1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * This is a module which is used for queueing packets and communicating with 4 * userspace via nfnetlink. 5 * 6 * (C) 2005 by Harald Welte <laforge@netfilter.org> 7 * (C) 2007 by Patrick McHardy <kaber@trash.net> 8 * 9 * Based on the old ipv4-only ip_queue.c: 10 * (C) 2000-2002 James Morris <jmorris@intercode.com.au> 11 * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org> 12 */ 13 14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 15 16 #include <linux/module.h> 17 #include <linux/skbuff.h> 18 #include <linux/init.h> 19 #include <linux/spinlock.h> 20 #include <linux/slab.h> 21 #include <linux/notifier.h> 22 #include <linux/netdevice.h> 23 #include <linux/netfilter.h> 24 #include <linux/proc_fs.h> 25 #include <linux/netfilter_ipv4.h> 26 #include <linux/netfilter_ipv6.h> 27 #include <linux/netfilter_bridge.h> 28 #include <linux/netfilter/nfnetlink.h> 29 #include <linux/netfilter/nfnetlink_queue.h> 30 #include <linux/netfilter/nf_conntrack_common.h> 31 #include <linux/list.h> 32 #include <net/sock.h> 33 #include <net/tcp_states.h> 34 #include <net/netfilter/nf_queue.h> 35 #include <net/netns/generic.h> 36 37 #include <linux/atomic.h> 38 39 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 40 #include "../bridge/br_private.h" 41 #endif 42 43 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 44 #include <net/netfilter/nf_conntrack.h> 45 #endif 46 47 #define NFQNL_QMAX_DEFAULT 1024 48 49 /* We're using struct nlattr which has 16bit nla_len. Note that nla_len 50 * includes the header length. Thus, the maximum packet length that we 51 * support is 65531 bytes. We send truncated packets if the specified length 52 * is larger than that. Userspace can check for presence of NFQA_CAP_LEN 53 * attribute to detect truncation. 54 */ 55 #define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN) 56 57 struct nfqnl_instance { 58 struct hlist_node hlist; /* global list of queues */ 59 struct rcu_head rcu; 60 61 u32 peer_portid; 62 unsigned int queue_maxlen; 63 unsigned int copy_range; 64 unsigned int queue_dropped; 65 unsigned int queue_user_dropped; 66 67 68 u_int16_t queue_num; /* number of this queue */ 69 u_int8_t copy_mode; 70 u_int32_t flags; /* Set using NFQA_CFG_FLAGS */ 71 /* 72 * Following fields are dirtied for each queued packet, 73 * keep them in same cache line if possible. 74 */ 75 spinlock_t lock ____cacheline_aligned_in_smp; 76 unsigned int queue_total; 77 unsigned int id_sequence; /* 'sequence' of pkt ids */ 78 struct list_head queue_list; /* packets in queue */ 79 }; 80 81 typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long); 82 83 static unsigned int nfnl_queue_net_id __read_mostly; 84 85 #define INSTANCE_BUCKETS 16 86 struct nfnl_queue_net { 87 spinlock_t instances_lock; 88 struct hlist_head instance_table[INSTANCE_BUCKETS]; 89 }; 90 91 static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net) 92 { 93 return net_generic(net, nfnl_queue_net_id); 94 } 95 96 static inline u_int8_t instance_hashfn(u_int16_t queue_num) 97 { 98 return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS; 99 } 100 101 static struct nfqnl_instance * 102 instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num) 103 { 104 struct hlist_head *head; 105 struct nfqnl_instance *inst; 106 107 head = &q->instance_table[instance_hashfn(queue_num)]; 108 hlist_for_each_entry_rcu(inst, head, hlist) { 109 if (inst->queue_num == queue_num) 110 return inst; 111 } 112 return NULL; 113 } 114 115 static struct nfqnl_instance * 116 instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, u32 portid) 117 { 118 struct nfqnl_instance *inst; 119 unsigned int h; 120 int err; 121 122 spin_lock(&q->instances_lock); 123 if (instance_lookup(q, queue_num)) { 124 err = -EEXIST; 125 goto out_unlock; 126 } 127 128 inst = kzalloc(sizeof(*inst), GFP_ATOMIC); 129 if (!inst) { 130 err = -ENOMEM; 131 goto out_unlock; 132 } 133 134 inst->queue_num = queue_num; 135 inst->peer_portid = portid; 136 inst->queue_maxlen = NFQNL_QMAX_DEFAULT; 137 inst->copy_range = NFQNL_MAX_COPY_RANGE; 138 inst->copy_mode = NFQNL_COPY_NONE; 139 spin_lock_init(&inst->lock); 140 INIT_LIST_HEAD(&inst->queue_list); 141 142 if (!try_module_get(THIS_MODULE)) { 143 err = -EAGAIN; 144 goto out_free; 145 } 146 147 h = instance_hashfn(queue_num); 148 hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]); 149 150 spin_unlock(&q->instances_lock); 151 152 return inst; 153 154 out_free: 155 kfree(inst); 156 out_unlock: 157 spin_unlock(&q->instances_lock); 158 return ERR_PTR(err); 159 } 160 161 static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, 162 unsigned long data); 163 164 static void 165 instance_destroy_rcu(struct rcu_head *head) 166 { 167 struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance, 168 rcu); 169 170 nfqnl_flush(inst, NULL, 0); 171 kfree(inst); 172 module_put(THIS_MODULE); 173 } 174 175 static void 176 __instance_destroy(struct nfqnl_instance *inst) 177 { 178 hlist_del_rcu(&inst->hlist); 179 call_rcu(&inst->rcu, instance_destroy_rcu); 180 } 181 182 static void 183 instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst) 184 { 185 spin_lock(&q->instances_lock); 186 __instance_destroy(inst); 187 spin_unlock(&q->instances_lock); 188 } 189 190 static inline void 191 __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) 192 { 193 list_add_tail(&entry->list, &queue->queue_list); 194 queue->queue_total++; 195 } 196 197 static void 198 __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) 199 { 200 list_del(&entry->list); 201 queue->queue_total--; 202 } 203 204 static struct nf_queue_entry * 205 find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id) 206 { 207 struct nf_queue_entry *entry = NULL, *i; 208 209 spin_lock_bh(&queue->lock); 210 211 list_for_each_entry(i, &queue->queue_list, list) { 212 if (i->id == id) { 213 entry = i; 214 break; 215 } 216 } 217 218 if (entry) 219 __dequeue_entry(queue, entry); 220 221 spin_unlock_bh(&queue->lock); 222 223 return entry; 224 } 225 226 static void nfqnl_reinject(struct nf_queue_entry *entry, unsigned int verdict) 227 { 228 const struct nf_ct_hook *ct_hook; 229 int err; 230 231 if (verdict == NF_ACCEPT || 232 verdict == NF_REPEAT || 233 verdict == NF_STOP) { 234 rcu_read_lock(); 235 ct_hook = rcu_dereference(nf_ct_hook); 236 if (ct_hook) { 237 err = ct_hook->update(entry->state.net, entry->skb); 238 if (err < 0) 239 verdict = NF_DROP; 240 } 241 rcu_read_unlock(); 242 } 243 nf_reinject(entry, verdict); 244 } 245 246 static void 247 nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) 248 { 249 struct nf_queue_entry *entry, *next; 250 251 spin_lock_bh(&queue->lock); 252 list_for_each_entry_safe(entry, next, &queue->queue_list, list) { 253 if (!cmpfn || cmpfn(entry, data)) { 254 list_del(&entry->list); 255 queue->queue_total--; 256 nfqnl_reinject(entry, NF_DROP); 257 } 258 } 259 spin_unlock_bh(&queue->lock); 260 } 261 262 static int 263 nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet, 264 bool csum_verify) 265 { 266 __u32 flags = 0; 267 268 if (packet->ip_summed == CHECKSUM_PARTIAL) 269 flags = NFQA_SKB_CSUMNOTREADY; 270 else if (csum_verify) 271 flags = NFQA_SKB_CSUM_NOTVERIFIED; 272 273 if (skb_is_gso(packet)) 274 flags |= NFQA_SKB_GSO; 275 276 return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0; 277 } 278 279 static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk) 280 { 281 const struct cred *cred; 282 283 if (!sk_fullsock(sk)) 284 return 0; 285 286 read_lock_bh(&sk->sk_callback_lock); 287 if (sk->sk_socket && sk->sk_socket->file) { 288 cred = sk->sk_socket->file->f_cred; 289 if (nla_put_be32(skb, NFQA_UID, 290 htonl(from_kuid_munged(&init_user_ns, cred->fsuid)))) 291 goto nla_put_failure; 292 if (nla_put_be32(skb, NFQA_GID, 293 htonl(from_kgid_munged(&init_user_ns, cred->fsgid)))) 294 goto nla_put_failure; 295 } 296 read_unlock_bh(&sk->sk_callback_lock); 297 return 0; 298 299 nla_put_failure: 300 read_unlock_bh(&sk->sk_callback_lock); 301 return -1; 302 } 303 304 static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata) 305 { 306 u32 seclen = 0; 307 #if IS_ENABLED(CONFIG_NETWORK_SECMARK) 308 if (!skb || !sk_fullsock(skb->sk)) 309 return 0; 310 311 read_lock_bh(&skb->sk->sk_callback_lock); 312 313 if (skb->secmark) 314 security_secid_to_secctx(skb->secmark, secdata, &seclen); 315 316 read_unlock_bh(&skb->sk->sk_callback_lock); 317 #endif 318 return seclen; 319 } 320 321 static u32 nfqnl_get_bridge_size(struct nf_queue_entry *entry) 322 { 323 struct sk_buff *entskb = entry->skb; 324 u32 nlalen = 0; 325 326 if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb)) 327 return 0; 328 329 if (skb_vlan_tag_present(entskb)) 330 nlalen += nla_total_size(nla_total_size(sizeof(__be16)) + 331 nla_total_size(sizeof(__be16))); 332 333 if (entskb->network_header > entskb->mac_header) 334 nlalen += nla_total_size((entskb->network_header - 335 entskb->mac_header)); 336 337 return nlalen; 338 } 339 340 static int nfqnl_put_bridge(struct nf_queue_entry *entry, struct sk_buff *skb) 341 { 342 struct sk_buff *entskb = entry->skb; 343 344 if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb)) 345 return 0; 346 347 if (skb_vlan_tag_present(entskb)) { 348 struct nlattr *nest; 349 350 nest = nla_nest_start(skb, NFQA_VLAN); 351 if (!nest) 352 goto nla_put_failure; 353 354 if (nla_put_be16(skb, NFQA_VLAN_TCI, htons(entskb->vlan_tci)) || 355 nla_put_be16(skb, NFQA_VLAN_PROTO, entskb->vlan_proto)) 356 goto nla_put_failure; 357 358 nla_nest_end(skb, nest); 359 } 360 361 if (entskb->mac_header < entskb->network_header) { 362 int len = (int)(entskb->network_header - entskb->mac_header); 363 364 if (nla_put(skb, NFQA_L2HDR, len, skb_mac_header(entskb))) 365 goto nla_put_failure; 366 } 367 368 return 0; 369 370 nla_put_failure: 371 return -1; 372 } 373 374 static struct sk_buff * 375 nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, 376 struct nf_queue_entry *entry, 377 __be32 **packet_id_ptr) 378 { 379 size_t size; 380 size_t data_len = 0, cap_len = 0; 381 unsigned int hlen = 0; 382 struct sk_buff *skb; 383 struct nlattr *nla; 384 struct nfqnl_msg_packet_hdr *pmsg; 385 struct nlmsghdr *nlh; 386 struct sk_buff *entskb = entry->skb; 387 struct net_device *indev; 388 struct net_device *outdev; 389 struct nf_conn *ct = NULL; 390 enum ip_conntrack_info ctinfo = 0; 391 const struct nfnl_ct_hook *nfnl_ct; 392 bool csum_verify; 393 char *secdata = NULL; 394 u32 seclen = 0; 395 396 size = nlmsg_total_size(sizeof(struct nfgenmsg)) 397 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) 398 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 399 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 400 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 401 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 402 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 403 #endif 404 + nla_total_size(sizeof(u_int32_t)) /* mark */ 405 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) 406 + nla_total_size(sizeof(u_int32_t)) /* skbinfo */ 407 + nla_total_size(sizeof(u_int32_t)); /* cap_len */ 408 409 if (entskb->tstamp) 410 size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); 411 412 size += nfqnl_get_bridge_size(entry); 413 414 if (entry->state.hook <= NF_INET_FORWARD || 415 (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL)) 416 csum_verify = !skb_csum_unnecessary(entskb); 417 else 418 csum_verify = false; 419 420 outdev = entry->state.out; 421 422 switch ((enum nfqnl_config_mode)READ_ONCE(queue->copy_mode)) { 423 case NFQNL_COPY_META: 424 case NFQNL_COPY_NONE: 425 break; 426 427 case NFQNL_COPY_PACKET: 428 if (!(queue->flags & NFQA_CFG_F_GSO) && 429 entskb->ip_summed == CHECKSUM_PARTIAL && 430 skb_checksum_help(entskb)) 431 return NULL; 432 433 data_len = READ_ONCE(queue->copy_range); 434 if (data_len > entskb->len) 435 data_len = entskb->len; 436 437 hlen = skb_zerocopy_headlen(entskb); 438 hlen = min_t(unsigned int, hlen, data_len); 439 size += sizeof(struct nlattr) + hlen; 440 cap_len = entskb->len; 441 break; 442 } 443 444 nfnl_ct = rcu_dereference(nfnl_ct_hook); 445 446 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 447 if (queue->flags & NFQA_CFG_F_CONNTRACK) { 448 if (nfnl_ct != NULL) { 449 ct = nf_ct_get(entskb, &ctinfo); 450 if (ct != NULL) 451 size += nfnl_ct->build_size(ct); 452 } 453 } 454 #endif 455 456 if (queue->flags & NFQA_CFG_F_UID_GID) { 457 size += (nla_total_size(sizeof(u_int32_t)) /* uid */ 458 + nla_total_size(sizeof(u_int32_t))); /* gid */ 459 } 460 461 if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) { 462 seclen = nfqnl_get_sk_secctx(entskb, &secdata); 463 if (seclen) 464 size += nla_total_size(seclen); 465 } 466 467 skb = alloc_skb(size, GFP_ATOMIC); 468 if (!skb) { 469 skb_tx_error(entskb); 470 goto nlmsg_failure; 471 } 472 473 nlh = nfnl_msg_put(skb, 0, 0, 474 nfnl_msg_type(NFNL_SUBSYS_QUEUE, NFQNL_MSG_PACKET), 475 0, entry->state.pf, NFNETLINK_V0, 476 htons(queue->queue_num)); 477 if (!nlh) { 478 skb_tx_error(entskb); 479 kfree_skb(skb); 480 goto nlmsg_failure; 481 } 482 483 nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); 484 pmsg = nla_data(nla); 485 pmsg->hw_protocol = entskb->protocol; 486 pmsg->hook = entry->state.hook; 487 *packet_id_ptr = &pmsg->packet_id; 488 489 indev = entry->state.in; 490 if (indev) { 491 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 492 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) 493 goto nla_put_failure; 494 #else 495 if (entry->state.pf == PF_BRIDGE) { 496 /* Case 1: indev is physical input device, we need to 497 * look for bridge group (when called from 498 * netfilter_bridge) */ 499 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, 500 htonl(indev->ifindex)) || 501 /* this is the bridge group "brX" */ 502 /* rcu_read_lock()ed by __nf_queue */ 503 nla_put_be32(skb, NFQA_IFINDEX_INDEV, 504 htonl(br_port_get_rcu(indev)->br->dev->ifindex))) 505 goto nla_put_failure; 506 } else { 507 int physinif; 508 509 /* Case 2: indev is bridge group, we need to look for 510 * physical device (when called from ipv4) */ 511 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, 512 htonl(indev->ifindex))) 513 goto nla_put_failure; 514 515 physinif = nf_bridge_get_physinif(entskb); 516 if (physinif && 517 nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, 518 htonl(physinif))) 519 goto nla_put_failure; 520 } 521 #endif 522 } 523 524 if (outdev) { 525 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 526 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) 527 goto nla_put_failure; 528 #else 529 if (entry->state.pf == PF_BRIDGE) { 530 /* Case 1: outdev is physical output device, we need to 531 * look for bridge group (when called from 532 * netfilter_bridge) */ 533 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, 534 htonl(outdev->ifindex)) || 535 /* this is the bridge group "brX" */ 536 /* rcu_read_lock()ed by __nf_queue */ 537 nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, 538 htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) 539 goto nla_put_failure; 540 } else { 541 int physoutif; 542 543 /* Case 2: outdev is bridge group, we need to look for 544 * physical output device (when called from ipv4) */ 545 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, 546 htonl(outdev->ifindex))) 547 goto nla_put_failure; 548 549 physoutif = nf_bridge_get_physoutif(entskb); 550 if (physoutif && 551 nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, 552 htonl(physoutif))) 553 goto nla_put_failure; 554 } 555 #endif 556 } 557 558 if (entskb->mark && 559 nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) 560 goto nla_put_failure; 561 562 if (indev && entskb->dev && 563 skb_mac_header_was_set(entskb) && 564 skb_mac_header_len(entskb) != 0) { 565 struct nfqnl_msg_packet_hw phw; 566 int len; 567 568 memset(&phw, 0, sizeof(phw)); 569 len = dev_parse_header(entskb, phw.hw_addr); 570 if (len) { 571 phw.hw_addrlen = htons(len); 572 if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) 573 goto nla_put_failure; 574 } 575 } 576 577 if (nfqnl_put_bridge(entry, skb) < 0) 578 goto nla_put_failure; 579 580 if (entry->state.hook <= NF_INET_FORWARD && entskb->tstamp) { 581 struct nfqnl_msg_packet_timestamp ts; 582 struct timespec64 kts = ktime_to_timespec64(entskb->tstamp); 583 584 ts.sec = cpu_to_be64(kts.tv_sec); 585 ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC); 586 587 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) 588 goto nla_put_failure; 589 } 590 591 if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk && 592 nfqnl_put_sk_uidgid(skb, entskb->sk) < 0) 593 goto nla_put_failure; 594 595 if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata)) 596 goto nla_put_failure; 597 598 if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0) 599 goto nla_put_failure; 600 601 if (cap_len > data_len && 602 nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) 603 goto nla_put_failure; 604 605 if (nfqnl_put_packet_info(skb, entskb, csum_verify)) 606 goto nla_put_failure; 607 608 if (data_len) { 609 struct nlattr *nla; 610 611 if (skb_tailroom(skb) < sizeof(*nla) + hlen) 612 goto nla_put_failure; 613 614 nla = skb_put(skb, sizeof(*nla)); 615 nla->nla_type = NFQA_PAYLOAD; 616 nla->nla_len = nla_attr_size(data_len); 617 618 if (skb_zerocopy(skb, entskb, data_len, hlen)) 619 goto nla_put_failure; 620 } 621 622 nlh->nlmsg_len = skb->len; 623 if (seclen) 624 security_release_secctx(secdata, seclen); 625 return skb; 626 627 nla_put_failure: 628 skb_tx_error(entskb); 629 kfree_skb(skb); 630 net_err_ratelimited("nf_queue: error creating packet message\n"); 631 nlmsg_failure: 632 if (seclen) 633 security_release_secctx(secdata, seclen); 634 return NULL; 635 } 636 637 static bool nf_ct_drop_unconfirmed(const struct nf_queue_entry *entry) 638 { 639 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 640 static const unsigned long flags = IPS_CONFIRMED | IPS_DYING; 641 const struct nf_conn *ct = (void *)skb_nfct(entry->skb); 642 643 if (ct && ((ct->status & flags) == IPS_DYING)) 644 return true; 645 #endif 646 return false; 647 } 648 649 static int 650 __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, 651 struct nf_queue_entry *entry) 652 { 653 struct sk_buff *nskb; 654 int err = -ENOBUFS; 655 __be32 *packet_id_ptr; 656 int failopen = 0; 657 658 nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr); 659 if (nskb == NULL) { 660 err = -ENOMEM; 661 goto err_out; 662 } 663 spin_lock_bh(&queue->lock); 664 665 if (nf_ct_drop_unconfirmed(entry)) 666 goto err_out_free_nskb; 667 668 if (queue->queue_total >= queue->queue_maxlen) { 669 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { 670 failopen = 1; 671 err = 0; 672 } else { 673 queue->queue_dropped++; 674 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", 675 queue->queue_total); 676 } 677 goto err_out_free_nskb; 678 } 679 entry->id = ++queue->id_sequence; 680 *packet_id_ptr = htonl(entry->id); 681 682 /* nfnetlink_unicast will either free the nskb or add it to a socket */ 683 err = nfnetlink_unicast(nskb, net, queue->peer_portid); 684 if (err < 0) { 685 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { 686 failopen = 1; 687 err = 0; 688 } else { 689 queue->queue_user_dropped++; 690 } 691 goto err_out_unlock; 692 } 693 694 __enqueue_entry(queue, entry); 695 696 spin_unlock_bh(&queue->lock); 697 return 0; 698 699 err_out_free_nskb: 700 kfree_skb(nskb); 701 err_out_unlock: 702 spin_unlock_bh(&queue->lock); 703 if (failopen) 704 nfqnl_reinject(entry, NF_ACCEPT); 705 err_out: 706 return err; 707 } 708 709 static struct nf_queue_entry * 710 nf_queue_entry_dup(struct nf_queue_entry *e) 711 { 712 struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); 713 if (entry) 714 nf_queue_entry_get_refs(entry); 715 return entry; 716 } 717 718 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 719 /* When called from bridge netfilter, skb->data must point to MAC header 720 * before calling skb_gso_segment(). Else, original MAC header is lost 721 * and segmented skbs will be sent to wrong destination. 722 */ 723 static void nf_bridge_adjust_skb_data(struct sk_buff *skb) 724 { 725 if (nf_bridge_info_get(skb)) 726 __skb_push(skb, skb->network_header - skb->mac_header); 727 } 728 729 static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) 730 { 731 if (nf_bridge_info_get(skb)) 732 __skb_pull(skb, skb->network_header - skb->mac_header); 733 } 734 #else 735 #define nf_bridge_adjust_skb_data(s) do {} while (0) 736 #define nf_bridge_adjust_segmented_data(s) do {} while (0) 737 #endif 738 739 static int 740 __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue, 741 struct sk_buff *skb, struct nf_queue_entry *entry) 742 { 743 int ret = -ENOMEM; 744 struct nf_queue_entry *entry_seg; 745 746 nf_bridge_adjust_segmented_data(skb); 747 748 if (skb->next == NULL) { /* last packet, no need to copy entry */ 749 struct sk_buff *gso_skb = entry->skb; 750 entry->skb = skb; 751 ret = __nfqnl_enqueue_packet(net, queue, entry); 752 if (ret) 753 entry->skb = gso_skb; 754 return ret; 755 } 756 757 skb_mark_not_on_list(skb); 758 759 entry_seg = nf_queue_entry_dup(entry); 760 if (entry_seg) { 761 entry_seg->skb = skb; 762 ret = __nfqnl_enqueue_packet(net, queue, entry_seg); 763 if (ret) 764 nf_queue_entry_free(entry_seg); 765 } 766 return ret; 767 } 768 769 static int 770 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) 771 { 772 unsigned int queued; 773 struct nfqnl_instance *queue; 774 struct sk_buff *skb, *segs, *nskb; 775 int err = -ENOBUFS; 776 struct net *net = entry->state.net; 777 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 778 779 /* rcu_read_lock()ed by nf_hook_thresh */ 780 queue = instance_lookup(q, queuenum); 781 if (!queue) 782 return -ESRCH; 783 784 if (queue->copy_mode == NFQNL_COPY_NONE) 785 return -EINVAL; 786 787 skb = entry->skb; 788 789 switch (entry->state.pf) { 790 case NFPROTO_IPV4: 791 skb->protocol = htons(ETH_P_IP); 792 break; 793 case NFPROTO_IPV6: 794 skb->protocol = htons(ETH_P_IPV6); 795 break; 796 } 797 798 if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb)) 799 return __nfqnl_enqueue_packet(net, queue, entry); 800 801 nf_bridge_adjust_skb_data(skb); 802 segs = skb_gso_segment(skb, 0); 803 /* Does not use PTR_ERR to limit the number of error codes that can be 804 * returned by nf_queue. For instance, callers rely on -ESRCH to 805 * mean 'ignore this hook'. 806 */ 807 if (IS_ERR_OR_NULL(segs)) 808 goto out_err; 809 queued = 0; 810 err = 0; 811 skb_list_walk_safe(segs, segs, nskb) { 812 if (err == 0) 813 err = __nfqnl_enqueue_packet_gso(net, queue, 814 segs, entry); 815 if (err == 0) 816 queued++; 817 else 818 kfree_skb(segs); 819 } 820 821 if (queued) { 822 if (err) /* some segments are already queued */ 823 nf_queue_entry_free(entry); 824 kfree_skb(skb); 825 return 0; 826 } 827 out_err: 828 nf_bridge_adjust_segmented_data(skb); 829 return err; 830 } 831 832 static int 833 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) 834 { 835 struct sk_buff *nskb; 836 837 if (diff < 0) { 838 if (pskb_trim(e->skb, data_len)) 839 return -ENOMEM; 840 } else if (diff > 0) { 841 if (data_len > 0xFFFF) 842 return -EINVAL; 843 if (diff > skb_tailroom(e->skb)) { 844 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), 845 diff, GFP_ATOMIC); 846 if (!nskb) 847 return -ENOMEM; 848 kfree_skb(e->skb); 849 e->skb = nskb; 850 } 851 skb_put(e->skb, diff); 852 } 853 if (skb_ensure_writable(e->skb, data_len)) 854 return -ENOMEM; 855 skb_copy_to_linear_data(e->skb, data, data_len); 856 e->skb->ip_summed = CHECKSUM_NONE; 857 return 0; 858 } 859 860 static int 861 nfqnl_set_mode(struct nfqnl_instance *queue, 862 unsigned char mode, unsigned int range) 863 { 864 int status = 0; 865 866 spin_lock_bh(&queue->lock); 867 switch (mode) { 868 case NFQNL_COPY_NONE: 869 case NFQNL_COPY_META: 870 queue->copy_mode = mode; 871 queue->copy_range = 0; 872 break; 873 874 case NFQNL_COPY_PACKET: 875 queue->copy_mode = mode; 876 if (range == 0 || range > NFQNL_MAX_COPY_RANGE) 877 queue->copy_range = NFQNL_MAX_COPY_RANGE; 878 else 879 queue->copy_range = range; 880 break; 881 882 default: 883 status = -EINVAL; 884 885 } 886 spin_unlock_bh(&queue->lock); 887 888 return status; 889 } 890 891 static int 892 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) 893 { 894 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 895 int physinif, physoutif; 896 897 physinif = nf_bridge_get_physinif(entry->skb); 898 physoutif = nf_bridge_get_physoutif(entry->skb); 899 900 if (physinif == ifindex || physoutif == ifindex) 901 return 1; 902 #endif 903 if (entry->state.in) 904 if (entry->state.in->ifindex == ifindex) 905 return 1; 906 if (entry->state.out) 907 if (entry->state.out->ifindex == ifindex) 908 return 1; 909 910 return 0; 911 } 912 913 /* drop all packets with either indev or outdev == ifindex from all queue 914 * instances */ 915 static void 916 nfqnl_dev_drop(struct net *net, int ifindex) 917 { 918 int i; 919 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 920 921 rcu_read_lock(); 922 923 for (i = 0; i < INSTANCE_BUCKETS; i++) { 924 struct nfqnl_instance *inst; 925 struct hlist_head *head = &q->instance_table[i]; 926 927 hlist_for_each_entry_rcu(inst, head, hlist) 928 nfqnl_flush(inst, dev_cmp, ifindex); 929 } 930 931 rcu_read_unlock(); 932 } 933 934 static int 935 nfqnl_rcv_dev_event(struct notifier_block *this, 936 unsigned long event, void *ptr) 937 { 938 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 939 940 /* Drop any packets associated with the downed device */ 941 if (event == NETDEV_DOWN) 942 nfqnl_dev_drop(dev_net(dev), dev->ifindex); 943 return NOTIFY_DONE; 944 } 945 946 static struct notifier_block nfqnl_dev_notifier = { 947 .notifier_call = nfqnl_rcv_dev_event, 948 }; 949 950 static void nfqnl_nf_hook_drop(struct net *net) 951 { 952 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 953 int i; 954 955 /* This function is also called on net namespace error unwind, 956 * when pernet_ops->init() failed and ->exit() functions of the 957 * previous pernet_ops gets called. 958 * 959 * This may result in a call to nfqnl_nf_hook_drop() before 960 * struct nfnl_queue_net was allocated. 961 */ 962 if (!q) 963 return; 964 965 for (i = 0; i < INSTANCE_BUCKETS; i++) { 966 struct nfqnl_instance *inst; 967 struct hlist_head *head = &q->instance_table[i]; 968 969 hlist_for_each_entry_rcu(inst, head, hlist) 970 nfqnl_flush(inst, NULL, 0); 971 } 972 } 973 974 static int 975 nfqnl_rcv_nl_event(struct notifier_block *this, 976 unsigned long event, void *ptr) 977 { 978 struct netlink_notify *n = ptr; 979 struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); 980 981 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { 982 int i; 983 984 /* destroy all instances for this portid */ 985 spin_lock(&q->instances_lock); 986 for (i = 0; i < INSTANCE_BUCKETS; i++) { 987 struct hlist_node *t2; 988 struct nfqnl_instance *inst; 989 struct hlist_head *head = &q->instance_table[i]; 990 991 hlist_for_each_entry_safe(inst, t2, head, hlist) { 992 if (n->portid == inst->peer_portid) 993 __instance_destroy(inst); 994 } 995 } 996 spin_unlock(&q->instances_lock); 997 } 998 return NOTIFY_DONE; 999 } 1000 1001 static struct notifier_block nfqnl_rtnl_notifier = { 1002 .notifier_call = nfqnl_rcv_nl_event, 1003 }; 1004 1005 static const struct nla_policy nfqa_vlan_policy[NFQA_VLAN_MAX + 1] = { 1006 [NFQA_VLAN_TCI] = { .type = NLA_U16}, 1007 [NFQA_VLAN_PROTO] = { .type = NLA_U16}, 1008 }; 1009 1010 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { 1011 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, 1012 [NFQA_MARK] = { .type = NLA_U32 }, 1013 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, 1014 [NFQA_CT] = { .type = NLA_UNSPEC }, 1015 [NFQA_EXP] = { .type = NLA_UNSPEC }, 1016 [NFQA_VLAN] = { .type = NLA_NESTED }, 1017 }; 1018 1019 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { 1020 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, 1021 [NFQA_MARK] = { .type = NLA_U32 }, 1022 }; 1023 1024 static struct nfqnl_instance * 1025 verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid) 1026 { 1027 struct nfqnl_instance *queue; 1028 1029 queue = instance_lookup(q, queue_num); 1030 if (!queue) 1031 return ERR_PTR(-ENODEV); 1032 1033 if (queue->peer_portid != nlportid) 1034 return ERR_PTR(-EPERM); 1035 1036 return queue; 1037 } 1038 1039 static struct nfqnl_msg_verdict_hdr* 1040 verdicthdr_get(const struct nlattr * const nfqa[]) 1041 { 1042 struct nfqnl_msg_verdict_hdr *vhdr; 1043 unsigned int verdict; 1044 1045 if (!nfqa[NFQA_VERDICT_HDR]) 1046 return NULL; 1047 1048 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); 1049 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; 1050 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) 1051 return NULL; 1052 return vhdr; 1053 } 1054 1055 static int nfq_id_after(unsigned int id, unsigned int max) 1056 { 1057 return (int)(id - max) > 0; 1058 } 1059 1060 static int nfqnl_recv_verdict_batch(struct sk_buff *skb, 1061 const struct nfnl_info *info, 1062 const struct nlattr * const nfqa[]) 1063 { 1064 struct nfnl_queue_net *q = nfnl_queue_pernet(info->net); 1065 u16 queue_num = ntohs(info->nfmsg->res_id); 1066 struct nf_queue_entry *entry, *tmp; 1067 struct nfqnl_msg_verdict_hdr *vhdr; 1068 struct nfqnl_instance *queue; 1069 unsigned int verdict, maxid; 1070 LIST_HEAD(batch_list); 1071 1072 queue = verdict_instance_lookup(q, queue_num, 1073 NETLINK_CB(skb).portid); 1074 if (IS_ERR(queue)) 1075 return PTR_ERR(queue); 1076 1077 vhdr = verdicthdr_get(nfqa); 1078 if (!vhdr) 1079 return -EINVAL; 1080 1081 verdict = ntohl(vhdr->verdict); 1082 maxid = ntohl(vhdr->id); 1083 1084 spin_lock_bh(&queue->lock); 1085 1086 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { 1087 if (nfq_id_after(entry->id, maxid)) 1088 break; 1089 __dequeue_entry(queue, entry); 1090 list_add_tail(&entry->list, &batch_list); 1091 } 1092 1093 spin_unlock_bh(&queue->lock); 1094 1095 if (list_empty(&batch_list)) 1096 return -ENOENT; 1097 1098 list_for_each_entry_safe(entry, tmp, &batch_list, list) { 1099 if (nfqa[NFQA_MARK]) 1100 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); 1101 1102 nfqnl_reinject(entry, verdict); 1103 } 1104 return 0; 1105 } 1106 1107 static struct nf_conn *nfqnl_ct_parse(const struct nfnl_ct_hook *nfnl_ct, 1108 const struct nlmsghdr *nlh, 1109 const struct nlattr * const nfqa[], 1110 struct nf_queue_entry *entry, 1111 enum ip_conntrack_info *ctinfo) 1112 { 1113 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 1114 struct nf_conn *ct; 1115 1116 ct = nf_ct_get(entry->skb, ctinfo); 1117 if (ct == NULL) 1118 return NULL; 1119 1120 if (nfnl_ct->parse(nfqa[NFQA_CT], ct) < 0) 1121 return NULL; 1122 1123 if (nfqa[NFQA_EXP]) 1124 nfnl_ct->attach_expect(nfqa[NFQA_EXP], ct, 1125 NETLINK_CB(entry->skb).portid, 1126 nlmsg_report(nlh)); 1127 return ct; 1128 #else 1129 return NULL; 1130 #endif 1131 } 1132 1133 static int nfqa_parse_bridge(struct nf_queue_entry *entry, 1134 const struct nlattr * const nfqa[]) 1135 { 1136 if (nfqa[NFQA_VLAN]) { 1137 struct nlattr *tb[NFQA_VLAN_MAX + 1]; 1138 int err; 1139 1140 err = nla_parse_nested_deprecated(tb, NFQA_VLAN_MAX, 1141 nfqa[NFQA_VLAN], 1142 nfqa_vlan_policy, NULL); 1143 if (err < 0) 1144 return err; 1145 1146 if (!tb[NFQA_VLAN_TCI] || !tb[NFQA_VLAN_PROTO]) 1147 return -EINVAL; 1148 1149 __vlan_hwaccel_put_tag(entry->skb, 1150 nla_get_be16(tb[NFQA_VLAN_PROTO]), 1151 ntohs(nla_get_be16(tb[NFQA_VLAN_TCI]))); 1152 } 1153 1154 if (nfqa[NFQA_L2HDR]) { 1155 int mac_header_len = entry->skb->network_header - 1156 entry->skb->mac_header; 1157 1158 if (mac_header_len != nla_len(nfqa[NFQA_L2HDR])) 1159 return -EINVAL; 1160 else if (mac_header_len > 0) 1161 memcpy(skb_mac_header(entry->skb), 1162 nla_data(nfqa[NFQA_L2HDR]), 1163 mac_header_len); 1164 } 1165 1166 return 0; 1167 } 1168 1169 static int nfqnl_recv_verdict(struct sk_buff *skb, const struct nfnl_info *info, 1170 const struct nlattr * const nfqa[]) 1171 { 1172 struct nfnl_queue_net *q = nfnl_queue_pernet(info->net); 1173 u_int16_t queue_num = ntohs(info->nfmsg->res_id); 1174 const struct nfnl_ct_hook *nfnl_ct; 1175 struct nfqnl_msg_verdict_hdr *vhdr; 1176 enum ip_conntrack_info ctinfo; 1177 struct nfqnl_instance *queue; 1178 struct nf_queue_entry *entry; 1179 struct nf_conn *ct = NULL; 1180 unsigned int verdict; 1181 int err; 1182 1183 queue = verdict_instance_lookup(q, queue_num, 1184 NETLINK_CB(skb).portid); 1185 if (IS_ERR(queue)) 1186 return PTR_ERR(queue); 1187 1188 vhdr = verdicthdr_get(nfqa); 1189 if (!vhdr) 1190 return -EINVAL; 1191 1192 verdict = ntohl(vhdr->verdict); 1193 1194 entry = find_dequeue_entry(queue, ntohl(vhdr->id)); 1195 if (entry == NULL) 1196 return -ENOENT; 1197 1198 /* rcu lock already held from nfnl->call_rcu. */ 1199 nfnl_ct = rcu_dereference(nfnl_ct_hook); 1200 1201 if (nfqa[NFQA_CT]) { 1202 if (nfnl_ct != NULL) 1203 ct = nfqnl_ct_parse(nfnl_ct, info->nlh, nfqa, entry, 1204 &ctinfo); 1205 } 1206 1207 if (entry->state.pf == PF_BRIDGE) { 1208 err = nfqa_parse_bridge(entry, nfqa); 1209 if (err < 0) 1210 return err; 1211 } 1212 1213 if (nfqa[NFQA_PAYLOAD]) { 1214 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); 1215 int diff = payload_len - entry->skb->len; 1216 1217 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), 1218 payload_len, entry, diff) < 0) 1219 verdict = NF_DROP; 1220 1221 if (ct && diff) 1222 nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff); 1223 } 1224 1225 if (nfqa[NFQA_MARK]) 1226 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); 1227 1228 nfqnl_reinject(entry, verdict); 1229 return 0; 1230 } 1231 1232 static int nfqnl_recv_unsupp(struct sk_buff *skb, const struct nfnl_info *info, 1233 const struct nlattr * const cda[]) 1234 { 1235 return -ENOTSUPP; 1236 } 1237 1238 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { 1239 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, 1240 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, 1241 [NFQA_CFG_QUEUE_MAXLEN] = { .type = NLA_U32 }, 1242 [NFQA_CFG_MASK] = { .type = NLA_U32 }, 1243 [NFQA_CFG_FLAGS] = { .type = NLA_U32 }, 1244 }; 1245 1246 static const struct nf_queue_handler nfqh = { 1247 .outfn = nfqnl_enqueue_packet, 1248 .nf_hook_drop = nfqnl_nf_hook_drop, 1249 }; 1250 1251 static int nfqnl_recv_config(struct sk_buff *skb, const struct nfnl_info *info, 1252 const struct nlattr * const nfqa[]) 1253 { 1254 struct nfnl_queue_net *q = nfnl_queue_pernet(info->net); 1255 u_int16_t queue_num = ntohs(info->nfmsg->res_id); 1256 struct nfqnl_msg_config_cmd *cmd = NULL; 1257 struct nfqnl_instance *queue; 1258 __u32 flags = 0, mask = 0; 1259 int ret = 0; 1260 1261 if (nfqa[NFQA_CFG_CMD]) { 1262 cmd = nla_data(nfqa[NFQA_CFG_CMD]); 1263 1264 /* Obsolete commands without queue context */ 1265 switch (cmd->command) { 1266 case NFQNL_CFG_CMD_PF_BIND: return 0; 1267 case NFQNL_CFG_CMD_PF_UNBIND: return 0; 1268 } 1269 } 1270 1271 /* Check if we support these flags in first place, dependencies should 1272 * be there too not to break atomicity. 1273 */ 1274 if (nfqa[NFQA_CFG_FLAGS]) { 1275 if (!nfqa[NFQA_CFG_MASK]) { 1276 /* A mask is needed to specify which flags are being 1277 * changed. 1278 */ 1279 return -EINVAL; 1280 } 1281 1282 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); 1283 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); 1284 1285 if (flags >= NFQA_CFG_F_MAX) 1286 return -EOPNOTSUPP; 1287 1288 #if !IS_ENABLED(CONFIG_NETWORK_SECMARK) 1289 if (flags & mask & NFQA_CFG_F_SECCTX) 1290 return -EOPNOTSUPP; 1291 #endif 1292 if ((flags & mask & NFQA_CFG_F_CONNTRACK) && 1293 !rcu_access_pointer(nfnl_ct_hook)) { 1294 #ifdef CONFIG_MODULES 1295 nfnl_unlock(NFNL_SUBSYS_QUEUE); 1296 request_module("ip_conntrack_netlink"); 1297 nfnl_lock(NFNL_SUBSYS_QUEUE); 1298 if (rcu_access_pointer(nfnl_ct_hook)) 1299 return -EAGAIN; 1300 #endif 1301 return -EOPNOTSUPP; 1302 } 1303 } 1304 1305 rcu_read_lock(); 1306 queue = instance_lookup(q, queue_num); 1307 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { 1308 ret = -EPERM; 1309 goto err_out_unlock; 1310 } 1311 1312 if (cmd != NULL) { 1313 switch (cmd->command) { 1314 case NFQNL_CFG_CMD_BIND: 1315 if (queue) { 1316 ret = -EBUSY; 1317 goto err_out_unlock; 1318 } 1319 queue = instance_create(q, queue_num, 1320 NETLINK_CB(skb).portid); 1321 if (IS_ERR(queue)) { 1322 ret = PTR_ERR(queue); 1323 goto err_out_unlock; 1324 } 1325 break; 1326 case NFQNL_CFG_CMD_UNBIND: 1327 if (!queue) { 1328 ret = -ENODEV; 1329 goto err_out_unlock; 1330 } 1331 instance_destroy(q, queue); 1332 goto err_out_unlock; 1333 case NFQNL_CFG_CMD_PF_BIND: 1334 case NFQNL_CFG_CMD_PF_UNBIND: 1335 break; 1336 default: 1337 ret = -ENOTSUPP; 1338 goto err_out_unlock; 1339 } 1340 } 1341 1342 if (!queue) { 1343 ret = -ENODEV; 1344 goto err_out_unlock; 1345 } 1346 1347 if (nfqa[NFQA_CFG_PARAMS]) { 1348 struct nfqnl_msg_config_params *params = 1349 nla_data(nfqa[NFQA_CFG_PARAMS]); 1350 1351 nfqnl_set_mode(queue, params->copy_mode, 1352 ntohl(params->copy_range)); 1353 } 1354 1355 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { 1356 __be32 *queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); 1357 1358 spin_lock_bh(&queue->lock); 1359 queue->queue_maxlen = ntohl(*queue_maxlen); 1360 spin_unlock_bh(&queue->lock); 1361 } 1362 1363 if (nfqa[NFQA_CFG_FLAGS]) { 1364 spin_lock_bh(&queue->lock); 1365 queue->flags &= ~mask; 1366 queue->flags |= flags & mask; 1367 spin_unlock_bh(&queue->lock); 1368 } 1369 1370 err_out_unlock: 1371 rcu_read_unlock(); 1372 return ret; 1373 } 1374 1375 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { 1376 [NFQNL_MSG_PACKET] = { 1377 .call = nfqnl_recv_unsupp, 1378 .type = NFNL_CB_RCU, 1379 .attr_count = NFQA_MAX, 1380 }, 1381 [NFQNL_MSG_VERDICT] = { 1382 .call = nfqnl_recv_verdict, 1383 .type = NFNL_CB_RCU, 1384 .attr_count = NFQA_MAX, 1385 .policy = nfqa_verdict_policy 1386 }, 1387 [NFQNL_MSG_CONFIG] = { 1388 .call = nfqnl_recv_config, 1389 .type = NFNL_CB_MUTEX, 1390 .attr_count = NFQA_CFG_MAX, 1391 .policy = nfqa_cfg_policy 1392 }, 1393 [NFQNL_MSG_VERDICT_BATCH] = { 1394 .call = nfqnl_recv_verdict_batch, 1395 .type = NFNL_CB_RCU, 1396 .attr_count = NFQA_MAX, 1397 .policy = nfqa_verdict_batch_policy 1398 }, 1399 }; 1400 1401 static const struct nfnetlink_subsystem nfqnl_subsys = { 1402 .name = "nf_queue", 1403 .subsys_id = NFNL_SUBSYS_QUEUE, 1404 .cb_count = NFQNL_MSG_MAX, 1405 .cb = nfqnl_cb, 1406 }; 1407 1408 #ifdef CONFIG_PROC_FS 1409 struct iter_state { 1410 struct seq_net_private p; 1411 unsigned int bucket; 1412 }; 1413 1414 static struct hlist_node *get_first(struct seq_file *seq) 1415 { 1416 struct iter_state *st = seq->private; 1417 struct net *net; 1418 struct nfnl_queue_net *q; 1419 1420 if (!st) 1421 return NULL; 1422 1423 net = seq_file_net(seq); 1424 q = nfnl_queue_pernet(net); 1425 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { 1426 if (!hlist_empty(&q->instance_table[st->bucket])) 1427 return q->instance_table[st->bucket].first; 1428 } 1429 return NULL; 1430 } 1431 1432 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) 1433 { 1434 struct iter_state *st = seq->private; 1435 struct net *net = seq_file_net(seq); 1436 1437 h = h->next; 1438 while (!h) { 1439 struct nfnl_queue_net *q; 1440 1441 if (++st->bucket >= INSTANCE_BUCKETS) 1442 return NULL; 1443 1444 q = nfnl_queue_pernet(net); 1445 h = q->instance_table[st->bucket].first; 1446 } 1447 return h; 1448 } 1449 1450 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) 1451 { 1452 struct hlist_node *head; 1453 head = get_first(seq); 1454 1455 if (head) 1456 while (pos && (head = get_next(seq, head))) 1457 pos--; 1458 return pos ? NULL : head; 1459 } 1460 1461 static void *seq_start(struct seq_file *s, loff_t *pos) 1462 __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) 1463 { 1464 spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); 1465 return get_idx(s, *pos); 1466 } 1467 1468 static void *seq_next(struct seq_file *s, void *v, loff_t *pos) 1469 { 1470 (*pos)++; 1471 return get_next(s, v); 1472 } 1473 1474 static void seq_stop(struct seq_file *s, void *v) 1475 __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) 1476 { 1477 spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); 1478 } 1479 1480 static int seq_show(struct seq_file *s, void *v) 1481 { 1482 const struct nfqnl_instance *inst = v; 1483 1484 seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n", 1485 inst->queue_num, 1486 inst->peer_portid, inst->queue_total, 1487 inst->copy_mode, inst->copy_range, 1488 inst->queue_dropped, inst->queue_user_dropped, 1489 inst->id_sequence, 1); 1490 return 0; 1491 } 1492 1493 static const struct seq_operations nfqnl_seq_ops = { 1494 .start = seq_start, 1495 .next = seq_next, 1496 .stop = seq_stop, 1497 .show = seq_show, 1498 }; 1499 #endif /* PROC_FS */ 1500 1501 static int __net_init nfnl_queue_net_init(struct net *net) 1502 { 1503 unsigned int i; 1504 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1505 1506 for (i = 0; i < INSTANCE_BUCKETS; i++) 1507 INIT_HLIST_HEAD(&q->instance_table[i]); 1508 1509 spin_lock_init(&q->instances_lock); 1510 1511 #ifdef CONFIG_PROC_FS 1512 if (!proc_create_net("nfnetlink_queue", 0440, net->nf.proc_netfilter, 1513 &nfqnl_seq_ops, sizeof(struct iter_state))) 1514 return -ENOMEM; 1515 #endif 1516 return 0; 1517 } 1518 1519 static void __net_exit nfnl_queue_net_exit(struct net *net) 1520 { 1521 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1522 unsigned int i; 1523 1524 #ifdef CONFIG_PROC_FS 1525 remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); 1526 #endif 1527 for (i = 0; i < INSTANCE_BUCKETS; i++) 1528 WARN_ON_ONCE(!hlist_empty(&q->instance_table[i])); 1529 } 1530 1531 static struct pernet_operations nfnl_queue_net_ops = { 1532 .init = nfnl_queue_net_init, 1533 .exit = nfnl_queue_net_exit, 1534 .id = &nfnl_queue_net_id, 1535 .size = sizeof(struct nfnl_queue_net), 1536 }; 1537 1538 static int __init nfnetlink_queue_init(void) 1539 { 1540 int status; 1541 1542 status = register_pernet_subsys(&nfnl_queue_net_ops); 1543 if (status < 0) { 1544 pr_err("failed to register pernet ops\n"); 1545 goto out; 1546 } 1547 1548 netlink_register_notifier(&nfqnl_rtnl_notifier); 1549 status = nfnetlink_subsys_register(&nfqnl_subsys); 1550 if (status < 0) { 1551 pr_err("failed to create netlink socket\n"); 1552 goto cleanup_netlink_notifier; 1553 } 1554 1555 status = register_netdevice_notifier(&nfqnl_dev_notifier); 1556 if (status < 0) { 1557 pr_err("failed to register netdevice notifier\n"); 1558 goto cleanup_netlink_subsys; 1559 } 1560 1561 nf_register_queue_handler(&nfqh); 1562 1563 return status; 1564 1565 cleanup_netlink_subsys: 1566 nfnetlink_subsys_unregister(&nfqnl_subsys); 1567 cleanup_netlink_notifier: 1568 netlink_unregister_notifier(&nfqnl_rtnl_notifier); 1569 unregister_pernet_subsys(&nfnl_queue_net_ops); 1570 out: 1571 return status; 1572 } 1573 1574 static void __exit nfnetlink_queue_fini(void) 1575 { 1576 nf_unregister_queue_handler(); 1577 unregister_netdevice_notifier(&nfqnl_dev_notifier); 1578 nfnetlink_subsys_unregister(&nfqnl_subsys); 1579 netlink_unregister_notifier(&nfqnl_rtnl_notifier); 1580 unregister_pernet_subsys(&nfnl_queue_net_ops); 1581 1582 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1583 } 1584 1585 MODULE_DESCRIPTION("netfilter packet queue handler"); 1586 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); 1587 MODULE_LICENSE("GPL"); 1588 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); 1589 1590 module_init(nfnetlink_queue_init); 1591 module_exit(nfnetlink_queue_fini); 1592