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 "meter.h" 59 #include "vport-internal_dev.h" 60 #include "vport-netdev.h" 61 62 unsigned int ovs_net_id __read_mostly; 63 64 static struct genl_family dp_packet_genl_family; 65 static struct genl_family dp_flow_genl_family; 66 static struct genl_family dp_datapath_genl_family; 67 68 static const struct nla_policy flow_policy[]; 69 70 static const struct genl_multicast_group ovs_dp_flow_multicast_group = { 71 .name = OVS_FLOW_MCGROUP, 72 }; 73 74 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = { 75 .name = OVS_DATAPATH_MCGROUP, 76 }; 77 78 static const struct genl_multicast_group ovs_dp_vport_multicast_group = { 79 .name = OVS_VPORT_MCGROUP, 80 }; 81 82 /* Check if need to build a reply message. 83 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */ 84 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info, 85 unsigned int group) 86 { 87 return info->nlhdr->nlmsg_flags & NLM_F_ECHO || 88 genl_has_listeners(family, genl_info_net(info), group); 89 } 90 91 static void ovs_notify(struct genl_family *family, 92 struct sk_buff *skb, struct genl_info *info) 93 { 94 genl_notify(family, skb, info, 0, GFP_KERNEL); 95 } 96 97 /** 98 * DOC: Locking: 99 * 100 * All writes e.g. Writes to device state (add/remove datapath, port, set 101 * operations on vports, etc.), Writes to other state (flow table 102 * modifications, set miscellaneous datapath parameters, etc.) are protected 103 * by ovs_lock. 104 * 105 * Reads are protected by RCU. 106 * 107 * There are a few special cases (mostly stats) that have their own 108 * synchronization but they nest under all of above and don't interact with 109 * each other. 110 * 111 * The RTNL lock nests inside ovs_mutex. 112 */ 113 114 static DEFINE_MUTEX(ovs_mutex); 115 116 void ovs_lock(void) 117 { 118 mutex_lock(&ovs_mutex); 119 } 120 121 void ovs_unlock(void) 122 { 123 mutex_unlock(&ovs_mutex); 124 } 125 126 #ifdef CONFIG_LOCKDEP 127 int lockdep_ovsl_is_held(void) 128 { 129 if (debug_locks) 130 return lockdep_is_held(&ovs_mutex); 131 else 132 return 1; 133 } 134 #endif 135 136 static struct vport *new_vport(const struct vport_parms *); 137 static int queue_gso_packets(struct datapath *dp, struct sk_buff *, 138 const struct sw_flow_key *, 139 const struct dp_upcall_info *, 140 uint32_t cutlen); 141 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *, 142 const struct sw_flow_key *, 143 const struct dp_upcall_info *, 144 uint32_t cutlen); 145 146 /* Must be called with rcu_read_lock or ovs_mutex. */ 147 const char *ovs_dp_name(const struct datapath *dp) 148 { 149 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); 150 return ovs_vport_name(vport); 151 } 152 153 static int get_dpifindex(const struct datapath *dp) 154 { 155 struct vport *local; 156 int ifindex; 157 158 rcu_read_lock(); 159 160 local = ovs_vport_rcu(dp, OVSP_LOCAL); 161 if (local) 162 ifindex = local->dev->ifindex; 163 else 164 ifindex = 0; 165 166 rcu_read_unlock(); 167 168 return ifindex; 169 } 170 171 static void destroy_dp_rcu(struct rcu_head *rcu) 172 { 173 struct datapath *dp = container_of(rcu, struct datapath, rcu); 174 175 ovs_flow_tbl_destroy(&dp->table); 176 free_percpu(dp->stats_percpu); 177 kfree(dp->ports); 178 ovs_meters_exit(dp); 179 kfree(dp); 180 } 181 182 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 183 u16 port_no) 184 { 185 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 186 } 187 188 /* Called with ovs_mutex or RCU read lock. */ 189 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 190 { 191 struct vport *vport; 192 struct hlist_head *head; 193 194 head = vport_hash_bucket(dp, port_no); 195 hlist_for_each_entry_rcu(vport, head, dp_hash_node) { 196 if (vport->port_no == port_no) 197 return vport; 198 } 199 return NULL; 200 } 201 202 /* Called with ovs_mutex. */ 203 static struct vport *new_vport(const struct vport_parms *parms) 204 { 205 struct vport *vport; 206 207 vport = ovs_vport_add(parms); 208 if (!IS_ERR(vport)) { 209 struct datapath *dp = parms->dp; 210 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 211 212 hlist_add_head_rcu(&vport->dp_hash_node, head); 213 } 214 return vport; 215 } 216 217 void ovs_dp_detach_port(struct vport *p) 218 { 219 ASSERT_OVSL(); 220 221 /* First drop references to device. */ 222 hlist_del_rcu(&p->dp_hash_node); 223 224 /* Then destroy it. */ 225 ovs_vport_del(p); 226 } 227 228 /* Must be called with rcu_read_lock. */ 229 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key) 230 { 231 const struct vport *p = OVS_CB(skb)->input_vport; 232 struct datapath *dp = p->dp; 233 struct sw_flow *flow; 234 struct sw_flow_actions *sf_acts; 235 struct dp_stats_percpu *stats; 236 u64 *stats_counter; 237 u32 n_mask_hit; 238 239 stats = this_cpu_ptr(dp->stats_percpu); 240 241 /* Look up flow. */ 242 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit); 243 if (unlikely(!flow)) { 244 struct dp_upcall_info upcall; 245 int error; 246 247 memset(&upcall, 0, sizeof(upcall)); 248 upcall.cmd = OVS_PACKET_CMD_MISS; 249 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 250 upcall.mru = OVS_CB(skb)->mru; 251 error = ovs_dp_upcall(dp, skb, key, &upcall, 0); 252 if (unlikely(error)) 253 kfree_skb(skb); 254 else 255 consume_skb(skb); 256 stats_counter = &stats->n_missed; 257 goto out; 258 } 259 260 ovs_flow_stats_update(flow, key->tp.flags, skb); 261 sf_acts = rcu_dereference(flow->sf_acts); 262 ovs_execute_actions(dp, skb, sf_acts, key); 263 264 stats_counter = &stats->n_hit; 265 266 out: 267 /* Update datapath statistics. */ 268 u64_stats_update_begin(&stats->syncp); 269 (*stats_counter)++; 270 stats->n_mask_hit += n_mask_hit; 271 u64_stats_update_end(&stats->syncp); 272 } 273 274 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 275 const struct sw_flow_key *key, 276 const struct dp_upcall_info *upcall_info, 277 uint32_t cutlen) 278 { 279 struct dp_stats_percpu *stats; 280 int err; 281 282 if (upcall_info->portid == 0) { 283 err = -ENOTCONN; 284 goto err; 285 } 286 287 if (!skb_is_gso(skb)) 288 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 289 else 290 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen); 291 if (err) 292 goto err; 293 294 return 0; 295 296 err: 297 stats = this_cpu_ptr(dp->stats_percpu); 298 299 u64_stats_update_begin(&stats->syncp); 300 stats->n_lost++; 301 u64_stats_update_end(&stats->syncp); 302 303 return err; 304 } 305 306 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 307 const struct sw_flow_key *key, 308 const struct dp_upcall_info *upcall_info, 309 uint32_t cutlen) 310 { 311 unsigned int gso_type = skb_shinfo(skb)->gso_type; 312 struct sw_flow_key later_key; 313 struct sk_buff *segs, *nskb; 314 int err; 315 316 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET); 317 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 318 if (IS_ERR(segs)) 319 return PTR_ERR(segs); 320 if (segs == NULL) 321 return -EINVAL; 322 323 if (gso_type & SKB_GSO_UDP) { 324 /* The initial flow key extracted by ovs_flow_key_extract() 325 * in this case is for a first fragment, so we need to 326 * properly mark later fragments. 327 */ 328 later_key = *key; 329 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 330 } 331 332 /* Queue all of the segments. */ 333 skb = segs; 334 do { 335 if (gso_type & SKB_GSO_UDP && skb != segs) 336 key = &later_key; 337 338 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 339 if (err) 340 break; 341 342 } while ((skb = skb->next)); 343 344 /* Free all of the segments. */ 345 skb = segs; 346 do { 347 nskb = skb->next; 348 if (err) 349 kfree_skb(skb); 350 else 351 consume_skb(skb); 352 } while ((skb = nskb)); 353 return err; 354 } 355 356 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, 357 unsigned int hdrlen, int actions_attrlen) 358 { 359 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 360 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 361 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */ 362 + nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */ 363 364 /* OVS_PACKET_ATTR_USERDATA */ 365 if (upcall_info->userdata) 366 size += NLA_ALIGN(upcall_info->userdata->nla_len); 367 368 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ 369 if (upcall_info->egress_tun_info) 370 size += nla_total_size(ovs_tun_key_attr_size()); 371 372 /* OVS_PACKET_ATTR_ACTIONS */ 373 if (upcall_info->actions_len) 374 size += nla_total_size(actions_attrlen); 375 376 /* OVS_PACKET_ATTR_MRU */ 377 if (upcall_info->mru) 378 size += nla_total_size(sizeof(upcall_info->mru)); 379 380 return size; 381 } 382 383 static void pad_packet(struct datapath *dp, struct sk_buff *skb) 384 { 385 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 386 size_t plen = NLA_ALIGN(skb->len) - skb->len; 387 388 if (plen > 0) 389 skb_put_zero(skb, plen); 390 } 391 } 392 393 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 394 const struct sw_flow_key *key, 395 const struct dp_upcall_info *upcall_info, 396 uint32_t cutlen) 397 { 398 struct ovs_header *upcall; 399 struct sk_buff *nskb = NULL; 400 struct sk_buff *user_skb = NULL; /* to be queued to userspace */ 401 struct nlattr *nla; 402 size_t len; 403 unsigned int hlen; 404 int err, dp_ifindex; 405 406 dp_ifindex = get_dpifindex(dp); 407 if (!dp_ifindex) 408 return -ENODEV; 409 410 if (skb_vlan_tag_present(skb)) { 411 nskb = skb_clone(skb, GFP_ATOMIC); 412 if (!nskb) 413 return -ENOMEM; 414 415 nskb = __vlan_hwaccel_push_inside(nskb); 416 if (!nskb) 417 return -ENOMEM; 418 419 skb = nskb; 420 } 421 422 if (nla_attr_size(skb->len) > USHRT_MAX) { 423 err = -EFBIG; 424 goto out; 425 } 426 427 /* Complete checksum if needed */ 428 if (skb->ip_summed == CHECKSUM_PARTIAL && 429 (err = skb_csum_hwoffload_help(skb, 0))) 430 goto out; 431 432 /* Older versions of OVS user space enforce alignment of the last 433 * Netlink attribute to NLA_ALIGNTO which would require extensive 434 * padding logic. Only perform zerocopy if padding is not required. 435 */ 436 if (dp->user_features & OVS_DP_F_UNALIGNED) 437 hlen = skb_zerocopy_headlen(skb); 438 else 439 hlen = skb->len; 440 441 len = upcall_msg_size(upcall_info, hlen - cutlen, 442 OVS_CB(skb)->acts_origlen); 443 user_skb = genlmsg_new(len, GFP_ATOMIC); 444 if (!user_skb) { 445 err = -ENOMEM; 446 goto out; 447 } 448 449 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 450 0, upcall_info->cmd); 451 upcall->dp_ifindex = dp_ifindex; 452 453 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); 454 BUG_ON(err); 455 456 if (upcall_info->userdata) 457 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 458 nla_len(upcall_info->userdata), 459 nla_data(upcall_info->userdata)); 460 461 if (upcall_info->egress_tun_info) { 462 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY); 463 err = ovs_nla_put_tunnel_info(user_skb, 464 upcall_info->egress_tun_info); 465 BUG_ON(err); 466 nla_nest_end(user_skb, nla); 467 } 468 469 if (upcall_info->actions_len) { 470 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS); 471 err = ovs_nla_put_actions(upcall_info->actions, 472 upcall_info->actions_len, 473 user_skb); 474 if (!err) 475 nla_nest_end(user_skb, nla); 476 else 477 nla_nest_cancel(user_skb, nla); 478 } 479 480 /* Add OVS_PACKET_ATTR_MRU */ 481 if (upcall_info->mru) { 482 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, 483 upcall_info->mru)) { 484 err = -ENOBUFS; 485 goto out; 486 } 487 pad_packet(dp, user_skb); 488 } 489 490 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */ 491 if (cutlen > 0) { 492 if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, 493 skb->len)) { 494 err = -ENOBUFS; 495 goto out; 496 } 497 pad_packet(dp, user_skb); 498 } 499 500 /* Only reserve room for attribute header, packet data is added 501 * in skb_zerocopy() */ 502 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 503 err = -ENOBUFS; 504 goto out; 505 } 506 nla->nla_len = nla_attr_size(skb->len - cutlen); 507 508 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen); 509 if (err) 510 goto out; 511 512 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 513 pad_packet(dp, user_skb); 514 515 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 516 517 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 518 user_skb = NULL; 519 out: 520 if (err) 521 skb_tx_error(skb); 522 kfree_skb(user_skb); 523 kfree_skb(nskb); 524 return err; 525 } 526 527 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 528 { 529 struct ovs_header *ovs_header = info->userhdr; 530 struct net *net = sock_net(skb->sk); 531 struct nlattr **a = info->attrs; 532 struct sw_flow_actions *acts; 533 struct sk_buff *packet; 534 struct sw_flow *flow; 535 struct sw_flow_actions *sf_acts; 536 struct datapath *dp; 537 struct vport *input_vport; 538 u16 mru = 0; 539 int len; 540 int err; 541 bool log = !a[OVS_PACKET_ATTR_PROBE]; 542 543 err = -EINVAL; 544 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 545 !a[OVS_PACKET_ATTR_ACTIONS]) 546 goto err; 547 548 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 549 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 550 err = -ENOMEM; 551 if (!packet) 552 goto err; 553 skb_reserve(packet, NET_IP_ALIGN); 554 555 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 556 557 /* Set packet's mru */ 558 if (a[OVS_PACKET_ATTR_MRU]) { 559 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]); 560 packet->ignore_df = 1; 561 } 562 OVS_CB(packet)->mru = mru; 563 564 /* Build an sw_flow for sending this packet. */ 565 flow = ovs_flow_alloc(); 566 err = PTR_ERR(flow); 567 if (IS_ERR(flow)) 568 goto err_kfree_skb; 569 570 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY], 571 packet, &flow->key, log); 572 if (err) 573 goto err_flow_free; 574 575 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS], 576 &flow->key, &acts, log); 577 if (err) 578 goto err_flow_free; 579 580 rcu_assign_pointer(flow->sf_acts, acts); 581 packet->priority = flow->key.phy.priority; 582 packet->mark = flow->key.phy.skb_mark; 583 584 rcu_read_lock(); 585 dp = get_dp_rcu(net, ovs_header->dp_ifindex); 586 err = -ENODEV; 587 if (!dp) 588 goto err_unlock; 589 590 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 591 if (!input_vport) 592 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 593 594 if (!input_vport) 595 goto err_unlock; 596 597 packet->dev = input_vport->dev; 598 OVS_CB(packet)->input_vport = input_vport; 599 sf_acts = rcu_dereference(flow->sf_acts); 600 601 local_bh_disable(); 602 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); 603 local_bh_enable(); 604 rcu_read_unlock(); 605 606 ovs_flow_free(flow, false); 607 return err; 608 609 err_unlock: 610 rcu_read_unlock(); 611 err_flow_free: 612 ovs_flow_free(flow, false); 613 err_kfree_skb: 614 kfree_skb(packet); 615 err: 616 return err; 617 } 618 619 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 620 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 621 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 622 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 623 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, 624 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, 625 }; 626 627 static const struct genl_ops dp_packet_genl_ops[] = { 628 { .cmd = OVS_PACKET_CMD_EXECUTE, 629 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 630 .policy = packet_policy, 631 .doit = ovs_packet_cmd_execute 632 } 633 }; 634 635 static struct genl_family dp_packet_genl_family __ro_after_init = { 636 .hdrsize = sizeof(struct ovs_header), 637 .name = OVS_PACKET_FAMILY, 638 .version = OVS_PACKET_VERSION, 639 .maxattr = OVS_PACKET_ATTR_MAX, 640 .netnsok = true, 641 .parallel_ops = true, 642 .ops = dp_packet_genl_ops, 643 .n_ops = ARRAY_SIZE(dp_packet_genl_ops), 644 .module = THIS_MODULE, 645 }; 646 647 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 648 struct ovs_dp_megaflow_stats *mega_stats) 649 { 650 int i; 651 652 memset(mega_stats, 0, sizeof(*mega_stats)); 653 654 stats->n_flows = ovs_flow_tbl_count(&dp->table); 655 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 656 657 stats->n_hit = stats->n_missed = stats->n_lost = 0; 658 659 for_each_possible_cpu(i) { 660 const struct dp_stats_percpu *percpu_stats; 661 struct dp_stats_percpu local_stats; 662 unsigned int start; 663 664 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 665 666 do { 667 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 668 local_stats = *percpu_stats; 669 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 670 671 stats->n_hit += local_stats.n_hit; 672 stats->n_missed += local_stats.n_missed; 673 stats->n_lost += local_stats.n_lost; 674 mega_stats->n_mask_hit += local_stats.n_mask_hit; 675 } 676 } 677 678 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) 679 { 680 return ovs_identifier_is_ufid(sfid) && 681 !(ufid_flags & OVS_UFID_F_OMIT_KEY); 682 } 683 684 static bool should_fill_mask(uint32_t ufid_flags) 685 { 686 return !(ufid_flags & OVS_UFID_F_OMIT_MASK); 687 } 688 689 static bool should_fill_actions(uint32_t ufid_flags) 690 { 691 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); 692 } 693 694 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, 695 const struct sw_flow_id *sfid, 696 uint32_t ufid_flags) 697 { 698 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); 699 700 /* OVS_FLOW_ATTR_UFID */ 701 if (sfid && ovs_identifier_is_ufid(sfid)) 702 len += nla_total_size(sfid->ufid_len); 703 704 /* OVS_FLOW_ATTR_KEY */ 705 if (!sfid || should_fill_key(sfid, ufid_flags)) 706 len += nla_total_size(ovs_key_attr_size()); 707 708 /* OVS_FLOW_ATTR_MASK */ 709 if (should_fill_mask(ufid_flags)) 710 len += nla_total_size(ovs_key_attr_size()); 711 712 /* OVS_FLOW_ATTR_ACTIONS */ 713 if (should_fill_actions(ufid_flags)) 714 len += nla_total_size(acts->orig_len); 715 716 return len 717 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 718 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 719 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */ 720 } 721 722 /* Called with ovs_mutex or RCU read lock. */ 723 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 724 struct sk_buff *skb) 725 { 726 struct ovs_flow_stats stats; 727 __be16 tcp_flags; 728 unsigned long used; 729 730 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 731 732 if (used && 733 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used), 734 OVS_FLOW_ATTR_PAD)) 735 return -EMSGSIZE; 736 737 if (stats.n_packets && 738 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS, 739 sizeof(struct ovs_flow_stats), &stats, 740 OVS_FLOW_ATTR_PAD)) 741 return -EMSGSIZE; 742 743 if ((u8)ntohs(tcp_flags) && 744 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 745 return -EMSGSIZE; 746 747 return 0; 748 } 749 750 /* Called with ovs_mutex or RCU read lock. */ 751 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 752 struct sk_buff *skb, int skb_orig_len) 753 { 754 struct nlattr *start; 755 int err; 756 757 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 758 * this is the first flow to be dumped into 'skb'. This is unusual for 759 * Netlink but individual action lists can be longer than 760 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 761 * The userspace caller can always fetch the actions separately if it 762 * really wants them. (Most userspace callers in fact don't care.) 763 * 764 * This can only fail for dump operations because the skb is always 765 * properly sized for single flows. 766 */ 767 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS); 768 if (start) { 769 const struct sw_flow_actions *sf_acts; 770 771 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 772 err = ovs_nla_put_actions(sf_acts->actions, 773 sf_acts->actions_len, skb); 774 775 if (!err) 776 nla_nest_end(skb, start); 777 else { 778 if (skb_orig_len) 779 return err; 780 781 nla_nest_cancel(skb, start); 782 } 783 } else if (skb_orig_len) { 784 return -EMSGSIZE; 785 } 786 787 return 0; 788 } 789 790 /* Called with ovs_mutex or RCU read lock. */ 791 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 792 struct sk_buff *skb, u32 portid, 793 u32 seq, u32 flags, u8 cmd, u32 ufid_flags) 794 { 795 const int skb_orig_len = skb->len; 796 struct ovs_header *ovs_header; 797 int err; 798 799 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 800 flags, cmd); 801 if (!ovs_header) 802 return -EMSGSIZE; 803 804 ovs_header->dp_ifindex = dp_ifindex; 805 806 err = ovs_nla_put_identifier(flow, skb); 807 if (err) 808 goto error; 809 810 if (should_fill_key(&flow->id, ufid_flags)) { 811 err = ovs_nla_put_masked_key(flow, skb); 812 if (err) 813 goto error; 814 } 815 816 if (should_fill_mask(ufid_flags)) { 817 err = ovs_nla_put_mask(flow, skb); 818 if (err) 819 goto error; 820 } 821 822 err = ovs_flow_cmd_fill_stats(flow, skb); 823 if (err) 824 goto error; 825 826 if (should_fill_actions(ufid_flags)) { 827 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 828 if (err) 829 goto error; 830 } 831 832 genlmsg_end(skb, ovs_header); 833 return 0; 834 835 error: 836 genlmsg_cancel(skb, ovs_header); 837 return err; 838 } 839 840 /* May not be called with RCU read lock. */ 841 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 842 const struct sw_flow_id *sfid, 843 struct genl_info *info, 844 bool always, 845 uint32_t ufid_flags) 846 { 847 struct sk_buff *skb; 848 size_t len; 849 850 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 851 return NULL; 852 853 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); 854 skb = genlmsg_new(len, GFP_KERNEL); 855 if (!skb) 856 return ERR_PTR(-ENOMEM); 857 858 return skb; 859 } 860 861 /* Called with ovs_mutex. */ 862 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 863 int dp_ifindex, 864 struct genl_info *info, u8 cmd, 865 bool always, u32 ufid_flags) 866 { 867 struct sk_buff *skb; 868 int retval; 869 870 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), 871 &flow->id, info, always, ufid_flags); 872 if (IS_ERR_OR_NULL(skb)) 873 return skb; 874 875 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 876 info->snd_portid, info->snd_seq, 0, 877 cmd, ufid_flags); 878 BUG_ON(retval < 0); 879 return skb; 880 } 881 882 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 883 { 884 struct net *net = sock_net(skb->sk); 885 struct nlattr **a = info->attrs; 886 struct ovs_header *ovs_header = info->userhdr; 887 struct sw_flow *flow = NULL, *new_flow; 888 struct sw_flow_mask mask; 889 struct sk_buff *reply; 890 struct datapath *dp; 891 struct sw_flow_actions *acts; 892 struct sw_flow_match match; 893 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 894 int error; 895 bool log = !a[OVS_FLOW_ATTR_PROBE]; 896 897 /* Must have key and actions. */ 898 error = -EINVAL; 899 if (!a[OVS_FLOW_ATTR_KEY]) { 900 OVS_NLERR(log, "Flow key attr not present in new flow."); 901 goto error; 902 } 903 if (!a[OVS_FLOW_ATTR_ACTIONS]) { 904 OVS_NLERR(log, "Flow actions attr not present in new flow."); 905 goto error; 906 } 907 908 /* Most of the time we need to allocate a new flow, do it before 909 * locking. 910 */ 911 new_flow = ovs_flow_alloc(); 912 if (IS_ERR(new_flow)) { 913 error = PTR_ERR(new_flow); 914 goto error; 915 } 916 917 /* Extract key. */ 918 ovs_match_init(&match, &new_flow->key, false, &mask); 919 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 920 a[OVS_FLOW_ATTR_MASK], log); 921 if (error) 922 goto err_kfree_flow; 923 924 /* Extract flow identifier. */ 925 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID], 926 &new_flow->key, log); 927 if (error) 928 goto err_kfree_flow; 929 930 /* unmasked key is needed to match when ufid is not used. */ 931 if (ovs_identifier_is_key(&new_flow->id)) 932 match.key = new_flow->id.unmasked_key; 933 934 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask); 935 936 /* Validate actions. */ 937 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS], 938 &new_flow->key, &acts, log); 939 if (error) { 940 OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); 941 goto err_kfree_flow; 942 } 943 944 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false, 945 ufid_flags); 946 if (IS_ERR(reply)) { 947 error = PTR_ERR(reply); 948 goto err_kfree_acts; 949 } 950 951 ovs_lock(); 952 dp = get_dp(net, ovs_header->dp_ifindex); 953 if (unlikely(!dp)) { 954 error = -ENODEV; 955 goto err_unlock_ovs; 956 } 957 958 /* Check if this is a duplicate flow */ 959 if (ovs_identifier_is_ufid(&new_flow->id)) 960 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id); 961 if (!flow) 962 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key); 963 if (likely(!flow)) { 964 rcu_assign_pointer(new_flow->sf_acts, acts); 965 966 /* Put flow in bucket. */ 967 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 968 if (unlikely(error)) { 969 acts = NULL; 970 goto err_unlock_ovs; 971 } 972 973 if (unlikely(reply)) { 974 error = ovs_flow_cmd_fill_info(new_flow, 975 ovs_header->dp_ifindex, 976 reply, info->snd_portid, 977 info->snd_seq, 0, 978 OVS_FLOW_CMD_NEW, 979 ufid_flags); 980 BUG_ON(error < 0); 981 } 982 ovs_unlock(); 983 } else { 984 struct sw_flow_actions *old_acts; 985 986 /* Bail out if we're not allowed to modify an existing flow. 987 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 988 * because Generic Netlink treats the latter as a dump 989 * request. We also accept NLM_F_EXCL in case that bug ever 990 * gets fixed. 991 */ 992 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 993 | NLM_F_EXCL))) { 994 error = -EEXIST; 995 goto err_unlock_ovs; 996 } 997 /* The flow identifier has to be the same for flow updates. 998 * Look for any overlapping flow. 999 */ 1000 if (unlikely(!ovs_flow_cmp(flow, &match))) { 1001 if (ovs_identifier_is_key(&flow->id)) 1002 flow = ovs_flow_tbl_lookup_exact(&dp->table, 1003 &match); 1004 else /* UFID matches but key is different */ 1005 flow = NULL; 1006 if (!flow) { 1007 error = -ENOENT; 1008 goto err_unlock_ovs; 1009 } 1010 } 1011 /* Update actions. */ 1012 old_acts = ovsl_dereference(flow->sf_acts); 1013 rcu_assign_pointer(flow->sf_acts, acts); 1014 1015 if (unlikely(reply)) { 1016 error = ovs_flow_cmd_fill_info(flow, 1017 ovs_header->dp_ifindex, 1018 reply, info->snd_portid, 1019 info->snd_seq, 0, 1020 OVS_FLOW_CMD_NEW, 1021 ufid_flags); 1022 BUG_ON(error < 0); 1023 } 1024 ovs_unlock(); 1025 1026 ovs_nla_free_flow_actions_rcu(old_acts); 1027 ovs_flow_free(new_flow, false); 1028 } 1029 1030 if (reply) 1031 ovs_notify(&dp_flow_genl_family, reply, info); 1032 return 0; 1033 1034 err_unlock_ovs: 1035 ovs_unlock(); 1036 kfree_skb(reply); 1037 err_kfree_acts: 1038 ovs_nla_free_flow_actions(acts); 1039 err_kfree_flow: 1040 ovs_flow_free(new_flow, false); 1041 error: 1042 return error; 1043 } 1044 1045 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ 1046 static struct sw_flow_actions *get_flow_actions(struct net *net, 1047 const struct nlattr *a, 1048 const struct sw_flow_key *key, 1049 const struct sw_flow_mask *mask, 1050 bool log) 1051 { 1052 struct sw_flow_actions *acts; 1053 struct sw_flow_key masked_key; 1054 int error; 1055 1056 ovs_flow_mask_key(&masked_key, key, true, mask); 1057 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log); 1058 if (error) { 1059 OVS_NLERR(log, 1060 "Actions may not be safe on all matching packets"); 1061 return ERR_PTR(error); 1062 } 1063 1064 return acts; 1065 } 1066 1067 /* Factor out match-init and action-copy to avoid 1068 * "Wframe-larger-than=1024" warning. Because mask is only 1069 * used to get actions, we new a function to save some 1070 * stack space. 1071 * 1072 * If there are not key and action attrs, we return 0 1073 * directly. In the case, the caller will also not use the 1074 * match as before. If there is action attr, we try to get 1075 * actions and save them to *acts. Before returning from 1076 * the function, we reset the match->mask pointer. Because 1077 * we should not to return match object with dangling reference 1078 * to mask. 1079 * */ 1080 static int ovs_nla_init_match_and_action(struct net *net, 1081 struct sw_flow_match *match, 1082 struct sw_flow_key *key, 1083 struct nlattr **a, 1084 struct sw_flow_actions **acts, 1085 bool log) 1086 { 1087 struct sw_flow_mask mask; 1088 int error = 0; 1089 1090 if (a[OVS_FLOW_ATTR_KEY]) { 1091 ovs_match_init(match, key, true, &mask); 1092 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY], 1093 a[OVS_FLOW_ATTR_MASK], log); 1094 if (error) 1095 goto error; 1096 } 1097 1098 if (a[OVS_FLOW_ATTR_ACTIONS]) { 1099 if (!a[OVS_FLOW_ATTR_KEY]) { 1100 OVS_NLERR(log, 1101 "Flow key attribute not present in set flow."); 1102 error = -EINVAL; 1103 goto error; 1104 } 1105 1106 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key, 1107 &mask, log); 1108 if (IS_ERR(*acts)) { 1109 error = PTR_ERR(*acts); 1110 goto error; 1111 } 1112 } 1113 1114 /* On success, error is 0. */ 1115 error: 1116 match->mask = NULL; 1117 return error; 1118 } 1119 1120 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 1121 { 1122 struct net *net = sock_net(skb->sk); 1123 struct nlattr **a = info->attrs; 1124 struct ovs_header *ovs_header = info->userhdr; 1125 struct sw_flow_key key; 1126 struct sw_flow *flow; 1127 struct sk_buff *reply = NULL; 1128 struct datapath *dp; 1129 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 1130 struct sw_flow_match match; 1131 struct sw_flow_id sfid; 1132 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1133 int error = 0; 1134 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1135 bool ufid_present; 1136 1137 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); 1138 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) { 1139 OVS_NLERR(log, 1140 "Flow set message rejected, Key attribute missing."); 1141 return -EINVAL; 1142 } 1143 1144 error = ovs_nla_init_match_and_action(net, &match, &key, a, 1145 &acts, log); 1146 if (error) 1147 goto error; 1148 1149 if (acts) { 1150 /* Can allocate before locking if have acts. */ 1151 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false, 1152 ufid_flags); 1153 if (IS_ERR(reply)) { 1154 error = PTR_ERR(reply); 1155 goto err_kfree_acts; 1156 } 1157 } 1158 1159 ovs_lock(); 1160 dp = get_dp(net, ovs_header->dp_ifindex); 1161 if (unlikely(!dp)) { 1162 error = -ENODEV; 1163 goto err_unlock_ovs; 1164 } 1165 /* Check that the flow exists. */ 1166 if (ufid_present) 1167 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid); 1168 else 1169 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1170 if (unlikely(!flow)) { 1171 error = -ENOENT; 1172 goto err_unlock_ovs; 1173 } 1174 1175 /* Update actions, if present. */ 1176 if (likely(acts)) { 1177 old_acts = ovsl_dereference(flow->sf_acts); 1178 rcu_assign_pointer(flow->sf_acts, acts); 1179 1180 if (unlikely(reply)) { 1181 error = ovs_flow_cmd_fill_info(flow, 1182 ovs_header->dp_ifindex, 1183 reply, info->snd_portid, 1184 info->snd_seq, 0, 1185 OVS_FLOW_CMD_SET, 1186 ufid_flags); 1187 BUG_ON(error < 0); 1188 } 1189 } else { 1190 /* Could not alloc without acts before locking. */ 1191 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1192 info, OVS_FLOW_CMD_SET, false, 1193 ufid_flags); 1194 1195 if (IS_ERR(reply)) { 1196 error = PTR_ERR(reply); 1197 goto err_unlock_ovs; 1198 } 1199 } 1200 1201 /* Clear stats. */ 1202 if (a[OVS_FLOW_ATTR_CLEAR]) 1203 ovs_flow_stats_clear(flow); 1204 ovs_unlock(); 1205 1206 if (reply) 1207 ovs_notify(&dp_flow_genl_family, reply, info); 1208 if (old_acts) 1209 ovs_nla_free_flow_actions_rcu(old_acts); 1210 1211 return 0; 1212 1213 err_unlock_ovs: 1214 ovs_unlock(); 1215 kfree_skb(reply); 1216 err_kfree_acts: 1217 ovs_nla_free_flow_actions(acts); 1218 error: 1219 return error; 1220 } 1221 1222 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1223 { 1224 struct nlattr **a = info->attrs; 1225 struct ovs_header *ovs_header = info->userhdr; 1226 struct net *net = sock_net(skb->sk); 1227 struct sw_flow_key key; 1228 struct sk_buff *reply; 1229 struct sw_flow *flow; 1230 struct datapath *dp; 1231 struct sw_flow_match match; 1232 struct sw_flow_id ufid; 1233 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1234 int err = 0; 1235 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1236 bool ufid_present; 1237 1238 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1239 if (a[OVS_FLOW_ATTR_KEY]) { 1240 ovs_match_init(&match, &key, true, NULL); 1241 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL, 1242 log); 1243 } else if (!ufid_present) { 1244 OVS_NLERR(log, 1245 "Flow get message rejected, Key attribute missing."); 1246 err = -EINVAL; 1247 } 1248 if (err) 1249 return err; 1250 1251 ovs_lock(); 1252 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1253 if (!dp) { 1254 err = -ENODEV; 1255 goto unlock; 1256 } 1257 1258 if (ufid_present) 1259 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1260 else 1261 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1262 if (!flow) { 1263 err = -ENOENT; 1264 goto unlock; 1265 } 1266 1267 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1268 OVS_FLOW_CMD_GET, true, ufid_flags); 1269 if (IS_ERR(reply)) { 1270 err = PTR_ERR(reply); 1271 goto unlock; 1272 } 1273 1274 ovs_unlock(); 1275 return genlmsg_reply(reply, info); 1276 unlock: 1277 ovs_unlock(); 1278 return err; 1279 } 1280 1281 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1282 { 1283 struct nlattr **a = info->attrs; 1284 struct ovs_header *ovs_header = info->userhdr; 1285 struct net *net = sock_net(skb->sk); 1286 struct sw_flow_key key; 1287 struct sk_buff *reply; 1288 struct sw_flow *flow = NULL; 1289 struct datapath *dp; 1290 struct sw_flow_match match; 1291 struct sw_flow_id ufid; 1292 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1293 int err; 1294 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1295 bool ufid_present; 1296 1297 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1298 if (a[OVS_FLOW_ATTR_KEY]) { 1299 ovs_match_init(&match, &key, true, NULL); 1300 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1301 NULL, log); 1302 if (unlikely(err)) 1303 return err; 1304 } 1305 1306 ovs_lock(); 1307 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1308 if (unlikely(!dp)) { 1309 err = -ENODEV; 1310 goto unlock; 1311 } 1312 1313 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) { 1314 err = ovs_flow_tbl_flush(&dp->table); 1315 goto unlock; 1316 } 1317 1318 if (ufid_present) 1319 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1320 else 1321 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1322 if (unlikely(!flow)) { 1323 err = -ENOENT; 1324 goto unlock; 1325 } 1326 1327 ovs_flow_tbl_remove(&dp->table, flow); 1328 ovs_unlock(); 1329 1330 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1331 &flow->id, info, false, ufid_flags); 1332 if (likely(reply)) { 1333 if (likely(!IS_ERR(reply))) { 1334 rcu_read_lock(); /*To keep RCU checker happy. */ 1335 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1336 reply, info->snd_portid, 1337 info->snd_seq, 0, 1338 OVS_FLOW_CMD_DEL, 1339 ufid_flags); 1340 rcu_read_unlock(); 1341 BUG_ON(err < 0); 1342 1343 ovs_notify(&dp_flow_genl_family, reply, info); 1344 } else { 1345 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply)); 1346 } 1347 } 1348 1349 ovs_flow_free(flow, true); 1350 return 0; 1351 unlock: 1352 ovs_unlock(); 1353 return err; 1354 } 1355 1356 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1357 { 1358 struct nlattr *a[__OVS_FLOW_ATTR_MAX]; 1359 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1360 struct table_instance *ti; 1361 struct datapath *dp; 1362 u32 ufid_flags; 1363 int err; 1364 1365 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a, 1366 OVS_FLOW_ATTR_MAX, flow_policy, NULL); 1367 if (err) 1368 return err; 1369 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1370 1371 rcu_read_lock(); 1372 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1373 if (!dp) { 1374 rcu_read_unlock(); 1375 return -ENODEV; 1376 } 1377 1378 ti = rcu_dereference(dp->table.ti); 1379 for (;;) { 1380 struct sw_flow *flow; 1381 u32 bucket, obj; 1382 1383 bucket = cb->args[0]; 1384 obj = cb->args[1]; 1385 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1386 if (!flow) 1387 break; 1388 1389 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1390 NETLINK_CB(cb->skb).portid, 1391 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1392 OVS_FLOW_CMD_GET, ufid_flags) < 0) 1393 break; 1394 1395 cb->args[0] = bucket; 1396 cb->args[1] = obj; 1397 } 1398 rcu_read_unlock(); 1399 return skb->len; 1400 } 1401 1402 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1403 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1404 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1405 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1406 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1407 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1408 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, 1409 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, 1410 }; 1411 1412 static const struct genl_ops dp_flow_genl_ops[] = { 1413 { .cmd = OVS_FLOW_CMD_NEW, 1414 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1415 .policy = flow_policy, 1416 .doit = ovs_flow_cmd_new 1417 }, 1418 { .cmd = OVS_FLOW_CMD_DEL, 1419 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1420 .policy = flow_policy, 1421 .doit = ovs_flow_cmd_del 1422 }, 1423 { .cmd = OVS_FLOW_CMD_GET, 1424 .flags = 0, /* OK for unprivileged users. */ 1425 .policy = flow_policy, 1426 .doit = ovs_flow_cmd_get, 1427 .dumpit = ovs_flow_cmd_dump 1428 }, 1429 { .cmd = OVS_FLOW_CMD_SET, 1430 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1431 .policy = flow_policy, 1432 .doit = ovs_flow_cmd_set, 1433 }, 1434 }; 1435 1436 static struct genl_family dp_flow_genl_family __ro_after_init = { 1437 .hdrsize = sizeof(struct ovs_header), 1438 .name = OVS_FLOW_FAMILY, 1439 .version = OVS_FLOW_VERSION, 1440 .maxattr = OVS_FLOW_ATTR_MAX, 1441 .netnsok = true, 1442 .parallel_ops = true, 1443 .ops = dp_flow_genl_ops, 1444 .n_ops = ARRAY_SIZE(dp_flow_genl_ops), 1445 .mcgrps = &ovs_dp_flow_multicast_group, 1446 .n_mcgrps = 1, 1447 .module = THIS_MODULE, 1448 }; 1449 1450 static size_t ovs_dp_cmd_msg_size(void) 1451 { 1452 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1453 1454 msgsize += nla_total_size(IFNAMSIZ); 1455 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats)); 1456 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats)); 1457 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1458 1459 return msgsize; 1460 } 1461 1462 /* Called with ovs_mutex. */ 1463 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1464 u32 portid, u32 seq, u32 flags, u8 cmd) 1465 { 1466 struct ovs_header *ovs_header; 1467 struct ovs_dp_stats dp_stats; 1468 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1469 int err; 1470 1471 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1472 flags, cmd); 1473 if (!ovs_header) 1474 goto error; 1475 1476 ovs_header->dp_ifindex = get_dpifindex(dp); 1477 1478 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1479 if (err) 1480 goto nla_put_failure; 1481 1482 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1483 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1484 &dp_stats, OVS_DP_ATTR_PAD)) 1485 goto nla_put_failure; 1486 1487 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1488 sizeof(struct ovs_dp_megaflow_stats), 1489 &dp_megaflow_stats, OVS_DP_ATTR_PAD)) 1490 goto nla_put_failure; 1491 1492 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1493 goto nla_put_failure; 1494 1495 genlmsg_end(skb, ovs_header); 1496 return 0; 1497 1498 nla_put_failure: 1499 genlmsg_cancel(skb, ovs_header); 1500 error: 1501 return -EMSGSIZE; 1502 } 1503 1504 static struct sk_buff *ovs_dp_cmd_alloc_info(void) 1505 { 1506 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL); 1507 } 1508 1509 /* Called with rcu_read_lock or ovs_mutex. */ 1510 static struct datapath *lookup_datapath(struct net *net, 1511 const struct ovs_header *ovs_header, 1512 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1513 { 1514 struct datapath *dp; 1515 1516 if (!a[OVS_DP_ATTR_NAME]) 1517 dp = get_dp(net, ovs_header->dp_ifindex); 1518 else { 1519 struct vport *vport; 1520 1521 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1522 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1523 } 1524 return dp ? dp : ERR_PTR(-ENODEV); 1525 } 1526 1527 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info) 1528 { 1529 struct datapath *dp; 1530 1531 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1532 if (IS_ERR(dp)) 1533 return; 1534 1535 WARN(dp->user_features, "Dropping previously announced user features\n"); 1536 dp->user_features = 0; 1537 } 1538 1539 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1540 { 1541 if (a[OVS_DP_ATTR_USER_FEATURES]) 1542 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1543 } 1544 1545 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1546 { 1547 struct nlattr **a = info->attrs; 1548 struct vport_parms parms; 1549 struct sk_buff *reply; 1550 struct datapath *dp; 1551 struct vport *vport; 1552 struct ovs_net *ovs_net; 1553 int err, i; 1554 1555 err = -EINVAL; 1556 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1557 goto err; 1558 1559 reply = ovs_dp_cmd_alloc_info(); 1560 if (!reply) 1561 return -ENOMEM; 1562 1563 err = -ENOMEM; 1564 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1565 if (dp == NULL) 1566 goto err_free_reply; 1567 1568 ovs_dp_set_net(dp, sock_net(skb->sk)); 1569 1570 /* Allocate table. */ 1571 err = ovs_flow_tbl_init(&dp->table); 1572 if (err) 1573 goto err_free_dp; 1574 1575 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1576 if (!dp->stats_percpu) { 1577 err = -ENOMEM; 1578 goto err_destroy_table; 1579 } 1580 1581 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS, 1582 sizeof(struct hlist_head), 1583 GFP_KERNEL); 1584 if (!dp->ports) { 1585 err = -ENOMEM; 1586 goto err_destroy_percpu; 1587 } 1588 1589 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1590 INIT_HLIST_HEAD(&dp->ports[i]); 1591 1592 err = ovs_meters_init(dp); 1593 if (err) 1594 goto err_destroy_ports_array; 1595 1596 /* Set up our datapath device. */ 1597 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1598 parms.type = OVS_VPORT_TYPE_INTERNAL; 1599 parms.options = NULL; 1600 parms.dp = dp; 1601 parms.port_no = OVSP_LOCAL; 1602 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1603 1604 ovs_dp_change(dp, a); 1605 1606 /* So far only local changes have been made, now need the lock. */ 1607 ovs_lock(); 1608 1609 vport = new_vport(&parms); 1610 if (IS_ERR(vport)) { 1611 err = PTR_ERR(vport); 1612 if (err == -EBUSY) 1613 err = -EEXIST; 1614 1615 if (err == -EEXIST) { 1616 /* An outdated user space instance that does not understand 1617 * the concept of user_features has attempted to create a new 1618 * datapath and is likely to reuse it. Drop all user features. 1619 */ 1620 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1621 ovs_dp_reset_user_features(skb, info); 1622 } 1623 1624 goto err_destroy_meters; 1625 } 1626 1627 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1628 info->snd_seq, 0, OVS_DP_CMD_NEW); 1629 BUG_ON(err < 0); 1630 1631 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1632 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1633 1634 ovs_unlock(); 1635 1636 ovs_notify(&dp_datapath_genl_family, reply, info); 1637 return 0; 1638 1639 err_destroy_meters: 1640 ovs_unlock(); 1641 ovs_meters_exit(dp); 1642 err_destroy_ports_array: 1643 kfree(dp->ports); 1644 err_destroy_percpu: 1645 free_percpu(dp->stats_percpu); 1646 err_destroy_table: 1647 ovs_flow_tbl_destroy(&dp->table); 1648 err_free_dp: 1649 kfree(dp); 1650 err_free_reply: 1651 kfree_skb(reply); 1652 err: 1653 return err; 1654 } 1655 1656 /* Called with ovs_mutex. */ 1657 static void __dp_destroy(struct datapath *dp) 1658 { 1659 int i; 1660 1661 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1662 struct vport *vport; 1663 struct hlist_node *n; 1664 1665 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1666 if (vport->port_no != OVSP_LOCAL) 1667 ovs_dp_detach_port(vport); 1668 } 1669 1670 list_del_rcu(&dp->list_node); 1671 1672 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1673 * all ports in datapath are destroyed first before freeing datapath. 1674 */ 1675 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1676 1677 /* RCU destroy the flow table */ 1678 call_rcu(&dp->rcu, destroy_dp_rcu); 1679 } 1680 1681 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1682 { 1683 struct sk_buff *reply; 1684 struct datapath *dp; 1685 int err; 1686 1687 reply = ovs_dp_cmd_alloc_info(); 1688 if (!reply) 1689 return -ENOMEM; 1690 1691 ovs_lock(); 1692 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1693 err = PTR_ERR(dp); 1694 if (IS_ERR(dp)) 1695 goto err_unlock_free; 1696 1697 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1698 info->snd_seq, 0, OVS_DP_CMD_DEL); 1699 BUG_ON(err < 0); 1700 1701 __dp_destroy(dp); 1702 ovs_unlock(); 1703 1704 ovs_notify(&dp_datapath_genl_family, reply, info); 1705 1706 return 0; 1707 1708 err_unlock_free: 1709 ovs_unlock(); 1710 kfree_skb(reply); 1711 return err; 1712 } 1713 1714 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1715 { 1716 struct sk_buff *reply; 1717 struct datapath *dp; 1718 int err; 1719 1720 reply = ovs_dp_cmd_alloc_info(); 1721 if (!reply) 1722 return -ENOMEM; 1723 1724 ovs_lock(); 1725 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1726 err = PTR_ERR(dp); 1727 if (IS_ERR(dp)) 1728 goto err_unlock_free; 1729 1730 ovs_dp_change(dp, info->attrs); 1731 1732 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1733 info->snd_seq, 0, OVS_DP_CMD_SET); 1734 BUG_ON(err < 0); 1735 1736 ovs_unlock(); 1737 ovs_notify(&dp_datapath_genl_family, reply, info); 1738 1739 return 0; 1740 1741 err_unlock_free: 1742 ovs_unlock(); 1743 kfree_skb(reply); 1744 return err; 1745 } 1746 1747 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1748 { 1749 struct sk_buff *reply; 1750 struct datapath *dp; 1751 int err; 1752 1753 reply = ovs_dp_cmd_alloc_info(); 1754 if (!reply) 1755 return -ENOMEM; 1756 1757 ovs_lock(); 1758 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1759 if (IS_ERR(dp)) { 1760 err = PTR_ERR(dp); 1761 goto err_unlock_free; 1762 } 1763 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1764 info->snd_seq, 0, OVS_DP_CMD_GET); 1765 BUG_ON(err < 0); 1766 ovs_unlock(); 1767 1768 return genlmsg_reply(reply, info); 1769 1770 err_unlock_free: 1771 ovs_unlock(); 1772 kfree_skb(reply); 1773 return err; 1774 } 1775 1776 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1777 { 1778 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1779 struct datapath *dp; 1780 int skip = cb->args[0]; 1781 int i = 0; 1782 1783 ovs_lock(); 1784 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1785 if (i >= skip && 1786 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1787 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1788 OVS_DP_CMD_GET) < 0) 1789 break; 1790 i++; 1791 } 1792 ovs_unlock(); 1793 1794 cb->args[0] = i; 1795 1796 return skb->len; 1797 } 1798 1799 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1800 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1801 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1802 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1803 }; 1804 1805 static const struct genl_ops dp_datapath_genl_ops[] = { 1806 { .cmd = OVS_DP_CMD_NEW, 1807 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1808 .policy = datapath_policy, 1809 .doit = ovs_dp_cmd_new 1810 }, 1811 { .cmd = OVS_DP_CMD_DEL, 1812 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1813 .policy = datapath_policy, 1814 .doit = ovs_dp_cmd_del 1815 }, 1816 { .cmd = OVS_DP_CMD_GET, 1817 .flags = 0, /* OK for unprivileged users. */ 1818 .policy = datapath_policy, 1819 .doit = ovs_dp_cmd_get, 1820 .dumpit = ovs_dp_cmd_dump 1821 }, 1822 { .cmd = OVS_DP_CMD_SET, 1823 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1824 .policy = datapath_policy, 1825 .doit = ovs_dp_cmd_set, 1826 }, 1827 }; 1828 1829 static struct genl_family dp_datapath_genl_family __ro_after_init = { 1830 .hdrsize = sizeof(struct ovs_header), 1831 .name = OVS_DATAPATH_FAMILY, 1832 .version = OVS_DATAPATH_VERSION, 1833 .maxattr = OVS_DP_ATTR_MAX, 1834 .netnsok = true, 1835 .parallel_ops = true, 1836 .ops = dp_datapath_genl_ops, 1837 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops), 1838 .mcgrps = &ovs_dp_datapath_multicast_group, 1839 .n_mcgrps = 1, 1840 .module = THIS_MODULE, 1841 }; 1842 1843 /* Called with ovs_mutex or RCU read lock. */ 1844 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1845 struct net *net, u32 portid, u32 seq, 1846 u32 flags, u8 cmd) 1847 { 1848 struct ovs_header *ovs_header; 1849 struct ovs_vport_stats vport_stats; 1850 int err; 1851 1852 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1853 flags, cmd); 1854 if (!ovs_header) 1855 return -EMSGSIZE; 1856 1857 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1858 1859 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1860 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1861 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 1862 ovs_vport_name(vport)) || 1863 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex)) 1864 goto nla_put_failure; 1865 1866 if (!net_eq(net, dev_net(vport->dev))) { 1867 int id = peernet2id_alloc(net, dev_net(vport->dev)); 1868 1869 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id)) 1870 goto nla_put_failure; 1871 } 1872 1873 ovs_vport_get_stats(vport, &vport_stats); 1874 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS, 1875 sizeof(struct ovs_vport_stats), &vport_stats, 1876 OVS_VPORT_ATTR_PAD)) 1877 goto nla_put_failure; 1878 1879 if (ovs_vport_get_upcall_portids(vport, skb)) 1880 goto nla_put_failure; 1881 1882 err = ovs_vport_get_options(vport, skb); 1883 if (err == -EMSGSIZE) 1884 goto error; 1885 1886 genlmsg_end(skb, ovs_header); 1887 return 0; 1888 1889 nla_put_failure: 1890 err = -EMSGSIZE; 1891 error: 1892 genlmsg_cancel(skb, ovs_header); 1893 return err; 1894 } 1895 1896 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 1897 { 1898 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1899 } 1900 1901 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 1902 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net, 1903 u32 portid, u32 seq, u8 cmd) 1904 { 1905 struct sk_buff *skb; 1906 int retval; 1907 1908 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1909 if (!skb) 1910 return ERR_PTR(-ENOMEM); 1911 1912 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd); 1913 BUG_ON(retval < 0); 1914 1915 return skb; 1916 } 1917 1918 /* Called with ovs_mutex or RCU read lock. */ 1919 static struct vport *lookup_vport(struct net *net, 1920 const struct ovs_header *ovs_header, 1921 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1922 { 1923 struct datapath *dp; 1924 struct vport *vport; 1925 1926 if (a[OVS_VPORT_ATTR_IFINDEX]) 1927 return ERR_PTR(-EOPNOTSUPP); 1928 if (a[OVS_VPORT_ATTR_NAME]) { 1929 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 1930 if (!vport) 1931 return ERR_PTR(-ENODEV); 1932 if (ovs_header->dp_ifindex && 1933 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 1934 return ERR_PTR(-ENODEV); 1935 return vport; 1936 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 1937 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1938 1939 if (port_no >= DP_MAX_PORTS) 1940 return ERR_PTR(-EFBIG); 1941 1942 dp = get_dp(net, ovs_header->dp_ifindex); 1943 if (!dp) 1944 return ERR_PTR(-ENODEV); 1945 1946 vport = ovs_vport_ovsl_rcu(dp, port_no); 1947 if (!vport) 1948 return ERR_PTR(-ENODEV); 1949 return vport; 1950 } else 1951 return ERR_PTR(-EINVAL); 1952 1953 } 1954 1955 /* Called with ovs_mutex */ 1956 static void update_headroom(struct datapath *dp) 1957 { 1958 unsigned dev_headroom, max_headroom = 0; 1959 struct net_device *dev; 1960 struct vport *vport; 1961 int i; 1962 1963 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1964 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 1965 dev = vport->dev; 1966 dev_headroom = netdev_get_fwd_headroom(dev); 1967 if (dev_headroom > max_headroom) 1968 max_headroom = dev_headroom; 1969 } 1970 } 1971 1972 dp->max_headroom = max_headroom; 1973 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1974 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) 1975 netdev_set_rx_headroom(vport->dev, max_headroom); 1976 } 1977 1978 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 1979 { 1980 struct nlattr **a = info->attrs; 1981 struct ovs_header *ovs_header = info->userhdr; 1982 struct vport_parms parms; 1983 struct sk_buff *reply; 1984 struct vport *vport; 1985 struct datapath *dp; 1986 u32 port_no; 1987 int err; 1988 1989 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 1990 !a[OVS_VPORT_ATTR_UPCALL_PID]) 1991 return -EINVAL; 1992 if (a[OVS_VPORT_ATTR_IFINDEX]) 1993 return -EOPNOTSUPP; 1994 1995 port_no = a[OVS_VPORT_ATTR_PORT_NO] 1996 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 1997 if (port_no >= DP_MAX_PORTS) 1998 return -EFBIG; 1999 2000 reply = ovs_vport_cmd_alloc_info(); 2001 if (!reply) 2002 return -ENOMEM; 2003 2004 ovs_lock(); 2005 restart: 2006 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 2007 err = -ENODEV; 2008 if (!dp) 2009 goto exit_unlock_free; 2010 2011 if (port_no) { 2012 vport = ovs_vport_ovsl(dp, port_no); 2013 err = -EBUSY; 2014 if (vport) 2015 goto exit_unlock_free; 2016 } else { 2017 for (port_no = 1; ; port_no++) { 2018 if (port_no >= DP_MAX_PORTS) { 2019 err = -EFBIG; 2020 goto exit_unlock_free; 2021 } 2022 vport = ovs_vport_ovsl(dp, port_no); 2023 if (!vport) 2024 break; 2025 } 2026 } 2027 2028 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 2029 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 2030 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 2031 parms.dp = dp; 2032 parms.port_no = port_no; 2033 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2034 2035 vport = new_vport(&parms); 2036 err = PTR_ERR(vport); 2037 if (IS_ERR(vport)) { 2038 if (err == -EAGAIN) 2039 goto restart; 2040 goto exit_unlock_free; 2041 } 2042 2043 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2044 info->snd_portid, info->snd_seq, 0, 2045 OVS_VPORT_CMD_NEW); 2046 2047 if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom) 2048 update_headroom(dp); 2049 else 2050 netdev_set_rx_headroom(vport->dev, dp->max_headroom); 2051 2052 BUG_ON(err < 0); 2053 ovs_unlock(); 2054 2055 ovs_notify(&dp_vport_genl_family, reply, info); 2056 return 0; 2057 2058 exit_unlock_free: 2059 ovs_unlock(); 2060 kfree_skb(reply); 2061 return err; 2062 } 2063 2064 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 2065 { 2066 struct nlattr **a = info->attrs; 2067 struct sk_buff *reply; 2068 struct vport *vport; 2069 int err; 2070 2071 reply = ovs_vport_cmd_alloc_info(); 2072 if (!reply) 2073 return -ENOMEM; 2074 2075 ovs_lock(); 2076 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2077 err = PTR_ERR(vport); 2078 if (IS_ERR(vport)) 2079 goto exit_unlock_free; 2080 2081 if (a[OVS_VPORT_ATTR_TYPE] && 2082 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 2083 err = -EINVAL; 2084 goto exit_unlock_free; 2085 } 2086 2087 if (a[OVS_VPORT_ATTR_OPTIONS]) { 2088 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 2089 if (err) 2090 goto exit_unlock_free; 2091 } 2092 2093 2094 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 2095 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2096 2097 err = ovs_vport_set_upcall_portids(vport, ids); 2098 if (err) 2099 goto exit_unlock_free; 2100 } 2101 2102 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2103 info->snd_portid, info->snd_seq, 0, 2104 OVS_VPORT_CMD_SET); 2105 BUG_ON(err < 0); 2106 2107 ovs_unlock(); 2108 ovs_notify(&dp_vport_genl_family, reply, info); 2109 return 0; 2110 2111 exit_unlock_free: 2112 ovs_unlock(); 2113 kfree_skb(reply); 2114 return err; 2115 } 2116 2117 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2118 { 2119 bool must_update_headroom = false; 2120 struct nlattr **a = info->attrs; 2121 struct sk_buff *reply; 2122 struct datapath *dp; 2123 struct vport *vport; 2124 int err; 2125 2126 reply = ovs_vport_cmd_alloc_info(); 2127 if (!reply) 2128 return -ENOMEM; 2129 2130 ovs_lock(); 2131 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2132 err = PTR_ERR(vport); 2133 if (IS_ERR(vport)) 2134 goto exit_unlock_free; 2135 2136 if (vport->port_no == OVSP_LOCAL) { 2137 err = -EINVAL; 2138 goto exit_unlock_free; 2139 } 2140 2141 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2142 info->snd_portid, info->snd_seq, 0, 2143 OVS_VPORT_CMD_DEL); 2144 BUG_ON(err < 0); 2145 2146 /* the vport deletion may trigger dp headroom update */ 2147 dp = vport->dp; 2148 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom) 2149 must_update_headroom = true; 2150 netdev_reset_rx_headroom(vport->dev); 2151 ovs_dp_detach_port(vport); 2152 2153 if (must_update_headroom) 2154 update_headroom(dp); 2155 ovs_unlock(); 2156 2157 ovs_notify(&dp_vport_genl_family, reply, info); 2158 return 0; 2159 2160 exit_unlock_free: 2161 ovs_unlock(); 2162 kfree_skb(reply); 2163 return err; 2164 } 2165 2166 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2167 { 2168 struct nlattr **a = info->attrs; 2169 struct ovs_header *ovs_header = info->userhdr; 2170 struct sk_buff *reply; 2171 struct vport *vport; 2172 int err; 2173 2174 reply = ovs_vport_cmd_alloc_info(); 2175 if (!reply) 2176 return -ENOMEM; 2177 2178 rcu_read_lock(); 2179 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2180 err = PTR_ERR(vport); 2181 if (IS_ERR(vport)) 2182 goto exit_unlock_free; 2183 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2184 info->snd_portid, info->snd_seq, 0, 2185 OVS_VPORT_CMD_GET); 2186 BUG_ON(err < 0); 2187 rcu_read_unlock(); 2188 2189 return genlmsg_reply(reply, info); 2190 2191 exit_unlock_free: 2192 rcu_read_unlock(); 2193 kfree_skb(reply); 2194 return err; 2195 } 2196 2197 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2198 { 2199 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2200 struct datapath *dp; 2201 int bucket = cb->args[0], skip = cb->args[1]; 2202 int i, j = 0; 2203 2204 rcu_read_lock(); 2205 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2206 if (!dp) { 2207 rcu_read_unlock(); 2208 return -ENODEV; 2209 } 2210 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2211 struct vport *vport; 2212 2213 j = 0; 2214 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2215 if (j >= skip && 2216 ovs_vport_cmd_fill_info(vport, skb, 2217 sock_net(skb->sk), 2218 NETLINK_CB(cb->skb).portid, 2219 cb->nlh->nlmsg_seq, 2220 NLM_F_MULTI, 2221 OVS_VPORT_CMD_GET) < 0) 2222 goto out; 2223 2224 j++; 2225 } 2226 skip = 0; 2227 } 2228 out: 2229 rcu_read_unlock(); 2230 2231 cb->args[0] = i; 2232 cb->args[1] = j; 2233 2234 return skb->len; 2235 } 2236 2237 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2238 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2239 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2240 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2241 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2242 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 2243 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2244 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 }, 2245 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 }, 2246 }; 2247 2248 static const struct genl_ops dp_vport_genl_ops[] = { 2249 { .cmd = OVS_VPORT_CMD_NEW, 2250 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2251 .policy = vport_policy, 2252 .doit = ovs_vport_cmd_new 2253 }, 2254 { .cmd = OVS_VPORT_CMD_DEL, 2255 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2256 .policy = vport_policy, 2257 .doit = ovs_vport_cmd_del 2258 }, 2259 { .cmd = OVS_VPORT_CMD_GET, 2260 .flags = 0, /* OK for unprivileged users. */ 2261 .policy = vport_policy, 2262 .doit = ovs_vport_cmd_get, 2263 .dumpit = ovs_vport_cmd_dump 2264 }, 2265 { .cmd = OVS_VPORT_CMD_SET, 2266 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2267 .policy = vport_policy, 2268 .doit = ovs_vport_cmd_set, 2269 }, 2270 }; 2271 2272 struct genl_family dp_vport_genl_family __ro_after_init = { 2273 .hdrsize = sizeof(struct ovs_header), 2274 .name = OVS_VPORT_FAMILY, 2275 .version = OVS_VPORT_VERSION, 2276 .maxattr = OVS_VPORT_ATTR_MAX, 2277 .netnsok = true, 2278 .parallel_ops = true, 2279 .ops = dp_vport_genl_ops, 2280 .n_ops = ARRAY_SIZE(dp_vport_genl_ops), 2281 .mcgrps = &ovs_dp_vport_multicast_group, 2282 .n_mcgrps = 1, 2283 .module = THIS_MODULE, 2284 }; 2285 2286 static struct genl_family * const dp_genl_families[] = { 2287 &dp_datapath_genl_family, 2288 &dp_vport_genl_family, 2289 &dp_flow_genl_family, 2290 &dp_packet_genl_family, 2291 &dp_meter_genl_family, 2292 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 2293 &dp_ct_limit_genl_family, 2294 #endif 2295 }; 2296 2297 static void dp_unregister_genl(int n_families) 2298 { 2299 int i; 2300 2301 for (i = 0; i < n_families; i++) 2302 genl_unregister_family(dp_genl_families[i]); 2303 } 2304 2305 static int __init dp_register_genl(void) 2306 { 2307 int err; 2308 int i; 2309 2310 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2311 2312 err = genl_register_family(dp_genl_families[i]); 2313 if (err) 2314 goto error; 2315 } 2316 2317 return 0; 2318 2319 error: 2320 dp_unregister_genl(i); 2321 return err; 2322 } 2323 2324 static int __net_init ovs_init_net(struct net *net) 2325 { 2326 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2327 2328 INIT_LIST_HEAD(&ovs_net->dps); 2329 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2330 return ovs_ct_init(net); 2331 } 2332 2333 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2334 struct list_head *head) 2335 { 2336 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2337 struct datapath *dp; 2338 2339 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2340 int i; 2341 2342 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2343 struct vport *vport; 2344 2345 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2346 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2347 continue; 2348 2349 if (dev_net(vport->dev) == dnet) 2350 list_add(&vport->detach_list, head); 2351 } 2352 } 2353 } 2354 } 2355 2356 static void __net_exit ovs_exit_net(struct net *dnet) 2357 { 2358 struct datapath *dp, *dp_next; 2359 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2360 struct vport *vport, *vport_next; 2361 struct net *net; 2362 LIST_HEAD(head); 2363 2364 ovs_ct_exit(dnet); 2365 ovs_lock(); 2366 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2367 __dp_destroy(dp); 2368 2369 down_read(&net_rwsem); 2370 for_each_net(net) 2371 list_vports_from_net(net, dnet, &head); 2372 up_read(&net_rwsem); 2373 2374 /* Detach all vports from given namespace. */ 2375 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2376 list_del(&vport->detach_list); 2377 ovs_dp_detach_port(vport); 2378 } 2379 2380 ovs_unlock(); 2381 2382 cancel_work_sync(&ovs_net->dp_notify_work); 2383 } 2384 2385 static struct pernet_operations ovs_net_ops = { 2386 .init = ovs_init_net, 2387 .exit = ovs_exit_net, 2388 .id = &ovs_net_id, 2389 .size = sizeof(struct ovs_net), 2390 }; 2391 2392 static int __init dp_init(void) 2393 { 2394 int err; 2395 2396 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); 2397 2398 pr_info("Open vSwitch switching datapath\n"); 2399 2400 err = action_fifos_init(); 2401 if (err) 2402 goto error; 2403 2404 err = ovs_internal_dev_rtnl_link_register(); 2405 if (err) 2406 goto error_action_fifos_exit; 2407 2408 err = ovs_flow_init(); 2409 if (err) 2410 goto error_unreg_rtnl_link; 2411 2412 err = ovs_vport_init(); 2413 if (err) 2414 goto error_flow_exit; 2415 2416 err = register_pernet_device(&ovs_net_ops); 2417 if (err) 2418 goto error_vport_exit; 2419 2420 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2421 if (err) 2422 goto error_netns_exit; 2423 2424 err = ovs_netdev_init(); 2425 if (err) 2426 goto error_unreg_notifier; 2427 2428 err = dp_register_genl(); 2429 if (err < 0) 2430 goto error_unreg_netdev; 2431 2432 return 0; 2433 2434 error_unreg_netdev: 2435 ovs_netdev_exit(); 2436 error_unreg_notifier: 2437 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2438 error_netns_exit: 2439 unregister_pernet_device(&ovs_net_ops); 2440 error_vport_exit: 2441 ovs_vport_exit(); 2442 error_flow_exit: 2443 ovs_flow_exit(); 2444 error_unreg_rtnl_link: 2445 ovs_internal_dev_rtnl_link_unregister(); 2446 error_action_fifos_exit: 2447 action_fifos_exit(); 2448 error: 2449 return err; 2450 } 2451 2452 static void dp_cleanup(void) 2453 { 2454 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2455 ovs_netdev_exit(); 2456 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2457 unregister_pernet_device(&ovs_net_ops); 2458 rcu_barrier(); 2459 ovs_vport_exit(); 2460 ovs_flow_exit(); 2461 ovs_internal_dev_rtnl_link_unregister(); 2462 action_fifos_exit(); 2463 } 2464 2465 module_init(dp_init); 2466 module_exit(dp_cleanup); 2467 2468 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2469 MODULE_LICENSE("GPL"); 2470 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY); 2471 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY); 2472 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY); 2473 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY); 2474 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY); 2475 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY); 2476