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 int ovs_net_id __read_mostly; 62 EXPORT_SYMBOL_GPL(ovs_net_id); 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 EXPORT_SYMBOL_GPL(lockdep_ovsl_is_held); 135 #endif 136 137 static struct vport *new_vport(const struct vport_parms *); 138 static int queue_gso_packets(struct datapath *dp, struct sk_buff *, 139 const struct sw_flow_key *, 140 const struct dp_upcall_info *, 141 uint32_t cutlen); 142 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *, 143 const struct sw_flow_key *, 144 const struct dp_upcall_info *, 145 uint32_t cutlen); 146 147 /* Must be called with rcu_read_lock. */ 148 static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex) 149 { 150 struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex); 151 152 if (dev) { 153 struct vport *vport = ovs_internal_dev_get_vport(dev); 154 if (vport) 155 return vport->dp; 156 } 157 158 return NULL; 159 } 160 161 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the 162 * returned dp pointer valid. 163 */ 164 static inline struct datapath *get_dp(struct net *net, int dp_ifindex) 165 { 166 struct datapath *dp; 167 168 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); 169 rcu_read_lock(); 170 dp = get_dp_rcu(net, dp_ifindex); 171 rcu_read_unlock(); 172 173 return dp; 174 } 175 176 /* Must be called with rcu_read_lock or ovs_mutex. */ 177 const char *ovs_dp_name(const struct datapath *dp) 178 { 179 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); 180 return ovs_vport_name(vport); 181 } 182 183 static int get_dpifindex(const struct datapath *dp) 184 { 185 struct vport *local; 186 int ifindex; 187 188 rcu_read_lock(); 189 190 local = ovs_vport_rcu(dp, OVSP_LOCAL); 191 if (local) 192 ifindex = local->dev->ifindex; 193 else 194 ifindex = 0; 195 196 rcu_read_unlock(); 197 198 return ifindex; 199 } 200 201 static void destroy_dp_rcu(struct rcu_head *rcu) 202 { 203 struct datapath *dp = container_of(rcu, struct datapath, rcu); 204 205 ovs_flow_tbl_destroy(&dp->table); 206 free_percpu(dp->stats_percpu); 207 kfree(dp->ports); 208 kfree(dp); 209 } 210 211 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 212 u16 port_no) 213 { 214 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 215 } 216 217 /* Called with ovs_mutex or RCU read lock. */ 218 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 219 { 220 struct vport *vport; 221 struct hlist_head *head; 222 223 head = vport_hash_bucket(dp, port_no); 224 hlist_for_each_entry_rcu(vport, head, dp_hash_node) { 225 if (vport->port_no == port_no) 226 return vport; 227 } 228 return NULL; 229 } 230 231 /* Called with ovs_mutex. */ 232 static struct vport *new_vport(const struct vport_parms *parms) 233 { 234 struct vport *vport; 235 236 vport = ovs_vport_add(parms); 237 if (!IS_ERR(vport)) { 238 struct datapath *dp = parms->dp; 239 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 240 241 hlist_add_head_rcu(&vport->dp_hash_node, head); 242 } 243 return vport; 244 } 245 246 void ovs_dp_detach_port(struct vport *p) 247 { 248 ASSERT_OVSL(); 249 250 /* First drop references to device. */ 251 hlist_del_rcu(&p->dp_hash_node); 252 253 /* Then destroy it. */ 254 ovs_vport_del(p); 255 } 256 257 /* Must be called with rcu_read_lock. */ 258 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key) 259 { 260 const struct vport *p = OVS_CB(skb)->input_vport; 261 struct datapath *dp = p->dp; 262 struct sw_flow *flow; 263 struct sw_flow_actions *sf_acts; 264 struct dp_stats_percpu *stats; 265 u64 *stats_counter; 266 u32 n_mask_hit; 267 268 stats = this_cpu_ptr(dp->stats_percpu); 269 270 /* Look up flow. */ 271 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit); 272 if (unlikely(!flow)) { 273 struct dp_upcall_info upcall; 274 int error; 275 276 memset(&upcall, 0, sizeof(upcall)); 277 upcall.cmd = OVS_PACKET_CMD_MISS; 278 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 279 upcall.mru = OVS_CB(skb)->mru; 280 error = ovs_dp_upcall(dp, skb, key, &upcall, 0); 281 if (unlikely(error)) 282 kfree_skb(skb); 283 else 284 consume_skb(skb); 285 stats_counter = &stats->n_missed; 286 goto out; 287 } 288 289 ovs_flow_stats_update(flow, key->tp.flags, skb); 290 sf_acts = rcu_dereference(flow->sf_acts); 291 ovs_execute_actions(dp, skb, sf_acts, key); 292 293 stats_counter = &stats->n_hit; 294 295 out: 296 /* Update datapath statistics. */ 297 u64_stats_update_begin(&stats->syncp); 298 (*stats_counter)++; 299 stats->n_mask_hit += n_mask_hit; 300 u64_stats_update_end(&stats->syncp); 301 } 302 303 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 304 const struct sw_flow_key *key, 305 const struct dp_upcall_info *upcall_info, 306 uint32_t cutlen) 307 { 308 struct dp_stats_percpu *stats; 309 int err; 310 311 if (upcall_info->portid == 0) { 312 err = -ENOTCONN; 313 goto err; 314 } 315 316 if (!skb_is_gso(skb)) 317 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 318 else 319 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen); 320 if (err) 321 goto err; 322 323 return 0; 324 325 err: 326 stats = this_cpu_ptr(dp->stats_percpu); 327 328 u64_stats_update_begin(&stats->syncp); 329 stats->n_lost++; 330 u64_stats_update_end(&stats->syncp); 331 332 return err; 333 } 334 335 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 336 const struct sw_flow_key *key, 337 const struct dp_upcall_info *upcall_info, 338 uint32_t cutlen) 339 { 340 unsigned short gso_type = skb_shinfo(skb)->gso_type; 341 struct sw_flow_key later_key; 342 struct sk_buff *segs, *nskb; 343 int err; 344 345 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET); 346 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 347 if (IS_ERR(segs)) 348 return PTR_ERR(segs); 349 if (segs == NULL) 350 return -EINVAL; 351 352 if (gso_type & SKB_GSO_UDP) { 353 /* The initial flow key extracted by ovs_flow_key_extract() 354 * in this case is for a first fragment, so we need to 355 * properly mark later fragments. 356 */ 357 later_key = *key; 358 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 359 } 360 361 /* Queue all of the segments. */ 362 skb = segs; 363 do { 364 if (gso_type & SKB_GSO_UDP && skb != segs) 365 key = &later_key; 366 367 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 368 if (err) 369 break; 370 371 } while ((skb = skb->next)); 372 373 /* Free all of the segments. */ 374 skb = segs; 375 do { 376 nskb = skb->next; 377 if (err) 378 kfree_skb(skb); 379 else 380 consume_skb(skb); 381 } while ((skb = nskb)); 382 return err; 383 } 384 385 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, 386 unsigned int hdrlen) 387 { 388 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 389 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 390 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */ 391 + nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */ 392 393 /* OVS_PACKET_ATTR_USERDATA */ 394 if (upcall_info->userdata) 395 size += NLA_ALIGN(upcall_info->userdata->nla_len); 396 397 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ 398 if (upcall_info->egress_tun_info) 399 size += nla_total_size(ovs_tun_key_attr_size()); 400 401 /* OVS_PACKET_ATTR_ACTIONS */ 402 if (upcall_info->actions_len) 403 size += nla_total_size(upcall_info->actions_len); 404 405 /* OVS_PACKET_ATTR_MRU */ 406 if (upcall_info->mru) 407 size += nla_total_size(sizeof(upcall_info->mru)); 408 409 return size; 410 } 411 412 static void pad_packet(struct datapath *dp, struct sk_buff *skb) 413 { 414 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 415 size_t plen = NLA_ALIGN(skb->len) - skb->len; 416 417 if (plen > 0) 418 memset(skb_put(skb, plen), 0, plen); 419 } 420 } 421 422 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 423 const struct sw_flow_key *key, 424 const struct dp_upcall_info *upcall_info, 425 uint32_t cutlen) 426 { 427 struct ovs_header *upcall; 428 struct sk_buff *nskb = NULL; 429 struct sk_buff *user_skb = NULL; /* to be queued to userspace */ 430 struct nlattr *nla; 431 size_t len; 432 unsigned int hlen; 433 int err, dp_ifindex; 434 435 dp_ifindex = get_dpifindex(dp); 436 if (!dp_ifindex) 437 return -ENODEV; 438 439 if (skb_vlan_tag_present(skb)) { 440 nskb = skb_clone(skb, GFP_ATOMIC); 441 if (!nskb) 442 return -ENOMEM; 443 444 nskb = __vlan_hwaccel_push_inside(nskb); 445 if (!nskb) 446 return -ENOMEM; 447 448 skb = nskb; 449 } 450 451 if (nla_attr_size(skb->len) > USHRT_MAX) { 452 err = -EFBIG; 453 goto out; 454 } 455 456 /* Complete checksum if needed */ 457 if (skb->ip_summed == CHECKSUM_PARTIAL && 458 (err = skb_checksum_help(skb))) 459 goto out; 460 461 /* Older versions of OVS user space enforce alignment of the last 462 * Netlink attribute to NLA_ALIGNTO which would require extensive 463 * padding logic. Only perform zerocopy if padding is not required. 464 */ 465 if (dp->user_features & OVS_DP_F_UNALIGNED) 466 hlen = skb_zerocopy_headlen(skb); 467 else 468 hlen = skb->len; 469 470 len = upcall_msg_size(upcall_info, hlen - cutlen); 471 user_skb = genlmsg_new(len, GFP_ATOMIC); 472 if (!user_skb) { 473 err = -ENOMEM; 474 goto out; 475 } 476 477 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 478 0, upcall_info->cmd); 479 upcall->dp_ifindex = dp_ifindex; 480 481 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); 482 BUG_ON(err); 483 484 if (upcall_info->userdata) 485 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 486 nla_len(upcall_info->userdata), 487 nla_data(upcall_info->userdata)); 488 489 if (upcall_info->egress_tun_info) { 490 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY); 491 err = ovs_nla_put_tunnel_info(user_skb, 492 upcall_info->egress_tun_info); 493 BUG_ON(err); 494 nla_nest_end(user_skb, nla); 495 } 496 497 if (upcall_info->actions_len) { 498 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS); 499 err = ovs_nla_put_actions(upcall_info->actions, 500 upcall_info->actions_len, 501 user_skb); 502 if (!err) 503 nla_nest_end(user_skb, nla); 504 else 505 nla_nest_cancel(user_skb, nla); 506 } 507 508 /* Add OVS_PACKET_ATTR_MRU */ 509 if (upcall_info->mru) { 510 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, 511 upcall_info->mru)) { 512 err = -ENOBUFS; 513 goto out; 514 } 515 pad_packet(dp, user_skb); 516 } 517 518 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */ 519 if (cutlen > 0) { 520 if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, 521 skb->len)) { 522 err = -ENOBUFS; 523 goto out; 524 } 525 pad_packet(dp, user_skb); 526 } 527 528 /* Only reserve room for attribute header, packet data is added 529 * in skb_zerocopy() */ 530 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 531 err = -ENOBUFS; 532 goto out; 533 } 534 nla->nla_len = nla_attr_size(skb->len - cutlen); 535 536 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen); 537 if (err) 538 goto out; 539 540 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 541 pad_packet(dp, user_skb); 542 543 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 544 545 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 546 user_skb = NULL; 547 out: 548 if (err) 549 skb_tx_error(skb); 550 kfree_skb(user_skb); 551 kfree_skb(nskb); 552 return err; 553 } 554 555 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 556 { 557 struct ovs_header *ovs_header = info->userhdr; 558 struct net *net = sock_net(skb->sk); 559 struct nlattr **a = info->attrs; 560 struct sw_flow_actions *acts; 561 struct sk_buff *packet; 562 struct sw_flow *flow; 563 struct sw_flow_actions *sf_acts; 564 struct datapath *dp; 565 struct ethhdr *eth; 566 struct vport *input_vport; 567 u16 mru = 0; 568 int len; 569 int err; 570 bool log = !a[OVS_PACKET_ATTR_PROBE]; 571 572 err = -EINVAL; 573 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 574 !a[OVS_PACKET_ATTR_ACTIONS]) 575 goto err; 576 577 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 578 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 579 err = -ENOMEM; 580 if (!packet) 581 goto err; 582 skb_reserve(packet, NET_IP_ALIGN); 583 584 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 585 586 skb_reset_mac_header(packet); 587 eth = eth_hdr(packet); 588 589 /* Normally, setting the skb 'protocol' field would be handled by a 590 * call to eth_type_trans(), but it assumes there's a sending 591 * device, which we may not have. */ 592 if (eth_proto_is_802_3(eth->h_proto)) 593 packet->protocol = eth->h_proto; 594 else 595 packet->protocol = htons(ETH_P_802_2); 596 597 /* Set packet's mru */ 598 if (a[OVS_PACKET_ATTR_MRU]) { 599 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]); 600 packet->ignore_df = 1; 601 } 602 OVS_CB(packet)->mru = mru; 603 604 /* Build an sw_flow for sending this packet. */ 605 flow = ovs_flow_alloc(); 606 err = PTR_ERR(flow); 607 if (IS_ERR(flow)) 608 goto err_kfree_skb; 609 610 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY], 611 packet, &flow->key, log); 612 if (err) 613 goto err_flow_free; 614 615 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS], 616 &flow->key, &acts, log); 617 if (err) 618 goto err_flow_free; 619 620 rcu_assign_pointer(flow->sf_acts, acts); 621 packet->priority = flow->key.phy.priority; 622 packet->mark = flow->key.phy.skb_mark; 623 624 rcu_read_lock(); 625 dp = get_dp_rcu(net, ovs_header->dp_ifindex); 626 err = -ENODEV; 627 if (!dp) 628 goto err_unlock; 629 630 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 631 if (!input_vport) 632 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 633 634 if (!input_vport) 635 goto err_unlock; 636 637 packet->dev = input_vport->dev; 638 OVS_CB(packet)->input_vport = input_vport; 639 sf_acts = rcu_dereference(flow->sf_acts); 640 641 local_bh_disable(); 642 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); 643 local_bh_enable(); 644 rcu_read_unlock(); 645 646 ovs_flow_free(flow, false); 647 return err; 648 649 err_unlock: 650 rcu_read_unlock(); 651 err_flow_free: 652 ovs_flow_free(flow, false); 653 err_kfree_skb: 654 kfree_skb(packet); 655 err: 656 return err; 657 } 658 659 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 660 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 661 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 662 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 663 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, 664 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, 665 }; 666 667 static const struct genl_ops dp_packet_genl_ops[] = { 668 { .cmd = OVS_PACKET_CMD_EXECUTE, 669 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 670 .policy = packet_policy, 671 .doit = ovs_packet_cmd_execute 672 } 673 }; 674 675 static struct genl_family dp_packet_genl_family = { 676 .id = GENL_ID_GENERATE, 677 .hdrsize = sizeof(struct ovs_header), 678 .name = OVS_PACKET_FAMILY, 679 .version = OVS_PACKET_VERSION, 680 .maxattr = OVS_PACKET_ATTR_MAX, 681 .netnsok = true, 682 .parallel_ops = true, 683 .ops = dp_packet_genl_ops, 684 .n_ops = ARRAY_SIZE(dp_packet_genl_ops), 685 }; 686 687 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 688 struct ovs_dp_megaflow_stats *mega_stats) 689 { 690 int i; 691 692 memset(mega_stats, 0, sizeof(*mega_stats)); 693 694 stats->n_flows = ovs_flow_tbl_count(&dp->table); 695 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 696 697 stats->n_hit = stats->n_missed = stats->n_lost = 0; 698 699 for_each_possible_cpu(i) { 700 const struct dp_stats_percpu *percpu_stats; 701 struct dp_stats_percpu local_stats; 702 unsigned int start; 703 704 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 705 706 do { 707 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 708 local_stats = *percpu_stats; 709 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 710 711 stats->n_hit += local_stats.n_hit; 712 stats->n_missed += local_stats.n_missed; 713 stats->n_lost += local_stats.n_lost; 714 mega_stats->n_mask_hit += local_stats.n_mask_hit; 715 } 716 } 717 718 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) 719 { 720 return ovs_identifier_is_ufid(sfid) && 721 !(ufid_flags & OVS_UFID_F_OMIT_KEY); 722 } 723 724 static bool should_fill_mask(uint32_t ufid_flags) 725 { 726 return !(ufid_flags & OVS_UFID_F_OMIT_MASK); 727 } 728 729 static bool should_fill_actions(uint32_t ufid_flags) 730 { 731 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); 732 } 733 734 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, 735 const struct sw_flow_id *sfid, 736 uint32_t ufid_flags) 737 { 738 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); 739 740 /* OVS_FLOW_ATTR_UFID */ 741 if (sfid && ovs_identifier_is_ufid(sfid)) 742 len += nla_total_size(sfid->ufid_len); 743 744 /* OVS_FLOW_ATTR_KEY */ 745 if (!sfid || should_fill_key(sfid, ufid_flags)) 746 len += nla_total_size(ovs_key_attr_size()); 747 748 /* OVS_FLOW_ATTR_MASK */ 749 if (should_fill_mask(ufid_flags)) 750 len += nla_total_size(ovs_key_attr_size()); 751 752 /* OVS_FLOW_ATTR_ACTIONS */ 753 if (should_fill_actions(ufid_flags)) 754 len += nla_total_size(acts->orig_len); 755 756 return len 757 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 758 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 759 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */ 760 } 761 762 /* Called with ovs_mutex or RCU read lock. */ 763 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 764 struct sk_buff *skb) 765 { 766 struct ovs_flow_stats stats; 767 __be16 tcp_flags; 768 unsigned long used; 769 770 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 771 772 if (used && 773 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used), 774 OVS_FLOW_ATTR_PAD)) 775 return -EMSGSIZE; 776 777 if (stats.n_packets && 778 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS, 779 sizeof(struct ovs_flow_stats), &stats, 780 OVS_FLOW_ATTR_PAD)) 781 return -EMSGSIZE; 782 783 if ((u8)ntohs(tcp_flags) && 784 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 785 return -EMSGSIZE; 786 787 return 0; 788 } 789 790 /* Called with ovs_mutex or RCU read lock. */ 791 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 792 struct sk_buff *skb, int skb_orig_len) 793 { 794 struct nlattr *start; 795 int err; 796 797 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 798 * this is the first flow to be dumped into 'skb'. This is unusual for 799 * Netlink but individual action lists can be longer than 800 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 801 * The userspace caller can always fetch the actions separately if it 802 * really wants them. (Most userspace callers in fact don't care.) 803 * 804 * This can only fail for dump operations because the skb is always 805 * properly sized for single flows. 806 */ 807 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS); 808 if (start) { 809 const struct sw_flow_actions *sf_acts; 810 811 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 812 err = ovs_nla_put_actions(sf_acts->actions, 813 sf_acts->actions_len, skb); 814 815 if (!err) 816 nla_nest_end(skb, start); 817 else { 818 if (skb_orig_len) 819 return err; 820 821 nla_nest_cancel(skb, start); 822 } 823 } else if (skb_orig_len) { 824 return -EMSGSIZE; 825 } 826 827 return 0; 828 } 829 830 /* Called with ovs_mutex or RCU read lock. */ 831 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 832 struct sk_buff *skb, u32 portid, 833 u32 seq, u32 flags, u8 cmd, u32 ufid_flags) 834 { 835 const int skb_orig_len = skb->len; 836 struct ovs_header *ovs_header; 837 int err; 838 839 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 840 flags, cmd); 841 if (!ovs_header) 842 return -EMSGSIZE; 843 844 ovs_header->dp_ifindex = dp_ifindex; 845 846 err = ovs_nla_put_identifier(flow, skb); 847 if (err) 848 goto error; 849 850 if (should_fill_key(&flow->id, ufid_flags)) { 851 err = ovs_nla_put_masked_key(flow, skb); 852 if (err) 853 goto error; 854 } 855 856 if (should_fill_mask(ufid_flags)) { 857 err = ovs_nla_put_mask(flow, skb); 858 if (err) 859 goto error; 860 } 861 862 err = ovs_flow_cmd_fill_stats(flow, skb); 863 if (err) 864 goto error; 865 866 if (should_fill_actions(ufid_flags)) { 867 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 868 if (err) 869 goto error; 870 } 871 872 genlmsg_end(skb, ovs_header); 873 return 0; 874 875 error: 876 genlmsg_cancel(skb, ovs_header); 877 return err; 878 } 879 880 /* May not be called with RCU read lock. */ 881 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 882 const struct sw_flow_id *sfid, 883 struct genl_info *info, 884 bool always, 885 uint32_t ufid_flags) 886 { 887 struct sk_buff *skb; 888 size_t len; 889 890 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 891 return NULL; 892 893 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); 894 skb = genlmsg_new(len, GFP_KERNEL); 895 if (!skb) 896 return ERR_PTR(-ENOMEM); 897 898 return skb; 899 } 900 901 /* Called with ovs_mutex. */ 902 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 903 int dp_ifindex, 904 struct genl_info *info, u8 cmd, 905 bool always, u32 ufid_flags) 906 { 907 struct sk_buff *skb; 908 int retval; 909 910 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), 911 &flow->id, info, always, ufid_flags); 912 if (IS_ERR_OR_NULL(skb)) 913 return skb; 914 915 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 916 info->snd_portid, info->snd_seq, 0, 917 cmd, ufid_flags); 918 BUG_ON(retval < 0); 919 return skb; 920 } 921 922 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 923 { 924 struct net *net = sock_net(skb->sk); 925 struct nlattr **a = info->attrs; 926 struct ovs_header *ovs_header = info->userhdr; 927 struct sw_flow *flow = NULL, *new_flow; 928 struct sw_flow_mask mask; 929 struct sk_buff *reply; 930 struct datapath *dp; 931 struct sw_flow_key key; 932 struct sw_flow_actions *acts; 933 struct sw_flow_match match; 934 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 935 int error; 936 bool log = !a[OVS_FLOW_ATTR_PROBE]; 937 938 /* Must have key and actions. */ 939 error = -EINVAL; 940 if (!a[OVS_FLOW_ATTR_KEY]) { 941 OVS_NLERR(log, "Flow key attr not present in new flow."); 942 goto error; 943 } 944 if (!a[OVS_FLOW_ATTR_ACTIONS]) { 945 OVS_NLERR(log, "Flow actions attr not present in new flow."); 946 goto error; 947 } 948 949 /* Most of the time we need to allocate a new flow, do it before 950 * locking. 951 */ 952 new_flow = ovs_flow_alloc(); 953 if (IS_ERR(new_flow)) { 954 error = PTR_ERR(new_flow); 955 goto error; 956 } 957 958 /* Extract key. */ 959 ovs_match_init(&match, &key, &mask); 960 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 961 a[OVS_FLOW_ATTR_MASK], log); 962 if (error) 963 goto err_kfree_flow; 964 965 ovs_flow_mask_key(&new_flow->key, &key, true, &mask); 966 967 /* Extract flow identifier. */ 968 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID], 969 &key, log); 970 if (error) 971 goto err_kfree_flow; 972 973 /* Validate actions. */ 974 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS], 975 &new_flow->key, &acts, log); 976 if (error) { 977 OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); 978 goto err_kfree_flow; 979 } 980 981 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false, 982 ufid_flags); 983 if (IS_ERR(reply)) { 984 error = PTR_ERR(reply); 985 goto err_kfree_acts; 986 } 987 988 ovs_lock(); 989 dp = get_dp(net, ovs_header->dp_ifindex); 990 if (unlikely(!dp)) { 991 error = -ENODEV; 992 goto err_unlock_ovs; 993 } 994 995 /* Check if this is a duplicate flow */ 996 if (ovs_identifier_is_ufid(&new_flow->id)) 997 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id); 998 if (!flow) 999 flow = ovs_flow_tbl_lookup(&dp->table, &key); 1000 if (likely(!flow)) { 1001 rcu_assign_pointer(new_flow->sf_acts, acts); 1002 1003 /* Put flow in bucket. */ 1004 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 1005 if (unlikely(error)) { 1006 acts = NULL; 1007 goto err_unlock_ovs; 1008 } 1009 1010 if (unlikely(reply)) { 1011 error = ovs_flow_cmd_fill_info(new_flow, 1012 ovs_header->dp_ifindex, 1013 reply, info->snd_portid, 1014 info->snd_seq, 0, 1015 OVS_FLOW_CMD_NEW, 1016 ufid_flags); 1017 BUG_ON(error < 0); 1018 } 1019 ovs_unlock(); 1020 } else { 1021 struct sw_flow_actions *old_acts; 1022 1023 /* Bail out if we're not allowed to modify an existing flow. 1024 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 1025 * because Generic Netlink treats the latter as a dump 1026 * request. We also accept NLM_F_EXCL in case that bug ever 1027 * gets fixed. 1028 */ 1029 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 1030 | NLM_F_EXCL))) { 1031 error = -EEXIST; 1032 goto err_unlock_ovs; 1033 } 1034 /* The flow identifier has to be the same for flow updates. 1035 * Look for any overlapping flow. 1036 */ 1037 if (unlikely(!ovs_flow_cmp(flow, &match))) { 1038 if (ovs_identifier_is_key(&flow->id)) 1039 flow = ovs_flow_tbl_lookup_exact(&dp->table, 1040 &match); 1041 else /* UFID matches but key is different */ 1042 flow = NULL; 1043 if (!flow) { 1044 error = -ENOENT; 1045 goto err_unlock_ovs; 1046 } 1047 } 1048 /* Update actions. */ 1049 old_acts = ovsl_dereference(flow->sf_acts); 1050 rcu_assign_pointer(flow->sf_acts, acts); 1051 1052 if (unlikely(reply)) { 1053 error = ovs_flow_cmd_fill_info(flow, 1054 ovs_header->dp_ifindex, 1055 reply, info->snd_portid, 1056 info->snd_seq, 0, 1057 OVS_FLOW_CMD_NEW, 1058 ufid_flags); 1059 BUG_ON(error < 0); 1060 } 1061 ovs_unlock(); 1062 1063 ovs_nla_free_flow_actions_rcu(old_acts); 1064 ovs_flow_free(new_flow, false); 1065 } 1066 1067 if (reply) 1068 ovs_notify(&dp_flow_genl_family, reply, info); 1069 return 0; 1070 1071 err_unlock_ovs: 1072 ovs_unlock(); 1073 kfree_skb(reply); 1074 err_kfree_acts: 1075 ovs_nla_free_flow_actions(acts); 1076 err_kfree_flow: 1077 ovs_flow_free(new_flow, false); 1078 error: 1079 return error; 1080 } 1081 1082 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ 1083 static struct sw_flow_actions *get_flow_actions(struct net *net, 1084 const struct nlattr *a, 1085 const struct sw_flow_key *key, 1086 const struct sw_flow_mask *mask, 1087 bool log) 1088 { 1089 struct sw_flow_actions *acts; 1090 struct sw_flow_key masked_key; 1091 int error; 1092 1093 ovs_flow_mask_key(&masked_key, key, true, mask); 1094 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log); 1095 if (error) { 1096 OVS_NLERR(log, 1097 "Actions may not be safe on all matching packets"); 1098 return ERR_PTR(error); 1099 } 1100 1101 return acts; 1102 } 1103 1104 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 1105 { 1106 struct net *net = sock_net(skb->sk); 1107 struct nlattr **a = info->attrs; 1108 struct ovs_header *ovs_header = info->userhdr; 1109 struct sw_flow_key key; 1110 struct sw_flow *flow; 1111 struct sw_flow_mask mask; 1112 struct sk_buff *reply = NULL; 1113 struct datapath *dp; 1114 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 1115 struct sw_flow_match match; 1116 struct sw_flow_id sfid; 1117 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1118 int error = 0; 1119 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1120 bool ufid_present; 1121 1122 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); 1123 if (a[OVS_FLOW_ATTR_KEY]) { 1124 ovs_match_init(&match, &key, &mask); 1125 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1126 a[OVS_FLOW_ATTR_MASK], log); 1127 } else if (!ufid_present) { 1128 OVS_NLERR(log, 1129 "Flow set message rejected, Key attribute missing."); 1130 error = -EINVAL; 1131 } 1132 if (error) 1133 goto error; 1134 1135 /* Validate actions. */ 1136 if (a[OVS_FLOW_ATTR_ACTIONS]) { 1137 if (!a[OVS_FLOW_ATTR_KEY]) { 1138 OVS_NLERR(log, 1139 "Flow key attribute not present in set flow."); 1140 error = -EINVAL; 1141 goto error; 1142 } 1143 1144 acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key, 1145 &mask, log); 1146 if (IS_ERR(acts)) { 1147 error = PTR_ERR(acts); 1148 goto error; 1149 } 1150 1151 /* Can allocate before locking if have acts. */ 1152 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false, 1153 ufid_flags); 1154 if (IS_ERR(reply)) { 1155 error = PTR_ERR(reply); 1156 goto err_kfree_acts; 1157 } 1158 } 1159 1160 ovs_lock(); 1161 dp = get_dp(net, ovs_header->dp_ifindex); 1162 if (unlikely(!dp)) { 1163 error = -ENODEV; 1164 goto err_unlock_ovs; 1165 } 1166 /* Check that the flow exists. */ 1167 if (ufid_present) 1168 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid); 1169 else 1170 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1171 if (unlikely(!flow)) { 1172 error = -ENOENT; 1173 goto err_unlock_ovs; 1174 } 1175 1176 /* Update actions, if present. */ 1177 if (likely(acts)) { 1178 old_acts = ovsl_dereference(flow->sf_acts); 1179 rcu_assign_pointer(flow->sf_acts, acts); 1180 1181 if (unlikely(reply)) { 1182 error = ovs_flow_cmd_fill_info(flow, 1183 ovs_header->dp_ifindex, 1184 reply, info->snd_portid, 1185 info->snd_seq, 0, 1186 OVS_FLOW_CMD_NEW, 1187 ufid_flags); 1188 BUG_ON(error < 0); 1189 } 1190 } else { 1191 /* Could not alloc without acts before locking. */ 1192 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1193 info, OVS_FLOW_CMD_NEW, false, 1194 ufid_flags); 1195 1196 if (IS_ERR(reply)) { 1197 error = PTR_ERR(reply); 1198 goto err_unlock_ovs; 1199 } 1200 } 1201 1202 /* Clear stats. */ 1203 if (a[OVS_FLOW_ATTR_CLEAR]) 1204 ovs_flow_stats_clear(flow); 1205 ovs_unlock(); 1206 1207 if (reply) 1208 ovs_notify(&dp_flow_genl_family, reply, info); 1209 if (old_acts) 1210 ovs_nla_free_flow_actions_rcu(old_acts); 1211 1212 return 0; 1213 1214 err_unlock_ovs: 1215 ovs_unlock(); 1216 kfree_skb(reply); 1217 err_kfree_acts: 1218 ovs_nla_free_flow_actions(acts); 1219 error: 1220 return error; 1221 } 1222 1223 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1224 { 1225 struct nlattr **a = info->attrs; 1226 struct ovs_header *ovs_header = info->userhdr; 1227 struct net *net = sock_net(skb->sk); 1228 struct sw_flow_key key; 1229 struct sk_buff *reply; 1230 struct sw_flow *flow; 1231 struct datapath *dp; 1232 struct sw_flow_match match; 1233 struct sw_flow_id ufid; 1234 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1235 int err = 0; 1236 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1237 bool ufid_present; 1238 1239 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1240 if (a[OVS_FLOW_ATTR_KEY]) { 1241 ovs_match_init(&match, &key, NULL); 1242 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL, 1243 log); 1244 } else if (!ufid_present) { 1245 OVS_NLERR(log, 1246 "Flow get message rejected, Key attribute missing."); 1247 err = -EINVAL; 1248 } 1249 if (err) 1250 return err; 1251 1252 ovs_lock(); 1253 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1254 if (!dp) { 1255 err = -ENODEV; 1256 goto unlock; 1257 } 1258 1259 if (ufid_present) 1260 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1261 else 1262 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1263 if (!flow) { 1264 err = -ENOENT; 1265 goto unlock; 1266 } 1267 1268 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1269 OVS_FLOW_CMD_NEW, true, ufid_flags); 1270 if (IS_ERR(reply)) { 1271 err = PTR_ERR(reply); 1272 goto unlock; 1273 } 1274 1275 ovs_unlock(); 1276 return genlmsg_reply(reply, info); 1277 unlock: 1278 ovs_unlock(); 1279 return err; 1280 } 1281 1282 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1283 { 1284 struct nlattr **a = info->attrs; 1285 struct ovs_header *ovs_header = info->userhdr; 1286 struct net *net = sock_net(skb->sk); 1287 struct sw_flow_key key; 1288 struct sk_buff *reply; 1289 struct sw_flow *flow = NULL; 1290 struct datapath *dp; 1291 struct sw_flow_match match; 1292 struct sw_flow_id ufid; 1293 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1294 int err; 1295 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1296 bool ufid_present; 1297 1298 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1299 if (a[OVS_FLOW_ATTR_KEY]) { 1300 ovs_match_init(&match, &key, NULL); 1301 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1302 NULL, log); 1303 if (unlikely(err)) 1304 return err; 1305 } 1306 1307 ovs_lock(); 1308 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1309 if (unlikely(!dp)) { 1310 err = -ENODEV; 1311 goto unlock; 1312 } 1313 1314 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) { 1315 err = ovs_flow_tbl_flush(&dp->table); 1316 goto unlock; 1317 } 1318 1319 if (ufid_present) 1320 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1321 else 1322 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1323 if (unlikely(!flow)) { 1324 err = -ENOENT; 1325 goto unlock; 1326 } 1327 1328 ovs_flow_tbl_remove(&dp->table, flow); 1329 ovs_unlock(); 1330 1331 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1332 &flow->id, info, false, ufid_flags); 1333 if (likely(reply)) { 1334 if (likely(!IS_ERR(reply))) { 1335 rcu_read_lock(); /*To keep RCU checker happy. */ 1336 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1337 reply, info->snd_portid, 1338 info->snd_seq, 0, 1339 OVS_FLOW_CMD_DEL, 1340 ufid_flags); 1341 rcu_read_unlock(); 1342 BUG_ON(err < 0); 1343 1344 ovs_notify(&dp_flow_genl_family, reply, info); 1345 } else { 1346 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply)); 1347 } 1348 } 1349 1350 ovs_flow_free(flow, true); 1351 return 0; 1352 unlock: 1353 ovs_unlock(); 1354 return err; 1355 } 1356 1357 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1358 { 1359 struct nlattr *a[__OVS_FLOW_ATTR_MAX]; 1360 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1361 struct table_instance *ti; 1362 struct datapath *dp; 1363 u32 ufid_flags; 1364 int err; 1365 1366 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a, 1367 OVS_FLOW_ATTR_MAX, flow_policy); 1368 if (err) 1369 return err; 1370 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1371 1372 rcu_read_lock(); 1373 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1374 if (!dp) { 1375 rcu_read_unlock(); 1376 return -ENODEV; 1377 } 1378 1379 ti = rcu_dereference(dp->table.ti); 1380 for (;;) { 1381 struct sw_flow *flow; 1382 u32 bucket, obj; 1383 1384 bucket = cb->args[0]; 1385 obj = cb->args[1]; 1386 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1387 if (!flow) 1388 break; 1389 1390 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1391 NETLINK_CB(cb->skb).portid, 1392 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1393 OVS_FLOW_CMD_NEW, ufid_flags) < 0) 1394 break; 1395 1396 cb->args[0] = bucket; 1397 cb->args[1] = obj; 1398 } 1399 rcu_read_unlock(); 1400 return skb->len; 1401 } 1402 1403 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1404 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1405 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1406 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1407 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1408 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1409 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, 1410 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, 1411 }; 1412 1413 static const struct genl_ops dp_flow_genl_ops[] = { 1414 { .cmd = OVS_FLOW_CMD_NEW, 1415 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1416 .policy = flow_policy, 1417 .doit = ovs_flow_cmd_new 1418 }, 1419 { .cmd = OVS_FLOW_CMD_DEL, 1420 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1421 .policy = flow_policy, 1422 .doit = ovs_flow_cmd_del 1423 }, 1424 { .cmd = OVS_FLOW_CMD_GET, 1425 .flags = 0, /* OK for unprivileged users. */ 1426 .policy = flow_policy, 1427 .doit = ovs_flow_cmd_get, 1428 .dumpit = ovs_flow_cmd_dump 1429 }, 1430 { .cmd = OVS_FLOW_CMD_SET, 1431 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1432 .policy = flow_policy, 1433 .doit = ovs_flow_cmd_set, 1434 }, 1435 }; 1436 1437 static struct genl_family dp_flow_genl_family = { 1438 .id = GENL_ID_GENERATE, 1439 .hdrsize = sizeof(struct ovs_header), 1440 .name = OVS_FLOW_FAMILY, 1441 .version = OVS_FLOW_VERSION, 1442 .maxattr = OVS_FLOW_ATTR_MAX, 1443 .netnsok = true, 1444 .parallel_ops = true, 1445 .ops = dp_flow_genl_ops, 1446 .n_ops = ARRAY_SIZE(dp_flow_genl_ops), 1447 .mcgrps = &ovs_dp_flow_multicast_group, 1448 .n_mcgrps = 1, 1449 }; 1450 1451 static size_t ovs_dp_cmd_msg_size(void) 1452 { 1453 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1454 1455 msgsize += nla_total_size(IFNAMSIZ); 1456 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats)); 1457 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats)); 1458 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1459 1460 return msgsize; 1461 } 1462 1463 /* Called with ovs_mutex. */ 1464 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1465 u32 portid, u32 seq, u32 flags, u8 cmd) 1466 { 1467 struct ovs_header *ovs_header; 1468 struct ovs_dp_stats dp_stats; 1469 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1470 int err; 1471 1472 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1473 flags, cmd); 1474 if (!ovs_header) 1475 goto error; 1476 1477 ovs_header->dp_ifindex = get_dpifindex(dp); 1478 1479 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1480 if (err) 1481 goto nla_put_failure; 1482 1483 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1484 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1485 &dp_stats, OVS_DP_ATTR_PAD)) 1486 goto nla_put_failure; 1487 1488 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1489 sizeof(struct ovs_dp_megaflow_stats), 1490 &dp_megaflow_stats, OVS_DP_ATTR_PAD)) 1491 goto nla_put_failure; 1492 1493 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1494 goto nla_put_failure; 1495 1496 genlmsg_end(skb, ovs_header); 1497 return 0; 1498 1499 nla_put_failure: 1500 genlmsg_cancel(skb, ovs_header); 1501 error: 1502 return -EMSGSIZE; 1503 } 1504 1505 static struct sk_buff *ovs_dp_cmd_alloc_info(void) 1506 { 1507 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL); 1508 } 1509 1510 /* Called with rcu_read_lock or ovs_mutex. */ 1511 static struct datapath *lookup_datapath(struct net *net, 1512 const struct ovs_header *ovs_header, 1513 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1514 { 1515 struct datapath *dp; 1516 1517 if (!a[OVS_DP_ATTR_NAME]) 1518 dp = get_dp(net, ovs_header->dp_ifindex); 1519 else { 1520 struct vport *vport; 1521 1522 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1523 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1524 } 1525 return dp ? dp : ERR_PTR(-ENODEV); 1526 } 1527 1528 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info) 1529 { 1530 struct datapath *dp; 1531 1532 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1533 if (IS_ERR(dp)) 1534 return; 1535 1536 WARN(dp->user_features, "Dropping previously announced user features\n"); 1537 dp->user_features = 0; 1538 } 1539 1540 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1541 { 1542 if (a[OVS_DP_ATTR_USER_FEATURES]) 1543 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1544 } 1545 1546 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1547 { 1548 struct nlattr **a = info->attrs; 1549 struct vport_parms parms; 1550 struct sk_buff *reply; 1551 struct datapath *dp; 1552 struct vport *vport; 1553 struct ovs_net *ovs_net; 1554 int err, i; 1555 1556 err = -EINVAL; 1557 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1558 goto err; 1559 1560 reply = ovs_dp_cmd_alloc_info(); 1561 if (!reply) 1562 return -ENOMEM; 1563 1564 err = -ENOMEM; 1565 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1566 if (dp == NULL) 1567 goto err_free_reply; 1568 1569 ovs_dp_set_net(dp, sock_net(skb->sk)); 1570 1571 /* Allocate table. */ 1572 err = ovs_flow_tbl_init(&dp->table); 1573 if (err) 1574 goto err_free_dp; 1575 1576 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1577 if (!dp->stats_percpu) { 1578 err = -ENOMEM; 1579 goto err_destroy_table; 1580 } 1581 1582 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head), 1583 GFP_KERNEL); 1584 if (!dp->ports) { 1585 err = -ENOMEM; 1586 goto err_destroy_percpu; 1587 } 1588 1589 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1590 INIT_HLIST_HEAD(&dp->ports[i]); 1591 1592 /* Set up our datapath device. */ 1593 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1594 parms.type = OVS_VPORT_TYPE_INTERNAL; 1595 parms.options = NULL; 1596 parms.dp = dp; 1597 parms.port_no = OVSP_LOCAL; 1598 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1599 1600 ovs_dp_change(dp, a); 1601 1602 /* So far only local changes have been made, now need the lock. */ 1603 ovs_lock(); 1604 1605 vport = new_vport(&parms); 1606 if (IS_ERR(vport)) { 1607 err = PTR_ERR(vport); 1608 if (err == -EBUSY) 1609 err = -EEXIST; 1610 1611 if (err == -EEXIST) { 1612 /* An outdated user space instance that does not understand 1613 * the concept of user_features has attempted to create a new 1614 * datapath and is likely to reuse it. Drop all user features. 1615 */ 1616 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1617 ovs_dp_reset_user_features(skb, info); 1618 } 1619 1620 goto err_destroy_ports_array; 1621 } 1622 1623 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1624 info->snd_seq, 0, OVS_DP_CMD_NEW); 1625 BUG_ON(err < 0); 1626 1627 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1628 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1629 1630 ovs_unlock(); 1631 1632 ovs_notify(&dp_datapath_genl_family, reply, info); 1633 return 0; 1634 1635 err_destroy_ports_array: 1636 ovs_unlock(); 1637 kfree(dp->ports); 1638 err_destroy_percpu: 1639 free_percpu(dp->stats_percpu); 1640 err_destroy_table: 1641 ovs_flow_tbl_destroy(&dp->table); 1642 err_free_dp: 1643 kfree(dp); 1644 err_free_reply: 1645 kfree_skb(reply); 1646 err: 1647 return err; 1648 } 1649 1650 /* Called with ovs_mutex. */ 1651 static void __dp_destroy(struct datapath *dp) 1652 { 1653 int i; 1654 1655 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1656 struct vport *vport; 1657 struct hlist_node *n; 1658 1659 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1660 if (vport->port_no != OVSP_LOCAL) 1661 ovs_dp_detach_port(vport); 1662 } 1663 1664 list_del_rcu(&dp->list_node); 1665 1666 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1667 * all ports in datapath are destroyed first before freeing datapath. 1668 */ 1669 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1670 1671 /* RCU destroy the flow table */ 1672 call_rcu(&dp->rcu, destroy_dp_rcu); 1673 } 1674 1675 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1676 { 1677 struct sk_buff *reply; 1678 struct datapath *dp; 1679 int err; 1680 1681 reply = ovs_dp_cmd_alloc_info(); 1682 if (!reply) 1683 return -ENOMEM; 1684 1685 ovs_lock(); 1686 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1687 err = PTR_ERR(dp); 1688 if (IS_ERR(dp)) 1689 goto err_unlock_free; 1690 1691 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1692 info->snd_seq, 0, OVS_DP_CMD_DEL); 1693 BUG_ON(err < 0); 1694 1695 __dp_destroy(dp); 1696 ovs_unlock(); 1697 1698 ovs_notify(&dp_datapath_genl_family, reply, info); 1699 1700 return 0; 1701 1702 err_unlock_free: 1703 ovs_unlock(); 1704 kfree_skb(reply); 1705 return err; 1706 } 1707 1708 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1709 { 1710 struct sk_buff *reply; 1711 struct datapath *dp; 1712 int err; 1713 1714 reply = ovs_dp_cmd_alloc_info(); 1715 if (!reply) 1716 return -ENOMEM; 1717 1718 ovs_lock(); 1719 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1720 err = PTR_ERR(dp); 1721 if (IS_ERR(dp)) 1722 goto err_unlock_free; 1723 1724 ovs_dp_change(dp, info->attrs); 1725 1726 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1727 info->snd_seq, 0, OVS_DP_CMD_NEW); 1728 BUG_ON(err < 0); 1729 1730 ovs_unlock(); 1731 ovs_notify(&dp_datapath_genl_family, reply, info); 1732 1733 return 0; 1734 1735 err_unlock_free: 1736 ovs_unlock(); 1737 kfree_skb(reply); 1738 return err; 1739 } 1740 1741 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1742 { 1743 struct sk_buff *reply; 1744 struct datapath *dp; 1745 int err; 1746 1747 reply = ovs_dp_cmd_alloc_info(); 1748 if (!reply) 1749 return -ENOMEM; 1750 1751 ovs_lock(); 1752 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1753 if (IS_ERR(dp)) { 1754 err = PTR_ERR(dp); 1755 goto err_unlock_free; 1756 } 1757 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1758 info->snd_seq, 0, OVS_DP_CMD_NEW); 1759 BUG_ON(err < 0); 1760 ovs_unlock(); 1761 1762 return genlmsg_reply(reply, info); 1763 1764 err_unlock_free: 1765 ovs_unlock(); 1766 kfree_skb(reply); 1767 return err; 1768 } 1769 1770 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1771 { 1772 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1773 struct datapath *dp; 1774 int skip = cb->args[0]; 1775 int i = 0; 1776 1777 ovs_lock(); 1778 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1779 if (i >= skip && 1780 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1781 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1782 OVS_DP_CMD_NEW) < 0) 1783 break; 1784 i++; 1785 } 1786 ovs_unlock(); 1787 1788 cb->args[0] = i; 1789 1790 return skb->len; 1791 } 1792 1793 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1794 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1795 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1796 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1797 }; 1798 1799 static const struct genl_ops dp_datapath_genl_ops[] = { 1800 { .cmd = OVS_DP_CMD_NEW, 1801 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1802 .policy = datapath_policy, 1803 .doit = ovs_dp_cmd_new 1804 }, 1805 { .cmd = OVS_DP_CMD_DEL, 1806 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1807 .policy = datapath_policy, 1808 .doit = ovs_dp_cmd_del 1809 }, 1810 { .cmd = OVS_DP_CMD_GET, 1811 .flags = 0, /* OK for unprivileged users. */ 1812 .policy = datapath_policy, 1813 .doit = ovs_dp_cmd_get, 1814 .dumpit = ovs_dp_cmd_dump 1815 }, 1816 { .cmd = OVS_DP_CMD_SET, 1817 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1818 .policy = datapath_policy, 1819 .doit = ovs_dp_cmd_set, 1820 }, 1821 }; 1822 1823 static struct genl_family dp_datapath_genl_family = { 1824 .id = GENL_ID_GENERATE, 1825 .hdrsize = sizeof(struct ovs_header), 1826 .name = OVS_DATAPATH_FAMILY, 1827 .version = OVS_DATAPATH_VERSION, 1828 .maxattr = OVS_DP_ATTR_MAX, 1829 .netnsok = true, 1830 .parallel_ops = true, 1831 .ops = dp_datapath_genl_ops, 1832 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops), 1833 .mcgrps = &ovs_dp_datapath_multicast_group, 1834 .n_mcgrps = 1, 1835 }; 1836 1837 /* Called with ovs_mutex or RCU read lock. */ 1838 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 1839 u32 portid, u32 seq, u32 flags, u8 cmd) 1840 { 1841 struct ovs_header *ovs_header; 1842 struct ovs_vport_stats vport_stats; 1843 int err; 1844 1845 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 1846 flags, cmd); 1847 if (!ovs_header) 1848 return -EMSGSIZE; 1849 1850 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 1851 1852 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 1853 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 1854 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 1855 ovs_vport_name(vport))) 1856 goto nla_put_failure; 1857 1858 ovs_vport_get_stats(vport, &vport_stats); 1859 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS, 1860 sizeof(struct ovs_vport_stats), &vport_stats, 1861 OVS_VPORT_ATTR_PAD)) 1862 goto nla_put_failure; 1863 1864 if (ovs_vport_get_upcall_portids(vport, skb)) 1865 goto nla_put_failure; 1866 1867 err = ovs_vport_get_options(vport, skb); 1868 if (err == -EMSGSIZE) 1869 goto error; 1870 1871 genlmsg_end(skb, ovs_header); 1872 return 0; 1873 1874 nla_put_failure: 1875 err = -EMSGSIZE; 1876 error: 1877 genlmsg_cancel(skb, ovs_header); 1878 return err; 1879 } 1880 1881 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 1882 { 1883 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1884 } 1885 1886 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 1887 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid, 1888 u32 seq, u8 cmd) 1889 { 1890 struct sk_buff *skb; 1891 int retval; 1892 1893 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1894 if (!skb) 1895 return ERR_PTR(-ENOMEM); 1896 1897 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd); 1898 BUG_ON(retval < 0); 1899 1900 return skb; 1901 } 1902 1903 /* Called with ovs_mutex or RCU read lock. */ 1904 static struct vport *lookup_vport(struct net *net, 1905 const struct ovs_header *ovs_header, 1906 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 1907 { 1908 struct datapath *dp; 1909 struct vport *vport; 1910 1911 if (a[OVS_VPORT_ATTR_NAME]) { 1912 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 1913 if (!vport) 1914 return ERR_PTR(-ENODEV); 1915 if (ovs_header->dp_ifindex && 1916 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 1917 return ERR_PTR(-ENODEV); 1918 return vport; 1919 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 1920 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 1921 1922 if (port_no >= DP_MAX_PORTS) 1923 return ERR_PTR(-EFBIG); 1924 1925 dp = get_dp(net, ovs_header->dp_ifindex); 1926 if (!dp) 1927 return ERR_PTR(-ENODEV); 1928 1929 vport = ovs_vport_ovsl_rcu(dp, port_no); 1930 if (!vport) 1931 return ERR_PTR(-ENODEV); 1932 return vport; 1933 } else 1934 return ERR_PTR(-EINVAL); 1935 } 1936 1937 /* Called with ovs_mutex */ 1938 static void update_headroom(struct datapath *dp) 1939 { 1940 unsigned dev_headroom, max_headroom = 0; 1941 struct net_device *dev; 1942 struct vport *vport; 1943 int i; 1944 1945 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1946 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 1947 dev = vport->dev; 1948 dev_headroom = netdev_get_fwd_headroom(dev); 1949 if (dev_headroom > max_headroom) 1950 max_headroom = dev_headroom; 1951 } 1952 } 1953 1954 dp->max_headroom = max_headroom; 1955 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1956 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) 1957 netdev_set_rx_headroom(vport->dev, max_headroom); 1958 } 1959 1960 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 1961 { 1962 struct nlattr **a = info->attrs; 1963 struct ovs_header *ovs_header = info->userhdr; 1964 struct vport_parms parms; 1965 struct sk_buff *reply; 1966 struct vport *vport; 1967 struct datapath *dp; 1968 u32 port_no; 1969 int err; 1970 1971 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 1972 !a[OVS_VPORT_ATTR_UPCALL_PID]) 1973 return -EINVAL; 1974 1975 port_no = a[OVS_VPORT_ATTR_PORT_NO] 1976 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 1977 if (port_no >= DP_MAX_PORTS) 1978 return -EFBIG; 1979 1980 reply = ovs_vport_cmd_alloc_info(); 1981 if (!reply) 1982 return -ENOMEM; 1983 1984 ovs_lock(); 1985 restart: 1986 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1987 err = -ENODEV; 1988 if (!dp) 1989 goto exit_unlock_free; 1990 1991 if (port_no) { 1992 vport = ovs_vport_ovsl(dp, port_no); 1993 err = -EBUSY; 1994 if (vport) 1995 goto exit_unlock_free; 1996 } else { 1997 for (port_no = 1; ; port_no++) { 1998 if (port_no >= DP_MAX_PORTS) { 1999 err = -EFBIG; 2000 goto exit_unlock_free; 2001 } 2002 vport = ovs_vport_ovsl(dp, port_no); 2003 if (!vport) 2004 break; 2005 } 2006 } 2007 2008 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 2009 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 2010 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 2011 parms.dp = dp; 2012 parms.port_no = port_no; 2013 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2014 2015 vport = new_vport(&parms); 2016 err = PTR_ERR(vport); 2017 if (IS_ERR(vport)) { 2018 if (err == -EAGAIN) 2019 goto restart; 2020 goto exit_unlock_free; 2021 } 2022 2023 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 2024 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 2025 2026 if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom) 2027 update_headroom(dp); 2028 else 2029 netdev_set_rx_headroom(vport->dev, dp->max_headroom); 2030 2031 BUG_ON(err < 0); 2032 ovs_unlock(); 2033 2034 ovs_notify(&dp_vport_genl_family, reply, info); 2035 return 0; 2036 2037 exit_unlock_free: 2038 ovs_unlock(); 2039 kfree_skb(reply); 2040 return err; 2041 } 2042 2043 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 2044 { 2045 struct nlattr **a = info->attrs; 2046 struct sk_buff *reply; 2047 struct vport *vport; 2048 int err; 2049 2050 reply = ovs_vport_cmd_alloc_info(); 2051 if (!reply) 2052 return -ENOMEM; 2053 2054 ovs_lock(); 2055 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2056 err = PTR_ERR(vport); 2057 if (IS_ERR(vport)) 2058 goto exit_unlock_free; 2059 2060 if (a[OVS_VPORT_ATTR_TYPE] && 2061 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 2062 err = -EINVAL; 2063 goto exit_unlock_free; 2064 } 2065 2066 if (a[OVS_VPORT_ATTR_OPTIONS]) { 2067 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 2068 if (err) 2069 goto exit_unlock_free; 2070 } 2071 2072 2073 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 2074 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2075 2076 err = ovs_vport_set_upcall_portids(vport, ids); 2077 if (err) 2078 goto exit_unlock_free; 2079 } 2080 2081 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 2082 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 2083 BUG_ON(err < 0); 2084 2085 ovs_unlock(); 2086 ovs_notify(&dp_vport_genl_family, reply, info); 2087 return 0; 2088 2089 exit_unlock_free: 2090 ovs_unlock(); 2091 kfree_skb(reply); 2092 return err; 2093 } 2094 2095 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2096 { 2097 bool must_update_headroom = false; 2098 struct nlattr **a = info->attrs; 2099 struct sk_buff *reply; 2100 struct datapath *dp; 2101 struct vport *vport; 2102 int err; 2103 2104 reply = ovs_vport_cmd_alloc_info(); 2105 if (!reply) 2106 return -ENOMEM; 2107 2108 ovs_lock(); 2109 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2110 err = PTR_ERR(vport); 2111 if (IS_ERR(vport)) 2112 goto exit_unlock_free; 2113 2114 if (vport->port_no == OVSP_LOCAL) { 2115 err = -EINVAL; 2116 goto exit_unlock_free; 2117 } 2118 2119 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 2120 info->snd_seq, 0, OVS_VPORT_CMD_DEL); 2121 BUG_ON(err < 0); 2122 2123 /* the vport deletion may trigger dp headroom update */ 2124 dp = vport->dp; 2125 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom) 2126 must_update_headroom = true; 2127 netdev_reset_rx_headroom(vport->dev); 2128 ovs_dp_detach_port(vport); 2129 2130 if (must_update_headroom) 2131 update_headroom(dp); 2132 ovs_unlock(); 2133 2134 ovs_notify(&dp_vport_genl_family, reply, info); 2135 return 0; 2136 2137 exit_unlock_free: 2138 ovs_unlock(); 2139 kfree_skb(reply); 2140 return err; 2141 } 2142 2143 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2144 { 2145 struct nlattr **a = info->attrs; 2146 struct ovs_header *ovs_header = info->userhdr; 2147 struct sk_buff *reply; 2148 struct vport *vport; 2149 int err; 2150 2151 reply = ovs_vport_cmd_alloc_info(); 2152 if (!reply) 2153 return -ENOMEM; 2154 2155 rcu_read_lock(); 2156 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2157 err = PTR_ERR(vport); 2158 if (IS_ERR(vport)) 2159 goto exit_unlock_free; 2160 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, 2161 info->snd_seq, 0, OVS_VPORT_CMD_NEW); 2162 BUG_ON(err < 0); 2163 rcu_read_unlock(); 2164 2165 return genlmsg_reply(reply, info); 2166 2167 exit_unlock_free: 2168 rcu_read_unlock(); 2169 kfree_skb(reply); 2170 return err; 2171 } 2172 2173 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2174 { 2175 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2176 struct datapath *dp; 2177 int bucket = cb->args[0], skip = cb->args[1]; 2178 int i, j = 0; 2179 2180 rcu_read_lock(); 2181 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2182 if (!dp) { 2183 rcu_read_unlock(); 2184 return -ENODEV; 2185 } 2186 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2187 struct vport *vport; 2188 2189 j = 0; 2190 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2191 if (j >= skip && 2192 ovs_vport_cmd_fill_info(vport, skb, 2193 NETLINK_CB(cb->skb).portid, 2194 cb->nlh->nlmsg_seq, 2195 NLM_F_MULTI, 2196 OVS_VPORT_CMD_NEW) < 0) 2197 goto out; 2198 2199 j++; 2200 } 2201 skip = 0; 2202 } 2203 out: 2204 rcu_read_unlock(); 2205 2206 cb->args[0] = i; 2207 cb->args[1] = j; 2208 2209 return skb->len; 2210 } 2211 2212 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2213 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2214 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2215 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2216 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2217 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 2218 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2219 }; 2220 2221 static const struct genl_ops dp_vport_genl_ops[] = { 2222 { .cmd = OVS_VPORT_CMD_NEW, 2223 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2224 .policy = vport_policy, 2225 .doit = ovs_vport_cmd_new 2226 }, 2227 { .cmd = OVS_VPORT_CMD_DEL, 2228 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2229 .policy = vport_policy, 2230 .doit = ovs_vport_cmd_del 2231 }, 2232 { .cmd = OVS_VPORT_CMD_GET, 2233 .flags = 0, /* OK for unprivileged users. */ 2234 .policy = vport_policy, 2235 .doit = ovs_vport_cmd_get, 2236 .dumpit = ovs_vport_cmd_dump 2237 }, 2238 { .cmd = OVS_VPORT_CMD_SET, 2239 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2240 .policy = vport_policy, 2241 .doit = ovs_vport_cmd_set, 2242 }, 2243 }; 2244 2245 struct genl_family dp_vport_genl_family = { 2246 .id = GENL_ID_GENERATE, 2247 .hdrsize = sizeof(struct ovs_header), 2248 .name = OVS_VPORT_FAMILY, 2249 .version = OVS_VPORT_VERSION, 2250 .maxattr = OVS_VPORT_ATTR_MAX, 2251 .netnsok = true, 2252 .parallel_ops = true, 2253 .ops = dp_vport_genl_ops, 2254 .n_ops = ARRAY_SIZE(dp_vport_genl_ops), 2255 .mcgrps = &ovs_dp_vport_multicast_group, 2256 .n_mcgrps = 1, 2257 }; 2258 2259 static struct genl_family * const dp_genl_families[] = { 2260 &dp_datapath_genl_family, 2261 &dp_vport_genl_family, 2262 &dp_flow_genl_family, 2263 &dp_packet_genl_family, 2264 }; 2265 2266 static void dp_unregister_genl(int n_families) 2267 { 2268 int i; 2269 2270 for (i = 0; i < n_families; i++) 2271 genl_unregister_family(dp_genl_families[i]); 2272 } 2273 2274 static int dp_register_genl(void) 2275 { 2276 int err; 2277 int i; 2278 2279 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2280 2281 err = genl_register_family(dp_genl_families[i]); 2282 if (err) 2283 goto error; 2284 } 2285 2286 return 0; 2287 2288 error: 2289 dp_unregister_genl(i); 2290 return err; 2291 } 2292 2293 static int __net_init ovs_init_net(struct net *net) 2294 { 2295 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2296 2297 INIT_LIST_HEAD(&ovs_net->dps); 2298 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2299 ovs_ct_init(net); 2300 return 0; 2301 } 2302 2303 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2304 struct list_head *head) 2305 { 2306 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2307 struct datapath *dp; 2308 2309 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2310 int i; 2311 2312 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2313 struct vport *vport; 2314 2315 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2316 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2317 continue; 2318 2319 if (dev_net(vport->dev) == dnet) 2320 list_add(&vport->detach_list, head); 2321 } 2322 } 2323 } 2324 } 2325 2326 static void __net_exit ovs_exit_net(struct net *dnet) 2327 { 2328 struct datapath *dp, *dp_next; 2329 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2330 struct vport *vport, *vport_next; 2331 struct net *net; 2332 LIST_HEAD(head); 2333 2334 ovs_ct_exit(dnet); 2335 ovs_lock(); 2336 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2337 __dp_destroy(dp); 2338 2339 rtnl_lock(); 2340 for_each_net(net) 2341 list_vports_from_net(net, dnet, &head); 2342 rtnl_unlock(); 2343 2344 /* Detach all vports from given namespace. */ 2345 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2346 list_del(&vport->detach_list); 2347 ovs_dp_detach_port(vport); 2348 } 2349 2350 ovs_unlock(); 2351 2352 cancel_work_sync(&ovs_net->dp_notify_work); 2353 } 2354 2355 static struct pernet_operations ovs_net_ops = { 2356 .init = ovs_init_net, 2357 .exit = ovs_exit_net, 2358 .id = &ovs_net_id, 2359 .size = sizeof(struct ovs_net), 2360 }; 2361 2362 static int __init dp_init(void) 2363 { 2364 int err; 2365 2366 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); 2367 2368 pr_info("Open vSwitch switching datapath\n"); 2369 2370 err = action_fifos_init(); 2371 if (err) 2372 goto error; 2373 2374 err = ovs_internal_dev_rtnl_link_register(); 2375 if (err) 2376 goto error_action_fifos_exit; 2377 2378 err = ovs_flow_init(); 2379 if (err) 2380 goto error_unreg_rtnl_link; 2381 2382 err = ovs_vport_init(); 2383 if (err) 2384 goto error_flow_exit; 2385 2386 err = register_pernet_device(&ovs_net_ops); 2387 if (err) 2388 goto error_vport_exit; 2389 2390 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2391 if (err) 2392 goto error_netns_exit; 2393 2394 err = ovs_netdev_init(); 2395 if (err) 2396 goto error_unreg_notifier; 2397 2398 err = dp_register_genl(); 2399 if (err < 0) 2400 goto error_unreg_netdev; 2401 2402 return 0; 2403 2404 error_unreg_netdev: 2405 ovs_netdev_exit(); 2406 error_unreg_notifier: 2407 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2408 error_netns_exit: 2409 unregister_pernet_device(&ovs_net_ops); 2410 error_vport_exit: 2411 ovs_vport_exit(); 2412 error_flow_exit: 2413 ovs_flow_exit(); 2414 error_unreg_rtnl_link: 2415 ovs_internal_dev_rtnl_link_unregister(); 2416 error_action_fifos_exit: 2417 action_fifos_exit(); 2418 error: 2419 return err; 2420 } 2421 2422 static void dp_cleanup(void) 2423 { 2424 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2425 ovs_netdev_exit(); 2426 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2427 unregister_pernet_device(&ovs_net_ops); 2428 rcu_barrier(); 2429 ovs_vport_exit(); 2430 ovs_flow_exit(); 2431 ovs_internal_dev_rtnl_link_unregister(); 2432 action_fifos_exit(); 2433 } 2434 2435 module_init(dp_init); 2436 module_exit(dp_cleanup); 2437 2438 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2439 MODULE_LICENSE("GPL"); 2440