Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This is a module which is used for queueing packets and communicating with |
| 3 | * userspace via nfetlink. |
| 4 | * |
| 5 | * (C) 2005 by Harald Welte <laforge@netfilter.org> |
| 6 | * |
| 7 | * Based on the old ipv4-only ip_queue.c: |
| 8 | * (C) 2000-2002 James Morris <jmorris@intercode.com.au> |
| 9 | * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org> |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License version 2 as |
| 13 | * published by the Free Software Foundation. |
| 14 | * |
| 15 | */ |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/skbuff.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/spinlock.h> |
| 20 | #include <linux/notifier.h> |
| 21 | #include <linux/netdevice.h> |
| 22 | #include <linux/netfilter.h> |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 23 | #include <linux/proc_fs.h> |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 24 | #include <linux/netfilter_ipv4.h> |
| 25 | #include <linux/netfilter_ipv6.h> |
| 26 | #include <linux/netfilter/nfnetlink.h> |
| 27 | #include <linux/netfilter/nfnetlink_queue.h> |
| 28 | #include <linux/list.h> |
| 29 | #include <net/sock.h> |
| 30 | |
| 31 | #include <asm/atomic.h> |
| 32 | |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 33 | #ifdef CONFIG_BRIDGE_NETFILTER |
| 34 | #include "../bridge/br_private.h" |
| 35 | #endif |
| 36 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 37 | #define NFQNL_QMAX_DEFAULT 1024 |
| 38 | |
| 39 | #if 0 |
| 40 | #define QDEBUG(x, args ...) printk(KERN_DEBUG "%s(%d):%s(): " x, \ |
| 41 | __FILE__, __LINE__, __FUNCTION__, \ |
| 42 | ## args) |
| 43 | #else |
| 44 | #define QDEBUG(x, ...) |
| 45 | #endif |
| 46 | |
| 47 | struct nfqnl_queue_entry { |
| 48 | struct list_head list; |
| 49 | struct nf_info *info; |
| 50 | struct sk_buff *skb; |
| 51 | unsigned int id; |
| 52 | }; |
| 53 | |
| 54 | struct nfqnl_instance { |
| 55 | struct hlist_node hlist; /* global list of queues */ |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 56 | atomic_t use; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 57 | |
| 58 | int peer_pid; |
| 59 | unsigned int queue_maxlen; |
| 60 | unsigned int copy_range; |
| 61 | unsigned int queue_total; |
| 62 | unsigned int queue_dropped; |
| 63 | unsigned int queue_user_dropped; |
| 64 | |
| 65 | atomic_t id_sequence; /* 'sequence' of pkt ids */ |
| 66 | |
| 67 | u_int16_t queue_num; /* number of this queue */ |
| 68 | u_int8_t copy_mode; |
| 69 | |
| 70 | spinlock_t lock; |
| 71 | |
| 72 | struct list_head queue_list; /* packets in queue */ |
| 73 | }; |
| 74 | |
| 75 | typedef int (*nfqnl_cmpfn)(struct nfqnl_queue_entry *, unsigned long); |
| 76 | |
| 77 | static DEFINE_RWLOCK(instances_lock); |
| 78 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 79 | #define INSTANCE_BUCKETS 16 |
| 80 | static struct hlist_head instance_table[INSTANCE_BUCKETS]; |
| 81 | |
| 82 | static inline u_int8_t instance_hashfn(u_int16_t queue_num) |
| 83 | { |
| 84 | return ((queue_num >> 8) | queue_num) % INSTANCE_BUCKETS; |
| 85 | } |
| 86 | |
| 87 | static struct nfqnl_instance * |
| 88 | __instance_lookup(u_int16_t queue_num) |
| 89 | { |
| 90 | struct hlist_head *head; |
| 91 | struct hlist_node *pos; |
| 92 | struct nfqnl_instance *inst; |
| 93 | |
| 94 | head = &instance_table[instance_hashfn(queue_num)]; |
| 95 | hlist_for_each_entry(inst, pos, head, hlist) { |
| 96 | if (inst->queue_num == queue_num) |
| 97 | return inst; |
| 98 | } |
| 99 | return NULL; |
| 100 | } |
| 101 | |
| 102 | static struct nfqnl_instance * |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 103 | instance_lookup_get(u_int16_t queue_num) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 104 | { |
| 105 | struct nfqnl_instance *inst; |
| 106 | |
| 107 | read_lock_bh(&instances_lock); |
| 108 | inst = __instance_lookup(queue_num); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 109 | if (inst) |
| 110 | atomic_inc(&inst->use); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 111 | read_unlock_bh(&instances_lock); |
| 112 | |
| 113 | return inst; |
| 114 | } |
| 115 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 116 | static void |
| 117 | instance_put(struct nfqnl_instance *inst) |
| 118 | { |
| 119 | if (inst && atomic_dec_and_test(&inst->use)) { |
| 120 | QDEBUG("kfree(inst=%p)\n", inst); |
| 121 | kfree(inst); |
| 122 | } |
| 123 | } |
| 124 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 125 | static struct nfqnl_instance * |
| 126 | instance_create(u_int16_t queue_num, int pid) |
| 127 | { |
| 128 | struct nfqnl_instance *inst; |
| 129 | |
| 130 | QDEBUG("entering for queue_num=%u, pid=%d\n", queue_num, pid); |
| 131 | |
| 132 | write_lock_bh(&instances_lock); |
| 133 | if (__instance_lookup(queue_num)) { |
| 134 | inst = NULL; |
| 135 | QDEBUG("aborting, instance already exists\n"); |
| 136 | goto out_unlock; |
| 137 | } |
| 138 | |
Harald Welte | 10dfdc6 | 2005-11-03 19:20:07 +0100 | [diff] [blame] | 139 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 140 | if (!inst) |
| 141 | goto out_unlock; |
| 142 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 143 | inst->queue_num = queue_num; |
| 144 | inst->peer_pid = pid; |
| 145 | inst->queue_maxlen = NFQNL_QMAX_DEFAULT; |
| 146 | inst->copy_range = 0xfffff; |
| 147 | inst->copy_mode = NFQNL_COPY_NONE; |
| 148 | atomic_set(&inst->id_sequence, 0); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 149 | /* needs to be two, since we _put() after creation */ |
| 150 | atomic_set(&inst->use, 2); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 151 | inst->lock = SPIN_LOCK_UNLOCKED; |
| 152 | INIT_LIST_HEAD(&inst->queue_list); |
| 153 | |
| 154 | if (!try_module_get(THIS_MODULE)) |
| 155 | goto out_free; |
| 156 | |
| 157 | hlist_add_head(&inst->hlist, |
| 158 | &instance_table[instance_hashfn(queue_num)]); |
| 159 | |
| 160 | write_unlock_bh(&instances_lock); |
| 161 | |
| 162 | QDEBUG("successfully created new instance\n"); |
| 163 | |
| 164 | return inst; |
| 165 | |
| 166 | out_free: |
| 167 | kfree(inst); |
| 168 | out_unlock: |
| 169 | write_unlock_bh(&instances_lock); |
| 170 | return NULL; |
| 171 | } |
| 172 | |
| 173 | static void nfqnl_flush(struct nfqnl_instance *queue, int verdict); |
| 174 | |
| 175 | static void |
| 176 | _instance_destroy2(struct nfqnl_instance *inst, int lock) |
| 177 | { |
| 178 | /* first pull it out of the global list */ |
| 179 | if (lock) |
| 180 | write_lock_bh(&instances_lock); |
| 181 | |
| 182 | QDEBUG("removing instance %p (queuenum=%u) from hash\n", |
| 183 | inst, inst->queue_num); |
| 184 | hlist_del(&inst->hlist); |
| 185 | |
| 186 | if (lock) |
| 187 | write_unlock_bh(&instances_lock); |
| 188 | |
| 189 | /* then flush all pending skbs from the queue */ |
| 190 | nfqnl_flush(inst, NF_DROP); |
| 191 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 192 | /* and finally put the refcount */ |
| 193 | instance_put(inst); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 194 | |
| 195 | module_put(THIS_MODULE); |
| 196 | } |
| 197 | |
| 198 | static inline void |
| 199 | __instance_destroy(struct nfqnl_instance *inst) |
| 200 | { |
| 201 | _instance_destroy2(inst, 0); |
| 202 | } |
| 203 | |
| 204 | static inline void |
| 205 | instance_destroy(struct nfqnl_instance *inst) |
| 206 | { |
| 207 | _instance_destroy2(inst, 1); |
| 208 | } |
| 209 | |
| 210 | |
| 211 | |
| 212 | static void |
| 213 | issue_verdict(struct nfqnl_queue_entry *entry, int verdict) |
| 214 | { |
| 215 | QDEBUG("entering for entry %p, verdict %u\n", entry, verdict); |
| 216 | |
| 217 | /* TCP input path (and probably other bits) assume to be called |
| 218 | * from softirq context, not from syscall, like issue_verdict is |
| 219 | * called. TCP input path deadlocks with locks taken from timer |
| 220 | * softirq, e.g. We therefore emulate this by local_bh_disable() */ |
| 221 | |
| 222 | local_bh_disable(); |
| 223 | nf_reinject(entry->skb, entry->info, verdict); |
| 224 | local_bh_enable(); |
| 225 | |
| 226 | kfree(entry); |
| 227 | } |
| 228 | |
| 229 | static inline void |
| 230 | __enqueue_entry(struct nfqnl_instance *queue, |
| 231 | struct nfqnl_queue_entry *entry) |
| 232 | { |
| 233 | list_add(&entry->list, &queue->queue_list); |
| 234 | queue->queue_total++; |
| 235 | } |
| 236 | |
| 237 | /* |
| 238 | * Find and return a queued entry matched by cmpfn, or return the last |
| 239 | * entry if cmpfn is NULL. |
| 240 | */ |
| 241 | static inline struct nfqnl_queue_entry * |
| 242 | __find_entry(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, |
| 243 | unsigned long data) |
| 244 | { |
| 245 | struct list_head *p; |
| 246 | |
| 247 | list_for_each_prev(p, &queue->queue_list) { |
| 248 | struct nfqnl_queue_entry *entry = (struct nfqnl_queue_entry *)p; |
| 249 | |
| 250 | if (!cmpfn || cmpfn(entry, data)) |
| 251 | return entry; |
| 252 | } |
| 253 | return NULL; |
| 254 | } |
| 255 | |
| 256 | static inline void |
| 257 | __dequeue_entry(struct nfqnl_instance *q, struct nfqnl_queue_entry *entry) |
| 258 | { |
| 259 | list_del(&entry->list); |
| 260 | q->queue_total--; |
| 261 | } |
| 262 | |
| 263 | static inline struct nfqnl_queue_entry * |
| 264 | __find_dequeue_entry(struct nfqnl_instance *queue, |
| 265 | nfqnl_cmpfn cmpfn, unsigned long data) |
| 266 | { |
| 267 | struct nfqnl_queue_entry *entry; |
| 268 | |
| 269 | entry = __find_entry(queue, cmpfn, data); |
| 270 | if (entry == NULL) |
| 271 | return NULL; |
| 272 | |
| 273 | __dequeue_entry(queue, entry); |
| 274 | return entry; |
| 275 | } |
| 276 | |
| 277 | |
| 278 | static inline void |
| 279 | __nfqnl_flush(struct nfqnl_instance *queue, int verdict) |
| 280 | { |
| 281 | struct nfqnl_queue_entry *entry; |
| 282 | |
| 283 | while ((entry = __find_dequeue_entry(queue, NULL, 0))) |
| 284 | issue_verdict(entry, verdict); |
| 285 | } |
| 286 | |
| 287 | static inline int |
| 288 | __nfqnl_set_mode(struct nfqnl_instance *queue, |
| 289 | unsigned char mode, unsigned int range) |
| 290 | { |
| 291 | int status = 0; |
| 292 | |
| 293 | switch (mode) { |
| 294 | case NFQNL_COPY_NONE: |
| 295 | case NFQNL_COPY_META: |
| 296 | queue->copy_mode = mode; |
| 297 | queue->copy_range = 0; |
| 298 | break; |
| 299 | |
| 300 | case NFQNL_COPY_PACKET: |
| 301 | queue->copy_mode = mode; |
| 302 | /* we're using struct nfattr which has 16bit nfa_len */ |
| 303 | if (range > 0xffff) |
| 304 | queue->copy_range = 0xffff; |
| 305 | else |
| 306 | queue->copy_range = range; |
| 307 | break; |
| 308 | |
| 309 | default: |
| 310 | status = -EINVAL; |
| 311 | |
| 312 | } |
| 313 | return status; |
| 314 | } |
| 315 | |
| 316 | static struct nfqnl_queue_entry * |
| 317 | find_dequeue_entry(struct nfqnl_instance *queue, |
| 318 | nfqnl_cmpfn cmpfn, unsigned long data) |
| 319 | { |
| 320 | struct nfqnl_queue_entry *entry; |
| 321 | |
| 322 | spin_lock_bh(&queue->lock); |
| 323 | entry = __find_dequeue_entry(queue, cmpfn, data); |
| 324 | spin_unlock_bh(&queue->lock); |
| 325 | |
| 326 | return entry; |
| 327 | } |
| 328 | |
| 329 | static void |
| 330 | nfqnl_flush(struct nfqnl_instance *queue, int verdict) |
| 331 | { |
| 332 | spin_lock_bh(&queue->lock); |
| 333 | __nfqnl_flush(queue, verdict); |
| 334 | spin_unlock_bh(&queue->lock); |
| 335 | } |
| 336 | |
| 337 | static struct sk_buff * |
| 338 | nfqnl_build_packet_message(struct nfqnl_instance *queue, |
| 339 | struct nfqnl_queue_entry *entry, int *errp) |
| 340 | { |
| 341 | unsigned char *old_tail; |
| 342 | size_t size; |
| 343 | size_t data_len = 0; |
| 344 | struct sk_buff *skb; |
| 345 | struct nfqnl_msg_packet_hdr pmsg; |
| 346 | struct nlmsghdr *nlh; |
| 347 | struct nfgenmsg *nfmsg; |
| 348 | unsigned int tmp_uint; |
| 349 | |
| 350 | QDEBUG("entered\n"); |
| 351 | |
| 352 | /* all macros expand to constant values at compile time */ |
| 353 | size = NLMSG_SPACE(sizeof(struct nfqnl_msg_packet_hdr)) |
| 354 | + NLMSG_SPACE(sizeof(u_int32_t)) /* ifindex */ |
| 355 | + NLMSG_SPACE(sizeof(u_int32_t)) /* ifindex */ |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 356 | #ifdef CONFIG_BRIDGE_NETFILTER |
| 357 | + NLMSG_SPACE(sizeof(u_int32_t)) /* ifindex */ |
| 358 | + NLMSG_SPACE(sizeof(u_int32_t)) /* ifindex */ |
| 359 | #endif |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 360 | + NLMSG_SPACE(sizeof(u_int32_t)) /* mark */ |
| 361 | + NLMSG_SPACE(sizeof(struct nfqnl_msg_packet_hw)) |
| 362 | + NLMSG_SPACE(sizeof(struct nfqnl_msg_packet_timestamp)); |
| 363 | |
| 364 | spin_lock_bh(&queue->lock); |
| 365 | |
| 366 | switch (queue->copy_mode) { |
| 367 | case NFQNL_COPY_META: |
| 368 | case NFQNL_COPY_NONE: |
| 369 | data_len = 0; |
| 370 | break; |
| 371 | |
| 372 | case NFQNL_COPY_PACKET: |
Patrick McHardy | e7dfb09 | 2005-09-06 15:10:00 -0700 | [diff] [blame] | 373 | if (entry->skb->ip_summed == CHECKSUM_HW && |
| 374 | (*errp = skb_checksum_help(entry->skb, |
| 375 | entry->info->outdev == NULL))) { |
| 376 | spin_unlock_bh(&queue->lock); |
| 377 | return NULL; |
| 378 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 379 | if (queue->copy_range == 0 |
| 380 | || queue->copy_range > entry->skb->len) |
| 381 | data_len = entry->skb->len; |
| 382 | else |
| 383 | data_len = queue->copy_range; |
| 384 | |
| 385 | size += NLMSG_SPACE(data_len); |
| 386 | break; |
| 387 | |
| 388 | default: |
| 389 | *errp = -EINVAL; |
| 390 | spin_unlock_bh(&queue->lock); |
| 391 | return NULL; |
| 392 | } |
| 393 | |
| 394 | spin_unlock_bh(&queue->lock); |
| 395 | |
| 396 | skb = alloc_skb(size, GFP_ATOMIC); |
| 397 | if (!skb) |
| 398 | goto nlmsg_failure; |
| 399 | |
| 400 | old_tail= skb->tail; |
| 401 | nlh = NLMSG_PUT(skb, 0, 0, |
| 402 | NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, |
| 403 | sizeof(struct nfgenmsg)); |
| 404 | nfmsg = NLMSG_DATA(nlh); |
| 405 | nfmsg->nfgen_family = entry->info->pf; |
| 406 | nfmsg->version = NFNETLINK_V0; |
| 407 | nfmsg->res_id = htons(queue->queue_num); |
| 408 | |
| 409 | pmsg.packet_id = htonl(entry->id); |
| 410 | pmsg.hw_protocol = htons(entry->skb->protocol); |
| 411 | pmsg.hook = entry->info->hook; |
| 412 | |
| 413 | NFA_PUT(skb, NFQA_PACKET_HDR, sizeof(pmsg), &pmsg); |
| 414 | |
| 415 | if (entry->info->indev) { |
| 416 | tmp_uint = htonl(entry->info->indev->ifindex); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 417 | #ifndef CONFIG_BRIDGE_NETFILTER |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 418 | NFA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), &tmp_uint); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 419 | #else |
| 420 | if (entry->info->pf == PF_BRIDGE) { |
| 421 | /* Case 1: indev is physical input device, we need to |
| 422 | * look for bridge group (when called from |
| 423 | * netfilter_bridge) */ |
| 424 | NFA_PUT(skb, NFQA_IFINDEX_PHYSINDEV, sizeof(tmp_uint), |
| 425 | &tmp_uint); |
| 426 | /* this is the bridge group "brX" */ |
| 427 | tmp_uint = htonl(entry->info->indev->br_port->br->dev->ifindex); |
| 428 | NFA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), |
| 429 | &tmp_uint); |
| 430 | } else { |
| 431 | /* Case 2: indev is bridge group, we need to look for |
| 432 | * physical device (when called from ipv4) */ |
| 433 | NFA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), |
| 434 | &tmp_uint); |
| 435 | if (entry->skb->nf_bridge |
| 436 | && entry->skb->nf_bridge->physindev) { |
| 437 | tmp_uint = htonl(entry->skb->nf_bridge->physindev->ifindex); |
| 438 | NFA_PUT(skb, NFQA_IFINDEX_PHYSINDEV, |
| 439 | sizeof(tmp_uint), &tmp_uint); |
| 440 | } |
| 441 | } |
| 442 | #endif |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 443 | } |
| 444 | |
| 445 | if (entry->info->outdev) { |
| 446 | tmp_uint = htonl(entry->info->outdev->ifindex); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 447 | #ifndef CONFIG_BRIDGE_NETFILTER |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 448 | NFA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), &tmp_uint); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 449 | #else |
| 450 | if (entry->info->pf == PF_BRIDGE) { |
| 451 | /* Case 1: outdev is physical output device, we need to |
| 452 | * look for bridge group (when called from |
| 453 | * netfilter_bridge) */ |
| 454 | NFA_PUT(skb, NFQA_IFINDEX_PHYSOUTDEV, sizeof(tmp_uint), |
| 455 | &tmp_uint); |
| 456 | /* this is the bridge group "brX" */ |
| 457 | tmp_uint = htonl(entry->info->outdev->br_port->br->dev->ifindex); |
| 458 | NFA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), |
| 459 | &tmp_uint); |
| 460 | } else { |
| 461 | /* Case 2: outdev is bridge group, we need to look for |
| 462 | * physical output device (when called from ipv4) */ |
| 463 | NFA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), |
| 464 | &tmp_uint); |
| 465 | if (entry->skb->nf_bridge |
| 466 | && entry->skb->nf_bridge->physoutdev) { |
| 467 | tmp_uint = htonl(entry->skb->nf_bridge->physoutdev->ifindex); |
| 468 | NFA_PUT(skb, NFQA_IFINDEX_PHYSOUTDEV, |
| 469 | sizeof(tmp_uint), &tmp_uint); |
| 470 | } |
| 471 | } |
| 472 | #endif |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 473 | } |
| 474 | |
| 475 | if (entry->skb->nfmark) { |
| 476 | tmp_uint = htonl(entry->skb->nfmark); |
| 477 | NFA_PUT(skb, NFQA_MARK, sizeof(u_int32_t), &tmp_uint); |
| 478 | } |
| 479 | |
| 480 | if (entry->info->indev && entry->skb->dev |
| 481 | && entry->skb->dev->hard_header_parse) { |
| 482 | struct nfqnl_msg_packet_hw phw; |
| 483 | |
| 484 | phw.hw_addrlen = |
| 485 | entry->skb->dev->hard_header_parse(entry->skb, |
| 486 | phw.hw_addr); |
| 487 | phw.hw_addrlen = htons(phw.hw_addrlen); |
| 488 | NFA_PUT(skb, NFQA_HWADDR, sizeof(phw), &phw); |
| 489 | } |
| 490 | |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 491 | if (entry->skb->tstamp.off_sec) { |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 492 | struct nfqnl_msg_packet_timestamp ts; |
| 493 | |
Herbert Xu | 325ed82 | 2005-10-03 13:57:23 -0700 | [diff] [blame] | 494 | ts.sec = cpu_to_be64(entry->skb->tstamp.off_sec); |
| 495 | ts.usec = cpu_to_be64(entry->skb->tstamp.off_usec); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 496 | |
| 497 | NFA_PUT(skb, NFQA_TIMESTAMP, sizeof(ts), &ts); |
| 498 | } |
| 499 | |
| 500 | if (data_len) { |
| 501 | struct nfattr *nfa; |
| 502 | int size = NFA_LENGTH(data_len); |
| 503 | |
| 504 | if (skb_tailroom(skb) < (int)NFA_SPACE(data_len)) { |
| 505 | printk(KERN_WARNING "nf_queue: no tailroom!\n"); |
| 506 | goto nlmsg_failure; |
| 507 | } |
| 508 | |
| 509 | nfa = (struct nfattr *)skb_put(skb, NFA_ALIGN(size)); |
| 510 | nfa->nfa_type = NFQA_PAYLOAD; |
| 511 | nfa->nfa_len = size; |
| 512 | |
| 513 | if (skb_copy_bits(entry->skb, 0, NFA_DATA(nfa), data_len)) |
| 514 | BUG(); |
| 515 | } |
| 516 | |
| 517 | nlh->nlmsg_len = skb->tail - old_tail; |
| 518 | return skb; |
| 519 | |
| 520 | nlmsg_failure: |
| 521 | nfattr_failure: |
| 522 | if (skb) |
| 523 | kfree_skb(skb); |
| 524 | *errp = -EINVAL; |
| 525 | if (net_ratelimit()) |
| 526 | printk(KERN_ERR "nf_queue: error creating packet message\n"); |
| 527 | return NULL; |
| 528 | } |
| 529 | |
| 530 | static int |
| 531 | nfqnl_enqueue_packet(struct sk_buff *skb, struct nf_info *info, |
| 532 | unsigned int queuenum, void *data) |
| 533 | { |
| 534 | int status = -EINVAL; |
| 535 | struct sk_buff *nskb; |
| 536 | struct nfqnl_instance *queue; |
| 537 | struct nfqnl_queue_entry *entry; |
| 538 | |
| 539 | QDEBUG("entered\n"); |
| 540 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 541 | queue = instance_lookup_get(queuenum); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 542 | if (!queue) { |
| 543 | QDEBUG("no queue instance matching\n"); |
| 544 | return -EINVAL; |
| 545 | } |
| 546 | |
| 547 | if (queue->copy_mode == NFQNL_COPY_NONE) { |
| 548 | QDEBUG("mode COPY_NONE, aborting\n"); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 549 | status = -EAGAIN; |
| 550 | goto err_out_put; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 551 | } |
| 552 | |
| 553 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); |
| 554 | if (entry == NULL) { |
| 555 | if (net_ratelimit()) |
| 556 | printk(KERN_ERR |
| 557 | "nf_queue: OOM in nfqnl_enqueue_packet()\n"); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 558 | status = -ENOMEM; |
| 559 | goto err_out_put; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 560 | } |
| 561 | |
| 562 | entry->info = info; |
| 563 | entry->skb = skb; |
| 564 | entry->id = atomic_inc_return(&queue->id_sequence); |
| 565 | |
| 566 | nskb = nfqnl_build_packet_message(queue, entry, &status); |
| 567 | if (nskb == NULL) |
| 568 | goto err_out_free; |
| 569 | |
| 570 | spin_lock_bh(&queue->lock); |
| 571 | |
| 572 | if (!queue->peer_pid) |
| 573 | goto err_out_free_nskb; |
| 574 | |
| 575 | if (queue->queue_total >= queue->queue_maxlen) { |
| 576 | queue->queue_dropped++; |
| 577 | status = -ENOSPC; |
| 578 | if (net_ratelimit()) |
| 579 | printk(KERN_WARNING "ip_queue: full at %d entries, " |
| 580 | "dropping packets(s). Dropped: %d\n", |
| 581 | queue->queue_total, queue->queue_dropped); |
| 582 | goto err_out_free_nskb; |
| 583 | } |
| 584 | |
| 585 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ |
| 586 | status = nfnetlink_unicast(nskb, queue->peer_pid, MSG_DONTWAIT); |
| 587 | if (status < 0) { |
| 588 | queue->queue_user_dropped++; |
| 589 | goto err_out_unlock; |
| 590 | } |
| 591 | |
| 592 | __enqueue_entry(queue, entry); |
| 593 | |
| 594 | spin_unlock_bh(&queue->lock); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 595 | instance_put(queue); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 596 | return status; |
| 597 | |
| 598 | err_out_free_nskb: |
| 599 | kfree_skb(nskb); |
| 600 | |
| 601 | err_out_unlock: |
| 602 | spin_unlock_bh(&queue->lock); |
| 603 | |
| 604 | err_out_free: |
| 605 | kfree(entry); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 606 | err_out_put: |
| 607 | instance_put(queue); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 608 | return status; |
| 609 | } |
| 610 | |
| 611 | static int |
| 612 | nfqnl_mangle(void *data, int data_len, struct nfqnl_queue_entry *e) |
| 613 | { |
| 614 | int diff; |
| 615 | |
| 616 | diff = data_len - e->skb->len; |
| 617 | if (diff < 0) |
| 618 | skb_trim(e->skb, data_len); |
| 619 | else if (diff > 0) { |
| 620 | if (data_len > 0xFFFF) |
| 621 | return -EINVAL; |
| 622 | if (diff > skb_tailroom(e->skb)) { |
| 623 | struct sk_buff *newskb; |
| 624 | |
| 625 | newskb = skb_copy_expand(e->skb, |
| 626 | skb_headroom(e->skb), |
| 627 | diff, |
| 628 | GFP_ATOMIC); |
| 629 | if (newskb == NULL) { |
| 630 | printk(KERN_WARNING "ip_queue: OOM " |
| 631 | "in mangle, dropping packet\n"); |
| 632 | return -ENOMEM; |
| 633 | } |
| 634 | if (e->skb->sk) |
| 635 | skb_set_owner_w(newskb, e->skb->sk); |
| 636 | kfree_skb(e->skb); |
| 637 | e->skb = newskb; |
| 638 | } |
| 639 | skb_put(e->skb, diff); |
| 640 | } |
| 641 | if (!skb_make_writable(&e->skb, data_len)) |
| 642 | return -ENOMEM; |
| 643 | memcpy(e->skb->data, data, data_len); |
Patrick McHardy | e7dfb09 | 2005-09-06 15:10:00 -0700 | [diff] [blame] | 644 | e->skb->ip_summed = CHECKSUM_NONE; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 645 | return 0; |
| 646 | } |
| 647 | |
| 648 | static inline int |
| 649 | id_cmp(struct nfqnl_queue_entry *e, unsigned long id) |
| 650 | { |
| 651 | return (id == e->id); |
| 652 | } |
| 653 | |
| 654 | static int |
| 655 | nfqnl_set_mode(struct nfqnl_instance *queue, |
| 656 | unsigned char mode, unsigned int range) |
| 657 | { |
| 658 | int status; |
| 659 | |
| 660 | spin_lock_bh(&queue->lock); |
| 661 | status = __nfqnl_set_mode(queue, mode, range); |
| 662 | spin_unlock_bh(&queue->lock); |
| 663 | |
| 664 | return status; |
| 665 | } |
| 666 | |
| 667 | static int |
| 668 | dev_cmp(struct nfqnl_queue_entry *entry, unsigned long ifindex) |
| 669 | { |
| 670 | if (entry->info->indev) |
| 671 | if (entry->info->indev->ifindex == ifindex) |
| 672 | return 1; |
| 673 | |
| 674 | if (entry->info->outdev) |
| 675 | if (entry->info->outdev->ifindex == ifindex) |
| 676 | return 1; |
| 677 | |
| 678 | return 0; |
| 679 | } |
| 680 | |
| 681 | /* drop all packets with either indev or outdev == ifindex from all queue |
| 682 | * instances */ |
| 683 | static void |
| 684 | nfqnl_dev_drop(int ifindex) |
| 685 | { |
| 686 | int i; |
| 687 | |
| 688 | QDEBUG("entering for ifindex %u\n", ifindex); |
| 689 | |
| 690 | /* this only looks like we have to hold the readlock for a way too long |
| 691 | * time, issue_verdict(), nf_reinject(), ... - but we always only |
| 692 | * issue NF_DROP, which is processed directly in nf_reinject() */ |
| 693 | read_lock_bh(&instances_lock); |
| 694 | |
| 695 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
| 696 | struct hlist_node *tmp; |
| 697 | struct nfqnl_instance *inst; |
| 698 | struct hlist_head *head = &instance_table[i]; |
| 699 | |
| 700 | hlist_for_each_entry(inst, tmp, head, hlist) { |
| 701 | struct nfqnl_queue_entry *entry; |
| 702 | while ((entry = find_dequeue_entry(inst, dev_cmp, |
| 703 | ifindex)) != NULL) |
| 704 | issue_verdict(entry, NF_DROP); |
| 705 | } |
| 706 | } |
| 707 | |
| 708 | read_unlock_bh(&instances_lock); |
| 709 | } |
| 710 | |
| 711 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) |
| 712 | |
| 713 | static int |
| 714 | nfqnl_rcv_dev_event(struct notifier_block *this, |
| 715 | unsigned long event, void *ptr) |
| 716 | { |
| 717 | struct net_device *dev = ptr; |
| 718 | |
| 719 | /* Drop any packets associated with the downed device */ |
| 720 | if (event == NETDEV_DOWN) |
| 721 | nfqnl_dev_drop(dev->ifindex); |
| 722 | return NOTIFY_DONE; |
| 723 | } |
| 724 | |
| 725 | static struct notifier_block nfqnl_dev_notifier = { |
| 726 | .notifier_call = nfqnl_rcv_dev_event, |
| 727 | }; |
| 728 | |
| 729 | static int |
| 730 | nfqnl_rcv_nl_event(struct notifier_block *this, |
| 731 | unsigned long event, void *ptr) |
| 732 | { |
| 733 | struct netlink_notify *n = ptr; |
| 734 | |
| 735 | if (event == NETLINK_URELEASE && |
| 736 | n->protocol == NETLINK_NETFILTER && n->pid) { |
| 737 | int i; |
| 738 | |
| 739 | /* destroy all instances for this pid */ |
| 740 | write_lock_bh(&instances_lock); |
| 741 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
| 742 | struct hlist_node *tmp, *t2; |
| 743 | struct nfqnl_instance *inst; |
| 744 | struct hlist_head *head = &instance_table[i]; |
| 745 | |
| 746 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { |
| 747 | if (n->pid == inst->peer_pid) |
| 748 | __instance_destroy(inst); |
| 749 | } |
| 750 | } |
| 751 | write_unlock_bh(&instances_lock); |
| 752 | } |
| 753 | return NOTIFY_DONE; |
| 754 | } |
| 755 | |
| 756 | static struct notifier_block nfqnl_rtnl_notifier = { |
| 757 | .notifier_call = nfqnl_rcv_nl_event, |
| 758 | }; |
| 759 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 760 | static const int nfqa_verdict_min[NFQA_MAX] = { |
| 761 | [NFQA_VERDICT_HDR-1] = sizeof(struct nfqnl_msg_verdict_hdr), |
| 762 | [NFQA_MARK-1] = sizeof(u_int32_t), |
| 763 | [NFQA_PAYLOAD-1] = 0, |
| 764 | }; |
| 765 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 766 | static int |
| 767 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, |
| 768 | struct nlmsghdr *nlh, struct nfattr *nfqa[], int *errp) |
| 769 | { |
| 770 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 771 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
| 772 | |
| 773 | struct nfqnl_msg_verdict_hdr *vhdr; |
| 774 | struct nfqnl_instance *queue; |
| 775 | unsigned int verdict; |
| 776 | struct nfqnl_queue_entry *entry; |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 777 | int err; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 778 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 779 | if (nfattr_bad_size(nfqa, NFQA_MAX, nfqa_verdict_min)) { |
| 780 | QDEBUG("bad attribute size\n"); |
| 781 | return -EINVAL; |
| 782 | } |
| 783 | |
| 784 | queue = instance_lookup_get(queue_num); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 785 | if (!queue) |
| 786 | return -ENODEV; |
| 787 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 788 | if (queue->peer_pid != NETLINK_CB(skb).pid) { |
| 789 | err = -EPERM; |
| 790 | goto err_out_put; |
| 791 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 792 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 793 | if (!nfqa[NFQA_VERDICT_HDR-1]) { |
| 794 | err = -EINVAL; |
| 795 | goto err_out_put; |
| 796 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 797 | |
| 798 | vhdr = NFA_DATA(nfqa[NFQA_VERDICT_HDR-1]); |
| 799 | verdict = ntohl(vhdr->verdict); |
| 800 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 801 | if ((verdict & NF_VERDICT_MASK) > NF_MAX_VERDICT) { |
| 802 | err = -EINVAL; |
| 803 | goto err_out_put; |
| 804 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 805 | |
| 806 | entry = find_dequeue_entry(queue, id_cmp, ntohl(vhdr->id)); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 807 | if (entry == NULL) { |
| 808 | err = -ENOENT; |
| 809 | goto err_out_put; |
| 810 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 811 | |
| 812 | if (nfqa[NFQA_PAYLOAD-1]) { |
| 813 | if (nfqnl_mangle(NFA_DATA(nfqa[NFQA_PAYLOAD-1]), |
| 814 | NFA_PAYLOAD(nfqa[NFQA_PAYLOAD-1]), entry) < 0) |
| 815 | verdict = NF_DROP; |
| 816 | } |
| 817 | |
| 818 | if (nfqa[NFQA_MARK-1]) |
| 819 | skb->nfmark = ntohl(*(u_int32_t *)NFA_DATA(nfqa[NFQA_MARK-1])); |
| 820 | |
| 821 | issue_verdict(entry, verdict); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 822 | instance_put(queue); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 823 | return 0; |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 824 | |
| 825 | err_out_put: |
| 826 | instance_put(queue); |
| 827 | return err; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 828 | } |
| 829 | |
| 830 | static int |
| 831 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, |
| 832 | struct nlmsghdr *nlh, struct nfattr *nfqa[], int *errp) |
| 833 | { |
| 834 | return -ENOTSUPP; |
| 835 | } |
| 836 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 837 | static const int nfqa_cfg_min[NFQA_CFG_MAX] = { |
| 838 | [NFQA_CFG_CMD-1] = sizeof(struct nfqnl_msg_config_cmd), |
| 839 | [NFQA_CFG_PARAMS-1] = sizeof(struct nfqnl_msg_config_params), |
| 840 | }; |
| 841 | |
Harald Welte | bbd86b9f | 2005-08-09 20:23:11 -0700 | [diff] [blame] | 842 | static struct nf_queue_handler nfqh = { |
| 843 | .name = "nf_queue", |
| 844 | .outfn = &nfqnl_enqueue_packet, |
| 845 | }; |
| 846 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 847 | static int |
| 848 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, |
| 849 | struct nlmsghdr *nlh, struct nfattr *nfqa[], int *errp) |
| 850 | { |
| 851 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 852 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
| 853 | struct nfqnl_instance *queue; |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 854 | int ret = 0; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 855 | |
| 856 | QDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type)); |
| 857 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 858 | if (nfattr_bad_size(nfqa, NFQA_CFG_MAX, nfqa_cfg_min)) { |
| 859 | QDEBUG("bad attribute size\n"); |
| 860 | return -EINVAL; |
| 861 | } |
| 862 | |
| 863 | queue = instance_lookup_get(queue_num); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 864 | if (nfqa[NFQA_CFG_CMD-1]) { |
| 865 | struct nfqnl_msg_config_cmd *cmd; |
| 866 | cmd = NFA_DATA(nfqa[NFQA_CFG_CMD-1]); |
| 867 | QDEBUG("found CFG_CMD\n"); |
| 868 | |
| 869 | switch (cmd->command) { |
| 870 | case NFQNL_CFG_CMD_BIND: |
| 871 | if (queue) |
| 872 | return -EBUSY; |
| 873 | |
| 874 | queue = instance_create(queue_num, NETLINK_CB(skb).pid); |
| 875 | if (!queue) |
| 876 | return -EINVAL; |
| 877 | break; |
| 878 | case NFQNL_CFG_CMD_UNBIND: |
| 879 | if (!queue) |
| 880 | return -ENODEV; |
| 881 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 882 | if (queue->peer_pid != NETLINK_CB(skb).pid) { |
| 883 | ret = -EPERM; |
| 884 | goto out_put; |
| 885 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 886 | |
| 887 | instance_destroy(queue); |
| 888 | break; |
| 889 | case NFQNL_CFG_CMD_PF_BIND: |
| 890 | QDEBUG("registering queue handler for pf=%u\n", |
| 891 | ntohs(cmd->pf)); |
Harald Welte | bbd86b9f | 2005-08-09 20:23:11 -0700 | [diff] [blame] | 892 | ret = nf_register_queue_handler(ntohs(cmd->pf), &nfqh); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 893 | break; |
| 894 | case NFQNL_CFG_CMD_PF_UNBIND: |
| 895 | QDEBUG("unregistering queue handler for pf=%u\n", |
| 896 | ntohs(cmd->pf)); |
| 897 | /* This is a bug and a feature. We can unregister |
| 898 | * other handlers(!) */ |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 899 | ret = nf_unregister_queue_handler(ntohs(cmd->pf)); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 900 | break; |
| 901 | default: |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 902 | ret = -EINVAL; |
| 903 | break; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 904 | } |
| 905 | } else { |
| 906 | if (!queue) { |
| 907 | QDEBUG("no config command, and no instance ENOENT\n"); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 908 | ret = -ENOENT; |
| 909 | goto out_put; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 910 | } |
| 911 | |
| 912 | if (queue->peer_pid != NETLINK_CB(skb).pid) { |
| 913 | QDEBUG("no config command, and wrong pid\n"); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 914 | ret = -EPERM; |
| 915 | goto out_put; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 916 | } |
| 917 | } |
| 918 | |
| 919 | if (nfqa[NFQA_CFG_PARAMS-1]) { |
| 920 | struct nfqnl_msg_config_params *params; |
| 921 | params = NFA_DATA(nfqa[NFQA_CFG_PARAMS-1]); |
| 922 | |
| 923 | nfqnl_set_mode(queue, params->copy_mode, |
| 924 | ntohl(params->copy_range)); |
| 925 | } |
| 926 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 927 | out_put: |
| 928 | instance_put(queue); |
| 929 | return ret; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 930 | } |
| 931 | |
| 932 | static struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
| 933 | [NFQNL_MSG_PACKET] = { .call = nfqnl_recv_unsupp, |
Harald Welte | 927ccbc | 2005-08-09 20:03:40 -0700 | [diff] [blame] | 934 | .attr_count = NFQA_MAX, |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 935 | .cap_required = CAP_NET_ADMIN }, |
| 936 | [NFQNL_MSG_VERDICT] = { .call = nfqnl_recv_verdict, |
Harald Welte | 927ccbc | 2005-08-09 20:03:40 -0700 | [diff] [blame] | 937 | .attr_count = NFQA_MAX, |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 938 | .cap_required = CAP_NET_ADMIN }, |
| 939 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
Harald Welte | 927ccbc | 2005-08-09 20:03:40 -0700 | [diff] [blame] | 940 | .attr_count = NFQA_CFG_MAX, |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 941 | .cap_required = CAP_NET_ADMIN }, |
| 942 | }; |
| 943 | |
| 944 | static struct nfnetlink_subsystem nfqnl_subsys = { |
| 945 | .name = "nf_queue", |
| 946 | .subsys_id = NFNL_SUBSYS_QUEUE, |
| 947 | .cb_count = NFQNL_MSG_MAX, |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 948 | .cb = nfqnl_cb, |
| 949 | }; |
| 950 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 951 | #ifdef CONFIG_PROC_FS |
| 952 | struct iter_state { |
| 953 | unsigned int bucket; |
| 954 | }; |
| 955 | |
| 956 | static struct hlist_node *get_first(struct seq_file *seq) |
| 957 | { |
| 958 | struct iter_state *st = seq->private; |
| 959 | |
| 960 | if (!st) |
| 961 | return NULL; |
| 962 | |
| 963 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
| 964 | if (!hlist_empty(&instance_table[st->bucket])) |
| 965 | return instance_table[st->bucket].first; |
| 966 | } |
| 967 | return NULL; |
| 968 | } |
| 969 | |
| 970 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) |
| 971 | { |
| 972 | struct iter_state *st = seq->private; |
| 973 | |
| 974 | h = h->next; |
| 975 | while (!h) { |
| 976 | if (++st->bucket >= INSTANCE_BUCKETS) |
| 977 | return NULL; |
| 978 | |
| 979 | h = instance_table[st->bucket].first; |
| 980 | } |
| 981 | return h; |
| 982 | } |
| 983 | |
| 984 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) |
| 985 | { |
| 986 | struct hlist_node *head; |
| 987 | head = get_first(seq); |
| 988 | |
| 989 | if (head) |
| 990 | while (pos && (head = get_next(seq, head))) |
| 991 | pos--; |
| 992 | return pos ? NULL : head; |
| 993 | } |
| 994 | |
| 995 | static void *seq_start(struct seq_file *seq, loff_t *pos) |
| 996 | { |
| 997 | read_lock_bh(&instances_lock); |
| 998 | return get_idx(seq, *pos); |
| 999 | } |
| 1000 | |
| 1001 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 1002 | { |
| 1003 | (*pos)++; |
| 1004 | return get_next(s, v); |
| 1005 | } |
| 1006 | |
| 1007 | static void seq_stop(struct seq_file *s, void *v) |
| 1008 | { |
| 1009 | read_unlock_bh(&instances_lock); |
| 1010 | } |
| 1011 | |
| 1012 | static int seq_show(struct seq_file *s, void *v) |
| 1013 | { |
| 1014 | const struct nfqnl_instance *inst = v; |
| 1015 | |
| 1016 | return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", |
| 1017 | inst->queue_num, |
| 1018 | inst->peer_pid, inst->queue_total, |
| 1019 | inst->copy_mode, inst->copy_range, |
| 1020 | inst->queue_dropped, inst->queue_user_dropped, |
| 1021 | atomic_read(&inst->id_sequence), |
| 1022 | atomic_read(&inst->use)); |
| 1023 | } |
| 1024 | |
| 1025 | static struct seq_operations nfqnl_seq_ops = { |
| 1026 | .start = seq_start, |
| 1027 | .next = seq_next, |
| 1028 | .stop = seq_stop, |
| 1029 | .show = seq_show, |
| 1030 | }; |
| 1031 | |
| 1032 | static int nfqnl_open(struct inode *inode, struct file *file) |
| 1033 | { |
| 1034 | struct seq_file *seq; |
| 1035 | struct iter_state *is; |
| 1036 | int ret; |
| 1037 | |
Harald Welte | 10dfdc6 | 2005-11-03 19:20:07 +0100 | [diff] [blame] | 1038 | is = kzalloc(sizeof(*is), GFP_KERNEL); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1039 | if (!is) |
| 1040 | return -ENOMEM; |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1041 | ret = seq_open(file, &nfqnl_seq_ops); |
| 1042 | if (ret < 0) |
| 1043 | goto out_free; |
| 1044 | seq = file->private_data; |
| 1045 | seq->private = is; |
| 1046 | return ret; |
| 1047 | out_free: |
| 1048 | kfree(is); |
| 1049 | return ret; |
| 1050 | } |
| 1051 | |
| 1052 | static struct file_operations nfqnl_file_ops = { |
| 1053 | .owner = THIS_MODULE, |
| 1054 | .open = nfqnl_open, |
| 1055 | .read = seq_read, |
| 1056 | .llseek = seq_lseek, |
| 1057 | .release = seq_release_private, |
| 1058 | }; |
| 1059 | |
| 1060 | #endif /* PROC_FS */ |
| 1061 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1062 | static int |
| 1063 | init_or_cleanup(int init) |
| 1064 | { |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1065 | int i, status = -ENOMEM; |
| 1066 | #ifdef CONFIG_PROC_FS |
| 1067 | struct proc_dir_entry *proc_nfqueue; |
| 1068 | #endif |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1069 | |
| 1070 | if (!init) |
| 1071 | goto cleanup; |
| 1072 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1073 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
| 1074 | INIT_HLIST_HEAD(&instance_table[i]); |
| 1075 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1076 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
| 1077 | status = nfnetlink_subsys_register(&nfqnl_subsys); |
| 1078 | if (status < 0) { |
| 1079 | printk(KERN_ERR "nf_queue: failed to create netlink socket\n"); |
| 1080 | goto cleanup_netlink_notifier; |
| 1081 | } |
| 1082 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1083 | #ifdef CONFIG_PROC_FS |
| 1084 | proc_nfqueue = create_proc_entry("nfnetlink_queue", 0440, |
| 1085 | proc_net_netfilter); |
| 1086 | if (!proc_nfqueue) |
| 1087 | goto cleanup_subsys; |
| 1088 | proc_nfqueue->proc_fops = &nfqnl_file_ops; |
| 1089 | #endif |
| 1090 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1091 | register_netdevice_notifier(&nfqnl_dev_notifier); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1092 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1093 | return status; |
| 1094 | |
| 1095 | cleanup: |
Harald Welte | bbd86b9f | 2005-08-09 20:23:11 -0700 | [diff] [blame] | 1096 | nf_unregister_queue_handlers(&nfqh); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1097 | unregister_netdevice_notifier(&nfqnl_dev_notifier); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1098 | #ifdef CONFIG_PROC_FS |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1099 | remove_proc_entry("nfnetlink_queue", proc_net_netfilter); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1100 | cleanup_subsys: |
| 1101 | #endif |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1102 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1103 | cleanup_netlink_notifier: |
| 1104 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); |
| 1105 | return status; |
| 1106 | } |
| 1107 | |
| 1108 | static int __init init(void) |
| 1109 | { |
| 1110 | |
| 1111 | return init_or_cleanup(1); |
| 1112 | } |
| 1113 | |
| 1114 | static void __exit fini(void) |
| 1115 | { |
| 1116 | init_or_cleanup(0); |
| 1117 | } |
| 1118 | |
| 1119 | MODULE_DESCRIPTION("netfilter packet queue handler"); |
| 1120 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); |
| 1121 | MODULE_LICENSE("GPL"); |
| 1122 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); |
| 1123 | |
| 1124 | module_init(init); |
| 1125 | module_exit(fini); |