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, genl_info_net(info), info->snd_portid, 95 0, info->nlhdr, GFP_KERNEL); 96 } 97 98 /** 99 * DOC: Locking: 100 * 101 * All writes e.g. Writes to device state (add/remove datapath, port, set 102 * operations on vports, etc.), Writes to other state (flow table 103 * modifications, set miscellaneous datapath parameters, etc.) are protected 104 * by ovs_lock. 105 * 106 * Reads are protected by RCU. 107 * 108 * There are a few special cases (mostly stats) that have their own 109 * synchronization but they nest under all of above and don't interact with 110 * each other. 111 * 112 * The RTNL lock nests inside ovs_mutex. 113 */ 114 115 static DEFINE_MUTEX(ovs_mutex); 116 117 void ovs_lock(void) 118 { 119 mutex_lock(&ovs_mutex); 120 } 121 122 void ovs_unlock(void) 123 { 124 mutex_unlock(&ovs_mutex); 125 } 126 127 #ifdef CONFIG_LOCKDEP 128 int lockdep_ovsl_is_held(void) 129 { 130 if (debug_locks) 131 return lockdep_is_held(&ovs_mutex); 132 else 133 return 1; 134 } 135 EXPORT_SYMBOL_GPL(lockdep_ovsl_is_held); 136 #endif 137 138 static struct vport *new_vport(const struct vport_parms *); 139 static int queue_gso_packets(struct datapath *dp, struct sk_buff *, 140 const struct sw_flow_key *, 141 const struct dp_upcall_info *); 142 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *, 143 const struct sw_flow_key *, 144 const struct dp_upcall_info *); 145 146 /* Must be called with rcu_read_lock. */ 147 static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex) 148 { 149 struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex); 150 151 if (dev) { 152 struct vport *vport = ovs_internal_dev_get_vport(dev); 153 if (vport) 154 return vport->dp; 155 } 156 157 return NULL; 158 } 159 160 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the 161 * returned dp pointer valid. 162 */ 163 static inline struct datapath *get_dp(struct net *net, int dp_ifindex) 164 { 165 struct datapath *dp; 166 167 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); 168 rcu_read_lock(); 169 dp = get_dp_rcu(net, dp_ifindex); 170 rcu_read_unlock(); 171 172 return dp; 173 } 174 175 /* Must be called with rcu_read_lock or ovs_mutex. */ 176 const char *ovs_dp_name(const struct datapath *dp) 177 { 178 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); 179 return ovs_vport_name(vport); 180 } 181 182 static int get_dpifindex(const struct datapath *dp) 183 { 184 struct vport *local; 185 int ifindex; 186 187 rcu_read_lock(); 188 189 local = ovs_vport_rcu(dp, OVSP_LOCAL); 190 if (local) 191 ifindex = local->dev->ifindex; 192 else 193 ifindex = 0; 194 195 rcu_read_unlock(); 196 197 return ifindex; 198 } 199 200 static void destroy_dp_rcu(struct rcu_head *rcu) 201 { 202 struct datapath *dp = container_of(rcu, struct datapath, rcu); 203 204 ovs_flow_tbl_destroy(&dp->table); 205 free_percpu(dp->stats_percpu); 206 kfree(dp->ports); 207 kfree(dp); 208 } 209 210 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 211 u16 port_no) 212 { 213 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 214 } 215 216 /* Called with ovs_mutex or RCU read lock. */ 217 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 218 { 219 struct vport *vport; 220 struct hlist_head *head; 221 222 head = vport_hash_bucket(dp, port_no); 223 hlist_for_each_entry_rcu(vport, head, dp_hash_node) { 224 if (vport->port_no == port_no) 225 return vport; 226 } 227 return NULL; 228 } 229 230 /* Called with ovs_mutex. */ 231 static struct vport *new_vport(const struct vport_parms *parms) 232 { 233 struct vport *vport; 234 235 vport = ovs_vport_add(parms); 236 if (!IS_ERR(vport)) { 237 struct datapath *dp = parms->dp; 238 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 239 240 hlist_add_head_rcu(&vport->dp_hash_node, head); 241 } 242 return vport; 243 } 244 245 void ovs_dp_detach_port(struct vport *p) 246 { 247 ASSERT_OVSL(); 248 249 /* First drop references to device. */ 250 hlist_del_rcu(&p->dp_hash_node); 251 252 /* Then destroy it. */ 253 ovs_vport_del(p); 254 } 255 256 /* Must be called with rcu_read_lock. */ 257 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key) 258 { 259 const struct vport *p = OVS_CB(skb)->input_vport; 260 struct datapath *dp = p->dp; 261 struct sw_flow *flow; 262 struct sw_flow_actions *sf_acts; 263 struct dp_stats_percpu *stats; 264 u64 *stats_counter; 265 u32 n_mask_hit; 266 267 stats = this_cpu_ptr(dp->stats_percpu); 268 269 /* Look up flow. */ 270 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit); 271 if (unlikely(!flow)) { 272 struct dp_upcall_info upcall; 273 int error; 274 275 memset(&upcall, 0, sizeof(upcall)); 276 upcall.cmd = OVS_PACKET_CMD_MISS; 277 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 278 upcall.mru = OVS_CB(skb)->mru; 279 error = ovs_dp_upcall(dp, skb, key, &upcall); 280 if (unlikely(error)) 281 kfree_skb(skb); 282 else 283 consume_skb(skb); 284 stats_counter = &stats->n_missed; 285 goto out; 286 } 287 288 ovs_flow_stats_update(flow, key->tp.flags, skb); 289 sf_acts = rcu_dereference(flow->sf_acts); 290 ovs_execute_actions(dp, skb, sf_acts, key); 291 292 stats_counter = &stats->n_hit; 293 294 out: 295 /* Update datapath statistics. */ 296 u64_stats_update_begin(&stats->syncp); 297 (*stats_counter)++; 298 stats->n_mask_hit += n_mask_hit; 299 u64_stats_update_end(&stats->syncp); 300 } 301 302 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 303 const struct sw_flow_key *key, 304 const struct dp_upcall_info *upcall_info) 305 { 306 struct dp_stats_percpu *stats; 307 int err; 308 309 if (upcall_info->portid == 0) { 310 err = -ENOTCONN; 311 goto err; 312 } 313 314 if (!skb_is_gso(skb)) 315 err = queue_userspace_packet(dp, skb, key, upcall_info); 316 else 317 err = queue_gso_packets(dp, skb, key, upcall_info); 318 if (err) 319 goto err; 320 321 return 0; 322 323 err: 324 stats = this_cpu_ptr(dp->stats_percpu); 325 326 u64_stats_update_begin(&stats->syncp); 327 stats->n_lost++; 328 u64_stats_update_end(&stats->syncp); 329 330 return err; 331 } 332 333 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 334 const struct sw_flow_key *key, 335 const struct dp_upcall_info *upcall_info) 336 { 337 unsigned short gso_type = skb_shinfo(skb)->gso_type; 338 struct sw_flow_key later_key; 339 struct sk_buff *segs, *nskb; 340 struct ovs_skb_cb ovs_cb; 341 int err; 342 343 ovs_cb = *OVS_CB(skb); 344 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 345 *OVS_CB(skb) = ovs_cb; 346 if (IS_ERR(segs)) 347 return PTR_ERR(segs); 348 if (segs == NULL) 349 return -EINVAL; 350 351 if (gso_type & SKB_GSO_UDP) { 352 /* The initial flow key extracted by ovs_flow_key_extract() 353 * in this case is for a first fragment, so we need to 354 * properly mark later fragments. 355 */ 356 later_key = *key; 357 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 358 } 359 360 /* Queue all of the segments. */ 361 skb = segs; 362 do { 363 *OVS_CB(skb) = ovs_cb; 364 if (gso_type & SKB_GSO_UDP && skb != segs) 365 key = &later_key; 366 367 err = queue_userspace_packet(dp, skb, key, upcall_info); 368 if (err) 369 break; 370 371 } while ((skb = skb->next)); 372 373 /* Free all of the segments. */ 374 skb = segs; 375 do { 376 nskb = skb->next; 377 if (err) 378 kfree_skb(skb); 379 else 380 consume_skb(skb); 381 } while ((skb = nskb)); 382 return err; 383 } 384 385 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, 386 unsigned int hdrlen) 387 { 388 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 389 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 390 + nla_total_size(ovs_key_attr_size()); /* OVS_PACKET_ATTR_KEY */ 391 392 /* OVS_PACKET_ATTR_USERDATA */ 393 if (upcall_info->userdata) 394 size += NLA_ALIGN(upcall_info->userdata->nla_len); 395 396 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ 397 if (upcall_info->egress_tun_info) 398 size += nla_total_size(ovs_tun_key_attr_size()); 399 400 /* OVS_PACKET_ATTR_ACTIONS */ 401 if (upcall_info->actions_len) 402 size += nla_total_size(upcall_info->actions_len); 403 404 /* OVS_PACKET_ATTR_MRU */ 405 if (upcall_info->mru) 406 size += nla_total_size(sizeof(upcall_info->mru)); 407 408 return size; 409 } 410 411 static void pad_packet(struct datapath *dp, struct sk_buff *skb) 412 { 413 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 414 size_t plen = NLA_ALIGN(skb->len) - skb->len; 415 416 if (plen > 0) 417 memset(skb_put(skb, plen), 0, plen); 418 } 419 } 420 421 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 422 const struct sw_flow_key *key, 423 const struct dp_upcall_info *upcall_info) 424 { 425 struct ovs_header *upcall; 426 struct sk_buff *nskb = NULL; 427 struct sk_buff *user_skb = NULL; /* to be queued to userspace */ 428 struct nlattr *nla; 429 struct genl_info info = { 430 .dst_sk = ovs_dp_get_net(dp)->genl_sock, 431 .snd_portid = upcall_info->portid, 432 }; 433 size_t len; 434 unsigned int hlen; 435 int err, dp_ifindex; 436 437 dp_ifindex = get_dpifindex(dp); 438 if (!dp_ifindex) 439 return -ENODEV; 440 441 if (skb_vlan_tag_present(skb)) { 442 nskb = skb_clone(skb, GFP_ATOMIC); 443 if (!nskb) 444 return -ENOMEM; 445 446 nskb = __vlan_hwaccel_push_inside(nskb); 447 if (!nskb) 448 return -ENOMEM; 449 450 skb = nskb; 451 } 452 453 if (nla_attr_size(skb->len) > USHRT_MAX) { 454 err = -EFBIG; 455 goto out; 456 } 457 458 /* Complete checksum if needed */ 459 if (skb->ip_summed == CHECKSUM_PARTIAL && 460 (err = skb_checksum_help(skb))) 461 goto out; 462 463 /* Older versions of OVS user space enforce alignment of the last 464 * Netlink attribute to NLA_ALIGNTO which would require extensive 465 * padding logic. Only perform zerocopy if padding is not required. 466 */ 467 if (dp->user_features & OVS_DP_F_UNALIGNED) 468 hlen = skb_zerocopy_headlen(skb); 469 else 470 hlen = skb->len; 471 472 len = upcall_msg_size(upcall_info, hlen); 473 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC); 474 if (!user_skb) { 475 err = -ENOMEM; 476 goto out; 477 } 478 479 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 480 0, upcall_info->cmd); 481 upcall->dp_ifindex = dp_ifindex; 482 483 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); 484 BUG_ON(err); 485 486 if (upcall_info->userdata) 487 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 488 nla_len(upcall_info->userdata), 489 nla_data(upcall_info->userdata)); 490 491 if (upcall_info->egress_tun_info) { 492 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY); 493 err = ovs_nla_put_tunnel_info(user_skb, 494 upcall_info->egress_tun_info); 495 BUG_ON(err); 496 nla_nest_end(user_skb, nla); 497 } 498 499 if (upcall_info->actions_len) { 500 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS); 501 err = ovs_nla_put_actions(upcall_info->actions, 502 upcall_info->actions_len, 503 user_skb); 504 if (!err) 505 nla_nest_end(user_skb, nla); 506 else 507 nla_nest_cancel(user_skb, nla); 508 } 509 510 /* Add OVS_PACKET_ATTR_MRU */ 511 if (upcall_info->mru) { 512 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, 513 upcall_info->mru)) { 514 err = -ENOBUFS; 515 goto out; 516 } 517 pad_packet(dp, user_skb); 518 } 519 520 /* Only reserve room for attribute header, packet data is added 521 * in skb_zerocopy() */ 522 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 523 err = -ENOBUFS; 524 goto out; 525 } 526 nla->nla_len = nla_attr_size(skb->len); 527 528 err = skb_zerocopy(user_skb, skb, skb->len, hlen); 529 if (err) 530 goto out; 531 532 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 533 pad_packet(dp, user_skb); 534 535 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 536 537 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 538 user_skb = NULL; 539 out: 540 if (err) 541 skb_tx_error(skb); 542 kfree_skb(user_skb); 543 kfree_skb(nskb); 544 return err; 545 } 546 547 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 548 { 549 struct ovs_header *ovs_header = info->userhdr; 550 struct net *net = sock_net(skb->sk); 551 struct nlattr **a = info->attrs; 552 struct sw_flow_actions *acts; 553 struct sk_buff *packet; 554 struct sw_flow *flow; 555 struct sw_flow_actions *sf_acts; 556 struct datapath *dp; 557 struct ethhdr *eth; 558 struct vport *input_vport; 559 u16 mru = 0; 560 int len; 561 int err; 562 bool log = !a[OVS_PACKET_ATTR_PROBE]; 563 564 err = -EINVAL; 565 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 566 !a[OVS_PACKET_ATTR_ACTIONS]) 567 goto err; 568 569 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 570 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 571 err = -ENOMEM; 572 if (!packet) 573 goto err; 574 skb_reserve(packet, NET_IP_ALIGN); 575 576 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 577 578 skb_reset_mac_header(packet); 579 eth = eth_hdr(packet); 580 581 /* Normally, setting the skb 'protocol' field would be handled by a 582 * call to eth_type_trans(), but it assumes there's a sending 583 * device, which we may not have. */ 584 if (eth_proto_is_802_3(eth->h_proto)) 585 packet->protocol = eth->h_proto; 586 else 587 packet->protocol = htons(ETH_P_802_2); 588 589 /* Set packet's mru */ 590 if (a[OVS_PACKET_ATTR_MRU]) { 591 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]); 592 packet->ignore_df = 1; 593 } 594 OVS_CB(packet)->mru = mru; 595 596 /* Build an sw_flow for sending this packet. */ 597 flow = ovs_flow_alloc(); 598 err = PTR_ERR(flow); 599 if (IS_ERR(flow)) 600 goto err_kfree_skb; 601 602 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY], 603 packet, &flow->key, log); 604 if (err) 605 goto err_flow_free; 606 607 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS], 608 &flow->key, &acts, log); 609 if (err) 610 goto err_flow_free; 611 612 rcu_assign_pointer(flow->sf_acts, acts); 613 packet->priority = flow->key.phy.priority; 614 packet->mark = flow->key.phy.skb_mark; 615 616 rcu_read_lock(); 617 dp = get_dp_rcu(net, ovs_header->dp_ifindex); 618 err = -ENODEV; 619 if (!dp) 620 goto err_unlock; 621 622 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 623 if (!input_vport) 624 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 625 626 if (!input_vport) 627 goto err_unlock; 628 629 packet->dev = input_vport->dev; 630 OVS_CB(packet)->input_vport = input_vport; 631 sf_acts = rcu_dereference(flow->sf_acts); 632 633 local_bh_disable(); 634 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); 635 local_bh_enable(); 636 rcu_read_unlock(); 637 638 ovs_flow_free(flow, false); 639 return err; 640 641 err_unlock: 642 rcu_read_unlock(); 643 err_flow_free: 644 ovs_flow_free(flow, false); 645 err_kfree_skb: 646 kfree_skb(packet); 647 err: 648 return err; 649 } 650 651 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 652 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 653 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 654 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 655 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, 656 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, 657 }; 658 659 static const struct genl_ops dp_packet_genl_ops[] = { 660 { .cmd = OVS_PACKET_CMD_EXECUTE, 661 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 662 .policy = packet_policy, 663 .doit = ovs_packet_cmd_execute 664 } 665 }; 666 667 static struct genl_family dp_packet_genl_family = { 668 .id = GENL_ID_GENERATE, 669 .hdrsize = sizeof(struct ovs_header), 670 .name = OVS_PACKET_FAMILY, 671 .version = OVS_PACKET_VERSION, 672 .maxattr = OVS_PACKET_ATTR_MAX, 673 .netnsok = true, 674 .parallel_ops = true, 675 .ops = dp_packet_genl_ops, 676 .n_ops = ARRAY_SIZE(dp_packet_genl_ops), 677 }; 678 679 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 680 struct ovs_dp_megaflow_stats *mega_stats) 681 { 682 int i; 683 684 memset(mega_stats, 0, sizeof(*mega_stats)); 685 686 stats->n_flows = ovs_flow_tbl_count(&dp->table); 687 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 688 689 stats->n_hit = stats->n_missed = stats->n_lost = 0; 690 691 for_each_possible_cpu(i) { 692 const struct dp_stats_percpu *percpu_stats; 693 struct dp_stats_percpu local_stats; 694 unsigned int start; 695 696 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 697 698 do { 699 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 700 local_stats = *percpu_stats; 701 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 702 703 stats->n_hit += local_stats.n_hit; 704 stats->n_missed += local_stats.n_missed; 705 stats->n_lost += local_stats.n_lost; 706 mega_stats->n_mask_hit += local_stats.n_mask_hit; 707 } 708 } 709 710 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) 711 { 712 return ovs_identifier_is_ufid(sfid) && 713 !(ufid_flags & OVS_UFID_F_OMIT_KEY); 714 } 715 716 static bool should_fill_mask(uint32_t ufid_flags) 717 { 718 return !(ufid_flags & OVS_UFID_F_OMIT_MASK); 719 } 720 721 static bool should_fill_actions(uint32_t ufid_flags) 722 { 723 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); 724 } 725 726 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, 727 const struct sw_flow_id *sfid, 728 uint32_t ufid_flags) 729 { 730 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); 731 732 /* OVS_FLOW_ATTR_UFID */ 733 if (sfid && ovs_identifier_is_ufid(sfid)) 734 len += nla_total_size(sfid->ufid_len); 735 736 /* OVS_FLOW_ATTR_KEY */ 737 if (!sfid || should_fill_key(sfid, ufid_flags)) 738 len += nla_total_size(ovs_key_attr_size()); 739 740 /* OVS_FLOW_ATTR_MASK */ 741 if (should_fill_mask(ufid_flags)) 742 len += nla_total_size(ovs_key_attr_size()); 743 744 /* OVS_FLOW_ATTR_ACTIONS */ 745 if (should_fill_actions(ufid_flags)) 746 len += nla_total_size(acts->orig_len); 747 748 return len 749 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 750 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 751 + nla_total_size(8); /* OVS_FLOW_ATTR_USED */ 752 } 753 754 /* Called with ovs_mutex or RCU read lock. */ 755 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 756 struct sk_buff *skb) 757 { 758 struct ovs_flow_stats stats; 759 __be16 tcp_flags; 760 unsigned long used; 761 762 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 763 764 if (used && 765 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used))) 766 return -EMSGSIZE; 767 768 if (stats.n_packets && 769 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats)) 770 return -EMSGSIZE; 771 772 if ((u8)ntohs(tcp_flags) && 773 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 774 return -EMSGSIZE; 775 776 return 0; 777 } 778 779 /* Called with ovs_mutex or RCU read lock. */ 780 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 781 struct sk_buff *skb, int skb_orig_len) 782 { 783 struct nlattr *start; 784 int err; 785 786 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 787 * this is the first flow to be dumped into 'skb'. This is unusual for 788 * Netlink but individual action lists can be longer than 789 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 790 * The userspace caller can always fetch the actions separately if it 791 * really wants them. (Most userspace callers in fact don't care.) 792 * 793 * This can only fail for dump operations because the skb is always 794 * properly sized for single flows. 795 */ 796 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS); 797 if (start) { 798 const struct sw_flow_actions *sf_acts; 799 800 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 801 err = ovs_nla_put_actions(sf_acts->actions, 802 sf_acts->actions_len, skb); 803 804 if (!err) 805 nla_nest_end(skb, start); 806 else { 807 if (skb_orig_len) 808 return err; 809 810 nla_nest_cancel(skb, start); 811 } 812 } else if (skb_orig_len) { 813 return -EMSGSIZE; 814 } 815 816 return 0; 817 } 818 819 /* Called with ovs_mutex or RCU read lock. */ 820 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 821 struct sk_buff *skb, u32 portid, 822 u32 seq, u32 flags, u8 cmd, u32 ufid_flags) 823 { 824 const int skb_orig_len = skb->len; 825 struct ovs_header *ovs_header; 826 int err; 827 828 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 829 flags, cmd); 830 if (!ovs_header) 831 return -EMSGSIZE; 832 833 ovs_header->dp_ifindex = dp_ifindex; 834 835 err = ovs_nla_put_identifier(flow, skb); 836 if (err) 837 goto error; 838 839 if (should_fill_key(&flow->id, ufid_flags)) { 840 err = ovs_nla_put_masked_key(flow, skb); 841 if (err) 842 goto error; 843 } 844 845 if (should_fill_mask(ufid_flags)) { 846 err = ovs_nla_put_mask(flow, skb); 847 if (err) 848 goto error; 849 } 850 851 err = ovs_flow_cmd_fill_stats(flow, skb); 852 if (err) 853 goto error; 854 855 if (should_fill_actions(ufid_flags)) { 856 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 857 if (err) 858 goto error; 859 } 860 861 genlmsg_end(skb, ovs_header); 862 return 0; 863 864 error: 865 genlmsg_cancel(skb, ovs_header); 866 return err; 867 } 868 869 /* May not be called with RCU read lock. */ 870 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 871 const struct sw_flow_id *sfid, 872 struct genl_info *info, 873 bool always, 874 uint32_t ufid_flags) 875 { 876 struct sk_buff *skb; 877 size_t len; 878 879 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 880 return NULL; 881 882 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); 883 skb = genlmsg_new_unicast(len, info, GFP_KERNEL); 884 if (!skb) 885 return ERR_PTR(-ENOMEM); 886 887 return skb; 888 } 889 890 /* Called with ovs_mutex. */ 891 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 892 int dp_ifindex, 893 struct genl_info *info, u8 cmd, 894 bool always, u32 ufid_flags) 895 { 896 struct sk_buff *skb; 897 int retval; 898 899 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), 900 &flow->id, info, always, ufid_flags); 901 if (IS_ERR_OR_NULL(skb)) 902 return skb; 903 904 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 905 info->snd_portid, info->snd_seq, 0, 906 cmd, ufid_flags); 907 BUG_ON(retval < 0); 908 return skb; 909 } 910 911 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 912 { 913 struct net *net = sock_net(skb->sk); 914 struct nlattr **a = info->attrs; 915 struct ovs_header *ovs_header = info->userhdr; 916 struct sw_flow *flow = NULL, *new_flow; 917 struct sw_flow_mask mask; 918 struct sk_buff *reply; 919 struct datapath *dp; 920 struct sw_flow_key key; 921 struct sw_flow_actions *acts; 922 struct sw_flow_match match; 923 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 924 int error; 925 bool log = !a[OVS_FLOW_ATTR_PROBE]; 926 927 /* Must have key and actions. */ 928 error = -EINVAL; 929 if (!a[OVS_FLOW_ATTR_KEY]) { 930 OVS_NLERR(log, "Flow key attr not present in new flow."); 931 goto error; 932 } 933 if (!a[OVS_FLOW_ATTR_ACTIONS]) { 934 OVS_NLERR(log, "Flow actions attr not present in new flow."); 935 goto error; 936 } 937 938 /* Most of the time we need to allocate a new flow, do it before 939 * locking. 940 */ 941 new_flow = ovs_flow_alloc(); 942 if (IS_ERR(new_flow)) { 943 error = PTR_ERR(new_flow); 944 goto error; 945 } 946 947 /* Extract key. */ 948 ovs_match_init(&match, &key, &mask); 949 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 950 a[OVS_FLOW_ATTR_MASK], log); 951 if (error) 952 goto err_kfree_flow; 953 954 ovs_flow_mask_key(&new_flow->key, &key, true, &mask); 955 956 /* Extract flow identifier. */ 957 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID], 958 &key, log); 959 if (error) 960 goto err_kfree_flow; 961 962 /* Validate actions. */ 963 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS], 964 &new_flow->key, &acts, log); 965 if (error) { 966 OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); 967 goto err_kfree_flow; 968 } 969 970 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false, 971 ufid_flags); 972 if (IS_ERR(reply)) { 973 error = PTR_ERR(reply); 974 goto err_kfree_acts; 975 } 976 977 ovs_lock(); 978 dp = get_dp(net, ovs_header->dp_ifindex); 979 if (unlikely(!dp)) { 980 error = -ENODEV; 981 goto err_unlock_ovs; 982 } 983 984 /* Check if this is a duplicate flow */ 985 if (ovs_identifier_is_ufid(&new_flow->id)) 986 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id); 987 if (!flow) 988 flow = ovs_flow_tbl_lookup(&dp->table, &key); 989 if (likely(!flow)) { 990 rcu_assign_pointer(new_flow->sf_acts, acts); 991 992 /* Put flow in bucket. */ 993 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 994 if (unlikely(error)) { 995 acts = NULL; 996 goto err_unlock_ovs; 997 } 998 999 if (unlikely(reply)) { 1000 error = ovs_flow_cmd_fill_info(new_flow, 1001 ovs_header->dp_ifindex, 1002 reply, info->snd_portid, 1003 info->snd_seq, 0, 1004 OVS_FLOW_CMD_NEW, 1005 ufid_flags); 1006 BUG_ON(error < 0); 1007 } 1008 ovs_unlock(); 1009 } else { 1010 struct sw_flow_actions *old_acts; 1011 1012 /* Bail out if we're not allowed to modify an existing flow. 1013 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 1014 * because Generic Netlink treats the latter as a dump 1015 * request. We also accept NLM_F_EXCL in case that bug ever 1016 * gets fixed. 1017 */ 1018 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 1019 | NLM_F_EXCL))) { 1020 error = -EEXIST; 1021 goto err_unlock_ovs; 1022 } 1023 /* The flow identifier has to be the same for flow updates. 1024 * Look for any overlapping flow. 1025 */ 1026 if (unlikely(!ovs_flow_cmp(flow, &match))) { 1027 if (ovs_identifier_is_key(&flow->id)) 1028 flow = ovs_flow_tbl_lookup_exact(&dp->table, 1029 &match); 1030 else /* UFID matches but key is different */ 1031 flow = NULL; 1032 if (!flow) { 1033 error = -ENOENT; 1034 goto err_unlock_ovs; 1035 } 1036 } 1037 /* Update actions. */ 1038 old_acts = ovsl_dereference(flow->sf_acts); 1039 rcu_assign_pointer(flow->sf_acts, acts); 1040 1041 if (unlikely(reply)) { 1042 error = ovs_flow_cmd_fill_info(flow, 1043 ovs_header->dp_ifindex, 1044 reply, info->snd_portid, 1045 info->snd_seq, 0, 1046 OVS_FLOW_CMD_NEW, 1047 ufid_flags); 1048 BUG_ON(error < 0); 1049 } 1050 ovs_unlock(); 1051 1052 ovs_nla_free_flow_actions_rcu(old_acts); 1053 ovs_flow_free(new_flow, false); 1054 } 1055 1056 if (reply) 1057 ovs_notify(&dp_flow_genl_family, reply, info); 1058 return 0; 1059 1060 err_unlock_ovs: 1061 ovs_unlock(); 1062 kfree_skb(reply); 1063 err_kfree_acts: 1064 ovs_nla_free_flow_actions(acts); 1065 err_kfree_flow: 1066 ovs_flow_free(new_flow, false); 1067 error: 1068 return error; 1069 } 1070 1071 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ 1072 static struct sw_flow_actions *get_flow_actions(struct net *net, 1073 const struct nlattr *a, 1074 const struct sw_flow_key *key, 1075 const struct sw_flow_mask *mask, 1076 bool log) 1077 { 1078 struct sw_flow_actions *acts; 1079 struct sw_flow_key masked_key; 1080 int error; 1081 1082 ovs_flow_mask_key(&masked_key, key, true, mask); 1083 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log); 1084 if (error) { 1085 OVS_NLERR(log, 1086 "Actions may not be safe on all matching packets"); 1087 return ERR_PTR(error); 1088 } 1089 1090 return acts; 1091 } 1092 1093 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 1094 { 1095 struct net *net = sock_net(skb->sk); 1096 struct nlattr **a = info->attrs; 1097 struct ovs_header *ovs_header = info->userhdr; 1098 struct sw_flow_key key; 1099 struct sw_flow *flow; 1100 struct sw_flow_mask mask; 1101 struct sk_buff *reply = NULL; 1102 struct datapath *dp; 1103 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 1104 struct sw_flow_match match; 1105 struct sw_flow_id sfid; 1106 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1107 int error; 1108 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1109 bool ufid_present; 1110 1111 /* Extract key. */ 1112 error = -EINVAL; 1113 if (!a[OVS_FLOW_ATTR_KEY]) { 1114 OVS_NLERR(log, "Flow key attribute not present in set flow."); 1115 goto error; 1116 } 1117 1118 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); 1119 ovs_match_init(&match, &key, &mask); 1120 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1121 a[OVS_FLOW_ATTR_MASK], log); 1122 if (error) 1123 goto error; 1124 1125 /* Validate actions. */ 1126 if (a[OVS_FLOW_ATTR_ACTIONS]) { 1127 acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key, 1128 &mask, log); 1129 if (IS_ERR(acts)) { 1130 error = PTR_ERR(acts); 1131 goto error; 1132 } 1133 1134 /* Can allocate before locking if have acts. */ 1135 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false, 1136 ufid_flags); 1137 if (IS_ERR(reply)) { 1138 error = PTR_ERR(reply); 1139 goto err_kfree_acts; 1140 } 1141 } 1142 1143 ovs_lock(); 1144 dp = get_dp(net, ovs_header->dp_ifindex); 1145 if (unlikely(!dp)) { 1146 error = -ENODEV; 1147 goto err_unlock_ovs; 1148 } 1149 /* Check that the flow exists. */ 1150 if (ufid_present) 1151 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid); 1152 else 1153 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1154 if (unlikely(!flow)) { 1155 error = -ENOENT; 1156 goto err_unlock_ovs; 1157 } 1158 1159 /* Update actions, if present. */ 1160 if (likely(acts)) { 1161 old_acts = ovsl_dereference(flow->sf_acts); 1162 rcu_assign_pointer(flow->sf_acts, acts); 1163 1164 if (unlikely(reply)) { 1165 error = ovs_flow_cmd_fill_info(flow, 1166 ovs_header->dp_ifindex, 1167 reply, info->snd_portid, 1168 info->snd_seq, 0, 1169 OVS_FLOW_CMD_NEW, 1170 ufid_flags); 1171 BUG_ON(error < 0); 1172 } 1173 } else { 1174 /* Could not alloc without acts before locking. */ 1175 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1176 info, OVS_FLOW_CMD_NEW, false, 1177 ufid_flags); 1178 1179 if (unlikely(IS_ERR(reply))) { 1180 error = PTR_ERR(reply); 1181 goto err_unlock_ovs; 1182 } 1183 } 1184 1185 /* Clear stats. */ 1186 if (a[OVS_FLOW_ATTR_CLEAR]) 1187 ovs_flow_stats_clear(flow); 1188 ovs_unlock(); 1189 1190 if (reply) 1191 ovs_notify(&dp_flow_genl_family, reply, info); 1192 if (old_acts) 1193 ovs_nla_free_flow_actions_rcu(old_acts); 1194 1195 return 0; 1196 1197 err_unlock_ovs: 1198 ovs_unlock(); 1199 kfree_skb(reply); 1200 err_kfree_acts: 1201 ovs_nla_free_flow_actions(acts); 1202 error: 1203 return error; 1204 } 1205 1206 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1207 { 1208 struct nlattr **a = info->attrs; 1209 struct ovs_header *ovs_header = info->userhdr; 1210 struct net *net = sock_net(skb->sk); 1211 struct sw_flow_key key; 1212 struct sk_buff *reply; 1213 struct sw_flow *flow; 1214 struct datapath *dp; 1215 struct sw_flow_match match; 1216 struct sw_flow_id ufid; 1217 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1218 int err = 0; 1219 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1220 bool ufid_present; 1221 1222 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1223 if (a[OVS_FLOW_ATTR_KEY]) { 1224 ovs_match_init(&match, &key, NULL); 1225 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL, 1226 log); 1227 } else if (!ufid_present) { 1228 OVS_NLERR(log, 1229 "Flow get message rejected, Key attribute missing."); 1230 err = -EINVAL; 1231 } 1232 if (err) 1233 return err; 1234 1235 ovs_lock(); 1236 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1237 if (!dp) { 1238 err = -ENODEV; 1239 goto unlock; 1240 } 1241 1242 if (ufid_present) 1243 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1244 else 1245 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1246 if (!flow) { 1247 err = -ENOENT; 1248 goto unlock; 1249 } 1250 1251 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1252 OVS_FLOW_CMD_NEW, true, ufid_flags); 1253 if (IS_ERR(reply)) { 1254 err = PTR_ERR(reply); 1255 goto unlock; 1256 } 1257 1258 ovs_unlock(); 1259 return genlmsg_reply(reply, info); 1260 unlock: 1261 ovs_unlock(); 1262 return err; 1263 } 1264 1265 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1266 { 1267 struct nlattr **a = info->attrs; 1268 struct ovs_header *ovs_header = info->userhdr; 1269 struct net *net = sock_net(skb->sk); 1270 struct sw_flow_key key; 1271 struct sk_buff *reply; 1272 struct sw_flow *flow = NULL; 1273 struct datapath *dp; 1274 struct sw_flow_match match; 1275 struct sw_flow_id ufid; 1276 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1277 int err; 1278 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1279 bool ufid_present; 1280 1281 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1282 if (a[OVS_FLOW_ATTR_KEY]) { 1283 ovs_match_init(&match, &key, NULL); 1284 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1285 NULL, log); 1286 if (unlikely(err)) 1287 return err; 1288 } 1289 1290 ovs_lock(); 1291 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1292 if (unlikely(!dp)) { 1293 err = -ENODEV; 1294 goto unlock; 1295 } 1296 1297 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) { 1298 err = ovs_flow_tbl_flush(&dp->table); 1299 goto unlock; 1300 } 1301 1302 if (ufid_present) 1303 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1304 else 1305 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1306 if (unlikely(!flow)) { 1307 err = -ENOENT; 1308 goto unlock; 1309 } 1310 1311 ovs_flow_tbl_remove(&dp->table, flow); 1312 ovs_unlock(); 1313 1314 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1315 &flow->id, info, false, ufid_flags); 1316 if (likely(reply)) { 1317 if (likely(!IS_ERR(reply))) { 1318 rcu_read_lock(); /*To keep RCU checker happy. */ 1319 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1320 reply, info->snd_portid, 1321 info->snd_seq, 0, 1322 OVS_FLOW_CMD_DEL, 1323 ufid_flags); 1324 rcu_read_unlock(); 1325 BUG_ON(err < 0); 1326 1327 ovs_notify(&dp_flow_genl_family, reply, info); 1328 } else { 1329 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply)); 1330 } 1331 } 1332 1333 ovs_flow_free(flow, true); 1334 return 0; 1335 unlock: 1336 ovs_unlock(); 1337 return err; 1338 } 1339 1340 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1341 { 1342 struct nlattr *a[__OVS_FLOW_ATTR_MAX]; 1343 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1344 struct table_instance *ti; 1345 struct datapath *dp; 1346 u32 ufid_flags; 1347 int err; 1348 1349 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a, 1350 OVS_FLOW_ATTR_MAX, flow_policy); 1351 if (err) 1352 return err; 1353 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1354 1355 rcu_read_lock(); 1356 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1357 if (!dp) { 1358 rcu_read_unlock(); 1359 return -ENODEV; 1360 } 1361 1362 ti = rcu_dereference(dp->table.ti); 1363 for (;;) { 1364 struct sw_flow *flow; 1365 u32 bucket, obj; 1366 1367 bucket = cb->args[0]; 1368 obj = cb->args[1]; 1369 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1370 if (!flow) 1371 break; 1372 1373 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1374 NETLINK_CB(cb->skb).portid, 1375 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1376 OVS_FLOW_CMD_NEW, ufid_flags) < 0) 1377 break; 1378 1379 cb->args[0] = bucket; 1380 cb->args[1] = obj; 1381 } 1382 rcu_read_unlock(); 1383 return skb->len; 1384 } 1385 1386 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1387 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1388 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1389 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1390 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1391 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1392 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, 1393 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, 1394 }; 1395 1396 static const struct genl_ops dp_flow_genl_ops[] = { 1397 { .cmd = OVS_FLOW_CMD_NEW, 1398 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1399 .policy = flow_policy, 1400 .doit = ovs_flow_cmd_new 1401 }, 1402 { .cmd = OVS_FLOW_CMD_DEL, 1403 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1404 .policy = flow_policy, 1405 .doit = ovs_flow_cmd_del 1406 }, 1407 { .cmd = OVS_FLOW_CMD_GET, 1408 .flags = 0, /* OK for unprivileged users. */ 1409 .policy = flow_policy, 1410 .doit = ovs_flow_cmd_get, 1411 .dumpit = ovs_flow_cmd_dump 1412 }, 1413 { .cmd = OVS_FLOW_CMD_SET, 1414 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1415 .policy = flow_policy, 1416 .doit = ovs_flow_cmd_set, 1417 }, 1418 }; 1419 1420 static struct genl_family dp_flow_genl_family = { 1421 .id = GENL_ID_GENERATE, 1422 .hdrsize = sizeof(struct ovs_header), 1423 .name = OVS_FLOW_FAMILY, 1424 .version = OVS_FLOW_VERSION, 1425 .maxattr = OVS_FLOW_ATTR_MAX, 1426 .netnsok = true, 1427 .parallel_ops = true, 1428 .ops = dp_flow_genl_ops, 1429 .n_ops = ARRAY_SIZE(dp_flow_genl_ops), 1430 .mcgrps = &ovs_dp_flow_multicast_group, 1431 .n_mcgrps = 1, 1432 }; 1433 1434 static size_t ovs_dp_cmd_msg_size(void) 1435 { 1436 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1437 1438 msgsize += nla_total_size(IFNAMSIZ); 1439 msgsize += nla_total_size(sizeof(struct ovs_dp_stats)); 1440 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats)); 1441 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1442 1443 return msgsize; 1444 } 1445 1446 /* Called with ovs_mutex. */ 1447 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1448 u32 portid, u32 seq, u32 flags, u8 cmd) 1449 { 1450 struct ovs_header *ovs_header; 1451 struct ovs_dp_stats dp_stats; 1452 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1453 int err; 1454 1455 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1456 flags, cmd); 1457 if (!ovs_header) 1458 goto error; 1459 1460 ovs_header->dp_ifindex = get_dpifindex(dp); 1461 1462 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1463 if (err) 1464 goto nla_put_failure; 1465 1466 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1467 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1468 &dp_stats)) 1469 goto nla_put_failure; 1470 1471 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1472 sizeof(struct ovs_dp_megaflow_stats), 1473 &dp_megaflow_stats)) 1474 goto nla_put_failure; 1475 1476 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1477 goto nla_put_failure; 1478 1479 genlmsg_end(skb, ovs_header); 1480 return 0; 1481 1482 nla_put_failure: 1483 genlmsg_cancel(skb, ovs_header); 1484 error: 1485 return -EMSGSIZE; 1486 } 1487 1488 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info) 1489 { 1490 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL); 1491 } 1492 1493 /* Called with rcu_read_lock or ovs_mutex. */ 1494 static struct datapath *lookup_datapath(struct net *net, 1495 const struct ovs_header *ovs_header, 1496 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1497 { 1498 struct datapath *dp; 1499 1500 if (!a[OVS_DP_ATTR_NAME]) 1501 dp = get_dp(net, ovs_header->dp_ifindex); 1502 else { 1503 struct vport *vport; 1504 1505 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1506 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1507 } 1508 return dp ? dp : ERR_PTR(-ENODEV); 1509 } 1510 1511 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info) 1512 { 1513 struct datapath *dp; 1514 1515 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1516 if (IS_ERR(dp)) 1517 return; 1518 1519 WARN(dp->user_features, "Dropping previously announced user features\n"); 1520 dp->user_features = 0; 1521 } 1522 1523 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1524 { 1525 if (a[OVS_DP_ATTR_USER_FEATURES]) 1526 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1527 } 1528 1529 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1530 { 1531 struct nlattr **a = info->attrs; 1532 struct vport_parms parms; 1533 struct sk_buff *reply; 1534 struct datapath *dp; 1535 struct vport *vport; 1536 struct ovs_net *ovs_net; 1537 int err, i; 1538 1539 err = -EINVAL; 1540 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1541 goto err; 1542 1543 reply = ovs_dp_cmd_alloc_info(info); 1544 if (!reply) 1545 return -ENOMEM; 1546 1547 err = -ENOMEM; 1548 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1549 if (dp == NULL) 1550 goto err_free_reply; 1551 1552 ovs_dp_set_net(dp, sock_net(skb->sk)); 1553 1554 /* Allocate table. */ 1555 err = ovs_flow_tbl_init(&dp->table); 1556 if (err) 1557 goto err_free_dp; 1558 1559 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1560 if (!dp->stats_percpu) { 1561 err = -ENOMEM; 1562 goto err_destroy_table; 1563 } 1564 1565 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head), 1566 GFP_KERNEL); 1567 if (!dp->ports) { 1568 err = -ENOMEM; 1569 goto err_destroy_percpu; 1570 } 1571 1572 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1573 INIT_HLIST_HEAD(&dp->ports[i]); 1574 1575 /* Set up our datapath device. */ 1576 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1577 parms.type = OVS_VPORT_TYPE_INTERNAL; 1578 parms.options = NULL; 1579 parms.dp = dp; 1580 parms.port_no = OVSP_LOCAL; 1581 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1582 1583 ovs_dp_change(dp, a); 1584 1585 /* So far only local changes have been made, now need the lock. */ 1586 ovs_lock(); 1587 1588 vport = new_vport(&parms); 1589 if (IS_ERR(vport)) { 1590 err = PTR_ERR(vport); 1591 if (err == -EBUSY) 1592 err = -EEXIST; 1593 1594 if (err == -EEXIST) { 1595 /* An outdated user space instance that does not understand 1596 * the concept of user_features has attempted to create a new 1597 * datapath and is likely to reuse it. Drop all user features. 1598 */ 1599 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1600 ovs_dp_reset_user_features(skb, info); 1601 } 1602 1603 goto err_destroy_ports_array; 1604 } 1605 1606 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1607 info->snd_seq, 0, OVS_DP_CMD_NEW); 1608 BUG_ON(err < 0); 1609 1610 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1611 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1612 1613 ovs_unlock(); 1614 1615 ovs_notify(&dp_datapath_genl_family, reply, info); 1616 return 0; 1617 1618 err_destroy_ports_array: 1619 ovs_unlock(); 1620 kfree(dp->ports); 1621 err_destroy_percpu: 1622 free_percpu(dp->stats_percpu); 1623 err_destroy_table: 1624 ovs_flow_tbl_destroy(&dp->table); 1625 err_free_dp: 1626 kfree(dp); 1627 err_free_reply: 1628 kfree_skb(reply); 1629 err: 1630 return err; 1631 } 1632 1633 /* Called with ovs_mutex. */ 1634 static void __dp_destroy(struct datapath *dp) 1635 { 1636 int i; 1637 1638 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1639 struct vport *vport; 1640 struct hlist_node *n; 1641 1642 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1643 if (vport->port_no != OVSP_LOCAL) 1644 ovs_dp_detach_port(vport); 1645 } 1646 1647 list_del_rcu(&dp->list_node); 1648 1649 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1650 * all ports in datapath are destroyed first before freeing datapath. 1651 */ 1652 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1653 1654 /* RCU destroy the flow table */ 1655 call_rcu(&dp->rcu, destroy_dp_rcu); 1656 } 1657 1658 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1659 { 1660 struct sk_buff *reply; 1661 struct datapath *dp; 1662 int err; 1663 1664 reply = ovs_dp_cmd_alloc_info(info); 1665 if (!reply) 1666 return -ENOMEM; 1667 1668 ovs_lock(); 1669 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1670 err = PTR_ERR(dp); 1671 if (IS_ERR(dp)) 1672 goto err_unlock_free; 1673 1674 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1675 info->snd_seq, 0, OVS_DP_CMD_DEL); 1676 BUG_ON(err < 0); 1677 1678 __dp_destroy(dp); 1679 ovs_unlock(); 1680 1681 ovs_notify(&dp_datapath_genl_family, reply, info); 1682 1683 return 0; 1684 1685 err_unlock_free: 1686 ovs_unlock(); 1687 kfree_skb(reply); 1688 return err; 1689 } 1690 1691 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1692 { 1693 struct sk_buff *reply; 1694 struct datapath *dp; 1695 int err; 1696 1697 reply = ovs_dp_cmd_alloc_info(info); 1698 if (!reply) 1699 return -ENOMEM; 1700 1701 ovs_lock(); 1702 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1703 err = PTR_ERR(dp); 1704 if (IS_ERR(dp)) 1705 goto err_unlock_free; 1706 1707 ovs_dp_change(dp, info->attrs); 1708 1709 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1710 info->snd_seq, 0, OVS_DP_CMD_NEW); 1711 BUG_ON(err < 0); 1712 1713 ovs_unlock(); 1714 ovs_notify(&dp_datapath_genl_family, reply, info); 1715 1716 return 0; 1717 1718 err_unlock_free: 1719 ovs_unlock(); 1720 kfree_skb(reply); 1721 return err; 1722 } 1723 1724 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1725 { 1726 struct sk_buff *reply; 1727 struct datapath *dp; 1728 int err; 1729 1730 reply = ovs_dp_cmd_alloc_info(info); 1731 if (!reply) 1732 return -ENOMEM; 1733 1734 ovs_lock(); 1735 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1736 if (IS_ERR(dp)) { 1737 err = PTR_ERR(dp); 1738 goto err_unlock_free; 1739 } 1740 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1741 info->snd_seq, 0, OVS_DP_CMD_NEW); 1742 BUG_ON(err < 0); 1743 ovs_unlock(); 1744 1745 return genlmsg_reply(reply, info); 1746 1747 err_unlock_free: 1748 ovs_unlock(); 1749 kfree_skb(reply); 1750 return err; 1751 } 1752 1753 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1754 { 1755 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1756 struct datapath *dp; 1757 int skip = cb->args[0]; 1758 int i = 0; 1759 1760 ovs_lock(); 1761 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1762 if (i >= skip && 1763 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1764 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1765 OVS_DP_CMD_NEW) < 0) 1766 break; 1767 i++; 1768 } 1769 ovs_unlock(); 1770 1771 cb->args[0] = i; 1772 1773 return skb->len; 1774 } 1775 1776 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1777 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1778 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1779 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1780 }; 1781 1782 static const struct genl_ops dp_datapath_genl_ops[] = { 1783 { .cmd = OVS_DP_CMD_NEW, 1784 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1785 .policy = datapath_policy, 1786 .doit = ovs_dp_cmd_new 1787 }, 1788 { .cmd = OVS_DP_CMD_DEL, 1789 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1790 .policy = datapath_policy, 1791 .doit = ovs_dp_cmd_del 1792 }, 1793 { .cmd = OVS_DP_CMD_GET, 1794 .flags = 0, /* OK for unprivileged users. */ 1795 .policy = datapath_policy, 1796 .doit = ovs_dp_cmd_get, 1797 .dumpit = ovs_dp_cmd_dump 1798 }, 1799 { .cmd = OVS_DP_CMD_SET, 1800 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1801 .policy = datapath_policy, 1802 .doit = ovs_dp_cmd_set, 1803 }, 1804 }; 1805 1806 static struct genl_family dp_datapath_genl_family = { 1807 .id = GENL_ID_GENERATE, 1808 .hdrsize = sizeof(struct ovs_header), 1809 .name = OVS_DATAPATH_FAMILY, 1810 .version = OVS_DATAPATH_VERSION, 1811 .maxattr = OVS_DP_ATTR_MAX, 1812 .netnsok = true, 1813 .parallel_ops = true, 1814 .ops = dp_datapath_genl_ops, 1815 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops), 1816 .mcgrps = &ovs_dp_datapath_multicast_group, 1817 .n_mcgrps = 1, 1818 }; 1819 1820 /* Called with ovs_mutex or RCU read lock. */ 1821 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1822 u32 portid, u32 seq, u32 flags, u8 cmd) 1823 { 1824 struct ovs_header *ovs_header; 1825 struct ovs_vport_stats vport_stats; 1826 int err; 1827 1828 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1829 flags, cmd); 1830 if (!ovs_header) 1831 return -EMSGSIZE; 1832 1833 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1834 1835 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1836 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1837 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 1838 ovs_vport_name(vport))) 1839 goto nla_put_failure; 1840 1841 ovs_vport_get_stats(vport, &vport_stats); 1842 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), 1843 &vport_stats)) 1844 goto nla_put_failure; 1845 1846 if (ovs_vport_get_upcall_portids(vport, skb)) 1847 goto nla_put_failure; 1848 1849 err = ovs_vport_get_options(vport, skb); 1850 if (err == -EMSGSIZE) 1851 goto error; 1852 1853 genlmsg_end(skb, ovs_header); 1854 return 0; 1855 1856 nla_put_failure: 1857 err = -EMSGSIZE; 1858 error: 1859 genlmsg_cancel(skb, ovs_header); 1860 return err; 1861 } 1862 1863 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 1864 { 1865 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1866 } 1867 1868 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 1869 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid, 1870 u32 seq, u8 cmd) 1871 { 1872 struct sk_buff *skb; 1873 int retval; 1874 1875 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1876 if (!skb) 1877 return ERR_PTR(-ENOMEM); 1878 1879 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd); 1880 BUG_ON(retval < 0); 1881 1882 return skb; 1883 } 1884 1885 /* Called with ovs_mutex or RCU read lock. */ 1886 static struct vport *lookup_vport(struct net *net, 1887 const struct ovs_header *ovs_header, 1888 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1889 { 1890 struct datapath *dp; 1891 struct vport *vport; 1892 1893 if (a[OVS_VPORT_ATTR_NAME]) { 1894 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 1895 if (!vport) 1896 return ERR_PTR(-ENODEV); 1897 if (ovs_header->dp_ifindex && 1898 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 1899 return ERR_PTR(-ENODEV); 1900 return vport; 1901 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 1902 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1903 1904 if (port_no >= DP_MAX_PORTS) 1905 return ERR_PTR(-EFBIG); 1906 1907 dp = get_dp(net, ovs_header->dp_ifindex); 1908 if (!dp) 1909 return ERR_PTR(-ENODEV); 1910 1911 vport = ovs_vport_ovsl_rcu(dp, port_no); 1912 if (!vport) 1913 return ERR_PTR(-ENODEV); 1914 return vport; 1915 } else 1916 return ERR_PTR(-EINVAL); 1917 } 1918 1919 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 1920 { 1921 struct nlattr **a = info->attrs; 1922 struct ovs_header *ovs_header = info->userhdr; 1923 struct vport_parms parms; 1924 struct sk_buff *reply; 1925 struct vport *vport; 1926 struct datapath *dp; 1927 u32 port_no; 1928 int err; 1929 1930 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 1931 !a[OVS_VPORT_ATTR_UPCALL_PID]) 1932 return -EINVAL; 1933 1934 port_no = a[OVS_VPORT_ATTR_PORT_NO] 1935 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 1936 if (port_no >= DP_MAX_PORTS) 1937 return -EFBIG; 1938 1939 reply = ovs_vport_cmd_alloc_info(); 1940 if (!reply) 1941 return -ENOMEM; 1942 1943 ovs_lock(); 1944 restart: 1945 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1946 err = -ENODEV; 1947 if (!dp) 1948 goto exit_unlock_free; 1949 1950 if (port_no) { 1951 vport = ovs_vport_ovsl(dp, port_no); 1952 err = -EBUSY; 1953 if (vport) 1954 goto exit_unlock_free; 1955 } else { 1956 for (port_no = 1; ; port_no++) { 1957 if (port_no >= DP_MAX_PORTS) { 1958 err = -EFBIG; 1959 goto exit_unlock_free; 1960 } 1961 vport = ovs_vport_ovsl(dp, port_no); 1962 if (!vport) 1963 break; 1964 } 1965 } 1966 1967 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 1968 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 1969 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 1970 parms.dp = dp; 1971 parms.port_no = port_no; 1972 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 1973 1974 vport = new_vport(&parms); 1975 err = PTR_ERR(vport); 1976 if (IS_ERR(vport)) { 1977 if (err == -EAGAIN) 1978 goto restart; 1979 goto exit_unlock_free; 1980 } 1981 1982 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 1983 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 1984 BUG_ON(err < 0); 1985 ovs_unlock(); 1986 1987 ovs_notify(&dp_vport_genl_family, reply, info); 1988 return 0; 1989 1990 exit_unlock_free: 1991 ovs_unlock(); 1992 kfree_skb(reply); 1993 return err; 1994 } 1995 1996 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 1997 { 1998 struct nlattr **a = info->attrs; 1999 struct sk_buff *reply; 2000 struct vport *vport; 2001 int err; 2002 2003 reply = ovs_vport_cmd_alloc_info(); 2004 if (!reply) 2005 return -ENOMEM; 2006 2007 ovs_lock(); 2008 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2009 err = PTR_ERR(vport); 2010 if (IS_ERR(vport)) 2011 goto exit_unlock_free; 2012 2013 if (a[OVS_VPORT_ATTR_TYPE] && 2014 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 2015 err = -EINVAL; 2016 goto exit_unlock_free; 2017 } 2018 2019 if (a[OVS_VPORT_ATTR_OPTIONS]) { 2020 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 2021 if (err) 2022 goto exit_unlock_free; 2023 } 2024 2025 2026 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 2027 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2028 2029 err = ovs_vport_set_upcall_portids(vport, ids); 2030 if (err) 2031 goto exit_unlock_free; 2032 } 2033 2034 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 2035 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 2036 BUG_ON(err < 0); 2037 2038 ovs_unlock(); 2039 ovs_notify(&dp_vport_genl_family, reply, info); 2040 return 0; 2041 2042 exit_unlock_free: 2043 ovs_unlock(); 2044 kfree_skb(reply); 2045 return err; 2046 } 2047 2048 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2049 { 2050 struct nlattr **a = info->attrs; 2051 struct sk_buff *reply; 2052 struct vport *vport; 2053 int err; 2054 2055 reply = ovs_vport_cmd_alloc_info(); 2056 if (!reply) 2057 return -ENOMEM; 2058 2059 ovs_lock(); 2060 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2061 err = PTR_ERR(vport); 2062 if (IS_ERR(vport)) 2063 goto exit_unlock_free; 2064 2065 if (vport->port_no == OVSP_LOCAL) { 2066 err = -EINVAL; 2067 goto exit_unlock_free; 2068 } 2069 2070 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 2071 info->snd_seq, 0, OVS_VPORT_CMD_DEL); 2072 BUG_ON(err < 0); 2073 ovs_dp_detach_port(vport); 2074 ovs_unlock(); 2075 2076 ovs_notify(&dp_vport_genl_family, reply, info); 2077 return 0; 2078 2079 exit_unlock_free: 2080 ovs_unlock(); 2081 kfree_skb(reply); 2082 return err; 2083 } 2084 2085 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2086 { 2087 struct nlattr **a = info->attrs; 2088 struct ovs_header *ovs_header = info->userhdr; 2089 struct sk_buff *reply; 2090 struct vport *vport; 2091 int err; 2092 2093 reply = ovs_vport_cmd_alloc_info(); 2094 if (!reply) 2095 return -ENOMEM; 2096 2097 rcu_read_lock(); 2098 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2099 err = PTR_ERR(vport); 2100 if (IS_ERR(vport)) 2101 goto exit_unlock_free; 2102 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 2103 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 2104 BUG_ON(err < 0); 2105 rcu_read_unlock(); 2106 2107 return genlmsg_reply(reply, info); 2108 2109 exit_unlock_free: 2110 rcu_read_unlock(); 2111 kfree_skb(reply); 2112 return err; 2113 } 2114 2115 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2116 { 2117 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2118 struct datapath *dp; 2119 int bucket = cb->args[0], skip = cb->args[1]; 2120 int i, j = 0; 2121 2122 rcu_read_lock(); 2123 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2124 if (!dp) { 2125 rcu_read_unlock(); 2126 return -ENODEV; 2127 } 2128 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2129 struct vport *vport; 2130 2131 j = 0; 2132 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2133 if (j >= skip && 2134 ovs_vport_cmd_fill_info(vport, skb, 2135 NETLINK_CB(cb->skb).portid, 2136 cb->nlh->nlmsg_seq, 2137 NLM_F_MULTI, 2138 OVS_VPORT_CMD_NEW) < 0) 2139 goto out; 2140 2141 j++; 2142 } 2143 skip = 0; 2144 } 2145 out: 2146 rcu_read_unlock(); 2147 2148 cb->args[0] = i; 2149 cb->args[1] = j; 2150 2151 return skb->len; 2152 } 2153 2154 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2155 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2156 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2157 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2158 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2159 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 2160 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2161 }; 2162 2163 static const struct genl_ops dp_vport_genl_ops[] = { 2164 { .cmd = OVS_VPORT_CMD_NEW, 2165 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2166 .policy = vport_policy, 2167 .doit = ovs_vport_cmd_new 2168 }, 2169 { .cmd = OVS_VPORT_CMD_DEL, 2170 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2171 .policy = vport_policy, 2172 .doit = ovs_vport_cmd_del 2173 }, 2174 { .cmd = OVS_VPORT_CMD_GET, 2175 .flags = 0, /* OK for unprivileged users. */ 2176 .policy = vport_policy, 2177 .doit = ovs_vport_cmd_get, 2178 .dumpit = ovs_vport_cmd_dump 2179 }, 2180 { .cmd = OVS_VPORT_CMD_SET, 2181 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2182 .policy = vport_policy, 2183 .doit = ovs_vport_cmd_set, 2184 }, 2185 }; 2186 2187 struct genl_family dp_vport_genl_family = { 2188 .id = GENL_ID_GENERATE, 2189 .hdrsize = sizeof(struct ovs_header), 2190 .name = OVS_VPORT_FAMILY, 2191 .version = OVS_VPORT_VERSION, 2192 .maxattr = OVS_VPORT_ATTR_MAX, 2193 .netnsok = true, 2194 .parallel_ops = true, 2195 .ops = dp_vport_genl_ops, 2196 .n_ops = ARRAY_SIZE(dp_vport_genl_ops), 2197 .mcgrps = &ovs_dp_vport_multicast_group, 2198 .n_mcgrps = 1, 2199 }; 2200 2201 static struct genl_family * const dp_genl_families[] = { 2202 &dp_datapath_genl_family, 2203 &dp_vport_genl_family, 2204 &dp_flow_genl_family, 2205 &dp_packet_genl_family, 2206 }; 2207 2208 static void dp_unregister_genl(int n_families) 2209 { 2210 int i; 2211 2212 for (i = 0; i < n_families; i++) 2213 genl_unregister_family(dp_genl_families[i]); 2214 } 2215 2216 static int dp_register_genl(void) 2217 { 2218 int err; 2219 int i; 2220 2221 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2222 2223 err = genl_register_family(dp_genl_families[i]); 2224 if (err) 2225 goto error; 2226 } 2227 2228 return 0; 2229 2230 error: 2231 dp_unregister_genl(i); 2232 return err; 2233 } 2234 2235 static int __net_init ovs_init_net(struct net *net) 2236 { 2237 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2238 2239 INIT_LIST_HEAD(&ovs_net->dps); 2240 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2241 ovs_ct_init(net); 2242 return 0; 2243 } 2244 2245 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2246 struct list_head *head) 2247 { 2248 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2249 struct datapath *dp; 2250 2251 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2252 int i; 2253 2254 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2255 struct vport *vport; 2256 2257 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2258 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2259 continue; 2260 2261 if (dev_net(vport->dev) == dnet) 2262 list_add(&vport->detach_list, head); 2263 } 2264 } 2265 } 2266 } 2267 2268 static void __net_exit ovs_exit_net(struct net *dnet) 2269 { 2270 struct datapath *dp, *dp_next; 2271 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2272 struct vport *vport, *vport_next; 2273 struct net *net; 2274 LIST_HEAD(head); 2275 2276 ovs_ct_exit(dnet); 2277 ovs_lock(); 2278 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2279 __dp_destroy(dp); 2280 2281 rtnl_lock(); 2282 for_each_net(net) 2283 list_vports_from_net(net, dnet, &head); 2284 rtnl_unlock(); 2285 2286 /* Detach all vports from given namespace. */ 2287 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2288 list_del(&vport->detach_list); 2289 ovs_dp_detach_port(vport); 2290 } 2291 2292 ovs_unlock(); 2293 2294 cancel_work_sync(&ovs_net->dp_notify_work); 2295 } 2296 2297 static struct pernet_operations ovs_net_ops = { 2298 .init = ovs_init_net, 2299 .exit = ovs_exit_net, 2300 .id = &ovs_net_id, 2301 .size = sizeof(struct ovs_net), 2302 }; 2303 2304 static int __init dp_init(void) 2305 { 2306 int err; 2307 2308 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); 2309 2310 pr_info("Open vSwitch switching datapath\n"); 2311 2312 err = action_fifos_init(); 2313 if (err) 2314 goto error; 2315 2316 err = ovs_internal_dev_rtnl_link_register(); 2317 if (err) 2318 goto error_action_fifos_exit; 2319 2320 err = ovs_flow_init(); 2321 if (err) 2322 goto error_unreg_rtnl_link; 2323 2324 err = ovs_vport_init(); 2325 if (err) 2326 goto error_flow_exit; 2327 2328 err = register_pernet_device(&ovs_net_ops); 2329 if (err) 2330 goto error_vport_exit; 2331 2332 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2333 if (err) 2334 goto error_netns_exit; 2335 2336 err = ovs_netdev_init(); 2337 if (err) 2338 goto error_unreg_notifier; 2339 2340 err = dp_register_genl(); 2341 if (err < 0) 2342 goto error_unreg_netdev; 2343 2344 return 0; 2345 2346 error_unreg_netdev: 2347 ovs_netdev_exit(); 2348 error_unreg_notifier: 2349 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2350 error_netns_exit: 2351 unregister_pernet_device(&ovs_net_ops); 2352 error_vport_exit: 2353 ovs_vport_exit(); 2354 error_flow_exit: 2355 ovs_flow_exit(); 2356 error_unreg_rtnl_link: 2357 ovs_internal_dev_rtnl_link_unregister(); 2358 error_action_fifos_exit: 2359 action_fifos_exit(); 2360 error: 2361 return err; 2362 } 2363 2364 static void dp_cleanup(void) 2365 { 2366 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2367 ovs_netdev_exit(); 2368 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2369 unregister_pernet_device(&ovs_net_ops); 2370 rcu_barrier(); 2371 ovs_vport_exit(); 2372 ovs_flow_exit(); 2373 ovs_internal_dev_rtnl_link_unregister(); 2374 action_fifos_exit(); 2375 } 2376 2377 module_init(dp_init); 2378 module_exit(dp_cleanup); 2379 2380 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2381 MODULE_LICENSE("GPL"); 2382