Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This is a module which is used for logging packets to userspace via |
| 3 | * nfetlink. |
| 4 | * |
| 5 | * (C) 2005 by Harald Welte <laforge@netfilter.org> |
| 6 | * |
| 7 | * Based on the old ipv4-only ipt_ULOG.c: |
| 8 | * (C) 2000-2004 by Harald Welte <laforge@netfilter.org> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 13 | */ |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/skbuff.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/ip.h> |
| 18 | #include <linux/ipv6.h> |
| 19 | #include <linux/netdevice.h> |
| 20 | #include <linux/netfilter.h> |
| 21 | #include <linux/netlink.h> |
| 22 | #include <linux/netfilter/nfnetlink.h> |
| 23 | #include <linux/netfilter/nfnetlink_log.h> |
| 24 | #include <linux/spinlock.h> |
| 25 | #include <linux/sysctl.h> |
| 26 | #include <linux/proc_fs.h> |
| 27 | #include <linux/security.h> |
| 28 | #include <linux/list.h> |
| 29 | #include <linux/jhash.h> |
| 30 | #include <linux/random.h> |
| 31 | #include <net/sock.h> |
| 32 | |
| 33 | #include <asm/atomic.h> |
| 34 | |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 35 | #ifdef CONFIG_BRIDGE_NETFILTER |
| 36 | #include "../bridge/br_private.h" |
| 37 | #endif |
| 38 | |
Holger Eitzenberger | c2db292 | 2006-02-04 02:13:14 -0800 | [diff] [blame] | 39 | #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 40 | #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */ |
| 41 | #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ |
| 42 | |
| 43 | #define PRINTR(x, args...) do { if (net_ratelimit()) \ |
| 44 | printk(x, ## args); } while (0); |
| 45 | |
| 46 | #if 0 |
| 47 | #define UDEBUG(x, args ...) printk(KERN_DEBUG "%s(%d):%s(): " x, \ |
| 48 | __FILE__, __LINE__, __FUNCTION__, \ |
| 49 | ## args) |
| 50 | #else |
| 51 | #define UDEBUG(x, ...) |
| 52 | #endif |
| 53 | |
| 54 | struct nfulnl_instance { |
| 55 | struct hlist_node hlist; /* global list of instances */ |
| 56 | spinlock_t lock; |
| 57 | atomic_t use; /* use count */ |
| 58 | |
| 59 | unsigned int qlen; /* number of nlmsgs in skb */ |
| 60 | struct sk_buff *skb; /* pre-allocatd skb */ |
| 61 | struct nlmsghdr *lastnlh; /* netlink header of last msg in skb */ |
| 62 | struct timer_list timer; |
| 63 | int peer_pid; /* PID of the peer process */ |
| 64 | |
| 65 | /* configurable parameters */ |
| 66 | unsigned int flushtimeout; /* timeout until queue flush */ |
| 67 | unsigned int nlbufsiz; /* netlink buffer allocation size */ |
| 68 | unsigned int qthreshold; /* threshold of the queue */ |
| 69 | u_int32_t copy_range; |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 70 | u_int32_t seq; /* instance-local sequential counter */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 71 | u_int16_t group_num; /* number of this queue */ |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 72 | u_int16_t flags; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 73 | u_int8_t copy_mode; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 74 | }; |
| 75 | |
| 76 | static DEFINE_RWLOCK(instances_lock); |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 77 | static atomic_t global_seq; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 78 | |
| 79 | #define INSTANCE_BUCKETS 16 |
| 80 | static struct hlist_head instance_table[INSTANCE_BUCKETS]; |
| 81 | static unsigned int hash_init; |
| 82 | |
| 83 | static inline u_int8_t instance_hashfn(u_int16_t group_num) |
| 84 | { |
| 85 | return ((group_num & 0xff) % INSTANCE_BUCKETS); |
| 86 | } |
| 87 | |
| 88 | static struct nfulnl_instance * |
| 89 | __instance_lookup(u_int16_t group_num) |
| 90 | { |
| 91 | struct hlist_head *head; |
| 92 | struct hlist_node *pos; |
| 93 | struct nfulnl_instance *inst; |
| 94 | |
| 95 | UDEBUG("entering (group_num=%u)\n", group_num); |
| 96 | |
| 97 | head = &instance_table[instance_hashfn(group_num)]; |
| 98 | hlist_for_each_entry(inst, pos, head, hlist) { |
| 99 | if (inst->group_num == group_num) |
| 100 | return inst; |
| 101 | } |
| 102 | return NULL; |
| 103 | } |
| 104 | |
| 105 | static inline void |
| 106 | instance_get(struct nfulnl_instance *inst) |
| 107 | { |
| 108 | atomic_inc(&inst->use); |
| 109 | } |
| 110 | |
| 111 | static struct nfulnl_instance * |
| 112 | instance_lookup_get(u_int16_t group_num) |
| 113 | { |
| 114 | struct nfulnl_instance *inst; |
| 115 | |
| 116 | read_lock_bh(&instances_lock); |
| 117 | inst = __instance_lookup(group_num); |
| 118 | if (inst) |
| 119 | instance_get(inst); |
| 120 | read_unlock_bh(&instances_lock); |
| 121 | |
| 122 | return inst; |
| 123 | } |
| 124 | |
| 125 | static void |
| 126 | instance_put(struct nfulnl_instance *inst) |
| 127 | { |
| 128 | if (inst && atomic_dec_and_test(&inst->use)) { |
| 129 | UDEBUG("kfree(inst=%p)\n", inst); |
| 130 | kfree(inst); |
Patrick McHardy | 7d90e86 | 2007-03-04 15:59:45 -0800 | [diff] [blame] | 131 | module_put(THIS_MODULE); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 132 | } |
| 133 | } |
| 134 | |
| 135 | static void nfulnl_timer(unsigned long data); |
| 136 | |
| 137 | static struct nfulnl_instance * |
| 138 | instance_create(u_int16_t group_num, int pid) |
| 139 | { |
| 140 | struct nfulnl_instance *inst; |
| 141 | |
| 142 | UDEBUG("entering (group_num=%u, pid=%d)\n", group_num, |
| 143 | pid); |
| 144 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 145 | write_lock_bh(&instances_lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 146 | if (__instance_lookup(group_num)) { |
| 147 | inst = NULL; |
| 148 | UDEBUG("aborting, instance already exists\n"); |
| 149 | goto out_unlock; |
| 150 | } |
| 151 | |
Harald Welte | 10dfdc6 | 2005-11-03 19:20:07 +0100 | [diff] [blame] | 152 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 153 | if (!inst) |
| 154 | goto out_unlock; |
| 155 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 156 | INIT_HLIST_NODE(&inst->hlist); |
YOSHIFUJI Hideaki | 181a46a | 2006-01-04 13:56:54 -0800 | [diff] [blame] | 157 | spin_lock_init(&inst->lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 158 | /* needs to be two, since we _put() after creation */ |
| 159 | atomic_set(&inst->use, 2); |
| 160 | |
| 161 | init_timer(&inst->timer); |
| 162 | inst->timer.function = nfulnl_timer; |
| 163 | inst->timer.data = (unsigned long)inst; |
| 164 | /* don't start timer yet. (re)start it with every packet */ |
| 165 | |
| 166 | inst->peer_pid = pid; |
| 167 | inst->group_num = group_num; |
| 168 | |
| 169 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; |
| 170 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; |
| 171 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; |
| 172 | inst->copy_mode = NFULNL_COPY_PACKET; |
| 173 | inst->copy_range = 0xffff; |
| 174 | |
| 175 | if (!try_module_get(THIS_MODULE)) |
| 176 | goto out_free; |
| 177 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 178 | hlist_add_head(&inst->hlist, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 179 | &instance_table[instance_hashfn(group_num)]); |
| 180 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 181 | UDEBUG("newly added node: %p, next=%p\n", &inst->hlist, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 182 | inst->hlist.next); |
| 183 | |
| 184 | write_unlock_bh(&instances_lock); |
| 185 | |
| 186 | return inst; |
| 187 | |
| 188 | out_free: |
| 189 | instance_put(inst); |
| 190 | out_unlock: |
| 191 | write_unlock_bh(&instances_lock); |
| 192 | return NULL; |
| 193 | } |
| 194 | |
| 195 | static int __nfulnl_send(struct nfulnl_instance *inst); |
| 196 | |
| 197 | static void |
| 198 | _instance_destroy2(struct nfulnl_instance *inst, int lock) |
| 199 | { |
| 200 | /* first pull it out of the global list */ |
| 201 | if (lock) |
| 202 | write_lock_bh(&instances_lock); |
| 203 | |
| 204 | UDEBUG("removing instance %p (queuenum=%u) from hash\n", |
| 205 | inst, inst->group_num); |
| 206 | |
| 207 | hlist_del(&inst->hlist); |
| 208 | |
| 209 | if (lock) |
| 210 | write_unlock_bh(&instances_lock); |
| 211 | |
| 212 | /* then flush all pending packets from skb */ |
| 213 | |
| 214 | spin_lock_bh(&inst->lock); |
| 215 | if (inst->skb) { |
Michal Miroslaw | b4d6202 | 2007-03-04 16:00:04 -0800 | [diff] [blame] | 216 | /* timer "holds" one reference (we have one more) */ |
| 217 | if (del_timer(&inst->timer)) |
| 218 | instance_put(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 219 | if (inst->qlen) |
| 220 | __nfulnl_send(inst); |
| 221 | if (inst->skb) { |
| 222 | kfree_skb(inst->skb); |
| 223 | inst->skb = NULL; |
| 224 | } |
| 225 | } |
| 226 | spin_unlock_bh(&inst->lock); |
| 227 | |
| 228 | /* and finally put the refcount */ |
| 229 | instance_put(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 230 | } |
| 231 | |
| 232 | static inline void |
| 233 | __instance_destroy(struct nfulnl_instance *inst) |
| 234 | { |
| 235 | _instance_destroy2(inst, 0); |
| 236 | } |
| 237 | |
| 238 | static inline void |
| 239 | instance_destroy(struct nfulnl_instance *inst) |
| 240 | { |
| 241 | _instance_destroy2(inst, 1); |
| 242 | } |
| 243 | |
| 244 | static int |
| 245 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, |
| 246 | unsigned int range) |
| 247 | { |
| 248 | int status = 0; |
| 249 | |
| 250 | spin_lock_bh(&inst->lock); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 251 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 252 | switch (mode) { |
| 253 | case NFULNL_COPY_NONE: |
| 254 | case NFULNL_COPY_META: |
| 255 | inst->copy_mode = mode; |
| 256 | inst->copy_range = 0; |
| 257 | break; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 258 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 259 | case NFULNL_COPY_PACKET: |
| 260 | inst->copy_mode = mode; |
| 261 | /* we're using struct nfattr which has 16bit nfa_len */ |
| 262 | if (range > 0xffff) |
| 263 | inst->copy_range = 0xffff; |
| 264 | else |
| 265 | inst->copy_range = range; |
| 266 | break; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 267 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 268 | default: |
| 269 | status = -EINVAL; |
| 270 | break; |
| 271 | } |
| 272 | |
| 273 | spin_unlock_bh(&inst->lock); |
| 274 | |
| 275 | return status; |
| 276 | } |
| 277 | |
| 278 | static int |
| 279 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) |
| 280 | { |
| 281 | int status; |
| 282 | |
| 283 | spin_lock_bh(&inst->lock); |
| 284 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) |
| 285 | status = -ERANGE; |
| 286 | else if (nlbufsiz > 131072) |
| 287 | status = -ERANGE; |
| 288 | else { |
| 289 | inst->nlbufsiz = nlbufsiz; |
| 290 | status = 0; |
| 291 | } |
| 292 | spin_unlock_bh(&inst->lock); |
| 293 | |
| 294 | return status; |
| 295 | } |
| 296 | |
| 297 | static int |
| 298 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) |
| 299 | { |
| 300 | spin_lock_bh(&inst->lock); |
| 301 | inst->flushtimeout = timeout; |
| 302 | spin_unlock_bh(&inst->lock); |
| 303 | |
| 304 | return 0; |
| 305 | } |
| 306 | |
| 307 | static int |
| 308 | nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) |
| 309 | { |
| 310 | spin_lock_bh(&inst->lock); |
| 311 | inst->qthreshold = qthresh; |
| 312 | spin_unlock_bh(&inst->lock); |
| 313 | |
| 314 | return 0; |
| 315 | } |
| 316 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 317 | static int |
| 318 | nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) |
| 319 | { |
| 320 | spin_lock_bh(&inst->lock); |
Patrick McHardy | ee43353 | 2006-05-19 02:17:18 -0700 | [diff] [blame] | 321 | inst->flags = flags; |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 322 | spin_unlock_bh(&inst->lock); |
| 323 | |
| 324 | return 0; |
| 325 | } |
| 326 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 327 | static struct sk_buff *nfulnl_alloc_skb(unsigned int inst_size, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 328 | unsigned int pkt_size) |
| 329 | { |
| 330 | struct sk_buff *skb; |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 331 | unsigned int n; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 332 | |
| 333 | UDEBUG("entered (%u, %u)\n", inst_size, pkt_size); |
| 334 | |
| 335 | /* alloc skb which should be big enough for a whole multipart |
| 336 | * message. WARNING: has to be <= 128k due to slab restrictions */ |
| 337 | |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 338 | n = max(inst_size, pkt_size); |
| 339 | skb = alloc_skb(n, GFP_ATOMIC); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 340 | if (!skb) { |
| 341 | PRINTR("nfnetlink_log: can't alloc whole buffer (%u bytes)\n", |
| 342 | inst_size); |
| 343 | |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 344 | if (n > pkt_size) { |
| 345 | /* try to allocate only as much as we need for current |
| 346 | * packet */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 347 | |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 348 | skb = alloc_skb(pkt_size, GFP_ATOMIC); |
| 349 | if (!skb) |
| 350 | PRINTR("nfnetlink_log: can't even alloc %u " |
| 351 | "bytes\n", pkt_size); |
| 352 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 353 | } |
| 354 | |
| 355 | return skb; |
| 356 | } |
| 357 | |
| 358 | static int |
| 359 | __nfulnl_send(struct nfulnl_instance *inst) |
| 360 | { |
| 361 | int status; |
| 362 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 363 | if (inst->qlen > 1) |
| 364 | inst->lastnlh->nlmsg_type = NLMSG_DONE; |
| 365 | |
| 366 | status = nfnetlink_unicast(inst->skb, inst->peer_pid, MSG_DONTWAIT); |
| 367 | if (status < 0) { |
| 368 | UDEBUG("netlink_unicast() failed\n"); |
| 369 | /* FIXME: statistics */ |
| 370 | } |
| 371 | |
| 372 | inst->qlen = 0; |
| 373 | inst->skb = NULL; |
| 374 | inst->lastnlh = NULL; |
| 375 | |
| 376 | return status; |
| 377 | } |
| 378 | |
| 379 | static void nfulnl_timer(unsigned long data) |
| 380 | { |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 381 | struct nfulnl_instance *inst = (struct nfulnl_instance *)data; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 382 | |
| 383 | UDEBUG("timer function called, flushing buffer\n"); |
| 384 | |
| 385 | spin_lock_bh(&inst->lock); |
Michal Miroslaw | 370e6a8 | 2007-03-23 11:12:21 -0700 | [diff] [blame^] | 386 | if (inst->skb) |
| 387 | __nfulnl_send(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 388 | spin_unlock_bh(&inst->lock); |
Michal Miroslaw | 05f7b7b | 2007-03-04 15:58:40 -0800 | [diff] [blame] | 389 | instance_put(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 390 | } |
| 391 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 392 | /* This is an inline function, we don't really care about a long |
| 393 | * list of arguments */ |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 394 | static inline int |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 395 | __build_packet_message(struct nfulnl_instance *inst, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 396 | const struct sk_buff *skb, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 397 | unsigned int data_len, |
| 398 | unsigned int pf, |
| 399 | unsigned int hooknum, |
| 400 | const struct net_device *indev, |
| 401 | const struct net_device *outdev, |
| 402 | const struct nf_loginfo *li, |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 403 | const char *prefix, unsigned int plen) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 404 | { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 405 | struct nfulnl_msg_packet_hdr pmsg; |
| 406 | struct nlmsghdr *nlh; |
| 407 | struct nfgenmsg *nfmsg; |
Al Viro | 98a4a86 | 2006-11-08 00:26:51 -0800 | [diff] [blame] | 408 | __be32 tmp_uint; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 409 | sk_buff_data_t old_tail = inst->skb->tail; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 410 | |
| 411 | UDEBUG("entered\n"); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 412 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 413 | nlh = NLMSG_PUT(inst->skb, 0, 0, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 414 | NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, |
| 415 | sizeof(struct nfgenmsg)); |
| 416 | nfmsg = NLMSG_DATA(nlh); |
| 417 | nfmsg->nfgen_family = pf; |
| 418 | nfmsg->version = NFNETLINK_V0; |
| 419 | nfmsg->res_id = htons(inst->group_num); |
| 420 | |
Al Viro | febf0a4 | 2006-11-03 00:59:17 -0800 | [diff] [blame] | 421 | pmsg.hw_protocol = skb->protocol; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 422 | pmsg.hook = hooknum; |
| 423 | |
| 424 | NFA_PUT(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg); |
| 425 | |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 426 | if (prefix) |
| 427 | NFA_PUT(inst->skb, NFULA_PREFIX, plen, prefix); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 428 | |
| 429 | if (indev) { |
| 430 | tmp_uint = htonl(indev->ifindex); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 431 | #ifndef CONFIG_BRIDGE_NETFILTER |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 432 | NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV, sizeof(tmp_uint), |
| 433 | &tmp_uint); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 434 | #else |
| 435 | if (pf == PF_BRIDGE) { |
| 436 | /* Case 1: outdev is physical input device, we need to |
| 437 | * look for bridge group (when called from |
| 438 | * netfilter_bridge) */ |
| 439 | NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
| 440 | sizeof(tmp_uint), &tmp_uint); |
| 441 | /* this is the bridge group "brX" */ |
| 442 | tmp_uint = htonl(indev->br_port->br->dev->ifindex); |
| 443 | NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV, |
| 444 | sizeof(tmp_uint), &tmp_uint); |
| 445 | } else { |
| 446 | /* Case 2: indev is bridge group, we need to look for |
| 447 | * physical device (when called from ipv4) */ |
| 448 | NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV, |
| 449 | sizeof(tmp_uint), &tmp_uint); |
| 450 | if (skb->nf_bridge && skb->nf_bridge->physindev) { |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 451 | tmp_uint = |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 452 | htonl(skb->nf_bridge->physindev->ifindex); |
| 453 | NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
| 454 | sizeof(tmp_uint), &tmp_uint); |
| 455 | } |
| 456 | } |
| 457 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 458 | } |
| 459 | |
| 460 | if (outdev) { |
| 461 | tmp_uint = htonl(outdev->ifindex); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 462 | #ifndef CONFIG_BRIDGE_NETFILTER |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 463 | NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, sizeof(tmp_uint), |
| 464 | &tmp_uint); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 465 | #else |
| 466 | if (pf == PF_BRIDGE) { |
| 467 | /* Case 1: outdev is physical output device, we need to |
| 468 | * look for bridge group (when called from |
| 469 | * netfilter_bridge) */ |
| 470 | NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
| 471 | sizeof(tmp_uint), &tmp_uint); |
| 472 | /* this is the bridge group "brX" */ |
| 473 | tmp_uint = htonl(outdev->br_port->br->dev->ifindex); |
| 474 | NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, |
| 475 | sizeof(tmp_uint), &tmp_uint); |
| 476 | } else { |
| 477 | /* Case 2: indev is a bridge group, we need to look |
| 478 | * for physical device (when called from ipv4) */ |
| 479 | NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, |
| 480 | sizeof(tmp_uint), &tmp_uint); |
Patrick McHardy | ba5dcee | 2007-03-06 20:24:53 -0800 | [diff] [blame] | 481 | if (skb->nf_bridge && skb->nf_bridge->physoutdev) { |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 482 | tmp_uint = |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 483 | htonl(skb->nf_bridge->physoutdev->ifindex); |
| 484 | NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
| 485 | sizeof(tmp_uint), &tmp_uint); |
| 486 | } |
| 487 | } |
| 488 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 489 | } |
| 490 | |
Thomas Graf | 82e91ff | 2006-11-09 15:19:14 -0800 | [diff] [blame] | 491 | if (skb->mark) { |
| 492 | tmp_uint = htonl(skb->mark); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 493 | NFA_PUT(inst->skb, NFULA_MARK, sizeof(tmp_uint), &tmp_uint); |
| 494 | } |
| 495 | |
| 496 | if (indev && skb->dev && skb->dev->hard_header_parse) { |
| 497 | struct nfulnl_msg_packet_hw phw; |
Al Viro | 98a4a86 | 2006-11-08 00:26:51 -0800 | [diff] [blame] | 498 | int len = skb->dev->hard_header_parse((struct sk_buff *)skb, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 499 | phw.hw_addr); |
Al Viro | 98a4a86 | 2006-11-08 00:26:51 -0800 | [diff] [blame] | 500 | phw.hw_addrlen = htons(len); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 501 | NFA_PUT(inst->skb, NFULA_HWADDR, sizeof(phw), &phw); |
| 502 | } |
| 503 | |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 504 | if (skb->tstamp.tv64) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 505 | struct nfulnl_msg_packet_timestamp ts; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 506 | struct timeval tv = ktime_to_timeval(skb->tstamp); |
| 507 | ts.sec = cpu_to_be64(tv.tv_sec); |
| 508 | ts.usec = cpu_to_be64(tv.tv_usec); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 509 | |
| 510 | NFA_PUT(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts); |
| 511 | } |
| 512 | |
| 513 | /* UID */ |
| 514 | if (skb->sk) { |
| 515 | read_lock_bh(&skb->sk->sk_callback_lock); |
| 516 | if (skb->sk->sk_socket && skb->sk->sk_socket->file) { |
Al Viro | 98a4a86 | 2006-11-08 00:26:51 -0800 | [diff] [blame] | 517 | __be32 uid = htonl(skb->sk->sk_socket->file->f_uid); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 518 | /* need to unlock here since NFA_PUT may goto */ |
| 519 | read_unlock_bh(&skb->sk->sk_callback_lock); |
| 520 | NFA_PUT(inst->skb, NFULA_UID, sizeof(uid), &uid); |
| 521 | } else |
| 522 | read_unlock_bh(&skb->sk->sk_callback_lock); |
| 523 | } |
| 524 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 525 | /* local sequence number */ |
| 526 | if (inst->flags & NFULNL_CFG_F_SEQ) { |
| 527 | tmp_uint = htonl(inst->seq++); |
| 528 | NFA_PUT(inst->skb, NFULA_SEQ, sizeof(tmp_uint), &tmp_uint); |
| 529 | } |
| 530 | /* global sequence number */ |
| 531 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) { |
Patrick McHardy | 7fdeaf6 | 2006-11-14 19:47:09 -0800 | [diff] [blame] | 532 | tmp_uint = htonl(atomic_inc_return(&global_seq)); |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 533 | NFA_PUT(inst->skb, NFULA_SEQ_GLOBAL, sizeof(tmp_uint), &tmp_uint); |
| 534 | } |
| 535 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 536 | if (data_len) { |
| 537 | struct nfattr *nfa; |
| 538 | int size = NFA_LENGTH(data_len); |
| 539 | |
| 540 | if (skb_tailroom(inst->skb) < (int)NFA_SPACE(data_len)) { |
| 541 | printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); |
| 542 | goto nlmsg_failure; |
| 543 | } |
| 544 | |
| 545 | nfa = (struct nfattr *)skb_put(inst->skb, NFA_ALIGN(size)); |
| 546 | nfa->nfa_type = NFULA_PAYLOAD; |
| 547 | nfa->nfa_len = size; |
| 548 | |
| 549 | if (skb_copy_bits(skb, 0, NFA_DATA(nfa), data_len)) |
| 550 | BUG(); |
| 551 | } |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 552 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 553 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
Michal Miroslaw | a497097 | 2007-03-04 15:59:01 -0800 | [diff] [blame] | 554 | inst->lastnlh = nlh; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 555 | return 0; |
| 556 | |
| 557 | nlmsg_failure: |
| 558 | UDEBUG("nlmsg_failure\n"); |
| 559 | nfattr_failure: |
| 560 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
| 561 | return -1; |
| 562 | } |
| 563 | |
| 564 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) |
| 565 | |
| 566 | static struct nf_loginfo default_loginfo = { |
| 567 | .type = NF_LOG_TYPE_ULOG, |
| 568 | .u = { |
| 569 | .ulog = { |
| 570 | .copy_len = 0xffff, |
| 571 | .group = 0, |
| 572 | .qthreshold = 1, |
| 573 | }, |
| 574 | }, |
| 575 | }; |
| 576 | |
| 577 | /* log handler for internal netfilter logging api */ |
| 578 | static void |
| 579 | nfulnl_log_packet(unsigned int pf, |
| 580 | unsigned int hooknum, |
| 581 | const struct sk_buff *skb, |
| 582 | const struct net_device *in, |
| 583 | const struct net_device *out, |
| 584 | const struct nf_loginfo *li_user, |
| 585 | const char *prefix) |
| 586 | { |
| 587 | unsigned int size, data_len; |
| 588 | struct nfulnl_instance *inst; |
| 589 | const struct nf_loginfo *li; |
| 590 | unsigned int qthreshold; |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 591 | unsigned int plen; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 592 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 593 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 594 | li = li_user; |
| 595 | else |
| 596 | li = &default_loginfo; |
| 597 | |
| 598 | inst = instance_lookup_get(li->u.ulog.group); |
| 599 | if (!inst) |
| 600 | inst = instance_lookup_get(0); |
| 601 | if (!inst) { |
| 602 | PRINTR("nfnetlink_log: trying to log packet, " |
| 603 | "but no instance for group %u\n", li->u.ulog.group); |
| 604 | return; |
| 605 | } |
| 606 | |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 607 | plen = 0; |
| 608 | if (prefix) |
Patrick McHardy | 881dbfe | 2007-03-06 20:24:35 -0800 | [diff] [blame] | 609 | plen = strlen(prefix) + 1; |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 610 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 611 | /* all macros expand to constant values at compile time */ |
| 612 | /* FIXME: do we want to make the size calculation conditional based on |
| 613 | * what is actually present? way more branches and checks, but more |
| 614 | * memory efficient... */ |
| 615 | size = NLMSG_SPACE(sizeof(struct nfgenmsg)) |
| 616 | + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hdr)) |
| 617 | + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ |
| 618 | + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 619 | #ifdef CONFIG_BRIDGE_NETFILTER |
| 620 | + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ |
| 621 | + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ |
| 622 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 623 | + NFA_SPACE(sizeof(u_int32_t)) /* mark */ |
| 624 | + NFA_SPACE(sizeof(u_int32_t)) /* uid */ |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 625 | + NFA_SPACE(plen) /* prefix */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 626 | + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hw)) |
| 627 | + NFA_SPACE(sizeof(struct nfulnl_msg_packet_timestamp)); |
| 628 | |
| 629 | UDEBUG("initial size=%u\n", size); |
| 630 | |
| 631 | spin_lock_bh(&inst->lock); |
| 632 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 633 | if (inst->flags & NFULNL_CFG_F_SEQ) |
| 634 | size += NFA_SPACE(sizeof(u_int32_t)); |
| 635 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
| 636 | size += NFA_SPACE(sizeof(u_int32_t)); |
| 637 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 638 | qthreshold = inst->qthreshold; |
| 639 | /* per-rule qthreshold overrides per-instance */ |
| 640 | if (qthreshold > li->u.ulog.qthreshold) |
| 641 | qthreshold = li->u.ulog.qthreshold; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 642 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 643 | switch (inst->copy_mode) { |
| 644 | case NFULNL_COPY_META: |
| 645 | case NFULNL_COPY_NONE: |
| 646 | data_len = 0; |
| 647 | break; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 648 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 649 | case NFULNL_COPY_PACKET: |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 650 | if (inst->copy_range == 0 |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 651 | || inst->copy_range > skb->len) |
| 652 | data_len = skb->len; |
| 653 | else |
| 654 | data_len = inst->copy_range; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 655 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 656 | size += NFA_SPACE(data_len); |
| 657 | UDEBUG("copy_packet, therefore size now %u\n", size); |
| 658 | break; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 659 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 660 | default: |
Michal Miroslaw | 55b5a91 | 2007-03-23 11:11:05 -0700 | [diff] [blame] | 661 | goto unlock_and_release; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 662 | } |
| 663 | |
Michal Miroslaw | 55b5a91 | 2007-03-23 11:11:05 -0700 | [diff] [blame] | 664 | if (inst->qlen >= qthreshold || |
| 665 | (inst->skb && size > skb_tailroom(inst->skb))) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 666 | /* either the queue len is too high or we don't have |
| 667 | * enough room in the skb left. flush to userspace. */ |
| 668 | UDEBUG("flushing old skb\n"); |
| 669 | |
Michal Miroslaw | b4d6202 | 2007-03-04 16:00:04 -0800 | [diff] [blame] | 670 | /* timer "holds" one reference (we have another one) */ |
| 671 | if (del_timer(&inst->timer)) |
| 672 | instance_put(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 673 | __nfulnl_send(inst); |
Michal Miroslaw | 55b5a91 | 2007-03-23 11:11:05 -0700 | [diff] [blame] | 674 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 675 | |
Michal Miroslaw | 55b5a91 | 2007-03-23 11:11:05 -0700 | [diff] [blame] | 676 | if (!inst->skb) { |
| 677 | inst->skb = nfulnl_alloc_skb(inst->nlbufsiz, size); |
| 678 | if (!inst->skb) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 679 | goto alloc_failure; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 680 | } |
| 681 | |
| 682 | UDEBUG("qlen %d, qthreshold %d\n", inst->qlen, qthreshold); |
| 683 | inst->qlen++; |
| 684 | |
| 685 | __build_packet_message(inst, skb, data_len, pf, |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 686 | hooknum, in, out, li, prefix, plen); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 687 | |
| 688 | /* timer_pending always called within inst->lock, so there |
| 689 | * is no chance of a race here */ |
| 690 | if (!timer_pending(&inst->timer)) { |
| 691 | instance_get(inst); |
| 692 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); |
| 693 | add_timer(&inst->timer); |
| 694 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 695 | |
Michal Miroslaw | ed32abe | 2007-03-04 15:58:15 -0800 | [diff] [blame] | 696 | unlock_and_release: |
| 697 | spin_unlock_bh(&inst->lock); |
| 698 | instance_put(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 699 | return; |
| 700 | |
| 701 | alloc_failure: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 702 | UDEBUG("error allocating skb\n"); |
| 703 | /* FIXME: statistics */ |
Michal Miroslaw | ed32abe | 2007-03-04 15:58:15 -0800 | [diff] [blame] | 704 | goto unlock_and_release; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 705 | } |
| 706 | |
| 707 | static int |
| 708 | nfulnl_rcv_nl_event(struct notifier_block *this, |
| 709 | unsigned long event, void *ptr) |
| 710 | { |
| 711 | struct netlink_notify *n = ptr; |
| 712 | |
| 713 | if (event == NETLINK_URELEASE && |
| 714 | n->protocol == NETLINK_NETFILTER && n->pid) { |
| 715 | int i; |
| 716 | |
| 717 | /* destroy all instances for this pid */ |
| 718 | write_lock_bh(&instances_lock); |
| 719 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
| 720 | struct hlist_node *tmp, *t2; |
| 721 | struct nfulnl_instance *inst; |
| 722 | struct hlist_head *head = &instance_table[i]; |
| 723 | |
| 724 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { |
| 725 | UDEBUG("node = %p\n", inst); |
| 726 | if (n->pid == inst->peer_pid) |
| 727 | __instance_destroy(inst); |
| 728 | } |
| 729 | } |
| 730 | write_unlock_bh(&instances_lock); |
| 731 | } |
| 732 | return NOTIFY_DONE; |
| 733 | } |
| 734 | |
| 735 | static struct notifier_block nfulnl_rtnl_notifier = { |
| 736 | .notifier_call = nfulnl_rcv_nl_event, |
| 737 | }; |
| 738 | |
| 739 | static int |
| 740 | nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, |
Thomas Graf | 1d00a4e | 2007-03-22 23:30:12 -0700 | [diff] [blame] | 741 | struct nlmsghdr *nlh, struct nfattr *nfqa[]) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 742 | { |
| 743 | return -ENOTSUPP; |
| 744 | } |
| 745 | |
| 746 | static struct nf_logger nfulnl_logger = { |
| 747 | .name = "nfnetlink_log", |
| 748 | .logfn = &nfulnl_log_packet, |
| 749 | .me = THIS_MODULE, |
| 750 | }; |
| 751 | |
| 752 | static const int nfula_min[NFULA_MAX] = { |
| 753 | [NFULA_PACKET_HDR-1] = sizeof(struct nfulnl_msg_packet_hdr), |
| 754 | [NFULA_MARK-1] = sizeof(u_int32_t), |
| 755 | [NFULA_TIMESTAMP-1] = sizeof(struct nfulnl_msg_packet_timestamp), |
| 756 | [NFULA_IFINDEX_INDEV-1] = sizeof(u_int32_t), |
| 757 | [NFULA_IFINDEX_OUTDEV-1]= sizeof(u_int32_t), |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 758 | [NFULA_IFINDEX_PHYSINDEV-1] = sizeof(u_int32_t), |
| 759 | [NFULA_IFINDEX_PHYSOUTDEV-1] = sizeof(u_int32_t), |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 760 | [NFULA_HWADDR-1] = sizeof(struct nfulnl_msg_packet_hw), |
| 761 | [NFULA_PAYLOAD-1] = 0, |
| 762 | [NFULA_PREFIX-1] = 0, |
| 763 | [NFULA_UID-1] = sizeof(u_int32_t), |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 764 | [NFULA_SEQ-1] = sizeof(u_int32_t), |
| 765 | [NFULA_SEQ_GLOBAL-1] = sizeof(u_int32_t), |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 766 | }; |
| 767 | |
| 768 | static const int nfula_cfg_min[NFULA_CFG_MAX] = { |
| 769 | [NFULA_CFG_CMD-1] = sizeof(struct nfulnl_msg_config_cmd), |
| 770 | [NFULA_CFG_MODE-1] = sizeof(struct nfulnl_msg_config_mode), |
| 771 | [NFULA_CFG_TIMEOUT-1] = sizeof(u_int32_t), |
| 772 | [NFULA_CFG_QTHRESH-1] = sizeof(u_int32_t), |
| 773 | [NFULA_CFG_NLBUFSIZ-1] = sizeof(u_int32_t), |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 774 | [NFULA_CFG_FLAGS-1] = sizeof(u_int16_t), |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 775 | }; |
| 776 | |
| 777 | static int |
| 778 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, |
Thomas Graf | 1d00a4e | 2007-03-22 23:30:12 -0700 | [diff] [blame] | 779 | struct nlmsghdr *nlh, struct nfattr *nfula[]) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 780 | { |
| 781 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 782 | u_int16_t group_num = ntohs(nfmsg->res_id); |
| 783 | struct nfulnl_instance *inst; |
| 784 | int ret = 0; |
| 785 | |
| 786 | UDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type)); |
| 787 | |
| 788 | if (nfattr_bad_size(nfula, NFULA_CFG_MAX, nfula_cfg_min)) { |
| 789 | UDEBUG("bad attribute size\n"); |
| 790 | return -EINVAL; |
| 791 | } |
| 792 | |
| 793 | inst = instance_lookup_get(group_num); |
| 794 | if (nfula[NFULA_CFG_CMD-1]) { |
| 795 | u_int8_t pf = nfmsg->nfgen_family; |
| 796 | struct nfulnl_msg_config_cmd *cmd; |
| 797 | cmd = NFA_DATA(nfula[NFULA_CFG_CMD-1]); |
| 798 | UDEBUG("found CFG_CMD for\n"); |
| 799 | |
| 800 | switch (cmd->command) { |
| 801 | case NFULNL_CFG_CMD_BIND: |
| 802 | if (inst) { |
| 803 | ret = -EBUSY; |
| 804 | goto out_put; |
| 805 | } |
| 806 | |
| 807 | inst = instance_create(group_num, |
| 808 | NETLINK_CB(skb).pid); |
| 809 | if (!inst) { |
| 810 | ret = -EINVAL; |
Michal Miroslaw | f414c16 | 2007-03-23 11:11:31 -0700 | [diff] [blame] | 811 | goto out; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 812 | } |
| 813 | break; |
| 814 | case NFULNL_CFG_CMD_UNBIND: |
| 815 | if (!inst) { |
| 816 | ret = -ENODEV; |
Michal Miroslaw | f414c16 | 2007-03-23 11:11:31 -0700 | [diff] [blame] | 817 | goto out; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 818 | } |
| 819 | |
| 820 | if (inst->peer_pid != NETLINK_CB(skb).pid) { |
| 821 | ret = -EPERM; |
| 822 | goto out_put; |
| 823 | } |
| 824 | |
| 825 | instance_destroy(inst); |
Michal Miroslaw | 9a36e8c | 2007-03-23 11:11:48 -0700 | [diff] [blame] | 826 | goto out; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 827 | case NFULNL_CFG_CMD_PF_BIND: |
| 828 | UDEBUG("registering log handler for pf=%u\n", pf); |
| 829 | ret = nf_log_register(pf, &nfulnl_logger); |
| 830 | break; |
| 831 | case NFULNL_CFG_CMD_PF_UNBIND: |
| 832 | UDEBUG("unregistering log handler for pf=%u\n", pf); |
| 833 | /* This is a bug and a feature. We cannot unregister |
| 834 | * other handlers, like nfnetlink_inst can */ |
| 835 | nf_log_unregister_pf(pf); |
| 836 | break; |
| 837 | default: |
| 838 | ret = -EINVAL; |
| 839 | break; |
| 840 | } |
Michal Miroslaw | dd16704 | 2007-03-04 15:59:20 -0800 | [diff] [blame] | 841 | |
| 842 | if (!inst) |
| 843 | goto out; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 844 | } else { |
| 845 | if (!inst) { |
| 846 | UDEBUG("no config command, and no instance for " |
| 847 | "group=%u pid=%u =>ENOENT\n", |
| 848 | group_num, NETLINK_CB(skb).pid); |
| 849 | ret = -ENOENT; |
Michal Miroslaw | f414c16 | 2007-03-23 11:11:31 -0700 | [diff] [blame] | 850 | goto out; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 851 | } |
| 852 | |
| 853 | if (inst->peer_pid != NETLINK_CB(skb).pid) { |
| 854 | UDEBUG("no config command, and wrong pid\n"); |
| 855 | ret = -EPERM; |
| 856 | goto out_put; |
| 857 | } |
| 858 | } |
| 859 | |
| 860 | if (nfula[NFULA_CFG_MODE-1]) { |
| 861 | struct nfulnl_msg_config_mode *params; |
| 862 | params = NFA_DATA(nfula[NFULA_CFG_MODE-1]); |
| 863 | |
| 864 | nfulnl_set_mode(inst, params->copy_mode, |
Al Viro | d1208b9 | 2006-11-03 00:58:41 -0800 | [diff] [blame] | 865 | ntohl(params->copy_range)); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 866 | } |
| 867 | |
| 868 | if (nfula[NFULA_CFG_TIMEOUT-1]) { |
Al Viro | 98a4a86 | 2006-11-08 00:26:51 -0800 | [diff] [blame] | 869 | __be32 timeout = |
| 870 | *(__be32 *)NFA_DATA(nfula[NFULA_CFG_TIMEOUT-1]); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 871 | |
| 872 | nfulnl_set_timeout(inst, ntohl(timeout)); |
| 873 | } |
| 874 | |
| 875 | if (nfula[NFULA_CFG_NLBUFSIZ-1]) { |
Al Viro | 98a4a86 | 2006-11-08 00:26:51 -0800 | [diff] [blame] | 876 | __be32 nlbufsiz = |
| 877 | *(__be32 *)NFA_DATA(nfula[NFULA_CFG_NLBUFSIZ-1]); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 878 | |
| 879 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); |
| 880 | } |
| 881 | |
| 882 | if (nfula[NFULA_CFG_QTHRESH-1]) { |
Al Viro | 7ac00a2 | 2006-11-03 00:58:17 -0800 | [diff] [blame] | 883 | __be32 qthresh = |
| 884 | *(__be32 *)NFA_DATA(nfula[NFULA_CFG_QTHRESH-1]); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 885 | |
| 886 | nfulnl_set_qthresh(inst, ntohl(qthresh)); |
| 887 | } |
| 888 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 889 | if (nfula[NFULA_CFG_FLAGS-1]) { |
Al Viro | 98a4a86 | 2006-11-08 00:26:51 -0800 | [diff] [blame] | 890 | __be16 flags = |
| 891 | *(__be16 *)NFA_DATA(nfula[NFULA_CFG_FLAGS-1]); |
Patrick McHardy | ee43353 | 2006-05-19 02:17:18 -0700 | [diff] [blame] | 892 | nfulnl_set_flags(inst, ntohs(flags)); |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 893 | } |
| 894 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 895 | out_put: |
| 896 | instance_put(inst); |
Michal Miroslaw | dd16704 | 2007-03-04 15:59:20 -0800 | [diff] [blame] | 897 | out: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 898 | return ret; |
| 899 | } |
| 900 | |
| 901 | static struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
| 902 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
Harald Welte | 37d2e7a | 2005-11-14 15:24:59 -0800 | [diff] [blame] | 903 | .attr_count = NFULA_MAX, }, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 904 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
Harald Welte | 37d2e7a | 2005-11-14 15:24:59 -0800 | [diff] [blame] | 905 | .attr_count = NFULA_CFG_MAX, }, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 906 | }; |
| 907 | |
| 908 | static struct nfnetlink_subsystem nfulnl_subsys = { |
| 909 | .name = "log", |
| 910 | .subsys_id = NFNL_SUBSYS_ULOG, |
| 911 | .cb_count = NFULNL_MSG_MAX, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 912 | .cb = nfulnl_cb, |
| 913 | }; |
| 914 | |
| 915 | #ifdef CONFIG_PROC_FS |
| 916 | struct iter_state { |
| 917 | unsigned int bucket; |
| 918 | }; |
| 919 | |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 920 | static struct hlist_node *get_first(struct iter_state *st) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 921 | { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 922 | if (!st) |
| 923 | return NULL; |
| 924 | |
| 925 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
| 926 | if (!hlist_empty(&instance_table[st->bucket])) |
| 927 | return instance_table[st->bucket].first; |
| 928 | } |
| 929 | return NULL; |
| 930 | } |
| 931 | |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 932 | static struct hlist_node *get_next(struct iter_state *st, struct hlist_node *h) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 933 | { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 934 | h = h->next; |
| 935 | while (!h) { |
| 936 | if (++st->bucket >= INSTANCE_BUCKETS) |
| 937 | return NULL; |
| 938 | |
| 939 | h = instance_table[st->bucket].first; |
| 940 | } |
| 941 | return h; |
| 942 | } |
| 943 | |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 944 | static struct hlist_node *get_idx(struct iter_state *st, loff_t pos) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 945 | { |
| 946 | struct hlist_node *head; |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 947 | head = get_first(st); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 948 | |
| 949 | if (head) |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 950 | while (pos && (head = get_next(st, head))) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 951 | pos--; |
| 952 | return pos ? NULL : head; |
| 953 | } |
| 954 | |
| 955 | static void *seq_start(struct seq_file *seq, loff_t *pos) |
| 956 | { |
| 957 | read_lock_bh(&instances_lock); |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 958 | return get_idx(seq->private, *pos); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 959 | } |
| 960 | |
| 961 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 962 | { |
| 963 | (*pos)++; |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 964 | return get_next(s->private, v); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 965 | } |
| 966 | |
| 967 | static void seq_stop(struct seq_file *s, void *v) |
| 968 | { |
| 969 | read_unlock_bh(&instances_lock); |
| 970 | } |
| 971 | |
| 972 | static int seq_show(struct seq_file *s, void *v) |
| 973 | { |
| 974 | const struct nfulnl_instance *inst = v; |
| 975 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 976 | return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 977 | inst->group_num, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 978 | inst->peer_pid, inst->qlen, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 979 | inst->copy_mode, inst->copy_range, |
| 980 | inst->flushtimeout, atomic_read(&inst->use)); |
| 981 | } |
| 982 | |
| 983 | static struct seq_operations nful_seq_ops = { |
| 984 | .start = seq_start, |
| 985 | .next = seq_next, |
| 986 | .stop = seq_stop, |
| 987 | .show = seq_show, |
| 988 | }; |
| 989 | |
| 990 | static int nful_open(struct inode *inode, struct file *file) |
| 991 | { |
| 992 | struct seq_file *seq; |
| 993 | struct iter_state *is; |
| 994 | int ret; |
| 995 | |
Harald Welte | 10dfdc6 | 2005-11-03 19:20:07 +0100 | [diff] [blame] | 996 | is = kzalloc(sizeof(*is), GFP_KERNEL); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 997 | if (!is) |
| 998 | return -ENOMEM; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 999 | ret = seq_open(file, &nful_seq_ops); |
| 1000 | if (ret < 0) |
| 1001 | goto out_free; |
| 1002 | seq = file->private_data; |
| 1003 | seq->private = is; |
| 1004 | return ret; |
| 1005 | out_free: |
| 1006 | kfree(is); |
| 1007 | return ret; |
| 1008 | } |
| 1009 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 1010 | static const struct file_operations nful_file_ops = { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1011 | .owner = THIS_MODULE, |
| 1012 | .open = nful_open, |
| 1013 | .read = seq_read, |
| 1014 | .llseek = seq_lseek, |
| 1015 | .release = seq_release_private, |
| 1016 | }; |
| 1017 | |
| 1018 | #endif /* PROC_FS */ |
| 1019 | |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 1020 | static int __init nfnetlink_log_init(void) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1021 | { |
| 1022 | int i, status = -ENOMEM; |
| 1023 | #ifdef CONFIG_PROC_FS |
| 1024 | struct proc_dir_entry *proc_nful; |
| 1025 | #endif |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1026 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1027 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
| 1028 | INIT_HLIST_HEAD(&instance_table[i]); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1029 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1030 | /* it's not really all that important to have a random value, so |
| 1031 | * we can do this from the init function, even if there hasn't |
| 1032 | * been that much entropy yet */ |
| 1033 | get_random_bytes(&hash_init, sizeof(hash_init)); |
| 1034 | |
| 1035 | netlink_register_notifier(&nfulnl_rtnl_notifier); |
| 1036 | status = nfnetlink_subsys_register(&nfulnl_subsys); |
| 1037 | if (status < 0) { |
| 1038 | printk(KERN_ERR "log: failed to create netlink socket\n"); |
| 1039 | goto cleanup_netlink_notifier; |
| 1040 | } |
| 1041 | |
| 1042 | #ifdef CONFIG_PROC_FS |
| 1043 | proc_nful = create_proc_entry("nfnetlink_log", 0440, |
| 1044 | proc_net_netfilter); |
| 1045 | if (!proc_nful) |
| 1046 | goto cleanup_subsys; |
| 1047 | proc_nful->proc_fops = &nful_file_ops; |
| 1048 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1049 | return status; |
| 1050 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1051 | #ifdef CONFIG_PROC_FS |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1052 | cleanup_subsys: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1053 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 1054 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1055 | cleanup_netlink_notifier: |
| 1056 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); |
| 1057 | return status; |
| 1058 | } |
| 1059 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1060 | static void __exit nfnetlink_log_fini(void) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1061 | { |
Patrick McHardy | e92ad99 | 2007-02-12 11:11:55 -0800 | [diff] [blame] | 1062 | nf_log_unregister(&nfulnl_logger); |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 1063 | #ifdef CONFIG_PROC_FS |
| 1064 | remove_proc_entry("nfnetlink_log", proc_net_netfilter); |
| 1065 | #endif |
| 1066 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
| 1067 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1068 | } |
| 1069 | |
| 1070 | MODULE_DESCRIPTION("netfilter userspace logging"); |
| 1071 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); |
| 1072 | MODULE_LICENSE("GPL"); |
Harald Welte | f682fae | 2005-08-09 20:20:34 -0700 | [diff] [blame] | 1073 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1074 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1075 | module_init(nfnetlink_log_init); |
| 1076 | module_exit(nfnetlink_log_fini); |