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 18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 19 20 #include <linux/module.h> 21 #include <linux/skbuff.h> 22 #include <linux/init.h> 23 #include <linux/spinlock.h> 24 #include <linux/slab.h> 25 #include <linux/notifier.h> 26 #include <linux/netdevice.h> 27 #include <linux/netfilter.h> 28 #include <linux/proc_fs.h> 29 #include <linux/netfilter_ipv4.h> 30 #include <linux/netfilter_ipv6.h> 31 #include <linux/netfilter_bridge.h> 32 #include <linux/netfilter/nfnetlink.h> 33 #include <linux/netfilter/nfnetlink_queue.h> 34 #include <linux/netfilter/nf_conntrack_common.h> 35 #include <linux/list.h> 36 #include <net/sock.h> 37 #include <net/tcp_states.h> 38 #include <net/netfilter/nf_queue.h> 39 #include <net/netns/generic.h> 40 41 #include <linux/atomic.h> 42 43 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 44 #include "../bridge/br_private.h" 45 #endif 46 47 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 48 #include <net/netfilter/nf_conntrack.h> 49 #endif 50 51 #define NFQNL_QMAX_DEFAULT 1024 52 53 /* We're using struct nlattr which has 16bit nla_len. Note that nla_len 54 * includes the header length. Thus, the maximum packet length that we 55 * support is 65531 bytes. We send truncated packets if the specified length 56 * is larger than that. Userspace can check for presence of NFQA_CAP_LEN 57 * attribute to detect truncation. 58 */ 59 #define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN) 60 61 struct nfqnl_instance { 62 struct hlist_node hlist; /* global list of queues */ 63 struct rcu_head rcu; 64 65 u32 peer_portid; 66 unsigned int queue_maxlen; 67 unsigned int copy_range; 68 unsigned int queue_dropped; 69 unsigned int queue_user_dropped; 70 71 72 u_int16_t queue_num; /* number of this queue */ 73 u_int8_t copy_mode; 74 u_int32_t flags; /* Set using NFQA_CFG_FLAGS */ 75 /* 76 * Following fields are dirtied for each queued packet, 77 * keep them in same cache line if possible. 78 */ 79 spinlock_t lock ____cacheline_aligned_in_smp; 80 unsigned int queue_total; 81 unsigned int id_sequence; /* 'sequence' of pkt ids */ 82 struct list_head queue_list; /* packets in queue */ 83 }; 84 85 typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long); 86 87 static unsigned int nfnl_queue_net_id __read_mostly; 88 89 #define INSTANCE_BUCKETS 16 90 struct nfnl_queue_net { 91 spinlock_t instances_lock; 92 struct hlist_head instance_table[INSTANCE_BUCKETS]; 93 }; 94 95 static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net) 96 { 97 return net_generic(net, nfnl_queue_net_id); 98 } 99 100 static inline u_int8_t instance_hashfn(u_int16_t queue_num) 101 { 102 return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS; 103 } 104 105 static struct nfqnl_instance * 106 instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num) 107 { 108 struct hlist_head *head; 109 struct nfqnl_instance *inst; 110 111 head = &q->instance_table[instance_hashfn(queue_num)]; 112 hlist_for_each_entry_rcu(inst, head, hlist) { 113 if (inst->queue_num == queue_num) 114 return inst; 115 } 116 return NULL; 117 } 118 119 static struct nfqnl_instance * 120 instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, u32 portid) 121 { 122 struct nfqnl_instance *inst; 123 unsigned int h; 124 int err; 125 126 spin_lock(&q->instances_lock); 127 if (instance_lookup(q, queue_num)) { 128 err = -EEXIST; 129 goto out_unlock; 130 } 131 132 inst = kzalloc(sizeof(*inst), GFP_ATOMIC); 133 if (!inst) { 134 err = -ENOMEM; 135 goto out_unlock; 136 } 137 138 inst->queue_num = queue_num; 139 inst->peer_portid = portid; 140 inst->queue_maxlen = NFQNL_QMAX_DEFAULT; 141 inst->copy_range = NFQNL_MAX_COPY_RANGE; 142 inst->copy_mode = NFQNL_COPY_NONE; 143 spin_lock_init(&inst->lock); 144 INIT_LIST_HEAD(&inst->queue_list); 145 146 if (!try_module_get(THIS_MODULE)) { 147 err = -EAGAIN; 148 goto out_free; 149 } 150 151 h = instance_hashfn(queue_num); 152 hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]); 153 154 spin_unlock(&q->instances_lock); 155 156 return inst; 157 158 out_free: 159 kfree(inst); 160 out_unlock: 161 spin_unlock(&q->instances_lock); 162 return ERR_PTR(err); 163 } 164 165 static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, 166 unsigned long data); 167 168 static void 169 instance_destroy_rcu(struct rcu_head *head) 170 { 171 struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance, 172 rcu); 173 174 nfqnl_flush(inst, NULL, 0); 175 kfree(inst); 176 module_put(THIS_MODULE); 177 } 178 179 static void 180 __instance_destroy(struct nfqnl_instance *inst) 181 { 182 hlist_del_rcu(&inst->hlist); 183 call_rcu(&inst->rcu, instance_destroy_rcu); 184 } 185 186 static void 187 instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst) 188 { 189 spin_lock(&q->instances_lock); 190 __instance_destroy(inst); 191 spin_unlock(&q->instances_lock); 192 } 193 194 static inline void 195 __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) 196 { 197 list_add_tail(&entry->list, &queue->queue_list); 198 queue->queue_total++; 199 } 200 201 static void 202 __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) 203 { 204 list_del(&entry->list); 205 queue->queue_total--; 206 } 207 208 static struct nf_queue_entry * 209 find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id) 210 { 211 struct nf_queue_entry *entry = NULL, *i; 212 213 spin_lock_bh(&queue->lock); 214 215 list_for_each_entry(i, &queue->queue_list, list) { 216 if (i->id == id) { 217 entry = i; 218 break; 219 } 220 } 221 222 if (entry) 223 __dequeue_entry(queue, entry); 224 225 spin_unlock_bh(&queue->lock); 226 227 return entry; 228 } 229 230 static void nfqnl_reinject(struct nf_queue_entry *entry, unsigned int verdict) 231 { 232 struct nf_ct_hook *ct_hook; 233 int err; 234 235 if (verdict == NF_ACCEPT || 236 verdict == NF_STOP) { 237 rcu_read_lock(); 238 ct_hook = rcu_dereference(nf_ct_hook); 239 if (ct_hook) { 240 err = ct_hook->update(entry->state.net, entry->skb); 241 if (err < 0) 242 verdict = NF_DROP; 243 } 244 rcu_read_unlock(); 245 } 246 nf_reinject(entry, verdict); 247 } 248 249 static void 250 nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) 251 { 252 struct nf_queue_entry *entry, *next; 253 254 spin_lock_bh(&queue->lock); 255 list_for_each_entry_safe(entry, next, &queue->queue_list, list) { 256 if (!cmpfn || cmpfn(entry, data)) { 257 list_del(&entry->list); 258 queue->queue_total--; 259 nfqnl_reinject(entry, NF_DROP); 260 } 261 } 262 spin_unlock_bh(&queue->lock); 263 } 264 265 static int 266 nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet, 267 bool csum_verify) 268 { 269 __u32 flags = 0; 270 271 if (packet->ip_summed == CHECKSUM_PARTIAL) 272 flags = NFQA_SKB_CSUMNOTREADY; 273 else if (csum_verify) 274 flags = NFQA_SKB_CSUM_NOTVERIFIED; 275 276 if (skb_is_gso(packet)) 277 flags |= NFQA_SKB_GSO; 278 279 return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0; 280 } 281 282 static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk) 283 { 284 const struct cred *cred; 285 286 if (!sk_fullsock(sk)) 287 return 0; 288 289 read_lock_bh(&sk->sk_callback_lock); 290 if (sk->sk_socket && sk->sk_socket->file) { 291 cred = sk->sk_socket->file->f_cred; 292 if (nla_put_be32(skb, NFQA_UID, 293 htonl(from_kuid_munged(&init_user_ns, cred->fsuid)))) 294 goto nla_put_failure; 295 if (nla_put_be32(skb, NFQA_GID, 296 htonl(from_kgid_munged(&init_user_ns, cred->fsgid)))) 297 goto nla_put_failure; 298 } 299 read_unlock_bh(&sk->sk_callback_lock); 300 return 0; 301 302 nla_put_failure: 303 read_unlock_bh(&sk->sk_callback_lock); 304 return -1; 305 } 306 307 static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata) 308 { 309 u32 seclen = 0; 310 #if IS_ENABLED(CONFIG_NETWORK_SECMARK) 311 if (!skb || !sk_fullsock(skb->sk)) 312 return 0; 313 314 read_lock_bh(&skb->sk->sk_callback_lock); 315 316 if (skb->secmark) 317 security_secid_to_secctx(skb->secmark, secdata, &seclen); 318 319 read_unlock_bh(&skb->sk->sk_callback_lock); 320 #endif 321 return seclen; 322 } 323 324 static u32 nfqnl_get_bridge_size(struct nf_queue_entry *entry) 325 { 326 struct sk_buff *entskb = entry->skb; 327 u32 nlalen = 0; 328 329 if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb)) 330 return 0; 331 332 if (skb_vlan_tag_present(entskb)) 333 nlalen += nla_total_size(nla_total_size(sizeof(__be16)) + 334 nla_total_size(sizeof(__be16))); 335 336 if (entskb->network_header > entskb->mac_header) 337 nlalen += nla_total_size((entskb->network_header - 338 entskb->mac_header)); 339 340 return nlalen; 341 } 342 343 static int nfqnl_put_bridge(struct nf_queue_entry *entry, struct sk_buff *skb) 344 { 345 struct sk_buff *entskb = entry->skb; 346 347 if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb)) 348 return 0; 349 350 if (skb_vlan_tag_present(entskb)) { 351 struct nlattr *nest; 352 353 nest = nla_nest_start(skb, NFQA_VLAN | NLA_F_NESTED); 354 if (!nest) 355 goto nla_put_failure; 356 357 if (nla_put_be16(skb, NFQA_VLAN_TCI, htons(entskb->vlan_tci)) || 358 nla_put_be16(skb, NFQA_VLAN_PROTO, entskb->vlan_proto)) 359 goto nla_put_failure; 360 361 nla_nest_end(skb, nest); 362 } 363 364 if (entskb->mac_header < entskb->network_header) { 365 int len = (int)(entskb->network_header - entskb->mac_header); 366 367 if (nla_put(skb, NFQA_L2HDR, len, skb_mac_header(entskb))) 368 goto nla_put_failure; 369 } 370 371 return 0; 372 373 nla_put_failure: 374 return -1; 375 } 376 377 static struct sk_buff * 378 nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, 379 struct nf_queue_entry *entry, 380 __be32 **packet_id_ptr) 381 { 382 size_t size; 383 size_t data_len = 0, cap_len = 0; 384 unsigned int hlen = 0; 385 struct sk_buff *skb; 386 struct nlattr *nla; 387 struct nfqnl_msg_packet_hdr *pmsg; 388 struct nlmsghdr *nlh; 389 struct nfgenmsg *nfmsg; 390 struct sk_buff *entskb = entry->skb; 391 struct net_device *indev; 392 struct net_device *outdev; 393 struct nf_conn *ct = NULL; 394 enum ip_conntrack_info uninitialized_var(ctinfo); 395 struct nfnl_ct_hook *nfnl_ct; 396 bool csum_verify; 397 char *secdata = NULL; 398 u32 seclen = 0; 399 400 size = nlmsg_total_size(sizeof(struct nfgenmsg)) 401 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) 402 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 403 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 404 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 405 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 406 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 407 #endif 408 + nla_total_size(sizeof(u_int32_t)) /* mark */ 409 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) 410 + nla_total_size(sizeof(u_int32_t)) /* skbinfo */ 411 + nla_total_size(sizeof(u_int32_t)); /* cap_len */ 412 413 if (entskb->tstamp) 414 size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); 415 416 size += nfqnl_get_bridge_size(entry); 417 418 if (entry->state.hook <= NF_INET_FORWARD || 419 (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL)) 420 csum_verify = !skb_csum_unnecessary(entskb); 421 else 422 csum_verify = false; 423 424 outdev = entry->state.out; 425 426 switch ((enum nfqnl_config_mode)READ_ONCE(queue->copy_mode)) { 427 case NFQNL_COPY_META: 428 case NFQNL_COPY_NONE: 429 break; 430 431 case NFQNL_COPY_PACKET: 432 if (!(queue->flags & NFQA_CFG_F_GSO) && 433 entskb->ip_summed == CHECKSUM_PARTIAL && 434 skb_checksum_help(entskb)) 435 return NULL; 436 437 data_len = READ_ONCE(queue->copy_range); 438 if (data_len > entskb->len) 439 data_len = entskb->len; 440 441 hlen = skb_zerocopy_headlen(entskb); 442 hlen = min_t(unsigned int, hlen, data_len); 443 size += sizeof(struct nlattr) + hlen; 444 cap_len = entskb->len; 445 break; 446 } 447 448 nfnl_ct = rcu_dereference(nfnl_ct_hook); 449 450 if (queue->flags & NFQA_CFG_F_CONNTRACK) { 451 if (nfnl_ct != NULL) { 452 ct = nfnl_ct->get_ct(entskb, &ctinfo); 453 if (ct != NULL) 454 size += nfnl_ct->build_size(ct); 455 } 456 } 457 458 if (queue->flags & NFQA_CFG_F_UID_GID) { 459 size += (nla_total_size(sizeof(u_int32_t)) /* uid */ 460 + nla_total_size(sizeof(u_int32_t))); /* gid */ 461 } 462 463 if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) { 464 seclen = nfqnl_get_sk_secctx(entskb, &secdata); 465 if (seclen) 466 size += nla_total_size(seclen); 467 } 468 469 skb = alloc_skb(size, GFP_ATOMIC); 470 if (!skb) { 471 skb_tx_error(entskb); 472 goto nlmsg_failure; 473 } 474 475 nlh = nlmsg_put(skb, 0, 0, 476 nfnl_msg_type(NFNL_SUBSYS_QUEUE, NFQNL_MSG_PACKET), 477 sizeof(struct nfgenmsg), 0); 478 if (!nlh) { 479 skb_tx_error(entskb); 480 kfree_skb(skb); 481 goto nlmsg_failure; 482 } 483 nfmsg = nlmsg_data(nlh); 484 nfmsg->nfgen_family = entry->state.pf; 485 nfmsg->version = NFNETLINK_V0; 486 nfmsg->res_id = htons(queue->queue_num); 487 488 nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); 489 pmsg = nla_data(nla); 490 pmsg->hw_protocol = entskb->protocol; 491 pmsg->hook = entry->state.hook; 492 *packet_id_ptr = &pmsg->packet_id; 493 494 indev = entry->state.in; 495 if (indev) { 496 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 497 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) 498 goto nla_put_failure; 499 #else 500 if (entry->state.pf == PF_BRIDGE) { 501 /* Case 1: indev is physical input device, we need to 502 * look for bridge group (when called from 503 * netfilter_bridge) */ 504 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, 505 htonl(indev->ifindex)) || 506 /* this is the bridge group "brX" */ 507 /* rcu_read_lock()ed by __nf_queue */ 508 nla_put_be32(skb, NFQA_IFINDEX_INDEV, 509 htonl(br_port_get_rcu(indev)->br->dev->ifindex))) 510 goto nla_put_failure; 511 } else { 512 int physinif; 513 514 /* Case 2: indev is bridge group, we need to look for 515 * physical device (when called from ipv4) */ 516 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, 517 htonl(indev->ifindex))) 518 goto nla_put_failure; 519 520 physinif = nf_bridge_get_physinif(entskb); 521 if (physinif && 522 nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, 523 htonl(physinif))) 524 goto nla_put_failure; 525 } 526 #endif 527 } 528 529 if (outdev) { 530 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 531 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) 532 goto nla_put_failure; 533 #else 534 if (entry->state.pf == PF_BRIDGE) { 535 /* Case 1: outdev is physical output device, we need to 536 * look for bridge group (when called from 537 * netfilter_bridge) */ 538 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, 539 htonl(outdev->ifindex)) || 540 /* this is the bridge group "brX" */ 541 /* rcu_read_lock()ed by __nf_queue */ 542 nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, 543 htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) 544 goto nla_put_failure; 545 } else { 546 int physoutif; 547 548 /* Case 2: outdev is bridge group, we need to look for 549 * physical output device (when called from ipv4) */ 550 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, 551 htonl(outdev->ifindex))) 552 goto nla_put_failure; 553 554 physoutif = nf_bridge_get_physoutif(entskb); 555 if (physoutif && 556 nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, 557 htonl(physoutif))) 558 goto nla_put_failure; 559 } 560 #endif 561 } 562 563 if (entskb->mark && 564 nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) 565 goto nla_put_failure; 566 567 if (indev && entskb->dev && 568 entskb->mac_header != entskb->network_header) { 569 struct nfqnl_msg_packet_hw phw; 570 int len; 571 572 memset(&phw, 0, sizeof(phw)); 573 len = dev_parse_header(entskb, phw.hw_addr); 574 if (len) { 575 phw.hw_addrlen = htons(len); 576 if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) 577 goto nla_put_failure; 578 } 579 } 580 581 if (nfqnl_put_bridge(entry, skb) < 0) 582 goto nla_put_failure; 583 584 if (entskb->tstamp) { 585 struct nfqnl_msg_packet_timestamp ts; 586 struct timespec64 kts = ktime_to_timespec64(entskb->tstamp); 587 588 ts.sec = cpu_to_be64(kts.tv_sec); 589 ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC); 590 591 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) 592 goto nla_put_failure; 593 } 594 595 if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk && 596 nfqnl_put_sk_uidgid(skb, entskb->sk) < 0) 597 goto nla_put_failure; 598 599 if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata)) 600 goto nla_put_failure; 601 602 if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0) 603 goto nla_put_failure; 604 605 if (cap_len > data_len && 606 nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) 607 goto nla_put_failure; 608 609 if (nfqnl_put_packet_info(skb, entskb, csum_verify)) 610 goto nla_put_failure; 611 612 if (data_len) { 613 struct nlattr *nla; 614 615 if (skb_tailroom(skb) < sizeof(*nla) + hlen) 616 goto nla_put_failure; 617 618 nla = skb_put(skb, sizeof(*nla)); 619 nla->nla_type = NFQA_PAYLOAD; 620 nla->nla_len = nla_attr_size(data_len); 621 622 if (skb_zerocopy(skb, entskb, data_len, hlen)) 623 goto nla_put_failure; 624 } 625 626 nlh->nlmsg_len = skb->len; 627 if (seclen) 628 security_release_secctx(secdata, seclen); 629 return skb; 630 631 nla_put_failure: 632 skb_tx_error(entskb); 633 kfree_skb(skb); 634 net_err_ratelimited("nf_queue: error creating packet message\n"); 635 nlmsg_failure: 636 if (seclen) 637 security_release_secctx(secdata, seclen); 638 return NULL; 639 } 640 641 static bool nf_ct_drop_unconfirmed(const struct nf_queue_entry *entry) 642 { 643 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 644 static const unsigned long flags = IPS_CONFIRMED | IPS_DYING; 645 const struct nf_conn *ct = (void *)skb_nfct(entry->skb); 646 647 if (ct && ((ct->status & flags) == IPS_DYING)) 648 return true; 649 #endif 650 return false; 651 } 652 653 static int 654 __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, 655 struct nf_queue_entry *entry) 656 { 657 struct sk_buff *nskb; 658 int err = -ENOBUFS; 659 __be32 *packet_id_ptr; 660 int failopen = 0; 661 662 nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr); 663 if (nskb == NULL) { 664 err = -ENOMEM; 665 goto err_out; 666 } 667 spin_lock_bh(&queue->lock); 668 669 if (nf_ct_drop_unconfirmed(entry)) 670 goto err_out_free_nskb; 671 672 if (queue->queue_total >= queue->queue_maxlen) { 673 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { 674 failopen = 1; 675 err = 0; 676 } else { 677 queue->queue_dropped++; 678 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", 679 queue->queue_total); 680 } 681 goto err_out_free_nskb; 682 } 683 entry->id = ++queue->id_sequence; 684 *packet_id_ptr = htonl(entry->id); 685 686 /* nfnetlink_unicast will either free the nskb or add it to a socket */ 687 err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT); 688 if (err < 0) { 689 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { 690 failopen = 1; 691 err = 0; 692 } else { 693 queue->queue_user_dropped++; 694 } 695 goto err_out_unlock; 696 } 697 698 __enqueue_entry(queue, entry); 699 700 spin_unlock_bh(&queue->lock); 701 return 0; 702 703 err_out_free_nskb: 704 kfree_skb(nskb); 705 err_out_unlock: 706 spin_unlock_bh(&queue->lock); 707 if (failopen) 708 nfqnl_reinject(entry, NF_ACCEPT); 709 err_out: 710 return err; 711 } 712 713 static struct nf_queue_entry * 714 nf_queue_entry_dup(struct nf_queue_entry *e) 715 { 716 struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); 717 if (entry) 718 nf_queue_entry_get_refs(entry); 719 return entry; 720 } 721 722 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 723 /* When called from bridge netfilter, skb->data must point to MAC header 724 * before calling skb_gso_segment(). Else, original MAC header is lost 725 * and segmented skbs will be sent to wrong destination. 726 */ 727 static void nf_bridge_adjust_skb_data(struct sk_buff *skb) 728 { 729 if (skb->nf_bridge) 730 __skb_push(skb, skb->network_header - skb->mac_header); 731 } 732 733 static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) 734 { 735 if (skb->nf_bridge) 736 __skb_pull(skb, skb->network_header - skb->mac_header); 737 } 738 #else 739 #define nf_bridge_adjust_skb_data(s) do {} while (0) 740 #define nf_bridge_adjust_segmented_data(s) do {} while (0) 741 #endif 742 743 static void free_entry(struct nf_queue_entry *entry) 744 { 745 nf_queue_entry_release_refs(entry); 746 kfree(entry); 747 } 748 749 static int 750 __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue, 751 struct sk_buff *skb, struct nf_queue_entry *entry) 752 { 753 int ret = -ENOMEM; 754 struct nf_queue_entry *entry_seg; 755 756 nf_bridge_adjust_segmented_data(skb); 757 758 if (skb->next == NULL) { /* last packet, no need to copy entry */ 759 struct sk_buff *gso_skb = entry->skb; 760 entry->skb = skb; 761 ret = __nfqnl_enqueue_packet(net, queue, entry); 762 if (ret) 763 entry->skb = gso_skb; 764 return ret; 765 } 766 767 skb->next = NULL; 768 769 entry_seg = nf_queue_entry_dup(entry); 770 if (entry_seg) { 771 entry_seg->skb = skb; 772 ret = __nfqnl_enqueue_packet(net, queue, entry_seg); 773 if (ret) 774 free_entry(entry_seg); 775 } 776 return ret; 777 } 778 779 static int 780 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) 781 { 782 unsigned int queued; 783 struct nfqnl_instance *queue; 784 struct sk_buff *skb, *segs; 785 int err = -ENOBUFS; 786 struct net *net = entry->state.net; 787 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 788 789 /* rcu_read_lock()ed by nf_hook_thresh */ 790 queue = instance_lookup(q, queuenum); 791 if (!queue) 792 return -ESRCH; 793 794 if (queue->copy_mode == NFQNL_COPY_NONE) 795 return -EINVAL; 796 797 skb = entry->skb; 798 799 switch (entry->state.pf) { 800 case NFPROTO_IPV4: 801 skb->protocol = htons(ETH_P_IP); 802 break; 803 case NFPROTO_IPV6: 804 skb->protocol = htons(ETH_P_IPV6); 805 break; 806 } 807 808 if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb)) 809 return __nfqnl_enqueue_packet(net, queue, entry); 810 811 nf_bridge_adjust_skb_data(skb); 812 segs = skb_gso_segment(skb, 0); 813 /* Does not use PTR_ERR to limit the number of error codes that can be 814 * returned by nf_queue. For instance, callers rely on -ESRCH to 815 * mean 'ignore this hook'. 816 */ 817 if (IS_ERR_OR_NULL(segs)) 818 goto out_err; 819 queued = 0; 820 err = 0; 821 do { 822 struct sk_buff *nskb = segs->next; 823 if (err == 0) 824 err = __nfqnl_enqueue_packet_gso(net, queue, 825 segs, entry); 826 if (err == 0) 827 queued++; 828 else 829 kfree_skb(segs); 830 segs = nskb; 831 } while (segs); 832 833 if (queued) { 834 if (err) /* some segments are already queued */ 835 free_entry(entry); 836 kfree_skb(skb); 837 return 0; 838 } 839 out_err: 840 nf_bridge_adjust_segmented_data(skb); 841 return err; 842 } 843 844 static int 845 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) 846 { 847 struct sk_buff *nskb; 848 849 if (diff < 0) { 850 if (pskb_trim(e->skb, data_len)) 851 return -ENOMEM; 852 } else if (diff > 0) { 853 if (data_len > 0xFFFF) 854 return -EINVAL; 855 if (diff > skb_tailroom(e->skb)) { 856 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), 857 diff, GFP_ATOMIC); 858 if (!nskb) 859 return -ENOMEM; 860 kfree_skb(e->skb); 861 e->skb = nskb; 862 } 863 skb_put(e->skb, diff); 864 } 865 if (!skb_make_writable(e->skb, data_len)) 866 return -ENOMEM; 867 skb_copy_to_linear_data(e->skb, data, data_len); 868 e->skb->ip_summed = CHECKSUM_NONE; 869 return 0; 870 } 871 872 static int 873 nfqnl_set_mode(struct nfqnl_instance *queue, 874 unsigned char mode, unsigned int range) 875 { 876 int status = 0; 877 878 spin_lock_bh(&queue->lock); 879 switch (mode) { 880 case NFQNL_COPY_NONE: 881 case NFQNL_COPY_META: 882 queue->copy_mode = mode; 883 queue->copy_range = 0; 884 break; 885 886 case NFQNL_COPY_PACKET: 887 queue->copy_mode = mode; 888 if (range == 0 || range > NFQNL_MAX_COPY_RANGE) 889 queue->copy_range = NFQNL_MAX_COPY_RANGE; 890 else 891 queue->copy_range = range; 892 break; 893 894 default: 895 status = -EINVAL; 896 897 } 898 spin_unlock_bh(&queue->lock); 899 900 return status; 901 } 902 903 static int 904 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) 905 { 906 if (entry->state.in) 907 if (entry->state.in->ifindex == ifindex) 908 return 1; 909 if (entry->state.out) 910 if (entry->state.out->ifindex == ifindex) 911 return 1; 912 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 913 if (entry->skb->nf_bridge) { 914 int physinif, physoutif; 915 916 physinif = nf_bridge_get_physinif(entry->skb); 917 physoutif = nf_bridge_get_physoutif(entry->skb); 918 919 if (physinif == ifindex || physoutif == ifindex) 920 return 1; 921 } 922 #endif 923 return 0; 924 } 925 926 /* drop all packets with either indev or outdev == ifindex from all queue 927 * instances */ 928 static void 929 nfqnl_dev_drop(struct net *net, int ifindex) 930 { 931 int i; 932 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 933 934 rcu_read_lock(); 935 936 for (i = 0; i < INSTANCE_BUCKETS; i++) { 937 struct nfqnl_instance *inst; 938 struct hlist_head *head = &q->instance_table[i]; 939 940 hlist_for_each_entry_rcu(inst, head, hlist) 941 nfqnl_flush(inst, dev_cmp, ifindex); 942 } 943 944 rcu_read_unlock(); 945 } 946 947 static int 948 nfqnl_rcv_dev_event(struct notifier_block *this, 949 unsigned long event, void *ptr) 950 { 951 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 952 953 /* Drop any packets associated with the downed device */ 954 if (event == NETDEV_DOWN) 955 nfqnl_dev_drop(dev_net(dev), dev->ifindex); 956 return NOTIFY_DONE; 957 } 958 959 static struct notifier_block nfqnl_dev_notifier = { 960 .notifier_call = nfqnl_rcv_dev_event, 961 }; 962 963 static void nfqnl_nf_hook_drop(struct net *net) 964 { 965 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 966 int i; 967 968 for (i = 0; i < INSTANCE_BUCKETS; i++) { 969 struct nfqnl_instance *inst; 970 struct hlist_head *head = &q->instance_table[i]; 971 972 hlist_for_each_entry_rcu(inst, head, hlist) 973 nfqnl_flush(inst, NULL, 0); 974 } 975 } 976 977 static int 978 nfqnl_rcv_nl_event(struct notifier_block *this, 979 unsigned long event, void *ptr) 980 { 981 struct netlink_notify *n = ptr; 982 struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); 983 984 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { 985 int i; 986 987 /* destroy all instances for this portid */ 988 spin_lock(&q->instances_lock); 989 for (i = 0; i < INSTANCE_BUCKETS; i++) { 990 struct hlist_node *t2; 991 struct nfqnl_instance *inst; 992 struct hlist_head *head = &q->instance_table[i]; 993 994 hlist_for_each_entry_safe(inst, t2, head, hlist) { 995 if (n->portid == inst->peer_portid) 996 __instance_destroy(inst); 997 } 998 } 999 spin_unlock(&q->instances_lock); 1000 } 1001 return NOTIFY_DONE; 1002 } 1003 1004 static struct notifier_block nfqnl_rtnl_notifier = { 1005 .notifier_call = nfqnl_rcv_nl_event, 1006 }; 1007 1008 static const struct nla_policy nfqa_vlan_policy[NFQA_VLAN_MAX + 1] = { 1009 [NFQA_VLAN_TCI] = { .type = NLA_U16}, 1010 [NFQA_VLAN_PROTO] = { .type = NLA_U16}, 1011 }; 1012 1013 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { 1014 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, 1015 [NFQA_MARK] = { .type = NLA_U32 }, 1016 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, 1017 [NFQA_CT] = { .type = NLA_UNSPEC }, 1018 [NFQA_EXP] = { .type = NLA_UNSPEC }, 1019 [NFQA_VLAN] = { .type = NLA_NESTED }, 1020 }; 1021 1022 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { 1023 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, 1024 [NFQA_MARK] = { .type = NLA_U32 }, 1025 }; 1026 1027 static struct nfqnl_instance * 1028 verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid) 1029 { 1030 struct nfqnl_instance *queue; 1031 1032 queue = instance_lookup(q, queue_num); 1033 if (!queue) 1034 return ERR_PTR(-ENODEV); 1035 1036 if (queue->peer_portid != nlportid) 1037 return ERR_PTR(-EPERM); 1038 1039 return queue; 1040 } 1041 1042 static struct nfqnl_msg_verdict_hdr* 1043 verdicthdr_get(const struct nlattr * const nfqa[]) 1044 { 1045 struct nfqnl_msg_verdict_hdr *vhdr; 1046 unsigned int verdict; 1047 1048 if (!nfqa[NFQA_VERDICT_HDR]) 1049 return NULL; 1050 1051 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); 1052 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; 1053 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) 1054 return NULL; 1055 return vhdr; 1056 } 1057 1058 static int nfq_id_after(unsigned int id, unsigned int max) 1059 { 1060 return (int)(id - max) > 0; 1061 } 1062 1063 static int nfqnl_recv_verdict_batch(struct net *net, struct sock *ctnl, 1064 struct sk_buff *skb, 1065 const struct nlmsghdr *nlh, 1066 const struct nlattr * const nfqa[], 1067 struct netlink_ext_ack *extack) 1068 { 1069 struct nfgenmsg *nfmsg = nlmsg_data(nlh); 1070 struct nf_queue_entry *entry, *tmp; 1071 unsigned int verdict, maxid; 1072 struct nfqnl_msg_verdict_hdr *vhdr; 1073 struct nfqnl_instance *queue; 1074 LIST_HEAD(batch_list); 1075 u16 queue_num = ntohs(nfmsg->res_id); 1076 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1077 1078 queue = verdict_instance_lookup(q, queue_num, 1079 NETLINK_CB(skb).portid); 1080 if (IS_ERR(queue)) 1081 return PTR_ERR(queue); 1082 1083 vhdr = verdicthdr_get(nfqa); 1084 if (!vhdr) 1085 return -EINVAL; 1086 1087 verdict = ntohl(vhdr->verdict); 1088 maxid = ntohl(vhdr->id); 1089 1090 spin_lock_bh(&queue->lock); 1091 1092 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { 1093 if (nfq_id_after(entry->id, maxid)) 1094 break; 1095 __dequeue_entry(queue, entry); 1096 list_add_tail(&entry->list, &batch_list); 1097 } 1098 1099 spin_unlock_bh(&queue->lock); 1100 1101 if (list_empty(&batch_list)) 1102 return -ENOENT; 1103 1104 list_for_each_entry_safe(entry, tmp, &batch_list, list) { 1105 if (nfqa[NFQA_MARK]) 1106 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); 1107 1108 nfqnl_reinject(entry, verdict); 1109 } 1110 return 0; 1111 } 1112 1113 static struct nf_conn *nfqnl_ct_parse(struct nfnl_ct_hook *nfnl_ct, 1114 const struct nlmsghdr *nlh, 1115 const struct nlattr * const nfqa[], 1116 struct nf_queue_entry *entry, 1117 enum ip_conntrack_info *ctinfo) 1118 { 1119 struct nf_conn *ct; 1120 1121 ct = nfnl_ct->get_ct(entry->skb, ctinfo); 1122 if (ct == NULL) 1123 return NULL; 1124 1125 if (nfnl_ct->parse(nfqa[NFQA_CT], ct) < 0) 1126 return NULL; 1127 1128 if (nfqa[NFQA_EXP]) 1129 nfnl_ct->attach_expect(nfqa[NFQA_EXP], ct, 1130 NETLINK_CB(entry->skb).portid, 1131 nlmsg_report(nlh)); 1132 return ct; 1133 } 1134 1135 static int nfqa_parse_bridge(struct nf_queue_entry *entry, 1136 const struct nlattr * const nfqa[]) 1137 { 1138 if (nfqa[NFQA_VLAN]) { 1139 struct nlattr *tb[NFQA_VLAN_MAX + 1]; 1140 int err; 1141 1142 err = nla_parse_nested(tb, NFQA_VLAN_MAX, nfqa[NFQA_VLAN], 1143 nfqa_vlan_policy, NULL); 1144 if (err < 0) 1145 return err; 1146 1147 if (!tb[NFQA_VLAN_TCI] || !tb[NFQA_VLAN_PROTO]) 1148 return -EINVAL; 1149 1150 entry->skb->vlan_tci = ntohs(nla_get_be16(tb[NFQA_VLAN_TCI])); 1151 entry->skb->vlan_proto = nla_get_be16(tb[NFQA_VLAN_PROTO]); 1152 } 1153 1154 if (nfqa[NFQA_L2HDR]) { 1155 int mac_header_len = entry->skb->network_header - 1156 entry->skb->mac_header; 1157 1158 if (mac_header_len != nla_len(nfqa[NFQA_L2HDR])) 1159 return -EINVAL; 1160 else if (mac_header_len > 0) 1161 memcpy(skb_mac_header(entry->skb), 1162 nla_data(nfqa[NFQA_L2HDR]), 1163 mac_header_len); 1164 } 1165 1166 return 0; 1167 } 1168 1169 static int nfqnl_recv_verdict(struct net *net, struct sock *ctnl, 1170 struct sk_buff *skb, 1171 const struct nlmsghdr *nlh, 1172 const struct nlattr * const nfqa[], 1173 struct netlink_ext_ack *extack) 1174 { 1175 struct nfgenmsg *nfmsg = nlmsg_data(nlh); 1176 u_int16_t queue_num = ntohs(nfmsg->res_id); 1177 struct nfqnl_msg_verdict_hdr *vhdr; 1178 struct nfqnl_instance *queue; 1179 unsigned int verdict; 1180 struct nf_queue_entry *entry; 1181 enum ip_conntrack_info uninitialized_var(ctinfo); 1182 struct nfnl_ct_hook *nfnl_ct; 1183 struct nf_conn *ct = NULL; 1184 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1185 int err; 1186 1187 queue = verdict_instance_lookup(q, queue_num, 1188 NETLINK_CB(skb).portid); 1189 if (IS_ERR(queue)) 1190 return PTR_ERR(queue); 1191 1192 vhdr = verdicthdr_get(nfqa); 1193 if (!vhdr) 1194 return -EINVAL; 1195 1196 verdict = ntohl(vhdr->verdict); 1197 1198 entry = find_dequeue_entry(queue, ntohl(vhdr->id)); 1199 if (entry == NULL) 1200 return -ENOENT; 1201 1202 /* rcu lock already held from nfnl->call_rcu. */ 1203 nfnl_ct = rcu_dereference(nfnl_ct_hook); 1204 1205 if (nfqa[NFQA_CT]) { 1206 if (nfnl_ct != NULL) 1207 ct = nfqnl_ct_parse(nfnl_ct, nlh, nfqa, entry, &ctinfo); 1208 } 1209 1210 if (entry->state.pf == PF_BRIDGE) { 1211 err = nfqa_parse_bridge(entry, nfqa); 1212 if (err < 0) 1213 return err; 1214 } 1215 1216 if (nfqa[NFQA_PAYLOAD]) { 1217 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); 1218 int diff = payload_len - entry->skb->len; 1219 1220 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), 1221 payload_len, entry, diff) < 0) 1222 verdict = NF_DROP; 1223 1224 if (ct && diff) 1225 nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff); 1226 } 1227 1228 if (nfqa[NFQA_MARK]) 1229 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); 1230 1231 nfqnl_reinject(entry, verdict); 1232 return 0; 1233 } 1234 1235 static int nfqnl_recv_unsupp(struct net *net, struct sock *ctnl, 1236 struct sk_buff *skb, const struct nlmsghdr *nlh, 1237 const struct nlattr * const nfqa[], 1238 struct netlink_ext_ack *extack) 1239 { 1240 return -ENOTSUPP; 1241 } 1242 1243 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { 1244 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, 1245 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, 1246 }; 1247 1248 static const struct nf_queue_handler nfqh = { 1249 .outfn = nfqnl_enqueue_packet, 1250 .nf_hook_drop = nfqnl_nf_hook_drop, 1251 }; 1252 1253 static int nfqnl_recv_config(struct net *net, struct sock *ctnl, 1254 struct sk_buff *skb, const struct nlmsghdr *nlh, 1255 const struct nlattr * const nfqa[], 1256 struct netlink_ext_ack *extack) 1257 { 1258 struct nfgenmsg *nfmsg = nlmsg_data(nlh); 1259 u_int16_t queue_num = ntohs(nfmsg->res_id); 1260 struct nfqnl_instance *queue; 1261 struct nfqnl_msg_config_cmd *cmd = NULL; 1262 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1263 __u32 flags = 0, mask = 0; 1264 int ret = 0; 1265 1266 if (nfqa[NFQA_CFG_CMD]) { 1267 cmd = nla_data(nfqa[NFQA_CFG_CMD]); 1268 1269 /* Obsolete commands without queue context */ 1270 switch (cmd->command) { 1271 case NFQNL_CFG_CMD_PF_BIND: return 0; 1272 case NFQNL_CFG_CMD_PF_UNBIND: return 0; 1273 } 1274 } 1275 1276 /* Check if we support these flags in first place, dependencies should 1277 * be there too not to break atomicity. 1278 */ 1279 if (nfqa[NFQA_CFG_FLAGS]) { 1280 if (!nfqa[NFQA_CFG_MASK]) { 1281 /* A mask is needed to specify which flags are being 1282 * changed. 1283 */ 1284 return -EINVAL; 1285 } 1286 1287 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); 1288 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); 1289 1290 if (flags >= NFQA_CFG_F_MAX) 1291 return -EOPNOTSUPP; 1292 1293 #if !IS_ENABLED(CONFIG_NETWORK_SECMARK) 1294 if (flags & mask & NFQA_CFG_F_SECCTX) 1295 return -EOPNOTSUPP; 1296 #endif 1297 if ((flags & mask & NFQA_CFG_F_CONNTRACK) && 1298 !rcu_access_pointer(nfnl_ct_hook)) { 1299 #ifdef CONFIG_MODULES 1300 nfnl_unlock(NFNL_SUBSYS_QUEUE); 1301 request_module("ip_conntrack_netlink"); 1302 nfnl_lock(NFNL_SUBSYS_QUEUE); 1303 if (rcu_access_pointer(nfnl_ct_hook)) 1304 return -EAGAIN; 1305 #endif 1306 return -EOPNOTSUPP; 1307 } 1308 } 1309 1310 rcu_read_lock(); 1311 queue = instance_lookup(q, queue_num); 1312 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { 1313 ret = -EPERM; 1314 goto err_out_unlock; 1315 } 1316 1317 if (cmd != NULL) { 1318 switch (cmd->command) { 1319 case NFQNL_CFG_CMD_BIND: 1320 if (queue) { 1321 ret = -EBUSY; 1322 goto err_out_unlock; 1323 } 1324 queue = instance_create(q, queue_num, 1325 NETLINK_CB(skb).portid); 1326 if (IS_ERR(queue)) { 1327 ret = PTR_ERR(queue); 1328 goto err_out_unlock; 1329 } 1330 break; 1331 case NFQNL_CFG_CMD_UNBIND: 1332 if (!queue) { 1333 ret = -ENODEV; 1334 goto err_out_unlock; 1335 } 1336 instance_destroy(q, queue); 1337 goto err_out_unlock; 1338 case NFQNL_CFG_CMD_PF_BIND: 1339 case NFQNL_CFG_CMD_PF_UNBIND: 1340 break; 1341 default: 1342 ret = -ENOTSUPP; 1343 goto err_out_unlock; 1344 } 1345 } 1346 1347 if (!queue) { 1348 ret = -ENODEV; 1349 goto err_out_unlock; 1350 } 1351 1352 if (nfqa[NFQA_CFG_PARAMS]) { 1353 struct nfqnl_msg_config_params *params = 1354 nla_data(nfqa[NFQA_CFG_PARAMS]); 1355 1356 nfqnl_set_mode(queue, params->copy_mode, 1357 ntohl(params->copy_range)); 1358 } 1359 1360 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { 1361 __be32 *queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); 1362 1363 spin_lock_bh(&queue->lock); 1364 queue->queue_maxlen = ntohl(*queue_maxlen); 1365 spin_unlock_bh(&queue->lock); 1366 } 1367 1368 if (nfqa[NFQA_CFG_FLAGS]) { 1369 spin_lock_bh(&queue->lock); 1370 queue->flags &= ~mask; 1371 queue->flags |= flags & mask; 1372 spin_unlock_bh(&queue->lock); 1373 } 1374 1375 err_out_unlock: 1376 rcu_read_unlock(); 1377 return ret; 1378 } 1379 1380 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { 1381 [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, 1382 .attr_count = NFQA_MAX, }, 1383 [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, 1384 .attr_count = NFQA_MAX, 1385 .policy = nfqa_verdict_policy }, 1386 [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, 1387 .attr_count = NFQA_CFG_MAX, 1388 .policy = nfqa_cfg_policy }, 1389 [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, 1390 .attr_count = NFQA_MAX, 1391 .policy = nfqa_verdict_batch_policy }, 1392 }; 1393 1394 static const struct nfnetlink_subsystem nfqnl_subsys = { 1395 .name = "nf_queue", 1396 .subsys_id = NFNL_SUBSYS_QUEUE, 1397 .cb_count = NFQNL_MSG_MAX, 1398 .cb = nfqnl_cb, 1399 }; 1400 1401 #ifdef CONFIG_PROC_FS 1402 struct iter_state { 1403 struct seq_net_private p; 1404 unsigned int bucket; 1405 }; 1406 1407 static struct hlist_node *get_first(struct seq_file *seq) 1408 { 1409 struct iter_state *st = seq->private; 1410 struct net *net; 1411 struct nfnl_queue_net *q; 1412 1413 if (!st) 1414 return NULL; 1415 1416 net = seq_file_net(seq); 1417 q = nfnl_queue_pernet(net); 1418 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { 1419 if (!hlist_empty(&q->instance_table[st->bucket])) 1420 return q->instance_table[st->bucket].first; 1421 } 1422 return NULL; 1423 } 1424 1425 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) 1426 { 1427 struct iter_state *st = seq->private; 1428 struct net *net = seq_file_net(seq); 1429 1430 h = h->next; 1431 while (!h) { 1432 struct nfnl_queue_net *q; 1433 1434 if (++st->bucket >= INSTANCE_BUCKETS) 1435 return NULL; 1436 1437 q = nfnl_queue_pernet(net); 1438 h = q->instance_table[st->bucket].first; 1439 } 1440 return h; 1441 } 1442 1443 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) 1444 { 1445 struct hlist_node *head; 1446 head = get_first(seq); 1447 1448 if (head) 1449 while (pos && (head = get_next(seq, head))) 1450 pos--; 1451 return pos ? NULL : head; 1452 } 1453 1454 static void *seq_start(struct seq_file *s, loff_t *pos) 1455 __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) 1456 { 1457 spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); 1458 return get_idx(s, *pos); 1459 } 1460 1461 static void *seq_next(struct seq_file *s, void *v, loff_t *pos) 1462 { 1463 (*pos)++; 1464 return get_next(s, v); 1465 } 1466 1467 static void seq_stop(struct seq_file *s, void *v) 1468 __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) 1469 { 1470 spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); 1471 } 1472 1473 static int seq_show(struct seq_file *s, void *v) 1474 { 1475 const struct nfqnl_instance *inst = v; 1476 1477 seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n", 1478 inst->queue_num, 1479 inst->peer_portid, inst->queue_total, 1480 inst->copy_mode, inst->copy_range, 1481 inst->queue_dropped, inst->queue_user_dropped, 1482 inst->id_sequence, 1); 1483 return 0; 1484 } 1485 1486 static const struct seq_operations nfqnl_seq_ops = { 1487 .start = seq_start, 1488 .next = seq_next, 1489 .stop = seq_stop, 1490 .show = seq_show, 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_net("nfnetlink_queue", 0440, net->nf.proc_netfilter, 1506 &nfqnl_seq_ops, sizeof(struct iter_state))) 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 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1516 unsigned int i; 1517 1518 nf_unregister_queue_handler(net); 1519 #ifdef CONFIG_PROC_FS 1520 remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); 1521 #endif 1522 for (i = 0; i < INSTANCE_BUCKETS; i++) 1523 WARN_ON_ONCE(!hlist_empty(&q->instance_table[i])); 1524 } 1525 1526 static void nfnl_queue_net_exit_batch(struct list_head *net_exit_list) 1527 { 1528 synchronize_rcu(); 1529 } 1530 1531 static struct pernet_operations nfnl_queue_net_ops = { 1532 .init = nfnl_queue_net_init, 1533 .exit = nfnl_queue_net_exit, 1534 .exit_batch = nfnl_queue_net_exit_batch, 1535 .id = &nfnl_queue_net_id, 1536 .size = sizeof(struct nfnl_queue_net), 1537 }; 1538 1539 static int __init nfnetlink_queue_init(void) 1540 { 1541 int status; 1542 1543 status = register_pernet_subsys(&nfnl_queue_net_ops); 1544 if (status < 0) { 1545 pr_err("failed to register pernet ops\n"); 1546 goto out; 1547 } 1548 1549 netlink_register_notifier(&nfqnl_rtnl_notifier); 1550 status = nfnetlink_subsys_register(&nfqnl_subsys); 1551 if (status < 0) { 1552 pr_err("failed to create netlink socket\n"); 1553 goto cleanup_netlink_notifier; 1554 } 1555 1556 status = register_netdevice_notifier(&nfqnl_dev_notifier); 1557 if (status < 0) { 1558 pr_err("failed to register netdevice notifier\n"); 1559 goto cleanup_netlink_subsys; 1560 } 1561 1562 return status; 1563 1564 cleanup_netlink_subsys: 1565 nfnetlink_subsys_unregister(&nfqnl_subsys); 1566 cleanup_netlink_notifier: 1567 netlink_unregister_notifier(&nfqnl_rtnl_notifier); 1568 unregister_pernet_subsys(&nfnl_queue_net_ops); 1569 out: 1570 return status; 1571 } 1572 1573 static void __exit nfnetlink_queue_fini(void) 1574 { 1575 unregister_netdevice_notifier(&nfqnl_dev_notifier); 1576 nfnetlink_subsys_unregister(&nfqnl_subsys); 1577 netlink_unregister_notifier(&nfqnl_rtnl_notifier); 1578 unregister_pernet_subsys(&nfnl_queue_net_ops); 1579 1580 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1581 } 1582 1583 MODULE_DESCRIPTION("netfilter packet queue handler"); 1584 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); 1585 MODULE_LICENSE("GPL"); 1586 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); 1587 1588 module_init(nfnetlink_queue_init); 1589 module_exit(nfnetlink_queue_fini); 1590