1 /* 2 * Copyright (c) 2007-2013 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/lockdep.h> 48 #include <linux/openvswitch.h> 49 #include <linux/rculist.h> 50 #include <linux/dmi.h> 51 #include <linux/workqueue.h> 52 #include <net/genetlink.h> 53 #include <net/net_namespace.h> 54 #include <net/netns/generic.h> 55 56 #include "datapath.h" 57 #include "flow.h" 58 #include "flow_netlink.h" 59 #include "vport-internal_dev.h" 60 #include "vport-netdev.h" 61 62 int ovs_net_id __read_mostly; 63 64 static void ovs_notify(struct genl_family *family, 65 struct sk_buff *skb, struct genl_info *info) 66 { 67 genl_notify(family, skb, genl_info_net(info), info->snd_portid, 68 0, info->nlhdr, GFP_KERNEL); 69 } 70 71 /** 72 * DOC: Locking: 73 * 74 * All writes e.g. Writes to device state (add/remove datapath, port, set 75 * operations on vports, etc.), Writes to other state (flow table 76 * modifications, set miscellaneous datapath parameters, etc.) are protected 77 * by ovs_lock. 78 * 79 * Reads are protected by RCU. 80 * 81 * There are a few special cases (mostly stats) that have their own 82 * synchronization but they nest under all of above and don't interact with 83 * each other. 84 * 85 * The RTNL lock nests inside ovs_mutex. 86 */ 87 88 static DEFINE_MUTEX(ovs_mutex); 89 90 void ovs_lock(void) 91 { 92 mutex_lock(&ovs_mutex); 93 } 94 95 void ovs_unlock(void) 96 { 97 mutex_unlock(&ovs_mutex); 98 } 99 100 #ifdef CONFIG_LOCKDEP 101 int lockdep_ovsl_is_held(void) 102 { 103 if (debug_locks) 104 return lockdep_is_held(&ovs_mutex); 105 else 106 return 1; 107 } 108 #endif 109 110 static struct vport *new_vport(const struct vport_parms *); 111 static int queue_gso_packets(struct datapath *dp, struct sk_buff *, 112 const struct dp_upcall_info *); 113 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *, 114 const struct dp_upcall_info *); 115 116 /* Must be called with rcu_read_lock or ovs_mutex. */ 117 static struct datapath *get_dp(struct net *net, int dp_ifindex) 118 { 119 struct datapath *dp = NULL; 120 struct net_device *dev; 121 122 rcu_read_lock(); 123 dev = dev_get_by_index_rcu(net, dp_ifindex); 124 if (dev) { 125 struct vport *vport = ovs_internal_dev_get_vport(dev); 126 if (vport) 127 dp = vport->dp; 128 } 129 rcu_read_unlock(); 130 131 return dp; 132 } 133 134 /* Must be called with rcu_read_lock or ovs_mutex. */ 135 static const char *ovs_dp_name(const struct datapath *dp) 136 { 137 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); 138 return vport->ops->get_name(vport); 139 } 140 141 static int get_dpifindex(struct datapath *dp) 142 { 143 struct vport *local; 144 int ifindex; 145 146 rcu_read_lock(); 147 148 local = ovs_vport_rcu(dp, OVSP_LOCAL); 149 if (local) 150 ifindex = netdev_vport_priv(local)->dev->ifindex; 151 else 152 ifindex = 0; 153 154 rcu_read_unlock(); 155 156 return ifindex; 157 } 158 159 static void destroy_dp_rcu(struct rcu_head *rcu) 160 { 161 struct datapath *dp = container_of(rcu, struct datapath, rcu); 162 163 ovs_flow_tbl_destroy(&dp->table); 164 free_percpu(dp->stats_percpu); 165 release_net(ovs_dp_get_net(dp)); 166 kfree(dp->ports); 167 kfree(dp); 168 } 169 170 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 171 u16 port_no) 172 { 173 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 174 } 175 176 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 177 { 178 struct vport *vport; 179 struct hlist_head *head; 180 181 head = vport_hash_bucket(dp, port_no); 182 hlist_for_each_entry_rcu(vport, head, dp_hash_node) { 183 if (vport->port_no == port_no) 184 return vport; 185 } 186 return NULL; 187 } 188 189 /* Called with ovs_mutex. */ 190 static struct vport *new_vport(const struct vport_parms *parms) 191 { 192 struct vport *vport; 193 194 vport = ovs_vport_add(parms); 195 if (!IS_ERR(vport)) { 196 struct datapath *dp = parms->dp; 197 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 198 199 hlist_add_head_rcu(&vport->dp_hash_node, head); 200 } 201 return vport; 202 } 203 204 void ovs_dp_detach_port(struct vport *p) 205 { 206 ASSERT_OVSL(); 207 208 /* First drop references to device. */ 209 hlist_del_rcu(&p->dp_hash_node); 210 211 /* Then destroy it. */ 212 ovs_vport_del(p); 213 } 214 215 /* Must be called with rcu_read_lock. */ 216 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb) 217 { 218 struct datapath *dp = p->dp; 219 struct sw_flow *flow; 220 struct dp_stats_percpu *stats; 221 struct sw_flow_key key; 222 u64 *stats_counter; 223 u32 n_mask_hit; 224 int error; 225 226 stats = this_cpu_ptr(dp->stats_percpu); 227 228 /* Extract flow from 'skb' into 'key'. */ 229 error = ovs_flow_extract(skb, p->port_no, &key); 230 if (unlikely(error)) { 231 kfree_skb(skb); 232 return; 233 } 234 235 /* Look up flow. */ 236 flow = ovs_flow_tbl_lookup_stats(&dp->table, &key, &n_mask_hit); 237 if (unlikely(!flow)) { 238 struct dp_upcall_info upcall; 239 240 upcall.cmd = OVS_PACKET_CMD_MISS; 241 upcall.key = &key; 242 upcall.userdata = NULL; 243 upcall.portid = p->upcall_portid; 244 ovs_dp_upcall(dp, skb, &upcall); 245 consume_skb(skb); 246 stats_counter = &stats->n_missed; 247 goto out; 248 } 249 250 OVS_CB(skb)->flow = flow; 251 OVS_CB(skb)->pkt_key = &key; 252 253 ovs_flow_stats_update(OVS_CB(skb)->flow, skb); 254 ovs_execute_actions(dp, skb); 255 stats_counter = &stats->n_hit; 256 257 out: 258 /* Update datapath statistics. */ 259 u64_stats_update_begin(&stats->sync); 260 (*stats_counter)++; 261 stats->n_mask_hit += n_mask_hit; 262 u64_stats_update_end(&stats->sync); 263 } 264 265 static struct genl_family dp_packet_genl_family = { 266 .id = GENL_ID_GENERATE, 267 .hdrsize = sizeof(struct ovs_header), 268 .name = OVS_PACKET_FAMILY, 269 .version = OVS_PACKET_VERSION, 270 .maxattr = OVS_PACKET_ATTR_MAX, 271 .netnsok = true, 272 .parallel_ops = true, 273 }; 274 275 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 276 const struct dp_upcall_info *upcall_info) 277 { 278 struct dp_stats_percpu *stats; 279 int err; 280 281 if (upcall_info->portid == 0) { 282 err = -ENOTCONN; 283 goto err; 284 } 285 286 if (!skb_is_gso(skb)) 287 err = queue_userspace_packet(dp, skb, upcall_info); 288 else 289 err = queue_gso_packets(dp, skb, upcall_info); 290 if (err) 291 goto err; 292 293 return 0; 294 295 err: 296 stats = this_cpu_ptr(dp->stats_percpu); 297 298 u64_stats_update_begin(&stats->sync); 299 stats->n_lost++; 300 u64_stats_update_end(&stats->sync); 301 302 return err; 303 } 304 305 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 306 const struct dp_upcall_info *upcall_info) 307 { 308 unsigned short gso_type = skb_shinfo(skb)->gso_type; 309 struct dp_upcall_info later_info; 310 struct sw_flow_key later_key; 311 struct sk_buff *segs, *nskb; 312 int err; 313 314 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 315 if (IS_ERR(segs)) 316 return PTR_ERR(segs); 317 318 /* Queue all of the segments. */ 319 skb = segs; 320 do { 321 err = queue_userspace_packet(dp, skb, upcall_info); 322 if (err) 323 break; 324 325 if (skb == segs && gso_type & SKB_GSO_UDP) { 326 /* The initial flow key extracted by ovs_flow_extract() 327 * in this case is for a first fragment, so we need to 328 * properly mark later fragments. 329 */ 330 later_key = *upcall_info->key; 331 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 332 333 later_info = *upcall_info; 334 later_info.key = &later_key; 335 upcall_info = &later_info; 336 } 337 } while ((skb = skb->next)); 338 339 /* Free all of the segments. */ 340 skb = segs; 341 do { 342 nskb = skb->next; 343 if (err) 344 kfree_skb(skb); 345 else 346 consume_skb(skb); 347 } while ((skb = nskb)); 348 return err; 349 } 350 351 static size_t key_attr_size(void) 352 { 353 return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */ 354 + nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */ 355 + nla_total_size(8) /* OVS_TUNNEL_KEY_ATTR_ID */ 356 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */ 357 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */ 358 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TOS */ 359 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TTL */ 360 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */ 361 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_CSUM */ 362 + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */ 363 + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */ 364 + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */ 365 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */ 366 + nla_total_size(4) /* OVS_KEY_ATTR_8021Q */ 367 + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */ 368 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */ 369 + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */ 370 + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */ 371 + nla_total_size(28); /* OVS_KEY_ATTR_ND */ 372 } 373 374 static size_t upcall_msg_size(const struct nlattr *userdata, 375 unsigned int hdrlen) 376 { 377 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 378 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 379 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */ 380 381 /* OVS_PACKET_ATTR_USERDATA */ 382 if (userdata) 383 size += NLA_ALIGN(userdata->nla_len); 384 385 return size; 386 } 387 388 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 389 const struct dp_upcall_info *upcall_info) 390 { 391 struct ovs_header *upcall; 392 struct sk_buff *nskb = NULL; 393 struct sk_buff *user_skb; /* to be queued to userspace */ 394 struct nlattr *nla; 395 struct genl_info info = { 396 .dst_sk = ovs_dp_get_net(dp)->genl_sock, 397 .snd_portid = upcall_info->portid, 398 }; 399 size_t len; 400 unsigned int hlen; 401 int err, dp_ifindex; 402 403 dp_ifindex = get_dpifindex(dp); 404 if (!dp_ifindex) 405 return -ENODEV; 406 407 if (vlan_tx_tag_present(skb)) { 408 nskb = skb_clone(skb, GFP_ATOMIC); 409 if (!nskb) 410 return -ENOMEM; 411 412 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb)); 413 if (!nskb) 414 return -ENOMEM; 415 416 nskb->vlan_tci = 0; 417 skb = nskb; 418 } 419 420 if (nla_attr_size(skb->len) > USHRT_MAX) { 421 err = -EFBIG; 422 goto out; 423 } 424 425 /* Complete checksum if needed */ 426 if (skb->ip_summed == CHECKSUM_PARTIAL && 427 (err = skb_checksum_help(skb))) 428 goto out; 429 430 /* Older versions of OVS user space enforce alignment of the last 431 * Netlink attribute to NLA_ALIGNTO which would require extensive 432 * padding logic. Only perform zerocopy if padding is not required. 433 */ 434 if (dp->user_features & OVS_DP_F_UNALIGNED) 435 hlen = skb_zerocopy_headlen(skb); 436 else 437 hlen = skb->len; 438 439 len = upcall_msg_size(upcall_info->userdata, hlen); 440 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC); 441 if (!user_skb) { 442 err = -ENOMEM; 443 goto out; 444 } 445 446 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 447 0, upcall_info->cmd); 448 upcall->dp_ifindex = dp_ifindex; 449 450 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY); 451 ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb); 452 nla_nest_end(user_skb, nla); 453 454 if (upcall_info->userdata) 455 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 456 nla_len(upcall_info->userdata), 457 nla_data(upcall_info->userdata)); 458 459 /* Only reserve room for attribute header, packet data is added 460 * in skb_zerocopy() */ 461 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 462 err = -ENOBUFS; 463 goto out; 464 } 465 nla->nla_len = nla_attr_size(skb->len); 466 467 skb_zerocopy(user_skb, skb, skb->len, hlen); 468 469 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 470 471 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 472 out: 473 kfree_skb(nskb); 474 return err; 475 } 476 477 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 478 { 479 struct ovs_header *ovs_header = info->userhdr; 480 struct nlattr **a = info->attrs; 481 struct sw_flow_actions *acts; 482 struct sk_buff *packet; 483 struct sw_flow *flow; 484 struct datapath *dp; 485 struct ethhdr *eth; 486 int len; 487 int err; 488 489 err = -EINVAL; 490 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 491 !a[OVS_PACKET_ATTR_ACTIONS]) 492 goto err; 493 494 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 495 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 496 err = -ENOMEM; 497 if (!packet) 498 goto err; 499 skb_reserve(packet, NET_IP_ALIGN); 500 501 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 502 503 skb_reset_mac_header(packet); 504 eth = eth_hdr(packet); 505 506 /* Normally, setting the skb 'protocol' field would be handled by a 507 * call to eth_type_trans(), but it assumes there's a sending 508 * device, which we may not have. */ 509 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) 510 packet->protocol = eth->h_proto; 511 else 512 packet->protocol = htons(ETH_P_802_2); 513 514 /* Build an sw_flow for sending this packet. */ 515 flow = ovs_flow_alloc(false); 516 err = PTR_ERR(flow); 517 if (IS_ERR(flow)) 518 goto err_kfree_skb; 519 520 err = ovs_flow_extract(packet, -1, &flow->key); 521 if (err) 522 goto err_flow_free; 523 524 err = ovs_nla_get_flow_metadata(flow, a[OVS_PACKET_ATTR_KEY]); 525 if (err) 526 goto err_flow_free; 527 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS])); 528 err = PTR_ERR(acts); 529 if (IS_ERR(acts)) 530 goto err_flow_free; 531 532 err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS], 533 &flow->key, 0, &acts); 534 rcu_assign_pointer(flow->sf_acts, acts); 535 if (err) 536 goto err_flow_free; 537 538 OVS_CB(packet)->flow = flow; 539 OVS_CB(packet)->pkt_key = &flow->key; 540 packet->priority = flow->key.phy.priority; 541 packet->mark = flow->key.phy.skb_mark; 542 543 rcu_read_lock(); 544 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 545 err = -ENODEV; 546 if (!dp) 547 goto err_unlock; 548 549 local_bh_disable(); 550 err = ovs_execute_actions(dp, packet); 551 local_bh_enable(); 552 rcu_read_unlock(); 553 554 ovs_flow_free(flow, false); 555 return err; 556 557 err_unlock: 558 rcu_read_unlock(); 559 err_flow_free: 560 ovs_flow_free(flow, false); 561 err_kfree_skb: 562 kfree_skb(packet); 563 err: 564 return err; 565 } 566 567 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 568 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 569 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 570 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 571 }; 572 573 static const struct genl_ops dp_packet_genl_ops[] = { 574 { .cmd = OVS_PACKET_CMD_EXECUTE, 575 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 576 .policy = packet_policy, 577 .doit = ovs_packet_cmd_execute 578 } 579 }; 580 581 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats, 582 struct ovs_dp_megaflow_stats *mega_stats) 583 { 584 int i; 585 586 memset(mega_stats, 0, sizeof(*mega_stats)); 587 588 stats->n_flows = ovs_flow_tbl_count(&dp->table); 589 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 590 591 stats->n_hit = stats->n_missed = stats->n_lost = 0; 592 593 for_each_possible_cpu(i) { 594 const struct dp_stats_percpu *percpu_stats; 595 struct dp_stats_percpu local_stats; 596 unsigned int start; 597 598 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 599 600 do { 601 start = u64_stats_fetch_begin_bh(&percpu_stats->sync); 602 local_stats = *percpu_stats; 603 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start)); 604 605 stats->n_hit += local_stats.n_hit; 606 stats->n_missed += local_stats.n_missed; 607 stats->n_lost += local_stats.n_lost; 608 mega_stats->n_mask_hit += local_stats.n_mask_hit; 609 } 610 } 611 612 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 613 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 614 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 615 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 616 }; 617 618 static struct genl_family dp_flow_genl_family = { 619 .id = GENL_ID_GENERATE, 620 .hdrsize = sizeof(struct ovs_header), 621 .name = OVS_FLOW_FAMILY, 622 .version = OVS_FLOW_VERSION, 623 .maxattr = OVS_FLOW_ATTR_MAX, 624 .netnsok = true, 625 .parallel_ops = true, 626 }; 627 628 static struct genl_multicast_group ovs_dp_flow_multicast_group = { 629 .name = OVS_FLOW_MCGROUP 630 }; 631 632 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts) 633 { 634 return NLMSG_ALIGN(sizeof(struct ovs_header)) 635 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */ 636 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */ 637 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 638 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 639 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */ 640 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */ 641 } 642 643 /* Called with ovs_mutex. */ 644 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp, 645 struct sk_buff *skb, u32 portid, 646 u32 seq, u32 flags, u8 cmd) 647 { 648 const int skb_orig_len = skb->len; 649 struct nlattr *start; 650 struct ovs_flow_stats stats; 651 __be16 tcp_flags; 652 unsigned long used; 653 struct ovs_header *ovs_header; 654 struct nlattr *nla; 655 int err; 656 657 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd); 658 if (!ovs_header) 659 return -EMSGSIZE; 660 661 ovs_header->dp_ifindex = get_dpifindex(dp); 662 663 /* Fill flow key. */ 664 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY); 665 if (!nla) 666 goto nla_put_failure; 667 668 err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb); 669 if (err) 670 goto error; 671 nla_nest_end(skb, nla); 672 673 nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK); 674 if (!nla) 675 goto nla_put_failure; 676 677 err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb); 678 if (err) 679 goto error; 680 681 nla_nest_end(skb, nla); 682 683 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 684 if (used && 685 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used))) 686 goto nla_put_failure; 687 688 if (stats.n_packets && 689 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats)) 690 goto nla_put_failure; 691 692 if ((u8)ntohs(tcp_flags) && 693 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 694 goto nla_put_failure; 695 696 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 697 * this is the first flow to be dumped into 'skb'. This is unusual for 698 * Netlink but individual action lists can be longer than 699 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 700 * The userspace caller can always fetch the actions separately if it 701 * really wants them. (Most userspace callers in fact don't care.) 702 * 703 * This can only fail for dump operations because the skb is always 704 * properly sized for single flows. 705 */ 706 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS); 707 if (start) { 708 const struct sw_flow_actions *sf_acts; 709 710 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 711 712 err = ovs_nla_put_actions(sf_acts->actions, 713 sf_acts->actions_len, skb); 714 if (!err) 715 nla_nest_end(skb, start); 716 else { 717 if (skb_orig_len) 718 goto error; 719 720 nla_nest_cancel(skb, start); 721 } 722 } else if (skb_orig_len) 723 goto nla_put_failure; 724 725 return genlmsg_end(skb, ovs_header); 726 727 nla_put_failure: 728 err = -EMSGSIZE; 729 error: 730 genlmsg_cancel(skb, ovs_header); 731 return err; 732 } 733 734 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow, 735 struct genl_info *info) 736 { 737 size_t len; 738 739 len = ovs_flow_cmd_msg_size(ovsl_dereference(flow->sf_acts)); 740 741 return genlmsg_new_unicast(len, info, GFP_KERNEL); 742 } 743 744 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow, 745 struct datapath *dp, 746 struct genl_info *info, 747 u8 cmd) 748 { 749 struct sk_buff *skb; 750 int retval; 751 752 skb = ovs_flow_cmd_alloc_info(flow, info); 753 if (!skb) 754 return ERR_PTR(-ENOMEM); 755 756 retval = ovs_flow_cmd_fill_info(flow, dp, skb, info->snd_portid, 757 info->snd_seq, 0, cmd); 758 BUG_ON(retval < 0); 759 return skb; 760 } 761 762 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info) 763 { 764 struct nlattr **a = info->attrs; 765 struct ovs_header *ovs_header = info->userhdr; 766 struct sw_flow_key key, masked_key; 767 struct sw_flow *flow = NULL; 768 struct sw_flow_mask mask; 769 struct sk_buff *reply; 770 struct datapath *dp; 771 struct sw_flow_actions *acts = NULL; 772 struct sw_flow_match match; 773 bool exact_5tuple; 774 int error; 775 776 /* Extract key. */ 777 error = -EINVAL; 778 if (!a[OVS_FLOW_ATTR_KEY]) 779 goto error; 780 781 ovs_match_init(&match, &key, &mask); 782 error = ovs_nla_get_match(&match, &exact_5tuple, 783 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]); 784 if (error) 785 goto error; 786 787 /* Validate actions. */ 788 if (a[OVS_FLOW_ATTR_ACTIONS]) { 789 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS])); 790 error = PTR_ERR(acts); 791 if (IS_ERR(acts)) 792 goto error; 793 794 ovs_flow_mask_key(&masked_key, &key, &mask); 795 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], 796 &masked_key, 0, &acts); 797 if (error) { 798 OVS_NLERR("Flow actions may not be safe on all matching packets.\n"); 799 goto err_kfree; 800 } 801 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) { 802 error = -EINVAL; 803 goto error; 804 } 805 806 ovs_lock(); 807 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 808 error = -ENODEV; 809 if (!dp) 810 goto err_unlock_ovs; 811 812 /* Check if this is a duplicate flow */ 813 flow = ovs_flow_tbl_lookup(&dp->table, &key); 814 if (!flow) { 815 /* Bail out if we're not allowed to create a new flow. */ 816 error = -ENOENT; 817 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET) 818 goto err_unlock_ovs; 819 820 /* Allocate flow. */ 821 flow = ovs_flow_alloc(!exact_5tuple); 822 if (IS_ERR(flow)) { 823 error = PTR_ERR(flow); 824 goto err_unlock_ovs; 825 } 826 827 flow->key = masked_key; 828 flow->unmasked_key = key; 829 rcu_assign_pointer(flow->sf_acts, acts); 830 831 /* Put flow in bucket. */ 832 error = ovs_flow_tbl_insert(&dp->table, flow, &mask); 833 if (error) { 834 acts = NULL; 835 goto err_flow_free; 836 } 837 838 reply = ovs_flow_cmd_build_info(flow, dp, info, OVS_FLOW_CMD_NEW); 839 } else { 840 /* We found a matching flow. */ 841 struct sw_flow_actions *old_acts; 842 843 /* Bail out if we're not allowed to modify an existing flow. 844 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 845 * because Generic Netlink treats the latter as a dump 846 * request. We also accept NLM_F_EXCL in case that bug ever 847 * gets fixed. 848 */ 849 error = -EEXIST; 850 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW && 851 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL)) 852 goto err_unlock_ovs; 853 854 /* The unmasked key has to be the same for flow updates. */ 855 error = -EINVAL; 856 if (!ovs_flow_cmp_unmasked_key(flow, &match)) { 857 OVS_NLERR("Flow modification message rejected, unmasked key does not match.\n"); 858 goto err_unlock_ovs; 859 } 860 861 /* Update actions. */ 862 old_acts = ovsl_dereference(flow->sf_acts); 863 rcu_assign_pointer(flow->sf_acts, acts); 864 ovs_nla_free_flow_actions(old_acts); 865 866 reply = ovs_flow_cmd_build_info(flow, dp, info, OVS_FLOW_CMD_NEW); 867 868 /* Clear stats. */ 869 if (a[OVS_FLOW_ATTR_CLEAR]) 870 ovs_flow_stats_clear(flow); 871 } 872 ovs_unlock(); 873 874 if (!IS_ERR(reply)) 875 ovs_notify(&dp_flow_genl_family, reply, info); 876 else 877 genl_set_err(&dp_flow_genl_family, sock_net(skb->sk), 0, 878 0, PTR_ERR(reply)); 879 return 0; 880 881 err_flow_free: 882 ovs_flow_free(flow, false); 883 err_unlock_ovs: 884 ovs_unlock(); 885 err_kfree: 886 kfree(acts); 887 error: 888 return error; 889 } 890 891 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 892 { 893 struct nlattr **a = info->attrs; 894 struct ovs_header *ovs_header = info->userhdr; 895 struct sw_flow_key key; 896 struct sk_buff *reply; 897 struct sw_flow *flow; 898 struct datapath *dp; 899 struct sw_flow_match match; 900 int err; 901 902 if (!a[OVS_FLOW_ATTR_KEY]) { 903 OVS_NLERR("Flow get message rejected, Key attribute missing.\n"); 904 return -EINVAL; 905 } 906 907 ovs_match_init(&match, &key, NULL); 908 err = ovs_nla_get_match(&match, NULL, a[OVS_FLOW_ATTR_KEY], NULL); 909 if (err) 910 return err; 911 912 ovs_lock(); 913 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 914 if (!dp) { 915 err = -ENODEV; 916 goto unlock; 917 } 918 919 flow = ovs_flow_tbl_lookup(&dp->table, &key); 920 if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) { 921 err = -ENOENT; 922 goto unlock; 923 } 924 925 reply = ovs_flow_cmd_build_info(flow, dp, info, OVS_FLOW_CMD_NEW); 926 if (IS_ERR(reply)) { 927 err = PTR_ERR(reply); 928 goto unlock; 929 } 930 931 ovs_unlock(); 932 return genlmsg_reply(reply, info); 933 unlock: 934 ovs_unlock(); 935 return err; 936 } 937 938 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 939 { 940 struct nlattr **a = info->attrs; 941 struct ovs_header *ovs_header = info->userhdr; 942 struct sw_flow_key key; 943 struct sk_buff *reply; 944 struct sw_flow *flow; 945 struct datapath *dp; 946 struct sw_flow_match match; 947 int err; 948 949 ovs_lock(); 950 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 951 if (!dp) { 952 err = -ENODEV; 953 goto unlock; 954 } 955 956 if (!a[OVS_FLOW_ATTR_KEY]) { 957 err = ovs_flow_tbl_flush(&dp->table); 958 goto unlock; 959 } 960 961 ovs_match_init(&match, &key, NULL); 962 err = ovs_nla_get_match(&match, NULL, a[OVS_FLOW_ATTR_KEY], NULL); 963 if (err) 964 goto unlock; 965 966 flow = ovs_flow_tbl_lookup(&dp->table, &key); 967 if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) { 968 err = -ENOENT; 969 goto unlock; 970 } 971 972 reply = ovs_flow_cmd_alloc_info(flow, info); 973 if (!reply) { 974 err = -ENOMEM; 975 goto unlock; 976 } 977 978 ovs_flow_tbl_remove(&dp->table, flow); 979 980 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid, 981 info->snd_seq, 0, OVS_FLOW_CMD_DEL); 982 BUG_ON(err < 0); 983 984 ovs_flow_free(flow, true); 985 ovs_unlock(); 986 987 ovs_notify(&dp_flow_genl_family, reply, info); 988 return 0; 989 unlock: 990 ovs_unlock(); 991 return err; 992 } 993 994 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 995 { 996 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 997 struct table_instance *ti; 998 struct datapath *dp; 999 1000 rcu_read_lock(); 1001 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1002 if (!dp) { 1003 rcu_read_unlock(); 1004 return -ENODEV; 1005 } 1006 1007 ti = rcu_dereference(dp->table.ti); 1008 for (;;) { 1009 struct sw_flow *flow; 1010 u32 bucket, obj; 1011 1012 bucket = cb->args[0]; 1013 obj = cb->args[1]; 1014 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1015 if (!flow) 1016 break; 1017 1018 if (ovs_flow_cmd_fill_info(flow, dp, skb, 1019 NETLINK_CB(cb->skb).portid, 1020 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1021 OVS_FLOW_CMD_NEW) < 0) 1022 break; 1023 1024 cb->args[0] = bucket; 1025 cb->args[1] = obj; 1026 } 1027 rcu_read_unlock(); 1028 return skb->len; 1029 } 1030 1031 static const struct genl_ops dp_flow_genl_ops[] = { 1032 { .cmd = OVS_FLOW_CMD_NEW, 1033 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1034 .policy = flow_policy, 1035 .doit = ovs_flow_cmd_new_or_set 1036 }, 1037 { .cmd = OVS_FLOW_CMD_DEL, 1038 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1039 .policy = flow_policy, 1040 .doit = ovs_flow_cmd_del 1041 }, 1042 { .cmd = OVS_FLOW_CMD_GET, 1043 .flags = 0, /* OK for unprivileged users. */ 1044 .policy = flow_policy, 1045 .doit = ovs_flow_cmd_get, 1046 .dumpit = ovs_flow_cmd_dump 1047 }, 1048 { .cmd = OVS_FLOW_CMD_SET, 1049 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1050 .policy = flow_policy, 1051 .doit = ovs_flow_cmd_new_or_set, 1052 }, 1053 }; 1054 1055 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1056 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1057 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1058 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1059 }; 1060 1061 static struct genl_family dp_datapath_genl_family = { 1062 .id = GENL_ID_GENERATE, 1063 .hdrsize = sizeof(struct ovs_header), 1064 .name = OVS_DATAPATH_FAMILY, 1065 .version = OVS_DATAPATH_VERSION, 1066 .maxattr = OVS_DP_ATTR_MAX, 1067 .netnsok = true, 1068 .parallel_ops = true, 1069 }; 1070 1071 static struct genl_multicast_group ovs_dp_datapath_multicast_group = { 1072 .name = OVS_DATAPATH_MCGROUP 1073 }; 1074 1075 static size_t ovs_dp_cmd_msg_size(void) 1076 { 1077 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1078 1079 msgsize += nla_total_size(IFNAMSIZ); 1080 msgsize += nla_total_size(sizeof(struct ovs_dp_stats)); 1081 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats)); 1082 1083 return msgsize; 1084 } 1085 1086 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1087 u32 portid, u32 seq, u32 flags, u8 cmd) 1088 { 1089 struct ovs_header *ovs_header; 1090 struct ovs_dp_stats dp_stats; 1091 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1092 int err; 1093 1094 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1095 flags, cmd); 1096 if (!ovs_header) 1097 goto error; 1098 1099 ovs_header->dp_ifindex = get_dpifindex(dp); 1100 1101 rcu_read_lock(); 1102 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1103 rcu_read_unlock(); 1104 if (err) 1105 goto nla_put_failure; 1106 1107 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1108 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1109 &dp_stats)) 1110 goto nla_put_failure; 1111 1112 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1113 sizeof(struct ovs_dp_megaflow_stats), 1114 &dp_megaflow_stats)) 1115 goto nla_put_failure; 1116 1117 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1118 goto nla_put_failure; 1119 1120 return genlmsg_end(skb, ovs_header); 1121 1122 nla_put_failure: 1123 genlmsg_cancel(skb, ovs_header); 1124 error: 1125 return -EMSGSIZE; 1126 } 1127 1128 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, 1129 struct genl_info *info, u8 cmd) 1130 { 1131 struct sk_buff *skb; 1132 int retval; 1133 1134 skb = genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL); 1135 if (!skb) 1136 return ERR_PTR(-ENOMEM); 1137 1138 retval = ovs_dp_cmd_fill_info(dp, skb, info->snd_portid, info->snd_seq, 0, cmd); 1139 if (retval < 0) { 1140 kfree_skb(skb); 1141 return ERR_PTR(retval); 1142 } 1143 return skb; 1144 } 1145 1146 /* Called with ovs_mutex. */ 1147 static struct datapath *lookup_datapath(struct net *net, 1148 struct ovs_header *ovs_header, 1149 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1150 { 1151 struct datapath *dp; 1152 1153 if (!a[OVS_DP_ATTR_NAME]) 1154 dp = get_dp(net, ovs_header->dp_ifindex); 1155 else { 1156 struct vport *vport; 1157 1158 rcu_read_lock(); 1159 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1160 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1161 rcu_read_unlock(); 1162 } 1163 return dp ? dp : ERR_PTR(-ENODEV); 1164 } 1165 1166 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info) 1167 { 1168 struct datapath *dp; 1169 1170 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1171 if (!dp) 1172 return; 1173 1174 WARN(dp->user_features, "Dropping previously announced user features\n"); 1175 dp->user_features = 0; 1176 } 1177 1178 static void ovs_dp_change(struct datapath *dp, struct nlattr **a) 1179 { 1180 if (a[OVS_DP_ATTR_USER_FEATURES]) 1181 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1182 } 1183 1184 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1185 { 1186 struct nlattr **a = info->attrs; 1187 struct vport_parms parms; 1188 struct sk_buff *reply; 1189 struct datapath *dp; 1190 struct vport *vport; 1191 struct ovs_net *ovs_net; 1192 int err, i; 1193 1194 err = -EINVAL; 1195 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1196 goto err; 1197 1198 ovs_lock(); 1199 1200 err = -ENOMEM; 1201 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1202 if (dp == NULL) 1203 goto err_unlock_ovs; 1204 1205 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk))); 1206 1207 /* Allocate table. */ 1208 err = ovs_flow_tbl_init(&dp->table); 1209 if (err) 1210 goto err_free_dp; 1211 1212 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu); 1213 if (!dp->stats_percpu) { 1214 err = -ENOMEM; 1215 goto err_destroy_table; 1216 } 1217 1218 for_each_possible_cpu(i) { 1219 struct dp_stats_percpu *dpath_stats; 1220 dpath_stats = per_cpu_ptr(dp->stats_percpu, i); 1221 u64_stats_init(&dpath_stats->sync); 1222 } 1223 1224 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head), 1225 GFP_KERNEL); 1226 if (!dp->ports) { 1227 err = -ENOMEM; 1228 goto err_destroy_percpu; 1229 } 1230 1231 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1232 INIT_HLIST_HEAD(&dp->ports[i]); 1233 1234 /* Set up our datapath device. */ 1235 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1236 parms.type = OVS_VPORT_TYPE_INTERNAL; 1237 parms.options = NULL; 1238 parms.dp = dp; 1239 parms.port_no = OVSP_LOCAL; 1240 parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]); 1241 1242 ovs_dp_change(dp, a); 1243 1244 vport = new_vport(&parms); 1245 if (IS_ERR(vport)) { 1246 err = PTR_ERR(vport); 1247 if (err == -EBUSY) 1248 err = -EEXIST; 1249 1250 if (err == -EEXIST) { 1251 /* An outdated user space instance that does not understand 1252 * the concept of user_features has attempted to create a new 1253 * datapath and is likely to reuse it. Drop all user features. 1254 */ 1255 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1256 ovs_dp_reset_user_features(skb, info); 1257 } 1258 1259 goto err_destroy_ports_array; 1260 } 1261 1262 reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW); 1263 err = PTR_ERR(reply); 1264 if (IS_ERR(reply)) 1265 goto err_destroy_local_port; 1266 1267 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1268 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1269 1270 ovs_unlock(); 1271 1272 ovs_notify(&dp_datapath_genl_family, reply, info); 1273 return 0; 1274 1275 err_destroy_local_port: 1276 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1277 err_destroy_ports_array: 1278 kfree(dp->ports); 1279 err_destroy_percpu: 1280 free_percpu(dp->stats_percpu); 1281 err_destroy_table: 1282 ovs_flow_tbl_destroy(&dp->table); 1283 err_free_dp: 1284 release_net(ovs_dp_get_net(dp)); 1285 kfree(dp); 1286 err_unlock_ovs: 1287 ovs_unlock(); 1288 err: 1289 return err; 1290 } 1291 1292 /* Called with ovs_mutex. */ 1293 static void __dp_destroy(struct datapath *dp) 1294 { 1295 int i; 1296 1297 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1298 struct vport *vport; 1299 struct hlist_node *n; 1300 1301 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1302 if (vport->port_no != OVSP_LOCAL) 1303 ovs_dp_detach_port(vport); 1304 } 1305 1306 list_del_rcu(&dp->list_node); 1307 1308 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1309 * all port in datapath are destroyed first before freeing datapath. 1310 */ 1311 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1312 1313 call_rcu(&dp->rcu, destroy_dp_rcu); 1314 } 1315 1316 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1317 { 1318 struct sk_buff *reply; 1319 struct datapath *dp; 1320 int err; 1321 1322 ovs_lock(); 1323 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1324 err = PTR_ERR(dp); 1325 if (IS_ERR(dp)) 1326 goto unlock; 1327 1328 reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_DEL); 1329 err = PTR_ERR(reply); 1330 if (IS_ERR(reply)) 1331 goto unlock; 1332 1333 __dp_destroy(dp); 1334 ovs_unlock(); 1335 1336 ovs_notify(&dp_datapath_genl_family, reply, info); 1337 1338 return 0; 1339 unlock: 1340 ovs_unlock(); 1341 return err; 1342 } 1343 1344 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1345 { 1346 struct sk_buff *reply; 1347 struct datapath *dp; 1348 int err; 1349 1350 ovs_lock(); 1351 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1352 err = PTR_ERR(dp); 1353 if (IS_ERR(dp)) 1354 goto unlock; 1355 1356 ovs_dp_change(dp, info->attrs); 1357 1358 reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW); 1359 if (IS_ERR(reply)) { 1360 err = PTR_ERR(reply); 1361 genl_set_err(&dp_datapath_genl_family, sock_net(skb->sk), 0, 1362 0, err); 1363 err = 0; 1364 goto unlock; 1365 } 1366 1367 ovs_unlock(); 1368 ovs_notify(&dp_datapath_genl_family, reply, info); 1369 1370 return 0; 1371 unlock: 1372 ovs_unlock(); 1373 return err; 1374 } 1375 1376 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1377 { 1378 struct sk_buff *reply; 1379 struct datapath *dp; 1380 int err; 1381 1382 ovs_lock(); 1383 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1384 if (IS_ERR(dp)) { 1385 err = PTR_ERR(dp); 1386 goto unlock; 1387 } 1388 1389 reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW); 1390 if (IS_ERR(reply)) { 1391 err = PTR_ERR(reply); 1392 goto unlock; 1393 } 1394 1395 ovs_unlock(); 1396 return genlmsg_reply(reply, info); 1397 1398 unlock: 1399 ovs_unlock(); 1400 return err; 1401 } 1402 1403 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1404 { 1405 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1406 struct datapath *dp; 1407 int skip = cb->args[0]; 1408 int i = 0; 1409 1410 rcu_read_lock(); 1411 list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) { 1412 if (i >= skip && 1413 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1414 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1415 OVS_DP_CMD_NEW) < 0) 1416 break; 1417 i++; 1418 } 1419 rcu_read_unlock(); 1420 1421 cb->args[0] = i; 1422 1423 return skb->len; 1424 } 1425 1426 static const struct genl_ops dp_datapath_genl_ops[] = { 1427 { .cmd = OVS_DP_CMD_NEW, 1428 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1429 .policy = datapath_policy, 1430 .doit = ovs_dp_cmd_new 1431 }, 1432 { .cmd = OVS_DP_CMD_DEL, 1433 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1434 .policy = datapath_policy, 1435 .doit = ovs_dp_cmd_del 1436 }, 1437 { .cmd = OVS_DP_CMD_GET, 1438 .flags = 0, /* OK for unprivileged users. */ 1439 .policy = datapath_policy, 1440 .doit = ovs_dp_cmd_get, 1441 .dumpit = ovs_dp_cmd_dump 1442 }, 1443 { .cmd = OVS_DP_CMD_SET, 1444 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1445 .policy = datapath_policy, 1446 .doit = ovs_dp_cmd_set, 1447 }, 1448 }; 1449 1450 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 1451 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1452 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 1453 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 1454 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 1455 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1456 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 1457 }; 1458 1459 struct genl_family dp_vport_genl_family = { 1460 .id = GENL_ID_GENERATE, 1461 .hdrsize = sizeof(struct ovs_header), 1462 .name = OVS_VPORT_FAMILY, 1463 .version = OVS_VPORT_VERSION, 1464 .maxattr = OVS_VPORT_ATTR_MAX, 1465 .netnsok = true, 1466 .parallel_ops = true, 1467 }; 1468 1469 static struct genl_multicast_group ovs_dp_vport_multicast_group = { 1470 .name = OVS_VPORT_MCGROUP 1471 }; 1472 1473 /* Called with ovs_mutex or RCU read lock. */ 1474 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1475 u32 portid, u32 seq, u32 flags, u8 cmd) 1476 { 1477 struct ovs_header *ovs_header; 1478 struct ovs_vport_stats vport_stats; 1479 int err; 1480 1481 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1482 flags, cmd); 1483 if (!ovs_header) 1484 return -EMSGSIZE; 1485 1486 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1487 1488 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1489 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1490 nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) || 1491 nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid)) 1492 goto nla_put_failure; 1493 1494 ovs_vport_get_stats(vport, &vport_stats); 1495 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), 1496 &vport_stats)) 1497 goto nla_put_failure; 1498 1499 err = ovs_vport_get_options(vport, skb); 1500 if (err == -EMSGSIZE) 1501 goto error; 1502 1503 return genlmsg_end(skb, ovs_header); 1504 1505 nla_put_failure: 1506 err = -EMSGSIZE; 1507 error: 1508 genlmsg_cancel(skb, ovs_header); 1509 return err; 1510 } 1511 1512 /* Called with ovs_mutex or RCU read lock. */ 1513 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid, 1514 u32 seq, u8 cmd) 1515 { 1516 struct sk_buff *skb; 1517 int retval; 1518 1519 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1520 if (!skb) 1521 return ERR_PTR(-ENOMEM); 1522 1523 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd); 1524 BUG_ON(retval < 0); 1525 1526 return skb; 1527 } 1528 1529 /* Called with ovs_mutex or RCU read lock. */ 1530 static struct vport *lookup_vport(struct net *net, 1531 struct ovs_header *ovs_header, 1532 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1533 { 1534 struct datapath *dp; 1535 struct vport *vport; 1536 1537 if (a[OVS_VPORT_ATTR_NAME]) { 1538 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 1539 if (!vport) 1540 return ERR_PTR(-ENODEV); 1541 if (ovs_header->dp_ifindex && 1542 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 1543 return ERR_PTR(-ENODEV); 1544 return vport; 1545 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 1546 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1547 1548 if (port_no >= DP_MAX_PORTS) 1549 return ERR_PTR(-EFBIG); 1550 1551 dp = get_dp(net, ovs_header->dp_ifindex); 1552 if (!dp) 1553 return ERR_PTR(-ENODEV); 1554 1555 vport = ovs_vport_ovsl_rcu(dp, port_no); 1556 if (!vport) 1557 return ERR_PTR(-ENODEV); 1558 return vport; 1559 } else 1560 return ERR_PTR(-EINVAL); 1561 } 1562 1563 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 1564 { 1565 struct nlattr **a = info->attrs; 1566 struct ovs_header *ovs_header = info->userhdr; 1567 struct vport_parms parms; 1568 struct sk_buff *reply; 1569 struct vport *vport; 1570 struct datapath *dp; 1571 u32 port_no; 1572 int err; 1573 1574 err = -EINVAL; 1575 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 1576 !a[OVS_VPORT_ATTR_UPCALL_PID]) 1577 goto exit; 1578 1579 ovs_lock(); 1580 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1581 err = -ENODEV; 1582 if (!dp) 1583 goto exit_unlock; 1584 1585 if (a[OVS_VPORT_ATTR_PORT_NO]) { 1586 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1587 1588 err = -EFBIG; 1589 if (port_no >= DP_MAX_PORTS) 1590 goto exit_unlock; 1591 1592 vport = ovs_vport_ovsl(dp, port_no); 1593 err = -EBUSY; 1594 if (vport) 1595 goto exit_unlock; 1596 } else { 1597 for (port_no = 1; ; port_no++) { 1598 if (port_no >= DP_MAX_PORTS) { 1599 err = -EFBIG; 1600 goto exit_unlock; 1601 } 1602 vport = ovs_vport_ovsl(dp, port_no); 1603 if (!vport) 1604 break; 1605 } 1606 } 1607 1608 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 1609 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 1610 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 1611 parms.dp = dp; 1612 parms.port_no = port_no; 1613 parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); 1614 1615 vport = new_vport(&parms); 1616 err = PTR_ERR(vport); 1617 if (IS_ERR(vport)) 1618 goto exit_unlock; 1619 1620 err = 0; 1621 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, 1622 OVS_VPORT_CMD_NEW); 1623 if (IS_ERR(reply)) { 1624 err = PTR_ERR(reply); 1625 ovs_dp_detach_port(vport); 1626 goto exit_unlock; 1627 } 1628 1629 ovs_notify(&dp_vport_genl_family, reply, info); 1630 1631 exit_unlock: 1632 ovs_unlock(); 1633 exit: 1634 return err; 1635 } 1636 1637 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 1638 { 1639 struct nlattr **a = info->attrs; 1640 struct sk_buff *reply; 1641 struct vport *vport; 1642 int err; 1643 1644 ovs_lock(); 1645 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1646 err = PTR_ERR(vport); 1647 if (IS_ERR(vport)) 1648 goto exit_unlock; 1649 1650 if (a[OVS_VPORT_ATTR_TYPE] && 1651 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 1652 err = -EINVAL; 1653 goto exit_unlock; 1654 } 1655 1656 reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1657 if (!reply) { 1658 err = -ENOMEM; 1659 goto exit_unlock; 1660 } 1661 1662 if (a[OVS_VPORT_ATTR_OPTIONS]) { 1663 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 1664 if (err) 1665 goto exit_free; 1666 } 1667 1668 if (a[OVS_VPORT_ATTR_UPCALL_PID]) 1669 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); 1670 1671 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 1672 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 1673 BUG_ON(err < 0); 1674 1675 ovs_unlock(); 1676 ovs_notify(&dp_vport_genl_family, reply, info); 1677 return 0; 1678 1679 exit_free: 1680 kfree_skb(reply); 1681 exit_unlock: 1682 ovs_unlock(); 1683 return err; 1684 } 1685 1686 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 1687 { 1688 struct nlattr **a = info->attrs; 1689 struct sk_buff *reply; 1690 struct vport *vport; 1691 int err; 1692 1693 ovs_lock(); 1694 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 1695 err = PTR_ERR(vport); 1696 if (IS_ERR(vport)) 1697 goto exit_unlock; 1698 1699 if (vport->port_no == OVSP_LOCAL) { 1700 err = -EINVAL; 1701 goto exit_unlock; 1702 } 1703 1704 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, 1705 info->snd_seq, OVS_VPORT_CMD_DEL); 1706 err = PTR_ERR(reply); 1707 if (IS_ERR(reply)) 1708 goto exit_unlock; 1709 1710 err = 0; 1711 ovs_dp_detach_port(vport); 1712 1713 ovs_notify(&dp_vport_genl_family, reply, info); 1714 1715 exit_unlock: 1716 ovs_unlock(); 1717 return err; 1718 } 1719 1720 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 1721 { 1722 struct nlattr **a = info->attrs; 1723 struct ovs_header *ovs_header = info->userhdr; 1724 struct sk_buff *reply; 1725 struct vport *vport; 1726 int err; 1727 1728 rcu_read_lock(); 1729 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 1730 err = PTR_ERR(vport); 1731 if (IS_ERR(vport)) 1732 goto exit_unlock; 1733 1734 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, 1735 info->snd_seq, OVS_VPORT_CMD_NEW); 1736 err = PTR_ERR(reply); 1737 if (IS_ERR(reply)) 1738 goto exit_unlock; 1739 1740 rcu_read_unlock(); 1741 1742 return genlmsg_reply(reply, info); 1743 1744 exit_unlock: 1745 rcu_read_unlock(); 1746 return err; 1747 } 1748 1749 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1750 { 1751 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1752 struct datapath *dp; 1753 int bucket = cb->args[0], skip = cb->args[1]; 1754 int i, j = 0; 1755 1756 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1757 if (!dp) 1758 return -ENODEV; 1759 1760 rcu_read_lock(); 1761 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 1762 struct vport *vport; 1763 1764 j = 0; 1765 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 1766 if (j >= skip && 1767 ovs_vport_cmd_fill_info(vport, skb, 1768 NETLINK_CB(cb->skb).portid, 1769 cb->nlh->nlmsg_seq, 1770 NLM_F_MULTI, 1771 OVS_VPORT_CMD_NEW) < 0) 1772 goto out; 1773 1774 j++; 1775 } 1776 skip = 0; 1777 } 1778 out: 1779 rcu_read_unlock(); 1780 1781 cb->args[0] = i; 1782 cb->args[1] = j; 1783 1784 return skb->len; 1785 } 1786 1787 static const struct genl_ops dp_vport_genl_ops[] = { 1788 { .cmd = OVS_VPORT_CMD_NEW, 1789 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1790 .policy = vport_policy, 1791 .doit = ovs_vport_cmd_new 1792 }, 1793 { .cmd = OVS_VPORT_CMD_DEL, 1794 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1795 .policy = vport_policy, 1796 .doit = ovs_vport_cmd_del 1797 }, 1798 { .cmd = OVS_VPORT_CMD_GET, 1799 .flags = 0, /* OK for unprivileged users. */ 1800 .policy = vport_policy, 1801 .doit = ovs_vport_cmd_get, 1802 .dumpit = ovs_vport_cmd_dump 1803 }, 1804 { .cmd = OVS_VPORT_CMD_SET, 1805 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1806 .policy = vport_policy, 1807 .doit = ovs_vport_cmd_set, 1808 }, 1809 }; 1810 1811 struct genl_family_and_ops { 1812 struct genl_family *family; 1813 const struct genl_ops *ops; 1814 int n_ops; 1815 const struct genl_multicast_group *group; 1816 }; 1817 1818 static const struct genl_family_and_ops dp_genl_families[] = { 1819 { &dp_datapath_genl_family, 1820 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops), 1821 &ovs_dp_datapath_multicast_group }, 1822 { &dp_vport_genl_family, 1823 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops), 1824 &ovs_dp_vport_multicast_group }, 1825 { &dp_flow_genl_family, 1826 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops), 1827 &ovs_dp_flow_multicast_group }, 1828 { &dp_packet_genl_family, 1829 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops), 1830 NULL }, 1831 }; 1832 1833 static void dp_unregister_genl(int n_families) 1834 { 1835 int i; 1836 1837 for (i = 0; i < n_families; i++) 1838 genl_unregister_family(dp_genl_families[i].family); 1839 } 1840 1841 static int dp_register_genl(void) 1842 { 1843 int n_registered; 1844 int err; 1845 int i; 1846 1847 n_registered = 0; 1848 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 1849 const struct genl_family_and_ops *f = &dp_genl_families[i]; 1850 1851 f->family->ops = f->ops; 1852 f->family->n_ops = f->n_ops; 1853 f->family->mcgrps = f->group; 1854 f->family->n_mcgrps = f->group ? 1 : 0; 1855 err = genl_register_family(f->family); 1856 if (err) 1857 goto error; 1858 n_registered++; 1859 } 1860 1861 return 0; 1862 1863 error: 1864 dp_unregister_genl(n_registered); 1865 return err; 1866 } 1867 1868 static int __net_init ovs_init_net(struct net *net) 1869 { 1870 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1871 1872 INIT_LIST_HEAD(&ovs_net->dps); 1873 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 1874 return 0; 1875 } 1876 1877 static void __net_exit ovs_exit_net(struct net *net) 1878 { 1879 struct datapath *dp, *dp_next; 1880 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1881 1882 ovs_lock(); 1883 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 1884 __dp_destroy(dp); 1885 ovs_unlock(); 1886 1887 cancel_work_sync(&ovs_net->dp_notify_work); 1888 } 1889 1890 static struct pernet_operations ovs_net_ops = { 1891 .init = ovs_init_net, 1892 .exit = ovs_exit_net, 1893 .id = &ovs_net_id, 1894 .size = sizeof(struct ovs_net), 1895 }; 1896 1897 static int __init dp_init(void) 1898 { 1899 int err; 1900 1901 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); 1902 1903 pr_info("Open vSwitch switching datapath\n"); 1904 1905 err = ovs_flow_init(); 1906 if (err) 1907 goto error; 1908 1909 err = ovs_vport_init(); 1910 if (err) 1911 goto error_flow_exit; 1912 1913 err = register_pernet_device(&ovs_net_ops); 1914 if (err) 1915 goto error_vport_exit; 1916 1917 err = register_netdevice_notifier(&ovs_dp_device_notifier); 1918 if (err) 1919 goto error_netns_exit; 1920 1921 err = dp_register_genl(); 1922 if (err < 0) 1923 goto error_unreg_notifier; 1924 1925 return 0; 1926 1927 error_unreg_notifier: 1928 unregister_netdevice_notifier(&ovs_dp_device_notifier); 1929 error_netns_exit: 1930 unregister_pernet_device(&ovs_net_ops); 1931 error_vport_exit: 1932 ovs_vport_exit(); 1933 error_flow_exit: 1934 ovs_flow_exit(); 1935 error: 1936 return err; 1937 } 1938 1939 static void dp_cleanup(void) 1940 { 1941 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 1942 unregister_netdevice_notifier(&ovs_dp_device_notifier); 1943 unregister_pernet_device(&ovs_net_ops); 1944 rcu_barrier(); 1945 ovs_vport_exit(); 1946 ovs_flow_exit(); 1947 } 1948 1949 module_init(dp_init); 1950 module_exit(dp_cleanup); 1951 1952 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 1953 MODULE_LICENSE("GPL"); 1954