(reply)) 1388 return PTR_ERR(reply); 1389 1390 return genlmsg_reply(reply, info); 1391 } 1392 1393 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1394 { 1395 struct datapath *dp; 1396 int skip = cb->args[0]; 1397 int i = 0; 1398 1399 list_for_each_entry(dp, &dps, list_node) { 1400 if (i < skip) 1401 continue; 1402 if (ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid, 1403 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1404 OVS_DP_CMD_NEW) < 0) 1405 break; 1406 i++; 1407 } 1408 1409 cb->args[0] = i; 1410 1411 return skb->len; 1412 } 1413 1414 static struct genl_ops dp_datapath_genl_ops[] = { 1415 { .cmd = OVS_DP_CMD_NEW, 1416 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1417 .policy = datapath_policy, 1418 .doit = ovs_dp_cmd_new 1419 }, 1420 { .cmd = OVS_DP_CMD_DEL, 1421 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1422 .policy = datapath_policy, 1423 .doit = ovs_dp_cmd_del 1424 }, 1425 { .cmd = OVS_DP_CMD_GET, 1426 .flags = 0, /* OK for unprivileged users. */ 1427 .policy = datapath_policy, 1428 .doit = ovs_dp_cmd_get, 1429 .dumpit = ovs_dp_cmd_dump 1430 }, 1431 { .cmd = OVS_DP_CMD_SET, 1432 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1433 .policy = datapath_policy, 1434 .doit = ovs_dp_cmd_set, 1435 }, 1436 }; 1437 1438 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 1439 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1440 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 1441 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 1442 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 1443 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1444 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 1445 }; 1446 1447 static struct genl_family dp_vport_genl_family = { 1448 .id = GENL_ID_GENERATE, 1449 .hdrsize = sizeof(struct ovs_header), 1450 .name = OVS_VPORT_FAMILY, 1451 .version = OVS_VPORT_VERSION, 1452 .maxattr = OVS_VPORT_ATTR_MAX 1453 }; 1454 1455 struct genl_multicast_group ovs_dp_vport_multicast_group = { 1456 .name = OVS_VPORT_MCGROUP 1457 }; 1458 1459 /* Called with RTNL lock or RCU read lock. */ 1460 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1461 u32 pid, u32 seq, u32 flags, u8 cmd) 1462 { 1463 struct ovs_header *ovs_header; 1464 struct ovs_vport_stats vport_stats; 1465 int err; 1466 1467 ovs_header = genlmsg_put(skb, pid, seq, &dp_vport_genl_family, 1468 flags, cmd); 1469 if (!ovs_header) 1470 return -EMSGSIZE; 1471 1472 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1473 1474 NLA_PUT_U32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no); 1475 NLA_PUT_U32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type); 1476 NLA_PUT_STRING(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)); 1477 NLA_PUT_U32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_pid); 1478 1479 ovs_vport_get_stats(vport, &vport_stats); 1480 NLA_PUT(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), 1481 &vport_stats); 1482 1483 err = ovs_vport_get_options(vport, skb); 1484 if (err == -EMSGSIZE) 1485 goto error; 1486 1487 return genlmsg_end(skb, ovs_header); 1488 1489 nla_put_failure: 1490 err = -EMSGSIZE; 1491 error: 1492 genlmsg_cancel(skb, ovs_header); 1493 return err; 1494 } 1495 1496 /* Called with RTNL lock or RCU read lock. */ 1497 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 pid, 1498 u32 seq, u8 cmd) 1499 { 1500 struct sk_buff *skb; 1501 int retval; 1502 1503 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1504 if (!skb) 1505 return ERR_PTR(-ENOMEM); 1506 1507 retval = ovs_vport_cmd_fill_info(vport, skb, pid, seq, 0, cmd); 1508 if (retval < 0) { 1509 kfree_skb(skb); 1510 return ERR_PTR(retval); 1511 } 1512 return skb; 1513 } 1514 1515 /* Called with RTNL lock or RCU read lock. */ 1516 static struct vport *lookup_vport(struct ovs_header *ovs_header, 1517 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1518 { 1519 struct datapath *dp; 1520 struct vport *vport; 1521 1522 if (a[OVS_VPORT_ATTR_NAME]) { 1523 vport = ovs_vport_locate(nla_data(a[OVS_VPORT_ATTR_NAME])); 1524 if (!vport) 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