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 if (!upcall) { 452 err = -EINVAL; 453 goto out; 454 } 455 upcall->dp_ifindex = dp_ifindex; 456 457 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); 458 if (err) 459 goto out; 460 461 if (upcall_info->userdata) 462 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 463 nla_len(upcall_info->userdata), 464 nla_data(upcall_info->userdata)); 465 466 if (upcall_info->egress_tun_info) { 467 nla = nla_nest_start_noflag(user_skb, 468 OVS_PACKET_ATTR_EGRESS_TUN_KEY); 469 if (!nla) { 470 err = -EMSGSIZE; 471 goto out; 472 } 473 err = ovs_nla_put_tunnel_info(user_skb, 474 upcall_info->egress_tun_info); 475 if (err) 476 goto out; 477 478 nla_nest_end(user_skb, nla); 479 } 480 481 if (upcall_info->actions_len) { 482 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS); 483 if (!nla) { 484 err = -EMSGSIZE; 485 goto out; 486 } 487 err = ovs_nla_put_actions(upcall_info->actions, 488 upcall_info->actions_len, 489 user_skb); 490 if (!err) 491 nla_nest_end(user_skb, nla); 492 else 493 nla_nest_cancel(user_skb, nla); 494 } 495 496 /* Add OVS_PACKET_ATTR_MRU */ 497 if (upcall_info->mru) { 498 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, 499 upcall_info->mru)) { 500 err = -ENOBUFS; 501 goto out; 502 } 503 pad_packet(dp, user_skb); 504 } 505 506 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */ 507 if (cutlen > 0) { 508 if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, 509 skb->len)) { 510 err = -ENOBUFS; 511 goto out; 512 } 513 pad_packet(dp, user_skb); 514 } 515 516 /* Only reserve room for attribute header, packet data is added 517 * in skb_zerocopy() */ 518 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 519 err = -ENOBUFS; 520 goto out; 521 } 522 nla->nla_len = nla_attr_size(skb->len - cutlen); 523 524 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen); 525 if (err) 526 goto out; 527 528 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 529 pad_packet(dp, user_skb); 530 531 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 532 533 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 534 user_skb = NULL; 535 out: 536 if (err) 537 skb_tx_error(skb); 538 kfree_skb(user_skb); 539 kfree_skb(nskb); 540 return err; 541 } 542 543 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 544 { 545 struct ovs_header *ovs_header = info->userhdr; 546 struct net *net = sock_net(skb->sk); 547 struct nlattr **a = info->attrs; 548 struct sw_flow_actions *acts; 549 struct sk_buff *packet; 550 struct sw_flow *flow; 551 struct sw_flow_actions *sf_acts; 552 struct datapath *dp; 553 struct vport *input_vport; 554 u16 mru = 0; 555 int len; 556 int err; 557 bool log = !a[OVS_PACKET_ATTR_PROBE]; 558 559 err = -EINVAL; 560 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 561 !a[OVS_PACKET_ATTR_ACTIONS]) 562 goto err; 563 564 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 565 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 566 err = -ENOMEM; 567 if (!packet) 568 goto err; 569 skb_reserve(packet, NET_IP_ALIGN); 570 571 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 572 573 /* Set packet's mru */ 574 if (a[OVS_PACKET_ATTR_MRU]) { 575 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]); 576 packet->ignore_df = 1; 577 } 578 OVS_CB(packet)->mru = mru; 579 580 /* Build an sw_flow for sending this packet. */ 581 flow = ovs_flow_alloc(); 582 err = PTR_ERR(flow); 583 if (IS_ERR(flow)) 584 goto err_kfree_skb; 585 586 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY], 587 packet, &flow->key, log); 588 if (err) 589 goto err_flow_free; 590 591 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS], 592 &flow->key, &acts, log); 593 if (err) 594 goto err_flow_free; 595 596 rcu_assign_pointer(flow->sf_acts, acts); 597 packet->priority = flow->key.phy.priority; 598 packet->mark = flow->key.phy.skb_mark; 599 600 rcu_read_lock(); 601 dp = get_dp_rcu(net, ovs_header->dp_ifindex); 602 err = -ENODEV; 603 if (!dp) 604 goto err_unlock; 605 606 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 607 if (!input_vport) 608 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 609 610 if (!input_vport) 611 goto err_unlock; 612 613 packet->dev = input_vport->dev; 614 OVS_CB(packet)->input_vport = input_vport; 615 sf_acts = rcu_dereference(flow->sf_acts); 616 617 local_bh_disable(); 618 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); 619 local_bh_enable(); 620 rcu_read_unlock(); 621 622 ovs_flow_free(flow, false); 623 return err; 624 625 err_unlock: 626 rcu_read_unlock(); 627 err_flow_free: 628 ovs_flow_free(flow, false); 629 err_kfree_skb: 630 kfree_skb(packet); 631 err: 632 return err; 633 } 634 635 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 636 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 637 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 638 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 639 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, 640 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, 641 }; 642 643 static const struct genl_ops dp_packet_genl_ops[] = { 644 { .cmd = OVS_PACKET_CMD_EXECUTE, 645 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 646 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 647 .doit = ovs_packet_cmd_execute 648 } 649 }; 650 651 static struct genl_family dp_packet_genl_family __ro_after_init = { 652 .hdrsize = sizeof(struct ovs_header), 653 .name = OVS_PACKET_FAMILY, 654 .version = OVS_PACKET_VERSION, 655 .maxattr = OVS_PACKET_ATTR_MAX, 656 .policy = packet_policy, 657 .netnsok = true, 658 .parallel_ops = true, 659 .ops = dp_packet_genl_ops, 660 .n_ops = ARRAY_SIZE(dp_packet_genl_ops), 661 .module = THIS_MODULE, 662 }; 663 664 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 665 struct ovs_dp_megaflow_stats *mega_stats) 666 { 667 int i; 668 669 memset(mega_stats, 0, sizeof(*mega_stats)); 670 671 stats->n_flows = ovs_flow_tbl_count(&dp->table); 672 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 673 674 stats->n_hit = stats->n_missed = stats->n_lost = 0; 675 676 for_each_possible_cpu(i) { 677 const struct dp_stats_percpu *percpu_stats; 678 struct dp_stats_percpu local_stats; 679 unsigned int start; 680 681 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 682 683 do { 684 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 685 local_stats = *percpu_stats; 686 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 687 688 stats->n_hit += local_stats.n_hit; 689 stats->n_missed += local_stats.n_missed; 690 stats->n_lost += local_stats.n_lost; 691 mega_stats->n_mask_hit += local_stats.n_mask_hit; 692 } 693 } 694 695 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) 696 { 697 return ovs_identifier_is_ufid(sfid) && 698 !(ufid_flags & OVS_UFID_F_OMIT_KEY); 699 } 700 701 static bool should_fill_mask(uint32_t ufid_flags) 702 { 703 return !(ufid_flags & OVS_UFID_F_OMIT_MASK); 704 } 705 706 static bool should_fill_actions(uint32_t ufid_flags) 707 { 708 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); 709 } 710 711 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, 712 const struct sw_flow_id *sfid, 713 uint32_t ufid_flags) 714 { 715 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); 716 717 /* OVS_FLOW_ATTR_UFID */ 718 if (sfid && ovs_identifier_is_ufid(sfid)) 719 len += nla_total_size(sfid->ufid_len); 720 721 /* OVS_FLOW_ATTR_KEY */ 722 if (!sfid || should_fill_key(sfid, ufid_flags)) 723 len += nla_total_size(ovs_key_attr_size()); 724 725 /* OVS_FLOW_ATTR_MASK */ 726 if (should_fill_mask(ufid_flags)) 727 len += nla_total_size(ovs_key_attr_size()); 728 729 /* OVS_FLOW_ATTR_ACTIONS */ 730 if (should_fill_actions(ufid_flags)) 731 len += nla_total_size(acts->orig_len); 732 733 return len 734 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 735 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 736 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */ 737 } 738 739 /* Called with ovs_mutex or RCU read lock. */ 740 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 741 struct sk_buff *skb) 742 { 743 struct ovs_flow_stats stats; 744 __be16 tcp_flags; 745 unsigned long used; 746 747 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 748 749 if (used && 750 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used), 751 OVS_FLOW_ATTR_PAD)) 752 return -EMSGSIZE; 753 754 if (stats.n_packets && 755 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS, 756 sizeof(struct ovs_flow_stats), &stats, 757 OVS_FLOW_ATTR_PAD)) 758 return -EMSGSIZE; 759 760 if ((u8)ntohs(tcp_flags) && 761 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 762 return -EMSGSIZE; 763 764 return 0; 765 } 766 767 /* Called with ovs_mutex or RCU read lock. */ 768 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 769 struct sk_buff *skb, int skb_orig_len) 770 { 771 struct nlattr *start; 772 int err; 773 774 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 775 * this is the first flow to be dumped into 'skb'. This is unusual for 776 * Netlink but individual action lists can be longer than 777 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 778 * The userspace caller can always fetch the actions separately if it 779 * really wants them. (Most userspace callers in fact don't care.) 780 * 781 * This can only fail for dump operations because the skb is always 782 * properly sized for single flows. 783 */ 784 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS); 785 if (start) { 786 const struct sw_flow_actions *sf_acts; 787 788 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 789 err = ovs_nla_put_actions(sf_acts->actions, 790 sf_acts->actions_len, skb); 791 792 if (!err) 793 nla_nest_end(skb, start); 794 else { 795 if (skb_orig_len) 796 return err; 797 798 nla_nest_cancel(skb, start); 799 } 800 } else if (skb_orig_len) { 801 return -EMSGSIZE; 802 } 803 804 return 0; 805 } 806 807 /* Called with ovs_mutex or RCU read lock. */ 808 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 809 struct sk_buff *skb, u32 portid, 810 u32 seq, u32 flags, u8 cmd, u32 ufid_flags) 811 { 812 const int skb_orig_len = skb->len; 813 struct ovs_header *ovs_header; 814 int err; 815 816 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 817 flags, cmd); 818 if (!ovs_header) 819 return -EMSGSIZE; 820 821 ovs_header->dp_ifindex = dp_ifindex; 822 823 err = ovs_nla_put_identifier(flow, skb); 824 if (err) 825 goto error; 826 827 if (should_fill_key(&flow->id, ufid_flags)) { 828 err = ovs_nla_put_masked_key(flow, skb); 829 if (err) 830 goto error; 831 } 832 833 if (should_fill_mask(ufid_flags)) { 834 err = ovs_nla_put_mask(flow, skb); 835 if (err) 836 goto error; 837 } 838 839 err = ovs_flow_cmd_fill_stats(flow, skb); 840 if (err) 841 goto error; 842 843 if (should_fill_actions(ufid_flags)) { 844 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 845 if (err) 846 goto error; 847 } 848 849 genlmsg_end(skb, ovs_header); 850 return 0; 851 852 error: 853 genlmsg_cancel(skb, ovs_header); 854 return err; 855 } 856 857 /* May not be called with RCU read lock. */ 858 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 859 const struct sw_flow_id *sfid, 860 struct genl_info *info, 861 bool always, 862 uint32_t ufid_flags) 863 { 864 struct sk_buff *skb; 865 size_t len; 866 867 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 868 return NULL; 869 870 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); 871 skb = genlmsg_new(len, GFP_KERNEL); 872 if (!skb) 873 return ERR_PTR(-ENOMEM); 874 875 return skb; 876 } 877 878 /* Called with ovs_mutex. */ 879 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 880 int dp_ifindex, 881 struct genl_info *info, u8 cmd, 882 bool always, u32 ufid_flags) 883 { 884 struct sk_buff *skb; 885 int retval; 886 887 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), 888 &flow->id, info, always, ufid_flags); 889 if (IS_ERR_OR_NULL(skb)) 890 return skb; 891 892 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 893 info->snd_portid, info->snd_seq, 0, 894 cmd, ufid_flags); 895 BUG_ON(retval < 0); 896 return skb; 897 } 898 899 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 900 { 901 struct net *net = sock_net(skb->sk); 902 struct nlattr **a = info->attrs; 903 struct ovs_header *ovs_header = info->userhdr; 904 struct sw_flow *flow = NULL, *new_flow; 905 struct sw_flow_mask mask; 906 struct sk_buff *reply; 907 struct datapath *dp; 908 struct sw_flow_actions *acts; 909 struct sw_flow_match match; 910 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 911 int error; 912 bool log = !a[OVS_FLOW_ATTR_PROBE]; 913 914 /* Must have key and actions. */ 915 error = -EINVAL; 916 if (!a[OVS_FLOW_ATTR_KEY]) { 917 OVS_NLERR(log, "Flow key attr not present in new flow."); 918 goto error; 919 } 920 if (!a[OVS_FLOW_ATTR_ACTIONS]) { 921 OVS_NLERR(log, "Flow actions attr not present in new flow."); 922 goto error; 923 } 924 925 /* Most of the time we need to allocate a new flow, do it before 926 * locking. 927 */ 928 new_flow = ovs_flow_alloc(); 929 if (IS_ERR(new_flow)) { 930 error = PTR_ERR(new_flow); 931 goto error; 932 } 933 934 /* Extract key. */ 935 ovs_match_init(&match, &new_flow->key, false, &mask); 936 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 937 a[OVS_FLOW_ATTR_MASK], log); 938 if (error) 939 goto err_kfree_flow; 940 941 /* Extract flow identifier. */ 942 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID], 943 &new_flow->key, log); 944 if (error) 945 goto err_kfree_flow; 946 947 /* unmasked key is needed to match when ufid is not used. */ 948 if (ovs_identifier_is_key(&new_flow->id)) 949 match.key = new_flow->id.unmasked_key; 950 951 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask); 952 953 /* Validate actions. */ 954 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS], 955 &new_flow->key, &acts, log); 956 if (error) { 957 OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); 958 goto err_kfree_flow; 959 } 960 961 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false, 962 ufid_flags); 963 if (IS_ERR(reply)) { 964 error = PTR_ERR(reply); 965 goto err_kfree_acts; 966 } 967 968 ovs_lock(); 969 dp = get_dp(net, ovs_header->dp_ifindex); 970 if (unlikely(!dp)) { 971 error = -ENODEV; 972 goto err_unlock_ovs; 973 } 974 975 /* Check if this is a duplicate flow */ 976 if (ovs_identifier_is_ufid(&new_flow->id)) 977 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id); 978 if (!flow) 979 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key); 980 if (likely(!flow)) { 981 rcu_assign_pointer(new_flow->sf_acts, acts); 982 983 /* Put flow in bucket. */ 984 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 985 if (unlikely(error)) { 986 acts = NULL; 987 goto err_unlock_ovs; 988 } 989 990 if (unlikely(reply)) { 991 error = ovs_flow_cmd_fill_info(new_flow, 992 ovs_header->dp_ifindex, 993 reply, info->snd_portid, 994 info->snd_seq, 0, 995 OVS_FLOW_CMD_NEW, 996 ufid_flags); 997 BUG_ON(error < 0); 998 } 999 ovs_unlock(); 1000 } else { 1001 struct sw_flow_actions *old_acts; 1002 1003 /* Bail out if we're not allowed to modify an existing flow. 1004 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 1005 * because Generic Netlink treats the latter as a dump 1006 * request. We also accept NLM_F_EXCL in case that bug ever 1007 * gets fixed. 1008 */ 1009 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 1010 | NLM_F_EXCL))) { 1011 error = -EEXIST; 1012 goto err_unlock_ovs; 1013 } 1014 /* The flow identifier has to be the same for flow updates. 1015 * Look for any overlapping flow. 1016 */ 1017 if (unlikely(!ovs_flow_cmp(flow, &match))) { 1018 if (ovs_identifier_is_key(&flow->id)) 1019 flow = ovs_flow_tbl_lookup_exact(&dp->table, 1020 &match); 1021 else /* UFID matches but key is different */ 1022 flow = NULL; 1023 if (!flow) { 1024 error = -ENOENT; 1025 goto err_unlock_ovs; 1026 } 1027 } 1028 /* Update actions. */ 1029 old_acts = ovsl_dereference(flow->sf_acts); 1030 rcu_assign_pointer(flow->sf_acts, acts); 1031 1032 if (unlikely(reply)) { 1033 error = ovs_flow_cmd_fill_info(flow, 1034 ovs_header->dp_ifindex, 1035 reply, info->snd_portid, 1036 info->snd_seq, 0, 1037 OVS_FLOW_CMD_NEW, 1038 ufid_flags); 1039 BUG_ON(error < 0); 1040 } 1041 ovs_unlock(); 1042 1043 ovs_nla_free_flow_actions_rcu(old_acts); 1044 ovs_flow_free(new_flow, false); 1045 } 1046 1047 if (reply) 1048 ovs_notify(&dp_flow_genl_family, reply, info); 1049 return 0; 1050 1051 err_unlock_ovs: 1052 ovs_unlock(); 1053 kfree_skb(reply); 1054 err_kfree_acts: 1055 ovs_nla_free_flow_actions(acts); 1056 err_kfree_flow: 1057 ovs_flow_free(new_flow, false); 1058 error: 1059 return error; 1060 } 1061 1062 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ 1063 static struct sw_flow_actions *get_flow_actions(struct net *net, 1064 const struct nlattr *a, 1065 const struct sw_flow_key *key, 1066 const struct sw_flow_mask *mask, 1067 bool log) 1068 { 1069 struct sw_flow_actions *acts; 1070 struct sw_flow_key masked_key; 1071 int error; 1072 1073 ovs_flow_mask_key(&masked_key, key, true, mask); 1074 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log); 1075 if (error) { 1076 OVS_NLERR(log, 1077 "Actions may not be safe on all matching packets"); 1078 return ERR_PTR(error); 1079 } 1080 1081 return acts; 1082 } 1083 1084 /* Factor out match-init and action-copy to avoid 1085 * "Wframe-larger-than=1024" warning. Because mask is only 1086 * used to get actions, we new a function to save some 1087 * stack space. 1088 * 1089 * If there are not key and action attrs, we return 0 1090 * directly. In the case, the caller will also not use the 1091 * match as before. If there is action attr, we try to get 1092 * actions and save them to *acts. Before returning from 1093 * the function, we reset the match->mask pointer. Because 1094 * we should not to return match object with dangling reference 1095 * to mask. 1096 * */ 1097 static int ovs_nla_init_match_and_action(struct net *net, 1098 struct sw_flow_match *match, 1099 struct sw_flow_key *key, 1100 struct nlattr **a, 1101 struct sw_flow_actions **acts, 1102 bool log) 1103 { 1104 struct sw_flow_mask mask; 1105 int error = 0; 1106 1107 if (a[OVS_FLOW_ATTR_KEY]) { 1108 ovs_match_init(match, key, true, &mask); 1109 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY], 1110 a[OVS_FLOW_ATTR_MASK], log); 1111 if (error) 1112 goto error; 1113 } 1114 1115 if (a[OVS_FLOW_ATTR_ACTIONS]) { 1116 if (!a[OVS_FLOW_ATTR_KEY]) { 1117 OVS_NLERR(log, 1118 "Flow key attribute not present in set flow."); 1119 error = -EINVAL; 1120 goto error; 1121 } 1122 1123 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key, 1124 &mask, log); 1125 if (IS_ERR(*acts)) { 1126 error = PTR_ERR(*acts); 1127 goto error; 1128 } 1129 } 1130 1131 /* On success, error is 0. */ 1132 error: 1133 match->mask = NULL; 1134 return error; 1135 } 1136 1137 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 1138 { 1139 struct net *net = sock_net(skb->sk); 1140 struct nlattr **a = info->attrs; 1141 struct ovs_header *ovs_header = info->userhdr; 1142 struct sw_flow_key key; 1143 struct sw_flow *flow; 1144 struct sk_buff *reply = NULL; 1145 struct datapath *dp; 1146 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 1147 struct sw_flow_match match; 1148 struct sw_flow_id sfid; 1149 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1150 int error = 0; 1151 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1152 bool ufid_present; 1153 1154 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); 1155 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) { 1156 OVS_NLERR(log, 1157 "Flow set message rejected, Key attribute missing."); 1158 return -EINVAL; 1159 } 1160 1161 error = ovs_nla_init_match_and_action(net, &match, &key, a, 1162 &acts, log); 1163 if (error) 1164 goto error; 1165 1166 if (acts) { 1167 /* Can allocate before locking if have acts. */ 1168 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false, 1169 ufid_flags); 1170 if (IS_ERR(reply)) { 1171 error = PTR_ERR(reply); 1172 goto err_kfree_acts; 1173 } 1174 } 1175 1176 ovs_lock(); 1177 dp = get_dp(net, ovs_header->dp_ifindex); 1178 if (unlikely(!dp)) { 1179 error = -ENODEV; 1180 goto err_unlock_ovs; 1181 } 1182 /* Check that the flow exists. */ 1183 if (ufid_present) 1184 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid); 1185 else 1186 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1187 if (unlikely(!flow)) { 1188 error = -ENOENT; 1189 goto err_unlock_ovs; 1190 } 1191 1192 /* Update actions, if present. */ 1193 if (likely(acts)) { 1194 old_acts = ovsl_dereference(flow->sf_acts); 1195 rcu_assign_pointer(flow->sf_acts, acts); 1196 1197 if (unlikely(reply)) { 1198 error = ovs_flow_cmd_fill_info(flow, 1199 ovs_header->dp_ifindex, 1200 reply, info->snd_portid, 1201 info->snd_seq, 0, 1202 OVS_FLOW_CMD_SET, 1203 ufid_flags); 1204 BUG_ON(error < 0); 1205 } 1206 } else { 1207 /* Could not alloc without acts before locking. */ 1208 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1209 info, OVS_FLOW_CMD_SET, false, 1210 ufid_flags); 1211 1212 if (IS_ERR(reply)) { 1213 error = PTR_ERR(reply); 1214 goto err_unlock_ovs; 1215 } 1216 } 1217 1218 /* Clear stats. */ 1219 if (a[OVS_FLOW_ATTR_CLEAR]) 1220 ovs_flow_stats_clear(flow); 1221 ovs_unlock(); 1222 1223 if (reply) 1224 ovs_notify(&dp_flow_genl_family, reply, info); 1225 if (old_acts) 1226 ovs_nla_free_flow_actions_rcu(old_acts); 1227 1228 return 0; 1229 1230 err_unlock_ovs: 1231 ovs_unlock(); 1232 kfree_skb(reply); 1233 err_kfree_acts: 1234 ovs_nla_free_flow_actions(acts); 1235 error: 1236 return error; 1237 } 1238 1239 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1240 { 1241 struct nlattr **a = info->attrs; 1242 struct ovs_header *ovs_header = info->userhdr; 1243 struct net *net = sock_net(skb->sk); 1244 struct sw_flow_key key; 1245 struct sk_buff *reply; 1246 struct sw_flow *flow; 1247 struct datapath *dp; 1248 struct sw_flow_match match; 1249 struct sw_flow_id ufid; 1250 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1251 int err = 0; 1252 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1253 bool ufid_present; 1254 1255 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1256 if (a[OVS_FLOW_ATTR_KEY]) { 1257 ovs_match_init(&match, &key, true, NULL); 1258 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL, 1259 log); 1260 } else if (!ufid_present) { 1261 OVS_NLERR(log, 1262 "Flow get message rejected, Key attribute missing."); 1263 err = -EINVAL; 1264 } 1265 if (err) 1266 return err; 1267 1268 ovs_lock(); 1269 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1270 if (!dp) { 1271 err = -ENODEV; 1272 goto unlock; 1273 } 1274 1275 if (ufid_present) 1276 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1277 else 1278 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1279 if (!flow) { 1280 err = -ENOENT; 1281 goto unlock; 1282 } 1283 1284 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1285 OVS_FLOW_CMD_GET, true, ufid_flags); 1286 if (IS_ERR(reply)) { 1287 err = PTR_ERR(reply); 1288 goto unlock; 1289 } 1290 1291 ovs_unlock(); 1292 return genlmsg_reply(reply, info); 1293 unlock: 1294 ovs_unlock(); 1295 return err; 1296 } 1297 1298 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1299 { 1300 struct nlattr **a = info->attrs; 1301 struct ovs_header *ovs_header = info->userhdr; 1302 struct net *net = sock_net(skb->sk); 1303 struct sw_flow_key key; 1304 struct sk_buff *reply; 1305 struct sw_flow *flow = NULL; 1306 struct datapath *dp; 1307 struct sw_flow_match match; 1308 struct sw_flow_id ufid; 1309 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1310 int err; 1311 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1312 bool ufid_present; 1313 1314 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1315 if (a[OVS_FLOW_ATTR_KEY]) { 1316 ovs_match_init(&match, &key, true, NULL); 1317 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1318 NULL, log); 1319 if (unlikely(err)) 1320 return err; 1321 } 1322 1323 ovs_lock(); 1324 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1325 if (unlikely(!dp)) { 1326 err = -ENODEV; 1327 goto unlock; 1328 } 1329 1330 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) { 1331 err = ovs_flow_tbl_flush(&dp->table); 1332 goto unlock; 1333 } 1334 1335 if (ufid_present) 1336 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1337 else 1338 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1339 if (unlikely(!flow)) { 1340 err = -ENOENT; 1341 goto unlock; 1342 } 1343 1344 ovs_flow_tbl_remove(&dp->table, flow); 1345 ovs_unlock(); 1346 1347 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1348 &flow->id, info, false, ufid_flags); 1349 if (likely(reply)) { 1350 if (likely(!IS_ERR(reply))) { 1351 rcu_read_lock(); /*To keep RCU checker happy. */ 1352 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1353 reply, info->snd_portid, 1354 info->snd_seq, 0, 1355 OVS_FLOW_CMD_DEL, 1356 ufid_flags); 1357 rcu_read_unlock(); 1358 BUG_ON(err < 0); 1359 1360 ovs_notify(&dp_flow_genl_family, reply, info); 1361 } else { 1362 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply)); 1363 } 1364 } 1365 1366 ovs_flow_free(flow, true); 1367 return 0; 1368 unlock: 1369 ovs_unlock(); 1370 return err; 1371 } 1372 1373 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1374 { 1375 struct nlattr *a[__OVS_FLOW_ATTR_MAX]; 1376 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1377 struct table_instance *ti; 1378 struct datapath *dp; 1379 u32 ufid_flags; 1380 int err; 1381 1382 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a, 1383 OVS_FLOW_ATTR_MAX, flow_policy, NULL); 1384 if (err) 1385 return err; 1386 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1387 1388 rcu_read_lock(); 1389 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1390 if (!dp) { 1391 rcu_read_unlock(); 1392 return -ENODEV; 1393 } 1394 1395 ti = rcu_dereference(dp->table.ti); 1396 for (;;) { 1397 struct sw_flow *flow; 1398 u32 bucket, obj; 1399 1400 bucket = cb->args[0]; 1401 obj = cb->args[1]; 1402 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1403 if (!flow) 1404 break; 1405 1406 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1407 NETLINK_CB(cb->skb).portid, 1408 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1409 OVS_FLOW_CMD_GET, ufid_flags) < 0) 1410 break; 1411 1412 cb->args[0] = bucket; 1413 cb->args[1] = obj; 1414 } 1415 rcu_read_unlock(); 1416 return skb->len; 1417 } 1418 1419 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1420 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1421 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1422 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1423 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1424 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1425 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, 1426 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, 1427 }; 1428 1429 static const struct genl_ops dp_flow_genl_ops[] = { 1430 { .cmd = OVS_FLOW_CMD_NEW, 1431 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1432 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1433 .doit = ovs_flow_cmd_new 1434 }, 1435 { .cmd = OVS_FLOW_CMD_DEL, 1436 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1437 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1438 .doit = ovs_flow_cmd_del 1439 }, 1440 { .cmd = OVS_FLOW_CMD_GET, 1441 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1442 .flags = 0, /* OK for unprivileged users. */ 1443 .doit = ovs_flow_cmd_get, 1444 .dumpit = ovs_flow_cmd_dump 1445 }, 1446 { .cmd = OVS_FLOW_CMD_SET, 1447 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1448 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1449 .doit = ovs_flow_cmd_set, 1450 }, 1451 }; 1452 1453 static struct genl_family dp_flow_genl_family __ro_after_init = { 1454 .hdrsize = sizeof(struct ovs_header), 1455 .name = OVS_FLOW_FAMILY, 1456 .version = OVS_FLOW_VERSION, 1457 .maxattr = OVS_FLOW_ATTR_MAX, 1458 .policy = flow_policy, 1459 .netnsok = true, 1460 .parallel_ops = true, 1461 .ops = dp_flow_genl_ops, 1462 .n_ops = ARRAY_SIZE(dp_flow_genl_ops), 1463 .mcgrps = &ovs_dp_flow_multicast_group, 1464 .n_mcgrps = 1, 1465 .module = THIS_MODULE, 1466 }; 1467 1468 static size_t ovs_dp_cmd_msg_size(void) 1469 { 1470 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1471 1472 msgsize += nla_total_size(IFNAMSIZ); 1473 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats)); 1474 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats)); 1475 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1476 1477 return msgsize; 1478 } 1479 1480 /* Called with ovs_mutex. */ 1481 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1482 u32 portid, u32 seq, u32 flags, u8 cmd) 1483 { 1484 struct ovs_header *ovs_header; 1485 struct ovs_dp_stats dp_stats; 1486 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1487 int err; 1488 1489 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1490 flags, cmd); 1491 if (!ovs_header) 1492 goto error; 1493 1494 ovs_header->dp_ifindex = get_dpifindex(dp); 1495 1496 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1497 if (err) 1498 goto nla_put_failure; 1499 1500 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1501 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1502 &dp_stats, OVS_DP_ATTR_PAD)) 1503 goto nla_put_failure; 1504 1505 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1506 sizeof(struct ovs_dp_megaflow_stats), 1507 &dp_megaflow_stats, OVS_DP_ATTR_PAD)) 1508 goto nla_put_failure; 1509 1510 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1511 goto nla_put_failure; 1512 1513 genlmsg_end(skb, ovs_header); 1514 return 0; 1515 1516 nla_put_failure: 1517 genlmsg_cancel(skb, ovs_header); 1518 error: 1519 return -EMSGSIZE; 1520 } 1521 1522 static struct sk_buff *ovs_dp_cmd_alloc_info(void) 1523 { 1524 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL); 1525 } 1526 1527 /* Called with rcu_read_lock or ovs_mutex. */ 1528 static struct datapath *lookup_datapath(struct net *net, 1529 const struct ovs_header *ovs_header, 1530 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1531 { 1532 struct datapath *dp; 1533 1534 if (!a[OVS_DP_ATTR_NAME]) 1535 dp = get_dp(net, ovs_header->dp_ifindex); 1536 else { 1537 struct vport *vport; 1538 1539 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1540 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1541 } 1542 return dp ? dp : ERR_PTR(-ENODEV); 1543 } 1544 1545 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info) 1546 { 1547 struct datapath *dp; 1548 1549 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1550 if (IS_ERR(dp)) 1551 return; 1552 1553 WARN(dp->user_features, "Dropping previously announced user features\n"); 1554 dp->user_features = 0; 1555 } 1556 1557 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1558 { 1559 if (a[OVS_DP_ATTR_USER_FEATURES]) 1560 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1561 } 1562 1563 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1564 { 1565 struct nlattr **a = info->attrs; 1566 struct vport_parms parms; 1567 struct sk_buff *reply; 1568 struct datapath *dp; 1569 struct vport *vport; 1570 struct ovs_net *ovs_net; 1571 int err, i; 1572 1573 err = -EINVAL; 1574 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1575 goto err; 1576 1577 reply = ovs_dp_cmd_alloc_info(); 1578 if (!reply) 1579 return -ENOMEM; 1580 1581 err = -ENOMEM; 1582 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1583 if (dp == NULL) 1584 goto err_free_reply; 1585 1586 ovs_dp_set_net(dp, sock_net(skb->sk)); 1587 1588 /* Allocate table. */ 1589 err = ovs_flow_tbl_init(&dp->table); 1590 if (err) 1591 goto err_free_dp; 1592 1593 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1594 if (!dp->stats_percpu) { 1595 err = -ENOMEM; 1596 goto err_destroy_table; 1597 } 1598 1599 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS, 1600 sizeof(struct hlist_head), 1601 GFP_KERNEL); 1602 if (!dp->ports) { 1603 err = -ENOMEM; 1604 goto err_destroy_percpu; 1605 } 1606 1607 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1608 INIT_HLIST_HEAD(&dp->ports[i]); 1609 1610 err = ovs_meters_init(dp); 1611 if (err) 1612 goto err_destroy_ports_array; 1613 1614 /* Set up our datapath device. */ 1615 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1616 parms.type = OVS_VPORT_TYPE_INTERNAL; 1617 parms.options = NULL; 1618 parms.dp = dp; 1619 parms.port_no = OVSP_LOCAL; 1620 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1621 1622 ovs_dp_change(dp, a); 1623 1624 /* So far only local changes have been made, now need the lock. */ 1625 ovs_lock(); 1626 1627 vport = new_vport(&parms); 1628 if (IS_ERR(vport)) { 1629 err = PTR_ERR(vport); 1630 if (err == -EBUSY) 1631 err = -EEXIST; 1632 1633 if (err == -EEXIST) { 1634 /* An outdated user space instance that does not understand 1635 * the concept of user_features has attempted to create a new 1636 * datapath and is likely to reuse it. Drop all user features. 1637 */ 1638 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1639 ovs_dp_reset_user_features(skb, info); 1640 } 1641 1642 goto err_destroy_meters; 1643 } 1644 1645 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1646 info->snd_seq, 0, OVS_DP_CMD_NEW); 1647 BUG_ON(err < 0); 1648 1649 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1650 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1651 1652 ovs_unlock(); 1653 1654 ovs_notify(&dp_datapath_genl_family, reply, info); 1655 return 0; 1656 1657 err_destroy_meters: 1658 ovs_unlock(); 1659 ovs_meters_exit(dp); 1660 err_destroy_ports_array: 1661 kfree(dp->ports); 1662 err_destroy_percpu: 1663 free_percpu(dp->stats_percpu); 1664 err_destroy_table: 1665 ovs_flow_tbl_destroy(&dp->table); 1666 err_free_dp: 1667 kfree(dp); 1668 err_free_reply: 1669 kfree_skb(reply); 1670 err: 1671 return err; 1672 } 1673 1674 /* Called with ovs_mutex. */ 1675 static void __dp_destroy(struct datapath *dp) 1676 { 1677 int i; 1678 1679 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1680 struct vport *vport; 1681 struct hlist_node *n; 1682 1683 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1684 if (vport->port_no != OVSP_LOCAL) 1685 ovs_dp_detach_port(vport); 1686 } 1687 1688 list_del_rcu(&dp->list_node); 1689 1690 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1691 * all ports in datapath are destroyed first before freeing datapath. 1692 */ 1693 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1694 1695 /* RCU destroy the flow table */ 1696 call_rcu(&dp->rcu, destroy_dp_rcu); 1697 } 1698 1699 static int ovs_dp_cmd_del(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 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1716 info->snd_seq, 0, OVS_DP_CMD_DEL); 1717 BUG_ON(err < 0); 1718 1719 __dp_destroy(dp); 1720 ovs_unlock(); 1721 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_set(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 err = PTR_ERR(dp); 1745 if (IS_ERR(dp)) 1746 goto err_unlock_free; 1747 1748 ovs_dp_change(dp, info->attrs); 1749 1750 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1751 info->snd_seq, 0, OVS_DP_CMD_SET); 1752 BUG_ON(err < 0); 1753 1754 ovs_unlock(); 1755 ovs_notify(&dp_datapath_genl_family, reply, info); 1756 1757 return 0; 1758 1759 err_unlock_free: 1760 ovs_unlock(); 1761 kfree_skb(reply); 1762 return err; 1763 } 1764 1765 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1766 { 1767 struct sk_buff *reply; 1768 struct datapath *dp; 1769 int err; 1770 1771 reply = ovs_dp_cmd_alloc_info(); 1772 if (!reply) 1773 return -ENOMEM; 1774 1775 ovs_lock(); 1776 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1777 if (IS_ERR(dp)) { 1778 err = PTR_ERR(dp); 1779 goto err_unlock_free; 1780 } 1781 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1782 info->snd_seq, 0, OVS_DP_CMD_GET); 1783 BUG_ON(err < 0); 1784 ovs_unlock(); 1785 1786 return genlmsg_reply(reply, info); 1787 1788 err_unlock_free: 1789 ovs_unlock(); 1790 kfree_skb(reply); 1791 return err; 1792 } 1793 1794 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1795 { 1796 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1797 struct datapath *dp; 1798 int skip = cb->args[0]; 1799 int i = 0; 1800 1801 ovs_lock(); 1802 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1803 if (i >= skip && 1804 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1805 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1806 OVS_DP_CMD_GET) < 0) 1807 break; 1808 i++; 1809 } 1810 ovs_unlock(); 1811 1812 cb->args[0] = i; 1813 1814 return skb->len; 1815 } 1816 1817 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1818 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1819 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1820 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1821 }; 1822 1823 static const struct genl_ops dp_datapath_genl_ops[] = { 1824 { .cmd = OVS_DP_CMD_NEW, 1825 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1826 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1827 .doit = ovs_dp_cmd_new 1828 }, 1829 { .cmd = OVS_DP_CMD_DEL, 1830 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1831 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1832 .doit = ovs_dp_cmd_del 1833 }, 1834 { .cmd = OVS_DP_CMD_GET, 1835 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1836 .flags = 0, /* OK for unprivileged users. */ 1837 .doit = ovs_dp_cmd_get, 1838 .dumpit = ovs_dp_cmd_dump 1839 }, 1840 { .cmd = OVS_DP_CMD_SET, 1841 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1842 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1843 .doit = ovs_dp_cmd_set, 1844 }, 1845 }; 1846 1847 static struct genl_family dp_datapath_genl_family __ro_after_init = { 1848 .hdrsize = sizeof(struct ovs_header), 1849 .name = OVS_DATAPATH_FAMILY, 1850 .version = OVS_DATAPATH_VERSION, 1851 .maxattr = OVS_DP_ATTR_MAX, 1852 .policy = datapath_policy, 1853 .netnsok = true, 1854 .parallel_ops = true, 1855 .ops = dp_datapath_genl_ops, 1856 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops), 1857 .mcgrps = &ovs_dp_datapath_multicast_group, 1858 .n_mcgrps = 1, 1859 .module = THIS_MODULE, 1860 }; 1861 1862 /* Called with ovs_mutex or RCU read lock. */ 1863 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1864 struct net *net, u32 portid, u32 seq, 1865 u32 flags, u8 cmd) 1866 { 1867 struct ovs_header *ovs_header; 1868 struct ovs_vport_stats vport_stats; 1869 int err; 1870 1871 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1872 flags, cmd); 1873 if (!ovs_header) 1874 return -EMSGSIZE; 1875 1876 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1877 1878 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1879 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1880 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 1881 ovs_vport_name(vport)) || 1882 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex)) 1883 goto nla_put_failure; 1884 1885 if (!net_eq(net, dev_net(vport->dev))) { 1886 int id = peernet2id_alloc(net, dev_net(vport->dev)); 1887 1888 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id)) 1889 goto nla_put_failure; 1890 } 1891 1892 ovs_vport_get_stats(vport, &vport_stats); 1893 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS, 1894 sizeof(struct ovs_vport_stats), &vport_stats, 1895 OVS_VPORT_ATTR_PAD)) 1896 goto nla_put_failure; 1897 1898 if (ovs_vport_get_upcall_portids(vport, skb)) 1899 goto nla_put_failure; 1900 1901 err = ovs_vport_get_options(vport, skb); 1902 if (err == -EMSGSIZE) 1903 goto error; 1904 1905 genlmsg_end(skb, ovs_header); 1906 return 0; 1907 1908 nla_put_failure: 1909 err = -EMSGSIZE; 1910 error: 1911 genlmsg_cancel(skb, ovs_header); 1912 return err; 1913 } 1914 1915 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 1916 { 1917 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1918 } 1919 1920 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 1921 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net, 1922 u32 portid, u32 seq, u8 cmd) 1923 { 1924 struct sk_buff *skb; 1925 int retval; 1926 1927 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1928 if (!skb) 1929 return ERR_PTR(-ENOMEM); 1930 1931 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd); 1932 BUG_ON(retval < 0); 1933 1934 return skb; 1935 } 1936 1937 /* Called with ovs_mutex or RCU read lock. */ 1938 static struct vport *lookup_vport(struct net *net, 1939 const struct ovs_header *ovs_header, 1940 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1941 { 1942 struct datapath *dp; 1943 struct vport *vport; 1944 1945 if (a[OVS_VPORT_ATTR_IFINDEX]) 1946 return ERR_PTR(-EOPNOTSUPP); 1947 if (a[OVS_VPORT_ATTR_NAME]) { 1948 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 1949 if (!vport) 1950 return ERR_PTR(-ENODEV); 1951 if (ovs_header->dp_ifindex && 1952 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 1953 return ERR_PTR(-ENODEV); 1954 return vport; 1955 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 1956 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1957 1958 if (port_no >= DP_MAX_PORTS) 1959 return ERR_PTR(-EFBIG); 1960 1961 dp = get_dp(net, ovs_header->dp_ifindex); 1962 if (!dp) 1963 return ERR_PTR(-ENODEV); 1964 1965 vport = ovs_vport_ovsl_rcu(dp, port_no); 1966 if (!vport) 1967 return ERR_PTR(-ENODEV); 1968 return vport; 1969 } else 1970 return ERR_PTR(-EINVAL); 1971 1972 } 1973 1974 /* Called with ovs_mutex */ 1975 static void update_headroom(struct datapath *dp) 1976 { 1977 unsigned dev_headroom, max_headroom = 0; 1978 struct net_device *dev; 1979 struct vport *vport; 1980 int i; 1981 1982 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1983 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 1984 dev = vport->dev; 1985 dev_headroom = netdev_get_fwd_headroom(dev); 1986 if (dev_headroom > max_headroom) 1987 max_headroom = dev_headroom; 1988 } 1989 } 1990 1991 dp->max_headroom = max_headroom; 1992 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1993 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) 1994 netdev_set_rx_headroom(vport->dev, max_headroom); 1995 } 1996 1997 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 1998 { 1999 struct nlattr **a = info->attrs; 2000 struct ovs_header *ovs_header = info->userhdr; 2001 struct vport_parms parms; 2002 struct sk_buff *reply; 2003 struct vport *vport; 2004 struct datapath *dp; 2005 u32 port_no; 2006 int err; 2007 2008 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 2009 !a[OVS_VPORT_ATTR_UPCALL_PID]) 2010 return -EINVAL; 2011 if (a[OVS_VPORT_ATTR_IFINDEX]) 2012 return -EOPNOTSUPP; 2013 2014 port_no = a[OVS_VPORT_ATTR_PORT_NO] 2015 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 2016 if (port_no >= DP_MAX_PORTS) 2017 return -EFBIG; 2018 2019 reply = ovs_vport_cmd_alloc_info(); 2020 if (!reply) 2021 return -ENOMEM; 2022 2023 ovs_lock(); 2024 restart: 2025 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 2026 err = -ENODEV; 2027 if (!dp) 2028 goto exit_unlock_free; 2029 2030 if (port_no) { 2031 vport = ovs_vport_ovsl(dp, port_no); 2032 err = -EBUSY; 2033 if (vport) 2034 goto exit_unlock_free; 2035 } else { 2036 for (port_no = 1; ; port_no++) { 2037 if (port_no >= DP_MAX_PORTS) { 2038 err = -EFBIG; 2039 goto exit_unlock_free; 2040 } 2041 vport = ovs_vport_ovsl(dp, port_no); 2042 if (!vport) 2043 break; 2044 } 2045 } 2046 2047 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 2048 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 2049 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 2050 parms.dp = dp; 2051 parms.port_no = port_no; 2052 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2053 2054 vport = new_vport(&parms); 2055 err = PTR_ERR(vport); 2056 if (IS_ERR(vport)) { 2057 if (err == -EAGAIN) 2058 goto restart; 2059 goto exit_unlock_free; 2060 } 2061 2062 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2063 info->snd_portid, info->snd_seq, 0, 2064 OVS_VPORT_CMD_NEW); 2065 2066 if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom) 2067 update_headroom(dp); 2068 else 2069 netdev_set_rx_headroom(vport->dev, dp->max_headroom); 2070 2071 BUG_ON(err < 0); 2072 ovs_unlock(); 2073 2074 ovs_notify(&dp_vport_genl_family, reply, info); 2075 return 0; 2076 2077 exit_unlock_free: 2078 ovs_unlock(); 2079 kfree_skb(reply); 2080 return err; 2081 } 2082 2083 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 2084 { 2085 struct nlattr **a = info->attrs; 2086 struct sk_buff *reply; 2087 struct vport *vport; 2088 int err; 2089 2090 reply = ovs_vport_cmd_alloc_info(); 2091 if (!reply) 2092 return -ENOMEM; 2093 2094 ovs_lock(); 2095 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2096 err = PTR_ERR(vport); 2097 if (IS_ERR(vport)) 2098 goto exit_unlock_free; 2099 2100 if (a[OVS_VPORT_ATTR_TYPE] && 2101 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 2102 err = -EINVAL; 2103 goto exit_unlock_free; 2104 } 2105 2106 if (a[OVS_VPORT_ATTR_OPTIONS]) { 2107 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 2108 if (err) 2109 goto exit_unlock_free; 2110 } 2111 2112 2113 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 2114 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2115 2116 err = ovs_vport_set_upcall_portids(vport, ids); 2117 if (err) 2118 goto exit_unlock_free; 2119 } 2120 2121 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2122 info->snd_portid, info->snd_seq, 0, 2123 OVS_VPORT_CMD_SET); 2124 BUG_ON(err < 0); 2125 2126 ovs_unlock(); 2127 ovs_notify(&dp_vport_genl_family, reply, info); 2128 return 0; 2129 2130 exit_unlock_free: 2131 ovs_unlock(); 2132 kfree_skb(reply); 2133 return err; 2134 } 2135 2136 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2137 { 2138 bool must_update_headroom = false; 2139 struct nlattr **a = info->attrs; 2140 struct sk_buff *reply; 2141 struct datapath *dp; 2142 struct vport *vport; 2143 int err; 2144 2145 reply = ovs_vport_cmd_alloc_info(); 2146 if (!reply) 2147 return -ENOMEM; 2148 2149 ovs_lock(); 2150 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2151 err = PTR_ERR(vport); 2152 if (IS_ERR(vport)) 2153 goto exit_unlock_free; 2154 2155 if (vport->port_no == OVSP_LOCAL) { 2156 err = -EINVAL; 2157 goto exit_unlock_free; 2158 } 2159 2160 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2161 info->snd_portid, info->snd_seq, 0, 2162 OVS_VPORT_CMD_DEL); 2163 BUG_ON(err < 0); 2164 2165 /* the vport deletion may trigger dp headroom update */ 2166 dp = vport->dp; 2167 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom) 2168 must_update_headroom = true; 2169 netdev_reset_rx_headroom(vport->dev); 2170 ovs_dp_detach_port(vport); 2171 2172 if (must_update_headroom) 2173 update_headroom(dp); 2174 ovs_unlock(); 2175 2176 ovs_notify(&dp_vport_genl_family, reply, info); 2177 return 0; 2178 2179 exit_unlock_free: 2180 ovs_unlock(); 2181 kfree_skb(reply); 2182 return err; 2183 } 2184 2185 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2186 { 2187 struct nlattr **a = info->attrs; 2188 struct ovs_header *ovs_header = info->userhdr; 2189 struct sk_buff *reply; 2190 struct vport *vport; 2191 int err; 2192 2193 reply = ovs_vport_cmd_alloc_info(); 2194 if (!reply) 2195 return -ENOMEM; 2196 2197 rcu_read_lock(); 2198 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2199 err = PTR_ERR(vport); 2200 if (IS_ERR(vport)) 2201 goto exit_unlock_free; 2202 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2203 info->snd_portid, info->snd_seq, 0, 2204 OVS_VPORT_CMD_GET); 2205 BUG_ON(err < 0); 2206 rcu_read_unlock(); 2207 2208 return genlmsg_reply(reply, info); 2209 2210 exit_unlock_free: 2211 rcu_read_unlock(); 2212 kfree_skb(reply); 2213 return err; 2214 } 2215 2216 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2217 { 2218 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2219 struct datapath *dp; 2220 int bucket = cb->args[0], skip = cb->args[1]; 2221 int i, j = 0; 2222 2223 rcu_read_lock(); 2224 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2225 if (!dp) { 2226 rcu_read_unlock(); 2227 return -ENODEV; 2228 } 2229 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2230 struct vport *vport; 2231 2232 j = 0; 2233 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2234 if (j >= skip && 2235 ovs_vport_cmd_fill_info(vport, skb, 2236 sock_net(skb->sk), 2237 NETLINK_CB(cb->skb).portid, 2238 cb->nlh->nlmsg_seq, 2239 NLM_F_MULTI, 2240 OVS_VPORT_CMD_GET) < 0) 2241 goto out; 2242 2243 j++; 2244 } 2245 skip = 0; 2246 } 2247 out: 2248 rcu_read_unlock(); 2249 2250 cb->args[0] = i; 2251 cb->args[1] = j; 2252 2253 return skb->len; 2254 } 2255 2256 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2257 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2258 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2259 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2260 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2261 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 2262 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2263 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 }, 2264 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 }, 2265 }; 2266 2267 static const struct genl_ops dp_vport_genl_ops[] = { 2268 { .cmd = OVS_VPORT_CMD_NEW, 2269 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2270 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2271 .doit = ovs_vport_cmd_new 2272 }, 2273 { .cmd = OVS_VPORT_CMD_DEL, 2274 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2275 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2276 .doit = ovs_vport_cmd_del 2277 }, 2278 { .cmd = OVS_VPORT_CMD_GET, 2279 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2280 .flags = 0, /* OK for unprivileged users. */ 2281 .doit = ovs_vport_cmd_get, 2282 .dumpit = ovs_vport_cmd_dump 2283 }, 2284 { .cmd = OVS_VPORT_CMD_SET, 2285 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2286 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2287 .doit = ovs_vport_cmd_set, 2288 }, 2289 }; 2290 2291 struct genl_family dp_vport_genl_family __ro_after_init = { 2292 .hdrsize = sizeof(struct ovs_header), 2293 .name = OVS_VPORT_FAMILY, 2294 .version = OVS_VPORT_VERSION, 2295 .maxattr = OVS_VPORT_ATTR_MAX, 2296 .policy = vport_policy, 2297 .netnsok = true, 2298 .parallel_ops = true, 2299 .ops = dp_vport_genl_ops, 2300 .n_ops = ARRAY_SIZE(dp_vport_genl_ops), 2301 .mcgrps = &ovs_dp_vport_multicast_group, 2302 .n_mcgrps = 1, 2303 .module = THIS_MODULE, 2304 }; 2305 2306 static struct genl_family * const dp_genl_families[] = { 2307 &dp_datapath_genl_family, 2308 &dp_vport_genl_family, 2309 &dp_flow_genl_family, 2310 &dp_packet_genl_family, 2311 &dp_meter_genl_family, 2312 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 2313 &dp_ct_limit_genl_family, 2314 #endif 2315 }; 2316 2317 static void dp_unregister_genl(int n_families) 2318 { 2319 int i; 2320 2321 for (i = 0; i < n_families; i++) 2322 genl_unregister_family(dp_genl_families[i]); 2323 } 2324 2325 static int __init dp_register_genl(void) 2326 { 2327 int err; 2328 int i; 2329 2330 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2331 2332 err = genl_register_family(dp_genl_families[i]); 2333 if (err) 2334 goto error; 2335 } 2336 2337 return 0; 2338 2339 error: 2340 dp_unregister_genl(i); 2341 return err; 2342 } 2343 2344 static int __net_init ovs_init_net(struct net *net) 2345 { 2346 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2347 2348 INIT_LIST_HEAD(&ovs_net->dps); 2349 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2350 return ovs_ct_init(net); 2351 } 2352 2353 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2354 struct list_head *head) 2355 { 2356 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2357 struct datapath *dp; 2358 2359 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2360 int i; 2361 2362 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2363 struct vport *vport; 2364 2365 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2366 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2367 continue; 2368 2369 if (dev_net(vport->dev) == dnet) 2370 list_add(&vport->detach_list, head); 2371 } 2372 } 2373 } 2374 } 2375 2376 static void __net_exit ovs_exit_net(struct net *dnet) 2377 { 2378 struct datapath *dp, *dp_next; 2379 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2380 struct vport *vport, *vport_next; 2381 struct net *net; 2382 LIST_HEAD(head); 2383 2384 ovs_ct_exit(dnet); 2385 ovs_lock(); 2386 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2387 __dp_destroy(dp); 2388 2389 down_read(&net_rwsem); 2390 for_each_net(net) 2391 list_vports_from_net(net, dnet, &head); 2392 up_read(&net_rwsem); 2393 2394 /* Detach all vports from given namespace. */ 2395 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2396 list_del(&vport->detach_list); 2397 ovs_dp_detach_port(vport); 2398 } 2399 2400 ovs_unlock(); 2401 2402 cancel_work_sync(&ovs_net->dp_notify_work); 2403 } 2404 2405 static struct pernet_operations ovs_net_ops = { 2406 .init = ovs_init_net, 2407 .exit = ovs_exit_net, 2408 .id = &ovs_net_id, 2409 .size = sizeof(struct ovs_net), 2410 }; 2411 2412 static int __init dp_init(void) 2413 { 2414 int err; 2415 2416 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); 2417 2418 pr_info("Open vSwitch switching datapath\n"); 2419 2420 err = action_fifos_init(); 2421 if (err) 2422 goto error; 2423 2424 err = ovs_internal_dev_rtnl_link_register(); 2425 if (err) 2426 goto error_action_fifos_exit; 2427 2428 err = ovs_flow_init(); 2429 if (err) 2430 goto error_unreg_rtnl_link; 2431 2432 err = ovs_vport_init(); 2433 if (err) 2434 goto error_flow_exit; 2435 2436 err = register_pernet_device(&ovs_net_ops); 2437 if (err) 2438 goto error_vport_exit; 2439 2440 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2441 if (err) 2442 goto error_netns_exit; 2443 2444 err = ovs_netdev_init(); 2445 if (err) 2446 goto error_unreg_notifier; 2447 2448 err = dp_register_genl(); 2449 if (err < 0) 2450 goto error_unreg_netdev; 2451 2452 return 0; 2453 2454 error_unreg_netdev: 2455 ovs_netdev_exit(); 2456 error_unreg_notifier: 2457 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2458 error_netns_exit: 2459 unregister_pernet_device(&ovs_net_ops); 2460 error_vport_exit: 2461 ovs_vport_exit(); 2462 error_flow_exit: 2463 ovs_flow_exit(); 2464 error_unreg_rtnl_link: 2465 ovs_internal_dev_rtnl_link_unregister(); 2466 error_action_fifos_exit: 2467 action_fifos_exit(); 2468 error: 2469 return err; 2470 } 2471 2472 static void dp_cleanup(void) 2473 { 2474 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2475 ovs_netdev_exit(); 2476 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2477 unregister_pernet_device(&ovs_net_ops); 2478 rcu_barrier(); 2479 ovs_vport_exit(); 2480 ovs_flow_exit(); 2481 ovs_internal_dev_rtnl_link_unregister(); 2482 action_fifos_exit(); 2483 } 2484 2485 module_init(dp_init); 2486 module_exit(dp_cleanup); 2487 2488 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2489 MODULE_LICENSE("GPL"); 2490 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY); 2491 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY); 2492 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY); 2493 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY); 2494 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY); 2495 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY); 2496