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 pr_warn("%s: Dropping previously announced user features\n", 1620 ovs_dp_name(dp)); 1621 dp->user_features = 0; 1622 } 1623 1624 static int ovs_dp_set_upcall_portids(struct datapath *dp, 1625 const struct nlattr *ids) 1626 { 1627 struct dp_nlsk_pids *old, *dp_nlsk_pids; 1628 1629 if (!nla_len(ids) || nla_len(ids) % sizeof(u32)) 1630 return -EINVAL; 1631 1632 old = ovsl_dereference(dp->upcall_portids); 1633 1634 dp_nlsk_pids = kmalloc(sizeof(*dp_nlsk_pids) + nla_len(ids), 1635 GFP_KERNEL); 1636 if (!dp_nlsk_pids) 1637 return -ENOMEM; 1638 1639 dp_nlsk_pids->n_pids = nla_len(ids) / sizeof(u32); 1640 nla_memcpy(dp_nlsk_pids->pids, ids, nla_len(ids)); 1641 1642 rcu_assign_pointer(dp->upcall_portids, dp_nlsk_pids); 1643 1644 kfree_rcu(old, rcu); 1645 1646 return 0; 1647 } 1648 1649 u32 ovs_dp_get_upcall_portid(const struct datapath *dp, uint32_t cpu_id) 1650 { 1651 struct dp_nlsk_pids *dp_nlsk_pids; 1652 1653 dp_nlsk_pids = rcu_dereference(dp->upcall_portids); 1654 1655 if (dp_nlsk_pids) { 1656 if (cpu_id < dp_nlsk_pids->n_pids) { 1657 return dp_nlsk_pids->pids[cpu_id]; 1658 } else if (dp_nlsk_pids->n_pids > 0 && 1659 cpu_id >= dp_nlsk_pids->n_pids) { 1660 /* If the number of netlink PIDs is mismatched with 1661 * the number of CPUs as seen by the kernel, log this 1662 * and send the upcall to an arbitrary socket (0) in 1663 * order to not drop packets 1664 */ 1665 pr_info_ratelimited("cpu_id mismatch with handler threads"); 1666 return dp_nlsk_pids->pids[cpu_id % 1667 dp_nlsk_pids->n_pids]; 1668 } else { 1669 return 0; 1670 } 1671 } else { 1672 return 0; 1673 } 1674 } 1675 1676 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[]) 1677 { 1678 u32 user_features = 0, old_features = dp->user_features; 1679 int err; 1680 1681 if (a[OVS_DP_ATTR_USER_FEATURES]) { 1682 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); 1683 1684 if (user_features & ~(OVS_DP_F_VPORT_PIDS | 1685 OVS_DP_F_UNALIGNED | 1686 OVS_DP_F_TC_RECIRC_SHARING | 1687 OVS_DP_F_DISPATCH_UPCALL_PER_CPU)) 1688 return -EOPNOTSUPP; 1689 1690 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT) 1691 if (user_features & OVS_DP_F_TC_RECIRC_SHARING) 1692 return -EOPNOTSUPP; 1693 #endif 1694 } 1695 1696 if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) { 1697 int err; 1698 u32 cache_size; 1699 1700 cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]); 1701 err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size); 1702 if (err) 1703 return err; 1704 } 1705 1706 dp->user_features = user_features; 1707 1708 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU && 1709 a[OVS_DP_ATTR_PER_CPU_PIDS]) { 1710 /* Upcall Netlink Port IDs have been updated */ 1711 err = ovs_dp_set_upcall_portids(dp, 1712 a[OVS_DP_ATTR_PER_CPU_PIDS]); 1713 if (err) 1714 return err; 1715 } 1716 1717 if ((dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) && 1718 !(old_features & OVS_DP_F_TC_RECIRC_SHARING)) 1719 tc_skb_ext_tc_enable(); 1720 else if (!(dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) && 1721 (old_features & OVS_DP_F_TC_RECIRC_SHARING)) 1722 tc_skb_ext_tc_disable(); 1723 1724 return 0; 1725 } 1726 1727 static int ovs_dp_stats_init(struct datapath *dp) 1728 { 1729 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); 1730 if (!dp->stats_percpu) 1731 return -ENOMEM; 1732 1733 return 0; 1734 } 1735 1736 static int ovs_dp_vport_init(struct datapath *dp) 1737 { 1738 int i; 1739 1740 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS, 1741 sizeof(struct hlist_head), 1742 GFP_KERNEL); 1743 if (!dp->ports) 1744 return -ENOMEM; 1745 1746 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) 1747 INIT_HLIST_HEAD(&dp->ports[i]); 1748 1749 return 0; 1750 } 1751 1752 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) 1753 { 1754 struct nlattr **a = info->attrs; 1755 struct vport_parms parms; 1756 struct sk_buff *reply; 1757 struct datapath *dp; 1758 struct vport *vport; 1759 struct ovs_net *ovs_net; 1760 int err; 1761 1762 err = -EINVAL; 1763 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) 1764 goto err; 1765 1766 reply = ovs_dp_cmd_alloc_info(); 1767 if (!reply) 1768 return -ENOMEM; 1769 1770 err = -ENOMEM; 1771 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1772 if (dp == NULL) 1773 goto err_destroy_reply; 1774 1775 ovs_dp_set_net(dp, sock_net(skb->sk)); 1776 1777 /* Allocate table. */ 1778 err = ovs_flow_tbl_init(&dp->table); 1779 if (err) 1780 goto err_destroy_dp; 1781 1782 err = ovs_dp_stats_init(dp); 1783 if (err) 1784 goto err_destroy_table; 1785 1786 err = ovs_dp_vport_init(dp); 1787 if (err) 1788 goto err_destroy_stats; 1789 1790 err = ovs_meters_init(dp); 1791 if (err) 1792 goto err_destroy_ports; 1793 1794 /* Set up our datapath device. */ 1795 parms.name = nla_data(a[OVS_DP_ATTR_NAME]); 1796 parms.type = OVS_VPORT_TYPE_INTERNAL; 1797 parms.options = NULL; 1798 parms.dp = dp; 1799 parms.port_no = OVSP_LOCAL; 1800 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; 1801 parms.desired_ifindex = a[OVS_DP_ATTR_IFINDEX] 1802 ? nla_get_u32(a[OVS_DP_ATTR_IFINDEX]) : 0; 1803 1804 /* So far only local changes have been made, now need the lock. */ 1805 ovs_lock(); 1806 1807 err = ovs_dp_change(dp, a); 1808 if (err) 1809 goto err_unlock_and_destroy_meters; 1810 1811 vport = new_vport(&parms); 1812 if (IS_ERR(vport)) { 1813 err = PTR_ERR(vport); 1814 if (err == -EBUSY) 1815 err = -EEXIST; 1816 1817 if (err == -EEXIST) { 1818 /* An outdated user space instance that does not understand 1819 * the concept of user_features has attempted to create a new 1820 * datapath and is likely to reuse it. Drop all user features. 1821 */ 1822 if (info->genlhdr->version < OVS_DP_VER_FEATURES) 1823 ovs_dp_reset_user_features(skb, info); 1824 } 1825 1826 goto err_destroy_portids; 1827 } 1828 1829 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1830 info->snd_seq, 0, OVS_DP_CMD_NEW); 1831 BUG_ON(err < 0); 1832 1833 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); 1834 list_add_tail_rcu(&dp->list_node, &ovs_net->dps); 1835 1836 ovs_unlock(); 1837 1838 ovs_notify(&dp_datapath_genl_family, reply, info); 1839 return 0; 1840 1841 err_destroy_portids: 1842 kfree(rcu_dereference_raw(dp->upcall_portids)); 1843 err_unlock_and_destroy_meters: 1844 ovs_unlock(); 1845 ovs_meters_exit(dp); 1846 err_destroy_ports: 1847 kfree(dp->ports); 1848 err_destroy_stats: 1849 free_percpu(dp->stats_percpu); 1850 err_destroy_table: 1851 ovs_flow_tbl_destroy(&dp->table); 1852 err_destroy_dp: 1853 kfree(dp); 1854 err_destroy_reply: 1855 kfree_skb(reply); 1856 err: 1857 return err; 1858 } 1859 1860 /* Called with ovs_mutex. */ 1861 static void __dp_destroy(struct datapath *dp) 1862 { 1863 struct flow_table *table = &dp->table; 1864 int i; 1865 1866 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) 1867 tc_skb_ext_tc_disable(); 1868 1869 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 1870 struct vport *vport; 1871 struct hlist_node *n; 1872 1873 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) 1874 if (vport->port_no != OVSP_LOCAL) 1875 ovs_dp_detach_port(vport); 1876 } 1877 1878 list_del_rcu(&dp->list_node); 1879 1880 /* OVSP_LOCAL is datapath internal port. We need to make sure that 1881 * all ports in datapath are destroyed first before freeing datapath. 1882 */ 1883 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); 1884 1885 /* Flush sw_flow in the tables. RCU cb only releases resource 1886 * such as dp, ports and tables. That may avoid some issues 1887 * such as RCU usage warning. 1888 */ 1889 table_instance_flow_flush(table, ovsl_dereference(table->ti), 1890 ovsl_dereference(table->ufid_ti)); 1891 1892 /* RCU destroy the ports, meters and flow tables. */ 1893 call_rcu(&dp->rcu, destroy_dp_rcu); 1894 } 1895 1896 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) 1897 { 1898 struct sk_buff *reply; 1899 struct datapath *dp; 1900 int err; 1901 1902 reply = ovs_dp_cmd_alloc_info(); 1903 if (!reply) 1904 return -ENOMEM; 1905 1906 ovs_lock(); 1907 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1908 err = PTR_ERR(dp); 1909 if (IS_ERR(dp)) 1910 goto err_unlock_free; 1911 1912 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1913 info->snd_seq, 0, OVS_DP_CMD_DEL); 1914 BUG_ON(err < 0); 1915 1916 __dp_destroy(dp); 1917 ovs_unlock(); 1918 1919 ovs_notify(&dp_datapath_genl_family, reply, info); 1920 1921 return 0; 1922 1923 err_unlock_free: 1924 ovs_unlock(); 1925 kfree_skb(reply); 1926 return err; 1927 } 1928 1929 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) 1930 { 1931 struct sk_buff *reply; 1932 struct datapath *dp; 1933 int err; 1934 1935 reply = ovs_dp_cmd_alloc_info(); 1936 if (!reply) 1937 return -ENOMEM; 1938 1939 ovs_lock(); 1940 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1941 err = PTR_ERR(dp); 1942 if (IS_ERR(dp)) 1943 goto err_unlock_free; 1944 1945 err = ovs_dp_change(dp, info->attrs); 1946 if (err) 1947 goto err_unlock_free; 1948 1949 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, 1950 info->snd_seq, 0, OVS_DP_CMD_SET); 1951 BUG_ON(err < 0); 1952 1953 ovs_unlock(); 1954 ovs_notify(&dp_datapath_genl_family, reply, info); 1955 1956 return 0; 1957 1958 err_unlock_free: 1959 ovs_unlock(); 1960 kfree_skb(reply); 1961 return err; 1962 } 1963 1964 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) 1965 { 1966 struct sk_buff *reply; 1967 struct datapath *dp; 1968 int err; 1969 1970 reply = ovs_dp_cmd_alloc_info(); 1971 if (!reply) 1972 return -ENOMEM; 1973 1974 ovs_lock(); 1975 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); 1976 if (IS_ERR(dp)) { 1977 err = PTR_ERR(dp); 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_GET); 1982 BUG_ON(err < 0); 1983 ovs_unlock(); 1984 1985 return genlmsg_reply(reply, info); 1986 1987 err_unlock_free: 1988 ovs_unlock(); 1989 kfree_skb(reply); 1990 return err; 1991 } 1992 1993 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 1994 { 1995 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1996 struct datapath *dp; 1997 int skip = cb->args[0]; 1998 int i = 0; 1999 2000 ovs_lock(); 2001 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2002 if (i >= skip && 2003 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, 2004 cb->nlh->nlmsg_seq, NLM_F_MULTI, 2005 OVS_DP_CMD_GET) < 0) 2006 break; 2007 i++; 2008 } 2009 ovs_unlock(); 2010 2011 cb->args[0] = i; 2012 2013 return skb->len; 2014 } 2015 2016 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { 2017 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2018 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, 2019 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, 2020 [OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0, 2021 PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)), 2022 [OVS_DP_ATTR_IFINDEX] = {.type = NLA_U32 }, 2023 }; 2024 2025 static const struct genl_small_ops dp_datapath_genl_ops[] = { 2026 { .cmd = OVS_DP_CMD_NEW, 2027 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2028 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2029 .doit = ovs_dp_cmd_new 2030 }, 2031 { .cmd = OVS_DP_CMD_DEL, 2032 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2033 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2034 .doit = ovs_dp_cmd_del 2035 }, 2036 { .cmd = OVS_DP_CMD_GET, 2037 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2038 .flags = 0, /* OK for unprivileged users. */ 2039 .doit = ovs_dp_cmd_get, 2040 .dumpit = ovs_dp_cmd_dump 2041 }, 2042 { .cmd = OVS_DP_CMD_SET, 2043 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2044 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2045 .doit = ovs_dp_cmd_set, 2046 }, 2047 }; 2048 2049 static struct genl_family dp_datapath_genl_family __ro_after_init = { 2050 .hdrsize = sizeof(struct ovs_header), 2051 .name = OVS_DATAPATH_FAMILY, 2052 .version = OVS_DATAPATH_VERSION, 2053 .maxattr = OVS_DP_ATTR_MAX, 2054 .policy = datapath_policy, 2055 .netnsok = true, 2056 .parallel_ops = true, 2057 .small_ops = dp_datapath_genl_ops, 2058 .n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops), 2059 .resv_start_op = OVS_DP_CMD_SET + 1, 2060 .mcgrps = &ovs_dp_datapath_multicast_group, 2061 .n_mcgrps = 1, 2062 .module = THIS_MODULE, 2063 }; 2064 2065 /* Called with ovs_mutex or RCU read lock. */ 2066 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, 2067 struct net *net, u32 portid, u32 seq, 2068 u32 flags, u8 cmd, gfp_t gfp) 2069 { 2070 struct ovs_header *ovs_header; 2071 struct ovs_vport_stats vport_stats; 2072 int err; 2073 2074 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, 2075 flags, cmd); 2076 if (!ovs_header) 2077 return -EMSGSIZE; 2078 2079 ovs_header->dp_ifindex = get_dpifindex(vport->dp); 2080 2081 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || 2082 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || 2083 nla_put_string(skb, OVS_VPORT_ATTR_NAME, 2084 ovs_vport_name(vport)) || 2085 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex)) 2086 goto nla_put_failure; 2087 2088 if (!net_eq(net, dev_net(vport->dev))) { 2089 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp); 2090 2091 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id)) 2092 goto nla_put_failure; 2093 } 2094 2095 ovs_vport_get_stats(vport, &vport_stats); 2096 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS, 2097 sizeof(struct ovs_vport_stats), &vport_stats, 2098 OVS_VPORT_ATTR_PAD)) 2099 goto nla_put_failure; 2100 2101 if (ovs_vport_get_upcall_portids(vport, skb)) 2102 goto nla_put_failure; 2103 2104 err = ovs_vport_get_options(vport, skb); 2105 if (err == -EMSGSIZE) 2106 goto error; 2107 2108 genlmsg_end(skb, ovs_header); 2109 return 0; 2110 2111 nla_put_failure: 2112 err = -EMSGSIZE; 2113 error: 2114 genlmsg_cancel(skb, ovs_header); 2115 return err; 2116 } 2117 2118 static struct sk_buff *ovs_vport_cmd_alloc_info(void) 2119 { 2120 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2121 } 2122 2123 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ 2124 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net, 2125 u32 portid, u32 seq, u8 cmd) 2126 { 2127 struct sk_buff *skb; 2128 int retval; 2129 2130 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2131 if (!skb) 2132 return ERR_PTR(-ENOMEM); 2133 2134 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd, 2135 GFP_KERNEL); 2136 BUG_ON(retval < 0); 2137 2138 return skb; 2139 } 2140 2141 /* Called with ovs_mutex or RCU read lock. */ 2142 static struct vport *lookup_vport(struct net *net, 2143 const struct ovs_header *ovs_header, 2144 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) 2145 { 2146 struct datapath *dp; 2147 struct vport *vport; 2148 2149 if (a[OVS_VPORT_ATTR_IFINDEX]) 2150 return ERR_PTR(-EOPNOTSUPP); 2151 if (a[OVS_VPORT_ATTR_NAME]) { 2152 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); 2153 if (!vport) 2154 return ERR_PTR(-ENODEV); 2155 if (ovs_header->dp_ifindex && 2156 ovs_header->dp_ifindex != get_dpifindex(vport->dp)) 2157 return ERR_PTR(-ENODEV); 2158 return vport; 2159 } else if (a[OVS_VPORT_ATTR_PORT_NO]) { 2160 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); 2161 2162 if (port_no >= DP_MAX_PORTS) 2163 return ERR_PTR(-EFBIG); 2164 2165 dp = get_dp(net, ovs_header->dp_ifindex); 2166 if (!dp) 2167 return ERR_PTR(-ENODEV); 2168 2169 vport = ovs_vport_ovsl_rcu(dp, port_no); 2170 if (!vport) 2171 return ERR_PTR(-ENODEV); 2172 return vport; 2173 } else 2174 return ERR_PTR(-EINVAL); 2175 2176 } 2177 2178 static unsigned int ovs_get_max_headroom(struct datapath *dp) 2179 { 2180 unsigned int dev_headroom, max_headroom = 0; 2181 struct net_device *dev; 2182 struct vport *vport; 2183 int i; 2184 2185 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2186 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, 2187 lockdep_ovsl_is_held()) { 2188 dev = vport->dev; 2189 dev_headroom = netdev_get_fwd_headroom(dev); 2190 if (dev_headroom > max_headroom) 2191 max_headroom = dev_headroom; 2192 } 2193 } 2194 2195 return max_headroom; 2196 } 2197 2198 /* Called with ovs_mutex */ 2199 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom) 2200 { 2201 struct vport *vport; 2202 int i; 2203 2204 dp->max_headroom = new_headroom; 2205 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2206 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, 2207 lockdep_ovsl_is_held()) 2208 netdev_set_rx_headroom(vport->dev, new_headroom); 2209 } 2210 } 2211 2212 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) 2213 { 2214 struct nlattr **a = info->attrs; 2215 struct ovs_header *ovs_header = info->userhdr; 2216 struct vport_parms parms; 2217 struct sk_buff *reply; 2218 struct vport *vport; 2219 struct datapath *dp; 2220 unsigned int new_headroom; 2221 u32 port_no; 2222 int err; 2223 2224 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || 2225 !a[OVS_VPORT_ATTR_UPCALL_PID]) 2226 return -EINVAL; 2227 2228 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); 2229 2230 if (a[OVS_VPORT_ATTR_IFINDEX] && parms.type != OVS_VPORT_TYPE_INTERNAL) 2231 return -EOPNOTSUPP; 2232 2233 port_no = a[OVS_VPORT_ATTR_PORT_NO] 2234 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; 2235 if (port_no >= DP_MAX_PORTS) 2236 return -EFBIG; 2237 2238 reply = ovs_vport_cmd_alloc_info(); 2239 if (!reply) 2240 return -ENOMEM; 2241 2242 ovs_lock(); 2243 restart: 2244 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); 2245 err = -ENODEV; 2246 if (!dp) 2247 goto exit_unlock_free; 2248 2249 if (port_no) { 2250 vport = ovs_vport_ovsl(dp, port_no); 2251 err = -EBUSY; 2252 if (vport) 2253 goto exit_unlock_free; 2254 } else { 2255 for (port_no = 1; ; port_no++) { 2256 if (port_no >= DP_MAX_PORTS) { 2257 err = -EFBIG; 2258 goto exit_unlock_free; 2259 } 2260 vport = ovs_vport_ovsl(dp, port_no); 2261 if (!vport) 2262 break; 2263 } 2264 } 2265 2266 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); 2267 parms.options = a[OVS_VPORT_ATTR_OPTIONS]; 2268 parms.dp = dp; 2269 parms.port_no = port_no; 2270 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2271 parms.desired_ifindex = a[OVS_VPORT_ATTR_IFINDEX] 2272 ? nla_get_u32(a[OVS_VPORT_ATTR_IFINDEX]) : 0; 2273 2274 vport = new_vport(&parms); 2275 err = PTR_ERR(vport); 2276 if (IS_ERR(vport)) { 2277 if (err == -EAGAIN) 2278 goto restart; 2279 goto exit_unlock_free; 2280 } 2281 2282 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2283 info->snd_portid, info->snd_seq, 0, 2284 OVS_VPORT_CMD_NEW, GFP_KERNEL); 2285 2286 new_headroom = netdev_get_fwd_headroom(vport->dev); 2287 2288 if (new_headroom > dp->max_headroom) 2289 ovs_update_headroom(dp, new_headroom); 2290 else 2291 netdev_set_rx_headroom(vport->dev, dp->max_headroom); 2292 2293 BUG_ON(err < 0); 2294 ovs_unlock(); 2295 2296 ovs_notify(&dp_vport_genl_family, reply, info); 2297 return 0; 2298 2299 exit_unlock_free: 2300 ovs_unlock(); 2301 kfree_skb(reply); 2302 return err; 2303 } 2304 2305 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) 2306 { 2307 struct nlattr **a = info->attrs; 2308 struct sk_buff *reply; 2309 struct vport *vport; 2310 int err; 2311 2312 reply = ovs_vport_cmd_alloc_info(); 2313 if (!reply) 2314 return -ENOMEM; 2315 2316 ovs_lock(); 2317 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2318 err = PTR_ERR(vport); 2319 if (IS_ERR(vport)) 2320 goto exit_unlock_free; 2321 2322 if (a[OVS_VPORT_ATTR_TYPE] && 2323 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { 2324 err = -EINVAL; 2325 goto exit_unlock_free; 2326 } 2327 2328 if (a[OVS_VPORT_ATTR_OPTIONS]) { 2329 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); 2330 if (err) 2331 goto exit_unlock_free; 2332 } 2333 2334 2335 if (a[OVS_VPORT_ATTR_UPCALL_PID]) { 2336 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; 2337 2338 err = ovs_vport_set_upcall_portids(vport, ids); 2339 if (err) 2340 goto exit_unlock_free; 2341 } 2342 2343 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2344 info->snd_portid, info->snd_seq, 0, 2345 OVS_VPORT_CMD_SET, GFP_KERNEL); 2346 BUG_ON(err < 0); 2347 2348 ovs_unlock(); 2349 ovs_notify(&dp_vport_genl_family, reply, info); 2350 return 0; 2351 2352 exit_unlock_free: 2353 ovs_unlock(); 2354 kfree_skb(reply); 2355 return err; 2356 } 2357 2358 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) 2359 { 2360 bool update_headroom = false; 2361 struct nlattr **a = info->attrs; 2362 struct sk_buff *reply; 2363 struct datapath *dp; 2364 struct vport *vport; 2365 unsigned int new_headroom; 2366 int err; 2367 2368 reply = ovs_vport_cmd_alloc_info(); 2369 if (!reply) 2370 return -ENOMEM; 2371 2372 ovs_lock(); 2373 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); 2374 err = PTR_ERR(vport); 2375 if (IS_ERR(vport)) 2376 goto exit_unlock_free; 2377 2378 if (vport->port_no == OVSP_LOCAL) { 2379 err = -EINVAL; 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_DEL, GFP_KERNEL); 2386 BUG_ON(err < 0); 2387 2388 /* the vport deletion may trigger dp headroom update */ 2389 dp = vport->dp; 2390 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom) 2391 update_headroom = true; 2392 2393 netdev_reset_rx_headroom(vport->dev); 2394 ovs_dp_detach_port(vport); 2395 2396 if (update_headroom) { 2397 new_headroom = ovs_get_max_headroom(dp); 2398 2399 if (new_headroom < dp->max_headroom) 2400 ovs_update_headroom(dp, new_headroom); 2401 } 2402 ovs_unlock(); 2403 2404 ovs_notify(&dp_vport_genl_family, reply, info); 2405 return 0; 2406 2407 exit_unlock_free: 2408 ovs_unlock(); 2409 kfree_skb(reply); 2410 return err; 2411 } 2412 2413 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) 2414 { 2415 struct nlattr **a = info->attrs; 2416 struct ovs_header *ovs_header = info->userhdr; 2417 struct sk_buff *reply; 2418 struct vport *vport; 2419 int err; 2420 2421 reply = ovs_vport_cmd_alloc_info(); 2422 if (!reply) 2423 return -ENOMEM; 2424 2425 rcu_read_lock(); 2426 vport = lookup_vport(sock_net(skb->sk), ovs_header, a); 2427 err = PTR_ERR(vport); 2428 if (IS_ERR(vport)) 2429 goto exit_unlock_free; 2430 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), 2431 info->snd_portid, info->snd_seq, 0, 2432 OVS_VPORT_CMD_GET, GFP_ATOMIC); 2433 BUG_ON(err < 0); 2434 rcu_read_unlock(); 2435 2436 return genlmsg_reply(reply, info); 2437 2438 exit_unlock_free: 2439 rcu_read_unlock(); 2440 kfree_skb(reply); 2441 return err; 2442 } 2443 2444 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) 2445 { 2446 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); 2447 struct datapath *dp; 2448 int bucket = cb->args[0], skip = cb->args[1]; 2449 int i, j = 0; 2450 2451 rcu_read_lock(); 2452 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); 2453 if (!dp) { 2454 rcu_read_unlock(); 2455 return -ENODEV; 2456 } 2457 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { 2458 struct vport *vport; 2459 2460 j = 0; 2461 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { 2462 if (j >= skip && 2463 ovs_vport_cmd_fill_info(vport, skb, 2464 sock_net(skb->sk), 2465 NETLINK_CB(cb->skb).portid, 2466 cb->nlh->nlmsg_seq, 2467 NLM_F_MULTI, 2468 OVS_VPORT_CMD_GET, 2469 GFP_ATOMIC) < 0) 2470 goto out; 2471 2472 j++; 2473 } 2474 skip = 0; 2475 } 2476 out: 2477 rcu_read_unlock(); 2478 2479 cb->args[0] = i; 2480 cb->args[1] = j; 2481 2482 return skb->len; 2483 } 2484 2485 static void ovs_dp_masks_rebalance(struct work_struct *work) 2486 { 2487 struct ovs_net *ovs_net = container_of(work, struct ovs_net, 2488 masks_rebalance.work); 2489 struct datapath *dp; 2490 2491 ovs_lock(); 2492 2493 list_for_each_entry(dp, &ovs_net->dps, list_node) 2494 ovs_flow_masks_rebalance(&dp->table); 2495 2496 ovs_unlock(); 2497 2498 schedule_delayed_work(&ovs_net->masks_rebalance, 2499 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL)); 2500 } 2501 2502 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { 2503 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 2504 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, 2505 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, 2506 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, 2507 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC }, 2508 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, 2509 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 }, 2510 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 }, 2511 }; 2512 2513 static const struct genl_small_ops dp_vport_genl_ops[] = { 2514 { .cmd = OVS_VPORT_CMD_NEW, 2515 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2516 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2517 .doit = ovs_vport_cmd_new 2518 }, 2519 { .cmd = OVS_VPORT_CMD_DEL, 2520 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2521 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2522 .doit = ovs_vport_cmd_del 2523 }, 2524 { .cmd = OVS_VPORT_CMD_GET, 2525 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2526 .flags = 0, /* OK for unprivileged users. */ 2527 .doit = ovs_vport_cmd_get, 2528 .dumpit = ovs_vport_cmd_dump 2529 }, 2530 { .cmd = OVS_VPORT_CMD_SET, 2531 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2532 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ 2533 .doit = ovs_vport_cmd_set, 2534 }, 2535 }; 2536 2537 struct genl_family dp_vport_genl_family __ro_after_init = { 2538 .hdrsize = sizeof(struct ovs_header), 2539 .name = OVS_VPORT_FAMILY, 2540 .version = OVS_VPORT_VERSION, 2541 .maxattr = OVS_VPORT_ATTR_MAX, 2542 .policy = vport_policy, 2543 .netnsok = true, 2544 .parallel_ops = true, 2545 .small_ops = dp_vport_genl_ops, 2546 .n_small_ops = ARRAY_SIZE(dp_vport_genl_ops), 2547 .resv_start_op = OVS_VPORT_CMD_SET + 1, 2548 .mcgrps = &ovs_dp_vport_multicast_group, 2549 .n_mcgrps = 1, 2550 .module = THIS_MODULE, 2551 }; 2552 2553 static struct genl_family * const dp_genl_families[] = { 2554 &dp_datapath_genl_family, 2555 &dp_vport_genl_family, 2556 &dp_flow_genl_family, 2557 &dp_packet_genl_family, 2558 &dp_meter_genl_family, 2559 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 2560 &dp_ct_limit_genl_family, 2561 #endif 2562 }; 2563 2564 static void dp_unregister_genl(int n_families) 2565 { 2566 int i; 2567 2568 for (i = 0; i < n_families; i++) 2569 genl_unregister_family(dp_genl_families[i]); 2570 } 2571 2572 static int __init dp_register_genl(void) 2573 { 2574 int err; 2575 int i; 2576 2577 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { 2578 2579 err = genl_register_family(dp_genl_families[i]); 2580 if (err) 2581 goto error; 2582 } 2583 2584 return 0; 2585 2586 error: 2587 dp_unregister_genl(i); 2588 return err; 2589 } 2590 2591 static int __net_init ovs_init_net(struct net *net) 2592 { 2593 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2594 int err; 2595 2596 INIT_LIST_HEAD(&ovs_net->dps); 2597 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); 2598 INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance); 2599 2600 err = ovs_ct_init(net); 2601 if (err) 2602 return err; 2603 2604 schedule_delayed_work(&ovs_net->masks_rebalance, 2605 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL)); 2606 return 0; 2607 } 2608 2609 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, 2610 struct list_head *head) 2611 { 2612 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2613 struct datapath *dp; 2614 2615 list_for_each_entry(dp, &ovs_net->dps, list_node) { 2616 int i; 2617 2618 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { 2619 struct vport *vport; 2620 2621 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { 2622 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) 2623 continue; 2624 2625 if (dev_net(vport->dev) == dnet) 2626 list_add(&vport->detach_list, head); 2627 } 2628 } 2629 } 2630 } 2631 2632 static void __net_exit ovs_exit_net(struct net *dnet) 2633 { 2634 struct datapath *dp, *dp_next; 2635 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); 2636 struct vport *vport, *vport_next; 2637 struct net *net; 2638 LIST_HEAD(head); 2639 2640 ovs_lock(); 2641 2642 ovs_ct_exit(dnet); 2643 2644 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) 2645 __dp_destroy(dp); 2646 2647 down_read(&net_rwsem); 2648 for_each_net(net) 2649 list_vports_from_net(net, dnet, &head); 2650 up_read(&net_rwsem); 2651 2652 /* Detach all vports from given namespace. */ 2653 list_for_each_entry_safe(vport, vport_next, &head, detach_list) { 2654 list_del(&vport->detach_list); 2655 ovs_dp_detach_port(vport); 2656 } 2657 2658 ovs_unlock(); 2659 2660 cancel_delayed_work_sync(&ovs_net->masks_rebalance); 2661 cancel_work_sync(&ovs_net->dp_notify_work); 2662 } 2663 2664 static struct pernet_operations ovs_net_ops = { 2665 .init = ovs_init_net, 2666 .exit = ovs_exit_net, 2667 .id = &ovs_net_id, 2668 .size = sizeof(struct ovs_net), 2669 }; 2670 2671 static int __init dp_init(void) 2672 { 2673 int err; 2674 2675 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > 2676 sizeof_field(struct sk_buff, cb)); 2677 2678 pr_info("Open vSwitch switching datapath\n"); 2679 2680 err = action_fifos_init(); 2681 if (err) 2682 goto error; 2683 2684 err = ovs_internal_dev_rtnl_link_register(); 2685 if (err) 2686 goto error_action_fifos_exit; 2687 2688 err = ovs_flow_init(); 2689 if (err) 2690 goto error_unreg_rtnl_link; 2691 2692 err = ovs_vport_init(); 2693 if (err) 2694 goto error_flow_exit; 2695 2696 err = register_pernet_device(&ovs_net_ops); 2697 if (err) 2698 goto error_vport_exit; 2699 2700 err = register_netdevice_notifier(&ovs_dp_device_notifier); 2701 if (err) 2702 goto error_netns_exit; 2703 2704 err = ovs_netdev_init(); 2705 if (err) 2706 goto error_unreg_notifier; 2707 2708 err = dp_register_genl(); 2709 if (err < 0) 2710 goto error_unreg_netdev; 2711 2712 return 0; 2713 2714 error_unreg_netdev: 2715 ovs_netdev_exit(); 2716 error_unreg_notifier: 2717 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2718 error_netns_exit: 2719 unregister_pernet_device(&ovs_net_ops); 2720 error_vport_exit: 2721 ovs_vport_exit(); 2722 error_flow_exit: 2723 ovs_flow_exit(); 2724 error_unreg_rtnl_link: 2725 ovs_internal_dev_rtnl_link_unregister(); 2726 error_action_fifos_exit: 2727 action_fifos_exit(); 2728 error: 2729 return err; 2730 } 2731 2732 static void dp_cleanup(void) 2733 { 2734 dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); 2735 ovs_netdev_exit(); 2736 unregister_netdevice_notifier(&ovs_dp_device_notifier); 2737 unregister_pernet_device(&ovs_net_ops); 2738 rcu_barrier(); 2739 ovs_vport_exit(); 2740 ovs_flow_exit(); 2741 ovs_internal_dev_rtnl_link_unregister(); 2742 action_fifos_exit(); 2743 } 2744 2745 module_init(dp_init); 2746 module_exit(dp_cleanup); 2747 2748 MODULE_DESCRIPTION("Open vSwitch switching datapath"); 2749 MODULE_LICENSE("GPL"); 2750 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY); 2751 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY); 2752 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY); 2753 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY); 2754 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY); 2755 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY); 2756