1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2007-2014 Nicira, Inc. 4 */ 5 6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7 8 #include <linux/init.h> 9 #include <linux/module.h> 10 #include <linux/if_arp.h> 11 #include <linux/if_vlan.h> 12 #include <linux/in.h> 13 #include <linux/ip.h> 14 #include <linux/jhash.h> 15 #include <linux/delay.h> 16 #include <linux/time.h> 17 #include <linux/etherdevice.h> 18 #include <linux/genetlink.h> 19 #include <linux/kernel.h> 20 #include <linux/kthread.h> 21 #include <linux/mutex.h> 22 #include <linux/percpu.h> 23 #include <linux/rcupdate.h> 24 #include <linux/tcp.h> 25 #include <linux/udp.h> 26 #include <linux/ethtool.h> 27 #include <linux/wait.h> 28 #include <asm/div64.h> 29 #include <linux/highmem.h> 30 #include <linux/netfilter_bridge.h> 31 #include <linux/netfilter_ipv4.h> 32 #include <linux/inetdevice.h> 33 #include <linux/list.h> 34 #include <linux/openvswitch.h> 35 #include <linux/rculist.h> 36 #include <linux/dmi.h> 37 #include <net/genetlink.h> 38 #include <net/net_namespace.h> 39 #include <net/netns/generic.h> 40 41 #include "datapath.h" 42 #include "flow.h" 43 #include "flow_table.h" 44 #include "flow_netlink.h" 45 #include "meter.h" 46 #include "openvswitch_trace.h" 47 #include "vport-internal_dev.h" 48 #include "vport-netdev.h" 49 50 unsigned int ovs_net_id __read_mostly; 51 52 static struct genl_family dp_packet_genl_family; 53 static struct genl_family dp_flow_genl_family; 54 static struct genl_family dp_datapath_genl_family; 55 56 static const struct nla_policy flow_policy[]; 57 58 static const struct genl_multicast_group ovs_dp_flow_multicast_group = { 59 .name = OVS_FLOW_MCGROUP, 60 }; 61 62 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = { 63 .name = OVS_DATAPATH_MCGROUP, 64 }; 65 66 static const struct genl_multicast_group ovs_dp_vport_multicast_group = { 67 .name = OVS_VPORT_MCGROUP, 68 }; 69 70 /* Check if need to build a reply message. 71 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */ 72 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info, 73 unsigned int group) 74 { 75 return info->nlhdr->nlmsg_flags & NLM_F_ECHO || 76 genl_has_listeners(family, genl_info_net(info), group); 77 } 78 79 static void ovs_notify(struct genl_family *family, 80 struct sk_buff *skb, struct genl_info *info) 81 { 82 genl_notify(family, skb, info, 0, GFP_KERNEL); 83 } 84 85 /** 86 * DOC: Locking: 87 * 88 * All writes e.g. Writes to device state (add/remove datapath, port, set 89 * operations on vports, etc.), Writes to other state (flow table 90 * modifications, set miscellaneous datapath parameters, etc.) are protected 91 * by ovs_lock. 92 * 93 * Reads are protected by RCU. 94 * 95 * There are a few special cases (mostly stats) that have their own 96 * synchronization but they nest under all of above and don't interact with 97 * each other. 98 * 99 * The RTNL lock nests inside ovs_mutex. 100 */ 101 102 static DEFINE_MUTEX(ovs_mutex); 103 104 void ovs_lock(void) 105 { 106 mutex_lock(&ovs_mutex); 107 } 108 109 void ovs_unlock(void) 110 { 111 mutex_unlock(&ovs_mutex); 112 } 113 114 #ifdef CONFIG_LOCKDEP 115 int lockdep_ovsl_is_held(void) 116 { 117 if (debug_locks) 118 return lockdep_is_held(&ovs_mutex); 119 else 120 return 1; 121 } 122 #endif 123 124 static struct vport *new_vport(const struct vport_parms *); 125 static int queue_gso_packets(struct datapath *dp, struct sk_buff *, 126 const struct sw_flow_key *, 127 const struct dp_upcall_info *, 128 uint32_t cutlen); 129 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *, 130 const struct sw_flow_key *, 131 const struct dp_upcall_info *, 132 uint32_t cutlen); 133 134 static void ovs_dp_masks_rebalance(struct work_struct *work); 135 136 static int ovs_dp_set_upcall_portids(struct datapath *, const struct nlattr *); 137 138 /* Must be called with rcu_read_lock or ovs_mutex. */ 139 const char *ovs_dp_name(const struct datapath *dp) 140 { 141 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); 142 return ovs_vport_name(vport); 143 } 144 145 static int get_dpifindex(const struct datapath *dp) 146 { 147 struct vport *local; 148 int ifindex; 149 150 rcu_read_lock(); 151 152 local = ovs_vport_rcu(dp, OVSP_LOCAL); 153 if (local) 154 ifindex = local->dev->ifindex; 155 else 156 ifindex = 0; 157 158 rcu_read_unlock(); 159 160 return ifindex; 161 } 162 163 static void destroy_dp_rcu(struct rcu_head *rcu) 164 { 165 struct datapath *dp = container_of(rcu, struct datapath, rcu); 166 167 ovs_flow_tbl_destroy(&dp->table); 168 free_percpu(dp->stats_percpu); 169 kfree(dp->ports); 170 ovs_meters_exit(dp); 171 kfree(rcu_dereference_raw(dp->upcall_portids)); 172 kfree(dp); 173 } 174 175 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 176 u16 port_no) 177 { 178 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 179 } 180 181 /* Called with ovs_mutex or RCU read lock. */ 182 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 183 { 184 struct vport *vport; 185 struct hlist_head *head; 186 187 head = vport_hash_bucket(dp, port_no); 188 hlist_for_each_entry_rcu(vport, head, dp_hash_node, 189 lockdep_ovsl_is_held()) { 190 if (vport->port_no == port_no) 191 return vport; 192 } 193 return NULL; 194 } 195 196 /* Called with ovs_mutex. */ 197 static struct vport *new_vport(const struct vport_parms *parms) 198 { 199 struct vport *vport; 200 201 vport = ovs_vport_add(parms); 202 if (!IS_ERR(vport)) { 203 struct datapath *dp = parms->dp; 204 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 205 206 hlist_add_head_rcu(&vport->dp_hash_node, head); 207 } 208 return vport; 209 } 210 211 void ovs_dp_detach_port(struct vport *p) 212 { 213 ASSERT_OVSL(); 214 215 /* First drop references to device. */ 216 hlist_del_rcu(&p->dp_hash_node); 217 218 /* Then destroy it. */ 219 ovs_vport_del(p); 220 } 221 222 /* Must be called with rcu_read_lock. */ 223 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key) 224 { 225 const struct vport *p = OVS_CB(skb)->input_vport; 226 struct datapath *dp = p->dp; 227 struct sw_flow *flow; 228 struct sw_flow_actions *sf_acts; 229 struct dp_stats_percpu *stats; 230 u64 *stats_counter; 231 u32 n_mask_hit; 232 u32 n_cache_hit; 233 int error; 234 235 stats = this_cpu_ptr(dp->stats_percpu); 236 237 /* Look up flow. */ 238 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb), 239 &n_mask_hit, &n_cache_hit); 240 if (unlikely(!flow)) { 241 struct dp_upcall_info upcall; 242 243 memset(&upcall, 0, sizeof(upcall)); 244 upcall.cmd = OVS_PACKET_CMD_MISS; 245 246 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU) 247 upcall.portid = 248 ovs_dp_get_upcall_portid(dp, smp_processor_id()); 249 else 250 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 251 252 upcall.mru = OVS_CB(skb)->mru; 253 error = ovs_dp_upcall(dp, skb, key, &upcall, 0); 254 if (unlikely(error)) 255 kfree_skb(skb); 256 else 257 consume_skb(skb); 258 stats_counter = &stats->n_missed; 259 goto out; 260 } 261 262 ovs_flow_stats_update(flow, key->tp.flags, skb); 263 sf_acts = rcu_dereference(flow->sf_acts); 264 error = ovs_execute_actions(dp, skb, sf_acts, key); 265 if (unlikely(error)) 266 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n", 267 ovs_dp_name(dp), error); 268 269 stats_counter = &stats->n_hit; 270 271 out: 272 /* Update datapath statistics. */ 273 u64_stats_update_begin(&stats->syncp); 274 (*stats_counter)++; 275 stats->n_mask_hit += n_mask_hit; 276 stats->n_cache_hit += n_cache_hit; 277 u64_stats_update_end(&stats->syncp); 278 } 279 280 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 281 const struct sw_flow_key *key, 282 const struct dp_upcall_info *upcall_info, 283 uint32_t cutlen) 284 { 285 struct dp_stats_percpu *stats; 286 int err; 287 288 if (trace_ovs_dp_upcall_enabled()) 289 trace_ovs_dp_upcall(dp, skb, key, upcall_info); 290 291 if (upcall_info->portid == 0) { 292 err = -ENOTCONN; 293 goto err; 294 } 295 296 if (!skb_is_gso(skb)) 297 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 298 else 299 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen); 300 if (err) 301 goto err; 302 303 return 0; 304 305 err: 306 stats = this_cpu_ptr(dp->stats_percpu); 307 308 u64_stats_update_begin(&stats->syncp); 309 stats->n_lost++; 310 u64_stats_update_end(&stats->syncp); 311 312 return err; 313 } 314 315 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 316 const struct sw_flow_key *key, 317 const struct dp_upcall_info *upcall_info, 318 uint32_t cutlen) 319 { 320 unsigned int gso_type = skb_shinfo(skb)->gso_type; 321 struct sw_flow_key later_key; 322 struct sk_buff *segs, *nskb; 323 int err; 324 325 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET); 326 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 327 if (IS_ERR(segs)) 328 return PTR_ERR(segs); 329 if (segs == NULL) 330 return -EINVAL; 331 332 if (gso_type & SKB_GSO_UDP) { 333 /* The initial flow key extracted by ovs_flow_key_extract() 334 * in this case is for a first fragment, so we need to 335 * properly mark later fragments. 336 */ 337 later_key = *key; 338 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 339 } 340 341 /* Queue all of the segments. */ 342 skb_list_walk_safe(segs, skb, nskb) { 343 if (gso_type & SKB_GSO_UDP && skb != segs) 344 key = &later_key; 345 346 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 347 if (err) 348 break; 349 350 } 351 352 /* Free all of the segments. */ 353 skb_list_walk_safe(segs, skb, nskb) { 354 if (err) 355 kfree_skb(skb); 356 else 357 consume_skb(skb); 358 } 359 return err; 360 } 361 362 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, 363 unsigned int hdrlen, int actions_attrlen) 364 { 365 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 366 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 367 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */ 368 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */ 369 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */ 370 371 /* OVS_PACKET_ATTR_USERDATA */ 372 if (upcall_info->userdata) 373 size += NLA_ALIGN(upcall_info->userdata->nla_len); 374 375 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ 376 if (upcall_info->egress_tun_info) 377 size += nla_total_size(ovs_tun_key_attr_size()); 378 379 /* OVS_PACKET_ATTR_ACTIONS */ 380 if (upcall_info->actions_len) 381 size += nla_total_size(actions_attrlen); 382 383 /* OVS_PACKET_ATTR_MRU */ 384 if (upcall_info->mru) 385 size += nla_total_size(sizeof(upcall_info->mru)); 386 387 return size; 388 } 389 390 static void pad_packet(struct datapath *dp, struct sk_buff *skb) 391 { 392 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 393 size_t plen = NLA_ALIGN(skb->len) - skb->len; 394 395 if (plen > 0) 396 skb_put_zero(skb, plen); 397 } 398 } 399 400 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 401 const struct sw_flow_key *key, 402 const struct dp_upcall_info *upcall_info, 403 uint32_t cutlen) 404 { 405 struct ovs_header *upcall; 406 struct sk_buff *nskb = NULL; 407 struct sk_buff *user_skb = NULL; /* to be queued to userspace */ 408 struct nlattr *nla; 409 size_t len; 410 unsigned int hlen; 411 int err, dp_ifindex; 412 u64 hash; 413 414 dp_ifindex = get_dpifindex(dp); 415 if (!dp_ifindex) 416 return -ENODEV; 417 418 if (skb_vlan_tag_present(skb)) { 419 nskb = skb_clone(skb, GFP_ATOMIC); 420 if (!nskb) 421 return -ENOMEM; 422 423 nskb = __vlan_hwaccel_push_inside(nskb); 424 if (!nskb) 425 return -ENOMEM; 426 427 skb = nskb; 428 } 429 430 if (nla_attr_size(skb->len) > USHRT_MAX) { 431 err = -EFBIG; 432 goto out; 433 } 434 435 /* Complete checksum if needed */ 436 if (skb->ip_summed == CHECKSUM_PARTIAL && 437 (err = skb_csum_hwoffload_help(skb, 0))) 438 goto out; 439 440 /* Older versions of OVS user space enforce alignment of the last 441 * Netlink attribute to NLA_ALIGNTO which would require extensive 442 * padding logic. Only perform zerocopy if padding is not required. 443 */ 444 if (dp->user_features & OVS_DP_F_UNALIGNED) 445 hlen = skb_zerocopy_headlen(skb); 446 else 447 hlen = skb->len; 448 449 len = upcall_msg_size(upcall_info, hlen - cutlen, 450 OVS_CB(skb)->acts_origlen); 451 user_skb = genlmsg_new(len, GFP_ATOMIC); 452 if (!user_skb) { 453 err = -ENOMEM; 454 goto out; 455 } 456 457 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 458 0, upcall_info->cmd); 459 if (!upcall) { 460 err = -EINVAL; 461 goto out; 462 } 463 upcall->dp_ifindex = dp_ifindex; 464 465 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); 466 if (err) 467 goto out; 468 469 if (upcall_info->userdata) 470 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 471 nla_len(upcall_info->userdata), 472 nla_data(upcall_info->userdata)); 473 474 if (upcall_info->egress_tun_info) { 475 nla = nla_nest_start_noflag(user_skb, 476 OVS_PACKET_ATTR_EGRESS_TUN_KEY); 477 if (!nla) { 478 err = -EMSGSIZE; 479 goto out; 480 } 481 err = ovs_nla_put_tunnel_info(user_skb, 482 upcall_info->egress_tun_info); 483 if (err) 484 goto out; 485 486 nla_nest_end(user_skb, nla); 487 } 488 489 if (upcall_info->actions_len) { 490 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS); 491 if (!nla) { 492 err = -EMSGSIZE; 493 goto out; 494 } 495 err = ovs_nla_put_actions(upcall_info->actions, 496 upcall_info->actions_len, 497 user_skb); 498 if (!err) 499 nla_nest_end(user_skb, nla); 500 else 501 nla_nest_cancel(user_skb, nla); 502 } 503 504 /* Add OVS_PACKET_ATTR_MRU */ 505 if (upcall_info->mru && 506 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) { 507 err = -ENOBUFS; 508 goto out; 509 } 510 511 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */ 512 if (cutlen > 0 && 513 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) { 514 err = -ENOBUFS; 515 goto out; 516 } 517 518 /* Add OVS_PACKET_ATTR_HASH */ 519 hash = skb_get_hash_raw(skb); 520 if (skb->sw_hash) 521 hash |= OVS_PACKET_HASH_SW_BIT; 522 523 if (skb->l4_hash) 524 hash |= OVS_PACKET_HASH_L4_BIT; 525 526 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) { 527 err = -ENOBUFS; 528 goto out; 529 } 530 531 /* Only reserve room for attribute header, packet data is added 532 * in skb_zerocopy() */ 533 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 534 err = -ENOBUFS; 535 goto out; 536 } 537 nla->nla_len = nla_attr_size(skb->len - cutlen); 538 539 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen); 540 if (err) 541 goto out; 542 543 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 544 pad_packet(dp, user_skb); 545 546 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 547 548 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 549 user_skb = NULL; 550 out: 551 if (err) 552 skb_tx_error(skb); 553 kfree_skb(user_skb); 554 kfree_skb(nskb); 555 return err; 556 } 557 558 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 559 { 560 struct ovs_header *ovs_header = info->userhdr; 561 struct net *net = sock_net(skb->sk); 562 struct nlattr **a = info->attrs; 563 struct sw_flow_actions *acts; 564 struct sk_buff *packet; 565 struct sw_flow *flow; 566 struct sw_flow_actions *sf_acts; 567 struct datapath *dp; 568 struct vport *input_vport; 569 u16 mru = 0; 570 u64 hash; 571 int len; 572 int err; 573 bool log = !a[OVS_PACKET_ATTR_PROBE]; 574 575 err = -EINVAL; 576 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 577 !a[OVS_PACKET_ATTR_ACTIONS]) 578 goto err; 579 580 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 581 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 582 err = -ENOMEM; 583 if (!packet) 584 goto err; 585 skb_reserve(packet, NET_IP_ALIGN); 586 587 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 588 589 /* Set packet's mru */ 590 if (a[OVS_PACKET_ATTR_MRU]) { 591 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]); 592 packet->ignore_df = 1; 593 } 594 OVS_CB(packet)->mru = mru; 595 596 if (a[OVS_PACKET_ATTR_HASH]) { 597 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]); 598 599 __skb_set_hash(packet, hash & 0xFFFFFFFFULL, 600 !!(hash & OVS_PACKET_HASH_SW_BIT), 601 !!(hash & OVS_PACKET_HASH_L4_BIT)); 602 } 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 [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 }, 666 }; 667 668 static const struct genl_small_ops dp_packet_genl_ops[] = { 669 { .cmd = OVS_PACKET_CMD_EXECUTE, 670 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 671 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 672 .doit = ovs_packet_cmd_execute 673 } 674 }; 675 676 static struct genl_family dp_packet_genl_family __ro_after_init = { 677 .hdrsize = sizeof(struct ovs_header), 678 .name = OVS_PACKET_FAMILY, 679 .version = OVS_PACKET_VERSION, 680 .maxattr = OVS_PACKET_ATTR_MAX, 681 .policy = packet_policy, 682 .netnsok = true, 683 .parallel_ops = true, 684 .small_ops = dp_packet_genl_ops, 685 .n_small_ops = ARRAY_SIZE(dp_packet_genl_ops), 686 .module = THIS_MODULE, 687 }; 688 689 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 690 struct ovs_dp_megaflow_stats *mega_stats) 691 { 692 int i; 693 694 memset(mega_stats, 0, sizeof(*mega_stats)); 695 696 stats->n_flows = ovs_flow_tbl_count(&dp->table); 697 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 698 699 stats->n_hit = stats->n_missed = stats->n_lost = 0; 700 701 for_each_possible_cpu(i) { 702 const struct dp_stats_percpu *percpu_stats; 703 struct dp_stats_percpu local_stats; 704 unsigned int start; 705 706 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 707 708 do { 709 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 710 local_stats = *percpu_stats; 711 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 712 713 stats->n_hit += local_stats.n_hit; 714 stats->n_missed += local_stats.n_missed; 715 stats->n_lost += local_stats.n_lost; 716 mega_stats->n_mask_hit += local_stats.n_mask_hit; 717 mega_stats->n_cache_hit += local_stats.n_cache_hit; 718 } 719 } 720 721 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) 722 { 723 return ovs_identifier_is_ufid(sfid) && 724 !(ufid_flags & OVS_UFID_F_OMIT_KEY); 725 } 726 727 static bool should_fill_mask(uint32_t ufid_flags) 728 { 729 return !(ufid_flags & OVS_UFID_F_OMIT_MASK); 730 } 731 732 static bool should_fill_actions(uint32_t ufid_flags) 733 { 734 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); 735 } 736 737 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, 738 const struct sw_flow_id *sfid, 739 uint32_t ufid_flags) 740 { 741 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); 742 743 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback 744 * see ovs_nla_put_identifier() 745 */ 746 if (sfid && ovs_identifier_is_ufid(sfid)) 747 len += nla_total_size(sfid->ufid_len); 748 else 749 len += nla_total_size(ovs_key_attr_size()); 750 751 /* OVS_FLOW_ATTR_KEY */ 752 if (!sfid || should_fill_key(sfid, ufid_flags)) 753 len += nla_total_size(ovs_key_attr_size()); 754 755 /* OVS_FLOW_ATTR_MASK */ 756 if (should_fill_mask(ufid_flags)) 757 len += nla_total_size(ovs_key_attr_size()); 758 759 /* OVS_FLOW_ATTR_ACTIONS */ 760 if (should_fill_actions(ufid_flags)) 761 len += nla_total_size(acts->orig_len); 762 763 return len 764 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 765 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 766 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */ 767 } 768 769 /* Called with ovs_mutex or RCU read lock. */ 770 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 771 struct sk_buff *skb) 772 { 773 struct ovs_flow_stats stats; 774 __be16 tcp_flags; 775 unsigned long used; 776 777 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 778 779 if (used && 780 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used), 781 OVS_FLOW_ATTR_PAD)) 782 return -EMSGSIZE; 783 784 if (stats.n_packets && 785 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS, 786 sizeof(struct ovs_flow_stats), &stats, 787 OVS_FLOW_ATTR_PAD)) 788 return -EMSGSIZE; 789 790 if ((u8)ntohs(tcp_flags) && 791 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 792 return -EMSGSIZE; 793 794 return 0; 795 } 796 797 /* Called with ovs_mutex or RCU read lock. */ 798 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 799 struct sk_buff *skb, int skb_orig_len) 800 { 801 struct nlattr *start; 802 int err; 803 804 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 805 * this is the first flow to be dumped into 'skb'. This is unusual for 806 * Netlink but individual action lists can be longer than 807 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 808 * The userspace caller can always fetch the actions separately if it 809 * really wants them. (Most userspace callers in fact don't care.) 810 * 811 * This can only fail for dump operations because the skb is always 812 * properly sized for single flows. 813 */ 814 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS); 815 if (start) { 816 const struct sw_flow_actions *sf_acts; 817 818 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 819 err = ovs_nla_put_actions(sf_acts->actions, 820 sf_acts->actions_len, skb); 821 822 if (!err) 823 nla_nest_end(skb, start); 824 else { 825 if (skb_orig_len) 826 return err; 827 828 nla_nest_cancel(skb, start); 829 } 830 } else if (skb_orig_len) { 831 return -EMSGSIZE; 832 } 833 834 return 0; 835 } 836 837 /* Called with ovs_mutex or RCU read lock. */ 838 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 839 struct sk_buff *skb, u32 portid, 840 u32 seq, u32 flags, u8 cmd, u32 ufid_flags) 841 { 842 const int skb_orig_len = skb->len; 843 struct ovs_header *ovs_header; 844 int err; 845 846 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 847 flags, cmd); 848 if (!ovs_header) 849 return -EMSGSIZE; 850 851 ovs_header->dp_ifindex = dp_ifindex; 852 853 err = ovs_nla_put_identifier(flow, skb); 854 if (err) 855 goto error; 856 857 if (should_fill_key(&flow->id, ufid_flags)) { 858 err = ovs_nla_put_masked_key(flow, skb); 859 if (err) 860 goto error; 861 } 862 863 if (should_fill_mask(ufid_flags)) { 864 err = ovs_nla_put_mask(flow, skb); 865 if (err) 866 goto error; 867 } 868 869 err = ovs_flow_cmd_fill_stats(flow, skb); 870 if (err) 871 goto error; 872 873 if (should_fill_actions(ufid_flags)) { 874 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 875 if (err) 876 goto error; 877 } 878 879 genlmsg_end(skb, ovs_header); 880 return 0; 881 882 error: 883 genlmsg_cancel(skb, ovs_header); 884 return err; 885 } 886 887 /* May not be called with RCU read lock. */ 888 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 889 const struct sw_flow_id *sfid, 890 struct genl_info *info, 891 bool always, 892 uint32_t ufid_flags) 893 { 894 struct sk_buff *skb; 895 size_t len; 896 897 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 898 return NULL; 899 900 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); 901 skb = genlmsg_new(len, GFP_KERNEL); 902 if (!skb) 903 return ERR_PTR(-ENOMEM); 904 905 return skb; 906 } 907 908 /* Called with ovs_mutex. */ 909 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 910 int dp_ifindex, 911 struct genl_info *info, u8 cmd, 912 bool always, u32 ufid_flags) 913 { 914 struct sk_buff *skb; 915 int retval; 916 917 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), 918 &flow->id, info, always, ufid_flags); 919 if (IS_ERR_OR_NULL(skb)) 920 return skb; 921 922 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 923 info->snd_portid, info->snd_seq, 0, 924 cmd, ufid_flags); 925 if (WARN_ON_ONCE(retval < 0)) { 926 kfree_skb(skb); 927 skb = ERR_PTR(retval); 928 } 929 return skb; 930 } 931 932 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 933 { 934 struct net *net = sock_net(skb->sk); 935 struct nlattr **a = info->attrs; 936 struct ovs_header *ovs_header = info->userhdr; 937 struct sw_flow *flow = NULL, *new_flow; 938 struct sw_flow_mask mask; 939 struct sk_buff *reply; 940 struct datapath *dp; 941 struct sw_flow_actions *acts; 942 struct sw_flow_match match; 943 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 944 int error; 945 bool log = !a[OVS_FLOW_ATTR_PROBE]; 946 947 /* Must have key and actions. */ 948 error = -EINVAL; 949 if (!a[OVS_FLOW_ATTR_KEY]) { 950 OVS_NLERR(log, "Flow key attr not present in new flow."); 951 goto error; 952 } 953 if (!a[OVS_FLOW_ATTR_ACTIONS]) { 954 OVS_NLERR(log, "Flow actions attr not present in new flow."); 955 goto error; 956 } 957 958 /* Most of the time we need to allocate a new flow, do it before 959 * locking. 960 */ 961 new_flow = ovs_flow_alloc(); 962 if (IS_ERR(new_flow)) { 963 error = PTR_ERR(new_flow); 964 goto error; 965 } 966 967 /* Extract key. */ 968 ovs_match_init(&match, &new_flow->key, false, &mask); 969 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 970 a[OVS_FLOW_ATTR_MASK], log); 971 if (error) 972 goto err_kfree_flow; 973 974 /* Extract flow identifier. */ 975 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID], 976 &new_flow->key, log); 977 if (error) 978 goto err_kfree_flow; 979 980 /* unmasked key is needed to match when ufid is not used. */ 981 if (ovs_identifier_is_key(&new_flow->id)) 982 match.key = new_flow->id.unmasked_key; 983 984 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask); 985 986 /* Validate actions. */ 987 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS], 988 &new_flow->key, &acts, log); 989 if (error) { 990 OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); 991 goto err_kfree_flow; 992 } 993 994 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false, 995 ufid_flags); 996 if (IS_ERR(reply)) { 997 error = PTR_ERR(reply); 998 goto err_kfree_acts; 999 } 1000 1001 ovs_lock(); 1002 dp = get_dp(net, ovs_header->dp_ifindex); 1003 if (unlikely(!dp)) { 1004 error = -ENODEV; 1005 goto err_unlock_ovs; 1006 } 1007 1008 /* Check if this is a duplicate flow */ 1009 if (ovs_identifier_is_ufid(&new_flow->id)) 1010 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id); 1011 if (!flow) 1012 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key); 1013 if (likely(!flow)) { 1014 rcu_assign_pointer(new_flow->sf_acts, acts); 1015 1016 /* Put flow in bucket. */ 1017 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 1018 if (unlikely(error)) { 1019 acts = NULL; 1020 goto err_unlock_ovs; 1021 } 1022 1023 if (unlikely(reply)) { 1024 error = ovs_flow_cmd_fill_info(new_flow, 1025 ovs_header->dp_ifindex, 1026 reply, info->snd_portid, 1027 info->snd_seq, 0, 1028 OVS_FLOW_CMD_NEW, 1029 ufid_flags); 1030 BUG_ON(error < 0); 1031 } 1032 ovs_unlock(); 1033 } else { 1034 struct sw_flow_actions *old_acts; 1035 1036 /* Bail out if we're not allowed to modify an existing flow. 1037 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 1038 * because Generic Netlink treats the latter as a dump 1039 * request. We also accept NLM_F_EXCL in case that bug ever 1040 * gets fixed. 1041 */ 1042 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 1043 | NLM_F_EXCL))) { 1044 error = -EEXIST; 1045 goto err_unlock_ovs; 1046 } 1047 /* The flow identifier has to be the same for flow updates. 1048 * Look for any overlapping flow. 1049 */ 1050 if (unlikely(!ovs_flow_cmp(flow, &match))) { 1051 if (ovs_identifier_is_key(&flow->id)) 1052 flow = ovs_flow_tbl_lookup_exact(&dp->table, 1053 &match); 1054 else /* UFID matches but key is different */ 1055 flow = NULL; 1056 if (!flow) { 1057 error = -ENOENT; 1058 goto err_unlock_ovs; 1059 } 1060 } 1061 /* Update actions. */ 1062 old_acts = ovsl_dereference(flow->sf_acts); 1063 rcu_assign_pointer(flow->sf_acts, acts); 1064 1065 if (unlikely(reply)) { 1066 error = ovs_flow_cmd_fill_info(flow, 1067 ovs_header->dp_ifindex, 1068 reply, info->snd_portid, 1069 info->snd_seq, 0, 1070 OVS_FLOW_CMD_NEW, 1071 ufid_flags); 1072 BUG_ON(error < 0); 1073 } 1074 ovs_unlock(); 1075 1076 ovs_nla_free_flow_actions_rcu(old_acts); 1077 ovs_flow_free(new_flow, false); 1078 } 1079 1080 if (reply) 1081 ovs_notify(&dp_flow_genl_family, reply, info); 1082 return 0; 1083 1084 err_unlock_ovs: 1085 ovs_unlock(); 1086 kfree_skb(reply); 1087 err_kfree_acts: 1088 ovs_nla_free_flow_actions(acts); 1089 err_kfree_flow: 1090 ovs_flow_free(new_flow, false); 1091 error: 1092 return error; 1093 } 1094 1095 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ 1096 static noinline_for_stack 1097 struct sw_flow_actions *get_flow_actions(struct net *net, 1098 const struct nlattr *a, 1099 const struct sw_flow_key *key, 1100 const struct sw_flow_mask *mask, 1101 bool log) 1102 { 1103 struct sw_flow_actions *acts; 1104 struct sw_flow_key masked_key; 1105 int error; 1106 1107 ovs_flow_mask_key(&masked_key, key, true, mask); 1108 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log); 1109 if (error) { 1110 OVS_NLERR(log, 1111 "Actions may not be safe on all matching packets"); 1112 return ERR_PTR(error); 1113 } 1114 1115 return acts; 1116 } 1117 1118 /* Factor out match-init and action-copy to avoid 1119 * "Wframe-larger-than=1024" warning. Because mask is only 1120 * used to get actions, we new a function to save some 1121 * stack space. 1122 * 1123 * If there are not key and action attrs, we return 0 1124 * directly. In the case, the caller will also not use the 1125 * match as before. If there is action attr, we try to get 1126 * actions and save them to *acts. Before returning from 1127 * the function, we reset the match->mask pointer. Because 1128 * we should not to return match object with dangling reference 1129 * to mask. 1130 * */ 1131 static noinline_for_stack int 1132 ovs_nla_init_match_and_action(struct net *net, 1133 struct sw_flow_match *match, 1134 struct sw_flow_key *key, 1135 struct nlattr **a, 1136 struct sw_flow_actions **acts, 1137 bool log) 1138 { 1139 struct sw_flow_mask mask; 1140 int error = 0; 1141 1142 if (a[OVS_FLOW_ATTR_KEY]) { 1143 ovs_match_init(match, key, true, &mask); 1144 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY], 1145 a[OVS_FLOW_ATTR_MASK], log); 1146 if (error) 1147 goto error; 1148 } 1149 1150 if (a[OVS_FLOW_ATTR_ACTIONS]) { 1151 if (!a[OVS_FLOW_ATTR_KEY]) { 1152 OVS_NLERR(log, 1153 "Flow key attribute not present in set flow."); 1154 error = -EINVAL; 1155 goto error; 1156 } 1157 1158 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key, 1159 &mask, log); 1160 if (IS_ERR(*acts)) { 1161 error = PTR_ERR(*acts); 1162 goto error; 1163 } 1164 } 1165 1166 /* On success, error is 0. */ 1167 error: 1168 match->mask = NULL; 1169 return error; 1170 } 1171 1172 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 1173 { 1174 struct net *net = sock_net(skb->sk); 1175 struct nlattr **a = info->attrs; 1176 struct ovs_header *ovs_header = info->userhdr; 1177 struct sw_flow_key key; 1178 struct sw_flow *flow; 1179 struct sk_buff *reply = NULL; 1180 struct datapath *dp; 1181 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 1182 struct sw_flow_match match; 1183 struct sw_flow_id sfid; 1184 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1185 int error = 0; 1186 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1187 bool ufid_present; 1188 1189 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); 1190 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) { 1191 OVS_NLERR(log, 1192 "Flow set message rejected, Key attribute missing."); 1193 return -EINVAL; 1194 } 1195 1196 error = ovs_nla_init_match_and_action(net, &match, &key, a, 1197 &acts, log); 1198 if (error) 1199 goto error; 1200 1201 if (acts) { 1202 /* Can allocate before locking if have acts. */ 1203 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false, 1204 ufid_flags); 1205 if (IS_ERR(reply)) { 1206 error = PTR_ERR(reply); 1207 goto err_kfree_acts; 1208 } 1209 } 1210 1211 ovs_lock(); 1212 dp = get_dp(net, ovs_header->dp_ifindex); 1213 if (unlikely(!dp)) { 1214 error = -ENODEV; 1215 goto err_unlock_ovs; 1216 } 1217 /* Check that the flow exists. */ 1218 if (ufid_present) 1219 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid); 1220 else 1221 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1222 if (unlikely(!flow)) { 1223 error = -ENOENT; 1224 goto err_unlock_ovs; 1225 } 1226 1227 /* Update actions, if present. */ 1228 if (likely(acts)) { 1229 old_acts = ovsl_dereference(flow->sf_acts); 1230 rcu_assign_pointer(flow->sf_acts, acts); 1231 1232 if (unlikely(reply)) { 1233 error = ovs_flow_cmd_fill_info(flow, 1234 ovs_header->dp_ifindex, 1235 reply, info->snd_portid, 1236 info->snd_seq, 0, 1237 OVS_FLOW_CMD_SET, 1238 ufid_flags); 1239 BUG_ON(error < 0); 1240 } 1241 } else { 1242 /* Could not alloc without acts before locking. */ 1243 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1244 info, OVS_FLOW_CMD_SET, false, 1245 ufid_flags); 1246 1247 if (IS_ERR(reply)) { 1248 error = PTR_ERR(reply); 1249 goto err_unlock_ovs; 1250 } 1251 } 1252 1253 /* Clear stats. */ 1254 if (a[OVS_FLOW_ATTR_CLEAR]) 1255 ovs_flow_stats_clear(flow); 1256 ovs_unlock(); 1257 1258 if (reply) 1259 ovs_notify(&dp_flow_genl_family, reply, info); 1260 if (old_acts) 1261 ovs_nla_free_flow_actions_rcu(old_acts); 1262 1263 return 0; 1264 1265 err_unlock_ovs: 1266 ovs_unlock(); 1267 kfree_skb(reply); 1268 err_kfree_acts: 1269 ovs_nla_free_flow_actions(acts); 1270 error: 1271 return error; 1272 } 1273 1274 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1275 { 1276 struct nlattr **a = info->attrs; 1277 struct ovs_header *ovs_header = info->userhdr; 1278 struct net *net = sock_net(skb->sk); 1279 struct sw_flow_key key; 1280 struct sk_buff *reply; 1281 struct sw_flow *flow; 1282 struct datapath *dp; 1283 struct sw_flow_match match; 1284 struct sw_flow_id ufid; 1285 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1286 int err = 0; 1287 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1288 bool ufid_present; 1289 1290 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1291 if (a[OVS_FLOW_ATTR_KEY]) { 1292 ovs_match_init(&match, &key, true, NULL); 1293 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL, 1294 log); 1295 } else if (!ufid_present) { 1296 OVS_NLERR(log, 1297 "Flow get message rejected, Key attribute missing."); 1298 err = -EINVAL; 1299 } 1300 if (err) 1301 return err; 1302 1303 ovs_lock(); 1304 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1305 if (!dp) { 1306 err = -ENODEV; 1307 goto unlock; 1308 } 1309 1310 if (ufid_present) 1311 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1312 else 1313 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1314 if (!flow) { 1315 err = -ENOENT; 1316 goto unlock; 1317 } 1318 1319 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1320 OVS_FLOW_CMD_GET, true, ufid_flags); 1321 if (IS_ERR(reply)) { 1322 err = PTR_ERR(reply); 1323 goto unlock; 1324 } 1325 1326 ovs_unlock(); 1327 return genlmsg_reply(reply, info); 1328 unlock: 1329 ovs_unlock(); 1330 return err; 1331 } 1332 1333 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1334 { 1335 struct nlattr **a = info->attrs; 1336 struct ovs_header *ovs_header = info->userhdr; 1337 struct net *net = sock_net(skb->sk); 1338 struct sw_flow_key key; 1339 struct sk_buff *reply; 1340 struct sw_flow *flow = NULL; 1341 struct datapath *dp; 1342 struct sw_flow_match match; 1343 struct sw_flow_id ufid; 1344 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1345 int err; 1346 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1347 bool ufid_present; 1348 1349 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1350 if (a[OVS_FLOW_ATTR_KEY]) { 1351 ovs_match_init(&match, &key, true, NULL); 1352 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1353 NULL, log); 1354 if (unlikely(err)) 1355 return err; 1356 } 1357 1358 ovs_lock(); 1359 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1360 if (unlikely(!dp)) { 1361 err = -ENODEV; 1362 goto unlock; 1363 } 1364 1365 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) { 1366 err = ovs_flow_tbl_flush(&dp->table); 1367 goto unlock; 1368 } 1369 1370 if (ufid_present) 1371 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1372 else 1373 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1374 if (unlikely(!flow)) { 1375 err = -ENOENT; 1376 goto unlock; 1377 } 1378 1379 ovs_flow_tbl_remove(&dp->table, flow); 1380 ovs_unlock(); 1381 1382 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1383 &flow->id, info, false, ufid_flags); 1384 if (likely(reply)) { 1385 if (!IS_ERR(reply)) { 1386 rcu_read_lock(); /*To keep RCU checker happy. */ 1387 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1388 reply, info->snd_portid, 1389 info->snd_seq, 0, 1390 OVS_FLOW_CMD_DEL, 1391 ufid_flags); 1392 rcu_read_unlock(); 1393 if (WARN_ON_ONCE(err < 0)) { 1394 kfree_skb(reply); 1395 goto out_free; 1396 } 1397 1398 ovs_notify(&dp_flow_genl_family, reply, info); 1399 } else { 1400 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, 1401 PTR_ERR(reply)); 1402 } 1403 } 1404 1405 out_free: 1406 ovs_flow_free(flow, true); 1407 return 0; 1408 unlock: 1409 ovs_unlock(); 1410 return err; 1411 } 1412 1413 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1414 { 1415 struct nlattr *a[__OVS_FLOW_ATTR_MAX]; 1416 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1417 struct table_instance *ti; 1418 struct datapath *dp; 1419 u32 ufid_flags; 1420 int err; 1421 1422 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a, 1423 OVS_FLOW_ATTR_MAX, flow_policy, NULL); 1424 if (err) 1425 return err; 1426 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1427 1428 rcu_read_lock(); 1429 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1430 if (!dp) { 1431 rcu_read_unlock(); 1432 return -ENODEV; 1433 } 1434 1435 ti = rcu_dereference(dp->table.ti); 1436 for (;;) { 1437 struct sw_flow *flow; 1438 u32 bucket, obj; 1439 1440 bucket = cb->args[0]; 1441 obj = cb->args[1]; 1442 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1443 if (!flow) 1444 break; 1445 1446 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1447 NETLINK_CB(cb->skb).portid, 1448 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1449 OVS_FLOW_CMD_GET, ufid_flags) < 0) 1450 break; 1451 1452 cb->args[0] = bucket; 1453 cb->args[1] = obj; 1454 } 1455 rcu_read_unlock(); 1456 return skb->len; 1457 } 1458 1459 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1460 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1461 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1462 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1463 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1464 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1465 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, 1466 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, 1467 }; 1468 1469 static const struct genl_small_ops dp_flow_genl_ops[] = { 1470 { .cmd = OVS_FLOW_CMD_NEW, 1471 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1472 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1473 .doit = ovs_flow_cmd_new 1474 }, 1475 { .cmd = OVS_FLOW_CMD_DEL, 1476 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1477 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1478 .doit = ovs_flow_cmd_del 1479 }, 1480 { .cmd = OVS_FLOW_CMD_GET, 1481 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1482 .flags = 0, /* OK for unprivileged users. */ 1483 .doit = ovs_flow_cmd_get, 1484 .dumpit = ovs_flow_cmd_dump 1485 }, 1486 { .cmd = OVS_FLOW_CMD_SET, 1487 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1488 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1489 .doit = ovs_flow_cmd_set, 1490 }, 1491 }; 1492 1493 static struct genl_family dp_flow_genl_family __ro_after_init = { 1494 .hdrsize = sizeof(struct ovs_header), 1495 .name = OVS_FLOW_FAMILY, 1496 .version = OVS_FLOW_VERSION, 1497 .maxattr = OVS_FLOW_ATTR_MAX, 1498 .policy = flow_policy, 1499 .netnsok = true, 1500 .parallel_ops = true, 1501 .small_ops = dp_flow_genl_ops, 1502 .n_small_ops = ARRAY_SIZE(dp_flow_genl_ops), 1503 .mcgrps = &ovs_dp_flow_multicast_group, 1504 .n_mcgrps = 1, 1505 .module = THIS_MODULE, 1506 }; 1507 1508 static size_t ovs_dp_cmd_msg_size(void) 1509 { 1510 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1511 1512 msgsize += nla_total_size(IFNAMSIZ); 1513 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats)); 1514 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats)); 1515 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1516 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */ 1517 1518 return msgsize; 1519 } 1520 1521 /* Called with ovs_mutex. */ 1522 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1523 u32 portid, u32 seq, u32 flags, u8 cmd) 1524 { 1525 struct ovs_header *ovs_header; 1526 struct ovs_dp_stats dp_stats; 1527 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1528 int err; 1529 1530 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1531 flags, cmd); 1532 if (!ovs_header) 1533 goto error; 1534 1535 ovs_header->dp_ifindex = get_dpifindex(dp); 1536 1537 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1538 if (err) 1539 goto nla_put_failure; 1540 1541 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1542 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1543 &dp_stats, OVS_DP_ATTR_PAD)) 1544 goto nla_put_failure; 1545 1546 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1547 sizeof(struct ovs_dp_megaflow_stats), 1548 &dp_megaflow_stats, OVS_DP_ATTR_PAD)) 1549 goto nla_put_failure; 1550 1551 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1552 goto nla_put_failure; 1553 1554 if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE, 1555 ovs_flow_tbl_masks_cache_size(&dp->table))) 1556 goto nla_put_failure; 1557 1558 genlmsg_end(skb, ovs_header); 1559 return 0; 1560 1561 nla_put_failure: 1562 genlmsg_cancel(skb, ovs_header); 1563 error: 1564 return -EMSGSIZE; 1565 } 1566 1567 static struct sk_buff *ovs_dp_cmd_alloc_info(void) 1568 { 1569 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL); 1570 } 1571 1572 /* Called with rcu_read_lock or ovs_mutex. */ 1573 static struct datapath *lookup_datapath(struct net *net, 1574 const struct ovs_header *ovs_header, 1575 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1576 { 1577 struct datapath *dp; 1578 1579 if (!a[OVS_DP_ATTR_NAME]) 1580 dp = get_dp(net, ovs_header->dp_ifindex); 1581 else { 1582 struct vport *vport; 1583 1584 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1585 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1586 } 1587 return dp ? dp : ERR_PTR(-ENODEV); 1588 } 1589 1590 static void ovs_dp_reset_user_features(struct sk_buff *skb, 1591 struct genl_info *info) 1592 { 1593 struct datapath *dp; 1594 1595 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, 1596 info->attrs); 1597 if (IS_ERR(dp)) 1598 return; 1599 1600 WARN(dp->user_features, "Dropping previously announced user features\n"); 1601 dp->user_features = 0; 1602 } 1603 1604 DEFINE_STATIC_KEY_FALSE(tc_recirc_sharing_support); 1605 1606 static int ovs_dp_set_upcall_portids(struct datapath *dp, 1607 const struct nlattr *ids) 1608 { 1609 struct dp_nlsk_pids *old, *dp_nlsk_pids; 1610 1611 if (!nla_len(ids) || nla_len(ids) % sizeof(u32)) 1612 return -EINVAL; 1613 1614 old = ovsl_dereference(dp->upcall_portids); 1615 1616 dp_nlsk_pids = kmalloc(sizeof(*dp_nlsk_pids) + nla_len(ids), 1617 GFP_KERNEL); 1618 if (!dp_nlsk_pids) 1619 return -ENOMEM; 1620 1621 dp_nlsk_pids->n_pids = nla_len(ids) / sizeof(u32); 1622 nla_memcpy(dp_nlsk_pids->pids, ids, nla_len(ids)); 1623 1624 rcu_assign_pointer(dp->upcall_portids, dp_nlsk_pids); 1625 1626 kfree_rcu(old, rcu); 1627 1628 return 0; 1629 } 1630 1631 u32 ovs_dp_get_upcall_portid(const struct datapath *dp, uint32_t cpu_id) 1632 { 1633 struct dp_nlsk_pids *dp_nlsk_pids; 1634 1635 dp_nlsk_pids = rcu_dereference(dp->upcall_portids); 1636 1637 if (dp_nlsk_pids) { 1638 if (cpu_id < dp_nlsk_pids->n_pids) { 1639 return dp_nlsk_pids->pids[cpu_id]; 1640 } else if (dp_nlsk_pids->n_pids > 0 && 1641 cpu_id >= dp_nlsk_pids->n_pids) { 1642 /* If the number of netlink PIDs is mismatched with 1643 * the number of CPUs as seen by the kernel, log this 1644 * and send the upcall to an arbitrary socket (0) in 1645 * order to not drop packets 1646 */ 1647 pr_info_ratelimited("cpu_id mismatch with handler threads"); 1648 return dp_nlsk_pids->pids[cpu_id % 1649 dp_nlsk_pids->n_pids]; 1650 } else { 1651 return 0; 1652 } 1653 } else { 1654 return 0; 1655 } 1656 } 1657 1658 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1659 { 1660 u32 user_features = 0; 1661 int err; 1662 1663 if (a[OVS_DP_ATTR_USER_FEATURES]) { 1664 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1665 1666 if (user_features & ~(OVS_DP_F_VPORT_PIDS | 1667 OVS_DP_F_UNALIGNED | 1668 OVS_DP_F_TC_RECIRC_SHARING | 1669 OVS_DP_F_DISPATCH_UPCALL_PER_CPU)) 1670 return -EOPNOTSUPP; 1671 1672 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT) 1673 if (user_features & OVS_DP_F_TC_RECIRC_SHARING) 1674 return -EOPNOTSUPP; 1675 #endif 1676 } 1677 1678 if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) { 1679 int err; 1680 u32 cache_size; 1681 1682 cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]); 1683 err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size); 1684 if (err) 1685 return err; 1686 } 1687 1688 dp->user_features = user_features; 1689 1690 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU && 1691 a[OVS_DP_ATTR_PER_CPU_PIDS]) { 1692 /* Upcall Netlink Port IDs have been updated */ 1693 err = ovs_dp_set_upcall_portids(dp, 1694 a[OVS_DP_ATTR_PER_CPU_PIDS]); 1695 if (err) 1696 return err; 1697 } 1698 1699 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) 1700 static_branch_enable(&tc_recirc_sharing_support); 1701 else 1702 static_branch_disable(&tc_recirc_sharing_support); 1703 1704 return 0; 1705 } 1706 1707 static int ovs_dp_stats_init(struct datapath *dp) 1708 { 1709 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1710 if (!dp->stats_percpu) 1711 return -ENOMEM; 1712 1713 return 0; 1714 } 1715 1716 static int ovs_dp_vport_init(struct datapath *dp) 1717 { 1718 int i; 1719 1720 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS, 1721 sizeof(struct hlist_head), 1722 GFP_KERNEL); 1723 if (!dp->ports) 1724 return -ENOMEM; 1725 1726 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1727 INIT_HLIST_HEAD(&dp->ports[i]); 1728 1729 return 0; 1730 } 1731 1732 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1733 { 1734 struct nlattr **a = info->attrs; 1735 struct vport_parms parms; 1736 struct sk_buff *reply; 1737 struct datapath *dp; 1738 struct vport *vport; 1739 struct ovs_net *ovs_net; 1740 int err; 1741 1742 err = -EINVAL; 1743 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1744 goto err; 1745 1746 reply = ovs_dp_cmd_alloc_info(); 1747 if (!reply) 1748 return -ENOMEM; 1749 1750 err = -ENOMEM; 1751 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1752 if (dp == NULL) 1753 goto err_destroy_reply; 1754 1755 ovs_dp_set_net(dp, sock_net(skb->sk)); 1756 1757 /* Allocate table. */ 1758 err = ovs_flow_tbl_init(&dp->table); 1759 if (err) 1760 goto err_destroy_dp; 1761 1762 err = ovs_dp_stats_init(dp); 1763 if (err) 1764 goto err_destroy_table; 1765 1766 err = ovs_dp_vport_init(dp); 1767 if (err) 1768 goto err_destroy_stats; 1769 1770 err = ovs_meters_init(dp); 1771 if (err) 1772 goto err_destroy_ports; 1773 1774 /* Set up our datapath device. */ 1775 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1776 parms.type = OVS_VPORT_TYPE_INTERNAL; 1777 parms.options = NULL; 1778 parms.dp = dp; 1779 parms.port_no = OVSP_LOCAL; 1780 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1781 1782 /* So far only local changes have been made, now need the lock. */ 1783 ovs_lock(); 1784 1785 err = ovs_dp_change(dp, a); 1786 if (err) 1787 goto err_unlock_and_destroy_meters; 1788 1789 vport = new_vport(&parms); 1790 if (IS_ERR(vport)) { 1791 err = PTR_ERR(vport); 1792 if (err == -EBUSY) 1793 err = -EEXIST; 1794 1795 if (err == -EEXIST) { 1796 /* An outdated user space instance that does not understand 1797 * the concept of user_features has attempted to create a new 1798 * datapath and is likely to reuse it. Drop all user features. 1799 */ 1800 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1801 ovs_dp_reset_user_features(skb, info); 1802 } 1803 1804 goto err_unlock_and_destroy_meters; 1805 } 1806 1807 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1808 info->snd_seq, 0, OVS_DP_CMD_NEW); 1809 BUG_ON(err < 0); 1810 1811 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1812 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1813 1814 ovs_unlock(); 1815 1816 ovs_notify(&dp_datapath_genl_family, reply, info); 1817 return 0; 1818 1819 err_unlock_and_destroy_meters: 1820 ovs_unlock(); 1821 ovs_meters_exit(dp); 1822 err_destroy_ports: 1823 kfree(dp->ports); 1824 err_destroy_stats: 1825 free_percpu(dp->stats_percpu); 1826 err_destroy_table: 1827 ovs_flow_tbl_destroy(&dp->table); 1828 err_destroy_dp: 1829 kfree(dp); 1830 err_destroy_reply: 1831 kfree_skb(reply); 1832 err: 1833 return err; 1834 } 1835 1836 /* Called with ovs_mutex. */ 1837 static void __dp_destroy(struct datapath *dp) 1838 { 1839 struct flow_table *table = &dp->table; 1840 int i; 1841 1842 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1843 struct vport *vport; 1844 struct hlist_node *n; 1845 1846 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1847 if (vport->port_no != OVSP_LOCAL) 1848 ovs_dp_detach_port(vport); 1849 } 1850 1851 list_del_rcu(&dp->list_node); 1852 1853 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1854 * all ports in datapath are destroyed first before freeing datapath. 1855 */ 1856 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1857 1858 /* Flush sw_flow in the tables. RCU cb only releases resource 1859 * such as dp, ports and tables. That may avoid some issues 1860 * such as RCU usage warning. 1861 */ 1862 table_instance_flow_flush(table, ovsl_dereference(table->ti), 1863 ovsl_dereference(table->ufid_ti)); 1864 1865 /* RCU destroy the ports, meters and flow tables. */ 1866 call_rcu(&dp->rcu, destroy_dp_rcu); 1867 } 1868 1869 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1870 { 1871 struct sk_buff *reply; 1872 struct datapath *dp; 1873 int err; 1874 1875 reply = ovs_dp_cmd_alloc_info(); 1876 if (!reply) 1877 return -ENOMEM; 1878 1879 ovs_lock(); 1880 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1881 err = PTR_ERR(dp); 1882 if (IS_ERR(dp)) 1883 goto err_unlock_free; 1884 1885 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1886 info->snd_seq, 0, OVS_DP_CMD_DEL); 1887 BUG_ON(err < 0); 1888 1889 __dp_destroy(dp); 1890 ovs_unlock(); 1891 1892 ovs_notify(&dp_datapath_genl_family, reply, info); 1893 1894 return 0; 1895 1896 err_unlock_free: 1897 ovs_unlock(); 1898 kfree_skb(reply); 1899 return err; 1900 } 1901 1902 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1903 { 1904 struct sk_buff *reply; 1905 struct datapath *dp; 1906 int err; 1907 1908 reply = ovs_dp_cmd_alloc_info(); 1909 if (!reply) 1910 return -ENOMEM; 1911 1912 ovs_lock(); 1913 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1914 err = PTR_ERR(dp); 1915 if (IS_ERR(dp)) 1916 goto err_unlock_free; 1917 1918 err = ovs_dp_change(dp, info->attrs); 1919 if (err) 1920 goto err_unlock_free; 1921 1922 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1923 info->snd_seq, 0, OVS_DP_CMD_SET); 1924 BUG_ON(err < 0); 1925 1926 ovs_unlock(); 1927 ovs_notify(&dp_datapath_genl_family, reply, info); 1928 1929 return 0; 1930 1931 err_unlock_free: 1932 ovs_unlock(); 1933 kfree_skb(reply); 1934 return err; 1935 } 1936 1937 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1938 { 1939 struct sk_buff *reply; 1940 struct datapath *dp; 1941 int err; 1942 1943 reply = ovs_dp_cmd_alloc_info(); 1944 if (!reply) 1945 return -ENOMEM; 1946 1947 ovs_lock(); 1948 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1949 if (IS_ERR(dp)) { 1950 err = PTR_ERR(dp); 1951 goto err_unlock_free; 1952 } 1953 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1954 info->snd_seq, 0, OVS_DP_CMD_GET); 1955 BUG_ON(err < 0); 1956 ovs_unlock(); 1957 1958 return genlmsg_reply(reply, info); 1959 1960 err_unlock_free: 1961 ovs_unlock(); 1962 kfree_skb(reply); 1963 return err; 1964 } 1965 1966 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1967 { 1968 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1969 struct datapath *dp; 1970 int skip = cb->args[0]; 1971 int i = 0; 1972 1973 ovs_lock(); 1974 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1975 if (i >= skip && 1976 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1977 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1978 OVS_DP_CMD_GET) < 0) 1979 break; 1980 i++; 1981 } 1982 ovs_unlock(); 1983 1984 cb->args[0] = i; 1985 1986 return skb->len; 1987 } 1988 1989 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1990 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1991 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1992 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1993 [OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0, 1994 PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)), 1995 }; 1996 1997 static const struct genl_small_ops dp_datapath_genl_ops[] = { 1998 { .cmd = OVS_DP_CMD_NEW, 1999 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2000 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2001 .doit = ovs_dp_cmd_new 2002 }, 2003 { .cmd = OVS_DP_CMD_DEL, 2004 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2005 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2006 .doit = ovs_dp_cmd_del 2007 }, 2008 { .cmd = OVS_DP_CMD_GET, 2009 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2010 .flags = 0, /* OK for unprivileged users. */ 2011 .doit = ovs_dp_cmd_get, 2012 .dumpit = ovs_dp_cmd_dump 2013 }, 2014 { .cmd = OVS_DP_CMD_SET, 2015 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2016 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2017 .doit = ovs_dp_cmd_set, 2018 }, 2019 }; 2020 2021 static struct genl_family dp_datapath_genl_family __ro_after_init = { 2022 .hdrsize = sizeof(struct ovs_header), 2023 .name = OVS_DATAPATH_FAMILY, 2024 .version = OVS_DATAPATH_VERSION, 2025 .maxattr = OVS_DP_ATTR_MAX, 2026 .policy = datapath_policy, 2027 .netnsok = true, 2028 .parallel_ops = true, 2029 .small_ops = dp_datapath_genl_ops, 2030 .n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops), 2031 .mcgrps = &ovs_dp_datapath_multicast_group, 2032 .n_mcgrps = 1, 2033 .module = THIS_MODULE, 2034 }; 2035 2036 /* Called with ovs_mutex or RCU read lock. */ 2037 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 2038 struct net *net, u32 portid, u32 seq, 2039 u32 flags, u8 cmd, gfp_t gfp) 2040 { 2041 struct ovs_header *ovs_header; 2042 struct ovs_vport_stats vport_stats; 2043 int err; 2044 2045 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 2046 flags, cmd); 2047 if (!ovs_header) 2048 return -EMSGSIZE; 2049 2050 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 2051 2052 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 2053 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 2054 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 2055 ovs_vport_name(vport)) || 2056 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex)) 2057 goto nla_put_failure; 2058 2059 if (!net_eq(net, dev_net(vport->dev))) { 2060 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp); 2061 2062 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id)) 2063 goto nla_put_failure; 2064 } 2065 2066 ovs_vport_get_stats(vport, &vport_stats); 2067 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS, 2068 sizeof(struct ovs_vport_stats), &vport_stats, 2069 OVS_VPORT_ATTR_PAD)) 2070 goto nla_put_failure; 2071 2072 if (ovs_vport_get_upcall_portids(vport, skb)) 2073 goto nla_put_failure; 2074 2075 err = ovs_vport_get_options(vport, skb); 2076 if (err == -EMSGSIZE) 2077 goto error; 2078 2079 genlmsg_end(skb, ovs_header); 2080 return 0; 2081 2082 nla_put_failure: 2083 err = -EMSGSIZE; 2084 error: 2085 genlmsg_cancel(skb, ovs_header); 2086 return err; 2087 } 2088 2089 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 2090 { 2091 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2092 } 2093 2094 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 2095 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net, 2096 u32 portid, u32 seq, u8 cmd) 2097 { 2098 struct sk_buff *skb; 2099 int retval; 2100 2101 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2102 if (!skb) 2103 return ERR_PTR(-ENOMEM); 2104 2105 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd, 2106 GFP_KERNEL); 2107 BUG_ON(retval < 0); 2108 2109 return skb; 2110 } 2111 2112 /* Called with ovs_mutex or RCU read lock. */ 2113 static struct vport *lookup_vport(struct net *net, 2114 const struct ovs_header *ovs_header, 2115 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 2116 { 2117 struct datapath *dp; 2118 struct vport *vport; 2119 2120 if (a[OVS_VPORT_ATTR_IFINDEX]) 2121 return ERR_PTR(-EOPNOTSUPP); 2122 if (a[OVS_VPORT_ATTR_NAME]) { 2123 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 2124 if (!vport) 2125 return ERR_PTR(-ENODEV); 2126 if (ovs_header->dp_ifindex && 2127 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 2128 return ERR_PTR(-ENODEV); 2129 return vport; 2130 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 2131 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 2132 2133 if (port_no >= DP_MAX_PORTS) 2134 return ERR_PTR(-EFBIG); 2135 2136 dp = get_dp(net, ovs_header->dp_ifindex); 2137 if (!dp) 2138 return ERR_PTR(-ENODEV); 2139 2140 vport = ovs_vport_ovsl_rcu(dp, port_no); 2141 if (!vport) 2142 return ERR_PTR(-ENODEV); 2143 return vport; 2144 } else 2145 return ERR_PTR(-EINVAL); 2146 2147 } 2148 2149 static unsigned int ovs_get_max_headroom(struct datapath *dp) 2150 { 2151 unsigned int dev_headroom, max_headroom = 0; 2152 struct net_device *dev; 2153 struct vport *vport; 2154 int i; 2155 2156 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2157 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, 2158 lockdep_ovsl_is_held()) { 2159 dev = vport->dev; 2160 dev_headroom = netdev_get_fwd_headroom(dev); 2161 if (dev_headroom > max_headroom) 2162 max_headroom = dev_headroom; 2163 } 2164 } 2165 2166 return max_headroom; 2167 } 2168 2169 /* Called with ovs_mutex */ 2170 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom) 2171 { 2172 struct vport *vport; 2173 int i; 2174 2175 dp->max_headroom = new_headroom; 2176 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2177 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, 2178 lockdep_ovsl_is_held()) 2179 netdev_set_rx_headroom(vport->dev, new_headroom); 2180 } 2181 } 2182 2183 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 2184 { 2185 struct nlattr **a = info->attrs; 2186 struct ovs_header *ovs_header = info->userhdr; 2187 struct vport_parms parms; 2188 struct sk_buff *reply; 2189 struct vport *vport; 2190 struct datapath *dp; 2191 unsigned int new_headroom; 2192 u32 port_no; 2193 int err; 2194 2195 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 2196 !a[OVS_VPORT_ATTR_UPCALL_PID]) 2197 return -EINVAL; 2198 if (a[OVS_VPORT_ATTR_IFINDEX]) 2199 return -EOPNOTSUPP; 2200 2201 port_no = a[OVS_VPORT_ATTR_PORT_NO] 2202 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 2203 if (port_no >= DP_MAX_PORTS) 2204 return -EFBIG; 2205 2206 reply = ovs_vport_cmd_alloc_info(); 2207 if (!reply) 2208 return -ENOMEM; 2209 2210 ovs_lock(); 2211 restart: 2212 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 2213 err = -ENODEV; 2214 if (!dp) 2215 goto exit_unlock_free; 2216 2217 if (port_no) { 2218 vport = ovs_vport_ovsl(dp, port_no); 2219 err = -EBUSY; 2220 if (vport) 2221 goto exit_unlock_free; 2222 } else { 2223 for (port_no = 1; ; port_no++) { 2224 if (port_no >= DP_MAX_PORTS) { 2225 err = -EFBIG; 2226 goto exit_unlock_free; 2227 } 2228 vport = ovs_vport_ovsl(dp, port_no); 2229 if (!vport) 2230 break; 2231 } 2232 } 2233 2234 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 2235 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 2236 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 2237 parms.dp = dp; 2238 parms.port_no = port_no; 2239 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2240 2241 vport = new_vport(&parms); 2242 err = PTR_ERR(vport); 2243 if (IS_ERR(vport)) { 2244 if (err == -EAGAIN) 2245 goto restart; 2246 goto exit_unlock_free; 2247 } 2248 2249 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2250 info->snd_portid, info->snd_seq, 0, 2251 OVS_VPORT_CMD_NEW, GFP_KERNEL); 2252 2253 new_headroom = netdev_get_fwd_headroom(vport->dev); 2254 2255 if (new_headroom > dp->max_headroom) 2256 ovs_update_headroom(dp, new_headroom); 2257 else 2258 netdev_set_rx_headroom(vport->dev, dp->max_headroom); 2259 2260 BUG_ON(err < 0); 2261 ovs_unlock(); 2262 2263 ovs_notify(&dp_vport_genl_family, reply, info); 2264 return 0; 2265 2266 exit_unlock_free: 2267 ovs_unlock(); 2268 kfree_skb(reply); 2269 return err; 2270 } 2271 2272 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 2273 { 2274 struct nlattr **a = info->attrs; 2275 struct sk_buff *reply; 2276 struct vport *vport; 2277 int err; 2278 2279 reply = ovs_vport_cmd_alloc_info(); 2280 if (!reply) 2281 return -ENOMEM; 2282 2283 ovs_lock(); 2284 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2285 err = PTR_ERR(vport); 2286 if (IS_ERR(vport)) 2287 goto exit_unlock_free; 2288 2289 if (a[OVS_VPORT_ATTR_TYPE] && 2290 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 2291 err = -EINVAL; 2292 goto exit_unlock_free; 2293 } 2294 2295 if (a[OVS_VPORT_ATTR_OPTIONS]) { 2296 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 2297 if (err) 2298 goto exit_unlock_free; 2299 } 2300 2301 2302 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 2303 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2304 2305 err = ovs_vport_set_upcall_portids(vport, ids); 2306 if (err) 2307 goto exit_unlock_free; 2308 } 2309 2310 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2311 info->snd_portid, info->snd_seq, 0, 2312 OVS_VPORT_CMD_SET, GFP_KERNEL); 2313 BUG_ON(err < 0); 2314 2315 ovs_unlock(); 2316 ovs_notify(&dp_vport_genl_family, reply, info); 2317 return 0; 2318 2319 exit_unlock_free: 2320 ovs_unlock(); 2321 kfree_skb(reply); 2322 return err; 2323 } 2324 2325 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2326 { 2327 bool update_headroom = false; 2328 struct nlattr **a = info->attrs; 2329 struct sk_buff *reply; 2330 struct datapath *dp; 2331 struct vport *vport; 2332 unsigned int new_headroom; 2333 int err; 2334 2335 reply = ovs_vport_cmd_alloc_info(); 2336 if (!reply) 2337 return -ENOMEM; 2338 2339 ovs_lock(); 2340 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2341 err = PTR_ERR(vport); 2342 if (IS_ERR(vport)) 2343 goto exit_unlock_free; 2344 2345 if (vport->port_no == OVSP_LOCAL) { 2346 err = -EINVAL; 2347 goto exit_unlock_free; 2348 } 2349 2350 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2351 info->snd_portid, info->snd_seq, 0, 2352 OVS_VPORT_CMD_DEL, GFP_KERNEL); 2353 BUG_ON(err < 0); 2354 2355 /* the vport deletion may trigger dp headroom update */ 2356 dp = vport->dp; 2357 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom) 2358 update_headroom = true; 2359 2360 netdev_reset_rx_headroom(vport->dev); 2361 ovs_dp_detach_port(vport); 2362 2363 if (update_headroom) { 2364 new_headroom = ovs_get_max_headroom(dp); 2365 2366 if (new_headroom < dp->max_headroom) 2367 ovs_update_headroom(dp, new_headroom); 2368 } 2369 ovs_unlock(); 2370 2371 ovs_notify(&dp_vport_genl_family, reply, info); 2372 return 0; 2373 2374 exit_unlock_free: 2375 ovs_unlock(); 2376 kfree_skb(reply); 2377 return err; 2378 } 2379 2380 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2381 { 2382 struct nlattr **a = info->attrs; 2383 struct ovs_header *ovs_header = info->userhdr; 2384 struct sk_buff *reply; 2385 struct vport *vport; 2386 int err; 2387 2388 reply = ovs_vport_cmd_alloc_info(); 2389 if (!reply) 2390 return -ENOMEM; 2391 2392 rcu_read_lock(); 2393 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2394 err = PTR_ERR(vport); 2395 if (IS_ERR(vport)) 2396 goto exit_unlock_free; 2397 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2398 info->snd_portid, info->snd_seq, 0, 2399 OVS_VPORT_CMD_GET, GFP_ATOMIC); 2400 BUG_ON(err < 0); 2401 rcu_read_unlock(); 2402 2403 return genlmsg_reply(reply, info); 2404 2405 exit_unlock_free: 2406 rcu_read_unlock(); 2407 kfree_skb(reply); 2408 return err; 2409 } 2410 2411 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2412 { 2413 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2414 struct datapath *dp; 2415 int bucket = cb->args[0], skip = cb->args[1]; 2416 int i, j = 0; 2417 2418 rcu_read_lock(); 2419 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2420 if (!dp) { 2421 rcu_read_unlock(); 2422 return -ENODEV; 2423 } 2424 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2425 struct vport *vport; 2426 2427 j = 0; 2428 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2429 if (j >= skip && 2430 ovs_vport_cmd_fill_info(vport, skb, 2431 sock_net(skb->sk), 2432 NETLINK_CB(cb->skb).portid, 2433 cb->nlh->nlmsg_seq, 2434 NLM_F_MULTI, 2435 OVS_VPORT_CMD_GET, 2436 GFP_ATOMIC) < 0) 2437 goto out; 2438 2439 j++; 2440 } 2441 skip = 0; 2442 } 2443 out: 2444 rcu_read_unlock(); 2445 2446 cb->args[0] = i; 2447 cb->args[1] = j; 2448 2449 return skb->len; 2450 } 2451 2452 static void ovs_dp_masks_rebalance(struct work_struct *work) 2453 { 2454 struct ovs_net *ovs_net = container_of(work, struct ovs_net, 2455 masks_rebalance.work); 2456 struct datapath *dp; 2457 2458 ovs_lock(); 2459 2460 list_for_each_entry(dp, &ovs_net->dps, list_node) 2461 ovs_flow_masks_rebalance(&dp->table); 2462 2463 ovs_unlock(); 2464 2465 schedule_delayed_work(&ovs_net->masks_rebalance, 2466 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL)); 2467 } 2468 2469 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2470 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2471 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2472 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2473 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2474 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC }, 2475 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2476 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 }, 2477 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 }, 2478 }; 2479 2480 static const struct genl_small_ops dp_vport_genl_ops[] = { 2481 { .cmd = OVS_VPORT_CMD_NEW, 2482 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2483 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2484 .doit = ovs_vport_cmd_new 2485 }, 2486 { .cmd = OVS_VPORT_CMD_DEL, 2487 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2488 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2489 .doit = ovs_vport_cmd_del 2490 }, 2491 { .cmd = OVS_VPORT_CMD_GET, 2492 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2493 .flags = 0, /* OK for unprivileged users. */ 2494 .doit = ovs_vport_cmd_get, 2495 .dumpit = ovs_vport_cmd_dump 2496 }, 2497 { .cmd = OVS_VPORT_CMD_SET, 2498 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2499 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2500 .doit = ovs_vport_cmd_set, 2501 }, 2502 }; 2503 2504 struct genl_family dp_vport_genl_family __ro_after_init = { 2505 .hdrsize = sizeof(struct ovs_header), 2506 .name = OVS_VPORT_FAMILY, 2507 .version = OVS_VPORT_VERSION, 2508 .maxattr = OVS_VPORT_ATTR_MAX, 2509 .policy = vport_policy, 2510 .netnsok = true, 2511 .parallel_ops = true, 2512 .small_ops = dp_vport_genl_ops, 2513 .n_small_ops = ARRAY_SIZE(dp_vport_genl_ops), 2514 .mcgrps = &ovs_dp_vport_multicast_group, 2515 .n_mcgrps = 1, 2516 .module = THIS_MODULE, 2517 }; 2518 2519 static struct genl_family * const dp_genl_families[] = { 2520 &dp_datapath_genl_family, 2521 &dp_vport_genl_family, 2522 &dp_flow_genl_family, 2523 &dp_packet_genl_family, 2524 &dp_meter_genl_family, 2525 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 2526 &dp_ct_limit_genl_family, 2527 #endif 2528 }; 2529 2530 static void dp_unregister_genl(int n_families) 2531 { 2532 int i; 2533 2534 for (i = 0; i < n_families; i++) 2535 genl_unregister_family(dp_genl_families[i]); 2536 } 2537 2538 static int __init dp_register_genl(void) 2539 { 2540 int err; 2541 int i; 2542 2543 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2544 2545 err = genl_register_family(dp_genl_families[i]); 2546 if (err) 2547 goto error; 2548 } 2549 2550 return 0; 2551 2552 error: 2553 dp_unregister_genl(i); 2554 return err; 2555 } 2556 2557 static int __net_init ovs_init_net(struct net *net) 2558 { 2559 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2560 int err; 2561 2562 INIT_LIST_HEAD(&ovs_net->dps); 2563 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2564 INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance); 2565 2566 err = ovs_ct_init(net); 2567 if (err) 2568 return err; 2569 2570 schedule_delayed_work(&ovs_net->masks_rebalance, 2571 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL)); 2572 return 0; 2573 } 2574 2575 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2576 struct list_head *head) 2577 { 2578 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2579 struct datapath *dp; 2580 2581 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2582 int i; 2583 2584 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2585 struct vport *vport; 2586 2587 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2588 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2589 continue; 2590 2591 if (dev_net(vport->dev) == dnet) 2592 list_add(&vport->detach_list, head); 2593 } 2594 } 2595 } 2596 } 2597 2598 static void __net_exit ovs_exit_net(struct net *dnet) 2599 { 2600 struct datapath *dp, *dp_next; 2601 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2602 struct vport *vport, *vport_next; 2603 struct net *net; 2604 LIST_HEAD(head); 2605 2606 ovs_lock(); 2607 2608 ovs_ct_exit(dnet); 2609 2610 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2611 __dp_destroy(dp); 2612 2613 down_read(&net_rwsem); 2614 for_each_net(net) 2615 list_vports_from_net(net, dnet, &head); 2616 up_read(&net_rwsem); 2617 2618 /* Detach all vports from given namespace. */ 2619 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2620 list_del(&vport->detach_list); 2621 ovs_dp_detach_port(vport); 2622 } 2623 2624 ovs_unlock(); 2625 2626 cancel_delayed_work_sync(&ovs_net->masks_rebalance); 2627 cancel_work_sync(&ovs_net->dp_notify_work); 2628 } 2629 2630 static struct pernet_operations ovs_net_ops = { 2631 .init = ovs_init_net, 2632 .exit = ovs_exit_net, 2633 .id = &ovs_net_id, 2634 .size = sizeof(struct ovs_net), 2635 }; 2636 2637 static int __init dp_init(void) 2638 { 2639 int err; 2640 2641 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > 2642 sizeof_field(struct sk_buff, cb)); 2643 2644 pr_info("Open vSwitch switching datapath\n"); 2645 2646 err = action_fifos_init(); 2647 if (err) 2648 goto error; 2649 2650 err = ovs_internal_dev_rtnl_link_register(); 2651 if (err) 2652 goto error_action_fifos_exit; 2653 2654 err = ovs_flow_init(); 2655 if (err) 2656 goto error_unreg_rtnl_link; 2657 2658 err = ovs_vport_init(); 2659 if (err) 2660 goto error_flow_exit; 2661 2662 err = register_pernet_device(&ovs_net_ops); 2663 if (err) 2664 goto error_vport_exit; 2665 2666 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2667 if (err) 2668 goto error_netns_exit; 2669 2670 err = ovs_netdev_init(); 2671 if (err) 2672 goto error_unreg_notifier; 2673 2674 err = dp_register_genl(); 2675 if (err < 0) 2676 goto error_unreg_netdev; 2677 2678 return 0; 2679 2680 error_unreg_netdev: 2681 ovs_netdev_exit(); 2682 error_unreg_notifier: 2683 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2684 error_netns_exit: 2685 unregister_pernet_device(&ovs_net_ops); 2686 error_vport_exit: 2687 ovs_vport_exit(); 2688 error_flow_exit: 2689 ovs_flow_exit(); 2690 error_unreg_rtnl_link: 2691 ovs_internal_dev_rtnl_link_unregister(); 2692 error_action_fifos_exit: 2693 action_fifos_exit(); 2694 error: 2695 return err; 2696 } 2697 2698 static void dp_cleanup(void) 2699 { 2700 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2701 ovs_netdev_exit(); 2702 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2703 unregister_pernet_device(&ovs_net_ops); 2704 rcu_barrier(); 2705 ovs_vport_exit(); 2706 ovs_flow_exit(); 2707 ovs_internal_dev_rtnl_link_unregister(); 2708 action_fifos_exit(); 2709 } 2710 2711 module_init(dp_init); 2712 module_exit(dp_cleanup); 2713 2714 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2715 MODULE_LICENSE("GPL"); 2716 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY); 2717 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY); 2718 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY); 2719 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY); 2720 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY); 2721 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY); 2722