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); |
YOSHIFUJI Hideaki | 181a46a | 2006-01-04 13:56:54 -0800 | [diff] [blame] | 151 | spin_lock_init(&inst->lock); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 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; |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 348 | struct nf_info *entinf = entry->info; |
| 349 | struct sk_buff *entskb = entry->skb; |
| 350 | struct net_device *indev; |
| 351 | struct net_device *outdev; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 352 | unsigned int tmp_uint; |
| 353 | |
| 354 | QDEBUG("entered\n"); |
| 355 | |
| 356 | /* all macros expand to constant values at compile time */ |
| 357 | size = NLMSG_SPACE(sizeof(struct nfqnl_msg_packet_hdr)) |
| 358 | + NLMSG_SPACE(sizeof(u_int32_t)) /* ifindex */ |
| 359 | + NLMSG_SPACE(sizeof(u_int32_t)) /* ifindex */ |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 360 | #ifdef CONFIG_BRIDGE_NETFILTER |
| 361 | + NLMSG_SPACE(sizeof(u_int32_t)) /* ifindex */ |
| 362 | + NLMSG_SPACE(sizeof(u_int32_t)) /* ifindex */ |
| 363 | #endif |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 364 | + NLMSG_SPACE(sizeof(u_int32_t)) /* mark */ |
| 365 | + NLMSG_SPACE(sizeof(struct nfqnl_msg_packet_hw)) |
| 366 | + NLMSG_SPACE(sizeof(struct nfqnl_msg_packet_timestamp)); |
| 367 | |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 368 | outdev = entinf->outdev; |
| 369 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 370 | spin_lock_bh(&queue->lock); |
| 371 | |
| 372 | switch (queue->copy_mode) { |
| 373 | case NFQNL_COPY_META: |
| 374 | case NFQNL_COPY_NONE: |
| 375 | data_len = 0; |
| 376 | break; |
| 377 | |
| 378 | case NFQNL_COPY_PACKET: |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 379 | if (entskb->ip_summed == CHECKSUM_HW && |
| 380 | (*errp = skb_checksum_help(entskb, |
| 381 | outdev == NULL))) { |
Patrick McHardy | e7dfb09 | 2005-09-06 15:10:00 -0700 | [diff] [blame] | 382 | spin_unlock_bh(&queue->lock); |
| 383 | return NULL; |
| 384 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 385 | if (queue->copy_range == 0 |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 386 | || queue->copy_range > entskb->len) |
| 387 | data_len = entskb->len; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 388 | else |
| 389 | data_len = queue->copy_range; |
| 390 | |
| 391 | size += NLMSG_SPACE(data_len); |
| 392 | break; |
| 393 | |
| 394 | default: |
| 395 | *errp = -EINVAL; |
| 396 | spin_unlock_bh(&queue->lock); |
| 397 | return NULL; |
| 398 | } |
| 399 | |
| 400 | spin_unlock_bh(&queue->lock); |
| 401 | |
| 402 | skb = alloc_skb(size, GFP_ATOMIC); |
| 403 | if (!skb) |
| 404 | goto nlmsg_failure; |
| 405 | |
| 406 | old_tail= skb->tail; |
| 407 | nlh = NLMSG_PUT(skb, 0, 0, |
| 408 | NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, |
| 409 | sizeof(struct nfgenmsg)); |
| 410 | nfmsg = NLMSG_DATA(nlh); |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 411 | nfmsg->nfgen_family = entinf->pf; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 412 | nfmsg->version = NFNETLINK_V0; |
| 413 | nfmsg->res_id = htons(queue->queue_num); |
| 414 | |
| 415 | pmsg.packet_id = htonl(entry->id); |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 416 | pmsg.hw_protocol = htons(entskb->protocol); |
| 417 | pmsg.hook = entinf->hook; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 418 | |
| 419 | NFA_PUT(skb, NFQA_PACKET_HDR, sizeof(pmsg), &pmsg); |
| 420 | |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 421 | indev = entinf->indev; |
| 422 | if (indev) { |
| 423 | tmp_uint = htonl(indev->ifindex); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 424 | #ifndef CONFIG_BRIDGE_NETFILTER |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 425 | NFA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), &tmp_uint); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 426 | #else |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 427 | if (entinf->pf == PF_BRIDGE) { |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 428 | /* Case 1: indev is physical input device, we need to |
| 429 | * look for bridge group (when called from |
| 430 | * netfilter_bridge) */ |
| 431 | NFA_PUT(skb, NFQA_IFINDEX_PHYSINDEV, sizeof(tmp_uint), |
| 432 | &tmp_uint); |
| 433 | /* this is the bridge group "brX" */ |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 434 | tmp_uint = htonl(indev->br_port->br->dev->ifindex); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 435 | NFA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), |
| 436 | &tmp_uint); |
| 437 | } else { |
| 438 | /* Case 2: indev is bridge group, we need to look for |
| 439 | * physical device (when called from ipv4) */ |
| 440 | NFA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), |
| 441 | &tmp_uint); |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 442 | if (entskb->nf_bridge |
| 443 | && entskb->nf_bridge->physindev) { |
| 444 | tmp_uint = htonl(entskb->nf_bridge->physindev->ifindex); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 445 | NFA_PUT(skb, NFQA_IFINDEX_PHYSINDEV, |
| 446 | sizeof(tmp_uint), &tmp_uint); |
| 447 | } |
| 448 | } |
| 449 | #endif |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 450 | } |
| 451 | |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 452 | if (outdev) { |
| 453 | tmp_uint = htonl(outdev->ifindex); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 454 | #ifndef CONFIG_BRIDGE_NETFILTER |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 455 | NFA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), &tmp_uint); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 456 | #else |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 457 | if (entinf->pf == PF_BRIDGE) { |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 458 | /* Case 1: outdev is physical output device, we need to |
| 459 | * look for bridge group (when called from |
| 460 | * netfilter_bridge) */ |
| 461 | NFA_PUT(skb, NFQA_IFINDEX_PHYSOUTDEV, sizeof(tmp_uint), |
| 462 | &tmp_uint); |
| 463 | /* this is the bridge group "brX" */ |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 464 | tmp_uint = htonl(outdev->br_port->br->dev->ifindex); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 465 | NFA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), |
| 466 | &tmp_uint); |
| 467 | } else { |
| 468 | /* Case 2: outdev is bridge group, we need to look for |
| 469 | * physical output device (when called from ipv4) */ |
| 470 | NFA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), |
| 471 | &tmp_uint); |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 472 | if (entskb->nf_bridge |
| 473 | && entskb->nf_bridge->physoutdev) { |
| 474 | tmp_uint = htonl(entskb->nf_bridge->physoutdev->ifindex); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 475 | NFA_PUT(skb, NFQA_IFINDEX_PHYSOUTDEV, |
| 476 | sizeof(tmp_uint), &tmp_uint); |
| 477 | } |
| 478 | } |
| 479 | #endif |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 480 | } |
| 481 | |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 482 | if (entskb->nfmark) { |
| 483 | tmp_uint = htonl(entskb->nfmark); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 484 | NFA_PUT(skb, NFQA_MARK, sizeof(u_int32_t), &tmp_uint); |
| 485 | } |
| 486 | |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 487 | if (indev && entskb->dev |
| 488 | && entskb->dev->hard_header_parse) { |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 489 | struct nfqnl_msg_packet_hw phw; |
| 490 | |
| 491 | phw.hw_addrlen = |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 492 | entskb->dev->hard_header_parse(entskb, |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 493 | phw.hw_addr); |
| 494 | phw.hw_addrlen = htons(phw.hw_addrlen); |
| 495 | NFA_PUT(skb, NFQA_HWADDR, sizeof(phw), &phw); |
| 496 | } |
| 497 | |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 498 | if (entskb->tstamp.off_sec) { |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 499 | struct nfqnl_msg_packet_timestamp ts; |
| 500 | |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 501 | ts.sec = cpu_to_be64(entskb->tstamp.off_sec); |
| 502 | ts.usec = cpu_to_be64(entskb->tstamp.off_usec); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 503 | |
| 504 | NFA_PUT(skb, NFQA_TIMESTAMP, sizeof(ts), &ts); |
| 505 | } |
| 506 | |
| 507 | if (data_len) { |
| 508 | struct nfattr *nfa; |
| 509 | int size = NFA_LENGTH(data_len); |
| 510 | |
| 511 | if (skb_tailroom(skb) < (int)NFA_SPACE(data_len)) { |
| 512 | printk(KERN_WARNING "nf_queue: no tailroom!\n"); |
| 513 | goto nlmsg_failure; |
| 514 | } |
| 515 | |
| 516 | nfa = (struct nfattr *)skb_put(skb, NFA_ALIGN(size)); |
| 517 | nfa->nfa_type = NFQA_PAYLOAD; |
| 518 | nfa->nfa_len = size; |
| 519 | |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 520 | if (skb_copy_bits(entskb, 0, NFA_DATA(nfa), data_len)) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 521 | BUG(); |
| 522 | } |
| 523 | |
| 524 | nlh->nlmsg_len = skb->tail - old_tail; |
| 525 | return skb; |
| 526 | |
| 527 | nlmsg_failure: |
| 528 | nfattr_failure: |
| 529 | if (skb) |
| 530 | kfree_skb(skb); |
| 531 | *errp = -EINVAL; |
| 532 | if (net_ratelimit()) |
| 533 | printk(KERN_ERR "nf_queue: error creating packet message\n"); |
| 534 | return NULL; |
| 535 | } |
| 536 | |
| 537 | static int |
| 538 | nfqnl_enqueue_packet(struct sk_buff *skb, struct nf_info *info, |
| 539 | unsigned int queuenum, void *data) |
| 540 | { |
| 541 | int status = -EINVAL; |
| 542 | struct sk_buff *nskb; |
| 543 | struct nfqnl_instance *queue; |
| 544 | struct nfqnl_queue_entry *entry; |
| 545 | |
| 546 | QDEBUG("entered\n"); |
| 547 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 548 | queue = instance_lookup_get(queuenum); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 549 | if (!queue) { |
| 550 | QDEBUG("no queue instance matching\n"); |
| 551 | return -EINVAL; |
| 552 | } |
| 553 | |
| 554 | if (queue->copy_mode == NFQNL_COPY_NONE) { |
| 555 | QDEBUG("mode COPY_NONE, aborting\n"); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 556 | status = -EAGAIN; |
| 557 | goto err_out_put; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 558 | } |
| 559 | |
| 560 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); |
| 561 | if (entry == NULL) { |
| 562 | if (net_ratelimit()) |
| 563 | printk(KERN_ERR |
| 564 | "nf_queue: OOM in nfqnl_enqueue_packet()\n"); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 565 | status = -ENOMEM; |
| 566 | goto err_out_put; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 567 | } |
| 568 | |
| 569 | entry->info = info; |
| 570 | entry->skb = skb; |
| 571 | entry->id = atomic_inc_return(&queue->id_sequence); |
| 572 | |
| 573 | nskb = nfqnl_build_packet_message(queue, entry, &status); |
| 574 | if (nskb == NULL) |
| 575 | goto err_out_free; |
| 576 | |
| 577 | spin_lock_bh(&queue->lock); |
| 578 | |
| 579 | if (!queue->peer_pid) |
| 580 | goto err_out_free_nskb; |
| 581 | |
| 582 | if (queue->queue_total >= queue->queue_maxlen) { |
| 583 | queue->queue_dropped++; |
| 584 | status = -ENOSPC; |
| 585 | if (net_ratelimit()) |
| 586 | printk(KERN_WARNING "ip_queue: full at %d entries, " |
| 587 | "dropping packets(s). Dropped: %d\n", |
| 588 | queue->queue_total, queue->queue_dropped); |
| 589 | goto err_out_free_nskb; |
| 590 | } |
| 591 | |
| 592 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ |
| 593 | status = nfnetlink_unicast(nskb, queue->peer_pid, MSG_DONTWAIT); |
| 594 | if (status < 0) { |
| 595 | queue->queue_user_dropped++; |
| 596 | goto err_out_unlock; |
| 597 | } |
| 598 | |
| 599 | __enqueue_entry(queue, entry); |
| 600 | |
| 601 | spin_unlock_bh(&queue->lock); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 602 | instance_put(queue); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 603 | return status; |
| 604 | |
| 605 | err_out_free_nskb: |
| 606 | kfree_skb(nskb); |
| 607 | |
| 608 | err_out_unlock: |
| 609 | spin_unlock_bh(&queue->lock); |
| 610 | |
| 611 | err_out_free: |
| 612 | kfree(entry); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 613 | err_out_put: |
| 614 | instance_put(queue); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 615 | return status; |
| 616 | } |
| 617 | |
| 618 | static int |
| 619 | nfqnl_mangle(void *data, int data_len, struct nfqnl_queue_entry *e) |
| 620 | { |
| 621 | int diff; |
| 622 | |
| 623 | diff = data_len - e->skb->len; |
| 624 | if (diff < 0) |
| 625 | skb_trim(e->skb, data_len); |
| 626 | else if (diff > 0) { |
| 627 | if (data_len > 0xFFFF) |
| 628 | return -EINVAL; |
| 629 | if (diff > skb_tailroom(e->skb)) { |
| 630 | struct sk_buff *newskb; |
| 631 | |
| 632 | newskb = skb_copy_expand(e->skb, |
| 633 | skb_headroom(e->skb), |
| 634 | diff, |
| 635 | GFP_ATOMIC); |
| 636 | if (newskb == NULL) { |
| 637 | printk(KERN_WARNING "ip_queue: OOM " |
| 638 | "in mangle, dropping packet\n"); |
| 639 | return -ENOMEM; |
| 640 | } |
| 641 | if (e->skb->sk) |
| 642 | skb_set_owner_w(newskb, e->skb->sk); |
| 643 | kfree_skb(e->skb); |
| 644 | e->skb = newskb; |
| 645 | } |
| 646 | skb_put(e->skb, diff); |
| 647 | } |
| 648 | if (!skb_make_writable(&e->skb, data_len)) |
| 649 | return -ENOMEM; |
| 650 | memcpy(e->skb->data, data, data_len); |
Patrick McHardy | e7dfb09 | 2005-09-06 15:10:00 -0700 | [diff] [blame] | 651 | e->skb->ip_summed = CHECKSUM_NONE; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 652 | return 0; |
| 653 | } |
| 654 | |
| 655 | static inline int |
| 656 | id_cmp(struct nfqnl_queue_entry *e, unsigned long id) |
| 657 | { |
| 658 | return (id == e->id); |
| 659 | } |
| 660 | |
| 661 | static int |
| 662 | nfqnl_set_mode(struct nfqnl_instance *queue, |
| 663 | unsigned char mode, unsigned int range) |
| 664 | { |
| 665 | int status; |
| 666 | |
| 667 | spin_lock_bh(&queue->lock); |
| 668 | status = __nfqnl_set_mode(queue, mode, range); |
| 669 | spin_unlock_bh(&queue->lock); |
| 670 | |
| 671 | return status; |
| 672 | } |
| 673 | |
| 674 | static int |
| 675 | dev_cmp(struct nfqnl_queue_entry *entry, unsigned long ifindex) |
| 676 | { |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 677 | struct nf_info *entinf = entry->info; |
| 678 | |
| 679 | if (entinf->indev) |
| 680 | if (entinf->indev->ifindex == ifindex) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 681 | return 1; |
| 682 | |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 683 | if (entinf->outdev) |
| 684 | if (entinf->outdev->ifindex == ifindex) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 685 | return 1; |
| 686 | |
| 687 | return 0; |
| 688 | } |
| 689 | |
| 690 | /* drop all packets with either indev or outdev == ifindex from all queue |
| 691 | * instances */ |
| 692 | static void |
| 693 | nfqnl_dev_drop(int ifindex) |
| 694 | { |
| 695 | int i; |
| 696 | |
| 697 | QDEBUG("entering for ifindex %u\n", ifindex); |
| 698 | |
| 699 | /* this only looks like we have to hold the readlock for a way too long |
| 700 | * time, issue_verdict(), nf_reinject(), ... - but we always only |
| 701 | * issue NF_DROP, which is processed directly in nf_reinject() */ |
| 702 | read_lock_bh(&instances_lock); |
| 703 | |
| 704 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
| 705 | struct hlist_node *tmp; |
| 706 | struct nfqnl_instance *inst; |
| 707 | struct hlist_head *head = &instance_table[i]; |
| 708 | |
| 709 | hlist_for_each_entry(inst, tmp, head, hlist) { |
| 710 | struct nfqnl_queue_entry *entry; |
| 711 | while ((entry = find_dequeue_entry(inst, dev_cmp, |
| 712 | ifindex)) != NULL) |
| 713 | issue_verdict(entry, NF_DROP); |
| 714 | } |
| 715 | } |
| 716 | |
| 717 | read_unlock_bh(&instances_lock); |
| 718 | } |
| 719 | |
| 720 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) |
| 721 | |
| 722 | static int |
| 723 | nfqnl_rcv_dev_event(struct notifier_block *this, |
| 724 | unsigned long event, void *ptr) |
| 725 | { |
| 726 | struct net_device *dev = ptr; |
| 727 | |
| 728 | /* Drop any packets associated with the downed device */ |
| 729 | if (event == NETDEV_DOWN) |
| 730 | nfqnl_dev_drop(dev->ifindex); |
| 731 | return NOTIFY_DONE; |
| 732 | } |
| 733 | |
| 734 | static struct notifier_block nfqnl_dev_notifier = { |
| 735 | .notifier_call = nfqnl_rcv_dev_event, |
| 736 | }; |
| 737 | |
| 738 | static int |
| 739 | nfqnl_rcv_nl_event(struct notifier_block *this, |
| 740 | unsigned long event, void *ptr) |
| 741 | { |
| 742 | struct netlink_notify *n = ptr; |
| 743 | |
| 744 | if (event == NETLINK_URELEASE && |
| 745 | n->protocol == NETLINK_NETFILTER && n->pid) { |
| 746 | int i; |
| 747 | |
| 748 | /* destroy all instances for this pid */ |
| 749 | write_lock_bh(&instances_lock); |
| 750 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
| 751 | struct hlist_node *tmp, *t2; |
| 752 | struct nfqnl_instance *inst; |
| 753 | struct hlist_head *head = &instance_table[i]; |
| 754 | |
| 755 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { |
| 756 | if (n->pid == inst->peer_pid) |
| 757 | __instance_destroy(inst); |
| 758 | } |
| 759 | } |
| 760 | write_unlock_bh(&instances_lock); |
| 761 | } |
| 762 | return NOTIFY_DONE; |
| 763 | } |
| 764 | |
| 765 | static struct notifier_block nfqnl_rtnl_notifier = { |
| 766 | .notifier_call = nfqnl_rcv_nl_event, |
| 767 | }; |
| 768 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 769 | static const int nfqa_verdict_min[NFQA_MAX] = { |
| 770 | [NFQA_VERDICT_HDR-1] = sizeof(struct nfqnl_msg_verdict_hdr), |
| 771 | [NFQA_MARK-1] = sizeof(u_int32_t), |
| 772 | [NFQA_PAYLOAD-1] = 0, |
| 773 | }; |
| 774 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 775 | static int |
| 776 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, |
| 777 | struct nlmsghdr *nlh, struct nfattr *nfqa[], int *errp) |
| 778 | { |
| 779 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 780 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
| 781 | |
| 782 | struct nfqnl_msg_verdict_hdr *vhdr; |
| 783 | struct nfqnl_instance *queue; |
| 784 | unsigned int verdict; |
| 785 | struct nfqnl_queue_entry *entry; |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 786 | int err; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 787 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 788 | if (nfattr_bad_size(nfqa, NFQA_MAX, nfqa_verdict_min)) { |
| 789 | QDEBUG("bad attribute size\n"); |
| 790 | return -EINVAL; |
| 791 | } |
| 792 | |
| 793 | queue = instance_lookup_get(queue_num); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 794 | if (!queue) |
| 795 | return -ENODEV; |
| 796 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 797 | if (queue->peer_pid != NETLINK_CB(skb).pid) { |
| 798 | err = -EPERM; |
| 799 | goto err_out_put; |
| 800 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 801 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 802 | if (!nfqa[NFQA_VERDICT_HDR-1]) { |
| 803 | err = -EINVAL; |
| 804 | goto err_out_put; |
| 805 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 806 | |
| 807 | vhdr = NFA_DATA(nfqa[NFQA_VERDICT_HDR-1]); |
| 808 | verdict = ntohl(vhdr->verdict); |
| 809 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 810 | if ((verdict & NF_VERDICT_MASK) > NF_MAX_VERDICT) { |
| 811 | err = -EINVAL; |
| 812 | goto err_out_put; |
| 813 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 814 | |
| 815 | entry = find_dequeue_entry(queue, id_cmp, ntohl(vhdr->id)); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 816 | if (entry == NULL) { |
| 817 | err = -ENOENT; |
| 818 | goto err_out_put; |
| 819 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 820 | |
| 821 | if (nfqa[NFQA_PAYLOAD-1]) { |
| 822 | if (nfqnl_mangle(NFA_DATA(nfqa[NFQA_PAYLOAD-1]), |
| 823 | NFA_PAYLOAD(nfqa[NFQA_PAYLOAD-1]), entry) < 0) |
| 824 | verdict = NF_DROP; |
| 825 | } |
| 826 | |
| 827 | if (nfqa[NFQA_MARK-1]) |
Patrick McHardy | a706124 | 2006-02-04 02:14:24 -0800 | [diff] [blame] | 828 | entry->skb->nfmark = ntohl(*(u_int32_t *) |
| 829 | NFA_DATA(nfqa[NFQA_MARK-1])); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 830 | |
| 831 | issue_verdict(entry, verdict); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 832 | instance_put(queue); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 833 | return 0; |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 834 | |
| 835 | err_out_put: |
| 836 | instance_put(queue); |
| 837 | return err; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 838 | } |
| 839 | |
| 840 | static int |
| 841 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, |
| 842 | struct nlmsghdr *nlh, struct nfattr *nfqa[], int *errp) |
| 843 | { |
| 844 | return -ENOTSUPP; |
| 845 | } |
| 846 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 847 | static const int nfqa_cfg_min[NFQA_CFG_MAX] = { |
| 848 | [NFQA_CFG_CMD-1] = sizeof(struct nfqnl_msg_config_cmd), |
| 849 | [NFQA_CFG_PARAMS-1] = sizeof(struct nfqnl_msg_config_params), |
| 850 | }; |
| 851 | |
Harald Welte | bbd86b9f | 2005-08-09 20:23:11 -0700 | [diff] [blame] | 852 | static struct nf_queue_handler nfqh = { |
| 853 | .name = "nf_queue", |
| 854 | .outfn = &nfqnl_enqueue_packet, |
| 855 | }; |
| 856 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 857 | static int |
| 858 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, |
| 859 | struct nlmsghdr *nlh, struct nfattr *nfqa[], int *errp) |
| 860 | { |
| 861 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 862 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
| 863 | struct nfqnl_instance *queue; |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 864 | int ret = 0; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 865 | |
| 866 | QDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type)); |
| 867 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 868 | if (nfattr_bad_size(nfqa, NFQA_CFG_MAX, nfqa_cfg_min)) { |
| 869 | QDEBUG("bad attribute size\n"); |
| 870 | return -EINVAL; |
| 871 | } |
| 872 | |
| 873 | queue = instance_lookup_get(queue_num); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 874 | if (nfqa[NFQA_CFG_CMD-1]) { |
| 875 | struct nfqnl_msg_config_cmd *cmd; |
| 876 | cmd = NFA_DATA(nfqa[NFQA_CFG_CMD-1]); |
| 877 | QDEBUG("found CFG_CMD\n"); |
| 878 | |
| 879 | switch (cmd->command) { |
| 880 | case NFQNL_CFG_CMD_BIND: |
| 881 | if (queue) |
| 882 | return -EBUSY; |
| 883 | |
| 884 | queue = instance_create(queue_num, NETLINK_CB(skb).pid); |
| 885 | if (!queue) |
| 886 | return -EINVAL; |
| 887 | break; |
| 888 | case NFQNL_CFG_CMD_UNBIND: |
| 889 | if (!queue) |
| 890 | return -ENODEV; |
| 891 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 892 | if (queue->peer_pid != NETLINK_CB(skb).pid) { |
| 893 | ret = -EPERM; |
| 894 | goto out_put; |
| 895 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 896 | |
| 897 | instance_destroy(queue); |
| 898 | break; |
| 899 | case NFQNL_CFG_CMD_PF_BIND: |
| 900 | QDEBUG("registering queue handler for pf=%u\n", |
| 901 | ntohs(cmd->pf)); |
Harald Welte | bbd86b9f | 2005-08-09 20:23:11 -0700 | [diff] [blame] | 902 | ret = nf_register_queue_handler(ntohs(cmd->pf), &nfqh); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 903 | break; |
| 904 | case NFQNL_CFG_CMD_PF_UNBIND: |
| 905 | QDEBUG("unregistering queue handler for pf=%u\n", |
| 906 | ntohs(cmd->pf)); |
| 907 | /* This is a bug and a feature. We can unregister |
| 908 | * other handlers(!) */ |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 909 | ret = nf_unregister_queue_handler(ntohs(cmd->pf)); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 910 | break; |
| 911 | default: |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 912 | ret = -EINVAL; |
| 913 | break; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 914 | } |
| 915 | } else { |
| 916 | if (!queue) { |
| 917 | QDEBUG("no config command, and no instance ENOENT\n"); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 918 | ret = -ENOENT; |
| 919 | goto out_put; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 920 | } |
| 921 | |
| 922 | if (queue->peer_pid != NETLINK_CB(skb).pid) { |
| 923 | QDEBUG("no config command, and wrong pid\n"); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 924 | ret = -EPERM; |
| 925 | goto out_put; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 926 | } |
| 927 | } |
| 928 | |
| 929 | if (nfqa[NFQA_CFG_PARAMS-1]) { |
| 930 | struct nfqnl_msg_config_params *params; |
| 931 | params = NFA_DATA(nfqa[NFQA_CFG_PARAMS-1]); |
| 932 | |
| 933 | nfqnl_set_mode(queue, params->copy_mode, |
| 934 | ntohl(params->copy_range)); |
| 935 | } |
| 936 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 937 | out_put: |
| 938 | instance_put(queue); |
| 939 | return ret; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 940 | } |
| 941 | |
| 942 | static struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
| 943 | [NFQNL_MSG_PACKET] = { .call = nfqnl_recv_unsupp, |
Harald Welte | 37d2e7a | 2005-11-14 15:24:59 -0800 | [diff] [blame] | 944 | .attr_count = NFQA_MAX, }, |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 945 | [NFQNL_MSG_VERDICT] = { .call = nfqnl_recv_verdict, |
Harald Welte | 37d2e7a | 2005-11-14 15:24:59 -0800 | [diff] [blame] | 946 | .attr_count = NFQA_MAX, }, |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 947 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
Harald Welte | 37d2e7a | 2005-11-14 15:24:59 -0800 | [diff] [blame] | 948 | .attr_count = NFQA_CFG_MAX, }, |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 949 | }; |
| 950 | |
| 951 | static struct nfnetlink_subsystem nfqnl_subsys = { |
| 952 | .name = "nf_queue", |
| 953 | .subsys_id = NFNL_SUBSYS_QUEUE, |
| 954 | .cb_count = NFQNL_MSG_MAX, |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 955 | .cb = nfqnl_cb, |
| 956 | }; |
| 957 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 958 | #ifdef CONFIG_PROC_FS |
| 959 | struct iter_state { |
| 960 | unsigned int bucket; |
| 961 | }; |
| 962 | |
| 963 | static struct hlist_node *get_first(struct seq_file *seq) |
| 964 | { |
| 965 | struct iter_state *st = seq->private; |
| 966 | |
| 967 | if (!st) |
| 968 | return NULL; |
| 969 | |
| 970 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
| 971 | if (!hlist_empty(&instance_table[st->bucket])) |
| 972 | return instance_table[st->bucket].first; |
| 973 | } |
| 974 | return NULL; |
| 975 | } |
| 976 | |
| 977 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) |
| 978 | { |
| 979 | struct iter_state *st = seq->private; |
| 980 | |
| 981 | h = h->next; |
| 982 | while (!h) { |
| 983 | if (++st->bucket >= INSTANCE_BUCKETS) |
| 984 | return NULL; |
| 985 | |
| 986 | h = instance_table[st->bucket].first; |
| 987 | } |
| 988 | return h; |
| 989 | } |
| 990 | |
| 991 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) |
| 992 | { |
| 993 | struct hlist_node *head; |
| 994 | head = get_first(seq); |
| 995 | |
| 996 | if (head) |
| 997 | while (pos && (head = get_next(seq, head))) |
| 998 | pos--; |
| 999 | return pos ? NULL : head; |
| 1000 | } |
| 1001 | |
| 1002 | static void *seq_start(struct seq_file *seq, loff_t *pos) |
| 1003 | { |
| 1004 | read_lock_bh(&instances_lock); |
| 1005 | return get_idx(seq, *pos); |
| 1006 | } |
| 1007 | |
| 1008 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 1009 | { |
| 1010 | (*pos)++; |
| 1011 | return get_next(s, v); |
| 1012 | } |
| 1013 | |
| 1014 | static void seq_stop(struct seq_file *s, void *v) |
| 1015 | { |
| 1016 | read_unlock_bh(&instances_lock); |
| 1017 | } |
| 1018 | |
| 1019 | static int seq_show(struct seq_file *s, void *v) |
| 1020 | { |
| 1021 | const struct nfqnl_instance *inst = v; |
| 1022 | |
| 1023 | return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", |
| 1024 | inst->queue_num, |
| 1025 | inst->peer_pid, inst->queue_total, |
| 1026 | inst->copy_mode, inst->copy_range, |
| 1027 | inst->queue_dropped, inst->queue_user_dropped, |
| 1028 | atomic_read(&inst->id_sequence), |
| 1029 | atomic_read(&inst->use)); |
| 1030 | } |
| 1031 | |
| 1032 | static struct seq_operations nfqnl_seq_ops = { |
| 1033 | .start = seq_start, |
| 1034 | .next = seq_next, |
| 1035 | .stop = seq_stop, |
| 1036 | .show = seq_show, |
| 1037 | }; |
| 1038 | |
| 1039 | static int nfqnl_open(struct inode *inode, struct file *file) |
| 1040 | { |
| 1041 | struct seq_file *seq; |
| 1042 | struct iter_state *is; |
| 1043 | int ret; |
| 1044 | |
Harald Welte | 10dfdc6 | 2005-11-03 19:20:07 +0100 | [diff] [blame] | 1045 | is = kzalloc(sizeof(*is), GFP_KERNEL); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1046 | if (!is) |
| 1047 | return -ENOMEM; |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1048 | ret = seq_open(file, &nfqnl_seq_ops); |
| 1049 | if (ret < 0) |
| 1050 | goto out_free; |
| 1051 | seq = file->private_data; |
| 1052 | seq->private = is; |
| 1053 | return ret; |
| 1054 | out_free: |
| 1055 | kfree(is); |
| 1056 | return ret; |
| 1057 | } |
| 1058 | |
| 1059 | static struct file_operations nfqnl_file_ops = { |
| 1060 | .owner = THIS_MODULE, |
| 1061 | .open = nfqnl_open, |
| 1062 | .read = seq_read, |
| 1063 | .llseek = seq_lseek, |
| 1064 | .release = seq_release_private, |
| 1065 | }; |
| 1066 | |
| 1067 | #endif /* PROC_FS */ |
| 1068 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1069 | static int |
| 1070 | init_or_cleanup(int init) |
| 1071 | { |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1072 | int i, status = -ENOMEM; |
| 1073 | #ifdef CONFIG_PROC_FS |
| 1074 | struct proc_dir_entry *proc_nfqueue; |
| 1075 | #endif |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1076 | |
| 1077 | if (!init) |
| 1078 | goto cleanup; |
| 1079 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1080 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
| 1081 | INIT_HLIST_HEAD(&instance_table[i]); |
| 1082 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1083 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
| 1084 | status = nfnetlink_subsys_register(&nfqnl_subsys); |
| 1085 | if (status < 0) { |
| 1086 | printk(KERN_ERR "nf_queue: failed to create netlink socket\n"); |
| 1087 | goto cleanup_netlink_notifier; |
| 1088 | } |
| 1089 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1090 | #ifdef CONFIG_PROC_FS |
| 1091 | proc_nfqueue = create_proc_entry("nfnetlink_queue", 0440, |
| 1092 | proc_net_netfilter); |
| 1093 | if (!proc_nfqueue) |
| 1094 | goto cleanup_subsys; |
| 1095 | proc_nfqueue->proc_fops = &nfqnl_file_ops; |
| 1096 | #endif |
| 1097 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1098 | register_netdevice_notifier(&nfqnl_dev_notifier); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1099 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1100 | return status; |
| 1101 | |
| 1102 | cleanup: |
Harald Welte | bbd86b9f | 2005-08-09 20:23:11 -0700 | [diff] [blame] | 1103 | nf_unregister_queue_handlers(&nfqh); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1104 | unregister_netdevice_notifier(&nfqnl_dev_notifier); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1105 | #ifdef CONFIG_PROC_FS |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1106 | remove_proc_entry("nfnetlink_queue", proc_net_netfilter); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1107 | cleanup_subsys: |
| 1108 | #endif |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1109 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1110 | cleanup_netlink_notifier: |
| 1111 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); |
| 1112 | return status; |
| 1113 | } |
| 1114 | |
| 1115 | static int __init init(void) |
| 1116 | { |
| 1117 | |
| 1118 | return init_or_cleanup(1); |
| 1119 | } |
| 1120 | |
| 1121 | static void __exit fini(void) |
| 1122 | { |
| 1123 | init_or_cleanup(0); |
| 1124 | } |
| 1125 | |
| 1126 | MODULE_DESCRIPTION("netfilter packet queue handler"); |
| 1127 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); |
| 1128 | MODULE_LICENSE("GPL"); |
| 1129 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); |
| 1130 | |
| 1131 | module_init(init); |
| 1132 | module_exit(fini); |