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 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 nfgenmsg *nfmsg; 387 struct sk_buff *entskb = entry->skb; 388 struct net_device *indev; 389 struct net_device *outdev; 390 struct nf_conn *ct = NULL; 391 enum ip_conntrack_info ctinfo; 392 struct nfnl_ct_hook *nfnl_ct; 393 bool csum_verify; 394 char *secdata = NULL; 395 u32 seclen = 0; 396 397 size = nlmsg_total_size(sizeof(struct nfgenmsg)) 398 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) 399 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 400 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 401 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 402 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 403 + nla_total_size(sizeof(u_int32_t)) /* ifindex */ 404 #endif 405 + nla_total_size(sizeof(u_int32_t)) /* mark */ 406 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) 407 + nla_total_size(sizeof(u_int32_t)) /* skbinfo */ 408 + nla_total_size(sizeof(u_int32_t)); /* cap_len */ 409 410 if (entskb->tstamp) 411 size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); 412 413 size += nfqnl_get_bridge_size(entry); 414 415 if (entry->state.hook <= NF_INET_FORWARD || 416 (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL)) 417 csum_verify = !skb_csum_unnecessary(entskb); 418 else 419 csum_verify = false; 420 421 outdev = entry->state.out; 422 423 switch ((enum nfqnl_config_mode)READ_ONCE(queue->copy_mode)) { 424 case NFQNL_COPY_META: 425 case NFQNL_COPY_NONE: 426 break; 427 428 case NFQNL_COPY_PACKET: 429 if (!(queue->flags & NFQA_CFG_F_GSO) && 430 entskb->ip_summed == CHECKSUM_PARTIAL && 431 skb_checksum_help(entskb)) 432 return NULL; 433 434 data_len = READ_ONCE(queue->copy_range); 435 if (data_len > entskb->len) 436 data_len = entskb->len; 437 438 hlen = skb_zerocopy_headlen(entskb); 439 hlen = min_t(unsigned int, hlen, data_len); 440 size += sizeof(struct nlattr) + hlen; 441 cap_len = entskb->len; 442 break; 443 } 444 445 nfnl_ct = rcu_dereference(nfnl_ct_hook); 446 447 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 448 if (queue->flags & NFQA_CFG_F_CONNTRACK) { 449 if (nfnl_ct != NULL) { 450 ct = nf_ct_get(entskb, &ctinfo); 451 if (ct != NULL) 452 size += nfnl_ct->build_size(ct); 453 } 454 } 455 #endif 456 457 if (queue->flags & NFQA_CFG_F_UID_GID) { 458 size += (nla_total_size(sizeof(u_int32_t)) /* uid */ 459 + nla_total_size(sizeof(u_int32_t))); /* gid */ 460 } 461 462 if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) { 463 seclen = nfqnl_get_sk_secctx(entskb, &secdata); 464 if (seclen) 465 size += nla_total_size(seclen); 466 } 467 468 skb = alloc_skb(size, GFP_ATOMIC); 469 if (!skb) { 470 skb_tx_error(entskb); 471 goto nlmsg_failure; 472 } 473 474 nlh = nlmsg_put(skb, 0, 0, 475 nfnl_msg_type(NFNL_SUBSYS_QUEUE, NFQNL_MSG_PACKET), 476 sizeof(struct nfgenmsg), 0); 477 if (!nlh) { 478 skb_tx_error(entskb); 479 kfree_skb(skb); 480 goto nlmsg_failure; 481 } 482 nfmsg = nlmsg_data(nlh); 483 nfmsg->nfgen_family = entry->state.pf; 484 nfmsg->version = NFNETLINK_V0; 485 nfmsg->res_id = htons(queue->queue_num); 486 487 nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); 488 pmsg = nla_data(nla); 489 pmsg->hw_protocol = entskb->protocol; 490 pmsg->hook = entry->state.hook; 491 *packet_id_ptr = &pmsg->packet_id; 492 493 indev = entry->state.in; 494 if (indev) { 495 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 496 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) 497 goto nla_put_failure; 498 #else 499 if (entry->state.pf == PF_BRIDGE) { 500 /* Case 1: indev is physical input device, we need to 501 * look for bridge group (when called from 502 * netfilter_bridge) */ 503 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, 504 htonl(indev->ifindex)) || 505 /* this is the bridge group "brX" */ 506 /* rcu_read_lock()ed by __nf_queue */ 507 nla_put_be32(skb, NFQA_IFINDEX_INDEV, 508 htonl(br_port_get_rcu(indev)->br->dev->ifindex))) 509 goto nla_put_failure; 510 } else { 511 int physinif; 512 513 /* Case 2: indev is bridge group, we need to look for 514 * physical device (when called from ipv4) */ 515 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, 516 htonl(indev->ifindex))) 517 goto nla_put_failure; 518 519 physinif = nf_bridge_get_physinif(entskb); 520 if (physinif && 521 nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, 522 htonl(physinif))) 523 goto nla_put_failure; 524 } 525 #endif 526 } 527 528 if (outdev) { 529 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 530 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) 531 goto nla_put_failure; 532 #else 533 if (entry->state.pf == PF_BRIDGE) { 534 /* Case 1: outdev is physical output device, we need to 535 * look for bridge group (when called from 536 * netfilter_bridge) */ 537 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, 538 htonl(outdev->ifindex)) || 539 /* this is the bridge group "brX" */ 540 /* rcu_read_lock()ed by __nf_queue */ 541 nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, 542 htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) 543 goto nla_put_failure; 544 } else { 545 int physoutif; 546 547 /* Case 2: outdev is bridge group, we need to look for 548 * physical output device (when called from ipv4) */ 549 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, 550 htonl(outdev->ifindex))) 551 goto nla_put_failure; 552 553 physoutif = nf_bridge_get_physoutif(entskb); 554 if (physoutif && 555 nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, 556 htonl(physoutif))) 557 goto nla_put_failure; 558 } 559 #endif 560 } 561 562 if (entskb->mark && 563 nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) 564 goto nla_put_failure; 565 566 if (indev && entskb->dev && 567 entskb->mac_header != entskb->network_header) { 568 struct nfqnl_msg_packet_hw phw; 569 int len; 570 571 memset(&phw, 0, sizeof(phw)); 572 len = dev_parse_header(entskb, phw.hw_addr); 573 if (len) { 574 phw.hw_addrlen = htons(len); 575 if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) 576 goto nla_put_failure; 577 } 578 } 579 580 if (nfqnl_put_bridge(entry, skb) < 0) 581 goto nla_put_failure; 582 583 if (entry->state.hook <= NF_INET_FORWARD && entskb->tstamp) { 584 struct nfqnl_msg_packet_timestamp ts; 585 struct timespec64 kts = ktime_to_timespec64(entskb->tstamp); 586 587 ts.sec = cpu_to_be64(kts.tv_sec); 588 ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC); 589 590 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) 591 goto nla_put_failure; 592 } 593 594 if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk && 595 nfqnl_put_sk_uidgid(skb, entskb->sk) < 0) 596 goto nla_put_failure; 597 598 if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata)) 599 goto nla_put_failure; 600 601 if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0) 602 goto nla_put_failure; 603 604 if (cap_len > data_len && 605 nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) 606 goto nla_put_failure; 607 608 if (nfqnl_put_packet_info(skb, entskb, csum_verify)) 609 goto nla_put_failure; 610 611 if (data_len) { 612 struct nlattr *nla; 613 614 if (skb_tailroom(skb) < sizeof(*nla) + hlen) 615 goto nla_put_failure; 616 617 nla = skb_put(skb, sizeof(*nla)); 618 nla->nla_type = NFQA_PAYLOAD; 619 nla->nla_len = nla_attr_size(data_len); 620 621 if (skb_zerocopy(skb, entskb, data_len, hlen)) 622 goto nla_put_failure; 623 } 624 625 nlh->nlmsg_len = skb->len; 626 if (seclen) 627 security_release_secctx(secdata, seclen); 628 return skb; 629 630 nla_put_failure: 631 skb_tx_error(entskb); 632 kfree_skb(skb); 633 net_err_ratelimited("nf_queue: error creating packet message\n"); 634 nlmsg_failure: 635 if (seclen) 636 security_release_secctx(secdata, seclen); 637 return NULL; 638 } 639 640 static bool nf_ct_drop_unconfirmed(const struct nf_queue_entry *entry) 641 { 642 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 643 static const unsigned long flags = IPS_CONFIRMED | IPS_DYING; 644 const struct nf_conn *ct = (void *)skb_nfct(entry->skb); 645 646 if (ct && ((ct->status & flags) == IPS_DYING)) 647 return true; 648 #endif 649 return false; 650 } 651 652 static int 653 __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, 654 struct nf_queue_entry *entry) 655 { 656 struct sk_buff *nskb; 657 int err = -ENOBUFS; 658 __be32 *packet_id_ptr; 659 int failopen = 0; 660 661 nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr); 662 if (nskb == NULL) { 663 err = -ENOMEM; 664 goto err_out; 665 } 666 spin_lock_bh(&queue->lock); 667 668 if (nf_ct_drop_unconfirmed(entry)) 669 goto err_out_free_nskb; 670 671 if (queue->queue_total >= queue->queue_maxlen) { 672 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { 673 failopen = 1; 674 err = 0; 675 } else { 676 queue->queue_dropped++; 677 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", 678 queue->queue_total); 679 } 680 goto err_out_free_nskb; 681 } 682 entry->id = ++queue->id_sequence; 683 *packet_id_ptr = htonl(entry->id); 684 685 /* nfnetlink_unicast will either free the nskb or add it to a socket */ 686 err = nfnetlink_unicast(nskb, net, queue->peer_portid); 687 if (err < 0) { 688 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { 689 failopen = 1; 690 err = 0; 691 } else { 692 queue->queue_user_dropped++; 693 } 694 goto err_out_unlock; 695 } 696 697 __enqueue_entry(queue, entry); 698 699 spin_unlock_bh(&queue->lock); 700 return 0; 701 702 err_out_free_nskb: 703 kfree_skb(nskb); 704 err_out_unlock: 705 spin_unlock_bh(&queue->lock); 706 if (failopen) 707 nfqnl_reinject(entry, NF_ACCEPT); 708 err_out: 709 return err; 710 } 711 712 static struct nf_queue_entry * 713 nf_queue_entry_dup(struct nf_queue_entry *e) 714 { 715 struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); 716 if (entry) 717 nf_queue_entry_get_refs(entry); 718 return entry; 719 } 720 721 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 722 /* When called from bridge netfilter, skb->data must point to MAC header 723 * before calling skb_gso_segment(). Else, original MAC header is lost 724 * and segmented skbs will be sent to wrong destination. 725 */ 726 static void nf_bridge_adjust_skb_data(struct sk_buff *skb) 727 { 728 if (nf_bridge_info_get(skb)) 729 __skb_push(skb, skb->network_header - skb->mac_header); 730 } 731 732 static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) 733 { 734 if (nf_bridge_info_get(skb)) 735 __skb_pull(skb, skb->network_header - skb->mac_header); 736 } 737 #else 738 #define nf_bridge_adjust_skb_data(s) do {} while (0) 739 #define nf_bridge_adjust_segmented_data(s) do {} while (0) 740 #endif 741 742 static int 743 __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue, 744 struct sk_buff *skb, struct nf_queue_entry *entry) 745 { 746 int ret = -ENOMEM; 747 struct nf_queue_entry *entry_seg; 748 749 nf_bridge_adjust_segmented_data(skb); 750 751 if (skb->next == NULL) { /* last packet, no need to copy entry */ 752 struct sk_buff *gso_skb = entry->skb; 753 entry->skb = skb; 754 ret = __nfqnl_enqueue_packet(net, queue, entry); 755 if (ret) 756 entry->skb = gso_skb; 757 return ret; 758 } 759 760 skb_mark_not_on_list(skb); 761 762 entry_seg = nf_queue_entry_dup(entry); 763 if (entry_seg) { 764 entry_seg->skb = skb; 765 ret = __nfqnl_enqueue_packet(net, queue, entry_seg); 766 if (ret) 767 nf_queue_entry_free(entry_seg); 768 } 769 return ret; 770 } 771 772 static int 773 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) 774 { 775 unsigned int queued; 776 struct nfqnl_instance *queue; 777 struct sk_buff *skb, *segs, *nskb; 778 int err = -ENOBUFS; 779 struct net *net = entry->state.net; 780 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 781 782 /* rcu_read_lock()ed by nf_hook_thresh */ 783 queue = instance_lookup(q, queuenum); 784 if (!queue) 785 return -ESRCH; 786 787 if (queue->copy_mode == NFQNL_COPY_NONE) 788 return -EINVAL; 789 790 skb = entry->skb; 791 792 switch (entry->state.pf) { 793 case NFPROTO_IPV4: 794 skb->protocol = htons(ETH_P_IP); 795 break; 796 case NFPROTO_IPV6: 797 skb->protocol = htons(ETH_P_IPV6); 798 break; 799 } 800 801 if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb)) 802 return __nfqnl_enqueue_packet(net, queue, entry); 803 804 nf_bridge_adjust_skb_data(skb); 805 segs = skb_gso_segment(skb, 0); 806 /* Does not use PTR_ERR to limit the number of error codes that can be 807 * returned by nf_queue. For instance, callers rely on -ESRCH to 808 * mean 'ignore this hook'. 809 */ 810 if (IS_ERR_OR_NULL(segs)) 811 goto out_err; 812 queued = 0; 813 err = 0; 814 skb_list_walk_safe(segs, segs, nskb) { 815 if (err == 0) 816 err = __nfqnl_enqueue_packet_gso(net, queue, 817 segs, entry); 818 if (err == 0) 819 queued++; 820 else 821 kfree_skb(segs); 822 } 823 824 if (queued) { 825 if (err) /* some segments are already queued */ 826 nf_queue_entry_free(entry); 827 kfree_skb(skb); 828 return 0; 829 } 830 out_err: 831 nf_bridge_adjust_segmented_data(skb); 832 return err; 833 } 834 835 static int 836 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) 837 { 838 struct sk_buff *nskb; 839 840 if (diff < 0) { 841 if (pskb_trim(e->skb, data_len)) 842 return -ENOMEM; 843 } else if (diff > 0) { 844 if (data_len > 0xFFFF) 845 return -EINVAL; 846 if (diff > skb_tailroom(e->skb)) { 847 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), 848 diff, GFP_ATOMIC); 849 if (!nskb) 850 return -ENOMEM; 851 kfree_skb(e->skb); 852 e->skb = nskb; 853 } 854 skb_put(e->skb, diff); 855 } 856 if (skb_ensure_writable(e->skb, data_len)) 857 return -ENOMEM; 858 skb_copy_to_linear_data(e->skb, data, data_len); 859 e->skb->ip_summed = CHECKSUM_NONE; 860 return 0; 861 } 862 863 static int 864 nfqnl_set_mode(struct nfqnl_instance *queue, 865 unsigned char mode, unsigned int range) 866 { 867 int status = 0; 868 869 spin_lock_bh(&queue->lock); 870 switch (mode) { 871 case NFQNL_COPY_NONE: 872 case NFQNL_COPY_META: 873 queue->copy_mode = mode; 874 queue->copy_range = 0; 875 break; 876 877 case NFQNL_COPY_PACKET: 878 queue->copy_mode = mode; 879 if (range == 0 || range > NFQNL_MAX_COPY_RANGE) 880 queue->copy_range = NFQNL_MAX_COPY_RANGE; 881 else 882 queue->copy_range = range; 883 break; 884 885 default: 886 status = -EINVAL; 887 888 } 889 spin_unlock_bh(&queue->lock); 890 891 return status; 892 } 893 894 static int 895 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) 896 { 897 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 898 int physinif, physoutif; 899 900 physinif = nf_bridge_get_physinif(entry->skb); 901 physoutif = nf_bridge_get_physoutif(entry->skb); 902 903 if (physinif == ifindex || physoutif == ifindex) 904 return 1; 905 #endif 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; 912 913 return 0; 914 } 915 916 /* drop all packets with either indev or outdev == ifindex from all queue 917 * instances */ 918 static void 919 nfqnl_dev_drop(struct net *net, int ifindex) 920 { 921 int i; 922 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 923 924 rcu_read_lock(); 925 926 for (i = 0; i < INSTANCE_BUCKETS; i++) { 927 struct nfqnl_instance *inst; 928 struct hlist_head *head = &q->instance_table[i]; 929 930 hlist_for_each_entry_rcu(inst, head, hlist) 931 nfqnl_flush(inst, dev_cmp, ifindex); 932 } 933 934 rcu_read_unlock(); 935 } 936 937 static int 938 nfqnl_rcv_dev_event(struct notifier_block *this, 939 unsigned long event, void *ptr) 940 { 941 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 942 943 /* Drop any packets associated with the downed device */ 944 if (event == NETDEV_DOWN) 945 nfqnl_dev_drop(dev_net(dev), dev->ifindex); 946 return NOTIFY_DONE; 947 } 948 949 static struct notifier_block nfqnl_dev_notifier = { 950 .notifier_call = nfqnl_rcv_dev_event, 951 }; 952 953 static void nfqnl_nf_hook_drop(struct net *net) 954 { 955 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 956 int i; 957 958 for (i = 0; i < INSTANCE_BUCKETS; i++) { 959 struct nfqnl_instance *inst; 960 struct hlist_head *head = &q->instance_table[i]; 961 962 hlist_for_each_entry_rcu(inst, head, hlist) 963 nfqnl_flush(inst, NULL, 0); 964 } 965 } 966 967 static int 968 nfqnl_rcv_nl_event(struct notifier_block *this, 969 unsigned long event, void *ptr) 970 { 971 struct netlink_notify *n = ptr; 972 struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); 973 974 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { 975 int i; 976 977 /* destroy all instances for this portid */ 978 spin_lock(&q->instances_lock); 979 for (i = 0; i < INSTANCE_BUCKETS; i++) { 980 struct hlist_node *t2; 981 struct nfqnl_instance *inst; 982 struct hlist_head *head = &q->instance_table[i]; 983 984 hlist_for_each_entry_safe(inst, t2, head, hlist) { 985 if (n->portid == inst->peer_portid) 986 __instance_destroy(inst); 987 } 988 } 989 spin_unlock(&q->instances_lock); 990 } 991 return NOTIFY_DONE; 992 } 993 994 static struct notifier_block nfqnl_rtnl_notifier = { 995 .notifier_call = nfqnl_rcv_nl_event, 996 }; 997 998 static const struct nla_policy nfqa_vlan_policy[NFQA_VLAN_MAX + 1] = { 999 [NFQA_VLAN_TCI] = { .type = NLA_U16}, 1000 [NFQA_VLAN_PROTO] = { .type = NLA_U16}, 1001 }; 1002 1003 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { 1004 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, 1005 [NFQA_MARK] = { .type = NLA_U32 }, 1006 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, 1007 [NFQA_CT] = { .type = NLA_UNSPEC }, 1008 [NFQA_EXP] = { .type = NLA_UNSPEC }, 1009 [NFQA_VLAN] = { .type = NLA_NESTED }, 1010 }; 1011 1012 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { 1013 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, 1014 [NFQA_MARK] = { .type = NLA_U32 }, 1015 }; 1016 1017 static struct nfqnl_instance * 1018 verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid) 1019 { 1020 struct nfqnl_instance *queue; 1021 1022 queue = instance_lookup(q, queue_num); 1023 if (!queue) 1024 return ERR_PTR(-ENODEV); 1025 1026 if (queue->peer_portid != nlportid) 1027 return ERR_PTR(-EPERM); 1028 1029 return queue; 1030 } 1031 1032 static struct nfqnl_msg_verdict_hdr* 1033 verdicthdr_get(const struct nlattr * const nfqa[]) 1034 { 1035 struct nfqnl_msg_verdict_hdr *vhdr; 1036 unsigned int verdict; 1037 1038 if (!nfqa[NFQA_VERDICT_HDR]) 1039 return NULL; 1040 1041 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); 1042 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; 1043 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) 1044 return NULL; 1045 return vhdr; 1046 } 1047 1048 static int nfq_id_after(unsigned int id, unsigned int max) 1049 { 1050 return (int)(id - max) > 0; 1051 } 1052 1053 static int nfqnl_recv_verdict_batch(struct net *net, struct sock *ctnl, 1054 struct sk_buff *skb, 1055 const struct nlmsghdr *nlh, 1056 const struct nlattr * const nfqa[], 1057 struct netlink_ext_ack *extack) 1058 { 1059 struct nfgenmsg *nfmsg = nlmsg_data(nlh); 1060 struct nf_queue_entry *entry, *tmp; 1061 unsigned int verdict, maxid; 1062 struct nfqnl_msg_verdict_hdr *vhdr; 1063 struct nfqnl_instance *queue; 1064 LIST_HEAD(batch_list); 1065 u16 queue_num = ntohs(nfmsg->res_id); 1066 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1067 1068 queue = verdict_instance_lookup(q, queue_num, 1069 NETLINK_CB(skb).portid); 1070 if (IS_ERR(queue)) 1071 return PTR_ERR(queue); 1072 1073 vhdr = verdicthdr_get(nfqa); 1074 if (!vhdr) 1075 return -EINVAL; 1076 1077 verdict = ntohl(vhdr->verdict); 1078 maxid = ntohl(vhdr->id); 1079 1080 spin_lock_bh(&queue->lock); 1081 1082 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { 1083 if (nfq_id_after(entry->id, maxid)) 1084 break; 1085 __dequeue_entry(queue, entry); 1086 list_add_tail(&entry->list, &batch_list); 1087 } 1088 1089 spin_unlock_bh(&queue->lock); 1090 1091 if (list_empty(&batch_list)) 1092 return -ENOENT; 1093 1094 list_for_each_entry_safe(entry, tmp, &batch_list, list) { 1095 if (nfqa[NFQA_MARK]) 1096 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); 1097 1098 nfqnl_reinject(entry, verdict); 1099 } 1100 return 0; 1101 } 1102 1103 static struct nf_conn *nfqnl_ct_parse(struct nfnl_ct_hook *nfnl_ct, 1104 const struct nlmsghdr *nlh, 1105 const struct nlattr * const nfqa[], 1106 struct nf_queue_entry *entry, 1107 enum ip_conntrack_info *ctinfo) 1108 { 1109 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 1110 struct nf_conn *ct; 1111 1112 ct = nf_ct_get(entry->skb, ctinfo); 1113 if (ct == NULL) 1114 return NULL; 1115 1116 if (nfnl_ct->parse(nfqa[NFQA_CT], ct) < 0) 1117 return NULL; 1118 1119 if (nfqa[NFQA_EXP]) 1120 nfnl_ct->attach_expect(nfqa[NFQA_EXP], ct, 1121 NETLINK_CB(entry->skb).portid, 1122 nlmsg_report(nlh)); 1123 return ct; 1124 #else 1125 return NULL; 1126 #endif 1127 } 1128 1129 static int nfqa_parse_bridge(struct nf_queue_entry *entry, 1130 const struct nlattr * const nfqa[]) 1131 { 1132 if (nfqa[NFQA_VLAN]) { 1133 struct nlattr *tb[NFQA_VLAN_MAX + 1]; 1134 int err; 1135 1136 err = nla_parse_nested_deprecated(tb, NFQA_VLAN_MAX, 1137 nfqa[NFQA_VLAN], 1138 nfqa_vlan_policy, NULL); 1139 if (err < 0) 1140 return err; 1141 1142 if (!tb[NFQA_VLAN_TCI] || !tb[NFQA_VLAN_PROTO]) 1143 return -EINVAL; 1144 1145 __vlan_hwaccel_put_tag(entry->skb, 1146 nla_get_be16(tb[NFQA_VLAN_PROTO]), 1147 ntohs(nla_get_be16(tb[NFQA_VLAN_TCI]))); 1148 } 1149 1150 if (nfqa[NFQA_L2HDR]) { 1151 int mac_header_len = entry->skb->network_header - 1152 entry->skb->mac_header; 1153 1154 if (mac_header_len != nla_len(nfqa[NFQA_L2HDR])) 1155 return -EINVAL; 1156 else if (mac_header_len > 0) 1157 memcpy(skb_mac_header(entry->skb), 1158 nla_data(nfqa[NFQA_L2HDR]), 1159 mac_header_len); 1160 } 1161 1162 return 0; 1163 } 1164 1165 static int nfqnl_recv_verdict(struct net *net, struct sock *ctnl, 1166 struct sk_buff *skb, 1167 const struct nlmsghdr *nlh, 1168 const struct nlattr * const nfqa[], 1169 struct netlink_ext_ack *extack) 1170 { 1171 struct nfgenmsg *nfmsg = nlmsg_data(nlh); 1172 u_int16_t queue_num = ntohs(nfmsg->res_id); 1173 struct nfqnl_msg_verdict_hdr *vhdr; 1174 struct nfqnl_instance *queue; 1175 unsigned int verdict; 1176 struct nf_queue_entry *entry; 1177 enum ip_conntrack_info ctinfo; 1178 struct nfnl_ct_hook *nfnl_ct; 1179 struct nf_conn *ct = NULL; 1180 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1181 int err; 1182 1183 queue = verdict_instance_lookup(q, queue_num, 1184 NETLINK_CB(skb).portid); 1185 if (IS_ERR(queue)) 1186 return PTR_ERR(queue); 1187 1188 vhdr = verdicthdr_get(nfqa); 1189 if (!vhdr) 1190 return -EINVAL; 1191 1192 verdict = ntohl(vhdr->verdict); 1193 1194 entry = find_dequeue_entry(queue, ntohl(vhdr->id)); 1195 if (entry == NULL) 1196 return -ENOENT; 1197 1198 /* rcu lock already held from nfnl->call_rcu. */ 1199 nfnl_ct = rcu_dereference(nfnl_ct_hook); 1200 1201 if (nfqa[NFQA_CT]) { 1202 if (nfnl_ct != NULL) 1203 ct = nfqnl_ct_parse(nfnl_ct, nlh, nfqa, entry, &ctinfo); 1204 } 1205 1206 if (entry->state.pf == PF_BRIDGE) { 1207 err = nfqa_parse_bridge(entry, nfqa); 1208 if (err < 0) 1209 return err; 1210 } 1211 1212 if (nfqa[NFQA_PAYLOAD]) { 1213 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); 1214 int diff = payload_len - entry->skb->len; 1215 1216 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), 1217 payload_len, entry, diff) < 0) 1218 verdict = NF_DROP; 1219 1220 if (ct && diff) 1221 nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff); 1222 } 1223 1224 if (nfqa[NFQA_MARK]) 1225 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); 1226 1227 nfqnl_reinject(entry, verdict); 1228 return 0; 1229 } 1230 1231 static int nfqnl_recv_unsupp(struct net *net, struct sock *ctnl, 1232 struct sk_buff *skb, const struct nlmsghdr *nlh, 1233 const struct nlattr * const nfqa[], 1234 struct netlink_ext_ack *extack) 1235 { 1236 return -ENOTSUPP; 1237 } 1238 1239 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { 1240 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, 1241 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, 1242 [NFQA_CFG_QUEUE_MAXLEN] = { .type = NLA_U32 }, 1243 [NFQA_CFG_MASK] = { .type = NLA_U32 }, 1244 [NFQA_CFG_FLAGS] = { .type = NLA_U32 }, 1245 }; 1246 1247 static const struct nf_queue_handler nfqh = { 1248 .outfn = nfqnl_enqueue_packet, 1249 .nf_hook_drop = nfqnl_nf_hook_drop, 1250 }; 1251 1252 static int nfqnl_recv_config(struct net *net, struct sock *ctnl, 1253 struct sk_buff *skb, const struct nlmsghdr *nlh, 1254 const struct nlattr * const nfqa[], 1255 struct netlink_ext_ack *extack) 1256 { 1257 struct nfgenmsg *nfmsg = nlmsg_data(nlh); 1258 u_int16_t queue_num = ntohs(nfmsg->res_id); 1259 struct nfqnl_instance *queue; 1260 struct nfqnl_msg_config_cmd *cmd = NULL; 1261 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1262 __u32 flags = 0, mask = 0; 1263 int ret = 0; 1264 1265 if (nfqa[NFQA_CFG_CMD]) { 1266 cmd = nla_data(nfqa[NFQA_CFG_CMD]); 1267 1268 /* Obsolete commands without queue context */ 1269 switch (cmd->command) { 1270 case NFQNL_CFG_CMD_PF_BIND: return 0; 1271 case NFQNL_CFG_CMD_PF_UNBIND: return 0; 1272 } 1273 } 1274 1275 /* Check if we support these flags in first place, dependencies should 1276 * be there too not to break atomicity. 1277 */ 1278 if (nfqa[NFQA_CFG_FLAGS]) { 1279 if (!nfqa[NFQA_CFG_MASK]) { 1280 /* A mask is needed to specify which flags are being 1281 * changed. 1282 */ 1283 return -EINVAL; 1284 } 1285 1286 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); 1287 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); 1288 1289 if (flags >= NFQA_CFG_F_MAX) 1290 return -EOPNOTSUPP; 1291 1292 #if !IS_ENABLED(CONFIG_NETWORK_SECMARK) 1293 if (flags & mask & NFQA_CFG_F_SECCTX) 1294 return -EOPNOTSUPP; 1295 #endif 1296 if ((flags & mask & NFQA_CFG_F_CONNTRACK) && 1297 !rcu_access_pointer(nfnl_ct_hook)) { 1298 #ifdef CONFIG_MODULES 1299 nfnl_unlock(NFNL_SUBSYS_QUEUE); 1300 request_module("ip_conntrack_netlink"); 1301 nfnl_lock(NFNL_SUBSYS_QUEUE); 1302 if (rcu_access_pointer(nfnl_ct_hook)) 1303 return -EAGAIN; 1304 #endif 1305 return -EOPNOTSUPP; 1306 } 1307 } 1308 1309 rcu_read_lock(); 1310 queue = instance_lookup(q, queue_num); 1311 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { 1312 ret = -EPERM; 1313 goto err_out_unlock; 1314 } 1315 1316 if (cmd != NULL) { 1317 switch (cmd->command) { 1318 case NFQNL_CFG_CMD_BIND: 1319 if (queue) { 1320 ret = -EBUSY; 1321 goto err_out_unlock; 1322 } 1323 queue = instance_create(q, queue_num, 1324 NETLINK_CB(skb).portid); 1325 if (IS_ERR(queue)) { 1326 ret = PTR_ERR(queue); 1327 goto err_out_unlock; 1328 } 1329 break; 1330 case NFQNL_CFG_CMD_UNBIND: 1331 if (!queue) { 1332 ret = -ENODEV; 1333 goto err_out_unlock; 1334 } 1335 instance_destroy(q, queue); 1336 goto err_out_unlock; 1337 case NFQNL_CFG_CMD_PF_BIND: 1338 case NFQNL_CFG_CMD_PF_UNBIND: 1339 break; 1340 default: 1341 ret = -ENOTSUPP; 1342 goto err_out_unlock; 1343 } 1344 } 1345 1346 if (!queue) { 1347 ret = -ENODEV; 1348 goto err_out_unlock; 1349 } 1350 1351 if (nfqa[NFQA_CFG_PARAMS]) { 1352 struct nfqnl_msg_config_params *params = 1353 nla_data(nfqa[NFQA_CFG_PARAMS]); 1354 1355 nfqnl_set_mode(queue, params->copy_mode, 1356 ntohl(params->copy_range)); 1357 } 1358 1359 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { 1360 __be32 *queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); 1361 1362 spin_lock_bh(&queue->lock); 1363 queue->queue_maxlen = ntohl(*queue_maxlen); 1364 spin_unlock_bh(&queue->lock); 1365 } 1366 1367 if (nfqa[NFQA_CFG_FLAGS]) { 1368 spin_lock_bh(&queue->lock); 1369 queue->flags &= ~mask; 1370 queue->flags |= flags & mask; 1371 spin_unlock_bh(&queue->lock); 1372 } 1373 1374 err_out_unlock: 1375 rcu_read_unlock(); 1376 return ret; 1377 } 1378 1379 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { 1380 [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, 1381 .attr_count = NFQA_MAX, }, 1382 [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, 1383 .attr_count = NFQA_MAX, 1384 .policy = nfqa_verdict_policy }, 1385 [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, 1386 .attr_count = NFQA_CFG_MAX, 1387 .policy = nfqa_cfg_policy }, 1388 [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, 1389 .attr_count = NFQA_MAX, 1390 .policy = nfqa_verdict_batch_policy }, 1391 }; 1392 1393 static const struct nfnetlink_subsystem nfqnl_subsys = { 1394 .name = "nf_queue", 1395 .subsys_id = NFNL_SUBSYS_QUEUE, 1396 .cb_count = NFQNL_MSG_MAX, 1397 .cb = nfqnl_cb, 1398 }; 1399 1400 #ifdef CONFIG_PROC_FS 1401 struct iter_state { 1402 struct seq_net_private p; 1403 unsigned int bucket; 1404 }; 1405 1406 static struct hlist_node *get_first(struct seq_file *seq) 1407 { 1408 struct iter_state *st = seq->private; 1409 struct net *net; 1410 struct nfnl_queue_net *q; 1411 1412 if (!st) 1413 return NULL; 1414 1415 net = seq_file_net(seq); 1416 q = nfnl_queue_pernet(net); 1417 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { 1418 if (!hlist_empty(&q->instance_table[st->bucket])) 1419 return q->instance_table[st->bucket].first; 1420 } 1421 return NULL; 1422 } 1423 1424 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) 1425 { 1426 struct iter_state *st = seq->private; 1427 struct net *net = seq_file_net(seq); 1428 1429 h = h->next; 1430 while (!h) { 1431 struct nfnl_queue_net *q; 1432 1433 if (++st->bucket >= INSTANCE_BUCKETS) 1434 return NULL; 1435 1436 q = nfnl_queue_pernet(net); 1437 h = q->instance_table[st->bucket].first; 1438 } 1439 return h; 1440 } 1441 1442 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) 1443 { 1444 struct hlist_node *head; 1445 head = get_first(seq); 1446 1447 if (head) 1448 while (pos && (head = get_next(seq, head))) 1449 pos--; 1450 return pos ? NULL : head; 1451 } 1452 1453 static void *seq_start(struct seq_file *s, loff_t *pos) 1454 __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) 1455 { 1456 spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); 1457 return get_idx(s, *pos); 1458 } 1459 1460 static void *seq_next(struct seq_file *s, void *v, loff_t *pos) 1461 { 1462 (*pos)++; 1463 return get_next(s, v); 1464 } 1465 1466 static void seq_stop(struct seq_file *s, void *v) 1467 __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) 1468 { 1469 spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); 1470 } 1471 1472 static int seq_show(struct seq_file *s, void *v) 1473 { 1474 const struct nfqnl_instance *inst = v; 1475 1476 seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n", 1477 inst->queue_num, 1478 inst->peer_portid, inst->queue_total, 1479 inst->copy_mode, inst->copy_range, 1480 inst->queue_dropped, inst->queue_user_dropped, 1481 inst->id_sequence, 1); 1482 return 0; 1483 } 1484 1485 static const struct seq_operations nfqnl_seq_ops = { 1486 .start = seq_start, 1487 .next = seq_next, 1488 .stop = seq_stop, 1489 .show = seq_show, 1490 }; 1491 #endif /* PROC_FS */ 1492 1493 static int __net_init nfnl_queue_net_init(struct net *net) 1494 { 1495 unsigned int i; 1496 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1497 1498 for (i = 0; i < INSTANCE_BUCKETS; i++) 1499 INIT_HLIST_HEAD(&q->instance_table[i]); 1500 1501 spin_lock_init(&q->instances_lock); 1502 1503 #ifdef CONFIG_PROC_FS 1504 if (!proc_create_net("nfnetlink_queue", 0440, net->nf.proc_netfilter, 1505 &nfqnl_seq_ops, sizeof(struct iter_state))) 1506 return -ENOMEM; 1507 #endif 1508 nf_register_queue_handler(net, &nfqh); 1509 return 0; 1510 } 1511 1512 static void __net_exit nfnl_queue_net_exit(struct net *net) 1513 { 1514 struct nfnl_queue_net *q = nfnl_queue_pernet(net); 1515 unsigned int i; 1516 1517 nf_unregister_queue_handler(net); 1518 #ifdef CONFIG_PROC_FS 1519 remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); 1520 #endif 1521 for (i = 0; i < INSTANCE_BUCKETS; i++) 1522 WARN_ON_ONCE(!hlist_empty(&q->instance_table[i])); 1523 } 1524 1525 static void nfnl_queue_net_exit_batch(struct list_head *net_exit_list) 1526 { 1527 synchronize_rcu(); 1528 } 1529 1530 static struct pernet_operations nfnl_queue_net_ops = { 1531 .init = nfnl_queue_net_init, 1532 .exit = nfnl_queue_net_exit, 1533 .exit_batch = nfnl_queue_net_exit_batch, 1534 .id = &nfnl_queue_net_id, 1535 .size = sizeof(struct nfnl_queue_net), 1536 }; 1537 1538 static int __init nfnetlink_queue_init(void) 1539 { 1540 int status; 1541 1542 status = register_pernet_subsys(&nfnl_queue_net_ops); 1543 if (status < 0) { 1544 pr_err("failed to register pernet ops\n"); 1545 goto out; 1546 } 1547 1548 netlink_register_notifier(&nfqnl_rtnl_notifier); 1549 status = nfnetlink_subsys_register(&nfqnl_subsys); 1550 if (status < 0) { 1551 pr_err("failed to create netlink socket\n"); 1552 goto cleanup_netlink_notifier; 1553 } 1554 1555 status = register_netdevice_notifier(&nfqnl_dev_notifier); 1556 if (status < 0) { 1557 pr_err("failed to register netdevice notifier\n"); 1558 goto cleanup_netlink_subsys; 1559 } 1560 1561 return status; 1562 1563 cleanup_netlink_subsys: 1564 nfnetlink_subsys_unregister(&nfqnl_subsys); 1565 cleanup_netlink_notifier: 1566 netlink_unregister_notifier(&nfqnl_rtnl_notifier); 1567 unregister_pernet_subsys(&nfnl_queue_net_ops); 1568 out: 1569 return status; 1570 } 1571 1572 static void __exit nfnetlink_queue_fini(void) 1573 { 1574 unregister_netdevice_notifier(&nfqnl_dev_notifier); 1575 nfnetlink_subsys_unregister(&nfqnl_subsys); 1576 netlink_unregister_notifier(&nfqnl_rtnl_notifier); 1577 unregister_pernet_subsys(&nfnl_queue_net_ops); 1578 1579 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1580 } 1581 1582 MODULE_DESCRIPTION("netfilter packet queue handler"); 1583 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); 1584 MODULE_LICENSE("GPL"); 1585 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); 1586 1587 module_init(nfnetlink_queue_init); 1588 module_exit(nfnetlink_queue_fini); 1589