1 /* 2 * Copyright (c) 2007-2013 Nicira, Inc. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of version 2 of the GNU General Public 6 * License as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 * General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program; if not, write to the Free Software 15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 16 * 02110-1301, USA 17 */ 18 19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 20 21 #include <linux/init.h> 22 #include <linux/module.h> 23 #include <linux/if_arp.h> 24 #include <linux/if_vlan.h> 25 #include <linux/in.h> 26 #include <linux/ip.h> 27 #include <linux/jhash.h> 28 #include <linux/delay.h> 29 #include <linux/time.h> 30 #include <linux/etherdevice.h> 31 #include <linux/genetlink.h> 32 #include <linux/kernel.h> 33 #include <linux/kthread.h> 34 #include <linux/mutex.h> 35 #include <linux/percpu.h> 36 #include <linux/rcupdate.h> 37 #include <linux/tcp.h> 38 #include <linux/udp.h> 39 #include <linux/ethtool.h> 40 #include <linux/wait.h> 41 #include <asm/div64.h> 42 #include <linux/highmem.h> 43 #include <linux/netfilter_bridge.h> 44 #include <linux/netfilter_ipv4.h> 45 #include <linux/inetdevice.h> 46 #include <linux/list.h> 47 #include <linux/lockdep.h> 48 #include <linux/openvswitch.h> 49 #include <linux/rculist.h> 50 #include <linux/dmi.h> 51 #include <linux/workqueue.h> 52 #include <net/genetlink.h> 53 #include <net/net_namespace.h> 54 #include <net/netns/generic.h> 55 56 #include "datapath.h" 57 #include "flow.h" 58 #include "flow_netlink.h" 59 #include "vport-internal_dev.h" 60 #include "vport-netdev.h" 61 62 int ovs_net_id __read_mostly; 63 64 static void ovs_notify(struct sk_buff *skb, struct genl_info *info, 65 struct genl_multicast_group *grp) 66 { 67 genl_notify(skb, genl_info_net(info), info->snd_portid, 68 grp->id, info->nlhdr, GFP_KERNEL); 69 } 70 71 /** 72 * DOC: Locking: 73 * 74 * All writes e.g. Writes to device state (add/remove datapath, port, set 75 * operations on vports, etc.), Writes to other state (flow table 76 * modifications, set miscellaneous datapath parameters, etc.) are protected 77 * by ovs_lock. 78 * 79 * Reads are protected by RCU. 80 * 81 * There are a few special cases (mostly stats) that have their own 82 * synchronization but they nest under all of above and don't interact with 83 * each other. 84 * 85 * The RTNL lock nests inside ovs_mutex. 86 */ 87 88 static DEFINE_MUTEX(ovs_mutex); 89 90 void ovs_lock(void) 91 { 92 mutex_lock(&ovs_mutex); 93 } 94 95 void ovs_unlock(void) 96 { 97 mutex_unlock(&ovs_mutex); 98 } 99 100 #ifdef CONFIG_LOCKDEP 101 int lockdep_ovsl_is_held(void) 102 { 103 if (debug_locks) 104 return lockdep_is_held(&ovs_mutex); 105 else 106 return 1; 107 } 108 #endif 109 110 static struct vport *new_vport(const struct vport_parms *); 111 static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *, 112 const struct dp_upcall_info *); 113 static int queue_userspace_packet(struct net *, int dp_ifindex, 114 struct sk_buff *, 115 const struct dp_upcall_info *); 116 117 /* Must be called with rcu_read_lock or ovs_mutex. */ 118 static struct datapath *get_dp(struct net *net, int dp_ifindex) 119 { 120 struct datapath *dp = NULL; 121 struct net_device *dev; 122 123 rcu_read_lock(); 124 dev = dev_get_by_index_rcu(net, dp_ifindex); 125 if (dev) { 126 struct vport *vport = ovs_internal_dev_get_vport(dev); 127 if (vport) 128 dp = vport->dp; 129 } 130 rcu_read_unlock(); 131 132 return dp; 133 } 134 135 /* Must be called with rcu_read_lock or ovs_mutex. */ 136 const char *ovs_dp_name(const struct datapath *dp) 137 { 138 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); 139 return vport->ops->get_name(vport); 140 } 141 142 static int get_dpifindex(struct datapath *dp) 143 { 144 struct vport *local; 145 int ifindex; 146 147 rcu_read_lock(); 148 149 local = ovs_vport_rcu(dp, OVSP_LOCAL); 150 if (local) 151 ifindex = netdev_vport_priv(local)->dev->ifindex; 152 else 153 ifindex = 0; 154 155 rcu_read_unlock(); 156 157 return ifindex; 158 } 159 160 static void destroy_dp_rcu(struct rcu_head *rcu) 161 { 162 struct datapath *dp = container_of(rcu, struct datapath, rcu); 163 164 ovs_flow_tbl_destroy(&dp->table, false); 165 free_percpu(dp->stats_percpu); 166 release_net(ovs_dp_get_net(dp)); 167 kfree(dp->ports); 168 kfree(dp); 169 } 170 171 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 172 u16 port_no) 173 { 174 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 175 } 176 177 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 178 { 179 struct vport *vport; 180 struct hlist_head *head; 181 182 head = vport_hash_bucket(dp, port_no); 183 hlist_for_each_entry_rcu(vport, head, dp_hash_node) { 184 if (vport->port_no == port_no) 185 return vport; 186 } 187 return NULL; 188 } 189 190 /* Called with ovs_mutex. */ 191 static struct vport *new_vport(const struct vport_parms *parms) 192 { 193 struct vport *vport; 194 195 vport = ovs_vport_add(parms); 196 if (!IS_ERR(vport)) { 197 struct datapath *dp = parms->dp; 198 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 199 200 hlist_add_head_rcu(&vport->dp_hash_node, head); 201 } 202 return vport; 203 } 204 205 void ovs_dp_detach_port(struct vport *p) 206 { 207 ASSERT_OVSL(); 208 209 /* First drop references to device. */ 210 hlist_del_rcu(&p->dp_hash_node); 211 212 /* Then destroy it. */ 213 ovs_vport_del(p); 214 } 215 216 /* Must be called with rcu_read_lock. */ 217 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb) 218 { 219 struct datapath *dp = p->dp; 220 struct sw_flow *flow; 221 struct dp_stats_percpu *stats; 222 struct sw_flow_key key; 223 u64 *stats_counter; 224 int error; 225 226 stats = this_cpu_ptr(dp->stats_percpu); 227 228 /* Extract flow from 'skb' into 'key'. */ 229 error = ovs_flow_extract(skb, p->port_no, &key); 230 if (unlikely(error)) { 231 kfree_skb(skb); 232 return; 233 } 234 235 /* Look up flow. */ 236 flow = ovs_flow_tbl_lookup(&dp->table, &key); 237 if (unlikely(!flow)) { 238 struct dp_upcall_info upcall; 239 240 upcall.cmd = OVS_PACKET_CMD_MISS; 241 upcall.key = &key; 242 upcall.userdata = NULL; 243 upcall.portid = p->upcall_portid; 244 ovs_dp_upcall(dp, skb, &upcall); 245 consume_skb(skb); 246 stats_counter = &stats->n_missed; 247 goto out; 248 } 249 250 OVS_CB(skb)->flow = flow; 251 OVS_CB(skb)->pkt_key = &key; 252 253 stats_counter = &stats->n_hit; 254 ovs_flow_used(OVS_CB(skb)->flow, skb); 255 ovs_execute_actions(dp, skb); 256 257 out: 258 /* Update datapath statistics. */ 259 u64_stats_update_begin(&stats->sync); 260 (*stats_counter)++; 261 u64_stats_update_end(&stats->sync); 262 } 263 264 static struct genl_family dp_packet_genl_family = { 265 .id = GENL_ID_GENERATE, 266 .hdrsize = sizeof(struct ovs_header), 267 .name = OVS_PACKET_FAMILY, 268 .version = OVS_PACKET_VERSION, 269 .maxattr = OVS_PACKET_ATTR_MAX, 270 .netnsok = true, 271 .parallel_ops = true, 272 }; 273 274 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 275 const struct dp_upcall_info *upcall_info) 276 { 277 struct dp_stats_percpu *stats; 278 int dp_ifindex; 279 int err; 280 281 if (upcall_info->portid == 0) { 282 err = -ENOTCONN; 283 goto err; 284 } 285 286 dp_ifindex = get_dpifindex(dp); 287 if (!dp_ifindex) { 288 err = -ENODEV; 289 goto err; 290 } 291 292 if (!skb_is_gso(skb)) 293 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info); 294 else 295 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info); 296 if (err) 297 goto err; 298 299 return 0; 300 301 err: 302 stats = this_cpu_ptr(dp->stats_percpu); 303 304 u64_stats_update_begin(&stats->sync); 305 stats->n_lost++; 306 u64_stats_update_end(&stats->sync); 307 308 return err; 309 } 310 311 static int queue_gso_packets(struct net *net, int dp_ifindex, 312 struct sk_buff *skb, 313 const struct dp_upcall_info *upcall_info) 314 { 315 unsigned short gso_type = skb_shinfo(skb)->gso_type; 316 struct dp_upcall_info later_info; 317 struct sw_flow_key later_key; 318 struct sk_buff *segs, *nskb; 319 int err; 320 321 segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false); 322 if (IS_ERR(segs)) 323 return PTR_ERR(segs); 324 325 /* Queue all of the segments. */ 326 skb = segs; 327 do { 328 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info); 329 if (err) 330 break; 331 332 if (skb == segs && gso_type & SKB_GSO_UDP) { 333 /* The initial flow key extracted by ovs_flow_extract() 334 * in this case is for a first fragment, so we need to 335 * properly mark later fragments. 336 */ 337 later_key = *upcall_info->key; 338 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 339 340 later_info = *upcall_info; 341 later_info.key = &later_key; 342 upcall_info = &later_info; 343 } 344 } while ((skb = skb->next)); 345 346 /* Free all of the segments. */ 347 skb = segs; 348 do { 349 nskb = skb->next; 350 if (err) 351 kfree_skb(skb); 352 else 353 consume_skb(skb); 354 } while ((skb = nskb)); 355 return err; 356 } 357 358 static size_t key_attr_size(void) 359 { 360 return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */ 361 + nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */ 362 + nla_total_size(8) /* OVS_TUNNEL_KEY_ATTR_ID */ 363 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */ 364 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */ 365 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TOS */ 366 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TTL */ 367 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */ 368 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_CSUM */ 369 + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */ 370 + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */ 371 + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */ 372 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */ 373 + nla_total_size(4) /* OVS_KEY_ATTR_8021Q */ 374 + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */ 375 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */ 376 + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */ 377 + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */ 378 + nla_total_size(28); /* OVS_KEY_ATTR_ND */ 379 } 380 381 static size_t upcall_msg_size(const struct sk_buff *skb, 382 const struct nlattr *userdata) 383 { 384 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 385 + nla_total_size(skb->len) /* OVS_PACKET_ATTR_PACKET */ 386 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */ 387 388 /* OVS_PACKET_ATTR_USERDATA */ 389 if (userdata) 390 size += NLA_ALIGN(userdata->nla_len); 391 392 return size; 393 } 394 395 static int queue_userspace_packet(struct net *net, int dp_ifindex, 396 struct sk_buff *skb, 397 const struct dp_upcall_info *upcall_info) 398 { 399 struct ovs_header *upcall; 400 struct sk_buff *nskb = NULL; 401 struct sk_buff *user_skb; /* to be queued to userspace */ 402 struct nlattr *nla; 403 int err; 404 405 if (vlan_tx_tag_present(skb)) { 406 nskb = skb_clone(skb, GFP_ATOMIC); 407 if (!nskb) 408 return -ENOMEM; 409 410 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb)); 411 if (!nskb) 412 return -ENOMEM; 413 414 nskb->vlan_tci = 0; 415 skb = nskb; 416 } 417 418 if (nla_attr_size(skb->len) > USHRT_MAX) { 419 err = -EFBIG; 420 goto out; 421 } 422 423 user_skb = genlmsg_new(upcall_msg_size(skb, upcall_info->userdata), GFP_ATOMIC); 424 if (!user_skb) { 425 err = -ENOMEM; 426 goto out; 427 } 428 429 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 430 0, upcall_info->cmd); 431 upcall->dp_ifindex = dp_ifindex; 432 433 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY); 434 ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb); 435 nla_nest_end(user_skb, nla); 436 437 if (upcall_info->userdata) 438 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 439 nla_len(upcall_info->userdata), 440 nla_data(upcall_info->userdata)); 441 442 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len); 443 444 skb_copy_and_csum_dev(skb, nla_data(nla)); 445 446 genlmsg_end(user_skb, upcall); 447 err = genlmsg_unicast(net, user_skb, upcall_info->portid); 448 449 out: 450 kfree_skb(nskb); 451 return err; 452 } 453 454 static void clear_stats(struct sw_flow *flow) 455 { 456 flow->used = 0; 457 flow->tcp_flags = 0; 458 flow->packet_count = 0; 459 flow->byte_count = 0; 460 } 461 462 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 463 { 464 struct ovs_header *ovs_header = info->userhdr; 465 struct nlattr **a = info->attrs; 466 struct sw_flow_actions *acts; 467 struct sk_buff *packet; 468 struct sw_flow *flow; 469 struct datapath *dp; 470 struct ethhdr *eth; 471 int len; 472 int err; 473 474 err = -EINVAL; 475 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 476 !a[OVS_PACKET_ATTR_ACTIONS]) 477 goto err; 478 479 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 480 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 481 err = -ENOMEM; 482 if (!packet) 483 goto err; 484 skb_reserve(packet, NET_IP_ALIGN); 485 486 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 487 488 skb_reset_mac_header(packet); 489 eth = eth_hdr(packet); 490 491 /* Normally, setting the skb 'protocol' field would be handled by a 492 * call to eth_type_trans(), but it assumes there's a sending 493 * device, which we may not have. */ 494 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) 495 packet->protocol = eth->h_proto; 496 else 497 packet->protocol = htons(ETH_P_802_2); 498 499 /* Build an sw_flow for sending this packet. */ 500 flow = ovs_flow_alloc(); 501 err = PTR_ERR(flow); 502 if (IS_ERR(flow)) 503 goto err_kfree_skb; 504 505 err = ovs_flow_extract(packet, -1, &flow->key); 506 if (err) 507 goto err_flow_free; 508 509 err = ovs_nla_get_flow_metadata(flow, a[OVS_PACKET_ATTR_KEY]); 510 if (err) 511 goto err_flow_free; 512 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS])); 513 err = PTR_ERR(acts); 514 if (IS_ERR(acts)) 515 goto err_flow_free; 516 517 err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS], 518 &flow->key, 0, &acts); 519 rcu_assign_pointer(flow->sf_acts, acts); 520 if (err) 521 goto err_flow_free; 522 523 OVS_CB(packet)->flow = flow; 524 OVS_CB(packet)->pkt_key = &flow->key; 525 packet->priority = flow->key.phy.priority; 526 packet->mark = flow->key.phy.skb_mark; 527 528 rcu_read_lock(); 529 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 530 err = -ENODEV; 531 if (!dp) 532 goto err_unlock; 533 534 local_bh_disable(); 535 err = ovs_execute_actions(dp, packet); 536 local_bh_enable(); 537 rcu_read_unlock(); 538 539 ovs_flow_free(flow, false); 540 return err; 541 542 err_unlock: 543 rcu_read_unlock(); 544 err_flow_free: 545 ovs_flow_free(flow, false); 546 err_kfree_skb: 547 kfree_skb(packet); 548 err: 549 return err; 550 } 551 552 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 553 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 554 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 555 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 556 }; 557 558 static struct genl_ops dp_packet_genl_ops[] = { 559 { .cmd = OVS_PACKET_CMD_EXECUTE, 560 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 561 .policy = packet_policy, 562 .doit = ovs_packet_cmd_execute 563 } 564 }; 565 566 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats) 567 { 568 int i; 569 570 stats->n_flows = ovs_flow_tbl_count(&dp->table); 571 572 stats->n_hit = stats->n_missed = stats->n_lost = 0; 573 for_each_possible_cpu(i) { 574 const struct dp_stats_percpu *percpu_stats; 575 struct dp_stats_percpu local_stats; 576 unsigned int start; 577 578 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 579 580 do { 581 start = u64_stats_fetch_begin_bh(&percpu_stats->sync); 582 local_stats = *percpu_stats; 583 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start)); 584 585 stats->n_hit += local_stats.n_hit; 586 stats->n_missed += local_stats.n_missed; 587 stats->n_lost += local_stats.n_lost; 588 } 589 } 590 591 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 592 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 593 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 594 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 595 }; 596 597 static struct genl_family dp_flow_genl_family = { 598 .id = GENL_ID_GENERATE, 599 .hdrsize = sizeof(struct ovs_header), 600 .name = OVS_FLOW_FAMILY, 601 .version = OVS_FLOW_VERSION, 602 .maxattr = OVS_FLOW_ATTR_MAX, 603 .netnsok = true, 604 .parallel_ops = true, 605 }; 606 607 static struct genl_multicast_group ovs_dp_flow_multicast_group = { 608 .name = OVS_FLOW_MCGROUP 609 }; 610 611 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts) 612 { 613 return NLMSG_ALIGN(sizeof(struct ovs_header)) 614 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */ 615 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */ 616 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 617 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 618 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */ 619 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */ 620 } 621 622 /* Called with ovs_mutex. */ 623 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp, 624 struct sk_buff *skb, u32 portid, 625 u32 seq, u32 flags, u8 cmd) 626 { 627 const int skb_orig_len = skb->len; 628 struct nlattr *start; 629 struct ovs_flow_stats stats; 630 struct ovs_header *ovs_header; 631 struct nlattr *nla; 632 unsigned long used; 633 u8 tcp_flags; 634 int err; 635 636 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd); 637 if (!ovs_header) 638 return -EMSGSIZE; 639 640 ovs_header->dp_ifindex = get_dpifindex(dp); 641 642 /* Fill flow key. */ 643 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY); 644 if (!nla) 645 goto nla_put_failure; 646 647 err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb); 648 if (err) 649 goto error; 650 nla_nest_end(skb, nla); 651 652 nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK); 653 if (!nla) 654 goto nla_put_failure; 655 656 err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb); 657 if (err) 658 goto error; 659 660 nla_nest_end(skb, nla); 661 662 spin_lock_bh(&flow->lock); 663 used = flow->used; 664 stats.n_packets = flow->packet_count; 665 stats.n_bytes = flow->byte_count; 666 tcp_flags = flow->tcp_flags; 667 spin_unlock_bh(&flow->lock); 668 669 if (used && 670 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used))) 671 goto nla_put_failure; 672 673 if (stats.n_packets && 674 nla_put(skb, OVS_FLOW_ATTR_STATS, 675 sizeof(struct ovs_flow_stats), &stats)) 676 goto nla_put_failure; 677 678 if (tcp_flags && 679 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags)) 680 goto nla_put_failure; 681 682 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 683 * this is the first flow to be dumped into 'skb'. This is unusual for 684 * Netlink but individual action lists can be longer than 685 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 686 * The userspace caller can always fetch the actions separately if it 687 * really wants them. (Most userspace callers in fact don't care.) 688 * 689 * This can only fail for dump operations because the skb is always 690 * properly sized for single flows. 691 */ 692 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS); 693 if (start) { 694 const struct sw_flow_actions *sf_acts; 695 696 sf_acts = rcu_dereference_check(flow->sf_acts, 697 lockdep_ovsl_is_held()); 698 699 err = ovs_nla_put_actions(sf_acts->actions, 700 sf_acts->actions_len, skb); 701 if (!err) 702 nla_nest_end(skb, start); 703 else { 704 if (skb_orig_len) 705 goto error; 706 707 nla_nest_cancel(skb, start); 708 } 709 } else if (skb_orig_len) 710 goto nla_put_failure; 711 712 return genlmsg_end(skb, ovs_header); 713 714 nla_put_failure: 715 err = -EMSGSIZE; 716 error: 717 genlmsg_cancel(skb, ovs_header); 718 return err; 719 } 720 721 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow) 722 { 723 const struct sw_flow_actions *sf_acts; 724 725 sf_acts = ovsl_dereference(flow->sf_acts); 726 727 return genlmsg_new(ovs_flow_cmd_msg_size(sf_acts), GFP_KERNEL); 728 } 729 730 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow, 731 struct datapath *dp, 732 u32 portid, u32 seq, u8 cmd) 733 { 734 struct sk_buff *skb; 735 int retval; 736 737 skb = ovs_flow_cmd_alloc_info(flow); 738 if (!skb) 739 return ERR_PTR(-ENOMEM); 740 741 retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd); 742 BUG_ON(retval < 0); 743 return skb; 744 } 745 746 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info) 747 { 748 struct nlattr **a = info->attrs; 749 struct ovs_header *ovs_header = info->userhdr; 750 struct sw_flow_key key, masked_key; 751 struct sw_flow *flow = NULL; 752 struct sw_flow_mask mask; 753 struct sk_buff *reply; 754 struct datapath *dp; 755 struct sw_flow_actions *acts = NULL; 756 struct sw_flow_match match; 757 int error; 758 759 /* Extract key. */ 760 error = -EINVAL; 761 if (!a[OVS_FLOW_ATTR_KEY]) 762 goto error; 763 764 ovs_match_init(&match, &key, &mask); 765 error = ovs_nla_get_match(&match, 766 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]); 767 if (error) 768 goto error; 769 770 /* Validate actions. */ 771 if (a[OVS_FLOW_ATTR_ACTIONS]) { 772 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS])); 773 error = PTR_ERR(acts); 774 if (IS_ERR(acts)) 775 goto error; 776 777 ovs_flow_mask_key(&masked_key, &key, &mask); 778 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], 779 &masked_key, 0, &acts); 780 if (error) { 781 OVS_NLERR("Flow actions may not be safe on all matching packets.\n"); 782 goto err_kfree; 783 } 784 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) { 785 error = -EINVAL; 786 goto error; 787 } 788 789 ovs_lock(); 790 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 791 error = -ENODEV; 792 if (!dp) 793 goto err_unlock_ovs; 794 795 /* Check if this is a duplicate flow */ 796 flow = ovs_flow_tbl_lookup(&dp->table, &key); 797 if (!flow) { 798 struct sw_flow_mask *mask_p; 799 800 /* Bail out if we're not allowed to create a new flow. */ 801 error = -ENOENT; 802 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET) 803 goto err_unlock_ovs; 804 805 /* Allocate flow. */ 806 flow = ovs_flow_alloc(); 807 if (IS_ERR(flow)) { 808 error = PTR_ERR(flow); 809 goto err_unlock_ovs; 810 } 811 clear_stats(flow); 812 813 flow->key = masked_key; 814 flow->unmasked_key = key; 815 816 /* Make sure mask is unique in the system */ 817 mask_p = ovs_sw_flow_mask_find(&dp->table, &mask); 818 if (!mask_p) { 819 /* Allocate a new mask if none exsits. */ 820 mask_p = ovs_sw_flow_mask_alloc(); 821 if (!mask_p) 822 goto err_flow_free; 823 mask_p->key = mask.key; 824 mask_p->range = mask.range; 825 ovs_sw_flow_mask_insert(&dp->table, mask_p); 826 } 827 828 ovs_sw_flow_mask_add_ref(mask_p); 829 flow->mask = mask_p; 830 rcu_assign_pointer(flow->sf_acts, acts); 831 832 /* Put flow in bucket. */ 833 ovs_flow_tbl_insert(&dp->table, flow); 834 835 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, 836 info->snd_seq, OVS_FLOW_CMD_NEW); 837 } else { 838 /* We found a matching flow. */ 839 struct sw_flow_actions *old_acts; 840 841 /* Bail out if we're not allowed to modify an existing flow. 842 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 843 * because Generic Netlink treats the latter as a dump 844 * request. We also accept NLM_F_EXCL in case that bug ever 845 * gets fixed. 846 */ 847 error = -EEXIST; 848 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW && 849 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL)) 850 goto err_unlock_ovs; 851 852 /* The unmasked key has to be the same for flow updates. */ 853 error = -EINVAL; 854 if (!ovs_flow_cmp_unmasked_key(flow, &match)) { 855 OVS_NLERR("Flow modification message rejected, unmasked key does not match.\n"); 856 goto err_unlock_ovs; 857 } 858 859 /* Update actions. */ 860 old_acts = ovsl_dereference(flow->sf_acts); 861 rcu_assign_pointer(flow->sf_acts, acts); 862 ovs_nla_free_flow_actions(old_acts); 863 864 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, 865 info->snd_seq, OVS_FLOW_CMD_NEW); 866 867 /* Clear stats. */ 868 if (a[OVS_FLOW_ATTR_CLEAR]) { 869 spin_lock_bh(&flow->lock); 870 clear_stats(flow); 871 spin_unlock_bh(&flow->lock); 872 } 873 } 874 ovs_unlock(); 875 876 if (!IS_ERR(reply)) 877 ovs_notify(reply, info, &ovs_dp_flow_multicast_group); 878 else 879 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 880 ovs_dp_flow_multicast_group.id, PTR_ERR(reply)); 881 return 0; 882 883 err_flow_free: 884 ovs_flow_free(flow, false); 885 err_unlock_ovs: 886 ovs_unlock(); 887 err_kfree: 888 kfree(acts); 889 error: 890 return error; 891 } 892 893 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 894 { 895 struct nlattr **a = info->attrs; 896 struct ovs_header *ovs_header = info->userhdr; 897 struct sw_flow_key key; 898 struct sk_buff *reply; 899 struct sw_flow *flow; 900 struct datapath *dp; 901 struct sw_flow_match match; 902 int err; 903 904 if (!a[OVS_FLOW_ATTR_KEY]) { 905 OVS_NLERR("Flow get message rejected, Key attribute missing.\n"); 906 return -EINVAL; 907 } 908 909 ovs_match_init(&match, &key, NULL); 910 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL); 911 if (err) 912 return err; 913 914 ovs_lock(); 915 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 916 if (!dp) { 917 err = -ENODEV; 918 goto unlock; 919 } 920 921 flow = ovs_flow_tbl_lookup(&dp->table, &key); 922 if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) { 923 err = -ENOENT; 924 goto unlock; 925 } 926 927 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, 928 info->snd_seq, OVS_FLOW_CMD_NEW); 929 if (IS_ERR(reply)) { 930 err = PTR_ERR(reply); 931 goto unlock; 932 } 933 934 ovs_unlock(); 935 return genlmsg_reply(reply, info); 936 unlock: 937 ovs_unlock(); 938 return err; 939 } 940 941 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 942 { 943 struct nlattr **a = info->attrs; 944 struct ovs_header *ovs_header = info->userhdr; 945 struct sw_flow_key key; 946 struct sk_buff *reply; 947 struct sw_flow *flow; 948 struct datapath *dp; 949 struct sw_flow_match match; 950 int err; 951 952 ovs_lock(); 953 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 954 if (!dp) { 955 err = -ENODEV; 956 goto unlock; 957 } 958 959 if (!a[OVS_FLOW_ATTR_KEY]) { 960 err = ovs_flow_tbl_flush(&dp->table); 961 goto unlock; 962 } 963 964 ovs_match_init(&match, &key, NULL); 965 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL); 966 if (err) 967 goto unlock; 968 969 flow = ovs_flow_tbl_lookup(&dp->table, &key); 970 if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) { 971 err = -ENOENT; 972 goto unlock; 973 } 974 975 reply = ovs_flow_cmd_alloc_info(flow); 976 if (!reply) { 977 err = -ENOMEM; 978 goto unlock; 979 } 980 981 ovs_flow_tbl_remove(&dp->table, flow); 982 983 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid, 984 info->snd_seq, 0, OVS_FLOW_CMD_DEL); 985 BUG_ON(err < 0); 986 987 ovs_flow_free(flow, true); 988 ovs_unlock(); 989 990 ovs_notify(reply, info, &ovs_dp_flow_multicast_group); 991 return 0; 992 unlock: 993 ovs_unlock(); 994 return err; 995 } 996 997 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 998 { 999 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1000 struct table_instance *ti; 1001 struct datapath *dp; 1002 1003 rcu_read_lock(); 1004 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1005 if (!dp) { 1006 rcu_read_unlock(); 1007 return -ENODEV; 1008 } 1009 1010 ti = rcu_dereference(dp->table.ti); 1011 for (;;) { 1012 struct sw_flow *flow; 1013 u32 bucket, obj; 1014 1015 bucket = cb->args[0]; 1016 obj = cb->args[1]; 1017 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1018 if (!flow) 1019 break; 1020 1021 if (ovs_flow_cmd_fill_info(flow, dp, skb, 1022 NETLINK_CB(cb->skb).portid, 1023 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1024 OVS_FLOW_CMD_NEW) < 0) 1025 break; 1026 1027 cb->args[0] = bucket; 1028 cb->args[1] = obj; 1029 } 1030 rcu_read_unlock(); 1031 return skb->len; 1032 } 1033 1034 static struct genl_ops dp_flow_genl_ops[] = { 1035 { .cmd = OVS_FLOW_CMD_NEW, 1036 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1037 .policy = flow_policy, 1038 .doit = ovs_flow_cmd_new_or_set 1039 }, 1040 { .cmd = OVS_FLOW_CMD_DEL, 1041 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1042 .policy = flow_policy, 1043 .doit = ovs_flow_cmd_del 1044 }, 1045 { .cmd = OVS_FLOW_CMD_GET, 1046 .flags = 0, /* OK for unprivileged users. */ 1047 .policy = flow_policy, 1048 .doit = ovs_flow_cmd_get, 1049 .dumpit = ovs_flow_cmd_dump 1050 }, 1051 { .cmd = OVS_FLOW_CMD_SET, 1052 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1053 .policy = flow_policy, 1054 .doit = ovs_flow_cmd_new_or_set, 1055 }, 1056 }; 1057 1058 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1059 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1060 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1061 }; 1062 1063 static struct genl_family dp_datapath_genl_family = { 1064 .id = GENL_ID_GENERATE, 1065 .hdrsize = sizeof(struct ovs_header), 1066 .name = OVS_DATAPATH_FAMILY, 1067 .version = OVS_DATAPATH_VERSION, 1068 .maxattr = OVS_DP_ATTR_MAX, 1069 .netnsok = true, 1070 .parallel_ops = true, 1071 }; 1072 1073 static struct genl_multicast_group ovs_dp_datapath_multicast_group = { 1074 .name = OVS_DATAPATH_MCGROUP 1075 }; 1076 1077 static size_t ovs_dp_cmd_msg_size(void) 1078 { 1079 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1080 1081 msgsize += nla_total_size(IFNAMSIZ); 1082 msgsize += nla_total_size(sizeof(struct ovs_dp_stats)); 1083 1084 return msgsize; 1085 } 1086 1087 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1088 u32 portid, u32 seq, u32 flags, u8 cmd) 1089 { 1090 struct ovs_header *ovs_header; 1091 struct ovs_dp_stats dp_stats; 1092 int err; 1093 1094 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1095 flags, cmd); 1096 if (!ovs_header) 1097 goto error; 1098 1099 ovs_header->dp_ifindex = get_dpifindex(dp); 1100 1101 rcu_read_lock(); 1102 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1103 rcu_read_unlock(); 1104 if (err) 1105 goto nla_put_failure; 1106 1107 get_dp_stats(dp, &dp_stats); 1108 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats)) 1109 goto nla_put_failure; 1110 1111 return genlmsg_end(skb, ovs_header); 1112 1113 nla_put_failure: 1114 genlmsg_cancel(skb, ovs_header); 1115 error: 1116 return -EMSGSIZE; 1117 } 1118 1119 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid, 1120 u32 seq, u8 cmd) 1121 { 1122 struct sk_buff *skb; 1123 int retval; 1124 1125 skb = genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL); 1126 if (!skb) 1127 return ERR_PTR(-ENOMEM); 1128 1129 retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd); 1130 if (retval < 0) { 1131 kfree_skb(skb); 1132 return ERR_PTR(retval); 1133 } 1134 return skb; 1135 } 1136 1137 /* Called with ovs_mutex. */ 1138 static struct datapath *lookup_datapath(struct net *net, 1139 struct ovs_header *ovs_header, 1140 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1141 { 1142 struct datapath *dp; 1143 1144 if (!a[OVS_DP_ATTR_NAME]) 1145 dp = get_dp(net, ovs_header->dp_ifindex); 1146 else { 1147 struct vport *vport; 1148 1149 rcu_read_lock(); 1150 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1151 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1152 rcu_read_unlock(); 1153 } 1154 return dp ? dp : ERR_PTR(-ENODEV); 1155 } 1156 1157 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1158 { 1159 struct nlattr **a = info->attrs; 1160 struct vport_parms parms; 1161 struct sk_buff *reply; 1162 struct datapath *dp; 1163 struct vport *vport; 1164 struct ovs_net *ovs_net; 1165 int err, i; 1166 1167 err = -EINVAL; 1168 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1169 goto err; 1170 1171 ovs_lock(); 1172 1173 err = -ENOMEM; 1174 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1175 if (dp == NULL) 1176 goto err_unlock_ovs; 1177 1178 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk))); 1179 1180 /* Allocate table. */ 1181 err = ovs_flow_tbl_init(&dp->table); 1182 if (err) 1183 goto err_free_dp; 1184 1185 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu); 1186 if (!dp->stats_percpu) { 1187 err = -ENOMEM; 1188 goto err_destroy_table; 1189 } 1190 1191 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head), 1192 GFP_KERNEL); 1193 if (!dp->ports) { 1194 err = -ENOMEM; 1195 goto err_destroy_percpu; 1196 } 1197 1198 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1199 INIT_HLIST_HEAD(&dp->ports[i]); 1200 1201 /* Set up our datapath device. */ 1202 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1203 parms.type = OVS_VPORT_TYPE_INTERNAL; 1204 parms.options = NULL; 1205 parms.dp = dp; 1206 parms.port_no = OVSP_LOCAL; 1207 parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]); 1208 1209 vport = new_vport(&parms); 1210 if (IS_ERR(vport)) { 1211 err = PTR_ERR(vport); 1212 if (err == -EBUSY) 1213 err = -EEXIST; 1214 1215 goto err_destroy_ports_array; 1216 } 1217 1218 reply = ovs_dp_cmd_build_info(dp, info->snd_portid, 1219 info->snd_seq, OVS_DP_CMD_NEW); 1220 err = PTR_ERR(reply); 1221 if (IS_ERR(reply)) 1222 goto err_destroy_local_port; 1223 1224 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1225 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1226 1227 ovs_unlock(); 1228 1229 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group); 1230 return 0; 1231 1232 err_destroy_local_port: 1233 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1234 err_destroy_ports_array: 1235 kfree(dp->ports); 1236 err_destroy_percpu: 1237 free_percpu(dp->stats_percpu); 1238 err_destroy_table: 1239 ovs_flow_tbl_destroy(&dp->table, false); 1240 err_free_dp: 1241 release_net(ovs_dp_get_net(dp)); 1242 kfree(dp); 1243 err_unlock_ovs: 1244 ovs_unlock(); 1245 err: 1246 return err; 1247 } 1248 1249 /* Called with ovs_mutex. */ 1250 static void __dp_destroy(struct datapath *dp) 1251 { 1252 int i; 1253 1254 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1255 struct vport *vport; 1256 struct hlist_node *n; 1257 1258 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1259 if (vport->port_no != OVSP_LOCAL) 1260 ovs_dp_detach_port(vport); 1261 } 1262 1263 list_del_rcu(&dp->list_node); 1264 1265 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1266 * all port in datapath are destroyed first before freeing datapath. 1267 */ 1268 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1269 1270 call_rcu(&dp->rcu, destroy_dp_rcu); 1271 } 1272 1273 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1274 { 1275 struct sk_buff *reply; 1276 struct datapath *dp; 1277 int err; 1278 1279 ovs_lock(); 1280 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1281 err = PTR_ERR(dp); 1282 if (IS_ERR(dp)) 1283 goto unlock; 1284 1285 reply = ovs_dp_cmd_build_info(dp, info->snd_portid, 1286 info->snd_seq, OVS_DP_CMD_DEL); 1287 err = PTR_ERR(reply); 1288 if (IS_ERR(reply)) 1289 goto unlock; 1290 1291 __dp_destroy(dp); 1292 ovs_unlock(); 1293 1294 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group); 1295 1296 return 0; 1297 unlock: 1298 ovs_unlock(); 1299 return err; 1300 } 1301 1302 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1303 { 1304 struct sk_buff *reply; 1305 struct datapath *dp; 1306 int err; 1307 1308 ovs_lock(); 1309 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1310 err = PTR_ERR(dp); 1311 if (IS_ERR(dp)) 1312 goto unlock; 1313 1314 reply = ovs_dp_cmd_build_info(dp, info->snd_portid, 1315 info->snd_seq, OVS_DP_CMD_NEW); 1316 if (IS_ERR(reply)) { 1317 err = PTR_ERR(reply); 1318 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 1319 ovs_dp_datapath_multicast_group.id, err); 1320 err = 0; 1321 goto unlock; 1322 } 1323 1324 ovs_unlock(); 1325 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group); 1326 1327 return 0; 1328 unlock: 1329 ovs_unlock(); 1330 return err; 1331 } 1332 1333 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1334 { 1335 struct sk_buff *reply; 1336 struct datapath *dp; 1337 int err; 1338 1339 ovs_lock(); 1340 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1341 if (IS_ERR(dp)) { 1342 err = PTR_ERR(dp); 1343 goto unlock; 1344 } 1345 1346 reply = ovs_dp_cmd_build_info(dp, info->snd_portid, 1347 info->snd_seq, OVS_DP_CMD_NEW); 1348 if (IS_ERR(reply)) { 1349 err = PTR_ERR(reply); 1350 goto unlock; 1351 } 1352 1353 ovs_unlock(); 1354 return genlmsg_reply(reply, info); 1355 1356 unlock: 1357 ovs_unlock(); 1358 return err; 1359 } 1360 1361 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1362 { 1363 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1364 struct datapath *dp; 1365 int skip = cb->args[0]; 1366 int i = 0; 1367 1368 rcu_read_lock(); 1369 list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) { 1370 if (i >= skip && 1371 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1372 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1373 OVS_DP_CMD_NEW) < 0) 1374 break; 1375 i++; 1376 } 1377 rcu_read_unlock(); 1378 1379 cb->args[0] = i; 1380 1381 return skb->len; 1382 } 1383 1384 static struct genl_ops dp_datapath_genl_ops[] = { 1385 { .cmd = OVS_DP_CMD_NEW, 1386 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1387 .policy = datapath_policy, 1388 .doit = ovs_dp_cmd_new 1389 }, 1390 { .cmd = OVS_DP_CMD_DEL, 1391 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1392 .policy = datapath_policy, 1393 .doit = ovs_dp_cmd_del 1394 }, 1395 { .cmd = OVS_DP_CMD_GET, 1396 .flags = 0, /* OK for unprivileged users. */ 1397 .policy = datapath_policy, 1398 .doit = ovs_dp_cmd_get, 1399 .dumpit = ovs_dp_cmd_dump 1400 }, 1401 { .cmd = OVS_DP_CMD_SET, 1402 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1403 .policy = datapath_policy, 1404 .doit = ovs_dp_cmd_set, 1405 }, 1406 }; 1407 1408 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 1409 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1410 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 1411 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 1412 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 1413 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1414 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 1415 }; 1416 1417 static struct genl_family dp_vport_genl_family = { 1418 .id = GENL_ID_GENERATE, 1419 .hdrsize = sizeof(struct ovs_header), 1420 .name = OVS_VPORT_FAMILY, 1421 .version = OVS_VPORT_VERSION, 1422 .maxattr = OVS_VPORT_ATTR_MAX, 1423 .netnsok = true, 1424 .parallel_ops = true, 1425 }; 1426 1427 struct genl_multicast_group ovs_dp_vport_multicast_group = { 1428 .name = OVS_VPORT_MCGROUP 1429 }; 1430 1431 /* Called with ovs_mutex or RCU read lock. */ 1432 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1433 u32 portid, u32 seq, u32 flags, u8 cmd) 1434 { 1435 struct ovs_header *ovs_header; 1436 struct ovs_vport_stats vport_stats; 1437 int err; 1438 1439 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1440 flags, cmd); 1441 if (!ovs_header) 1442 return -EMSGSIZE; 1443 1444 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1445 1446 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1447 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1448 nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) || 1449 nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid)) 1450 goto nla_put_failure; 1451 1452 ovs_vport_get_stats(vport, &vport_stats); 1453 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), 1454 &vport_stats)) 1455 goto nla_put_failure; 1456 1457 err = ovs_vport_get_options(vport, skb); 1458 if (err == -EMSGSIZE) 1459 goto error; 1460 1461 return genlmsg_end(skb, ovs_header); 1462 1463 nla_put_failure: 1464 err = -EMSGSIZE; 1465 error: 1466 genlmsg_cancel(skb, ovs_header); 1467 return err; 1468 } 1469 1470 /* Called with ovs_mutex or RCU read lock. */ 1471 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid, 1472 u32 seq, u8 cmd) 1473 { 1474 struct sk_buff *skb; 1475 int retval; 1476 1477 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1478 if (!skb) 1479 return ERR_PTR(-ENOMEM); 1480 1481 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd); 1482 BUG_ON(retval < 0); 1483 1484 return skb; 1485 } 1486 1487 /* Called with ovs_mutex or RCU read lock. */ 1488 static struct vport *lookup_vport(struct net *net, 1489 struct ovs_header *ovs_header, 1490 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1491 { 1492 struct datapath *dp; 1493 struct vport *vport; 1494 1495 if (a[OVS_VPORT_ATTR_NAME]) { 1496 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 1497 if (!vport) 1498 return ERR_PTR(-ENODEV); 1499 if (ovs_header->dp_ifindex && 1500 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 1501 return ERR_PTR(-ENODEV); 1502 return vport; 1503 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 1504 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1505 1506 if (port_no >= DP_MAX_PORTS) 1507 return ERR_PTR(-EFBIG); 1508 1509 dp = get_dp(net, ovs_header->dp_ifindex); 1510 if (!dp) 1511 return ERR_PTR(-ENODEV); 1512 1513 vport = ovs_vport_ovsl_rcu(dp, port_no); 1514 if (!vport) 1515 return ERR_PTR(-ENODEV); 1516 return vport; 1517 } else 1518 return ERR_PTR(-EINVAL); 1519 } 1520 1521 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 1522 { 1523 struct nlattr **a = info->attrs; 1524 struct ovs_header *ovs_header = info->userhdr; 1525 struct vport_parms parms; 1526 struct sk_buff *reply; 1527 struct vport *vport; 1528 struct datapath *dp; 1529 u32 port_no; 1530 int err; 1531 1532 err = -EINVAL; 1533 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 1534 !a[OVS_VPORT_ATTR_UPCALL_PID]) 1535 goto exit; 1536 1537 ovs_lock(); 1538 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1539 err = -ENODEV; 1540 if (!dp) 1541 goto exit_unlock; 1542 1543 if (a[OVS_VPORT_ATTR_PORT_NO]) { 1544 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1545 1546 err = -EFBIG; 1547 if (port_no >= DP_MAX_PORTS) 1548 goto exit_unlock; 1549 1550 vport = ovs_vport_ovsl(dp, port_no); 1551 err = -EBUSY; 1552 if (vport) 1553 goto exit_unlock; 1554 } else { 1555 for (port_no = 1; ; port_no++) { 1556 if (port_no >= DP_MAX_PORTS) { 1557 err = -EFBIG; 1558 goto exit_unlock; 1559 } 1560 vport = ovs_vport_ovsl(dp, port_no); 1561 if (!vport) 1562 break; 1563 } 1564 } 1565 1566 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 1567 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 1568 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 1569 parms.dp = dp; 1570 parms.port_no = port_no; 1571 parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); 1572 1573 vport = new_vport(&parms); 1574 err = PTR_ERR(vport); 1575 if (IS_ERR(vport)) 1576 goto exit_unlock; 1577 1578 err = 0; 1579 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, 1580 OVS_VPORT_CMD_NEW); 1581 if (IS_ERR(reply)) { 1582 err = PTR_ERR(reply); 1583 ovs_dp_detach_port(vport); 1584 goto exit_unlock; 1585 } 1586 1587 ovs_notify(reply, info, &ovs_dp_vport_multicast_group); 1588 1589 exit_unlock: 1590 ovs_unlock(); 1591 exit: 1592 return err; 1593 } 1594 1595 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 1596 { 1597 struct nlattr **a = info->attrs; 1598 struct sk_buff *reply; 1599 struct vport *vport; 1600 int err; 1601 1602 ovs_lock(); 1603 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1604 err = PTR_ERR(vport); 1605 if (IS_ERR(vport)) 1606 goto exit_unlock; 1607 1608 if (a[OVS_VPORT_ATTR_TYPE] && 1609 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 1610 err = -EINVAL; 1611 goto exit_unlock; 1612 } 1613 1614 reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1615 if (!reply) { 1616 err = -ENOMEM; 1617 goto exit_unlock; 1618 } 1619 1620 if (a[OVS_VPORT_ATTR_OPTIONS]) { 1621 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 1622 if (err) 1623 goto exit_free; 1624 } 1625 1626 if (a[OVS_VPORT_ATTR_UPCALL_PID]) 1627 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); 1628 1629 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 1630 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 1631 BUG_ON(err < 0); 1632 1633 ovs_unlock(); 1634 ovs_notify(reply, info, &ovs_dp_vport_multicast_group); 1635 return 0; 1636 1637 exit_free: 1638 kfree_skb(reply); 1639 exit_unlock: 1640 ovs_unlock(); 1641 return err; 1642 } 1643 1644 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 1645 { 1646 struct nlattr **a = info->attrs; 1647 struct sk_buff *reply; 1648 struct vport *vport; 1649 int err; 1650 1651 ovs_lock(); 1652 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1653 err = PTR_ERR(vport); 1654 if (IS_ERR(vport)) 1655 goto exit_unlock; 1656 1657 if (vport->port_no == OVSP_LOCAL) { 1658 err = -EINVAL; 1659 goto exit_unlock; 1660 } 1661 1662 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, 1663 info->snd_seq, OVS_VPORT_CMD_DEL); 1664 err = PTR_ERR(reply); 1665 if (IS_ERR(reply)) 1666 goto exit_unlock; 1667 1668 err = 0; 1669 ovs_dp_detach_port(vport); 1670 1671 ovs_notify(reply, info, &ovs_dp_vport_multicast_group); 1672 1673 exit_unlock: 1674 ovs_unlock(); 1675 return err; 1676 } 1677 1678 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 1679 { 1680 struct nlattr **a = info->attrs; 1681 struct ovs_header *ovs_header = info->userhdr; 1682 struct sk_buff *reply; 1683 struct vport *vport; 1684 int err; 1685 1686 rcu_read_lock(); 1687 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 1688 err = PTR_ERR(vport); 1689 if (IS_ERR(vport)) 1690 goto exit_unlock; 1691 1692 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, 1693 info->snd_seq, OVS_VPORT_CMD_NEW); 1694 err = PTR_ERR(reply); 1695 if (IS_ERR(reply)) 1696 goto exit_unlock; 1697 1698 rcu_read_unlock(); 1699 1700 return genlmsg_reply(reply, info); 1701 1702 exit_unlock: 1703 rcu_read_unlock(); 1704 return err; 1705 } 1706 1707 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1708 { 1709 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1710 struct datapath *dp; 1711 int bucket = cb->args[0], skip = cb->args[1]; 1712 int i, j = 0; 1713 1714 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1715 if (!dp) 1716 return -ENODEV; 1717 1718 rcu_read_lock(); 1719 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 1720 struct vport *vport; 1721 1722 j = 0; 1723 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 1724 if (j >= skip && 1725 ovs_vport_cmd_fill_info(vport, skb, 1726 NETLINK_CB(cb->skb).portid, 1727 cb->nlh->nlmsg_seq, 1728 NLM_F_MULTI, 1729 OVS_VPORT_CMD_NEW) < 0) 1730 goto out; 1731 1732 j++; 1733 } 1734 skip = 0; 1735 } 1736 out: 1737 rcu_read_unlock(); 1738 1739 cb->args[0] = i; 1740 cb->args[1] = j; 1741 1742 return skb->len; 1743 } 1744 1745 static struct genl_ops dp_vport_genl_ops[] = { 1746 { .cmd = OVS_VPORT_CMD_NEW, 1747 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1748 .policy = vport_policy, 1749 .doit = ovs_vport_cmd_new 1750 }, 1751 { .cmd = OVS_VPORT_CMD_DEL, 1752 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1753 .policy = vport_policy, 1754 .doit = ovs_vport_cmd_del 1755 }, 1756 { .cmd = OVS_VPORT_CMD_GET, 1757 .flags = 0, /* OK for unprivileged users. */ 1758 .policy = vport_policy, 1759 .doit = ovs_vport_cmd_get, 1760 .dumpit = ovs_vport_cmd_dump 1761 }, 1762 { .cmd = OVS_VPORT_CMD_SET, 1763 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1764 .policy = vport_policy, 1765 .doit = ovs_vport_cmd_set, 1766 }, 1767 }; 1768 1769 struct genl_family_and_ops { 1770 struct genl_family *family; 1771 struct genl_ops *ops; 1772 int n_ops; 1773 struct genl_multicast_group *group; 1774 }; 1775 1776 static const struct genl_family_and_ops dp_genl_families[] = { 1777 { &dp_datapath_genl_family, 1778 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops), 1779 &ovs_dp_datapath_multicast_group }, 1780 { &dp_vport_genl_family, 1781 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops), 1782 &ovs_dp_vport_multicast_group }, 1783 { &dp_flow_genl_family, 1784 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops), 1785 &ovs_dp_flow_multicast_group }, 1786 { &dp_packet_genl_family, 1787 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops), 1788 NULL }, 1789 }; 1790 1791 static void dp_unregister_genl(int n_families) 1792 { 1793 int i; 1794 1795 for (i = 0; i < n_families; i++) 1796 genl_unregister_family(dp_genl_families[i].family); 1797 } 1798 1799 static int dp_register_genl(void) 1800 { 1801 int n_registered; 1802 int err; 1803 int i; 1804 1805 n_registered = 0; 1806 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 1807 const struct genl_family_and_ops *f = &dp_genl_families[i]; 1808 1809 err = genl_register_family_with_ops(f->family, f->ops, 1810 f->n_ops); 1811 if (err) 1812 goto error; 1813 n_registered++; 1814 1815 if (f->group) { 1816 err = genl_register_mc_group(f->family, f->group); 1817 if (err) 1818 goto error; 1819 } 1820 } 1821 1822 return 0; 1823 1824 error: 1825 dp_unregister_genl(n_registered); 1826 return err; 1827 } 1828 1829 static int __net_init ovs_init_net(struct net *net) 1830 { 1831 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1832 1833 INIT_LIST_HEAD(&ovs_net->dps); 1834 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 1835 return 0; 1836 } 1837 1838 static void __net_exit ovs_exit_net(struct net *net) 1839 { 1840 struct datapath *dp, *dp_next; 1841 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1842 1843 ovs_lock(); 1844 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 1845 __dp_destroy(dp); 1846 ovs_unlock(); 1847 1848 cancel_work_sync(&ovs_net->dp_notify_work); 1849 } 1850 1851 static struct pernet_operations ovs_net_ops = { 1852 .init = ovs_init_net, 1853 .exit = ovs_exit_net, 1854 .id = &ovs_net_id, 1855 .size = sizeof(struct ovs_net), 1856 }; 1857 1858 static int __init dp_init(void) 1859 { 1860 int err; 1861 1862 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); 1863 1864 pr_info("Open vSwitch switching datapath\n"); 1865 1866 err = ovs_flow_init(); 1867 if (err) 1868 goto error; 1869 1870 err = ovs_vport_init(); 1871 if (err) 1872 goto error_flow_exit; 1873 1874 err = register_pernet_device(&ovs_net_ops); 1875 if (err) 1876 goto error_vport_exit; 1877 1878 err = register_netdevice_notifier(&ovs_dp_device_notifier); 1879 if (err) 1880 goto error_netns_exit; 1881 1882 err = dp_register_genl(); 1883 if (err < 0) 1884 goto error_unreg_notifier; 1885 1886 return 0; 1887 1888 error_unreg_notifier: 1889 unregister_netdevice_notifier(&ovs_dp_device_notifier); 1890 error_netns_exit: 1891 unregister_pernet_device(&ovs_net_ops); 1892 error_vport_exit: 1893 ovs_vport_exit(); 1894 error_flow_exit: 1895 ovs_flow_exit(); 1896 error: 1897 return err; 1898 } 1899 1900 static void dp_cleanup(void) 1901 { 1902 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 1903 unregister_netdevice_notifier(&ovs_dp_device_notifier); 1904 unregister_pernet_device(&ovs_net_ops); 1905 rcu_barrier(); 1906 ovs_vport_exit(); 1907 ovs_flow_exit(); 1908 } 1909 1910 module_init(dp_init); 1911 module_exit(dp_cleanup); 1912 1913 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 1914 MODULE_LICENSE("GPL"); 1915