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