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(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 = ovs_dp_get_upcall_portid(dp, smp_processor_id()); 248 else 249 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 250 251 upcall.mru = OVS_CB(skb)->mru; 252 error = ovs_dp_upcall(dp, skb, key, &upcall, 0); 253 if (unlikely(error)) 254 kfree_skb(skb); 255 else 256 consume_skb(skb); 257 stats_counter = &stats->n_missed; 258 goto out; 259 } 260 261 ovs_flow_stats_update(flow, key->tp.flags, skb); 262 sf_acts = rcu_dereference(flow->sf_acts); 263 error = ovs_execute_actions(dp, skb, sf_acts, key); 264 if (unlikely(error)) 265 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n", 266 ovs_dp_name(dp), error); 267 268 stats_counter = &stats->n_hit; 269 270 out: 271 /* Update datapath statistics. */ 272 u64_stats_update_begin(&stats->syncp); 273 (*stats_counter)++; 274 stats->n_mask_hit += n_mask_hit; 275 stats->n_cache_hit += n_cache_hit; 276 u64_stats_update_end(&stats->syncp); 277 } 278 279 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 280 const struct sw_flow_key *key, 281 const struct dp_upcall_info *upcall_info, 282 uint32_t cutlen) 283 { 284 struct dp_stats_percpu *stats; 285 int err; 286 287 if (trace_ovs_dp_upcall_enabled()) 288 trace_ovs_dp_upcall(dp, skb, key, upcall_info); 289 290 if (upcall_info->portid == 0) { 291 err = -ENOTCONN; 292 goto err; 293 } 294 295 if (!skb_is_gso(skb)) 296 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 297 else 298 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen); 299 if (err) 300 goto err; 301 302 return 0; 303 304 err: 305 stats = this_cpu_ptr(dp->stats_percpu); 306 307 u64_stats_update_begin(&stats->syncp); 308 stats->n_lost++; 309 u64_stats_update_end(&stats->syncp); 310 311 return err; 312 } 313 314 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 315 const struct sw_flow_key *key, 316 const struct dp_upcall_info *upcall_info, 317 uint32_t cutlen) 318 { 319 unsigned int gso_type = skb_shinfo(skb)->gso_type; 320 struct sw_flow_key later_key; 321 struct sk_buff *segs, *nskb; 322 int err; 323 324 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET); 325 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 326 if (IS_ERR(segs)) 327 return PTR_ERR(segs); 328 if (segs == NULL) 329 return -EINVAL; 330 331 if (gso_type & SKB_GSO_UDP) { 332 /* The initial flow key extracted by ovs_flow_key_extract() 333 * in this case is for a first fragment, so we need to 334 * properly mark later fragments. 335 */ 336 later_key = *key; 337 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 338 } 339 340 /* Queue all of the segments. */ 341 skb_list_walk_safe(segs, skb, nskb) { 342 if (gso_type & SKB_GSO_UDP && skb != segs) 343 key = &later_key; 344 345 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 346 if (err) 347 break; 348 349 } 350 351 /* Free all of the segments. */ 352 skb_list_walk_safe(segs, skb, nskb) { 353 if (err) 354 kfree_skb(skb); 355 else 356 consume_skb(skb); 357 } 358 return err; 359 } 360 361 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, 362 unsigned int hdrlen, int actions_attrlen) 363 { 364 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 365 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 366 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */ 367 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */ 368 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */ 369 370 /* OVS_PACKET_ATTR_USERDATA */ 371 if (upcall_info->userdata) 372 size += NLA_ALIGN(upcall_info->userdata->nla_len); 373 374 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ 375 if (upcall_info->egress_tun_info) 376 size += nla_total_size(ovs_tun_key_attr_size()); 377 378 /* OVS_PACKET_ATTR_ACTIONS */ 379 if (upcall_info->actions_len) 380 size += nla_total_size(actions_attrlen); 381 382 /* OVS_PACKET_ATTR_MRU */ 383 if (upcall_info->mru) 384 size += nla_total_size(sizeof(upcall_info->mru)); 385 386 return size; 387 } 388 389 static void pad_packet(struct datapath *dp, struct sk_buff *skb) 390 { 391 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 392 size_t plen = NLA_ALIGN(skb->len) - skb->len; 393 394 if (plen > 0) 395 skb_put_zero(skb, plen); 396 } 397 } 398 399 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 400 const struct sw_flow_key *key, 401 const struct dp_upcall_info *upcall_info, 402 uint32_t cutlen) 403 { 404 struct ovs_header *upcall; 405 struct sk_buff *nskb = NULL; 406 struct sk_buff *user_skb = NULL; /* to be queued to userspace */ 407 struct nlattr *nla; 408 size_t len; 409 unsigned int hlen; 410 int err, dp_ifindex; 411 u64 hash; 412 413 dp_ifindex = get_dpifindex(dp); 414 if (!dp_ifindex) 415 return -ENODEV; 416 417 if (skb_vlan_tag_present(skb)) { 418 nskb = skb_clone(skb, GFP_ATOMIC); 419 if (!nskb) 420 return -ENOMEM; 421 422 nskb = __vlan_hwaccel_push_inside(nskb); 423 if (!nskb) 424 return -ENOMEM; 425 426 skb = nskb; 427 } 428 429 if (nla_attr_size(skb->len) > USHRT_MAX) { 430 err = -EFBIG; 431 goto out; 432 } 433 434 /* Complete checksum if needed */ 435 if (skb->ip_summed == CHECKSUM_PARTIAL && 436 (err = skb_csum_hwoffload_help(skb, 0))) 437 goto out; 438 439 /* Older versions of OVS user space enforce alignment of the last 440 * Netlink attribute to NLA_ALIGNTO which would require extensive 441 * padding logic. Only perform zerocopy if padding is not required. 442 */ 443 if (dp->user_features & OVS_DP_F_UNALIGNED) 444 hlen = skb_zerocopy_headlen(skb); 445 else 446 hlen = skb->len; 447 448 len = upcall_msg_size(upcall_info, hlen - cutlen, 449 OVS_CB(skb)->acts_origlen); 450 user_skb = genlmsg_new(len, GFP_ATOMIC); 451 if (!user_skb) { 452 err = -ENOMEM; 453 goto out; 454 } 455 456 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 457 0, upcall_info->cmd); 458 if (!upcall) { 459 err = -EINVAL; 460 goto out; 461 } 462 upcall->dp_ifindex = dp_ifindex; 463 464 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); 465 if (err) 466 goto out; 467 468 if (upcall_info->userdata) 469 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 470 nla_len(upcall_info->userdata), 471 nla_data(upcall_info->userdata)); 472 473 if (upcall_info->egress_tun_info) { 474 nla = nla_nest_start_noflag(user_skb, 475 OVS_PACKET_ATTR_EGRESS_TUN_KEY); 476 if (!nla) { 477 err = -EMSGSIZE; 478 goto out; 479 } 480 err = ovs_nla_put_tunnel_info(user_skb, 481 upcall_info->egress_tun_info); 482 if (err) 483 goto out; 484 485 nla_nest_end(user_skb, nla); 486 } 487 488 if (upcall_info->actions_len) { 489 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS); 490 if (!nla) { 491 err = -EMSGSIZE; 492 goto out; 493 } 494 err = ovs_nla_put_actions(upcall_info->actions, 495 upcall_info->actions_len, 496 user_skb); 497 if (!err) 498 nla_nest_end(user_skb, nla); 499 else 500 nla_nest_cancel(user_skb, nla); 501 } 502 503 /* Add OVS_PACKET_ATTR_MRU */ 504 if (upcall_info->mru && 505 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) { 506 err = -ENOBUFS; 507 goto out; 508 } 509 510 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */ 511 if (cutlen > 0 && 512 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) { 513 err = -ENOBUFS; 514 goto out; 515 } 516 517 /* Add OVS_PACKET_ATTR_HASH */ 518 hash = skb_get_hash_raw(skb); 519 if (skb->sw_hash) 520 hash |= OVS_PACKET_HASH_SW_BIT; 521 522 if (skb->l4_hash) 523 hash |= OVS_PACKET_HASH_L4_BIT; 524 525 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) { 526 err = -ENOBUFS; 527 goto out; 528 } 529 530 /* Only reserve room for attribute header, packet data is added 531 * in skb_zerocopy() */ 532 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 533 err = -ENOBUFS; 534 goto out; 535 } 536 nla->nla_len = nla_attr_size(skb->len - cutlen); 537 538 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen); 539 if (err) 540 goto out; 541 542 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 543 pad_packet(dp, user_skb); 544 545 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 546 547 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 548 user_skb = NULL; 549 out: 550 if (err) 551 skb_tx_error(skb); 552 kfree_skb(user_skb); 553 kfree_skb(nskb); 554 return err; 555 } 556 557 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 558 { 559 struct ovs_header *ovs_header = info->userhdr; 560 struct net *net = sock_net(skb->sk); 561 struct nlattr **a = info->attrs; 562 struct sw_flow_actions *acts; 563 struct sk_buff *packet; 564 struct sw_flow *flow; 565 struct sw_flow_actions *sf_acts; 566 struct datapath *dp; 567 struct vport *input_vport; 568 u16 mru = 0; 569 u64 hash; 570 int len; 571 int err; 572 bool log = !a[OVS_PACKET_ATTR_PROBE]; 573 574 err = -EINVAL; 575 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 576 !a[OVS_PACKET_ATTR_ACTIONS]) 577 goto err; 578 579 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 580 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 581 err = -ENOMEM; 582 if (!packet) 583 goto err; 584 skb_reserve(packet, NET_IP_ALIGN); 585 586 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 587 588 /* Set packet's mru */ 589 if (a[OVS_PACKET_ATTR_MRU]) { 590 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]); 591 packet->ignore_df = 1; 592 } 593 OVS_CB(packet)->mru = mru; 594 595 if (a[OVS_PACKET_ATTR_HASH]) { 596 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]); 597 598 __skb_set_hash(packet, hash & 0xFFFFFFFFULL, 599 !!(hash & OVS_PACKET_HASH_SW_BIT), 600 !!(hash & OVS_PACKET_HASH_L4_BIT)); 601 } 602 603 /* Build an sw_flow for sending this packet. */ 604 flow = ovs_flow_alloc(); 605 err = PTR_ERR(flow); 606 if (IS_ERR(flow)) 607 goto err_kfree_skb; 608 609 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY], 610 packet, &flow->key, log); 611 if (err) 612 goto err_flow_free; 613 614 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS], 615 &flow->key, &acts, log); 616 if (err) 617 goto err_flow_free; 618 619 rcu_assign_pointer(flow->sf_acts, acts); 620 packet->priority = flow->key.phy.priority; 621 packet->mark = flow->key.phy.skb_mark; 622 623 rcu_read_lock(); 624 dp = get_dp_rcu(net, ovs_header->dp_ifindex); 625 err = -ENODEV; 626 if (!dp) 627 goto err_unlock; 628 629 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 630 if (!input_vport) 631 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 632 633 if (!input_vport) 634 goto err_unlock; 635 636 packet->dev = input_vport->dev; 637 OVS_CB(packet)->input_vport = input_vport; 638 sf_acts = rcu_dereference(flow->sf_acts); 639 640 local_bh_disable(); 641 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); 642 local_bh_enable(); 643 rcu_read_unlock(); 644 645 ovs_flow_free(flow, false); 646 return err; 647 648 err_unlock: 649 rcu_read_unlock(); 650 err_flow_free: 651 ovs_flow_free(flow, false); 652 err_kfree_skb: 653 kfree_skb(packet); 654 err: 655 return err; 656 } 657 658 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 659 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 660 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 661 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 662 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, 663 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, 664 [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 }, 665 }; 666 667 static const struct genl_small_ops dp_packet_genl_ops[] = { 668 { .cmd = OVS_PACKET_CMD_EXECUTE, 669 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 670 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 671 .doit = ovs_packet_cmd_execute 672 } 673 }; 674 675 static struct genl_family dp_packet_genl_family __ro_after_init = { 676 .hdrsize = sizeof(struct ovs_header), 677 .name = OVS_PACKET_FAMILY, 678 .version = OVS_PACKET_VERSION, 679 .maxattr = OVS_PACKET_ATTR_MAX, 680 .policy = packet_policy, 681 .netnsok = true, 682 .parallel_ops = true, 683 .small_ops = dp_packet_genl_ops, 684 .n_small_ops = ARRAY_SIZE(dp_packet_genl_ops), 685 .module = THIS_MODULE, 686 }; 687 688 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 689 struct ovs_dp_megaflow_stats *mega_stats) 690 { 691 int i; 692 693 memset(mega_stats, 0, sizeof(*mega_stats)); 694 695 stats->n_flows = ovs_flow_tbl_count(&dp->table); 696 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 697 698 stats->n_hit = stats->n_missed = stats->n_lost = 0; 699 700 for_each_possible_cpu(i) { 701 const struct dp_stats_percpu *percpu_stats; 702 struct dp_stats_percpu local_stats; 703 unsigned int start; 704 705 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 706 707 do { 708 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 709 local_stats = *percpu_stats; 710 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 711 712 stats->n_hit += local_stats.n_hit; 713 stats->n_missed += local_stats.n_missed; 714 stats->n_lost += local_stats.n_lost; 715 mega_stats->n_mask_hit += local_stats.n_mask_hit; 716 mega_stats->n_cache_hit += local_stats.n_cache_hit; 717 } 718 } 719 720 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) 721 { 722 return ovs_identifier_is_ufid(sfid) && 723 !(ufid_flags & OVS_UFID_F_OMIT_KEY); 724 } 725 726 static bool should_fill_mask(uint32_t ufid_flags) 727 { 728 return !(ufid_flags & OVS_UFID_F_OMIT_MASK); 729 } 730 731 static bool should_fill_actions(uint32_t ufid_flags) 732 { 733 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); 734 } 735 736 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, 737 const struct sw_flow_id *sfid, 738 uint32_t ufid_flags) 739 { 740 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); 741 742 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback 743 * see ovs_nla_put_identifier() 744 */ 745 if (sfid && ovs_identifier_is_ufid(sfid)) 746 len += nla_total_size(sfid->ufid_len); 747 else 748 len += nla_total_size(ovs_key_attr_size()); 749 750 /* OVS_FLOW_ATTR_KEY */ 751 if (!sfid || should_fill_key(sfid, ufid_flags)) 752 len += nla_total_size(ovs_key_attr_size()); 753 754 /* OVS_FLOW_ATTR_MASK */ 755 if (should_fill_mask(ufid_flags)) 756 len += nla_total_size(ovs_key_attr_size()); 757 758 /* OVS_FLOW_ATTR_ACTIONS */ 759 if (should_fill_actions(ufid_flags)) 760 len += nla_total_size(acts->orig_len); 761 762 return len 763 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 764 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 765 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */ 766 } 767 768 /* Called with ovs_mutex or RCU read lock. */ 769 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 770 struct sk_buff *skb) 771 { 772 struct ovs_flow_stats stats; 773 __be16 tcp_flags; 774 unsigned long used; 775 776 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 777 778 if (used && 779 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used), 780 OVS_FLOW_ATTR_PAD)) 781 return -EMSGSIZE; 782 783 if (stats.n_packets && 784 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS, 785 sizeof(struct ovs_flow_stats), &stats, 786 OVS_FLOW_ATTR_PAD)) 787 return -EMSGSIZE; 788 789 if ((u8)ntohs(tcp_flags) && 790 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 791 return -EMSGSIZE; 792 793 return 0; 794 } 795 796 /* Called with ovs_mutex or RCU read lock. */ 797 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 798 struct sk_buff *skb, int skb_orig_len) 799 { 800 struct nlattr *start; 801 int err; 802 803 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 804 * this is the first flow to be dumped into 'skb'. This is unusual for 805 * Netlink but individual action lists can be longer than 806 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 807 * The userspace caller can always fetch the actions separately if it 808 * really wants them. (Most userspace callers in fact don't care.) 809 * 810 * This can only fail for dump operations because the skb is always 811 * properly sized for single flows. 812 */ 813 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS); 814 if (start) { 815 const struct sw_flow_actions *sf_acts; 816 817 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 818 err = ovs_nla_put_actions(sf_acts->actions, 819 sf_acts->actions_len, skb); 820 821 if (!err) 822 nla_nest_end(skb, start); 823 else { 824 if (skb_orig_len) 825 return err; 826 827 nla_nest_cancel(skb, start); 828 } 829 } else if (skb_orig_len) { 830 return -EMSGSIZE; 831 } 832 833 return 0; 834 } 835 836 /* Called with ovs_mutex or RCU read lock. */ 837 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 838 struct sk_buff *skb, u32 portid, 839 u32 seq, u32 flags, u8 cmd, u32 ufid_flags) 840 { 841 const int skb_orig_len = skb->len; 842 struct ovs_header *ovs_header; 843 int err; 844 845 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 846 flags, cmd); 847 if (!ovs_header) 848 return -EMSGSIZE; 849 850 ovs_header->dp_ifindex = dp_ifindex; 851 852 err = ovs_nla_put_identifier(flow, skb); 853 if (err) 854 goto error; 855 856 if (should_fill_key(&flow->id, ufid_flags)) { 857 err = ovs_nla_put_masked_key(flow, skb); 858 if (err) 859 goto error; 860 } 861 862 if (should_fill_mask(ufid_flags)) { 863 err = ovs_nla_put_mask(flow, skb); 864 if (err) 865 goto error; 866 } 867 868 err = ovs_flow_cmd_fill_stats(flow, skb); 869 if (err) 870 goto error; 871 872 if (should_fill_actions(ufid_flags)) { 873 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 874 if (err) 875 goto error; 876 } 877 878 genlmsg_end(skb, ovs_header); 879 return 0; 880 881 error: 882 genlmsg_cancel(skb, ovs_header); 883 return err; 884 } 885 886 /* May not be called with RCU read lock. */ 887 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 888 const struct sw_flow_id *sfid, 889 struct genl_info *info, 890 bool always, 891 uint32_t ufid_flags) 892 { 893 struct sk_buff *skb; 894 size_t len; 895 896 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 897 return NULL; 898 899 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); 900 skb = genlmsg_new(len, GFP_KERNEL); 901 if (!skb) 902 return ERR_PTR(-ENOMEM); 903 904 return skb; 905 } 906 907 /* Called with ovs_mutex. */ 908 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 909 int dp_ifindex, 910 struct genl_info *info, u8 cmd, 911 bool always, u32 ufid_flags) 912 { 913 struct sk_buff *skb; 914 int retval; 915 916 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), 917 &flow->id, info, always, ufid_flags); 918 if (IS_ERR_OR_NULL(skb)) 919 return skb; 920 921 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 922 info->snd_portid, info->snd_seq, 0, 923 cmd, ufid_flags); 924 if (WARN_ON_ONCE(retval < 0)) { 925 kfree_skb(skb); 926 skb = ERR_PTR(retval); 927 } 928 return skb; 929 } 930 931 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 932 { 933 struct net *net = sock_net(skb->sk); 934 struct nlattr **a = info->attrs; 935 struct ovs_header *ovs_header = info->userhdr; 936 struct sw_flow *flow = NULL, *new_flow; 937 struct sw_flow_mask mask; 938 struct sk_buff *reply; 939 struct datapath *dp; 940 struct sw_flow_actions *acts; 941 struct sw_flow_match match; 942 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 943 int error; 944 bool log = !a[OVS_FLOW_ATTR_PROBE]; 945 946 /* Must have key and actions. */ 947 error = -EINVAL; 948 if (!a[OVS_FLOW_ATTR_KEY]) { 949 OVS_NLERR(log, "Flow key attr not present in new flow."); 950 goto error; 951 } 952 if (!a[OVS_FLOW_ATTR_ACTIONS]) { 953 OVS_NLERR(log, "Flow actions attr not present in new flow."); 954 goto error; 955 } 956 957 /* Most of the time we need to allocate a new flow, do it before 958 * locking. 959 */ 960 new_flow = ovs_flow_alloc(); 961 if (IS_ERR(new_flow)) { 962 error = PTR_ERR(new_flow); 963 goto error; 964 } 965 966 /* Extract key. */ 967 ovs_match_init(&match, &new_flow->key, false, &mask); 968 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 969 a[OVS_FLOW_ATTR_MASK], log); 970 if (error) 971 goto err_kfree_flow; 972 973 /* Extract flow identifier. */ 974 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID], 975 &new_flow->key, log); 976 if (error) 977 goto err_kfree_flow; 978 979 /* unmasked key is needed to match when ufid is not used. */ 980 if (ovs_identifier_is_key(&new_flow->id)) 981 match.key = new_flow->id.unmasked_key; 982 983 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask); 984 985 /* Validate actions. */ 986 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS], 987 &new_flow->key, &acts, log); 988 if (error) { 989 OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); 990 goto err_kfree_flow; 991 } 992 993 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false, 994 ufid_flags); 995 if (IS_ERR(reply)) { 996 error = PTR_ERR(reply); 997 goto err_kfree_acts; 998 } 999 1000 ovs_lock(); 1001 dp = get_dp(net, ovs_header->dp_ifindex); 1002 if (unlikely(!dp)) { 1003 error = -ENODEV; 1004 goto err_unlock_ovs; 1005 } 1006 1007 /* Check if this is a duplicate flow */ 1008 if (ovs_identifier_is_ufid(&new_flow->id)) 1009 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id); 1010 if (!flow) 1011 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key); 1012 if (likely(!flow)) { 1013 rcu_assign_pointer(new_flow->sf_acts, acts); 1014 1015 /* Put flow in bucket. */ 1016 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 1017 if (unlikely(error)) { 1018 acts = NULL; 1019 goto err_unlock_ovs; 1020 } 1021 1022 if (unlikely(reply)) { 1023 error = ovs_flow_cmd_fill_info(new_flow, 1024 ovs_header->dp_ifindex, 1025 reply, info->snd_portid, 1026 info->snd_seq, 0, 1027 OVS_FLOW_CMD_NEW, 1028 ufid_flags); 1029 BUG_ON(error < 0); 1030 } 1031 ovs_unlock(); 1032 } else { 1033 struct sw_flow_actions *old_acts; 1034 1035 /* Bail out if we're not allowed to modify an existing flow. 1036 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 1037 * because Generic Netlink treats the latter as a dump 1038 * request. We also accept NLM_F_EXCL in case that bug ever 1039 * gets fixed. 1040 */ 1041 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 1042 | NLM_F_EXCL))) { 1043 error = -EEXIST; 1044 goto err_unlock_ovs; 1045 } 1046 /* The flow identifier has to be the same for flow updates. 1047 * Look for any overlapping flow. 1048 */ 1049 if (unlikely(!ovs_flow_cmp(flow, &match))) { 1050 if (ovs_identifier_is_key(&flow->id)) 1051 flow = ovs_flow_tbl_lookup_exact(&dp->table, 1052 &match); 1053 else /* UFID matches but key is different */ 1054 flow = NULL; 1055 if (!flow) { 1056 error = -ENOENT; 1057 goto err_unlock_ovs; 1058 } 1059 } 1060 /* Update actions. */ 1061 old_acts = ovsl_dereference(flow->sf_acts); 1062 rcu_assign_pointer(flow->sf_acts, acts); 1063 1064 if (unlikely(reply)) { 1065 error = ovs_flow_cmd_fill_info(flow, 1066 ovs_header->dp_ifindex, 1067 reply, info->snd_portid, 1068 info->snd_seq, 0, 1069 OVS_FLOW_CMD_NEW, 1070 ufid_flags); 1071 BUG_ON(error < 0); 1072 } 1073 ovs_unlock(); 1074 1075 ovs_nla_free_flow_actions_rcu(old_acts); 1076 ovs_flow_free(new_flow, false); 1077 } 1078 1079 if (reply) 1080 ovs_notify(&dp_flow_genl_family, reply, info); 1081 return 0; 1082 1083 err_unlock_ovs: 1084 ovs_unlock(); 1085 kfree_skb(reply); 1086 err_kfree_acts: 1087 ovs_nla_free_flow_actions(acts); 1088 err_kfree_flow: 1089 ovs_flow_free(new_flow, false); 1090 error: 1091 return error; 1092 } 1093 1094 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ 1095 static noinline_for_stack 1096 struct sw_flow_actions *get_flow_actions(struct net *net, 1097 const struct nlattr *a, 1098 const struct sw_flow_key *key, 1099 const struct sw_flow_mask *mask, 1100 bool log) 1101 { 1102 struct sw_flow_actions *acts; 1103 struct sw_flow_key masked_key; 1104 int error; 1105 1106 ovs_flow_mask_key(&masked_key, key, true, mask); 1107 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log); 1108 if (error) { 1109 OVS_NLERR(log, 1110 "Actions may not be safe on all matching packets"); 1111 return ERR_PTR(error); 1112 } 1113 1114 return acts; 1115 } 1116 1117 /* Factor out match-init and action-copy to avoid 1118 * "Wframe-larger-than=1024" warning. Because mask is only 1119 * used to get actions, we new a function to save some 1120 * stack space. 1121 * 1122 * If there are not key and action attrs, we return 0 1123 * directly. In the case, the caller will also not use the 1124 * match as before. If there is action attr, we try to get 1125 * actions and save them to *acts. Before returning from 1126 * the function, we reset the match->mask pointer. Because 1127 * we should not to return match object with dangling reference 1128 * to mask. 1129 * */ 1130 static noinline_for_stack int 1131 ovs_nla_init_match_and_action(struct net *net, 1132 struct sw_flow_match *match, 1133 struct sw_flow_key *key, 1134 struct nlattr **a, 1135 struct sw_flow_actions **acts, 1136 bool log) 1137 { 1138 struct sw_flow_mask mask; 1139 int error = 0; 1140 1141 if (a[OVS_FLOW_ATTR_KEY]) { 1142 ovs_match_init(match, key, true, &mask); 1143 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY], 1144 a[OVS_FLOW_ATTR_MASK], log); 1145 if (error) 1146 goto error; 1147 } 1148 1149 if (a[OVS_FLOW_ATTR_ACTIONS]) { 1150 if (!a[OVS_FLOW_ATTR_KEY]) { 1151 OVS_NLERR(log, 1152 "Flow key attribute not present in set flow."); 1153 error = -EINVAL; 1154 goto error; 1155 } 1156 1157 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key, 1158 &mask, log); 1159 if (IS_ERR(*acts)) { 1160 error = PTR_ERR(*acts); 1161 goto error; 1162 } 1163 } 1164 1165 /* On success, error is 0. */ 1166 error: 1167 match->mask = NULL; 1168 return error; 1169 } 1170 1171 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 1172 { 1173 struct net *net = sock_net(skb->sk); 1174 struct nlattr **a = info->attrs; 1175 struct ovs_header *ovs_header = info->userhdr; 1176 struct sw_flow_key key; 1177 struct sw_flow *flow; 1178 struct sk_buff *reply = NULL; 1179 struct datapath *dp; 1180 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 1181 struct sw_flow_match match; 1182 struct sw_flow_id sfid; 1183 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1184 int error = 0; 1185 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1186 bool ufid_present; 1187 1188 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); 1189 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) { 1190 OVS_NLERR(log, 1191 "Flow set message rejected, Key attribute missing."); 1192 return -EINVAL; 1193 } 1194 1195 error = ovs_nla_init_match_and_action(net, &match, &key, a, 1196 &acts, log); 1197 if (error) 1198 goto error; 1199 1200 if (acts) { 1201 /* Can allocate before locking if have acts. */ 1202 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false, 1203 ufid_flags); 1204 if (IS_ERR(reply)) { 1205 error = PTR_ERR(reply); 1206 goto err_kfree_acts; 1207 } 1208 } 1209 1210 ovs_lock(); 1211 dp = get_dp(net, ovs_header->dp_ifindex); 1212 if (unlikely(!dp)) { 1213 error = -ENODEV; 1214 goto err_unlock_ovs; 1215 } 1216 /* Check that the flow exists. */ 1217 if (ufid_present) 1218 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid); 1219 else 1220 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1221 if (unlikely(!flow)) { 1222 error = -ENOENT; 1223 goto err_unlock_ovs; 1224 } 1225 1226 /* Update actions, if present. */ 1227 if (likely(acts)) { 1228 old_acts = ovsl_dereference(flow->sf_acts); 1229 rcu_assign_pointer(flow->sf_acts, acts); 1230 1231 if (unlikely(reply)) { 1232 error = ovs_flow_cmd_fill_info(flow, 1233 ovs_header->dp_ifindex, 1234 reply, info->snd_portid, 1235 info->snd_seq, 0, 1236 OVS_FLOW_CMD_SET, 1237 ufid_flags); 1238 BUG_ON(error < 0); 1239 } 1240 } else { 1241 /* Could not alloc without acts before locking. */ 1242 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1243 info, OVS_FLOW_CMD_SET, false, 1244 ufid_flags); 1245 1246 if (IS_ERR(reply)) { 1247 error = PTR_ERR(reply); 1248 goto err_unlock_ovs; 1249 } 1250 } 1251 1252 /* Clear stats. */ 1253 if (a[OVS_FLOW_ATTR_CLEAR]) 1254 ovs_flow_stats_clear(flow); 1255 ovs_unlock(); 1256 1257 if (reply) 1258 ovs_notify(&dp_flow_genl_family, reply, info); 1259 if (old_acts) 1260 ovs_nla_free_flow_actions_rcu(old_acts); 1261 1262 return 0; 1263 1264 err_unlock_ovs: 1265 ovs_unlock(); 1266 kfree_skb(reply); 1267 err_kfree_acts: 1268 ovs_nla_free_flow_actions(acts); 1269 error: 1270 return error; 1271 } 1272 1273 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1274 { 1275 struct nlattr **a = info->attrs; 1276 struct ovs_header *ovs_header = info->userhdr; 1277 struct net *net = sock_net(skb->sk); 1278 struct sw_flow_key key; 1279 struct sk_buff *reply; 1280 struct sw_flow *flow; 1281 struct datapath *dp; 1282 struct sw_flow_match match; 1283 struct sw_flow_id ufid; 1284 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1285 int err = 0; 1286 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1287 bool ufid_present; 1288 1289 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1290 if (a[OVS_FLOW_ATTR_KEY]) { 1291 ovs_match_init(&match, &key, true, NULL); 1292 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL, 1293 log); 1294 } else if (!ufid_present) { 1295 OVS_NLERR(log, 1296 "Flow get message rejected, Key attribute missing."); 1297 err = -EINVAL; 1298 } 1299 if (err) 1300 return err; 1301 1302 ovs_lock(); 1303 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1304 if (!dp) { 1305 err = -ENODEV; 1306 goto unlock; 1307 } 1308 1309 if (ufid_present) 1310 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1311 else 1312 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1313 if (!flow) { 1314 err = -ENOENT; 1315 goto unlock; 1316 } 1317 1318 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1319 OVS_FLOW_CMD_GET, true, ufid_flags); 1320 if (IS_ERR(reply)) { 1321 err = PTR_ERR(reply); 1322 goto unlock; 1323 } 1324 1325 ovs_unlock(); 1326 return genlmsg_reply(reply, info); 1327 unlock: 1328 ovs_unlock(); 1329 return err; 1330 } 1331 1332 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1333 { 1334 struct nlattr **a = info->attrs; 1335 struct ovs_header *ovs_header = info->userhdr; 1336 struct net *net = sock_net(skb->sk); 1337 struct sw_flow_key key; 1338 struct sk_buff *reply; 1339 struct sw_flow *flow = NULL; 1340 struct datapath *dp; 1341 struct sw_flow_match match; 1342 struct sw_flow_id ufid; 1343 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1344 int err; 1345 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1346 bool ufid_present; 1347 1348 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1349 if (a[OVS_FLOW_ATTR_KEY]) { 1350 ovs_match_init(&match, &key, true, NULL); 1351 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1352 NULL, log); 1353 if (unlikely(err)) 1354 return err; 1355 } 1356 1357 ovs_lock(); 1358 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1359 if (unlikely(!dp)) { 1360 err = -ENODEV; 1361 goto unlock; 1362 } 1363 1364 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) { 1365 err = ovs_flow_tbl_flush(&dp->table); 1366 goto unlock; 1367 } 1368 1369 if (ufid_present) 1370 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1371 else 1372 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1373 if (unlikely(!flow)) { 1374 err = -ENOENT; 1375 goto unlock; 1376 } 1377 1378 ovs_flow_tbl_remove(&dp->table, flow); 1379 ovs_unlock(); 1380 1381 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1382 &flow->id, info, false, ufid_flags); 1383 if (likely(reply)) { 1384 if (!IS_ERR(reply)) { 1385 rcu_read_lock(); /*To keep RCU checker happy. */ 1386 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1387 reply, info->snd_portid, 1388 info->snd_seq, 0, 1389 OVS_FLOW_CMD_DEL, 1390 ufid_flags); 1391 rcu_read_unlock(); 1392 if (WARN_ON_ONCE(err < 0)) { 1393 kfree_skb(reply); 1394 goto out_free; 1395 } 1396 1397 ovs_notify(&dp_flow_genl_family, reply, info); 1398 } else { 1399 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, 1400 PTR_ERR(reply)); 1401 } 1402 } 1403 1404 out_free: 1405 ovs_flow_free(flow, true); 1406 return 0; 1407 unlock: 1408 ovs_unlock(); 1409 return err; 1410 } 1411 1412 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1413 { 1414 struct nlattr *a[__OVS_FLOW_ATTR_MAX]; 1415 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1416 struct table_instance *ti; 1417 struct datapath *dp; 1418 u32 ufid_flags; 1419 int err; 1420 1421 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a, 1422 OVS_FLOW_ATTR_MAX, flow_policy, NULL); 1423 if (err) 1424 return err; 1425 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1426 1427 rcu_read_lock(); 1428 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1429 if (!dp) { 1430 rcu_read_unlock(); 1431 return -ENODEV; 1432 } 1433 1434 ti = rcu_dereference(dp->table.ti); 1435 for (;;) { 1436 struct sw_flow *flow; 1437 u32 bucket, obj; 1438 1439 bucket = cb->args[0]; 1440 obj = cb->args[1]; 1441 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1442 if (!flow) 1443 break; 1444 1445 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1446 NETLINK_CB(cb->skb).portid, 1447 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1448 OVS_FLOW_CMD_GET, ufid_flags) < 0) 1449 break; 1450 1451 cb->args[0] = bucket; 1452 cb->args[1] = obj; 1453 } 1454 rcu_read_unlock(); 1455 return skb->len; 1456 } 1457 1458 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1459 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1460 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1461 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1462 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1463 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1464 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, 1465 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, 1466 }; 1467 1468 static const struct genl_small_ops dp_flow_genl_ops[] = { 1469 { .cmd = OVS_FLOW_CMD_NEW, 1470 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1471 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1472 .doit = ovs_flow_cmd_new 1473 }, 1474 { .cmd = OVS_FLOW_CMD_DEL, 1475 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1476 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1477 .doit = ovs_flow_cmd_del 1478 }, 1479 { .cmd = OVS_FLOW_CMD_GET, 1480 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1481 .flags = 0, /* OK for unprivileged users. */ 1482 .doit = ovs_flow_cmd_get, 1483 .dumpit = ovs_flow_cmd_dump 1484 }, 1485 { .cmd = OVS_FLOW_CMD_SET, 1486 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1487 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1488 .doit = ovs_flow_cmd_set, 1489 }, 1490 }; 1491 1492 static struct genl_family dp_flow_genl_family __ro_after_init = { 1493 .hdrsize = sizeof(struct ovs_header), 1494 .name = OVS_FLOW_FAMILY, 1495 .version = OVS_FLOW_VERSION, 1496 .maxattr = OVS_FLOW_ATTR_MAX, 1497 .policy = flow_policy, 1498 .netnsok = true, 1499 .parallel_ops = true, 1500 .small_ops = dp_flow_genl_ops, 1501 .n_small_ops = ARRAY_SIZE(dp_flow_genl_ops), 1502 .mcgrps = &ovs_dp_flow_multicast_group, 1503 .n_mcgrps = 1, 1504 .module = THIS_MODULE, 1505 }; 1506 1507 static size_t ovs_dp_cmd_msg_size(void) 1508 { 1509 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1510 1511 msgsize += nla_total_size(IFNAMSIZ); 1512 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats)); 1513 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats)); 1514 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1515 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */ 1516 1517 return msgsize; 1518 } 1519 1520 /* Called with ovs_mutex. */ 1521 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1522 u32 portid, u32 seq, u32 flags, u8 cmd) 1523 { 1524 struct ovs_header *ovs_header; 1525 struct ovs_dp_stats dp_stats; 1526 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1527 int err; 1528 1529 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1530 flags, cmd); 1531 if (!ovs_header) 1532 goto error; 1533 1534 ovs_header->dp_ifindex = get_dpifindex(dp); 1535 1536 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1537 if (err) 1538 goto nla_put_failure; 1539 1540 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1541 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1542 &dp_stats, OVS_DP_ATTR_PAD)) 1543 goto nla_put_failure; 1544 1545 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1546 sizeof(struct ovs_dp_megaflow_stats), 1547 &dp_megaflow_stats, OVS_DP_ATTR_PAD)) 1548 goto nla_put_failure; 1549 1550 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1551 goto nla_put_failure; 1552 1553 if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE, 1554 ovs_flow_tbl_masks_cache_size(&dp->table))) 1555 goto nla_put_failure; 1556 1557 genlmsg_end(skb, ovs_header); 1558 return 0; 1559 1560 nla_put_failure: 1561 genlmsg_cancel(skb, ovs_header); 1562 error: 1563 return -EMSGSIZE; 1564 } 1565 1566 static struct sk_buff *ovs_dp_cmd_alloc_info(void) 1567 { 1568 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL); 1569 } 1570 1571 /* Called with rcu_read_lock or ovs_mutex. */ 1572 static struct datapath *lookup_datapath(struct net *net, 1573 const struct ovs_header *ovs_header, 1574 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1575 { 1576 struct datapath *dp; 1577 1578 if (!a[OVS_DP_ATTR_NAME]) 1579 dp = get_dp(net, ovs_header->dp_ifindex); 1580 else { 1581 struct vport *vport; 1582 1583 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1584 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1585 } 1586 return dp ? dp : ERR_PTR(-ENODEV); 1587 } 1588 1589 static void ovs_dp_reset_user_features(struct sk_buff *skb, 1590 struct genl_info *info) 1591 { 1592 struct datapath *dp; 1593 1594 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, 1595 info->attrs); 1596 if (IS_ERR(dp)) 1597 return; 1598 1599 WARN(dp->user_features, "Dropping previously announced user features\n"); 1600 dp->user_features = 0; 1601 } 1602 1603 DEFINE_STATIC_KEY_FALSE(tc_recirc_sharing_support); 1604 1605 static int ovs_dp_set_upcall_portids(struct datapath *dp, 1606 const struct nlattr *ids) 1607 { 1608 struct dp_nlsk_pids *old, *dp_nlsk_pids; 1609 1610 if (!nla_len(ids) || nla_len(ids) % sizeof(u32)) 1611 return -EINVAL; 1612 1613 old = ovsl_dereference(dp->upcall_portids); 1614 1615 dp_nlsk_pids = kmalloc(sizeof(*dp_nlsk_pids) + nla_len(ids), 1616 GFP_KERNEL); 1617 if (!dp_nlsk_pids) 1618 return -ENOMEM; 1619 1620 dp_nlsk_pids->n_pids = nla_len(ids) / sizeof(u32); 1621 nla_memcpy(dp_nlsk_pids->pids, ids, nla_len(ids)); 1622 1623 rcu_assign_pointer(dp->upcall_portids, dp_nlsk_pids); 1624 1625 kfree_rcu(old, rcu); 1626 1627 return 0; 1628 } 1629 1630 u32 ovs_dp_get_upcall_portid(const struct datapath *dp, uint32_t cpu_id) 1631 { 1632 struct dp_nlsk_pids *dp_nlsk_pids; 1633 1634 dp_nlsk_pids = rcu_dereference(dp->upcall_portids); 1635 1636 if (dp_nlsk_pids) { 1637 if (cpu_id < dp_nlsk_pids->n_pids) { 1638 return dp_nlsk_pids->pids[cpu_id]; 1639 } else if (dp_nlsk_pids->n_pids > 0 && cpu_id >= dp_nlsk_pids->n_pids) { 1640 /* If the number of netlink PIDs is mismatched with the number of 1641 * CPUs as seen by the kernel, log this and send the upcall to an 1642 * arbitrary socket (0) in order to not drop packets 1643 */ 1644 pr_info_ratelimited("cpu_id mismatch with handler threads"); 1645 return dp_nlsk_pids->pids[cpu_id % dp_nlsk_pids->n_pids]; 1646 } else { 1647 return 0; 1648 } 1649 } else { 1650 return 0; 1651 } 1652 } 1653 1654 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1655 { 1656 u32 user_features = 0; 1657 int err; 1658 1659 if (a[OVS_DP_ATTR_USER_FEATURES]) { 1660 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1661 1662 if (user_features & ~(OVS_DP_F_VPORT_PIDS | 1663 OVS_DP_F_UNALIGNED | 1664 OVS_DP_F_TC_RECIRC_SHARING | 1665 OVS_DP_F_DISPATCH_UPCALL_PER_CPU)) 1666 return -EOPNOTSUPP; 1667 1668 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT) 1669 if (user_features & OVS_DP_F_TC_RECIRC_SHARING) 1670 return -EOPNOTSUPP; 1671 #endif 1672 } 1673 1674 if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) { 1675 int err; 1676 u32 cache_size; 1677 1678 cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]); 1679 err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size); 1680 if (err) 1681 return err; 1682 } 1683 1684 dp->user_features = user_features; 1685 1686 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU && 1687 a[OVS_DP_ATTR_PER_CPU_PIDS]) { 1688 /* Upcall Netlink Port IDs have been updated */ 1689 err = ovs_dp_set_upcall_portids(dp, 1690 a[OVS_DP_ATTR_PER_CPU_PIDS]); 1691 if (err) 1692 return err; 1693 } 1694 1695 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) 1696 static_branch_enable(&tc_recirc_sharing_support); 1697 else 1698 static_branch_disable(&tc_recirc_sharing_support); 1699 1700 return 0; 1701 } 1702 1703 static int ovs_dp_stats_init(struct datapath *dp) 1704 { 1705 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1706 if (!dp->stats_percpu) 1707 return -ENOMEM; 1708 1709 return 0; 1710 } 1711 1712 static int ovs_dp_vport_init(struct datapath *dp) 1713 { 1714 int i; 1715 1716 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS, 1717 sizeof(struct hlist_head), 1718 GFP_KERNEL); 1719 if (!dp->ports) 1720 return -ENOMEM; 1721 1722 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1723 INIT_HLIST_HEAD(&dp->ports[i]); 1724 1725 return 0; 1726 } 1727 1728 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1729 { 1730 struct nlattr **a = info->attrs; 1731 struct vport_parms parms; 1732 struct sk_buff *reply; 1733 struct datapath *dp; 1734 struct vport *vport; 1735 struct ovs_net *ovs_net; 1736 int err; 1737 1738 err = -EINVAL; 1739 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1740 goto err; 1741 1742 reply = ovs_dp_cmd_alloc_info(); 1743 if (!reply) 1744 return -ENOMEM; 1745 1746 err = -ENOMEM; 1747 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1748 if (dp == NULL) 1749 goto err_destroy_reply; 1750 1751 ovs_dp_set_net(dp, sock_net(skb->sk)); 1752 1753 /* Allocate table. */ 1754 err = ovs_flow_tbl_init(&dp->table); 1755 if (err) 1756 goto err_destroy_dp; 1757 1758 err = ovs_dp_stats_init(dp); 1759 if (err) 1760 goto err_destroy_table; 1761 1762 err = ovs_dp_vport_init(dp); 1763 if (err) 1764 goto err_destroy_stats; 1765 1766 err = ovs_meters_init(dp); 1767 if (err) 1768 goto err_destroy_ports; 1769 1770 /* Set up our datapath device. */ 1771 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1772 parms.type = OVS_VPORT_TYPE_INTERNAL; 1773 parms.options = NULL; 1774 parms.dp = dp; 1775 parms.port_no = OVSP_LOCAL; 1776 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1777 1778 /* So far only local changes have been made, now need the lock. */ 1779 ovs_lock(); 1780 1781 err = ovs_dp_change(dp, a); 1782 if (err) 1783 goto err_unlock_and_destroy_meters; 1784 1785 vport = new_vport(&parms); 1786 if (IS_ERR(vport)) { 1787 err = PTR_ERR(vport); 1788 if (err == -EBUSY) 1789 err = -EEXIST; 1790 1791 if (err == -EEXIST) { 1792 /* An outdated user space instance that does not understand 1793 * the concept of user_features has attempted to create a new 1794 * datapath and is likely to reuse it. Drop all user features. 1795 */ 1796 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1797 ovs_dp_reset_user_features(skb, info); 1798 } 1799 1800 goto err_unlock_and_destroy_meters; 1801 } 1802 1803 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1804 info->snd_seq, 0, OVS_DP_CMD_NEW); 1805 BUG_ON(err < 0); 1806 1807 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1808 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1809 1810 ovs_unlock(); 1811 1812 ovs_notify(&dp_datapath_genl_family, reply, info); 1813 return 0; 1814 1815 err_unlock_and_destroy_meters: 1816 ovs_unlock(); 1817 ovs_meters_exit(dp); 1818 err_destroy_ports: 1819 kfree(dp->ports); 1820 err_destroy_stats: 1821 free_percpu(dp->stats_percpu); 1822 err_destroy_table: 1823 ovs_flow_tbl_destroy(&dp->table); 1824 err_destroy_dp: 1825 kfree(dp); 1826 err_destroy_reply: 1827 kfree_skb(reply); 1828 err: 1829 return err; 1830 } 1831 1832 /* Called with ovs_mutex. */ 1833 static void __dp_destroy(struct datapath *dp) 1834 { 1835 struct flow_table *table = &dp->table; 1836 int i; 1837 1838 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1839 struct vport *vport; 1840 struct hlist_node *n; 1841 1842 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1843 if (vport->port_no != OVSP_LOCAL) 1844 ovs_dp_detach_port(vport); 1845 } 1846 1847 list_del_rcu(&dp->list_node); 1848 1849 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1850 * all ports in datapath are destroyed first before freeing datapath. 1851 */ 1852 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1853 1854 /* Flush sw_flow in the tables. RCU cb only releases resource 1855 * such as dp, ports and tables. That may avoid some issues 1856 * such as RCU usage warning. 1857 */ 1858 table_instance_flow_flush(table, ovsl_dereference(table->ti), 1859 ovsl_dereference(table->ufid_ti)); 1860 1861 /* RCU destroy the ports, meters and flow tables. */ 1862 call_rcu(&dp->rcu, destroy_dp_rcu); 1863 } 1864 1865 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1866 { 1867 struct sk_buff *reply; 1868 struct datapath *dp; 1869 int err; 1870 1871 reply = ovs_dp_cmd_alloc_info(); 1872 if (!reply) 1873 return -ENOMEM; 1874 1875 ovs_lock(); 1876 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1877 err = PTR_ERR(dp); 1878 if (IS_ERR(dp)) 1879 goto err_unlock_free; 1880 1881 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1882 info->snd_seq, 0, OVS_DP_CMD_DEL); 1883 BUG_ON(err < 0); 1884 1885 __dp_destroy(dp); 1886 ovs_unlock(); 1887 1888 ovs_notify(&dp_datapath_genl_family, reply, info); 1889 1890 return 0; 1891 1892 err_unlock_free: 1893 ovs_unlock(); 1894 kfree_skb(reply); 1895 return err; 1896 } 1897 1898 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1899 { 1900 struct sk_buff *reply; 1901 struct datapath *dp; 1902 int err; 1903 1904 reply = ovs_dp_cmd_alloc_info(); 1905 if (!reply) 1906 return -ENOMEM; 1907 1908 ovs_lock(); 1909 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1910 err = PTR_ERR(dp); 1911 if (IS_ERR(dp)) 1912 goto err_unlock_free; 1913 1914 err = ovs_dp_change(dp, info->attrs); 1915 if (err) 1916 goto err_unlock_free; 1917 1918 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1919 info->snd_seq, 0, OVS_DP_CMD_SET); 1920 BUG_ON(err < 0); 1921 1922 ovs_unlock(); 1923 ovs_notify(&dp_datapath_genl_family, reply, info); 1924 1925 return 0; 1926 1927 err_unlock_free: 1928 ovs_unlock(); 1929 kfree_skb(reply); 1930 return err; 1931 } 1932 1933 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1934 { 1935 struct sk_buff *reply; 1936 struct datapath *dp; 1937 int err; 1938 1939 reply = ovs_dp_cmd_alloc_info(); 1940 if (!reply) 1941 return -ENOMEM; 1942 1943 ovs_lock(); 1944 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1945 if (IS_ERR(dp)) { 1946 err = PTR_ERR(dp); 1947 goto err_unlock_free; 1948 } 1949 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1950 info->snd_seq, 0, OVS_DP_CMD_GET); 1951 BUG_ON(err < 0); 1952 ovs_unlock(); 1953 1954 return genlmsg_reply(reply, info); 1955 1956 err_unlock_free: 1957 ovs_unlock(); 1958 kfree_skb(reply); 1959 return err; 1960 } 1961 1962 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1963 { 1964 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1965 struct datapath *dp; 1966 int skip = cb->args[0]; 1967 int i = 0; 1968 1969 ovs_lock(); 1970 list_for_each_entry(dp, &ovs_net->dps, list_node) { 1971 if (i >= skip && 1972 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 1973 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1974 OVS_DP_CMD_GET) < 0) 1975 break; 1976 i++; 1977 } 1978 ovs_unlock(); 1979 1980 cb->args[0] = i; 1981 1982 return skb->len; 1983 } 1984 1985 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 1986 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 1987 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 1988 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 1989 [OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0, 1990 PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)), 1991 }; 1992 1993 static const struct genl_small_ops dp_datapath_genl_ops[] = { 1994 { .cmd = OVS_DP_CMD_NEW, 1995 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1996 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1997 .doit = ovs_dp_cmd_new 1998 }, 1999 { .cmd = OVS_DP_CMD_DEL, 2000 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2001 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2002 .doit = ovs_dp_cmd_del 2003 }, 2004 { .cmd = OVS_DP_CMD_GET, 2005 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2006 .flags = 0, /* OK for unprivileged users. */ 2007 .doit = ovs_dp_cmd_get, 2008 .dumpit = ovs_dp_cmd_dump 2009 }, 2010 { .cmd = OVS_DP_CMD_SET, 2011 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2012 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2013 .doit = ovs_dp_cmd_set, 2014 }, 2015 }; 2016 2017 static struct genl_family dp_datapath_genl_family __ro_after_init = { 2018 .hdrsize = sizeof(struct ovs_header), 2019 .name = OVS_DATAPATH_FAMILY, 2020 .version = OVS_DATAPATH_VERSION, 2021 .maxattr = OVS_DP_ATTR_MAX, 2022 .policy = datapath_policy, 2023 .netnsok = true, 2024 .parallel_ops = true, 2025 .small_ops = dp_datapath_genl_ops, 2026 .n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops), 2027 .mcgrps = &ovs_dp_datapath_multicast_group, 2028 .n_mcgrps = 1, 2029 .module = THIS_MODULE, 2030 }; 2031 2032 /* Called with ovs_mutex or RCU read lock. */ 2033 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 2034 struct net *net, u32 portid, u32 seq, 2035 u32 flags, u8 cmd, gfp_t gfp) 2036 { 2037 struct ovs_header *ovs_header; 2038 struct ovs_vport_stats vport_stats; 2039 int err; 2040 2041 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 2042 flags, cmd); 2043 if (!ovs_header) 2044 return -EMSGSIZE; 2045 2046 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 2047 2048 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 2049 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 2050 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 2051 ovs_vport_name(vport)) || 2052 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex)) 2053 goto nla_put_failure; 2054 2055 if (!net_eq(net, dev_net(vport->dev))) { 2056 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp); 2057 2058 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id)) 2059 goto nla_put_failure; 2060 } 2061 2062 ovs_vport_get_stats(vport, &vport_stats); 2063 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS, 2064 sizeof(struct ovs_vport_stats), &vport_stats, 2065 OVS_VPORT_ATTR_PAD)) 2066 goto nla_put_failure; 2067 2068 if (ovs_vport_get_upcall_portids(vport, skb)) 2069 goto nla_put_failure; 2070 2071 err = ovs_vport_get_options(vport, skb); 2072 if (err == -EMSGSIZE) 2073 goto error; 2074 2075 genlmsg_end(skb, ovs_header); 2076 return 0; 2077 2078 nla_put_failure: 2079 err = -EMSGSIZE; 2080 error: 2081 genlmsg_cancel(skb, ovs_header); 2082 return err; 2083 } 2084 2085 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 2086 { 2087 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2088 } 2089 2090 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 2091 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net, 2092 u32 portid, u32 seq, u8 cmd) 2093 { 2094 struct sk_buff *skb; 2095 int retval; 2096 2097 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2098 if (!skb) 2099 return ERR_PTR(-ENOMEM); 2100 2101 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd, 2102 GFP_KERNEL); 2103 BUG_ON(retval < 0); 2104 2105 return skb; 2106 } 2107 2108 /* Called with ovs_mutex or RCU read lock. */ 2109 static struct vport *lookup_vport(struct net *net, 2110 const struct ovs_header *ovs_header, 2111 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 2112 { 2113 struct datapath *dp; 2114 struct vport *vport; 2115 2116 if (a[OVS_VPORT_ATTR_IFINDEX]) 2117 return ERR_PTR(-EOPNOTSUPP); 2118 if (a[OVS_VPORT_ATTR_NAME]) { 2119 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 2120 if (!vport) 2121 return ERR_PTR(-ENODEV); 2122 if (ovs_header->dp_ifindex && 2123 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 2124 return ERR_PTR(-ENODEV); 2125 return vport; 2126 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 2127 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 2128 2129 if (port_no >= DP_MAX_PORTS) 2130 return ERR_PTR(-EFBIG); 2131 2132 dp = get_dp(net, ovs_header->dp_ifindex); 2133 if (!dp) 2134 return ERR_PTR(-ENODEV); 2135 2136 vport = ovs_vport_ovsl_rcu(dp, port_no); 2137 if (!vport) 2138 return ERR_PTR(-ENODEV); 2139 return vport; 2140 } else 2141 return ERR_PTR(-EINVAL); 2142 2143 } 2144 2145 static unsigned int ovs_get_max_headroom(struct datapath *dp) 2146 { 2147 unsigned int dev_headroom, max_headroom = 0; 2148 struct net_device *dev; 2149 struct vport *vport; 2150 int i; 2151 2152 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2153 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, 2154 lockdep_ovsl_is_held()) { 2155 dev = vport->dev; 2156 dev_headroom = netdev_get_fwd_headroom(dev); 2157 if (dev_headroom > max_headroom) 2158 max_headroom = dev_headroom; 2159 } 2160 } 2161 2162 return max_headroom; 2163 } 2164 2165 /* Called with ovs_mutex */ 2166 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom) 2167 { 2168 struct vport *vport; 2169 int i; 2170 2171 dp->max_headroom = new_headroom; 2172 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2173 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, 2174 lockdep_ovsl_is_held()) 2175 netdev_set_rx_headroom(vport->dev, new_headroom); 2176 } 2177 } 2178 2179 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 2180 { 2181 struct nlattr **a = info->attrs; 2182 struct ovs_header *ovs_header = info->userhdr; 2183 struct vport_parms parms; 2184 struct sk_buff *reply; 2185 struct vport *vport; 2186 struct datapath *dp; 2187 unsigned int new_headroom; 2188 u32 port_no; 2189 int err; 2190 2191 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 2192 !a[OVS_VPORT_ATTR_UPCALL_PID]) 2193 return -EINVAL; 2194 if (a[OVS_VPORT_ATTR_IFINDEX]) 2195 return -EOPNOTSUPP; 2196 2197 port_no = a[OVS_VPORT_ATTR_PORT_NO] 2198 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 2199 if (port_no >= DP_MAX_PORTS) 2200 return -EFBIG; 2201 2202 reply = ovs_vport_cmd_alloc_info(); 2203 if (!reply) 2204 return -ENOMEM; 2205 2206 ovs_lock(); 2207 restart: 2208 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 2209 err = -ENODEV; 2210 if (!dp) 2211 goto exit_unlock_free; 2212 2213 if (port_no) { 2214 vport = ovs_vport_ovsl(dp, port_no); 2215 err = -EBUSY; 2216 if (vport) 2217 goto exit_unlock_free; 2218 } else { 2219 for (port_no = 1; ; port_no++) { 2220 if (port_no >= DP_MAX_PORTS) { 2221 err = -EFBIG; 2222 goto exit_unlock_free; 2223 } 2224 vport = ovs_vport_ovsl(dp, port_no); 2225 if (!vport) 2226 break; 2227 } 2228 } 2229 2230 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 2231 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 2232 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 2233 parms.dp = dp; 2234 parms.port_no = port_no; 2235 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2236 2237 vport = new_vport(&parms); 2238 err = PTR_ERR(vport); 2239 if (IS_ERR(vport)) { 2240 if (err == -EAGAIN) 2241 goto restart; 2242 goto exit_unlock_free; 2243 } 2244 2245 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2246 info->snd_portid, info->snd_seq, 0, 2247 OVS_VPORT_CMD_NEW, GFP_KERNEL); 2248 2249 new_headroom = netdev_get_fwd_headroom(vport->dev); 2250 2251 if (new_headroom > dp->max_headroom) 2252 ovs_update_headroom(dp, new_headroom); 2253 else 2254 netdev_set_rx_headroom(vport->dev, dp->max_headroom); 2255 2256 BUG_ON(err < 0); 2257 ovs_unlock(); 2258 2259 ovs_notify(&dp_vport_genl_family, reply, info); 2260 return 0; 2261 2262 exit_unlock_free: 2263 ovs_unlock(); 2264 kfree_skb(reply); 2265 return err; 2266 } 2267 2268 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 2269 { 2270 struct nlattr **a = info->attrs; 2271 struct sk_buff *reply; 2272 struct vport *vport; 2273 int err; 2274 2275 reply = ovs_vport_cmd_alloc_info(); 2276 if (!reply) 2277 return -ENOMEM; 2278 2279 ovs_lock(); 2280 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2281 err = PTR_ERR(vport); 2282 if (IS_ERR(vport)) 2283 goto exit_unlock_free; 2284 2285 if (a[OVS_VPORT_ATTR_TYPE] && 2286 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 2287 err = -EINVAL; 2288 goto exit_unlock_free; 2289 } 2290 2291 if (a[OVS_VPORT_ATTR_OPTIONS]) { 2292 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 2293 if (err) 2294 goto exit_unlock_free; 2295 } 2296 2297 2298 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 2299 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2300 2301 err = ovs_vport_set_upcall_portids(vport, ids); 2302 if (err) 2303 goto exit_unlock_free; 2304 } 2305 2306 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2307 info->snd_portid, info->snd_seq, 0, 2308 OVS_VPORT_CMD_SET, GFP_KERNEL); 2309 BUG_ON(err < 0); 2310 2311 ovs_unlock(); 2312 ovs_notify(&dp_vport_genl_family, reply, info); 2313 return 0; 2314 2315 exit_unlock_free: 2316 ovs_unlock(); 2317 kfree_skb(reply); 2318 return err; 2319 } 2320 2321 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2322 { 2323 bool update_headroom = false; 2324 struct nlattr **a = info->attrs; 2325 struct sk_buff *reply; 2326 struct datapath *dp; 2327 struct vport *vport; 2328 unsigned int new_headroom; 2329 int err; 2330 2331 reply = ovs_vport_cmd_alloc_info(); 2332 if (!reply) 2333 return -ENOMEM; 2334 2335 ovs_lock(); 2336 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2337 err = PTR_ERR(vport); 2338 if (IS_ERR(vport)) 2339 goto exit_unlock_free; 2340 2341 if (vport->port_no == OVSP_LOCAL) { 2342 err = -EINVAL; 2343 goto exit_unlock_free; 2344 } 2345 2346 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2347 info->snd_portid, info->snd_seq, 0, 2348 OVS_VPORT_CMD_DEL, GFP_KERNEL); 2349 BUG_ON(err < 0); 2350 2351 /* the vport deletion may trigger dp headroom update */ 2352 dp = vport->dp; 2353 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom) 2354 update_headroom = true; 2355 2356 netdev_reset_rx_headroom(vport->dev); 2357 ovs_dp_detach_port(vport); 2358 2359 if (update_headroom) { 2360 new_headroom = ovs_get_max_headroom(dp); 2361 2362 if (new_headroom < dp->max_headroom) 2363 ovs_update_headroom(dp, new_headroom); 2364 } 2365 ovs_unlock(); 2366 2367 ovs_notify(&dp_vport_genl_family, reply, info); 2368 return 0; 2369 2370 exit_unlock_free: 2371 ovs_unlock(); 2372 kfree_skb(reply); 2373 return err; 2374 } 2375 2376 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2377 { 2378 struct nlattr **a = info->attrs; 2379 struct ovs_header *ovs_header = info->userhdr; 2380 struct sk_buff *reply; 2381 struct vport *vport; 2382 int err; 2383 2384 reply = ovs_vport_cmd_alloc_info(); 2385 if (!reply) 2386 return -ENOMEM; 2387 2388 rcu_read_lock(); 2389 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2390 err = PTR_ERR(vport); 2391 if (IS_ERR(vport)) 2392 goto exit_unlock_free; 2393 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2394 info->snd_portid, info->snd_seq, 0, 2395 OVS_VPORT_CMD_GET, GFP_ATOMIC); 2396 BUG_ON(err < 0); 2397 rcu_read_unlock(); 2398 2399 return genlmsg_reply(reply, info); 2400 2401 exit_unlock_free: 2402 rcu_read_unlock(); 2403 kfree_skb(reply); 2404 return err; 2405 } 2406 2407 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2408 { 2409 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2410 struct datapath *dp; 2411 int bucket = cb->args[0], skip = cb->args[1]; 2412 int i, j = 0; 2413 2414 rcu_read_lock(); 2415 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2416 if (!dp) { 2417 rcu_read_unlock(); 2418 return -ENODEV; 2419 } 2420 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2421 struct vport *vport; 2422 2423 j = 0; 2424 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2425 if (j >= skip && 2426 ovs_vport_cmd_fill_info(vport, skb, 2427 sock_net(skb->sk), 2428 NETLINK_CB(cb->skb).portid, 2429 cb->nlh->nlmsg_seq, 2430 NLM_F_MULTI, 2431 OVS_VPORT_CMD_GET, 2432 GFP_ATOMIC) < 0) 2433 goto out; 2434 2435 j++; 2436 } 2437 skip = 0; 2438 } 2439 out: 2440 rcu_read_unlock(); 2441 2442 cb->args[0] = i; 2443 cb->args[1] = j; 2444 2445 return skb->len; 2446 } 2447 2448 static void ovs_dp_masks_rebalance(struct work_struct *work) 2449 { 2450 struct ovs_net *ovs_net = container_of(work, struct ovs_net, 2451 masks_rebalance.work); 2452 struct datapath *dp; 2453 2454 ovs_lock(); 2455 2456 list_for_each_entry(dp, &ovs_net->dps, list_node) 2457 ovs_flow_masks_rebalance(&dp->table); 2458 2459 ovs_unlock(); 2460 2461 schedule_delayed_work(&ovs_net->masks_rebalance, 2462 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL)); 2463 } 2464 2465 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2466 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2467 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2468 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2469 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2470 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC }, 2471 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2472 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 }, 2473 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 }, 2474 }; 2475 2476 static const struct genl_small_ops dp_vport_genl_ops[] = { 2477 { .cmd = OVS_VPORT_CMD_NEW, 2478 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2479 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2480 .doit = ovs_vport_cmd_new 2481 }, 2482 { .cmd = OVS_VPORT_CMD_DEL, 2483 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2484 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2485 .doit = ovs_vport_cmd_del 2486 }, 2487 { .cmd = OVS_VPORT_CMD_GET, 2488 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2489 .flags = 0, /* OK for unprivileged users. */ 2490 .doit = ovs_vport_cmd_get, 2491 .dumpit = ovs_vport_cmd_dump 2492 }, 2493 { .cmd = OVS_VPORT_CMD_SET, 2494 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2495 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2496 .doit = ovs_vport_cmd_set, 2497 }, 2498 }; 2499 2500 struct genl_family dp_vport_genl_family __ro_after_init = { 2501 .hdrsize = sizeof(struct ovs_header), 2502 .name = OVS_VPORT_FAMILY, 2503 .version = OVS_VPORT_VERSION, 2504 .maxattr = OVS_VPORT_ATTR_MAX, 2505 .policy = vport_policy, 2506 .netnsok = true, 2507 .parallel_ops = true, 2508 .small_ops = dp_vport_genl_ops, 2509 .n_small_ops = ARRAY_SIZE(dp_vport_genl_ops), 2510 .mcgrps = &ovs_dp_vport_multicast_group, 2511 .n_mcgrps = 1, 2512 .module = THIS_MODULE, 2513 }; 2514 2515 static struct genl_family * const dp_genl_families[] = { 2516 &dp_datapath_genl_family, 2517 &dp_vport_genl_family, 2518 &dp_flow_genl_family, 2519 &dp_packet_genl_family, 2520 &dp_meter_genl_family, 2521 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 2522 &dp_ct_limit_genl_family, 2523 #endif 2524 }; 2525 2526 static void dp_unregister_genl(int n_families) 2527 { 2528 int i; 2529 2530 for (i = 0; i < n_families; i++) 2531 genl_unregister_family(dp_genl_families[i]); 2532 } 2533 2534 static int __init dp_register_genl(void) 2535 { 2536 int err; 2537 int i; 2538 2539 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2540 2541 err = genl_register_family(dp_genl_families[i]); 2542 if (err) 2543 goto error; 2544 } 2545 2546 return 0; 2547 2548 error: 2549 dp_unregister_genl(i); 2550 return err; 2551 } 2552 2553 static int __net_init ovs_init_net(struct net *net) 2554 { 2555 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2556 int err; 2557 2558 INIT_LIST_HEAD(&ovs_net->dps); 2559 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2560 INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance); 2561 2562 err = ovs_ct_init(net); 2563 if (err) 2564 return err; 2565 2566 schedule_delayed_work(&ovs_net->masks_rebalance, 2567 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL)); 2568 return 0; 2569 } 2570 2571 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2572 struct list_head *head) 2573 { 2574 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2575 struct datapath *dp; 2576 2577 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2578 int i; 2579 2580 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2581 struct vport *vport; 2582 2583 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2584 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2585 continue; 2586 2587 if (dev_net(vport->dev) == dnet) 2588 list_add(&vport->detach_list, head); 2589 } 2590 } 2591 } 2592 } 2593 2594 static void __net_exit ovs_exit_net(struct net *dnet) 2595 { 2596 struct datapath *dp, *dp_next; 2597 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2598 struct vport *vport, *vport_next; 2599 struct net *net; 2600 LIST_HEAD(head); 2601 2602 ovs_lock(); 2603 2604 ovs_ct_exit(dnet); 2605 2606 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2607 __dp_destroy(dp); 2608 2609 down_read(&net_rwsem); 2610 for_each_net(net) 2611 list_vports_from_net(net, dnet, &head); 2612 up_read(&net_rwsem); 2613 2614 /* Detach all vports from given namespace. */ 2615 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2616 list_del(&vport->detach_list); 2617 ovs_dp_detach_port(vport); 2618 } 2619 2620 ovs_unlock(); 2621 2622 cancel_delayed_work_sync(&ovs_net->masks_rebalance); 2623 cancel_work_sync(&ovs_net->dp_notify_work); 2624 } 2625 2626 static struct pernet_operations ovs_net_ops = { 2627 .init = ovs_init_net, 2628 .exit = ovs_exit_net, 2629 .id = &ovs_net_id, 2630 .size = sizeof(struct ovs_net), 2631 }; 2632 2633 static int __init dp_init(void) 2634 { 2635 int err; 2636 2637 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > 2638 sizeof_field(struct sk_buff, cb)); 2639 2640 pr_info("Open vSwitch switching datapath\n"); 2641 2642 err = action_fifos_init(); 2643 if (err) 2644 goto error; 2645 2646 err = ovs_internal_dev_rtnl_link_register(); 2647 if (err) 2648 goto error_action_fifos_exit; 2649 2650 err = ovs_flow_init(); 2651 if (err) 2652 goto error_unreg_rtnl_link; 2653 2654 err = ovs_vport_init(); 2655 if (err) 2656 goto error_flow_exit; 2657 2658 err = register_pernet_device(&ovs_net_ops); 2659 if (err) 2660 goto error_vport_exit; 2661 2662 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2663 if (err) 2664 goto error_netns_exit; 2665 2666 err = ovs_netdev_init(); 2667 if (err) 2668 goto error_unreg_notifier; 2669 2670 err = dp_register_genl(); 2671 if (err < 0) 2672 goto error_unreg_netdev; 2673 2674 return 0; 2675 2676 error_unreg_netdev: 2677 ovs_netdev_exit(); 2678 error_unreg_notifier: 2679 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2680 error_netns_exit: 2681 unregister_pernet_device(&ovs_net_ops); 2682 error_vport_exit: 2683 ovs_vport_exit(); 2684 error_flow_exit: 2685 ovs_flow_exit(); 2686 error_unreg_rtnl_link: 2687 ovs_internal_dev_rtnl_link_unregister(); 2688 error_action_fifos_exit: 2689 action_fifos_exit(); 2690 error: 2691 return err; 2692 } 2693 2694 static void dp_cleanup(void) 2695 { 2696 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2697 ovs_netdev_exit(); 2698 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2699 unregister_pernet_device(&ovs_net_ops); 2700 rcu_barrier(); 2701 ovs_vport_exit(); 2702 ovs_flow_exit(); 2703 ovs_internal_dev_rtnl_link_unregister(); 2704 action_fifos_exit(); 2705 } 2706 2707 module_init(dp_init); 2708 module_exit(dp_cleanup); 2709 2710 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2711 MODULE_LICENSE("GPL"); 2712 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY); 2713 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY); 2714 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY); 2715 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY); 2716 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY); 2717 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY); 2718