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 const struct vport *p = OVS_CB(skb)->input_vport; 248 struct datapath *dp = p->dp; 249 struct sw_flow *flow; 250 struct sw_flow_actions *sf_acts; 251 struct dp_stats_percpu *stats; 252 u64 *stats_counter; 253 u32 n_mask_hit; 254 u32 n_cache_hit; 255 int error; 256 257 stats = this_cpu_ptr(dp->stats_percpu); 258 259 /* Look up flow. */ 260 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb), 261 &n_mask_hit, &n_cache_hit); 262 if (unlikely(!flow)) { 263 struct dp_upcall_info upcall; 264 265 memset(&upcall, 0, sizeof(upcall)); 266 upcall.cmd = OVS_PACKET_CMD_MISS; 267 268 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU) 269 upcall.portid = 270 ovs_dp_get_upcall_portid(dp, smp_processor_id()); 271 else 272 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 273 274 upcall.mru = OVS_CB(skb)->mru; 275 error = ovs_dp_upcall(dp, skb, key, &upcall, 0); 276 switch (error) { 277 case 0: 278 case -EAGAIN: 279 case -ERESTARTSYS: 280 case -EINTR: 281 consume_skb(skb); 282 break; 283 default: 284 kfree_skb(skb); 285 break; 286 } 287 stats_counter = &stats->n_missed; 288 goto out; 289 } 290 291 ovs_flow_stats_update(flow, key->tp.flags, skb); 292 sf_acts = rcu_dereference(flow->sf_acts); 293 error = ovs_execute_actions(dp, skb, sf_acts, key); 294 if (unlikely(error)) 295 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n", 296 ovs_dp_name(dp), error); 297 298 stats_counter = &stats->n_hit; 299 300 out: 301 /* Update datapath statistics. */ 302 u64_stats_update_begin(&stats->syncp); 303 (*stats_counter)++; 304 stats->n_mask_hit += n_mask_hit; 305 stats->n_cache_hit += n_cache_hit; 306 u64_stats_update_end(&stats->syncp); 307 } 308 309 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 310 const struct sw_flow_key *key, 311 const struct dp_upcall_info *upcall_info, 312 uint32_t cutlen) 313 { 314 struct dp_stats_percpu *stats; 315 int err; 316 317 if (trace_ovs_dp_upcall_enabled()) 318 trace_ovs_dp_upcall(dp, skb, key, upcall_info); 319 320 if (upcall_info->portid == 0) { 321 err = -ENOTCONN; 322 goto err; 323 } 324 325 if (!skb_is_gso(skb)) 326 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 327 else 328 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen); 329 330 ovs_vport_update_upcall_stats(skb, upcall_info, !err); 331 if (err) 332 goto err; 333 334 return 0; 335 336 err: 337 stats = this_cpu_ptr(dp->stats_percpu); 338 339 u64_stats_update_begin(&stats->syncp); 340 stats->n_lost++; 341 u64_stats_update_end(&stats->syncp); 342 343 return err; 344 } 345 346 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 347 const struct sw_flow_key *key, 348 const struct dp_upcall_info *upcall_info, 349 uint32_t cutlen) 350 { 351 unsigned int gso_type = skb_shinfo(skb)->gso_type; 352 struct sw_flow_key later_key; 353 struct sk_buff *segs, *nskb; 354 int err; 355 356 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET); 357 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 358 if (IS_ERR(segs)) 359 return PTR_ERR(segs); 360 if (segs == NULL) 361 return -EINVAL; 362 363 if (gso_type & SKB_GSO_UDP) { 364 /* The initial flow key extracted by ovs_flow_key_extract() 365 * in this case is for a first fragment, so we need to 366 * properly mark later fragments. 367 */ 368 later_key = *key; 369 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 370 } 371 372 /* Queue all of the segments. */ 373 skb_list_walk_safe(segs, skb, nskb) { 374 if (gso_type & SKB_GSO_UDP && skb != segs) 375 key = &later_key; 376 377 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 378 if (err) 379 break; 380 381 } 382 383 /* Free all of the segments. */ 384 skb_list_walk_safe(segs, skb, nskb) { 385 if (err) 386 kfree_skb(skb); 387 else 388 consume_skb(skb); 389 } 390 return err; 391 } 392 393 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, 394 unsigned int hdrlen, int actions_attrlen) 395 { 396 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 397 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 398 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */ 399 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */ 400 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */ 401 402 /* OVS_PACKET_ATTR_USERDATA */ 403 if (upcall_info->userdata) 404 size += NLA_ALIGN(upcall_info->userdata->nla_len); 405 406 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ 407 if (upcall_info->egress_tun_info) 408 size += nla_total_size(ovs_tun_key_attr_size()); 409 410 /* OVS_PACKET_ATTR_ACTIONS */ 411 if (upcall_info->actions_len) 412 size += nla_total_size(actions_attrlen); 413 414 /* OVS_PACKET_ATTR_MRU */ 415 if (upcall_info->mru) 416 size += nla_total_size(sizeof(upcall_info->mru)); 417 418 return size; 419 } 420 421 static void pad_packet(struct datapath *dp, struct sk_buff *skb) 422 { 423 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 424 size_t plen = NLA_ALIGN(skb->len) - skb->len; 425 426 if (plen > 0) 427 skb_put_zero(skb, plen); 428 } 429 } 430 431 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 432 const struct sw_flow_key *key, 433 const struct dp_upcall_info *upcall_info, 434 uint32_t cutlen) 435 { 436 struct ovs_header *upcall; 437 struct sk_buff *nskb = NULL; 438 struct sk_buff *user_skb = NULL; /* to be queued to userspace */ 439 struct nlattr *nla; 440 size_t len; 441 unsigned int hlen; 442 int err, dp_ifindex; 443 u64 hash; 444 445 dp_ifindex = get_dpifindex(dp); 446 if (!dp_ifindex) 447 return -ENODEV; 448 449 if (skb_vlan_tag_present(skb)) { 450 nskb = skb_clone(skb, GFP_ATOMIC); 451 if (!nskb) 452 return -ENOMEM; 453 454 nskb = __vlan_hwaccel_push_inside(nskb); 455 if (!nskb) 456 return -ENOMEM; 457 458 skb = nskb; 459 } 460 461 if (nla_attr_size(skb->len) > USHRT_MAX) { 462 err = -EFBIG; 463 goto out; 464 } 465 466 /* Complete checksum if needed */ 467 if (skb->ip_summed == CHECKSUM_PARTIAL && 468 (err = skb_csum_hwoffload_help(skb, 0))) 469 goto out; 470 471 /* Older versions of OVS user space enforce alignment of the last 472 * Netlink attribute to NLA_ALIGNTO which would require extensive 473 * padding logic. Only perform zerocopy if padding is not required. 474 */ 475 if (dp->user_features & OVS_DP_F_UNALIGNED) 476 hlen = skb_zerocopy_headlen(skb); 477 else 478 hlen = skb->len; 479 480 len = upcall_msg_size(upcall_info, hlen - cutlen, 481 OVS_CB(skb)->acts_origlen); 482 user_skb = genlmsg_new(len, GFP_ATOMIC); 483 if (!user_skb) { 484 err = -ENOMEM; 485 goto out; 486 } 487 488 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 489 0, upcall_info->cmd); 490 if (!upcall) { 491 err = -EINVAL; 492 goto out; 493 } 494 upcall->dp_ifindex = dp_ifindex; 495 496 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); 497 if (err) 498 goto out; 499 500 if (upcall_info->userdata) 501 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 502 nla_len(upcall_info->userdata), 503 nla_data(upcall_info->userdata)); 504 505 if (upcall_info->egress_tun_info) { 506 nla = nla_nest_start_noflag(user_skb, 507 OVS_PACKET_ATTR_EGRESS_TUN_KEY); 508 if (!nla) { 509 err = -EMSGSIZE; 510 goto out; 511 } 512 err = ovs_nla_put_tunnel_info(user_skb, 513 upcall_info->egress_tun_info); 514 if (err) 515 goto out; 516 517 nla_nest_end(user_skb, nla); 518 } 519 520 if (upcall_info->actions_len) { 521 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS); 522 if (!nla) { 523 err = -EMSGSIZE; 524 goto out; 525 } 526 err = ovs_nla_put_actions(upcall_info->actions, 527 upcall_info->actions_len, 528 user_skb); 529 if (!err) 530 nla_nest_end(user_skb, nla); 531 else 532 nla_nest_cancel(user_skb, nla); 533 } 534 535 /* Add OVS_PACKET_ATTR_MRU */ 536 if (upcall_info->mru && 537 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) { 538 err = -ENOBUFS; 539 goto out; 540 } 541 542 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */ 543 if (cutlen > 0 && 544 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) { 545 err = -ENOBUFS; 546 goto out; 547 } 548 549 /* Add OVS_PACKET_ATTR_HASH */ 550 hash = skb_get_hash_raw(skb); 551 if (skb->sw_hash) 552 hash |= OVS_PACKET_HASH_SW_BIT; 553 554 if (skb->l4_hash) 555 hash |= OVS_PACKET_HASH_L4_BIT; 556 557 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) { 558 err = -ENOBUFS; 559 goto out; 560 } 561 562 /* Only reserve room for attribute header, packet data is added 563 * in skb_zerocopy() */ 564 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 565 err = -ENOBUFS; 566 goto out; 567 } 568 nla->nla_len = nla_attr_size(skb->len - cutlen); 569 570 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen); 571 if (err) 572 goto out; 573 574 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 575 pad_packet(dp, user_skb); 576 577 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 578 579 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 580 user_skb = NULL; 581 out: 582 if (err) 583 skb_tx_error(skb); 584 consume_skb(user_skb); 585 consume_skb(nskb); 586 587 return err; 588 } 589 590 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 591 { 592 struct ovs_header *ovs_header = genl_info_userhdr(info); 593 struct net *net = sock_net(skb->sk); 594 struct nlattr **a = info->attrs; 595 struct sw_flow_actions *acts; 596 struct sk_buff *packet; 597 struct sw_flow *flow; 598 struct sw_flow_actions *sf_acts; 599 struct datapath *dp; 600 struct vport *input_vport; 601 u16 mru = 0; 602 u64 hash; 603 int len; 604 int err; 605 bool log = !a[OVS_PACKET_ATTR_PROBE]; 606 607 err = -EINVAL; 608 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 609 !a[OVS_PACKET_ATTR_ACTIONS]) 610 goto err; 611 612 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 613 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 614 err = -ENOMEM; 615 if (!packet) 616 goto err; 617 skb_reserve(packet, NET_IP_ALIGN); 618 619 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 620 621 /* Set packet's mru */ 622 if (a[OVS_PACKET_ATTR_MRU]) { 623 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]); 624 packet->ignore_df = 1; 625 } 626 OVS_CB(packet)->mru = mru; 627 628 if (a[OVS_PACKET_ATTR_HASH]) { 629 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]); 630 631 __skb_set_hash(packet, hash & 0xFFFFFFFFULL, 632 !!(hash & OVS_PACKET_HASH_SW_BIT), 633 !!(hash & OVS_PACKET_HASH_L4_BIT)); 634 } 635 636 /* Build an sw_flow for sending this packet. */ 637 flow = ovs_flow_alloc(); 638 err = PTR_ERR(flow); 639 if (IS_ERR(flow)) 640 goto err_kfree_skb; 641 642 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY], 643 packet, &flow->key, log); 644 if (err) 645 goto err_flow_free; 646 647 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS], 648 &flow->key, &acts, log); 649 if (err) 650 goto err_flow_free; 651 652 rcu_assign_pointer(flow->sf_acts, acts); 653 packet->priority = flow->key.phy.priority; 654 packet->mark = flow->key.phy.skb_mark; 655 656 rcu_read_lock(); 657 dp = get_dp_rcu(net, ovs_header->dp_ifindex); 658 err = -ENODEV; 659 if (!dp) 660 goto err_unlock; 661 662 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 663 if (!input_vport) 664 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 665 666 if (!input_vport) 667 goto err_unlock; 668 669 packet->dev = input_vport->dev; 670 OVS_CB(packet)->input_vport = input_vport; 671 sf_acts = rcu_dereference(flow->sf_acts); 672 673 local_bh_disable(); 674 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); 675 local_bh_enable(); 676 rcu_read_unlock(); 677 678 ovs_flow_free(flow, false); 679 return err; 680 681 err_unlock: 682 rcu_read_unlock(); 683 err_flow_free: 684 ovs_flow_free(flow, false); 685 err_kfree_skb: 686 kfree_skb(packet); 687 err: 688 return err; 689 } 690 691 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 692 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 693 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 694 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 695 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, 696 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, 697 [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 }, 698 }; 699 700 static const struct genl_small_ops dp_packet_genl_ops[] = { 701 { .cmd = OVS_PACKET_CMD_EXECUTE, 702 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 703 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 704 .doit = ovs_packet_cmd_execute 705 } 706 }; 707 708 static struct genl_family dp_packet_genl_family __ro_after_init = { 709 .hdrsize = sizeof(struct ovs_header), 710 .name = OVS_PACKET_FAMILY, 711 .version = OVS_PACKET_VERSION, 712 .maxattr = OVS_PACKET_ATTR_MAX, 713 .policy = packet_policy, 714 .netnsok = true, 715 .parallel_ops = true, 716 .small_ops = dp_packet_genl_ops, 717 .n_small_ops = ARRAY_SIZE(dp_packet_genl_ops), 718 .resv_start_op = OVS_PACKET_CMD_EXECUTE + 1, 719 .module = THIS_MODULE, 720 }; 721 722 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 723 struct ovs_dp_megaflow_stats *mega_stats) 724 { 725 int i; 726 727 memset(mega_stats, 0, sizeof(*mega_stats)); 728 729 stats->n_flows = ovs_flow_tbl_count(&dp->table); 730 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 731 732 stats->n_hit = stats->n_missed = stats->n_lost = 0; 733 734 for_each_possible_cpu(i) { 735 const struct dp_stats_percpu *percpu_stats; 736 struct dp_stats_percpu local_stats; 737 unsigned int start; 738 739 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 740 741 do { 742 start = u64_stats_fetch_begin(&percpu_stats->syncp); 743 local_stats = *percpu_stats; 744 } while (u64_stats_fetch_retry(&percpu_stats->syncp, start)); 745 746 stats->n_hit += local_stats.n_hit; 747 stats->n_missed += local_stats.n_missed; 748 stats->n_lost += local_stats.n_lost; 749 mega_stats->n_mask_hit += local_stats.n_mask_hit; 750 mega_stats->n_cache_hit += local_stats.n_cache_hit; 751 } 752 } 753 754 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) 755 { 756 return ovs_identifier_is_ufid(sfid) && 757 !(ufid_flags & OVS_UFID_F_OMIT_KEY); 758 } 759 760 static bool should_fill_mask(uint32_t ufid_flags) 761 { 762 return !(ufid_flags & OVS_UFID_F_OMIT_MASK); 763 } 764 765 static bool should_fill_actions(uint32_t ufid_flags) 766 { 767 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); 768 } 769 770 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, 771 const struct sw_flow_id *sfid, 772 uint32_t ufid_flags) 773 { 774 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); 775 776 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback 777 * see ovs_nla_put_identifier() 778 */ 779 if (sfid && ovs_identifier_is_ufid(sfid)) 780 len += nla_total_size(sfid->ufid_len); 781 else 782 len += nla_total_size(ovs_key_attr_size()); 783 784 /* OVS_FLOW_ATTR_KEY */ 785 if (!sfid || should_fill_key(sfid, ufid_flags)) 786 len += nla_total_size(ovs_key_attr_size()); 787 788 /* OVS_FLOW_ATTR_MASK */ 789 if (should_fill_mask(ufid_flags)) 790 len += nla_total_size(ovs_key_attr_size()); 791 792 /* OVS_FLOW_ATTR_ACTIONS */ 793 if (should_fill_actions(ufid_flags)) 794 len += nla_total_size(acts->orig_len); 795 796 return len 797 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 798 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 799 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */ 800 } 801 802 /* Called with ovs_mutex or RCU read lock. */ 803 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 804 struct sk_buff *skb) 805 { 806 struct ovs_flow_stats stats; 807 __be16 tcp_flags; 808 unsigned long used; 809 810 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 811 812 if (used && 813 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used), 814 OVS_FLOW_ATTR_PAD)) 815 return -EMSGSIZE; 816 817 if (stats.n_packets && 818 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS, 819 sizeof(struct ovs_flow_stats), &stats, 820 OVS_FLOW_ATTR_PAD)) 821 return -EMSGSIZE; 822 823 if ((u8)ntohs(tcp_flags) && 824 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 825 return -EMSGSIZE; 826 827 return 0; 828 } 829 830 /* Called with ovs_mutex or RCU read lock. */ 831 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 832 struct sk_buff *skb, int skb_orig_len) 833 { 834 struct nlattr *start; 835 int err; 836 837 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 838 * this is the first flow to be dumped into 'skb'. This is unusual for 839 * Netlink but individual action lists can be longer than 840 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 841 * The userspace caller can always fetch the actions separately if it 842 * really wants them. (Most userspace callers in fact don't care.) 843 * 844 * This can only fail for dump operations because the skb is always 845 * properly sized for single flows. 846 */ 847 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS); 848 if (start) { 849 const struct sw_flow_actions *sf_acts; 850 851 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 852 err = ovs_nla_put_actions(sf_acts->actions, 853 sf_acts->actions_len, skb); 854 855 if (!err) 856 nla_nest_end(skb, start); 857 else { 858 if (skb_orig_len) 859 return err; 860 861 nla_nest_cancel(skb, start); 862 } 863 } else if (skb_orig_len) { 864 return -EMSGSIZE; 865 } 866 867 return 0; 868 } 869 870 /* Called with ovs_mutex or RCU read lock. */ 871 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 872 struct sk_buff *skb, u32 portid, 873 u32 seq, u32 flags, u8 cmd, u32 ufid_flags) 874 { 875 const int skb_orig_len = skb->len; 876 struct ovs_header *ovs_header; 877 int err; 878 879 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 880 flags, cmd); 881 if (!ovs_header) 882 return -EMSGSIZE; 883 884 ovs_header->dp_ifindex = dp_ifindex; 885 886 err = ovs_nla_put_identifier(flow, skb); 887 if (err) 888 goto error; 889 890 if (should_fill_key(&flow->id, ufid_flags)) { 891 err = ovs_nla_put_masked_key(flow, skb); 892 if (err) 893 goto error; 894 } 895 896 if (should_fill_mask(ufid_flags)) { 897 err = ovs_nla_put_mask(flow, skb); 898 if (err) 899 goto error; 900 } 901 902 err = ovs_flow_cmd_fill_stats(flow, skb); 903 if (err) 904 goto error; 905 906 if (should_fill_actions(ufid_flags)) { 907 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 908 if (err) 909 goto error; 910 } 911 912 genlmsg_end(skb, ovs_header); 913 return 0; 914 915 error: 916 genlmsg_cancel(skb, ovs_header); 917 return err; 918 } 919 920 /* May not be called with RCU read lock. */ 921 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 922 const struct sw_flow_id *sfid, 923 struct genl_info *info, 924 bool always, 925 uint32_t ufid_flags) 926 { 927 struct sk_buff *skb; 928 size_t len; 929 930 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 931 return NULL; 932 933 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); 934 skb = genlmsg_new(len, GFP_KERNEL); 935 if (!skb) 936 return ERR_PTR(-ENOMEM); 937 938 return skb; 939 } 940 941 /* Called with ovs_mutex. */ 942 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 943 int dp_ifindex, 944 struct genl_info *info, u8 cmd, 945 bool always, u32 ufid_flags) 946 { 947 struct sk_buff *skb; 948 int retval; 949 950 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), 951 &flow->id, info, always, ufid_flags); 952 if (IS_ERR_OR_NULL(skb)) 953 return skb; 954 955 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 956 info->snd_portid, info->snd_seq, 0, 957 cmd, ufid_flags); 958 if (WARN_ON_ONCE(retval < 0)) { 959 kfree_skb(skb); 960 skb = ERR_PTR(retval); 961 } 962 return skb; 963 } 964 965 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 966 { 967 struct net *net = sock_net(skb->sk); 968 struct nlattr **a = info->attrs; 969 struct ovs_header *ovs_header = genl_info_userhdr(info); 970 struct sw_flow *flow = NULL, *new_flow; 971 struct sw_flow_mask mask; 972 struct sk_buff *reply; 973 struct datapath *dp; 974 struct sw_flow_key *key; 975 struct sw_flow_actions *acts; 976 struct sw_flow_match match; 977 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 978 int error; 979 bool log = !a[OVS_FLOW_ATTR_PROBE]; 980 981 /* Must have key and actions. */ 982 error = -EINVAL; 983 if (!a[OVS_FLOW_ATTR_KEY]) { 984 OVS_NLERR(log, "Flow key attr not present in new flow."); 985 goto error; 986 } 987 if (!a[OVS_FLOW_ATTR_ACTIONS]) { 988 OVS_NLERR(log, "Flow actions attr not present in new flow."); 989 goto error; 990 } 991 992 /* Most of the time we need to allocate a new flow, do it before 993 * locking. 994 */ 995 new_flow = ovs_flow_alloc(); 996 if (IS_ERR(new_flow)) { 997 error = PTR_ERR(new_flow); 998 goto error; 999 } 1000 1001 /* Extract key. */ 1002 key = kzalloc(sizeof(*key), GFP_KERNEL); 1003 if (!key) { 1004 error = -ENOMEM; 1005 goto err_kfree_flow; 1006 } 1007 1008 ovs_match_init(&match, key, false, &mask); 1009 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1010 a[OVS_FLOW_ATTR_MASK], log); 1011 if (error) 1012 goto err_kfree_key; 1013 1014 ovs_flow_mask_key(&new_flow->key, key, true, &mask); 1015 1016 /* Extract flow identifier. */ 1017 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID], 1018 key, log); 1019 if (error) 1020 goto err_kfree_key; 1021 1022 /* Validate actions. */ 1023 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS], 1024 &new_flow->key, &acts, log); 1025 if (error) { 1026 OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); 1027 goto err_kfree_key; 1028 } 1029 1030 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false, 1031 ufid_flags); 1032 if (IS_ERR(reply)) { 1033 error = PTR_ERR(reply); 1034 goto err_kfree_acts; 1035 } 1036 1037 ovs_lock(); 1038 dp = get_dp(net, ovs_header->dp_ifindex); 1039 if (unlikely(!dp)) { 1040 error = -ENODEV; 1041 goto err_unlock_ovs; 1042 } 1043 1044 /* Check if this is a duplicate flow */ 1045 if (ovs_identifier_is_ufid(&new_flow->id)) 1046 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id); 1047 if (!flow) 1048 flow = ovs_flow_tbl_lookup(&dp->table, key); 1049 if (likely(!flow)) { 1050 rcu_assign_pointer(new_flow->sf_acts, acts); 1051 1052 /* Put flow in bucket. */ 1053 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 1054 if (unlikely(error)) { 1055 acts = NULL; 1056 goto err_unlock_ovs; 1057 } 1058 1059 if (unlikely(reply)) { 1060 error = ovs_flow_cmd_fill_info(new_flow, 1061 ovs_header->dp_ifindex, 1062 reply, info->snd_portid, 1063 info->snd_seq, 0, 1064 OVS_FLOW_CMD_NEW, 1065 ufid_flags); 1066 BUG_ON(error < 0); 1067 } 1068 ovs_unlock(); 1069 } else { 1070 struct sw_flow_actions *old_acts; 1071 1072 /* Bail out if we're not allowed to modify an existing flow. 1073 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 1074 * because Generic Netlink treats the latter as a dump 1075 * request. We also accept NLM_F_EXCL in case that bug ever 1076 * gets fixed. 1077 */ 1078 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 1079 | NLM_F_EXCL))) { 1080 error = -EEXIST; 1081 goto err_unlock_ovs; 1082 } 1083 /* The flow identifier has to be the same for flow updates. 1084 * Look for any overlapping flow. 1085 */ 1086 if (unlikely(!ovs_flow_cmp(flow, &match))) { 1087 if (ovs_identifier_is_key(&flow->id)) 1088 flow = ovs_flow_tbl_lookup_exact(&dp->table, 1089 &match); 1090 else /* UFID matches but key is different */ 1091 flow = NULL; 1092 if (!flow) { 1093 error = -ENOENT; 1094 goto err_unlock_ovs; 1095 } 1096 } 1097 /* Update actions. */ 1098 old_acts = ovsl_dereference(flow->sf_acts); 1099 rcu_assign_pointer(flow->sf_acts, acts); 1100 1101 if (unlikely(reply)) { 1102 error = ovs_flow_cmd_fill_info(flow, 1103 ovs_header->dp_ifindex, 1104 reply, info->snd_portid, 1105 info->snd_seq, 0, 1106 OVS_FLOW_CMD_NEW, 1107 ufid_flags); 1108 BUG_ON(error < 0); 1109 } 1110 ovs_unlock(); 1111 1112 ovs_nla_free_flow_actions_rcu(old_acts); 1113 ovs_flow_free(new_flow, false); 1114 } 1115 1116 if (reply) 1117 ovs_notify(&dp_flow_genl_family, reply, info); 1118 1119 kfree(key); 1120 return 0; 1121 1122 err_unlock_ovs: 1123 ovs_unlock(); 1124 kfree_skb(reply); 1125 err_kfree_acts: 1126 ovs_nla_free_flow_actions(acts); 1127 err_kfree_key: 1128 kfree(key); 1129 err_kfree_flow: 1130 ovs_flow_free(new_flow, false); 1131 error: 1132 return error; 1133 } 1134 1135 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ 1136 static noinline_for_stack 1137 struct sw_flow_actions *get_flow_actions(struct net *net, 1138 const struct nlattr *a, 1139 const struct sw_flow_key *key, 1140 const struct sw_flow_mask *mask, 1141 bool log) 1142 { 1143 struct sw_flow_actions *acts; 1144 struct sw_flow_key masked_key; 1145 int error; 1146 1147 ovs_flow_mask_key(&masked_key, key, true, mask); 1148 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log); 1149 if (error) { 1150 OVS_NLERR(log, 1151 "Actions may not be safe on all matching packets"); 1152 return ERR_PTR(error); 1153 } 1154 1155 return acts; 1156 } 1157 1158 /* Factor out match-init and action-copy to avoid 1159 * "Wframe-larger-than=1024" warning. Because mask is only 1160 * used to get actions, we new a function to save some 1161 * stack space. 1162 * 1163 * If there are not key and action attrs, we return 0 1164 * directly. In the case, the caller will also not use the 1165 * match as before. If there is action attr, we try to get 1166 * actions and save them to *acts. Before returning from 1167 * the function, we reset the match->mask pointer. Because 1168 * we should not to return match object with dangling reference 1169 * to mask. 1170 * */ 1171 static noinline_for_stack int 1172 ovs_nla_init_match_and_action(struct net *net, 1173 struct sw_flow_match *match, 1174 struct sw_flow_key *key, 1175 struct nlattr **a, 1176 struct sw_flow_actions **acts, 1177 bool log) 1178 { 1179 struct sw_flow_mask mask; 1180 int error = 0; 1181 1182 if (a[OVS_FLOW_ATTR_KEY]) { 1183 ovs_match_init(match, key, true, &mask); 1184 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY], 1185 a[OVS_FLOW_ATTR_MASK], log); 1186 if (error) 1187 goto error; 1188 } 1189 1190 if (a[OVS_FLOW_ATTR_ACTIONS]) { 1191 if (!a[OVS_FLOW_ATTR_KEY]) { 1192 OVS_NLERR(log, 1193 "Flow key attribute not present in set flow."); 1194 error = -EINVAL; 1195 goto error; 1196 } 1197 1198 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key, 1199 &mask, log); 1200 if (IS_ERR(*acts)) { 1201 error = PTR_ERR(*acts); 1202 goto error; 1203 } 1204 } 1205 1206 /* On success, error is 0. */ 1207 error: 1208 match->mask = NULL; 1209 return error; 1210 } 1211 1212 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 1213 { 1214 struct net *net = sock_net(skb->sk); 1215 struct nlattr **a = info->attrs; 1216 struct ovs_header *ovs_header = genl_info_userhdr(info); 1217 struct sw_flow_key key; 1218 struct sw_flow *flow; 1219 struct sk_buff *reply = NULL; 1220 struct datapath *dp; 1221 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 1222 struct sw_flow_match match; 1223 struct sw_flow_id sfid; 1224 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1225 int error = 0; 1226 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1227 bool ufid_present; 1228 1229 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); 1230 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) { 1231 OVS_NLERR(log, 1232 "Flow set message rejected, Key attribute missing."); 1233 return -EINVAL; 1234 } 1235 1236 error = ovs_nla_init_match_and_action(net, &match, &key, a, 1237 &acts, log); 1238 if (error) 1239 goto error; 1240 1241 if (acts) { 1242 /* Can allocate before locking if have acts. */ 1243 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false, 1244 ufid_flags); 1245 if (IS_ERR(reply)) { 1246 error = PTR_ERR(reply); 1247 goto err_kfree_acts; 1248 } 1249 } 1250 1251 ovs_lock(); 1252 dp = get_dp(net, ovs_header->dp_ifindex); 1253 if (unlikely(!dp)) { 1254 error = -ENODEV; 1255 goto err_unlock_ovs; 1256 } 1257 /* Check that the flow exists. */ 1258 if (ufid_present) 1259 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid); 1260 else 1261 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1262 if (unlikely(!flow)) { 1263 error = -ENOENT; 1264 goto err_unlock_ovs; 1265 } 1266 1267 /* Update actions, if present. */ 1268 if (likely(acts)) { 1269 old_acts = ovsl_dereference(flow->sf_acts); 1270 rcu_assign_pointer(flow->sf_acts, acts); 1271 1272 if (unlikely(reply)) { 1273 error = ovs_flow_cmd_fill_info(flow, 1274 ovs_header->dp_ifindex, 1275 reply, info->snd_portid, 1276 info->snd_seq, 0, 1277 OVS_FLOW_CMD_SET, 1278 ufid_flags); 1279 BUG_ON(error < 0); 1280 } 1281 } else { 1282 /* Could not alloc without acts before locking. */ 1283 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1284 info, OVS_FLOW_CMD_SET, false, 1285 ufid_flags); 1286 1287 if (IS_ERR(reply)) { 1288 error = PTR_ERR(reply); 1289 goto err_unlock_ovs; 1290 } 1291 } 1292 1293 /* Clear stats. */ 1294 if (a[OVS_FLOW_ATTR_CLEAR]) 1295 ovs_flow_stats_clear(flow); 1296 ovs_unlock(); 1297 1298 if (reply) 1299 ovs_notify(&dp_flow_genl_family, reply, info); 1300 if (old_acts) 1301 ovs_nla_free_flow_actions_rcu(old_acts); 1302 1303 return 0; 1304 1305 err_unlock_ovs: 1306 ovs_unlock(); 1307 kfree_skb(reply); 1308 err_kfree_acts: 1309 ovs_nla_free_flow_actions(acts); 1310 error: 1311 return error; 1312 } 1313 1314 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1315 { 1316 struct nlattr **a = info->attrs; 1317 struct ovs_header *ovs_header = genl_info_userhdr(info); 1318 struct net *net = sock_net(skb->sk); 1319 struct sw_flow_key key; 1320 struct sk_buff *reply; 1321 struct sw_flow *flow; 1322 struct datapath *dp; 1323 struct sw_flow_match match; 1324 struct sw_flow_id ufid; 1325 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1326 int err = 0; 1327 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1328 bool ufid_present; 1329 1330 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1331 if (a[OVS_FLOW_ATTR_KEY]) { 1332 ovs_match_init(&match, &key, true, NULL); 1333 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL, 1334 log); 1335 } else if (!ufid_present) { 1336 OVS_NLERR(log, 1337 "Flow get message rejected, Key attribute missing."); 1338 err = -EINVAL; 1339 } 1340 if (err) 1341 return err; 1342 1343 ovs_lock(); 1344 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1345 if (!dp) { 1346 err = -ENODEV; 1347 goto unlock; 1348 } 1349 1350 if (ufid_present) 1351 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1352 else 1353 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1354 if (!flow) { 1355 err = -ENOENT; 1356 goto unlock; 1357 } 1358 1359 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1360 OVS_FLOW_CMD_GET, true, ufid_flags); 1361 if (IS_ERR(reply)) { 1362 err = PTR_ERR(reply); 1363 goto unlock; 1364 } 1365 1366 ovs_unlock(); 1367 return genlmsg_reply(reply, info); 1368 unlock: 1369 ovs_unlock(); 1370 return err; 1371 } 1372 1373 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1374 { 1375 struct nlattr **a = info->attrs; 1376 struct ovs_header *ovs_header = genl_info_userhdr(info); 1377 struct net *net = sock_net(skb->sk); 1378 struct sw_flow_key key; 1379 struct sk_buff *reply; 1380 struct sw_flow *flow = NULL; 1381 struct datapath *dp; 1382 struct sw_flow_match match; 1383 struct sw_flow_id ufid; 1384 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1385 int err; 1386 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1387 bool ufid_present; 1388 1389 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1390 if (a[OVS_FLOW_ATTR_KEY]) { 1391 ovs_match_init(&match, &key, true, NULL); 1392 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1393 NULL, log); 1394 if (unlikely(err)) 1395 return err; 1396 } 1397 1398 ovs_lock(); 1399 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1400 if (unlikely(!dp)) { 1401 err = -ENODEV; 1402 goto unlock; 1403 } 1404 1405 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) { 1406 err = ovs_flow_tbl_flush(&dp->table); 1407 goto unlock; 1408 } 1409 1410 if (ufid_present) 1411 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1412 else 1413 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1414 if (unlikely(!flow)) { 1415 err = -ENOENT; 1416 goto unlock; 1417 } 1418 1419 ovs_flow_tbl_remove(&dp->table, flow); 1420 ovs_unlock(); 1421 1422 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1423 &flow->id, info, false, ufid_flags); 1424 if (likely(reply)) { 1425 if (!IS_ERR(reply)) { 1426 rcu_read_lock(); /*To keep RCU checker happy. */ 1427 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1428 reply, info->snd_portid, 1429 info->snd_seq, 0, 1430 OVS_FLOW_CMD_DEL, 1431 ufid_flags); 1432 rcu_read_unlock(); 1433 if (WARN_ON_ONCE(err < 0)) { 1434 kfree_skb(reply); 1435 goto out_free; 1436 } 1437 1438 ovs_notify(&dp_flow_genl_family, reply, info); 1439 } else { 1440 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, 1441 PTR_ERR(reply)); 1442 } 1443 } 1444 1445 out_free: 1446 ovs_flow_free(flow, true); 1447 return 0; 1448 unlock: 1449 ovs_unlock(); 1450 return err; 1451 } 1452 1453 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1454 { 1455 struct nlattr *a[__OVS_FLOW_ATTR_MAX]; 1456 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1457 struct table_instance *ti; 1458 struct datapath *dp; 1459 u32 ufid_flags; 1460 int err; 1461 1462 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a, 1463 OVS_FLOW_ATTR_MAX, flow_policy, NULL); 1464 if (err) 1465 return err; 1466 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1467 1468 rcu_read_lock(); 1469 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1470 if (!dp) { 1471 rcu_read_unlock(); 1472 return -ENODEV; 1473 } 1474 1475 ti = rcu_dereference(dp->table.ti); 1476 for (;;) { 1477 struct sw_flow *flow; 1478 u32 bucket, obj; 1479 1480 bucket = cb->args[0]; 1481 obj = cb->args[1]; 1482 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1483 if (!flow) 1484 break; 1485 1486 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1487 NETLINK_CB(cb->skb).portid, 1488 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1489 OVS_FLOW_CMD_GET, ufid_flags) < 0) 1490 break; 1491 1492 cb->args[0] = bucket; 1493 cb->args[1] = obj; 1494 } 1495 rcu_read_unlock(); 1496 return skb->len; 1497 } 1498 1499 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1500 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1501 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1502 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1503 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1504 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1505 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, 1506 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, 1507 }; 1508 1509 static const struct genl_small_ops dp_flow_genl_ops[] = { 1510 { .cmd = OVS_FLOW_CMD_NEW, 1511 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1512 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1513 .doit = ovs_flow_cmd_new 1514 }, 1515 { .cmd = OVS_FLOW_CMD_DEL, 1516 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1517 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1518 .doit = ovs_flow_cmd_del 1519 }, 1520 { .cmd = OVS_FLOW_CMD_GET, 1521 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1522 .flags = 0, /* OK for unprivileged users. */ 1523 .doit = ovs_flow_cmd_get, 1524 .dumpit = ovs_flow_cmd_dump 1525 }, 1526 { .cmd = OVS_FLOW_CMD_SET, 1527 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1528 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1529 .doit = ovs_flow_cmd_set, 1530 }, 1531 }; 1532 1533 static struct genl_family dp_flow_genl_family __ro_after_init = { 1534 .hdrsize = sizeof(struct ovs_header), 1535 .name = OVS_FLOW_FAMILY, 1536 .version = OVS_FLOW_VERSION, 1537 .maxattr = OVS_FLOW_ATTR_MAX, 1538 .policy = flow_policy, 1539 .netnsok = true, 1540 .parallel_ops = true, 1541 .small_ops = dp_flow_genl_ops, 1542 .n_small_ops = ARRAY_SIZE(dp_flow_genl_ops), 1543 .resv_start_op = OVS_FLOW_CMD_SET + 1, 1544 .mcgrps = &ovs_dp_flow_multicast_group, 1545 .n_mcgrps = 1, 1546 .module = THIS_MODULE, 1547 }; 1548 1549 static size_t ovs_dp_cmd_msg_size(void) 1550 { 1551 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1552 1553 msgsize += nla_total_size(IFNAMSIZ); 1554 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats)); 1555 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats)); 1556 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1557 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */ 1558 msgsize += nla_total_size(sizeof(u32) * nr_cpu_ids); /* OVS_DP_ATTR_PER_CPU_PIDS */ 1559 1560 return msgsize; 1561 } 1562 1563 /* Called with ovs_mutex. */ 1564 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1565 u32 portid, u32 seq, u32 flags, u8 cmd) 1566 { 1567 struct ovs_header *ovs_header; 1568 struct ovs_dp_stats dp_stats; 1569 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1570 struct dp_nlsk_pids *pids = ovsl_dereference(dp->upcall_portids); 1571 int err, pids_len; 1572 1573 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1574 flags, cmd); 1575 if (!ovs_header) 1576 goto error; 1577 1578 ovs_header->dp_ifindex = get_dpifindex(dp); 1579 1580 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1581 if (err) 1582 goto nla_put_failure; 1583 1584 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1585 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1586 &dp_stats, OVS_DP_ATTR_PAD)) 1587 goto nla_put_failure; 1588 1589 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1590 sizeof(struct ovs_dp_megaflow_stats), 1591 &dp_megaflow_stats, OVS_DP_ATTR_PAD)) 1592 goto nla_put_failure; 1593 1594 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1595 goto nla_put_failure; 1596 1597 if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE, 1598 ovs_flow_tbl_masks_cache_size(&dp->table))) 1599 goto nla_put_failure; 1600 1601 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU && pids) { 1602 pids_len = min(pids->n_pids, nr_cpu_ids) * sizeof(u32); 1603 if (nla_put(skb, OVS_DP_ATTR_PER_CPU_PIDS, pids_len, &pids->pids)) 1604 goto nla_put_failure; 1605 } 1606 1607 genlmsg_end(skb, ovs_header); 1608 return 0; 1609 1610 nla_put_failure: 1611 genlmsg_cancel(skb, ovs_header); 1612 error: 1613 return -EMSGSIZE; 1614 } 1615 1616 static struct sk_buff *ovs_dp_cmd_alloc_info(void) 1617 { 1618 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL); 1619 } 1620 1621 /* Called with rcu_read_lock or ovs_mutex. */ 1622 static struct datapath *lookup_datapath(struct net *net, 1623 const struct ovs_header *ovs_header, 1624 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1625 { 1626 struct datapath *dp; 1627 1628 if (!a[OVS_DP_ATTR_NAME]) 1629 dp = get_dp(net, ovs_header->dp_ifindex); 1630 else { 1631 struct vport *vport; 1632 1633 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1634 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1635 } 1636 return dp ? dp : ERR_PTR(-ENODEV); 1637 } 1638 1639 static void ovs_dp_reset_user_features(struct sk_buff *skb, 1640 struct genl_info *info) 1641 { 1642 struct datapath *dp; 1643 1644 dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info), 1645 info->attrs); 1646 if (IS_ERR(dp)) 1647 return; 1648 1649 pr_warn("%s: Dropping previously announced user features\n", 1650 ovs_dp_name(dp)); 1651 dp->user_features = 0; 1652 } 1653 1654 static int ovs_dp_set_upcall_portids(struct datapath *dp, 1655 const struct nlattr *ids) 1656 { 1657 struct dp_nlsk_pids *old, *dp_nlsk_pids; 1658 1659 if (!nla_len(ids) || nla_len(ids) % sizeof(u32)) 1660 return -EINVAL; 1661 1662 old = ovsl_dereference(dp->upcall_portids); 1663 1664 dp_nlsk_pids = kmalloc(sizeof(*dp_nlsk_pids) + nla_len(ids), 1665 GFP_KERNEL); 1666 if (!dp_nlsk_pids) 1667 return -ENOMEM; 1668 1669 dp_nlsk_pids->n_pids = nla_len(ids) / sizeof(u32); 1670 nla_memcpy(dp_nlsk_pids->pids, ids, nla_len(ids)); 1671 1672 rcu_assign_pointer(dp->upcall_portids, dp_nlsk_pids); 1673 1674 kfree_rcu(old, rcu); 1675 1676 return 0; 1677 } 1678 1679 u32 ovs_dp_get_upcall_portid(const struct datapath *dp, uint32_t cpu_id) 1680 { 1681 struct dp_nlsk_pids *dp_nlsk_pids; 1682 1683 dp_nlsk_pids = rcu_dereference(dp->upcall_portids); 1684 1685 if (dp_nlsk_pids) { 1686 if (cpu_id < dp_nlsk_pids->n_pids) { 1687 return dp_nlsk_pids->pids[cpu_id]; 1688 } else if (dp_nlsk_pids->n_pids > 0 && 1689 cpu_id >= dp_nlsk_pids->n_pids) { 1690 /* If the number of netlink PIDs is mismatched with 1691 * the number of CPUs as seen by the kernel, log this 1692 * and send the upcall to an arbitrary socket (0) in 1693 * order to not drop packets 1694 */ 1695 pr_info_ratelimited("cpu_id mismatch with handler threads"); 1696 return dp_nlsk_pids->pids[cpu_id % 1697 dp_nlsk_pids->n_pids]; 1698 } else { 1699 return 0; 1700 } 1701 } else { 1702 return 0; 1703 } 1704 } 1705 1706 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1707 { 1708 u32 user_features = 0, old_features = dp->user_features; 1709 int err; 1710 1711 if (a[OVS_DP_ATTR_USER_FEATURES]) { 1712 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1713 1714 if (user_features & ~(OVS_DP_F_VPORT_PIDS | 1715 OVS_DP_F_UNALIGNED | 1716 OVS_DP_F_TC_RECIRC_SHARING | 1717 OVS_DP_F_DISPATCH_UPCALL_PER_CPU)) 1718 return -EOPNOTSUPP; 1719 1720 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT) 1721 if (user_features & OVS_DP_F_TC_RECIRC_SHARING) 1722 return -EOPNOTSUPP; 1723 #endif 1724 } 1725 1726 if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) { 1727 int err; 1728 u32 cache_size; 1729 1730 cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]); 1731 err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size); 1732 if (err) 1733 return err; 1734 } 1735 1736 dp->user_features = user_features; 1737 1738 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU && 1739 a[OVS_DP_ATTR_PER_CPU_PIDS]) { 1740 /* Upcall Netlink Port IDs have been updated */ 1741 err = ovs_dp_set_upcall_portids(dp, 1742 a[OVS_DP_ATTR_PER_CPU_PIDS]); 1743 if (err) 1744 return err; 1745 } 1746 1747 if ((dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) && 1748 !(old_features & OVS_DP_F_TC_RECIRC_SHARING)) 1749 tc_skb_ext_tc_enable(); 1750 else if (!(dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) && 1751 (old_features & OVS_DP_F_TC_RECIRC_SHARING)) 1752 tc_skb_ext_tc_disable(); 1753 1754 return 0; 1755 } 1756 1757 static int ovs_dp_stats_init(struct datapath *dp) 1758 { 1759 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1760 if (!dp->stats_percpu) 1761 return -ENOMEM; 1762 1763 return 0; 1764 } 1765 1766 static int ovs_dp_vport_init(struct datapath *dp) 1767 { 1768 int i; 1769 1770 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS, 1771 sizeof(struct hlist_head), 1772 GFP_KERNEL); 1773 if (!dp->ports) 1774 return -ENOMEM; 1775 1776 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1777 INIT_HLIST_HEAD(&dp->ports[i]); 1778 1779 return 0; 1780 } 1781 1782 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1783 { 1784 struct nlattr **a = info->attrs; 1785 struct vport_parms parms; 1786 struct sk_buff *reply; 1787 struct datapath *dp; 1788 struct vport *vport; 1789 struct ovs_net *ovs_net; 1790 int err; 1791 1792 err = -EINVAL; 1793 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1794 goto err; 1795 1796 reply = ovs_dp_cmd_alloc_info(); 1797 if (!reply) 1798 return -ENOMEM; 1799 1800 err = -ENOMEM; 1801 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1802 if (dp == NULL) 1803 goto err_destroy_reply; 1804 1805 ovs_dp_set_net(dp, sock_net(skb->sk)); 1806 1807 /* Allocate table. */ 1808 err = ovs_flow_tbl_init(&dp->table); 1809 if (err) 1810 goto err_destroy_dp; 1811 1812 err = ovs_dp_stats_init(dp); 1813 if (err) 1814 goto err_destroy_table; 1815 1816 err = ovs_dp_vport_init(dp); 1817 if (err) 1818 goto err_destroy_stats; 1819 1820 err = ovs_meters_init(dp); 1821 if (err) 1822 goto err_destroy_ports; 1823 1824 /* Set up our datapath device. */ 1825 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1826 parms.type = OVS_VPORT_TYPE_INTERNAL; 1827 parms.options = NULL; 1828 parms.dp = dp; 1829 parms.port_no = OVSP_LOCAL; 1830 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1831 parms.desired_ifindex = a[OVS_DP_ATTR_IFINDEX] 1832 ? nla_get_s32(a[OVS_DP_ATTR_IFINDEX]) : 0; 1833 1834 /* So far only local changes have been made, now need the lock. */ 1835 ovs_lock(); 1836 1837 err = ovs_dp_change(dp, a); 1838 if (err) 1839 goto err_unlock_and_destroy_meters; 1840 1841 vport = new_vport(&parms); 1842 if (IS_ERR(vport)) { 1843 err = PTR_ERR(vport); 1844 if (err == -EBUSY) 1845 err = -EEXIST; 1846 1847 if (err == -EEXIST) { 1848 /* An outdated user space instance that does not understand 1849 * the concept of user_features has attempted to create a new 1850 * datapath and is likely to reuse it. Drop all user features. 1851 */ 1852 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1853 ovs_dp_reset_user_features(skb, info); 1854 } 1855 1856 goto err_destroy_portids; 1857 } 1858 1859 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1860 info->snd_seq, 0, OVS_DP_CMD_NEW); 1861 BUG_ON(err < 0); 1862 1863 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1864 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1865 1866 ovs_unlock(); 1867 1868 ovs_notify(&dp_datapath_genl_family, reply, info); 1869 return 0; 1870 1871 err_destroy_portids: 1872 kfree(rcu_dereference_raw(dp->upcall_portids)); 1873 err_unlock_and_destroy_meters: 1874 ovs_unlock(); 1875 ovs_meters_exit(dp); 1876 err_destroy_ports: 1877 kfree(dp->ports); 1878 err_destroy_stats: 1879 free_percpu(dp->stats_percpu); 1880 err_destroy_table: 1881 ovs_flow_tbl_destroy(&dp->table); 1882 err_destroy_dp: 1883 kfree(dp); 1884 err_destroy_reply: 1885 kfree_skb(reply); 1886 err: 1887 return err; 1888 } 1889 1890 /* Called with ovs_mutex. */ 1891 static void __dp_destroy(struct datapath *dp) 1892 { 1893 struct flow_table *table = &dp->table; 1894 int i; 1895 1896 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) 1897 tc_skb_ext_tc_disable(); 1898 1899 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1900 struct vport *vport; 1901 struct hlist_node *n; 1902 1903 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1904 if (vport->port_no != OVSP_LOCAL) 1905 ovs_dp_detach_port(vport); 1906 } 1907 1908 list_del_rcu(&dp->list_node); 1909 1910 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1911 * all ports in datapath are destroyed first before freeing datapath. 1912 */ 1913 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1914 1915 /* Flush sw_flow in the tables. RCU cb only releases resource 1916 * such as dp, ports and tables. That may avoid some issues 1917 * such as RCU usage warning. 1918 */ 1919 table_instance_flow_flush(table, ovsl_dereference(table->ti), 1920 ovsl_dereference(table->ufid_ti)); 1921 1922 /* RCU destroy the ports, meters and flow tables. */ 1923 call_rcu(&dp->rcu, destroy_dp_rcu); 1924 } 1925 1926 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1927 { 1928 struct sk_buff *reply; 1929 struct datapath *dp; 1930 int err; 1931 1932 reply = ovs_dp_cmd_alloc_info(); 1933 if (!reply) 1934 return -ENOMEM; 1935 1936 ovs_lock(); 1937 dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info), 1938 info->attrs); 1939 err = PTR_ERR(dp); 1940 if (IS_ERR(dp)) 1941 goto err_unlock_free; 1942 1943 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1944 info->snd_seq, 0, OVS_DP_CMD_DEL); 1945 BUG_ON(err < 0); 1946 1947 __dp_destroy(dp); 1948 ovs_unlock(); 1949 1950 ovs_notify(&dp_datapath_genl_family, reply, info); 1951 1952 return 0; 1953 1954 err_unlock_free: 1955 ovs_unlock(); 1956 kfree_skb(reply); 1957 return err; 1958 } 1959 1960 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1961 { 1962 struct sk_buff *reply; 1963 struct datapath *dp; 1964 int err; 1965 1966 reply = ovs_dp_cmd_alloc_info(); 1967 if (!reply) 1968 return -ENOMEM; 1969 1970 ovs_lock(); 1971 dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info), 1972 info->attrs); 1973 err = PTR_ERR(dp); 1974 if (IS_ERR(dp)) 1975 goto err_unlock_free; 1976 1977 err = ovs_dp_change(dp, info->attrs); 1978 if (err) 1979 goto err_unlock_free; 1980 1981 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1982 info->snd_seq, 0, OVS_DP_CMD_SET); 1983 BUG_ON(err < 0); 1984 1985 ovs_unlock(); 1986 ovs_notify(&dp_datapath_genl_family, reply, info); 1987 1988 return 0; 1989 1990 err_unlock_free: 1991 ovs_unlock(); 1992 kfree_skb(reply); 1993 return err; 1994 } 1995 1996 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1997 { 1998 struct sk_buff *reply; 1999 struct datapath *dp; 2000 int err; 2001 2002 reply = ovs_dp_cmd_alloc_info(); 2003 if (!reply) 2004 return -ENOMEM; 2005 2006 ovs_lock(); 2007 dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info), 2008 info->attrs); 2009 if (IS_ERR(dp)) { 2010 err = PTR_ERR(dp); 2011 goto err_unlock_free; 2012 } 2013 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 2014 info->snd_seq, 0, OVS_DP_CMD_GET); 2015 BUG_ON(err < 0); 2016 ovs_unlock(); 2017 2018 return genlmsg_reply(reply, info); 2019 2020 err_unlock_free: 2021 ovs_unlock(); 2022 kfree_skb(reply); 2023 return err; 2024 } 2025 2026 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2027 { 2028 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 2029 struct datapath *dp; 2030 int skip = cb->args[0]; 2031 int i = 0; 2032 2033 ovs_lock(); 2034 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2035 if (i >= skip && 2036 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 2037 cb->nlh->nlmsg_seq, NLM_F_MULTI, 2038 OVS_DP_CMD_GET) < 0) 2039 break; 2040 i++; 2041 } 2042 ovs_unlock(); 2043 2044 cb->args[0] = i; 2045 2046 return skb->len; 2047 } 2048 2049 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 2050 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2051 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 2052 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 2053 [OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0, 2054 PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)), 2055 [OVS_DP_ATTR_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 0), 2056 }; 2057 2058 static const struct genl_small_ops dp_datapath_genl_ops[] = { 2059 { .cmd = OVS_DP_CMD_NEW, 2060 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2061 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2062 .doit = ovs_dp_cmd_new 2063 }, 2064 { .cmd = OVS_DP_CMD_DEL, 2065 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2066 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2067 .doit = ovs_dp_cmd_del 2068 }, 2069 { .cmd = OVS_DP_CMD_GET, 2070 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2071 .flags = 0, /* OK for unprivileged users. */ 2072 .doit = ovs_dp_cmd_get, 2073 .dumpit = ovs_dp_cmd_dump 2074 }, 2075 { .cmd = OVS_DP_CMD_SET, 2076 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2077 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2078 .doit = ovs_dp_cmd_set, 2079 }, 2080 }; 2081 2082 static struct genl_family dp_datapath_genl_family __ro_after_init = { 2083 .hdrsize = sizeof(struct ovs_header), 2084 .name = OVS_DATAPATH_FAMILY, 2085 .version = OVS_DATAPATH_VERSION, 2086 .maxattr = OVS_DP_ATTR_MAX, 2087 .policy = datapath_policy, 2088 .netnsok = true, 2089 .parallel_ops = true, 2090 .small_ops = dp_datapath_genl_ops, 2091 .n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops), 2092 .resv_start_op = OVS_DP_CMD_SET + 1, 2093 .mcgrps = &ovs_dp_datapath_multicast_group, 2094 .n_mcgrps = 1, 2095 .module = THIS_MODULE, 2096 }; 2097 2098 /* Called with ovs_mutex or RCU read lock. */ 2099 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 2100 struct net *net, u32 portid, u32 seq, 2101 u32 flags, u8 cmd, gfp_t gfp) 2102 { 2103 struct ovs_header *ovs_header; 2104 struct ovs_vport_stats vport_stats; 2105 int err; 2106 2107 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 2108 flags, cmd); 2109 if (!ovs_header) 2110 return -EMSGSIZE; 2111 2112 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 2113 2114 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 2115 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 2116 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 2117 ovs_vport_name(vport)) || 2118 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex)) 2119 goto nla_put_failure; 2120 2121 if (!net_eq(net, dev_net(vport->dev))) { 2122 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp); 2123 2124 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id)) 2125 goto nla_put_failure; 2126 } 2127 2128 ovs_vport_get_stats(vport, &vport_stats); 2129 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS, 2130 sizeof(struct ovs_vport_stats), &vport_stats, 2131 OVS_VPORT_ATTR_PAD)) 2132 goto nla_put_failure; 2133 2134 if (ovs_vport_get_upcall_stats(vport, skb)) 2135 goto nla_put_failure; 2136 2137 if (ovs_vport_get_upcall_portids(vport, skb)) 2138 goto nla_put_failure; 2139 2140 err = ovs_vport_get_options(vport, skb); 2141 if (err == -EMSGSIZE) 2142 goto error; 2143 2144 genlmsg_end(skb, ovs_header); 2145 return 0; 2146 2147 nla_put_failure: 2148 err = -EMSGSIZE; 2149 error: 2150 genlmsg_cancel(skb, ovs_header); 2151 return err; 2152 } 2153 2154 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 2155 { 2156 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2157 } 2158 2159 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 2160 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net, 2161 u32 portid, u32 seq, u8 cmd) 2162 { 2163 struct sk_buff *skb; 2164 int retval; 2165 2166 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2167 if (!skb) 2168 return ERR_PTR(-ENOMEM); 2169 2170 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd, 2171 GFP_KERNEL); 2172 BUG_ON(retval < 0); 2173 2174 return skb; 2175 } 2176 2177 /* Called with ovs_mutex or RCU read lock. */ 2178 static struct vport *lookup_vport(struct net *net, 2179 const struct ovs_header *ovs_header, 2180 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 2181 { 2182 struct datapath *dp; 2183 struct vport *vport; 2184 2185 if (a[OVS_VPORT_ATTR_IFINDEX]) 2186 return ERR_PTR(-EOPNOTSUPP); 2187 if (a[OVS_VPORT_ATTR_NAME]) { 2188 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 2189 if (!vport) 2190 return ERR_PTR(-ENODEV); 2191 if (ovs_header->dp_ifindex && 2192 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 2193 return ERR_PTR(-ENODEV); 2194 return vport; 2195 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 2196 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 2197 2198 if (port_no >= DP_MAX_PORTS) 2199 return ERR_PTR(-EFBIG); 2200 2201 dp = get_dp(net, ovs_header->dp_ifindex); 2202 if (!dp) 2203 return ERR_PTR(-ENODEV); 2204 2205 vport = ovs_vport_ovsl_rcu(dp, port_no); 2206 if (!vport) 2207 return ERR_PTR(-ENODEV); 2208 return vport; 2209 } else 2210 return ERR_PTR(-EINVAL); 2211 2212 } 2213 2214 static unsigned int ovs_get_max_headroom(struct datapath *dp) 2215 { 2216 unsigned int dev_headroom, max_headroom = 0; 2217 struct net_device *dev; 2218 struct vport *vport; 2219 int i; 2220 2221 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2222 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, 2223 lockdep_ovsl_is_held()) { 2224 dev = vport->dev; 2225 dev_headroom = netdev_get_fwd_headroom(dev); 2226 if (dev_headroom > max_headroom) 2227 max_headroom = dev_headroom; 2228 } 2229 } 2230 2231 return max_headroom; 2232 } 2233 2234 /* Called with ovs_mutex */ 2235 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom) 2236 { 2237 struct vport *vport; 2238 int i; 2239 2240 dp->max_headroom = new_headroom; 2241 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2242 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, 2243 lockdep_ovsl_is_held()) 2244 netdev_set_rx_headroom(vport->dev, new_headroom); 2245 } 2246 } 2247 2248 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 2249 { 2250 struct nlattr **a = info->attrs; 2251 struct ovs_header *ovs_header = genl_info_userhdr(info); 2252 struct vport_parms parms; 2253 struct sk_buff *reply; 2254 struct vport *vport; 2255 struct datapath *dp; 2256 unsigned int new_headroom; 2257 u32 port_no; 2258 int err; 2259 2260 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 2261 !a[OVS_VPORT_ATTR_UPCALL_PID]) 2262 return -EINVAL; 2263 2264 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 2265 2266 if (a[OVS_VPORT_ATTR_IFINDEX] && parms.type != OVS_VPORT_TYPE_INTERNAL) 2267 return -EOPNOTSUPP; 2268 2269 port_no = a[OVS_VPORT_ATTR_PORT_NO] 2270 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 2271 if (port_no >= DP_MAX_PORTS) 2272 return -EFBIG; 2273 2274 reply = ovs_vport_cmd_alloc_info(); 2275 if (!reply) 2276 return -ENOMEM; 2277 2278 ovs_lock(); 2279 restart: 2280 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 2281 err = -ENODEV; 2282 if (!dp) 2283 goto exit_unlock_free; 2284 2285 if (port_no) { 2286 vport = ovs_vport_ovsl(dp, port_no); 2287 err = -EBUSY; 2288 if (vport) 2289 goto exit_unlock_free; 2290 } else { 2291 for (port_no = 1; ; port_no++) { 2292 if (port_no >= DP_MAX_PORTS) { 2293 err = -EFBIG; 2294 goto exit_unlock_free; 2295 } 2296 vport = ovs_vport_ovsl(dp, port_no); 2297 if (!vport) 2298 break; 2299 } 2300 } 2301 2302 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 2303 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 2304 parms.dp = dp; 2305 parms.port_no = port_no; 2306 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2307 parms.desired_ifindex = a[OVS_VPORT_ATTR_IFINDEX] 2308 ? nla_get_s32(a[OVS_VPORT_ATTR_IFINDEX]) : 0; 2309 2310 vport = new_vport(&parms); 2311 err = PTR_ERR(vport); 2312 if (IS_ERR(vport)) { 2313 if (err == -EAGAIN) 2314 goto restart; 2315 goto exit_unlock_free; 2316 } 2317 2318 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2319 info->snd_portid, info->snd_seq, 0, 2320 OVS_VPORT_CMD_NEW, GFP_KERNEL); 2321 2322 new_headroom = netdev_get_fwd_headroom(vport->dev); 2323 2324 if (new_headroom > dp->max_headroom) 2325 ovs_update_headroom(dp, new_headroom); 2326 else 2327 netdev_set_rx_headroom(vport->dev, dp->max_headroom); 2328 2329 BUG_ON(err < 0); 2330 ovs_unlock(); 2331 2332 ovs_notify(&dp_vport_genl_family, reply, info); 2333 return 0; 2334 2335 exit_unlock_free: 2336 ovs_unlock(); 2337 kfree_skb(reply); 2338 return err; 2339 } 2340 2341 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 2342 { 2343 struct nlattr **a = info->attrs; 2344 struct sk_buff *reply; 2345 struct vport *vport; 2346 int err; 2347 2348 reply = ovs_vport_cmd_alloc_info(); 2349 if (!reply) 2350 return -ENOMEM; 2351 2352 ovs_lock(); 2353 vport = lookup_vport(sock_net(skb->sk), genl_info_userhdr(info), a); 2354 err = PTR_ERR(vport); 2355 if (IS_ERR(vport)) 2356 goto exit_unlock_free; 2357 2358 if (a[OVS_VPORT_ATTR_TYPE] && 2359 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 2360 err = -EINVAL; 2361 goto exit_unlock_free; 2362 } 2363 2364 if (a[OVS_VPORT_ATTR_OPTIONS]) { 2365 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 2366 if (err) 2367 goto exit_unlock_free; 2368 } 2369 2370 2371 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 2372 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2373 2374 err = ovs_vport_set_upcall_portids(vport, ids); 2375 if (err) 2376 goto exit_unlock_free; 2377 } 2378 2379 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2380 info->snd_portid, info->snd_seq, 0, 2381 OVS_VPORT_CMD_SET, GFP_KERNEL); 2382 BUG_ON(err < 0); 2383 2384 ovs_unlock(); 2385 ovs_notify(&dp_vport_genl_family, reply, info); 2386 return 0; 2387 2388 exit_unlock_free: 2389 ovs_unlock(); 2390 kfree_skb(reply); 2391 return err; 2392 } 2393 2394 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2395 { 2396 bool update_headroom = false; 2397 struct nlattr **a = info->attrs; 2398 struct sk_buff *reply; 2399 struct datapath *dp; 2400 struct vport *vport; 2401 unsigned int new_headroom; 2402 int err; 2403 2404 reply = ovs_vport_cmd_alloc_info(); 2405 if (!reply) 2406 return -ENOMEM; 2407 2408 ovs_lock(); 2409 vport = lookup_vport(sock_net(skb->sk), genl_info_userhdr(info), a); 2410 err = PTR_ERR(vport); 2411 if (IS_ERR(vport)) 2412 goto exit_unlock_free; 2413 2414 if (vport->port_no == OVSP_LOCAL) { 2415 err = -EINVAL; 2416 goto exit_unlock_free; 2417 } 2418 2419 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2420 info->snd_portid, info->snd_seq, 0, 2421 OVS_VPORT_CMD_DEL, GFP_KERNEL); 2422 BUG_ON(err < 0); 2423 2424 /* the vport deletion may trigger dp headroom update */ 2425 dp = vport->dp; 2426 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom) 2427 update_headroom = true; 2428 2429 netdev_reset_rx_headroom(vport->dev); 2430 ovs_dp_detach_port(vport); 2431 2432 if (update_headroom) { 2433 new_headroom = ovs_get_max_headroom(dp); 2434 2435 if (new_headroom < dp->max_headroom) 2436 ovs_update_headroom(dp, new_headroom); 2437 } 2438 ovs_unlock(); 2439 2440 ovs_notify(&dp_vport_genl_family, reply, info); 2441 return 0; 2442 2443 exit_unlock_free: 2444 ovs_unlock(); 2445 kfree_skb(reply); 2446 return err; 2447 } 2448 2449 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2450 { 2451 struct nlattr **a = info->attrs; 2452 struct ovs_header *ovs_header = genl_info_userhdr(info); 2453 struct sk_buff *reply; 2454 struct vport *vport; 2455 int err; 2456 2457 reply = ovs_vport_cmd_alloc_info(); 2458 if (!reply) 2459 return -ENOMEM; 2460 2461 rcu_read_lock(); 2462 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2463 err = PTR_ERR(vport); 2464 if (IS_ERR(vport)) 2465 goto exit_unlock_free; 2466 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2467 info->snd_portid, info->snd_seq, 0, 2468 OVS_VPORT_CMD_GET, GFP_ATOMIC); 2469 BUG_ON(err < 0); 2470 rcu_read_unlock(); 2471 2472 return genlmsg_reply(reply, info); 2473 2474 exit_unlock_free: 2475 rcu_read_unlock(); 2476 kfree_skb(reply); 2477 return err; 2478 } 2479 2480 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2481 { 2482 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2483 struct datapath *dp; 2484 int bucket = cb->args[0], skip = cb->args[1]; 2485 int i, j = 0; 2486 2487 rcu_read_lock(); 2488 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2489 if (!dp) { 2490 rcu_read_unlock(); 2491 return -ENODEV; 2492 } 2493 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2494 struct vport *vport; 2495 2496 j = 0; 2497 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2498 if (j >= skip && 2499 ovs_vport_cmd_fill_info(vport, skb, 2500 sock_net(skb->sk), 2501 NETLINK_CB(cb->skb).portid, 2502 cb->nlh->nlmsg_seq, 2503 NLM_F_MULTI, 2504 OVS_VPORT_CMD_GET, 2505 GFP_ATOMIC) < 0) 2506 goto out; 2507 2508 j++; 2509 } 2510 skip = 0; 2511 } 2512 out: 2513 rcu_read_unlock(); 2514 2515 cb->args[0] = i; 2516 cb->args[1] = j; 2517 2518 return skb->len; 2519 } 2520 2521 static void ovs_dp_masks_rebalance(struct work_struct *work) 2522 { 2523 struct ovs_net *ovs_net = container_of(work, struct ovs_net, 2524 masks_rebalance.work); 2525 struct datapath *dp; 2526 2527 ovs_lock(); 2528 2529 list_for_each_entry(dp, &ovs_net->dps, list_node) 2530 ovs_flow_masks_rebalance(&dp->table); 2531 2532 ovs_unlock(); 2533 2534 schedule_delayed_work(&ovs_net->masks_rebalance, 2535 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL)); 2536 } 2537 2538 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2539 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2540 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2541 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2542 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2543 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC }, 2544 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2545 [OVS_VPORT_ATTR_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 0), 2546 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 }, 2547 [OVS_VPORT_ATTR_UPCALL_STATS] = { .type = NLA_NESTED }, 2548 }; 2549 2550 static const struct genl_small_ops dp_vport_genl_ops[] = { 2551 { .cmd = OVS_VPORT_CMD_NEW, 2552 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2553 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2554 .doit = ovs_vport_cmd_new 2555 }, 2556 { .cmd = OVS_VPORT_CMD_DEL, 2557 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2558 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2559 .doit = ovs_vport_cmd_del 2560 }, 2561 { .cmd = OVS_VPORT_CMD_GET, 2562 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2563 .flags = 0, /* OK for unprivileged users. */ 2564 .doit = ovs_vport_cmd_get, 2565 .dumpit = ovs_vport_cmd_dump 2566 }, 2567 { .cmd = OVS_VPORT_CMD_SET, 2568 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2569 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2570 .doit = ovs_vport_cmd_set, 2571 }, 2572 }; 2573 2574 struct genl_family dp_vport_genl_family __ro_after_init = { 2575 .hdrsize = sizeof(struct ovs_header), 2576 .name = OVS_VPORT_FAMILY, 2577 .version = OVS_VPORT_VERSION, 2578 .maxattr = OVS_VPORT_ATTR_MAX, 2579 .policy = vport_policy, 2580 .netnsok = true, 2581 .parallel_ops = true, 2582 .small_ops = dp_vport_genl_ops, 2583 .n_small_ops = ARRAY_SIZE(dp_vport_genl_ops), 2584 .resv_start_op = OVS_VPORT_CMD_SET + 1, 2585 .mcgrps = &ovs_dp_vport_multicast_group, 2586 .n_mcgrps = 1, 2587 .module = THIS_MODULE, 2588 }; 2589 2590 static struct genl_family * const dp_genl_families[] = { 2591 &dp_datapath_genl_family, 2592 &dp_vport_genl_family, 2593 &dp_flow_genl_family, 2594 &dp_packet_genl_family, 2595 &dp_meter_genl_family, 2596 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 2597 &dp_ct_limit_genl_family, 2598 #endif 2599 }; 2600 2601 static void dp_unregister_genl(int n_families) 2602 { 2603 int i; 2604 2605 for (i = 0; i < n_families; i++) 2606 genl_unregister_family(dp_genl_families[i]); 2607 } 2608 2609 static int __init dp_register_genl(void) 2610 { 2611 int err; 2612 int i; 2613 2614 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2615 2616 err = genl_register_family(dp_genl_families[i]); 2617 if (err) 2618 goto error; 2619 } 2620 2621 return 0; 2622 2623 error: 2624 dp_unregister_genl(i); 2625 return err; 2626 } 2627 2628 static int __net_init ovs_init_net(struct net *net) 2629 { 2630 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2631 int err; 2632 2633 INIT_LIST_HEAD(&ovs_net->dps); 2634 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2635 INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance); 2636 2637 err = ovs_ct_init(net); 2638 if (err) 2639 return err; 2640 2641 schedule_delayed_work(&ovs_net->masks_rebalance, 2642 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL)); 2643 return 0; 2644 } 2645 2646 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2647 struct list_head *head) 2648 { 2649 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2650 struct datapath *dp; 2651 2652 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2653 int i; 2654 2655 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2656 struct vport *vport; 2657 2658 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2659 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2660 continue; 2661 2662 if (dev_net(vport->dev) == dnet) 2663 list_add(&vport->detach_list, head); 2664 } 2665 } 2666 } 2667 } 2668 2669 static void __net_exit ovs_exit_net(struct net *dnet) 2670 { 2671 struct datapath *dp, *dp_next; 2672 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2673 struct vport *vport, *vport_next; 2674 struct net *net; 2675 LIST_HEAD(head); 2676 2677 ovs_lock(); 2678 2679 ovs_ct_exit(dnet); 2680 2681 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2682 __dp_destroy(dp); 2683 2684 down_read(&net_rwsem); 2685 for_each_net(net) 2686 list_vports_from_net(net, dnet, &head); 2687 up_read(&net_rwsem); 2688 2689 /* Detach all vports from given namespace. */ 2690 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2691 list_del(&vport->detach_list); 2692 ovs_dp_detach_port(vport); 2693 } 2694 2695 ovs_unlock(); 2696 2697 cancel_delayed_work_sync(&ovs_net->masks_rebalance); 2698 cancel_work_sync(&ovs_net->dp_notify_work); 2699 } 2700 2701 static struct pernet_operations ovs_net_ops = { 2702 .init = ovs_init_net, 2703 .exit = ovs_exit_net, 2704 .id = &ovs_net_id, 2705 .size = sizeof(struct ovs_net), 2706 }; 2707 2708 static const char * const ovs_drop_reasons[] = { 2709 #define S(x) [(x) & ~SKB_DROP_REASON_SUBSYS_MASK] = (#x), 2710 OVS_DROP_REASONS(S) 2711 #undef S 2712 }; 2713 2714 static struct drop_reason_list drop_reason_list_ovs = { 2715 .reasons = ovs_drop_reasons, 2716 .n_reasons = ARRAY_SIZE(ovs_drop_reasons), 2717 }; 2718 2719 static int __init dp_init(void) 2720 { 2721 int err; 2722 2723 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > 2724 sizeof_field(struct sk_buff, cb)); 2725 2726 pr_info("Open vSwitch switching datapath\n"); 2727 2728 err = action_fifos_init(); 2729 if (err) 2730 goto error; 2731 2732 err = ovs_internal_dev_rtnl_link_register(); 2733 if (err) 2734 goto error_action_fifos_exit; 2735 2736 err = ovs_flow_init(); 2737 if (err) 2738 goto error_unreg_rtnl_link; 2739 2740 err = ovs_vport_init(); 2741 if (err) 2742 goto error_flow_exit; 2743 2744 err = register_pernet_device(&ovs_net_ops); 2745 if (err) 2746 goto error_vport_exit; 2747 2748 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2749 if (err) 2750 goto error_netns_exit; 2751 2752 err = ovs_netdev_init(); 2753 if (err) 2754 goto error_unreg_notifier; 2755 2756 err = dp_register_genl(); 2757 if (err < 0) 2758 goto error_unreg_netdev; 2759 2760 drop_reasons_register_subsys(SKB_DROP_REASON_SUBSYS_OPENVSWITCH, 2761 &drop_reason_list_ovs); 2762 2763 return 0; 2764 2765 error_unreg_netdev: 2766 ovs_netdev_exit(); 2767 error_unreg_notifier: 2768 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2769 error_netns_exit: 2770 unregister_pernet_device(&ovs_net_ops); 2771 error_vport_exit: 2772 ovs_vport_exit(); 2773 error_flow_exit: 2774 ovs_flow_exit(); 2775 error_unreg_rtnl_link: 2776 ovs_internal_dev_rtnl_link_unregister(); 2777 error_action_fifos_exit: 2778 action_fifos_exit(); 2779 error: 2780 return err; 2781 } 2782 2783 static void dp_cleanup(void) 2784 { 2785 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2786 ovs_netdev_exit(); 2787 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2788 unregister_pernet_device(&ovs_net_ops); 2789 drop_reasons_unregister_subsys(SKB_DROP_REASON_SUBSYS_OPENVSWITCH); 2790 rcu_barrier(); 2791 ovs_vport_exit(); 2792 ovs_flow_exit(); 2793 ovs_internal_dev_rtnl_link_unregister(); 2794 action_fifos_exit(); 2795 } 2796 2797 module_init(dp_init); 2798 module_exit(dp_cleanup); 2799 2800 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2801 MODULE_LICENSE("GPL"); 2802 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY); 2803 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY); 2804 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY); 2805 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY); 2806 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY); 2807 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY); 2808