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 nfnl_ct = rcu_dereference(nfnl_ct_hook); 369 370 if (queue->flags & NFQA_CFG_F_CONNTRACK) { 371 if (nfnl_ct != NULL) { 372 ct = nfnl_ct->get_ct(entskb, &ctinfo); 373 if (ct != NULL) 374 size += nfnl_ct->build_size(ct); 375 } 376 } 377 378 if (queue->flags & NFQA_CFG_F_UID_GID) { 379 size += (nla_total_size(sizeof(u_int32_t)) /* uid */ 380 + nla_total_size(sizeof(u_int32_t))); /* gid */ 381 } 382 383 if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) { 384 seclen = nfqnl_get_sk_secctx(entskb, &secdata); 385 if (seclen) 386 size += nla_total_size(seclen); 387 } 388 389 skb = __netlink_alloc_skb(net->nfnl, size, rem_len, queue->peer_portid, 390 GFP_ATOMIC); 391 if (!skb) { 392 skb_tx_error(entskb); 393 return NULL; 394 } 395 396 nlh = nlmsg_put(skb, 0, 0, 397 NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, 398 sizeof(struct nfgenmsg), 0); 399 if (!nlh) { 400 skb_tx_error(entskb); 401 kfree_skb(skb); 402 return NULL; 403 } 404 nfmsg = nlmsg_data(nlh); 405 nfmsg->nfgen_family = entry->state.pf; 406 nfmsg->version = NFNETLINK_V0; 407 nfmsg->res_id = htons(queue->queue_num); 408 409 nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); 410 pmsg = nla_data(nla); 411 pmsg->hw_protocol = entskb->protocol; 412 pmsg->hook = entry->state.hook; 413 *packet_id_ptr = &pmsg->packet_id; 414 415 indev = entry->state.in; 416 if (indev) { 417 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 418 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) 419 goto nla_put_failure; 420 #else 421 if (entry->state.pf == PF_BRIDGE) { 422 /* Case 1: indev is physical input device, we need to 423 * look for bridge group (when called from 424 * netfilter_bridge) */ 425 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, 426 htonl(indev->ifindex)) || 427 /* this is the bridge group "brX" */ 428 /* rcu_read_lock()ed by __nf_queue */ 429 nla_put_be32(skb, NFQA_IFINDEX_INDEV, 430 htonl(br_port_get_rcu(indev)->br->dev->ifindex))) 431 goto nla_put_failure; 432 } else { 433 int physinif; 434 435 /* Case 2: indev is bridge group, we need to look for 436 * physical device (when called from ipv4) */ 437 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, 438 htonl(indev->ifindex))) 439 goto nla_put_failure; 440 441 physinif = nf_bridge_get_physinif(entskb); 442 if (physinif && 443 nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, 444 htonl(physinif))) 445 goto nla_put_failure; 446 } 447 #endif 448 } 449 450 if (outdev) { 451 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 452 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) 453 goto nla_put_failure; 454 #else 455 if (entry->state.pf == PF_BRIDGE) { 456 /* Case 1: outdev is physical output device, we need to 457 * look for bridge group (when called from 458 * netfilter_bridge) */ 459 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, 460 htonl(outdev->ifindex)) || 461 /* this is the bridge group "brX" */ 462 /* rcu_read_lock()ed by __nf_queue */ 463 nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, 464 htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) 465 goto nla_put_failure; 466 } else { 467 int physoutif; 468 469 /* Case 2: outdev is bridge group, we need to look for 470 * physical output device (when called from ipv4) */ 471 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, 472 htonl(outdev->ifindex))) 473 goto nla_put_failure; 474 475 physoutif = nf_bridge_get_physoutif(entskb); 476 if (physoutif && 477 nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, 478 htonl(physoutif))) 479 goto nla_put_failure; 480 } 481 #endif 482 } 483 484 if (entskb->mark && 485 nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) 486 goto nla_put_failure; 487 488 if (indev && entskb->dev && 489 entskb->mac_header != entskb->network_header) { 490 struct nfqnl_msg_packet_hw phw; 491 int len; 492 493 memset(&phw, 0, sizeof(phw)); 494 len = dev_parse_header(entskb, phw.hw_addr); 495 if (len) { 496 phw.hw_addrlen = htons(len); 497 if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) 498 goto nla_put_failure; 499 } 500 } 501 502 if (entskb->tstamp.tv64) { 503 struct nfqnl_msg_packet_timestamp ts; 504 struct timespec64 kts = ktime_to_timespec64(skb->tstamp); 505 506 ts.sec = cpu_to_be64(kts.tv_sec); 507 ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC); 508 509 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) 510 goto nla_put_failure; 511 } 512 513 if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk && 514 nfqnl_put_sk_uidgid(skb, entskb->sk) < 0) 515 goto nla_put_failure; 516 517 if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata)) 518 goto nla_put_failure; 519 520 if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0) 521 goto nla_put_failure; 522 523 if (cap_len > data_len && 524 nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) 525 goto nla_put_failure; 526 527 if (nfqnl_put_packet_info(skb, entskb, csum_verify)) 528 goto nla_put_failure; 529 530 if (data_len) { 531 struct nlattr *nla; 532 533 if (skb_tailroom(skb) < sizeof(*nla) + hlen) 534 goto nla_put_failure; 535 536 nla = (struct nlattr *)skb_put(skb, sizeof(*nla)); 537 nla->nla_type = NFQA_PAYLOAD; 538 nla->nla_len = nla_attr_size(data_len); 539 540 if (skb_zerocopy(skb, entskb, data_len, hlen)) 541 goto nla_put_failure; 542 } 543 544 nlh->nlmsg_len = skb->len; 545 return skb; 546 547 nla_put_failure: 548 skb_tx_error(entskb); 549 kfree_skb(skb); 550 net_err_ratelimited("nf_queue: error creating packet message\n"); 551 return NULL; 552 } 553 554 static int 555 __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, 556 struct nf_queue_entry *entry) 557 { 558 struct sk_buff *nskb; 559 int err = -ENOBUFS; 560 __be32 *packet_id_ptr; 561 int failopen = 0; 562 563 nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr); 564 if (nskb == NULL) { 565 err = -ENOMEM; 566 goto err_out; 567 } 568 spin_lock_bh(&queue->lock); 569 570 if (queue->queue_total >= queue->queue_maxlen) { 571 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { 572 failopen = 1; 573 err = 0; 574 } else { 575 queue->queue_dropped++; 576 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", 577 queue->queue_total); 578 } 579 goto err_out_free_nskb; 580 } 581 entry->id = ++queue->id_sequence; 582 *packet_id_ptr = htonl(entry->id); 583 584 /* nfnetlink_unicast will either free the nskb or add it to a socket */ 585 err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT); 586 if (err < 0) { 587 queue->queue_user_dropped++; 588 goto err_out_unlock; 589 } 590 591 __enqueue_entry(queue, entry); 592 593 spin_unlock_bh(&queue->lock); 594 return 0; 595 596 err_out_free_nskb: 597 kfree_skb(nskb); 598 err_out_unlock: 599 spin_unlock_bh(&queue->lock); 600 if (failopen) 601 nf_reinject(entry, NF_ACCEPT); 602 err_out: 603 return err; 604 } 605 606 static struct nf_queue_entry * 607 nf_queue_entry_dup(struct nf_queue_entry *e) 608 { 609 struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); 610 if (entry) 611 nf_queue_entry_get_refs(entry); 612 return entry; 613 } 614 615 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 616 /* When called from bridge netfilter, skb->data must point to MAC header 617 * before calling skb_gso_segment(). Else, original MAC header is lost 618 * and segmented skbs will be sent to wrong destination. 619 */ 620 static void nf_bridge_adjust_skb_data(struct sk_buff *skb) 621 { 622 if (skb->nf_bridge) 623 __skb_push(skb, skb->network_header - skb->mac_header); 624 } 625 626 static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) 627 { 628 if (skb->nf_bridge) 629 __skb_pull(skb, skb->network_header - skb->mac_header); 630 } 631 #else 632 #define nf_bridge_adjust_skb_data(s) do {} while (0) 633 #define nf_bridge_adjust_segmented_data(s) do {} while (0) 634 #endif 635 636 static void free_entry(struct nf_queue_entry *entry) 637 { 638 nf_queue_entry_release_refs(entry); 639 kfree(entry); 640 } 641 642 static int 643 __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue, 644 struct sk_buff *skb, struct nf_queue_entry *entry) 645 { 646 int ret = -ENOMEM; 647 struct nf_queue_entry *entry_seg; 648 649 nf_bridge_adjust_segmented_data(skb); 650 651 if (skb->next == NULL) { /* last packet, no need to copy entry */ 652 struct sk_buff *gso_skb = entry->skb; 653 entry->skb = skb; 654 ret = __nfqnl_enqueue_packet(net, queue, entry); 655 if (ret) 656 entry->skb = gso_skb; 657 return ret; 658 } 659 660 skb->next = NULL; 661 662 entry_seg = nf_queue_entry_dup(entry); 663 if (entry_seg) { 664 entry_seg->skb = skb; 665 ret = __nfqnl_enqueue_packet(net, queue, entry_seg); 666 if (ret) 667 free_entry(entry_seg); 668 } 669 return ret; 670 } 671 672 static int 673 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) 674 { 675 unsigned int queued; 676 struct nfqnl_instance *queue; 677 struct sk_buff *skb, *segs; 678 int err = -ENOBUFS; 679 struct net *net = entry->state.net; 680 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 681 682 /* rcu_read_lock()ed by nf_hook_slow() */ 683 queue = instance_lookup(q, queuenum); 684 if (!queue) 685 return -ESRCH; 686 687 if (queue->copy_mode == NFQNL_COPY_NONE) 688 return -EINVAL; 689 690 skb = entry->skb; 691 692 switch (entry->state.pf) { 693 case NFPROTO_IPV4: 694 skb->protocol = htons(ETH_P_IP); 695 break; 696 case NFPROTO_IPV6: 697 skb->protocol = htons(ETH_P_IPV6); 698 break; 699 } 700 701 if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb)) 702 return __nfqnl_enqueue_packet(net, queue, entry); 703 704 nf_bridge_adjust_skb_data(skb); 705 segs = skb_gso_segment(skb, 0); 706 /* Does not use PTR_ERR to limit the number of error codes that can be 707 * returned by nf_queue. For instance, callers rely on -ESRCH to 708 * mean 'ignore this hook'. 709 */ 710 if (IS_ERR_OR_NULL(segs)) 711 goto out_err; 712 queued = 0; 713 err = 0; 714 do { 715 struct sk_buff *nskb = segs->next; 716 if (err == 0) 717 err = __nfqnl_enqueue_packet_gso(net, queue, 718 segs, entry); 719 if (err == 0) 720 queued++; 721 else 722 kfree_skb(segs); 723 segs = nskb; 724 } while (segs); 725 726 if (queued) { 727 if (err) /* some segments are already queued */ 728 free_entry(entry); 729 kfree_skb(skb); 730 return 0; 731 } 732 out_err: 733 nf_bridge_adjust_segmented_data(skb); 734 return err; 735 } 736 737 static int 738 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) 739 { 740 struct sk_buff *nskb; 741 742 if (diff < 0) { 743 if (pskb_trim(e->skb, data_len)) 744 return -ENOMEM; 745 } else if (diff > 0) { 746 if (data_len > 0xFFFF) 747 return -EINVAL; 748 if (diff > skb_tailroom(e->skb)) { 749 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), 750 diff, GFP_ATOMIC); 751 if (!nskb) { 752 printk(KERN_WARNING "nf_queue: OOM " 753 "in mangle, dropping packet\n"); 754 return -ENOMEM; 755 } 756 kfree_skb(e->skb); 757 e->skb = nskb; 758 } 759 skb_put(e->skb, diff); 760 } 761 if (!skb_make_writable(e->skb, data_len)) 762 return -ENOMEM; 763 skb_copy_to_linear_data(e->skb, data, data_len); 764 e->skb->ip_summed = CHECKSUM_NONE; 765 return 0; 766 } 767 768 static int 769 nfqnl_set_mode(struct nfqnl_instance *queue, 770 unsigned char mode, unsigned int range) 771 { 772 int status = 0; 773 774 spin_lock_bh(&queue->lock); 775 switch (mode) { 776 case NFQNL_COPY_NONE: 777 case NFQNL_COPY_META: 778 queue->copy_mode = mode; 779 queue->copy_range = 0; 780 break; 781 782 case NFQNL_COPY_PACKET: 783 queue->copy_mode = mode; 784 if (range == 0 || range > NFQNL_MAX_COPY_RANGE) 785 queue->copy_range = NFQNL_MAX_COPY_RANGE; 786 else 787 queue->copy_range = range; 788 break; 789 790 default: 791 status = -EINVAL; 792 793 } 794 spin_unlock_bh(&queue->lock); 795 796 return status; 797 } 798 799 static int 800 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) 801 { 802 if (entry->state.in) 803 if (entry->state.in->ifindex == ifindex) 804 return 1; 805 if (entry->state.out) 806 if (entry->state.out->ifindex == ifindex) 807 return 1; 808 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 809 if (entry->skb->nf_bridge) { 810 int physinif, physoutif; 811 812 physinif = nf_bridge_get_physinif(entry->skb); 813 physoutif = nf_bridge_get_physoutif(entry->skb); 814 815 if (physinif == ifindex || physoutif == ifindex) 816 return 1; 817 } 818 #endif 819 return 0; 820 } 821 822 /* drop all packets with either indev or outdev == ifindex from all queue 823 * instances */ 824 static void 825 nfqnl_dev_drop(struct net *net, int ifindex) 826 { 827 int i; 828 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 829 830 rcu_read_lock(); 831 832 for (i = 0; i < INSTANCE_BUCKETS; i++) { 833 struct nfqnl_instance *inst; 834 struct hlist_head *head = &q->instance_table[i]; 835 836 hlist_for_each_entry_rcu(inst, head, hlist) 837 nfqnl_flush(inst, dev_cmp, ifindex); 838 } 839 840 rcu_read_unlock(); 841 } 842 843 static int 844 nfqnl_rcv_dev_event(struct notifier_block *this, 845 unsigned long event, void *ptr) 846 { 847 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 848 849 /* Drop any packets associated with the downed device */ 850 if (event == NETDEV_DOWN) 851 nfqnl_dev_drop(dev_net(dev), dev->ifindex); 852 return NOTIFY_DONE; 853 } 854 855 static struct notifier_block nfqnl_dev_notifier = { 856 .notifier_call = nfqnl_rcv_dev_event, 857 }; 858 859 static int nf_hook_cmp(struct nf_queue_entry *entry, unsigned long ops_ptr) 860 { 861 return entry->elem == (struct nf_hook_ops *)ops_ptr; 862 } 863 864 static void nfqnl_nf_hook_drop(struct net *net, struct nf_hook_ops *hook) 865 { 866 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 867 int i; 868 869 rcu_read_lock(); 870 for (i = 0; i < INSTANCE_BUCKETS; i++) { 871 struct nfqnl_instance *inst; 872 struct hlist_head *head = &q->instance_table[i]; 873 874 hlist_for_each_entry_rcu(inst, head, hlist) 875 nfqnl_flush(inst, nf_hook_cmp, (unsigned long)hook); 876 } 877 rcu_read_unlock(); 878 } 879 880 static int 881 nfqnl_rcv_nl_event(struct notifier_block *this, 882 unsigned long event, void *ptr) 883 { 884 struct netlink_notify *n = ptr; 885 struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); 886 887 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { 888 int i; 889 890 /* destroy all instances for this portid */ 891 spin_lock(&q->instances_lock); 892 for (i = 0; i < INSTANCE_BUCKETS; i++) { 893 struct hlist_node *t2; 894 struct nfqnl_instance *inst; 895 struct hlist_head *head = &q->instance_table[i]; 896 897 hlist_for_each_entry_safe(inst, t2, head, hlist) { 898 if (n->portid == inst->peer_portid) 899 __instance_destroy(inst); 900 } 901 } 902 spin_unlock(&q->instances_lock); 903 } 904 return NOTIFY_DONE; 905 } 906 907 static struct notifier_block nfqnl_rtnl_notifier = { 908 .notifier_call = nfqnl_rcv_nl_event, 909 }; 910 911 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { 912 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, 913 [NFQA_MARK] = { .type = NLA_U32 }, 914 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, 915 [NFQA_CT] = { .type = NLA_UNSPEC }, 916 [NFQA_EXP] = { .type = NLA_UNSPEC }, 917 }; 918 919 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { 920 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, 921 [NFQA_MARK] = { .type = NLA_U32 }, 922 }; 923 924 static struct nfqnl_instance * 925 verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid) 926 { 927 struct nfqnl_instance *queue; 928 929 queue = instance_lookup(q, queue_num); 930 if (!queue) 931 return ERR_PTR(-ENODEV); 932 933 if (queue->peer_portid != nlportid) 934 return ERR_PTR(-EPERM); 935 936 return queue; 937 } 938 939 static struct nfqnl_msg_verdict_hdr* 940 verdicthdr_get(const struct nlattr * const nfqa[]) 941 { 942 struct nfqnl_msg_verdict_hdr *vhdr; 943 unsigned int verdict; 944 945 if (!nfqa[NFQA_VERDICT_HDR]) 946 return NULL; 947 948 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); 949 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; 950 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) 951 return NULL; 952 return vhdr; 953 } 954 955 static int nfq_id_after(unsigned int id, unsigned int max) 956 { 957 return (int)(id - max) > 0; 958 } 959 960 static int 961 nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb, 962 const struct nlmsghdr *nlh, 963 const struct nlattr * const nfqa[]) 964 { 965 struct nfgenmsg *nfmsg = nlmsg_data(nlh); 966 struct nf_queue_entry *entry, *tmp; 967 unsigned int verdict, maxid; 968 struct nfqnl_msg_verdict_hdr *vhdr; 969 struct nfqnl_instance *queue; 970 LIST_HEAD(batch_list); 971 u16 queue_num = ntohs(nfmsg->res_id); 972 973 struct net *net = sock_net(ctnl); 974 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 975 976 queue = verdict_instance_lookup(q, queue_num, 977 NETLINK_CB(skb).portid); 978 if (IS_ERR(queue)) 979 return PTR_ERR(queue); 980 981 vhdr = verdicthdr_get(nfqa); 982 if (!vhdr) 983 return -EINVAL; 984 985 verdict = ntohl(vhdr->verdict); 986 maxid = ntohl(vhdr->id); 987 988 spin_lock_bh(&queue->lock); 989 990 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { 991 if (nfq_id_after(entry->id, maxid)) 992 break; 993 __dequeue_entry(queue, entry); 994 list_add_tail(&entry->list, &batch_list); 995 } 996 997 spin_unlock_bh(&queue->lock); 998 999 if (list_empty(&batch_list)) 1000 return -ENOENT; 1001 1002 list_for_each_entry_safe(entry, tmp, &batch_list, list) { 1003 if (nfqa[NFQA_MARK]) 1004 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); 1005 nf_reinject(entry, verdict); 1006 } 1007 return 0; 1008 } 1009 1010 static struct nf_conn *nfqnl_ct_parse(struct nfnl_ct_hook *nfnl_ct, 1011 const struct nlmsghdr *nlh, 1012 const struct nlattr * const nfqa[], 1013 struct nf_queue_entry *entry, 1014 enum ip_conntrack_info *ctinfo) 1015 { 1016 struct nf_conn *ct; 1017 1018 ct = nfnl_ct->get_ct(entry->skb, ctinfo); 1019 if (ct == NULL) 1020 return NULL; 1021 1022 if (nfnl_ct->parse(nfqa[NFQA_CT], ct) < 0) 1023 return NULL; 1024 1025 if (nfqa[NFQA_EXP]) 1026 nfnl_ct->attach_expect(nfqa[NFQA_EXP], ct, 1027 NETLINK_CB(entry->skb).portid, 1028 nlmsg_report(nlh)); 1029 return ct; 1030 } 1031 1032 static int 1033 nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, 1034 const struct nlmsghdr *nlh, 1035 const struct nlattr * const nfqa[]) 1036 { 1037 struct nfgenmsg *nfmsg = nlmsg_data(nlh); 1038 u_int16_t queue_num = ntohs(nfmsg->res_id); 1039 1040 struct nfqnl_msg_verdict_hdr *vhdr; 1041 struct nfqnl_instance *queue; 1042 unsigned int verdict; 1043 struct nf_queue_entry *entry; 1044 enum ip_conntrack_info uninitialized_var(ctinfo); 1045 struct nfnl_ct_hook *nfnl_ct; 1046 struct nf_conn *ct = NULL; 1047 1048 struct net *net = sock_net(ctnl); 1049 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1050 1051 queue = instance_lookup(q, queue_num); 1052 if (!queue) 1053 queue = verdict_instance_lookup(q, queue_num, 1054 NETLINK_CB(skb).portid); 1055 if (IS_ERR(queue)) 1056 return PTR_ERR(queue); 1057 1058 vhdr = verdicthdr_get(nfqa); 1059 if (!vhdr) 1060 return -EINVAL; 1061 1062 verdict = ntohl(vhdr->verdict); 1063 1064 entry = find_dequeue_entry(queue, ntohl(vhdr->id)); 1065 if (entry == NULL) 1066 return -ENOENT; 1067 1068 /* rcu lock already held from nfnl->call_rcu. */ 1069 nfnl_ct = rcu_dereference(nfnl_ct_hook); 1070 1071 if (nfqa[NFQA_CT]) { 1072 if (nfnl_ct != NULL) 1073 ct = nfqnl_ct_parse(nfnl_ct, nlh, nfqa, entry, &ctinfo); 1074 } 1075 1076 if (nfqa[NFQA_PAYLOAD]) { 1077 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); 1078 int diff = payload_len - entry->skb->len; 1079 1080 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), 1081 payload_len, entry, diff) < 0) 1082 verdict = NF_DROP; 1083 1084 if (ct && diff) 1085 nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff); 1086 } 1087 1088 if (nfqa[NFQA_MARK]) 1089 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); 1090 1091 nf_reinject(entry, verdict); 1092 return 0; 1093 } 1094 1095 static int 1096 nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, 1097 const struct nlmsghdr *nlh, 1098 const struct nlattr * const nfqa[]) 1099 { 1100 return -ENOTSUPP; 1101 } 1102 1103 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { 1104 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, 1105 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, 1106 }; 1107 1108 static const struct nf_queue_handler nfqh = { 1109 .outfn = &nfqnl_enqueue_packet, 1110 .nf_hook_drop = &nfqnl_nf_hook_drop, 1111 }; 1112 1113 static int 1114 nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, 1115 const struct nlmsghdr *nlh, 1116 const struct nlattr * const nfqa[]) 1117 { 1118 struct nfgenmsg *nfmsg = nlmsg_data(nlh); 1119 u_int16_t queue_num = ntohs(nfmsg->res_id); 1120 struct nfqnl_instance *queue; 1121 struct nfqnl_msg_config_cmd *cmd = NULL; 1122 struct net *net = sock_net(ctnl); 1123 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1124 int ret = 0; 1125 1126 if (nfqa[NFQA_CFG_CMD]) { 1127 cmd = nla_data(nfqa[NFQA_CFG_CMD]); 1128 1129 /* Obsolete commands without queue context */ 1130 switch (cmd->command) { 1131 case NFQNL_CFG_CMD_PF_BIND: return 0; 1132 case NFQNL_CFG_CMD_PF_UNBIND: return 0; 1133 } 1134 } 1135 1136 rcu_read_lock(); 1137 queue = instance_lookup(q, queue_num); 1138 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { 1139 ret = -EPERM; 1140 goto err_out_unlock; 1141 } 1142 1143 if (cmd != NULL) { 1144 switch (cmd->command) { 1145 case NFQNL_CFG_CMD_BIND: 1146 if (queue) { 1147 ret = -EBUSY; 1148 goto err_out_unlock; 1149 } 1150 queue = instance_create(q, queue_num, 1151 NETLINK_CB(skb).portid); 1152 if (IS_ERR(queue)) { 1153 ret = PTR_ERR(queue); 1154 goto err_out_unlock; 1155 } 1156 break; 1157 case NFQNL_CFG_CMD_UNBIND: 1158 if (!queue) { 1159 ret = -ENODEV; 1160 goto err_out_unlock; 1161 } 1162 instance_destroy(q, queue); 1163 break; 1164 case NFQNL_CFG_CMD_PF_BIND: 1165 case NFQNL_CFG_CMD_PF_UNBIND: 1166 break; 1167 default: 1168 ret = -ENOTSUPP; 1169 break; 1170 } 1171 } 1172 1173 if (nfqa[NFQA_CFG_PARAMS]) { 1174 struct nfqnl_msg_config_params *params; 1175 1176 if (!queue) { 1177 ret = -ENODEV; 1178 goto err_out_unlock; 1179 } 1180 params = nla_data(nfqa[NFQA_CFG_PARAMS]); 1181 nfqnl_set_mode(queue, params->copy_mode, 1182 ntohl(params->copy_range)); 1183 } 1184 1185 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { 1186 __be32 *queue_maxlen; 1187 1188 if (!queue) { 1189 ret = -ENODEV; 1190 goto err_out_unlock; 1191 } 1192 queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); 1193 spin_lock_bh(&queue->lock); 1194 queue->queue_maxlen = ntohl(*queue_maxlen); 1195 spin_unlock_bh(&queue->lock); 1196 } 1197 1198 if (nfqa[NFQA_CFG_FLAGS]) { 1199 __u32 flags, mask; 1200 1201 if (!queue) { 1202 ret = -ENODEV; 1203 goto err_out_unlock; 1204 } 1205 1206 if (!nfqa[NFQA_CFG_MASK]) { 1207 /* A mask is needed to specify which flags are being 1208 * changed. 1209 */ 1210 ret = -EINVAL; 1211 goto err_out_unlock; 1212 } 1213 1214 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); 1215 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); 1216 1217 if (flags >= NFQA_CFG_F_MAX) { 1218 ret = -EOPNOTSUPP; 1219 goto err_out_unlock; 1220 } 1221 #if !IS_ENABLED(CONFIG_NETWORK_SECMARK) 1222 if (flags & mask & NFQA_CFG_F_SECCTX) { 1223 ret = -EOPNOTSUPP; 1224 goto err_out_unlock; 1225 } 1226 #endif 1227 spin_lock_bh(&queue->lock); 1228 queue->flags &= ~mask; 1229 queue->flags |= flags & mask; 1230 spin_unlock_bh(&queue->lock); 1231 } 1232 1233 err_out_unlock: 1234 rcu_read_unlock(); 1235 return ret; 1236 } 1237 1238 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { 1239 [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, 1240 .attr_count = NFQA_MAX, }, 1241 [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, 1242 .attr_count = NFQA_MAX, 1243 .policy = nfqa_verdict_policy }, 1244 [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, 1245 .attr_count = NFQA_CFG_MAX, 1246 .policy = nfqa_cfg_policy }, 1247 [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, 1248 .attr_count = NFQA_MAX, 1249 .policy = nfqa_verdict_batch_policy }, 1250 }; 1251 1252 static const struct nfnetlink_subsystem nfqnl_subsys = { 1253 .name = "nf_queue", 1254 .subsys_id = NFNL_SUBSYS_QUEUE, 1255 .cb_count = NFQNL_MSG_MAX, 1256 .cb = nfqnl_cb, 1257 }; 1258 1259 #ifdef CONFIG_PROC_FS 1260 struct iter_state { 1261 struct seq_net_private p; 1262 unsigned int bucket; 1263 }; 1264 1265 static struct hlist_node *get_first(struct seq_file *seq) 1266 { 1267 struct iter_state *st = seq->private; 1268 struct net *net; 1269 struct nfnl_queue_net *q; 1270 1271 if (!st) 1272 return NULL; 1273 1274 net = seq_file_net(seq); 1275 q = nfnl_queue_pernet(net); 1276 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { 1277 if (!hlist_empty(&q->instance_table[st->bucket])) 1278 return q->instance_table[st->bucket].first; 1279 } 1280 return NULL; 1281 } 1282 1283 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) 1284 { 1285 struct iter_state *st = seq->private; 1286 struct net *net = seq_file_net(seq); 1287 1288 h = h->next; 1289 while (!h) { 1290 struct nfnl_queue_net *q; 1291 1292 if (++st->bucket >= INSTANCE_BUCKETS) 1293 return NULL; 1294 1295 q = nfnl_queue_pernet(net); 1296 h = q->instance_table[st->bucket].first; 1297 } 1298 return h; 1299 } 1300 1301 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) 1302 { 1303 struct hlist_node *head; 1304 head = get_first(seq); 1305 1306 if (head) 1307 while (pos && (head = get_next(seq, head))) 1308 pos--; 1309 return pos ? NULL : head; 1310 } 1311 1312 static void *seq_start(struct seq_file *s, loff_t *pos) 1313 __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) 1314 { 1315 spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); 1316 return get_idx(s, *pos); 1317 } 1318 1319 static void *seq_next(struct seq_file *s, void *v, loff_t *pos) 1320 { 1321 (*pos)++; 1322 return get_next(s, v); 1323 } 1324 1325 static void seq_stop(struct seq_file *s, void *v) 1326 __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) 1327 { 1328 spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); 1329 } 1330 1331 static int seq_show(struct seq_file *s, void *v) 1332 { 1333 const struct nfqnl_instance *inst = v; 1334 1335 seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n", 1336 inst->queue_num, 1337 inst->peer_portid, inst->queue_total, 1338 inst->copy_mode, inst->copy_range, 1339 inst->queue_dropped, inst->queue_user_dropped, 1340 inst->id_sequence, 1); 1341 return 0; 1342 } 1343 1344 static const struct seq_operations nfqnl_seq_ops = { 1345 .start = seq_start, 1346 .next = seq_next, 1347 .stop = seq_stop, 1348 .show = seq_show, 1349 }; 1350 1351 static int nfqnl_open(struct inode *inode, struct file *file) 1352 { 1353 return seq_open_net(inode, file, &nfqnl_seq_ops, 1354 sizeof(struct iter_state)); 1355 } 1356 1357 static const struct file_operations nfqnl_file_ops = { 1358 .owner = THIS_MODULE, 1359 .open = nfqnl_open, 1360 .read = seq_read, 1361 .llseek = seq_lseek, 1362 .release = seq_release_net, 1363 }; 1364 1365 #endif /* PROC_FS */ 1366 1367 static int __net_init nfnl_queue_net_init(struct net *net) 1368 { 1369 unsigned int i; 1370 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1371 1372 for (i = 0; i < INSTANCE_BUCKETS; i++) 1373 INIT_HLIST_HEAD(&q->instance_table[i]); 1374 1375 spin_lock_init(&q->instances_lock); 1376 1377 #ifdef CONFIG_PROC_FS 1378 if (!proc_create("nfnetlink_queue", 0440, 1379 net->nf.proc_netfilter, &nfqnl_file_ops)) 1380 return -ENOMEM; 1381 #endif 1382 return 0; 1383 } 1384 1385 static void __net_exit nfnl_queue_net_exit(struct net *net) 1386 { 1387 #ifdef CONFIG_PROC_FS 1388 remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); 1389 #endif 1390 } 1391 1392 static struct pernet_operations nfnl_queue_net_ops = { 1393 .init = nfnl_queue_net_init, 1394 .exit = nfnl_queue_net_exit, 1395 .id = &nfnl_queue_net_id, 1396 .size = sizeof(struct nfnl_queue_net), 1397 }; 1398 1399 static int __init nfnetlink_queue_init(void) 1400 { 1401 int status; 1402 1403 status = register_pernet_subsys(&nfnl_queue_net_ops); 1404 if (status < 0) { 1405 pr_err("nf_queue: failed to register pernet ops\n"); 1406 goto out; 1407 } 1408 1409 netlink_register_notifier(&nfqnl_rtnl_notifier); 1410 status = nfnetlink_subsys_register(&nfqnl_subsys); 1411 if (status < 0) { 1412 pr_err("nf_queue: failed to create netlink socket\n"); 1413 goto cleanup_netlink_notifier; 1414 } 1415 1416 register_netdevice_notifier(&nfqnl_dev_notifier); 1417 nf_register_queue_handler(&nfqh); 1418 return status; 1419 1420 cleanup_netlink_notifier: 1421 netlink_unregister_notifier(&nfqnl_rtnl_notifier); 1422 unregister_pernet_subsys(&nfnl_queue_net_ops); 1423 out: 1424 return status; 1425 } 1426 1427 static void __exit nfnetlink_queue_fini(void) 1428 { 1429 nf_unregister_queue_handler(); 1430 unregister_netdevice_notifier(&nfqnl_dev_notifier); 1431 nfnetlink_subsys_unregister(&nfqnl_subsys); 1432 netlink_unregister_notifier(&nfqnl_rtnl_notifier); 1433 unregister_pernet_subsys(&nfnl_queue_net_ops); 1434 1435 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1436 } 1437 1438 MODULE_DESCRIPTION("netfilter packet queue handler"); 1439 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); 1440 MODULE_LICENSE("GPL"); 1441 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); 1442 1443 module_init(nfnetlink_queue_init); 1444 module_exit(nfnetlink_queue_fini); 1445