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 void ovs_dp_detach_port(struct vport *p) 213 { 214 ASSERT_OVSL(); 215 216 /* First drop references to device. */ 217 hlist_del_rcu(&p->dp_hash_node); 218 219 /* Then destroy it. */ 220 ovs_vport_del(p); 221 } 222 223 /* Must be called with rcu_read_lock. */ 224 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key) 225 { 226 const struct vport *p = OVS_CB(skb)->input_vport; 227 struct datapath *dp = p->dp; 228 struct sw_flow *flow; 229 struct sw_flow_actions *sf_acts; 230 struct dp_stats_percpu *stats; 231 u64 *stats_counter; 232 u32 n_mask_hit; 233 u32 n_cache_hit; 234 int error; 235 236 stats = this_cpu_ptr(dp->stats_percpu); 237 238 /* Look up flow. */ 239 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb), 240 &n_mask_hit, &n_cache_hit); 241 if (unlikely(!flow)) { 242 struct dp_upcall_info upcall; 243 244 memset(&upcall, 0, sizeof(upcall)); 245 upcall.cmd = OVS_PACKET_CMD_MISS; 246 247 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU) 248 upcall.portid = 249 ovs_dp_get_upcall_portid(dp, smp_processor_id()); 250 else 251 upcall.portid = ovs_vport_find_upcall_portid(p, skb); 252 253 upcall.mru = OVS_CB(skb)->mru; 254 error = ovs_dp_upcall(dp, skb, key, &upcall, 0); 255 switch (error) { 256 case 0: 257 case -EAGAIN: 258 case -ERESTARTSYS: 259 case -EINTR: 260 consume_skb(skb); 261 break; 262 default: 263 kfree_skb(skb); 264 break; 265 } 266 stats_counter = &stats->n_missed; 267 goto out; 268 } 269 270 ovs_flow_stats_update(flow, key->tp.flags, skb); 271 sf_acts = rcu_dereference(flow->sf_acts); 272 error = ovs_execute_actions(dp, skb, sf_acts, key); 273 if (unlikely(error)) 274 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n", 275 ovs_dp_name(dp), error); 276 277 stats_counter = &stats->n_hit; 278 279 out: 280 /* Update datapath statistics. */ 281 u64_stats_update_begin(&stats->syncp); 282 (*stats_counter)++; 283 stats->n_mask_hit += n_mask_hit; 284 stats->n_cache_hit += n_cache_hit; 285 u64_stats_update_end(&stats->syncp); 286 } 287 288 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, 289 const struct sw_flow_key *key, 290 const struct dp_upcall_info *upcall_info, 291 uint32_t cutlen) 292 { 293 struct dp_stats_percpu *stats; 294 int err; 295 296 if (trace_ovs_dp_upcall_enabled()) 297 trace_ovs_dp_upcall(dp, skb, key, upcall_info); 298 299 if (upcall_info->portid == 0) { 300 err = -ENOTCONN; 301 goto err; 302 } 303 304 if (!skb_is_gso(skb)) 305 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 306 else 307 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen); 308 if (err) 309 goto err; 310 311 return 0; 312 313 err: 314 stats = this_cpu_ptr(dp->stats_percpu); 315 316 u64_stats_update_begin(&stats->syncp); 317 stats->n_lost++; 318 u64_stats_update_end(&stats->syncp); 319 320 return err; 321 } 322 323 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, 324 const struct sw_flow_key *key, 325 const struct dp_upcall_info *upcall_info, 326 uint32_t cutlen) 327 { 328 unsigned int gso_type = skb_shinfo(skb)->gso_type; 329 struct sw_flow_key later_key; 330 struct sk_buff *segs, *nskb; 331 int err; 332 333 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET); 334 segs = __skb_gso_segment(skb, NETIF_F_SG, false); 335 if (IS_ERR(segs)) 336 return PTR_ERR(segs); 337 if (segs == NULL) 338 return -EINVAL; 339 340 if (gso_type & SKB_GSO_UDP) { 341 /* The initial flow key extracted by ovs_flow_key_extract() 342 * in this case is for a first fragment, so we need to 343 * properly mark later fragments. 344 */ 345 later_key = *key; 346 later_key.ip.frag = OVS_FRAG_TYPE_LATER; 347 } 348 349 /* Queue all of the segments. */ 350 skb_list_walk_safe(segs, skb, nskb) { 351 if (gso_type & SKB_GSO_UDP && skb != segs) 352 key = &later_key; 353 354 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); 355 if (err) 356 break; 357 358 } 359 360 /* Free all of the segments. */ 361 skb_list_walk_safe(segs, skb, nskb) { 362 if (err) 363 kfree_skb(skb); 364 else 365 consume_skb(skb); 366 } 367 return err; 368 } 369 370 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, 371 unsigned int hdrlen, int actions_attrlen) 372 { 373 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) 374 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ 375 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */ 376 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */ 377 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */ 378 379 /* OVS_PACKET_ATTR_USERDATA */ 380 if (upcall_info->userdata) 381 size += NLA_ALIGN(upcall_info->userdata->nla_len); 382 383 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ 384 if (upcall_info->egress_tun_info) 385 size += nla_total_size(ovs_tun_key_attr_size()); 386 387 /* OVS_PACKET_ATTR_ACTIONS */ 388 if (upcall_info->actions_len) 389 size += nla_total_size(actions_attrlen); 390 391 /* OVS_PACKET_ATTR_MRU */ 392 if (upcall_info->mru) 393 size += nla_total_size(sizeof(upcall_info->mru)); 394 395 return size; 396 } 397 398 static void pad_packet(struct datapath *dp, struct sk_buff *skb) 399 { 400 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { 401 size_t plen = NLA_ALIGN(skb->len) - skb->len; 402 403 if (plen > 0) 404 skb_put_zero(skb, plen); 405 } 406 } 407 408 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, 409 const struct sw_flow_key *key, 410 const struct dp_upcall_info *upcall_info, 411 uint32_t cutlen) 412 { 413 struct ovs_header *upcall; 414 struct sk_buff *nskb = NULL; 415 struct sk_buff *user_skb = NULL; /* to be queued to userspace */ 416 struct nlattr *nla; 417 size_t len; 418 unsigned int hlen; 419 int err, dp_ifindex; 420 u64 hash; 421 422 dp_ifindex = get_dpifindex(dp); 423 if (!dp_ifindex) 424 return -ENODEV; 425 426 if (skb_vlan_tag_present(skb)) { 427 nskb = skb_clone(skb, GFP_ATOMIC); 428 if (!nskb) 429 return -ENOMEM; 430 431 nskb = __vlan_hwaccel_push_inside(nskb); 432 if (!nskb) 433 return -ENOMEM; 434 435 skb = nskb; 436 } 437 438 if (nla_attr_size(skb->len) > USHRT_MAX) { 439 err = -EFBIG; 440 goto out; 441 } 442 443 /* Complete checksum if needed */ 444 if (skb->ip_summed == CHECKSUM_PARTIAL && 445 (err = skb_csum_hwoffload_help(skb, 0))) 446 goto out; 447 448 /* Older versions of OVS user space enforce alignment of the last 449 * Netlink attribute to NLA_ALIGNTO which would require extensive 450 * padding logic. Only perform zerocopy if padding is not required. 451 */ 452 if (dp->user_features & OVS_DP_F_UNALIGNED) 453 hlen = skb_zerocopy_headlen(skb); 454 else 455 hlen = skb->len; 456 457 len = upcall_msg_size(upcall_info, hlen - cutlen, 458 OVS_CB(skb)->acts_origlen); 459 user_skb = genlmsg_new(len, GFP_ATOMIC); 460 if (!user_skb) { 461 err = -ENOMEM; 462 goto out; 463 } 464 465 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 466 0, upcall_info->cmd); 467 if (!upcall) { 468 err = -EINVAL; 469 goto out; 470 } 471 upcall->dp_ifindex = dp_ifindex; 472 473 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); 474 if (err) 475 goto out; 476 477 if (upcall_info->userdata) 478 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, 479 nla_len(upcall_info->userdata), 480 nla_data(upcall_info->userdata)); 481 482 if (upcall_info->egress_tun_info) { 483 nla = nla_nest_start_noflag(user_skb, 484 OVS_PACKET_ATTR_EGRESS_TUN_KEY); 485 if (!nla) { 486 err = -EMSGSIZE; 487 goto out; 488 } 489 err = ovs_nla_put_tunnel_info(user_skb, 490 upcall_info->egress_tun_info); 491 if (err) 492 goto out; 493 494 nla_nest_end(user_skb, nla); 495 } 496 497 if (upcall_info->actions_len) { 498 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS); 499 if (!nla) { 500 err = -EMSGSIZE; 501 goto out; 502 } 503 err = ovs_nla_put_actions(upcall_info->actions, 504 upcall_info->actions_len, 505 user_skb); 506 if (!err) 507 nla_nest_end(user_skb, nla); 508 else 509 nla_nest_cancel(user_skb, nla); 510 } 511 512 /* Add OVS_PACKET_ATTR_MRU */ 513 if (upcall_info->mru && 514 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) { 515 err = -ENOBUFS; 516 goto out; 517 } 518 519 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */ 520 if (cutlen > 0 && 521 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) { 522 err = -ENOBUFS; 523 goto out; 524 } 525 526 /* Add OVS_PACKET_ATTR_HASH */ 527 hash = skb_get_hash_raw(skb); 528 if (skb->sw_hash) 529 hash |= OVS_PACKET_HASH_SW_BIT; 530 531 if (skb->l4_hash) 532 hash |= OVS_PACKET_HASH_L4_BIT; 533 534 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) { 535 err = -ENOBUFS; 536 goto out; 537 } 538 539 /* Only reserve room for attribute header, packet data is added 540 * in skb_zerocopy() */ 541 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { 542 err = -ENOBUFS; 543 goto out; 544 } 545 nla->nla_len = nla_attr_size(skb->len - cutlen); 546 547 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen); 548 if (err) 549 goto out; 550 551 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ 552 pad_packet(dp, user_skb); 553 554 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; 555 556 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); 557 user_skb = NULL; 558 out: 559 if (err) 560 skb_tx_error(skb); 561 consume_skb(user_skb); 562 consume_skb(nskb); 563 564 return err; 565 } 566 567 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 568 { 569 struct ovs_header *ovs_header = info->userhdr; 570 struct net *net = sock_net(skb->sk); 571 struct nlattr **a = info->attrs; 572 struct sw_flow_actions *acts; 573 struct sk_buff *packet; 574 struct sw_flow *flow; 575 struct sw_flow_actions *sf_acts; 576 struct datapath *dp; 577 struct vport *input_vport; 578 u16 mru = 0; 579 u64 hash; 580 int len; 581 int err; 582 bool log = !a[OVS_PACKET_ATTR_PROBE]; 583 584 err = -EINVAL; 585 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || 586 !a[OVS_PACKET_ATTR_ACTIONS]) 587 goto err; 588 589 len = nla_len(a[OVS_PACKET_ATTR_PACKET]); 590 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); 591 err = -ENOMEM; 592 if (!packet) 593 goto err; 594 skb_reserve(packet, NET_IP_ALIGN); 595 596 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); 597 598 /* Set packet's mru */ 599 if (a[OVS_PACKET_ATTR_MRU]) { 600 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]); 601 packet->ignore_df = 1; 602 } 603 OVS_CB(packet)->mru = mru; 604 605 if (a[OVS_PACKET_ATTR_HASH]) { 606 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]); 607 608 __skb_set_hash(packet, hash & 0xFFFFFFFFULL, 609 !!(hash & OVS_PACKET_HASH_SW_BIT), 610 !!(hash & OVS_PACKET_HASH_L4_BIT)); 611 } 612 613 /* Build an sw_flow for sending this packet. */ 614 flow = ovs_flow_alloc(); 615 err = PTR_ERR(flow); 616 if (IS_ERR(flow)) 617 goto err_kfree_skb; 618 619 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY], 620 packet, &flow->key, log); 621 if (err) 622 goto err_flow_free; 623 624 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS], 625 &flow->key, &acts, log); 626 if (err) 627 goto err_flow_free; 628 629 rcu_assign_pointer(flow->sf_acts, acts); 630 packet->priority = flow->key.phy.priority; 631 packet->mark = flow->key.phy.skb_mark; 632 633 rcu_read_lock(); 634 dp = get_dp_rcu(net, ovs_header->dp_ifindex); 635 err = -ENODEV; 636 if (!dp) 637 goto err_unlock; 638 639 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); 640 if (!input_vport) 641 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); 642 643 if (!input_vport) 644 goto err_unlock; 645 646 packet->dev = input_vport->dev; 647 OVS_CB(packet)->input_vport = input_vport; 648 sf_acts = rcu_dereference(flow->sf_acts); 649 650 local_bh_disable(); 651 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); 652 local_bh_enable(); 653 rcu_read_unlock(); 654 655 ovs_flow_free(flow, false); 656 return err; 657 658 err_unlock: 659 rcu_read_unlock(); 660 err_flow_free: 661 ovs_flow_free(flow, false); 662 err_kfree_skb: 663 kfree_skb(packet); 664 err: 665 return err; 666 } 667 668 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { 669 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, 670 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, 671 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, 672 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, 673 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, 674 [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 }, 675 }; 676 677 static const struct genl_small_ops dp_packet_genl_ops[] = { 678 { .cmd = OVS_PACKET_CMD_EXECUTE, 679 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 680 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 681 .doit = ovs_packet_cmd_execute 682 } 683 }; 684 685 static struct genl_family dp_packet_genl_family __ro_after_init = { 686 .hdrsize = sizeof(struct ovs_header), 687 .name = OVS_PACKET_FAMILY, 688 .version = OVS_PACKET_VERSION, 689 .maxattr = OVS_PACKET_ATTR_MAX, 690 .policy = packet_policy, 691 .netnsok = true, 692 .parallel_ops = true, 693 .small_ops = dp_packet_genl_ops, 694 .n_small_ops = ARRAY_SIZE(dp_packet_genl_ops), 695 .resv_start_op = OVS_PACKET_CMD_EXECUTE + 1, 696 .module = THIS_MODULE, 697 }; 698 699 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, 700 struct ovs_dp_megaflow_stats *mega_stats) 701 { 702 int i; 703 704 memset(mega_stats, 0, sizeof(*mega_stats)); 705 706 stats->n_flows = ovs_flow_tbl_count(&dp->table); 707 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); 708 709 stats->n_hit = stats->n_missed = stats->n_lost = 0; 710 711 for_each_possible_cpu(i) { 712 const struct dp_stats_percpu *percpu_stats; 713 struct dp_stats_percpu local_stats; 714 unsigned int start; 715 716 percpu_stats = per_cpu_ptr(dp->stats_percpu, i); 717 718 do { 719 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 720 local_stats = *percpu_stats; 721 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 722 723 stats->n_hit += local_stats.n_hit; 724 stats->n_missed += local_stats.n_missed; 725 stats->n_lost += local_stats.n_lost; 726 mega_stats->n_mask_hit += local_stats.n_mask_hit; 727 mega_stats->n_cache_hit += local_stats.n_cache_hit; 728 } 729 } 730 731 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) 732 { 733 return ovs_identifier_is_ufid(sfid) && 734 !(ufid_flags & OVS_UFID_F_OMIT_KEY); 735 } 736 737 static bool should_fill_mask(uint32_t ufid_flags) 738 { 739 return !(ufid_flags & OVS_UFID_F_OMIT_MASK); 740 } 741 742 static bool should_fill_actions(uint32_t ufid_flags) 743 { 744 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); 745 } 746 747 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, 748 const struct sw_flow_id *sfid, 749 uint32_t ufid_flags) 750 { 751 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); 752 753 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback 754 * see ovs_nla_put_identifier() 755 */ 756 if (sfid && ovs_identifier_is_ufid(sfid)) 757 len += nla_total_size(sfid->ufid_len); 758 else 759 len += nla_total_size(ovs_key_attr_size()); 760 761 /* OVS_FLOW_ATTR_KEY */ 762 if (!sfid || should_fill_key(sfid, ufid_flags)) 763 len += nla_total_size(ovs_key_attr_size()); 764 765 /* OVS_FLOW_ATTR_MASK */ 766 if (should_fill_mask(ufid_flags)) 767 len += nla_total_size(ovs_key_attr_size()); 768 769 /* OVS_FLOW_ATTR_ACTIONS */ 770 if (should_fill_actions(ufid_flags)) 771 len += nla_total_size(acts->orig_len); 772 773 return len 774 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ 775 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ 776 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */ 777 } 778 779 /* Called with ovs_mutex or RCU read lock. */ 780 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, 781 struct sk_buff *skb) 782 { 783 struct ovs_flow_stats stats; 784 __be16 tcp_flags; 785 unsigned long used; 786 787 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); 788 789 if (used && 790 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used), 791 OVS_FLOW_ATTR_PAD)) 792 return -EMSGSIZE; 793 794 if (stats.n_packets && 795 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS, 796 sizeof(struct ovs_flow_stats), &stats, 797 OVS_FLOW_ATTR_PAD)) 798 return -EMSGSIZE; 799 800 if ((u8)ntohs(tcp_flags) && 801 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) 802 return -EMSGSIZE; 803 804 return 0; 805 } 806 807 /* Called with ovs_mutex or RCU read lock. */ 808 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, 809 struct sk_buff *skb, int skb_orig_len) 810 { 811 struct nlattr *start; 812 int err; 813 814 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if 815 * this is the first flow to be dumped into 'skb'. This is unusual for 816 * Netlink but individual action lists can be longer than 817 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. 818 * The userspace caller can always fetch the actions separately if it 819 * really wants them. (Most userspace callers in fact don't care.) 820 * 821 * This can only fail for dump operations because the skb is always 822 * properly sized for single flows. 823 */ 824 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS); 825 if (start) { 826 const struct sw_flow_actions *sf_acts; 827 828 sf_acts = rcu_dereference_ovsl(flow->sf_acts); 829 err = ovs_nla_put_actions(sf_acts->actions, 830 sf_acts->actions_len, skb); 831 832 if (!err) 833 nla_nest_end(skb, start); 834 else { 835 if (skb_orig_len) 836 return err; 837 838 nla_nest_cancel(skb, start); 839 } 840 } else if (skb_orig_len) { 841 return -EMSGSIZE; 842 } 843 844 return 0; 845 } 846 847 /* Called with ovs_mutex or RCU read lock. */ 848 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, 849 struct sk_buff *skb, u32 portid, 850 u32 seq, u32 flags, u8 cmd, u32 ufid_flags) 851 { 852 const int skb_orig_len = skb->len; 853 struct ovs_header *ovs_header; 854 int err; 855 856 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, 857 flags, cmd); 858 if (!ovs_header) 859 return -EMSGSIZE; 860 861 ovs_header->dp_ifindex = dp_ifindex; 862 863 err = ovs_nla_put_identifier(flow, skb); 864 if (err) 865 goto error; 866 867 if (should_fill_key(&flow->id, ufid_flags)) { 868 err = ovs_nla_put_masked_key(flow, skb); 869 if (err) 870 goto error; 871 } 872 873 if (should_fill_mask(ufid_flags)) { 874 err = ovs_nla_put_mask(flow, skb); 875 if (err) 876 goto error; 877 } 878 879 err = ovs_flow_cmd_fill_stats(flow, skb); 880 if (err) 881 goto error; 882 883 if (should_fill_actions(ufid_flags)) { 884 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); 885 if (err) 886 goto error; 887 } 888 889 genlmsg_end(skb, ovs_header); 890 return 0; 891 892 error: 893 genlmsg_cancel(skb, ovs_header); 894 return err; 895 } 896 897 /* May not be called with RCU read lock. */ 898 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, 899 const struct sw_flow_id *sfid, 900 struct genl_info *info, 901 bool always, 902 uint32_t ufid_flags) 903 { 904 struct sk_buff *skb; 905 size_t len; 906 907 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) 908 return NULL; 909 910 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); 911 skb = genlmsg_new(len, GFP_KERNEL); 912 if (!skb) 913 return ERR_PTR(-ENOMEM); 914 915 return skb; 916 } 917 918 /* Called with ovs_mutex. */ 919 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, 920 int dp_ifindex, 921 struct genl_info *info, u8 cmd, 922 bool always, u32 ufid_flags) 923 { 924 struct sk_buff *skb; 925 int retval; 926 927 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), 928 &flow->id, info, always, ufid_flags); 929 if (IS_ERR_OR_NULL(skb)) 930 return skb; 931 932 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, 933 info->snd_portid, info->snd_seq, 0, 934 cmd, ufid_flags); 935 if (WARN_ON_ONCE(retval < 0)) { 936 kfree_skb(skb); 937 skb = ERR_PTR(retval); 938 } 939 return skb; 940 } 941 942 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) 943 { 944 struct net *net = sock_net(skb->sk); 945 struct nlattr **a = info->attrs; 946 struct ovs_header *ovs_header = info->userhdr; 947 struct sw_flow *flow = NULL, *new_flow; 948 struct sw_flow_mask mask; 949 struct sk_buff *reply; 950 struct datapath *dp; 951 struct sw_flow_actions *acts; 952 struct sw_flow_match match; 953 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 954 int error; 955 bool log = !a[OVS_FLOW_ATTR_PROBE]; 956 957 /* Must have key and actions. */ 958 error = -EINVAL; 959 if (!a[OVS_FLOW_ATTR_KEY]) { 960 OVS_NLERR(log, "Flow key attr not present in new flow."); 961 goto error; 962 } 963 if (!a[OVS_FLOW_ATTR_ACTIONS]) { 964 OVS_NLERR(log, "Flow actions attr not present in new flow."); 965 goto error; 966 } 967 968 /* Most of the time we need to allocate a new flow, do it before 969 * locking. 970 */ 971 new_flow = ovs_flow_alloc(); 972 if (IS_ERR(new_flow)) { 973 error = PTR_ERR(new_flow); 974 goto error; 975 } 976 977 /* Extract key. */ 978 ovs_match_init(&match, &new_flow->key, false, &mask); 979 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 980 a[OVS_FLOW_ATTR_MASK], log); 981 if (error) 982 goto err_kfree_flow; 983 984 /* Extract flow identifier. */ 985 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID], 986 &new_flow->key, log); 987 if (error) 988 goto err_kfree_flow; 989 990 /* unmasked key is needed to match when ufid is not used. */ 991 if (ovs_identifier_is_key(&new_flow->id)) 992 match.key = new_flow->id.unmasked_key; 993 994 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask); 995 996 /* Validate actions. */ 997 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS], 998 &new_flow->key, &acts, log); 999 if (error) { 1000 OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); 1001 goto err_kfree_flow; 1002 } 1003 1004 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false, 1005 ufid_flags); 1006 if (IS_ERR(reply)) { 1007 error = PTR_ERR(reply); 1008 goto err_kfree_acts; 1009 } 1010 1011 ovs_lock(); 1012 dp = get_dp(net, ovs_header->dp_ifindex); 1013 if (unlikely(!dp)) { 1014 error = -ENODEV; 1015 goto err_unlock_ovs; 1016 } 1017 1018 /* Check if this is a duplicate flow */ 1019 if (ovs_identifier_is_ufid(&new_flow->id)) 1020 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id); 1021 if (!flow) 1022 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key); 1023 if (likely(!flow)) { 1024 rcu_assign_pointer(new_flow->sf_acts, acts); 1025 1026 /* Put flow in bucket. */ 1027 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); 1028 if (unlikely(error)) { 1029 acts = NULL; 1030 goto err_unlock_ovs; 1031 } 1032 1033 if (unlikely(reply)) { 1034 error = ovs_flow_cmd_fill_info(new_flow, 1035 ovs_header->dp_ifindex, 1036 reply, info->snd_portid, 1037 info->snd_seq, 0, 1038 OVS_FLOW_CMD_NEW, 1039 ufid_flags); 1040 BUG_ON(error < 0); 1041 } 1042 ovs_unlock(); 1043 } else { 1044 struct sw_flow_actions *old_acts; 1045 1046 /* Bail out if we're not allowed to modify an existing flow. 1047 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL 1048 * because Generic Netlink treats the latter as a dump 1049 * request. We also accept NLM_F_EXCL in case that bug ever 1050 * gets fixed. 1051 */ 1052 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE 1053 | NLM_F_EXCL))) { 1054 error = -EEXIST; 1055 goto err_unlock_ovs; 1056 } 1057 /* The flow identifier has to be the same for flow updates. 1058 * Look for any overlapping flow. 1059 */ 1060 if (unlikely(!ovs_flow_cmp(flow, &match))) { 1061 if (ovs_identifier_is_key(&flow->id)) 1062 flow = ovs_flow_tbl_lookup_exact(&dp->table, 1063 &match); 1064 else /* UFID matches but key is different */ 1065 flow = NULL; 1066 if (!flow) { 1067 error = -ENOENT; 1068 goto err_unlock_ovs; 1069 } 1070 } 1071 /* Update actions. */ 1072 old_acts = ovsl_dereference(flow->sf_acts); 1073 rcu_assign_pointer(flow->sf_acts, acts); 1074 1075 if (unlikely(reply)) { 1076 error = ovs_flow_cmd_fill_info(flow, 1077 ovs_header->dp_ifindex, 1078 reply, info->snd_portid, 1079 info->snd_seq, 0, 1080 OVS_FLOW_CMD_NEW, 1081 ufid_flags); 1082 BUG_ON(error < 0); 1083 } 1084 ovs_unlock(); 1085 1086 ovs_nla_free_flow_actions_rcu(old_acts); 1087 ovs_flow_free(new_flow, false); 1088 } 1089 1090 if (reply) 1091 ovs_notify(&dp_flow_genl_family, reply, info); 1092 return 0; 1093 1094 err_unlock_ovs: 1095 ovs_unlock(); 1096 kfree_skb(reply); 1097 err_kfree_acts: 1098 ovs_nla_free_flow_actions(acts); 1099 err_kfree_flow: 1100 ovs_flow_free(new_flow, false); 1101 error: 1102 return error; 1103 } 1104 1105 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ 1106 static noinline_for_stack 1107 struct sw_flow_actions *get_flow_actions(struct net *net, 1108 const struct nlattr *a, 1109 const struct sw_flow_key *key, 1110 const struct sw_flow_mask *mask, 1111 bool log) 1112 { 1113 struct sw_flow_actions *acts; 1114 struct sw_flow_key masked_key; 1115 int error; 1116 1117 ovs_flow_mask_key(&masked_key, key, true, mask); 1118 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log); 1119 if (error) { 1120 OVS_NLERR(log, 1121 "Actions may not be safe on all matching packets"); 1122 return ERR_PTR(error); 1123 } 1124 1125 return acts; 1126 } 1127 1128 /* Factor out match-init and action-copy to avoid 1129 * "Wframe-larger-than=1024" warning. Because mask is only 1130 * used to get actions, we new a function to save some 1131 * stack space. 1132 * 1133 * If there are not key and action attrs, we return 0 1134 * directly. In the case, the caller will also not use the 1135 * match as before. If there is action attr, we try to get 1136 * actions and save them to *acts. Before returning from 1137 * the function, we reset the match->mask pointer. Because 1138 * we should not to return match object with dangling reference 1139 * to mask. 1140 * */ 1141 static noinline_for_stack int 1142 ovs_nla_init_match_and_action(struct net *net, 1143 struct sw_flow_match *match, 1144 struct sw_flow_key *key, 1145 struct nlattr **a, 1146 struct sw_flow_actions **acts, 1147 bool log) 1148 { 1149 struct sw_flow_mask mask; 1150 int error = 0; 1151 1152 if (a[OVS_FLOW_ATTR_KEY]) { 1153 ovs_match_init(match, key, true, &mask); 1154 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY], 1155 a[OVS_FLOW_ATTR_MASK], log); 1156 if (error) 1157 goto error; 1158 } 1159 1160 if (a[OVS_FLOW_ATTR_ACTIONS]) { 1161 if (!a[OVS_FLOW_ATTR_KEY]) { 1162 OVS_NLERR(log, 1163 "Flow key attribute not present in set flow."); 1164 error = -EINVAL; 1165 goto error; 1166 } 1167 1168 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key, 1169 &mask, log); 1170 if (IS_ERR(*acts)) { 1171 error = PTR_ERR(*acts); 1172 goto error; 1173 } 1174 } 1175 1176 /* On success, error is 0. */ 1177 error: 1178 match->mask = NULL; 1179 return error; 1180 } 1181 1182 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) 1183 { 1184 struct net *net = sock_net(skb->sk); 1185 struct nlattr **a = info->attrs; 1186 struct ovs_header *ovs_header = info->userhdr; 1187 struct sw_flow_key key; 1188 struct sw_flow *flow; 1189 struct sk_buff *reply = NULL; 1190 struct datapath *dp; 1191 struct sw_flow_actions *old_acts = NULL, *acts = NULL; 1192 struct sw_flow_match match; 1193 struct sw_flow_id sfid; 1194 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1195 int error = 0; 1196 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1197 bool ufid_present; 1198 1199 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); 1200 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) { 1201 OVS_NLERR(log, 1202 "Flow set message rejected, Key attribute missing."); 1203 return -EINVAL; 1204 } 1205 1206 error = ovs_nla_init_match_and_action(net, &match, &key, a, 1207 &acts, log); 1208 if (error) 1209 goto error; 1210 1211 if (acts) { 1212 /* Can allocate before locking if have acts. */ 1213 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false, 1214 ufid_flags); 1215 if (IS_ERR(reply)) { 1216 error = PTR_ERR(reply); 1217 goto err_kfree_acts; 1218 } 1219 } 1220 1221 ovs_lock(); 1222 dp = get_dp(net, ovs_header->dp_ifindex); 1223 if (unlikely(!dp)) { 1224 error = -ENODEV; 1225 goto err_unlock_ovs; 1226 } 1227 /* Check that the flow exists. */ 1228 if (ufid_present) 1229 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid); 1230 else 1231 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1232 if (unlikely(!flow)) { 1233 error = -ENOENT; 1234 goto err_unlock_ovs; 1235 } 1236 1237 /* Update actions, if present. */ 1238 if (likely(acts)) { 1239 old_acts = ovsl_dereference(flow->sf_acts); 1240 rcu_assign_pointer(flow->sf_acts, acts); 1241 1242 if (unlikely(reply)) { 1243 error = ovs_flow_cmd_fill_info(flow, 1244 ovs_header->dp_ifindex, 1245 reply, info->snd_portid, 1246 info->snd_seq, 0, 1247 OVS_FLOW_CMD_SET, 1248 ufid_flags); 1249 BUG_ON(error < 0); 1250 } 1251 } else { 1252 /* Could not alloc without acts before locking. */ 1253 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, 1254 info, OVS_FLOW_CMD_SET, false, 1255 ufid_flags); 1256 1257 if (IS_ERR(reply)) { 1258 error = PTR_ERR(reply); 1259 goto err_unlock_ovs; 1260 } 1261 } 1262 1263 /* Clear stats. */ 1264 if (a[OVS_FLOW_ATTR_CLEAR]) 1265 ovs_flow_stats_clear(flow); 1266 ovs_unlock(); 1267 1268 if (reply) 1269 ovs_notify(&dp_flow_genl_family, reply, info); 1270 if (old_acts) 1271 ovs_nla_free_flow_actions_rcu(old_acts); 1272 1273 return 0; 1274 1275 err_unlock_ovs: 1276 ovs_unlock(); 1277 kfree_skb(reply); 1278 err_kfree_acts: 1279 ovs_nla_free_flow_actions(acts); 1280 error: 1281 return error; 1282 } 1283 1284 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) 1285 { 1286 struct nlattr **a = info->attrs; 1287 struct ovs_header *ovs_header = info->userhdr; 1288 struct net *net = sock_net(skb->sk); 1289 struct sw_flow_key key; 1290 struct sk_buff *reply; 1291 struct sw_flow *flow; 1292 struct datapath *dp; 1293 struct sw_flow_match match; 1294 struct sw_flow_id ufid; 1295 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1296 int err = 0; 1297 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1298 bool ufid_present; 1299 1300 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1301 if (a[OVS_FLOW_ATTR_KEY]) { 1302 ovs_match_init(&match, &key, true, NULL); 1303 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL, 1304 log); 1305 } else if (!ufid_present) { 1306 OVS_NLERR(log, 1307 "Flow get message rejected, Key attribute missing."); 1308 err = -EINVAL; 1309 } 1310 if (err) 1311 return err; 1312 1313 ovs_lock(); 1314 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1315 if (!dp) { 1316 err = -ENODEV; 1317 goto unlock; 1318 } 1319 1320 if (ufid_present) 1321 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1322 else 1323 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1324 if (!flow) { 1325 err = -ENOENT; 1326 goto unlock; 1327 } 1328 1329 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, 1330 OVS_FLOW_CMD_GET, true, ufid_flags); 1331 if (IS_ERR(reply)) { 1332 err = PTR_ERR(reply); 1333 goto unlock; 1334 } 1335 1336 ovs_unlock(); 1337 return genlmsg_reply(reply, info); 1338 unlock: 1339 ovs_unlock(); 1340 return err; 1341 } 1342 1343 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) 1344 { 1345 struct nlattr **a = info->attrs; 1346 struct ovs_header *ovs_header = info->userhdr; 1347 struct net *net = sock_net(skb->sk); 1348 struct sw_flow_key key; 1349 struct sk_buff *reply; 1350 struct sw_flow *flow = NULL; 1351 struct datapath *dp; 1352 struct sw_flow_match match; 1353 struct sw_flow_id ufid; 1354 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1355 int err; 1356 bool log = !a[OVS_FLOW_ATTR_PROBE]; 1357 bool ufid_present; 1358 1359 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); 1360 if (a[OVS_FLOW_ATTR_KEY]) { 1361 ovs_match_init(&match, &key, true, NULL); 1362 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], 1363 NULL, log); 1364 if (unlikely(err)) 1365 return err; 1366 } 1367 1368 ovs_lock(); 1369 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 1370 if (unlikely(!dp)) { 1371 err = -ENODEV; 1372 goto unlock; 1373 } 1374 1375 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) { 1376 err = ovs_flow_tbl_flush(&dp->table); 1377 goto unlock; 1378 } 1379 1380 if (ufid_present) 1381 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); 1382 else 1383 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); 1384 if (unlikely(!flow)) { 1385 err = -ENOENT; 1386 goto unlock; 1387 } 1388 1389 ovs_flow_tbl_remove(&dp->table, flow); 1390 ovs_unlock(); 1391 1392 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, 1393 &flow->id, info, false, ufid_flags); 1394 if (likely(reply)) { 1395 if (!IS_ERR(reply)) { 1396 rcu_read_lock(); /*To keep RCU checker happy. */ 1397 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, 1398 reply, info->snd_portid, 1399 info->snd_seq, 0, 1400 OVS_FLOW_CMD_DEL, 1401 ufid_flags); 1402 rcu_read_unlock(); 1403 if (WARN_ON_ONCE(err < 0)) { 1404 kfree_skb(reply); 1405 goto out_free; 1406 } 1407 1408 ovs_notify(&dp_flow_genl_family, reply, info); 1409 } else { 1410 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, 1411 PTR_ERR(reply)); 1412 } 1413 } 1414 1415 out_free: 1416 ovs_flow_free(flow, true); 1417 return 0; 1418 unlock: 1419 ovs_unlock(); 1420 return err; 1421 } 1422 1423 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1424 { 1425 struct nlattr *a[__OVS_FLOW_ATTR_MAX]; 1426 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 1427 struct table_instance *ti; 1428 struct datapath *dp; 1429 u32 ufid_flags; 1430 int err; 1431 1432 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a, 1433 OVS_FLOW_ATTR_MAX, flow_policy, NULL); 1434 if (err) 1435 return err; 1436 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); 1437 1438 rcu_read_lock(); 1439 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 1440 if (!dp) { 1441 rcu_read_unlock(); 1442 return -ENODEV; 1443 } 1444 1445 ti = rcu_dereference(dp->table.ti); 1446 for (;;) { 1447 struct sw_flow *flow; 1448 u32 bucket, obj; 1449 1450 bucket = cb->args[0]; 1451 obj = cb->args[1]; 1452 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); 1453 if (!flow) 1454 break; 1455 1456 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, 1457 NETLINK_CB(cb->skb).portid, 1458 cb->nlh->nlmsg_seq, NLM_F_MULTI, 1459 OVS_FLOW_CMD_GET, ufid_flags) < 0) 1460 break; 1461 1462 cb->args[0] = bucket; 1463 cb->args[1] = obj; 1464 } 1465 rcu_read_unlock(); 1466 return skb->len; 1467 } 1468 1469 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { 1470 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, 1471 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, 1472 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, 1473 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, 1474 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, 1475 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, 1476 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, 1477 }; 1478 1479 static const struct genl_small_ops dp_flow_genl_ops[] = { 1480 { .cmd = OVS_FLOW_CMD_NEW, 1481 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1482 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1483 .doit = ovs_flow_cmd_new 1484 }, 1485 { .cmd = OVS_FLOW_CMD_DEL, 1486 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1487 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1488 .doit = ovs_flow_cmd_del 1489 }, 1490 { .cmd = OVS_FLOW_CMD_GET, 1491 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1492 .flags = 0, /* OK for unprivileged users. */ 1493 .doit = ovs_flow_cmd_get, 1494 .dumpit = ovs_flow_cmd_dump 1495 }, 1496 { .cmd = OVS_FLOW_CMD_SET, 1497 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1498 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 1499 .doit = ovs_flow_cmd_set, 1500 }, 1501 }; 1502 1503 static struct genl_family dp_flow_genl_family __ro_after_init = { 1504 .hdrsize = sizeof(struct ovs_header), 1505 .name = OVS_FLOW_FAMILY, 1506 .version = OVS_FLOW_VERSION, 1507 .maxattr = OVS_FLOW_ATTR_MAX, 1508 .policy = flow_policy, 1509 .netnsok = true, 1510 .parallel_ops = true, 1511 .small_ops = dp_flow_genl_ops, 1512 .n_small_ops = ARRAY_SIZE(dp_flow_genl_ops), 1513 .resv_start_op = OVS_FLOW_CMD_SET + 1, 1514 .mcgrps = &ovs_dp_flow_multicast_group, 1515 .n_mcgrps = 1, 1516 .module = THIS_MODULE, 1517 }; 1518 1519 static size_t ovs_dp_cmd_msg_size(void) 1520 { 1521 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); 1522 1523 msgsize += nla_total_size(IFNAMSIZ); 1524 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats)); 1525 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats)); 1526 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ 1527 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */ 1528 msgsize += nla_total_size(sizeof(u32) * nr_cpu_ids); /* OVS_DP_ATTR_PER_CPU_PIDS */ 1529 1530 return msgsize; 1531 } 1532 1533 /* Called with ovs_mutex. */ 1534 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, 1535 u32 portid, u32 seq, u32 flags, u8 cmd) 1536 { 1537 struct ovs_header *ovs_header; 1538 struct ovs_dp_stats dp_stats; 1539 struct ovs_dp_megaflow_stats dp_megaflow_stats; 1540 struct dp_nlsk_pids *pids = ovsl_dereference(dp->upcall_portids); 1541 int err, pids_len; 1542 1543 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, 1544 flags, cmd); 1545 if (!ovs_header) 1546 goto error; 1547 1548 ovs_header->dp_ifindex = get_dpifindex(dp); 1549 1550 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); 1551 if (err) 1552 goto nla_put_failure; 1553 1554 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); 1555 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), 1556 &dp_stats, OVS_DP_ATTR_PAD)) 1557 goto nla_put_failure; 1558 1559 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS, 1560 sizeof(struct ovs_dp_megaflow_stats), 1561 &dp_megaflow_stats, OVS_DP_ATTR_PAD)) 1562 goto nla_put_failure; 1563 1564 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) 1565 goto nla_put_failure; 1566 1567 if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE, 1568 ovs_flow_tbl_masks_cache_size(&dp->table))) 1569 goto nla_put_failure; 1570 1571 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU && pids) { 1572 pids_len = min(pids->n_pids, nr_cpu_ids) * sizeof(u32); 1573 if (nla_put(skb, OVS_DP_ATTR_PER_CPU_PIDS, pids_len, &pids->pids)) 1574 goto nla_put_failure; 1575 } 1576 1577 genlmsg_end(skb, ovs_header); 1578 return 0; 1579 1580 nla_put_failure: 1581 genlmsg_cancel(skb, ovs_header); 1582 error: 1583 return -EMSGSIZE; 1584 } 1585 1586 static struct sk_buff *ovs_dp_cmd_alloc_info(void) 1587 { 1588 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL); 1589 } 1590 1591 /* Called with rcu_read_lock or ovs_mutex. */ 1592 static struct datapath *lookup_datapath(struct net *net, 1593 const struct ovs_header *ovs_header, 1594 struct nlattr *a[OVS_DP_ATTR_MAX + 1]) 1595 { 1596 struct datapath *dp; 1597 1598 if (!a[OVS_DP_ATTR_NAME]) 1599 dp = get_dp(net, ovs_header->dp_ifindex); 1600 else { 1601 struct vport *vport; 1602 1603 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); 1604 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; 1605 } 1606 return dp ? dp : ERR_PTR(-ENODEV); 1607 } 1608 1609 static void ovs_dp_reset_user_features(struct sk_buff *skb, 1610 struct genl_info *info) 1611 { 1612 struct datapath *dp; 1613 1614 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, 1615 info->attrs); 1616 if (IS_ERR(dp)) 1617 return; 1618 1619 WARN(dp->user_features, "Dropping previously announced user features\n"); 1620 dp->user_features = 0; 1621 } 1622 1623 static int ovs_dp_set_upcall_portids(struct datapath *dp, 1624 const struct nlattr *ids) 1625 { 1626 struct dp_nlsk_pids *old, *dp_nlsk_pids; 1627 1628 if (!nla_len(ids) || nla_len(ids) % sizeof(u32)) 1629 return -EINVAL; 1630 1631 old = ovsl_dereference(dp->upcall_portids); 1632 1633 dp_nlsk_pids = kmalloc(sizeof(*dp_nlsk_pids) + nla_len(ids), 1634 GFP_KERNEL); 1635 if (!dp_nlsk_pids) 1636 return -ENOMEM; 1637 1638 dp_nlsk_pids->n_pids = nla_len(ids) / sizeof(u32); 1639 nla_memcpy(dp_nlsk_pids->pids, ids, nla_len(ids)); 1640 1641 rcu_assign_pointer(dp->upcall_portids, dp_nlsk_pids); 1642 1643 kfree_rcu(old, rcu); 1644 1645 return 0; 1646 } 1647 1648 u32 ovs_dp_get_upcall_portid(const struct datapath *dp, uint32_t cpu_id) 1649 { 1650 struct dp_nlsk_pids *dp_nlsk_pids; 1651 1652 dp_nlsk_pids = rcu_dereference(dp->upcall_portids); 1653 1654 if (dp_nlsk_pids) { 1655 if (cpu_id < dp_nlsk_pids->n_pids) { 1656 return dp_nlsk_pids->pids[cpu_id]; 1657 } else if (dp_nlsk_pids->n_pids > 0 && 1658 cpu_id >= dp_nlsk_pids->n_pids) { 1659 /* If the number of netlink PIDs is mismatched with 1660 * the number of CPUs as seen by the kernel, log this 1661 * and send the upcall to an arbitrary socket (0) in 1662 * order to not drop packets 1663 */ 1664 pr_info_ratelimited("cpu_id mismatch with handler threads"); 1665 return dp_nlsk_pids->pids[cpu_id % 1666 dp_nlsk_pids->n_pids]; 1667 } else { 1668 return 0; 1669 } 1670 } else { 1671 return 0; 1672 } 1673 } 1674 1675 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1676 { 1677 u32 user_features = 0, old_features = dp->user_features; 1678 int err; 1679 1680 if (a[OVS_DP_ATTR_USER_FEATURES]) { 1681 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1682 1683 if (user_features & ~(OVS_DP_F_VPORT_PIDS | 1684 OVS_DP_F_UNALIGNED | 1685 OVS_DP_F_TC_RECIRC_SHARING | 1686 OVS_DP_F_DISPATCH_UPCALL_PER_CPU)) 1687 return -EOPNOTSUPP; 1688 1689 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT) 1690 if (user_features & OVS_DP_F_TC_RECIRC_SHARING) 1691 return -EOPNOTSUPP; 1692 #endif 1693 } 1694 1695 if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) { 1696 int err; 1697 u32 cache_size; 1698 1699 cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]); 1700 err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size); 1701 if (err) 1702 return err; 1703 } 1704 1705 dp->user_features = user_features; 1706 1707 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU && 1708 a[OVS_DP_ATTR_PER_CPU_PIDS]) { 1709 /* Upcall Netlink Port IDs have been updated */ 1710 err = ovs_dp_set_upcall_portids(dp, 1711 a[OVS_DP_ATTR_PER_CPU_PIDS]); 1712 if (err) 1713 return err; 1714 } 1715 1716 if ((dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) && 1717 !(old_features & OVS_DP_F_TC_RECIRC_SHARING)) 1718 tc_skb_ext_tc_enable(); 1719 else if (!(dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) && 1720 (old_features & OVS_DP_F_TC_RECIRC_SHARING)) 1721 tc_skb_ext_tc_disable(); 1722 1723 return 0; 1724 } 1725 1726 static int ovs_dp_stats_init(struct datapath *dp) 1727 { 1728 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1729 if (!dp->stats_percpu) 1730 return -ENOMEM; 1731 1732 return 0; 1733 } 1734 1735 static int ovs_dp_vport_init(struct datapath *dp) 1736 { 1737 int i; 1738 1739 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS, 1740 sizeof(struct hlist_head), 1741 GFP_KERNEL); 1742 if (!dp->ports) 1743 return -ENOMEM; 1744 1745 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1746 INIT_HLIST_HEAD(&dp->ports[i]); 1747 1748 return 0; 1749 } 1750 1751 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1752 { 1753 struct nlattr **a = info->attrs; 1754 struct vport_parms parms; 1755 struct sk_buff *reply; 1756 struct datapath *dp; 1757 struct vport *vport; 1758 struct ovs_net *ovs_net; 1759 int err; 1760 1761 err = -EINVAL; 1762 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1763 goto err; 1764 1765 reply = ovs_dp_cmd_alloc_info(); 1766 if (!reply) 1767 return -ENOMEM; 1768 1769 err = -ENOMEM; 1770 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1771 if (dp == NULL) 1772 goto err_destroy_reply; 1773 1774 ovs_dp_set_net(dp, sock_net(skb->sk)); 1775 1776 /* Allocate table. */ 1777 err = ovs_flow_tbl_init(&dp->table); 1778 if (err) 1779 goto err_destroy_dp; 1780 1781 err = ovs_dp_stats_init(dp); 1782 if (err) 1783 goto err_destroy_table; 1784 1785 err = ovs_dp_vport_init(dp); 1786 if (err) 1787 goto err_destroy_stats; 1788 1789 err = ovs_meters_init(dp); 1790 if (err) 1791 goto err_destroy_ports; 1792 1793 /* Set up our datapath device. */ 1794 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1795 parms.type = OVS_VPORT_TYPE_INTERNAL; 1796 parms.options = NULL; 1797 parms.dp = dp; 1798 parms.port_no = OVSP_LOCAL; 1799 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1800 parms.desired_ifindex = a[OVS_DP_ATTR_IFINDEX] 1801 ? nla_get_u32(a[OVS_DP_ATTR_IFINDEX]) : 0; 1802 1803 /* So far only local changes have been made, now need the lock. */ 1804 ovs_lock(); 1805 1806 err = ovs_dp_change(dp, a); 1807 if (err) 1808 goto err_unlock_and_destroy_meters; 1809 1810 vport = new_vport(&parms); 1811 if (IS_ERR(vport)) { 1812 err = PTR_ERR(vport); 1813 if (err == -EBUSY) 1814 err = -EEXIST; 1815 1816 if (err == -EEXIST) { 1817 /* An outdated user space instance that does not understand 1818 * the concept of user_features has attempted to create a new 1819 * datapath and is likely to reuse it. Drop all user features. 1820 */ 1821 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1822 ovs_dp_reset_user_features(skb, info); 1823 } 1824 1825 goto err_destroy_portids; 1826 } 1827 1828 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1829 info->snd_seq, 0, OVS_DP_CMD_NEW); 1830 BUG_ON(err < 0); 1831 1832 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1833 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1834 1835 ovs_unlock(); 1836 1837 ovs_notify(&dp_datapath_genl_family, reply, info); 1838 return 0; 1839 1840 err_destroy_portids: 1841 kfree(rcu_dereference_raw(dp->upcall_portids)); 1842 err_unlock_and_destroy_meters: 1843 ovs_unlock(); 1844 ovs_meters_exit(dp); 1845 err_destroy_ports: 1846 kfree(dp->ports); 1847 err_destroy_stats: 1848 free_percpu(dp->stats_percpu); 1849 err_destroy_table: 1850 ovs_flow_tbl_destroy(&dp->table); 1851 err_destroy_dp: 1852 kfree(dp); 1853 err_destroy_reply: 1854 kfree_skb(reply); 1855 err: 1856 return err; 1857 } 1858 1859 /* Called with ovs_mutex. */ 1860 static void __dp_destroy(struct datapath *dp) 1861 { 1862 struct flow_table *table = &dp->table; 1863 int i; 1864 1865 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) 1866 tc_skb_ext_tc_disable(); 1867 1868 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1869 struct vport *vport; 1870 struct hlist_node *n; 1871 1872 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1873 if (vport->port_no != OVSP_LOCAL) 1874 ovs_dp_detach_port(vport); 1875 } 1876 1877 list_del_rcu(&dp->list_node); 1878 1879 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1880 * all ports in datapath are destroyed first before freeing datapath. 1881 */ 1882 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1883 1884 /* Flush sw_flow in the tables. RCU cb only releases resource 1885 * such as dp, ports and tables. That may avoid some issues 1886 * such as RCU usage warning. 1887 */ 1888 table_instance_flow_flush(table, ovsl_dereference(table->ti), 1889 ovsl_dereference(table->ufid_ti)); 1890 1891 /* RCU destroy the ports, meters and flow tables. */ 1892 call_rcu(&dp->rcu, destroy_dp_rcu); 1893 } 1894 1895 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1896 { 1897 struct sk_buff *reply; 1898 struct datapath *dp; 1899 int err; 1900 1901 reply = ovs_dp_cmd_alloc_info(); 1902 if (!reply) 1903 return -ENOMEM; 1904 1905 ovs_lock(); 1906 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1907 err = PTR_ERR(dp); 1908 if (IS_ERR(dp)) 1909 goto err_unlock_free; 1910 1911 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1912 info->snd_seq, 0, OVS_DP_CMD_DEL); 1913 BUG_ON(err < 0); 1914 1915 __dp_destroy(dp); 1916 ovs_unlock(); 1917 1918 ovs_notify(&dp_datapath_genl_family, reply, info); 1919 1920 return 0; 1921 1922 err_unlock_free: 1923 ovs_unlock(); 1924 kfree_skb(reply); 1925 return err; 1926 } 1927 1928 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1929 { 1930 struct sk_buff *reply; 1931 struct datapath *dp; 1932 int err; 1933 1934 reply = ovs_dp_cmd_alloc_info(); 1935 if (!reply) 1936 return -ENOMEM; 1937 1938 ovs_lock(); 1939 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1940 err = PTR_ERR(dp); 1941 if (IS_ERR(dp)) 1942 goto err_unlock_free; 1943 1944 err = ovs_dp_change(dp, info->attrs); 1945 if (err) 1946 goto err_unlock_free; 1947 1948 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1949 info->snd_seq, 0, OVS_DP_CMD_SET); 1950 BUG_ON(err < 0); 1951 1952 ovs_unlock(); 1953 ovs_notify(&dp_datapath_genl_family, reply, info); 1954 1955 return 0; 1956 1957 err_unlock_free: 1958 ovs_unlock(); 1959 kfree_skb(reply); 1960 return err; 1961 } 1962 1963 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1964 { 1965 struct sk_buff *reply; 1966 struct datapath *dp; 1967 int err; 1968 1969 reply = ovs_dp_cmd_alloc_info(); 1970 if (!reply) 1971 return -ENOMEM; 1972 1973 ovs_lock(); 1974 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1975 if (IS_ERR(dp)) { 1976 err = PTR_ERR(dp); 1977 goto err_unlock_free; 1978 } 1979 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1980 info->snd_seq, 0, OVS_DP_CMD_GET); 1981 BUG_ON(err < 0); 1982 ovs_unlock(); 1983 1984 return genlmsg_reply(reply, info); 1985 1986 err_unlock_free: 1987 ovs_unlock(); 1988 kfree_skb(reply); 1989 return err; 1990 } 1991 1992 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1993 { 1994 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1995 struct datapath *dp; 1996 int skip = cb->args[0]; 1997 int i = 0; 1998 1999 ovs_lock(); 2000 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2001 if (i >= skip && 2002 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 2003 cb->nlh->nlmsg_seq, NLM_F_MULTI, 2004 OVS_DP_CMD_GET) < 0) 2005 break; 2006 i++; 2007 } 2008 ovs_unlock(); 2009 2010 cb->args[0] = i; 2011 2012 return skb->len; 2013 } 2014 2015 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 2016 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2017 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 2018 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 2019 [OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0, 2020 PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)), 2021 [OVS_DP_ATTR_IFINDEX] = {.type = NLA_U32 }, 2022 }; 2023 2024 static const struct genl_small_ops dp_datapath_genl_ops[] = { 2025 { .cmd = OVS_DP_CMD_NEW, 2026 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2027 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2028 .doit = ovs_dp_cmd_new 2029 }, 2030 { .cmd = OVS_DP_CMD_DEL, 2031 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2032 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2033 .doit = ovs_dp_cmd_del 2034 }, 2035 { .cmd = OVS_DP_CMD_GET, 2036 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2037 .flags = 0, /* OK for unprivileged users. */ 2038 .doit = ovs_dp_cmd_get, 2039 .dumpit = ovs_dp_cmd_dump 2040 }, 2041 { .cmd = OVS_DP_CMD_SET, 2042 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2043 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2044 .doit = ovs_dp_cmd_set, 2045 }, 2046 }; 2047 2048 static struct genl_family dp_datapath_genl_family __ro_after_init = { 2049 .hdrsize = sizeof(struct ovs_header), 2050 .name = OVS_DATAPATH_FAMILY, 2051 .version = OVS_DATAPATH_VERSION, 2052 .maxattr = OVS_DP_ATTR_MAX, 2053 .policy = datapath_policy, 2054 .netnsok = true, 2055 .parallel_ops = true, 2056 .small_ops = dp_datapath_genl_ops, 2057 .n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops), 2058 .resv_start_op = OVS_DP_CMD_SET + 1, 2059 .mcgrps = &ovs_dp_datapath_multicast_group, 2060 .n_mcgrps = 1, 2061 .module = THIS_MODULE, 2062 }; 2063 2064 /* Called with ovs_mutex or RCU read lock. */ 2065 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 2066 struct net *net, u32 portid, u32 seq, 2067 u32 flags, u8 cmd, gfp_t gfp) 2068 { 2069 struct ovs_header *ovs_header; 2070 struct ovs_vport_stats vport_stats; 2071 int err; 2072 2073 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 2074 flags, cmd); 2075 if (!ovs_header) 2076 return -EMSGSIZE; 2077 2078 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 2079 2080 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 2081 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 2082 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 2083 ovs_vport_name(vport)) || 2084 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex)) 2085 goto nla_put_failure; 2086 2087 if (!net_eq(net, dev_net(vport->dev))) { 2088 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp); 2089 2090 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id)) 2091 goto nla_put_failure; 2092 } 2093 2094 ovs_vport_get_stats(vport, &vport_stats); 2095 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS, 2096 sizeof(struct ovs_vport_stats), &vport_stats, 2097 OVS_VPORT_ATTR_PAD)) 2098 goto nla_put_failure; 2099 2100 if (ovs_vport_get_upcall_portids(vport, skb)) 2101 goto nla_put_failure; 2102 2103 err = ovs_vport_get_options(vport, skb); 2104 if (err == -EMSGSIZE) 2105 goto error; 2106 2107 genlmsg_end(skb, ovs_header); 2108 return 0; 2109 2110 nla_put_failure: 2111 err = -EMSGSIZE; 2112 error: 2113 genlmsg_cancel(skb, ovs_header); 2114 return err; 2115 } 2116 2117 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 2118 { 2119 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2120 } 2121 2122 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 2123 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net, 2124 u32 portid, u32 seq, u8 cmd) 2125 { 2126 struct sk_buff *skb; 2127 int retval; 2128 2129 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2130 if (!skb) 2131 return ERR_PTR(-ENOMEM); 2132 2133 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd, 2134 GFP_KERNEL); 2135 BUG_ON(retval < 0); 2136 2137 return skb; 2138 } 2139 2140 /* Called with ovs_mutex or RCU read lock. */ 2141 static struct vport *lookup_vport(struct net *net, 2142 const struct ovs_header *ovs_header, 2143 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 2144 { 2145 struct datapath *dp; 2146 struct vport *vport; 2147 2148 if (a[OVS_VPORT_ATTR_IFINDEX]) 2149 return ERR_PTR(-EOPNOTSUPP); 2150 if (a[OVS_VPORT_ATTR_NAME]) { 2151 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 2152 if (!vport) 2153 return ERR_PTR(-ENODEV); 2154 if (ovs_header->dp_ifindex && 2155 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 2156 return ERR_PTR(-ENODEV); 2157 return vport; 2158 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 2159 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 2160 2161 if (port_no >= DP_MAX_PORTS) 2162 return ERR_PTR(-EFBIG); 2163 2164 dp = get_dp(net, ovs_header->dp_ifindex); 2165 if (!dp) 2166 return ERR_PTR(-ENODEV); 2167 2168 vport = ovs_vport_ovsl_rcu(dp, port_no); 2169 if (!vport) 2170 return ERR_PTR(-ENODEV); 2171 return vport; 2172 } else 2173 return ERR_PTR(-EINVAL); 2174 2175 } 2176 2177 static unsigned int ovs_get_max_headroom(struct datapath *dp) 2178 { 2179 unsigned int dev_headroom, max_headroom = 0; 2180 struct net_device *dev; 2181 struct vport *vport; 2182 int i; 2183 2184 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2185 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, 2186 lockdep_ovsl_is_held()) { 2187 dev = vport->dev; 2188 dev_headroom = netdev_get_fwd_headroom(dev); 2189 if (dev_headroom > max_headroom) 2190 max_headroom = dev_headroom; 2191 } 2192 } 2193 2194 return max_headroom; 2195 } 2196 2197 /* Called with ovs_mutex */ 2198 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom) 2199 { 2200 struct vport *vport; 2201 int i; 2202 2203 dp->max_headroom = new_headroom; 2204 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2205 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, 2206 lockdep_ovsl_is_held()) 2207 netdev_set_rx_headroom(vport->dev, new_headroom); 2208 } 2209 } 2210 2211 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 2212 { 2213 struct nlattr **a = info->attrs; 2214 struct ovs_header *ovs_header = info->userhdr; 2215 struct vport_parms parms; 2216 struct sk_buff *reply; 2217 struct vport *vport; 2218 struct datapath *dp; 2219 unsigned int new_headroom; 2220 u32 port_no; 2221 int err; 2222 2223 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 2224 !a[OVS_VPORT_ATTR_UPCALL_PID]) 2225 return -EINVAL; 2226 2227 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 2228 2229 if (a[OVS_VPORT_ATTR_IFINDEX] && parms.type != OVS_VPORT_TYPE_INTERNAL) 2230 return -EOPNOTSUPP; 2231 2232 port_no = a[OVS_VPORT_ATTR_PORT_NO] 2233 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 2234 if (port_no >= DP_MAX_PORTS) 2235 return -EFBIG; 2236 2237 reply = ovs_vport_cmd_alloc_info(); 2238 if (!reply) 2239 return -ENOMEM; 2240 2241 ovs_lock(); 2242 restart: 2243 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 2244 err = -ENODEV; 2245 if (!dp) 2246 goto exit_unlock_free; 2247 2248 if (port_no) { 2249 vport = ovs_vport_ovsl(dp, port_no); 2250 err = -EBUSY; 2251 if (vport) 2252 goto exit_unlock_free; 2253 } else { 2254 for (port_no = 1; ; port_no++) { 2255 if (port_no >= DP_MAX_PORTS) { 2256 err = -EFBIG; 2257 goto exit_unlock_free; 2258 } 2259 vport = ovs_vport_ovsl(dp, port_no); 2260 if (!vport) 2261 break; 2262 } 2263 } 2264 2265 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 2266 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 2267 parms.dp = dp; 2268 parms.port_no = port_no; 2269 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2270 parms.desired_ifindex = a[OVS_VPORT_ATTR_IFINDEX] 2271 ? nla_get_u32(a[OVS_VPORT_ATTR_IFINDEX]) : 0; 2272 2273 vport = new_vport(&parms); 2274 err = PTR_ERR(vport); 2275 if (IS_ERR(vport)) { 2276 if (err == -EAGAIN) 2277 goto restart; 2278 goto exit_unlock_free; 2279 } 2280 2281 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2282 info->snd_portid, info->snd_seq, 0, 2283 OVS_VPORT_CMD_NEW, GFP_KERNEL); 2284 2285 new_headroom = netdev_get_fwd_headroom(vport->dev); 2286 2287 if (new_headroom > dp->max_headroom) 2288 ovs_update_headroom(dp, new_headroom); 2289 else 2290 netdev_set_rx_headroom(vport->dev, dp->max_headroom); 2291 2292 BUG_ON(err < 0); 2293 ovs_unlock(); 2294 2295 ovs_notify(&dp_vport_genl_family, reply, info); 2296 return 0; 2297 2298 exit_unlock_free: 2299 ovs_unlock(); 2300 kfree_skb(reply); 2301 return err; 2302 } 2303 2304 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 2305 { 2306 struct nlattr **a = info->attrs; 2307 struct sk_buff *reply; 2308 struct vport *vport; 2309 int err; 2310 2311 reply = ovs_vport_cmd_alloc_info(); 2312 if (!reply) 2313 return -ENOMEM; 2314 2315 ovs_lock(); 2316 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2317 err = PTR_ERR(vport); 2318 if (IS_ERR(vport)) 2319 goto exit_unlock_free; 2320 2321 if (a[OVS_VPORT_ATTR_TYPE] && 2322 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 2323 err = -EINVAL; 2324 goto exit_unlock_free; 2325 } 2326 2327 if (a[OVS_VPORT_ATTR_OPTIONS]) { 2328 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 2329 if (err) 2330 goto exit_unlock_free; 2331 } 2332 2333 2334 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 2335 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2336 2337 err = ovs_vport_set_upcall_portids(vport, ids); 2338 if (err) 2339 goto exit_unlock_free; 2340 } 2341 2342 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2343 info->snd_portid, info->snd_seq, 0, 2344 OVS_VPORT_CMD_SET, GFP_KERNEL); 2345 BUG_ON(err < 0); 2346 2347 ovs_unlock(); 2348 ovs_notify(&dp_vport_genl_family, reply, info); 2349 return 0; 2350 2351 exit_unlock_free: 2352 ovs_unlock(); 2353 kfree_skb(reply); 2354 return err; 2355 } 2356 2357 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2358 { 2359 bool update_headroom = false; 2360 struct nlattr **a = info->attrs; 2361 struct sk_buff *reply; 2362 struct datapath *dp; 2363 struct vport *vport; 2364 unsigned int new_headroom; 2365 int err; 2366 2367 reply = ovs_vport_cmd_alloc_info(); 2368 if (!reply) 2369 return -ENOMEM; 2370 2371 ovs_lock(); 2372 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2373 err = PTR_ERR(vport); 2374 if (IS_ERR(vport)) 2375 goto exit_unlock_free; 2376 2377 if (vport->port_no == OVSP_LOCAL) { 2378 err = -EINVAL; 2379 goto exit_unlock_free; 2380 } 2381 2382 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2383 info->snd_portid, info->snd_seq, 0, 2384 OVS_VPORT_CMD_DEL, GFP_KERNEL); 2385 BUG_ON(err < 0); 2386 2387 /* the vport deletion may trigger dp headroom update */ 2388 dp = vport->dp; 2389 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom) 2390 update_headroom = true; 2391 2392 netdev_reset_rx_headroom(vport->dev); 2393 ovs_dp_detach_port(vport); 2394 2395 if (update_headroom) { 2396 new_headroom = ovs_get_max_headroom(dp); 2397 2398 if (new_headroom < dp->max_headroom) 2399 ovs_update_headroom(dp, new_headroom); 2400 } 2401 ovs_unlock(); 2402 2403 ovs_notify(&dp_vport_genl_family, reply, info); 2404 return 0; 2405 2406 exit_unlock_free: 2407 ovs_unlock(); 2408 kfree_skb(reply); 2409 return err; 2410 } 2411 2412 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2413 { 2414 struct nlattr **a = info->attrs; 2415 struct ovs_header *ovs_header = info->userhdr; 2416 struct sk_buff *reply; 2417 struct vport *vport; 2418 int err; 2419 2420 reply = ovs_vport_cmd_alloc_info(); 2421 if (!reply) 2422 return -ENOMEM; 2423 2424 rcu_read_lock(); 2425 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2426 err = PTR_ERR(vport); 2427 if (IS_ERR(vport)) 2428 goto exit_unlock_free; 2429 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2430 info->snd_portid, info->snd_seq, 0, 2431 OVS_VPORT_CMD_GET, GFP_ATOMIC); 2432 BUG_ON(err < 0); 2433 rcu_read_unlock(); 2434 2435 return genlmsg_reply(reply, info); 2436 2437 exit_unlock_free: 2438 rcu_read_unlock(); 2439 kfree_skb(reply); 2440 return err; 2441 } 2442 2443 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2444 { 2445 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2446 struct datapath *dp; 2447 int bucket = cb->args[0], skip = cb->args[1]; 2448 int i, j = 0; 2449 2450 rcu_read_lock(); 2451 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2452 if (!dp) { 2453 rcu_read_unlock(); 2454 return -ENODEV; 2455 } 2456 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2457 struct vport *vport; 2458 2459 j = 0; 2460 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2461 if (j >= skip && 2462 ovs_vport_cmd_fill_info(vport, skb, 2463 sock_net(skb->sk), 2464 NETLINK_CB(cb->skb).portid, 2465 cb->nlh->nlmsg_seq, 2466 NLM_F_MULTI, 2467 OVS_VPORT_CMD_GET, 2468 GFP_ATOMIC) < 0) 2469 goto out; 2470 2471 j++; 2472 } 2473 skip = 0; 2474 } 2475 out: 2476 rcu_read_unlock(); 2477 2478 cb->args[0] = i; 2479 cb->args[1] = j; 2480 2481 return skb->len; 2482 } 2483 2484 static void ovs_dp_masks_rebalance(struct work_struct *work) 2485 { 2486 struct ovs_net *ovs_net = container_of(work, struct ovs_net, 2487 masks_rebalance.work); 2488 struct datapath *dp; 2489 2490 ovs_lock(); 2491 2492 list_for_each_entry(dp, &ovs_net->dps, list_node) 2493 ovs_flow_masks_rebalance(&dp->table); 2494 2495 ovs_unlock(); 2496 2497 schedule_delayed_work(&ovs_net->masks_rebalance, 2498 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL)); 2499 } 2500 2501 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2502 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2503 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2504 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2505 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2506 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC }, 2507 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2508 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 }, 2509 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 }, 2510 }; 2511 2512 static const struct genl_small_ops dp_vport_genl_ops[] = { 2513 { .cmd = OVS_VPORT_CMD_NEW, 2514 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2515 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2516 .doit = ovs_vport_cmd_new 2517 }, 2518 { .cmd = OVS_VPORT_CMD_DEL, 2519 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2520 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2521 .doit = ovs_vport_cmd_del 2522 }, 2523 { .cmd = OVS_VPORT_CMD_GET, 2524 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2525 .flags = 0, /* OK for unprivileged users. */ 2526 .doit = ovs_vport_cmd_get, 2527 .dumpit = ovs_vport_cmd_dump 2528 }, 2529 { .cmd = OVS_VPORT_CMD_SET, 2530 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2531 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2532 .doit = ovs_vport_cmd_set, 2533 }, 2534 }; 2535 2536 struct genl_family dp_vport_genl_family __ro_after_init = { 2537 .hdrsize = sizeof(struct ovs_header), 2538 .name = OVS_VPORT_FAMILY, 2539 .version = OVS_VPORT_VERSION, 2540 .maxattr = OVS_VPORT_ATTR_MAX, 2541 .policy = vport_policy, 2542 .netnsok = true, 2543 .parallel_ops = true, 2544 .small_ops = dp_vport_genl_ops, 2545 .n_small_ops = ARRAY_SIZE(dp_vport_genl_ops), 2546 .mcgrps = &ovs_dp_vport_multicast_group, 2547 .n_mcgrps = 1, 2548 .module = THIS_MODULE, 2549 }; 2550 2551 static struct genl_family * const dp_genl_families[] = { 2552 &dp_datapath_genl_family, 2553 &dp_vport_genl_family, 2554 &dp_flow_genl_family, 2555 &dp_packet_genl_family, 2556 &dp_meter_genl_family, 2557 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 2558 &dp_ct_limit_genl_family, 2559 #endif 2560 }; 2561 2562 static void dp_unregister_genl(int n_families) 2563 { 2564 int i; 2565 2566 for (i = 0; i < n_families; i++) 2567 genl_unregister_family(dp_genl_families[i]); 2568 } 2569 2570 static int __init dp_register_genl(void) 2571 { 2572 int err; 2573 int i; 2574 2575 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2576 2577 err = genl_register_family(dp_genl_families[i]); 2578 if (err) 2579 goto error; 2580 } 2581 2582 return 0; 2583 2584 error: 2585 dp_unregister_genl(i); 2586 return err; 2587 } 2588 2589 static int __net_init ovs_init_net(struct net *net) 2590 { 2591 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2592 int err; 2593 2594 INIT_LIST_HEAD(&ovs_net->dps); 2595 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2596 INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance); 2597 2598 err = ovs_ct_init(net); 2599 if (err) 2600 return err; 2601 2602 schedule_delayed_work(&ovs_net->masks_rebalance, 2603 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL)); 2604 return 0; 2605 } 2606 2607 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2608 struct list_head *head) 2609 { 2610 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2611 struct datapath *dp; 2612 2613 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2614 int i; 2615 2616 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2617 struct vport *vport; 2618 2619 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2620 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2621 continue; 2622 2623 if (dev_net(vport->dev) == dnet) 2624 list_add(&vport->detach_list, head); 2625 } 2626 } 2627 } 2628 } 2629 2630 static void __net_exit ovs_exit_net(struct net *dnet) 2631 { 2632 struct datapath *dp, *dp_next; 2633 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2634 struct vport *vport, *vport_next; 2635 struct net *net; 2636 LIST_HEAD(head); 2637 2638 ovs_lock(); 2639 2640 ovs_ct_exit(dnet); 2641 2642 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2643 __dp_destroy(dp); 2644 2645 down_read(&net_rwsem); 2646 for_each_net(net) 2647 list_vports_from_net(net, dnet, &head); 2648 up_read(&net_rwsem); 2649 2650 /* Detach all vports from given namespace. */ 2651 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2652 list_del(&vport->detach_list); 2653 ovs_dp_detach_port(vport); 2654 } 2655 2656 ovs_unlock(); 2657 2658 cancel_delayed_work_sync(&ovs_net->masks_rebalance); 2659 cancel_work_sync(&ovs_net->dp_notify_work); 2660 } 2661 2662 static struct pernet_operations ovs_net_ops = { 2663 .init = ovs_init_net, 2664 .exit = ovs_exit_net, 2665 .id = &ovs_net_id, 2666 .size = sizeof(struct ovs_net), 2667 }; 2668 2669 static int __init dp_init(void) 2670 { 2671 int err; 2672 2673 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > 2674 sizeof_field(struct sk_buff, cb)); 2675 2676 pr_info("Open vSwitch switching datapath\n"); 2677 2678 err = action_fifos_init(); 2679 if (err) 2680 goto error; 2681 2682 err = ovs_internal_dev_rtnl_link_register(); 2683 if (err) 2684 goto error_action_fifos_exit; 2685 2686 err = ovs_flow_init(); 2687 if (err) 2688 goto error_unreg_rtnl_link; 2689 2690 err = ovs_vport_init(); 2691 if (err) 2692 goto error_flow_exit; 2693 2694 err = register_pernet_device(&ovs_net_ops); 2695 if (err) 2696 goto error_vport_exit; 2697 2698 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2699 if (err) 2700 goto error_netns_exit; 2701 2702 err = ovs_netdev_init(); 2703 if (err) 2704 goto error_unreg_notifier; 2705 2706 err = dp_register_genl(); 2707 if (err < 0) 2708 goto error_unreg_netdev; 2709 2710 return 0; 2711 2712 error_unreg_netdev: 2713 ovs_netdev_exit(); 2714 error_unreg_notifier: 2715 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2716 error_netns_exit: 2717 unregister_pernet_device(&ovs_net_ops); 2718 error_vport_exit: 2719 ovs_vport_exit(); 2720 error_flow_exit: 2721 ovs_flow_exit(); 2722 error_unreg_rtnl_link: 2723 ovs_internal_dev_rtnl_link_unregister(); 2724 error_action_fifos_exit: 2725 action_fifos_exit(); 2726 error: 2727 return err; 2728 } 2729 2730 static void dp_cleanup(void) 2731 { 2732 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2733 ovs_netdev_exit(); 2734 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2735 unregister_pernet_device(&ovs_net_ops); 2736 rcu_barrier(); 2737 ovs_vport_exit(); 2738 ovs_flow_exit(); 2739 ovs_internal_dev_rtnl_link_unregister(); 2740 action_fifos_exit(); 2741 } 2742 2743 module_init(dp_init); 2744 module_exit(dp_cleanup); 2745 2746 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2747 MODULE_LICENSE("GPL"); 2748 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY); 2749 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY); 2750 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY); 2751 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY); 2752 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY); 2753 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY); 2754