1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2007-2014 Nicira, Inc. 4 */ 5 6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7 8 #include <linux/init.h> 9 #include <linux/module.h> 10 #include <linux/if_arp.h> 11 #include <linux/if_vlan.h> 12 #include <linux/in.h> 13 #include <linux/ip.h> 14 #include <linux/jhash.h> 15 #include <linux/delay.h> 16 #include <linux/time.h> 17 #include <linux/etherdevice.h> 18 #include <linux/genetlink.h> 19 #include <linux/kernel.h> 20 #include <linux/kthread.h> 21 #include <linux/mutex.h> 22 #include <linux/percpu.h> 23 #include <linux/rcupdate.h> 24 #include <linux/tcp.h> 25 #include <linux/udp.h> 26 #include <linux/ethtool.h> 27 #include <linux/wait.h> 28 #include <asm/div64.h> 29 #include <linux/highmem.h> 30 #include <linux/netfilter_bridge.h> 31 #include <linux/netfilter_ipv4.h> 32 #include <linux/inetdevice.h> 33 #include <linux/list.h> 34 #include <linux/openvswitch.h> 35 #include <linux/rculist.h> 36 #include <linux/dmi.h> 37 #include <net/genetlink.h> 38 #include <net/net_namespace.h> 39 #include <net/netns/generic.h> 40 #include <net/pkt_cls.h> 41 42 #include "datapath.h" 43 #include "flow.h" 44 #include "flow_table.h" 45 #include "flow_netlink.h" 46 #include "meter.h" 47 #include "openvswitch_trace.h" 48 #include "vport-internal_dev.h" 49 #include "vport-netdev.h" 50 51 unsigned int ovs_net_id __read_mostly; 52 53 static struct genl_family dp_packet_genl_family; 54 static struct genl_family dp_flow_genl_family; 55 static struct genl_family dp_datapath_genl_family; 56 57 static const struct nla_policy flow_policy[]; 58 59 static const struct genl_multicast_group ovs_dp_flow_multicast_group = { 60 .name = OVS_FLOW_MCGROUP, 61 }; 62 63 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = { 64 .name = OVS_DATAPATH_MCGROUP, 65 }; 66 67 static const struct genl_multicast_group ovs_dp_vport_multicast_group = { 68 .name = OVS_VPORT_MCGROUP, 69 }; 70 71 /* Check if need to build a reply message. 72 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */ 73 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info, 74 unsigned int group) 75 { 76 return info->nlhdr->nlmsg_flags & NLM_F_ECHO || 77 genl_has_listeners(family, genl_info_net(info), group); 78 } 79 80 static void ovs_notify(struct genl_family *family, 81 struct sk_buff *skb, struct genl_info *info) 82 { 83 genl_notify(family, skb, info, 0, GFP_KERNEL); 84 } 85 86 /** 87 * DOC: Locking: 88 * 89 * All writes e.g. Writes to device state (add/remove datapath, port, set 90 * operations on vports, etc.), Writes to other state (flow table 91 * modifications, set miscellaneous datapath parameters, etc.) are protected 92 * by ovs_lock. 93 * 94 * Reads are protected by RCU. 95 * 96 * There are a few special cases (mostly stats) that have their own 97 * synchronization but they nest under all of above and don't interact with 98 * each other. 99 * 100 * The RTNL lock nests inside ovs_mutex. 101 */ 102 103 static DEFINE_MUTEX(ovs_mutex); 104 105 void ovs_lock(void) 106 { 107 mutex_lock(&ovs_mutex); 108 } 109 110 void ovs_unlock(void) 111 { 112 mutex_unlock(&ovs_mutex); 113 } 114 115 #ifdef CONFIG_LOCKDEP 116 int lockdep_ovsl_is_held(void) 117 { 118 if (debug_locks) 119 return lockdep_is_held(&ovs_mutex); 120 else 121 return 1; 122 } 123 #endif 124 125 static struct vport *new_vport(const struct vport_parms *); 126 static int queue_gso_packets(struct datapath *dp, struct sk_buff *, 127 const struct sw_flow_key *, 128 const struct dp_upcall_info *, 129 uint32_t cutlen); 130 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *, 131 const struct sw_flow_key *, 132 const struct dp_upcall_info *, 133 uint32_t cutlen); 134 135 static void ovs_dp_masks_rebalance(struct work_struct *work); 136 137 static int ovs_dp_set_upcall_portids(struct datapath *, const struct nlattr *); 138 139 /* Must be called with rcu_read_lock or ovs_mutex. */ 140 const char *ovs_dp_name(const struct datapath *dp) 141 { 142 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); 143 return ovs_vport_name(vport); 144 } 145 146 static int get_dpifindex(const struct datapath *dp) 147 { 148 struct vport *local; 149 int ifindex; 150 151 rcu_read_lock(); 152 153 local = ovs_vport_rcu(dp, OVSP_LOCAL); 154 if (local) 155 ifindex = local->dev->ifindex; 156 else 157 ifindex = 0; 158 159 rcu_read_unlock(); 160 161 return ifindex; 162 } 163 164 static void destroy_dp_rcu(struct rcu_head *rcu) 165 { 166 struct datapath *dp = container_of(rcu, struct datapath, rcu); 167 168 ovs_flow_tbl_destroy(&dp->table); 169 free_percpu(dp->stats_percpu); 170 kfree(dp->ports); 171 ovs_meters_exit(dp); 172 kfree(rcu_dereference_raw(dp->upcall_portids)); 173 kfree(dp); 174 } 175 176 static struct hlist_head *vport_hash_bucket(const struct datapath *dp, 177 u16 port_no) 178 { 179 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; 180 } 181 182 /* Called with ovs_mutex or RCU read lock. */ 183 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) 184 { 185 struct vport *vport; 186 struct hlist_head *head; 187 188 head = vport_hash_bucket(dp, port_no); 189 hlist_for_each_entry_rcu(vport, head, dp_hash_node, 190 lockdep_ovsl_is_held()) { 191 if (vport->port_no == port_no) 192 return vport; 193 } 194 return NULL; 195 } 196 197 /* Called with ovs_mutex. */ 198 static struct vport *new_vport(const struct vport_parms *parms) 199 { 200 struct vport *vport; 201 202 vport = ovs_vport_add(parms); 203 if (!IS_ERR(vport)) { 204 struct datapath *dp = parms->dp; 205 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); 206 207 hlist_add_head_rcu(&vport->dp_hash_node, head); 208 } 209 return vport; 210 } 211 212 static void ovs_vport_update_upcall_stats(struct sk_buff *skb, 213 const struct dp_upcall_info *upcall_info, 214 bool upcall_result) 215 { 216 struct vport *p = OVS_CB(skb)->input_vport; 217 struct vport_upcall_stats_percpu *stats; 218 219 if (upcall_info->cmd != OVS_PACKET_CMD_MISS && 220 upcall_info->cmd != OVS_PACKET_CMD_ACTION) 221 return; 222 223 stats = this_cpu_ptr(p->upcall_stats); 224 u64_stats_update_begin(&stats->syncp); 225 if (upcall_result) 226 u64_stats_inc(&stats->n_success); 227 else 228 u64_stats_inc(&stats->n_fail); 229 u64_stats_update_end(&stats->syncp); 230 } 231 232 void ovs_dp_detach_port(struct vport *p) 233 { 234 ASSERT_OVSL(); 235 236 /* First drop references to device. */ 237 hlist_del_rcu(&p->dp_hash_node); 238 239 /* Free percpu memory */ 240 free_percpu(p->upcall_stats); 241 242 /* Then destroy it. */ 243 ovs_vport_del(p); 244 } 245 246 /* Must be called with rcu_read_lock. */ 247 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key) 248 { 249 const struct vport *p = OVS_CB(skb)->input_vport; 250 struct datapath *dp = p->dp; 251 struct sw_flow *flow; 252 struct sw_flow_actions *sf_acts; 253 struct dp_stats_percpu *stats; 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 (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU) 271 upcall.portid = 272 ovs_dp_get_upcall_portid(dp, smp_processor_id()); 273 else 274 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 275 276 upcall.mru = OVS_CB(skb)->mru; 277 error = ovs_dp_upcall(dp, skb, key, &upcall, 0); 278 switch (error) { 279 case 0: 280 case -EAGAIN: 281 case -ERESTARTSYS: 282 case -EINTR: 283 consume_skb(skb); 284 break; 285 default: 286 kfree_skb(skb); 287 break; 288 } 289 stats_counter = &stats->n_missed; 290 goto out; 291 } 292 293 ovs_flow_stats_update(flow, key->tp.flags, skb); 294 sf_acts = rcu_dereference(flow->sf_acts); 295 error = ovs_execute_actions(dp, skb, sf_acts, key); 296 if (unlikely(error)) 297 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n", 298 ovs_dp_name(dp), error); 299 300 stats_counter = &stats->n_hit; 301 302 out: 303 /* Update datapath statistics. */ 304 u64_stats_update_begin(&stats->syncp); 305 (*stats_counter)++; 306 stats->n_mask_hit += n_mask_hit; 307 stats->n_cache_hit += n_cache_hit; 308 u64_stats_update_end(&stats->syncp); 309 } 310 311 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 312 const struct sw_flow_key *key, 313 const struct dp_upcall_info *upcall_info, 314 uint32_t cutlen) 315 { 316 struct dp_stats_percpu *stats; 317 int err; 318 319 if (trace_ovs_dp_upcall_enabled()) 320 trace_ovs_dp_upcall(dp, skb, key, upcall_info); 321 322 if (upcall_info->portid == 0) { 323 err = -ENOTCONN; 324 goto err; 325 } 326 327 if (!skb_is_gso(skb)) 328 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 329 else 330 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen); 331 332 ovs_vport_update_upcall_stats(skb, upcall_info, !err); 333 if (err) 334 goto err; 335 336 return 0; 337 338 err: 339 stats = this_cpu_ptr(dp->stats_percpu); 340 341 u64_stats_update_begin(&stats->syncp); 342 stats->n_lost++; 343 u64_stats_update_end(&stats->syncp); 344 345 return err; 346 } 347 348 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 349 const struct sw_flow_key *key, 350 const struct dp_upcall_info *upcall_info, 351 uint32_t cutlen) 352 { 353 unsigned int gso_type = skb_shinfo(skb)->gso_type; 354 struct sw_flow_key later_key; 355 struct sk_buff *segs, *nskb; 356 int err; 357 358 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET); 359 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 360 if (IS_ERR(segs)) 361 return PTR_ERR(segs); 362 if (segs == NULL) 363 return -EINVAL; 364 365 if (gso_type & SKB_GSO_UDP) { 366 /* The initial flow key extracted by ovs_flow_key_extract() 367 * in this case is for a first fragment, so we need to 368 * properly mark later fragments. 369 */ 370 later_key = *key; 371 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 372 } 373 374 /* Queue all of the segments. */ 375 skb_list_walk_safe(segs, skb, nskb) { 376 if (gso_type & SKB_GSO_UDP && skb != segs) 377 key = &later_key; 378 379 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 380 if (err) 381 break; 382 383 } 384 385 /* Free all of the segments. */ 386 skb_list_walk_safe(segs, skb, nskb) { 387 if (err) 388 kfree_skb(skb); 389 else 390 consume_skb(skb); 391 } 392 return err; 393 } 394 395 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, 396 unsigned int hdrlen, int actions_attrlen) 397 { 398 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 399 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 400 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */ 401 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */ 402 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */ 403 404 /* OVS_PACKET_ATTR_USERDATA */ 405 if (upcall_info->userdata) 406 size += NLA_ALIGN(upcall_info->userdata->nla_len); 407 408 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ 409 if (upcall_info->egress_tun_info) 410 size += nla_total_size(ovs_tun_key_attr_size()); 411 412 /* OVS_PACKET_ATTR_ACTIONS */ 413 if (upcall_info->actions_len) 414 size += nla_total_size(actions_attrlen); 415 416 /* OVS_PACKET_ATTR_MRU */ 417 if (upcall_info->mru) 418 size += nla_total_size(sizeof(upcall_info->mru)); 419 420 return size; 421 } 422 423 static void pad_packet(struct datapath *dp, struct sk_buff *skb) 424 { 425 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 426 size_t plen = NLA_ALIGN(skb->len) - skb->len; 427 428 if (plen > 0) 429 skb_put_zero(skb, plen); 430 } 431 } 432 433 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 434 const struct sw_flow_key *key, 435 const struct dp_upcall_info *upcall_info, 436 uint32_t cutlen) 437 { 438 struct ovs_header *upcall; 439 struct sk_buff *nskb = NULL; 440 struct sk_buff *user_skb = NULL; /* to be queued to userspace */ 441 struct nlattr *nla; 442 size_t len; 443 unsigned int hlen; 444 int err, dp_ifindex; 445 u64 hash; 446 447 dp_ifindex = get_dpifindex(dp); 448 if (!dp_ifindex) 449 return -ENODEV; 450 451 if (skb_vlan_tag_present(skb)) { 452 nskb = skb_clone(skb, GFP_ATOMIC); 453 if (!nskb) 454 return -ENOMEM; 455 456 nskb = __vlan_hwaccel_push_inside(nskb); 457 if (!nskb) 458 return -ENOMEM; 459 460 skb = nskb; 461 } 462 463 if (nla_attr_size(skb->len) > USHRT_MAX) { 464 err = -EFBIG; 465 goto out; 466 } 467 468 /* Complete checksum if needed */ 469 if (skb->ip_summed == CHECKSUM_PARTIAL && 470 (err = skb_csum_hwoffload_help(skb, 0))) 471 goto out; 472 473 /* Older versions of OVS user space enforce alignment of the last 474 * Netlink attribute to NLA_ALIGNTO which would require extensive 475 * padding logic. Only perform zerocopy if padding is not required. 476 */ 477 if (dp->user_features & OVS_DP_F_UNALIGNED) 478 hlen = skb_zerocopy_headlen(skb); 479 else 480 hlen = skb->len; 481 482 len = upcall_msg_size(upcall_info, hlen - cutlen, 483 OVS_CB(skb)->acts_origlen); 484 user_skb = genlmsg_new(len, GFP_ATOMIC); 485 if (!user_skb) { 486 err = -ENOMEM; 487 goto out; 488 } 489 490 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 491 0, upcall_info->cmd); 492 if (!upcall) { 493 err = -EINVAL; 494 goto out; 495 } 496 upcall->dp_ifindex = dp_ifindex; 497 498 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); 499 if (err) 500 goto out; 501 502 if (upcall_info->userdata) 503 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 504 nla_len(upcall_info->userdata), 505 nla_data(upcall_info->userdata)); 506 507 if (upcall_info->egress_tun_info) { 508 nla = nla_nest_start_noflag(user_skb, 509 OVS_PACKET_ATTR_EGRESS_TUN_KEY); 510 if (!nla) { 511 err = -EMSGSIZE; 512 goto out; 513 } 514 err = ovs_nla_put_tunnel_info(user_skb, 515 upcall_info->egress_tun_info); 516 if (err) 517 goto out; 518 519 nla_nest_end(user_skb, nla); 520 } 521 522 if (upcall_info->actions_len) { 523 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS); 524 if (!nla) { 525 err = -EMSGSIZE; 526 goto out; 527 } 528 err = ovs_nla_put_actions(upcall_info->actions, 529 upcall_info->actions_len, 530 user_skb); 531 if (!err) 532 nla_nest_end(user_skb, nla); 533 else 534 nla_nest_cancel(user_skb, nla); 535 } 536 537 /* Add OVS_PACKET_ATTR_MRU */ 538 if (upcall_info->mru && 539 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) { 540 err = -ENOBUFS; 541 goto out; 542 } 543 544 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */ 545 if (cutlen > 0 && 546 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) { 547 err = -ENOBUFS; 548 goto out; 549 } 550 551 /* Add OVS_PACKET_ATTR_HASH */ 552 hash = skb_get_hash_raw(skb); 553 if (skb->sw_hash) 554 hash |= OVS_PACKET_HASH_SW_BIT; 555 556 if (skb->l4_hash) 557 hash |= OVS_PACKET_HASH_L4_BIT; 558 559 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) { 560 err = -ENOBUFS; 561 goto out; 562 } 563 564 /* Only reserve room for attribute header, packet data is added 565 * in skb_zerocopy() */ 566 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 567 err = -ENOBUFS; 568 goto out; 569 } 570 nla->nla_len = nla_attr_size(skb->len - cutlen); 571 572 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen); 573 if (err) 574 goto out; 575 576 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 577 pad_packet(dp, user_skb); 578 579 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 580 581 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 582 user_skb = NULL; 583 out: 584 if (err) 585 skb_tx_error(skb); 586 consume_skb(user_skb); 587 consume_skb(nskb); 588 589 return err; 590 } 591 592 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 593 { 594 struct ovs_header *ovs_header = info->userhdr; 595 struct net *net = sock_net(skb->sk); 596 struct nlattr **a = info->attrs; 597 struct sw_flow_actions *acts; 598 struct sk_buff *packet; 599 struct sw_flow *flow; 600 struct sw_flow_actions *sf_acts; 601 struct datapath *dp; 602 struct vport *input_vport; 603 u16 mru = 0; 604 u64 hash; 605 int len; 606 int err; 607 bool log = !a[OVS_PACKET_ATTR_PROBE]; 608 609 err = -EINVAL; 610 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 611 !a[OVS_PACKET_ATTR_ACTIONS]) 612 goto err; 613 614 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 615 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 616 err = -ENOMEM; 617 if (!packet) 618 goto err; 619 skb_reserve(packet, NET_IP_ALIGN); 620 621 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 622 623 /* Set packet's mru */ 624 if (a[OVS_PACKET_ATTR_MRU]) { 625 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]); 626 packet->ignore_df = 1; 627 } 628 OVS_CB(packet)->mru = mru; 629 630 if (a[OVS_PACKET_ATTR_HASH]) { 631 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]); 632 633 __skb_set_hash(packet, hash & 0xFFFFFFFFULL, 634 !!(hash & OVS_PACKET_HASH_SW_BIT), 635 !!(hash & OVS_PACKET_HASH_L4_BIT)); 636 } 637 638 /* Build an sw_flow for sending this packet. */ 639 flow = ovs_flow_alloc(); 640 err = PTR_ERR(flow); 641 if (IS_ERR(flow)) 642 goto err_kfree_skb; 643 644 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY], 645 packet, &flow->key, log); 646 if (err) 647 goto err_flow_free; 648 649 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS], 650 &flow->key, &acts, log); 651 if (err) 652 goto err_flow_free; 653 654 rcu_assign_pointer(flow->sf_acts, acts); 655 packet->priority = flow->key.phy.priority; 656 packet->mark = flow->key.phy.skb_mark; 657 658 rcu_read_lock(); 659 dp = get_dp_rcu(net, ovs_header->dp_ifindex); 660 err = -ENODEV; 661 if (!dp) 662 goto err_unlock; 663 664 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 665 if (!input_vport) 666 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 667 668 if (!input_vport) 669 goto err_unlock; 670 671 packet->dev = input_vport->dev; 672 OVS_CB(packet)->input_vport = input_vport; 673 sf_acts = rcu_dereference(flow->sf_acts); 674 675 local_bh_disable(); 676 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); 677 local_bh_enable(); 678 rcu_read_unlock(); 679 680 ovs_flow_free(flow, false); 681 return err; 682 683 err_unlock: 684 rcu_read_unlock(); 685 err_flow_free: 686 ovs_flow_free(flow, false); 687 err_kfree_skb: 688 kfree_skb(packet); 689 err: 690 return err; 691 } 692 693 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 694 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 695 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 696 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 697 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, 698 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, 699 [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 }, 700 }; 701 702 static const struct genl_small_ops dp_packet_genl_ops[] = { 703 { .cmd = OVS_PACKET_CMD_EXECUTE, 704 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 705 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 706 .doit = ovs_packet_cmd_execute 707 } 708 }; 709 710 static struct genl_family dp_packet_genl_family __ro_after_init = { 711 .hdrsize = sizeof(struct ovs_header), 712 .name = OVS_PACKET_FAMILY, 713 .version = OVS_PACKET_VERSION, 714 .maxattr = OVS_PACKET_ATTR_MAX, 715 .policy = packet_policy, 716 .netnsok = true, 717 .parallel_ops = true, 718 .small_ops = dp_packet_genl_ops, 719 .n_small_ops = ARRAY_SIZE(dp_packet_genl_ops), 720 .resv_start_op = OVS_PACKET_CMD_EXECUTE + 1, 721 .module = THIS_MODULE, 722 }; 723 724 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 725 struct ovs_dp_megaflow_stats *mega_stats) 726 { 727 int i; 728 729 memset(mega_stats, 0, sizeof(*mega_stats)); 730 731 stats->n_flows = ovs_flow_tbl_count(&dp->table); 732 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 733 734 stats->n_hit = stats->n_missed = stats->n_lost = 0; 735 736 for_each_possible_cpu(i) { 737 const struct dp_stats_percpu *percpu_stats; 738 struct dp_stats_percpu local_stats; 739 unsigned int start; 740 741 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 742 743 do { 744 start = u64_stats_fetch_begin(&percpu_stats->syncp); 745 local_stats = *percpu_stats; 746 } while (u64_stats_fetch_retry(&percpu_stats->syncp, start)); 747 748 stats->n_hit += local_stats.n_hit; 749 stats->n_missed += local_stats.n_missed; 750 stats->n_lost += local_stats.n_lost; 751 mega_stats->n_mask_hit += local_stats.n_mask_hit; 752 mega_stats->n_cache_hit += local_stats.n_cache_hit; 753 } 754 } 755 756 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) 757 { 758 return ovs_identifier_is_ufid(sfid) && 759 !(ufid_flags & OVS_UFID_F_OMIT_KEY); 760 } 761 762 static bool should_fill_mask(uint32_t ufid_flags) 763 { 764 return !(ufid_flags & OVS_UFID_F_OMIT_MASK); 765 } 766 767 static bool should_fill_actions(uint32_t ufid_flags) 768 { 769 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); 770 } 771 772 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, 773 const struct sw_flow_id *sfid, 774 uint32_t ufid_flags) 775 { 776 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); 777 778 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback 779 * see ovs_nla_put_identifier() 780 */ 781 if (sfid && ovs_identifier_is_ufid(sfid)) 782 len += nla_total_size(sfid->ufid_len); 783 else 784 len += nla_total_size(ovs_key_attr_size()); 785 786 /* OVS_FLOW_ATTR_KEY */ 787 if (!sfid || should_fill_key(sfid, ufid_flags)) 788 len += nla_total_size(ovs_key_attr_size()); 789 790 /* OVS_FLOW_ATTR_MASK */ 791 if (should_fill_mask(ufid_flags)) 792 len += nla_total_size(ovs_key_attr_size()); 793 794 /* OVS_FLOW_ATTR_ACTIONS */ 795 if (should_fill_actions(ufid_flags)) 796 len += nla_total_size(acts->orig_len); 797 798 return len 799 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 800 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 801 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */ 802 } 803 804 /* Called with ovs_mutex or RCU read lock. */ 805 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 806 struct sk_buff *skb) 807 { 808 struct ovs_flow_stats stats; 809 __be16 tcp_flags; 810 unsigned long used; 811 812 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 813 814 if (used && 815 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used), 816 OVS_FLOW_ATTR_PAD)) 817 return -EMSGSIZE; 818 819 if (stats.n_packets && 820 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS, 821 sizeof(struct ovs_flow_stats), &stats, 822 OVS_FLOW_ATTR_PAD)) 823 return -EMSGSIZE; 824 825 if ((u8)ntohs(tcp_flags) && 826 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 827 return -EMSGSIZE; 828 829 return 0; 830 } 831 832 /* Called with ovs_mutex or RCU read lock. */ 833 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 834 struct sk_buff *skb, int skb_orig_len) 835 { 836 struct nlattr *start; 837 int err; 838 839 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 840 * this is the first flow to be dumped into 'skb'. This is unusual for 841 * Netlink but individual action lists can be longer than 842 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 843 * The userspace caller can always fetch the actions separately if it 844 * really wants them. (Most userspace callers in fact don't care.) 845 * 846 * This can only fail for dump operations because the skb is always 847 * properly sized for single flows. 848 */ 849 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS); 850 if (start) { 851 const struct sw_flow_actions *sf_acts; 852 853 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 854 err = ovs_nla_put_actions(sf_acts->actions, 855 sf_acts->actions_len, skb); 856 857 if (!err) 858 nla_nest_end(skb, start); 859 else { 860 if (skb_orig_len) 861 return err; 862 863 nla_nest_cancel(skb, start); 864 } 865 } else if (skb_orig_len) { 866 return -EMSGSIZE; 867 } 868 869 return 0; 870 } 871 872 /* Called with ovs_mutex or RCU read lock. */ 873 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 874 struct sk_buff *skb, u32 portid, 875 u32 seq, u32 flags, u8 cmd, u32 ufid_flags) 876 { 877 const int skb_orig_len = skb->len; 878 struct ovs_header *ovs_header; 879 int err; 880 881 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 882 flags, cmd); 883 if (!ovs_header) 884 return -EMSGSIZE; 885 886 ovs_header->dp_ifindex = dp_ifindex; 887 888 err = ovs_nla_put_identifier(flow, skb); 889 if (err) 890 goto error; 891 892 if (should_fill_key(&flow->id, ufid_flags)) { 893 err = ovs_nla_put_masked_key(flow, skb); 894 if (err) 895 goto error; 896 } 897 898 if (should_fill_mask(ufid_flags)) { 899 err = ovs_nla_put_mask(flow, skb); 900 if (err) 901 goto error; 902 } 903 904 err = ovs_flow_cmd_fill_stats(flow, skb); 905 if (err) 906 goto error; 907 908 if (should_fill_actions(ufid_flags)) { 909 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 910 if (err) 911 goto error; 912 } 913 914 genlmsg_end(skb, ovs_header); 915 return 0; 916 917 error: 918 genlmsg_cancel(skb, ovs_header); 919 return err; 920 } 921 922 /* May not be called with RCU read lock. */ 923 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 924 const struct sw_flow_id *sfid, 925 struct genl_info *info, 926 bool always, 927 uint32_t ufid_flags) 928 { 929 struct sk_buff *skb; 930 size_t len; 931 932 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 933 return NULL; 934 935 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); 936 skb = genlmsg_new(len, GFP_KERNEL); 937 if (!skb) 938 return ERR_PTR(-ENOMEM); 939 940 return skb; 941 } 942 943 /* Called with ovs_mutex. */ 944 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 945 int dp_ifindex, 946 struct genl_info *info, u8 cmd, 947 bool always, u32 ufid_flags) 948 { 949 struct sk_buff *skb; 950 int retval; 951 952 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), 953 &flow->id, info, always, ufid_flags); 954 if (IS_ERR_OR_NULL(skb)) 955 return skb; 956 957 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 958 info->snd_portid, info->snd_seq, 0, 959 cmd, ufid_flags); 960 if (WARN_ON_ONCE(retval < 0)) { 961 kfree_skb(skb); 962 skb = ERR_PTR(retval); 963 } 964 return skb; 965 } 966 967 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 968 { 969 struct net *net = sock_net(skb->sk); 970 struct nlattr **a = info->attrs; 971 struct ovs_header *ovs_header = info->userhdr; 972 struct sw_flow *flow = NULL, *new_flow; 973 struct sw_flow_mask mask; 974 struct sk_buff *reply; 975 struct datapath *dp; 976 struct sw_flow_actions *acts; 977 struct sw_flow_match match; 978 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 979 int error; 980 bool log = !a[OVS_FLOW_ATTR_PROBE]; 981 982 /* Must have key and actions. */ 983 error = -EINVAL; 984 if (!a[OVS_FLOW_ATTR_KEY]) { 985 OVS_NLERR(log, "Flow key attr not present in new flow."); 986 goto error; 987 } 988 if (!a[OVS_FLOW_ATTR_ACTIONS]) { 989 OVS_NLERR(log, "Flow actions attr not present in new flow."); 990 goto error; 991 } 992 993 /* Most of the time we need to allocate a new flow, do it before 994 * locking. 995 */ 996 new_flow = ovs_flow_alloc(); 997 if (IS_ERR(new_flow)) { 998 error = PTR_ERR(new_flow); 999 goto error; 1000 } 1001 1002 /* Extract key. */ 1003 ovs_match_init(&match, &new_flow->key, false, &mask); 1004 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1005 a[OVS_FLOW_ATTR_MASK], log); 1006 if (error) 1007 goto err_kfree_flow; 1008 1009 /* Extract flow identifier. */ 1010 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID], 1011 &new_flow->key, log); 1012 if (error) 1013 goto err_kfree_flow; 1014 1015 /* unmasked key is needed to match when ufid is not used. */ 1016 if (ovs_identifier_is_key(&new_flow->id)) 1017 match.key = new_flow->id.unmasked_key; 1018 1019 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask); 1020 1021 /* Validate actions. */ 1022 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS], 1023 &new_flow->key, &acts, log); 1024 if (error) { 1025 OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); 1026 goto err_kfree_flow; 1027 } 1028 1029 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false, 1030 ufid_flags); 1031 if (IS_ERR(reply)) { 1032 error = PTR_ERR(reply); 1033 goto err_kfree_acts; 1034 } 1035 1036 ovs_lock(); 1037 dp = get_dp(net, ovs_header->dp_ifindex); 1038 if (unlikely(!dp)) { 1039 error = -ENODEV; 1040 goto err_unlock_ovs; 1041 } 1042 1043 /* Check if this is a duplicate flow */ 1044 if (ovs_identifier_is_ufid(&new_flow->id)) 1045 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id); 1046 if (!flow) 1047 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key); 1048 if (likely(!flow)) { 1049 rcu_assign_pointer(new_flow->sf_acts, acts); 1050 1051 /* Put flow in bucket. */ 1052 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 1053 if (unlikely(error)) { 1054 acts = NULL; 1055 goto err_unlock_ovs; 1056 } 1057 1058 if (unlikely(reply)) { 1059 error = ovs_flow_cmd_fill_info(new_flow, 1060 ovs_header->dp_ifindex, 1061 reply, info->snd_portid, 1062 info->snd_seq, 0, 1063 OVS_FLOW_CMD_NEW, 1064 ufid_flags); 1065 BUG_ON(error < 0); 1066 } 1067 ovs_unlock(); 1068 } else { 1069 struct sw_flow_actions *old_acts; 1070 1071 /* Bail out if we're not allowed to modify an existing flow. 1072 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 1073 * because Generic Netlink treats the latter as a dump 1074 * request. We also accept NLM_F_EXCL in case that bug ever 1075 * gets fixed. 1076 */ 1077 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 1078 | NLM_F_EXCL))) { 1079 error = -EEXIST; 1080 goto err_unlock_ovs; 1081 } 1082 /* The flow identifier has to be the same for flow updates. 1083 * Look for any overlapping flow. 1084 */ 1085 if (unlikely(!ovs_flow_cmp(flow, &match))) { 1086 if (ovs_identifier_is_key(&flow->id)) 1087 flow = ovs_flow_tbl_lookup_exact(&dp->table, 1088 &match); 1089 else /* UFID matches but key is different */ 1090 flow = NULL; 1091 if (!flow) { 1092 error = -ENOENT; 1093 goto err_unlock_ovs; 1094 } 1095 } 1096 /* Update actions. */ 1097 old_acts = ovsl_dereference(flow->sf_acts); 1098 rcu_assign_pointer(flow->sf_acts, acts); 1099 1100 if (unlikely(reply)) { 1101 error = ovs_flow_cmd_fill_info(flow, 1102 ovs_header->dp_ifindex, 1103 reply, info->snd_portid, 1104 info->snd_seq, 0, 1105 OVS_FLOW_CMD_NEW, 1106 ufid_flags); 1107 BUG_ON(error < 0); 1108 } 1109 ovs_unlock(); 1110 1111 ovs_nla_free_flow_actions_rcu(old_acts); 1112 ovs_flow_free(new_flow, false); 1113 } 1114 1115 if (reply) 1116 ovs_notify(&dp_flow_genl_family, reply, info); 1117 return 0; 1118 1119 err_unlock_ovs: 1120 ovs_unlock(); 1121 kfree_skb(reply); 1122 err_kfree_acts: 1123 ovs_nla_free_flow_actions(acts); 1124 err_kfree_flow: 1125 ovs_flow_free(new_flow, false); 1126 error: 1127 return error; 1128 } 1129 1130 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ 1131 static noinline_for_stack 1132 struct sw_flow_actions *get_flow_actions(struct net *net, 1133 const struct nlattr *a, 1134 const struct sw_flow_key *key, 1135 const struct sw_flow_mask *mask, 1136 bool log) 1137 { 1138 struct sw_flow_actions *acts; 1139 struct sw_flow_key masked_key; 1140 int error; 1141 1142 ovs_flow_mask_key(&masked_key, key, true, mask); 1143 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log); 1144 if (error) { 1145 OVS_NLERR(log, 1146 "Actions may not be safe on all matching packets"); 1147 return ERR_PTR(error); 1148 } 1149 1150 return acts; 1151 } 1152 1153 /* Factor out match-init and action-copy to avoid 1154 * "Wframe-larger-than=1024" warning. Because mask is only 1155 * used to get actions, we new a function to save some 1156 * stack space. 1157 * 1158 * If there are not key and action attrs, we return 0 1159 * directly. In the case, the caller will also not use the 1160 * match as before. If there is action attr, we try to get 1161 * actions and save them to *acts. Before returning from 1162 * the function, we reset the match->mask pointer. Because 1163 * we should not to return match object with dangling reference 1164 * to mask. 1165 * */ 1166 static noinline_for_stack int 1167 ovs_nla_init_match_and_action(struct net *net, 1168 struct sw_flow_match *match, 1169 struct sw_flow_key *key, 1170 struct nlattr **a, 1171 struct sw_flow_actions **acts, 1172 bool log) 1173 { 1174 struct sw_flow_mask mask; 1175 int error = 0; 1176 1177 if (a[OVS_FLOW_ATTR_KEY]) { 1178 ovs_match_init(match, key, true, &mask); 1179 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY], 1180 a[OVS_FLOW_ATTR_MASK], log); 1181 if (error) 1182 goto error; 1183 } 1184 1185 if (a[OVS_FLOW_ATTR_ACTIONS]) { 1186 if (!a[OVS_FLOW_ATTR_KEY]) { 1187 OVS_NLERR(log, 1188 "Flow key attribute not present in set flow."); 1189 error = -EINVAL; 1190 goto error; 1191 } 1192 1193 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key, 1194 &mask, log); 1195 if (IS_ERR(*acts)) { 1196 error = PTR_ERR(*acts); 1197 goto error; 1198 } 1199 } 1200 1201 /* On success, error is 0. */ 1202 error: 1203 match->mask = NULL; 1204 return error; 1205 } 1206 1207 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 1208 { 1209 struct net *net = sock_net(skb->sk); 1210 struct nlattr **a = info->attrs; 1211 struct ovs_header *ovs_header = info->userhdr; 1212 struct sw_flow_key key; 1213 struct sw_flow *flow; 1214 struct sk_buff *reply = NULL; 1215 struct datapath *dp; 1216 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 1217 struct sw_flow_match match; 1218 struct sw_flow_id sfid; 1219 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1220 int error = 0; 1221 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1222 bool ufid_present; 1223 1224 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); 1225 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) { 1226 OVS_NLERR(log, 1227 "Flow set message rejected, Key attribute missing."); 1228 return -EINVAL; 1229 } 1230 1231 error = ovs_nla_init_match_and_action(net, &match, &key, a, 1232 &acts, log); 1233 if (error) 1234 goto error; 1235 1236 if (acts) { 1237 /* Can allocate before locking if have acts. */ 1238 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false, 1239 ufid_flags); 1240 if (IS_ERR(reply)) { 1241 error = PTR_ERR(reply); 1242 goto err_kfree_acts; 1243 } 1244 } 1245 1246 ovs_lock(); 1247 dp = get_dp(net, ovs_header->dp_ifindex); 1248 if (unlikely(!dp)) { 1249 error = -ENODEV; 1250 goto err_unlock_ovs; 1251 } 1252 /* Check that the flow exists. */ 1253 if (ufid_present) 1254 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid); 1255 else 1256 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1257 if (unlikely(!flow)) { 1258 error = -ENOENT; 1259 goto err_unlock_ovs; 1260 } 1261 1262 /* Update actions, if present. */ 1263 if (likely(acts)) { 1264 old_acts = ovsl_dereference(flow->sf_acts); 1265 rcu_assign_pointer(flow->sf_acts, acts); 1266 1267 if (unlikely(reply)) { 1268 error = ovs_flow_cmd_fill_info(flow, 1269 ovs_header->dp_ifindex, 1270 reply, info->snd_portid, 1271 info->snd_seq, 0, 1272 OVS_FLOW_CMD_SET, 1273 ufid_flags); 1274 BUG_ON(error < 0); 1275 } 1276 } else { 1277 /* Could not alloc without acts before locking. */ 1278 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1279 info, OVS_FLOW_CMD_SET, false, 1280 ufid_flags); 1281 1282 if (IS_ERR(reply)) { 1283 error = PTR_ERR(reply); 1284 goto err_unlock_ovs; 1285 } 1286 } 1287 1288 /* Clear stats. */ 1289 if (a[OVS_FLOW_ATTR_CLEAR]) 1290 ovs_flow_stats_clear(flow); 1291 ovs_unlock(); 1292 1293 if (reply) 1294 ovs_notify(&dp_flow_genl_family, reply, info); 1295 if (old_acts) 1296 ovs_nla_free_flow_actions_rcu(old_acts); 1297 1298 return 0; 1299 1300 err_unlock_ovs: 1301 ovs_unlock(); 1302 kfree_skb(reply); 1303 err_kfree_acts: 1304 ovs_nla_free_flow_actions(acts); 1305 error: 1306 return error; 1307 } 1308 1309 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1310 { 1311 struct nlattr **a = info->attrs; 1312 struct ovs_header *ovs_header = info->userhdr; 1313 struct net *net = sock_net(skb->sk); 1314 struct sw_flow_key key; 1315 struct sk_buff *reply; 1316 struct sw_flow *flow; 1317 struct datapath *dp; 1318 struct sw_flow_match match; 1319 struct sw_flow_id ufid; 1320 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1321 int err = 0; 1322 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1323 bool ufid_present; 1324 1325 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1326 if (a[OVS_FLOW_ATTR_KEY]) { 1327 ovs_match_init(&match, &key, true, NULL); 1328 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL, 1329 log); 1330 } else if (!ufid_present) { 1331 OVS_NLERR(log, 1332 "Flow get message rejected, Key attribute missing."); 1333 err = -EINVAL; 1334 } 1335 if (err) 1336 return err; 1337 1338 ovs_lock(); 1339 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1340 if (!dp) { 1341 err = -ENODEV; 1342 goto unlock; 1343 } 1344 1345 if (ufid_present) 1346 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1347 else 1348 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1349 if (!flow) { 1350 err = -ENOENT; 1351 goto unlock; 1352 } 1353 1354 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1355 OVS_FLOW_CMD_GET, true, ufid_flags); 1356 if (IS_ERR(reply)) { 1357 err = PTR_ERR(reply); 1358 goto unlock; 1359 } 1360 1361 ovs_unlock(); 1362 return genlmsg_reply(reply, info); 1363 unlock: 1364 ovs_unlock(); 1365 return err; 1366 } 1367 1368 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1369 { 1370 struct nlattr **a = info->attrs; 1371 struct ovs_header *ovs_header = info->userhdr; 1372 struct net *net = sock_net(skb->sk); 1373 struct sw_flow_key key; 1374 struct sk_buff *reply; 1375 struct sw_flow *flow = NULL; 1376 struct datapath *dp; 1377 struct sw_flow_match match; 1378 struct sw_flow_id ufid; 1379 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1380 int err; 1381 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1382 bool ufid_present; 1383 1384 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1385 if (a[OVS_FLOW_ATTR_KEY]) { 1386 ovs_match_init(&match, &key, true, NULL); 1387 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1388 NULL, log); 1389 if (unlikely(err)) 1390 return err; 1391 } 1392 1393 ovs_lock(); 1394 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1395 if (unlikely(!dp)) { 1396 err = -ENODEV; 1397 goto unlock; 1398 } 1399 1400 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) { 1401 err = ovs_flow_tbl_flush(&dp->table); 1402 goto unlock; 1403 } 1404 1405 if (ufid_present) 1406 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1407 else 1408 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1409 if (unlikely(!flow)) { 1410 err = -ENOENT; 1411 goto unlock; 1412 } 1413 1414 ovs_flow_tbl_remove(&dp->table, flow); 1415 ovs_unlock(); 1416 1417 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1418 &flow->id, info, false, ufid_flags); 1419 if (likely(reply)) { 1420 if (!IS_ERR(reply)) { 1421 rcu_read_lock(); /*To keep RCU checker happy. */ 1422 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1423 reply, info->snd_portid, 1424 info->snd_seq, 0, 1425 OVS_FLOW_CMD_DEL, 1426 ufid_flags); 1427 rcu_read_unlock(); 1428 if (WARN_ON_ONCE(err < 0)) { 1429 kfree_skb(reply); 1430 goto out_free; 1431 } 1432 1433 ovs_notify(&dp_flow_genl_family, reply, info); 1434 } else { 1435 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, 1436 PTR_ERR(reply)); 1437 } 1438 } 1439 1440 out_free: 1441 ovs_flow_free(flow, true); 1442 return 0; 1443 unlock: 1444 ovs_unlock(); 1445 return err; 1446 } 1447 1448 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1449 { 1450 struct nlattr *a[__OVS_FLOW_ATTR_MAX]; 1451 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1452 struct table_instance *ti; 1453 struct datapath *dp; 1454 u32 ufid_flags; 1455 int err; 1456 1457 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a, 1458 OVS_FLOW_ATTR_MAX, flow_policy, NULL); 1459 if (err) 1460 return err; 1461 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1462 1463 rcu_read_lock(); 1464 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1465 if (!dp) { 1466 rcu_read_unlock(); 1467 return -ENODEV; 1468 } 1469 1470 ti = rcu_dereference(dp->table.ti); 1471 for (;;) { 1472 struct sw_flow *flow; 1473 u32 bucket, obj; 1474 1475 bucket = cb->args[0]; 1476 obj = cb->args[1]; 1477 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1478 if (!flow) 1479 break; 1480 1481 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1482 NETLINK_CB(cb->skb).portid, 1483 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1484 OVS_FLOW_CMD_GET, ufid_flags) < 0) 1485 break; 1486 1487 cb->args[0] = bucket; 1488 cb->args[1] = obj; 1489 } 1490 rcu_read_unlock(); 1491 return skb->len; 1492 } 1493 1494 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1495 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1496 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1497 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1498 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1499 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1500 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, 1501 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, 1502 }; 1503 1504 static const struct genl_small_ops dp_flow_genl_ops[] = { 1505 { .cmd = OVS_FLOW_CMD_NEW, 1506 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1507 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1508 .doit = ovs_flow_cmd_new 1509 }, 1510 { .cmd = OVS_FLOW_CMD_DEL, 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_del 1514 }, 1515 { .cmd = OVS_FLOW_CMD_GET, 1516 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1517 .flags = 0, /* OK for unprivileged users. */ 1518 .doit = ovs_flow_cmd_get, 1519 .dumpit = ovs_flow_cmd_dump 1520 }, 1521 { .cmd = OVS_FLOW_CMD_SET, 1522 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1523 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1524 .doit = ovs_flow_cmd_set, 1525 }, 1526 }; 1527 1528 static struct genl_family dp_flow_genl_family __ro_after_init = { 1529 .hdrsize = sizeof(struct ovs_header), 1530 .name = OVS_FLOW_FAMILY, 1531 .version = OVS_FLOW_VERSION, 1532 .maxattr = OVS_FLOW_ATTR_MAX, 1533 .policy = flow_policy, 1534 .netnsok = true, 1535 .parallel_ops = true, 1536 .small_ops = dp_flow_genl_ops, 1537 .n_small_ops = ARRAY_SIZE(dp_flow_genl_ops), 1538 .resv_start_op = OVS_FLOW_CMD_SET + 1, 1539 .mcgrps = &ovs_dp_flow_multicast_group, 1540 .n_mcgrps = 1, 1541 .module = THIS_MODULE, 1542 }; 1543 1544 static size_t ovs_dp_cmd_msg_size(void) 1545 { 1546 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1547 1548 msgsize += nla_total_size(IFNAMSIZ); 1549 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats)); 1550 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats)); 1551 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1552 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */ 1553 msgsize += nla_total_size(sizeof(u32) * nr_cpu_ids); /* OVS_DP_ATTR_PER_CPU_PIDS */ 1554 1555 return msgsize; 1556 } 1557 1558 /* Called with ovs_mutex. */ 1559 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1560 u32 portid, u32 seq, u32 flags, u8 cmd) 1561 { 1562 struct ovs_header *ovs_header; 1563 struct ovs_dp_stats dp_stats; 1564 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1565 struct dp_nlsk_pids *pids = ovsl_dereference(dp->upcall_portids); 1566 int err, pids_len; 1567 1568 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1569 flags, cmd); 1570 if (!ovs_header) 1571 goto error; 1572 1573 ovs_header->dp_ifindex = get_dpifindex(dp); 1574 1575 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1576 if (err) 1577 goto nla_put_failure; 1578 1579 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1580 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1581 &dp_stats, OVS_DP_ATTR_PAD)) 1582 goto nla_put_failure; 1583 1584 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1585 sizeof(struct ovs_dp_megaflow_stats), 1586 &dp_megaflow_stats, OVS_DP_ATTR_PAD)) 1587 goto nla_put_failure; 1588 1589 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1590 goto nla_put_failure; 1591 1592 if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE, 1593 ovs_flow_tbl_masks_cache_size(&dp->table))) 1594 goto nla_put_failure; 1595 1596 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU && pids) { 1597 pids_len = min(pids->n_pids, nr_cpu_ids) * sizeof(u32); 1598 if (nla_put(skb, OVS_DP_ATTR_PER_CPU_PIDS, pids_len, &pids->pids)) 1599 goto nla_put_failure; 1600 } 1601 1602 genlmsg_end(skb, ovs_header); 1603 return 0; 1604 1605 nla_put_failure: 1606 genlmsg_cancel(skb, ovs_header); 1607 error: 1608 return -EMSGSIZE; 1609 } 1610 1611 static struct sk_buff *ovs_dp_cmd_alloc_info(void) 1612 { 1613 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL); 1614 } 1615 1616 /* Called with rcu_read_lock or ovs_mutex. */ 1617 static struct datapath *lookup_datapath(struct net *net, 1618 const struct ovs_header *ovs_header, 1619 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1620 { 1621 struct datapath *dp; 1622 1623 if (!a[OVS_DP_ATTR_NAME]) 1624 dp = get_dp(net, ovs_header->dp_ifindex); 1625 else { 1626 struct vport *vport; 1627 1628 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1629 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1630 } 1631 return dp ? dp : ERR_PTR(-ENODEV); 1632 } 1633 1634 static void ovs_dp_reset_user_features(struct sk_buff *skb, 1635 struct genl_info *info) 1636 { 1637 struct datapath *dp; 1638 1639 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, 1640 info->attrs); 1641 if (IS_ERR(dp)) 1642 return; 1643 1644 pr_warn("%s: Dropping previously announced user features\n", 1645 ovs_dp_name(dp)); 1646 dp->user_features = 0; 1647 } 1648 1649 static int ovs_dp_set_upcall_portids(struct datapath *dp, 1650 const struct nlattr *ids) 1651 { 1652 struct dp_nlsk_pids *old, *dp_nlsk_pids; 1653 1654 if (!nla_len(ids) || nla_len(ids) % sizeof(u32)) 1655 return -EINVAL; 1656 1657 old = ovsl_dereference(dp->upcall_portids); 1658 1659 dp_nlsk_pids = kmalloc(sizeof(*dp_nlsk_pids) + nla_len(ids), 1660 GFP_KERNEL); 1661 if (!dp_nlsk_pids) 1662 return -ENOMEM; 1663 1664 dp_nlsk_pids->n_pids = nla_len(ids) / sizeof(u32); 1665 nla_memcpy(dp_nlsk_pids->pids, ids, nla_len(ids)); 1666 1667 rcu_assign_pointer(dp->upcall_portids, dp_nlsk_pids); 1668 1669 kfree_rcu(old, rcu); 1670 1671 return 0; 1672 } 1673 1674 u32 ovs_dp_get_upcall_portid(const struct datapath *dp, uint32_t cpu_id) 1675 { 1676 struct dp_nlsk_pids *dp_nlsk_pids; 1677 1678 dp_nlsk_pids = rcu_dereference(dp->upcall_portids); 1679 1680 if (dp_nlsk_pids) { 1681 if (cpu_id < dp_nlsk_pids->n_pids) { 1682 return dp_nlsk_pids->pids[cpu_id]; 1683 } else if (dp_nlsk_pids->n_pids > 0 && 1684 cpu_id >= dp_nlsk_pids->n_pids) { 1685 /* If the number of netlink PIDs is mismatched with 1686 * the number of CPUs as seen by the kernel, log this 1687 * and send the upcall to an arbitrary socket (0) in 1688 * order to not drop packets 1689 */ 1690 pr_info_ratelimited("cpu_id mismatch with handler threads"); 1691 return dp_nlsk_pids->pids[cpu_id % 1692 dp_nlsk_pids->n_pids]; 1693 } else { 1694 return 0; 1695 } 1696 } else { 1697 return 0; 1698 } 1699 } 1700 1701 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1702 { 1703 u32 user_features = 0, old_features = dp->user_features; 1704 int err; 1705 1706 if (a[OVS_DP_ATTR_USER_FEATURES]) { 1707 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1708 1709 if (user_features & ~(OVS_DP_F_VPORT_PIDS | 1710 OVS_DP_F_UNALIGNED | 1711 OVS_DP_F_TC_RECIRC_SHARING | 1712 OVS_DP_F_DISPATCH_UPCALL_PER_CPU)) 1713 return -EOPNOTSUPP; 1714 1715 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT) 1716 if (user_features & OVS_DP_F_TC_RECIRC_SHARING) 1717 return -EOPNOTSUPP; 1718 #endif 1719 } 1720 1721 if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) { 1722 int err; 1723 u32 cache_size; 1724 1725 cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]); 1726 err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size); 1727 if (err) 1728 return err; 1729 } 1730 1731 dp->user_features = user_features; 1732 1733 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU && 1734 a[OVS_DP_ATTR_PER_CPU_PIDS]) { 1735 /* Upcall Netlink Port IDs have been updated */ 1736 err = ovs_dp_set_upcall_portids(dp, 1737 a[OVS_DP_ATTR_PER_CPU_PIDS]); 1738 if (err) 1739 return err; 1740 } 1741 1742 if ((dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) && 1743 !(old_features & OVS_DP_F_TC_RECIRC_SHARING)) 1744 tc_skb_ext_tc_enable(); 1745 else if (!(dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) && 1746 (old_features & OVS_DP_F_TC_RECIRC_SHARING)) 1747 tc_skb_ext_tc_disable(); 1748 1749 return 0; 1750 } 1751 1752 static int ovs_dp_stats_init(struct datapath *dp) 1753 { 1754 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1755 if (!dp->stats_percpu) 1756 return -ENOMEM; 1757 1758 return 0; 1759 } 1760 1761 static int ovs_dp_vport_init(struct datapath *dp) 1762 { 1763 int i; 1764 1765 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS, 1766 sizeof(struct hlist_head), 1767 GFP_KERNEL); 1768 if (!dp->ports) 1769 return -ENOMEM; 1770 1771 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1772 INIT_HLIST_HEAD(&dp->ports[i]); 1773 1774 return 0; 1775 } 1776 1777 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1778 { 1779 struct nlattr **a = info->attrs; 1780 struct vport_parms parms; 1781 struct sk_buff *reply; 1782 struct datapath *dp; 1783 struct vport *vport; 1784 struct ovs_net *ovs_net; 1785 int err; 1786 1787 err = -EINVAL; 1788 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1789 goto err; 1790 1791 reply = ovs_dp_cmd_alloc_info(); 1792 if (!reply) 1793 return -ENOMEM; 1794 1795 err = -ENOMEM; 1796 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1797 if (dp == NULL) 1798 goto err_destroy_reply; 1799 1800 ovs_dp_set_net(dp, sock_net(skb->sk)); 1801 1802 /* Allocate table. */ 1803 err = ovs_flow_tbl_init(&dp->table); 1804 if (err) 1805 goto err_destroy_dp; 1806 1807 err = ovs_dp_stats_init(dp); 1808 if (err) 1809 goto err_destroy_table; 1810 1811 err = ovs_dp_vport_init(dp); 1812 if (err) 1813 goto err_destroy_stats; 1814 1815 err = ovs_meters_init(dp); 1816 if (err) 1817 goto err_destroy_ports; 1818 1819 /* Set up our datapath device. */ 1820 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1821 parms.type = OVS_VPORT_TYPE_INTERNAL; 1822 parms.options = NULL; 1823 parms.dp = dp; 1824 parms.port_no = OVSP_LOCAL; 1825 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1826 parms.desired_ifindex = a[OVS_DP_ATTR_IFINDEX] 1827 ? nla_get_u32(a[OVS_DP_ATTR_IFINDEX]) : 0; 1828 1829 /* So far only local changes have been made, now need the lock. */ 1830 ovs_lock(); 1831 1832 err = ovs_dp_change(dp, a); 1833 if (err) 1834 goto err_unlock_and_destroy_meters; 1835 1836 vport = new_vport(&parms); 1837 if (IS_ERR(vport)) { 1838 err = PTR_ERR(vport); 1839 if (err == -EBUSY) 1840 err = -EEXIST; 1841 1842 if (err == -EEXIST) { 1843 /* An outdated user space instance that does not understand 1844 * the concept of user_features has attempted to create a new 1845 * datapath and is likely to reuse it. Drop all user features. 1846 */ 1847 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1848 ovs_dp_reset_user_features(skb, info); 1849 } 1850 1851 goto err_destroy_portids; 1852 } 1853 1854 vport->upcall_stats = netdev_alloc_pcpu_stats(struct vport_upcall_stats_percpu); 1855 if (!vport->upcall_stats) { 1856 err = -ENOMEM; 1857 goto err_destroy_portids; 1858 } 1859 1860 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1861 info->snd_seq, 0, OVS_DP_CMD_NEW); 1862 BUG_ON(err < 0); 1863 1864 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1865 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1866 1867 ovs_unlock(); 1868 1869 ovs_notify(&dp_datapath_genl_family, reply, info); 1870 return 0; 1871 1872 err_destroy_portids: 1873 kfree(rcu_dereference_raw(dp->upcall_portids)); 1874 err_unlock_and_destroy_meters: 1875 ovs_unlock(); 1876 ovs_meters_exit(dp); 1877 err_destroy_ports: 1878 kfree(dp->ports); 1879 err_destroy_stats: 1880 free_percpu(dp->stats_percpu); 1881 err_destroy_table: 1882 ovs_flow_tbl_destroy(&dp->table); 1883 err_destroy_dp: 1884 kfree(dp); 1885 err_destroy_reply: 1886 kfree_skb(reply); 1887 err: 1888 return err; 1889 } 1890 1891 /* Called with ovs_mutex. */ 1892 static void __dp_destroy(struct datapath *dp) 1893 { 1894 struct flow_table *table = &dp->table; 1895 int i; 1896 1897 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) 1898 tc_skb_ext_tc_disable(); 1899 1900 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1901 struct vport *vport; 1902 struct hlist_node *n; 1903 1904 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1905 if (vport->port_no != OVSP_LOCAL) 1906 ovs_dp_detach_port(vport); 1907 } 1908 1909 list_del_rcu(&dp->list_node); 1910 1911 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1912 * all ports in datapath are destroyed first before freeing datapath. 1913 */ 1914 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1915 1916 /* Flush sw_flow in the tables. RCU cb only releases resource 1917 * such as dp, ports and tables. That may avoid some issues 1918 * such as RCU usage warning. 1919 */ 1920 table_instance_flow_flush(table, ovsl_dereference(table->ti), 1921 ovsl_dereference(table->ufid_ti)); 1922 1923 /* RCU destroy the ports, meters and flow tables. */ 1924 call_rcu(&dp->rcu, destroy_dp_rcu); 1925 } 1926 1927 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1928 { 1929 struct sk_buff *reply; 1930 struct datapath *dp; 1931 int err; 1932 1933 reply = ovs_dp_cmd_alloc_info(); 1934 if (!reply) 1935 return -ENOMEM; 1936 1937 ovs_lock(); 1938 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, 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), info->userhdr, info->attrs); 1972 err = PTR_ERR(dp); 1973 if (IS_ERR(dp)) 1974 goto err_unlock_free; 1975 1976 err = ovs_dp_change(dp, info->attrs); 1977 if (err) 1978 goto err_unlock_free; 1979 1980 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1981 info->snd_seq, 0, OVS_DP_CMD_SET); 1982 BUG_ON(err < 0); 1983 1984 ovs_unlock(); 1985 ovs_notify(&dp_datapath_genl_family, reply, info); 1986 1987 return 0; 1988 1989 err_unlock_free: 1990 ovs_unlock(); 1991 kfree_skb(reply); 1992 return err; 1993 } 1994 1995 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1996 { 1997 struct sk_buff *reply; 1998 struct datapath *dp; 1999 int err; 2000 2001 reply = ovs_dp_cmd_alloc_info(); 2002 if (!reply) 2003 return -ENOMEM; 2004 2005 ovs_lock(); 2006 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 2007 if (IS_ERR(dp)) { 2008 err = PTR_ERR(dp); 2009 goto err_unlock_free; 2010 } 2011 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 2012 info->snd_seq, 0, OVS_DP_CMD_GET); 2013 BUG_ON(err < 0); 2014 ovs_unlock(); 2015 2016 return genlmsg_reply(reply, info); 2017 2018 err_unlock_free: 2019 ovs_unlock(); 2020 kfree_skb(reply); 2021 return err; 2022 } 2023 2024 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2025 { 2026 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 2027 struct datapath *dp; 2028 int skip = cb->args[0]; 2029 int i = 0; 2030 2031 ovs_lock(); 2032 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2033 if (i >= skip && 2034 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 2035 cb->nlh->nlmsg_seq, NLM_F_MULTI, 2036 OVS_DP_CMD_GET) < 0) 2037 break; 2038 i++; 2039 } 2040 ovs_unlock(); 2041 2042 cb->args[0] = i; 2043 2044 return skb->len; 2045 } 2046 2047 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 2048 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2049 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 2050 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 2051 [OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0, 2052 PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)), 2053 [OVS_DP_ATTR_IFINDEX] = {.type = NLA_U32 }, 2054 }; 2055 2056 static const struct genl_small_ops dp_datapath_genl_ops[] = { 2057 { .cmd = OVS_DP_CMD_NEW, 2058 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2059 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2060 .doit = ovs_dp_cmd_new 2061 }, 2062 { .cmd = OVS_DP_CMD_DEL, 2063 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2064 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2065 .doit = ovs_dp_cmd_del 2066 }, 2067 { .cmd = OVS_DP_CMD_GET, 2068 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2069 .flags = 0, /* OK for unprivileged users. */ 2070 .doit = ovs_dp_cmd_get, 2071 .dumpit = ovs_dp_cmd_dump 2072 }, 2073 { .cmd = OVS_DP_CMD_SET, 2074 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2075 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2076 .doit = ovs_dp_cmd_set, 2077 }, 2078 }; 2079 2080 static struct genl_family dp_datapath_genl_family __ro_after_init = { 2081 .hdrsize = sizeof(struct ovs_header), 2082 .name = OVS_DATAPATH_FAMILY, 2083 .version = OVS_DATAPATH_VERSION, 2084 .maxattr = OVS_DP_ATTR_MAX, 2085 .policy = datapath_policy, 2086 .netnsok = true, 2087 .parallel_ops = true, 2088 .small_ops = dp_datapath_genl_ops, 2089 .n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops), 2090 .resv_start_op = OVS_DP_CMD_SET + 1, 2091 .mcgrps = &ovs_dp_datapath_multicast_group, 2092 .n_mcgrps = 1, 2093 .module = THIS_MODULE, 2094 }; 2095 2096 /* Called with ovs_mutex or RCU read lock. */ 2097 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 2098 struct net *net, u32 portid, u32 seq, 2099 u32 flags, u8 cmd, gfp_t gfp) 2100 { 2101 struct ovs_header *ovs_header; 2102 struct ovs_vport_stats vport_stats; 2103 int err; 2104 2105 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 2106 flags, cmd); 2107 if (!ovs_header) 2108 return -EMSGSIZE; 2109 2110 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 2111 2112 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 2113 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 2114 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 2115 ovs_vport_name(vport)) || 2116 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex)) 2117 goto nla_put_failure; 2118 2119 if (!net_eq(net, dev_net(vport->dev))) { 2120 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp); 2121 2122 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id)) 2123 goto nla_put_failure; 2124 } 2125 2126 ovs_vport_get_stats(vport, &vport_stats); 2127 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS, 2128 sizeof(struct ovs_vport_stats), &vport_stats, 2129 OVS_VPORT_ATTR_PAD)) 2130 goto nla_put_failure; 2131 2132 if (ovs_vport_get_upcall_stats(vport, skb)) 2133 goto nla_put_failure; 2134 2135 if (ovs_vport_get_upcall_portids(vport, skb)) 2136 goto nla_put_failure; 2137 2138 err = ovs_vport_get_options(vport, skb); 2139 if (err == -EMSGSIZE) 2140 goto error; 2141 2142 genlmsg_end(skb, ovs_header); 2143 return 0; 2144 2145 nla_put_failure: 2146 err = -EMSGSIZE; 2147 error: 2148 genlmsg_cancel(skb, ovs_header); 2149 return err; 2150 } 2151 2152 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 2153 { 2154 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2155 } 2156 2157 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 2158 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net, 2159 u32 portid, u32 seq, u8 cmd) 2160 { 2161 struct sk_buff *skb; 2162 int retval; 2163 2164 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2165 if (!skb) 2166 return ERR_PTR(-ENOMEM); 2167 2168 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd, 2169 GFP_KERNEL); 2170 BUG_ON(retval < 0); 2171 2172 return skb; 2173 } 2174 2175 /* Called with ovs_mutex or RCU read lock. */ 2176 static struct vport *lookup_vport(struct net *net, 2177 const struct ovs_header *ovs_header, 2178 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 2179 { 2180 struct datapath *dp; 2181 struct vport *vport; 2182 2183 if (a[OVS_VPORT_ATTR_IFINDEX]) 2184 return ERR_PTR(-EOPNOTSUPP); 2185 if (a[OVS_VPORT_ATTR_NAME]) { 2186 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 2187 if (!vport) 2188 return ERR_PTR(-ENODEV); 2189 if (ovs_header->dp_ifindex && 2190 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 2191 return ERR_PTR(-ENODEV); 2192 return vport; 2193 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 2194 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 2195 2196 if (port_no >= DP_MAX_PORTS) 2197 return ERR_PTR(-EFBIG); 2198 2199 dp = get_dp(net, ovs_header->dp_ifindex); 2200 if (!dp) 2201 return ERR_PTR(-ENODEV); 2202 2203 vport = ovs_vport_ovsl_rcu(dp, port_no); 2204 if (!vport) 2205 return ERR_PTR(-ENODEV); 2206 return vport; 2207 } else 2208 return ERR_PTR(-EINVAL); 2209 2210 } 2211 2212 static unsigned int ovs_get_max_headroom(struct datapath *dp) 2213 { 2214 unsigned int dev_headroom, max_headroom = 0; 2215 struct net_device *dev; 2216 struct vport *vport; 2217 int i; 2218 2219 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2220 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, 2221 lockdep_ovsl_is_held()) { 2222 dev = vport->dev; 2223 dev_headroom = netdev_get_fwd_headroom(dev); 2224 if (dev_headroom > max_headroom) 2225 max_headroom = dev_headroom; 2226 } 2227 } 2228 2229 return max_headroom; 2230 } 2231 2232 /* Called with ovs_mutex */ 2233 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom) 2234 { 2235 struct vport *vport; 2236 int i; 2237 2238 dp->max_headroom = new_headroom; 2239 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2240 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, 2241 lockdep_ovsl_is_held()) 2242 netdev_set_rx_headroom(vport->dev, new_headroom); 2243 } 2244 } 2245 2246 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 2247 { 2248 struct nlattr **a = info->attrs; 2249 struct ovs_header *ovs_header = info->userhdr; 2250 struct vport_parms parms; 2251 struct sk_buff *reply; 2252 struct vport *vport; 2253 struct datapath *dp; 2254 unsigned int new_headroom; 2255 u32 port_no; 2256 int err; 2257 2258 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 2259 !a[OVS_VPORT_ATTR_UPCALL_PID]) 2260 return -EINVAL; 2261 2262 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 2263 2264 if (a[OVS_VPORT_ATTR_IFINDEX] && parms.type != OVS_VPORT_TYPE_INTERNAL) 2265 return -EOPNOTSUPP; 2266 2267 port_no = a[OVS_VPORT_ATTR_PORT_NO] 2268 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 2269 if (port_no >= DP_MAX_PORTS) 2270 return -EFBIG; 2271 2272 reply = ovs_vport_cmd_alloc_info(); 2273 if (!reply) 2274 return -ENOMEM; 2275 2276 ovs_lock(); 2277 restart: 2278 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 2279 err = -ENODEV; 2280 if (!dp) 2281 goto exit_unlock_free; 2282 2283 if (port_no) { 2284 vport = ovs_vport_ovsl(dp, port_no); 2285 err = -EBUSY; 2286 if (vport) 2287 goto exit_unlock_free; 2288 } else { 2289 for (port_no = 1; ; port_no++) { 2290 if (port_no >= DP_MAX_PORTS) { 2291 err = -EFBIG; 2292 goto exit_unlock_free; 2293 } 2294 vport = ovs_vport_ovsl(dp, port_no); 2295 if (!vport) 2296 break; 2297 } 2298 } 2299 2300 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 2301 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 2302 parms.dp = dp; 2303 parms.port_no = port_no; 2304 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2305 parms.desired_ifindex = a[OVS_VPORT_ATTR_IFINDEX] 2306 ? nla_get_u32(a[OVS_VPORT_ATTR_IFINDEX]) : 0; 2307 2308 vport = new_vport(&parms); 2309 err = PTR_ERR(vport); 2310 if (IS_ERR(vport)) { 2311 if (err == -EAGAIN) 2312 goto restart; 2313 goto exit_unlock_free; 2314 } 2315 2316 vport->upcall_stats = netdev_alloc_pcpu_stats(struct vport_upcall_stats_percpu); 2317 if (!vport->upcall_stats) { 2318 err = -ENOMEM; 2319 goto exit_unlock_free; 2320 } 2321 2322 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2323 info->snd_portid, info->snd_seq, 0, 2324 OVS_VPORT_CMD_NEW, GFP_KERNEL); 2325 2326 new_headroom = netdev_get_fwd_headroom(vport->dev); 2327 2328 if (new_headroom > dp->max_headroom) 2329 ovs_update_headroom(dp, new_headroom); 2330 else 2331 netdev_set_rx_headroom(vport->dev, dp->max_headroom); 2332 2333 BUG_ON(err < 0); 2334 ovs_unlock(); 2335 2336 ovs_notify(&dp_vport_genl_family, reply, info); 2337 return 0; 2338 2339 exit_unlock_free: 2340 ovs_unlock(); 2341 kfree_skb(reply); 2342 return err; 2343 } 2344 2345 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 2346 { 2347 struct nlattr **a = info->attrs; 2348 struct sk_buff *reply; 2349 struct vport *vport; 2350 int err; 2351 2352 reply = ovs_vport_cmd_alloc_info(); 2353 if (!reply) 2354 return -ENOMEM; 2355 2356 ovs_lock(); 2357 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2358 err = PTR_ERR(vport); 2359 if (IS_ERR(vport)) 2360 goto exit_unlock_free; 2361 2362 if (a[OVS_VPORT_ATTR_TYPE] && 2363 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 2364 err = -EINVAL; 2365 goto exit_unlock_free; 2366 } 2367 2368 if (a[OVS_VPORT_ATTR_OPTIONS]) { 2369 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 2370 if (err) 2371 goto exit_unlock_free; 2372 } 2373 2374 2375 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 2376 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2377 2378 err = ovs_vport_set_upcall_portids(vport, ids); 2379 if (err) 2380 goto exit_unlock_free; 2381 } 2382 2383 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2384 info->snd_portid, info->snd_seq, 0, 2385 OVS_VPORT_CMD_SET, GFP_KERNEL); 2386 BUG_ON(err < 0); 2387 2388 ovs_unlock(); 2389 ovs_notify(&dp_vport_genl_family, reply, info); 2390 return 0; 2391 2392 exit_unlock_free: 2393 ovs_unlock(); 2394 kfree_skb(reply); 2395 return err; 2396 } 2397 2398 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2399 { 2400 bool update_headroom = false; 2401 struct nlattr **a = info->attrs; 2402 struct sk_buff *reply; 2403 struct datapath *dp; 2404 struct vport *vport; 2405 unsigned int new_headroom; 2406 int err; 2407 2408 reply = ovs_vport_cmd_alloc_info(); 2409 if (!reply) 2410 return -ENOMEM; 2411 2412 ovs_lock(); 2413 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2414 err = PTR_ERR(vport); 2415 if (IS_ERR(vport)) 2416 goto exit_unlock_free; 2417 2418 if (vport->port_no == OVSP_LOCAL) { 2419 err = -EINVAL; 2420 goto exit_unlock_free; 2421 } 2422 2423 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2424 info->snd_portid, info->snd_seq, 0, 2425 OVS_VPORT_CMD_DEL, GFP_KERNEL); 2426 BUG_ON(err < 0); 2427 2428 /* the vport deletion may trigger dp headroom update */ 2429 dp = vport->dp; 2430 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom) 2431 update_headroom = true; 2432 2433 netdev_reset_rx_headroom(vport->dev); 2434 ovs_dp_detach_port(vport); 2435 2436 if (update_headroom) { 2437 new_headroom = ovs_get_max_headroom(dp); 2438 2439 if (new_headroom < dp->max_headroom) 2440 ovs_update_headroom(dp, new_headroom); 2441 } 2442 ovs_unlock(); 2443 2444 ovs_notify(&dp_vport_genl_family, reply, info); 2445 return 0; 2446 2447 exit_unlock_free: 2448 ovs_unlock(); 2449 kfree_skb(reply); 2450 return err; 2451 } 2452 2453 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2454 { 2455 struct nlattr **a = info->attrs; 2456 struct ovs_header *ovs_header = info->userhdr; 2457 struct sk_buff *reply; 2458 struct vport *vport; 2459 int err; 2460 2461 reply = ovs_vport_cmd_alloc_info(); 2462 if (!reply) 2463 return -ENOMEM; 2464 2465 rcu_read_lock(); 2466 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2467 err = PTR_ERR(vport); 2468 if (IS_ERR(vport)) 2469 goto exit_unlock_free; 2470 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2471 info->snd_portid, info->snd_seq, 0, 2472 OVS_VPORT_CMD_GET, GFP_ATOMIC); 2473 BUG_ON(err < 0); 2474 rcu_read_unlock(); 2475 2476 return genlmsg_reply(reply, info); 2477 2478 exit_unlock_free: 2479 rcu_read_unlock(); 2480 kfree_skb(reply); 2481 return err; 2482 } 2483 2484 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2485 { 2486 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2487 struct datapath *dp; 2488 int bucket = cb->args[0], skip = cb->args[1]; 2489 int i, j = 0; 2490 2491 rcu_read_lock(); 2492 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2493 if (!dp) { 2494 rcu_read_unlock(); 2495 return -ENODEV; 2496 } 2497 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2498 struct vport *vport; 2499 2500 j = 0; 2501 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2502 if (j >= skip && 2503 ovs_vport_cmd_fill_info(vport, skb, 2504 sock_net(skb->sk), 2505 NETLINK_CB(cb->skb).portid, 2506 cb->nlh->nlmsg_seq, 2507 NLM_F_MULTI, 2508 OVS_VPORT_CMD_GET, 2509 GFP_ATOMIC) < 0) 2510 goto out; 2511 2512 j++; 2513 } 2514 skip = 0; 2515 } 2516 out: 2517 rcu_read_unlock(); 2518 2519 cb->args[0] = i; 2520 cb->args[1] = j; 2521 2522 return skb->len; 2523 } 2524 2525 static void ovs_dp_masks_rebalance(struct work_struct *work) 2526 { 2527 struct ovs_net *ovs_net = container_of(work, struct ovs_net, 2528 masks_rebalance.work); 2529 struct datapath *dp; 2530 2531 ovs_lock(); 2532 2533 list_for_each_entry(dp, &ovs_net->dps, list_node) 2534 ovs_flow_masks_rebalance(&dp->table); 2535 2536 ovs_unlock(); 2537 2538 schedule_delayed_work(&ovs_net->masks_rebalance, 2539 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL)); 2540 } 2541 2542 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2543 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2544 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2545 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2546 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2547 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC }, 2548 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2549 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 }, 2550 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 }, 2551 [OVS_VPORT_ATTR_UPCALL_STATS] = { .type = NLA_NESTED }, 2552 }; 2553 2554 static const struct genl_small_ops dp_vport_genl_ops[] = { 2555 { .cmd = OVS_VPORT_CMD_NEW, 2556 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2557 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2558 .doit = ovs_vport_cmd_new 2559 }, 2560 { .cmd = OVS_VPORT_CMD_DEL, 2561 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2562 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2563 .doit = ovs_vport_cmd_del 2564 }, 2565 { .cmd = OVS_VPORT_CMD_GET, 2566 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2567 .flags = 0, /* OK for unprivileged users. */ 2568 .doit = ovs_vport_cmd_get, 2569 .dumpit = ovs_vport_cmd_dump 2570 }, 2571 { .cmd = OVS_VPORT_CMD_SET, 2572 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2573 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2574 .doit = ovs_vport_cmd_set, 2575 }, 2576 }; 2577 2578 struct genl_family dp_vport_genl_family __ro_after_init = { 2579 .hdrsize = sizeof(struct ovs_header), 2580 .name = OVS_VPORT_FAMILY, 2581 .version = OVS_VPORT_VERSION, 2582 .maxattr = OVS_VPORT_ATTR_MAX, 2583 .policy = vport_policy, 2584 .netnsok = true, 2585 .parallel_ops = true, 2586 .small_ops = dp_vport_genl_ops, 2587 .n_small_ops = ARRAY_SIZE(dp_vport_genl_ops), 2588 .resv_start_op = OVS_VPORT_CMD_SET + 1, 2589 .mcgrps = &ovs_dp_vport_multicast_group, 2590 .n_mcgrps = 1, 2591 .module = THIS_MODULE, 2592 }; 2593 2594 static struct genl_family * const dp_genl_families[] = { 2595 &dp_datapath_genl_family, 2596 &dp_vport_genl_family, 2597 &dp_flow_genl_family, 2598 &dp_packet_genl_family, 2599 &dp_meter_genl_family, 2600 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 2601 &dp_ct_limit_genl_family, 2602 #endif 2603 }; 2604 2605 static void dp_unregister_genl(int n_families) 2606 { 2607 int i; 2608 2609 for (i = 0; i < n_families; i++) 2610 genl_unregister_family(dp_genl_families[i]); 2611 } 2612 2613 static int __init dp_register_genl(void) 2614 { 2615 int err; 2616 int i; 2617 2618 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2619 2620 err = genl_register_family(dp_genl_families[i]); 2621 if (err) 2622 goto error; 2623 } 2624 2625 return 0; 2626 2627 error: 2628 dp_unregister_genl(i); 2629 return err; 2630 } 2631 2632 static int __net_init ovs_init_net(struct net *net) 2633 { 2634 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2635 int err; 2636 2637 INIT_LIST_HEAD(&ovs_net->dps); 2638 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2639 INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance); 2640 2641 err = ovs_ct_init(net); 2642 if (err) 2643 return err; 2644 2645 schedule_delayed_work(&ovs_net->masks_rebalance, 2646 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL)); 2647 return 0; 2648 } 2649 2650 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2651 struct list_head *head) 2652 { 2653 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2654 struct datapath *dp; 2655 2656 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2657 int i; 2658 2659 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2660 struct vport *vport; 2661 2662 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2663 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2664 continue; 2665 2666 if (dev_net(vport->dev) == dnet) 2667 list_add(&vport->detach_list, head); 2668 } 2669 } 2670 } 2671 } 2672 2673 static void __net_exit ovs_exit_net(struct net *dnet) 2674 { 2675 struct datapath *dp, *dp_next; 2676 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2677 struct vport *vport, *vport_next; 2678 struct net *net; 2679 LIST_HEAD(head); 2680 2681 ovs_lock(); 2682 2683 ovs_ct_exit(dnet); 2684 2685 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2686 __dp_destroy(dp); 2687 2688 down_read(&net_rwsem); 2689 for_each_net(net) 2690 list_vports_from_net(net, dnet, &head); 2691 up_read(&net_rwsem); 2692 2693 /* Detach all vports from given namespace. */ 2694 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2695 list_del(&vport->detach_list); 2696 ovs_dp_detach_port(vport); 2697 } 2698 2699 ovs_unlock(); 2700 2701 cancel_delayed_work_sync(&ovs_net->masks_rebalance); 2702 cancel_work_sync(&ovs_net->dp_notify_work); 2703 } 2704 2705 static struct pernet_operations ovs_net_ops = { 2706 .init = ovs_init_net, 2707 .exit = ovs_exit_net, 2708 .id = &ovs_net_id, 2709 .size = sizeof(struct ovs_net), 2710 }; 2711 2712 static int __init dp_init(void) 2713 { 2714 int err; 2715 2716 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > 2717 sizeof_field(struct sk_buff, cb)); 2718 2719 pr_info("Open vSwitch switching datapath\n"); 2720 2721 err = action_fifos_init(); 2722 if (err) 2723 goto error; 2724 2725 err = ovs_internal_dev_rtnl_link_register(); 2726 if (err) 2727 goto error_action_fifos_exit; 2728 2729 err = ovs_flow_init(); 2730 if (err) 2731 goto error_unreg_rtnl_link; 2732 2733 err = ovs_vport_init(); 2734 if (err) 2735 goto error_flow_exit; 2736 2737 err = register_pernet_device(&ovs_net_ops); 2738 if (err) 2739 goto error_vport_exit; 2740 2741 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2742 if (err) 2743 goto error_netns_exit; 2744 2745 err = ovs_netdev_init(); 2746 if (err) 2747 goto error_unreg_notifier; 2748 2749 err = dp_register_genl(); 2750 if (err < 0) 2751 goto error_unreg_netdev; 2752 2753 return 0; 2754 2755 error_unreg_netdev: 2756 ovs_netdev_exit(); 2757 error_unreg_notifier: 2758 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2759 error_netns_exit: 2760 unregister_pernet_device(&ovs_net_ops); 2761 error_vport_exit: 2762 ovs_vport_exit(); 2763 error_flow_exit: 2764 ovs_flow_exit(); 2765 error_unreg_rtnl_link: 2766 ovs_internal_dev_rtnl_link_unregister(); 2767 error_action_fifos_exit: 2768 action_fifos_exit(); 2769 error: 2770 return err; 2771 } 2772 2773 static void dp_cleanup(void) 2774 { 2775 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2776 ovs_netdev_exit(); 2777 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2778 unregister_pernet_device(&ovs_net_ops); 2779 rcu_barrier(); 2780 ovs_vport_exit(); 2781 ovs_flow_exit(); 2782 ovs_internal_dev_rtnl_link_unregister(); 2783 action_fifos_exit(); 2784 } 2785 2786 module_init(dp_init); 2787 module_exit(dp_cleanup); 2788 2789 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2790 MODULE_LICENSE("GPL"); 2791 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY); 2792 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY); 2793 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY); 2794 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY); 2795 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY); 2796 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY); 2797