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