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