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/kernel.h> 19 #include <linux/kthread.h> 20 #include <linux/mutex.h> 21 #include <linux/percpu.h> 22 #include <linux/rcupdate.h> 23 #include <linux/tcp.h> 24 #include <linux/udp.h> 25 #include <linux/ethtool.h> 26 #include <linux/wait.h> 27 #include <asm/div64.h> 28 #include <linux/highmem.h> 29 #include <linux/netfilter_bridge.h> 30 #include <linux/netfilter_ipv4.h> 31 #include <linux/inetdevice.h> 32 #include <linux/list.h> 33 #include <linux/openvswitch.h> 34 #include <linux/rculist.h> 35 #include <linux/dmi.h> 36 #include <net/genetlink.h> 37 #include <net/gso.h> 38 #include <net/net_namespace.h> 39 #include <net/netns/generic.h> 40 #include <net/pkt_cls.h> 41 42 #include "datapath.h" 43 #include "drop.h" 44 #include "flow.h" 45 #include "flow_table.h" 46 #include "flow_netlink.h" 47 #include "meter.h" 48 #include "openvswitch_trace.h" 49 #include "vport-internal_dev.h" 50 #include "vport-netdev.h" 51 52 unsigned int ovs_net_id __read_mostly; 53 54 static struct genl_family dp_packet_genl_family; 55 static struct genl_family dp_flow_genl_family; 56 static struct genl_family dp_datapath_genl_family; 57 58 static const struct nla_policy flow_policy[]; 59 60 static const struct genl_multicast_group ovs_dp_flow_multicast_group = { 61 .name = OVS_FLOW_MCGROUP, 62 }; 63 64 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = { 65 .name = OVS_DATAPATH_MCGROUP, 66 }; 67 68 static const struct genl_multicast_group ovs_dp_vport_multicast_group = { 69 .name = OVS_VPORT_MCGROUP, 70 }; 71 72 /* Check if need to build a reply message. 73 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */ 74 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info, 75 unsigned int group) 76 { 77 return info->nlhdr->nlmsg_flags & NLM_F_ECHO || 78 genl_has_listeners(family, genl_info_net(info), group); 79 } 80 81 static void ovs_notify(struct genl_family *family, 82 struct sk_buff *skb, struct genl_info *info) 83 { 84 genl_notify(family, skb, info, 0, GFP_KERNEL); 85 } 86 87 /** 88 * DOC: Locking: 89 * 90 * All writes e.g. Writes to device state (add/remove datapath, port, set 91 * operations on vports, etc.), Writes to other state (flow table 92 * modifications, set miscellaneous datapath parameters, etc.) are protected 93 * by ovs_lock. 94 * 95 * Reads are protected by RCU. 96 * 97 * There are a few special cases (mostly stats) that have their own 98 * synchronization but they nest under all of above and don't interact with 99 * each other. 100 * 101 * The RTNL lock nests inside ovs_mutex. 102 */ 103 104 static DEFINE_MUTEX(ovs_mutex); 105 106 void ovs_lock(void) 107 { 108 mutex_lock(&ovs_mutex); 109 } 110 111 void ovs_unlock(void) 112 { 113 mutex_unlock(&ovs_mutex); 114 } 115 116 #ifdef CONFIG_LOCKDEP 117 int lockdep_ovsl_is_held(void) 118 { 119 if (debug_locks) 120 return lockdep_is_held(&ovs_mutex); 121 else 122 return 1; 123 } 124 #endif 125 126 static struct vport *new_vport(const struct vport_parms *); 127 static int queue_gso_packets(struct datapath *dp, struct sk_buff *, 128 const struct sw_flow_key *, 129 const struct dp_upcall_info *, 130 uint32_t cutlen); 131 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *, 132 const struct sw_flow_key *, 133 const struct dp_upcall_info *, 134 uint32_t cutlen); 135 136 static void ovs_dp_masks_rebalance(struct work_struct *work); 137 138 static int ovs_dp_set_upcall_portids(struct datapath *, const struct nlattr *); 139 140 /* Must be called with rcu_read_lock or ovs_mutex. */ 141 const char *ovs_dp_name(const struct datapath *dp) 142 { 143 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); 144 return ovs_vport_name(vport); 145 } 146 147 static int get_dpifindex(const struct datapath *dp) 148 { 149 struct vport *local; 150 int ifindex; 151 152 rcu_read_lock(); 153 154 local = ovs_vport_rcu(dp, OVSP_LOCAL); 155 if (local) 156 ifindex = local->dev->ifindex; 157 else 158 ifindex = 0; 159 160 rcu_read_unlock(); 161 162 return ifindex; 163 } 164 165 static void destroy_dp_rcu(struct rcu_head *rcu) 166 { 167 struct datapath *dp = container_of(rcu, struct datapath, rcu); 168 169 ovs_flow_tbl_destroy(&dp->table); 170 free_percpu(dp->stats_percpu); 171 kfree(dp->ports); 172 ovs_meters_exit(dp); 173 kfree(rcu_dereference_raw(dp->upcall_portids)); 174 kfree(dp); 175 } 176 177 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 178 u16 port_no) 179 { 180 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 181 } 182 183 /* Called with ovs_mutex or RCU read lock. */ 184 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 185 { 186 struct vport *vport; 187 struct hlist_head *head; 188 189 head = vport_hash_bucket(dp, port_no); 190 hlist_for_each_entry_rcu(vport, head, dp_hash_node, 191 lockdep_ovsl_is_held()) { 192 if (vport->port_no == port_no) 193 return vport; 194 } 195 return NULL; 196 } 197 198 /* Called with ovs_mutex. */ 199 static struct vport *new_vport(const struct vport_parms *parms) 200 { 201 struct vport *vport; 202 203 vport = ovs_vport_add(parms); 204 if (!IS_ERR(vport)) { 205 struct datapath *dp = parms->dp; 206 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 207 208 hlist_add_head_rcu(&vport->dp_hash_node, head); 209 } 210 return vport; 211 } 212 213 static void ovs_vport_update_upcall_stats(struct sk_buff *skb, 214 const struct dp_upcall_info *upcall_info, 215 bool upcall_result) 216 { 217 struct vport *p = OVS_CB(skb)->input_vport; 218 struct vport_upcall_stats_percpu *stats; 219 220 if (upcall_info->cmd != OVS_PACKET_CMD_MISS && 221 upcall_info->cmd != OVS_PACKET_CMD_ACTION) 222 return; 223 224 stats = this_cpu_ptr(p->upcall_stats); 225 u64_stats_update_begin(&stats->syncp); 226 if (upcall_result) 227 u64_stats_inc(&stats->n_success); 228 else 229 u64_stats_inc(&stats->n_fail); 230 u64_stats_update_end(&stats->syncp); 231 } 232 233 void ovs_dp_detach_port(struct vport *p) 234 { 235 ASSERT_OVSL(); 236 237 /* First drop references to device. */ 238 hlist_del_rcu(&p->dp_hash_node); 239 240 /* Then destroy it. */ 241 ovs_vport_del(p); 242 } 243 244 /* Must be called with rcu_read_lock. */ 245 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key) 246 { 247 struct ovs_pcpu_storage *ovs_pcpu = this_cpu_ptr(ovs_pcpu_storage); 248 const struct vport *p = OVS_CB(skb)->input_vport; 249 struct datapath *dp = p->dp; 250 struct sw_flow *flow; 251 struct sw_flow_actions *sf_acts; 252 struct dp_stats_percpu *stats; 253 bool ovs_pcpu_locked = false; 254 u64 *stats_counter; 255 u32 n_mask_hit; 256 u32 n_cache_hit; 257 int error; 258 259 stats = this_cpu_ptr(dp->stats_percpu); 260 261 /* Look up flow. */ 262 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb), 263 &n_mask_hit, &n_cache_hit); 264 if (unlikely(!flow)) { 265 struct dp_upcall_info upcall; 266 267 memset(&upcall, 0, sizeof(upcall)); 268 upcall.cmd = OVS_PACKET_CMD_MISS; 269 270 if (OVS_CB(skb)->upcall_pid) 271 upcall.portid = OVS_CB(skb)->upcall_pid; 272 else if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU) 273 upcall.portid = 274 ovs_dp_get_upcall_portid(dp, smp_processor_id()); 275 else 276 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 277 278 upcall.mru = OVS_CB(skb)->mru; 279 error = ovs_dp_upcall(dp, skb, key, &upcall, 0); 280 switch (error) { 281 case 0: 282 case -EAGAIN: 283 case -ERESTARTSYS: 284 case -EINTR: 285 consume_skb(skb); 286 break; 287 default: 288 kfree_skb(skb); 289 break; 290 } 291 stats_counter = &stats->n_missed; 292 goto out; 293 } 294 295 ovs_flow_stats_update(flow, key->tp.flags, skb); 296 sf_acts = rcu_dereference(flow->sf_acts); 297 /* This path can be invoked recursively: Use the current task to 298 * identify recursive invocation - the lock must be acquired only once. 299 * Even with disabled bottom halves this can be preempted on PREEMPT_RT. 300 * Limit the locking to RT to avoid assigning `owner' if it can be 301 * avoided. 302 */ 303 if (IS_ENABLED(CONFIG_PREEMPT_RT) && ovs_pcpu->owner != current) { 304 local_lock_nested_bh(&ovs_pcpu_storage->bh_lock); 305 ovs_pcpu->owner = current; 306 ovs_pcpu_locked = true; 307 } 308 309 error = ovs_execute_actions(dp, skb, sf_acts, key); 310 if (unlikely(error)) 311 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n", 312 ovs_dp_name(dp), error); 313 if (ovs_pcpu_locked) { 314 ovs_pcpu->owner = NULL; 315 local_unlock_nested_bh(&ovs_pcpu_storage->bh_lock); 316 } 317 318 stats_counter = &stats->n_hit; 319 320 out: 321 /* Update datapath statistics. */ 322 u64_stats_update_begin(&stats->syncp); 323 (*stats_counter)++; 324 stats->n_mask_hit += n_mask_hit; 325 stats->n_cache_hit += n_cache_hit; 326 u64_stats_update_end(&stats->syncp); 327 } 328 329 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 330 const struct sw_flow_key *key, 331 const struct dp_upcall_info *upcall_info, 332 uint32_t cutlen) 333 { 334 struct dp_stats_percpu *stats; 335 int err; 336 337 if (trace_ovs_dp_upcall_enabled()) 338 trace_ovs_dp_upcall(dp, skb, key, upcall_info); 339 340 if (upcall_info->portid == 0) { 341 err = -ENOTCONN; 342 goto err; 343 } 344 345 if (!skb_is_gso(skb)) 346 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 347 else 348 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen); 349 350 ovs_vport_update_upcall_stats(skb, upcall_info, !err); 351 if (err) 352 goto err; 353 354 return 0; 355 356 err: 357 stats = this_cpu_ptr(dp->stats_percpu); 358 359 u64_stats_update_begin(&stats->syncp); 360 stats->n_lost++; 361 u64_stats_update_end(&stats->syncp); 362 363 return err; 364 } 365 366 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 367 const struct sw_flow_key *key, 368 const struct dp_upcall_info *upcall_info, 369 uint32_t cutlen) 370 { 371 unsigned int gso_type = skb_shinfo(skb)->gso_type; 372 struct sw_flow_key later_key; 373 struct sk_buff *segs, *nskb; 374 int err; 375 376 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET); 377 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 378 if (IS_ERR(segs)) 379 return PTR_ERR(segs); 380 if (segs == NULL) 381 return -EINVAL; 382 383 if (gso_type & SKB_GSO_UDP) { 384 /* The initial flow key extracted by ovs_flow_key_extract() 385 * in this case is for a first fragment, so we need to 386 * properly mark later fragments. 387 */ 388 later_key = *key; 389 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 390 } 391 392 /* Queue all of the segments. */ 393 skb_list_walk_safe(segs, skb, nskb) { 394 if (gso_type & SKB_GSO_UDP && skb != segs) 395 key = &later_key; 396 397 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 398 if (err) 399 break; 400 401 } 402 403 /* Free all of the segments. */ 404 skb_list_walk_safe(segs, skb, nskb) { 405 if (err) 406 kfree_skb(skb); 407 else 408 consume_skb(skb); 409 } 410 return err; 411 } 412 413 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, 414 unsigned int hdrlen, int actions_attrlen) 415 { 416 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 417 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 418 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */ 419 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */ 420 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */ 421 422 /* OVS_PACKET_ATTR_USERDATA */ 423 if (upcall_info->userdata) 424 size += NLA_ALIGN(upcall_info->userdata->nla_len); 425 426 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ 427 if (upcall_info->egress_tun_info) 428 size += nla_total_size(ovs_tun_key_attr_size()); 429 430 /* OVS_PACKET_ATTR_ACTIONS */ 431 if (upcall_info->actions_len) 432 size += nla_total_size(actions_attrlen); 433 434 /* OVS_PACKET_ATTR_MRU */ 435 if (upcall_info->mru) 436 size += nla_total_size(sizeof(upcall_info->mru)); 437 438 return size; 439 } 440 441 static void pad_packet(struct datapath *dp, struct sk_buff *skb) 442 { 443 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 444 size_t plen = NLA_ALIGN(skb->len) - skb->len; 445 446 if (plen > 0) 447 skb_put_zero(skb, plen); 448 } 449 } 450 451 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 452 const struct sw_flow_key *key, 453 const struct dp_upcall_info *upcall_info, 454 uint32_t cutlen) 455 { 456 struct ovs_header *upcall; 457 struct sk_buff *nskb = NULL; 458 struct sk_buff *user_skb = NULL; /* to be queued to userspace */ 459 struct nlattr *nla; 460 size_t len; 461 unsigned int hlen; 462 int err, dp_ifindex; 463 u64 hash; 464 465 dp_ifindex = get_dpifindex(dp); 466 if (!dp_ifindex) 467 return -ENODEV; 468 469 if (skb_vlan_tag_present(skb)) { 470 nskb = skb_clone(skb, GFP_ATOMIC); 471 if (!nskb) 472 return -ENOMEM; 473 474 nskb = __vlan_hwaccel_push_inside(nskb); 475 if (!nskb) 476 return -ENOMEM; 477 478 skb = nskb; 479 } 480 481 if (nla_attr_size(skb->len) > USHRT_MAX) { 482 err = -EFBIG; 483 goto out; 484 } 485 486 /* Complete checksum if needed */ 487 if (skb->ip_summed == CHECKSUM_PARTIAL && 488 (err = skb_csum_hwoffload_help(skb, 0))) 489 goto out; 490 491 /* Older versions of OVS user space enforce alignment of the last 492 * Netlink attribute to NLA_ALIGNTO which would require extensive 493 * padding logic. Only perform zerocopy if padding is not required. 494 */ 495 if (dp->user_features & OVS_DP_F_UNALIGNED) 496 hlen = skb_zerocopy_headlen(skb); 497 else 498 hlen = skb->len; 499 500 len = upcall_msg_size(upcall_info, hlen - cutlen, 501 OVS_CB(skb)->acts_origlen); 502 user_skb = genlmsg_new(len, GFP_ATOMIC); 503 if (!user_skb) { 504 err = -ENOMEM; 505 goto out; 506 } 507 508 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 509 0, upcall_info->cmd); 510 if (!upcall) { 511 err = -EINVAL; 512 goto out; 513 } 514 upcall->dp_ifindex = dp_ifindex; 515 516 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); 517 if (err) 518 goto out; 519 520 if (upcall_info->userdata) 521 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 522 nla_len(upcall_info->userdata), 523 nla_data(upcall_info->userdata)); 524 525 if (upcall_info->egress_tun_info) { 526 nla = nla_nest_start_noflag(user_skb, 527 OVS_PACKET_ATTR_EGRESS_TUN_KEY); 528 if (!nla) { 529 err = -EMSGSIZE; 530 goto out; 531 } 532 err = ovs_nla_put_tunnel_info(user_skb, 533 upcall_info->egress_tun_info); 534 if (err) 535 goto out; 536 537 nla_nest_end(user_skb, nla); 538 } 539 540 if (upcall_info->actions_len) { 541 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS); 542 if (!nla) { 543 err = -EMSGSIZE; 544 goto out; 545 } 546 err = ovs_nla_put_actions(upcall_info->actions, 547 upcall_info->actions_len, 548 user_skb); 549 if (!err) 550 nla_nest_end(user_skb, nla); 551 else 552 nla_nest_cancel(user_skb, nla); 553 } 554 555 /* Add OVS_PACKET_ATTR_MRU */ 556 if (upcall_info->mru && 557 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) { 558 err = -ENOBUFS; 559 goto out; 560 } 561 562 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */ 563 if (cutlen > 0 && 564 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) { 565 err = -ENOBUFS; 566 goto out; 567 } 568 569 /* Add OVS_PACKET_ATTR_HASH */ 570 hash = skb_get_hash_raw(skb); 571 if (skb->sw_hash) 572 hash |= OVS_PACKET_HASH_SW_BIT; 573 574 if (skb->l4_hash) 575 hash |= OVS_PACKET_HASH_L4_BIT; 576 577 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) { 578 err = -ENOBUFS; 579 goto out; 580 } 581 582 /* Only reserve room for attribute header, packet data is added 583 * in skb_zerocopy() */ 584 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 585 err = -ENOBUFS; 586 goto out; 587 } 588 nla->nla_len = nla_attr_size(skb->len - cutlen); 589 590 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen); 591 if (err) 592 goto out; 593 594 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 595 pad_packet(dp, user_skb); 596 597 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 598 599 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 600 user_skb = NULL; 601 out: 602 if (err) 603 skb_tx_error(skb); 604 consume_skb(user_skb); 605 consume_skb(nskb); 606 607 return err; 608 } 609 610 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 611 { 612 struct ovs_header *ovs_header = genl_info_userhdr(info); 613 struct net *net = sock_net(skb->sk); 614 struct nlattr **a = info->attrs; 615 struct sw_flow_actions *acts; 616 struct sk_buff *packet; 617 struct sw_flow *flow; 618 struct sw_flow_actions *sf_acts; 619 struct datapath *dp; 620 struct vport *input_vport; 621 u16 mru = 0; 622 u64 hash; 623 int len; 624 int err; 625 bool log = !a[OVS_PACKET_ATTR_PROBE]; 626 627 err = -EINVAL; 628 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 629 !a[OVS_PACKET_ATTR_ACTIONS]) 630 goto err; 631 632 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 633 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 634 err = -ENOMEM; 635 if (!packet) 636 goto err; 637 skb_reserve(packet, NET_IP_ALIGN); 638 639 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 640 641 /* Set packet's mru */ 642 if (a[OVS_PACKET_ATTR_MRU]) { 643 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]); 644 packet->ignore_df = 1; 645 } 646 OVS_CB(packet)->mru = mru; 647 648 if (a[OVS_PACKET_ATTR_HASH]) { 649 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]); 650 651 __skb_set_hash(packet, hash & 0xFFFFFFFFULL, 652 !!(hash & OVS_PACKET_HASH_SW_BIT), 653 !!(hash & OVS_PACKET_HASH_L4_BIT)); 654 } 655 656 OVS_CB(packet)->upcall_pid = 657 nla_get_u32_default(a[OVS_PACKET_ATTR_UPCALL_PID], 0); 658 659 /* Build an sw_flow for sending this packet. */ 660 flow = ovs_flow_alloc(); 661 err = PTR_ERR(flow); 662 if (IS_ERR(flow)) 663 goto err_kfree_skb; 664 665 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY], 666 packet, &flow->key, log); 667 if (err) 668 goto err_flow_free; 669 670 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS], 671 &flow->key, &acts, log); 672 if (err) 673 goto err_flow_free; 674 675 rcu_assign_pointer(flow->sf_acts, acts); 676 packet->priority = flow->key.phy.priority; 677 packet->mark = flow->key.phy.skb_mark; 678 679 rcu_read_lock(); 680 dp = get_dp_rcu(net, ovs_header->dp_ifindex); 681 err = -ENODEV; 682 if (!dp) 683 goto err_unlock; 684 685 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 686 if (!input_vport) 687 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 688 689 if (!input_vport) 690 goto err_unlock; 691 692 packet->dev = input_vport->dev; 693 OVS_CB(packet)->input_vport = input_vport; 694 sf_acts = rcu_dereference(flow->sf_acts); 695 696 local_bh_disable(); 697 local_lock_nested_bh(&ovs_pcpu_storage->bh_lock); 698 if (IS_ENABLED(CONFIG_PREEMPT_RT)) 699 this_cpu_write(ovs_pcpu_storage->owner, current); 700 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); 701 if (IS_ENABLED(CONFIG_PREEMPT_RT)) 702 this_cpu_write(ovs_pcpu_storage->owner, NULL); 703 local_unlock_nested_bh(&ovs_pcpu_storage->bh_lock); 704 local_bh_enable(); 705 rcu_read_unlock(); 706 707 ovs_flow_free(flow, false); 708 return err; 709 710 err_unlock: 711 rcu_read_unlock(); 712 err_flow_free: 713 ovs_flow_free(flow, false); 714 err_kfree_skb: 715 kfree_skb(packet); 716 err: 717 return err; 718 } 719 720 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 721 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 722 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 723 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 724 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, 725 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, 726 [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 }, 727 [OVS_PACKET_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 728 }; 729 730 static const struct genl_small_ops dp_packet_genl_ops[] = { 731 { .cmd = OVS_PACKET_CMD_EXECUTE, 732 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 733 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 734 .doit = ovs_packet_cmd_execute 735 } 736 }; 737 738 static struct genl_family dp_packet_genl_family __ro_after_init = { 739 .hdrsize = sizeof(struct ovs_header), 740 .name = OVS_PACKET_FAMILY, 741 .version = OVS_PACKET_VERSION, 742 .maxattr = OVS_PACKET_ATTR_MAX, 743 .policy = packet_policy, 744 .netnsok = true, 745 .parallel_ops = true, 746 .small_ops = dp_packet_genl_ops, 747 .n_small_ops = ARRAY_SIZE(dp_packet_genl_ops), 748 .resv_start_op = OVS_PACKET_CMD_EXECUTE + 1, 749 .module = THIS_MODULE, 750 }; 751 752 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 753 struct ovs_dp_megaflow_stats *mega_stats) 754 { 755 int i; 756 757 memset(mega_stats, 0, sizeof(*mega_stats)); 758 759 stats->n_flows = ovs_flow_tbl_count(&dp->table); 760 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 761 762 stats->n_hit = stats->n_missed = stats->n_lost = 0; 763 764 for_each_possible_cpu(i) { 765 const struct dp_stats_percpu *percpu_stats; 766 struct dp_stats_percpu local_stats; 767 unsigned int start; 768 769 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 770 771 do { 772 start = u64_stats_fetch_begin(&percpu_stats->syncp); 773 local_stats = *percpu_stats; 774 } while (u64_stats_fetch_retry(&percpu_stats->syncp, start)); 775 776 stats->n_hit += local_stats.n_hit; 777 stats->n_missed += local_stats.n_missed; 778 stats->n_lost += local_stats.n_lost; 779 mega_stats->n_mask_hit += local_stats.n_mask_hit; 780 mega_stats->n_cache_hit += local_stats.n_cache_hit; 781 } 782 } 783 784 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) 785 { 786 return ovs_identifier_is_ufid(sfid) && 787 !(ufid_flags & OVS_UFID_F_OMIT_KEY); 788 } 789 790 static bool should_fill_mask(uint32_t ufid_flags) 791 { 792 return !(ufid_flags & OVS_UFID_F_OMIT_MASK); 793 } 794 795 static bool should_fill_actions(uint32_t ufid_flags) 796 { 797 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); 798 } 799 800 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, 801 const struct sw_flow_id *sfid, 802 uint32_t ufid_flags) 803 { 804 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); 805 806 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback 807 * see ovs_nla_put_identifier() 808 */ 809 if (sfid && ovs_identifier_is_ufid(sfid)) 810 len += nla_total_size(sfid->ufid_len); 811 else 812 len += nla_total_size(ovs_key_attr_size()); 813 814 /* OVS_FLOW_ATTR_KEY */ 815 if (!sfid || should_fill_key(sfid, ufid_flags)) 816 len += nla_total_size(ovs_key_attr_size()); 817 818 /* OVS_FLOW_ATTR_MASK */ 819 if (should_fill_mask(ufid_flags)) 820 len += nla_total_size(ovs_key_attr_size()); 821 822 /* OVS_FLOW_ATTR_ACTIONS */ 823 if (should_fill_actions(ufid_flags)) 824 len += nla_total_size(acts->orig_len); 825 826 return len 827 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 828 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 829 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */ 830 } 831 832 /* Called with ovs_mutex or RCU read lock. */ 833 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 834 struct sk_buff *skb) 835 { 836 struct ovs_flow_stats stats; 837 __be16 tcp_flags; 838 unsigned long used; 839 840 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 841 842 if (used && 843 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used), 844 OVS_FLOW_ATTR_PAD)) 845 return -EMSGSIZE; 846 847 if (stats.n_packets && 848 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS, 849 sizeof(struct ovs_flow_stats), &stats, 850 OVS_FLOW_ATTR_PAD)) 851 return -EMSGSIZE; 852 853 if ((u8)ntohs(tcp_flags) && 854 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 855 return -EMSGSIZE; 856 857 return 0; 858 } 859 860 /* Called with ovs_mutex or RCU read lock. */ 861 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 862 struct sk_buff *skb, int skb_orig_len) 863 { 864 struct nlattr *start; 865 int err; 866 867 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 868 * this is the first flow to be dumped into 'skb'. This is unusual for 869 * Netlink but individual action lists can be longer than 870 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 871 * The userspace caller can always fetch the actions separately if it 872 * really wants them. (Most userspace callers in fact don't care.) 873 * 874 * This can only fail for dump operations because the skb is always 875 * properly sized for single flows. 876 */ 877 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS); 878 if (start) { 879 const struct sw_flow_actions *sf_acts; 880 881 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 882 err = ovs_nla_put_actions(sf_acts->actions, 883 sf_acts->actions_len, skb); 884 885 if (!err) 886 nla_nest_end(skb, start); 887 else { 888 if (skb_orig_len) 889 return err; 890 891 nla_nest_cancel(skb, start); 892 } 893 } else if (skb_orig_len) { 894 return -EMSGSIZE; 895 } 896 897 return 0; 898 } 899 900 /* Called with ovs_mutex or RCU read lock. */ 901 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 902 struct sk_buff *skb, u32 portid, 903 u32 seq, u32 flags, u8 cmd, u32 ufid_flags) 904 { 905 const int skb_orig_len = skb->len; 906 struct ovs_header *ovs_header; 907 int err; 908 909 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 910 flags, cmd); 911 if (!ovs_header) 912 return -EMSGSIZE; 913 914 ovs_header->dp_ifindex = dp_ifindex; 915 916 err = ovs_nla_put_identifier(flow, skb); 917 if (err) 918 goto error; 919 920 if (should_fill_key(&flow->id, ufid_flags)) { 921 err = ovs_nla_put_masked_key(flow, skb); 922 if (err) 923 goto error; 924 } 925 926 if (should_fill_mask(ufid_flags)) { 927 err = ovs_nla_put_mask(flow, skb); 928 if (err) 929 goto error; 930 } 931 932 err = ovs_flow_cmd_fill_stats(flow, skb); 933 if (err) 934 goto error; 935 936 if (should_fill_actions(ufid_flags)) { 937 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 938 if (err) 939 goto error; 940 } 941 942 genlmsg_end(skb, ovs_header); 943 return 0; 944 945 error: 946 genlmsg_cancel(skb, ovs_header); 947 return err; 948 } 949 950 /* May not be called with RCU read lock. */ 951 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 952 const struct sw_flow_id *sfid, 953 struct genl_info *info, 954 bool always, 955 uint32_t ufid_flags) 956 { 957 struct sk_buff *skb; 958 size_t len; 959 960 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 961 return NULL; 962 963 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); 964 skb = genlmsg_new(len, GFP_KERNEL); 965 if (!skb) 966 return ERR_PTR(-ENOMEM); 967 968 return skb; 969 } 970 971 /* Called with ovs_mutex. */ 972 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 973 int dp_ifindex, 974 struct genl_info *info, u8 cmd, 975 bool always, u32 ufid_flags) 976 { 977 struct sk_buff *skb; 978 int retval; 979 980 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), 981 &flow->id, info, always, ufid_flags); 982 if (IS_ERR_OR_NULL(skb)) 983 return skb; 984 985 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 986 info->snd_portid, info->snd_seq, 0, 987 cmd, ufid_flags); 988 if (WARN_ON_ONCE(retval < 0)) { 989 kfree_skb(skb); 990 skb = ERR_PTR(retval); 991 } 992 return skb; 993 } 994 995 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 996 { 997 struct net *net = sock_net(skb->sk); 998 struct nlattr **a = info->attrs; 999 struct ovs_header *ovs_header = genl_info_userhdr(info); 1000 struct sw_flow *flow = NULL, *new_flow; 1001 struct sw_flow_mask mask; 1002 struct sk_buff *reply; 1003 struct datapath *dp; 1004 struct sw_flow_key *key; 1005 struct sw_flow_actions *acts; 1006 struct sw_flow_match match; 1007 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1008 int error; 1009 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1010 1011 /* Must have key and actions. */ 1012 error = -EINVAL; 1013 if (!a[OVS_FLOW_ATTR_KEY]) { 1014 OVS_NLERR(log, "Flow key attr not present in new flow."); 1015 goto error; 1016 } 1017 if (!a[OVS_FLOW_ATTR_ACTIONS]) { 1018 OVS_NLERR(log, "Flow actions attr not present in new flow."); 1019 goto error; 1020 } 1021 1022 /* Most of the time we need to allocate a new flow, do it before 1023 * locking. 1024 */ 1025 new_flow = ovs_flow_alloc(); 1026 if (IS_ERR(new_flow)) { 1027 error = PTR_ERR(new_flow); 1028 goto error; 1029 } 1030 1031 /* Extract key. */ 1032 key = kzalloc_obj(*key, GFP_KERNEL); 1033 if (!key) { 1034 error = -ENOMEM; 1035 goto err_kfree_flow; 1036 } 1037 1038 ovs_match_init(&match, key, false, &mask); 1039 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1040 a[OVS_FLOW_ATTR_MASK], log); 1041 if (error) 1042 goto err_kfree_key; 1043 1044 ovs_flow_mask_key(&new_flow->key, key, true, &mask); 1045 1046 /* Extract flow identifier. */ 1047 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID], 1048 key, log); 1049 if (error) 1050 goto err_kfree_key; 1051 1052 /* Validate actions. */ 1053 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS], 1054 &new_flow->key, &acts, log); 1055 if (error) { 1056 OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); 1057 goto err_kfree_key; 1058 } 1059 1060 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false, 1061 ufid_flags); 1062 if (IS_ERR(reply)) { 1063 error = PTR_ERR(reply); 1064 goto err_kfree_acts; 1065 } 1066 1067 ovs_lock(); 1068 dp = get_dp(net, ovs_header->dp_ifindex); 1069 if (unlikely(!dp)) { 1070 error = -ENODEV; 1071 goto err_unlock_ovs; 1072 } 1073 1074 /* Check if this is a duplicate flow */ 1075 if (ovs_identifier_is_ufid(&new_flow->id)) 1076 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id); 1077 if (!flow) 1078 flow = ovs_flow_tbl_lookup(&dp->table, key); 1079 if (likely(!flow)) { 1080 rcu_assign_pointer(new_flow->sf_acts, acts); 1081 1082 /* Put flow in bucket. */ 1083 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 1084 if (unlikely(error)) { 1085 acts = NULL; 1086 goto err_unlock_ovs; 1087 } 1088 1089 if (unlikely(reply)) { 1090 error = ovs_flow_cmd_fill_info(new_flow, 1091 ovs_header->dp_ifindex, 1092 reply, info->snd_portid, 1093 info->snd_seq, 0, 1094 OVS_FLOW_CMD_NEW, 1095 ufid_flags); 1096 BUG_ON(error < 0); 1097 } 1098 ovs_unlock(); 1099 } else { 1100 struct sw_flow_actions *old_acts; 1101 1102 /* Bail out if we're not allowed to modify an existing flow. 1103 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 1104 * because Generic Netlink treats the latter as a dump 1105 * request. We also accept NLM_F_EXCL in case that bug ever 1106 * gets fixed. 1107 */ 1108 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 1109 | NLM_F_EXCL))) { 1110 error = -EEXIST; 1111 goto err_unlock_ovs; 1112 } 1113 /* The flow identifier has to be the same for flow updates. 1114 * Look for any overlapping flow. 1115 */ 1116 if (unlikely(!ovs_flow_cmp(flow, &match))) { 1117 if (ovs_identifier_is_key(&flow->id)) 1118 flow = ovs_flow_tbl_lookup_exact(&dp->table, 1119 &match); 1120 else /* UFID matches but key is different */ 1121 flow = NULL; 1122 if (!flow) { 1123 error = -ENOENT; 1124 goto err_unlock_ovs; 1125 } 1126 } 1127 /* Update actions. */ 1128 old_acts = ovsl_dereference(flow->sf_acts); 1129 rcu_assign_pointer(flow->sf_acts, acts); 1130 1131 if (unlikely(reply)) { 1132 error = ovs_flow_cmd_fill_info(flow, 1133 ovs_header->dp_ifindex, 1134 reply, info->snd_portid, 1135 info->snd_seq, 0, 1136 OVS_FLOW_CMD_NEW, 1137 ufid_flags); 1138 BUG_ON(error < 0); 1139 } 1140 ovs_unlock(); 1141 1142 ovs_nla_free_flow_actions_rcu(old_acts); 1143 ovs_flow_free(new_flow, false); 1144 } 1145 1146 if (reply) 1147 ovs_notify(&dp_flow_genl_family, reply, info); 1148 1149 kfree(key); 1150 return 0; 1151 1152 err_unlock_ovs: 1153 ovs_unlock(); 1154 kfree_skb(reply); 1155 err_kfree_acts: 1156 ovs_nla_free_flow_actions(acts); 1157 err_kfree_key: 1158 kfree(key); 1159 err_kfree_flow: 1160 ovs_flow_free(new_flow, false); 1161 error: 1162 return error; 1163 } 1164 1165 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ 1166 static noinline_for_stack 1167 struct sw_flow_actions *get_flow_actions(struct net *net, 1168 const struct nlattr *a, 1169 const struct sw_flow_key *key, 1170 const struct sw_flow_mask *mask, 1171 bool log) 1172 { 1173 struct sw_flow_actions *acts; 1174 struct sw_flow_key masked_key; 1175 int error; 1176 1177 ovs_flow_mask_key(&masked_key, key, true, mask); 1178 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log); 1179 if (error) { 1180 OVS_NLERR(log, 1181 "Actions may not be safe on all matching packets"); 1182 return ERR_PTR(error); 1183 } 1184 1185 return acts; 1186 } 1187 1188 /* Factor out match-init and action-copy to avoid 1189 * "Wframe-larger-than=1024" warning. Because mask is only 1190 * used to get actions, we new a function to save some 1191 * stack space. 1192 * 1193 * If there are not key and action attrs, we return 0 1194 * directly. In the case, the caller will also not use the 1195 * match as before. If there is action attr, we try to get 1196 * actions and save them to *acts. Before returning from 1197 * the function, we reset the match->mask pointer. Because 1198 * we should not to return match object with dangling reference 1199 * to mask. 1200 * */ 1201 static noinline_for_stack int 1202 ovs_nla_init_match_and_action(struct net *net, 1203 struct sw_flow_match *match, 1204 struct sw_flow_key *key, 1205 struct nlattr **a, 1206 struct sw_flow_actions **acts, 1207 bool log) 1208 { 1209 struct sw_flow_mask mask; 1210 int error = 0; 1211 1212 if (a[OVS_FLOW_ATTR_KEY]) { 1213 ovs_match_init(match, key, true, &mask); 1214 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY], 1215 a[OVS_FLOW_ATTR_MASK], log); 1216 if (error) 1217 goto error; 1218 } 1219 1220 if (a[OVS_FLOW_ATTR_ACTIONS]) { 1221 if (!a[OVS_FLOW_ATTR_KEY]) { 1222 OVS_NLERR(log, 1223 "Flow key attribute not present in set flow."); 1224 error = -EINVAL; 1225 goto error; 1226 } 1227 1228 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key, 1229 &mask, log); 1230 if (IS_ERR(*acts)) { 1231 error = PTR_ERR(*acts); 1232 goto error; 1233 } 1234 } 1235 1236 /* On success, error is 0. */ 1237 error: 1238 match->mask = NULL; 1239 return error; 1240 } 1241 1242 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 1243 { 1244 struct net *net = sock_net(skb->sk); 1245 struct nlattr **a = info->attrs; 1246 struct ovs_header *ovs_header = genl_info_userhdr(info); 1247 struct sw_flow_key key; 1248 struct sw_flow *flow; 1249 struct sk_buff *reply = NULL; 1250 struct datapath *dp; 1251 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 1252 struct sw_flow_match match; 1253 struct sw_flow_id sfid; 1254 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1255 int error = 0; 1256 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1257 bool ufid_present; 1258 1259 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); 1260 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) { 1261 OVS_NLERR(log, 1262 "Flow set message rejected, Key attribute missing."); 1263 return -EINVAL; 1264 } 1265 1266 error = ovs_nla_init_match_and_action(net, &match, &key, a, 1267 &acts, log); 1268 if (error) 1269 goto error; 1270 1271 if (acts) { 1272 /* Can allocate before locking if have acts. */ 1273 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false, 1274 ufid_flags); 1275 if (IS_ERR(reply)) { 1276 error = PTR_ERR(reply); 1277 goto err_kfree_acts; 1278 } 1279 } 1280 1281 ovs_lock(); 1282 dp = get_dp(net, ovs_header->dp_ifindex); 1283 if (unlikely(!dp)) { 1284 error = -ENODEV; 1285 goto err_unlock_ovs; 1286 } 1287 /* Check that the flow exists. */ 1288 if (ufid_present) 1289 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid); 1290 else 1291 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1292 if (unlikely(!flow)) { 1293 error = -ENOENT; 1294 goto err_unlock_ovs; 1295 } 1296 1297 /* Update actions, if present. */ 1298 if (likely(acts)) { 1299 old_acts = ovsl_dereference(flow->sf_acts); 1300 rcu_assign_pointer(flow->sf_acts, acts); 1301 1302 if (unlikely(reply)) { 1303 error = ovs_flow_cmd_fill_info(flow, 1304 ovs_header->dp_ifindex, 1305 reply, info->snd_portid, 1306 info->snd_seq, 0, 1307 OVS_FLOW_CMD_SET, 1308 ufid_flags); 1309 BUG_ON(error < 0); 1310 } 1311 } else { 1312 /* Could not alloc without acts before locking. */ 1313 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1314 info, OVS_FLOW_CMD_SET, false, 1315 ufid_flags); 1316 1317 if (IS_ERR(reply)) { 1318 error = PTR_ERR(reply); 1319 goto err_unlock_ovs; 1320 } 1321 } 1322 1323 /* Clear stats. */ 1324 if (a[OVS_FLOW_ATTR_CLEAR]) 1325 ovs_flow_stats_clear(flow); 1326 ovs_unlock(); 1327 1328 if (reply) 1329 ovs_notify(&dp_flow_genl_family, reply, info); 1330 if (old_acts) 1331 ovs_nla_free_flow_actions_rcu(old_acts); 1332 1333 return 0; 1334 1335 err_unlock_ovs: 1336 ovs_unlock(); 1337 kfree_skb(reply); 1338 err_kfree_acts: 1339 ovs_nla_free_flow_actions(acts); 1340 error: 1341 return error; 1342 } 1343 1344 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1345 { 1346 struct nlattr **a = info->attrs; 1347 struct ovs_header *ovs_header = genl_info_userhdr(info); 1348 struct net *net = sock_net(skb->sk); 1349 struct sw_flow_key key; 1350 struct sk_buff *reply; 1351 struct sw_flow *flow; 1352 struct datapath *dp; 1353 struct sw_flow_match match; 1354 struct sw_flow_id ufid; 1355 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1356 int err = 0; 1357 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1358 bool ufid_present; 1359 1360 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1361 if (a[OVS_FLOW_ATTR_KEY]) { 1362 ovs_match_init(&match, &key, true, NULL); 1363 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL, 1364 log); 1365 } else if (!ufid_present) { 1366 OVS_NLERR(log, 1367 "Flow get message rejected, Key attribute missing."); 1368 err = -EINVAL; 1369 } 1370 if (err) 1371 return err; 1372 1373 ovs_lock(); 1374 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1375 if (!dp) { 1376 err = -ENODEV; 1377 goto unlock; 1378 } 1379 1380 if (ufid_present) 1381 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1382 else 1383 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1384 if (!flow) { 1385 err = -ENOENT; 1386 goto unlock; 1387 } 1388 1389 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1390 OVS_FLOW_CMD_GET, true, ufid_flags); 1391 if (IS_ERR(reply)) { 1392 err = PTR_ERR(reply); 1393 goto unlock; 1394 } 1395 1396 ovs_unlock(); 1397 return genlmsg_reply(reply, info); 1398 unlock: 1399 ovs_unlock(); 1400 return err; 1401 } 1402 1403 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1404 { 1405 struct nlattr **a = info->attrs; 1406 struct ovs_header *ovs_header = genl_info_userhdr(info); 1407 struct net *net = sock_net(skb->sk); 1408 struct sw_flow_key key; 1409 struct sk_buff *reply; 1410 struct sw_flow *flow = NULL; 1411 struct datapath *dp; 1412 struct sw_flow_match match; 1413 struct sw_flow_id ufid; 1414 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1415 int err; 1416 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1417 bool ufid_present; 1418 1419 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1420 if (a[OVS_FLOW_ATTR_KEY]) { 1421 ovs_match_init(&match, &key, true, NULL); 1422 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1423 NULL, log); 1424 if (unlikely(err)) 1425 return err; 1426 } 1427 1428 ovs_lock(); 1429 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1430 if (unlikely(!dp)) { 1431 err = -ENODEV; 1432 goto unlock; 1433 } 1434 1435 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) { 1436 err = ovs_flow_tbl_flush(&dp->table); 1437 goto unlock; 1438 } 1439 1440 if (ufid_present) 1441 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1442 else 1443 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1444 if (unlikely(!flow)) { 1445 err = -ENOENT; 1446 goto unlock; 1447 } 1448 1449 ovs_flow_tbl_remove(&dp->table, flow); 1450 ovs_unlock(); 1451 1452 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1453 &flow->id, info, false, ufid_flags); 1454 if (likely(reply)) { 1455 if (!IS_ERR(reply)) { 1456 rcu_read_lock(); /*To keep RCU checker happy. */ 1457 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1458 reply, info->snd_portid, 1459 info->snd_seq, 0, 1460 OVS_FLOW_CMD_DEL, 1461 ufid_flags); 1462 rcu_read_unlock(); 1463 if (WARN_ON_ONCE(err < 0)) { 1464 kfree_skb(reply); 1465 goto out_free; 1466 } 1467 1468 ovs_notify(&dp_flow_genl_family, reply, info); 1469 } else { 1470 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, 1471 PTR_ERR(reply)); 1472 } 1473 } 1474 1475 out_free: 1476 ovs_flow_free(flow, true); 1477 return 0; 1478 unlock: 1479 ovs_unlock(); 1480 return err; 1481 } 1482 1483 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1484 { 1485 struct nlattr *a[__OVS_FLOW_ATTR_MAX]; 1486 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1487 struct table_instance *ti; 1488 struct datapath *dp; 1489 u32 ufid_flags; 1490 int err; 1491 1492 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a, 1493 OVS_FLOW_ATTR_MAX, flow_policy, NULL); 1494 if (err) 1495 return err; 1496 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1497 1498 rcu_read_lock(); 1499 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1500 if (!dp) { 1501 rcu_read_unlock(); 1502 return -ENODEV; 1503 } 1504 1505 ti = rcu_dereference(dp->table.ti); 1506 for (;;) { 1507 struct sw_flow *flow; 1508 u32 bucket, obj; 1509 1510 bucket = cb->args[0]; 1511 obj = cb->args[1]; 1512 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1513 if (!flow) 1514 break; 1515 1516 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1517 NETLINK_CB(cb->skb).portid, 1518 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1519 OVS_FLOW_CMD_GET, ufid_flags) < 0) 1520 break; 1521 1522 cb->args[0] = bucket; 1523 cb->args[1] = obj; 1524 } 1525 rcu_read_unlock(); 1526 return skb->len; 1527 } 1528 1529 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1530 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1531 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1532 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1533 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1534 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1535 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, 1536 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, 1537 }; 1538 1539 static const struct genl_small_ops dp_flow_genl_ops[] = { 1540 { .cmd = OVS_FLOW_CMD_NEW, 1541 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1542 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1543 .doit = ovs_flow_cmd_new 1544 }, 1545 { .cmd = OVS_FLOW_CMD_DEL, 1546 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1547 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1548 .doit = ovs_flow_cmd_del 1549 }, 1550 { .cmd = OVS_FLOW_CMD_GET, 1551 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1552 .flags = 0, /* OK for unprivileged users. */ 1553 .doit = ovs_flow_cmd_get, 1554 .dumpit = ovs_flow_cmd_dump 1555 }, 1556 { .cmd = OVS_FLOW_CMD_SET, 1557 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1558 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1559 .doit = ovs_flow_cmd_set, 1560 }, 1561 }; 1562 1563 static struct genl_family dp_flow_genl_family __ro_after_init = { 1564 .hdrsize = sizeof(struct ovs_header), 1565 .name = OVS_FLOW_FAMILY, 1566 .version = OVS_FLOW_VERSION, 1567 .maxattr = OVS_FLOW_ATTR_MAX, 1568 .policy = flow_policy, 1569 .netnsok = true, 1570 .parallel_ops = true, 1571 .small_ops = dp_flow_genl_ops, 1572 .n_small_ops = ARRAY_SIZE(dp_flow_genl_ops), 1573 .resv_start_op = OVS_FLOW_CMD_SET + 1, 1574 .mcgrps = &ovs_dp_flow_multicast_group, 1575 .n_mcgrps = 1, 1576 .module = THIS_MODULE, 1577 }; 1578 1579 static size_t ovs_dp_cmd_msg_size(void) 1580 { 1581 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1582 1583 msgsize += nla_total_size(IFNAMSIZ); 1584 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats)); 1585 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats)); 1586 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1587 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */ 1588 msgsize += nla_total_size(sizeof(u32) * nr_cpu_ids); /* OVS_DP_ATTR_PER_CPU_PIDS */ 1589 1590 return msgsize; 1591 } 1592 1593 /* Called with ovs_mutex. */ 1594 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1595 u32 portid, u32 seq, u32 flags, u8 cmd) 1596 { 1597 struct ovs_header *ovs_header; 1598 struct ovs_dp_stats dp_stats; 1599 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1600 struct dp_nlsk_pids *pids = ovsl_dereference(dp->upcall_portids); 1601 int err, pids_len; 1602 1603 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1604 flags, cmd); 1605 if (!ovs_header) 1606 goto error; 1607 1608 ovs_header->dp_ifindex = get_dpifindex(dp); 1609 1610 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1611 if (err) 1612 goto nla_put_failure; 1613 1614 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1615 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1616 &dp_stats, OVS_DP_ATTR_PAD)) 1617 goto nla_put_failure; 1618 1619 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1620 sizeof(struct ovs_dp_megaflow_stats), 1621 &dp_megaflow_stats, OVS_DP_ATTR_PAD)) 1622 goto nla_put_failure; 1623 1624 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1625 goto nla_put_failure; 1626 1627 if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE, 1628 ovs_flow_tbl_masks_cache_size(&dp->table))) 1629 goto nla_put_failure; 1630 1631 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU && pids) { 1632 pids_len = min(pids->n_pids, nr_cpu_ids) * sizeof(u32); 1633 if (nla_put(skb, OVS_DP_ATTR_PER_CPU_PIDS, pids_len, &pids->pids)) 1634 goto nla_put_failure; 1635 } 1636 1637 genlmsg_end(skb, ovs_header); 1638 return 0; 1639 1640 nla_put_failure: 1641 genlmsg_cancel(skb, ovs_header); 1642 error: 1643 return -EMSGSIZE; 1644 } 1645 1646 static struct sk_buff *ovs_dp_cmd_alloc_info(void) 1647 { 1648 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL); 1649 } 1650 1651 /* Called with rcu_read_lock or ovs_mutex. */ 1652 static struct datapath *lookup_datapath(struct net *net, 1653 const struct ovs_header *ovs_header, 1654 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1655 { 1656 struct datapath *dp; 1657 1658 if (!a[OVS_DP_ATTR_NAME]) 1659 dp = get_dp(net, ovs_header->dp_ifindex); 1660 else { 1661 struct vport *vport; 1662 1663 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1664 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1665 } 1666 return dp ? dp : ERR_PTR(-ENODEV); 1667 } 1668 1669 static void ovs_dp_reset_user_features(struct sk_buff *skb, 1670 struct genl_info *info) 1671 { 1672 struct datapath *dp; 1673 1674 dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info), 1675 info->attrs); 1676 if (IS_ERR(dp)) 1677 return; 1678 1679 pr_warn("%s: Dropping previously announced user features\n", 1680 ovs_dp_name(dp)); 1681 dp->user_features = 0; 1682 } 1683 1684 static int ovs_dp_set_upcall_portids(struct datapath *dp, 1685 const struct nlattr *ids) 1686 { 1687 struct dp_nlsk_pids *old, *dp_nlsk_pids; 1688 1689 if (!nla_len(ids) || nla_len(ids) % sizeof(u32)) 1690 return -EINVAL; 1691 1692 old = ovsl_dereference(dp->upcall_portids); 1693 1694 dp_nlsk_pids = kmalloc(sizeof(*dp_nlsk_pids) + nla_len(ids), 1695 GFP_KERNEL); 1696 if (!dp_nlsk_pids) 1697 return -ENOMEM; 1698 1699 dp_nlsk_pids->n_pids = nla_len(ids) / sizeof(u32); 1700 nla_memcpy(dp_nlsk_pids->pids, ids, nla_len(ids)); 1701 1702 rcu_assign_pointer(dp->upcall_portids, dp_nlsk_pids); 1703 1704 kfree_rcu(old, rcu); 1705 1706 return 0; 1707 } 1708 1709 u32 ovs_dp_get_upcall_portid(const struct datapath *dp, uint32_t cpu_id) 1710 { 1711 struct dp_nlsk_pids *dp_nlsk_pids; 1712 1713 dp_nlsk_pids = rcu_dereference(dp->upcall_portids); 1714 1715 if (dp_nlsk_pids) { 1716 if (cpu_id < dp_nlsk_pids->n_pids) { 1717 return dp_nlsk_pids->pids[cpu_id]; 1718 } else if (dp_nlsk_pids->n_pids > 0 && 1719 cpu_id >= dp_nlsk_pids->n_pids) { 1720 /* If the number of netlink PIDs is mismatched with 1721 * the number of CPUs as seen by the kernel, log this 1722 * and send the upcall to an arbitrary socket (0) in 1723 * order to not drop packets 1724 */ 1725 pr_info_ratelimited("cpu_id mismatch with handler threads"); 1726 return dp_nlsk_pids->pids[cpu_id % 1727 dp_nlsk_pids->n_pids]; 1728 } else { 1729 return 0; 1730 } 1731 } else { 1732 return 0; 1733 } 1734 } 1735 1736 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1737 { 1738 u32 user_features = 0, old_features = dp->user_features; 1739 int err; 1740 1741 if (a[OVS_DP_ATTR_USER_FEATURES]) { 1742 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1743 1744 if (user_features & ~(OVS_DP_F_VPORT_PIDS | 1745 OVS_DP_F_UNALIGNED | 1746 OVS_DP_F_TC_RECIRC_SHARING | 1747 OVS_DP_F_DISPATCH_UPCALL_PER_CPU)) 1748 return -EOPNOTSUPP; 1749 1750 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT) 1751 if (user_features & OVS_DP_F_TC_RECIRC_SHARING) 1752 return -EOPNOTSUPP; 1753 #endif 1754 } 1755 1756 if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) { 1757 int err; 1758 u32 cache_size; 1759 1760 cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]); 1761 err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size); 1762 if (err) 1763 return err; 1764 } 1765 1766 dp->user_features = user_features; 1767 1768 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU && 1769 a[OVS_DP_ATTR_PER_CPU_PIDS]) { 1770 /* Upcall Netlink Port IDs have been updated */ 1771 err = ovs_dp_set_upcall_portids(dp, 1772 a[OVS_DP_ATTR_PER_CPU_PIDS]); 1773 if (err) 1774 return err; 1775 } 1776 1777 if ((dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) && 1778 !(old_features & OVS_DP_F_TC_RECIRC_SHARING)) 1779 tc_skb_ext_tc_enable(); 1780 else if (!(dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) && 1781 (old_features & OVS_DP_F_TC_RECIRC_SHARING)) 1782 tc_skb_ext_tc_disable(); 1783 1784 return 0; 1785 } 1786 1787 static int ovs_dp_stats_init(struct datapath *dp) 1788 { 1789 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1790 if (!dp->stats_percpu) 1791 return -ENOMEM; 1792 1793 return 0; 1794 } 1795 1796 static int ovs_dp_vport_init(struct datapath *dp) 1797 { 1798 int i; 1799 1800 dp->ports = kmalloc_objs(struct hlist_head, DP_VPORT_HASH_BUCKETS, 1801 GFP_KERNEL); 1802 if (!dp->ports) 1803 return -ENOMEM; 1804 1805 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1806 INIT_HLIST_HEAD(&dp->ports[i]); 1807 1808 return 0; 1809 } 1810 1811 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1812 { 1813 struct nlattr **a = info->attrs; 1814 struct vport_parms parms; 1815 struct sk_buff *reply; 1816 struct datapath *dp; 1817 struct vport *vport; 1818 struct ovs_net *ovs_net; 1819 int err; 1820 1821 err = -EINVAL; 1822 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1823 goto err; 1824 1825 reply = ovs_dp_cmd_alloc_info(); 1826 if (!reply) 1827 return -ENOMEM; 1828 1829 err = -ENOMEM; 1830 dp = kzalloc_obj(*dp, GFP_KERNEL); 1831 if (dp == NULL) 1832 goto err_destroy_reply; 1833 1834 ovs_dp_set_net(dp, sock_net(skb->sk)); 1835 1836 /* Allocate table. */ 1837 err = ovs_flow_tbl_init(&dp->table); 1838 if (err) 1839 goto err_destroy_dp; 1840 1841 err = ovs_dp_stats_init(dp); 1842 if (err) 1843 goto err_destroy_table; 1844 1845 err = ovs_dp_vport_init(dp); 1846 if (err) 1847 goto err_destroy_stats; 1848 1849 err = ovs_meters_init(dp); 1850 if (err) 1851 goto err_destroy_ports; 1852 1853 /* Set up our datapath device. */ 1854 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1855 parms.type = OVS_VPORT_TYPE_INTERNAL; 1856 parms.options = NULL; 1857 parms.dp = dp; 1858 parms.port_no = OVSP_LOCAL; 1859 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1860 parms.desired_ifindex = nla_get_s32_default(a[OVS_DP_ATTR_IFINDEX], 0); 1861 1862 /* So far only local changes have been made, now need the lock. */ 1863 ovs_lock(); 1864 1865 err = ovs_dp_change(dp, a); 1866 if (err) 1867 goto err_unlock_and_destroy_meters; 1868 1869 vport = new_vport(&parms); 1870 if (IS_ERR(vport)) { 1871 err = PTR_ERR(vport); 1872 if (err == -EBUSY) 1873 err = -EEXIST; 1874 1875 if (err == -EEXIST) { 1876 /* An outdated user space instance that does not understand 1877 * the concept of user_features has attempted to create a new 1878 * datapath and is likely to reuse it. Drop all user features. 1879 */ 1880 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1881 ovs_dp_reset_user_features(skb, info); 1882 } 1883 1884 goto err_destroy_portids; 1885 } 1886 1887 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1888 info->snd_seq, 0, OVS_DP_CMD_NEW); 1889 BUG_ON(err < 0); 1890 1891 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1892 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1893 1894 ovs_unlock(); 1895 1896 ovs_notify(&dp_datapath_genl_family, reply, info); 1897 return 0; 1898 1899 err_destroy_portids: 1900 kfree(rcu_dereference_raw(dp->upcall_portids)); 1901 err_unlock_and_destroy_meters: 1902 ovs_unlock(); 1903 ovs_meters_exit(dp); 1904 err_destroy_ports: 1905 kfree(dp->ports); 1906 err_destroy_stats: 1907 free_percpu(dp->stats_percpu); 1908 err_destroy_table: 1909 ovs_flow_tbl_destroy(&dp->table); 1910 err_destroy_dp: 1911 kfree(dp); 1912 err_destroy_reply: 1913 kfree_skb(reply); 1914 err: 1915 return err; 1916 } 1917 1918 /* Called with ovs_mutex. */ 1919 static void __dp_destroy(struct datapath *dp) 1920 { 1921 struct flow_table *table = &dp->table; 1922 int i; 1923 1924 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) 1925 tc_skb_ext_tc_disable(); 1926 1927 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1928 struct vport *vport; 1929 struct hlist_node *n; 1930 1931 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1932 if (vport->port_no != OVSP_LOCAL) 1933 ovs_dp_detach_port(vport); 1934 } 1935 1936 list_del_rcu(&dp->list_node); 1937 1938 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1939 * all ports in datapath are destroyed first before freeing datapath. 1940 */ 1941 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1942 1943 /* Flush sw_flow in the tables. RCU cb only releases resource 1944 * such as dp, ports and tables. That may avoid some issues 1945 * such as RCU usage warning. 1946 */ 1947 table_instance_flow_flush(table, ovsl_dereference(table->ti), 1948 ovsl_dereference(table->ufid_ti)); 1949 1950 /* RCU destroy the ports, meters and flow tables. */ 1951 call_rcu(&dp->rcu, destroy_dp_rcu); 1952 } 1953 1954 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1955 { 1956 struct sk_buff *reply; 1957 struct datapath *dp; 1958 int err; 1959 1960 reply = ovs_dp_cmd_alloc_info(); 1961 if (!reply) 1962 return -ENOMEM; 1963 1964 ovs_lock(); 1965 dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info), 1966 info->attrs); 1967 err = PTR_ERR(dp); 1968 if (IS_ERR(dp)) 1969 goto err_unlock_free; 1970 1971 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1972 info->snd_seq, 0, OVS_DP_CMD_DEL); 1973 BUG_ON(err < 0); 1974 1975 __dp_destroy(dp); 1976 ovs_unlock(); 1977 1978 ovs_notify(&dp_datapath_genl_family, reply, info); 1979 1980 return 0; 1981 1982 err_unlock_free: 1983 ovs_unlock(); 1984 kfree_skb(reply); 1985 return err; 1986 } 1987 1988 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1989 { 1990 struct sk_buff *reply; 1991 struct datapath *dp; 1992 int err; 1993 1994 reply = ovs_dp_cmd_alloc_info(); 1995 if (!reply) 1996 return -ENOMEM; 1997 1998 ovs_lock(); 1999 dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info), 2000 info->attrs); 2001 err = PTR_ERR(dp); 2002 if (IS_ERR(dp)) 2003 goto err_unlock_free; 2004 2005 err = ovs_dp_change(dp, info->attrs); 2006 if (err) 2007 goto err_unlock_free; 2008 2009 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 2010 info->snd_seq, 0, OVS_DP_CMD_SET); 2011 BUG_ON(err < 0); 2012 2013 ovs_unlock(); 2014 ovs_notify(&dp_datapath_genl_family, reply, info); 2015 2016 return 0; 2017 2018 err_unlock_free: 2019 ovs_unlock(); 2020 kfree_skb(reply); 2021 return err; 2022 } 2023 2024 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 2025 { 2026 struct sk_buff *reply; 2027 struct datapath *dp; 2028 int err; 2029 2030 reply = ovs_dp_cmd_alloc_info(); 2031 if (!reply) 2032 return -ENOMEM; 2033 2034 ovs_lock(); 2035 dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info), 2036 info->attrs); 2037 if (IS_ERR(dp)) { 2038 err = PTR_ERR(dp); 2039 goto err_unlock_free; 2040 } 2041 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 2042 info->snd_seq, 0, OVS_DP_CMD_GET); 2043 BUG_ON(err < 0); 2044 ovs_unlock(); 2045 2046 return genlmsg_reply(reply, info); 2047 2048 err_unlock_free: 2049 ovs_unlock(); 2050 kfree_skb(reply); 2051 return err; 2052 } 2053 2054 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2055 { 2056 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 2057 struct datapath *dp; 2058 int skip = cb->args[0]; 2059 int i = 0; 2060 2061 ovs_lock(); 2062 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2063 if (i >= skip && 2064 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 2065 cb->nlh->nlmsg_seq, NLM_F_MULTI, 2066 OVS_DP_CMD_GET) < 0) 2067 break; 2068 i++; 2069 } 2070 ovs_unlock(); 2071 2072 cb->args[0] = i; 2073 2074 return skb->len; 2075 } 2076 2077 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 2078 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2079 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 2080 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 2081 [OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0, 2082 PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)), 2083 [OVS_DP_ATTR_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 0), 2084 }; 2085 2086 static const struct genl_small_ops dp_datapath_genl_ops[] = { 2087 { .cmd = OVS_DP_CMD_NEW, 2088 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2089 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2090 .doit = ovs_dp_cmd_new 2091 }, 2092 { .cmd = OVS_DP_CMD_DEL, 2093 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2094 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2095 .doit = ovs_dp_cmd_del 2096 }, 2097 { .cmd = OVS_DP_CMD_GET, 2098 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2099 .flags = 0, /* OK for unprivileged users. */ 2100 .doit = ovs_dp_cmd_get, 2101 .dumpit = ovs_dp_cmd_dump 2102 }, 2103 { .cmd = OVS_DP_CMD_SET, 2104 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2105 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2106 .doit = ovs_dp_cmd_set, 2107 }, 2108 }; 2109 2110 static struct genl_family dp_datapath_genl_family __ro_after_init = { 2111 .hdrsize = sizeof(struct ovs_header), 2112 .name = OVS_DATAPATH_FAMILY, 2113 .version = OVS_DATAPATH_VERSION, 2114 .maxattr = OVS_DP_ATTR_MAX, 2115 .policy = datapath_policy, 2116 .netnsok = true, 2117 .parallel_ops = true, 2118 .small_ops = dp_datapath_genl_ops, 2119 .n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops), 2120 .resv_start_op = OVS_DP_CMD_SET + 1, 2121 .mcgrps = &ovs_dp_datapath_multicast_group, 2122 .n_mcgrps = 1, 2123 .module = THIS_MODULE, 2124 }; 2125 2126 /* Called with ovs_mutex or RCU read lock. */ 2127 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 2128 struct net *net, u32 portid, u32 seq, 2129 u32 flags, u8 cmd, gfp_t gfp) 2130 { 2131 struct ovs_header *ovs_header; 2132 struct ovs_vport_stats vport_stats; 2133 struct net *net_vport; 2134 int err; 2135 2136 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 2137 flags, cmd); 2138 if (!ovs_header) 2139 return -EMSGSIZE; 2140 2141 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 2142 2143 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 2144 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 2145 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 2146 ovs_vport_name(vport)) || 2147 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex)) 2148 goto nla_put_failure; 2149 2150 rcu_read_lock(); 2151 net_vport = dev_net_rcu(vport->dev); 2152 if (!net_eq(net, net_vport)) { 2153 int id = peernet2id_alloc(net, net_vport, GFP_ATOMIC); 2154 2155 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id)) 2156 goto nla_put_failure_unlock; 2157 } 2158 rcu_read_unlock(); 2159 2160 ovs_vport_get_stats(vport, &vport_stats); 2161 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS, 2162 sizeof(struct ovs_vport_stats), &vport_stats, 2163 OVS_VPORT_ATTR_PAD)) 2164 goto nla_put_failure; 2165 2166 if (ovs_vport_get_upcall_stats(vport, skb)) 2167 goto nla_put_failure; 2168 2169 if (ovs_vport_get_upcall_portids(vport, skb)) 2170 goto nla_put_failure; 2171 2172 err = ovs_vport_get_options(vport, skb); 2173 if (err == -EMSGSIZE) 2174 goto error; 2175 2176 genlmsg_end(skb, ovs_header); 2177 return 0; 2178 2179 nla_put_failure_unlock: 2180 rcu_read_unlock(); 2181 nla_put_failure: 2182 err = -EMSGSIZE; 2183 error: 2184 genlmsg_cancel(skb, ovs_header); 2185 return err; 2186 } 2187 2188 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 2189 { 2190 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2191 } 2192 2193 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 2194 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net, 2195 u32 portid, u32 seq, u8 cmd) 2196 { 2197 struct sk_buff *skb; 2198 int retval; 2199 2200 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2201 if (!skb) 2202 return ERR_PTR(-ENOMEM); 2203 2204 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd, 2205 GFP_KERNEL); 2206 BUG_ON(retval < 0); 2207 2208 return skb; 2209 } 2210 2211 /* Called with ovs_mutex or RCU read lock. */ 2212 static struct vport *lookup_vport(struct net *net, 2213 const struct ovs_header *ovs_header, 2214 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 2215 { 2216 struct datapath *dp; 2217 struct vport *vport; 2218 2219 if (a[OVS_VPORT_ATTR_IFINDEX]) 2220 return ERR_PTR(-EOPNOTSUPP); 2221 if (a[OVS_VPORT_ATTR_NAME]) { 2222 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 2223 if (!vport) 2224 return ERR_PTR(-ENODEV); 2225 if (ovs_header->dp_ifindex && 2226 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 2227 return ERR_PTR(-ENODEV); 2228 return vport; 2229 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 2230 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 2231 2232 if (port_no >= DP_MAX_PORTS) 2233 return ERR_PTR(-EFBIG); 2234 2235 dp = get_dp(net, ovs_header->dp_ifindex); 2236 if (!dp) 2237 return ERR_PTR(-ENODEV); 2238 2239 vport = ovs_vport_ovsl_rcu(dp, port_no); 2240 if (!vport) 2241 return ERR_PTR(-ENODEV); 2242 return vport; 2243 } else 2244 return ERR_PTR(-EINVAL); 2245 2246 } 2247 2248 static unsigned int ovs_get_max_headroom(struct datapath *dp) 2249 { 2250 unsigned int dev_headroom, max_headroom = 0; 2251 struct net_device *dev; 2252 struct vport *vport; 2253 int i; 2254 2255 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2256 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, 2257 lockdep_ovsl_is_held()) { 2258 dev = vport->dev; 2259 dev_headroom = netdev_get_fwd_headroom(dev); 2260 if (dev_headroom > max_headroom) 2261 max_headroom = dev_headroom; 2262 } 2263 } 2264 2265 return max_headroom; 2266 } 2267 2268 /* Called with ovs_mutex */ 2269 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom) 2270 { 2271 struct vport *vport; 2272 int i; 2273 2274 dp->max_headroom = new_headroom; 2275 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2276 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, 2277 lockdep_ovsl_is_held()) 2278 netdev_set_rx_headroom(vport->dev, new_headroom); 2279 } 2280 } 2281 2282 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 2283 { 2284 struct nlattr **a = info->attrs; 2285 struct ovs_header *ovs_header = genl_info_userhdr(info); 2286 struct vport_parms parms; 2287 struct sk_buff *reply; 2288 struct vport *vport; 2289 struct datapath *dp; 2290 unsigned int new_headroom; 2291 u32 port_no; 2292 int err; 2293 2294 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 2295 !a[OVS_VPORT_ATTR_UPCALL_PID]) 2296 return -EINVAL; 2297 2298 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 2299 2300 if (a[OVS_VPORT_ATTR_IFINDEX] && parms.type != OVS_VPORT_TYPE_INTERNAL) 2301 return -EOPNOTSUPP; 2302 2303 port_no = nla_get_u32_default(a[OVS_VPORT_ATTR_PORT_NO], 0); 2304 if (port_no >= DP_MAX_PORTS) 2305 return -EFBIG; 2306 2307 reply = ovs_vport_cmd_alloc_info(); 2308 if (!reply) 2309 return -ENOMEM; 2310 2311 ovs_lock(); 2312 restart: 2313 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 2314 err = -ENODEV; 2315 if (!dp) 2316 goto exit_unlock_free; 2317 2318 if (port_no) { 2319 vport = ovs_vport_ovsl(dp, port_no); 2320 err = -EBUSY; 2321 if (vport) 2322 goto exit_unlock_free; 2323 } else { 2324 for (port_no = 1; ; port_no++) { 2325 if (port_no >= DP_MAX_PORTS) { 2326 err = -EFBIG; 2327 goto exit_unlock_free; 2328 } 2329 vport = ovs_vport_ovsl(dp, port_no); 2330 if (!vport) 2331 break; 2332 } 2333 } 2334 2335 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 2336 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 2337 parms.dp = dp; 2338 parms.port_no = port_no; 2339 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2340 parms.desired_ifindex = nla_get_s32_default(a[OVS_VPORT_ATTR_IFINDEX], 2341 0); 2342 2343 vport = new_vport(&parms); 2344 err = PTR_ERR(vport); 2345 if (IS_ERR(vport)) { 2346 if (err == -EAGAIN) 2347 goto restart; 2348 goto exit_unlock_free; 2349 } 2350 2351 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2352 info->snd_portid, info->snd_seq, 0, 2353 OVS_VPORT_CMD_NEW, GFP_KERNEL); 2354 2355 new_headroom = netdev_get_fwd_headroom(vport->dev); 2356 2357 if (new_headroom > dp->max_headroom) 2358 ovs_update_headroom(dp, new_headroom); 2359 else 2360 netdev_set_rx_headroom(vport->dev, dp->max_headroom); 2361 2362 BUG_ON(err < 0); 2363 ovs_unlock(); 2364 2365 ovs_notify(&dp_vport_genl_family, reply, info); 2366 return 0; 2367 2368 exit_unlock_free: 2369 ovs_unlock(); 2370 kfree_skb(reply); 2371 return err; 2372 } 2373 2374 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 2375 { 2376 struct nlattr **a = info->attrs; 2377 struct sk_buff *reply; 2378 struct vport *vport; 2379 int err; 2380 2381 reply = ovs_vport_cmd_alloc_info(); 2382 if (!reply) 2383 return -ENOMEM; 2384 2385 ovs_lock(); 2386 vport = lookup_vport(sock_net(skb->sk), genl_info_userhdr(info), a); 2387 err = PTR_ERR(vport); 2388 if (IS_ERR(vport)) 2389 goto exit_unlock_free; 2390 2391 if (a[OVS_VPORT_ATTR_TYPE] && 2392 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 2393 err = -EINVAL; 2394 goto exit_unlock_free; 2395 } 2396 2397 if (a[OVS_VPORT_ATTR_OPTIONS]) { 2398 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 2399 if (err) 2400 goto exit_unlock_free; 2401 } 2402 2403 2404 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 2405 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2406 2407 err = ovs_vport_set_upcall_portids(vport, ids); 2408 if (err) 2409 goto exit_unlock_free; 2410 } 2411 2412 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2413 info->snd_portid, info->snd_seq, 0, 2414 OVS_VPORT_CMD_SET, GFP_KERNEL); 2415 BUG_ON(err < 0); 2416 2417 ovs_unlock(); 2418 ovs_notify(&dp_vport_genl_family, reply, info); 2419 return 0; 2420 2421 exit_unlock_free: 2422 ovs_unlock(); 2423 kfree_skb(reply); 2424 return err; 2425 } 2426 2427 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2428 { 2429 bool update_headroom = false; 2430 struct nlattr **a = info->attrs; 2431 struct sk_buff *reply; 2432 struct datapath *dp; 2433 struct vport *vport; 2434 unsigned int new_headroom; 2435 int err; 2436 2437 reply = ovs_vport_cmd_alloc_info(); 2438 if (!reply) 2439 return -ENOMEM; 2440 2441 ovs_lock(); 2442 vport = lookup_vport(sock_net(skb->sk), genl_info_userhdr(info), a); 2443 err = PTR_ERR(vport); 2444 if (IS_ERR(vport)) 2445 goto exit_unlock_free; 2446 2447 if (vport->port_no == OVSP_LOCAL) { 2448 err = -EINVAL; 2449 goto exit_unlock_free; 2450 } 2451 2452 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2453 info->snd_portid, info->snd_seq, 0, 2454 OVS_VPORT_CMD_DEL, GFP_KERNEL); 2455 BUG_ON(err < 0); 2456 2457 /* the vport deletion may trigger dp headroom update */ 2458 dp = vport->dp; 2459 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom) 2460 update_headroom = true; 2461 2462 netdev_reset_rx_headroom(vport->dev); 2463 ovs_dp_detach_port(vport); 2464 2465 if (update_headroom) { 2466 new_headroom = ovs_get_max_headroom(dp); 2467 2468 if (new_headroom < dp->max_headroom) 2469 ovs_update_headroom(dp, new_headroom); 2470 } 2471 ovs_unlock(); 2472 2473 ovs_notify(&dp_vport_genl_family, reply, info); 2474 return 0; 2475 2476 exit_unlock_free: 2477 ovs_unlock(); 2478 kfree_skb(reply); 2479 return err; 2480 } 2481 2482 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2483 { 2484 struct nlattr **a = info->attrs; 2485 struct ovs_header *ovs_header = genl_info_userhdr(info); 2486 struct sk_buff *reply; 2487 struct vport *vport; 2488 int err; 2489 2490 reply = ovs_vport_cmd_alloc_info(); 2491 if (!reply) 2492 return -ENOMEM; 2493 2494 rcu_read_lock(); 2495 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2496 err = PTR_ERR(vport); 2497 if (IS_ERR(vport)) 2498 goto exit_unlock_free; 2499 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2500 info->snd_portid, info->snd_seq, 0, 2501 OVS_VPORT_CMD_GET, GFP_ATOMIC); 2502 BUG_ON(err < 0); 2503 rcu_read_unlock(); 2504 2505 return genlmsg_reply(reply, info); 2506 2507 exit_unlock_free: 2508 rcu_read_unlock(); 2509 kfree_skb(reply); 2510 return err; 2511 } 2512 2513 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2514 { 2515 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2516 struct datapath *dp; 2517 int bucket = cb->args[0], skip = cb->args[1]; 2518 int i, j = 0; 2519 2520 rcu_read_lock(); 2521 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2522 if (!dp) { 2523 rcu_read_unlock(); 2524 return -ENODEV; 2525 } 2526 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2527 struct vport *vport; 2528 2529 j = 0; 2530 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2531 if (j >= skip && 2532 ovs_vport_cmd_fill_info(vport, skb, 2533 sock_net(skb->sk), 2534 NETLINK_CB(cb->skb).portid, 2535 cb->nlh->nlmsg_seq, 2536 NLM_F_MULTI, 2537 OVS_VPORT_CMD_GET, 2538 GFP_ATOMIC) < 0) 2539 goto out; 2540 2541 j++; 2542 } 2543 skip = 0; 2544 } 2545 out: 2546 rcu_read_unlock(); 2547 2548 cb->args[0] = i; 2549 cb->args[1] = j; 2550 2551 return skb->len; 2552 } 2553 2554 static void ovs_dp_masks_rebalance(struct work_struct *work) 2555 { 2556 struct ovs_net *ovs_net = container_of(work, struct ovs_net, 2557 masks_rebalance.work); 2558 struct datapath *dp; 2559 2560 ovs_lock(); 2561 2562 list_for_each_entry(dp, &ovs_net->dps, list_node) 2563 ovs_flow_masks_rebalance(&dp->table); 2564 2565 ovs_unlock(); 2566 2567 schedule_delayed_work(&ovs_net->masks_rebalance, 2568 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL)); 2569 } 2570 2571 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2572 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2573 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2574 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2575 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2576 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC }, 2577 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2578 [OVS_VPORT_ATTR_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 0), 2579 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 }, 2580 [OVS_VPORT_ATTR_UPCALL_STATS] = { .type = NLA_NESTED }, 2581 }; 2582 2583 static const struct genl_small_ops dp_vport_genl_ops[] = { 2584 { .cmd = OVS_VPORT_CMD_NEW, 2585 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2586 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2587 .doit = ovs_vport_cmd_new 2588 }, 2589 { .cmd = OVS_VPORT_CMD_DEL, 2590 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2591 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2592 .doit = ovs_vport_cmd_del 2593 }, 2594 { .cmd = OVS_VPORT_CMD_GET, 2595 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2596 .flags = 0, /* OK for unprivileged users. */ 2597 .doit = ovs_vport_cmd_get, 2598 .dumpit = ovs_vport_cmd_dump 2599 }, 2600 { .cmd = OVS_VPORT_CMD_SET, 2601 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2602 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2603 .doit = ovs_vport_cmd_set, 2604 }, 2605 }; 2606 2607 struct genl_family dp_vport_genl_family __ro_after_init = { 2608 .hdrsize = sizeof(struct ovs_header), 2609 .name = OVS_VPORT_FAMILY, 2610 .version = OVS_VPORT_VERSION, 2611 .maxattr = OVS_VPORT_ATTR_MAX, 2612 .policy = vport_policy, 2613 .netnsok = true, 2614 .parallel_ops = true, 2615 .small_ops = dp_vport_genl_ops, 2616 .n_small_ops = ARRAY_SIZE(dp_vport_genl_ops), 2617 .resv_start_op = OVS_VPORT_CMD_SET + 1, 2618 .mcgrps = &ovs_dp_vport_multicast_group, 2619 .n_mcgrps = 1, 2620 .module = THIS_MODULE, 2621 }; 2622 2623 static struct genl_family * const dp_genl_families[] = { 2624 &dp_datapath_genl_family, 2625 &dp_vport_genl_family, 2626 &dp_flow_genl_family, 2627 &dp_packet_genl_family, 2628 &dp_meter_genl_family, 2629 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 2630 &dp_ct_limit_genl_family, 2631 #endif 2632 }; 2633 2634 static void dp_unregister_genl(int n_families) 2635 { 2636 int i; 2637 2638 for (i = 0; i < n_families; i++) 2639 genl_unregister_family(dp_genl_families[i]); 2640 } 2641 2642 static int __init dp_register_genl(void) 2643 { 2644 int err; 2645 int i; 2646 2647 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2648 2649 err = genl_register_family(dp_genl_families[i]); 2650 if (err) 2651 goto error; 2652 } 2653 2654 return 0; 2655 2656 error: 2657 dp_unregister_genl(i); 2658 return err; 2659 } 2660 2661 static int __net_init ovs_init_net(struct net *net) 2662 { 2663 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2664 int err; 2665 2666 INIT_LIST_HEAD(&ovs_net->dps); 2667 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2668 INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance); 2669 2670 err = ovs_ct_init(net); 2671 if (err) 2672 return err; 2673 2674 schedule_delayed_work(&ovs_net->masks_rebalance, 2675 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL)); 2676 return 0; 2677 } 2678 2679 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2680 struct list_head *head) 2681 { 2682 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2683 struct datapath *dp; 2684 2685 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2686 int i; 2687 2688 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2689 struct vport *vport; 2690 2691 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2692 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2693 continue; 2694 2695 if (dev_net(vport->dev) == dnet) 2696 list_add(&vport->detach_list, head); 2697 } 2698 } 2699 } 2700 } 2701 2702 static void __net_exit ovs_exit_net(struct net *dnet) 2703 { 2704 struct datapath *dp, *dp_next; 2705 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2706 struct vport *vport, *vport_next; 2707 struct net *net; 2708 LIST_HEAD(head); 2709 2710 ovs_lock(); 2711 2712 ovs_ct_exit(dnet); 2713 2714 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2715 __dp_destroy(dp); 2716 2717 down_read(&net_rwsem); 2718 for_each_net(net) 2719 list_vports_from_net(net, dnet, &head); 2720 up_read(&net_rwsem); 2721 2722 /* Detach all vports from given namespace. */ 2723 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2724 list_del(&vport->detach_list); 2725 ovs_dp_detach_port(vport); 2726 } 2727 2728 ovs_unlock(); 2729 2730 cancel_delayed_work_sync(&ovs_net->masks_rebalance); 2731 cancel_work_sync(&ovs_net->dp_notify_work); 2732 } 2733 2734 static struct pernet_operations ovs_net_ops = { 2735 .init = ovs_init_net, 2736 .exit = ovs_exit_net, 2737 .id = &ovs_net_id, 2738 .size = sizeof(struct ovs_net), 2739 }; 2740 2741 static const char * const ovs_drop_reasons[] = { 2742 #define S(x) [(x) & ~SKB_DROP_REASON_SUBSYS_MASK] = (#x), 2743 OVS_DROP_REASONS(S) 2744 #undef S 2745 }; 2746 2747 static struct drop_reason_list drop_reason_list_ovs = { 2748 .reasons = ovs_drop_reasons, 2749 .n_reasons = ARRAY_SIZE(ovs_drop_reasons), 2750 }; 2751 2752 static int __init ovs_alloc_percpu_storage(void) 2753 { 2754 unsigned int cpu; 2755 2756 ovs_pcpu_storage = alloc_percpu(*ovs_pcpu_storage); 2757 if (!ovs_pcpu_storage) 2758 return -ENOMEM; 2759 2760 for_each_possible_cpu(cpu) { 2761 struct ovs_pcpu_storage *ovs_pcpu; 2762 2763 ovs_pcpu = per_cpu_ptr(ovs_pcpu_storage, cpu); 2764 local_lock_init(&ovs_pcpu->bh_lock); 2765 } 2766 return 0; 2767 } 2768 2769 static void ovs_free_percpu_storage(void) 2770 { 2771 free_percpu(ovs_pcpu_storage); 2772 } 2773 2774 static int __init dp_init(void) 2775 { 2776 int err; 2777 2778 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > 2779 sizeof_field(struct sk_buff, cb)); 2780 2781 pr_info("Open vSwitch switching datapath\n"); 2782 2783 err = ovs_alloc_percpu_storage(); 2784 if (err) 2785 goto error; 2786 2787 err = ovs_internal_dev_rtnl_link_register(); 2788 if (err) 2789 goto error; 2790 2791 err = ovs_flow_init(); 2792 if (err) 2793 goto error_unreg_rtnl_link; 2794 2795 err = ovs_vport_init(); 2796 if (err) 2797 goto error_flow_exit; 2798 2799 err = register_pernet_device(&ovs_net_ops); 2800 if (err) 2801 goto error_vport_exit; 2802 2803 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2804 if (err) 2805 goto error_netns_exit; 2806 2807 err = ovs_netdev_init(); 2808 if (err) 2809 goto error_unreg_notifier; 2810 2811 err = dp_register_genl(); 2812 if (err < 0) 2813 goto error_unreg_netdev; 2814 2815 drop_reasons_register_subsys(SKB_DROP_REASON_SUBSYS_OPENVSWITCH, 2816 &drop_reason_list_ovs); 2817 2818 return 0; 2819 2820 error_unreg_netdev: 2821 ovs_netdev_exit(); 2822 error_unreg_notifier: 2823 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2824 error_netns_exit: 2825 unregister_pernet_device(&ovs_net_ops); 2826 error_vport_exit: 2827 ovs_vport_exit(); 2828 error_flow_exit: 2829 ovs_flow_exit(); 2830 error_unreg_rtnl_link: 2831 ovs_internal_dev_rtnl_link_unregister(); 2832 error: 2833 ovs_free_percpu_storage(); 2834 return err; 2835 } 2836 2837 static void dp_cleanup(void) 2838 { 2839 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2840 ovs_netdev_exit(); 2841 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2842 unregister_pernet_device(&ovs_net_ops); 2843 drop_reasons_unregister_subsys(SKB_DROP_REASON_SUBSYS_OPENVSWITCH); 2844 rcu_barrier(); 2845 ovs_vport_exit(); 2846 ovs_flow_exit(); 2847 ovs_internal_dev_rtnl_link_unregister(); 2848 ovs_free_percpu_storage(); 2849 } 2850 2851 module_init(dp_init); 2852 module_exit(dp_cleanup); 2853 2854 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2855 MODULE_LICENSE("GPL"); 2856 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY); 2857 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY); 2858 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY); 2859 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY); 2860 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY); 2861 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY); 2862