1 /* 2 * This is a module which is used for queueing packets and communicating with 3 * userspace via nfnetlink. 4 * 5 * (C) 2005 by Harald Welte <laforge@netfilter.org> 6 * (C) 2007 by Patrick McHardy <kaber@trash.net> 7 * 8 * Based on the old ipv4-only ip_queue.c: 9 * (C) 2000-2002 James Morris <jmorris@intercode.com.au> 10 * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org> 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License version 2 as 14 * published by the Free Software Foundation. 15 * 16 */ 17 #include <linux/module.h> 18 #include <linux/skbuff.h> 19 #include <linux/init.h> 20 #include <linux/spinlock.h> 21 #include <linux/slab.h> 22 #include <linux/notifier.h> 23 #include <linux/netdevice.h> 24 #include <linux/netfilter.h> 25 #include <linux/proc_fs.h> 26 #include <linux/netfilter_ipv4.h> 27 #include <linux/netfilter_ipv6.h> 28 #include <linux/netfilter_bridge.h> 29 #include <linux/netfilter/nfnetlink.h> 30 #include <linux/netfilter/nfnetlink_queue.h> 31 #include <linux/netfilter/nf_conntrack_common.h> 32 #include <linux/list.h> 33 #include <net/sock.h> 34 #include <net/tcp_states.h> 35 #include <net/netfilter/nf_queue.h> 36 #include <net/netns/generic.h> 37 38 #include <linux/atomic.h> 39 40 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 41 #include "../bridge/br_private.h" 42 #endif 43 44 #define NFQNL_QMAX_DEFAULT 1024 45 46 /* We're using struct nlattr which has 16bit nla_len. Note that nla_len 47 * includes the header length. Thus, the maximum packet length that we 48 * support is 65531 bytes. We send truncated packets if the specified length 49 * is larger than that. Userspace can check for presence of NFQA_CAP_LEN 50 * attribute to detect truncation. 51 */ 52 #define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN) 53 54 struct nfqnl_instance { 55 struct hlist_node hlist; /* global list of queues */ 56 struct rcu_head rcu; 57 58 u32 peer_portid; 59 unsigned int queue_maxlen; 60 unsigned int copy_range; 61 unsigned int queue_dropped; 62 unsigned int queue_user_dropped; 63 64 65 u_int16_t queue_num; /* number of this queue */ 66 u_int8_t copy_mode; 67 u_int32_t flags; /* Set using NFQA_CFG_FLAGS */ 68 /* 69 * Following fields are dirtied for each queued packet, 70 * keep them in same cache line if possible. 71 */ 72 spinlock_t lock; 73 unsigned int queue_total; 74 unsigned int id_sequence; /* 'sequence' of pkt ids */ 75 struct list_head queue_list; /* packets in queue */ 76 }; 77 78 typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long); 79 80 static int nfnl_queue_net_id __read_mostly; 81 82 #define INSTANCE_BUCKETS 16 83 struct nfnl_queue_net { 84 spinlock_t instances_lock; 85 struct hlist_head instance_table[INSTANCE_BUCKETS]; 86 }; 87 88 static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net) 89 { 90 return net_generic(net, nfnl_queue_net_id); 91 } 92 93 static inline u_int8_t instance_hashfn(u_int16_t queue_num) 94 { 95 return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS; 96 } 97 98 static struct nfqnl_instance * 99 instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num) 100 { 101 struct hlist_head *head; 102 struct nfqnl_instance *inst; 103 104 head = &q->instance_table[instance_hashfn(queue_num)]; 105 hlist_for_each_entry_rcu(inst, head, hlist) { 106 if (inst->queue_num == queue_num) 107 return inst; 108 } 109 return NULL; 110 } 111 112 static struct nfqnl_instance * 113 instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, u32 portid) 114 { 115 struct nfqnl_instance *inst; 116 unsigned int h; 117 int err; 118 119 spin_lock(&q->instances_lock); 120 if (instance_lookup(q, queue_num)) { 121 err = -EEXIST; 122 goto out_unlock; 123 } 124 125 inst = kzalloc(sizeof(*inst), GFP_ATOMIC); 126 if (!inst) { 127 err = -ENOMEM; 128 goto out_unlock; 129 } 130 131 inst->queue_num = queue_num; 132 inst->peer_portid = portid; 133 inst->queue_maxlen = NFQNL_QMAX_DEFAULT; 134 inst->copy_range = NFQNL_MAX_COPY_RANGE; 135 inst->copy_mode = NFQNL_COPY_NONE; 136 spin_lock_init(&inst->lock); 137 INIT_LIST_HEAD(&inst->queue_list); 138 139 if (!try_module_get(THIS_MODULE)) { 140 err = -EAGAIN; 141 goto out_free; 142 } 143 144 h = instance_hashfn(queue_num); 145 hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]); 146 147 spin_unlock(&q->instances_lock); 148 149 return inst; 150 151 out_free: 152 kfree(inst); 153 out_unlock: 154 spin_unlock(&q->instances_lock); 155 return ERR_PTR(err); 156 } 157 158 static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, 159 unsigned long data); 160 161 static void 162 instance_destroy_rcu(struct rcu_head *head) 163 { 164 struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance, 165 rcu); 166 167 nfqnl_flush(inst, NULL, 0); 168 kfree(inst); 169 module_put(THIS_MODULE); 170 } 171 172 static void 173 __instance_destroy(struct nfqnl_instance *inst) 174 { 175 hlist_del_rcu(&inst->hlist); 176 call_rcu(&inst->rcu, instance_destroy_rcu); 177 } 178 179 static void 180 instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst) 181 { 182 spin_lock(&q->instances_lock); 183 __instance_destroy(inst); 184 spin_unlock(&q->instances_lock); 185 } 186 187 static inline void 188 __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) 189 { 190 list_add_tail(&entry->list, &queue->queue_list); 191 queue->queue_total++; 192 } 193 194 static void 195 __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) 196 { 197 list_del(&entry->list); 198 queue->queue_total--; 199 } 200 201 static struct nf_queue_entry * 202 find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id) 203 { 204 struct nf_queue_entry *entry = NULL, *i; 205 206 spin_lock_bh(&queue->lock); 207 208 list_for_each_entry(i, &queue->queue_list, list) { 209 if (i->id == id) { 210 entry = i; 211 break; 212 } 213 } 214 215 if (entry) 216 __dequeue_entry(queue, entry); 217 218 spin_unlock_bh(&queue->lock); 219 220 return entry; 221 } 222 223 static void 224 nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) 225 { 226 struct nf_queue_entry *entry, *next; 227 228 spin_lock_bh(&queue->lock); 229 list_for_each_entry_safe(entry, next, &queue->queue_list, list) { 230 if (!cmpfn || cmpfn(entry, data)) { 231 list_del(&entry->list); 232 queue->queue_total--; 233 nf_reinject(entry, NF_DROP); 234 } 235 } 236 spin_unlock_bh(&queue->lock); 237 } 238 239 static int 240 nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet, 241 bool csum_verify) 242 { 243 __u32 flags = 0; 244 245 if (packet->ip_summed == CHECKSUM_PARTIAL) 246 flags = NFQA_SKB_CSUMNOTREADY; 247 else if (csum_verify) 248 flags = NFQA_SKB_CSUM_NOTVERIFIED; 249 250 if (skb_is_gso(packet)) 251 flags |= NFQA_SKB_GSO; 252 253 return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0; 254 } 255 256 static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk) 257 { 258 const struct cred *cred; 259 260 if (!sk_fullsock(sk)) 261 return 0; 262 263 read_lock_bh(&sk->sk_callback_lock); 264 if (sk->sk_socket && sk->sk_socket->file) { 265 cred = sk->sk_socket->file->f_cred; 266 if (nla_put_be32(skb, NFQA_UID, 267 htonl(from_kuid_munged(&init_user_ns, cred->fsuid)))) 268 goto nla_put_failure; 269 if (nla_put_be32(skb, NFQA_GID, 270 htonl(from_kgid_munged(&init_user_ns, cred->fsgid)))) 271 goto nla_put_failure; 272 } 273 read_unlock_bh(&sk->sk_callback_lock); 274 return 0; 275 276 nla_put_failure: 277 read_unlock_bh(&sk->sk_callback_lock); 278 return -1; 279 } 280 281 static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata) 282 { 283 u32 seclen = 0; 284 #if IS_ENABLED(CONFIG_NETWORK_SECMARK) 285 if (!skb || !sk_fullsock(skb->sk)) 286 return 0; 287 288 read_lock_bh(&skb->sk->sk_callback_lock); 289 290 if (skb->secmark) 291 security_secid_to_secctx(skb->secmark, secdata, &seclen); 292 293 read_unlock_bh(&skb->sk->sk_callback_lock); 294 #endif 295 return seclen; 296 } 297 298 static struct sk_buff * 299 nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, 300 struct nf_queue_entry *entry, 301 __be32 **packet_id_ptr) 302 { 303 size_t size; 304 size_t data_len = 0, cap_len = 0, rem_len = 0; 305 unsigned int hlen = 0; 306 struct sk_buff *skb; 307 struct nlattr *nla; 308 struct nfqnl_msg_packet_hdr *pmsg; 309 struct nlmsghdr *nlh; 310 struct nfgenmsg *nfmsg; 311 struct sk_buff *entskb = entry->skb; 312 struct net_device *indev; 313 struct net_device *outdev; 314 struct nf_conn *ct = NULL; 315 enum ip_conntrack_info uninitialized_var(ctinfo); 316 struct nfnl_ct_hook *nfnl_ct; 317 bool csum_verify; 318 char *secdata = NULL; 319 u32 seclen = 0; 320 321 size = nlmsg_total_size(sizeof(struct nfgenmsg)) 322 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) 323 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 324 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 325 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 326 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 327 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 328 #endif 329 + nla_total_size(sizeof(u_int32_t)) /* mark */ 330 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) 331 + nla_total_size(sizeof(u_int32_t)) /* skbinfo */ 332 + nla_total_size(sizeof(u_int32_t)); /* cap_len */ 333 334 if (entskb->tstamp.tv64) 335 size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); 336 337 if (entry->state.hook <= NF_INET_FORWARD || 338 (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL)) 339 csum_verify = !skb_csum_unnecessary(entskb); 340 else 341 csum_verify = false; 342 343 outdev = entry->state.out; 344 345 switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) { 346 case NFQNL_COPY_META: 347 case NFQNL_COPY_NONE: 348 break; 349 350 case NFQNL_COPY_PACKET: 351 if (!(queue->flags & NFQA_CFG_F_GSO) && 352 entskb->ip_summed == CHECKSUM_PARTIAL && 353 skb_checksum_help(entskb)) 354 return NULL; 355 356 data_len = ACCESS_ONCE(queue->copy_range); 357 if (data_len > entskb->len) 358 data_len = entskb->len; 359 360 hlen = skb_zerocopy_headlen(entskb); 361 hlen = min_t(unsigned int, hlen, data_len); 362 size += sizeof(struct nlattr) + hlen; 363 cap_len = entskb->len; 364 rem_len = data_len - hlen; 365 break; 366 } 367 368 if (queue->flags & NFQA_CFG_F_CONNTRACK) { 369 nfnl_ct = rcu_dereference(nfnl_ct_hook); 370 if (nfnl_ct != NULL) { 371 ct = nfnl_ct->get_ct(entskb, &ctinfo); 372 if (ct != NULL) 373 size += nfnl_ct->build_size(ct); 374 } 375 } 376 377 if (queue->flags & NFQA_CFG_F_UID_GID) { 378 size += (nla_total_size(sizeof(u_int32_t)) /* uid */ 379 + nla_total_size(sizeof(u_int32_t))); /* gid */ 380 } 381 382 if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) { 383 seclen = nfqnl_get_sk_secctx(entskb, &secdata); 384 if (seclen) 385 size += nla_total_size(seclen); 386 } 387 388 skb = __netlink_alloc_skb(net->nfnl, size, rem_len, queue->peer_portid, 389 GFP_ATOMIC); 390 if (!skb) { 391 skb_tx_error(entskb); 392 return NULL; 393 } 394 395 nlh = nlmsg_put(skb, 0, 0, 396 NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, 397 sizeof(struct nfgenmsg), 0); 398 if (!nlh) { 399 skb_tx_error(entskb); 400 kfree_skb(skb); 401 return NULL; 402 } 403 nfmsg = nlmsg_data(nlh); 404 nfmsg->nfgen_family = entry->state.pf; 405 nfmsg->version = NFNETLINK_V0; 406 nfmsg->res_id = htons(queue->queue_num); 407 408 nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); 409 pmsg = nla_data(nla); 410 pmsg->hw_protocol = entskb->protocol; 411 pmsg->hook = entry->state.hook; 412 *packet_id_ptr = &pmsg->packet_id; 413 414 indev = entry->state.in; 415 if (indev) { 416 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 417 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) 418 goto nla_put_failure; 419 #else 420 if (entry->state.pf == PF_BRIDGE) { 421 /* Case 1: indev is physical input device, we need to 422 * look for bridge group (when called from 423 * netfilter_bridge) */ 424 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, 425 htonl(indev->ifindex)) || 426 /* this is the bridge group "brX" */ 427 /* rcu_read_lock()ed by __nf_queue */ 428 nla_put_be32(skb, NFQA_IFINDEX_INDEV, 429 htonl(br_port_get_rcu(indev)->br->dev->ifindex))) 430 goto nla_put_failure; 431 } else { 432 int physinif; 433 434 /* Case 2: indev is bridge group, we need to look for 435 * physical device (when called from ipv4) */ 436 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, 437 htonl(indev->ifindex))) 438 goto nla_put_failure; 439 440 physinif = nf_bridge_get_physinif(entskb); 441 if (physinif && 442 nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, 443 htonl(physinif))) 444 goto nla_put_failure; 445 } 446 #endif 447 } 448 449 if (outdev) { 450 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 451 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) 452 goto nla_put_failure; 453 #else 454 if (entry->state.pf == PF_BRIDGE) { 455 /* Case 1: outdev is physical output device, we need to 456 * look for bridge group (when called from 457 * netfilter_bridge) */ 458 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, 459 htonl(outdev->ifindex)) || 460 /* this is the bridge group "brX" */ 461 /* rcu_read_lock()ed by __nf_queue */ 462 nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, 463 htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) 464 goto nla_put_failure; 465 } else { 466 int physoutif; 467 468 /* Case 2: outdev is bridge group, we need to look for 469 * physical output device (when called from ipv4) */ 470 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, 471 htonl(outdev->ifindex))) 472 goto nla_put_failure; 473 474 physoutif = nf_bridge_get_physoutif(entskb); 475 if (physoutif && 476 nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, 477 htonl(physoutif))) 478 goto nla_put_failure; 479 } 480 #endif 481 } 482 483 if (entskb->mark && 484 nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) 485 goto nla_put_failure; 486 487 if (indev && entskb->dev && 488 entskb->mac_header != entskb->network_header) { 489 struct nfqnl_msg_packet_hw phw; 490 int len; 491 492 memset(&phw, 0, sizeof(phw)); 493 len = dev_parse_header(entskb, phw.hw_addr); 494 if (len) { 495 phw.hw_addrlen = htons(len); 496 if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) 497 goto nla_put_failure; 498 } 499 } 500 501 if (entskb->tstamp.tv64) { 502 struct nfqnl_msg_packet_timestamp ts; 503 struct timespec64 kts = ktime_to_timespec64(skb->tstamp); 504 505 ts.sec = cpu_to_be64(kts.tv_sec); 506 ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC); 507 508 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) 509 goto nla_put_failure; 510 } 511 512 if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk && 513 nfqnl_put_sk_uidgid(skb, entskb->sk) < 0) 514 goto nla_put_failure; 515 516 if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata)) 517 goto nla_put_failure; 518 519 if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0) 520 goto nla_put_failure; 521 522 if (cap_len > data_len && 523 nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) 524 goto nla_put_failure; 525 526 if (nfqnl_put_packet_info(skb, entskb, csum_verify)) 527 goto nla_put_failure; 528 529 if (data_len) { 530 struct nlattr *nla; 531 532 if (skb_tailroom(skb) < sizeof(*nla) + hlen) 533 goto nla_put_failure; 534 535 nla = (struct nlattr *)skb_put(skb, sizeof(*nla)); 536 nla->nla_type = NFQA_PAYLOAD; 537 nla->nla_len = nla_attr_size(data_len); 538 539 if (skb_zerocopy(skb, entskb, data_len, hlen)) 540 goto nla_put_failure; 541 } 542 543 nlh->nlmsg_len = skb->len; 544 return skb; 545 546 nla_put_failure: 547 skb_tx_error(entskb); 548 kfree_skb(skb); 549 net_err_ratelimited("nf_queue: error creating packet message\n"); 550 return NULL; 551 } 552 553 static int 554 __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, 555 struct nf_queue_entry *entry) 556 { 557 struct sk_buff *nskb; 558 int err = -ENOBUFS; 559 __be32 *packet_id_ptr; 560 int failopen = 0; 561 562 nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr); 563 if (nskb == NULL) { 564 err = -ENOMEM; 565 goto err_out; 566 } 567 spin_lock_bh(&queue->lock); 568 569 if (queue->queue_total >= queue->queue_maxlen) { 570 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { 571 failopen = 1; 572 err = 0; 573 } else { 574 queue->queue_dropped++; 575 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", 576 queue->queue_total); 577 } 578 goto err_out_free_nskb; 579 } 580 entry->id = ++queue->id_sequence; 581 *packet_id_ptr = htonl(entry->id); 582 583 /* nfnetlink_unicast will either free the nskb or add it to a socket */ 584 err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT); 585 if (err < 0) { 586 queue->queue_user_dropped++; 587 goto err_out_unlock; 588 } 589 590 __enqueue_entry(queue, entry); 591 592 spin_unlock_bh(&queue->lock); 593 return 0; 594 595 err_out_free_nskb: 596 kfree_skb(nskb); 597 err_out_unlock: 598 spin_unlock_bh(&queue->lock); 599 if (failopen) 600 nf_reinject(entry, NF_ACCEPT); 601 err_out: 602 return err; 603 } 604 605 static struct nf_queue_entry * 606 nf_queue_entry_dup(struct nf_queue_entry *e) 607 { 608 struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); 609 if (entry) 610 nf_queue_entry_get_refs(entry); 611 return entry; 612 } 613 614 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 615 /* When called from bridge netfilter, skb->data must point to MAC header 616 * before calling skb_gso_segment(). Else, original MAC header is lost 617 * and segmented skbs will be sent to wrong destination. 618 */ 619 static void nf_bridge_adjust_skb_data(struct sk_buff *skb) 620 { 621 if (skb->nf_bridge) 622 __skb_push(skb, skb->network_header - skb->mac_header); 623 } 624 625 static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) 626 { 627 if (skb->nf_bridge) 628 __skb_pull(skb, skb->network_header - skb->mac_header); 629 } 630 #else 631 #define nf_bridge_adjust_skb_data(s) do {} while (0) 632 #define nf_bridge_adjust_segmented_data(s) do {} while (0) 633 #endif 634 635 static void free_entry(struct nf_queue_entry *entry) 636 { 637 nf_queue_entry_release_refs(entry); 638 kfree(entry); 639 } 640 641 static int 642 __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue, 643 struct sk_buff *skb, struct nf_queue_entry *entry) 644 { 645 int ret = -ENOMEM; 646 struct nf_queue_entry *entry_seg; 647 648 nf_bridge_adjust_segmented_data(skb); 649 650 if (skb->next == NULL) { /* last packet, no need to copy entry */ 651 struct sk_buff *gso_skb = entry->skb; 652 entry->skb = skb; 653 ret = __nfqnl_enqueue_packet(net, queue, entry); 654 if (ret) 655 entry->skb = gso_skb; 656 return ret; 657 } 658 659 skb->next = NULL; 660 661 entry_seg = nf_queue_entry_dup(entry); 662 if (entry_seg) { 663 entry_seg->skb = skb; 664 ret = __nfqnl_enqueue_packet(net, queue, entry_seg); 665 if (ret) 666 free_entry(entry_seg); 667 } 668 return ret; 669 } 670 671 static int 672 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) 673 { 674 unsigned int queued; 675 struct nfqnl_instance *queue; 676 struct sk_buff *skb, *segs; 677 int err = -ENOBUFS; 678 struct net *net = entry->state.net; 679 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 680 681 /* rcu_read_lock()ed by nf_hook_slow() */ 682 queue = instance_lookup(q, queuenum); 683 if (!queue) 684 return -ESRCH; 685 686 if (queue->copy_mode == NFQNL_COPY_NONE) 687 return -EINVAL; 688 689 skb = entry->skb; 690 691 switch (entry->state.pf) { 692 case NFPROTO_IPV4: 693 skb->protocol = htons(ETH_P_IP); 694 break; 695 case NFPROTO_IPV6: 696 skb->protocol = htons(ETH_P_IPV6); 697 break; 698 } 699 700 if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb)) 701 return __nfqnl_enqueue_packet(net, queue, entry); 702 703 nf_bridge_adjust_skb_data(skb); 704 segs = skb_gso_segment(skb, 0); 705 /* Does not use PTR_ERR to limit the number of error codes that can be 706 * returned by nf_queue. For instance, callers rely on -ESRCH to 707 * mean 'ignore this hook'. 708 */ 709 if (IS_ERR_OR_NULL(segs)) 710 goto out_err; 711 queued = 0; 712 err = 0; 713 do { 714 struct sk_buff *nskb = segs->next; 715 if (err == 0) 716 err = __nfqnl_enqueue_packet_gso(net, queue, 717 segs, entry); 718 if (err == 0) 719 queued++; 720 else 721 kfree_skb(segs); 722 segs = nskb; 723 } while (segs); 724 725 if (queued) { 726 if (err) /* some segments are already queued */ 727 free_entry(entry); 728 kfree_skb(skb); 729 return 0; 730 } 731 out_err: 732 nf_bridge_adjust_segmented_data(skb); 733 return err; 734 } 735 736 static int 737 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) 738 { 739 struct sk_buff *nskb; 740 741 if (diff < 0) { 742 if (pskb_trim(e->skb, data_len)) 743 return -ENOMEM; 744 } else if (diff > 0) { 745 if (data_len > 0xFFFF) 746 return -EINVAL; 747 if (diff > skb_tailroom(e->skb)) { 748 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), 749 diff, GFP_ATOMIC); 750 if (!nskb) { 751 printk(KERN_WARNING "nf_queue: OOM " 752 "in mangle, dropping packet\n"); 753 return -ENOMEM; 754 } 755 kfree_skb(e->skb); 756 e->skb = nskb; 757 } 758 skb_put(e->skb, diff); 759 } 760 if (!skb_make_writable(e->skb, data_len)) 761 return -ENOMEM; 762 skb_copy_to_linear_data(e->skb, data, data_len); 763 e->skb->ip_summed = CHECKSUM_NONE; 764 return 0; 765 } 766 767 static int 768 nfqnl_set_mode(struct nfqnl_instance *queue, 769 unsigned char mode, unsigned int range) 770 { 771 int status = 0; 772 773 spin_lock_bh(&queue->lock); 774 switch (mode) { 775 case NFQNL_COPY_NONE: 776 case NFQNL_COPY_META: 777 queue->copy_mode = mode; 778 queue->copy_range = 0; 779 break; 780 781 case NFQNL_COPY_PACKET: 782 queue->copy_mode = mode; 783 if (range == 0 || range > NFQNL_MAX_COPY_RANGE) 784 queue->copy_range = NFQNL_MAX_COPY_RANGE; 785 else 786 queue->copy_range = range; 787 break; 788 789 default: 790 status = -EINVAL; 791 792 } 793 spin_unlock_bh(&queue->lock); 794 795 return status; 796 } 797 798 static int 799 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) 800 { 801 if (entry->state.in) 802 if (entry->state.in->ifindex == ifindex) 803 return 1; 804 if (entry->state.out) 805 if (entry->state.out->ifindex == ifindex) 806 return 1; 807 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 808 if (entry->skb->nf_bridge) { 809 int physinif, physoutif; 810 811 physinif = nf_bridge_get_physinif(entry->skb); 812 physoutif = nf_bridge_get_physoutif(entry->skb); 813 814 if (physinif == ifindex || physoutif == ifindex) 815 return 1; 816 } 817 #endif 818 return 0; 819 } 820 821 /* drop all packets with either indev or outdev == ifindex from all queue 822 * instances */ 823 static void 824 nfqnl_dev_drop(struct net *net, int ifindex) 825 { 826 int i; 827 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 828 829 rcu_read_lock(); 830 831 for (i = 0; i < INSTANCE_BUCKETS; i++) { 832 struct nfqnl_instance *inst; 833 struct hlist_head *head = &q->instance_table[i]; 834 835 hlist_for_each_entry_rcu(inst, head, hlist) 836 nfqnl_flush(inst, dev_cmp, ifindex); 837 } 838 839 rcu_read_unlock(); 840 } 841 842 static int 843 nfqnl_rcv_dev_event(struct notifier_block *this, 844 unsigned long event, void *ptr) 845 { 846 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 847 848 /* Drop any packets associated with the downed device */ 849 if (event == NETDEV_DOWN) 850 nfqnl_dev_drop(dev_net(dev), dev->ifindex); 851 return NOTIFY_DONE; 852 } 853 854 static struct notifier_block nfqnl_dev_notifier = { 855 .notifier_call = nfqnl_rcv_dev_event, 856 }; 857 858 static int nf_hook_cmp(struct nf_queue_entry *entry, unsigned long ops_ptr) 859 { 860 return entry->elem == (struct nf_hook_ops *)ops_ptr; 861 } 862 863 static void nfqnl_nf_hook_drop(struct net *net, struct nf_hook_ops *hook) 864 { 865 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 866 int i; 867 868 rcu_read_lock(); 869 for (i = 0; i < INSTANCE_BUCKETS; i++) { 870 struct nfqnl_instance *inst; 871 struct hlist_head *head = &q->instance_table[i]; 872 873 hlist_for_each_entry_rcu(inst, head, hlist) 874 nfqnl_flush(inst, nf_hook_cmp, (unsigned long)hook); 875 } 876 rcu_read_unlock(); 877 } 878 879 static int 880 nfqnl_rcv_nl_event(struct notifier_block *this, 881 unsigned long event, void *ptr) 882 { 883 struct netlink_notify *n = ptr; 884 struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); 885 886 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { 887 int i; 888 889 /* destroy all instances for this portid */ 890 spin_lock(&q->instances_lock); 891 for (i = 0; i < INSTANCE_BUCKETS; i++) { 892 struct hlist_node *t2; 893 struct nfqnl_instance *inst; 894 struct hlist_head *head = &q->instance_table[i]; 895 896 hlist_for_each_entry_safe(inst, t2, head, hlist) { 897 if (n->portid == inst->peer_portid) 898 __instance_destroy(inst); 899 } 900 } 901 spin_unlock(&q->instances_lock); 902 } 903 return NOTIFY_DONE; 904 } 905 906 static struct notifier_block nfqnl_rtnl_notifier = { 907 .notifier_call = nfqnl_rcv_nl_event, 908 }; 909 910 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { 911 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, 912 [NFQA_MARK] = { .type = NLA_U32 }, 913 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, 914 [NFQA_CT] = { .type = NLA_UNSPEC }, 915 [NFQA_EXP] = { .type = NLA_UNSPEC }, 916 }; 917 918 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { 919 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, 920 [NFQA_MARK] = { .type = NLA_U32 }, 921 }; 922 923 static struct nfqnl_instance * 924 verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid) 925 { 926 struct nfqnl_instance *queue; 927 928 queue = instance_lookup(q, queue_num); 929 if (!queue) 930 return ERR_PTR(-ENODEV); 931 932 if (queue->peer_portid != nlportid) 933 return ERR_PTR(-EPERM); 934 935 return queue; 936 } 937 938 static struct nfqnl_msg_verdict_hdr* 939 verdicthdr_get(const struct nlattr * const nfqa[]) 940 { 941 struct nfqnl_msg_verdict_hdr *vhdr; 942 unsigned int verdict; 943 944 if (!nfqa[NFQA_VERDICT_HDR]) 945 return NULL; 946 947 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); 948 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; 949 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) 950 return NULL; 951 return vhdr; 952 } 953 954 static int nfq_id_after(unsigned int id, unsigned int max) 955 { 956 return (int)(id - max) > 0; 957 } 958 959 static int 960 nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb, 961 const struct nlmsghdr *nlh, 962 const struct nlattr * const nfqa[]) 963 { 964 struct nfgenmsg *nfmsg = nlmsg_data(nlh); 965 struct nf_queue_entry *entry, *tmp; 966 unsigned int verdict, maxid; 967 struct nfqnl_msg_verdict_hdr *vhdr; 968 struct nfqnl_instance *queue; 969 LIST_HEAD(batch_list); 970 u16 queue_num = ntohs(nfmsg->res_id); 971 972 struct net *net = sock_net(ctnl); 973 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 974 975 queue = verdict_instance_lookup(q, queue_num, 976 NETLINK_CB(skb).portid); 977 if (IS_ERR(queue)) 978 return PTR_ERR(queue); 979 980 vhdr = verdicthdr_get(nfqa); 981 if (!vhdr) 982 return -EINVAL; 983 984 verdict = ntohl(vhdr->verdict); 985 maxid = ntohl(vhdr->id); 986 987 spin_lock_bh(&queue->lock); 988 989 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { 990 if (nfq_id_after(entry->id, maxid)) 991 break; 992 __dequeue_entry(queue, entry); 993 list_add_tail(&entry->list, &batch_list); 994 } 995 996 spin_unlock_bh(&queue->lock); 997 998 if (list_empty(&batch_list)) 999 return -ENOENT; 1000 1001 list_for_each_entry_safe(entry, tmp, &batch_list, list) { 1002 if (nfqa[NFQA_MARK]) 1003 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); 1004 nf_reinject(entry, verdict); 1005 } 1006 return 0; 1007 } 1008 1009 static struct nf_conn *nfqnl_ct_parse(struct nfnl_ct_hook *nfnl_ct, 1010 const struct nlmsghdr *nlh, 1011 const struct nlattr * const nfqa[], 1012 struct nf_queue_entry *entry, 1013 enum ip_conntrack_info *ctinfo) 1014 { 1015 struct nf_conn *ct; 1016 1017 ct = nfnl_ct->get_ct(entry->skb, ctinfo); 1018 if (ct == NULL) 1019 return NULL; 1020 1021 if (nfnl_ct->parse(nfqa[NFQA_CT], ct) < 0) 1022 return NULL; 1023 1024 if (nfqa[NFQA_EXP]) 1025 nfnl_ct->attach_expect(nfqa[NFQA_EXP], ct, 1026 NETLINK_CB(entry->skb).portid, 1027 nlmsg_report(nlh)); 1028 return ct; 1029 } 1030 1031 static int 1032 nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, 1033 const struct nlmsghdr *nlh, 1034 const struct nlattr * const nfqa[]) 1035 { 1036 struct nfgenmsg *nfmsg = nlmsg_data(nlh); 1037 u_int16_t queue_num = ntohs(nfmsg->res_id); 1038 1039 struct nfqnl_msg_verdict_hdr *vhdr; 1040 struct nfqnl_instance *queue; 1041 unsigned int verdict; 1042 struct nf_queue_entry *entry; 1043 enum ip_conntrack_info uninitialized_var(ctinfo); 1044 struct nfnl_ct_hook *nfnl_ct; 1045 struct nf_conn *ct = NULL; 1046 1047 struct net *net = sock_net(ctnl); 1048 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1049 1050 queue = instance_lookup(q, queue_num); 1051 if (!queue) 1052 queue = verdict_instance_lookup(q, queue_num, 1053 NETLINK_CB(skb).portid); 1054 if (IS_ERR(queue)) 1055 return PTR_ERR(queue); 1056 1057 vhdr = verdicthdr_get(nfqa); 1058 if (!vhdr) 1059 return -EINVAL; 1060 1061 verdict = ntohl(vhdr->verdict); 1062 1063 entry = find_dequeue_entry(queue, ntohl(vhdr->id)); 1064 if (entry == NULL) 1065 return -ENOENT; 1066 1067 if (nfqa[NFQA_CT]) { 1068 /* rcu lock already held from nfnl->call_rcu. */ 1069 nfnl_ct = rcu_dereference(nfnl_ct_hook); 1070 if (nfnl_ct != NULL) 1071 ct = nfqnl_ct_parse(nfnl_ct, nlh, nfqa, entry, &ctinfo); 1072 } 1073 1074 if (nfqa[NFQA_PAYLOAD]) { 1075 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); 1076 int diff = payload_len - entry->skb->len; 1077 1078 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), 1079 payload_len, entry, diff) < 0) 1080 verdict = NF_DROP; 1081 1082 if (ct && diff) 1083 nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff); 1084 } 1085 1086 if (nfqa[NFQA_MARK]) 1087 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); 1088 1089 nf_reinject(entry, verdict); 1090 return 0; 1091 } 1092 1093 static int 1094 nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, 1095 const struct nlmsghdr *nlh, 1096 const struct nlattr * const nfqa[]) 1097 { 1098 return -ENOTSUPP; 1099 } 1100 1101 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { 1102 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, 1103 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, 1104 }; 1105 1106 static const struct nf_queue_handler nfqh = { 1107 .outfn = &nfqnl_enqueue_packet, 1108 .nf_hook_drop = &nfqnl_nf_hook_drop, 1109 }; 1110 1111 static int 1112 nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, 1113 const struct nlmsghdr *nlh, 1114 const struct nlattr * const nfqa[]) 1115 { 1116 struct nfgenmsg *nfmsg = nlmsg_data(nlh); 1117 u_int16_t queue_num = ntohs(nfmsg->res_id); 1118 struct nfqnl_instance *queue; 1119 struct nfqnl_msg_config_cmd *cmd = NULL; 1120 struct net *net = sock_net(ctnl); 1121 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1122 int ret = 0; 1123 1124 if (nfqa[NFQA_CFG_CMD]) { 1125 cmd = nla_data(nfqa[NFQA_CFG_CMD]); 1126 1127 /* Obsolete commands without queue context */ 1128 switch (cmd->command) { 1129 case NFQNL_CFG_CMD_PF_BIND: return 0; 1130 case NFQNL_CFG_CMD_PF_UNBIND: return 0; 1131 } 1132 } 1133 1134 rcu_read_lock(); 1135 queue = instance_lookup(q, queue_num); 1136 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { 1137 ret = -EPERM; 1138 goto err_out_unlock; 1139 } 1140 1141 if (cmd != NULL) { 1142 switch (cmd->command) { 1143 case NFQNL_CFG_CMD_BIND: 1144 if (queue) { 1145 ret = -EBUSY; 1146 goto err_out_unlock; 1147 } 1148 queue = instance_create(q, queue_num, 1149 NETLINK_CB(skb).portid); 1150 if (IS_ERR(queue)) { 1151 ret = PTR_ERR(queue); 1152 goto err_out_unlock; 1153 } 1154 break; 1155 case NFQNL_CFG_CMD_UNBIND: 1156 if (!queue) { 1157 ret = -ENODEV; 1158 goto err_out_unlock; 1159 } 1160 instance_destroy(q, queue); 1161 break; 1162 case NFQNL_CFG_CMD_PF_BIND: 1163 case NFQNL_CFG_CMD_PF_UNBIND: 1164 break; 1165 default: 1166 ret = -ENOTSUPP; 1167 break; 1168 } 1169 } 1170 1171 if (nfqa[NFQA_CFG_PARAMS]) { 1172 struct nfqnl_msg_config_params *params; 1173 1174 if (!queue) { 1175 ret = -ENODEV; 1176 goto err_out_unlock; 1177 } 1178 params = nla_data(nfqa[NFQA_CFG_PARAMS]); 1179 nfqnl_set_mode(queue, params->copy_mode, 1180 ntohl(params->copy_range)); 1181 } 1182 1183 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { 1184 __be32 *queue_maxlen; 1185 1186 if (!queue) { 1187 ret = -ENODEV; 1188 goto err_out_unlock; 1189 } 1190 queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); 1191 spin_lock_bh(&queue->lock); 1192 queue->queue_maxlen = ntohl(*queue_maxlen); 1193 spin_unlock_bh(&queue->lock); 1194 } 1195 1196 if (nfqa[NFQA_CFG_FLAGS]) { 1197 __u32 flags, mask; 1198 1199 if (!queue) { 1200 ret = -ENODEV; 1201 goto err_out_unlock; 1202 } 1203 1204 if (!nfqa[NFQA_CFG_MASK]) { 1205 /* A mask is needed to specify which flags are being 1206 * changed. 1207 */ 1208 ret = -EINVAL; 1209 goto err_out_unlock; 1210 } 1211 1212 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); 1213 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); 1214 1215 if (flags >= NFQA_CFG_F_MAX) { 1216 ret = -EOPNOTSUPP; 1217 goto err_out_unlock; 1218 } 1219 #if !IS_ENABLED(CONFIG_NETWORK_SECMARK) 1220 if (flags & mask & NFQA_CFG_F_SECCTX) { 1221 ret = -EOPNOTSUPP; 1222 goto err_out_unlock; 1223 } 1224 #endif 1225 spin_lock_bh(&queue->lock); 1226 queue->flags &= ~mask; 1227 queue->flags |= flags & mask; 1228 spin_unlock_bh(&queue->lock); 1229 } 1230 1231 err_out_unlock: 1232 rcu_read_unlock(); 1233 return ret; 1234 } 1235 1236 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { 1237 [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, 1238 .attr_count = NFQA_MAX, }, 1239 [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, 1240 .attr_count = NFQA_MAX, 1241 .policy = nfqa_verdict_policy }, 1242 [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, 1243 .attr_count = NFQA_CFG_MAX, 1244 .policy = nfqa_cfg_policy }, 1245 [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, 1246 .attr_count = NFQA_MAX, 1247 .policy = nfqa_verdict_batch_policy }, 1248 }; 1249 1250 static const struct nfnetlink_subsystem nfqnl_subsys = { 1251 .name = "nf_queue", 1252 .subsys_id = NFNL_SUBSYS_QUEUE, 1253 .cb_count = NFQNL_MSG_MAX, 1254 .cb = nfqnl_cb, 1255 }; 1256 1257 #ifdef CONFIG_PROC_FS 1258 struct iter_state { 1259 struct seq_net_private p; 1260 unsigned int bucket; 1261 }; 1262 1263 static struct hlist_node *get_first(struct seq_file *seq) 1264 { 1265 struct iter_state *st = seq->private; 1266 struct net *net; 1267 struct nfnl_queue_net *q; 1268 1269 if (!st) 1270 return NULL; 1271 1272 net = seq_file_net(seq); 1273 q = nfnl_queue_pernet(net); 1274 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { 1275 if (!hlist_empty(&q->instance_table[st->bucket])) 1276 return q->instance_table[st->bucket].first; 1277 } 1278 return NULL; 1279 } 1280 1281 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) 1282 { 1283 struct iter_state *st = seq->private; 1284 struct net *net = seq_file_net(seq); 1285 1286 h = h->next; 1287 while (!h) { 1288 struct nfnl_queue_net *q; 1289 1290 if (++st->bucket >= INSTANCE_BUCKETS) 1291 return NULL; 1292 1293 q = nfnl_queue_pernet(net); 1294 h = q->instance_table[st->bucket].first; 1295 } 1296 return h; 1297 } 1298 1299 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) 1300 { 1301 struct hlist_node *head; 1302 head = get_first(seq); 1303 1304 if (head) 1305 while (pos && (head = get_next(seq, head))) 1306 pos--; 1307 return pos ? NULL : head; 1308 } 1309 1310 static void *seq_start(struct seq_file *s, loff_t *pos) 1311 __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) 1312 { 1313 spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); 1314 return get_idx(s, *pos); 1315 } 1316 1317 static void *seq_next(struct seq_file *s, void *v, loff_t *pos) 1318 { 1319 (*pos)++; 1320 return get_next(s, v); 1321 } 1322 1323 static void seq_stop(struct seq_file *s, void *v) 1324 __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) 1325 { 1326 spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); 1327 } 1328 1329 static int seq_show(struct seq_file *s, void *v) 1330 { 1331 const struct nfqnl_instance *inst = v; 1332 1333 seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n", 1334 inst->queue_num, 1335 inst->peer_portid, inst->queue_total, 1336 inst->copy_mode, inst->copy_range, 1337 inst->queue_dropped, inst->queue_user_dropped, 1338 inst->id_sequence, 1); 1339 return 0; 1340 } 1341 1342 static const struct seq_operations nfqnl_seq_ops = { 1343 .start = seq_start, 1344 .next = seq_next, 1345 .stop = seq_stop, 1346 .show = seq_show, 1347 }; 1348 1349 static int nfqnl_open(struct inode *inode, struct file *file) 1350 { 1351 return seq_open_net(inode, file, &nfqnl_seq_ops, 1352 sizeof(struct iter_state)); 1353 } 1354 1355 static const struct file_operations nfqnl_file_ops = { 1356 .owner = THIS_MODULE, 1357 .open = nfqnl_open, 1358 .read = seq_read, 1359 .llseek = seq_lseek, 1360 .release = seq_release_net, 1361 }; 1362 1363 #endif /* PROC_FS */ 1364 1365 static int __net_init nfnl_queue_net_init(struct net *net) 1366 { 1367 unsigned int i; 1368 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1369 1370 for (i = 0; i < INSTANCE_BUCKETS; i++) 1371 INIT_HLIST_HEAD(&q->instance_table[i]); 1372 1373 spin_lock_init(&q->instances_lock); 1374 1375 #ifdef CONFIG_PROC_FS 1376 if (!proc_create("nfnetlink_queue", 0440, 1377 net->nf.proc_netfilter, &nfqnl_file_ops)) 1378 return -ENOMEM; 1379 #endif 1380 return 0; 1381 } 1382 1383 static void __net_exit nfnl_queue_net_exit(struct net *net) 1384 { 1385 #ifdef CONFIG_PROC_FS 1386 remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); 1387 #endif 1388 } 1389 1390 static struct pernet_operations nfnl_queue_net_ops = { 1391 .init = nfnl_queue_net_init, 1392 .exit = nfnl_queue_net_exit, 1393 .id = &nfnl_queue_net_id, 1394 .size = sizeof(struct nfnl_queue_net), 1395 }; 1396 1397 static int __init nfnetlink_queue_init(void) 1398 { 1399 int status; 1400 1401 status = register_pernet_subsys(&nfnl_queue_net_ops); 1402 if (status < 0) { 1403 pr_err("nf_queue: failed to register pernet ops\n"); 1404 goto out; 1405 } 1406 1407 netlink_register_notifier(&nfqnl_rtnl_notifier); 1408 status = nfnetlink_subsys_register(&nfqnl_subsys); 1409 if (status < 0) { 1410 pr_err("nf_queue: failed to create netlink socket\n"); 1411 goto cleanup_netlink_notifier; 1412 } 1413 1414 register_netdevice_notifier(&nfqnl_dev_notifier); 1415 nf_register_queue_handler(&nfqh); 1416 return status; 1417 1418 cleanup_netlink_notifier: 1419 netlink_unregister_notifier(&nfqnl_rtnl_notifier); 1420 out: 1421 return status; 1422 } 1423 1424 static void __exit nfnetlink_queue_fini(void) 1425 { 1426 nf_unregister_queue_handler(); 1427 unregister_netdevice_notifier(&nfqnl_dev_notifier); 1428 nfnetlink_subsys_unregister(&nfqnl_subsys); 1429 netlink_unregister_notifier(&nfqnl_rtnl_notifier); 1430 unregister_pernet_subsys(&nfnl_queue_net_ops); 1431 1432 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1433 } 1434 1435 MODULE_DESCRIPTION("netfilter packet queue handler"); 1436 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); 1437 MODULE_LICENSE("GPL"); 1438 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); 1439 1440 module_init(nfnetlink_queue_init); 1441 module_exit(nfnetlink_queue_fini); 1442