1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * This is a module which is used for queueing packets and communicating with 4 * userspace via nfnetlink. 5 * 6 * (C) 2005 by Harald Welte <laforge@netfilter.org> 7 * (C) 2007 by Patrick McHardy <kaber@trash.net> 8 * 9 * Based on the old ipv4-only ip_queue.c: 10 * (C) 2000-2002 James Morris <jmorris@intercode.com.au> 11 * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org> 12 */ 13 14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 15 16 #include <linux/module.h> 17 #include <linux/skbuff.h> 18 #include <linux/init.h> 19 #include <linux/spinlock.h> 20 #include <linux/slab.h> 21 #include <linux/notifier.h> 22 #include <linux/netdevice.h> 23 #include <linux/netfilter.h> 24 #include <linux/proc_fs.h> 25 #include <linux/netfilter_ipv4.h> 26 #include <linux/netfilter_ipv6.h> 27 #include <linux/netfilter_bridge.h> 28 #include <linux/netfilter/nfnetlink.h> 29 #include <linux/netfilter/nfnetlink_queue.h> 30 #include <linux/netfilter/nf_conntrack_common.h> 31 #include <linux/list.h> 32 #include <net/sock.h> 33 #include <net/tcp_states.h> 34 #include <net/netfilter/nf_queue.h> 35 #include <net/netns/generic.h> 36 37 #include <linux/atomic.h> 38 39 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 40 #include "../bridge/br_private.h" 41 #endif 42 43 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 44 #include <net/netfilter/nf_conntrack.h> 45 #endif 46 47 #define NFQNL_QMAX_DEFAULT 1024 48 49 /* We're using struct nlattr which has 16bit nla_len. Note that nla_len 50 * includes the header length. Thus, the maximum packet length that we 51 * support is 65531 bytes. We send truncated packets if the specified length 52 * is larger than that. Userspace can check for presence of NFQA_CAP_LEN 53 * attribute to detect truncation. 54 */ 55 #define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN) 56 57 struct nfqnl_instance { 58 struct hlist_node hlist; /* global list of queues */ 59 struct rcu_head rcu; 60 61 u32 peer_portid; 62 unsigned int queue_maxlen; 63 unsigned int copy_range; 64 unsigned int queue_dropped; 65 unsigned int queue_user_dropped; 66 67 68 u_int16_t queue_num; /* number of this queue */ 69 u_int8_t copy_mode; 70 u_int32_t flags; /* Set using NFQA_CFG_FLAGS */ 71 /* 72 * Following fields are dirtied for each queued packet, 73 * keep them in same cache line if possible. 74 */ 75 spinlock_t lock ____cacheline_aligned_in_smp; 76 unsigned int queue_total; 77 unsigned int id_sequence; /* 'sequence' of pkt ids */ 78 struct list_head queue_list; /* packets in queue */ 79 }; 80 81 typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long); 82 83 static unsigned int nfnl_queue_net_id __read_mostly; 84 85 #define INSTANCE_BUCKETS 16 86 struct nfnl_queue_net { 87 spinlock_t instances_lock; 88 struct hlist_head instance_table[INSTANCE_BUCKETS]; 89 }; 90 91 static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net) 92 { 93 return net_generic(net, nfnl_queue_net_id); 94 } 95 96 static inline u_int8_t instance_hashfn(u_int16_t queue_num) 97 { 98 return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS; 99 } 100 101 static struct nfqnl_instance * 102 instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num) 103 { 104 struct hlist_head *head; 105 struct nfqnl_instance *inst; 106 107 head = &q->instance_table[instance_hashfn(queue_num)]; 108 hlist_for_each_entry_rcu(inst, head, hlist) { 109 if (inst->queue_num == queue_num) 110 return inst; 111 } 112 return NULL; 113 } 114 115 static struct nfqnl_instance * 116 instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, u32 portid) 117 { 118 struct nfqnl_instance *inst; 119 unsigned int h; 120 int err; 121 122 spin_lock(&q->instances_lock); 123 if (instance_lookup(q, queue_num)) { 124 err = -EEXIST; 125 goto out_unlock; 126 } 127 128 inst = kzalloc(sizeof(*inst), GFP_ATOMIC); 129 if (!inst) { 130 err = -ENOMEM; 131 goto out_unlock; 132 } 133 134 inst->queue_num = queue_num; 135 inst->peer_portid = portid; 136 inst->queue_maxlen = NFQNL_QMAX_DEFAULT; 137 inst->copy_range = NFQNL_MAX_COPY_RANGE; 138 inst->copy_mode = NFQNL_COPY_NONE; 139 spin_lock_init(&inst->lock); 140 INIT_LIST_HEAD(&inst->queue_list); 141 142 if (!try_module_get(THIS_MODULE)) { 143 err = -EAGAIN; 144 goto out_free; 145 } 146 147 h = instance_hashfn(queue_num); 148 hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]); 149 150 spin_unlock(&q->instances_lock); 151 152 return inst; 153 154 out_free: 155 kfree(inst); 156 out_unlock: 157 spin_unlock(&q->instances_lock); 158 return ERR_PTR(err); 159 } 160 161 static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, 162 unsigned long data); 163 164 static void 165 instance_destroy_rcu(struct rcu_head *head) 166 { 167 struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance, 168 rcu); 169 170 nfqnl_flush(inst, NULL, 0); 171 kfree(inst); 172 module_put(THIS_MODULE); 173 } 174 175 static void 176 __instance_destroy(struct nfqnl_instance *inst) 177 { 178 hlist_del_rcu(&inst->hlist); 179 call_rcu(&inst->rcu, instance_destroy_rcu); 180 } 181 182 static void 183 instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst) 184 { 185 spin_lock(&q->instances_lock); 186 __instance_destroy(inst); 187 spin_unlock(&q->instances_lock); 188 } 189 190 static inline void 191 __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) 192 { 193 list_add_tail(&entry->list, &queue->queue_list); 194 queue->queue_total++; 195 } 196 197 static void 198 __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) 199 { 200 list_del(&entry->list); 201 queue->queue_total--; 202 } 203 204 static struct nf_queue_entry * 205 find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id) 206 { 207 struct nf_queue_entry *entry = NULL, *i; 208 209 spin_lock_bh(&queue->lock); 210 211 list_for_each_entry(i, &queue->queue_list, list) { 212 if (i->id == id) { 213 entry = i; 214 break; 215 } 216 } 217 218 if (entry) 219 __dequeue_entry(queue, entry); 220 221 spin_unlock_bh(&queue->lock); 222 223 return entry; 224 } 225 226 static void nfqnl_reinject(struct nf_queue_entry *entry, unsigned int verdict) 227 { 228 const struct nf_ct_hook *ct_hook; 229 int err; 230 231 if (verdict == NF_ACCEPT || 232 verdict == NF_REPEAT || 233 verdict == NF_STOP) { 234 rcu_read_lock(); 235 ct_hook = rcu_dereference(nf_ct_hook); 236 if (ct_hook) { 237 err = ct_hook->update(entry->state.net, entry->skb); 238 if (err < 0) 239 verdict = NF_DROP; 240 } 241 rcu_read_unlock(); 242 } 243 nf_reinject(entry, verdict); 244 } 245 246 static void 247 nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) 248 { 249 struct nf_queue_entry *entry, *next; 250 251 spin_lock_bh(&queue->lock); 252 list_for_each_entry_safe(entry, next, &queue->queue_list, list) { 253 if (!cmpfn || cmpfn(entry, data)) { 254 list_del(&entry->list); 255 queue->queue_total--; 256 nfqnl_reinject(entry, NF_DROP); 257 } 258 } 259 spin_unlock_bh(&queue->lock); 260 } 261 262 static int 263 nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet, 264 bool csum_verify) 265 { 266 __u32 flags = 0; 267 268 if (packet->ip_summed == CHECKSUM_PARTIAL) 269 flags = NFQA_SKB_CSUMNOTREADY; 270 else if (csum_verify) 271 flags = NFQA_SKB_CSUM_NOTVERIFIED; 272 273 if (skb_is_gso(packet)) 274 flags |= NFQA_SKB_GSO; 275 276 return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0; 277 } 278 279 static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk) 280 { 281 const struct cred *cred; 282 283 if (!sk_fullsock(sk)) 284 return 0; 285 286 read_lock_bh(&sk->sk_callback_lock); 287 if (sk->sk_socket && sk->sk_socket->file) { 288 cred = sk->sk_socket->file->f_cred; 289 if (nla_put_be32(skb, NFQA_UID, 290 htonl(from_kuid_munged(&init_user_ns, cred->fsuid)))) 291 goto nla_put_failure; 292 if (nla_put_be32(skb, NFQA_GID, 293 htonl(from_kgid_munged(&init_user_ns, cred->fsgid)))) 294 goto nla_put_failure; 295 } 296 read_unlock_bh(&sk->sk_callback_lock); 297 return 0; 298 299 nla_put_failure: 300 read_unlock_bh(&sk->sk_callback_lock); 301 return -1; 302 } 303 304 static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata) 305 { 306 u32 seclen = 0; 307 #if IS_ENABLED(CONFIG_NETWORK_SECMARK) 308 if (!skb || !sk_fullsock(skb->sk)) 309 return 0; 310 311 read_lock_bh(&skb->sk->sk_callback_lock); 312 313 if (skb->secmark) 314 security_secid_to_secctx(skb->secmark, secdata, &seclen); 315 316 read_unlock_bh(&skb->sk->sk_callback_lock); 317 #endif 318 return seclen; 319 } 320 321 static u32 nfqnl_get_bridge_size(struct nf_queue_entry *entry) 322 { 323 struct sk_buff *entskb = entry->skb; 324 u32 nlalen = 0; 325 326 if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb)) 327 return 0; 328 329 if (skb_vlan_tag_present(entskb)) 330 nlalen += nla_total_size(nla_total_size(sizeof(__be16)) + 331 nla_total_size(sizeof(__be16))); 332 333 if (entskb->network_header > entskb->mac_header) 334 nlalen += nla_total_size((entskb->network_header - 335 entskb->mac_header)); 336 337 return nlalen; 338 } 339 340 static int nfqnl_put_bridge(struct nf_queue_entry *entry, struct sk_buff *skb) 341 { 342 struct sk_buff *entskb = entry->skb; 343 344 if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb)) 345 return 0; 346 347 if (skb_vlan_tag_present(entskb)) { 348 struct nlattr *nest; 349 350 nest = nla_nest_start(skb, NFQA_VLAN); 351 if (!nest) 352 goto nla_put_failure; 353 354 if (nla_put_be16(skb, NFQA_VLAN_TCI, htons(entskb->vlan_tci)) || 355 nla_put_be16(skb, NFQA_VLAN_PROTO, entskb->vlan_proto)) 356 goto nla_put_failure; 357 358 nla_nest_end(skb, nest); 359 } 360 361 if (entskb->mac_header < entskb->network_header) { 362 int len = (int)(entskb->network_header - entskb->mac_header); 363 364 if (nla_put(skb, NFQA_L2HDR, len, skb_mac_header(entskb))) 365 goto nla_put_failure; 366 } 367 368 return 0; 369 370 nla_put_failure: 371 return -1; 372 } 373 374 static struct sk_buff * 375 nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, 376 struct nf_queue_entry *entry, 377 __be32 **packet_id_ptr) 378 { 379 size_t size; 380 size_t data_len = 0, cap_len = 0; 381 unsigned int hlen = 0; 382 struct sk_buff *skb; 383 struct nlattr *nla; 384 struct nfqnl_msg_packet_hdr *pmsg; 385 struct nlmsghdr *nlh; 386 struct sk_buff *entskb = entry->skb; 387 struct net_device *indev; 388 struct net_device *outdev; 389 struct nf_conn *ct = NULL; 390 enum ip_conntrack_info ctinfo = 0; 391 const struct nfnl_ct_hook *nfnl_ct; 392 bool csum_verify; 393 char *secdata = NULL; 394 u32 seclen = 0; 395 396 size = nlmsg_total_size(sizeof(struct nfgenmsg)) 397 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) 398 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 399 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 400 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 401 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 402 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 403 #endif 404 + nla_total_size(sizeof(u_int32_t)) /* mark */ 405 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) 406 + nla_total_size(sizeof(u_int32_t)) /* skbinfo */ 407 + nla_total_size(sizeof(u_int32_t)); /* cap_len */ 408 409 if (entskb->tstamp) 410 size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); 411 412 size += nfqnl_get_bridge_size(entry); 413 414 if (entry->state.hook <= NF_INET_FORWARD || 415 (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL)) 416 csum_verify = !skb_csum_unnecessary(entskb); 417 else 418 csum_verify = false; 419 420 outdev = entry->state.out; 421 422 switch ((enum nfqnl_config_mode)READ_ONCE(queue->copy_mode)) { 423 case NFQNL_COPY_META: 424 case NFQNL_COPY_NONE: 425 break; 426 427 case NFQNL_COPY_PACKET: 428 if (!(queue->flags & NFQA_CFG_F_GSO) && 429 entskb->ip_summed == CHECKSUM_PARTIAL && 430 skb_checksum_help(entskb)) 431 return NULL; 432 433 data_len = READ_ONCE(queue->copy_range); 434 if (data_len > entskb->len) 435 data_len = entskb->len; 436 437 hlen = skb_zerocopy_headlen(entskb); 438 hlen = min_t(unsigned int, hlen, data_len); 439 size += sizeof(struct nlattr) + hlen; 440 cap_len = entskb->len; 441 break; 442 } 443 444 nfnl_ct = rcu_dereference(nfnl_ct_hook); 445 446 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 447 if (queue->flags & NFQA_CFG_F_CONNTRACK) { 448 if (nfnl_ct != NULL) { 449 ct = nf_ct_get(entskb, &ctinfo); 450 if (ct != NULL) 451 size += nfnl_ct->build_size(ct); 452 } 453 } 454 #endif 455 456 if (queue->flags & NFQA_CFG_F_UID_GID) { 457 size += (nla_total_size(sizeof(u_int32_t)) /* uid */ 458 + nla_total_size(sizeof(u_int32_t))); /* gid */ 459 } 460 461 if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) { 462 seclen = nfqnl_get_sk_secctx(entskb, &secdata); 463 if (seclen) 464 size += nla_total_size(seclen); 465 } 466 467 skb = alloc_skb(size, GFP_ATOMIC); 468 if (!skb) { 469 skb_tx_error(entskb); 470 goto nlmsg_failure; 471 } 472 473 nlh = nfnl_msg_put(skb, 0, 0, 474 nfnl_msg_type(NFNL_SUBSYS_QUEUE, NFQNL_MSG_PACKET), 475 0, entry->state.pf, NFNETLINK_V0, 476 htons(queue->queue_num)); 477 if (!nlh) { 478 skb_tx_error(entskb); 479 kfree_skb(skb); 480 goto nlmsg_failure; 481 } 482 483 nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); 484 pmsg = nla_data(nla); 485 pmsg->hw_protocol = entskb->protocol; 486 pmsg->hook = entry->state.hook; 487 *packet_id_ptr = &pmsg->packet_id; 488 489 indev = entry->state.in; 490 if (indev) { 491 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 492 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) 493 goto nla_put_failure; 494 #else 495 if (entry->state.pf == PF_BRIDGE) { 496 /* Case 1: indev is physical input device, we need to 497 * look for bridge group (when called from 498 * netfilter_bridge) */ 499 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, 500 htonl(indev->ifindex)) || 501 /* this is the bridge group "brX" */ 502 /* rcu_read_lock()ed by __nf_queue */ 503 nla_put_be32(skb, NFQA_IFINDEX_INDEV, 504 htonl(br_port_get_rcu(indev)->br->dev->ifindex))) 505 goto nla_put_failure; 506 } else { 507 int physinif; 508 509 /* Case 2: indev is bridge group, we need to look for 510 * physical device (when called from ipv4) */ 511 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, 512 htonl(indev->ifindex))) 513 goto nla_put_failure; 514 515 physinif = nf_bridge_get_physinif(entskb); 516 if (physinif && 517 nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, 518 htonl(physinif))) 519 goto nla_put_failure; 520 } 521 #endif 522 } 523 524 if (outdev) { 525 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 526 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) 527 goto nla_put_failure; 528 #else 529 if (entry->state.pf == PF_BRIDGE) { 530 /* Case 1: outdev is physical output device, we need to 531 * look for bridge group (when called from 532 * netfilter_bridge) */ 533 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, 534 htonl(outdev->ifindex)) || 535 /* this is the bridge group "brX" */ 536 /* rcu_read_lock()ed by __nf_queue */ 537 nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, 538 htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) 539 goto nla_put_failure; 540 } else { 541 int physoutif; 542 543 /* Case 2: outdev is bridge group, we need to look for 544 * physical output device (when called from ipv4) */ 545 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, 546 htonl(outdev->ifindex))) 547 goto nla_put_failure; 548 549 physoutif = nf_bridge_get_physoutif(entskb); 550 if (physoutif && 551 nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, 552 htonl(physoutif))) 553 goto nla_put_failure; 554 } 555 #endif 556 } 557 558 if (entskb->mark && 559 nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) 560 goto nla_put_failure; 561 562 if (indev && entskb->dev && 563 skb_mac_header_was_set(entskb) && 564 skb_mac_header_len(entskb) != 0) { 565 struct nfqnl_msg_packet_hw phw; 566 int len; 567 568 memset(&phw, 0, sizeof(phw)); 569 len = dev_parse_header(entskb, phw.hw_addr); 570 if (len) { 571 phw.hw_addrlen = htons(len); 572 if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) 573 goto nla_put_failure; 574 } 575 } 576 577 if (nfqnl_put_bridge(entry, skb) < 0) 578 goto nla_put_failure; 579 580 if (entry->state.hook <= NF_INET_FORWARD && entskb->tstamp) { 581 struct nfqnl_msg_packet_timestamp ts; 582 struct timespec64 kts = ktime_to_timespec64(entskb->tstamp); 583 584 ts.sec = cpu_to_be64(kts.tv_sec); 585 ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC); 586 587 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) 588 goto nla_put_failure; 589 } 590 591 if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk && 592 nfqnl_put_sk_uidgid(skb, entskb->sk) < 0) 593 goto nla_put_failure; 594 595 if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata)) 596 goto nla_put_failure; 597 598 if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0) 599 goto nla_put_failure; 600 601 if (cap_len > data_len && 602 nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) 603 goto nla_put_failure; 604 605 if (nfqnl_put_packet_info(skb, entskb, csum_verify)) 606 goto nla_put_failure; 607 608 if (data_len) { 609 struct nlattr *nla; 610 611 if (skb_tailroom(skb) < sizeof(*nla) + hlen) 612 goto nla_put_failure; 613 614 nla = skb_put(skb, sizeof(*nla)); 615 nla->nla_type = NFQA_PAYLOAD; 616 nla->nla_len = nla_attr_size(data_len); 617 618 if (skb_zerocopy(skb, entskb, data_len, hlen)) 619 goto nla_put_failure; 620 } 621 622 nlh->nlmsg_len = skb->len; 623 if (seclen) 624 security_release_secctx(secdata, seclen); 625 return skb; 626 627 nla_put_failure: 628 skb_tx_error(entskb); 629 kfree_skb(skb); 630 net_err_ratelimited("nf_queue: error creating packet message\n"); 631 nlmsg_failure: 632 if (seclen) 633 security_release_secctx(secdata, seclen); 634 return NULL; 635 } 636 637 static bool nf_ct_drop_unconfirmed(const struct nf_queue_entry *entry) 638 { 639 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 640 static const unsigned long flags = IPS_CONFIRMED | IPS_DYING; 641 const struct nf_conn *ct = (void *)skb_nfct(entry->skb); 642 643 if (ct && ((ct->status & flags) == IPS_DYING)) 644 return true; 645 #endif 646 return false; 647 } 648 649 static int 650 __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, 651 struct nf_queue_entry *entry) 652 { 653 struct sk_buff *nskb; 654 int err = -ENOBUFS; 655 __be32 *packet_id_ptr; 656 int failopen = 0; 657 658 nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr); 659 if (nskb == NULL) { 660 err = -ENOMEM; 661 goto err_out; 662 } 663 spin_lock_bh(&queue->lock); 664 665 if (nf_ct_drop_unconfirmed(entry)) 666 goto err_out_free_nskb; 667 668 if (queue->queue_total >= queue->queue_maxlen) { 669 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { 670 failopen = 1; 671 err = 0; 672 } else { 673 queue->queue_dropped++; 674 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", 675 queue->queue_total); 676 } 677 goto err_out_free_nskb; 678 } 679 entry->id = ++queue->id_sequence; 680 *packet_id_ptr = htonl(entry->id); 681 682 /* nfnetlink_unicast will either free the nskb or add it to a socket */ 683 err = nfnetlink_unicast(nskb, net, queue->peer_portid); 684 if (err < 0) { 685 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { 686 failopen = 1; 687 err = 0; 688 } else { 689 queue->queue_user_dropped++; 690 } 691 goto err_out_unlock; 692 } 693 694 __enqueue_entry(queue, entry); 695 696 spin_unlock_bh(&queue->lock); 697 return 0; 698 699 err_out_free_nskb: 700 kfree_skb(nskb); 701 err_out_unlock: 702 spin_unlock_bh(&queue->lock); 703 if (failopen) 704 nfqnl_reinject(entry, NF_ACCEPT); 705 err_out: 706 return err; 707 } 708 709 static struct nf_queue_entry * 710 nf_queue_entry_dup(struct nf_queue_entry *e) 711 { 712 struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); 713 714 if (!entry) 715 return NULL; 716 717 if (nf_queue_entry_get_refs(entry)) 718 return entry; 719 720 kfree(entry); 721 return NULL; 722 } 723 724 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 725 /* When called from bridge netfilter, skb->data must point to MAC header 726 * before calling skb_gso_segment(). Else, original MAC header is lost 727 * and segmented skbs will be sent to wrong destination. 728 */ 729 static void nf_bridge_adjust_skb_data(struct sk_buff *skb) 730 { 731 if (nf_bridge_info_get(skb)) 732 __skb_push(skb, skb->network_header - skb->mac_header); 733 } 734 735 static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) 736 { 737 if (nf_bridge_info_get(skb)) 738 __skb_pull(skb, skb->network_header - skb->mac_header); 739 } 740 #else 741 #define nf_bridge_adjust_skb_data(s) do {} while (0) 742 #define nf_bridge_adjust_segmented_data(s) do {} while (0) 743 #endif 744 745 static int 746 __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue, 747 struct sk_buff *skb, struct nf_queue_entry *entry) 748 { 749 int ret = -ENOMEM; 750 struct nf_queue_entry *entry_seg; 751 752 nf_bridge_adjust_segmented_data(skb); 753 754 if (skb->next == NULL) { /* last packet, no need to copy entry */ 755 struct sk_buff *gso_skb = entry->skb; 756 entry->skb = skb; 757 ret = __nfqnl_enqueue_packet(net, queue, entry); 758 if (ret) 759 entry->skb = gso_skb; 760 return ret; 761 } 762 763 skb_mark_not_on_list(skb); 764 765 entry_seg = nf_queue_entry_dup(entry); 766 if (entry_seg) { 767 entry_seg->skb = skb; 768 ret = __nfqnl_enqueue_packet(net, queue, entry_seg); 769 if (ret) 770 nf_queue_entry_free(entry_seg); 771 } 772 return ret; 773 } 774 775 static int 776 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) 777 { 778 unsigned int queued; 779 struct nfqnl_instance *queue; 780 struct sk_buff *skb, *segs, *nskb; 781 int err = -ENOBUFS; 782 struct net *net = entry->state.net; 783 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 784 785 /* rcu_read_lock()ed by nf_hook_thresh */ 786 queue = instance_lookup(q, queuenum); 787 if (!queue) 788 return -ESRCH; 789 790 if (queue->copy_mode == NFQNL_COPY_NONE) 791 return -EINVAL; 792 793 skb = entry->skb; 794 795 switch (entry->state.pf) { 796 case NFPROTO_IPV4: 797 skb->protocol = htons(ETH_P_IP); 798 break; 799 case NFPROTO_IPV6: 800 skb->protocol = htons(ETH_P_IPV6); 801 break; 802 } 803 804 if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb)) 805 return __nfqnl_enqueue_packet(net, queue, entry); 806 807 nf_bridge_adjust_skb_data(skb); 808 segs = skb_gso_segment(skb, 0); 809 /* Does not use PTR_ERR to limit the number of error codes that can be 810 * returned by nf_queue. For instance, callers rely on -ESRCH to 811 * mean 'ignore this hook'. 812 */ 813 if (IS_ERR_OR_NULL(segs)) 814 goto out_err; 815 queued = 0; 816 err = 0; 817 skb_list_walk_safe(segs, segs, nskb) { 818 if (err == 0) 819 err = __nfqnl_enqueue_packet_gso(net, queue, 820 segs, entry); 821 if (err == 0) 822 queued++; 823 else 824 kfree_skb(segs); 825 } 826 827 if (queued) { 828 if (err) /* some segments are already queued */ 829 nf_queue_entry_free(entry); 830 kfree_skb(skb); 831 return 0; 832 } 833 out_err: 834 nf_bridge_adjust_segmented_data(skb); 835 return err; 836 } 837 838 static int 839 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) 840 { 841 struct sk_buff *nskb; 842 843 if (diff < 0) { 844 if (pskb_trim(e->skb, data_len)) 845 return -ENOMEM; 846 } else if (diff > 0) { 847 if (data_len > 0xFFFF) 848 return -EINVAL; 849 if (diff > skb_tailroom(e->skb)) { 850 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), 851 diff, GFP_ATOMIC); 852 if (!nskb) 853 return -ENOMEM; 854 kfree_skb(e->skb); 855 e->skb = nskb; 856 } 857 skb_put(e->skb, diff); 858 } 859 if (skb_ensure_writable(e->skb, data_len)) 860 return -ENOMEM; 861 skb_copy_to_linear_data(e->skb, data, data_len); 862 e->skb->ip_summed = CHECKSUM_NONE; 863 return 0; 864 } 865 866 static int 867 nfqnl_set_mode(struct nfqnl_instance *queue, 868 unsigned char mode, unsigned int range) 869 { 870 int status = 0; 871 872 spin_lock_bh(&queue->lock); 873 switch (mode) { 874 case NFQNL_COPY_NONE: 875 case NFQNL_COPY_META: 876 queue->copy_mode = mode; 877 queue->copy_range = 0; 878 break; 879 880 case NFQNL_COPY_PACKET: 881 queue->copy_mode = mode; 882 if (range == 0 || range > NFQNL_MAX_COPY_RANGE) 883 queue->copy_range = NFQNL_MAX_COPY_RANGE; 884 else 885 queue->copy_range = range; 886 break; 887 888 default: 889 status = -EINVAL; 890 891 } 892 spin_unlock_bh(&queue->lock); 893 894 return status; 895 } 896 897 static int 898 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) 899 { 900 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 901 int physinif, physoutif; 902 903 physinif = nf_bridge_get_physinif(entry->skb); 904 physoutif = nf_bridge_get_physoutif(entry->skb); 905 906 if (physinif == ifindex || physoutif == ifindex) 907 return 1; 908 #endif 909 if (entry->state.in) 910 if (entry->state.in->ifindex == ifindex) 911 return 1; 912 if (entry->state.out) 913 if (entry->state.out->ifindex == ifindex) 914 return 1; 915 916 return 0; 917 } 918 919 /* drop all packets with either indev or outdev == ifindex from all queue 920 * instances */ 921 static void 922 nfqnl_dev_drop(struct net *net, int ifindex) 923 { 924 int i; 925 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 926 927 rcu_read_lock(); 928 929 for (i = 0; i < INSTANCE_BUCKETS; i++) { 930 struct nfqnl_instance *inst; 931 struct hlist_head *head = &q->instance_table[i]; 932 933 hlist_for_each_entry_rcu(inst, head, hlist) 934 nfqnl_flush(inst, dev_cmp, ifindex); 935 } 936 937 rcu_read_unlock(); 938 } 939 940 static int 941 nfqnl_rcv_dev_event(struct notifier_block *this, 942 unsigned long event, void *ptr) 943 { 944 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 945 946 /* Drop any packets associated with the downed device */ 947 if (event == NETDEV_DOWN) 948 nfqnl_dev_drop(dev_net(dev), dev->ifindex); 949 return NOTIFY_DONE; 950 } 951 952 static struct notifier_block nfqnl_dev_notifier = { 953 .notifier_call = nfqnl_rcv_dev_event, 954 }; 955 956 static void nfqnl_nf_hook_drop(struct net *net) 957 { 958 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 959 int i; 960 961 /* This function is also called on net namespace error unwind, 962 * when pernet_ops->init() failed and ->exit() functions of the 963 * previous pernet_ops gets called. 964 * 965 * This may result in a call to nfqnl_nf_hook_drop() before 966 * struct nfnl_queue_net was allocated. 967 */ 968 if (!q) 969 return; 970 971 for (i = 0; i < INSTANCE_BUCKETS; i++) { 972 struct nfqnl_instance *inst; 973 struct hlist_head *head = &q->instance_table[i]; 974 975 hlist_for_each_entry_rcu(inst, head, hlist) 976 nfqnl_flush(inst, NULL, 0); 977 } 978 } 979 980 static int 981 nfqnl_rcv_nl_event(struct notifier_block *this, 982 unsigned long event, void *ptr) 983 { 984 struct netlink_notify *n = ptr; 985 struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); 986 987 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { 988 int i; 989 990 /* destroy all instances for this portid */ 991 spin_lock(&q->instances_lock); 992 for (i = 0; i < INSTANCE_BUCKETS; i++) { 993 struct hlist_node *t2; 994 struct nfqnl_instance *inst; 995 struct hlist_head *head = &q->instance_table[i]; 996 997 hlist_for_each_entry_safe(inst, t2, head, hlist) { 998 if (n->portid == inst->peer_portid) 999 __instance_destroy(inst); 1000 } 1001 } 1002 spin_unlock(&q->instances_lock); 1003 } 1004 return NOTIFY_DONE; 1005 } 1006 1007 static struct notifier_block nfqnl_rtnl_notifier = { 1008 .notifier_call = nfqnl_rcv_nl_event, 1009 }; 1010 1011 static const struct nla_policy nfqa_vlan_policy[NFQA_VLAN_MAX + 1] = { 1012 [NFQA_VLAN_TCI] = { .type = NLA_U16}, 1013 [NFQA_VLAN_PROTO] = { .type = NLA_U16}, 1014 }; 1015 1016 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { 1017 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, 1018 [NFQA_MARK] = { .type = NLA_U32 }, 1019 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, 1020 [NFQA_CT] = { .type = NLA_UNSPEC }, 1021 [NFQA_EXP] = { .type = NLA_UNSPEC }, 1022 [NFQA_VLAN] = { .type = NLA_NESTED }, 1023 }; 1024 1025 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { 1026 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, 1027 [NFQA_MARK] = { .type = NLA_U32 }, 1028 }; 1029 1030 static struct nfqnl_instance * 1031 verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid) 1032 { 1033 struct nfqnl_instance *queue; 1034 1035 queue = instance_lookup(q, queue_num); 1036 if (!queue) 1037 return ERR_PTR(-ENODEV); 1038 1039 if (queue->peer_portid != nlportid) 1040 return ERR_PTR(-EPERM); 1041 1042 return queue; 1043 } 1044 1045 static struct nfqnl_msg_verdict_hdr* 1046 verdicthdr_get(const struct nlattr * const nfqa[]) 1047 { 1048 struct nfqnl_msg_verdict_hdr *vhdr; 1049 unsigned int verdict; 1050 1051 if (!nfqa[NFQA_VERDICT_HDR]) 1052 return NULL; 1053 1054 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); 1055 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; 1056 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) 1057 return NULL; 1058 return vhdr; 1059 } 1060 1061 static int nfq_id_after(unsigned int id, unsigned int max) 1062 { 1063 return (int)(id - max) > 0; 1064 } 1065 1066 static int nfqnl_recv_verdict_batch(struct sk_buff *skb, 1067 const struct nfnl_info *info, 1068 const struct nlattr * const nfqa[]) 1069 { 1070 struct nfnl_queue_net *q = nfnl_queue_pernet(info->net); 1071 u16 queue_num = ntohs(info->nfmsg->res_id); 1072 struct nf_queue_entry *entry, *tmp; 1073 struct nfqnl_msg_verdict_hdr *vhdr; 1074 struct nfqnl_instance *queue; 1075 unsigned int verdict, maxid; 1076 LIST_HEAD(batch_list); 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(const 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 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 1120 struct nf_conn *ct; 1121 1122 ct = nf_ct_get(entry->skb, ctinfo); 1123 if (ct == NULL) 1124 return NULL; 1125 1126 if (nfnl_ct->parse(nfqa[NFQA_CT], ct) < 0) 1127 return NULL; 1128 1129 if (nfqa[NFQA_EXP]) 1130 nfnl_ct->attach_expect(nfqa[NFQA_EXP], ct, 1131 NETLINK_CB(entry->skb).portid, 1132 nlmsg_report(nlh)); 1133 return ct; 1134 #else 1135 return NULL; 1136 #endif 1137 } 1138 1139 static int nfqa_parse_bridge(struct nf_queue_entry *entry, 1140 const struct nlattr * const nfqa[]) 1141 { 1142 if (nfqa[NFQA_VLAN]) { 1143 struct nlattr *tb[NFQA_VLAN_MAX + 1]; 1144 int err; 1145 1146 err = nla_parse_nested_deprecated(tb, NFQA_VLAN_MAX, 1147 nfqa[NFQA_VLAN], 1148 nfqa_vlan_policy, NULL); 1149 if (err < 0) 1150 return err; 1151 1152 if (!tb[NFQA_VLAN_TCI] || !tb[NFQA_VLAN_PROTO]) 1153 return -EINVAL; 1154 1155 __vlan_hwaccel_put_tag(entry->skb, 1156 nla_get_be16(tb[NFQA_VLAN_PROTO]), 1157 ntohs(nla_get_be16(tb[NFQA_VLAN_TCI]))); 1158 } 1159 1160 if (nfqa[NFQA_L2HDR]) { 1161 int mac_header_len = entry->skb->network_header - 1162 entry->skb->mac_header; 1163 1164 if (mac_header_len != nla_len(nfqa[NFQA_L2HDR])) 1165 return -EINVAL; 1166 else if (mac_header_len > 0) 1167 memcpy(skb_mac_header(entry->skb), 1168 nla_data(nfqa[NFQA_L2HDR]), 1169 mac_header_len); 1170 } 1171 1172 return 0; 1173 } 1174 1175 static int nfqnl_recv_verdict(struct sk_buff *skb, const struct nfnl_info *info, 1176 const struct nlattr * const nfqa[]) 1177 { 1178 struct nfnl_queue_net *q = nfnl_queue_pernet(info->net); 1179 u_int16_t queue_num = ntohs(info->nfmsg->res_id); 1180 const struct nfnl_ct_hook *nfnl_ct; 1181 struct nfqnl_msg_verdict_hdr *vhdr; 1182 enum ip_conntrack_info ctinfo; 1183 struct nfqnl_instance *queue; 1184 struct nf_queue_entry *entry; 1185 struct nf_conn *ct = NULL; 1186 unsigned int verdict; 1187 int err; 1188 1189 queue = verdict_instance_lookup(q, queue_num, 1190 NETLINK_CB(skb).portid); 1191 if (IS_ERR(queue)) 1192 return PTR_ERR(queue); 1193 1194 vhdr = verdicthdr_get(nfqa); 1195 if (!vhdr) 1196 return -EINVAL; 1197 1198 verdict = ntohl(vhdr->verdict); 1199 1200 entry = find_dequeue_entry(queue, ntohl(vhdr->id)); 1201 if (entry == NULL) 1202 return -ENOENT; 1203 1204 /* rcu lock already held from nfnl->call_rcu. */ 1205 nfnl_ct = rcu_dereference(nfnl_ct_hook); 1206 1207 if (nfqa[NFQA_CT]) { 1208 if (nfnl_ct != NULL) 1209 ct = nfqnl_ct_parse(nfnl_ct, info->nlh, nfqa, entry, 1210 &ctinfo); 1211 } 1212 1213 if (entry->state.pf == PF_BRIDGE) { 1214 err = nfqa_parse_bridge(entry, nfqa); 1215 if (err < 0) 1216 return err; 1217 } 1218 1219 if (nfqa[NFQA_PAYLOAD]) { 1220 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); 1221 int diff = payload_len - entry->skb->len; 1222 1223 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), 1224 payload_len, entry, diff) < 0) 1225 verdict = NF_DROP; 1226 1227 if (ct && diff) 1228 nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff); 1229 } 1230 1231 if (nfqa[NFQA_MARK]) 1232 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); 1233 1234 nfqnl_reinject(entry, verdict); 1235 return 0; 1236 } 1237 1238 static int nfqnl_recv_unsupp(struct sk_buff *skb, const struct nfnl_info *info, 1239 const struct nlattr * const cda[]) 1240 { 1241 return -ENOTSUPP; 1242 } 1243 1244 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { 1245 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, 1246 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, 1247 [NFQA_CFG_QUEUE_MAXLEN] = { .type = NLA_U32 }, 1248 [NFQA_CFG_MASK] = { .type = NLA_U32 }, 1249 [NFQA_CFG_FLAGS] = { .type = NLA_U32 }, 1250 }; 1251 1252 static const struct nf_queue_handler nfqh = { 1253 .outfn = nfqnl_enqueue_packet, 1254 .nf_hook_drop = nfqnl_nf_hook_drop, 1255 }; 1256 1257 static int nfqnl_recv_config(struct sk_buff *skb, const struct nfnl_info *info, 1258 const struct nlattr * const nfqa[]) 1259 { 1260 struct nfnl_queue_net *q = nfnl_queue_pernet(info->net); 1261 u_int16_t queue_num = ntohs(info->nfmsg->res_id); 1262 struct nfqnl_msg_config_cmd *cmd = NULL; 1263 struct nfqnl_instance *queue; 1264 __u32 flags = 0, mask = 0; 1265 int ret = 0; 1266 1267 if (nfqa[NFQA_CFG_CMD]) { 1268 cmd = nla_data(nfqa[NFQA_CFG_CMD]); 1269 1270 /* Obsolete commands without queue context */ 1271 switch (cmd->command) { 1272 case NFQNL_CFG_CMD_PF_BIND: return 0; 1273 case NFQNL_CFG_CMD_PF_UNBIND: return 0; 1274 } 1275 } 1276 1277 /* Check if we support these flags in first place, dependencies should 1278 * be there too not to break atomicity. 1279 */ 1280 if (nfqa[NFQA_CFG_FLAGS]) { 1281 if (!nfqa[NFQA_CFG_MASK]) { 1282 /* A mask is needed to specify which flags are being 1283 * changed. 1284 */ 1285 return -EINVAL; 1286 } 1287 1288 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); 1289 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); 1290 1291 if (flags >= NFQA_CFG_F_MAX) 1292 return -EOPNOTSUPP; 1293 1294 #if !IS_ENABLED(CONFIG_NETWORK_SECMARK) 1295 if (flags & mask & NFQA_CFG_F_SECCTX) 1296 return -EOPNOTSUPP; 1297 #endif 1298 if ((flags & mask & NFQA_CFG_F_CONNTRACK) && 1299 !rcu_access_pointer(nfnl_ct_hook)) { 1300 #ifdef CONFIG_MODULES 1301 nfnl_unlock(NFNL_SUBSYS_QUEUE); 1302 request_module("ip_conntrack_netlink"); 1303 nfnl_lock(NFNL_SUBSYS_QUEUE); 1304 if (rcu_access_pointer(nfnl_ct_hook)) 1305 return -EAGAIN; 1306 #endif 1307 return -EOPNOTSUPP; 1308 } 1309 } 1310 1311 rcu_read_lock(); 1312 queue = instance_lookup(q, queue_num); 1313 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { 1314 ret = -EPERM; 1315 goto err_out_unlock; 1316 } 1317 1318 if (cmd != NULL) { 1319 switch (cmd->command) { 1320 case NFQNL_CFG_CMD_BIND: 1321 if (queue) { 1322 ret = -EBUSY; 1323 goto err_out_unlock; 1324 } 1325 queue = instance_create(q, queue_num, 1326 NETLINK_CB(skb).portid); 1327 if (IS_ERR(queue)) { 1328 ret = PTR_ERR(queue); 1329 goto err_out_unlock; 1330 } 1331 break; 1332 case NFQNL_CFG_CMD_UNBIND: 1333 if (!queue) { 1334 ret = -ENODEV; 1335 goto err_out_unlock; 1336 } 1337 instance_destroy(q, queue); 1338 goto err_out_unlock; 1339 case NFQNL_CFG_CMD_PF_BIND: 1340 case NFQNL_CFG_CMD_PF_UNBIND: 1341 break; 1342 default: 1343 ret = -ENOTSUPP; 1344 goto err_out_unlock; 1345 } 1346 } 1347 1348 if (!queue) { 1349 ret = -ENODEV; 1350 goto err_out_unlock; 1351 } 1352 1353 if (nfqa[NFQA_CFG_PARAMS]) { 1354 struct nfqnl_msg_config_params *params = 1355 nla_data(nfqa[NFQA_CFG_PARAMS]); 1356 1357 nfqnl_set_mode(queue, params->copy_mode, 1358 ntohl(params->copy_range)); 1359 } 1360 1361 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { 1362 __be32 *queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); 1363 1364 spin_lock_bh(&queue->lock); 1365 queue->queue_maxlen = ntohl(*queue_maxlen); 1366 spin_unlock_bh(&queue->lock); 1367 } 1368 1369 if (nfqa[NFQA_CFG_FLAGS]) { 1370 spin_lock_bh(&queue->lock); 1371 queue->flags &= ~mask; 1372 queue->flags |= flags & mask; 1373 spin_unlock_bh(&queue->lock); 1374 } 1375 1376 err_out_unlock: 1377 rcu_read_unlock(); 1378 return ret; 1379 } 1380 1381 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { 1382 [NFQNL_MSG_PACKET] = { 1383 .call = nfqnl_recv_unsupp, 1384 .type = NFNL_CB_RCU, 1385 .attr_count = NFQA_MAX, 1386 }, 1387 [NFQNL_MSG_VERDICT] = { 1388 .call = nfqnl_recv_verdict, 1389 .type = NFNL_CB_RCU, 1390 .attr_count = NFQA_MAX, 1391 .policy = nfqa_verdict_policy 1392 }, 1393 [NFQNL_MSG_CONFIG] = { 1394 .call = nfqnl_recv_config, 1395 .type = NFNL_CB_MUTEX, 1396 .attr_count = NFQA_CFG_MAX, 1397 .policy = nfqa_cfg_policy 1398 }, 1399 [NFQNL_MSG_VERDICT_BATCH] = { 1400 .call = nfqnl_recv_verdict_batch, 1401 .type = NFNL_CB_RCU, 1402 .attr_count = NFQA_MAX, 1403 .policy = nfqa_verdict_batch_policy 1404 }, 1405 }; 1406 1407 static const struct nfnetlink_subsystem nfqnl_subsys = { 1408 .name = "nf_queue", 1409 .subsys_id = NFNL_SUBSYS_QUEUE, 1410 .cb_count = NFQNL_MSG_MAX, 1411 .cb = nfqnl_cb, 1412 }; 1413 1414 #ifdef CONFIG_PROC_FS 1415 struct iter_state { 1416 struct seq_net_private p; 1417 unsigned int bucket; 1418 }; 1419 1420 static struct hlist_node *get_first(struct seq_file *seq) 1421 { 1422 struct iter_state *st = seq->private; 1423 struct net *net; 1424 struct nfnl_queue_net *q; 1425 1426 if (!st) 1427 return NULL; 1428 1429 net = seq_file_net(seq); 1430 q = nfnl_queue_pernet(net); 1431 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { 1432 if (!hlist_empty(&q->instance_table[st->bucket])) 1433 return q->instance_table[st->bucket].first; 1434 } 1435 return NULL; 1436 } 1437 1438 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) 1439 { 1440 struct iter_state *st = seq->private; 1441 struct net *net = seq_file_net(seq); 1442 1443 h = h->next; 1444 while (!h) { 1445 struct nfnl_queue_net *q; 1446 1447 if (++st->bucket >= INSTANCE_BUCKETS) 1448 return NULL; 1449 1450 q = nfnl_queue_pernet(net); 1451 h = q->instance_table[st->bucket].first; 1452 } 1453 return h; 1454 } 1455 1456 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) 1457 { 1458 struct hlist_node *head; 1459 head = get_first(seq); 1460 1461 if (head) 1462 while (pos && (head = get_next(seq, head))) 1463 pos--; 1464 return pos ? NULL : head; 1465 } 1466 1467 static void *seq_start(struct seq_file *s, loff_t *pos) 1468 __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) 1469 { 1470 spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); 1471 return get_idx(s, *pos); 1472 } 1473 1474 static void *seq_next(struct seq_file *s, void *v, loff_t *pos) 1475 { 1476 (*pos)++; 1477 return get_next(s, v); 1478 } 1479 1480 static void seq_stop(struct seq_file *s, void *v) 1481 __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) 1482 { 1483 spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); 1484 } 1485 1486 static int seq_show(struct seq_file *s, void *v) 1487 { 1488 const struct nfqnl_instance *inst = v; 1489 1490 seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n", 1491 inst->queue_num, 1492 inst->peer_portid, inst->queue_total, 1493 inst->copy_mode, inst->copy_range, 1494 inst->queue_dropped, inst->queue_user_dropped, 1495 inst->id_sequence, 1); 1496 return 0; 1497 } 1498 1499 static const struct seq_operations nfqnl_seq_ops = { 1500 .start = seq_start, 1501 .next = seq_next, 1502 .stop = seq_stop, 1503 .show = seq_show, 1504 }; 1505 #endif /* PROC_FS */ 1506 1507 static int __net_init nfnl_queue_net_init(struct net *net) 1508 { 1509 unsigned int i; 1510 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1511 1512 for (i = 0; i < INSTANCE_BUCKETS; i++) 1513 INIT_HLIST_HEAD(&q->instance_table[i]); 1514 1515 spin_lock_init(&q->instances_lock); 1516 1517 #ifdef CONFIG_PROC_FS 1518 if (!proc_create_net("nfnetlink_queue", 0440, net->nf.proc_netfilter, 1519 &nfqnl_seq_ops, sizeof(struct iter_state))) 1520 return -ENOMEM; 1521 #endif 1522 return 0; 1523 } 1524 1525 static void __net_exit nfnl_queue_net_exit(struct net *net) 1526 { 1527 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1528 unsigned int i; 1529 1530 #ifdef CONFIG_PROC_FS 1531 remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); 1532 #endif 1533 for (i = 0; i < INSTANCE_BUCKETS; i++) 1534 WARN_ON_ONCE(!hlist_empty(&q->instance_table[i])); 1535 } 1536 1537 static struct pernet_operations nfnl_queue_net_ops = { 1538 .init = nfnl_queue_net_init, 1539 .exit = nfnl_queue_net_exit, 1540 .id = &nfnl_queue_net_id, 1541 .size = sizeof(struct nfnl_queue_net), 1542 }; 1543 1544 static int __init nfnetlink_queue_init(void) 1545 { 1546 int status; 1547 1548 status = register_pernet_subsys(&nfnl_queue_net_ops); 1549 if (status < 0) { 1550 pr_err("failed to register pernet ops\n"); 1551 goto out; 1552 } 1553 1554 netlink_register_notifier(&nfqnl_rtnl_notifier); 1555 status = nfnetlink_subsys_register(&nfqnl_subsys); 1556 if (status < 0) { 1557 pr_err("failed to create netlink socket\n"); 1558 goto cleanup_netlink_notifier; 1559 } 1560 1561 status = register_netdevice_notifier(&nfqnl_dev_notifier); 1562 if (status < 0) { 1563 pr_err("failed to register netdevice notifier\n"); 1564 goto cleanup_netlink_subsys; 1565 } 1566 1567 nf_register_queue_handler(&nfqh); 1568 1569 return status; 1570 1571 cleanup_netlink_subsys: 1572 nfnetlink_subsys_unregister(&nfqnl_subsys); 1573 cleanup_netlink_notifier: 1574 netlink_unregister_notifier(&nfqnl_rtnl_notifier); 1575 unregister_pernet_subsys(&nfnl_queue_net_ops); 1576 out: 1577 return status; 1578 } 1579 1580 static void __exit nfnetlink_queue_fini(void) 1581 { 1582 nf_unregister_queue_handler(); 1583 unregister_netdevice_notifier(&nfqnl_dev_notifier); 1584 nfnetlink_subsys_unregister(&nfqnl_subsys); 1585 netlink_unregister_notifier(&nfqnl_rtnl_notifier); 1586 unregister_pernet_subsys(&nfnl_queue_net_ops); 1587 1588 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1589 } 1590 1591 MODULE_DESCRIPTION("netfilter packet queue handler"); 1592 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); 1593 MODULE_LICENSE("GPL"); 1594 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); 1595 1596 module_init(nfnetlink_queue_init); 1597 module_exit(nfnetlink_queue_fini); 1598