1 /* 2 * Copyright (c) 2007-2014 Nicira, Inc. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of version 2 of the GNU General Public 6 * License as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 * General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program; if not, write to the Free Software 15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 16 * 02110-1301, USA 17 */ 18 19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 20 21 #include <linux/init.h> 22 #include <linux/module.h> 23 #include <linux/if_arp.h> 24 #include <linux/if_vlan.h> 25 #include <linux/in.h> 26 #include <linux/ip.h> 27 #include <linux/jhash.h> 28 #include <linux/delay.h> 29 #include <linux/time.h> 30 #include <linux/etherdevice.h> 31 #include <linux/genetlink.h> 32 #include <linux/kernel.h> 33 #include <linux/kthread.h> 34 #include <linux/mutex.h> 35 #include <linux/percpu.h> 36 #include <linux/rcupdate.h> 37 #include <linux/tcp.h> 38 #include <linux/udp.h> 39 #include <linux/ethtool.h> 40 #include <linux/wait.h> 41 #include <asm/div64.h> 42 #include <linux/highmem.h> 43 #include <linux/netfilter_bridge.h> 44 #include <linux/netfilter_ipv4.h> 45 #include <linux/inetdevice.h> 46 #include <linux/list.h> 47 #include <linux/openvswitch.h> 48 #include <linux/rculist.h> 49 #include <linux/dmi.h> 50 #include <net/genetlink.h> 51 #include <net/net_namespace.h> 52 #include <net/netns/generic.h> 53 54 #include "datapath.h" 55 #include "flow.h" 56 #include "flow_table.h" 57 #include "flow_netlink.h" 58 #include "vport-internal_dev.h" 59 #include "vport-netdev.h" 60 61 int ovs_net_id __read_mostly; 62 EXPORT_SYMBOL_GPL(ovs_net_id); 63 64 static struct genl_family dp_packet_genl_family; 65 static struct genl_family dp_flow_genl_family; 66 static struct genl_family dp_datapath_genl_family; 67 68 static const struct nla_policy flow_policy[]; 69 70 static const struct genl_multicast_group ovs_dp_flow_multicast_group = { 71 .name = OVS_FLOW_MCGROUP, 72 }; 73 74 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = { 75 .name = OVS_DATAPATH_MCGROUP, 76 }; 77 78 static const struct genl_multicast_group ovs_dp_vport_multicast_group = { 79 .name = OVS_VPORT_MCGROUP, 80 }; 81 82 /* Check if need to build a reply message. 83 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */ 84 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info, 85 unsigned int group) 86 { 87 return info->nlhdr->nlmsg_flags & NLM_F_ECHO || 88 genl_has_listeners(family, genl_info_net(info), group); 89 } 90 91 static void ovs_notify(struct genl_family *family, 92 struct sk_buff *skb, struct genl_info *info) 93 { 94 genl_notify(family, skb, info, 0, GFP_KERNEL); 95 } 96 97 /** 98 * DOC: Locking: 99 * 100 * All writes e.g. Writes to device state (add/remove datapath, port, set 101 * operations on vports, etc.), Writes to other state (flow table 102 * modifications, set miscellaneous datapath parameters, etc.) are protected 103 * by ovs_lock. 104 * 105 * Reads are protected by RCU. 106 * 107 * There are a few special cases (mostly stats) that have their own 108 * synchronization but they nest under all of above and don't interact with 109 * each other. 110 * 111 * The RTNL lock nests inside ovs_mutex. 112 */ 113 114 static DEFINE_MUTEX(ovs_mutex); 115 116 void ovs_lock(void) 117 { 118 mutex_lock(&ovs_mutex); 119 } 120 121 void ovs_unlock(void) 122 { 123 mutex_unlock(&ovs_mutex); 124 } 125 126 #ifdef CONFIG_LOCKDEP 127 int lockdep_ovsl_is_held(void) 128 { 129 if (debug_locks) 130 return lockdep_is_held(&ovs_mutex); 131 else 132 return 1; 133 } 134 EXPORT_SYMBOL_GPL(lockdep_ovsl_is_held); 135 #endif 136 137 static struct vport *new_vport(const struct vport_parms *); 138 static int queue_gso_packets(struct datapath *dp, struct sk_buff *, 139 const struct sw_flow_key *, 140 const struct dp_upcall_info *); 141 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *, 142 const struct sw_flow_key *, 143 const struct dp_upcall_info *); 144 145 /* Must be called with rcu_read_lock. */ 146 static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex) 147 { 148 struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex); 149 150 if (dev) { 151 struct vport *vport = ovs_internal_dev_get_vport(dev); 152 if (vport) 153 return vport->dp; 154 } 155 156 return NULL; 157 } 158 159 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the 160 * returned dp pointer valid. 161 */ 162 static inline struct datapath *get_dp(struct net *net, int dp_ifindex) 163 { 164 struct datapath *dp; 165 166 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); 167 rcu_read_lock(); 168 dp = get_dp_rcu(net, dp_ifindex); 169 rcu_read_unlock(); 170 171 return dp; 172 } 173 174 /* Must be called with rcu_read_lock or ovs_mutex. */ 175 const char *ovs_dp_name(const struct datapath *dp) 176 { 177 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); 178 return ovs_vport_name(vport); 179 } 180 181 static int get_dpifindex(const struct datapath *dp) 182 { 183 struct vport *local; 184 int ifindex; 185 186 rcu_read_lock(); 187 188 local = ovs_vport_rcu(dp, OVSP_LOCAL); 189 if (local) 190 ifindex = local->dev->ifindex; 191 else 192 ifindex = 0; 193 194 rcu_read_unlock(); 195 196 return ifindex; 197 } 198 199 static void destroy_dp_rcu(struct rcu_head *rcu) 200 { 201 struct datapath *dp = container_of(rcu, struct datapath, rcu); 202 203 ovs_flow_tbl_destroy(&dp->table); 204 free_percpu(dp->stats_percpu); 205 kfree(dp->ports); 206 kfree(dp); 207 } 208 209 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 210 u16 port_no) 211 { 212 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 213 } 214 215 /* Called with ovs_mutex or RCU read lock. */ 216 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 217 { 218 struct vport *vport; 219 struct hlist_head *head; 220 221 head = vport_hash_bucket(dp, port_no); 222 hlist_for_each_entry_rcu(vport, head, dp_hash_node) { 223 if (vport->port_no == port_no) 224 return vport; 225 } 226 return NULL; 227 } 228 229 /* Called with ovs_mutex. */ 230 static struct vport *new_vport(const struct vport_parms *parms) 231 { 232 struct vport *vport; 233 234 vport = ovs_vport_add(parms); 235 if (!IS_ERR(vport)) { 236 struct datapath *dp = parms->dp; 237 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 238 239 hlist_add_head_rcu(&vport->dp_hash_node, head); 240 } 241 return vport; 242 } 243 244 void ovs_dp_detach_port(struct vport *p) 245 { 246 ASSERT_OVSL(); 247 248 /* First drop references to device. */ 249 hlist_del_rcu(&p->dp_hash_node); 250 251 /* Then destroy it. */ 252 ovs_vport_del(p); 253 } 254 255 /* Must be called with rcu_read_lock. */ 256 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key) 257 { 258 const struct vport *p = OVS_CB(skb)->input_vport; 259 struct datapath *dp = p->dp; 260 struct sw_flow *flow; 261 struct sw_flow_actions *sf_acts; 262 struct dp_stats_percpu *stats; 263 u64 *stats_counter; 264 u32 n_mask_hit; 265 266 stats = this_cpu_ptr(dp->stats_percpu); 267 268 /* Look up flow. */ 269 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit); 270 if (unlikely(!flow)) { 271 struct dp_upcall_info upcall; 272 int error; 273 274 memset(&upcall, 0, sizeof(upcall)); 275 upcall.cmd = OVS_PACKET_CMD_MISS; 276 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 277 upcall.mru = OVS_CB(skb)->mru; 278 error = ovs_dp_upcall(dp, skb, key, &upcall); 279 if (unlikely(error)) 280 kfree_skb(skb); 281 else 282 consume_skb(skb); 283 stats_counter = &stats->n_missed; 284 goto out; 285 } 286 287 ovs_flow_stats_update(flow, key->tp.flags, skb); 288 sf_acts = rcu_dereference(flow->sf_acts); 289 ovs_execute_actions(dp, skb, sf_acts, key); 290 291 stats_counter = &stats->n_hit; 292 293 out: 294 /* Update datapath statistics. */ 295 u64_stats_update_begin(&stats->syncp); 296 (*stats_counter)++; 297 stats->n_mask_hit += n_mask_hit; 298 u64_stats_update_end(&stats->syncp); 299 } 300 301 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 302 const struct sw_flow_key *key, 303 const struct dp_upcall_info *upcall_info) 304 { 305 struct dp_stats_percpu *stats; 306 int err; 307 308 if (upcall_info->portid == 0) { 309 err = -ENOTCONN; 310 goto err; 311 } 312 313 if (!skb_is_gso(skb)) 314 err = queue_userspace_packet(dp, skb, key, upcall_info); 315 else 316 err = queue_gso_packets(dp, skb, key, upcall_info); 317 if (err) 318 goto err; 319 320 return 0; 321 322 err: 323 stats = this_cpu_ptr(dp->stats_percpu); 324 325 u64_stats_update_begin(&stats->syncp); 326 stats->n_lost++; 327 u64_stats_update_end(&stats->syncp); 328 329 return err; 330 } 331 332 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 333 const struct sw_flow_key *key, 334 const struct dp_upcall_info *upcall_info) 335 { 336 unsigned short gso_type = skb_shinfo(skb)->gso_type; 337 struct sw_flow_key later_key; 338 struct sk_buff *segs, *nskb; 339 int err; 340 341 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET); 342 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 343 if (IS_ERR(segs)) 344 return PTR_ERR(segs); 345 if (segs == NULL) 346 return -EINVAL; 347 348 if (gso_type & SKB_GSO_UDP) { 349 /* The initial flow key extracted by ovs_flow_key_extract() 350 * in this case is for a first fragment, so we need to 351 * properly mark later fragments. 352 */ 353 later_key = *key; 354 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 355 } 356 357 /* Queue all of the segments. */ 358 skb = segs; 359 do { 360 if (gso_type & SKB_GSO_UDP && skb != segs) 361 key = &later_key; 362 363 err = queue_userspace_packet(dp, skb, key, upcall_info); 364 if (err) 365 break; 366 367 } while ((skb = skb->next)); 368 369 /* Free all of the segments. */ 370 skb = segs; 371 do { 372 nskb = skb->next; 373 if (err) 374 kfree_skb(skb); 375 else 376 consume_skb(skb); 377 } while ((skb = nskb)); 378 return err; 379 } 380 381 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, 382 unsigned int hdrlen) 383 { 384 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 385 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 386 + nla_total_size(ovs_key_attr_size()); /* OVS_PACKET_ATTR_KEY */ 387 388 /* OVS_PACKET_ATTR_USERDATA */ 389 if (upcall_info->userdata) 390 size += NLA_ALIGN(upcall_info->userdata->nla_len); 391 392 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ 393 if (upcall_info->egress_tun_info) 394 size += nla_total_size(ovs_tun_key_attr_size()); 395 396 /* OVS_PACKET_ATTR_ACTIONS */ 397 if (upcall_info->actions_len) 398 size += nla_total_size(upcall_info->actions_len); 399 400 /* OVS_PACKET_ATTR_MRU */ 401 if (upcall_info->mru) 402 size += nla_total_size(sizeof(upcall_info->mru)); 403 404 return size; 405 } 406 407 static void pad_packet(struct datapath *dp, struct sk_buff *skb) 408 { 409 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 410 size_t plen = NLA_ALIGN(skb->len) - skb->len; 411 412 if (plen > 0) 413 memset(skb_put(skb, plen), 0, plen); 414 } 415 } 416 417 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 418 const struct sw_flow_key *key, 419 const struct dp_upcall_info *upcall_info) 420 { 421 struct ovs_header *upcall; 422 struct sk_buff *nskb = NULL; 423 struct sk_buff *user_skb = NULL; /* to be queued to userspace */ 424 struct nlattr *nla; 425 struct genl_info info = { 426 .dst_sk = ovs_dp_get_net(dp)->genl_sock, 427 .snd_portid = upcall_info->portid, 428 }; 429 size_t len; 430 unsigned int hlen; 431 int err, dp_ifindex; 432 433 dp_ifindex = get_dpifindex(dp); 434 if (!dp_ifindex) 435 return -ENODEV; 436 437 if (skb_vlan_tag_present(skb)) { 438 nskb = skb_clone(skb, GFP_ATOMIC); 439 if (!nskb) 440 return -ENOMEM; 441 442 nskb = __vlan_hwaccel_push_inside(nskb); 443 if (!nskb) 444 return -ENOMEM; 445 446 skb = nskb; 447 } 448 449 if (nla_attr_size(skb->len) > USHRT_MAX) { 450 err = -EFBIG; 451 goto out; 452 } 453 454 /* Complete checksum if needed */ 455 if (skb->ip_summed == CHECKSUM_PARTIAL && 456 (err = skb_checksum_help(skb))) 457 goto out; 458 459 /* Older versions of OVS user space enforce alignment of the last 460 * Netlink attribute to NLA_ALIGNTO which would require extensive 461 * padding logic. Only perform zerocopy if padding is not required. 462 */ 463 if (dp->user_features & OVS_DP_F_UNALIGNED) 464 hlen = skb_zerocopy_headlen(skb); 465 else 466 hlen = skb->len; 467 468 len = upcall_msg_size(upcall_info, hlen); 469 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC); 470 if (!user_skb) { 471 err = -ENOMEM; 472 goto out; 473 } 474 475 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 476 0, upcall_info->cmd); 477 upcall->dp_ifindex = dp_ifindex; 478 479 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); 480 BUG_ON(err); 481 482 if (upcall_info->userdata) 483 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 484 nla_len(upcall_info->userdata), 485 nla_data(upcall_info->userdata)); 486 487 if (upcall_info->egress_tun_info) { 488 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY); 489 err = ovs_nla_put_tunnel_info(user_skb, 490 upcall_info->egress_tun_info); 491 BUG_ON(err); 492 nla_nest_end(user_skb, nla); 493 } 494 495 if (upcall_info->actions_len) { 496 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS); 497 err = ovs_nla_put_actions(upcall_info->actions, 498 upcall_info->actions_len, 499 user_skb); 500 if (!err) 501 nla_nest_end(user_skb, nla); 502 else 503 nla_nest_cancel(user_skb, nla); 504 } 505 506 /* Add OVS_PACKET_ATTR_MRU */ 507 if (upcall_info->mru) { 508 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, 509 upcall_info->mru)) { 510 err = -ENOBUFS; 511 goto out; 512 } 513 pad_packet(dp, user_skb); 514 } 515 516 /* Only reserve room for attribute header, packet data is added 517 * in skb_zerocopy() */ 518 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 519 err = -ENOBUFS; 520 goto out; 521 } 522 nla->nla_len = nla_attr_size(skb->len); 523 524 err = skb_zerocopy(user_skb, skb, skb->len, hlen); 525 if (err) 526 goto out; 527 528 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 529 pad_packet(dp, user_skb); 530 531 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 532 533 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 534 user_skb = NULL; 535 out: 536 if (err) 537 skb_tx_error(skb); 538 kfree_skb(user_skb); 539 kfree_skb(nskb); 540 return err; 541 } 542 543 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 544 { 545 struct ovs_header *ovs_header = info->userhdr; 546 struct net *net = sock_net(skb->sk); 547 struct nlattr **a = info->attrs; 548 struct sw_flow_actions *acts; 549 struct sk_buff *packet; 550 struct sw_flow *flow; 551 struct sw_flow_actions *sf_acts; 552 struct datapath *dp; 553 struct ethhdr *eth; 554 struct vport *input_vport; 555 u16 mru = 0; 556 int len; 557 int err; 558 bool log = !a[OVS_PACKET_ATTR_PROBE]; 559 560 err = -EINVAL; 561 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 562 !a[OVS_PACKET_ATTR_ACTIONS]) 563 goto err; 564 565 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 566 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 567 err = -ENOMEM; 568 if (!packet) 569 goto err; 570 skb_reserve(packet, NET_IP_ALIGN); 571 572 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 573 574 skb_reset_mac_header(packet); 575 eth = eth_hdr(packet); 576 577 /* Normally, setting the skb 'protocol' field would be handled by a 578 * call to eth_type_trans(), but it assumes there's a sending 579 * device, which we may not have. */ 580 if (eth_proto_is_802_3(eth->h_proto)) 581 packet->protocol = eth->h_proto; 582 else 583 packet->protocol = htons(ETH_P_802_2); 584 585 /* Set packet's mru */ 586 if (a[OVS_PACKET_ATTR_MRU]) { 587 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]); 588 packet->ignore_df = 1; 589 } 590 OVS_CB(packet)->mru = mru; 591 592 /* Build an sw_flow for sending this packet. */ 593 flow = ovs_flow_alloc(); 594 err = PTR_ERR(flow); 595 if (IS_ERR(flow)) 596 goto err_kfree_skb; 597 598 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY], 599 packet, &flow->key, log); 600 if (err) 601 goto err_flow_free; 602 603 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS], 604 &flow->key, &acts, log); 605 if (err) 606 goto err_flow_free; 607 608 rcu_assign_pointer(flow->sf_acts, acts); 609 packet->priority = flow->key.phy.priority; 610 packet->mark = flow->key.phy.skb_mark; 611 612 rcu_read_lock(); 613 dp = get_dp_rcu(net, ovs_header->dp_ifindex); 614 err = -ENODEV; 615 if (!dp) 616 goto err_unlock; 617 618 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 619 if (!input_vport) 620 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 621 622 if (!input_vport) 623 goto err_unlock; 624 625 packet->dev = input_vport->dev; 626 OVS_CB(packet)->input_vport = input_vport; 627 sf_acts = rcu_dereference(flow->sf_acts); 628 629 local_bh_disable(); 630 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); 631 local_bh_enable(); 632 rcu_read_unlock(); 633 634 ovs_flow_free(flow, false); 635 return err; 636 637 err_unlock: 638 rcu_read_unlock(); 639 err_flow_free: 640 ovs_flow_free(flow, false); 641 err_kfree_skb: 642 kfree_skb(packet); 643 err: 644 return err; 645 } 646 647 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 648 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 649 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 650 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 651 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, 652 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, 653 }; 654 655 static const struct genl_ops dp_packet_genl_ops[] = { 656 { .cmd = OVS_PACKET_CMD_EXECUTE, 657 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 658 .policy = packet_policy, 659 .doit = ovs_packet_cmd_execute 660 } 661 }; 662 663 static struct genl_family dp_packet_genl_family = { 664 .id = GENL_ID_GENERATE, 665 .hdrsize = sizeof(struct ovs_header), 666 .name = OVS_PACKET_FAMILY, 667 .version = OVS_PACKET_VERSION, 668 .maxattr = OVS_PACKET_ATTR_MAX, 669 .netnsok = true, 670 .parallel_ops = true, 671 .ops = dp_packet_genl_ops, 672 .n_ops = ARRAY_SIZE(dp_packet_genl_ops), 673 }; 674 675 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 676 struct ovs_dp_megaflow_stats *mega_stats) 677 { 678 int i; 679 680 memset(mega_stats, 0, sizeof(*mega_stats)); 681 682 stats->n_flows = ovs_flow_tbl_count(&dp->table); 683 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 684 685 stats->n_hit = stats->n_missed = stats->n_lost = 0; 686 687 for_each_possible_cpu(i) { 688 const struct dp_stats_percpu *percpu_stats; 689 struct dp_stats_percpu local_stats; 690 unsigned int start; 691 692 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 693 694 do { 695 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 696 local_stats = *percpu_stats; 697 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 698 699 stats->n_hit += local_stats.n_hit; 700 stats->n_missed += local_stats.n_missed; 701 stats->n_lost += local_stats.n_lost; 702 mega_stats->n_mask_hit += local_stats.n_mask_hit; 703 } 704 } 705 706 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) 707 { 708 return ovs_identifier_is_ufid(sfid) && 709 !(ufid_flags & OVS_UFID_F_OMIT_KEY); 710 } 711 712 static bool should_fill_mask(uint32_t ufid_flags) 713 { 714 return !(ufid_flags & OVS_UFID_F_OMIT_MASK); 715 } 716 717 static bool should_fill_actions(uint32_t ufid_flags) 718 { 719 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); 720 } 721 722 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, 723 const struct sw_flow_id *sfid, 724 uint32_t ufid_flags) 725 { 726 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); 727 728 /* OVS_FLOW_ATTR_UFID */ 729 if (sfid && ovs_identifier_is_ufid(sfid)) 730 len += nla_total_size(sfid->ufid_len); 731 732 /* OVS_FLOW_ATTR_KEY */ 733 if (!sfid || should_fill_key(sfid, ufid_flags)) 734 len += nla_total_size(ovs_key_attr_size()); 735 736 /* OVS_FLOW_ATTR_MASK */ 737 if (should_fill_mask(ufid_flags)) 738 len += nla_total_size(ovs_key_attr_size()); 739 740 /* OVS_FLOW_ATTR_ACTIONS */ 741 if (should_fill_actions(ufid_flags)) 742 len += nla_total_size(acts->orig_len); 743 744 return len 745 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 746 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 747 + nla_total_size(8); /* OVS_FLOW_ATTR_USED */ 748 } 749 750 /* Called with ovs_mutex or RCU read lock. */ 751 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 752 struct sk_buff *skb) 753 { 754 struct ovs_flow_stats stats; 755 __be16 tcp_flags; 756 unsigned long used; 757 758 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 759 760 if (used && 761 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used))) 762 return -EMSGSIZE; 763 764 if (stats.n_packets && 765 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats)) 766 return -EMSGSIZE; 767 768 if ((u8)ntohs(tcp_flags) && 769 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 770 return -EMSGSIZE; 771 772 return 0; 773 } 774 775 /* Called with ovs_mutex or RCU read lock. */ 776 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 777 struct sk_buff *skb, int skb_orig_len) 778 { 779 struct nlattr *start; 780 int err; 781 782 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 783 * this is the first flow to be dumped into 'skb'. This is unusual for 784 * Netlink but individual action lists can be longer than 785 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 786 * The userspace caller can always fetch the actions separately if it 787 * really wants them. (Most userspace callers in fact don't care.) 788 * 789 * This can only fail for dump operations because the skb is always 790 * properly sized for single flows. 791 */ 792 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS); 793 if (start) { 794 const struct sw_flow_actions *sf_acts; 795 796 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 797 err = ovs_nla_put_actions(sf_acts->actions, 798 sf_acts->actions_len, skb); 799 800 if (!err) 801 nla_nest_end(skb, start); 802 else { 803 if (skb_orig_len) 804 return err; 805 806 nla_nest_cancel(skb, start); 807 } 808 } else if (skb_orig_len) { 809 return -EMSGSIZE; 810 } 811 812 return 0; 813 } 814 815 /* Called with ovs_mutex or RCU read lock. */ 816 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 817 struct sk_buff *skb, u32 portid, 818 u32 seq, u32 flags, u8 cmd, u32 ufid_flags) 819 { 820 const int skb_orig_len = skb->len; 821 struct ovs_header *ovs_header; 822 int err; 823 824 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 825 flags, cmd); 826 if (!ovs_header) 827 return -EMSGSIZE; 828 829 ovs_header->dp_ifindex = dp_ifindex; 830 831 err = ovs_nla_put_identifier(flow, skb); 832 if (err) 833 goto error; 834 835 if (should_fill_key(&flow->id, ufid_flags)) { 836 err = ovs_nla_put_masked_key(flow, skb); 837 if (err) 838 goto error; 839 } 840 841 if (should_fill_mask(ufid_flags)) { 842 err = ovs_nla_put_mask(flow, skb); 843 if (err) 844 goto error; 845 } 846 847 err = ovs_flow_cmd_fill_stats(flow, skb); 848 if (err) 849 goto error; 850 851 if (should_fill_actions(ufid_flags)) { 852 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 853 if (err) 854 goto error; 855 } 856 857 genlmsg_end(skb, ovs_header); 858 return 0; 859 860 error: 861 genlmsg_cancel(skb, ovs_header); 862 return err; 863 } 864 865 /* May not be called with RCU read lock. */ 866 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 867 const struct sw_flow_id *sfid, 868 struct genl_info *info, 869 bool always, 870 uint32_t ufid_flags) 871 { 872 struct sk_buff *skb; 873 size_t len; 874 875 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 876 return NULL; 877 878 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); 879 skb = genlmsg_new_unicast(len, info, GFP_KERNEL); 880 if (!skb) 881 return ERR_PTR(-ENOMEM); 882 883 return skb; 884 } 885 886 /* Called with ovs_mutex. */ 887 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 888 int dp_ifindex, 889 struct genl_info *info, u8 cmd, 890 bool always, u32 ufid_flags) 891 { 892 struct sk_buff *skb; 893 int retval; 894 895 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), 896 &flow->id, info, always, ufid_flags); 897 if (IS_ERR_OR_NULL(skb)) 898 return skb; 899 900 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 901 info->snd_portid, info->snd_seq, 0, 902 cmd, ufid_flags); 903 BUG_ON(retval < 0); 904 return skb; 905 } 906 907 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 908 { 909 struct net *net = sock_net(skb->sk); 910 struct nlattr **a = info->attrs; 911 struct ovs_header *ovs_header = info->userhdr; 912 struct sw_flow *flow = NULL, *new_flow; 913 struct sw_flow_mask mask; 914 struct sk_buff *reply; 915 struct datapath *dp; 916 struct sw_flow_key key; 917 struct sw_flow_actions *acts; 918 struct sw_flow_match match; 919 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 920 int error; 921 bool log = !a[OVS_FLOW_ATTR_PROBE]; 922 923 /* Must have key and actions. */ 924 error = -EINVAL; 925 if (!a[OVS_FLOW_ATTR_KEY]) { 926 OVS_NLERR(log, "Flow key attr not present in new flow."); 927 goto error; 928 } 929 if (!a[OVS_FLOW_ATTR_ACTIONS]) { 930 OVS_NLERR(log, "Flow actions attr not present in new flow."); 931 goto error; 932 } 933 934 /* Most of the time we need to allocate a new flow, do it before 935 * locking. 936 */ 937 new_flow = ovs_flow_alloc(); 938 if (IS_ERR(new_flow)) { 939 error = PTR_ERR(new_flow); 940 goto error; 941 } 942 943 /* Extract key. */ 944 ovs_match_init(&match, &key, &mask); 945 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 946 a[OVS_FLOW_ATTR_MASK], log); 947 if (error) 948 goto err_kfree_flow; 949 950 ovs_flow_mask_key(&new_flow->key, &key, true, &mask); 951 952 /* Extract flow identifier. */ 953 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID], 954 &key, log); 955 if (error) 956 goto err_kfree_flow; 957 958 /* Validate actions. */ 959 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS], 960 &new_flow->key, &acts, log); 961 if (error) { 962 OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); 963 goto err_kfree_flow; 964 } 965 966 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false, 967 ufid_flags); 968 if (IS_ERR(reply)) { 969 error = PTR_ERR(reply); 970 goto err_kfree_acts; 971 } 972 973 ovs_lock(); 974 dp = get_dp(net, ovs_header->dp_ifindex); 975 if (unlikely(!dp)) { 976 error = -ENODEV; 977 goto err_unlock_ovs; 978 } 979 980 /* Check if this is a duplicate flow */ 981 if (ovs_identifier_is_ufid(&new_flow->id)) 982 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id); 983 if (!flow) 984 flow = ovs_flow_tbl_lookup(&dp->table, &key); 985 if (likely(!flow)) { 986 rcu_assign_pointer(new_flow->sf_acts, acts); 987 988 /* Put flow in bucket. */ 989 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 990 if (unlikely(error)) { 991 acts = NULL; 992 goto err_unlock_ovs; 993 } 994 995 if (unlikely(reply)) { 996 error = ovs_flow_cmd_fill_info(new_flow, 997 ovs_header->dp_ifindex, 998 reply, info->snd_portid, 999 info->snd_seq, 0, 1000 OVS_FLOW_CMD_NEW, 1001 ufid_flags); 1002 BUG_ON(error < 0); 1003 } 1004 ovs_unlock(); 1005 } else { 1006 struct sw_flow_actions *old_acts; 1007 1008 /* Bail out if we're not allowed to modify an existing flow. 1009 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 1010 * because Generic Netlink treats the latter as a dump 1011 * request. We also accept NLM_F_EXCL in case that bug ever 1012 * gets fixed. 1013 */ 1014 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 1015 | NLM_F_EXCL))) { 1016 error = -EEXIST; 1017 goto err_unlock_ovs; 1018 } 1019 /* The flow identifier has to be the same for flow updates. 1020 * Look for any overlapping flow. 1021 */ 1022 if (unlikely(!ovs_flow_cmp(flow, &match))) { 1023 if (ovs_identifier_is_key(&flow->id)) 1024 flow = ovs_flow_tbl_lookup_exact(&dp->table, 1025 &match); 1026 else /* UFID matches but key is different */ 1027 flow = NULL; 1028 if (!flow) { 1029 error = -ENOENT; 1030 goto err_unlock_ovs; 1031 } 1032 } 1033 /* Update actions. */ 1034 old_acts = ovsl_dereference(flow->sf_acts); 1035 rcu_assign_pointer(flow->sf_acts, acts); 1036 1037 if (unlikely(reply)) { 1038 error = ovs_flow_cmd_fill_info(flow, 1039 ovs_header->dp_ifindex, 1040 reply, info->snd_portid, 1041 info->snd_seq, 0, 1042 OVS_FLOW_CMD_NEW, 1043 ufid_flags); 1044 BUG_ON(error < 0); 1045 } 1046 ovs_unlock(); 1047 1048 ovs_nla_free_flow_actions_rcu(old_acts); 1049 ovs_flow_free(new_flow, false); 1050 } 1051 1052 if (reply) 1053 ovs_notify(&dp_flow_genl_family, reply, info); 1054 return 0; 1055 1056 err_unlock_ovs: 1057 ovs_unlock(); 1058 kfree_skb(reply); 1059 err_kfree_acts: 1060 ovs_nla_free_flow_actions(acts); 1061 err_kfree_flow: 1062 ovs_flow_free(new_flow, false); 1063 error: 1064 return error; 1065 } 1066 1067 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ 1068 static struct sw_flow_actions *get_flow_actions(struct net *net, 1069 const struct nlattr *a, 1070 const struct sw_flow_key *key, 1071 const struct sw_flow_mask *mask, 1072 bool log) 1073 { 1074 struct sw_flow_actions *acts; 1075 struct sw_flow_key masked_key; 1076 int error; 1077 1078 ovs_flow_mask_key(&masked_key, key, true, mask); 1079 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log); 1080 if (error) { 1081 OVS_NLERR(log, 1082 "Actions may not be safe on all matching packets"); 1083 return ERR_PTR(error); 1084 } 1085 1086 return acts; 1087 } 1088 1089 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 1090 { 1091 struct net *net = sock_net(skb->sk); 1092 struct nlattr **a = info->attrs; 1093 struct ovs_header *ovs_header = info->userhdr; 1094 struct sw_flow_key key; 1095 struct sw_flow *flow; 1096 struct sw_flow_mask mask; 1097 struct sk_buff *reply = NULL; 1098 struct datapath *dp; 1099 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 1100 struct sw_flow_match match; 1101 struct sw_flow_id sfid; 1102 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1103 int error; 1104 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1105 bool ufid_present; 1106 1107 /* Extract key. */ 1108 error = -EINVAL; 1109 if (!a[OVS_FLOW_ATTR_KEY]) { 1110 OVS_NLERR(log, "Flow key attribute not present in set flow."); 1111 goto error; 1112 } 1113 1114 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); 1115 ovs_match_init(&match, &key, &mask); 1116 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1117 a[OVS_FLOW_ATTR_MASK], log); 1118 if (error) 1119 goto error; 1120 1121 /* Validate actions. */ 1122 if (a[OVS_FLOW_ATTR_ACTIONS]) { 1123 acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key, 1124 &mask, log); 1125 if (IS_ERR(acts)) { 1126 error = PTR_ERR(acts); 1127 goto error; 1128 } 1129 1130 /* Can allocate before locking if have acts. */ 1131 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false, 1132 ufid_flags); 1133 if (IS_ERR(reply)) { 1134 error = PTR_ERR(reply); 1135 goto err_kfree_acts; 1136 } 1137 } 1138 1139 ovs_lock(); 1140 dp = get_dp(net, ovs_header->dp_ifindex); 1141 if (unlikely(!dp)) { 1142 error = -ENODEV; 1143 goto err_unlock_ovs; 1144 } 1145 /* Check that the flow exists. */ 1146 if (ufid_present) 1147 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid); 1148 else 1149 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1150 if (unlikely(!flow)) { 1151 error = -ENOENT; 1152 goto err_unlock_ovs; 1153 } 1154 1155 /* Update actions, if present. */ 1156 if (likely(acts)) { 1157 old_acts = ovsl_dereference(flow->sf_acts); 1158 rcu_assign_pointer(flow->sf_acts, acts); 1159 1160 if (unlikely(reply)) { 1161 error = ovs_flow_cmd_fill_info(flow, 1162 ovs_header->dp_ifindex, 1163 reply, info->snd_portid, 1164 info->snd_seq, 0, 1165 OVS_FLOW_CMD_NEW, 1166 ufid_flags); 1167 BUG_ON(error < 0); 1168 } 1169 } else { 1170 /* Could not alloc without acts before locking. */ 1171 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1172 info, OVS_FLOW_CMD_NEW, false, 1173 ufid_flags); 1174 1175 if (IS_ERR(reply)) { 1176 error = PTR_ERR(reply); 1177 goto err_unlock_ovs; 1178 } 1179 } 1180 1181 /* Clear stats. */ 1182 if (a[OVS_FLOW_ATTR_CLEAR]) 1183 ovs_flow_stats_clear(flow); 1184 ovs_unlock(); 1185 1186 if (reply) 1187 ovs_notify(&dp_flow_genl_family, reply, info); 1188 if (old_acts) 1189 ovs_nla_free_flow_actions_rcu(old_acts); 1190 1191 return 0; 1192 1193 err_unlock_ovs: 1194 ovs_unlock(); 1195 kfree_skb(reply); 1196 err_kfree_acts: 1197 ovs_nla_free_flow_actions(acts); 1198 error: 1199 return error; 1200 } 1201 1202 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1203 { 1204 struct nlattr **a = info->attrs; 1205 struct ovs_header *ovs_header = info->userhdr; 1206 struct net *net = sock_net(skb->sk); 1207 struct sw_flow_key key; 1208 struct sk_buff *reply; 1209 struct sw_flow *flow; 1210 struct datapath *dp; 1211 struct sw_flow_match match; 1212 struct sw_flow_id ufid; 1213 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1214 int err = 0; 1215 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1216 bool ufid_present; 1217 1218 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1219 if (a[OVS_FLOW_ATTR_KEY]) { 1220 ovs_match_init(&match, &key, NULL); 1221 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL, 1222 log); 1223 } else if (!ufid_present) { 1224 OVS_NLERR(log, 1225 "Flow get message rejected, Key attribute missing."); 1226 err = -EINVAL; 1227 } 1228 if (err) 1229 return err; 1230 1231 ovs_lock(); 1232 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1233 if (!dp) { 1234 err = -ENODEV; 1235 goto unlock; 1236 } 1237 1238 if (ufid_present) 1239 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1240 else 1241 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1242 if (!flow) { 1243 err = -ENOENT; 1244 goto unlock; 1245 } 1246 1247 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1248 OVS_FLOW_CMD_NEW, true, ufid_flags); 1249 if (IS_ERR(reply)) { 1250 err = PTR_ERR(reply); 1251 goto unlock; 1252 } 1253 1254 ovs_unlock(); 1255 return genlmsg_reply(reply, info); 1256 unlock: 1257 ovs_unlock(); 1258 return err; 1259 } 1260 1261 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1262 { 1263 struct nlattr **a = info->attrs; 1264 struct ovs_header *ovs_header = info->userhdr; 1265 struct net *net = sock_net(skb->sk); 1266 struct sw_flow_key key; 1267 struct sk_buff *reply; 1268 struct sw_flow *flow = NULL; 1269 struct datapath *dp; 1270 struct sw_flow_match match; 1271 struct sw_flow_id ufid; 1272 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1273 int err; 1274 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1275 bool ufid_present; 1276 1277 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1278 if (a[OVS_FLOW_ATTR_KEY]) { 1279 ovs_match_init(&match, &key, NULL); 1280 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1281 NULL, log); 1282 if (unlikely(err)) 1283 return err; 1284 } 1285 1286 ovs_lock(); 1287 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1288 if (unlikely(!dp)) { 1289 err = -ENODEV; 1290 goto unlock; 1291 } 1292 1293 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) { 1294 err = ovs_flow_tbl_flush(&dp->table); 1295 goto unlock; 1296 } 1297 1298 if (ufid_present) 1299 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1300 else 1301 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1302 if (unlikely(!flow)) { 1303 err = -ENOENT; 1304 goto unlock; 1305 } 1306 1307 ovs_flow_tbl_remove(&dp->table, flow); 1308 ovs_unlock(); 1309 1310 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1311 &flow->id, info, false, ufid_flags); 1312 if (likely(reply)) { 1313 if (likely(!IS_ERR(reply))) { 1314 rcu_read_lock(); /*To keep RCU checker happy. */ 1315 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1316 reply, info->snd_portid, 1317 info->snd_seq, 0, 1318 OVS_FLOW_CMD_DEL, 1319 ufid_flags); 1320 rcu_read_unlock(); 1321 BUG_ON(err < 0); 1322 1323 ovs_notify(&dp_flow_genl_family, reply, info); 1324 } else { 1325 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply)); 1326 } 1327 } 1328 1329 ovs_flow_free(flow, true); 1330 return 0; 1331 unlock: 1332 ovs_unlock(); 1333 return err; 1334 } 1335 1336 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1337 { 1338 struct nlattr *a[__OVS_FLOW_ATTR_MAX]; 1339 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1340 struct table_instance *ti; 1341 struct datapath *dp; 1342 u32 ufid_flags; 1343 int err; 1344 1345 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a, 1346 OVS_FLOW_ATTR_MAX, flow_policy); 1347 if (err) 1348 return err; 1349 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1350 1351 rcu_read_lock(); 1352 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1353 if (!dp) { 1354 rcu_read_unlock(); 1355 return -ENODEV; 1356 } 1357 1358 ti = rcu_dereference(dp->table.ti); 1359 for (;;) { 1360 struct sw_flow *flow; 1361 u32 bucket, obj; 1362 1363 bucket = cb->args[0]; 1364 obj = cb->args[1]; 1365 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1366 if (!flow) 1367 break; 1368 1369 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1370 NETLINK_CB(cb->skb).portid, 1371 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1372 OVS_FLOW_CMD_NEW, ufid_flags) < 0) 1373 break; 1374 1375 cb->args[0] = bucket; 1376 cb->args[1] = obj; 1377 } 1378 rcu_read_unlock(); 1379 return skb->len; 1380 } 1381 1382 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1383 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1384 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1385 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1386 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1387 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1388 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, 1389 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, 1390 }; 1391 1392 static const struct genl_ops dp_flow_genl_ops[] = { 1393 { .cmd = OVS_FLOW_CMD_NEW, 1394 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1395 .policy = flow_policy, 1396 .doit = ovs_flow_cmd_new 1397 }, 1398 { .cmd = OVS_FLOW_CMD_DEL, 1399 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1400 .policy = flow_policy, 1401 .doit = ovs_flow_cmd_del 1402 }, 1403 { .cmd = OVS_FLOW_CMD_GET, 1404 .flags = 0, /* OK for unprivileged users. */ 1405 .policy = flow_policy, 1406 .doit = ovs_flow_cmd_get, 1407 .dumpit = ovs_flow_cmd_dump 1408 }, 1409 { .cmd = OVS_FLOW_CMD_SET, 1410 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1411 .policy = flow_policy, 1412 .doit = ovs_flow_cmd_set, 1413 }, 1414 }; 1415 1416 static struct genl_family dp_flow_genl_family = { 1417 .id = GENL_ID_GENERATE, 1418 .hdrsize = sizeof(struct ovs_header), 1419 .name = OVS_FLOW_FAMILY, 1420 .version = OVS_FLOW_VERSION, 1421 .maxattr = OVS_FLOW_ATTR_MAX, 1422 .netnsok = true, 1423 .parallel_ops = true, 1424 .ops = dp_flow_genl_ops, 1425 .n_ops = ARRAY_SIZE(dp_flow_genl_ops), 1426 .mcgrps = &ovs_dp_flow_multicast_group, 1427 .n_mcgrps = 1, 1428 }; 1429 1430 static size_t ovs_dp_cmd_msg_size(void) 1431 { 1432 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1433 1434 msgsize += nla_total_size(IFNAMSIZ); 1435 msgsize += nla_total_size(sizeof(struct ovs_dp_stats)); 1436 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats)); 1437 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1438 1439 return msgsize; 1440 } 1441 1442 /* Called with ovs_mutex. */ 1443 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1444 u32 portid, u32 seq, u32 flags, u8 cmd) 1445 { 1446 struct ovs_header *ovs_header; 1447 struct ovs_dp_stats dp_stats; 1448 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1449 int err; 1450 1451 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1452 flags, cmd); 1453 if (!ovs_header) 1454 goto error; 1455 1456 ovs_header->dp_ifindex = get_dpifindex(dp); 1457 1458 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1459 if (err) 1460 goto nla_put_failure; 1461 1462 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1463 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1464 &dp_stats)) 1465 goto nla_put_failure; 1466 1467 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1468 sizeof(struct ovs_dp_megaflow_stats), 1469 &dp_megaflow_stats)) 1470 goto nla_put_failure; 1471 1472 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1473 goto nla_put_failure; 1474 1475 genlmsg_end(skb, ovs_header); 1476 return 0; 1477 1478 nla_put_failure: 1479 genlmsg_cancel(skb, ovs_header); 1480 error: 1481 return -EMSGSIZE; 1482 } 1483 1484 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info) 1485 { 1486 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL); 1487 } 1488 1489 /* Called with rcu_read_lock or ovs_mutex. */ 1490 static struct datapath *lookup_datapath(struct net *net, 1491 const struct ovs_header *ovs_header, 1492 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1493 { 1494 struct datapath *dp; 1495 1496 if (!a[OVS_DP_ATTR_NAME]) 1497 dp = get_dp(net, ovs_header->dp_ifindex); 1498 else { 1499 struct vport *vport; 1500 1501 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1502 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1503 } 1504 return dp ? dp : ERR_PTR(-ENODEV); 1505 } 1506 1507 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info) 1508 { 1509 struct datapath *dp; 1510 1511 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1512 if (IS_ERR(dp)) 1513 return; 1514 1515 WARN(dp->user_features, "Dropping previously announced user features\n"); 1516 dp->user_features = 0; 1517 } 1518 1519 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1520 { 1521 if (a[OVS_DP_ATTR_USER_FEATURES]) 1522 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1523 } 1524 1525 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1526 { 1527 struct nlattr **a = info->attrs; 1528 struct vport_parms parms; 1529 struct sk_buff *reply; 1530 struct datapath *dp; 1531 struct vport *vport; 1532 struct ovs_net *ovs_net; 1533 int err, i; 1534 1535 err = -EINVAL; 1536 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1537 goto err; 1538 1539 reply = ovs_dp_cmd_alloc_info(info); 1540 if (!reply) 1541 return -ENOMEM; 1542 1543 err = -ENOMEM; 1544 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1545 if (dp == NULL) 1546 goto err_free_reply; 1547 1548 ovs_dp_set_net(dp, sock_net(skb->sk)); 1549 1550 /* Allocate table. */ 1551 err = ovs_flow_tbl_init(&dp->table); 1552 if (err) 1553 goto err_free_dp; 1554 1555 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1556 if (!dp->stats_percpu) { 1557 err = -ENOMEM; 1558 goto err_destroy_table; 1559 } 1560 1561 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head), 1562 GFP_KERNEL); 1563 if (!dp->ports) { 1564 err = -ENOMEM; 1565 goto err_destroy_percpu; 1566 } 1567 1568 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1569 INIT_HLIST_HEAD(&dp->ports[i]); 1570 1571 /* Set up our datapath device. */ 1572 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1573 parms.type = OVS_VPORT_TYPE_INTERNAL; 1574 parms.options = NULL; 1575 parms.dp = dp; 1576 parms.port_no = OVSP_LOCAL; 1577 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1578 1579 ovs_dp_change(dp, a); 1580 1581 /* So far only local changes have been made, now need the lock. */ 1582 ovs_lock(); 1583 1584 vport = new_vport(&parms); 1585 if (IS_ERR(vport)) { 1586 err = PTR_ERR(vport); 1587 if (err == -EBUSY) 1588 err = -EEXIST; 1589 1590 if (err == -EEXIST) { 1591 /* An outdated user space instance that does not understand 1592 * the concept of user_features has attempted to create a new 1593 * datapath and is likely to reuse it. Drop all user features. 1594 */ 1595 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1596 ovs_dp_reset_user_features(skb, info); 1597 } 1598 1599 goto err_destroy_ports_array; 1600 } 1601 1602 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1603 info->snd_seq, 0, OVS_DP_CMD_NEW); 1604 BUG_ON(err < 0); 1605 1606 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1607 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1608 1609 ovs_unlock(); 1610 1611 ovs_notify(&dp_datapath_genl_family, reply, info); 1612 return 0; 1613 1614 err_destroy_ports_array: 1615 ovs_unlock(); 1616 kfree(dp->ports); 1617 err_destroy_percpu: 1618 free_percpu(dp->stats_percpu); 1619 err_destroy_table: 1620 ovs_flow_tbl_destroy(&dp->table); 1621 err_free_dp: 1622 kfree(dp); 1623 err_free_reply: 1624 kfree_skb(reply); 1625 err: 1626 return err; 1627 } 1628 1629 /* Called with ovs_mutex. */ 1630 static void __dp_destroy(struct datapath *dp) 1631 { 1632 int i; 1633 1634 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1635 struct vport *vport; 1636 struct hlist_node *n; 1637 1638 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1639 if (vport->port_no != OVSP_LOCAL) 1640 ovs_dp_detach_port(vport); 1641 } 1642 1643 list_del_rcu(&dp->list_node); 1644 1645 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1646 * all ports in datapath are destroyed first before freeing datapath. 1647 */ 1648 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1649 1650 /* RCU destroy the flow table */ 1651 call_rcu(&dp->rcu, destroy_dp_rcu); 1652 } 1653 1654 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1655 { 1656 struct sk_buff *reply; 1657 struct datapath *dp; 1658 int err; 1659 1660 reply = ovs_dp_cmd_alloc_info(info); 1661 if (!reply) 1662 return -ENOMEM; 1663 1664 ovs_lock(); 1665 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1666 err = PTR_ERR(dp); 1667 if (IS_ERR(dp)) 1668 goto err_unlock_free; 1669 1670 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1671 info->snd_seq, 0, OVS_DP_CMD_DEL); 1672 BUG_ON(err < 0); 1673 1674 __dp_destroy(dp); 1675 ovs_unlock(); 1676 1677 ovs_notify(&dp_datapath_genl_family, reply, info); 1678 1679 return 0; 1680 1681 err_unlock_free: 1682 ovs_unlock(); 1683 kfree_skb(reply); 1684 return err; 1685 } 1686 1687 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1688 { 1689 struct sk_buff *reply; 1690 struct datapath *dp; 1691 int err; 1692 1693 reply = ovs_dp_cmd_alloc_info(info); 1694 if (!reply) 1695 return -ENOMEM; 1696 1697 ovs_lock(); 1698 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1699 err = PTR_ERR(dp); 1700 if (IS_ERR(dp)) 1701 goto err_unlock_free; 1702 1703 ovs_dp_change(dp, info->attrs); 1704 1705 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1706 info->snd_seq, 0, OVS_DP_CMD_NEW); 1707 BUG_ON(err < 0); 1708 1709 ovs_unlock(); 1710 ovs_notify(&dp_datapath_genl_family, reply, info); 1711 1712 return 0; 1713 1714 err_unlock_free: 1715 ovs_unlock(); 1716 kfree_skb(reply); 1717 return err; 1718 } 1719 1720 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1721 { 1722 struct sk_buff *reply; 1723 struct datapath *dp; 1724 int err; 1725 1726 reply = ovs_dp_cmd_alloc_info(info); 1727 if (!reply) 1728 return -ENOMEM; 1729 1730 ovs_lock(); 1731 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1732 if (IS_ERR(dp)) { 1733 err = PTR_ERR(dp); 1734 goto err_unlock_free; 1735 } 1736 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1737 info->snd_seq, 0, OVS_DP_CMD_NEW); 1738 BUG_ON(err < 0); 1739 ovs_unlock(); 1740 1741 return genlmsg_reply(reply, info); 1742 1743 err_unlock_free: 1744 ovs_unlock(); 1745 kfree_skb(reply); 1746 return err; 1747 } 1748 1749 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1750 { 1751 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1752 struct datapath *dp; 1753 int skip = cb->args[0]; 1754 int i = 0; 1755 1756 ovs_lock(); 1757 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1758 if (i >= skip && 1759 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1760 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1761 OVS_DP_CMD_NEW) < 0) 1762 break; 1763 i++; 1764 } 1765 ovs_unlock(); 1766 1767 cb->args[0] = i; 1768 1769 return skb->len; 1770 } 1771 1772 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1773 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1774 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1775 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1776 }; 1777 1778 static const struct genl_ops dp_datapath_genl_ops[] = { 1779 { .cmd = OVS_DP_CMD_NEW, 1780 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1781 .policy = datapath_policy, 1782 .doit = ovs_dp_cmd_new 1783 }, 1784 { .cmd = OVS_DP_CMD_DEL, 1785 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1786 .policy = datapath_policy, 1787 .doit = ovs_dp_cmd_del 1788 }, 1789 { .cmd = OVS_DP_CMD_GET, 1790 .flags = 0, /* OK for unprivileged users. */ 1791 .policy = datapath_policy, 1792 .doit = ovs_dp_cmd_get, 1793 .dumpit = ovs_dp_cmd_dump 1794 }, 1795 { .cmd = OVS_DP_CMD_SET, 1796 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1797 .policy = datapath_policy, 1798 .doit = ovs_dp_cmd_set, 1799 }, 1800 }; 1801 1802 static struct genl_family dp_datapath_genl_family = { 1803 .id = GENL_ID_GENERATE, 1804 .hdrsize = sizeof(struct ovs_header), 1805 .name = OVS_DATAPATH_FAMILY, 1806 .version = OVS_DATAPATH_VERSION, 1807 .maxattr = OVS_DP_ATTR_MAX, 1808 .netnsok = true, 1809 .parallel_ops = true, 1810 .ops = dp_datapath_genl_ops, 1811 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops), 1812 .mcgrps = &ovs_dp_datapath_multicast_group, 1813 .n_mcgrps = 1, 1814 }; 1815 1816 /* Called with ovs_mutex or RCU read lock. */ 1817 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1818 u32 portid, u32 seq, u32 flags, u8 cmd) 1819 { 1820 struct ovs_header *ovs_header; 1821 struct ovs_vport_stats vport_stats; 1822 int err; 1823 1824 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1825 flags, cmd); 1826 if (!ovs_header) 1827 return -EMSGSIZE; 1828 1829 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1830 1831 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1832 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1833 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 1834 ovs_vport_name(vport))) 1835 goto nla_put_failure; 1836 1837 ovs_vport_get_stats(vport, &vport_stats); 1838 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), 1839 &vport_stats)) 1840 goto nla_put_failure; 1841 1842 if (ovs_vport_get_upcall_portids(vport, skb)) 1843 goto nla_put_failure; 1844 1845 err = ovs_vport_get_options(vport, skb); 1846 if (err == -EMSGSIZE) 1847 goto error; 1848 1849 genlmsg_end(skb, ovs_header); 1850 return 0; 1851 1852 nla_put_failure: 1853 err = -EMSGSIZE; 1854 error: 1855 genlmsg_cancel(skb, ovs_header); 1856 return err; 1857 } 1858 1859 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 1860 { 1861 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1862 } 1863 1864 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 1865 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid, 1866 u32 seq, u8 cmd) 1867 { 1868 struct sk_buff *skb; 1869 int retval; 1870 1871 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1872 if (!skb) 1873 return ERR_PTR(-ENOMEM); 1874 1875 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd); 1876 BUG_ON(retval < 0); 1877 1878 return skb; 1879 } 1880 1881 /* Called with ovs_mutex or RCU read lock. */ 1882 static struct vport *lookup_vport(struct net *net, 1883 const struct ovs_header *ovs_header, 1884 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1885 { 1886 struct datapath *dp; 1887 struct vport *vport; 1888 1889 if (a[OVS_VPORT_ATTR_NAME]) { 1890 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 1891 if (!vport) 1892 return ERR_PTR(-ENODEV); 1893 if (ovs_header->dp_ifindex && 1894 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 1895 return ERR_PTR(-ENODEV); 1896 return vport; 1897 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 1898 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1899 1900 if (port_no >= DP_MAX_PORTS) 1901 return ERR_PTR(-EFBIG); 1902 1903 dp = get_dp(net, ovs_header->dp_ifindex); 1904 if (!dp) 1905 return ERR_PTR(-ENODEV); 1906 1907 vport = ovs_vport_ovsl_rcu(dp, port_no); 1908 if (!vport) 1909 return ERR_PTR(-ENODEV); 1910 return vport; 1911 } else 1912 return ERR_PTR(-EINVAL); 1913 } 1914 1915 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 1916 { 1917 struct nlattr **a = info->attrs; 1918 struct ovs_header *ovs_header = info->userhdr; 1919 struct vport_parms parms; 1920 struct sk_buff *reply; 1921 struct vport *vport; 1922 struct datapath *dp; 1923 u32 port_no; 1924 int err; 1925 1926 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 1927 !a[OVS_VPORT_ATTR_UPCALL_PID]) 1928 return -EINVAL; 1929 1930 port_no = a[OVS_VPORT_ATTR_PORT_NO] 1931 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 1932 if (port_no >= DP_MAX_PORTS) 1933 return -EFBIG; 1934 1935 reply = ovs_vport_cmd_alloc_info(); 1936 if (!reply) 1937 return -ENOMEM; 1938 1939 ovs_lock(); 1940 restart: 1941 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1942 err = -ENODEV; 1943 if (!dp) 1944 goto exit_unlock_free; 1945 1946 if (port_no) { 1947 vport = ovs_vport_ovsl(dp, port_no); 1948 err = -EBUSY; 1949 if (vport) 1950 goto exit_unlock_free; 1951 } else { 1952 for (port_no = 1; ; port_no++) { 1953 if (port_no >= DP_MAX_PORTS) { 1954 err = -EFBIG; 1955 goto exit_unlock_free; 1956 } 1957 vport = ovs_vport_ovsl(dp, port_no); 1958 if (!vport) 1959 break; 1960 } 1961 } 1962 1963 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 1964 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 1965 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 1966 parms.dp = dp; 1967 parms.port_no = port_no; 1968 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 1969 1970 vport = new_vport(&parms); 1971 err = PTR_ERR(vport); 1972 if (IS_ERR(vport)) { 1973 if (err == -EAGAIN) 1974 goto restart; 1975 goto exit_unlock_free; 1976 } 1977 1978 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 1979 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 1980 BUG_ON(err < 0); 1981 ovs_unlock(); 1982 1983 ovs_notify(&dp_vport_genl_family, reply, info); 1984 return 0; 1985 1986 exit_unlock_free: 1987 ovs_unlock(); 1988 kfree_skb(reply); 1989 return err; 1990 } 1991 1992 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 1993 { 1994 struct nlattr **a = info->attrs; 1995 struct sk_buff *reply; 1996 struct vport *vport; 1997 int err; 1998 1999 reply = ovs_vport_cmd_alloc_info(); 2000 if (!reply) 2001 return -ENOMEM; 2002 2003 ovs_lock(); 2004 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2005 err = PTR_ERR(vport); 2006 if (IS_ERR(vport)) 2007 goto exit_unlock_free; 2008 2009 if (a[OVS_VPORT_ATTR_TYPE] && 2010 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 2011 err = -EINVAL; 2012 goto exit_unlock_free; 2013 } 2014 2015 if (a[OVS_VPORT_ATTR_OPTIONS]) { 2016 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 2017 if (err) 2018 goto exit_unlock_free; 2019 } 2020 2021 2022 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 2023 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2024 2025 err = ovs_vport_set_upcall_portids(vport, ids); 2026 if (err) 2027 goto exit_unlock_free; 2028 } 2029 2030 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 2031 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 2032 BUG_ON(err < 0); 2033 2034 ovs_unlock(); 2035 ovs_notify(&dp_vport_genl_family, reply, info); 2036 return 0; 2037 2038 exit_unlock_free: 2039 ovs_unlock(); 2040 kfree_skb(reply); 2041 return err; 2042 } 2043 2044 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2045 { 2046 struct nlattr **a = info->attrs; 2047 struct sk_buff *reply; 2048 struct vport *vport; 2049 int err; 2050 2051 reply = ovs_vport_cmd_alloc_info(); 2052 if (!reply) 2053 return -ENOMEM; 2054 2055 ovs_lock(); 2056 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2057 err = PTR_ERR(vport); 2058 if (IS_ERR(vport)) 2059 goto exit_unlock_free; 2060 2061 if (vport->port_no == OVSP_LOCAL) { 2062 err = -EINVAL; 2063 goto exit_unlock_free; 2064 } 2065 2066 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 2067 info->snd_seq, 0, OVS_VPORT_CMD_DEL); 2068 BUG_ON(err < 0); 2069 ovs_dp_detach_port(vport); 2070 ovs_unlock(); 2071 2072 ovs_notify(&dp_vport_genl_family, reply, info); 2073 return 0; 2074 2075 exit_unlock_free: 2076 ovs_unlock(); 2077 kfree_skb(reply); 2078 return err; 2079 } 2080 2081 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2082 { 2083 struct nlattr **a = info->attrs; 2084 struct ovs_header *ovs_header = info->userhdr; 2085 struct sk_buff *reply; 2086 struct vport *vport; 2087 int err; 2088 2089 reply = ovs_vport_cmd_alloc_info(); 2090 if (!reply) 2091 return -ENOMEM; 2092 2093 rcu_read_lock(); 2094 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2095 err = PTR_ERR(vport); 2096 if (IS_ERR(vport)) 2097 goto exit_unlock_free; 2098 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 2099 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 2100 BUG_ON(err < 0); 2101 rcu_read_unlock(); 2102 2103 return genlmsg_reply(reply, info); 2104 2105 exit_unlock_free: 2106 rcu_read_unlock(); 2107 kfree_skb(reply); 2108 return err; 2109 } 2110 2111 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2112 { 2113 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2114 struct datapath *dp; 2115 int bucket = cb->args[0], skip = cb->args[1]; 2116 int i, j = 0; 2117 2118 rcu_read_lock(); 2119 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2120 if (!dp) { 2121 rcu_read_unlock(); 2122 return -ENODEV; 2123 } 2124 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2125 struct vport *vport; 2126 2127 j = 0; 2128 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2129 if (j >= skip && 2130 ovs_vport_cmd_fill_info(vport, skb, 2131 NETLINK_CB(cb->skb).portid, 2132 cb->nlh->nlmsg_seq, 2133 NLM_F_MULTI, 2134 OVS_VPORT_CMD_NEW) < 0) 2135 goto out; 2136 2137 j++; 2138 } 2139 skip = 0; 2140 } 2141 out: 2142 rcu_read_unlock(); 2143 2144 cb->args[0] = i; 2145 cb->args[1] = j; 2146 2147 return skb->len; 2148 } 2149 2150 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2151 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2152 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2153 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2154 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2155 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 2156 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2157 }; 2158 2159 static const struct genl_ops dp_vport_genl_ops[] = { 2160 { .cmd = OVS_VPORT_CMD_NEW, 2161 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2162 .policy = vport_policy, 2163 .doit = ovs_vport_cmd_new 2164 }, 2165 { .cmd = OVS_VPORT_CMD_DEL, 2166 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2167 .policy = vport_policy, 2168 .doit = ovs_vport_cmd_del 2169 }, 2170 { .cmd = OVS_VPORT_CMD_GET, 2171 .flags = 0, /* OK for unprivileged users. */ 2172 .policy = vport_policy, 2173 .doit = ovs_vport_cmd_get, 2174 .dumpit = ovs_vport_cmd_dump 2175 }, 2176 { .cmd = OVS_VPORT_CMD_SET, 2177 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2178 .policy = vport_policy, 2179 .doit = ovs_vport_cmd_set, 2180 }, 2181 }; 2182 2183 struct genl_family dp_vport_genl_family = { 2184 .id = GENL_ID_GENERATE, 2185 .hdrsize = sizeof(struct ovs_header), 2186 .name = OVS_VPORT_FAMILY, 2187 .version = OVS_VPORT_VERSION, 2188 .maxattr = OVS_VPORT_ATTR_MAX, 2189 .netnsok = true, 2190 .parallel_ops = true, 2191 .ops = dp_vport_genl_ops, 2192 .n_ops = ARRAY_SIZE(dp_vport_genl_ops), 2193 .mcgrps = &ovs_dp_vport_multicast_group, 2194 .n_mcgrps = 1, 2195 }; 2196 2197 static struct genl_family * const dp_genl_families[] = { 2198 &dp_datapath_genl_family, 2199 &dp_vport_genl_family, 2200 &dp_flow_genl_family, 2201 &dp_packet_genl_family, 2202 }; 2203 2204 static void dp_unregister_genl(int n_families) 2205 { 2206 int i; 2207 2208 for (i = 0; i < n_families; i++) 2209 genl_unregister_family(dp_genl_families[i]); 2210 } 2211 2212 static int dp_register_genl(void) 2213 { 2214 int err; 2215 int i; 2216 2217 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2218 2219 err = genl_register_family(dp_genl_families[i]); 2220 if (err) 2221 goto error; 2222 } 2223 2224 return 0; 2225 2226 error: 2227 dp_unregister_genl(i); 2228 return err; 2229 } 2230 2231 static int __net_init ovs_init_net(struct net *net) 2232 { 2233 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2234 2235 INIT_LIST_HEAD(&ovs_net->dps); 2236 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2237 ovs_ct_init(net); 2238 return 0; 2239 } 2240 2241 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2242 struct list_head *head) 2243 { 2244 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2245 struct datapath *dp; 2246 2247 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2248 int i; 2249 2250 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2251 struct vport *vport; 2252 2253 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2254 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2255 continue; 2256 2257 if (dev_net(vport->dev) == dnet) 2258 list_add(&vport->detach_list, head); 2259 } 2260 } 2261 } 2262 } 2263 2264 static void __net_exit ovs_exit_net(struct net *dnet) 2265 { 2266 struct datapath *dp, *dp_next; 2267 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2268 struct vport *vport, *vport_next; 2269 struct net *net; 2270 LIST_HEAD(head); 2271 2272 ovs_ct_exit(dnet); 2273 ovs_lock(); 2274 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2275 __dp_destroy(dp); 2276 2277 rtnl_lock(); 2278 for_each_net(net) 2279 list_vports_from_net(net, dnet, &head); 2280 rtnl_unlock(); 2281 2282 /* Detach all vports from given namespace. */ 2283 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2284 list_del(&vport->detach_list); 2285 ovs_dp_detach_port(vport); 2286 } 2287 2288 ovs_unlock(); 2289 2290 cancel_work_sync(&ovs_net->dp_notify_work); 2291 } 2292 2293 static struct pernet_operations ovs_net_ops = { 2294 .init = ovs_init_net, 2295 .exit = ovs_exit_net, 2296 .id = &ovs_net_id, 2297 .size = sizeof(struct ovs_net), 2298 }; 2299 2300 static int __init dp_init(void) 2301 { 2302 int err; 2303 2304 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); 2305 2306 pr_info("Open vSwitch switching datapath\n"); 2307 2308 err = action_fifos_init(); 2309 if (err) 2310 goto error; 2311 2312 err = ovs_internal_dev_rtnl_link_register(); 2313 if (err) 2314 goto error_action_fifos_exit; 2315 2316 err = ovs_flow_init(); 2317 if (err) 2318 goto error_unreg_rtnl_link; 2319 2320 err = ovs_vport_init(); 2321 if (err) 2322 goto error_flow_exit; 2323 2324 err = register_pernet_device(&ovs_net_ops); 2325 if (err) 2326 goto error_vport_exit; 2327 2328 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2329 if (err) 2330 goto error_netns_exit; 2331 2332 err = ovs_netdev_init(); 2333 if (err) 2334 goto error_unreg_notifier; 2335 2336 err = dp_register_genl(); 2337 if (err < 0) 2338 goto error_unreg_netdev; 2339 2340 return 0; 2341 2342 error_unreg_netdev: 2343 ovs_netdev_exit(); 2344 error_unreg_notifier: 2345 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2346 error_netns_exit: 2347 unregister_pernet_device(&ovs_net_ops); 2348 error_vport_exit: 2349 ovs_vport_exit(); 2350 error_flow_exit: 2351 ovs_flow_exit(); 2352 error_unreg_rtnl_link: 2353 ovs_internal_dev_rtnl_link_unregister(); 2354 error_action_fifos_exit: 2355 action_fifos_exit(); 2356 error: 2357 return err; 2358 } 2359 2360 static void dp_cleanup(void) 2361 { 2362 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2363 ovs_netdev_exit(); 2364 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2365 unregister_pernet_device(&ovs_net_ops); 2366 rcu_barrier(); 2367 ovs_vport_exit(); 2368 ovs_flow_exit(); 2369 ovs_internal_dev_rtnl_link_unregister(); 2370 action_fifos_exit(); 2371 } 2372 2373 module_init(dp_init); 2374 module_exit(dp_cleanup); 2375 2376 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2377 MODULE_LICENSE("GPL"); 2378