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 63 static struct genl_family dp_packet_genl_family; 64 static struct genl_family dp_flow_genl_family; 65 static struct genl_family dp_datapath_genl_family; 66 67 static const struct genl_multicast_group ovs_dp_flow_multicast_group = { 68 .name = OVS_FLOW_MCGROUP, 69 }; 70 71 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = { 72 .name = OVS_DATAPATH_MCGROUP, 73 }; 74 75 static const struct genl_multicast_group ovs_dp_vport_multicast_group = { 76 .name = OVS_VPORT_MCGROUP, 77 }; 78 79 /* Check if need to build a reply message. 80 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */ 81 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info, 82 unsigned int group) 83 { 84 return info->nlhdr->nlmsg_flags & NLM_F_ECHO || 85 genl_has_listeners(family, genl_info_net(info)->genl_sock, 86 group); 87 } 88 89 static void ovs_notify(struct genl_family *family, 90 struct sk_buff *skb, struct genl_info *info) 91 { 92 genl_notify(family, skb, genl_info_net(info), info->snd_portid, 93 0, info->nlhdr, GFP_KERNEL); 94 } 95 96 /** 97 * DOC: Locking: 98 * 99 * All writes e.g. Writes to device state (add/remove datapath, port, set 100 * operations on vports, etc.), Writes to other state (flow table 101 * modifications, set miscellaneous datapath parameters, etc.) are protected 102 * by ovs_lock. 103 * 104 * Reads are protected by RCU. 105 * 106 * There are a few special cases (mostly stats) that have their own 107 * synchronization but they nest under all of above and don't interact with 108 * each other. 109 * 110 * The RTNL lock nests inside ovs_mutex. 111 */ 112 113 static DEFINE_MUTEX(ovs_mutex); 114 115 void ovs_lock(void) 116 { 117 mutex_lock(&ovs_mutex); 118 } 119 120 void ovs_unlock(void) 121 { 122 mutex_unlock(&ovs_mutex); 123 } 124 125 #ifdef CONFIG_LOCKDEP 126 int lockdep_ovsl_is_held(void) 127 { 128 if (debug_locks) 129 return lockdep_is_held(&ovs_mutex); 130 else 131 return 1; 132 } 133 #endif 134 135 static struct vport *new_vport(const struct vport_parms *); 136 static int queue_gso_packets(struct datapath *dp, struct sk_buff *, 137 const struct dp_upcall_info *); 138 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *, 139 const struct dp_upcall_info *); 140 141 /* Must be called with rcu_read_lock or ovs_mutex. */ 142 static struct datapath *get_dp(struct net *net, int dp_ifindex) 143 { 144 struct datapath *dp = NULL; 145 struct net_device *dev; 146 147 rcu_read_lock(); 148 dev = dev_get_by_index_rcu(net, dp_ifindex); 149 if (dev) { 150 struct vport *vport = ovs_internal_dev_get_vport(dev); 151 if (vport) 152 dp = vport->dp; 153 } 154 rcu_read_unlock(); 155 156 return dp; 157 } 158 159 /* Must be called with rcu_read_lock or ovs_mutex. */ 160 const char *ovs_dp_name(const struct datapath *dp) 161 { 162 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); 163 return vport->ops->get_name(vport); 164 } 165 166 static int get_dpifindex(struct datapath *dp) 167 { 168 struct vport *local; 169 int ifindex; 170 171 rcu_read_lock(); 172 173 local = ovs_vport_rcu(dp, OVSP_LOCAL); 174 if (local) 175 ifindex = netdev_vport_priv(local)->dev->ifindex; 176 else 177 ifindex = 0; 178 179 rcu_read_unlock(); 180 181 return ifindex; 182 } 183 184 static void destroy_dp_rcu(struct rcu_head *rcu) 185 { 186 struct datapath *dp = container_of(rcu, struct datapath, rcu); 187 188 free_percpu(dp->stats_percpu); 189 release_net(ovs_dp_get_net(dp)); 190 kfree(dp->ports); 191 kfree(dp); 192 } 193 194 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 195 u16 port_no) 196 { 197 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 198 } 199 200 /* Called with ovs_mutex or RCU read lock. */ 201 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 202 { 203 struct vport *vport; 204 struct hlist_head *head; 205 206 head = vport_hash_bucket(dp, port_no); 207 hlist_for_each_entry_rcu(vport, head, dp_hash_node) { 208 if (vport->port_no == port_no) 209 return vport; 210 } 211 return NULL; 212 } 213 214 /* Called with ovs_mutex. */ 215 static struct vport *new_vport(const struct vport_parms *parms) 216 { 217 struct vport *vport; 218 219 vport = ovs_vport_add(parms); 220 if (!IS_ERR(vport)) { 221 struct datapath *dp = parms->dp; 222 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 223 224 hlist_add_head_rcu(&vport->dp_hash_node, head); 225 } 226 return vport; 227 } 228 229 void ovs_dp_detach_port(struct vport *p) 230 { 231 ASSERT_OVSL(); 232 233 /* First drop references to device. */ 234 hlist_del_rcu(&p->dp_hash_node); 235 236 /* Then destroy it. */ 237 ovs_vport_del(p); 238 } 239 240 /* Must be called with rcu_read_lock. */ 241 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key) 242 { 243 const struct vport *p = OVS_CB(skb)->input_vport; 244 struct datapath *dp = p->dp; 245 struct sw_flow *flow; 246 struct dp_stats_percpu *stats; 247 u64 *stats_counter; 248 u32 n_mask_hit; 249 250 stats = this_cpu_ptr(dp->stats_percpu); 251 252 /* Look up flow. */ 253 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit); 254 if (unlikely(!flow)) { 255 struct dp_upcall_info upcall; 256 int error; 257 258 upcall.cmd = OVS_PACKET_CMD_MISS; 259 upcall.key = key; 260 upcall.userdata = NULL; 261 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 262 error = ovs_dp_upcall(dp, skb, &upcall); 263 if (unlikely(error)) 264 kfree_skb(skb); 265 else 266 consume_skb(skb); 267 stats_counter = &stats->n_missed; 268 goto out; 269 } 270 271 OVS_CB(skb)->flow = flow; 272 273 ovs_flow_stats_update(OVS_CB(skb)->flow, key->tp.flags, skb); 274 ovs_execute_actions(dp, skb, key); 275 stats_counter = &stats->n_hit; 276 277 out: 278 /* Update datapath statistics. */ 279 u64_stats_update_begin(&stats->syncp); 280 (*stats_counter)++; 281 stats->n_mask_hit += n_mask_hit; 282 u64_stats_update_end(&stats->syncp); 283 } 284 285 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 286 const struct dp_upcall_info *upcall_info) 287 { 288 struct dp_stats_percpu *stats; 289 int err; 290 291 if (upcall_info->portid == 0) { 292 err = -ENOTCONN; 293 goto err; 294 } 295 296 if (!skb_is_gso(skb)) 297 err = queue_userspace_packet(dp, skb, upcall_info); 298 else 299 err = queue_gso_packets(dp, skb, upcall_info); 300 if (err) 301 goto err; 302 303 return 0; 304 305 err: 306 stats = this_cpu_ptr(dp->stats_percpu); 307 308 u64_stats_update_begin(&stats->syncp); 309 stats->n_lost++; 310 u64_stats_update_end(&stats->syncp); 311 312 return err; 313 } 314 315 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 316 const struct dp_upcall_info *upcall_info) 317 { 318 unsigned short gso_type = skb_shinfo(skb)->gso_type; 319 struct dp_upcall_info later_info; 320 struct sw_flow_key later_key; 321 struct sk_buff *segs, *nskb; 322 int err; 323 324 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 325 if (IS_ERR(segs)) 326 return PTR_ERR(segs); 327 if (segs == NULL) 328 return -EINVAL; 329 330 /* Queue all of the segments. */ 331 skb = segs; 332 do { 333 err = queue_userspace_packet(dp, skb, upcall_info); 334 if (err) 335 break; 336 337 if (skb == segs && gso_type & SKB_GSO_UDP) { 338 /* The initial flow key extracted by ovs_flow_extract() 339 * in this case is for a first fragment, so we need to 340 * properly mark later fragments. 341 */ 342 later_key = *upcall_info->key; 343 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 344 345 later_info = *upcall_info; 346 later_info.key = &later_key; 347 upcall_info = &later_info; 348 } 349 } while ((skb = skb->next)); 350 351 /* Free all of the segments. */ 352 skb = segs; 353 do { 354 nskb = skb->next; 355 if (err) 356 kfree_skb(skb); 357 else 358 consume_skb(skb); 359 } while ((skb = nskb)); 360 return err; 361 } 362 363 static size_t key_attr_size(void) 364 { 365 return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */ 366 + nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */ 367 + nla_total_size(8) /* OVS_TUNNEL_KEY_ATTR_ID */ 368 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */ 369 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */ 370 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TOS */ 371 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TTL */ 372 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */ 373 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_CSUM */ 374 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_OAM */ 375 + nla_total_size(256) /* OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS */ 376 + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */ 377 + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */ 378 + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */ 379 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */ 380 + nla_total_size(4) /* OVS_KEY_ATTR_8021Q */ 381 + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */ 382 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */ 383 + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */ 384 + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */ 385 + nla_total_size(28); /* OVS_KEY_ATTR_ND */ 386 } 387 388 static size_t upcall_msg_size(const struct nlattr *userdata, 389 unsigned int hdrlen) 390 { 391 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 392 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 393 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */ 394 395 /* OVS_PACKET_ATTR_USERDATA */ 396 if (userdata) 397 size += NLA_ALIGN(userdata->nla_len); 398 399 return size; 400 } 401 402 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 403 const struct dp_upcall_info *upcall_info) 404 { 405 struct ovs_header *upcall; 406 struct sk_buff *nskb = NULL; 407 struct sk_buff *user_skb = NULL; /* to be queued to userspace */ 408 struct nlattr *nla; 409 struct genl_info info = { 410 .dst_sk = ovs_dp_get_net(dp)->genl_sock, 411 .snd_portid = upcall_info->portid, 412 }; 413 size_t len; 414 unsigned int hlen; 415 int err, dp_ifindex; 416 417 dp_ifindex = get_dpifindex(dp); 418 if (!dp_ifindex) 419 return -ENODEV; 420 421 if (vlan_tx_tag_present(skb)) { 422 nskb = skb_clone(skb, GFP_ATOMIC); 423 if (!nskb) 424 return -ENOMEM; 425 426 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb)); 427 if (!nskb) 428 return -ENOMEM; 429 430 nskb->vlan_tci = 0; 431 skb = nskb; 432 } 433 434 if (nla_attr_size(skb->len) > USHRT_MAX) { 435 err = -EFBIG; 436 goto out; 437 } 438 439 /* Complete checksum if needed */ 440 if (skb->ip_summed == CHECKSUM_PARTIAL && 441 (err = skb_checksum_help(skb))) 442 goto out; 443 444 /* Older versions of OVS user space enforce alignment of the last 445 * Netlink attribute to NLA_ALIGNTO which would require extensive 446 * padding logic. Only perform zerocopy if padding is not required. 447 */ 448 if (dp->user_features & OVS_DP_F_UNALIGNED) 449 hlen = skb_zerocopy_headlen(skb); 450 else 451 hlen = skb->len; 452 453 len = upcall_msg_size(upcall_info->userdata, hlen); 454 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC); 455 if (!user_skb) { 456 err = -ENOMEM; 457 goto out; 458 } 459 460 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 461 0, upcall_info->cmd); 462 upcall->dp_ifindex = dp_ifindex; 463 464 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY); 465 err = ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb); 466 BUG_ON(err); 467 nla_nest_end(user_skb, nla); 468 469 if (upcall_info->userdata) 470 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 471 nla_len(upcall_info->userdata), 472 nla_data(upcall_info->userdata)); 473 474 /* Only reserve room for attribute header, packet data is added 475 * in skb_zerocopy() */ 476 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 477 err = -ENOBUFS; 478 goto out; 479 } 480 nla->nla_len = nla_attr_size(skb->len); 481 482 err = skb_zerocopy(user_skb, skb, skb->len, hlen); 483 if (err) 484 goto out; 485 486 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 487 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 488 size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len; 489 490 if (plen > 0) 491 memset(skb_put(user_skb, plen), 0, plen); 492 } 493 494 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 495 496 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 497 user_skb = NULL; 498 out: 499 if (err) 500 skb_tx_error(skb); 501 kfree_skb(user_skb); 502 kfree_skb(nskb); 503 return err; 504 } 505 506 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 507 { 508 struct ovs_header *ovs_header = info->userhdr; 509 struct nlattr **a = info->attrs; 510 struct sw_flow_actions *acts; 511 struct sk_buff *packet; 512 struct sw_flow *flow; 513 struct datapath *dp; 514 struct ethhdr *eth; 515 struct vport *input_vport; 516 int len; 517 int err; 518 519 err = -EINVAL; 520 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 521 !a[OVS_PACKET_ATTR_ACTIONS]) 522 goto err; 523 524 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 525 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 526 err = -ENOMEM; 527 if (!packet) 528 goto err; 529 skb_reserve(packet, NET_IP_ALIGN); 530 531 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 532 533 skb_reset_mac_header(packet); 534 eth = eth_hdr(packet); 535 536 /* Normally, setting the skb 'protocol' field would be handled by a 537 * call to eth_type_trans(), but it assumes there's a sending 538 * device, which we may not have. */ 539 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) 540 packet->protocol = eth->h_proto; 541 else 542 packet->protocol = htons(ETH_P_802_2); 543 544 /* Build an sw_flow for sending this packet. */ 545 flow = ovs_flow_alloc(); 546 err = PTR_ERR(flow); 547 if (IS_ERR(flow)) 548 goto err_kfree_skb; 549 550 err = ovs_flow_key_extract_userspace(a[OVS_PACKET_ATTR_KEY], packet, 551 &flow->key); 552 if (err) 553 goto err_flow_free; 554 555 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS])); 556 err = PTR_ERR(acts); 557 if (IS_ERR(acts)) 558 goto err_flow_free; 559 560 err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS], 561 &flow->key, 0, &acts); 562 if (err) 563 goto err_flow_free; 564 565 rcu_assign_pointer(flow->sf_acts, acts); 566 567 OVS_CB(packet)->egress_tun_info = NULL; 568 OVS_CB(packet)->flow = flow; 569 packet->priority = flow->key.phy.priority; 570 packet->mark = flow->key.phy.skb_mark; 571 572 rcu_read_lock(); 573 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 574 err = -ENODEV; 575 if (!dp) 576 goto err_unlock; 577 578 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 579 if (!input_vport) 580 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 581 582 if (!input_vport) 583 goto err_unlock; 584 585 OVS_CB(packet)->input_vport = input_vport; 586 587 local_bh_disable(); 588 err = ovs_execute_actions(dp, packet, &flow->key); 589 local_bh_enable(); 590 rcu_read_unlock(); 591 592 ovs_flow_free(flow, false); 593 return err; 594 595 err_unlock: 596 rcu_read_unlock(); 597 err_flow_free: 598 ovs_flow_free(flow, false); 599 err_kfree_skb: 600 kfree_skb(packet); 601 err: 602 return err; 603 } 604 605 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 606 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 607 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 608 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 609 }; 610 611 static const struct genl_ops dp_packet_genl_ops[] = { 612 { .cmd = OVS_PACKET_CMD_EXECUTE, 613 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 614 .policy = packet_policy, 615 .doit = ovs_packet_cmd_execute 616 } 617 }; 618 619 static struct genl_family dp_packet_genl_family = { 620 .id = GENL_ID_GENERATE, 621 .hdrsize = sizeof(struct ovs_header), 622 .name = OVS_PACKET_FAMILY, 623 .version = OVS_PACKET_VERSION, 624 .maxattr = OVS_PACKET_ATTR_MAX, 625 .netnsok = true, 626 .parallel_ops = true, 627 .ops = dp_packet_genl_ops, 628 .n_ops = ARRAY_SIZE(dp_packet_genl_ops), 629 }; 630 631 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats, 632 struct ovs_dp_megaflow_stats *mega_stats) 633 { 634 int i; 635 636 memset(mega_stats, 0, sizeof(*mega_stats)); 637 638 stats->n_flows = ovs_flow_tbl_count(&dp->table); 639 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 640 641 stats->n_hit = stats->n_missed = stats->n_lost = 0; 642 643 for_each_possible_cpu(i) { 644 const struct dp_stats_percpu *percpu_stats; 645 struct dp_stats_percpu local_stats; 646 unsigned int start; 647 648 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 649 650 do { 651 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 652 local_stats = *percpu_stats; 653 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 654 655 stats->n_hit += local_stats.n_hit; 656 stats->n_missed += local_stats.n_missed; 657 stats->n_lost += local_stats.n_lost; 658 mega_stats->n_mask_hit += local_stats.n_mask_hit; 659 } 660 } 661 662 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts) 663 { 664 return NLMSG_ALIGN(sizeof(struct ovs_header)) 665 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */ 666 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */ 667 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 668 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 669 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */ 670 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */ 671 } 672 673 /* Called with ovs_mutex or RCU read lock. */ 674 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 675 struct sk_buff *skb, u32 portid, 676 u32 seq, u32 flags, u8 cmd) 677 { 678 const int skb_orig_len = skb->len; 679 struct nlattr *start; 680 struct ovs_flow_stats stats; 681 __be16 tcp_flags; 682 unsigned long used; 683 struct ovs_header *ovs_header; 684 struct nlattr *nla; 685 int err; 686 687 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd); 688 if (!ovs_header) 689 return -EMSGSIZE; 690 691 ovs_header->dp_ifindex = dp_ifindex; 692 693 /* Fill flow key. */ 694 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY); 695 if (!nla) 696 goto nla_put_failure; 697 698 err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb); 699 if (err) 700 goto error; 701 nla_nest_end(skb, nla); 702 703 nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK); 704 if (!nla) 705 goto nla_put_failure; 706 707 err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb); 708 if (err) 709 goto error; 710 711 nla_nest_end(skb, nla); 712 713 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 714 715 if (used && 716 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used))) 717 goto nla_put_failure; 718 719 if (stats.n_packets && 720 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats)) 721 goto nla_put_failure; 722 723 if ((u8)ntohs(tcp_flags) && 724 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 725 goto nla_put_failure; 726 727 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 728 * this is the first flow to be dumped into 'skb'. This is unusual for 729 * Netlink but individual action lists can be longer than 730 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 731 * The userspace caller can always fetch the actions separately if it 732 * really wants them. (Most userspace callers in fact don't care.) 733 * 734 * This can only fail for dump operations because the skb is always 735 * properly sized for single flows. 736 */ 737 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS); 738 if (start) { 739 const struct sw_flow_actions *sf_acts; 740 741 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 742 err = ovs_nla_put_actions(sf_acts->actions, 743 sf_acts->actions_len, skb); 744 745 if (!err) 746 nla_nest_end(skb, start); 747 else { 748 if (skb_orig_len) 749 goto error; 750 751 nla_nest_cancel(skb, start); 752 } 753 } else if (skb_orig_len) 754 goto nla_put_failure; 755 756 return genlmsg_end(skb, ovs_header); 757 758 nla_put_failure: 759 err = -EMSGSIZE; 760 error: 761 genlmsg_cancel(skb, ovs_header); 762 return err; 763 } 764 765 /* May not be called with RCU read lock. */ 766 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 767 struct genl_info *info, 768 bool always) 769 { 770 struct sk_buff *skb; 771 772 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 773 return NULL; 774 775 skb = genlmsg_new_unicast(ovs_flow_cmd_msg_size(acts), info, GFP_KERNEL); 776 if (!skb) 777 return ERR_PTR(-ENOMEM); 778 779 return skb; 780 } 781 782 /* Called with ovs_mutex. */ 783 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 784 int dp_ifindex, 785 struct genl_info *info, u8 cmd, 786 bool always) 787 { 788 struct sk_buff *skb; 789 int retval; 790 791 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), info, 792 always); 793 if (IS_ERR_OR_NULL(skb)) 794 return skb; 795 796 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 797 info->snd_portid, info->snd_seq, 0, 798 cmd); 799 BUG_ON(retval < 0); 800 return skb; 801 } 802 803 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 804 { 805 struct nlattr **a = info->attrs; 806 struct ovs_header *ovs_header = info->userhdr; 807 struct sw_flow *flow, *new_flow; 808 struct sw_flow_mask mask; 809 struct sk_buff *reply; 810 struct datapath *dp; 811 struct sw_flow_actions *acts; 812 struct sw_flow_match match; 813 int error; 814 815 /* Must have key and actions. */ 816 error = -EINVAL; 817 if (!a[OVS_FLOW_ATTR_KEY]) 818 goto error; 819 if (!a[OVS_FLOW_ATTR_ACTIONS]) 820 goto error; 821 822 /* Most of the time we need to allocate a new flow, do it before 823 * locking. 824 */ 825 new_flow = ovs_flow_alloc(); 826 if (IS_ERR(new_flow)) { 827 error = PTR_ERR(new_flow); 828 goto error; 829 } 830 831 /* Extract key. */ 832 ovs_match_init(&match, &new_flow->unmasked_key, &mask); 833 error = ovs_nla_get_match(&match, 834 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]); 835 if (error) 836 goto err_kfree_flow; 837 838 ovs_flow_mask_key(&new_flow->key, &new_flow->unmasked_key, &mask); 839 840 /* Validate actions. */ 841 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS])); 842 error = PTR_ERR(acts); 843 if (IS_ERR(acts)) 844 goto err_kfree_flow; 845 846 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &new_flow->key, 847 0, &acts); 848 if (error) { 849 OVS_NLERR("Flow actions may not be safe on all matching packets.\n"); 850 goto err_kfree_acts; 851 } 852 853 reply = ovs_flow_cmd_alloc_info(acts, info, false); 854 if (IS_ERR(reply)) { 855 error = PTR_ERR(reply); 856 goto err_kfree_acts; 857 } 858 859 ovs_lock(); 860 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 861 if (unlikely(!dp)) { 862 error = -ENODEV; 863 goto err_unlock_ovs; 864 } 865 /* Check if this is a duplicate flow */ 866 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->unmasked_key); 867 if (likely(!flow)) { 868 rcu_assign_pointer(new_flow->sf_acts, acts); 869 870 /* Put flow in bucket. */ 871 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 872 if (unlikely(error)) { 873 acts = NULL; 874 goto err_unlock_ovs; 875 } 876 877 if (unlikely(reply)) { 878 error = ovs_flow_cmd_fill_info(new_flow, 879 ovs_header->dp_ifindex, 880 reply, info->snd_portid, 881 info->snd_seq, 0, 882 OVS_FLOW_CMD_NEW); 883 BUG_ON(error < 0); 884 } 885 ovs_unlock(); 886 } else { 887 struct sw_flow_actions *old_acts; 888 889 /* Bail out if we're not allowed to modify an existing flow. 890 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 891 * because Generic Netlink treats the latter as a dump 892 * request. We also accept NLM_F_EXCL in case that bug ever 893 * gets fixed. 894 */ 895 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 896 | NLM_F_EXCL))) { 897 error = -EEXIST; 898 goto err_unlock_ovs; 899 } 900 /* The unmasked key has to be the same for flow updates. */ 901 if (unlikely(!ovs_flow_cmp_unmasked_key(flow, &match))) { 902 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 903 if (!flow) { 904 error = -ENOENT; 905 goto err_unlock_ovs; 906 } 907 } 908 /* Update actions. */ 909 old_acts = ovsl_dereference(flow->sf_acts); 910 rcu_assign_pointer(flow->sf_acts, acts); 911 912 if (unlikely(reply)) { 913 error = ovs_flow_cmd_fill_info(flow, 914 ovs_header->dp_ifindex, 915 reply, info->snd_portid, 916 info->snd_seq, 0, 917 OVS_FLOW_CMD_NEW); 918 BUG_ON(error < 0); 919 } 920 ovs_unlock(); 921 922 ovs_nla_free_flow_actions(old_acts); 923 ovs_flow_free(new_flow, false); 924 } 925 926 if (reply) 927 ovs_notify(&dp_flow_genl_family, reply, info); 928 return 0; 929 930 err_unlock_ovs: 931 ovs_unlock(); 932 kfree_skb(reply); 933 err_kfree_acts: 934 kfree(acts); 935 err_kfree_flow: 936 ovs_flow_free(new_flow, false); 937 error: 938 return error; 939 } 940 941 static struct sw_flow_actions *get_flow_actions(const struct nlattr *a, 942 const struct sw_flow_key *key, 943 const struct sw_flow_mask *mask) 944 { 945 struct sw_flow_actions *acts; 946 struct sw_flow_key masked_key; 947 int error; 948 949 acts = ovs_nla_alloc_flow_actions(nla_len(a)); 950 if (IS_ERR(acts)) 951 return acts; 952 953 ovs_flow_mask_key(&masked_key, key, mask); 954 error = ovs_nla_copy_actions(a, &masked_key, 0, &acts); 955 if (error) { 956 OVS_NLERR("Flow actions may not be safe on all matching packets.\n"); 957 kfree(acts); 958 return ERR_PTR(error); 959 } 960 961 return acts; 962 } 963 964 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 965 { 966 struct nlattr **a = info->attrs; 967 struct ovs_header *ovs_header = info->userhdr; 968 struct sw_flow_key key; 969 struct sw_flow *flow; 970 struct sw_flow_mask mask; 971 struct sk_buff *reply = NULL; 972 struct datapath *dp; 973 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 974 struct sw_flow_match match; 975 int error; 976 977 /* Extract key. */ 978 error = -EINVAL; 979 if (!a[OVS_FLOW_ATTR_KEY]) 980 goto error; 981 982 ovs_match_init(&match, &key, &mask); 983 error = ovs_nla_get_match(&match, 984 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]); 985 if (error) 986 goto error; 987 988 /* Validate actions. */ 989 if (a[OVS_FLOW_ATTR_ACTIONS]) { 990 acts = get_flow_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, &mask); 991 if (IS_ERR(acts)) { 992 error = PTR_ERR(acts); 993 goto error; 994 } 995 } 996 997 /* Can allocate before locking if have acts. */ 998 if (acts) { 999 reply = ovs_flow_cmd_alloc_info(acts, info, false); 1000 if (IS_ERR(reply)) { 1001 error = PTR_ERR(reply); 1002 goto err_kfree_acts; 1003 } 1004 } 1005 1006 ovs_lock(); 1007 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1008 if (unlikely(!dp)) { 1009 error = -ENODEV; 1010 goto err_unlock_ovs; 1011 } 1012 /* Check that the flow exists. */ 1013 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1014 if (unlikely(!flow)) { 1015 error = -ENOENT; 1016 goto err_unlock_ovs; 1017 } 1018 1019 /* Update actions, if present. */ 1020 if (likely(acts)) { 1021 old_acts = ovsl_dereference(flow->sf_acts); 1022 rcu_assign_pointer(flow->sf_acts, acts); 1023 1024 if (unlikely(reply)) { 1025 error = ovs_flow_cmd_fill_info(flow, 1026 ovs_header->dp_ifindex, 1027 reply, info->snd_portid, 1028 info->snd_seq, 0, 1029 OVS_FLOW_CMD_NEW); 1030 BUG_ON(error < 0); 1031 } 1032 } else { 1033 /* Could not alloc without acts before locking. */ 1034 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1035 info, OVS_FLOW_CMD_NEW, false); 1036 if (unlikely(IS_ERR(reply))) { 1037 error = PTR_ERR(reply); 1038 goto err_unlock_ovs; 1039 } 1040 } 1041 1042 /* Clear stats. */ 1043 if (a[OVS_FLOW_ATTR_CLEAR]) 1044 ovs_flow_stats_clear(flow); 1045 ovs_unlock(); 1046 1047 if (reply) 1048 ovs_notify(&dp_flow_genl_family, reply, info); 1049 if (old_acts) 1050 ovs_nla_free_flow_actions(old_acts); 1051 1052 return 0; 1053 1054 err_unlock_ovs: 1055 ovs_unlock(); 1056 kfree_skb(reply); 1057 err_kfree_acts: 1058 kfree(acts); 1059 error: 1060 return error; 1061 } 1062 1063 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1064 { 1065 struct nlattr **a = info->attrs; 1066 struct ovs_header *ovs_header = info->userhdr; 1067 struct sw_flow_key key; 1068 struct sk_buff *reply; 1069 struct sw_flow *flow; 1070 struct datapath *dp; 1071 struct sw_flow_match match; 1072 int err; 1073 1074 if (!a[OVS_FLOW_ATTR_KEY]) { 1075 OVS_NLERR("Flow get message rejected, Key attribute missing.\n"); 1076 return -EINVAL; 1077 } 1078 1079 ovs_match_init(&match, &key, NULL); 1080 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL); 1081 if (err) 1082 return err; 1083 1084 ovs_lock(); 1085 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1086 if (!dp) { 1087 err = -ENODEV; 1088 goto unlock; 1089 } 1090 1091 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1092 if (!flow) { 1093 err = -ENOENT; 1094 goto unlock; 1095 } 1096 1097 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1098 OVS_FLOW_CMD_NEW, true); 1099 if (IS_ERR(reply)) { 1100 err = PTR_ERR(reply); 1101 goto unlock; 1102 } 1103 1104 ovs_unlock(); 1105 return genlmsg_reply(reply, info); 1106 unlock: 1107 ovs_unlock(); 1108 return err; 1109 } 1110 1111 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1112 { 1113 struct nlattr **a = info->attrs; 1114 struct ovs_header *ovs_header = info->userhdr; 1115 struct sw_flow_key key; 1116 struct sk_buff *reply; 1117 struct sw_flow *flow; 1118 struct datapath *dp; 1119 struct sw_flow_match match; 1120 int err; 1121 1122 if (likely(a[OVS_FLOW_ATTR_KEY])) { 1123 ovs_match_init(&match, &key, NULL); 1124 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL); 1125 if (unlikely(err)) 1126 return err; 1127 } 1128 1129 ovs_lock(); 1130 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1131 if (unlikely(!dp)) { 1132 err = -ENODEV; 1133 goto unlock; 1134 } 1135 1136 if (unlikely(!a[OVS_FLOW_ATTR_KEY])) { 1137 err = ovs_flow_tbl_flush(&dp->table); 1138 goto unlock; 1139 } 1140 1141 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1142 if (unlikely(!flow)) { 1143 err = -ENOENT; 1144 goto unlock; 1145 } 1146 1147 ovs_flow_tbl_remove(&dp->table, flow); 1148 ovs_unlock(); 1149 1150 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1151 info, false); 1152 if (likely(reply)) { 1153 if (likely(!IS_ERR(reply))) { 1154 rcu_read_lock(); /*To keep RCU checker happy. */ 1155 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1156 reply, info->snd_portid, 1157 info->snd_seq, 0, 1158 OVS_FLOW_CMD_DEL); 1159 rcu_read_unlock(); 1160 BUG_ON(err < 0); 1161 1162 ovs_notify(&dp_flow_genl_family, reply, info); 1163 } else { 1164 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply)); 1165 } 1166 } 1167 1168 ovs_flow_free(flow, true); 1169 return 0; 1170 unlock: 1171 ovs_unlock(); 1172 return err; 1173 } 1174 1175 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1176 { 1177 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1178 struct table_instance *ti; 1179 struct datapath *dp; 1180 1181 rcu_read_lock(); 1182 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1183 if (!dp) { 1184 rcu_read_unlock(); 1185 return -ENODEV; 1186 } 1187 1188 ti = rcu_dereference(dp->table.ti); 1189 for (;;) { 1190 struct sw_flow *flow; 1191 u32 bucket, obj; 1192 1193 bucket = cb->args[0]; 1194 obj = cb->args[1]; 1195 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1196 if (!flow) 1197 break; 1198 1199 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1200 NETLINK_CB(cb->skb).portid, 1201 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1202 OVS_FLOW_CMD_NEW) < 0) 1203 break; 1204 1205 cb->args[0] = bucket; 1206 cb->args[1] = obj; 1207 } 1208 rcu_read_unlock(); 1209 return skb->len; 1210 } 1211 1212 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1213 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1214 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1215 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1216 }; 1217 1218 static const struct genl_ops dp_flow_genl_ops[] = { 1219 { .cmd = OVS_FLOW_CMD_NEW, 1220 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1221 .policy = flow_policy, 1222 .doit = ovs_flow_cmd_new 1223 }, 1224 { .cmd = OVS_FLOW_CMD_DEL, 1225 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1226 .policy = flow_policy, 1227 .doit = ovs_flow_cmd_del 1228 }, 1229 { .cmd = OVS_FLOW_CMD_GET, 1230 .flags = 0, /* OK for unprivileged users. */ 1231 .policy = flow_policy, 1232 .doit = ovs_flow_cmd_get, 1233 .dumpit = ovs_flow_cmd_dump 1234 }, 1235 { .cmd = OVS_FLOW_CMD_SET, 1236 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1237 .policy = flow_policy, 1238 .doit = ovs_flow_cmd_set, 1239 }, 1240 }; 1241 1242 static struct genl_family dp_flow_genl_family = { 1243 .id = GENL_ID_GENERATE, 1244 .hdrsize = sizeof(struct ovs_header), 1245 .name = OVS_FLOW_FAMILY, 1246 .version = OVS_FLOW_VERSION, 1247 .maxattr = OVS_FLOW_ATTR_MAX, 1248 .netnsok = true, 1249 .parallel_ops = true, 1250 .ops = dp_flow_genl_ops, 1251 .n_ops = ARRAY_SIZE(dp_flow_genl_ops), 1252 .mcgrps = &ovs_dp_flow_multicast_group, 1253 .n_mcgrps = 1, 1254 }; 1255 1256 static size_t ovs_dp_cmd_msg_size(void) 1257 { 1258 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1259 1260 msgsize += nla_total_size(IFNAMSIZ); 1261 msgsize += nla_total_size(sizeof(struct ovs_dp_stats)); 1262 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats)); 1263 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1264 1265 return msgsize; 1266 } 1267 1268 /* Called with ovs_mutex or RCU read lock. */ 1269 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1270 u32 portid, u32 seq, u32 flags, u8 cmd) 1271 { 1272 struct ovs_header *ovs_header; 1273 struct ovs_dp_stats dp_stats; 1274 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1275 int err; 1276 1277 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1278 flags, cmd); 1279 if (!ovs_header) 1280 goto error; 1281 1282 ovs_header->dp_ifindex = get_dpifindex(dp); 1283 1284 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1285 if (err) 1286 goto nla_put_failure; 1287 1288 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1289 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1290 &dp_stats)) 1291 goto nla_put_failure; 1292 1293 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1294 sizeof(struct ovs_dp_megaflow_stats), 1295 &dp_megaflow_stats)) 1296 goto nla_put_failure; 1297 1298 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1299 goto nla_put_failure; 1300 1301 return genlmsg_end(skb, ovs_header); 1302 1303 nla_put_failure: 1304 genlmsg_cancel(skb, ovs_header); 1305 error: 1306 return -EMSGSIZE; 1307 } 1308 1309 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info) 1310 { 1311 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL); 1312 } 1313 1314 /* Called with rcu_read_lock or ovs_mutex. */ 1315 static struct datapath *lookup_datapath(struct net *net, 1316 struct ovs_header *ovs_header, 1317 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1318 { 1319 struct datapath *dp; 1320 1321 if (!a[OVS_DP_ATTR_NAME]) 1322 dp = get_dp(net, ovs_header->dp_ifindex); 1323 else { 1324 struct vport *vport; 1325 1326 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1327 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1328 } 1329 return dp ? dp : ERR_PTR(-ENODEV); 1330 } 1331 1332 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info) 1333 { 1334 struct datapath *dp; 1335 1336 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1337 if (IS_ERR(dp)) 1338 return; 1339 1340 WARN(dp->user_features, "Dropping previously announced user features\n"); 1341 dp->user_features = 0; 1342 } 1343 1344 static void ovs_dp_change(struct datapath *dp, struct nlattr **a) 1345 { 1346 if (a[OVS_DP_ATTR_USER_FEATURES]) 1347 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1348 } 1349 1350 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1351 { 1352 struct nlattr **a = info->attrs; 1353 struct vport_parms parms; 1354 struct sk_buff *reply; 1355 struct datapath *dp; 1356 struct vport *vport; 1357 struct ovs_net *ovs_net; 1358 int err, i; 1359 1360 err = -EINVAL; 1361 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1362 goto err; 1363 1364 reply = ovs_dp_cmd_alloc_info(info); 1365 if (!reply) 1366 return -ENOMEM; 1367 1368 err = -ENOMEM; 1369 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1370 if (dp == NULL) 1371 goto err_free_reply; 1372 1373 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk))); 1374 1375 /* Allocate table. */ 1376 err = ovs_flow_tbl_init(&dp->table); 1377 if (err) 1378 goto err_free_dp; 1379 1380 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1381 if (!dp->stats_percpu) { 1382 err = -ENOMEM; 1383 goto err_destroy_table; 1384 } 1385 1386 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head), 1387 GFP_KERNEL); 1388 if (!dp->ports) { 1389 err = -ENOMEM; 1390 goto err_destroy_percpu; 1391 } 1392 1393 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1394 INIT_HLIST_HEAD(&dp->ports[i]); 1395 1396 /* Set up our datapath device. */ 1397 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1398 parms.type = OVS_VPORT_TYPE_INTERNAL; 1399 parms.options = NULL; 1400 parms.dp = dp; 1401 parms.port_no = OVSP_LOCAL; 1402 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1403 1404 ovs_dp_change(dp, a); 1405 1406 /* So far only local changes have been made, now need the lock. */ 1407 ovs_lock(); 1408 1409 vport = new_vport(&parms); 1410 if (IS_ERR(vport)) { 1411 err = PTR_ERR(vport); 1412 if (err == -EBUSY) 1413 err = -EEXIST; 1414 1415 if (err == -EEXIST) { 1416 /* An outdated user space instance that does not understand 1417 * the concept of user_features has attempted to create a new 1418 * datapath and is likely to reuse it. Drop all user features. 1419 */ 1420 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1421 ovs_dp_reset_user_features(skb, info); 1422 } 1423 1424 goto err_destroy_ports_array; 1425 } 1426 1427 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1428 info->snd_seq, 0, OVS_DP_CMD_NEW); 1429 BUG_ON(err < 0); 1430 1431 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1432 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1433 1434 ovs_unlock(); 1435 1436 ovs_notify(&dp_datapath_genl_family, reply, info); 1437 return 0; 1438 1439 err_destroy_ports_array: 1440 ovs_unlock(); 1441 kfree(dp->ports); 1442 err_destroy_percpu: 1443 free_percpu(dp->stats_percpu); 1444 err_destroy_table: 1445 ovs_flow_tbl_destroy(&dp->table, false); 1446 err_free_dp: 1447 release_net(ovs_dp_get_net(dp)); 1448 kfree(dp); 1449 err_free_reply: 1450 kfree_skb(reply); 1451 err: 1452 return err; 1453 } 1454 1455 /* Called with ovs_mutex. */ 1456 static void __dp_destroy(struct datapath *dp) 1457 { 1458 int i; 1459 1460 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1461 struct vport *vport; 1462 struct hlist_node *n; 1463 1464 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1465 if (vport->port_no != OVSP_LOCAL) 1466 ovs_dp_detach_port(vport); 1467 } 1468 1469 list_del_rcu(&dp->list_node); 1470 1471 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1472 * all ports in datapath are destroyed first before freeing datapath. 1473 */ 1474 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1475 1476 /* RCU destroy the flow table */ 1477 ovs_flow_tbl_destroy(&dp->table, true); 1478 1479 call_rcu(&dp->rcu, destroy_dp_rcu); 1480 } 1481 1482 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1483 { 1484 struct sk_buff *reply; 1485 struct datapath *dp; 1486 int err; 1487 1488 reply = ovs_dp_cmd_alloc_info(info); 1489 if (!reply) 1490 return -ENOMEM; 1491 1492 ovs_lock(); 1493 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1494 err = PTR_ERR(dp); 1495 if (IS_ERR(dp)) 1496 goto err_unlock_free; 1497 1498 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1499 info->snd_seq, 0, OVS_DP_CMD_DEL); 1500 BUG_ON(err < 0); 1501 1502 __dp_destroy(dp); 1503 ovs_unlock(); 1504 1505 ovs_notify(&dp_datapath_genl_family, reply, info); 1506 1507 return 0; 1508 1509 err_unlock_free: 1510 ovs_unlock(); 1511 kfree_skb(reply); 1512 return err; 1513 } 1514 1515 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1516 { 1517 struct sk_buff *reply; 1518 struct datapath *dp; 1519 int err; 1520 1521 reply = ovs_dp_cmd_alloc_info(info); 1522 if (!reply) 1523 return -ENOMEM; 1524 1525 ovs_lock(); 1526 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1527 err = PTR_ERR(dp); 1528 if (IS_ERR(dp)) 1529 goto err_unlock_free; 1530 1531 ovs_dp_change(dp, info->attrs); 1532 1533 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1534 info->snd_seq, 0, OVS_DP_CMD_NEW); 1535 BUG_ON(err < 0); 1536 1537 ovs_unlock(); 1538 ovs_notify(&dp_datapath_genl_family, reply, info); 1539 1540 return 0; 1541 1542 err_unlock_free: 1543 ovs_unlock(); 1544 kfree_skb(reply); 1545 return err; 1546 } 1547 1548 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1549 { 1550 struct sk_buff *reply; 1551 struct datapath *dp; 1552 int err; 1553 1554 reply = ovs_dp_cmd_alloc_info(info); 1555 if (!reply) 1556 return -ENOMEM; 1557 1558 rcu_read_lock(); 1559 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1560 if (IS_ERR(dp)) { 1561 err = PTR_ERR(dp); 1562 goto err_unlock_free; 1563 } 1564 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1565 info->snd_seq, 0, OVS_DP_CMD_NEW); 1566 BUG_ON(err < 0); 1567 rcu_read_unlock(); 1568 1569 return genlmsg_reply(reply, info); 1570 1571 err_unlock_free: 1572 rcu_read_unlock(); 1573 kfree_skb(reply); 1574 return err; 1575 } 1576 1577 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1578 { 1579 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1580 struct datapath *dp; 1581 int skip = cb->args[0]; 1582 int i = 0; 1583 1584 rcu_read_lock(); 1585 list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) { 1586 if (i >= skip && 1587 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1588 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1589 OVS_DP_CMD_NEW) < 0) 1590 break; 1591 i++; 1592 } 1593 rcu_read_unlock(); 1594 1595 cb->args[0] = i; 1596 1597 return skb->len; 1598 } 1599 1600 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1601 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1602 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1603 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1604 }; 1605 1606 static const struct genl_ops dp_datapath_genl_ops[] = { 1607 { .cmd = OVS_DP_CMD_NEW, 1608 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1609 .policy = datapath_policy, 1610 .doit = ovs_dp_cmd_new 1611 }, 1612 { .cmd = OVS_DP_CMD_DEL, 1613 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1614 .policy = datapath_policy, 1615 .doit = ovs_dp_cmd_del 1616 }, 1617 { .cmd = OVS_DP_CMD_GET, 1618 .flags = 0, /* OK for unprivileged users. */ 1619 .policy = datapath_policy, 1620 .doit = ovs_dp_cmd_get, 1621 .dumpit = ovs_dp_cmd_dump 1622 }, 1623 { .cmd = OVS_DP_CMD_SET, 1624 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1625 .policy = datapath_policy, 1626 .doit = ovs_dp_cmd_set, 1627 }, 1628 }; 1629 1630 static struct genl_family dp_datapath_genl_family = { 1631 .id = GENL_ID_GENERATE, 1632 .hdrsize = sizeof(struct ovs_header), 1633 .name = OVS_DATAPATH_FAMILY, 1634 .version = OVS_DATAPATH_VERSION, 1635 .maxattr = OVS_DP_ATTR_MAX, 1636 .netnsok = true, 1637 .parallel_ops = true, 1638 .ops = dp_datapath_genl_ops, 1639 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops), 1640 .mcgrps = &ovs_dp_datapath_multicast_group, 1641 .n_mcgrps = 1, 1642 }; 1643 1644 /* Called with ovs_mutex or RCU read lock. */ 1645 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1646 u32 portid, u32 seq, u32 flags, u8 cmd) 1647 { 1648 struct ovs_header *ovs_header; 1649 struct ovs_vport_stats vport_stats; 1650 int err; 1651 1652 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1653 flags, cmd); 1654 if (!ovs_header) 1655 return -EMSGSIZE; 1656 1657 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1658 1659 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1660 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1661 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 1662 vport->ops->get_name(vport))) 1663 goto nla_put_failure; 1664 1665 ovs_vport_get_stats(vport, &vport_stats); 1666 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), 1667 &vport_stats)) 1668 goto nla_put_failure; 1669 1670 if (ovs_vport_get_upcall_portids(vport, skb)) 1671 goto nla_put_failure; 1672 1673 err = ovs_vport_get_options(vport, skb); 1674 if (err == -EMSGSIZE) 1675 goto error; 1676 1677 return genlmsg_end(skb, ovs_header); 1678 1679 nla_put_failure: 1680 err = -EMSGSIZE; 1681 error: 1682 genlmsg_cancel(skb, ovs_header); 1683 return err; 1684 } 1685 1686 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 1687 { 1688 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1689 } 1690 1691 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 1692 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid, 1693 u32 seq, u8 cmd) 1694 { 1695 struct sk_buff *skb; 1696 int retval; 1697 1698 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1699 if (!skb) 1700 return ERR_PTR(-ENOMEM); 1701 1702 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd); 1703 BUG_ON(retval < 0); 1704 1705 return skb; 1706 } 1707 1708 /* Called with ovs_mutex or RCU read lock. */ 1709 static struct vport *lookup_vport(struct net *net, 1710 struct ovs_header *ovs_header, 1711 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1712 { 1713 struct datapath *dp; 1714 struct vport *vport; 1715 1716 if (a[OVS_VPORT_ATTR_NAME]) { 1717 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 1718 if (!vport) 1719 return ERR_PTR(-ENODEV); 1720 if (ovs_header->dp_ifindex && 1721 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 1722 return ERR_PTR(-ENODEV); 1723 return vport; 1724 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 1725 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1726 1727 if (port_no >= DP_MAX_PORTS) 1728 return ERR_PTR(-EFBIG); 1729 1730 dp = get_dp(net, ovs_header->dp_ifindex); 1731 if (!dp) 1732 return ERR_PTR(-ENODEV); 1733 1734 vport = ovs_vport_ovsl_rcu(dp, port_no); 1735 if (!vport) 1736 return ERR_PTR(-ENODEV); 1737 return vport; 1738 } else 1739 return ERR_PTR(-EINVAL); 1740 } 1741 1742 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 1743 { 1744 struct nlattr **a = info->attrs; 1745 struct ovs_header *ovs_header = info->userhdr; 1746 struct vport_parms parms; 1747 struct sk_buff *reply; 1748 struct vport *vport; 1749 struct datapath *dp; 1750 u32 port_no; 1751 int err; 1752 1753 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 1754 !a[OVS_VPORT_ATTR_UPCALL_PID]) 1755 return -EINVAL; 1756 1757 port_no = a[OVS_VPORT_ATTR_PORT_NO] 1758 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 1759 if (port_no >= DP_MAX_PORTS) 1760 return -EFBIG; 1761 1762 reply = ovs_vport_cmd_alloc_info(); 1763 if (!reply) 1764 return -ENOMEM; 1765 1766 ovs_lock(); 1767 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1768 err = -ENODEV; 1769 if (!dp) 1770 goto exit_unlock_free; 1771 1772 if (port_no) { 1773 vport = ovs_vport_ovsl(dp, port_no); 1774 err = -EBUSY; 1775 if (vport) 1776 goto exit_unlock_free; 1777 } else { 1778 for (port_no = 1; ; port_no++) { 1779 if (port_no >= DP_MAX_PORTS) { 1780 err = -EFBIG; 1781 goto exit_unlock_free; 1782 } 1783 vport = ovs_vport_ovsl(dp, port_no); 1784 if (!vport) 1785 break; 1786 } 1787 } 1788 1789 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 1790 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 1791 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 1792 parms.dp = dp; 1793 parms.port_no = port_no; 1794 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 1795 1796 vport = new_vport(&parms); 1797 err = PTR_ERR(vport); 1798 if (IS_ERR(vport)) 1799 goto exit_unlock_free; 1800 1801 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 1802 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 1803 BUG_ON(err < 0); 1804 ovs_unlock(); 1805 1806 ovs_notify(&dp_vport_genl_family, reply, info); 1807 return 0; 1808 1809 exit_unlock_free: 1810 ovs_unlock(); 1811 kfree_skb(reply); 1812 return err; 1813 } 1814 1815 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 1816 { 1817 struct nlattr **a = info->attrs; 1818 struct sk_buff *reply; 1819 struct vport *vport; 1820 int err; 1821 1822 reply = ovs_vport_cmd_alloc_info(); 1823 if (!reply) 1824 return -ENOMEM; 1825 1826 ovs_lock(); 1827 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1828 err = PTR_ERR(vport); 1829 if (IS_ERR(vport)) 1830 goto exit_unlock_free; 1831 1832 if (a[OVS_VPORT_ATTR_TYPE] && 1833 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 1834 err = -EINVAL; 1835 goto exit_unlock_free; 1836 } 1837 1838 if (a[OVS_VPORT_ATTR_OPTIONS]) { 1839 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 1840 if (err) 1841 goto exit_unlock_free; 1842 } 1843 1844 1845 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 1846 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 1847 1848 err = ovs_vport_set_upcall_portids(vport, ids); 1849 if (err) 1850 goto exit_unlock_free; 1851 } 1852 1853 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 1854 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 1855 BUG_ON(err < 0); 1856 1857 ovs_unlock(); 1858 ovs_notify(&dp_vport_genl_family, reply, info); 1859 return 0; 1860 1861 exit_unlock_free: 1862 ovs_unlock(); 1863 kfree_skb(reply); 1864 return err; 1865 } 1866 1867 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 1868 { 1869 struct nlattr **a = info->attrs; 1870 struct sk_buff *reply; 1871 struct vport *vport; 1872 int err; 1873 1874 reply = ovs_vport_cmd_alloc_info(); 1875 if (!reply) 1876 return -ENOMEM; 1877 1878 ovs_lock(); 1879 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1880 err = PTR_ERR(vport); 1881 if (IS_ERR(vport)) 1882 goto exit_unlock_free; 1883 1884 if (vport->port_no == OVSP_LOCAL) { 1885 err = -EINVAL; 1886 goto exit_unlock_free; 1887 } 1888 1889 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 1890 info->snd_seq, 0, OVS_VPORT_CMD_DEL); 1891 BUG_ON(err < 0); 1892 ovs_dp_detach_port(vport); 1893 ovs_unlock(); 1894 1895 ovs_notify(&dp_vport_genl_family, reply, info); 1896 return 0; 1897 1898 exit_unlock_free: 1899 ovs_unlock(); 1900 kfree_skb(reply); 1901 return err; 1902 } 1903 1904 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 1905 { 1906 struct nlattr **a = info->attrs; 1907 struct ovs_header *ovs_header = info->userhdr; 1908 struct sk_buff *reply; 1909 struct vport *vport; 1910 int err; 1911 1912 reply = ovs_vport_cmd_alloc_info(); 1913 if (!reply) 1914 return -ENOMEM; 1915 1916 rcu_read_lock(); 1917 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 1918 err = PTR_ERR(vport); 1919 if (IS_ERR(vport)) 1920 goto exit_unlock_free; 1921 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 1922 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 1923 BUG_ON(err < 0); 1924 rcu_read_unlock(); 1925 1926 return genlmsg_reply(reply, info); 1927 1928 exit_unlock_free: 1929 rcu_read_unlock(); 1930 kfree_skb(reply); 1931 return err; 1932 } 1933 1934 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1935 { 1936 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1937 struct datapath *dp; 1938 int bucket = cb->args[0], skip = cb->args[1]; 1939 int i, j = 0; 1940 1941 rcu_read_lock(); 1942 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1943 if (!dp) { 1944 rcu_read_unlock(); 1945 return -ENODEV; 1946 } 1947 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 1948 struct vport *vport; 1949 1950 j = 0; 1951 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 1952 if (j >= skip && 1953 ovs_vport_cmd_fill_info(vport, skb, 1954 NETLINK_CB(cb->skb).portid, 1955 cb->nlh->nlmsg_seq, 1956 NLM_F_MULTI, 1957 OVS_VPORT_CMD_NEW) < 0) 1958 goto out; 1959 1960 j++; 1961 } 1962 skip = 0; 1963 } 1964 out: 1965 rcu_read_unlock(); 1966 1967 cb->args[0] = i; 1968 cb->args[1] = j; 1969 1970 return skb->len; 1971 } 1972 1973 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 1974 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1975 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 1976 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 1977 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 1978 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1979 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 1980 }; 1981 1982 static const struct genl_ops dp_vport_genl_ops[] = { 1983 { .cmd = OVS_VPORT_CMD_NEW, 1984 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1985 .policy = vport_policy, 1986 .doit = ovs_vport_cmd_new 1987 }, 1988 { .cmd = OVS_VPORT_CMD_DEL, 1989 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1990 .policy = vport_policy, 1991 .doit = ovs_vport_cmd_del 1992 }, 1993 { .cmd = OVS_VPORT_CMD_GET, 1994 .flags = 0, /* OK for unprivileged users. */ 1995 .policy = vport_policy, 1996 .doit = ovs_vport_cmd_get, 1997 .dumpit = ovs_vport_cmd_dump 1998 }, 1999 { .cmd = OVS_VPORT_CMD_SET, 2000 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2001 .policy = vport_policy, 2002 .doit = ovs_vport_cmd_set, 2003 }, 2004 }; 2005 2006 struct genl_family dp_vport_genl_family = { 2007 .id = GENL_ID_GENERATE, 2008 .hdrsize = sizeof(struct ovs_header), 2009 .name = OVS_VPORT_FAMILY, 2010 .version = OVS_VPORT_VERSION, 2011 .maxattr = OVS_VPORT_ATTR_MAX, 2012 .netnsok = true, 2013 .parallel_ops = true, 2014 .ops = dp_vport_genl_ops, 2015 .n_ops = ARRAY_SIZE(dp_vport_genl_ops), 2016 .mcgrps = &ovs_dp_vport_multicast_group, 2017 .n_mcgrps = 1, 2018 }; 2019 2020 static struct genl_family * const dp_genl_families[] = { 2021 &dp_datapath_genl_family, 2022 &dp_vport_genl_family, 2023 &dp_flow_genl_family, 2024 &dp_packet_genl_family, 2025 }; 2026 2027 static void dp_unregister_genl(int n_families) 2028 { 2029 int i; 2030 2031 for (i = 0; i < n_families; i++) 2032 genl_unregister_family(dp_genl_families[i]); 2033 } 2034 2035 static int dp_register_genl(void) 2036 { 2037 int err; 2038 int i; 2039 2040 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2041 2042 err = genl_register_family(dp_genl_families[i]); 2043 if (err) 2044 goto error; 2045 } 2046 2047 return 0; 2048 2049 error: 2050 dp_unregister_genl(i); 2051 return err; 2052 } 2053 2054 static int __net_init ovs_init_net(struct net *net) 2055 { 2056 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2057 2058 INIT_LIST_HEAD(&ovs_net->dps); 2059 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2060 return 0; 2061 } 2062 2063 static void __net_exit ovs_exit_net(struct net *net) 2064 { 2065 struct datapath *dp, *dp_next; 2066 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2067 2068 ovs_lock(); 2069 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2070 __dp_destroy(dp); 2071 ovs_unlock(); 2072 2073 cancel_work_sync(&ovs_net->dp_notify_work); 2074 } 2075 2076 static struct pernet_operations ovs_net_ops = { 2077 .init = ovs_init_net, 2078 .exit = ovs_exit_net, 2079 .id = &ovs_net_id, 2080 .size = sizeof(struct ovs_net), 2081 }; 2082 2083 static int __init dp_init(void) 2084 { 2085 int err; 2086 2087 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); 2088 2089 pr_info("Open vSwitch switching datapath\n"); 2090 2091 err = action_fifos_init(); 2092 if (err) 2093 goto error; 2094 2095 err = ovs_internal_dev_rtnl_link_register(); 2096 if (err) 2097 goto error_action_fifos_exit; 2098 2099 err = ovs_flow_init(); 2100 if (err) 2101 goto error_unreg_rtnl_link; 2102 2103 err = ovs_vport_init(); 2104 if (err) 2105 goto error_flow_exit; 2106 2107 err = register_pernet_device(&ovs_net_ops); 2108 if (err) 2109 goto error_vport_exit; 2110 2111 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2112 if (err) 2113 goto error_netns_exit; 2114 2115 err = dp_register_genl(); 2116 if (err < 0) 2117 goto error_unreg_notifier; 2118 2119 return 0; 2120 2121 error_unreg_notifier: 2122 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2123 error_netns_exit: 2124 unregister_pernet_device(&ovs_net_ops); 2125 error_vport_exit: 2126 ovs_vport_exit(); 2127 error_flow_exit: 2128 ovs_flow_exit(); 2129 error_unreg_rtnl_link: 2130 ovs_internal_dev_rtnl_link_unregister(); 2131 error_action_fifos_exit: 2132 action_fifos_exit(); 2133 error: 2134 return err; 2135 } 2136 2137 static void dp_cleanup(void) 2138 { 2139 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2140 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2141 unregister_pernet_device(&ovs_net_ops); 2142 rcu_barrier(); 2143 ovs_vport_exit(); 2144 ovs_flow_exit(); 2145 ovs_internal_dev_rtnl_link_unregister(); 2146 action_fifos_exit(); 2147 } 2148 2149 module_init(dp_init); 2150 module_exit(dp_cleanup); 2151 2152 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2153 MODULE_LICENSE("GPL"); 2154