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