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 u32 nfqnl_get_bridge_size(struct nf_queue_entry *entry) 299 { 300 struct sk_buff *entskb = entry->skb; 301 u32 nlalen = 0; 302 303 if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb)) 304 return 0; 305 306 if (skb_vlan_tag_present(entskb)) 307 nlalen += nla_total_size(nla_total_size(sizeof(__be16)) + 308 nla_total_size(sizeof(__be16))); 309 310 if (entskb->network_header > entskb->mac_header) 311 nlalen += nla_total_size((entskb->network_header - 312 entskb->mac_header)); 313 314 return nlalen; 315 } 316 317 static int nfqnl_put_bridge(struct nf_queue_entry *entry, struct sk_buff *skb) 318 { 319 struct sk_buff *entskb = entry->skb; 320 321 if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb)) 322 return 0; 323 324 if (skb_vlan_tag_present(entskb)) { 325 struct nlattr *nest; 326 327 nest = nla_nest_start(skb, NFQA_VLAN | NLA_F_NESTED); 328 if (!nest) 329 goto nla_put_failure; 330 331 if (nla_put_be16(skb, NFQA_VLAN_TCI, htons(entskb->vlan_tci)) || 332 nla_put_be16(skb, NFQA_VLAN_PROTO, entskb->vlan_proto)) 333 goto nla_put_failure; 334 335 nla_nest_end(skb, nest); 336 } 337 338 if (entskb->mac_header < entskb->network_header) { 339 int len = (int)(entskb->network_header - entskb->mac_header); 340 341 if (nla_put(skb, NFQA_L2HDR, len, skb_mac_header(entskb))) 342 goto nla_put_failure; 343 } 344 345 return 0; 346 347 nla_put_failure: 348 return -1; 349 } 350 351 static struct sk_buff * 352 nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, 353 struct nf_queue_entry *entry, 354 __be32 **packet_id_ptr) 355 { 356 size_t size; 357 size_t data_len = 0, cap_len = 0; 358 unsigned int hlen = 0; 359 struct sk_buff *skb; 360 struct nlattr *nla; 361 struct nfqnl_msg_packet_hdr *pmsg; 362 struct nlmsghdr *nlh; 363 struct nfgenmsg *nfmsg; 364 struct sk_buff *entskb = entry->skb; 365 struct net_device *indev; 366 struct net_device *outdev; 367 struct nf_conn *ct = NULL; 368 enum ip_conntrack_info uninitialized_var(ctinfo); 369 struct nfnl_ct_hook *nfnl_ct; 370 bool csum_verify; 371 char *secdata = NULL; 372 u32 seclen = 0; 373 374 size = nlmsg_total_size(sizeof(struct nfgenmsg)) 375 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) 376 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 377 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 378 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 379 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 380 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 381 #endif 382 + nla_total_size(sizeof(u_int32_t)) /* mark */ 383 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) 384 + nla_total_size(sizeof(u_int32_t)) /* skbinfo */ 385 + nla_total_size(sizeof(u_int32_t)); /* cap_len */ 386 387 if (entskb->tstamp.tv64) 388 size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); 389 390 size += nfqnl_get_bridge_size(entry); 391 392 if (entry->state.hook <= NF_INET_FORWARD || 393 (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL)) 394 csum_verify = !skb_csum_unnecessary(entskb); 395 else 396 csum_verify = false; 397 398 outdev = entry->state.out; 399 400 switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) { 401 case NFQNL_COPY_META: 402 case NFQNL_COPY_NONE: 403 break; 404 405 case NFQNL_COPY_PACKET: 406 if (!(queue->flags & NFQA_CFG_F_GSO) && 407 entskb->ip_summed == CHECKSUM_PARTIAL && 408 skb_checksum_help(entskb)) 409 return NULL; 410 411 data_len = ACCESS_ONCE(queue->copy_range); 412 if (data_len > entskb->len) 413 data_len = entskb->len; 414 415 hlen = skb_zerocopy_headlen(entskb); 416 hlen = min_t(unsigned int, hlen, data_len); 417 size += sizeof(struct nlattr) + hlen; 418 cap_len = entskb->len; 419 break; 420 } 421 422 nfnl_ct = rcu_dereference(nfnl_ct_hook); 423 424 if (queue->flags & NFQA_CFG_F_CONNTRACK) { 425 if (nfnl_ct != NULL) { 426 ct = nfnl_ct->get_ct(entskb, &ctinfo); 427 if (ct != NULL) 428 size += nfnl_ct->build_size(ct); 429 } 430 } 431 432 if (queue->flags & NFQA_CFG_F_UID_GID) { 433 size += (nla_total_size(sizeof(u_int32_t)) /* uid */ 434 + nla_total_size(sizeof(u_int32_t))); /* gid */ 435 } 436 437 if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) { 438 seclen = nfqnl_get_sk_secctx(entskb, &secdata); 439 if (seclen) 440 size += nla_total_size(seclen); 441 } 442 443 skb = alloc_skb(size, GFP_ATOMIC); 444 if (!skb) { 445 skb_tx_error(entskb); 446 return NULL; 447 } 448 449 nlh = nlmsg_put(skb, 0, 0, 450 NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, 451 sizeof(struct nfgenmsg), 0); 452 if (!nlh) { 453 skb_tx_error(entskb); 454 kfree_skb(skb); 455 return NULL; 456 } 457 nfmsg = nlmsg_data(nlh); 458 nfmsg->nfgen_family = entry->state.pf; 459 nfmsg->version = NFNETLINK_V0; 460 nfmsg->res_id = htons(queue->queue_num); 461 462 nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); 463 pmsg = nla_data(nla); 464 pmsg->hw_protocol = entskb->protocol; 465 pmsg->hook = entry->state.hook; 466 *packet_id_ptr = &pmsg->packet_id; 467 468 indev = entry->state.in; 469 if (indev) { 470 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 471 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) 472 goto nla_put_failure; 473 #else 474 if (entry->state.pf == PF_BRIDGE) { 475 /* Case 1: indev is physical input device, we need to 476 * look for bridge group (when called from 477 * netfilter_bridge) */ 478 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, 479 htonl(indev->ifindex)) || 480 /* this is the bridge group "brX" */ 481 /* rcu_read_lock()ed by __nf_queue */ 482 nla_put_be32(skb, NFQA_IFINDEX_INDEV, 483 htonl(br_port_get_rcu(indev)->br->dev->ifindex))) 484 goto nla_put_failure; 485 } else { 486 int physinif; 487 488 /* Case 2: indev is bridge group, we need to look for 489 * physical device (when called from ipv4) */ 490 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, 491 htonl(indev->ifindex))) 492 goto nla_put_failure; 493 494 physinif = nf_bridge_get_physinif(entskb); 495 if (physinif && 496 nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, 497 htonl(physinif))) 498 goto nla_put_failure; 499 } 500 #endif 501 } 502 503 if (outdev) { 504 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 505 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) 506 goto nla_put_failure; 507 #else 508 if (entry->state.pf == PF_BRIDGE) { 509 /* Case 1: outdev is physical output device, we need to 510 * look for bridge group (when called from 511 * netfilter_bridge) */ 512 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, 513 htonl(outdev->ifindex)) || 514 /* this is the bridge group "brX" */ 515 /* rcu_read_lock()ed by __nf_queue */ 516 nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, 517 htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) 518 goto nla_put_failure; 519 } else { 520 int physoutif; 521 522 /* Case 2: outdev is bridge group, we need to look for 523 * physical output device (when called from ipv4) */ 524 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, 525 htonl(outdev->ifindex))) 526 goto nla_put_failure; 527 528 physoutif = nf_bridge_get_physoutif(entskb); 529 if (physoutif && 530 nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, 531 htonl(physoutif))) 532 goto nla_put_failure; 533 } 534 #endif 535 } 536 537 if (entskb->mark && 538 nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) 539 goto nla_put_failure; 540 541 if (indev && entskb->dev && 542 entskb->mac_header != entskb->network_header) { 543 struct nfqnl_msg_packet_hw phw; 544 int len; 545 546 memset(&phw, 0, sizeof(phw)); 547 len = dev_parse_header(entskb, phw.hw_addr); 548 if (len) { 549 phw.hw_addrlen = htons(len); 550 if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) 551 goto nla_put_failure; 552 } 553 } 554 555 if (nfqnl_put_bridge(entry, skb) < 0) 556 goto nla_put_failure; 557 558 if (entskb->tstamp.tv64) { 559 struct nfqnl_msg_packet_timestamp ts; 560 struct timespec64 kts = ktime_to_timespec64(entskb->tstamp); 561 562 ts.sec = cpu_to_be64(kts.tv_sec); 563 ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC); 564 565 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) 566 goto nla_put_failure; 567 } 568 569 if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk && 570 nfqnl_put_sk_uidgid(skb, entskb->sk) < 0) 571 goto nla_put_failure; 572 573 if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata)) 574 goto nla_put_failure; 575 576 if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0) 577 goto nla_put_failure; 578 579 if (cap_len > data_len && 580 nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) 581 goto nla_put_failure; 582 583 if (nfqnl_put_packet_info(skb, entskb, csum_verify)) 584 goto nla_put_failure; 585 586 if (data_len) { 587 struct nlattr *nla; 588 589 if (skb_tailroom(skb) < sizeof(*nla) + hlen) 590 goto nla_put_failure; 591 592 nla = (struct nlattr *)skb_put(skb, sizeof(*nla)); 593 nla->nla_type = NFQA_PAYLOAD; 594 nla->nla_len = nla_attr_size(data_len); 595 596 if (skb_zerocopy(skb, entskb, data_len, hlen)) 597 goto nla_put_failure; 598 } 599 600 nlh->nlmsg_len = skb->len; 601 return skb; 602 603 nla_put_failure: 604 skb_tx_error(entskb); 605 kfree_skb(skb); 606 net_err_ratelimited("nf_queue: error creating packet message\n"); 607 return NULL; 608 } 609 610 static int 611 __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, 612 struct nf_queue_entry *entry) 613 { 614 struct sk_buff *nskb; 615 int err = -ENOBUFS; 616 __be32 *packet_id_ptr; 617 int failopen = 0; 618 619 nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr); 620 if (nskb == NULL) { 621 err = -ENOMEM; 622 goto err_out; 623 } 624 spin_lock_bh(&queue->lock); 625 626 if (queue->queue_total >= queue->queue_maxlen) { 627 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { 628 failopen = 1; 629 err = 0; 630 } else { 631 queue->queue_dropped++; 632 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", 633 queue->queue_total); 634 } 635 goto err_out_free_nskb; 636 } 637 entry->id = ++queue->id_sequence; 638 *packet_id_ptr = htonl(entry->id); 639 640 /* nfnetlink_unicast will either free the nskb or add it to a socket */ 641 err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT); 642 if (err < 0) { 643 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { 644 failopen = 1; 645 err = 0; 646 } else { 647 queue->queue_user_dropped++; 648 } 649 goto err_out_unlock; 650 } 651 652 __enqueue_entry(queue, entry); 653 654 spin_unlock_bh(&queue->lock); 655 return 0; 656 657 err_out_free_nskb: 658 kfree_skb(nskb); 659 err_out_unlock: 660 spin_unlock_bh(&queue->lock); 661 if (failopen) 662 nf_reinject(entry, NF_ACCEPT); 663 err_out: 664 return err; 665 } 666 667 static struct nf_queue_entry * 668 nf_queue_entry_dup(struct nf_queue_entry *e) 669 { 670 struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); 671 if (entry) 672 nf_queue_entry_get_refs(entry); 673 return entry; 674 } 675 676 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 677 /* When called from bridge netfilter, skb->data must point to MAC header 678 * before calling skb_gso_segment(). Else, original MAC header is lost 679 * and segmented skbs will be sent to wrong destination. 680 */ 681 static void nf_bridge_adjust_skb_data(struct sk_buff *skb) 682 { 683 if (skb->nf_bridge) 684 __skb_push(skb, skb->network_header - skb->mac_header); 685 } 686 687 static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) 688 { 689 if (skb->nf_bridge) 690 __skb_pull(skb, skb->network_header - skb->mac_header); 691 } 692 #else 693 #define nf_bridge_adjust_skb_data(s) do {} while (0) 694 #define nf_bridge_adjust_segmented_data(s) do {} while (0) 695 #endif 696 697 static void free_entry(struct nf_queue_entry *entry) 698 { 699 nf_queue_entry_release_refs(entry); 700 kfree(entry); 701 } 702 703 static int 704 __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue, 705 struct sk_buff *skb, struct nf_queue_entry *entry) 706 { 707 int ret = -ENOMEM; 708 struct nf_queue_entry *entry_seg; 709 710 nf_bridge_adjust_segmented_data(skb); 711 712 if (skb->next == NULL) { /* last packet, no need to copy entry */ 713 struct sk_buff *gso_skb = entry->skb; 714 entry->skb = skb; 715 ret = __nfqnl_enqueue_packet(net, queue, entry); 716 if (ret) 717 entry->skb = gso_skb; 718 return ret; 719 } 720 721 skb->next = NULL; 722 723 entry_seg = nf_queue_entry_dup(entry); 724 if (entry_seg) { 725 entry_seg->skb = skb; 726 ret = __nfqnl_enqueue_packet(net, queue, entry_seg); 727 if (ret) 728 free_entry(entry_seg); 729 } 730 return ret; 731 } 732 733 static int 734 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) 735 { 736 unsigned int queued; 737 struct nfqnl_instance *queue; 738 struct sk_buff *skb, *segs; 739 int err = -ENOBUFS; 740 struct net *net = entry->state.net; 741 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 742 743 /* rcu_read_lock()ed by nf_hook_thresh */ 744 queue = instance_lookup(q, queuenum); 745 if (!queue) 746 return -ESRCH; 747 748 if (queue->copy_mode == NFQNL_COPY_NONE) 749 return -EINVAL; 750 751 skb = entry->skb; 752 753 switch (entry->state.pf) { 754 case NFPROTO_IPV4: 755 skb->protocol = htons(ETH_P_IP); 756 break; 757 case NFPROTO_IPV6: 758 skb->protocol = htons(ETH_P_IPV6); 759 break; 760 } 761 762 if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb)) 763 return __nfqnl_enqueue_packet(net, queue, entry); 764 765 nf_bridge_adjust_skb_data(skb); 766 segs = skb_gso_segment(skb, 0); 767 /* Does not use PTR_ERR to limit the number of error codes that can be 768 * returned by nf_queue. For instance, callers rely on -ESRCH to 769 * mean 'ignore this hook'. 770 */ 771 if (IS_ERR_OR_NULL(segs)) 772 goto out_err; 773 queued = 0; 774 err = 0; 775 do { 776 struct sk_buff *nskb = segs->next; 777 if (err == 0) 778 err = __nfqnl_enqueue_packet_gso(net, queue, 779 segs, entry); 780 if (err == 0) 781 queued++; 782 else 783 kfree_skb(segs); 784 segs = nskb; 785 } while (segs); 786 787 if (queued) { 788 if (err) /* some segments are already queued */ 789 free_entry(entry); 790 kfree_skb(skb); 791 return 0; 792 } 793 out_err: 794 nf_bridge_adjust_segmented_data(skb); 795 return err; 796 } 797 798 static int 799 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) 800 { 801 struct sk_buff *nskb; 802 803 if (diff < 0) { 804 if (pskb_trim(e->skb, data_len)) 805 return -ENOMEM; 806 } else if (diff > 0) { 807 if (data_len > 0xFFFF) 808 return -EINVAL; 809 if (diff > skb_tailroom(e->skb)) { 810 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), 811 diff, GFP_ATOMIC); 812 if (!nskb) { 813 printk(KERN_WARNING "nf_queue: OOM " 814 "in mangle, dropping packet\n"); 815 return -ENOMEM; 816 } 817 kfree_skb(e->skb); 818 e->skb = nskb; 819 } 820 skb_put(e->skb, diff); 821 } 822 if (!skb_make_writable(e->skb, data_len)) 823 return -ENOMEM; 824 skb_copy_to_linear_data(e->skb, data, data_len); 825 e->skb->ip_summed = CHECKSUM_NONE; 826 return 0; 827 } 828 829 static int 830 nfqnl_set_mode(struct nfqnl_instance *queue, 831 unsigned char mode, unsigned int range) 832 { 833 int status = 0; 834 835 spin_lock_bh(&queue->lock); 836 switch (mode) { 837 case NFQNL_COPY_NONE: 838 case NFQNL_COPY_META: 839 queue->copy_mode = mode; 840 queue->copy_range = 0; 841 break; 842 843 case NFQNL_COPY_PACKET: 844 queue->copy_mode = mode; 845 if (range == 0 || range > NFQNL_MAX_COPY_RANGE) 846 queue->copy_range = NFQNL_MAX_COPY_RANGE; 847 else 848 queue->copy_range = range; 849 break; 850 851 default: 852 status = -EINVAL; 853 854 } 855 spin_unlock_bh(&queue->lock); 856 857 return status; 858 } 859 860 static int 861 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) 862 { 863 if (entry->state.in) 864 if (entry->state.in->ifindex == ifindex) 865 return 1; 866 if (entry->state.out) 867 if (entry->state.out->ifindex == ifindex) 868 return 1; 869 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 870 if (entry->skb->nf_bridge) { 871 int physinif, physoutif; 872 873 physinif = nf_bridge_get_physinif(entry->skb); 874 physoutif = nf_bridge_get_physoutif(entry->skb); 875 876 if (physinif == ifindex || physoutif == ifindex) 877 return 1; 878 } 879 #endif 880 return 0; 881 } 882 883 /* drop all packets with either indev or outdev == ifindex from all queue 884 * instances */ 885 static void 886 nfqnl_dev_drop(struct net *net, int ifindex) 887 { 888 int i; 889 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 890 891 rcu_read_lock(); 892 893 for (i = 0; i < INSTANCE_BUCKETS; i++) { 894 struct nfqnl_instance *inst; 895 struct hlist_head *head = &q->instance_table[i]; 896 897 hlist_for_each_entry_rcu(inst, head, hlist) 898 nfqnl_flush(inst, dev_cmp, ifindex); 899 } 900 901 rcu_read_unlock(); 902 } 903 904 static int 905 nfqnl_rcv_dev_event(struct notifier_block *this, 906 unsigned long event, void *ptr) 907 { 908 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 909 910 /* Drop any packets associated with the downed device */ 911 if (event == NETDEV_DOWN) 912 nfqnl_dev_drop(dev_net(dev), dev->ifindex); 913 return NOTIFY_DONE; 914 } 915 916 static struct notifier_block nfqnl_dev_notifier = { 917 .notifier_call = nfqnl_rcv_dev_event, 918 }; 919 920 static int nf_hook_cmp(struct nf_queue_entry *entry, unsigned long ops_ptr) 921 { 922 return entry->elem == (struct nf_hook_ops *)ops_ptr; 923 } 924 925 static void nfqnl_nf_hook_drop(struct net *net, struct nf_hook_ops *hook) 926 { 927 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 928 int i; 929 930 rcu_read_lock(); 931 for (i = 0; i < INSTANCE_BUCKETS; i++) { 932 struct nfqnl_instance *inst; 933 struct hlist_head *head = &q->instance_table[i]; 934 935 hlist_for_each_entry_rcu(inst, head, hlist) 936 nfqnl_flush(inst, nf_hook_cmp, (unsigned long)hook); 937 } 938 rcu_read_unlock(); 939 } 940 941 static int 942 nfqnl_rcv_nl_event(struct notifier_block *this, 943 unsigned long event, void *ptr) 944 { 945 struct netlink_notify *n = ptr; 946 struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); 947 948 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { 949 int i; 950 951 /* destroy all instances for this portid */ 952 spin_lock(&q->instances_lock); 953 for (i = 0; i < INSTANCE_BUCKETS; i++) { 954 struct hlist_node *t2; 955 struct nfqnl_instance *inst; 956 struct hlist_head *head = &q->instance_table[i]; 957 958 hlist_for_each_entry_safe(inst, t2, head, hlist) { 959 if (n->portid == inst->peer_portid) 960 __instance_destroy(inst); 961 } 962 } 963 spin_unlock(&q->instances_lock); 964 } 965 return NOTIFY_DONE; 966 } 967 968 static struct notifier_block nfqnl_rtnl_notifier = { 969 .notifier_call = nfqnl_rcv_nl_event, 970 }; 971 972 static const struct nla_policy nfqa_vlan_policy[NFQA_VLAN_MAX + 1] = { 973 [NFQA_VLAN_TCI] = { .type = NLA_U16}, 974 [NFQA_VLAN_PROTO] = { .type = NLA_U16}, 975 }; 976 977 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { 978 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, 979 [NFQA_MARK] = { .type = NLA_U32 }, 980 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, 981 [NFQA_CT] = { .type = NLA_UNSPEC }, 982 [NFQA_EXP] = { .type = NLA_UNSPEC }, 983 [NFQA_VLAN] = { .type = NLA_NESTED }, 984 }; 985 986 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { 987 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, 988 [NFQA_MARK] = { .type = NLA_U32 }, 989 }; 990 991 static struct nfqnl_instance * 992 verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid) 993 { 994 struct nfqnl_instance *queue; 995 996 queue = instance_lookup(q, queue_num); 997 if (!queue) 998 return ERR_PTR(-ENODEV); 999 1000 if (queue->peer_portid != nlportid) 1001 return ERR_PTR(-EPERM); 1002 1003 return queue; 1004 } 1005 1006 static struct nfqnl_msg_verdict_hdr* 1007 verdicthdr_get(const struct nlattr * const nfqa[]) 1008 { 1009 struct nfqnl_msg_verdict_hdr *vhdr; 1010 unsigned int verdict; 1011 1012 if (!nfqa[NFQA_VERDICT_HDR]) 1013 return NULL; 1014 1015 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); 1016 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; 1017 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) 1018 return NULL; 1019 return vhdr; 1020 } 1021 1022 static int nfq_id_after(unsigned int id, unsigned int max) 1023 { 1024 return (int)(id - max) > 0; 1025 } 1026 1027 static int nfqnl_recv_verdict_batch(struct net *net, struct sock *ctnl, 1028 struct sk_buff *skb, 1029 const struct nlmsghdr *nlh, 1030 const struct nlattr * const nfqa[]) 1031 { 1032 struct nfgenmsg *nfmsg = nlmsg_data(nlh); 1033 struct nf_queue_entry *entry, *tmp; 1034 unsigned int verdict, maxid; 1035 struct nfqnl_msg_verdict_hdr *vhdr; 1036 struct nfqnl_instance *queue; 1037 LIST_HEAD(batch_list); 1038 u16 queue_num = ntohs(nfmsg->res_id); 1039 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1040 1041 queue = verdict_instance_lookup(q, queue_num, 1042 NETLINK_CB(skb).portid); 1043 if (IS_ERR(queue)) 1044 return PTR_ERR(queue); 1045 1046 vhdr = verdicthdr_get(nfqa); 1047 if (!vhdr) 1048 return -EINVAL; 1049 1050 verdict = ntohl(vhdr->verdict); 1051 maxid = ntohl(vhdr->id); 1052 1053 spin_lock_bh(&queue->lock); 1054 1055 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { 1056 if (nfq_id_after(entry->id, maxid)) 1057 break; 1058 __dequeue_entry(queue, entry); 1059 list_add_tail(&entry->list, &batch_list); 1060 } 1061 1062 spin_unlock_bh(&queue->lock); 1063 1064 if (list_empty(&batch_list)) 1065 return -ENOENT; 1066 1067 list_for_each_entry_safe(entry, tmp, &batch_list, list) { 1068 if (nfqa[NFQA_MARK]) 1069 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); 1070 nf_reinject(entry, verdict); 1071 } 1072 return 0; 1073 } 1074 1075 static struct nf_conn *nfqnl_ct_parse(struct nfnl_ct_hook *nfnl_ct, 1076 const struct nlmsghdr *nlh, 1077 const struct nlattr * const nfqa[], 1078 struct nf_queue_entry *entry, 1079 enum ip_conntrack_info *ctinfo) 1080 { 1081 struct nf_conn *ct; 1082 1083 ct = nfnl_ct->get_ct(entry->skb, ctinfo); 1084 if (ct == NULL) 1085 return NULL; 1086 1087 if (nfnl_ct->parse(nfqa[NFQA_CT], ct) < 0) 1088 return NULL; 1089 1090 if (nfqa[NFQA_EXP]) 1091 nfnl_ct->attach_expect(nfqa[NFQA_EXP], ct, 1092 NETLINK_CB(entry->skb).portid, 1093 nlmsg_report(nlh)); 1094 return ct; 1095 } 1096 1097 static int nfqa_parse_bridge(struct nf_queue_entry *entry, 1098 const struct nlattr * const nfqa[]) 1099 { 1100 if (nfqa[NFQA_VLAN]) { 1101 struct nlattr *tb[NFQA_VLAN_MAX + 1]; 1102 int err; 1103 1104 err = nla_parse_nested(tb, NFQA_VLAN_MAX, nfqa[NFQA_VLAN], 1105 nfqa_vlan_policy); 1106 if (err < 0) 1107 return err; 1108 1109 if (!tb[NFQA_VLAN_TCI] || !tb[NFQA_VLAN_PROTO]) 1110 return -EINVAL; 1111 1112 entry->skb->vlan_tci = ntohs(nla_get_be16(tb[NFQA_VLAN_TCI])); 1113 entry->skb->vlan_proto = nla_get_be16(tb[NFQA_VLAN_PROTO]); 1114 } 1115 1116 if (nfqa[NFQA_L2HDR]) { 1117 int mac_header_len = entry->skb->network_header - 1118 entry->skb->mac_header; 1119 1120 if (mac_header_len != nla_len(nfqa[NFQA_L2HDR])) 1121 return -EINVAL; 1122 else if (mac_header_len > 0) 1123 memcpy(skb_mac_header(entry->skb), 1124 nla_data(nfqa[NFQA_L2HDR]), 1125 mac_header_len); 1126 } 1127 1128 return 0; 1129 } 1130 1131 static int nfqnl_recv_verdict(struct net *net, struct sock *ctnl, 1132 struct sk_buff *skb, 1133 const struct nlmsghdr *nlh, 1134 const struct nlattr * const nfqa[]) 1135 { 1136 struct nfgenmsg *nfmsg = nlmsg_data(nlh); 1137 u_int16_t queue_num = ntohs(nfmsg->res_id); 1138 struct nfqnl_msg_verdict_hdr *vhdr; 1139 struct nfqnl_instance *queue; 1140 unsigned int verdict; 1141 struct nf_queue_entry *entry; 1142 enum ip_conntrack_info uninitialized_var(ctinfo); 1143 struct nfnl_ct_hook *nfnl_ct; 1144 struct nf_conn *ct = NULL; 1145 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1146 int err; 1147 1148 queue = verdict_instance_lookup(q, queue_num, 1149 NETLINK_CB(skb).portid); 1150 if (IS_ERR(queue)) 1151 return PTR_ERR(queue); 1152 1153 vhdr = verdicthdr_get(nfqa); 1154 if (!vhdr) 1155 return -EINVAL; 1156 1157 verdict = ntohl(vhdr->verdict); 1158 1159 entry = find_dequeue_entry(queue, ntohl(vhdr->id)); 1160 if (entry == NULL) 1161 return -ENOENT; 1162 1163 /* rcu lock already held from nfnl->call_rcu. */ 1164 nfnl_ct = rcu_dereference(nfnl_ct_hook); 1165 1166 if (nfqa[NFQA_CT]) { 1167 if (nfnl_ct != NULL) 1168 ct = nfqnl_ct_parse(nfnl_ct, nlh, nfqa, entry, &ctinfo); 1169 } 1170 1171 if (entry->state.pf == PF_BRIDGE) { 1172 err = nfqa_parse_bridge(entry, nfqa); 1173 if (err < 0) 1174 return err; 1175 } 1176 1177 if (nfqa[NFQA_PAYLOAD]) { 1178 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); 1179 int diff = payload_len - entry->skb->len; 1180 1181 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), 1182 payload_len, entry, diff) < 0) 1183 verdict = NF_DROP; 1184 1185 if (ct && diff) 1186 nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff); 1187 } 1188 1189 if (nfqa[NFQA_MARK]) 1190 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); 1191 1192 nf_reinject(entry, verdict); 1193 return 0; 1194 } 1195 1196 static int nfqnl_recv_unsupp(struct net *net, struct sock *ctnl, 1197 struct sk_buff *skb, const struct nlmsghdr *nlh, 1198 const struct nlattr * const nfqa[]) 1199 { 1200 return -ENOTSUPP; 1201 } 1202 1203 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { 1204 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, 1205 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, 1206 }; 1207 1208 static const struct nf_queue_handler nfqh = { 1209 .outfn = &nfqnl_enqueue_packet, 1210 .nf_hook_drop = &nfqnl_nf_hook_drop, 1211 }; 1212 1213 static int nfqnl_recv_config(struct net *net, struct sock *ctnl, 1214 struct sk_buff *skb, const struct nlmsghdr *nlh, 1215 const struct nlattr * const nfqa[]) 1216 { 1217 struct nfgenmsg *nfmsg = nlmsg_data(nlh); 1218 u_int16_t queue_num = ntohs(nfmsg->res_id); 1219 struct nfqnl_instance *queue; 1220 struct nfqnl_msg_config_cmd *cmd = NULL; 1221 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1222 __u32 flags = 0, mask = 0; 1223 int ret = 0; 1224 1225 if (nfqa[NFQA_CFG_CMD]) { 1226 cmd = nla_data(nfqa[NFQA_CFG_CMD]); 1227 1228 /* Obsolete commands without queue context */ 1229 switch (cmd->command) { 1230 case NFQNL_CFG_CMD_PF_BIND: return 0; 1231 case NFQNL_CFG_CMD_PF_UNBIND: return 0; 1232 } 1233 } 1234 1235 /* Check if we support these flags in first place, dependencies should 1236 * be there too not to break atomicity. 1237 */ 1238 if (nfqa[NFQA_CFG_FLAGS]) { 1239 if (!nfqa[NFQA_CFG_MASK]) { 1240 /* A mask is needed to specify which flags are being 1241 * changed. 1242 */ 1243 return -EINVAL; 1244 } 1245 1246 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); 1247 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); 1248 1249 if (flags >= NFQA_CFG_F_MAX) 1250 return -EOPNOTSUPP; 1251 1252 #if !IS_ENABLED(CONFIG_NETWORK_SECMARK) 1253 if (flags & mask & NFQA_CFG_F_SECCTX) 1254 return -EOPNOTSUPP; 1255 #endif 1256 if ((flags & mask & NFQA_CFG_F_CONNTRACK) && 1257 !rcu_access_pointer(nfnl_ct_hook)) { 1258 #ifdef CONFIG_MODULES 1259 nfnl_unlock(NFNL_SUBSYS_QUEUE); 1260 request_module("ip_conntrack_netlink"); 1261 nfnl_lock(NFNL_SUBSYS_QUEUE); 1262 if (rcu_access_pointer(nfnl_ct_hook)) 1263 return -EAGAIN; 1264 #endif 1265 return -EOPNOTSUPP; 1266 } 1267 } 1268 1269 rcu_read_lock(); 1270 queue = instance_lookup(q, queue_num); 1271 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { 1272 ret = -EPERM; 1273 goto err_out_unlock; 1274 } 1275 1276 if (cmd != NULL) { 1277 switch (cmd->command) { 1278 case NFQNL_CFG_CMD_BIND: 1279 if (queue) { 1280 ret = -EBUSY; 1281 goto err_out_unlock; 1282 } 1283 queue = instance_create(q, queue_num, 1284 NETLINK_CB(skb).portid); 1285 if (IS_ERR(queue)) { 1286 ret = PTR_ERR(queue); 1287 goto err_out_unlock; 1288 } 1289 break; 1290 case NFQNL_CFG_CMD_UNBIND: 1291 if (!queue) { 1292 ret = -ENODEV; 1293 goto err_out_unlock; 1294 } 1295 instance_destroy(q, queue); 1296 goto err_out_unlock; 1297 case NFQNL_CFG_CMD_PF_BIND: 1298 case NFQNL_CFG_CMD_PF_UNBIND: 1299 break; 1300 default: 1301 ret = -ENOTSUPP; 1302 goto err_out_unlock; 1303 } 1304 } 1305 1306 if (!queue) { 1307 ret = -ENODEV; 1308 goto err_out_unlock; 1309 } 1310 1311 if (nfqa[NFQA_CFG_PARAMS]) { 1312 struct nfqnl_msg_config_params *params = 1313 nla_data(nfqa[NFQA_CFG_PARAMS]); 1314 1315 nfqnl_set_mode(queue, params->copy_mode, 1316 ntohl(params->copy_range)); 1317 } 1318 1319 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { 1320 __be32 *queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); 1321 1322 spin_lock_bh(&queue->lock); 1323 queue->queue_maxlen = ntohl(*queue_maxlen); 1324 spin_unlock_bh(&queue->lock); 1325 } 1326 1327 if (nfqa[NFQA_CFG_FLAGS]) { 1328 spin_lock_bh(&queue->lock); 1329 queue->flags &= ~mask; 1330 queue->flags |= flags & mask; 1331 spin_unlock_bh(&queue->lock); 1332 } 1333 1334 err_out_unlock: 1335 rcu_read_unlock(); 1336 return ret; 1337 } 1338 1339 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { 1340 [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, 1341 .attr_count = NFQA_MAX, }, 1342 [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, 1343 .attr_count = NFQA_MAX, 1344 .policy = nfqa_verdict_policy }, 1345 [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, 1346 .attr_count = NFQA_CFG_MAX, 1347 .policy = nfqa_cfg_policy }, 1348 [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, 1349 .attr_count = NFQA_MAX, 1350 .policy = nfqa_verdict_batch_policy }, 1351 }; 1352 1353 static const struct nfnetlink_subsystem nfqnl_subsys = { 1354 .name = "nf_queue", 1355 .subsys_id = NFNL_SUBSYS_QUEUE, 1356 .cb_count = NFQNL_MSG_MAX, 1357 .cb = nfqnl_cb, 1358 }; 1359 1360 #ifdef CONFIG_PROC_FS 1361 struct iter_state { 1362 struct seq_net_private p; 1363 unsigned int bucket; 1364 }; 1365 1366 static struct hlist_node *get_first(struct seq_file *seq) 1367 { 1368 struct iter_state *st = seq->private; 1369 struct net *net; 1370 struct nfnl_queue_net *q; 1371 1372 if (!st) 1373 return NULL; 1374 1375 net = seq_file_net(seq); 1376 q = nfnl_queue_pernet(net); 1377 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { 1378 if (!hlist_empty(&q->instance_table[st->bucket])) 1379 return q->instance_table[st->bucket].first; 1380 } 1381 return NULL; 1382 } 1383 1384 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) 1385 { 1386 struct iter_state *st = seq->private; 1387 struct net *net = seq_file_net(seq); 1388 1389 h = h->next; 1390 while (!h) { 1391 struct nfnl_queue_net *q; 1392 1393 if (++st->bucket >= INSTANCE_BUCKETS) 1394 return NULL; 1395 1396 q = nfnl_queue_pernet(net); 1397 h = q->instance_table[st->bucket].first; 1398 } 1399 return h; 1400 } 1401 1402 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) 1403 { 1404 struct hlist_node *head; 1405 head = get_first(seq); 1406 1407 if (head) 1408 while (pos && (head = get_next(seq, head))) 1409 pos--; 1410 return pos ? NULL : head; 1411 } 1412 1413 static void *seq_start(struct seq_file *s, loff_t *pos) 1414 __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) 1415 { 1416 spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); 1417 return get_idx(s, *pos); 1418 } 1419 1420 static void *seq_next(struct seq_file *s, void *v, loff_t *pos) 1421 { 1422 (*pos)++; 1423 return get_next(s, v); 1424 } 1425 1426 static void seq_stop(struct seq_file *s, void *v) 1427 __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) 1428 { 1429 spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); 1430 } 1431 1432 static int seq_show(struct seq_file *s, void *v) 1433 { 1434 const struct nfqnl_instance *inst = v; 1435 1436 seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n", 1437 inst->queue_num, 1438 inst->peer_portid, inst->queue_total, 1439 inst->copy_mode, inst->copy_range, 1440 inst->queue_dropped, inst->queue_user_dropped, 1441 inst->id_sequence, 1); 1442 return 0; 1443 } 1444 1445 static const struct seq_operations nfqnl_seq_ops = { 1446 .start = seq_start, 1447 .next = seq_next, 1448 .stop = seq_stop, 1449 .show = seq_show, 1450 }; 1451 1452 static int nfqnl_open(struct inode *inode, struct file *file) 1453 { 1454 return seq_open_net(inode, file, &nfqnl_seq_ops, 1455 sizeof(struct iter_state)); 1456 } 1457 1458 static const struct file_operations nfqnl_file_ops = { 1459 .owner = THIS_MODULE, 1460 .open = nfqnl_open, 1461 .read = seq_read, 1462 .llseek = seq_lseek, 1463 .release = seq_release_net, 1464 }; 1465 1466 #endif /* PROC_FS */ 1467 1468 static int __net_init nfnl_queue_net_init(struct net *net) 1469 { 1470 unsigned int i; 1471 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1472 1473 for (i = 0; i < INSTANCE_BUCKETS; i++) 1474 INIT_HLIST_HEAD(&q->instance_table[i]); 1475 1476 spin_lock_init(&q->instances_lock); 1477 1478 #ifdef CONFIG_PROC_FS 1479 if (!proc_create("nfnetlink_queue", 0440, 1480 net->nf.proc_netfilter, &nfqnl_file_ops)) 1481 return -ENOMEM; 1482 #endif 1483 nf_register_queue_handler(net, &nfqh); 1484 return 0; 1485 } 1486 1487 static void __net_exit nfnl_queue_net_exit(struct net *net) 1488 { 1489 nf_unregister_queue_handler(net); 1490 #ifdef CONFIG_PROC_FS 1491 remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); 1492 #endif 1493 } 1494 1495 static void nfnl_queue_net_exit_batch(struct list_head *net_exit_list) 1496 { 1497 synchronize_rcu(); 1498 } 1499 1500 static struct pernet_operations nfnl_queue_net_ops = { 1501 .init = nfnl_queue_net_init, 1502 .exit = nfnl_queue_net_exit, 1503 .exit_batch = nfnl_queue_net_exit_batch, 1504 .id = &nfnl_queue_net_id, 1505 .size = sizeof(struct nfnl_queue_net), 1506 }; 1507 1508 static int __init nfnetlink_queue_init(void) 1509 { 1510 int status; 1511 1512 status = register_pernet_subsys(&nfnl_queue_net_ops); 1513 if (status < 0) { 1514 pr_err("nf_queue: failed to register pernet ops\n"); 1515 goto out; 1516 } 1517 1518 netlink_register_notifier(&nfqnl_rtnl_notifier); 1519 status = nfnetlink_subsys_register(&nfqnl_subsys); 1520 if (status < 0) { 1521 pr_err("nf_queue: failed to create netlink socket\n"); 1522 goto cleanup_netlink_notifier; 1523 } 1524 1525 status = register_netdevice_notifier(&nfqnl_dev_notifier); 1526 if (status < 0) { 1527 pr_err("nf_queue: failed to register netdevice notifier\n"); 1528 goto cleanup_netlink_subsys; 1529 } 1530 1531 return status; 1532 1533 cleanup_netlink_subsys: 1534 nfnetlink_subsys_unregister(&nfqnl_subsys); 1535 cleanup_netlink_notifier: 1536 netlink_unregister_notifier(&nfqnl_rtnl_notifier); 1537 unregister_pernet_subsys(&nfnl_queue_net_ops); 1538 out: 1539 return status; 1540 } 1541 1542 static void __exit nfnetlink_queue_fini(void) 1543 { 1544 unregister_netdevice_notifier(&nfqnl_dev_notifier); 1545 nfnetlink_subsys_unregister(&nfqnl_subsys); 1546 netlink_unregister_notifier(&nfqnl_rtnl_notifier); 1547 unregister_pernet_subsys(&nfnl_queue_net_ops); 1548 1549 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1550 } 1551 1552 MODULE_DESCRIPTION("netfilter packet queue handler"); 1553 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); 1554 MODULE_LICENSE("GPL"); 1555 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); 1556 1557 module_init(nfnetlink_queue_init); 1558 module_exit(nfnetlink_queue_fini); 1559