1 /* 2 * Copyright (c) 2007-2014 Nicira, Inc. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of version 2 of the GNU General Public 6 * License as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 * General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program; if not, write to the Free Software 15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 16 * 02110-1301, USA 17 */ 18 19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 20 21 #include <linux/init.h> 22 #include <linux/module.h> 23 #include <linux/if_arp.h> 24 #include <linux/if_vlan.h> 25 #include <linux/in.h> 26 #include <linux/ip.h> 27 #include <linux/jhash.h> 28 #include <linux/delay.h> 29 #include <linux/time.h> 30 #include <linux/etherdevice.h> 31 #include <linux/genetlink.h> 32 #include <linux/kernel.h> 33 #include <linux/kthread.h> 34 #include <linux/mutex.h> 35 #include <linux/percpu.h> 36 #include <linux/rcupdate.h> 37 #include <linux/tcp.h> 38 #include <linux/udp.h> 39 #include <linux/ethtool.h> 40 #include <linux/wait.h> 41 #include <asm/div64.h> 42 #include <linux/highmem.h> 43 #include <linux/netfilter_bridge.h> 44 #include <linux/netfilter_ipv4.h> 45 #include <linux/inetdevice.h> 46 #include <linux/list.h> 47 #include <linux/openvswitch.h> 48 #include <linux/rculist.h> 49 #include <linux/dmi.h> 50 #include <net/genetlink.h> 51 #include <net/net_namespace.h> 52 #include <net/netns/generic.h> 53 54 #include "datapath.h" 55 #include "flow.h" 56 #include "flow_table.h" 57 #include "flow_netlink.h" 58 #include "vport-internal_dev.h" 59 #include "vport-netdev.h" 60 61 unsigned int ovs_net_id __read_mostly; 62 63 static struct genl_family dp_packet_genl_family; 64 static struct genl_family dp_flow_genl_family; 65 static struct genl_family dp_datapath_genl_family; 66 67 static const struct nla_policy flow_policy[]; 68 69 static const struct genl_multicast_group ovs_dp_flow_multicast_group = { 70 .name = OVS_FLOW_MCGROUP, 71 }; 72 73 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = { 74 .name = OVS_DATAPATH_MCGROUP, 75 }; 76 77 static const struct genl_multicast_group ovs_dp_vport_multicast_group = { 78 .name = OVS_VPORT_MCGROUP, 79 }; 80 81 /* Check if need to build a reply message. 82 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */ 83 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info, 84 unsigned int group) 85 { 86 return info->nlhdr->nlmsg_flags & NLM_F_ECHO || 87 genl_has_listeners(family, genl_info_net(info), group); 88 } 89 90 static void ovs_notify(struct genl_family *family, 91 struct sk_buff *skb, struct genl_info *info) 92 { 93 genl_notify(family, skb, info, 0, GFP_KERNEL); 94 } 95 96 /** 97 * DOC: Locking: 98 * 99 * All writes e.g. Writes to device state (add/remove datapath, port, set 100 * operations on vports, etc.), Writes to other state (flow table 101 * modifications, set miscellaneous datapath parameters, etc.) are protected 102 * by ovs_lock. 103 * 104 * Reads are protected by RCU. 105 * 106 * There are a few special cases (mostly stats) that have their own 107 * synchronization but they nest under all of above and don't interact with 108 * each other. 109 * 110 * The RTNL lock nests inside ovs_mutex. 111 */ 112 113 static DEFINE_MUTEX(ovs_mutex); 114 115 void ovs_lock(void) 116 { 117 mutex_lock(&ovs_mutex); 118 } 119 120 void ovs_unlock(void) 121 { 122 mutex_unlock(&ovs_mutex); 123 } 124 125 #ifdef CONFIG_LOCKDEP 126 int lockdep_ovsl_is_held(void) 127 { 128 if (debug_locks) 129 return lockdep_is_held(&ovs_mutex); 130 else 131 return 1; 132 } 133 #endif 134 135 static struct vport *new_vport(const struct vport_parms *); 136 static int queue_gso_packets(struct datapath *dp, struct sk_buff *, 137 const struct sw_flow_key *, 138 const struct dp_upcall_info *, 139 uint32_t cutlen); 140 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *, 141 const struct sw_flow_key *, 142 const struct dp_upcall_info *, 143 uint32_t cutlen); 144 145 /* Must be called with rcu_read_lock. */ 146 static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex) 147 { 148 struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex); 149 150 if (dev) { 151 struct vport *vport = ovs_internal_dev_get_vport(dev); 152 if (vport) 153 return vport->dp; 154 } 155 156 return NULL; 157 } 158 159 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the 160 * returned dp pointer valid. 161 */ 162 static inline struct datapath *get_dp(struct net *net, int dp_ifindex) 163 { 164 struct datapath *dp; 165 166 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); 167 rcu_read_lock(); 168 dp = get_dp_rcu(net, dp_ifindex); 169 rcu_read_unlock(); 170 171 return dp; 172 } 173 174 /* Must be called with rcu_read_lock or ovs_mutex. */ 175 const char *ovs_dp_name(const struct datapath *dp) 176 { 177 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); 178 return ovs_vport_name(vport); 179 } 180 181 static int get_dpifindex(const struct datapath *dp) 182 { 183 struct vport *local; 184 int ifindex; 185 186 rcu_read_lock(); 187 188 local = ovs_vport_rcu(dp, OVSP_LOCAL); 189 if (local) 190 ifindex = local->dev->ifindex; 191 else 192 ifindex = 0; 193 194 rcu_read_unlock(); 195 196 return ifindex; 197 } 198 199 static void destroy_dp_rcu(struct rcu_head *rcu) 200 { 201 struct datapath *dp = container_of(rcu, struct datapath, rcu); 202 203 ovs_flow_tbl_destroy(&dp->table); 204 free_percpu(dp->stats_percpu); 205 kfree(dp->ports); 206 kfree(dp); 207 } 208 209 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 210 u16 port_no) 211 { 212 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 213 } 214 215 /* Called with ovs_mutex or RCU read lock. */ 216 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 217 { 218 struct vport *vport; 219 struct hlist_head *head; 220 221 head = vport_hash_bucket(dp, port_no); 222 hlist_for_each_entry_rcu(vport, head, dp_hash_node) { 223 if (vport->port_no == port_no) 224 return vport; 225 } 226 return NULL; 227 } 228 229 /* Called with ovs_mutex. */ 230 static struct vport *new_vport(const struct vport_parms *parms) 231 { 232 struct vport *vport; 233 234 vport = ovs_vport_add(parms); 235 if (!IS_ERR(vport)) { 236 struct datapath *dp = parms->dp; 237 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 238 239 hlist_add_head_rcu(&vport->dp_hash_node, head); 240 } 241 return vport; 242 } 243 244 void ovs_dp_detach_port(struct vport *p) 245 { 246 ASSERT_OVSL(); 247 248 /* First drop references to device. */ 249 hlist_del_rcu(&p->dp_hash_node); 250 251 /* Then destroy it. */ 252 ovs_vport_del(p); 253 } 254 255 /* Must be called with rcu_read_lock. */ 256 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key) 257 { 258 const struct vport *p = OVS_CB(skb)->input_vport; 259 struct datapath *dp = p->dp; 260 struct sw_flow *flow; 261 struct sw_flow_actions *sf_acts; 262 struct dp_stats_percpu *stats; 263 u64 *stats_counter; 264 u32 n_mask_hit; 265 266 stats = this_cpu_ptr(dp->stats_percpu); 267 268 /* Look up flow. */ 269 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit); 270 if (unlikely(!flow)) { 271 struct dp_upcall_info upcall; 272 int error; 273 274 memset(&upcall, 0, sizeof(upcall)); 275 upcall.cmd = OVS_PACKET_CMD_MISS; 276 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 277 upcall.mru = OVS_CB(skb)->mru; 278 error = ovs_dp_upcall(dp, skb, key, &upcall, 0); 279 if (unlikely(error)) 280 kfree_skb(skb); 281 else 282 consume_skb(skb); 283 stats_counter = &stats->n_missed; 284 goto out; 285 } 286 287 ovs_flow_stats_update(flow, key->tp.flags, skb); 288 sf_acts = rcu_dereference(flow->sf_acts); 289 ovs_execute_actions(dp, skb, sf_acts, key); 290 291 stats_counter = &stats->n_hit; 292 293 out: 294 /* Update datapath statistics. */ 295 u64_stats_update_begin(&stats->syncp); 296 (*stats_counter)++; 297 stats->n_mask_hit += n_mask_hit; 298 u64_stats_update_end(&stats->syncp); 299 } 300 301 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 302 const struct sw_flow_key *key, 303 const struct dp_upcall_info *upcall_info, 304 uint32_t cutlen) 305 { 306 struct dp_stats_percpu *stats; 307 int err; 308 309 if (upcall_info->portid == 0) { 310 err = -ENOTCONN; 311 goto err; 312 } 313 314 if (!skb_is_gso(skb)) 315 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 316 else 317 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen); 318 if (err) 319 goto err; 320 321 return 0; 322 323 err: 324 stats = this_cpu_ptr(dp->stats_percpu); 325 326 u64_stats_update_begin(&stats->syncp); 327 stats->n_lost++; 328 u64_stats_update_end(&stats->syncp); 329 330 return err; 331 } 332 333 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 334 const struct sw_flow_key *key, 335 const struct dp_upcall_info *upcall_info, 336 uint32_t cutlen) 337 { 338 unsigned short gso_type = skb_shinfo(skb)->gso_type; 339 struct sw_flow_key later_key; 340 struct sk_buff *segs, *nskb; 341 int err; 342 343 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET); 344 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 345 if (IS_ERR(segs)) 346 return PTR_ERR(segs); 347 if (segs == NULL) 348 return -EINVAL; 349 350 if (gso_type & SKB_GSO_UDP) { 351 /* The initial flow key extracted by ovs_flow_key_extract() 352 * in this case is for a first fragment, so we need to 353 * properly mark later fragments. 354 */ 355 later_key = *key; 356 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 357 } 358 359 /* Queue all of the segments. */ 360 skb = segs; 361 do { 362 if (gso_type & SKB_GSO_UDP && skb != segs) 363 key = &later_key; 364 365 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 366 if (err) 367 break; 368 369 } while ((skb = skb->next)); 370 371 /* Free all of the segments. */ 372 skb = segs; 373 do { 374 nskb = skb->next; 375 if (err) 376 kfree_skb(skb); 377 else 378 consume_skb(skb); 379 } while ((skb = nskb)); 380 return err; 381 } 382 383 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, 384 unsigned int hdrlen) 385 { 386 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 387 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 388 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */ 389 + nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */ 390 391 /* OVS_PACKET_ATTR_USERDATA */ 392 if (upcall_info->userdata) 393 size += NLA_ALIGN(upcall_info->userdata->nla_len); 394 395 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ 396 if (upcall_info->egress_tun_info) 397 size += nla_total_size(ovs_tun_key_attr_size()); 398 399 /* OVS_PACKET_ATTR_ACTIONS */ 400 if (upcall_info->actions_len) 401 size += nla_total_size(upcall_info->actions_len); 402 403 /* OVS_PACKET_ATTR_MRU */ 404 if (upcall_info->mru) 405 size += nla_total_size(sizeof(upcall_info->mru)); 406 407 return size; 408 } 409 410 static void pad_packet(struct datapath *dp, struct sk_buff *skb) 411 { 412 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 413 size_t plen = NLA_ALIGN(skb->len) - skb->len; 414 415 if (plen > 0) 416 memset(skb_put(skb, plen), 0, plen); 417 } 418 } 419 420 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 421 const struct sw_flow_key *key, 422 const struct dp_upcall_info *upcall_info, 423 uint32_t cutlen) 424 { 425 struct ovs_header *upcall; 426 struct sk_buff *nskb = NULL; 427 struct sk_buff *user_skb = NULL; /* to be queued to userspace */ 428 struct nlattr *nla; 429 size_t len; 430 unsigned int hlen; 431 int err, dp_ifindex; 432 433 dp_ifindex = get_dpifindex(dp); 434 if (!dp_ifindex) 435 return -ENODEV; 436 437 if (skb_vlan_tag_present(skb)) { 438 nskb = skb_clone(skb, GFP_ATOMIC); 439 if (!nskb) 440 return -ENOMEM; 441 442 nskb = __vlan_hwaccel_push_inside(nskb); 443 if (!nskb) 444 return -ENOMEM; 445 446 skb = nskb; 447 } 448 449 if (nla_attr_size(skb->len) > USHRT_MAX) { 450 err = -EFBIG; 451 goto out; 452 } 453 454 /* Complete checksum if needed */ 455 if (skb->ip_summed == CHECKSUM_PARTIAL && 456 (err = skb_checksum_help(skb))) 457 goto out; 458 459 /* Older versions of OVS user space enforce alignment of the last 460 * Netlink attribute to NLA_ALIGNTO which would require extensive 461 * padding logic. Only perform zerocopy if padding is not required. 462 */ 463 if (dp->user_features & OVS_DP_F_UNALIGNED) 464 hlen = skb_zerocopy_headlen(skb); 465 else 466 hlen = skb->len; 467 468 len = upcall_msg_size(upcall_info, hlen - cutlen); 469 user_skb = genlmsg_new(len, GFP_ATOMIC); 470 if (!user_skb) { 471 err = -ENOMEM; 472 goto out; 473 } 474 475 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 476 0, upcall_info->cmd); 477 upcall->dp_ifindex = dp_ifindex; 478 479 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); 480 BUG_ON(err); 481 482 if (upcall_info->userdata) 483 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 484 nla_len(upcall_info->userdata), 485 nla_data(upcall_info->userdata)); 486 487 if (upcall_info->egress_tun_info) { 488 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY); 489 err = ovs_nla_put_tunnel_info(user_skb, 490 upcall_info->egress_tun_info); 491 BUG_ON(err); 492 nla_nest_end(user_skb, nla); 493 } 494 495 if (upcall_info->actions_len) { 496 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS); 497 err = ovs_nla_put_actions(upcall_info->actions, 498 upcall_info->actions_len, 499 user_skb); 500 if (!err) 501 nla_nest_end(user_skb, nla); 502 else 503 nla_nest_cancel(user_skb, nla); 504 } 505 506 /* Add OVS_PACKET_ATTR_MRU */ 507 if (upcall_info->mru) { 508 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, 509 upcall_info->mru)) { 510 err = -ENOBUFS; 511 goto out; 512 } 513 pad_packet(dp, user_skb); 514 } 515 516 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */ 517 if (cutlen > 0) { 518 if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, 519 skb->len)) { 520 err = -ENOBUFS; 521 goto out; 522 } 523 pad_packet(dp, user_skb); 524 } 525 526 /* Only reserve room for attribute header, packet data is added 527 * in skb_zerocopy() */ 528 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 529 err = -ENOBUFS; 530 goto out; 531 } 532 nla->nla_len = nla_attr_size(skb->len - cutlen); 533 534 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen); 535 if (err) 536 goto out; 537 538 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 539 pad_packet(dp, user_skb); 540 541 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 542 543 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 544 user_skb = NULL; 545 out: 546 if (err) 547 skb_tx_error(skb); 548 kfree_skb(user_skb); 549 kfree_skb(nskb); 550 return err; 551 } 552 553 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 554 { 555 struct ovs_header *ovs_header = info->userhdr; 556 struct net *net = sock_net(skb->sk); 557 struct nlattr **a = info->attrs; 558 struct sw_flow_actions *acts; 559 struct sk_buff *packet; 560 struct sw_flow *flow; 561 struct sw_flow_actions *sf_acts; 562 struct datapath *dp; 563 struct vport *input_vport; 564 u16 mru = 0; 565 int len; 566 int err; 567 bool log = !a[OVS_PACKET_ATTR_PROBE]; 568 569 err = -EINVAL; 570 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 571 !a[OVS_PACKET_ATTR_ACTIONS]) 572 goto err; 573 574 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 575 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 576 err = -ENOMEM; 577 if (!packet) 578 goto err; 579 skb_reserve(packet, NET_IP_ALIGN); 580 581 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 582 583 /* Set packet's mru */ 584 if (a[OVS_PACKET_ATTR_MRU]) { 585 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]); 586 packet->ignore_df = 1; 587 } 588 OVS_CB(packet)->mru = mru; 589 590 /* Build an sw_flow for sending this packet. */ 591 flow = ovs_flow_alloc(); 592 err = PTR_ERR(flow); 593 if (IS_ERR(flow)) 594 goto err_kfree_skb; 595 596 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY], 597 packet, &flow->key, log); 598 if (err) 599 goto err_flow_free; 600 601 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS], 602 &flow->key, &acts, log); 603 if (err) 604 goto err_flow_free; 605 606 rcu_assign_pointer(flow->sf_acts, acts); 607 packet->priority = flow->key.phy.priority; 608 packet->mark = flow->key.phy.skb_mark; 609 610 rcu_read_lock(); 611 dp = get_dp_rcu(net, ovs_header->dp_ifindex); 612 err = -ENODEV; 613 if (!dp) 614 goto err_unlock; 615 616 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 617 if (!input_vport) 618 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 619 620 if (!input_vport) 621 goto err_unlock; 622 623 packet->dev = input_vport->dev; 624 OVS_CB(packet)->input_vport = input_vport; 625 sf_acts = rcu_dereference(flow->sf_acts); 626 627 local_bh_disable(); 628 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); 629 local_bh_enable(); 630 rcu_read_unlock(); 631 632 ovs_flow_free(flow, false); 633 return err; 634 635 err_unlock: 636 rcu_read_unlock(); 637 err_flow_free: 638 ovs_flow_free(flow, false); 639 err_kfree_skb: 640 kfree_skb(packet); 641 err: 642 return err; 643 } 644 645 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 646 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 647 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 648 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 649 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, 650 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, 651 }; 652 653 static const struct genl_ops dp_packet_genl_ops[] = { 654 { .cmd = OVS_PACKET_CMD_EXECUTE, 655 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 656 .policy = packet_policy, 657 .doit = ovs_packet_cmd_execute 658 } 659 }; 660 661 static struct genl_family dp_packet_genl_family __ro_after_init = { 662 .hdrsize = sizeof(struct ovs_header), 663 .name = OVS_PACKET_FAMILY, 664 .version = OVS_PACKET_VERSION, 665 .maxattr = OVS_PACKET_ATTR_MAX, 666 .netnsok = true, 667 .parallel_ops = true, 668 .ops = dp_packet_genl_ops, 669 .n_ops = ARRAY_SIZE(dp_packet_genl_ops), 670 .module = THIS_MODULE, 671 }; 672 673 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 674 struct ovs_dp_megaflow_stats *mega_stats) 675 { 676 int i; 677 678 memset(mega_stats, 0, sizeof(*mega_stats)); 679 680 stats->n_flows = ovs_flow_tbl_count(&dp->table); 681 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 682 683 stats->n_hit = stats->n_missed = stats->n_lost = 0; 684 685 for_each_possible_cpu(i) { 686 const struct dp_stats_percpu *percpu_stats; 687 struct dp_stats_percpu local_stats; 688 unsigned int start; 689 690 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 691 692 do { 693 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 694 local_stats = *percpu_stats; 695 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 696 697 stats->n_hit += local_stats.n_hit; 698 stats->n_missed += local_stats.n_missed; 699 stats->n_lost += local_stats.n_lost; 700 mega_stats->n_mask_hit += local_stats.n_mask_hit; 701 } 702 } 703 704 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) 705 { 706 return ovs_identifier_is_ufid(sfid) && 707 !(ufid_flags & OVS_UFID_F_OMIT_KEY); 708 } 709 710 static bool should_fill_mask(uint32_t ufid_flags) 711 { 712 return !(ufid_flags & OVS_UFID_F_OMIT_MASK); 713 } 714 715 static bool should_fill_actions(uint32_t ufid_flags) 716 { 717 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); 718 } 719 720 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, 721 const struct sw_flow_id *sfid, 722 uint32_t ufid_flags) 723 { 724 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); 725 726 /* OVS_FLOW_ATTR_UFID */ 727 if (sfid && ovs_identifier_is_ufid(sfid)) 728 len += nla_total_size(sfid->ufid_len); 729 730 /* OVS_FLOW_ATTR_KEY */ 731 if (!sfid || should_fill_key(sfid, ufid_flags)) 732 len += nla_total_size(ovs_key_attr_size()); 733 734 /* OVS_FLOW_ATTR_MASK */ 735 if (should_fill_mask(ufid_flags)) 736 len += nla_total_size(ovs_key_attr_size()); 737 738 /* OVS_FLOW_ATTR_ACTIONS */ 739 if (should_fill_actions(ufid_flags)) 740 len += nla_total_size(acts->orig_len); 741 742 return len 743 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 744 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 745 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */ 746 } 747 748 /* Called with ovs_mutex or RCU read lock. */ 749 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 750 struct sk_buff *skb) 751 { 752 struct ovs_flow_stats stats; 753 __be16 tcp_flags; 754 unsigned long used; 755 756 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 757 758 if (used && 759 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used), 760 OVS_FLOW_ATTR_PAD)) 761 return -EMSGSIZE; 762 763 if (stats.n_packets && 764 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS, 765 sizeof(struct ovs_flow_stats), &stats, 766 OVS_FLOW_ATTR_PAD)) 767 return -EMSGSIZE; 768 769 if ((u8)ntohs(tcp_flags) && 770 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 771 return -EMSGSIZE; 772 773 return 0; 774 } 775 776 /* Called with ovs_mutex or RCU read lock. */ 777 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 778 struct sk_buff *skb, int skb_orig_len) 779 { 780 struct nlattr *start; 781 int err; 782 783 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 784 * this is the first flow to be dumped into 'skb'. This is unusual for 785 * Netlink but individual action lists can be longer than 786 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 787 * The userspace caller can always fetch the actions separately if it 788 * really wants them. (Most userspace callers in fact don't care.) 789 * 790 * This can only fail for dump operations because the skb is always 791 * properly sized for single flows. 792 */ 793 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS); 794 if (start) { 795 const struct sw_flow_actions *sf_acts; 796 797 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 798 err = ovs_nla_put_actions(sf_acts->actions, 799 sf_acts->actions_len, skb); 800 801 if (!err) 802 nla_nest_end(skb, start); 803 else { 804 if (skb_orig_len) 805 return err; 806 807 nla_nest_cancel(skb, start); 808 } 809 } else if (skb_orig_len) { 810 return -EMSGSIZE; 811 } 812 813 return 0; 814 } 815 816 /* Called with ovs_mutex or RCU read lock. */ 817 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 818 struct sk_buff *skb, u32 portid, 819 u32 seq, u32 flags, u8 cmd, u32 ufid_flags) 820 { 821 const int skb_orig_len = skb->len; 822 struct ovs_header *ovs_header; 823 int err; 824 825 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 826 flags, cmd); 827 if (!ovs_header) 828 return -EMSGSIZE; 829 830 ovs_header->dp_ifindex = dp_ifindex; 831 832 err = ovs_nla_put_identifier(flow, skb); 833 if (err) 834 goto error; 835 836 if (should_fill_key(&flow->id, ufid_flags)) { 837 err = ovs_nla_put_masked_key(flow, skb); 838 if (err) 839 goto error; 840 } 841 842 if (should_fill_mask(ufid_flags)) { 843 err = ovs_nla_put_mask(flow, skb); 844 if (err) 845 goto error; 846 } 847 848 err = ovs_flow_cmd_fill_stats(flow, skb); 849 if (err) 850 goto error; 851 852 if (should_fill_actions(ufid_flags)) { 853 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 854 if (err) 855 goto error; 856 } 857 858 genlmsg_end(skb, ovs_header); 859 return 0; 860 861 error: 862 genlmsg_cancel(skb, ovs_header); 863 return err; 864 } 865 866 /* May not be called with RCU read lock. */ 867 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 868 const struct sw_flow_id *sfid, 869 struct genl_info *info, 870 bool always, 871 uint32_t ufid_flags) 872 { 873 struct sk_buff *skb; 874 size_t len; 875 876 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 877 return NULL; 878 879 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); 880 skb = genlmsg_new(len, GFP_KERNEL); 881 if (!skb) 882 return ERR_PTR(-ENOMEM); 883 884 return skb; 885 } 886 887 /* Called with ovs_mutex. */ 888 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 889 int dp_ifindex, 890 struct genl_info *info, u8 cmd, 891 bool always, u32 ufid_flags) 892 { 893 struct sk_buff *skb; 894 int retval; 895 896 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), 897 &flow->id, info, always, ufid_flags); 898 if (IS_ERR_OR_NULL(skb)) 899 return skb; 900 901 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 902 info->snd_portid, info->snd_seq, 0, 903 cmd, ufid_flags); 904 BUG_ON(retval < 0); 905 return skb; 906 } 907 908 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 909 { 910 struct net *net = sock_net(skb->sk); 911 struct nlattr **a = info->attrs; 912 struct ovs_header *ovs_header = info->userhdr; 913 struct sw_flow *flow = NULL, *new_flow; 914 struct sw_flow_mask mask; 915 struct sk_buff *reply; 916 struct datapath *dp; 917 struct sw_flow_actions *acts; 918 struct sw_flow_match match; 919 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 920 int error; 921 bool log = !a[OVS_FLOW_ATTR_PROBE]; 922 923 /* Must have key and actions. */ 924 error = -EINVAL; 925 if (!a[OVS_FLOW_ATTR_KEY]) { 926 OVS_NLERR(log, "Flow key attr not present in new flow."); 927 goto error; 928 } 929 if (!a[OVS_FLOW_ATTR_ACTIONS]) { 930 OVS_NLERR(log, "Flow actions attr not present in new flow."); 931 goto error; 932 } 933 934 /* Most of the time we need to allocate a new flow, do it before 935 * locking. 936 */ 937 new_flow = ovs_flow_alloc(); 938 if (IS_ERR(new_flow)) { 939 error = PTR_ERR(new_flow); 940 goto error; 941 } 942 943 /* Extract key. */ 944 ovs_match_init(&match, &new_flow->key, false, &mask); 945 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 946 a[OVS_FLOW_ATTR_MASK], log); 947 if (error) 948 goto err_kfree_flow; 949 950 /* Extract flow identifier. */ 951 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID], 952 &new_flow->key, log); 953 if (error) 954 goto err_kfree_flow; 955 956 /* unmasked key is needed to match when ufid is not used. */ 957 if (ovs_identifier_is_key(&new_flow->id)) 958 match.key = new_flow->id.unmasked_key; 959 960 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask); 961 962 /* Validate actions. */ 963 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS], 964 &new_flow->key, &acts, log); 965 if (error) { 966 OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); 967 goto err_kfree_flow; 968 } 969 970 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false, 971 ufid_flags); 972 if (IS_ERR(reply)) { 973 error = PTR_ERR(reply); 974 goto err_kfree_acts; 975 } 976 977 ovs_lock(); 978 dp = get_dp(net, ovs_header->dp_ifindex); 979 if (unlikely(!dp)) { 980 error = -ENODEV; 981 goto err_unlock_ovs; 982 } 983 984 /* Check if this is a duplicate flow */ 985 if (ovs_identifier_is_ufid(&new_flow->id)) 986 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id); 987 if (!flow) 988 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key); 989 if (likely(!flow)) { 990 rcu_assign_pointer(new_flow->sf_acts, acts); 991 992 /* Put flow in bucket. */ 993 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 994 if (unlikely(error)) { 995 acts = NULL; 996 goto err_unlock_ovs; 997 } 998 999 if (unlikely(reply)) { 1000 error = ovs_flow_cmd_fill_info(new_flow, 1001 ovs_header->dp_ifindex, 1002 reply, info->snd_portid, 1003 info->snd_seq, 0, 1004 OVS_FLOW_CMD_NEW, 1005 ufid_flags); 1006 BUG_ON(error < 0); 1007 } 1008 ovs_unlock(); 1009 } else { 1010 struct sw_flow_actions *old_acts; 1011 1012 /* Bail out if we're not allowed to modify an existing flow. 1013 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 1014 * because Generic Netlink treats the latter as a dump 1015 * request. We also accept NLM_F_EXCL in case that bug ever 1016 * gets fixed. 1017 */ 1018 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 1019 | NLM_F_EXCL))) { 1020 error = -EEXIST; 1021 goto err_unlock_ovs; 1022 } 1023 /* The flow identifier has to be the same for flow updates. 1024 * Look for any overlapping flow. 1025 */ 1026 if (unlikely(!ovs_flow_cmp(flow, &match))) { 1027 if (ovs_identifier_is_key(&flow->id)) 1028 flow = ovs_flow_tbl_lookup_exact(&dp->table, 1029 &match); 1030 else /* UFID matches but key is different */ 1031 flow = NULL; 1032 if (!flow) { 1033 error = -ENOENT; 1034 goto err_unlock_ovs; 1035 } 1036 } 1037 /* Update actions. */ 1038 old_acts = ovsl_dereference(flow->sf_acts); 1039 rcu_assign_pointer(flow->sf_acts, acts); 1040 1041 if (unlikely(reply)) { 1042 error = ovs_flow_cmd_fill_info(flow, 1043 ovs_header->dp_ifindex, 1044 reply, info->snd_portid, 1045 info->snd_seq, 0, 1046 OVS_FLOW_CMD_NEW, 1047 ufid_flags); 1048 BUG_ON(error < 0); 1049 } 1050 ovs_unlock(); 1051 1052 ovs_nla_free_flow_actions_rcu(old_acts); 1053 ovs_flow_free(new_flow, false); 1054 } 1055 1056 if (reply) 1057 ovs_notify(&dp_flow_genl_family, reply, info); 1058 return 0; 1059 1060 err_unlock_ovs: 1061 ovs_unlock(); 1062 kfree_skb(reply); 1063 err_kfree_acts: 1064 ovs_nla_free_flow_actions(acts); 1065 err_kfree_flow: 1066 ovs_flow_free(new_flow, false); 1067 error: 1068 return error; 1069 } 1070 1071 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ 1072 static struct sw_flow_actions *get_flow_actions(struct net *net, 1073 const struct nlattr *a, 1074 const struct sw_flow_key *key, 1075 const struct sw_flow_mask *mask, 1076 bool log) 1077 { 1078 struct sw_flow_actions *acts; 1079 struct sw_flow_key masked_key; 1080 int error; 1081 1082 ovs_flow_mask_key(&masked_key, key, true, mask); 1083 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log); 1084 if (error) { 1085 OVS_NLERR(log, 1086 "Actions may not be safe on all matching packets"); 1087 return ERR_PTR(error); 1088 } 1089 1090 return acts; 1091 } 1092 1093 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 1094 { 1095 struct net *net = sock_net(skb->sk); 1096 struct nlattr **a = info->attrs; 1097 struct ovs_header *ovs_header = info->userhdr; 1098 struct sw_flow_key key; 1099 struct sw_flow *flow; 1100 struct sw_flow_mask mask; 1101 struct sk_buff *reply = NULL; 1102 struct datapath *dp; 1103 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 1104 struct sw_flow_match match; 1105 struct sw_flow_id sfid; 1106 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1107 int error = 0; 1108 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1109 bool ufid_present; 1110 1111 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); 1112 if (a[OVS_FLOW_ATTR_KEY]) { 1113 ovs_match_init(&match, &key, true, &mask); 1114 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1115 a[OVS_FLOW_ATTR_MASK], log); 1116 } else if (!ufid_present) { 1117 OVS_NLERR(log, 1118 "Flow set message rejected, Key attribute missing."); 1119 error = -EINVAL; 1120 } 1121 if (error) 1122 goto error; 1123 1124 /* Validate actions. */ 1125 if (a[OVS_FLOW_ATTR_ACTIONS]) { 1126 if (!a[OVS_FLOW_ATTR_KEY]) { 1127 OVS_NLERR(log, 1128 "Flow key attribute not present in set flow."); 1129 error = -EINVAL; 1130 goto error; 1131 } 1132 1133 acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key, 1134 &mask, log); 1135 if (IS_ERR(acts)) { 1136 error = PTR_ERR(acts); 1137 goto error; 1138 } 1139 1140 /* Can allocate before locking if have acts. */ 1141 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false, 1142 ufid_flags); 1143 if (IS_ERR(reply)) { 1144 error = PTR_ERR(reply); 1145 goto err_kfree_acts; 1146 } 1147 } 1148 1149 ovs_lock(); 1150 dp = get_dp(net, ovs_header->dp_ifindex); 1151 if (unlikely(!dp)) { 1152 error = -ENODEV; 1153 goto err_unlock_ovs; 1154 } 1155 /* Check that the flow exists. */ 1156 if (ufid_present) 1157 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid); 1158 else 1159 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1160 if (unlikely(!flow)) { 1161 error = -ENOENT; 1162 goto err_unlock_ovs; 1163 } 1164 1165 /* Update actions, if present. */ 1166 if (likely(acts)) { 1167 old_acts = ovsl_dereference(flow->sf_acts); 1168 rcu_assign_pointer(flow->sf_acts, acts); 1169 1170 if (unlikely(reply)) { 1171 error = ovs_flow_cmd_fill_info(flow, 1172 ovs_header->dp_ifindex, 1173 reply, info->snd_portid, 1174 info->snd_seq, 0, 1175 OVS_FLOW_CMD_NEW, 1176 ufid_flags); 1177 BUG_ON(error < 0); 1178 } 1179 } else { 1180 /* Could not alloc without acts before locking. */ 1181 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1182 info, OVS_FLOW_CMD_NEW, false, 1183 ufid_flags); 1184 1185 if (IS_ERR(reply)) { 1186 error = PTR_ERR(reply); 1187 goto err_unlock_ovs; 1188 } 1189 } 1190 1191 /* Clear stats. */ 1192 if (a[OVS_FLOW_ATTR_CLEAR]) 1193 ovs_flow_stats_clear(flow); 1194 ovs_unlock(); 1195 1196 if (reply) 1197 ovs_notify(&dp_flow_genl_family, reply, info); 1198 if (old_acts) 1199 ovs_nla_free_flow_actions_rcu(old_acts); 1200 1201 return 0; 1202 1203 err_unlock_ovs: 1204 ovs_unlock(); 1205 kfree_skb(reply); 1206 err_kfree_acts: 1207 ovs_nla_free_flow_actions(acts); 1208 error: 1209 return error; 1210 } 1211 1212 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1213 { 1214 struct nlattr **a = info->attrs; 1215 struct ovs_header *ovs_header = info->userhdr; 1216 struct net *net = sock_net(skb->sk); 1217 struct sw_flow_key key; 1218 struct sk_buff *reply; 1219 struct sw_flow *flow; 1220 struct datapath *dp; 1221 struct sw_flow_match match; 1222 struct sw_flow_id ufid; 1223 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1224 int err = 0; 1225 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1226 bool ufid_present; 1227 1228 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1229 if (a[OVS_FLOW_ATTR_KEY]) { 1230 ovs_match_init(&match, &key, true, NULL); 1231 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL, 1232 log); 1233 } else if (!ufid_present) { 1234 OVS_NLERR(log, 1235 "Flow get message rejected, Key attribute missing."); 1236 err = -EINVAL; 1237 } 1238 if (err) 1239 return err; 1240 1241 ovs_lock(); 1242 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1243 if (!dp) { 1244 err = -ENODEV; 1245 goto unlock; 1246 } 1247 1248 if (ufid_present) 1249 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1250 else 1251 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1252 if (!flow) { 1253 err = -ENOENT; 1254 goto unlock; 1255 } 1256 1257 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1258 OVS_FLOW_CMD_NEW, true, ufid_flags); 1259 if (IS_ERR(reply)) { 1260 err = PTR_ERR(reply); 1261 goto unlock; 1262 } 1263 1264 ovs_unlock(); 1265 return genlmsg_reply(reply, info); 1266 unlock: 1267 ovs_unlock(); 1268 return err; 1269 } 1270 1271 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1272 { 1273 struct nlattr **a = info->attrs; 1274 struct ovs_header *ovs_header = info->userhdr; 1275 struct net *net = sock_net(skb->sk); 1276 struct sw_flow_key key; 1277 struct sk_buff *reply; 1278 struct sw_flow *flow = NULL; 1279 struct datapath *dp; 1280 struct sw_flow_match match; 1281 struct sw_flow_id ufid; 1282 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1283 int err; 1284 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1285 bool ufid_present; 1286 1287 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1288 if (a[OVS_FLOW_ATTR_KEY]) { 1289 ovs_match_init(&match, &key, true, NULL); 1290 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1291 NULL, log); 1292 if (unlikely(err)) 1293 return err; 1294 } 1295 1296 ovs_lock(); 1297 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1298 if (unlikely(!dp)) { 1299 err = -ENODEV; 1300 goto unlock; 1301 } 1302 1303 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) { 1304 err = ovs_flow_tbl_flush(&dp->table); 1305 goto unlock; 1306 } 1307 1308 if (ufid_present) 1309 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1310 else 1311 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1312 if (unlikely(!flow)) { 1313 err = -ENOENT; 1314 goto unlock; 1315 } 1316 1317 ovs_flow_tbl_remove(&dp->table, flow); 1318 ovs_unlock(); 1319 1320 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1321 &flow->id, info, false, ufid_flags); 1322 if (likely(reply)) { 1323 if (likely(!IS_ERR(reply))) { 1324 rcu_read_lock(); /*To keep RCU checker happy. */ 1325 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1326 reply, info->snd_portid, 1327 info->snd_seq, 0, 1328 OVS_FLOW_CMD_DEL, 1329 ufid_flags); 1330 rcu_read_unlock(); 1331 BUG_ON(err < 0); 1332 1333 ovs_notify(&dp_flow_genl_family, reply, info); 1334 } else { 1335 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply)); 1336 } 1337 } 1338 1339 ovs_flow_free(flow, true); 1340 return 0; 1341 unlock: 1342 ovs_unlock(); 1343 return err; 1344 } 1345 1346 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1347 { 1348 struct nlattr *a[__OVS_FLOW_ATTR_MAX]; 1349 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1350 struct table_instance *ti; 1351 struct datapath *dp; 1352 u32 ufid_flags; 1353 int err; 1354 1355 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a, 1356 OVS_FLOW_ATTR_MAX, flow_policy); 1357 if (err) 1358 return err; 1359 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1360 1361 rcu_read_lock(); 1362 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1363 if (!dp) { 1364 rcu_read_unlock(); 1365 return -ENODEV; 1366 } 1367 1368 ti = rcu_dereference(dp->table.ti); 1369 for (;;) { 1370 struct sw_flow *flow; 1371 u32 bucket, obj; 1372 1373 bucket = cb->args[0]; 1374 obj = cb->args[1]; 1375 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1376 if (!flow) 1377 break; 1378 1379 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1380 NETLINK_CB(cb->skb).portid, 1381 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1382 OVS_FLOW_CMD_NEW, ufid_flags) < 0) 1383 break; 1384 1385 cb->args[0] = bucket; 1386 cb->args[1] = obj; 1387 } 1388 rcu_read_unlock(); 1389 return skb->len; 1390 } 1391 1392 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1393 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1394 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1395 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1396 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1397 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1398 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, 1399 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, 1400 }; 1401 1402 static const struct genl_ops dp_flow_genl_ops[] = { 1403 { .cmd = OVS_FLOW_CMD_NEW, 1404 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1405 .policy = flow_policy, 1406 .doit = ovs_flow_cmd_new 1407 }, 1408 { .cmd = OVS_FLOW_CMD_DEL, 1409 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1410 .policy = flow_policy, 1411 .doit = ovs_flow_cmd_del 1412 }, 1413 { .cmd = OVS_FLOW_CMD_GET, 1414 .flags = 0, /* OK for unprivileged users. */ 1415 .policy = flow_policy, 1416 .doit = ovs_flow_cmd_get, 1417 .dumpit = ovs_flow_cmd_dump 1418 }, 1419 { .cmd = OVS_FLOW_CMD_SET, 1420 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1421 .policy = flow_policy, 1422 .doit = ovs_flow_cmd_set, 1423 }, 1424 }; 1425 1426 static struct genl_family dp_flow_genl_family __ro_after_init = { 1427 .hdrsize = sizeof(struct ovs_header), 1428 .name = OVS_FLOW_FAMILY, 1429 .version = OVS_FLOW_VERSION, 1430 .maxattr = OVS_FLOW_ATTR_MAX, 1431 .netnsok = true, 1432 .parallel_ops = true, 1433 .ops = dp_flow_genl_ops, 1434 .n_ops = ARRAY_SIZE(dp_flow_genl_ops), 1435 .mcgrps = &ovs_dp_flow_multicast_group, 1436 .n_mcgrps = 1, 1437 .module = THIS_MODULE, 1438 }; 1439 1440 static size_t ovs_dp_cmd_msg_size(void) 1441 { 1442 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1443 1444 msgsize += nla_total_size(IFNAMSIZ); 1445 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats)); 1446 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats)); 1447 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1448 1449 return msgsize; 1450 } 1451 1452 /* Called with ovs_mutex. */ 1453 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1454 u32 portid, u32 seq, u32 flags, u8 cmd) 1455 { 1456 struct ovs_header *ovs_header; 1457 struct ovs_dp_stats dp_stats; 1458 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1459 int err; 1460 1461 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1462 flags, cmd); 1463 if (!ovs_header) 1464 goto error; 1465 1466 ovs_header->dp_ifindex = get_dpifindex(dp); 1467 1468 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1469 if (err) 1470 goto nla_put_failure; 1471 1472 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1473 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1474 &dp_stats, OVS_DP_ATTR_PAD)) 1475 goto nla_put_failure; 1476 1477 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1478 sizeof(struct ovs_dp_megaflow_stats), 1479 &dp_megaflow_stats, OVS_DP_ATTR_PAD)) 1480 goto nla_put_failure; 1481 1482 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1483 goto nla_put_failure; 1484 1485 genlmsg_end(skb, ovs_header); 1486 return 0; 1487 1488 nla_put_failure: 1489 genlmsg_cancel(skb, ovs_header); 1490 error: 1491 return -EMSGSIZE; 1492 } 1493 1494 static struct sk_buff *ovs_dp_cmd_alloc_info(void) 1495 { 1496 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL); 1497 } 1498 1499 /* Called with rcu_read_lock or ovs_mutex. */ 1500 static struct datapath *lookup_datapath(struct net *net, 1501 const struct ovs_header *ovs_header, 1502 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1503 { 1504 struct datapath *dp; 1505 1506 if (!a[OVS_DP_ATTR_NAME]) 1507 dp = get_dp(net, ovs_header->dp_ifindex); 1508 else { 1509 struct vport *vport; 1510 1511 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1512 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1513 } 1514 return dp ? dp : ERR_PTR(-ENODEV); 1515 } 1516 1517 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info) 1518 { 1519 struct datapath *dp; 1520 1521 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1522 if (IS_ERR(dp)) 1523 return; 1524 1525 WARN(dp->user_features, "Dropping previously announced user features\n"); 1526 dp->user_features = 0; 1527 } 1528 1529 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1530 { 1531 if (a[OVS_DP_ATTR_USER_FEATURES]) 1532 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1533 } 1534 1535 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1536 { 1537 struct nlattr **a = info->attrs; 1538 struct vport_parms parms; 1539 struct sk_buff *reply; 1540 struct datapath *dp; 1541 struct vport *vport; 1542 struct ovs_net *ovs_net; 1543 int err, i; 1544 1545 err = -EINVAL; 1546 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1547 goto err; 1548 1549 reply = ovs_dp_cmd_alloc_info(); 1550 if (!reply) 1551 return -ENOMEM; 1552 1553 err = -ENOMEM; 1554 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1555 if (dp == NULL) 1556 goto err_free_reply; 1557 1558 ovs_dp_set_net(dp, sock_net(skb->sk)); 1559 1560 /* Allocate table. */ 1561 err = ovs_flow_tbl_init(&dp->table); 1562 if (err) 1563 goto err_free_dp; 1564 1565 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1566 if (!dp->stats_percpu) { 1567 err = -ENOMEM; 1568 goto err_destroy_table; 1569 } 1570 1571 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head), 1572 GFP_KERNEL); 1573 if (!dp->ports) { 1574 err = -ENOMEM; 1575 goto err_destroy_percpu; 1576 } 1577 1578 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1579 INIT_HLIST_HEAD(&dp->ports[i]); 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_ports_array; 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_ports_array: 1625 ovs_unlock(); 1626 kfree(dp->ports); 1627 err_destroy_percpu: 1628 free_percpu(dp->stats_percpu); 1629 err_destroy_table: 1630 ovs_flow_tbl_destroy(&dp->table); 1631 err_free_dp: 1632 kfree(dp); 1633 err_free_reply: 1634 kfree_skb(reply); 1635 err: 1636 return err; 1637 } 1638 1639 /* Called with ovs_mutex. */ 1640 static void __dp_destroy(struct datapath *dp) 1641 { 1642 int i; 1643 1644 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1645 struct vport *vport; 1646 struct hlist_node *n; 1647 1648 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1649 if (vport->port_no != OVSP_LOCAL) 1650 ovs_dp_detach_port(vport); 1651 } 1652 1653 list_del_rcu(&dp->list_node); 1654 1655 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1656 * all ports in datapath are destroyed first before freeing datapath. 1657 */ 1658 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1659 1660 /* RCU destroy the flow table */ 1661 call_rcu(&dp->rcu, destroy_dp_rcu); 1662 } 1663 1664 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1665 { 1666 struct sk_buff *reply; 1667 struct datapath *dp; 1668 int err; 1669 1670 reply = ovs_dp_cmd_alloc_info(); 1671 if (!reply) 1672 return -ENOMEM; 1673 1674 ovs_lock(); 1675 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1676 err = PTR_ERR(dp); 1677 if (IS_ERR(dp)) 1678 goto err_unlock_free; 1679 1680 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1681 info->snd_seq, 0, OVS_DP_CMD_DEL); 1682 BUG_ON(err < 0); 1683 1684 __dp_destroy(dp); 1685 ovs_unlock(); 1686 1687 ovs_notify(&dp_datapath_genl_family, reply, info); 1688 1689 return 0; 1690 1691 err_unlock_free: 1692 ovs_unlock(); 1693 kfree_skb(reply); 1694 return err; 1695 } 1696 1697 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1698 { 1699 struct sk_buff *reply; 1700 struct datapath *dp; 1701 int err; 1702 1703 reply = ovs_dp_cmd_alloc_info(); 1704 if (!reply) 1705 return -ENOMEM; 1706 1707 ovs_lock(); 1708 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1709 err = PTR_ERR(dp); 1710 if (IS_ERR(dp)) 1711 goto err_unlock_free; 1712 1713 ovs_dp_change(dp, info->attrs); 1714 1715 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1716 info->snd_seq, 0, OVS_DP_CMD_NEW); 1717 BUG_ON(err < 0); 1718 1719 ovs_unlock(); 1720 ovs_notify(&dp_datapath_genl_family, reply, info); 1721 1722 return 0; 1723 1724 err_unlock_free: 1725 ovs_unlock(); 1726 kfree_skb(reply); 1727 return err; 1728 } 1729 1730 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1731 { 1732 struct sk_buff *reply; 1733 struct datapath *dp; 1734 int err; 1735 1736 reply = ovs_dp_cmd_alloc_info(); 1737 if (!reply) 1738 return -ENOMEM; 1739 1740 ovs_lock(); 1741 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1742 if (IS_ERR(dp)) { 1743 err = PTR_ERR(dp); 1744 goto err_unlock_free; 1745 } 1746 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1747 info->snd_seq, 0, OVS_DP_CMD_NEW); 1748 BUG_ON(err < 0); 1749 ovs_unlock(); 1750 1751 return genlmsg_reply(reply, info); 1752 1753 err_unlock_free: 1754 ovs_unlock(); 1755 kfree_skb(reply); 1756 return err; 1757 } 1758 1759 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1760 { 1761 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1762 struct datapath *dp; 1763 int skip = cb->args[0]; 1764 int i = 0; 1765 1766 ovs_lock(); 1767 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1768 if (i >= skip && 1769 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1770 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1771 OVS_DP_CMD_NEW) < 0) 1772 break; 1773 i++; 1774 } 1775 ovs_unlock(); 1776 1777 cb->args[0] = i; 1778 1779 return skb->len; 1780 } 1781 1782 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1783 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1784 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1785 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1786 }; 1787 1788 static const struct genl_ops dp_datapath_genl_ops[] = { 1789 { .cmd = OVS_DP_CMD_NEW, 1790 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1791 .policy = datapath_policy, 1792 .doit = ovs_dp_cmd_new 1793 }, 1794 { .cmd = OVS_DP_CMD_DEL, 1795 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1796 .policy = datapath_policy, 1797 .doit = ovs_dp_cmd_del 1798 }, 1799 { .cmd = OVS_DP_CMD_GET, 1800 .flags = 0, /* OK for unprivileged users. */ 1801 .policy = datapath_policy, 1802 .doit = ovs_dp_cmd_get, 1803 .dumpit = ovs_dp_cmd_dump 1804 }, 1805 { .cmd = OVS_DP_CMD_SET, 1806 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1807 .policy = datapath_policy, 1808 .doit = ovs_dp_cmd_set, 1809 }, 1810 }; 1811 1812 static struct genl_family dp_datapath_genl_family __ro_after_init = { 1813 .hdrsize = sizeof(struct ovs_header), 1814 .name = OVS_DATAPATH_FAMILY, 1815 .version = OVS_DATAPATH_VERSION, 1816 .maxattr = OVS_DP_ATTR_MAX, 1817 .netnsok = true, 1818 .parallel_ops = true, 1819 .ops = dp_datapath_genl_ops, 1820 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops), 1821 .mcgrps = &ovs_dp_datapath_multicast_group, 1822 .n_mcgrps = 1, 1823 .module = THIS_MODULE, 1824 }; 1825 1826 /* Called with ovs_mutex or RCU read lock. */ 1827 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1828 u32 portid, u32 seq, u32 flags, u8 cmd) 1829 { 1830 struct ovs_header *ovs_header; 1831 struct ovs_vport_stats vport_stats; 1832 int err; 1833 1834 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1835 flags, cmd); 1836 if (!ovs_header) 1837 return -EMSGSIZE; 1838 1839 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1840 1841 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1842 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1843 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 1844 ovs_vport_name(vport))) 1845 goto nla_put_failure; 1846 1847 ovs_vport_get_stats(vport, &vport_stats); 1848 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS, 1849 sizeof(struct ovs_vport_stats), &vport_stats, 1850 OVS_VPORT_ATTR_PAD)) 1851 goto nla_put_failure; 1852 1853 if (ovs_vport_get_upcall_portids(vport, skb)) 1854 goto nla_put_failure; 1855 1856 err = ovs_vport_get_options(vport, skb); 1857 if (err == -EMSGSIZE) 1858 goto error; 1859 1860 genlmsg_end(skb, ovs_header); 1861 return 0; 1862 1863 nla_put_failure: 1864 err = -EMSGSIZE; 1865 error: 1866 genlmsg_cancel(skb, ovs_header); 1867 return err; 1868 } 1869 1870 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 1871 { 1872 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1873 } 1874 1875 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 1876 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid, 1877 u32 seq, u8 cmd) 1878 { 1879 struct sk_buff *skb; 1880 int retval; 1881 1882 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1883 if (!skb) 1884 return ERR_PTR(-ENOMEM); 1885 1886 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd); 1887 BUG_ON(retval < 0); 1888 1889 return skb; 1890 } 1891 1892 /* Called with ovs_mutex or RCU read lock. */ 1893 static struct vport *lookup_vport(struct net *net, 1894 const struct ovs_header *ovs_header, 1895 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1896 { 1897 struct datapath *dp; 1898 struct vport *vport; 1899 1900 if (a[OVS_VPORT_ATTR_NAME]) { 1901 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 1902 if (!vport) 1903 return ERR_PTR(-ENODEV); 1904 if (ovs_header->dp_ifindex && 1905 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 1906 return ERR_PTR(-ENODEV); 1907 return vport; 1908 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 1909 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1910 1911 if (port_no >= DP_MAX_PORTS) 1912 return ERR_PTR(-EFBIG); 1913 1914 dp = get_dp(net, ovs_header->dp_ifindex); 1915 if (!dp) 1916 return ERR_PTR(-ENODEV); 1917 1918 vport = ovs_vport_ovsl_rcu(dp, port_no); 1919 if (!vport) 1920 return ERR_PTR(-ENODEV); 1921 return vport; 1922 } else 1923 return ERR_PTR(-EINVAL); 1924 } 1925 1926 /* Called with ovs_mutex */ 1927 static void update_headroom(struct datapath *dp) 1928 { 1929 unsigned dev_headroom, max_headroom = 0; 1930 struct net_device *dev; 1931 struct vport *vport; 1932 int i; 1933 1934 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1935 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 1936 dev = vport->dev; 1937 dev_headroom = netdev_get_fwd_headroom(dev); 1938 if (dev_headroom > max_headroom) 1939 max_headroom = dev_headroom; 1940 } 1941 } 1942 1943 dp->max_headroom = max_headroom; 1944 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1945 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) 1946 netdev_set_rx_headroom(vport->dev, max_headroom); 1947 } 1948 1949 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 1950 { 1951 struct nlattr **a = info->attrs; 1952 struct ovs_header *ovs_header = info->userhdr; 1953 struct vport_parms parms; 1954 struct sk_buff *reply; 1955 struct vport *vport; 1956 struct datapath *dp; 1957 u32 port_no; 1958 int err; 1959 1960 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 1961 !a[OVS_VPORT_ATTR_UPCALL_PID]) 1962 return -EINVAL; 1963 1964 port_no = a[OVS_VPORT_ATTR_PORT_NO] 1965 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 1966 if (port_no >= DP_MAX_PORTS) 1967 return -EFBIG; 1968 1969 reply = ovs_vport_cmd_alloc_info(); 1970 if (!reply) 1971 return -ENOMEM; 1972 1973 ovs_lock(); 1974 restart: 1975 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1976 err = -ENODEV; 1977 if (!dp) 1978 goto exit_unlock_free; 1979 1980 if (port_no) { 1981 vport = ovs_vport_ovsl(dp, port_no); 1982 err = -EBUSY; 1983 if (vport) 1984 goto exit_unlock_free; 1985 } else { 1986 for (port_no = 1; ; port_no++) { 1987 if (port_no >= DP_MAX_PORTS) { 1988 err = -EFBIG; 1989 goto exit_unlock_free; 1990 } 1991 vport = ovs_vport_ovsl(dp, port_no); 1992 if (!vport) 1993 break; 1994 } 1995 } 1996 1997 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 1998 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 1999 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 2000 parms.dp = dp; 2001 parms.port_no = port_no; 2002 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2003 2004 vport = new_vport(&parms); 2005 err = PTR_ERR(vport); 2006 if (IS_ERR(vport)) { 2007 if (err == -EAGAIN) 2008 goto restart; 2009 goto exit_unlock_free; 2010 } 2011 2012 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 2013 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 2014 2015 if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom) 2016 update_headroom(dp); 2017 else 2018 netdev_set_rx_headroom(vport->dev, dp->max_headroom); 2019 2020 BUG_ON(err < 0); 2021 ovs_unlock(); 2022 2023 ovs_notify(&dp_vport_genl_family, reply, info); 2024 return 0; 2025 2026 exit_unlock_free: 2027 ovs_unlock(); 2028 kfree_skb(reply); 2029 return err; 2030 } 2031 2032 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 2033 { 2034 struct nlattr **a = info->attrs; 2035 struct sk_buff *reply; 2036 struct vport *vport; 2037 int err; 2038 2039 reply = ovs_vport_cmd_alloc_info(); 2040 if (!reply) 2041 return -ENOMEM; 2042 2043 ovs_lock(); 2044 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2045 err = PTR_ERR(vport); 2046 if (IS_ERR(vport)) 2047 goto exit_unlock_free; 2048 2049 if (a[OVS_VPORT_ATTR_TYPE] && 2050 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 2051 err = -EINVAL; 2052 goto exit_unlock_free; 2053 } 2054 2055 if (a[OVS_VPORT_ATTR_OPTIONS]) { 2056 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 2057 if (err) 2058 goto exit_unlock_free; 2059 } 2060 2061 2062 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 2063 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2064 2065 err = ovs_vport_set_upcall_portids(vport, ids); 2066 if (err) 2067 goto exit_unlock_free; 2068 } 2069 2070 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 2071 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 2072 BUG_ON(err < 0); 2073 2074 ovs_unlock(); 2075 ovs_notify(&dp_vport_genl_family, reply, info); 2076 return 0; 2077 2078 exit_unlock_free: 2079 ovs_unlock(); 2080 kfree_skb(reply); 2081 return err; 2082 } 2083 2084 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2085 { 2086 bool must_update_headroom = false; 2087 struct nlattr **a = info->attrs; 2088 struct sk_buff *reply; 2089 struct datapath *dp; 2090 struct vport *vport; 2091 int err; 2092 2093 reply = ovs_vport_cmd_alloc_info(); 2094 if (!reply) 2095 return -ENOMEM; 2096 2097 ovs_lock(); 2098 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2099 err = PTR_ERR(vport); 2100 if (IS_ERR(vport)) 2101 goto exit_unlock_free; 2102 2103 if (vport->port_no == OVSP_LOCAL) { 2104 err = -EINVAL; 2105 goto exit_unlock_free; 2106 } 2107 2108 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 2109 info->snd_seq, 0, OVS_VPORT_CMD_DEL); 2110 BUG_ON(err < 0); 2111 2112 /* the vport deletion may trigger dp headroom update */ 2113 dp = vport->dp; 2114 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom) 2115 must_update_headroom = true; 2116 netdev_reset_rx_headroom(vport->dev); 2117 ovs_dp_detach_port(vport); 2118 2119 if (must_update_headroom) 2120 update_headroom(dp); 2121 ovs_unlock(); 2122 2123 ovs_notify(&dp_vport_genl_family, reply, info); 2124 return 0; 2125 2126 exit_unlock_free: 2127 ovs_unlock(); 2128 kfree_skb(reply); 2129 return err; 2130 } 2131 2132 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2133 { 2134 struct nlattr **a = info->attrs; 2135 struct ovs_header *ovs_header = info->userhdr; 2136 struct sk_buff *reply; 2137 struct vport *vport; 2138 int err; 2139 2140 reply = ovs_vport_cmd_alloc_info(); 2141 if (!reply) 2142 return -ENOMEM; 2143 2144 rcu_read_lock(); 2145 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2146 err = PTR_ERR(vport); 2147 if (IS_ERR(vport)) 2148 goto exit_unlock_free; 2149 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 2150 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 2151 BUG_ON(err < 0); 2152 rcu_read_unlock(); 2153 2154 return genlmsg_reply(reply, info); 2155 2156 exit_unlock_free: 2157 rcu_read_unlock(); 2158 kfree_skb(reply); 2159 return err; 2160 } 2161 2162 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2163 { 2164 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2165 struct datapath *dp; 2166 int bucket = cb->args[0], skip = cb->args[1]; 2167 int i, j = 0; 2168 2169 rcu_read_lock(); 2170 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2171 if (!dp) { 2172 rcu_read_unlock(); 2173 return -ENODEV; 2174 } 2175 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2176 struct vport *vport; 2177 2178 j = 0; 2179 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2180 if (j >= skip && 2181 ovs_vport_cmd_fill_info(vport, skb, 2182 NETLINK_CB(cb->skb).portid, 2183 cb->nlh->nlmsg_seq, 2184 NLM_F_MULTI, 2185 OVS_VPORT_CMD_NEW) < 0) 2186 goto out; 2187 2188 j++; 2189 } 2190 skip = 0; 2191 } 2192 out: 2193 rcu_read_unlock(); 2194 2195 cb->args[0] = i; 2196 cb->args[1] = j; 2197 2198 return skb->len; 2199 } 2200 2201 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2202 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2203 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2204 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2205 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2206 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 2207 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2208 }; 2209 2210 static const struct genl_ops dp_vport_genl_ops[] = { 2211 { .cmd = OVS_VPORT_CMD_NEW, 2212 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2213 .policy = vport_policy, 2214 .doit = ovs_vport_cmd_new 2215 }, 2216 { .cmd = OVS_VPORT_CMD_DEL, 2217 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2218 .policy = vport_policy, 2219 .doit = ovs_vport_cmd_del 2220 }, 2221 { .cmd = OVS_VPORT_CMD_GET, 2222 .flags = 0, /* OK for unprivileged users. */ 2223 .policy = vport_policy, 2224 .doit = ovs_vport_cmd_get, 2225 .dumpit = ovs_vport_cmd_dump 2226 }, 2227 { .cmd = OVS_VPORT_CMD_SET, 2228 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2229 .policy = vport_policy, 2230 .doit = ovs_vport_cmd_set, 2231 }, 2232 }; 2233 2234 struct genl_family dp_vport_genl_family __ro_after_init = { 2235 .hdrsize = sizeof(struct ovs_header), 2236 .name = OVS_VPORT_FAMILY, 2237 .version = OVS_VPORT_VERSION, 2238 .maxattr = OVS_VPORT_ATTR_MAX, 2239 .netnsok = true, 2240 .parallel_ops = true, 2241 .ops = dp_vport_genl_ops, 2242 .n_ops = ARRAY_SIZE(dp_vport_genl_ops), 2243 .mcgrps = &ovs_dp_vport_multicast_group, 2244 .n_mcgrps = 1, 2245 .module = THIS_MODULE, 2246 }; 2247 2248 static struct genl_family * const dp_genl_families[] = { 2249 &dp_datapath_genl_family, 2250 &dp_vport_genl_family, 2251 &dp_flow_genl_family, 2252 &dp_packet_genl_family, 2253 }; 2254 2255 static void dp_unregister_genl(int n_families) 2256 { 2257 int i; 2258 2259 for (i = 0; i < n_families; i++) 2260 genl_unregister_family(dp_genl_families[i]); 2261 } 2262 2263 static int __init dp_register_genl(void) 2264 { 2265 int err; 2266 int i; 2267 2268 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2269 2270 err = genl_register_family(dp_genl_families[i]); 2271 if (err) 2272 goto error; 2273 } 2274 2275 return 0; 2276 2277 error: 2278 dp_unregister_genl(i); 2279 return err; 2280 } 2281 2282 static int __net_init ovs_init_net(struct net *net) 2283 { 2284 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2285 2286 INIT_LIST_HEAD(&ovs_net->dps); 2287 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2288 ovs_ct_init(net); 2289 return 0; 2290 } 2291 2292 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2293 struct list_head *head) 2294 { 2295 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2296 struct datapath *dp; 2297 2298 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2299 int i; 2300 2301 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2302 struct vport *vport; 2303 2304 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2305 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2306 continue; 2307 2308 if (dev_net(vport->dev) == dnet) 2309 list_add(&vport->detach_list, head); 2310 } 2311 } 2312 } 2313 } 2314 2315 static void __net_exit ovs_exit_net(struct net *dnet) 2316 { 2317 struct datapath *dp, *dp_next; 2318 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2319 struct vport *vport, *vport_next; 2320 struct net *net; 2321 LIST_HEAD(head); 2322 2323 ovs_ct_exit(dnet); 2324 ovs_lock(); 2325 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2326 __dp_destroy(dp); 2327 2328 rtnl_lock(); 2329 for_each_net(net) 2330 list_vports_from_net(net, dnet, &head); 2331 rtnl_unlock(); 2332 2333 /* Detach all vports from given namespace. */ 2334 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2335 list_del(&vport->detach_list); 2336 ovs_dp_detach_port(vport); 2337 } 2338 2339 ovs_unlock(); 2340 2341 cancel_work_sync(&ovs_net->dp_notify_work); 2342 } 2343 2344 static struct pernet_operations ovs_net_ops = { 2345 .init = ovs_init_net, 2346 .exit = ovs_exit_net, 2347 .id = &ovs_net_id, 2348 .size = sizeof(struct ovs_net), 2349 }; 2350 2351 static int __init dp_init(void) 2352 { 2353 int err; 2354 2355 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); 2356 2357 pr_info("Open vSwitch switching datapath\n"); 2358 2359 err = action_fifos_init(); 2360 if (err) 2361 goto error; 2362 2363 err = ovs_internal_dev_rtnl_link_register(); 2364 if (err) 2365 goto error_action_fifos_exit; 2366 2367 err = ovs_flow_init(); 2368 if (err) 2369 goto error_unreg_rtnl_link; 2370 2371 err = ovs_vport_init(); 2372 if (err) 2373 goto error_flow_exit; 2374 2375 err = register_pernet_device(&ovs_net_ops); 2376 if (err) 2377 goto error_vport_exit; 2378 2379 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2380 if (err) 2381 goto error_netns_exit; 2382 2383 err = ovs_netdev_init(); 2384 if (err) 2385 goto error_unreg_notifier; 2386 2387 err = dp_register_genl(); 2388 if (err < 0) 2389 goto error_unreg_netdev; 2390 2391 return 0; 2392 2393 error_unreg_netdev: 2394 ovs_netdev_exit(); 2395 error_unreg_notifier: 2396 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2397 error_netns_exit: 2398 unregister_pernet_device(&ovs_net_ops); 2399 error_vport_exit: 2400 ovs_vport_exit(); 2401 error_flow_exit: 2402 ovs_flow_exit(); 2403 error_unreg_rtnl_link: 2404 ovs_internal_dev_rtnl_link_unregister(); 2405 error_action_fifos_exit: 2406 action_fifos_exit(); 2407 error: 2408 return err; 2409 } 2410 2411 static void dp_cleanup(void) 2412 { 2413 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2414 ovs_netdev_exit(); 2415 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2416 unregister_pernet_device(&ovs_net_ops); 2417 rcu_barrier(); 2418 ovs_vport_exit(); 2419 ovs_flow_exit(); 2420 ovs_internal_dev_rtnl_link_unregister(); 2421 action_fifos_exit(); 2422 } 2423 2424 module_init(dp_init); 2425 module_exit(dp_cleanup); 2426 2427 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2428 MODULE_LICENSE("GPL"); 2429 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY); 2430 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY); 2431 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY); 2432 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY); 2433