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 <[email protected]> 6 * (C) 2007 by Patrick McHardy <[email protected]> 7 * 8 * Based on the old ipv4-only ip_queue.c: 9 * (C) 2000-2002 James Morris <[email protected]> 10 * (C) 2003-2005 Netfilter Core Team <[email protected]> 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; 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 break; 365 } 366 367 nfnl_ct = rcu_dereference(nfnl_ct_hook); 368 369 if (queue->flags & NFQA_CFG_F_CONNTRACK) { 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 = alloc_skb(size, GFP_ATOMIC); 389 if (!skb) { 390 skb_tx_error(entskb); 391 return NULL; 392 } 393 394 nlh = nlmsg_put(skb, 0, 0, 395 NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, 396 sizeof(struct nfgenmsg), 0); 397 if (!nlh) { 398 skb_tx_error(entskb); 399 kfree_skb(skb); 400 return NULL; 401 } 402 nfmsg = nlmsg_data(nlh); 403 nfmsg->nfgen_family = entry->state.pf; 404 nfmsg->version = NFNETLINK_V0; 405 nfmsg->res_id = htons(queue->queue_num); 406 407 nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); 408 pmsg = nla_data(nla); 409 pmsg->hw_protocol = entskb->protocol; 410 pmsg->hook = entry->state.hook; 411 *packet_id_ptr = &pmsg->packet_id; 412 413 indev = entry->state.in; 414 if (indev) { 415 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 416 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) 417 goto nla_put_failure; 418 #else 419 if (entry->state.pf == PF_BRIDGE) { 420 /* Case 1: indev is physical input device, we need to 421 * look for bridge group (when called from 422 * netfilter_bridge) */ 423 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, 424 htonl(indev->ifindex)) || 425 /* this is the bridge group "brX" */ 426 /* rcu_read_lock()ed by __nf_queue */ 427 nla_put_be32(skb, NFQA_IFINDEX_INDEV, 428 htonl(br_port_get_rcu(indev)->br->dev->ifindex))) 429 goto nla_put_failure; 430 } else { 431 int physinif; 432 433 /* Case 2: indev is bridge group, we need to look for 434 * physical device (when called from ipv4) */ 435 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, 436 htonl(indev->ifindex))) 437 goto nla_put_failure; 438 439 physinif = nf_bridge_get_physinif(entskb); 440 if (physinif && 441 nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, 442 htonl(physinif))) 443 goto nla_put_failure; 444 } 445 #endif 446 } 447 448 if (outdev) { 449 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 450 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) 451 goto nla_put_failure; 452 #else 453 if (entry->state.pf == PF_BRIDGE) { 454 /* Case 1: outdev is physical output device, we need to 455 * look for bridge group (when called from 456 * netfilter_bridge) */ 457 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, 458 htonl(outdev->ifindex)) || 459 /* this is the bridge group "brX" */ 460 /* rcu_read_lock()ed by __nf_queue */ 461 nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, 462 htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) 463 goto nla_put_failure; 464 } else { 465 int physoutif; 466 467 /* Case 2: outdev is bridge group, we need to look for 468 * physical output device (when called from ipv4) */ 469 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, 470 htonl(outdev->ifindex))) 471 goto nla_put_failure; 472 473 physoutif = nf_bridge_get_physoutif(entskb); 474 if (physoutif && 475 nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, 476 htonl(physoutif))) 477 goto nla_put_failure; 478 } 479 #endif 480 } 481 482 if (entskb->mark && 483 nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) 484 goto nla_put_failure; 485 486 if (indev && entskb->dev && 487 entskb->mac_header != entskb->network_header) { 488 struct nfqnl_msg_packet_hw phw; 489 int len; 490 491 memset(&phw, 0, sizeof(phw)); 492 len = dev_parse_header(entskb, phw.hw_addr); 493 if (len) { 494 phw.hw_addrlen = htons(len); 495 if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) 496 goto nla_put_failure; 497 } 498 } 499 500 if (entskb->tstamp.tv64) { 501 struct nfqnl_msg_packet_timestamp ts; 502 struct timespec64 kts = ktime_to_timespec64(skb->tstamp); 503 504 ts.sec = cpu_to_be64(kts.tv_sec); 505 ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC); 506 507 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) 508 goto nla_put_failure; 509 } 510 511 if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk && 512 nfqnl_put_sk_uidgid(skb, entskb->sk) < 0) 513 goto nla_put_failure; 514 515 if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata)) 516 goto nla_put_failure; 517 518 if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0) 519 goto nla_put_failure; 520 521 if (cap_len > data_len && 522 nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) 523 goto nla_put_failure; 524 525 if (nfqnl_put_packet_info(skb, entskb, csum_verify)) 526 goto nla_put_failure; 527 528 if (data_len) { 529 struct nlattr *nla; 530 531 if (skb_tailroom(skb) < sizeof(*nla) + hlen) 532 goto nla_put_failure; 533 534 nla = (struct nlattr *)skb_put(skb, sizeof(*nla)); 535 nla->nla_type = NFQA_PAYLOAD; 536 nla->nla_len = nla_attr_size(data_len); 537 538 if (skb_zerocopy(skb, entskb, data_len, hlen)) 539 goto nla_put_failure; 540 } 541 542 nlh->nlmsg_len = skb->len; 543 return skb; 544 545 nla_put_failure: 546 skb_tx_error(entskb); 547 kfree_skb(skb); 548 net_err_ratelimited("nf_queue: error creating packet message\n"); 549 return NULL; 550 } 551 552 static int 553 __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, 554 struct nf_queue_entry *entry) 555 { 556 struct sk_buff *nskb; 557 int err = -ENOBUFS; 558 __be32 *packet_id_ptr; 559 int failopen = 0; 560 561 nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr); 562 if (nskb == NULL) { 563 err = -ENOMEM; 564 goto err_out; 565 } 566 spin_lock_bh(&queue->lock); 567 568 if (queue->queue_total >= queue->queue_maxlen) { 569 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { 570 failopen = 1; 571 err = 0; 572 } else { 573 queue->queue_dropped++; 574 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", 575 queue->queue_total); 576 } 577 goto err_out_free_nskb; 578 } 579 entry->id = ++queue->id_sequence; 580 *packet_id_ptr = htonl(entry->id); 581 582 /* nfnetlink_unicast will either free the nskb or add it to a socket */ 583 err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT); 584 if (err < 0) { 585 queue->queue_user_dropped++; 586 goto err_out_unlock; 587 } 588 589 __enqueue_entry(queue, entry); 590 591 spin_unlock_bh(&queue->lock); 592 return 0; 593 594 err_out_free_nskb: 595 kfree_skb(nskb); 596 err_out_unlock: 597 spin_unlock_bh(&queue->lock); 598 if (failopen) 599 nf_reinject(entry, NF_ACCEPT); 600 err_out: 601 return err; 602 } 603 604 static struct nf_queue_entry * 605 nf_queue_entry_dup(struct nf_queue_entry *e) 606 { 607 struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); 608 if (entry) 609 nf_queue_entry_get_refs(entry); 610 return entry; 611 } 612 613 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 614 /* When called from bridge netfilter, skb->data must point to MAC header 615 * before calling skb_gso_segment(). Else, original MAC header is lost 616 * and segmented skbs will be sent to wrong destination. 617 */ 618 static void nf_bridge_adjust_skb_data(struct sk_buff *skb) 619 { 620 if (skb->nf_bridge) 621 __skb_push(skb, skb->network_header - skb->mac_header); 622 } 623 624 static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) 625 { 626 if (skb->nf_bridge) 627 __skb_pull(skb, skb->network_header - skb->mac_header); 628 } 629 #else 630 #define nf_bridge_adjust_skb_data(s) do {} while (0) 631 #define nf_bridge_adjust_segmented_data(s) do {} while (0) 632 #endif 633 634 static void free_entry(struct nf_queue_entry *entry) 635 { 636 nf_queue_entry_release_refs(entry); 637 kfree(entry); 638 } 639 640 static int 641 __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue, 642 struct sk_buff *skb, struct nf_queue_entry *entry) 643 { 644 int ret = -ENOMEM; 645 struct nf_queue_entry *entry_seg; 646 647 nf_bridge_adjust_segmented_data(skb); 648 649 if (skb->next == NULL) { /* last packet, no need to copy entry */ 650 struct sk_buff *gso_skb = entry->skb; 651 entry->skb = skb; 652 ret = __nfqnl_enqueue_packet(net, queue, entry); 653 if (ret) 654 entry->skb = gso_skb; 655 return ret; 656 } 657 658 skb->next = NULL; 659 660 entry_seg = nf_queue_entry_dup(entry); 661 if (entry_seg) { 662 entry_seg->skb = skb; 663 ret = __nfqnl_enqueue_packet(net, queue, entry_seg); 664 if (ret) 665 free_entry(entry_seg); 666 } 667 return ret; 668 } 669 670 static int 671 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) 672 { 673 unsigned int queued; 674 struct nfqnl_instance *queue; 675 struct sk_buff *skb, *segs; 676 int err = -ENOBUFS; 677 struct net *net = entry->state.net; 678 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 679 680 /* rcu_read_lock()ed by nf_hook_slow() */ 681 queue = instance_lookup(q, queuenum); 682 if (!queue) 683 return -ESRCH; 684 685 if (queue->copy_mode == NFQNL_COPY_NONE) 686 return -EINVAL; 687 688 skb = entry->skb; 689 690 switch (entry->state.pf) { 691 case NFPROTO_IPV4: 692 skb->protocol = htons(ETH_P_IP); 693 break; 694 case NFPROTO_IPV6: 695 skb->protocol = htons(ETH_P_IPV6); 696 break; 697 } 698 699 if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb)) 700 return __nfqnl_enqueue_packet(net, queue, entry); 701 702 nf_bridge_adjust_skb_data(skb); 703 segs = skb_gso_segment(skb, 0); 704 /* Does not use PTR_ERR to limit the number of error codes that can be 705 * returned by nf_queue. For instance, callers rely on -ESRCH to 706 * mean 'ignore this hook'. 707 */ 708 if (IS_ERR_OR_NULL(segs)) 709 goto out_err; 710 queued = 0; 711 err = 0; 712 do { 713 struct sk_buff *nskb = segs->next; 714 if (err == 0) 715 err = __nfqnl_enqueue_packet_gso(net, queue, 716 segs, entry); 717 if (err == 0) 718 queued++; 719 else 720 kfree_skb(segs); 721 segs = nskb; 722 } while (segs); 723 724 if (queued) { 725 if (err) /* some segments are already queued */ 726 free_entry(entry); 727 kfree_skb(skb); 728 return 0; 729 } 730 out_err: 731 nf_bridge_adjust_segmented_data(skb); 732 return err; 733 } 734 735 static int 736 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) 737 { 738 struct sk_buff *nskb; 739 740 if (diff < 0) { 741 if (pskb_trim(e->skb, data_len)) 742 return -ENOMEM; 743 } else if (diff > 0) { 744 if (data_len > 0xFFFF) 745 return -EINVAL; 746 if (diff > skb_tailroom(e->skb)) { 747 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), 748 diff, GFP_ATOMIC); 749 if (!nskb) { 750 printk(KERN_WARNING "nf_queue: OOM " 751 "in mangle, dropping packet\n"); 752 return -ENOMEM; 753 } 754 kfree_skb(e->skb); 755 e->skb = nskb; 756 } 757 skb_put(e->skb, diff); 758 } 759 if (!skb_make_writable(e->skb, data_len)) 760 return -ENOMEM; 761 skb_copy_to_linear_data(e->skb, data, data_len); 762 e->skb->ip_summed = CHECKSUM_NONE; 763 return 0; 764 } 765 766 static int 767 nfqnl_set_mode(struct nfqnl_instance *queue, 768 unsigned char mode, unsigned int range) 769 { 770 int status = 0; 771 772 spin_lock_bh(&queue->lock); 773 switch (mode) { 774 case NFQNL_COPY_NONE: 775 case NFQNL_COPY_META: 776 queue->copy_mode = mode; 777 queue->copy_range = 0; 778 break; 779 780 case NFQNL_COPY_PACKET: 781 queue->copy_mode = mode; 782 if (range == 0 || range > NFQNL_MAX_COPY_RANGE) 783 queue->copy_range = NFQNL_MAX_COPY_RANGE; 784 else 785 queue->copy_range = range; 786 break; 787 788 default: 789 status = -EINVAL; 790 791 } 792 spin_unlock_bh(&queue->lock); 793 794 return status; 795 } 796 797 static int 798 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) 799 { 800 if (entry->state.in) 801 if (entry->state.in->ifindex == ifindex) 802 return 1; 803 if (entry->state.out) 804 if (entry->state.out->ifindex == ifindex) 805 return 1; 806 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 807 if (entry->skb->nf_bridge) { 808 int physinif, physoutif; 809 810 physinif = nf_bridge_get_physinif(entry->skb); 811 physoutif = nf_bridge_get_physoutif(entry->skb); 812 813 if (physinif == ifindex || physoutif == ifindex) 814 return 1; 815 } 816 #endif 817 return 0; 818 } 819 820 /* drop all packets with either indev or outdev == ifindex from all queue 821 * instances */ 822 static void 823 nfqnl_dev_drop(struct net *net, int ifindex) 824 { 825 int i; 826 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 827 828 rcu_read_lock(); 829 830 for (i = 0; i < INSTANCE_BUCKETS; i++) { 831 struct nfqnl_instance *inst; 832 struct hlist_head *head = &q->instance_table[i]; 833 834 hlist_for_each_entry_rcu(inst, head, hlist) 835 nfqnl_flush(inst, dev_cmp, ifindex); 836 } 837 838 rcu_read_unlock(); 839 } 840 841 static int 842 nfqnl_rcv_dev_event(struct notifier_block *this, 843 unsigned long event, void *ptr) 844 { 845 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 846 847 /* Drop any packets associated with the downed device */ 848 if (event == NETDEV_DOWN) 849 nfqnl_dev_drop(dev_net(dev), dev->ifindex); 850 return NOTIFY_DONE; 851 } 852 853 static struct notifier_block nfqnl_dev_notifier = { 854 .notifier_call = nfqnl_rcv_dev_event, 855 }; 856 857 static int nf_hook_cmp(struct nf_queue_entry *entry, unsigned long ops_ptr) 858 { 859 return entry->elem == (struct nf_hook_ops *)ops_ptr; 860 } 861 862 static void nfqnl_nf_hook_drop(struct net *net, struct nf_hook_ops *hook) 863 { 864 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 865 int i; 866 867 rcu_read_lock(); 868 for (i = 0; i < INSTANCE_BUCKETS; i++) { 869 struct nfqnl_instance *inst; 870 struct hlist_head *head = &q->instance_table[i]; 871 872 hlist_for_each_entry_rcu(inst, head, hlist) 873 nfqnl_flush(inst, nf_hook_cmp, (unsigned long)hook); 874 } 875 rcu_read_unlock(); 876 } 877 878 static int 879 nfqnl_rcv_nl_event(struct notifier_block *this, 880 unsigned long event, void *ptr) 881 { 882 struct netlink_notify *n = ptr; 883 struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); 884 885 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { 886 int i; 887 888 /* destroy all instances for this portid */ 889 spin_lock(&q->instances_lock); 890 for (i = 0; i < INSTANCE_BUCKETS; i++) { 891 struct hlist_node *t2; 892 struct nfqnl_instance *inst; 893 struct hlist_head *head = &q->instance_table[i]; 894 895 hlist_for_each_entry_safe(inst, t2, head, hlist) { 896 if (n->portid == inst->peer_portid) 897 __instance_destroy(inst); 898 } 899 } 900 spin_unlock(&q->instances_lock); 901 } 902 return NOTIFY_DONE; 903 } 904 905 static struct notifier_block nfqnl_rtnl_notifier = { 906 .notifier_call = nfqnl_rcv_nl_event, 907 }; 908 909 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { 910 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, 911 [NFQA_MARK] = { .type = NLA_U32 }, 912 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, 913 [NFQA_CT] = { .type = NLA_UNSPEC }, 914 [NFQA_EXP] = { .type = NLA_UNSPEC }, 915 }; 916 917 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { 918 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, 919 [NFQA_MARK] = { .type = NLA_U32 }, 920 }; 921 922 static struct nfqnl_instance * 923 verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid) 924 { 925 struct nfqnl_instance *queue; 926 927 queue = instance_lookup(q, queue_num); 928 if (!queue) 929 return ERR_PTR(-ENODEV); 930 931 if (queue->peer_portid != nlportid) 932 return ERR_PTR(-EPERM); 933 934 return queue; 935 } 936 937 static struct nfqnl_msg_verdict_hdr* 938 verdicthdr_get(const struct nlattr * const nfqa[]) 939 { 940 struct nfqnl_msg_verdict_hdr *vhdr; 941 unsigned int verdict; 942 943 if (!nfqa[NFQA_VERDICT_HDR]) 944 return NULL; 945 946 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); 947 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; 948 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) 949 return NULL; 950 return vhdr; 951 } 952 953 static int nfq_id_after(unsigned int id, unsigned int max) 954 { 955 return (int)(id - max) > 0; 956 } 957 958 static int nfqnl_recv_verdict_batch(struct net *net, struct sock *ctnl, 959 struct sk_buff *skb, 960 const struct nlmsghdr *nlh, 961 const struct nlattr * const nfqa[]) 962 { 963 struct nfgenmsg *nfmsg = nlmsg_data(nlh); 964 struct nf_queue_entry *entry, *tmp; 965 unsigned int verdict, maxid; 966 struct nfqnl_msg_verdict_hdr *vhdr; 967 struct nfqnl_instance *queue; 968 LIST_HEAD(batch_list); 969 u16 queue_num = ntohs(nfmsg->res_id); 970 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 971 972 queue = verdict_instance_lookup(q, queue_num, 973 NETLINK_CB(skb).portid); 974 if (IS_ERR(queue)) 975 return PTR_ERR(queue); 976 977 vhdr = verdicthdr_get(nfqa); 978 if (!vhdr) 979 return -EINVAL; 980 981 verdict = ntohl(vhdr->verdict); 982 maxid = ntohl(vhdr->id); 983 984 spin_lock_bh(&queue->lock); 985 986 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { 987 if (nfq_id_after(entry->id, maxid)) 988 break; 989 __dequeue_entry(queue, entry); 990 list_add_tail(&entry->list, &batch_list); 991 } 992 993 spin_unlock_bh(&queue->lock); 994 995 if (list_empty(&batch_list)) 996 return -ENOENT; 997 998 list_for_each_entry_safe(entry, tmp, &batch_list, list) { 999 if (nfqa[NFQA_MARK]) 1000 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); 1001 nf_reinject(entry, verdict); 1002 } 1003 return 0; 1004 } 1005 1006 static struct nf_conn *nfqnl_ct_parse(struct nfnl_ct_hook *nfnl_ct, 1007 const struct nlmsghdr *nlh, 1008 const struct nlattr * const nfqa[], 1009 struct nf_queue_entry *entry, 1010 enum ip_conntrack_info *ctinfo) 1011 { 1012 struct nf_conn *ct; 1013 1014 ct = nfnl_ct->get_ct(entry->skb, ctinfo); 1015 if (ct == NULL) 1016 return NULL; 1017 1018 if (nfnl_ct->parse(nfqa[NFQA_CT], ct) < 0) 1019 return NULL; 1020 1021 if (nfqa[NFQA_EXP]) 1022 nfnl_ct->attach_expect(nfqa[NFQA_EXP], ct, 1023 NETLINK_CB(entry->skb).portid, 1024 nlmsg_report(nlh)); 1025 return ct; 1026 } 1027 1028 static int nfqnl_recv_verdict(struct net *net, struct sock *ctnl, 1029 struct sk_buff *skb, 1030 const struct nlmsghdr *nlh, 1031 const struct nlattr * const nfqa[]) 1032 { 1033 struct nfgenmsg *nfmsg = nlmsg_data(nlh); 1034 u_int16_t queue_num = ntohs(nfmsg->res_id); 1035 struct nfqnl_msg_verdict_hdr *vhdr; 1036 struct nfqnl_instance *queue; 1037 unsigned int verdict; 1038 struct nf_queue_entry *entry; 1039 enum ip_conntrack_info uninitialized_var(ctinfo); 1040 struct nfnl_ct_hook *nfnl_ct; 1041 struct nf_conn *ct = NULL; 1042 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1043 1044 queue = instance_lookup(q, queue_num); 1045 if (!queue) 1046 queue = verdict_instance_lookup(q, queue_num, 1047 NETLINK_CB(skb).portid); 1048 if (IS_ERR(queue)) 1049 return PTR_ERR(queue); 1050 1051 vhdr = verdicthdr_get(nfqa); 1052 if (!vhdr) 1053 return -EINVAL; 1054 1055 verdict = ntohl(vhdr->verdict); 1056 1057 entry = find_dequeue_entry(queue, ntohl(vhdr->id)); 1058 if (entry == NULL) 1059 return -ENOENT; 1060 1061 /* rcu lock already held from nfnl->call_rcu. */ 1062 nfnl_ct = rcu_dereference(nfnl_ct_hook); 1063 1064 if (nfqa[NFQA_CT]) { 1065 if (nfnl_ct != NULL) 1066 ct = nfqnl_ct_parse(nfnl_ct, nlh, nfqa, entry, &ctinfo); 1067 } 1068 1069 if (nfqa[NFQA_PAYLOAD]) { 1070 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); 1071 int diff = payload_len - entry->skb->len; 1072 1073 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), 1074 payload_len, entry, diff) < 0) 1075 verdict = NF_DROP; 1076 1077 if (ct && diff) 1078 nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff); 1079 } 1080 1081 if (nfqa[NFQA_MARK]) 1082 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); 1083 1084 nf_reinject(entry, verdict); 1085 return 0; 1086 } 1087 1088 static int nfqnl_recv_unsupp(struct net *net, struct sock *ctnl, 1089 struct sk_buff *skb, const struct nlmsghdr *nlh, 1090 const struct nlattr * const nfqa[]) 1091 { 1092 return -ENOTSUPP; 1093 } 1094 1095 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { 1096 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, 1097 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, 1098 }; 1099 1100 static const struct nf_queue_handler nfqh = { 1101 .outfn = &nfqnl_enqueue_packet, 1102 .nf_hook_drop = &nfqnl_nf_hook_drop, 1103 }; 1104 1105 static int nfqnl_recv_config(struct net *net, struct sock *ctnl, 1106 struct sk_buff *skb, const struct nlmsghdr *nlh, 1107 const struct nlattr * const nfqa[]) 1108 { 1109 struct nfgenmsg *nfmsg = nlmsg_data(nlh); 1110 u_int16_t queue_num = ntohs(nfmsg->res_id); 1111 struct nfqnl_instance *queue; 1112 struct nfqnl_msg_config_cmd *cmd = NULL; 1113 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1114 __u32 flags = 0, mask = 0; 1115 int ret = 0; 1116 1117 if (nfqa[NFQA_CFG_CMD]) { 1118 cmd = nla_data(nfqa[NFQA_CFG_CMD]); 1119 1120 /* Obsolete commands without queue context */ 1121 switch (cmd->command) { 1122 case NFQNL_CFG_CMD_PF_BIND: return 0; 1123 case NFQNL_CFG_CMD_PF_UNBIND: return 0; 1124 } 1125 } 1126 1127 /* Check if we support these flags in first place, dependencies should 1128 * be there too not to break atomicity. 1129 */ 1130 if (nfqa[NFQA_CFG_FLAGS]) { 1131 if (!nfqa[NFQA_CFG_MASK]) { 1132 /* A mask is needed to specify which flags are being 1133 * changed. 1134 */ 1135 return -EINVAL; 1136 } 1137 1138 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); 1139 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); 1140 1141 if (flags >= NFQA_CFG_F_MAX) 1142 return -EOPNOTSUPP; 1143 1144 #if !IS_ENABLED(CONFIG_NETWORK_SECMARK) 1145 if (flags & mask & NFQA_CFG_F_SECCTX) 1146 return -EOPNOTSUPP; 1147 #endif 1148 if ((flags & mask & NFQA_CFG_F_CONNTRACK) && 1149 !rcu_access_pointer(nfnl_ct_hook)) { 1150 #ifdef CONFIG_MODULES 1151 nfnl_unlock(NFNL_SUBSYS_QUEUE); 1152 request_module("ip_conntrack_netlink"); 1153 nfnl_lock(NFNL_SUBSYS_QUEUE); 1154 if (rcu_access_pointer(nfnl_ct_hook)) 1155 return -EAGAIN; 1156 #endif 1157 return -EOPNOTSUPP; 1158 } 1159 } 1160 1161 rcu_read_lock(); 1162 queue = instance_lookup(q, queue_num); 1163 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { 1164 ret = -EPERM; 1165 goto err_out_unlock; 1166 } 1167 1168 if (cmd != NULL) { 1169 switch (cmd->command) { 1170 case NFQNL_CFG_CMD_BIND: 1171 if (queue) { 1172 ret = -EBUSY; 1173 goto err_out_unlock; 1174 } 1175 queue = instance_create(q, queue_num, 1176 NETLINK_CB(skb).portid); 1177 if (IS_ERR(queue)) { 1178 ret = PTR_ERR(queue); 1179 goto err_out_unlock; 1180 } 1181 break; 1182 case NFQNL_CFG_CMD_UNBIND: 1183 if (!queue) { 1184 ret = -ENODEV; 1185 goto err_out_unlock; 1186 } 1187 instance_destroy(q, queue); 1188 goto err_out_unlock; 1189 case NFQNL_CFG_CMD_PF_BIND: 1190 case NFQNL_CFG_CMD_PF_UNBIND: 1191 break; 1192 default: 1193 ret = -ENOTSUPP; 1194 goto err_out_unlock; 1195 } 1196 } 1197 1198 if (!queue) { 1199 ret = -ENODEV; 1200 goto err_out_unlock; 1201 } 1202 1203 if (nfqa[NFQA_CFG_PARAMS]) { 1204 struct nfqnl_msg_config_params *params = 1205 nla_data(nfqa[NFQA_CFG_PARAMS]); 1206 1207 nfqnl_set_mode(queue, params->copy_mode, 1208 ntohl(params->copy_range)); 1209 } 1210 1211 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { 1212 __be32 *queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); 1213 1214 spin_lock_bh(&queue->lock); 1215 queue->queue_maxlen = ntohl(*queue_maxlen); 1216 spin_unlock_bh(&queue->lock); 1217 } 1218 1219 if (nfqa[NFQA_CFG_FLAGS]) { 1220 spin_lock_bh(&queue->lock); 1221 queue->flags &= ~mask; 1222 queue->flags |= flags & mask; 1223 spin_unlock_bh(&queue->lock); 1224 } 1225 1226 err_out_unlock: 1227 rcu_read_unlock(); 1228 return ret; 1229 } 1230 1231 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { 1232 [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, 1233 .attr_count = NFQA_MAX, }, 1234 [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, 1235 .attr_count = NFQA_MAX, 1236 .policy = nfqa_verdict_policy }, 1237 [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, 1238 .attr_count = NFQA_CFG_MAX, 1239 .policy = nfqa_cfg_policy }, 1240 [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, 1241 .attr_count = NFQA_MAX, 1242 .policy = nfqa_verdict_batch_policy }, 1243 }; 1244 1245 static const struct nfnetlink_subsystem nfqnl_subsys = { 1246 .name = "nf_queue", 1247 .subsys_id = NFNL_SUBSYS_QUEUE, 1248 .cb_count = NFQNL_MSG_MAX, 1249 .cb = nfqnl_cb, 1250 }; 1251 1252 #ifdef CONFIG_PROC_FS 1253 struct iter_state { 1254 struct seq_net_private p; 1255 unsigned int bucket; 1256 }; 1257 1258 static struct hlist_node *get_first(struct seq_file *seq) 1259 { 1260 struct iter_state *st = seq->private; 1261 struct net *net; 1262 struct nfnl_queue_net *q; 1263 1264 if (!st) 1265 return NULL; 1266 1267 net = seq_file_net(seq); 1268 q = nfnl_queue_pernet(net); 1269 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { 1270 if (!hlist_empty(&q->instance_table[st->bucket])) 1271 return q->instance_table[st->bucket].first; 1272 } 1273 return NULL; 1274 } 1275 1276 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) 1277 { 1278 struct iter_state *st = seq->private; 1279 struct net *net = seq_file_net(seq); 1280 1281 h = h->next; 1282 while (!h) { 1283 struct nfnl_queue_net *q; 1284 1285 if (++st->bucket >= INSTANCE_BUCKETS) 1286 return NULL; 1287 1288 q = nfnl_queue_pernet(net); 1289 h = q->instance_table[st->bucket].first; 1290 } 1291 return h; 1292 } 1293 1294 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) 1295 { 1296 struct hlist_node *head; 1297 head = get_first(seq); 1298 1299 if (head) 1300 while (pos && (head = get_next(seq, head))) 1301 pos--; 1302 return pos ? NULL : head; 1303 } 1304 1305 static void *seq_start(struct seq_file *s, loff_t *pos) 1306 __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) 1307 { 1308 spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); 1309 return get_idx(s, *pos); 1310 } 1311 1312 static void *seq_next(struct seq_file *s, void *v, loff_t *pos) 1313 { 1314 (*pos)++; 1315 return get_next(s, v); 1316 } 1317 1318 static void seq_stop(struct seq_file *s, void *v) 1319 __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) 1320 { 1321 spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); 1322 } 1323 1324 static int seq_show(struct seq_file *s, void *v) 1325 { 1326 const struct nfqnl_instance *inst = v; 1327 1328 seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n", 1329 inst->queue_num, 1330 inst->peer_portid, inst->queue_total, 1331 inst->copy_mode, inst->copy_range, 1332 inst->queue_dropped, inst->queue_user_dropped, 1333 inst->id_sequence, 1); 1334 return 0; 1335 } 1336 1337 static const struct seq_operations nfqnl_seq_ops = { 1338 .start = seq_start, 1339 .next = seq_next, 1340 .stop = seq_stop, 1341 .show = seq_show, 1342 }; 1343 1344 static int nfqnl_open(struct inode *inode, struct file *file) 1345 { 1346 return seq_open_net(inode, file, &nfqnl_seq_ops, 1347 sizeof(struct iter_state)); 1348 } 1349 1350 static const struct file_operations nfqnl_file_ops = { 1351 .owner = THIS_MODULE, 1352 .open = nfqnl_open, 1353 .read = seq_read, 1354 .llseek = seq_lseek, 1355 .release = seq_release_net, 1356 }; 1357 1358 #endif /* PROC_FS */ 1359 1360 static int __net_init nfnl_queue_net_init(struct net *net) 1361 { 1362 unsigned int i; 1363 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1364 1365 for (i = 0; i < INSTANCE_BUCKETS; i++) 1366 INIT_HLIST_HEAD(&q->instance_table[i]); 1367 1368 spin_lock_init(&q->instances_lock); 1369 1370 #ifdef CONFIG_PROC_FS 1371 if (!proc_create("nfnetlink_queue", 0440, 1372 net->nf.proc_netfilter, &nfqnl_file_ops)) 1373 return -ENOMEM; 1374 #endif 1375 return 0; 1376 } 1377 1378 static void __net_exit nfnl_queue_net_exit(struct net *net) 1379 { 1380 #ifdef CONFIG_PROC_FS 1381 remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); 1382 #endif 1383 } 1384 1385 static struct pernet_operations nfnl_queue_net_ops = { 1386 .init = nfnl_queue_net_init, 1387 .exit = nfnl_queue_net_exit, 1388 .id = &nfnl_queue_net_id, 1389 .size = sizeof(struct nfnl_queue_net), 1390 }; 1391 1392 static int __init nfnetlink_queue_init(void) 1393 { 1394 int status; 1395 1396 status = register_pernet_subsys(&nfnl_queue_net_ops); 1397 if (status < 0) { 1398 pr_err("nf_queue: failed to register pernet ops\n"); 1399 goto out; 1400 } 1401 1402 netlink_register_notifier(&nfqnl_rtnl_notifier); 1403 status = nfnetlink_subsys_register(&nfqnl_subsys); 1404 if (status < 0) { 1405 pr_err("nf_queue: failed to create netlink socket\n"); 1406 goto cleanup_netlink_notifier; 1407 } 1408 1409 register_netdevice_notifier(&nfqnl_dev_notifier); 1410 nf_register_queue_handler(&nfqh); 1411 return status; 1412 1413 cleanup_netlink_notifier: 1414 netlink_unregister_notifier(&nfqnl_rtnl_notifier); 1415 unregister_pernet_subsys(&nfnl_queue_net_ops); 1416 out: 1417 return status; 1418 } 1419 1420 static void __exit nfnetlink_queue_fini(void) 1421 { 1422 nf_unregister_queue_handler(); 1423 unregister_netdevice_notifier(&nfqnl_dev_notifier); 1424 nfnetlink_subsys_unregister(&nfqnl_subsys); 1425 netlink_unregister_notifier(&nfqnl_rtnl_notifier); 1426 unregister_pernet_subsys(&nfnl_queue_net_ops); 1427 1428 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1429 } 1430 1431 MODULE_DESCRIPTION("netfilter packet queue handler"); 1432 MODULE_AUTHOR("Harald Welte <[email protected]>"); 1433 MODULE_LICENSE("GPL"); 1434 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); 1435 1436 module_init(nfnetlink_queue_init); 1437 module_exit(nfnetlink_queue_fini); 1438