1 /* 2 * This is a module which is used for queueing packets and communicating with 3 * userspace via nfnetlink. 4 * 5 * (C) 2005 by Harald Welte <[email protected]> 6 * (C) 2007 by Patrick McHardy <[email protected]> 7 * 8 * Based on the old ipv4-only ip_queue.c: 9 * (C) 2000-2002 James Morris <[email protected]> 10 * (C) 2003-2005 Netfilter Core Team <[email protected]> 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License version 2 as 14 * published by the Free Software Foundation. 15 * 16 */ 17 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 231 nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) 232 { 233 struct nf_queue_entry *entry, *next; 234 235 spin_lock_bh(&queue->lock); 236 list_for_each_entry_safe(entry, next, &queue->queue_list, list) { 237 if (!cmpfn || cmpfn(entry, data)) { 238 list_del(&entry->list); 239 queue->queue_total--; 240 nf_reinject(entry, NF_DROP); 241 } 242 } 243 spin_unlock_bh(&queue->lock); 244 } 245 246 static int 247 nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet, 248 bool csum_verify) 249 { 250 __u32 flags = 0; 251 252 if (packet->ip_summed == CHECKSUM_PARTIAL) 253 flags = NFQA_SKB_CSUMNOTREADY; 254 else if (csum_verify) 255 flags = NFQA_SKB_CSUM_NOTVERIFIED; 256 257 if (skb_is_gso(packet)) 258 flags |= NFQA_SKB_GSO; 259 260 return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0; 261 } 262 263 static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk) 264 { 265 const struct cred *cred; 266 267 if (!sk_fullsock(sk)) 268 return 0; 269 270 read_lock_bh(&sk->sk_callback_lock); 271 if (sk->sk_socket && sk->sk_socket->file) { 272 cred = sk->sk_socket->file->f_cred; 273 if (nla_put_be32(skb, NFQA_UID, 274 htonl(from_kuid_munged(&init_user_ns, cred->fsuid)))) 275 goto nla_put_failure; 276 if (nla_put_be32(skb, NFQA_GID, 277 htonl(from_kgid_munged(&init_user_ns, cred->fsgid)))) 278 goto nla_put_failure; 279 } 280 read_unlock_bh(&sk->sk_callback_lock); 281 return 0; 282 283 nla_put_failure: 284 read_unlock_bh(&sk->sk_callback_lock); 285 return -1; 286 } 287 288 static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata) 289 { 290 u32 seclen = 0; 291 #if IS_ENABLED(CONFIG_NETWORK_SECMARK) 292 if (!skb || !sk_fullsock(skb->sk)) 293 return 0; 294 295 read_lock_bh(&skb->sk->sk_callback_lock); 296 297 if (skb->secmark) 298 security_secid_to_secctx(skb->secmark, secdata, &seclen); 299 300 read_unlock_bh(&skb->sk->sk_callback_lock); 301 #endif 302 return seclen; 303 } 304 305 static u32 nfqnl_get_bridge_size(struct nf_queue_entry *entry) 306 { 307 struct sk_buff *entskb = entry->skb; 308 u32 nlalen = 0; 309 310 if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb)) 311 return 0; 312 313 if (skb_vlan_tag_present(entskb)) 314 nlalen += nla_total_size(nla_total_size(sizeof(__be16)) + 315 nla_total_size(sizeof(__be16))); 316 317 if (entskb->network_header > entskb->mac_header) 318 nlalen += nla_total_size((entskb->network_header - 319 entskb->mac_header)); 320 321 return nlalen; 322 } 323 324 static int nfqnl_put_bridge(struct nf_queue_entry *entry, struct sk_buff *skb) 325 { 326 struct sk_buff *entskb = entry->skb; 327 328 if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb)) 329 return 0; 330 331 if (skb_vlan_tag_present(entskb)) { 332 struct nlattr *nest; 333 334 nest = nla_nest_start(skb, NFQA_VLAN | NLA_F_NESTED); 335 if (!nest) 336 goto nla_put_failure; 337 338 if (nla_put_be16(skb, NFQA_VLAN_TCI, htons(entskb->vlan_tci)) || 339 nla_put_be16(skb, NFQA_VLAN_PROTO, entskb->vlan_proto)) 340 goto nla_put_failure; 341 342 nla_nest_end(skb, nest); 343 } 344 345 if (entskb->mac_header < entskb->network_header) { 346 int len = (int)(entskb->network_header - entskb->mac_header); 347 348 if (nla_put(skb, NFQA_L2HDR, len, skb_mac_header(entskb))) 349 goto nla_put_failure; 350 } 351 352 return 0; 353 354 nla_put_failure: 355 return -1; 356 } 357 358 static struct sk_buff * 359 nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, 360 struct nf_queue_entry *entry, 361 __be32 **packet_id_ptr) 362 { 363 size_t size; 364 size_t data_len = 0, cap_len = 0; 365 unsigned int hlen = 0; 366 struct sk_buff *skb; 367 struct nlattr *nla; 368 struct nfqnl_msg_packet_hdr *pmsg; 369 struct nlmsghdr *nlh; 370 struct nfgenmsg *nfmsg; 371 struct sk_buff *entskb = entry->skb; 372 struct net_device *indev; 373 struct net_device *outdev; 374 struct nf_conn *ct = NULL; 375 enum ip_conntrack_info uninitialized_var(ctinfo); 376 struct nfnl_ct_hook *nfnl_ct; 377 bool csum_verify; 378 char *secdata = NULL; 379 u32 seclen = 0; 380 381 size = nlmsg_total_size(sizeof(struct nfgenmsg)) 382 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) 383 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 384 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 385 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 386 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 387 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 388 #endif 389 + nla_total_size(sizeof(u_int32_t)) /* mark */ 390 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) 391 + nla_total_size(sizeof(u_int32_t)) /* skbinfo */ 392 + nla_total_size(sizeof(u_int32_t)); /* cap_len */ 393 394 if (entskb->tstamp) 395 size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); 396 397 size += nfqnl_get_bridge_size(entry); 398 399 if (entry->state.hook <= NF_INET_FORWARD || 400 (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL)) 401 csum_verify = !skb_csum_unnecessary(entskb); 402 else 403 csum_verify = false; 404 405 outdev = entry->state.out; 406 407 switch ((enum nfqnl_config_mode)READ_ONCE(queue->copy_mode)) { 408 case NFQNL_COPY_META: 409 case NFQNL_COPY_NONE: 410 break; 411 412 case NFQNL_COPY_PACKET: 413 if (!(queue->flags & NFQA_CFG_F_GSO) && 414 entskb->ip_summed == CHECKSUM_PARTIAL && 415 skb_checksum_help(entskb)) 416 return NULL; 417 418 data_len = READ_ONCE(queue->copy_range); 419 if (data_len > entskb->len) 420 data_len = entskb->len; 421 422 hlen = skb_zerocopy_headlen(entskb); 423 hlen = min_t(unsigned int, hlen, data_len); 424 size += sizeof(struct nlattr) + hlen; 425 cap_len = entskb->len; 426 break; 427 } 428 429 nfnl_ct = rcu_dereference(nfnl_ct_hook); 430 431 if (queue->flags & NFQA_CFG_F_CONNTRACK) { 432 if (nfnl_ct != NULL) { 433 ct = nfnl_ct->get_ct(entskb, &ctinfo); 434 if (ct != NULL) 435 size += nfnl_ct->build_size(ct); 436 } 437 } 438 439 if (queue->flags & NFQA_CFG_F_UID_GID) { 440 size += (nla_total_size(sizeof(u_int32_t)) /* uid */ 441 + nla_total_size(sizeof(u_int32_t))); /* gid */ 442 } 443 444 if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) { 445 seclen = nfqnl_get_sk_secctx(entskb, &secdata); 446 if (seclen) 447 size += nla_total_size(seclen); 448 } 449 450 skb = alloc_skb(size, GFP_ATOMIC); 451 if (!skb) { 452 skb_tx_error(entskb); 453 goto nlmsg_failure; 454 } 455 456 nlh = nlmsg_put(skb, 0, 0, 457 nfnl_msg_type(NFNL_SUBSYS_QUEUE, NFQNL_MSG_PACKET), 458 sizeof(struct nfgenmsg), 0); 459 if (!nlh) { 460 skb_tx_error(entskb); 461 kfree_skb(skb); 462 goto nlmsg_failure; 463 } 464 nfmsg = nlmsg_data(nlh); 465 nfmsg->nfgen_family = entry->state.pf; 466 nfmsg->version = NFNETLINK_V0; 467 nfmsg->res_id = htons(queue->queue_num); 468 469 nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); 470 pmsg = nla_data(nla); 471 pmsg->hw_protocol = entskb->protocol; 472 pmsg->hook = entry->state.hook; 473 *packet_id_ptr = &pmsg->packet_id; 474 475 indev = entry->state.in; 476 if (indev) { 477 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 478 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) 479 goto nla_put_failure; 480 #else 481 if (entry->state.pf == PF_BRIDGE) { 482 /* Case 1: indev is physical input device, we need to 483 * look for bridge group (when called from 484 * netfilter_bridge) */ 485 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, 486 htonl(indev->ifindex)) || 487 /* this is the bridge group "brX" */ 488 /* rcu_read_lock()ed by __nf_queue */ 489 nla_put_be32(skb, NFQA_IFINDEX_INDEV, 490 htonl(br_port_get_rcu(indev)->br->dev->ifindex))) 491 goto nla_put_failure; 492 } else { 493 int physinif; 494 495 /* Case 2: indev is bridge group, we need to look for 496 * physical device (when called from ipv4) */ 497 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, 498 htonl(indev->ifindex))) 499 goto nla_put_failure; 500 501 physinif = nf_bridge_get_physinif(entskb); 502 if (physinif && 503 nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, 504 htonl(physinif))) 505 goto nla_put_failure; 506 } 507 #endif 508 } 509 510 if (outdev) { 511 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 512 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) 513 goto nla_put_failure; 514 #else 515 if (entry->state.pf == PF_BRIDGE) { 516 /* Case 1: outdev is physical output device, we need to 517 * look for bridge group (when called from 518 * netfilter_bridge) */ 519 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, 520 htonl(outdev->ifindex)) || 521 /* this is the bridge group "brX" */ 522 /* rcu_read_lock()ed by __nf_queue */ 523 nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, 524 htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) 525 goto nla_put_failure; 526 } else { 527 int physoutif; 528 529 /* Case 2: outdev is bridge group, we need to look for 530 * physical output device (when called from ipv4) */ 531 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, 532 htonl(outdev->ifindex))) 533 goto nla_put_failure; 534 535 physoutif = nf_bridge_get_physoutif(entskb); 536 if (physoutif && 537 nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, 538 htonl(physoutif))) 539 goto nla_put_failure; 540 } 541 #endif 542 } 543 544 if (entskb->mark && 545 nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) 546 goto nla_put_failure; 547 548 if (indev && entskb->dev && 549 entskb->mac_header != entskb->network_header) { 550 struct nfqnl_msg_packet_hw phw; 551 int len; 552 553 memset(&phw, 0, sizeof(phw)); 554 len = dev_parse_header(entskb, phw.hw_addr); 555 if (len) { 556 phw.hw_addrlen = htons(len); 557 if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) 558 goto nla_put_failure; 559 } 560 } 561 562 if (nfqnl_put_bridge(entry, skb) < 0) 563 goto nla_put_failure; 564 565 if (entskb->tstamp) { 566 struct nfqnl_msg_packet_timestamp ts; 567 struct timespec64 kts = ktime_to_timespec64(entskb->tstamp); 568 569 ts.sec = cpu_to_be64(kts.tv_sec); 570 ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC); 571 572 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) 573 goto nla_put_failure; 574 } 575 576 if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk && 577 nfqnl_put_sk_uidgid(skb, entskb->sk) < 0) 578 goto nla_put_failure; 579 580 if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata)) 581 goto nla_put_failure; 582 583 if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0) 584 goto nla_put_failure; 585 586 if (cap_len > data_len && 587 nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) 588 goto nla_put_failure; 589 590 if (nfqnl_put_packet_info(skb, entskb, csum_verify)) 591 goto nla_put_failure; 592 593 if (data_len) { 594 struct nlattr *nla; 595 596 if (skb_tailroom(skb) < sizeof(*nla) + hlen) 597 goto nla_put_failure; 598 599 nla = skb_put(skb, sizeof(*nla)); 600 nla->nla_type = NFQA_PAYLOAD; 601 nla->nla_len = nla_attr_size(data_len); 602 603 if (skb_zerocopy(skb, entskb, data_len, hlen)) 604 goto nla_put_failure; 605 } 606 607 nlh->nlmsg_len = skb->len; 608 if (seclen) 609 security_release_secctx(secdata, seclen); 610 return skb; 611 612 nla_put_failure: 613 skb_tx_error(entskb); 614 kfree_skb(skb); 615 net_err_ratelimited("nf_queue: error creating packet message\n"); 616 nlmsg_failure: 617 if (seclen) 618 security_release_secctx(secdata, seclen); 619 return NULL; 620 } 621 622 static bool nf_ct_drop_unconfirmed(const struct nf_queue_entry *entry) 623 { 624 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 625 static const unsigned long flags = IPS_CONFIRMED | IPS_DYING; 626 const struct nf_conn *ct = (void *)skb_nfct(entry->skb); 627 628 if (ct && ((ct->status & flags) == IPS_DYING)) 629 return true; 630 #endif 631 return false; 632 } 633 634 static int 635 __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, 636 struct nf_queue_entry *entry) 637 { 638 struct sk_buff *nskb; 639 int err = -ENOBUFS; 640 __be32 *packet_id_ptr; 641 int failopen = 0; 642 643 nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr); 644 if (nskb == NULL) { 645 err = -ENOMEM; 646 goto err_out; 647 } 648 spin_lock_bh(&queue->lock); 649 650 if (nf_ct_drop_unconfirmed(entry)) 651 goto err_out_free_nskb; 652 653 if (queue->queue_total >= queue->queue_maxlen) { 654 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { 655 failopen = 1; 656 err = 0; 657 } else { 658 queue->queue_dropped++; 659 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", 660 queue->queue_total); 661 } 662 goto err_out_free_nskb; 663 } 664 entry->id = ++queue->id_sequence; 665 *packet_id_ptr = htonl(entry->id); 666 667 /* nfnetlink_unicast will either free the nskb or add it to a socket */ 668 err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT); 669 if (err < 0) { 670 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { 671 failopen = 1; 672 err = 0; 673 } else { 674 queue->queue_user_dropped++; 675 } 676 goto err_out_unlock; 677 } 678 679 __enqueue_entry(queue, entry); 680 681 spin_unlock_bh(&queue->lock); 682 return 0; 683 684 err_out_free_nskb: 685 kfree_skb(nskb); 686 err_out_unlock: 687 spin_unlock_bh(&queue->lock); 688 if (failopen) 689 nf_reinject(entry, NF_ACCEPT); 690 err_out: 691 return err; 692 } 693 694 static struct nf_queue_entry * 695 nf_queue_entry_dup(struct nf_queue_entry *e) 696 { 697 struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); 698 if (entry) 699 nf_queue_entry_get_refs(entry); 700 return entry; 701 } 702 703 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 704 /* When called from bridge netfilter, skb->data must point to MAC header 705 * before calling skb_gso_segment(). Else, original MAC header is lost 706 * and segmented skbs will be sent to wrong destination. 707 */ 708 static void nf_bridge_adjust_skb_data(struct sk_buff *skb) 709 { 710 if (skb->nf_bridge) 711 __skb_push(skb, skb->network_header - skb->mac_header); 712 } 713 714 static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) 715 { 716 if (skb->nf_bridge) 717 __skb_pull(skb, skb->network_header - skb->mac_header); 718 } 719 #else 720 #define nf_bridge_adjust_skb_data(s) do {} while (0) 721 #define nf_bridge_adjust_segmented_data(s) do {} while (0) 722 #endif 723 724 static void free_entry(struct nf_queue_entry *entry) 725 { 726 nf_queue_entry_release_refs(entry); 727 kfree(entry); 728 } 729 730 static int 731 __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue, 732 struct sk_buff *skb, struct nf_queue_entry *entry) 733 { 734 int ret = -ENOMEM; 735 struct nf_queue_entry *entry_seg; 736 737 nf_bridge_adjust_segmented_data(skb); 738 739 if (skb->next == NULL) { /* last packet, no need to copy entry */ 740 struct sk_buff *gso_skb = entry->skb; 741 entry->skb = skb; 742 ret = __nfqnl_enqueue_packet(net, queue, entry); 743 if (ret) 744 entry->skb = gso_skb; 745 return ret; 746 } 747 748 skb->next = NULL; 749 750 entry_seg = nf_queue_entry_dup(entry); 751 if (entry_seg) { 752 entry_seg->skb = skb; 753 ret = __nfqnl_enqueue_packet(net, queue, entry_seg); 754 if (ret) 755 free_entry(entry_seg); 756 } 757 return ret; 758 } 759 760 static int 761 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) 762 { 763 unsigned int queued; 764 struct nfqnl_instance *queue; 765 struct sk_buff *skb, *segs; 766 int err = -ENOBUFS; 767 struct net *net = entry->state.net; 768 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 769 770 /* rcu_read_lock()ed by nf_hook_thresh */ 771 queue = instance_lookup(q, queuenum); 772 if (!queue) 773 return -ESRCH; 774 775 if (queue->copy_mode == NFQNL_COPY_NONE) 776 return -EINVAL; 777 778 skb = entry->skb; 779 780 switch (entry->state.pf) { 781 case NFPROTO_IPV4: 782 skb->protocol = htons(ETH_P_IP); 783 break; 784 case NFPROTO_IPV6: 785 skb->protocol = htons(ETH_P_IPV6); 786 break; 787 } 788 789 if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb)) 790 return __nfqnl_enqueue_packet(net, queue, entry); 791 792 nf_bridge_adjust_skb_data(skb); 793 segs = skb_gso_segment(skb, 0); 794 /* Does not use PTR_ERR to limit the number of error codes that can be 795 * returned by nf_queue. For instance, callers rely on -ESRCH to 796 * mean 'ignore this hook'. 797 */ 798 if (IS_ERR_OR_NULL(segs)) 799 goto out_err; 800 queued = 0; 801 err = 0; 802 do { 803 struct sk_buff *nskb = segs->next; 804 if (err == 0) 805 err = __nfqnl_enqueue_packet_gso(net, queue, 806 segs, entry); 807 if (err == 0) 808 queued++; 809 else 810 kfree_skb(segs); 811 segs = nskb; 812 } while (segs); 813 814 if (queued) { 815 if (err) /* some segments are already queued */ 816 free_entry(entry); 817 kfree_skb(skb); 818 return 0; 819 } 820 out_err: 821 nf_bridge_adjust_segmented_data(skb); 822 return err; 823 } 824 825 static int 826 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) 827 { 828 struct sk_buff *nskb; 829 830 if (diff < 0) { 831 if (pskb_trim(e->skb, data_len)) 832 return -ENOMEM; 833 } else if (diff > 0) { 834 if (data_len > 0xFFFF) 835 return -EINVAL; 836 if (diff > skb_tailroom(e->skb)) { 837 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), 838 diff, GFP_ATOMIC); 839 if (!nskb) 840 return -ENOMEM; 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 void nfqnl_nf_hook_drop(struct net *net) 945 { 946 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 947 int i; 948 949 for (i = 0; i < INSTANCE_BUCKETS; i++) { 950 struct nfqnl_instance *inst; 951 struct hlist_head *head = &q->instance_table[i]; 952 953 hlist_for_each_entry_rcu(inst, head, hlist) 954 nfqnl_flush(inst, NULL, 0); 955 } 956 } 957 958 static int 959 nfqnl_rcv_nl_event(struct notifier_block *this, 960 unsigned long event, void *ptr) 961 { 962 struct netlink_notify *n = ptr; 963 struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); 964 965 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { 966 int i; 967 968 /* destroy all instances for this portid */ 969 spin_lock(&q->instances_lock); 970 for (i = 0; i < INSTANCE_BUCKETS; i++) { 971 struct hlist_node *t2; 972 struct nfqnl_instance *inst; 973 struct hlist_head *head = &q->instance_table[i]; 974 975 hlist_for_each_entry_safe(inst, t2, head, hlist) { 976 if (n->portid == inst->peer_portid) 977 __instance_destroy(inst); 978 } 979 } 980 spin_unlock(&q->instances_lock); 981 } 982 return NOTIFY_DONE; 983 } 984 985 static struct notifier_block nfqnl_rtnl_notifier = { 986 .notifier_call = nfqnl_rcv_nl_event, 987 }; 988 989 static const struct nla_policy nfqa_vlan_policy[NFQA_VLAN_MAX + 1] = { 990 [NFQA_VLAN_TCI] = { .type = NLA_U16}, 991 [NFQA_VLAN_PROTO] = { .type = NLA_U16}, 992 }; 993 994 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { 995 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, 996 [NFQA_MARK] = { .type = NLA_U32 }, 997 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, 998 [NFQA_CT] = { .type = NLA_UNSPEC }, 999 [NFQA_EXP] = { .type = NLA_UNSPEC }, 1000 [NFQA_VLAN] = { .type = NLA_NESTED }, 1001 }; 1002 1003 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { 1004 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, 1005 [NFQA_MARK] = { .type = NLA_U32 }, 1006 }; 1007 1008 static struct nfqnl_instance * 1009 verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid) 1010 { 1011 struct nfqnl_instance *queue; 1012 1013 queue = instance_lookup(q, queue_num); 1014 if (!queue) 1015 return ERR_PTR(-ENODEV); 1016 1017 if (queue->peer_portid != nlportid) 1018 return ERR_PTR(-EPERM); 1019 1020 return queue; 1021 } 1022 1023 static struct nfqnl_msg_verdict_hdr* 1024 verdicthdr_get(const struct nlattr * const nfqa[]) 1025 { 1026 struct nfqnl_msg_verdict_hdr *vhdr; 1027 unsigned int verdict; 1028 1029 if (!nfqa[NFQA_VERDICT_HDR]) 1030 return NULL; 1031 1032 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); 1033 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; 1034 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) 1035 return NULL; 1036 return vhdr; 1037 } 1038 1039 static int nfq_id_after(unsigned int id, unsigned int max) 1040 { 1041 return (int)(id - max) > 0; 1042 } 1043 1044 static int nfqnl_recv_verdict_batch(struct net *net, struct sock *ctnl, 1045 struct sk_buff *skb, 1046 const struct nlmsghdr *nlh, 1047 const struct nlattr * const nfqa[], 1048 struct netlink_ext_ack *extack) 1049 { 1050 struct nfgenmsg *nfmsg = nlmsg_data(nlh); 1051 struct nf_queue_entry *entry, *tmp; 1052 unsigned int verdict, maxid; 1053 struct nfqnl_msg_verdict_hdr *vhdr; 1054 struct nfqnl_instance *queue; 1055 LIST_HEAD(batch_list); 1056 u16 queue_num = ntohs(nfmsg->res_id); 1057 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1058 1059 queue = verdict_instance_lookup(q, queue_num, 1060 NETLINK_CB(skb).portid); 1061 if (IS_ERR(queue)) 1062 return PTR_ERR(queue); 1063 1064 vhdr = verdicthdr_get(nfqa); 1065 if (!vhdr) 1066 return -EINVAL; 1067 1068 verdict = ntohl(vhdr->verdict); 1069 maxid = ntohl(vhdr->id); 1070 1071 spin_lock_bh(&queue->lock); 1072 1073 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { 1074 if (nfq_id_after(entry->id, maxid)) 1075 break; 1076 __dequeue_entry(queue, entry); 1077 list_add_tail(&entry->list, &batch_list); 1078 } 1079 1080 spin_unlock_bh(&queue->lock); 1081 1082 if (list_empty(&batch_list)) 1083 return -ENOENT; 1084 1085 list_for_each_entry_safe(entry, tmp, &batch_list, list) { 1086 if (nfqa[NFQA_MARK]) 1087 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); 1088 nf_reinject(entry, verdict); 1089 } 1090 return 0; 1091 } 1092 1093 static struct nf_conn *nfqnl_ct_parse(struct nfnl_ct_hook *nfnl_ct, 1094 const struct nlmsghdr *nlh, 1095 const struct nlattr * const nfqa[], 1096 struct nf_queue_entry *entry, 1097 enum ip_conntrack_info *ctinfo) 1098 { 1099 struct nf_conn *ct; 1100 1101 ct = nfnl_ct->get_ct(entry->skb, ctinfo); 1102 if (ct == NULL) 1103 return NULL; 1104 1105 if (nfnl_ct->parse(nfqa[NFQA_CT], ct) < 0) 1106 return NULL; 1107 1108 if (nfqa[NFQA_EXP]) 1109 nfnl_ct->attach_expect(nfqa[NFQA_EXP], ct, 1110 NETLINK_CB(entry->skb).portid, 1111 nlmsg_report(nlh)); 1112 return ct; 1113 } 1114 1115 static int nfqa_parse_bridge(struct nf_queue_entry *entry, 1116 const struct nlattr * const nfqa[]) 1117 { 1118 if (nfqa[NFQA_VLAN]) { 1119 struct nlattr *tb[NFQA_VLAN_MAX + 1]; 1120 int err; 1121 1122 err = nla_parse_nested(tb, NFQA_VLAN_MAX, nfqa[NFQA_VLAN], 1123 nfqa_vlan_policy, NULL); 1124 if (err < 0) 1125 return err; 1126 1127 if (!tb[NFQA_VLAN_TCI] || !tb[NFQA_VLAN_PROTO]) 1128 return -EINVAL; 1129 1130 entry->skb->vlan_tci = ntohs(nla_get_be16(tb[NFQA_VLAN_TCI])); 1131 entry->skb->vlan_proto = nla_get_be16(tb[NFQA_VLAN_PROTO]); 1132 } 1133 1134 if (nfqa[NFQA_L2HDR]) { 1135 int mac_header_len = entry->skb->network_header - 1136 entry->skb->mac_header; 1137 1138 if (mac_header_len != nla_len(nfqa[NFQA_L2HDR])) 1139 return -EINVAL; 1140 else if (mac_header_len > 0) 1141 memcpy(skb_mac_header(entry->skb), 1142 nla_data(nfqa[NFQA_L2HDR]), 1143 mac_header_len); 1144 } 1145 1146 return 0; 1147 } 1148 1149 static int nfqnl_recv_verdict(struct net *net, struct sock *ctnl, 1150 struct sk_buff *skb, 1151 const struct nlmsghdr *nlh, 1152 const struct nlattr * const nfqa[], 1153 struct netlink_ext_ack *extack) 1154 { 1155 struct nfgenmsg *nfmsg = nlmsg_data(nlh); 1156 u_int16_t queue_num = ntohs(nfmsg->res_id); 1157 struct nfqnl_msg_verdict_hdr *vhdr; 1158 struct nfqnl_instance *queue; 1159 unsigned int verdict; 1160 struct nf_queue_entry *entry; 1161 enum ip_conntrack_info uninitialized_var(ctinfo); 1162 struct nfnl_ct_hook *nfnl_ct; 1163 struct nf_conn *ct = NULL; 1164 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1165 int err; 1166 1167 queue = verdict_instance_lookup(q, queue_num, 1168 NETLINK_CB(skb).portid); 1169 if (IS_ERR(queue)) 1170 return PTR_ERR(queue); 1171 1172 vhdr = verdicthdr_get(nfqa); 1173 if (!vhdr) 1174 return -EINVAL; 1175 1176 verdict = ntohl(vhdr->verdict); 1177 1178 entry = find_dequeue_entry(queue, ntohl(vhdr->id)); 1179 if (entry == NULL) 1180 return -ENOENT; 1181 1182 /* rcu lock already held from nfnl->call_rcu. */ 1183 nfnl_ct = rcu_dereference(nfnl_ct_hook); 1184 1185 if (nfqa[NFQA_CT]) { 1186 if (nfnl_ct != NULL) 1187 ct = nfqnl_ct_parse(nfnl_ct, nlh, nfqa, entry, &ctinfo); 1188 } 1189 1190 if (entry->state.pf == PF_BRIDGE) { 1191 err = nfqa_parse_bridge(entry, nfqa); 1192 if (err < 0) 1193 return err; 1194 } 1195 1196 if (nfqa[NFQA_PAYLOAD]) { 1197 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); 1198 int diff = payload_len - entry->skb->len; 1199 1200 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), 1201 payload_len, entry, diff) < 0) 1202 verdict = NF_DROP; 1203 1204 if (ct && diff) 1205 nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff); 1206 } 1207 1208 if (nfqa[NFQA_MARK]) 1209 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); 1210 1211 nf_reinject(entry, verdict); 1212 return 0; 1213 } 1214 1215 static int nfqnl_recv_unsupp(struct net *net, struct sock *ctnl, 1216 struct sk_buff *skb, const struct nlmsghdr *nlh, 1217 const struct nlattr * const nfqa[], 1218 struct netlink_ext_ack *extack) 1219 { 1220 return -ENOTSUPP; 1221 } 1222 1223 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { 1224 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, 1225 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, 1226 }; 1227 1228 static const struct nf_queue_handler nfqh = { 1229 .outfn = nfqnl_enqueue_packet, 1230 .nf_hook_drop = nfqnl_nf_hook_drop, 1231 }; 1232 1233 static int nfqnl_recv_config(struct net *net, struct sock *ctnl, 1234 struct sk_buff *skb, const struct nlmsghdr *nlh, 1235 const struct nlattr * const nfqa[], 1236 struct netlink_ext_ack *extack) 1237 { 1238 struct nfgenmsg *nfmsg = nlmsg_data(nlh); 1239 u_int16_t queue_num = ntohs(nfmsg->res_id); 1240 struct nfqnl_instance *queue; 1241 struct nfqnl_msg_config_cmd *cmd = NULL; 1242 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1243 __u32 flags = 0, mask = 0; 1244 int ret = 0; 1245 1246 if (nfqa[NFQA_CFG_CMD]) { 1247 cmd = nla_data(nfqa[NFQA_CFG_CMD]); 1248 1249 /* Obsolete commands without queue context */ 1250 switch (cmd->command) { 1251 case NFQNL_CFG_CMD_PF_BIND: return 0; 1252 case NFQNL_CFG_CMD_PF_UNBIND: return 0; 1253 } 1254 } 1255 1256 /* Check if we support these flags in first place, dependencies should 1257 * be there too not to break atomicity. 1258 */ 1259 if (nfqa[NFQA_CFG_FLAGS]) { 1260 if (!nfqa[NFQA_CFG_MASK]) { 1261 /* A mask is needed to specify which flags are being 1262 * changed. 1263 */ 1264 return -EINVAL; 1265 } 1266 1267 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); 1268 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); 1269 1270 if (flags >= NFQA_CFG_F_MAX) 1271 return -EOPNOTSUPP; 1272 1273 #if !IS_ENABLED(CONFIG_NETWORK_SECMARK) 1274 if (flags & mask & NFQA_CFG_F_SECCTX) 1275 return -EOPNOTSUPP; 1276 #endif 1277 if ((flags & mask & NFQA_CFG_F_CONNTRACK) && 1278 !rcu_access_pointer(nfnl_ct_hook)) { 1279 #ifdef CONFIG_MODULES 1280 nfnl_unlock(NFNL_SUBSYS_QUEUE); 1281 request_module("ip_conntrack_netlink"); 1282 nfnl_lock(NFNL_SUBSYS_QUEUE); 1283 if (rcu_access_pointer(nfnl_ct_hook)) 1284 return -EAGAIN; 1285 #endif 1286 return -EOPNOTSUPP; 1287 } 1288 } 1289 1290 rcu_read_lock(); 1291 queue = instance_lookup(q, queue_num); 1292 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { 1293 ret = -EPERM; 1294 goto err_out_unlock; 1295 } 1296 1297 if (cmd != NULL) { 1298 switch (cmd->command) { 1299 case NFQNL_CFG_CMD_BIND: 1300 if (queue) { 1301 ret = -EBUSY; 1302 goto err_out_unlock; 1303 } 1304 queue = instance_create(q, queue_num, 1305 NETLINK_CB(skb).portid); 1306 if (IS_ERR(queue)) { 1307 ret = PTR_ERR(queue); 1308 goto err_out_unlock; 1309 } 1310 break; 1311 case NFQNL_CFG_CMD_UNBIND: 1312 if (!queue) { 1313 ret = -ENODEV; 1314 goto err_out_unlock; 1315 } 1316 instance_destroy(q, queue); 1317 goto err_out_unlock; 1318 case NFQNL_CFG_CMD_PF_BIND: 1319 case NFQNL_CFG_CMD_PF_UNBIND: 1320 break; 1321 default: 1322 ret = -ENOTSUPP; 1323 goto err_out_unlock; 1324 } 1325 } 1326 1327 if (!queue) { 1328 ret = -ENODEV; 1329 goto err_out_unlock; 1330 } 1331 1332 if (nfqa[NFQA_CFG_PARAMS]) { 1333 struct nfqnl_msg_config_params *params = 1334 nla_data(nfqa[NFQA_CFG_PARAMS]); 1335 1336 nfqnl_set_mode(queue, params->copy_mode, 1337 ntohl(params->copy_range)); 1338 } 1339 1340 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { 1341 __be32 *queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); 1342 1343 spin_lock_bh(&queue->lock); 1344 queue->queue_maxlen = ntohl(*queue_maxlen); 1345 spin_unlock_bh(&queue->lock); 1346 } 1347 1348 if (nfqa[NFQA_CFG_FLAGS]) { 1349 spin_lock_bh(&queue->lock); 1350 queue->flags &= ~mask; 1351 queue->flags |= flags & mask; 1352 spin_unlock_bh(&queue->lock); 1353 } 1354 1355 err_out_unlock: 1356 rcu_read_unlock(); 1357 return ret; 1358 } 1359 1360 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { 1361 [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, 1362 .attr_count = NFQA_MAX, }, 1363 [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, 1364 .attr_count = NFQA_MAX, 1365 .policy = nfqa_verdict_policy }, 1366 [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, 1367 .attr_count = NFQA_CFG_MAX, 1368 .policy = nfqa_cfg_policy }, 1369 [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, 1370 .attr_count = NFQA_MAX, 1371 .policy = nfqa_verdict_batch_policy }, 1372 }; 1373 1374 static const struct nfnetlink_subsystem nfqnl_subsys = { 1375 .name = "nf_queue", 1376 .subsys_id = NFNL_SUBSYS_QUEUE, 1377 .cb_count = NFQNL_MSG_MAX, 1378 .cb = nfqnl_cb, 1379 }; 1380 1381 #ifdef CONFIG_PROC_FS 1382 struct iter_state { 1383 struct seq_net_private p; 1384 unsigned int bucket; 1385 }; 1386 1387 static struct hlist_node *get_first(struct seq_file *seq) 1388 { 1389 struct iter_state *st = seq->private; 1390 struct net *net; 1391 struct nfnl_queue_net *q; 1392 1393 if (!st) 1394 return NULL; 1395 1396 net = seq_file_net(seq); 1397 q = nfnl_queue_pernet(net); 1398 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { 1399 if (!hlist_empty(&q->instance_table[st->bucket])) 1400 return q->instance_table[st->bucket].first; 1401 } 1402 return NULL; 1403 } 1404 1405 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) 1406 { 1407 struct iter_state *st = seq->private; 1408 struct net *net = seq_file_net(seq); 1409 1410 h = h->next; 1411 while (!h) { 1412 struct nfnl_queue_net *q; 1413 1414 if (++st->bucket >= INSTANCE_BUCKETS) 1415 return NULL; 1416 1417 q = nfnl_queue_pernet(net); 1418 h = q->instance_table[st->bucket].first; 1419 } 1420 return h; 1421 } 1422 1423 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) 1424 { 1425 struct hlist_node *head; 1426 head = get_first(seq); 1427 1428 if (head) 1429 while (pos && (head = get_next(seq, head))) 1430 pos--; 1431 return pos ? NULL : head; 1432 } 1433 1434 static void *seq_start(struct seq_file *s, loff_t *pos) 1435 __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) 1436 { 1437 spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); 1438 return get_idx(s, *pos); 1439 } 1440 1441 static void *seq_next(struct seq_file *s, void *v, loff_t *pos) 1442 { 1443 (*pos)++; 1444 return get_next(s, v); 1445 } 1446 1447 static void seq_stop(struct seq_file *s, void *v) 1448 __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) 1449 { 1450 spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); 1451 } 1452 1453 static int seq_show(struct seq_file *s, void *v) 1454 { 1455 const struct nfqnl_instance *inst = v; 1456 1457 seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n", 1458 inst->queue_num, 1459 inst->peer_portid, inst->queue_total, 1460 inst->copy_mode, inst->copy_range, 1461 inst->queue_dropped, inst->queue_user_dropped, 1462 inst->id_sequence, 1); 1463 return 0; 1464 } 1465 1466 static const struct seq_operations nfqnl_seq_ops = { 1467 .start = seq_start, 1468 .next = seq_next, 1469 .stop = seq_stop, 1470 .show = seq_show, 1471 }; 1472 1473 static int nfqnl_open(struct inode *inode, struct file *file) 1474 { 1475 return seq_open_net(inode, file, &nfqnl_seq_ops, 1476 sizeof(struct iter_state)); 1477 } 1478 1479 static const struct file_operations nfqnl_file_ops = { 1480 .open = nfqnl_open, 1481 .read = seq_read, 1482 .llseek = seq_lseek, 1483 .release = seq_release_net, 1484 }; 1485 1486 #endif /* PROC_FS */ 1487 1488 static int __net_init nfnl_queue_net_init(struct net *net) 1489 { 1490 unsigned int i; 1491 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1492 1493 for (i = 0; i < INSTANCE_BUCKETS; i++) 1494 INIT_HLIST_HEAD(&q->instance_table[i]); 1495 1496 spin_lock_init(&q->instances_lock); 1497 1498 #ifdef CONFIG_PROC_FS 1499 if (!proc_create("nfnetlink_queue", 0440, 1500 net->nf.proc_netfilter, &nfqnl_file_ops)) 1501 return -ENOMEM; 1502 #endif 1503 nf_register_queue_handler(net, &nfqh); 1504 return 0; 1505 } 1506 1507 static void __net_exit nfnl_queue_net_exit(struct net *net) 1508 { 1509 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1510 unsigned int i; 1511 1512 nf_unregister_queue_handler(net); 1513 #ifdef CONFIG_PROC_FS 1514 remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); 1515 #endif 1516 for (i = 0; i < INSTANCE_BUCKETS; i++) 1517 WARN_ON_ONCE(!hlist_empty(&q->instance_table[i])); 1518 } 1519 1520 static void nfnl_queue_net_exit_batch(struct list_head *net_exit_list) 1521 { 1522 synchronize_rcu(); 1523 } 1524 1525 static struct pernet_operations nfnl_queue_net_ops = { 1526 .init = nfnl_queue_net_init, 1527 .exit = nfnl_queue_net_exit, 1528 .exit_batch = nfnl_queue_net_exit_batch, 1529 .id = &nfnl_queue_net_id, 1530 .size = sizeof(struct nfnl_queue_net), 1531 }; 1532 1533 static int __init nfnetlink_queue_init(void) 1534 { 1535 int status; 1536 1537 status = register_pernet_subsys(&nfnl_queue_net_ops); 1538 if (status < 0) { 1539 pr_err("failed to register pernet ops\n"); 1540 goto out; 1541 } 1542 1543 netlink_register_notifier(&nfqnl_rtnl_notifier); 1544 status = nfnetlink_subsys_register(&nfqnl_subsys); 1545 if (status < 0) { 1546 pr_err("failed to create netlink socket\n"); 1547 goto cleanup_netlink_notifier; 1548 } 1549 1550 status = register_netdevice_notifier(&nfqnl_dev_notifier); 1551 if (status < 0) { 1552 pr_err("failed to register netdevice notifier\n"); 1553 goto cleanup_netlink_subsys; 1554 } 1555 1556 return status; 1557 1558 cleanup_netlink_subsys: 1559 nfnetlink_subsys_unregister(&nfqnl_subsys); 1560 cleanup_netlink_notifier: 1561 netlink_unregister_notifier(&nfqnl_rtnl_notifier); 1562 unregister_pernet_subsys(&nfnl_queue_net_ops); 1563 out: 1564 return status; 1565 } 1566 1567 static void __exit nfnetlink_queue_fini(void) 1568 { 1569 unregister_netdevice_notifier(&nfqnl_dev_notifier); 1570 nfnetlink_subsys_unregister(&nfqnl_subsys); 1571 netlink_unregister_notifier(&nfqnl_rtnl_notifier); 1572 unregister_pernet_subsys(&nfnl_queue_net_ops); 1573 1574 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1575 } 1576 1577 MODULE_DESCRIPTION("netfilter packet queue handler"); 1578 MODULE_AUTHOR("Harald Welte <[email protected]>"); 1579 MODULE_LICENSE("GPL"); 1580 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); 1581 1582 module_init(nfnetlink_queue_init); 1583 module_exit(nfnetlink_queue_fini); 1584