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_egress_tunnel_key(user_skb, 494 upcall_info->egress_tun_info, 495 upcall_info->egress_tun_opts); 496 BUG_ON(err); 497 nla_nest_end(user_skb, nla); 498 } 499 500 if (upcall_info->actions_len) { 501 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS); 502 err = ovs_nla_put_actions(upcall_info->actions, 503 upcall_info->actions_len, 504 user_skb); 505 if (!err) 506 nla_nest_end(user_skb, nla); 507 else 508 nla_nest_cancel(user_skb, nla); 509 } 510 511 /* Add OVS_PACKET_ATTR_MRU */ 512 if (upcall_info->mru) { 513 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, 514 upcall_info->mru)) { 515 err = -ENOBUFS; 516 goto out; 517 } 518 pad_packet(dp, user_skb); 519 } 520 521 /* Only reserve room for attribute header, packet data is added 522 * in skb_zerocopy() */ 523 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 524 err = -ENOBUFS; 525 goto out; 526 } 527 nla->nla_len = nla_attr_size(skb->len); 528 529 err = skb_zerocopy(user_skb, skb, skb->len, hlen); 530 if (err) 531 goto out; 532 533 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 534 pad_packet(dp, user_skb); 535 536 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 537 538 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 539 user_skb = NULL; 540 out: 541 if (err) 542 skb_tx_error(skb); 543 kfree_skb(user_skb); 544 kfree_skb(nskb); 545 return err; 546 } 547 548 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 549 { 550 struct ovs_header *ovs_header = info->userhdr; 551 struct net *net = sock_net(skb->sk); 552 struct nlattr **a = info->attrs; 553 struct sw_flow_actions *acts; 554 struct sk_buff *packet; 555 struct sw_flow *flow; 556 struct sw_flow_actions *sf_acts; 557 struct datapath *dp; 558 struct ethhdr *eth; 559 struct vport *input_vport; 560 u16 mru = 0; 561 int len; 562 int err; 563 bool log = !a[OVS_PACKET_ATTR_PROBE]; 564 565 err = -EINVAL; 566 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 567 !a[OVS_PACKET_ATTR_ACTIONS]) 568 goto err; 569 570 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 571 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 572 err = -ENOMEM; 573 if (!packet) 574 goto err; 575 skb_reserve(packet, NET_IP_ALIGN); 576 577 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 578 579 skb_reset_mac_header(packet); 580 eth = eth_hdr(packet); 581 582 /* Normally, setting the skb 'protocol' field would be handled by a 583 * call to eth_type_trans(), but it assumes there's a sending 584 * device, which we may not have. */ 585 if (eth_proto_is_802_3(eth->h_proto)) 586 packet->protocol = eth->h_proto; 587 else 588 packet->protocol = htons(ETH_P_802_2); 589 590 /* Set packet's mru */ 591 if (a[OVS_PACKET_ATTR_MRU]) { 592 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]); 593 packet->ignore_df = 1; 594 } 595 OVS_CB(packet)->mru = mru; 596 597 /* Build an sw_flow for sending this packet. */ 598 flow = ovs_flow_alloc(); 599 err = PTR_ERR(flow); 600 if (IS_ERR(flow)) 601 goto err_kfree_skb; 602 603 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY], 604 packet, &flow->key, log); 605 if (err) 606 goto err_flow_free; 607 608 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS], 609 &flow->key, &acts, log); 610 if (err) 611 goto err_flow_free; 612 613 rcu_assign_pointer(flow->sf_acts, acts); 614 packet->priority = flow->key.phy.priority; 615 packet->mark = flow->key.phy.skb_mark; 616 617 rcu_read_lock(); 618 dp = get_dp_rcu(net, ovs_header->dp_ifindex); 619 err = -ENODEV; 620 if (!dp) 621 goto err_unlock; 622 623 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 624 if (!input_vport) 625 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 626 627 if (!input_vport) 628 goto err_unlock; 629 630 packet->dev = input_vport->dev; 631 OVS_CB(packet)->input_vport = input_vport; 632 sf_acts = rcu_dereference(flow->sf_acts); 633 634 local_bh_disable(); 635 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); 636 local_bh_enable(); 637 rcu_read_unlock(); 638 639 ovs_flow_free(flow, false); 640 return err; 641 642 err_unlock: 643 rcu_read_unlock(); 644 err_flow_free: 645 ovs_flow_free(flow, false); 646 err_kfree_skb: 647 kfree_skb(packet); 648 err: 649 return err; 650 } 651 652 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 653 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 654 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 655 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 656 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, 657 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, 658 }; 659 660 static const struct genl_ops dp_packet_genl_ops[] = { 661 { .cmd = OVS_PACKET_CMD_EXECUTE, 662 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 663 .policy = packet_policy, 664 .doit = ovs_packet_cmd_execute 665 } 666 }; 667 668 static struct genl_family dp_packet_genl_family = { 669 .id = GENL_ID_GENERATE, 670 .hdrsize = sizeof(struct ovs_header), 671 .name = OVS_PACKET_FAMILY, 672 .version = OVS_PACKET_VERSION, 673 .maxattr = OVS_PACKET_ATTR_MAX, 674 .netnsok = true, 675 .parallel_ops = true, 676 .ops = dp_packet_genl_ops, 677 .n_ops = ARRAY_SIZE(dp_packet_genl_ops), 678 }; 679 680 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 681 struct ovs_dp_megaflow_stats *mega_stats) 682 { 683 int i; 684 685 memset(mega_stats, 0, sizeof(*mega_stats)); 686 687 stats->n_flows = ovs_flow_tbl_count(&dp->table); 688 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 689 690 stats->n_hit = stats->n_missed = stats->n_lost = 0; 691 692 for_each_possible_cpu(i) { 693 const struct dp_stats_percpu *percpu_stats; 694 struct dp_stats_percpu local_stats; 695 unsigned int start; 696 697 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 698 699 do { 700 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 701 local_stats = *percpu_stats; 702 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 703 704 stats->n_hit += local_stats.n_hit; 705 stats->n_missed += local_stats.n_missed; 706 stats->n_lost += local_stats.n_lost; 707 mega_stats->n_mask_hit += local_stats.n_mask_hit; 708 } 709 } 710 711 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) 712 { 713 return ovs_identifier_is_ufid(sfid) && 714 !(ufid_flags & OVS_UFID_F_OMIT_KEY); 715 } 716 717 static bool should_fill_mask(uint32_t ufid_flags) 718 { 719 return !(ufid_flags & OVS_UFID_F_OMIT_MASK); 720 } 721 722 static bool should_fill_actions(uint32_t ufid_flags) 723 { 724 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); 725 } 726 727 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, 728 const struct sw_flow_id *sfid, 729 uint32_t ufid_flags) 730 { 731 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); 732 733 /* OVS_FLOW_ATTR_UFID */ 734 if (sfid && ovs_identifier_is_ufid(sfid)) 735 len += nla_total_size(sfid->ufid_len); 736 737 /* OVS_FLOW_ATTR_KEY */ 738 if (!sfid || should_fill_key(sfid, ufid_flags)) 739 len += nla_total_size(ovs_key_attr_size()); 740 741 /* OVS_FLOW_ATTR_MASK */ 742 if (should_fill_mask(ufid_flags)) 743 len += nla_total_size(ovs_key_attr_size()); 744 745 /* OVS_FLOW_ATTR_ACTIONS */ 746 if (should_fill_actions(ufid_flags)) 747 len += nla_total_size(acts->orig_len); 748 749 return len 750 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 751 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 752 + nla_total_size(8); /* OVS_FLOW_ATTR_USED */ 753 } 754 755 /* Called with ovs_mutex or RCU read lock. */ 756 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 757 struct sk_buff *skb) 758 { 759 struct ovs_flow_stats stats; 760 __be16 tcp_flags; 761 unsigned long used; 762 763 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 764 765 if (used && 766 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used))) 767 return -EMSGSIZE; 768 769 if (stats.n_packets && 770 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats)) 771 return -EMSGSIZE; 772 773 if ((u8)ntohs(tcp_flags) && 774 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 775 return -EMSGSIZE; 776 777 return 0; 778 } 779 780 /* Called with ovs_mutex or RCU read lock. */ 781 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 782 struct sk_buff *skb, int skb_orig_len) 783 { 784 struct nlattr *start; 785 int err; 786 787 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 788 * this is the first flow to be dumped into 'skb'. This is unusual for 789 * Netlink but individual action lists can be longer than 790 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 791 * The userspace caller can always fetch the actions separately if it 792 * really wants them. (Most userspace callers in fact don't care.) 793 * 794 * This can only fail for dump operations because the skb is always 795 * properly sized for single flows. 796 */ 797 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS); 798 if (start) { 799 const struct sw_flow_actions *sf_acts; 800 801 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 802 err = ovs_nla_put_actions(sf_acts->actions, 803 sf_acts->actions_len, skb); 804 805 if (!err) 806 nla_nest_end(skb, start); 807 else { 808 if (skb_orig_len) 809 return err; 810 811 nla_nest_cancel(skb, start); 812 } 813 } else if (skb_orig_len) { 814 return -EMSGSIZE; 815 } 816 817 return 0; 818 } 819 820 /* Called with ovs_mutex or RCU read lock. */ 821 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 822 struct sk_buff *skb, u32 portid, 823 u32 seq, u32 flags, u8 cmd, u32 ufid_flags) 824 { 825 const int skb_orig_len = skb->len; 826 struct ovs_header *ovs_header; 827 int err; 828 829 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 830 flags, cmd); 831 if (!ovs_header) 832 return -EMSGSIZE; 833 834 ovs_header->dp_ifindex = dp_ifindex; 835 836 err = ovs_nla_put_identifier(flow, skb); 837 if (err) 838 goto error; 839 840 if (should_fill_key(&flow->id, ufid_flags)) { 841 err = ovs_nla_put_masked_key(flow, skb); 842 if (err) 843 goto error; 844 } 845 846 if (should_fill_mask(ufid_flags)) { 847 err = ovs_nla_put_mask(flow, skb); 848 if (err) 849 goto error; 850 } 851 852 err = ovs_flow_cmd_fill_stats(flow, skb); 853 if (err) 854 goto error; 855 856 if (should_fill_actions(ufid_flags)) { 857 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 858 if (err) 859 goto error; 860 } 861 862 genlmsg_end(skb, ovs_header); 863 return 0; 864 865 error: 866 genlmsg_cancel(skb, ovs_header); 867 return err; 868 } 869 870 /* May not be called with RCU read lock. */ 871 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 872 const struct sw_flow_id *sfid, 873 struct genl_info *info, 874 bool always, 875 uint32_t ufid_flags) 876 { 877 struct sk_buff *skb; 878 size_t len; 879 880 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 881 return NULL; 882 883 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); 884 skb = genlmsg_new_unicast(len, info, GFP_KERNEL); 885 if (!skb) 886 return ERR_PTR(-ENOMEM); 887 888 return skb; 889 } 890 891 /* Called with ovs_mutex. */ 892 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 893 int dp_ifindex, 894 struct genl_info *info, u8 cmd, 895 bool always, u32 ufid_flags) 896 { 897 struct sk_buff *skb; 898 int retval; 899 900 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), 901 &flow->id, info, always, ufid_flags); 902 if (IS_ERR_OR_NULL(skb)) 903 return skb; 904 905 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 906 info->snd_portid, info->snd_seq, 0, 907 cmd, ufid_flags); 908 BUG_ON(retval < 0); 909 return skb; 910 } 911 912 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 913 { 914 struct net *net = sock_net(skb->sk); 915 struct nlattr **a = info->attrs; 916 struct ovs_header *ovs_header = info->userhdr; 917 struct sw_flow *flow = NULL, *new_flow; 918 struct sw_flow_mask mask; 919 struct sk_buff *reply; 920 struct datapath *dp; 921 struct sw_flow_key key; 922 struct sw_flow_actions *acts; 923 struct sw_flow_match match; 924 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 925 int error; 926 bool log = !a[OVS_FLOW_ATTR_PROBE]; 927 928 /* Must have key and actions. */ 929 error = -EINVAL; 930 if (!a[OVS_FLOW_ATTR_KEY]) { 931 OVS_NLERR(log, "Flow key attr not present in new flow."); 932 goto error; 933 } 934 if (!a[OVS_FLOW_ATTR_ACTIONS]) { 935 OVS_NLERR(log, "Flow actions attr not present in new flow."); 936 goto error; 937 } 938 939 /* Most of the time we need to allocate a new flow, do it before 940 * locking. 941 */ 942 new_flow = ovs_flow_alloc(); 943 if (IS_ERR(new_flow)) { 944 error = PTR_ERR(new_flow); 945 goto error; 946 } 947 948 /* Extract key. */ 949 ovs_match_init(&match, &key, &mask); 950 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 951 a[OVS_FLOW_ATTR_MASK], log); 952 if (error) 953 goto err_kfree_flow; 954 955 ovs_flow_mask_key(&new_flow->key, &key, true, &mask); 956 957 /* Extract flow identifier. */ 958 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID], 959 &key, log); 960 if (error) 961 goto err_kfree_flow; 962 963 /* Validate actions. */ 964 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS], 965 &new_flow->key, &acts, log); 966 if (error) { 967 OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); 968 goto err_kfree_flow; 969 } 970 971 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false, 972 ufid_flags); 973 if (IS_ERR(reply)) { 974 error = PTR_ERR(reply); 975 goto err_kfree_acts; 976 } 977 978 ovs_lock(); 979 dp = get_dp(net, ovs_header->dp_ifindex); 980 if (unlikely(!dp)) { 981 error = -ENODEV; 982 goto err_unlock_ovs; 983 } 984 985 /* Check if this is a duplicate flow */ 986 if (ovs_identifier_is_ufid(&new_flow->id)) 987 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id); 988 if (!flow) 989 flow = ovs_flow_tbl_lookup(&dp->table, &key); 990 if (likely(!flow)) { 991 rcu_assign_pointer(new_flow->sf_acts, acts); 992 993 /* Put flow in bucket. */ 994 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 995 if (unlikely(error)) { 996 acts = NULL; 997 goto err_unlock_ovs; 998 } 999 1000 if (unlikely(reply)) { 1001 error = ovs_flow_cmd_fill_info(new_flow, 1002 ovs_header->dp_ifindex, 1003 reply, info->snd_portid, 1004 info->snd_seq, 0, 1005 OVS_FLOW_CMD_NEW, 1006 ufid_flags); 1007 BUG_ON(error < 0); 1008 } 1009 ovs_unlock(); 1010 } else { 1011 struct sw_flow_actions *old_acts; 1012 1013 /* Bail out if we're not allowed to modify an existing flow. 1014 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 1015 * because Generic Netlink treats the latter as a dump 1016 * request. We also accept NLM_F_EXCL in case that bug ever 1017 * gets fixed. 1018 */ 1019 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 1020 | NLM_F_EXCL))) { 1021 error = -EEXIST; 1022 goto err_unlock_ovs; 1023 } 1024 /* The flow identifier has to be the same for flow updates. 1025 * Look for any overlapping flow. 1026 */ 1027 if (unlikely(!ovs_flow_cmp(flow, &match))) { 1028 if (ovs_identifier_is_key(&flow->id)) 1029 flow = ovs_flow_tbl_lookup_exact(&dp->table, 1030 &match); 1031 else /* UFID matches but key is different */ 1032 flow = NULL; 1033 if (!flow) { 1034 error = -ENOENT; 1035 goto err_unlock_ovs; 1036 } 1037 } 1038 /* Update actions. */ 1039 old_acts = ovsl_dereference(flow->sf_acts); 1040 rcu_assign_pointer(flow->sf_acts, acts); 1041 1042 if (unlikely(reply)) { 1043 error = ovs_flow_cmd_fill_info(flow, 1044 ovs_header->dp_ifindex, 1045 reply, info->snd_portid, 1046 info->snd_seq, 0, 1047 OVS_FLOW_CMD_NEW, 1048 ufid_flags); 1049 BUG_ON(error < 0); 1050 } 1051 ovs_unlock(); 1052 1053 ovs_nla_free_flow_actions_rcu(old_acts); 1054 ovs_flow_free(new_flow, false); 1055 } 1056 1057 if (reply) 1058 ovs_notify(&dp_flow_genl_family, reply, info); 1059 return 0; 1060 1061 err_unlock_ovs: 1062 ovs_unlock(); 1063 kfree_skb(reply); 1064 err_kfree_acts: 1065 ovs_nla_free_flow_actions(acts); 1066 err_kfree_flow: 1067 ovs_flow_free(new_flow, false); 1068 error: 1069 return error; 1070 } 1071 1072 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ 1073 static struct sw_flow_actions *get_flow_actions(struct net *net, 1074 const struct nlattr *a, 1075 const struct sw_flow_key *key, 1076 const struct sw_flow_mask *mask, 1077 bool log) 1078 { 1079 struct sw_flow_actions *acts; 1080 struct sw_flow_key masked_key; 1081 int error; 1082 1083 ovs_flow_mask_key(&masked_key, key, true, mask); 1084 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log); 1085 if (error) { 1086 OVS_NLERR(log, 1087 "Actions may not be safe on all matching packets"); 1088 return ERR_PTR(error); 1089 } 1090 1091 return acts; 1092 } 1093 1094 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 1095 { 1096 struct net *net = sock_net(skb->sk); 1097 struct nlattr **a = info->attrs; 1098 struct ovs_header *ovs_header = info->userhdr; 1099 struct sw_flow_key key; 1100 struct sw_flow *flow; 1101 struct sw_flow_mask mask; 1102 struct sk_buff *reply = NULL; 1103 struct datapath *dp; 1104 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 1105 struct sw_flow_match match; 1106 struct sw_flow_id sfid; 1107 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1108 int error; 1109 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1110 bool ufid_present; 1111 1112 /* Extract key. */ 1113 error = -EINVAL; 1114 if (!a[OVS_FLOW_ATTR_KEY]) { 1115 OVS_NLERR(log, "Flow key attribute not present in set flow."); 1116 goto error; 1117 } 1118 1119 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); 1120 ovs_match_init(&match, &key, &mask); 1121 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1122 a[OVS_FLOW_ATTR_MASK], log); 1123 if (error) 1124 goto error; 1125 1126 /* Validate actions. */ 1127 if (a[OVS_FLOW_ATTR_ACTIONS]) { 1128 acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key, 1129 &mask, log); 1130 if (IS_ERR(acts)) { 1131 error = PTR_ERR(acts); 1132 goto error; 1133 } 1134 1135 /* Can allocate before locking if have acts. */ 1136 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false, 1137 ufid_flags); 1138 if (IS_ERR(reply)) { 1139 error = PTR_ERR(reply); 1140 goto err_kfree_acts; 1141 } 1142 } 1143 1144 ovs_lock(); 1145 dp = get_dp(net, ovs_header->dp_ifindex); 1146 if (unlikely(!dp)) { 1147 error = -ENODEV; 1148 goto err_unlock_ovs; 1149 } 1150 /* Check that the flow exists. */ 1151 if (ufid_present) 1152 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid); 1153 else 1154 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1155 if (unlikely(!flow)) { 1156 error = -ENOENT; 1157 goto err_unlock_ovs; 1158 } 1159 1160 /* Update actions, if present. */ 1161 if (likely(acts)) { 1162 old_acts = ovsl_dereference(flow->sf_acts); 1163 rcu_assign_pointer(flow->sf_acts, acts); 1164 1165 if (unlikely(reply)) { 1166 error = ovs_flow_cmd_fill_info(flow, 1167 ovs_header->dp_ifindex, 1168 reply, info->snd_portid, 1169 info->snd_seq, 0, 1170 OVS_FLOW_CMD_NEW, 1171 ufid_flags); 1172 BUG_ON(error < 0); 1173 } 1174 } else { 1175 /* Could not alloc without acts before locking. */ 1176 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1177 info, OVS_FLOW_CMD_NEW, false, 1178 ufid_flags); 1179 1180 if (unlikely(IS_ERR(reply))) { 1181 error = PTR_ERR(reply); 1182 goto err_unlock_ovs; 1183 } 1184 } 1185 1186 /* Clear stats. */ 1187 if (a[OVS_FLOW_ATTR_CLEAR]) 1188 ovs_flow_stats_clear(flow); 1189 ovs_unlock(); 1190 1191 if (reply) 1192 ovs_notify(&dp_flow_genl_family, reply, info); 1193 if (old_acts) 1194 ovs_nla_free_flow_actions_rcu(old_acts); 1195 1196 return 0; 1197 1198 err_unlock_ovs: 1199 ovs_unlock(); 1200 kfree_skb(reply); 1201 err_kfree_acts: 1202 ovs_nla_free_flow_actions(acts); 1203 error: 1204 return error; 1205 } 1206 1207 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1208 { 1209 struct nlattr **a = info->attrs; 1210 struct ovs_header *ovs_header = info->userhdr; 1211 struct net *net = sock_net(skb->sk); 1212 struct sw_flow_key key; 1213 struct sk_buff *reply; 1214 struct sw_flow *flow; 1215 struct datapath *dp; 1216 struct sw_flow_match match; 1217 struct sw_flow_id ufid; 1218 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1219 int err = 0; 1220 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1221 bool ufid_present; 1222 1223 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1224 if (a[OVS_FLOW_ATTR_KEY]) { 1225 ovs_match_init(&match, &key, NULL); 1226 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL, 1227 log); 1228 } else if (!ufid_present) { 1229 OVS_NLERR(log, 1230 "Flow get message rejected, Key attribute missing."); 1231 err = -EINVAL; 1232 } 1233 if (err) 1234 return err; 1235 1236 ovs_lock(); 1237 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1238 if (!dp) { 1239 err = -ENODEV; 1240 goto unlock; 1241 } 1242 1243 if (ufid_present) 1244 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1245 else 1246 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1247 if (!flow) { 1248 err = -ENOENT; 1249 goto unlock; 1250 } 1251 1252 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1253 OVS_FLOW_CMD_NEW, true, ufid_flags); 1254 if (IS_ERR(reply)) { 1255 err = PTR_ERR(reply); 1256 goto unlock; 1257 } 1258 1259 ovs_unlock(); 1260 return genlmsg_reply(reply, info); 1261 unlock: 1262 ovs_unlock(); 1263 return err; 1264 } 1265 1266 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1267 { 1268 struct nlattr **a = info->attrs; 1269 struct ovs_header *ovs_header = info->userhdr; 1270 struct net *net = sock_net(skb->sk); 1271 struct sw_flow_key key; 1272 struct sk_buff *reply; 1273 struct sw_flow *flow = NULL; 1274 struct datapath *dp; 1275 struct sw_flow_match match; 1276 struct sw_flow_id ufid; 1277 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1278 int err; 1279 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1280 bool ufid_present; 1281 1282 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1283 if (a[OVS_FLOW_ATTR_KEY]) { 1284 ovs_match_init(&match, &key, NULL); 1285 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1286 NULL, log); 1287 if (unlikely(err)) 1288 return err; 1289 } 1290 1291 ovs_lock(); 1292 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1293 if (unlikely(!dp)) { 1294 err = -ENODEV; 1295 goto unlock; 1296 } 1297 1298 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) { 1299 err = ovs_flow_tbl_flush(&dp->table); 1300 goto unlock; 1301 } 1302 1303 if (ufid_present) 1304 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1305 else 1306 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1307 if (unlikely(!flow)) { 1308 err = -ENOENT; 1309 goto unlock; 1310 } 1311 1312 ovs_flow_tbl_remove(&dp->table, flow); 1313 ovs_unlock(); 1314 1315 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1316 &flow->id, info, false, ufid_flags); 1317 if (likely(reply)) { 1318 if (likely(!IS_ERR(reply))) { 1319 rcu_read_lock(); /*To keep RCU checker happy. */ 1320 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1321 reply, info->snd_portid, 1322 info->snd_seq, 0, 1323 OVS_FLOW_CMD_DEL, 1324 ufid_flags); 1325 rcu_read_unlock(); 1326 BUG_ON(err < 0); 1327 1328 ovs_notify(&dp_flow_genl_family, reply, info); 1329 } else { 1330 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply)); 1331 } 1332 } 1333 1334 ovs_flow_free(flow, true); 1335 return 0; 1336 unlock: 1337 ovs_unlock(); 1338 return err; 1339 } 1340 1341 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1342 { 1343 struct nlattr *a[__OVS_FLOW_ATTR_MAX]; 1344 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1345 struct table_instance *ti; 1346 struct datapath *dp; 1347 u32 ufid_flags; 1348 int err; 1349 1350 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a, 1351 OVS_FLOW_ATTR_MAX, flow_policy); 1352 if (err) 1353 return err; 1354 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1355 1356 rcu_read_lock(); 1357 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1358 if (!dp) { 1359 rcu_read_unlock(); 1360 return -ENODEV; 1361 } 1362 1363 ti = rcu_dereference(dp->table.ti); 1364 for (;;) { 1365 struct sw_flow *flow; 1366 u32 bucket, obj; 1367 1368 bucket = cb->args[0]; 1369 obj = cb->args[1]; 1370 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1371 if (!flow) 1372 break; 1373 1374 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1375 NETLINK_CB(cb->skb).portid, 1376 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1377 OVS_FLOW_CMD_NEW, ufid_flags) < 0) 1378 break; 1379 1380 cb->args[0] = bucket; 1381 cb->args[1] = obj; 1382 } 1383 rcu_read_unlock(); 1384 return skb->len; 1385 } 1386 1387 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1388 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1389 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1390 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1391 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1392 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1393 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, 1394 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, 1395 }; 1396 1397 static const struct genl_ops dp_flow_genl_ops[] = { 1398 { .cmd = OVS_FLOW_CMD_NEW, 1399 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1400 .policy = flow_policy, 1401 .doit = ovs_flow_cmd_new 1402 }, 1403 { .cmd = OVS_FLOW_CMD_DEL, 1404 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1405 .policy = flow_policy, 1406 .doit = ovs_flow_cmd_del 1407 }, 1408 { .cmd = OVS_FLOW_CMD_GET, 1409 .flags = 0, /* OK for unprivileged users. */ 1410 .policy = flow_policy, 1411 .doit = ovs_flow_cmd_get, 1412 .dumpit = ovs_flow_cmd_dump 1413 }, 1414 { .cmd = OVS_FLOW_CMD_SET, 1415 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1416 .policy = flow_policy, 1417 .doit = ovs_flow_cmd_set, 1418 }, 1419 }; 1420 1421 static struct genl_family dp_flow_genl_family = { 1422 .id = GENL_ID_GENERATE, 1423 .hdrsize = sizeof(struct ovs_header), 1424 .name = OVS_FLOW_FAMILY, 1425 .version = OVS_FLOW_VERSION, 1426 .maxattr = OVS_FLOW_ATTR_MAX, 1427 .netnsok = true, 1428 .parallel_ops = true, 1429 .ops = dp_flow_genl_ops, 1430 .n_ops = ARRAY_SIZE(dp_flow_genl_ops), 1431 .mcgrps = &ovs_dp_flow_multicast_group, 1432 .n_mcgrps = 1, 1433 }; 1434 1435 static size_t ovs_dp_cmd_msg_size(void) 1436 { 1437 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1438 1439 msgsize += nla_total_size(IFNAMSIZ); 1440 msgsize += nla_total_size(sizeof(struct ovs_dp_stats)); 1441 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats)); 1442 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1443 1444 return msgsize; 1445 } 1446 1447 /* Called with ovs_mutex. */ 1448 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1449 u32 portid, u32 seq, u32 flags, u8 cmd) 1450 { 1451 struct ovs_header *ovs_header; 1452 struct ovs_dp_stats dp_stats; 1453 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1454 int err; 1455 1456 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1457 flags, cmd); 1458 if (!ovs_header) 1459 goto error; 1460 1461 ovs_header->dp_ifindex = get_dpifindex(dp); 1462 1463 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1464 if (err) 1465 goto nla_put_failure; 1466 1467 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1468 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1469 &dp_stats)) 1470 goto nla_put_failure; 1471 1472 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1473 sizeof(struct ovs_dp_megaflow_stats), 1474 &dp_megaflow_stats)) 1475 goto nla_put_failure; 1476 1477 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1478 goto nla_put_failure; 1479 1480 genlmsg_end(skb, ovs_header); 1481 return 0; 1482 1483 nla_put_failure: 1484 genlmsg_cancel(skb, ovs_header); 1485 error: 1486 return -EMSGSIZE; 1487 } 1488 1489 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info) 1490 { 1491 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL); 1492 } 1493 1494 /* Called with rcu_read_lock or ovs_mutex. */ 1495 static struct datapath *lookup_datapath(struct net *net, 1496 const struct ovs_header *ovs_header, 1497 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1498 { 1499 struct datapath *dp; 1500 1501 if (!a[OVS_DP_ATTR_NAME]) 1502 dp = get_dp(net, ovs_header->dp_ifindex); 1503 else { 1504 struct vport *vport; 1505 1506 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1507 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1508 } 1509 return dp ? dp : ERR_PTR(-ENODEV); 1510 } 1511 1512 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info) 1513 { 1514 struct datapath *dp; 1515 1516 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1517 if (IS_ERR(dp)) 1518 return; 1519 1520 WARN(dp->user_features, "Dropping previously announced user features\n"); 1521 dp->user_features = 0; 1522 } 1523 1524 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1525 { 1526 if (a[OVS_DP_ATTR_USER_FEATURES]) 1527 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1528 } 1529 1530 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1531 { 1532 struct nlattr **a = info->attrs; 1533 struct vport_parms parms; 1534 struct sk_buff *reply; 1535 struct datapath *dp; 1536 struct vport *vport; 1537 struct ovs_net *ovs_net; 1538 int err, i; 1539 1540 err = -EINVAL; 1541 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1542 goto err; 1543 1544 reply = ovs_dp_cmd_alloc_info(info); 1545 if (!reply) 1546 return -ENOMEM; 1547 1548 err = -ENOMEM; 1549 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1550 if (dp == NULL) 1551 goto err_free_reply; 1552 1553 ovs_dp_set_net(dp, sock_net(skb->sk)); 1554 1555 /* Allocate table. */ 1556 err = ovs_flow_tbl_init(&dp->table); 1557 if (err) 1558 goto err_free_dp; 1559 1560 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1561 if (!dp->stats_percpu) { 1562 err = -ENOMEM; 1563 goto err_destroy_table; 1564 } 1565 1566 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head), 1567 GFP_KERNEL); 1568 if (!dp->ports) { 1569 err = -ENOMEM; 1570 goto err_destroy_percpu; 1571 } 1572 1573 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1574 INIT_HLIST_HEAD(&dp->ports[i]); 1575 1576 /* Set up our datapath device. */ 1577 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1578 parms.type = OVS_VPORT_TYPE_INTERNAL; 1579 parms.options = NULL; 1580 parms.dp = dp; 1581 parms.port_no = OVSP_LOCAL; 1582 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1583 1584 ovs_dp_change(dp, a); 1585 1586 /* So far only local changes have been made, now need the lock. */ 1587 ovs_lock(); 1588 1589 vport = new_vport(&parms); 1590 if (IS_ERR(vport)) { 1591 err = PTR_ERR(vport); 1592 if (err == -EBUSY) 1593 err = -EEXIST; 1594 1595 if (err == -EEXIST) { 1596 /* An outdated user space instance that does not understand 1597 * the concept of user_features has attempted to create a new 1598 * datapath and is likely to reuse it. Drop all user features. 1599 */ 1600 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1601 ovs_dp_reset_user_features(skb, info); 1602 } 1603 1604 goto err_destroy_ports_array; 1605 } 1606 1607 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1608 info->snd_seq, 0, OVS_DP_CMD_NEW); 1609 BUG_ON(err < 0); 1610 1611 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1612 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1613 1614 ovs_unlock(); 1615 1616 ovs_notify(&dp_datapath_genl_family, reply, info); 1617 return 0; 1618 1619 err_destroy_ports_array: 1620 ovs_unlock(); 1621 kfree(dp->ports); 1622 err_destroy_percpu: 1623 free_percpu(dp->stats_percpu); 1624 err_destroy_table: 1625 ovs_flow_tbl_destroy(&dp->table); 1626 err_free_dp: 1627 kfree(dp); 1628 err_free_reply: 1629 kfree_skb(reply); 1630 err: 1631 return err; 1632 } 1633 1634 /* Called with ovs_mutex. */ 1635 static void __dp_destroy(struct datapath *dp) 1636 { 1637 int i; 1638 1639 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1640 struct vport *vport; 1641 struct hlist_node *n; 1642 1643 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1644 if (vport->port_no != OVSP_LOCAL) 1645 ovs_dp_detach_port(vport); 1646 } 1647 1648 list_del_rcu(&dp->list_node); 1649 1650 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1651 * all ports in datapath are destroyed first before freeing datapath. 1652 */ 1653 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1654 1655 /* RCU destroy the flow table */ 1656 call_rcu(&dp->rcu, destroy_dp_rcu); 1657 } 1658 1659 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1660 { 1661 struct sk_buff *reply; 1662 struct datapath *dp; 1663 int err; 1664 1665 reply = ovs_dp_cmd_alloc_info(info); 1666 if (!reply) 1667 return -ENOMEM; 1668 1669 ovs_lock(); 1670 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1671 err = PTR_ERR(dp); 1672 if (IS_ERR(dp)) 1673 goto err_unlock_free; 1674 1675 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1676 info->snd_seq, 0, OVS_DP_CMD_DEL); 1677 BUG_ON(err < 0); 1678 1679 __dp_destroy(dp); 1680 ovs_unlock(); 1681 1682 ovs_notify(&dp_datapath_genl_family, reply, info); 1683 1684 return 0; 1685 1686 err_unlock_free: 1687 ovs_unlock(); 1688 kfree_skb(reply); 1689 return err; 1690 } 1691 1692 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1693 { 1694 struct sk_buff *reply; 1695 struct datapath *dp; 1696 int err; 1697 1698 reply = ovs_dp_cmd_alloc_info(info); 1699 if (!reply) 1700 return -ENOMEM; 1701 1702 ovs_lock(); 1703 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1704 err = PTR_ERR(dp); 1705 if (IS_ERR(dp)) 1706 goto err_unlock_free; 1707 1708 ovs_dp_change(dp, info->attrs); 1709 1710 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1711 info->snd_seq, 0, OVS_DP_CMD_NEW); 1712 BUG_ON(err < 0); 1713 1714 ovs_unlock(); 1715 ovs_notify(&dp_datapath_genl_family, reply, info); 1716 1717 return 0; 1718 1719 err_unlock_free: 1720 ovs_unlock(); 1721 kfree_skb(reply); 1722 return err; 1723 } 1724 1725 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1726 { 1727 struct sk_buff *reply; 1728 struct datapath *dp; 1729 int err; 1730 1731 reply = ovs_dp_cmd_alloc_info(info); 1732 if (!reply) 1733 return -ENOMEM; 1734 1735 ovs_lock(); 1736 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1737 if (IS_ERR(dp)) { 1738 err = PTR_ERR(dp); 1739 goto err_unlock_free; 1740 } 1741 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1742 info->snd_seq, 0, OVS_DP_CMD_NEW); 1743 BUG_ON(err < 0); 1744 ovs_unlock(); 1745 1746 return genlmsg_reply(reply, info); 1747 1748 err_unlock_free: 1749 ovs_unlock(); 1750 kfree_skb(reply); 1751 return err; 1752 } 1753 1754 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1755 { 1756 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1757 struct datapath *dp; 1758 int skip = cb->args[0]; 1759 int i = 0; 1760 1761 ovs_lock(); 1762 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1763 if (i >= skip && 1764 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1765 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1766 OVS_DP_CMD_NEW) < 0) 1767 break; 1768 i++; 1769 } 1770 ovs_unlock(); 1771 1772 cb->args[0] = i; 1773 1774 return skb->len; 1775 } 1776 1777 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1778 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1779 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1780 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1781 }; 1782 1783 static const struct genl_ops dp_datapath_genl_ops[] = { 1784 { .cmd = OVS_DP_CMD_NEW, 1785 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1786 .policy = datapath_policy, 1787 .doit = ovs_dp_cmd_new 1788 }, 1789 { .cmd = OVS_DP_CMD_DEL, 1790 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1791 .policy = datapath_policy, 1792 .doit = ovs_dp_cmd_del 1793 }, 1794 { .cmd = OVS_DP_CMD_GET, 1795 .flags = 0, /* OK for unprivileged users. */ 1796 .policy = datapath_policy, 1797 .doit = ovs_dp_cmd_get, 1798 .dumpit = ovs_dp_cmd_dump 1799 }, 1800 { .cmd = OVS_DP_CMD_SET, 1801 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1802 .policy = datapath_policy, 1803 .doit = ovs_dp_cmd_set, 1804 }, 1805 }; 1806 1807 static struct genl_family dp_datapath_genl_family = { 1808 .id = GENL_ID_GENERATE, 1809 .hdrsize = sizeof(struct ovs_header), 1810 .name = OVS_DATAPATH_FAMILY, 1811 .version = OVS_DATAPATH_VERSION, 1812 .maxattr = OVS_DP_ATTR_MAX, 1813 .netnsok = true, 1814 .parallel_ops = true, 1815 .ops = dp_datapath_genl_ops, 1816 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops), 1817 .mcgrps = &ovs_dp_datapath_multicast_group, 1818 .n_mcgrps = 1, 1819 }; 1820 1821 /* Called with ovs_mutex or RCU read lock. */ 1822 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1823 u32 portid, u32 seq, u32 flags, u8 cmd) 1824 { 1825 struct ovs_header *ovs_header; 1826 struct ovs_vport_stats vport_stats; 1827 int err; 1828 1829 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1830 flags, cmd); 1831 if (!ovs_header) 1832 return -EMSGSIZE; 1833 1834 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1835 1836 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1837 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1838 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 1839 ovs_vport_name(vport))) 1840 goto nla_put_failure; 1841 1842 ovs_vport_get_stats(vport, &vport_stats); 1843 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), 1844 &vport_stats)) 1845 goto nla_put_failure; 1846 1847 if (ovs_vport_get_upcall_portids(vport, skb)) 1848 goto nla_put_failure; 1849 1850 err = ovs_vport_get_options(vport, skb); 1851 if (err == -EMSGSIZE) 1852 goto error; 1853 1854 genlmsg_end(skb, ovs_header); 1855 return 0; 1856 1857 nla_put_failure: 1858 err = -EMSGSIZE; 1859 error: 1860 genlmsg_cancel(skb, ovs_header); 1861 return err; 1862 } 1863 1864 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 1865 { 1866 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1867 } 1868 1869 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 1870 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid, 1871 u32 seq, u8 cmd) 1872 { 1873 struct sk_buff *skb; 1874 int retval; 1875 1876 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1877 if (!skb) 1878 return ERR_PTR(-ENOMEM); 1879 1880 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd); 1881 BUG_ON(retval < 0); 1882 1883 return skb; 1884 } 1885 1886 /* Called with ovs_mutex or RCU read lock. */ 1887 static struct vport *lookup_vport(struct net *net, 1888 const struct ovs_header *ovs_header, 1889 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1890 { 1891 struct datapath *dp; 1892 struct vport *vport; 1893 1894 if (a[OVS_VPORT_ATTR_NAME]) { 1895 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 1896 if (!vport) 1897 return ERR_PTR(-ENODEV); 1898 if (ovs_header->dp_ifindex && 1899 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 1900 return ERR_PTR(-ENODEV); 1901 return vport; 1902 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 1903 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1904 1905 if (port_no >= DP_MAX_PORTS) 1906 return ERR_PTR(-EFBIG); 1907 1908 dp = get_dp(net, ovs_header->dp_ifindex); 1909 if (!dp) 1910 return ERR_PTR(-ENODEV); 1911 1912 vport = ovs_vport_ovsl_rcu(dp, port_no); 1913 if (!vport) 1914 return ERR_PTR(-ENODEV); 1915 return vport; 1916 } else 1917 return ERR_PTR(-EINVAL); 1918 } 1919 1920 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 1921 { 1922 struct nlattr **a = info->attrs; 1923 struct ovs_header *ovs_header = info->userhdr; 1924 struct vport_parms parms; 1925 struct sk_buff *reply; 1926 struct vport *vport; 1927 struct datapath *dp; 1928 u32 port_no; 1929 int err; 1930 1931 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 1932 !a[OVS_VPORT_ATTR_UPCALL_PID]) 1933 return -EINVAL; 1934 1935 port_no = a[OVS_VPORT_ATTR_PORT_NO] 1936 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 1937 if (port_no >= DP_MAX_PORTS) 1938 return -EFBIG; 1939 1940 reply = ovs_vport_cmd_alloc_info(); 1941 if (!reply) 1942 return -ENOMEM; 1943 1944 ovs_lock(); 1945 restart: 1946 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1947 err = -ENODEV; 1948 if (!dp) 1949 goto exit_unlock_free; 1950 1951 if (port_no) { 1952 vport = ovs_vport_ovsl(dp, port_no); 1953 err = -EBUSY; 1954 if (vport) 1955 goto exit_unlock_free; 1956 } else { 1957 for (port_no = 1; ; port_no++) { 1958 if (port_no >= DP_MAX_PORTS) { 1959 err = -EFBIG; 1960 goto exit_unlock_free; 1961 } 1962 vport = ovs_vport_ovsl(dp, port_no); 1963 if (!vport) 1964 break; 1965 } 1966 } 1967 1968 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 1969 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 1970 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 1971 parms.dp = dp; 1972 parms.port_no = port_no; 1973 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 1974 1975 vport = new_vport(&parms); 1976 err = PTR_ERR(vport); 1977 if (IS_ERR(vport)) { 1978 if (err == -EAGAIN) 1979 goto restart; 1980 goto exit_unlock_free; 1981 } 1982 1983 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 1984 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 1985 BUG_ON(err < 0); 1986 ovs_unlock(); 1987 1988 ovs_notify(&dp_vport_genl_family, reply, info); 1989 return 0; 1990 1991 exit_unlock_free: 1992 ovs_unlock(); 1993 kfree_skb(reply); 1994 return err; 1995 } 1996 1997 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 1998 { 1999 struct nlattr **a = info->attrs; 2000 struct sk_buff *reply; 2001 struct vport *vport; 2002 int err; 2003 2004 reply = ovs_vport_cmd_alloc_info(); 2005 if (!reply) 2006 return -ENOMEM; 2007 2008 ovs_lock(); 2009 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2010 err = PTR_ERR(vport); 2011 if (IS_ERR(vport)) 2012 goto exit_unlock_free; 2013 2014 if (a[OVS_VPORT_ATTR_TYPE] && 2015 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 2016 err = -EINVAL; 2017 goto exit_unlock_free; 2018 } 2019 2020 if (a[OVS_VPORT_ATTR_OPTIONS]) { 2021 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 2022 if (err) 2023 goto exit_unlock_free; 2024 } 2025 2026 2027 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 2028 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2029 2030 err = ovs_vport_set_upcall_portids(vport, ids); 2031 if (err) 2032 goto exit_unlock_free; 2033 } 2034 2035 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 2036 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 2037 BUG_ON(err < 0); 2038 2039 ovs_unlock(); 2040 ovs_notify(&dp_vport_genl_family, reply, info); 2041 return 0; 2042 2043 exit_unlock_free: 2044 ovs_unlock(); 2045 kfree_skb(reply); 2046 return err; 2047 } 2048 2049 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2050 { 2051 struct nlattr **a = info->attrs; 2052 struct sk_buff *reply; 2053 struct vport *vport; 2054 int err; 2055 2056 reply = ovs_vport_cmd_alloc_info(); 2057 if (!reply) 2058 return -ENOMEM; 2059 2060 ovs_lock(); 2061 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2062 err = PTR_ERR(vport); 2063 if (IS_ERR(vport)) 2064 goto exit_unlock_free; 2065 2066 if (vport->port_no == OVSP_LOCAL) { 2067 err = -EINVAL; 2068 goto exit_unlock_free; 2069 } 2070 2071 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 2072 info->snd_seq, 0, OVS_VPORT_CMD_DEL); 2073 BUG_ON(err < 0); 2074 ovs_dp_detach_port(vport); 2075 ovs_unlock(); 2076 2077 ovs_notify(&dp_vport_genl_family, reply, info); 2078 return 0; 2079 2080 exit_unlock_free: 2081 ovs_unlock(); 2082 kfree_skb(reply); 2083 return err; 2084 } 2085 2086 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2087 { 2088 struct nlattr **a = info->attrs; 2089 struct ovs_header *ovs_header = info->userhdr; 2090 struct sk_buff *reply; 2091 struct vport *vport; 2092 int err; 2093 2094 reply = ovs_vport_cmd_alloc_info(); 2095 if (!reply) 2096 return -ENOMEM; 2097 2098 rcu_read_lock(); 2099 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2100 err = PTR_ERR(vport); 2101 if (IS_ERR(vport)) 2102 goto exit_unlock_free; 2103 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 2104 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 2105 BUG_ON(err < 0); 2106 rcu_read_unlock(); 2107 2108 return genlmsg_reply(reply, info); 2109 2110 exit_unlock_free: 2111 rcu_read_unlock(); 2112 kfree_skb(reply); 2113 return err; 2114 } 2115 2116 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2117 { 2118 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2119 struct datapath *dp; 2120 int bucket = cb->args[0], skip = cb->args[1]; 2121 int i, j = 0; 2122 2123 rcu_read_lock(); 2124 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2125 if (!dp) { 2126 rcu_read_unlock(); 2127 return -ENODEV; 2128 } 2129 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2130 struct vport *vport; 2131 2132 j = 0; 2133 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2134 if (j >= skip && 2135 ovs_vport_cmd_fill_info(vport, skb, 2136 NETLINK_CB(cb->skb).portid, 2137 cb->nlh->nlmsg_seq, 2138 NLM_F_MULTI, 2139 OVS_VPORT_CMD_NEW) < 0) 2140 goto out; 2141 2142 j++; 2143 } 2144 skip = 0; 2145 } 2146 out: 2147 rcu_read_unlock(); 2148 2149 cb->args[0] = i; 2150 cb->args[1] = j; 2151 2152 return skb->len; 2153 } 2154 2155 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2156 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2157 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2158 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2159 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2160 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 2161 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2162 }; 2163 2164 static const struct genl_ops dp_vport_genl_ops[] = { 2165 { .cmd = OVS_VPORT_CMD_NEW, 2166 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2167 .policy = vport_policy, 2168 .doit = ovs_vport_cmd_new 2169 }, 2170 { .cmd = OVS_VPORT_CMD_DEL, 2171 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2172 .policy = vport_policy, 2173 .doit = ovs_vport_cmd_del 2174 }, 2175 { .cmd = OVS_VPORT_CMD_GET, 2176 .flags = 0, /* OK for unprivileged users. */ 2177 .policy = vport_policy, 2178 .doit = ovs_vport_cmd_get, 2179 .dumpit = ovs_vport_cmd_dump 2180 }, 2181 { .cmd = OVS_VPORT_CMD_SET, 2182 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2183 .policy = vport_policy, 2184 .doit = ovs_vport_cmd_set, 2185 }, 2186 }; 2187 2188 struct genl_family dp_vport_genl_family = { 2189 .id = GENL_ID_GENERATE, 2190 .hdrsize = sizeof(struct ovs_header), 2191 .name = OVS_VPORT_FAMILY, 2192 .version = OVS_VPORT_VERSION, 2193 .maxattr = OVS_VPORT_ATTR_MAX, 2194 .netnsok = true, 2195 .parallel_ops = true, 2196 .ops = dp_vport_genl_ops, 2197 .n_ops = ARRAY_SIZE(dp_vport_genl_ops), 2198 .mcgrps = &ovs_dp_vport_multicast_group, 2199 .n_mcgrps = 1, 2200 }; 2201 2202 static struct genl_family * const dp_genl_families[] = { 2203 &dp_datapath_genl_family, 2204 &dp_vport_genl_family, 2205 &dp_flow_genl_family, 2206 &dp_packet_genl_family, 2207 }; 2208 2209 static void dp_unregister_genl(int n_families) 2210 { 2211 int i; 2212 2213 for (i = 0; i < n_families; i++) 2214 genl_unregister_family(dp_genl_families[i]); 2215 } 2216 2217 static int dp_register_genl(void) 2218 { 2219 int err; 2220 int i; 2221 2222 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2223 2224 err = genl_register_family(dp_genl_families[i]); 2225 if (err) 2226 goto error; 2227 } 2228 2229 return 0; 2230 2231 error: 2232 dp_unregister_genl(i); 2233 return err; 2234 } 2235 2236 static int __net_init ovs_init_net(struct net *net) 2237 { 2238 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2239 2240 INIT_LIST_HEAD(&ovs_net->dps); 2241 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2242 ovs_ct_init(net); 2243 return 0; 2244 } 2245 2246 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2247 struct list_head *head) 2248 { 2249 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2250 struct datapath *dp; 2251 2252 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2253 int i; 2254 2255 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2256 struct vport *vport; 2257 2258 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2259 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2260 continue; 2261 2262 if (dev_net(vport->dev) == dnet) 2263 list_add(&vport->detach_list, head); 2264 } 2265 } 2266 } 2267 } 2268 2269 static void __net_exit ovs_exit_net(struct net *dnet) 2270 { 2271 struct datapath *dp, *dp_next; 2272 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2273 struct vport *vport, *vport_next; 2274 struct net *net; 2275 LIST_HEAD(head); 2276 2277 ovs_ct_exit(dnet); 2278 ovs_lock(); 2279 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2280 __dp_destroy(dp); 2281 2282 rtnl_lock(); 2283 for_each_net(net) 2284 list_vports_from_net(net, dnet, &head); 2285 rtnl_unlock(); 2286 2287 /* Detach all vports from given namespace. */ 2288 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2289 list_del(&vport->detach_list); 2290 ovs_dp_detach_port(vport); 2291 } 2292 2293 ovs_unlock(); 2294 2295 cancel_work_sync(&ovs_net->dp_notify_work); 2296 } 2297 2298 static struct pernet_operations ovs_net_ops = { 2299 .init = ovs_init_net, 2300 .exit = ovs_exit_net, 2301 .id = &ovs_net_id, 2302 .size = sizeof(struct ovs_net), 2303 }; 2304 2305 static int __init dp_init(void) 2306 { 2307 int err; 2308 2309 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); 2310 2311 pr_info("Open vSwitch switching datapath\n"); 2312 2313 err = action_fifos_init(); 2314 if (err) 2315 goto error; 2316 2317 err = ovs_internal_dev_rtnl_link_register(); 2318 if (err) 2319 goto error_action_fifos_exit; 2320 2321 err = ovs_flow_init(); 2322 if (err) 2323 goto error_unreg_rtnl_link; 2324 2325 err = ovs_vport_init(); 2326 if (err) 2327 goto error_flow_exit; 2328 2329 err = register_pernet_device(&ovs_net_ops); 2330 if (err) 2331 goto error_vport_exit; 2332 2333 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2334 if (err) 2335 goto error_netns_exit; 2336 2337 err = ovs_netdev_init(); 2338 if (err) 2339 goto error_unreg_notifier; 2340 2341 err = dp_register_genl(); 2342 if (err < 0) 2343 goto error_unreg_netdev; 2344 2345 return 0; 2346 2347 error_unreg_netdev: 2348 ovs_netdev_exit(); 2349 error_unreg_notifier: 2350 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2351 error_netns_exit: 2352 unregister_pernet_device(&ovs_net_ops); 2353 error_vport_exit: 2354 ovs_vport_exit(); 2355 error_flow_exit: 2356 ovs_flow_exit(); 2357 error_unreg_rtnl_link: 2358 ovs_internal_dev_rtnl_link_unregister(); 2359 error_action_fifos_exit: 2360 action_fifos_exit(); 2361 error: 2362 return err; 2363 } 2364 2365 static void dp_cleanup(void) 2366 { 2367 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2368 ovs_netdev_exit(); 2369 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2370 unregister_pernet_device(&ovs_net_ops); 2371 rcu_barrier(); 2372 ovs_vport_exit(); 2373 ovs_flow_exit(); 2374 ovs_internal_dev_rtnl_link_unregister(); 2375 action_fifos_exit(); 2376 } 2377 2378 module_init(dp_init); 2379 module_exit(dp_cleanup); 2380 2381 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2382 MODULE_LICENSE("GPL"); 2383