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. |
| 13 | * |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 14 | * 2006-01-26 Harald Welte <laforge@netfilter.org> |
| 15 | * - Add optional local and global sequence number to detect lost |
| 16 | * events from userspace |
| 17 | * |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 18 | */ |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/skbuff.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/ip.h> |
| 23 | #include <linux/ipv6.h> |
| 24 | #include <linux/netdevice.h> |
| 25 | #include <linux/netfilter.h> |
| 26 | #include <linux/netlink.h> |
| 27 | #include <linux/netfilter/nfnetlink.h> |
| 28 | #include <linux/netfilter/nfnetlink_log.h> |
| 29 | #include <linux/spinlock.h> |
| 30 | #include <linux/sysctl.h> |
| 31 | #include <linux/proc_fs.h> |
| 32 | #include <linux/security.h> |
| 33 | #include <linux/list.h> |
| 34 | #include <linux/jhash.h> |
| 35 | #include <linux/random.h> |
| 36 | #include <net/sock.h> |
| 37 | |
| 38 | #include <asm/atomic.h> |
| 39 | |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 40 | #ifdef CONFIG_BRIDGE_NETFILTER |
| 41 | #include "../bridge/br_private.h" |
| 42 | #endif |
| 43 | |
Holger Eitzenberger | c2db292 | 2006-02-04 02:13:14 -0800 | [diff] [blame] | 44 | #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 45 | #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */ |
| 46 | #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ |
| 47 | |
| 48 | #define PRINTR(x, args...) do { if (net_ratelimit()) \ |
| 49 | printk(x, ## args); } while (0); |
| 50 | |
| 51 | #if 0 |
| 52 | #define UDEBUG(x, args ...) printk(KERN_DEBUG "%s(%d):%s(): " x, \ |
| 53 | __FILE__, __LINE__, __FUNCTION__, \ |
| 54 | ## args) |
| 55 | #else |
| 56 | #define UDEBUG(x, ...) |
| 57 | #endif |
| 58 | |
| 59 | struct nfulnl_instance { |
| 60 | struct hlist_node hlist; /* global list of instances */ |
| 61 | spinlock_t lock; |
| 62 | atomic_t use; /* use count */ |
| 63 | |
| 64 | unsigned int qlen; /* number of nlmsgs in skb */ |
| 65 | struct sk_buff *skb; /* pre-allocatd skb */ |
| 66 | struct nlmsghdr *lastnlh; /* netlink header of last msg in skb */ |
| 67 | struct timer_list timer; |
| 68 | int peer_pid; /* PID of the peer process */ |
| 69 | |
| 70 | /* configurable parameters */ |
| 71 | unsigned int flushtimeout; /* timeout until queue flush */ |
| 72 | unsigned int nlbufsiz; /* netlink buffer allocation size */ |
| 73 | unsigned int qthreshold; /* threshold of the queue */ |
| 74 | u_int32_t copy_range; |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 75 | u_int32_t seq; /* instance-local sequential counter */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 76 | u_int16_t group_num; /* number of this queue */ |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 77 | u_int16_t flags; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 78 | u_int8_t copy_mode; |
| 79 | }; |
| 80 | |
| 81 | static DEFINE_RWLOCK(instances_lock); |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 82 | static atomic_t global_seq; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 83 | |
| 84 | #define INSTANCE_BUCKETS 16 |
| 85 | static struct hlist_head instance_table[INSTANCE_BUCKETS]; |
| 86 | static unsigned int hash_init; |
| 87 | |
| 88 | static inline u_int8_t instance_hashfn(u_int16_t group_num) |
| 89 | { |
| 90 | return ((group_num & 0xff) % INSTANCE_BUCKETS); |
| 91 | } |
| 92 | |
| 93 | static struct nfulnl_instance * |
| 94 | __instance_lookup(u_int16_t group_num) |
| 95 | { |
| 96 | struct hlist_head *head; |
| 97 | struct hlist_node *pos; |
| 98 | struct nfulnl_instance *inst; |
| 99 | |
| 100 | UDEBUG("entering (group_num=%u)\n", group_num); |
| 101 | |
| 102 | head = &instance_table[instance_hashfn(group_num)]; |
| 103 | hlist_for_each_entry(inst, pos, head, hlist) { |
| 104 | if (inst->group_num == group_num) |
| 105 | return inst; |
| 106 | } |
| 107 | return NULL; |
| 108 | } |
| 109 | |
| 110 | static inline void |
| 111 | instance_get(struct nfulnl_instance *inst) |
| 112 | { |
| 113 | atomic_inc(&inst->use); |
| 114 | } |
| 115 | |
| 116 | static struct nfulnl_instance * |
| 117 | instance_lookup_get(u_int16_t group_num) |
| 118 | { |
| 119 | struct nfulnl_instance *inst; |
| 120 | |
| 121 | read_lock_bh(&instances_lock); |
| 122 | inst = __instance_lookup(group_num); |
| 123 | if (inst) |
| 124 | instance_get(inst); |
| 125 | read_unlock_bh(&instances_lock); |
| 126 | |
| 127 | return inst; |
| 128 | } |
| 129 | |
| 130 | static void |
| 131 | instance_put(struct nfulnl_instance *inst) |
| 132 | { |
| 133 | if (inst && atomic_dec_and_test(&inst->use)) { |
| 134 | UDEBUG("kfree(inst=%p)\n", inst); |
| 135 | kfree(inst); |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | static void nfulnl_timer(unsigned long data); |
| 140 | |
| 141 | static struct nfulnl_instance * |
| 142 | instance_create(u_int16_t group_num, int pid) |
| 143 | { |
| 144 | struct nfulnl_instance *inst; |
| 145 | |
| 146 | UDEBUG("entering (group_num=%u, pid=%d)\n", group_num, |
| 147 | pid); |
| 148 | |
| 149 | write_lock_bh(&instances_lock); |
| 150 | if (__instance_lookup(group_num)) { |
| 151 | inst = NULL; |
| 152 | UDEBUG("aborting, instance already exists\n"); |
| 153 | goto out_unlock; |
| 154 | } |
| 155 | |
Harald Welte | 10dfdc6 | 2005-11-03 19:20:07 +0100 | [diff] [blame] | 156 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 157 | if (!inst) |
| 158 | goto out_unlock; |
| 159 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 160 | INIT_HLIST_NODE(&inst->hlist); |
YOSHIFUJI Hideaki | 181a46a | 2006-01-04 13:56:54 -0800 | [diff] [blame] | 161 | spin_lock_init(&inst->lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 162 | /* needs to be two, since we _put() after creation */ |
| 163 | atomic_set(&inst->use, 2); |
| 164 | |
| 165 | init_timer(&inst->timer); |
| 166 | inst->timer.function = nfulnl_timer; |
| 167 | inst->timer.data = (unsigned long)inst; |
| 168 | /* don't start timer yet. (re)start it with every packet */ |
| 169 | |
| 170 | inst->peer_pid = pid; |
| 171 | inst->group_num = group_num; |
| 172 | |
| 173 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; |
| 174 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; |
| 175 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; |
| 176 | inst->copy_mode = NFULNL_COPY_PACKET; |
| 177 | inst->copy_range = 0xffff; |
| 178 | |
| 179 | if (!try_module_get(THIS_MODULE)) |
| 180 | goto out_free; |
| 181 | |
| 182 | hlist_add_head(&inst->hlist, |
| 183 | &instance_table[instance_hashfn(group_num)]); |
| 184 | |
| 185 | UDEBUG("newly added node: %p, next=%p\n", &inst->hlist, |
| 186 | inst->hlist.next); |
| 187 | |
| 188 | write_unlock_bh(&instances_lock); |
| 189 | |
| 190 | return inst; |
| 191 | |
| 192 | out_free: |
| 193 | instance_put(inst); |
| 194 | out_unlock: |
| 195 | write_unlock_bh(&instances_lock); |
| 196 | return NULL; |
| 197 | } |
| 198 | |
| 199 | static int __nfulnl_send(struct nfulnl_instance *inst); |
| 200 | |
| 201 | static void |
| 202 | _instance_destroy2(struct nfulnl_instance *inst, int lock) |
| 203 | { |
| 204 | /* first pull it out of the global list */ |
| 205 | if (lock) |
| 206 | write_lock_bh(&instances_lock); |
| 207 | |
| 208 | UDEBUG("removing instance %p (queuenum=%u) from hash\n", |
| 209 | inst, inst->group_num); |
| 210 | |
| 211 | hlist_del(&inst->hlist); |
| 212 | |
| 213 | if (lock) |
| 214 | write_unlock_bh(&instances_lock); |
| 215 | |
| 216 | /* then flush all pending packets from skb */ |
| 217 | |
| 218 | spin_lock_bh(&inst->lock); |
| 219 | if (inst->skb) { |
| 220 | if (inst->qlen) |
| 221 | __nfulnl_send(inst); |
| 222 | if (inst->skb) { |
| 223 | kfree_skb(inst->skb); |
| 224 | inst->skb = NULL; |
| 225 | } |
| 226 | } |
| 227 | spin_unlock_bh(&inst->lock); |
| 228 | |
| 229 | /* and finally put the refcount */ |
| 230 | instance_put(inst); |
| 231 | |
| 232 | module_put(THIS_MODULE); |
| 233 | } |
| 234 | |
| 235 | static inline void |
| 236 | __instance_destroy(struct nfulnl_instance *inst) |
| 237 | { |
| 238 | _instance_destroy2(inst, 0); |
| 239 | } |
| 240 | |
| 241 | static inline void |
| 242 | instance_destroy(struct nfulnl_instance *inst) |
| 243 | { |
| 244 | _instance_destroy2(inst, 1); |
| 245 | } |
| 246 | |
| 247 | static int |
| 248 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, |
| 249 | unsigned int range) |
| 250 | { |
| 251 | int status = 0; |
| 252 | |
| 253 | spin_lock_bh(&inst->lock); |
| 254 | |
| 255 | switch (mode) { |
| 256 | case NFULNL_COPY_NONE: |
| 257 | case NFULNL_COPY_META: |
| 258 | inst->copy_mode = mode; |
| 259 | inst->copy_range = 0; |
| 260 | break; |
| 261 | |
| 262 | case NFULNL_COPY_PACKET: |
| 263 | inst->copy_mode = mode; |
| 264 | /* we're using struct nfattr which has 16bit nfa_len */ |
| 265 | if (range > 0xffff) |
| 266 | inst->copy_range = 0xffff; |
| 267 | else |
| 268 | inst->copy_range = range; |
| 269 | break; |
| 270 | |
| 271 | default: |
| 272 | status = -EINVAL; |
| 273 | break; |
| 274 | } |
| 275 | |
| 276 | spin_unlock_bh(&inst->lock); |
| 277 | |
| 278 | return status; |
| 279 | } |
| 280 | |
| 281 | static int |
| 282 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) |
| 283 | { |
| 284 | int status; |
| 285 | |
| 286 | spin_lock_bh(&inst->lock); |
| 287 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) |
| 288 | status = -ERANGE; |
| 289 | else if (nlbufsiz > 131072) |
| 290 | status = -ERANGE; |
| 291 | else { |
| 292 | inst->nlbufsiz = nlbufsiz; |
| 293 | status = 0; |
| 294 | } |
| 295 | spin_unlock_bh(&inst->lock); |
| 296 | |
| 297 | return status; |
| 298 | } |
| 299 | |
| 300 | static int |
| 301 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) |
| 302 | { |
| 303 | spin_lock_bh(&inst->lock); |
| 304 | inst->flushtimeout = timeout; |
| 305 | spin_unlock_bh(&inst->lock); |
| 306 | |
| 307 | return 0; |
| 308 | } |
| 309 | |
| 310 | static int |
| 311 | nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) |
| 312 | { |
| 313 | spin_lock_bh(&inst->lock); |
| 314 | inst->qthreshold = qthresh; |
| 315 | spin_unlock_bh(&inst->lock); |
| 316 | |
| 317 | return 0; |
| 318 | } |
| 319 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 320 | static int |
| 321 | nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) |
| 322 | { |
| 323 | spin_lock_bh(&inst->lock); |
| 324 | inst->flags = ntohs(flags); |
| 325 | spin_unlock_bh(&inst->lock); |
| 326 | |
| 327 | return 0; |
| 328 | } |
| 329 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 330 | static struct sk_buff *nfulnl_alloc_skb(unsigned int inst_size, |
| 331 | unsigned int pkt_size) |
| 332 | { |
| 333 | struct sk_buff *skb; |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 334 | unsigned int n; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 335 | |
| 336 | UDEBUG("entered (%u, %u)\n", inst_size, pkt_size); |
| 337 | |
| 338 | /* alloc skb which should be big enough for a whole multipart |
| 339 | * message. WARNING: has to be <= 128k due to slab restrictions */ |
| 340 | |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 341 | n = max(inst_size, pkt_size); |
| 342 | skb = alloc_skb(n, GFP_ATOMIC); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 343 | if (!skb) { |
| 344 | PRINTR("nfnetlink_log: can't alloc whole buffer (%u bytes)\n", |
| 345 | inst_size); |
| 346 | |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 347 | if (n > pkt_size) { |
| 348 | /* try to allocate only as much as we need for current |
| 349 | * packet */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 350 | |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 351 | skb = alloc_skb(pkt_size, GFP_ATOMIC); |
| 352 | if (!skb) |
| 353 | PRINTR("nfnetlink_log: can't even alloc %u " |
| 354 | "bytes\n", pkt_size); |
| 355 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 356 | } |
| 357 | |
| 358 | return skb; |
| 359 | } |
| 360 | |
| 361 | static int |
| 362 | __nfulnl_send(struct nfulnl_instance *inst) |
| 363 | { |
| 364 | int status; |
| 365 | |
| 366 | if (timer_pending(&inst->timer)) |
| 367 | del_timer(&inst->timer); |
| 368 | |
| 369 | if (inst->qlen > 1) |
| 370 | inst->lastnlh->nlmsg_type = NLMSG_DONE; |
| 371 | |
| 372 | status = nfnetlink_unicast(inst->skb, inst->peer_pid, MSG_DONTWAIT); |
| 373 | if (status < 0) { |
| 374 | UDEBUG("netlink_unicast() failed\n"); |
| 375 | /* FIXME: statistics */ |
| 376 | } |
| 377 | |
| 378 | inst->qlen = 0; |
| 379 | inst->skb = NULL; |
| 380 | inst->lastnlh = NULL; |
| 381 | |
| 382 | return status; |
| 383 | } |
| 384 | |
| 385 | static void nfulnl_timer(unsigned long data) |
| 386 | { |
| 387 | struct nfulnl_instance *inst = (struct nfulnl_instance *)data; |
| 388 | |
| 389 | UDEBUG("timer function called, flushing buffer\n"); |
| 390 | |
| 391 | spin_lock_bh(&inst->lock); |
| 392 | __nfulnl_send(inst); |
| 393 | instance_put(inst); |
| 394 | spin_unlock_bh(&inst->lock); |
| 395 | } |
| 396 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 397 | /* This is an inline function, we don't really care about a long |
| 398 | * list of arguments */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 399 | static inline int |
| 400 | __build_packet_message(struct nfulnl_instance *inst, |
| 401 | const struct sk_buff *skb, |
| 402 | unsigned int data_len, |
| 403 | unsigned int pf, |
| 404 | unsigned int hooknum, |
| 405 | const struct net_device *indev, |
| 406 | const struct net_device *outdev, |
| 407 | const struct nf_loginfo *li, |
| 408 | const char *prefix) |
| 409 | { |
| 410 | unsigned char *old_tail; |
| 411 | struct nfulnl_msg_packet_hdr pmsg; |
| 412 | struct nlmsghdr *nlh; |
| 413 | struct nfgenmsg *nfmsg; |
| 414 | u_int32_t tmp_uint; |
| 415 | |
| 416 | UDEBUG("entered\n"); |
| 417 | |
| 418 | old_tail = inst->skb->tail; |
| 419 | nlh = NLMSG_PUT(inst->skb, 0, 0, |
| 420 | NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, |
| 421 | sizeof(struct nfgenmsg)); |
| 422 | nfmsg = NLMSG_DATA(nlh); |
| 423 | nfmsg->nfgen_family = pf; |
| 424 | nfmsg->version = NFNETLINK_V0; |
| 425 | nfmsg->res_id = htons(inst->group_num); |
| 426 | |
| 427 | pmsg.hw_protocol = htons(skb->protocol); |
| 428 | pmsg.hook = hooknum; |
| 429 | |
| 430 | NFA_PUT(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg); |
| 431 | |
| 432 | if (prefix) { |
| 433 | int slen = strlen(prefix); |
| 434 | if (slen > NFULNL_PREFIXLEN) |
| 435 | slen = NFULNL_PREFIXLEN; |
| 436 | NFA_PUT(inst->skb, NFULA_PREFIX, slen, prefix); |
| 437 | } |
| 438 | |
| 439 | if (indev) { |
| 440 | tmp_uint = htonl(indev->ifindex); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 441 | #ifndef CONFIG_BRIDGE_NETFILTER |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 442 | NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV, sizeof(tmp_uint), |
| 443 | &tmp_uint); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 444 | #else |
| 445 | if (pf == PF_BRIDGE) { |
| 446 | /* Case 1: outdev is physical input device, we need to |
| 447 | * look for bridge group (when called from |
| 448 | * netfilter_bridge) */ |
| 449 | NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
| 450 | sizeof(tmp_uint), &tmp_uint); |
| 451 | /* this is the bridge group "brX" */ |
| 452 | tmp_uint = htonl(indev->br_port->br->dev->ifindex); |
| 453 | NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV, |
| 454 | sizeof(tmp_uint), &tmp_uint); |
| 455 | } else { |
| 456 | /* Case 2: indev is bridge group, we need to look for |
| 457 | * physical device (when called from ipv4) */ |
| 458 | NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV, |
| 459 | sizeof(tmp_uint), &tmp_uint); |
| 460 | if (skb->nf_bridge && skb->nf_bridge->physindev) { |
| 461 | tmp_uint = |
| 462 | htonl(skb->nf_bridge->physindev->ifindex); |
| 463 | NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
| 464 | sizeof(tmp_uint), &tmp_uint); |
| 465 | } |
| 466 | } |
| 467 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 468 | } |
| 469 | |
| 470 | if (outdev) { |
| 471 | tmp_uint = htonl(outdev->ifindex); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 472 | #ifndef CONFIG_BRIDGE_NETFILTER |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 473 | NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, sizeof(tmp_uint), |
| 474 | &tmp_uint); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 475 | #else |
| 476 | if (pf == PF_BRIDGE) { |
| 477 | /* Case 1: outdev is physical output device, we need to |
| 478 | * look for bridge group (when called from |
| 479 | * netfilter_bridge) */ |
| 480 | NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
| 481 | sizeof(tmp_uint), &tmp_uint); |
| 482 | /* this is the bridge group "brX" */ |
| 483 | tmp_uint = htonl(outdev->br_port->br->dev->ifindex); |
| 484 | NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, |
| 485 | sizeof(tmp_uint), &tmp_uint); |
| 486 | } else { |
| 487 | /* Case 2: indev is a bridge group, we need to look |
| 488 | * for physical device (when called from ipv4) */ |
| 489 | NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, |
| 490 | sizeof(tmp_uint), &tmp_uint); |
| 491 | if (skb->nf_bridge) { |
| 492 | tmp_uint = |
| 493 | htonl(skb->nf_bridge->physoutdev->ifindex); |
| 494 | NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
| 495 | sizeof(tmp_uint), &tmp_uint); |
| 496 | } |
| 497 | } |
| 498 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 499 | } |
| 500 | |
| 501 | if (skb->nfmark) { |
| 502 | tmp_uint = htonl(skb->nfmark); |
| 503 | NFA_PUT(inst->skb, NFULA_MARK, sizeof(tmp_uint), &tmp_uint); |
| 504 | } |
| 505 | |
| 506 | if (indev && skb->dev && skb->dev->hard_header_parse) { |
| 507 | struct nfulnl_msg_packet_hw phw; |
| 508 | |
| 509 | phw.hw_addrlen = |
| 510 | skb->dev->hard_header_parse((struct sk_buff *)skb, |
| 511 | phw.hw_addr); |
| 512 | phw.hw_addrlen = htons(phw.hw_addrlen); |
| 513 | NFA_PUT(inst->skb, NFULA_HWADDR, sizeof(phw), &phw); |
| 514 | } |
| 515 | |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 516 | if (skb->tstamp.off_sec) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 517 | struct nfulnl_msg_packet_timestamp ts; |
| 518 | |
Herbert Xu | 325ed82 | 2005-10-03 13:57:23 -0700 | [diff] [blame] | 519 | ts.sec = cpu_to_be64(skb->tstamp.off_sec); |
| 520 | ts.usec = cpu_to_be64(skb->tstamp.off_usec); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 521 | |
| 522 | NFA_PUT(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts); |
| 523 | } |
| 524 | |
| 525 | /* UID */ |
| 526 | if (skb->sk) { |
| 527 | read_lock_bh(&skb->sk->sk_callback_lock); |
| 528 | if (skb->sk->sk_socket && skb->sk->sk_socket->file) { |
| 529 | u_int32_t uid = htonl(skb->sk->sk_socket->file->f_uid); |
| 530 | /* need to unlock here since NFA_PUT may goto */ |
| 531 | read_unlock_bh(&skb->sk->sk_callback_lock); |
| 532 | NFA_PUT(inst->skb, NFULA_UID, sizeof(uid), &uid); |
| 533 | } else |
| 534 | read_unlock_bh(&skb->sk->sk_callback_lock); |
| 535 | } |
| 536 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 537 | /* local sequence number */ |
| 538 | if (inst->flags & NFULNL_CFG_F_SEQ) { |
| 539 | tmp_uint = htonl(inst->seq++); |
| 540 | NFA_PUT(inst->skb, NFULA_SEQ, sizeof(tmp_uint), &tmp_uint); |
| 541 | } |
| 542 | /* global sequence number */ |
| 543 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) { |
| 544 | tmp_uint = atomic_inc_return(&global_seq); |
| 545 | NFA_PUT(inst->skb, NFULA_SEQ_GLOBAL, sizeof(tmp_uint), &tmp_uint); |
| 546 | } |
| 547 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 548 | if (data_len) { |
| 549 | struct nfattr *nfa; |
| 550 | int size = NFA_LENGTH(data_len); |
| 551 | |
| 552 | if (skb_tailroom(inst->skb) < (int)NFA_SPACE(data_len)) { |
| 553 | printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); |
| 554 | goto nlmsg_failure; |
| 555 | } |
| 556 | |
| 557 | nfa = (struct nfattr *)skb_put(inst->skb, NFA_ALIGN(size)); |
| 558 | nfa->nfa_type = NFULA_PAYLOAD; |
| 559 | nfa->nfa_len = size; |
| 560 | |
| 561 | if (skb_copy_bits(skb, 0, NFA_DATA(nfa), data_len)) |
| 562 | BUG(); |
| 563 | } |
| 564 | |
| 565 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
| 566 | return 0; |
| 567 | |
| 568 | nlmsg_failure: |
| 569 | UDEBUG("nlmsg_failure\n"); |
| 570 | nfattr_failure: |
| 571 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
| 572 | return -1; |
| 573 | } |
| 574 | |
| 575 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) |
| 576 | |
| 577 | static struct nf_loginfo default_loginfo = { |
| 578 | .type = NF_LOG_TYPE_ULOG, |
| 579 | .u = { |
| 580 | .ulog = { |
| 581 | .copy_len = 0xffff, |
| 582 | .group = 0, |
| 583 | .qthreshold = 1, |
| 584 | }, |
| 585 | }, |
| 586 | }; |
| 587 | |
| 588 | /* log handler for internal netfilter logging api */ |
| 589 | static void |
| 590 | nfulnl_log_packet(unsigned int pf, |
| 591 | unsigned int hooknum, |
| 592 | const struct sk_buff *skb, |
| 593 | const struct net_device *in, |
| 594 | const struct net_device *out, |
| 595 | const struct nf_loginfo *li_user, |
| 596 | const char *prefix) |
| 597 | { |
| 598 | unsigned int size, data_len; |
| 599 | struct nfulnl_instance *inst; |
| 600 | const struct nf_loginfo *li; |
| 601 | unsigned int qthreshold; |
| 602 | unsigned int nlbufsiz; |
| 603 | |
| 604 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
| 605 | li = li_user; |
| 606 | else |
| 607 | li = &default_loginfo; |
| 608 | |
| 609 | inst = instance_lookup_get(li->u.ulog.group); |
| 610 | if (!inst) |
| 611 | inst = instance_lookup_get(0); |
| 612 | if (!inst) { |
| 613 | PRINTR("nfnetlink_log: trying to log packet, " |
| 614 | "but no instance for group %u\n", li->u.ulog.group); |
| 615 | return; |
| 616 | } |
| 617 | |
| 618 | /* all macros expand to constant values at compile time */ |
| 619 | /* FIXME: do we want to make the size calculation conditional based on |
| 620 | * what is actually present? way more branches and checks, but more |
| 621 | * memory efficient... */ |
| 622 | size = NLMSG_SPACE(sizeof(struct nfgenmsg)) |
| 623 | + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hdr)) |
| 624 | + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ |
| 625 | + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 626 | #ifdef CONFIG_BRIDGE_NETFILTER |
| 627 | + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ |
| 628 | + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ |
| 629 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 630 | + NFA_SPACE(sizeof(u_int32_t)) /* mark */ |
| 631 | + NFA_SPACE(sizeof(u_int32_t)) /* uid */ |
| 632 | + NFA_SPACE(NFULNL_PREFIXLEN) /* prefix */ |
| 633 | + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hw)) |
| 634 | + NFA_SPACE(sizeof(struct nfulnl_msg_packet_timestamp)); |
| 635 | |
| 636 | UDEBUG("initial size=%u\n", size); |
| 637 | |
| 638 | spin_lock_bh(&inst->lock); |
| 639 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 640 | if (inst->flags & NFULNL_CFG_F_SEQ) |
| 641 | size += NFA_SPACE(sizeof(u_int32_t)); |
| 642 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
| 643 | size += NFA_SPACE(sizeof(u_int32_t)); |
| 644 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 645 | qthreshold = inst->qthreshold; |
| 646 | /* per-rule qthreshold overrides per-instance */ |
| 647 | if (qthreshold > li->u.ulog.qthreshold) |
| 648 | qthreshold = li->u.ulog.qthreshold; |
| 649 | |
| 650 | switch (inst->copy_mode) { |
| 651 | case NFULNL_COPY_META: |
| 652 | case NFULNL_COPY_NONE: |
| 653 | data_len = 0; |
| 654 | break; |
| 655 | |
| 656 | case NFULNL_COPY_PACKET: |
| 657 | if (inst->copy_range == 0 |
| 658 | || inst->copy_range > skb->len) |
| 659 | data_len = skb->len; |
| 660 | else |
| 661 | data_len = inst->copy_range; |
| 662 | |
| 663 | size += NFA_SPACE(data_len); |
| 664 | UDEBUG("copy_packet, therefore size now %u\n", size); |
| 665 | break; |
| 666 | |
| 667 | default: |
| 668 | spin_unlock_bh(&inst->lock); |
| 669 | instance_put(inst); |
| 670 | return; |
| 671 | } |
| 672 | |
| 673 | if (size > inst->nlbufsiz) |
| 674 | nlbufsiz = size; |
| 675 | else |
| 676 | nlbufsiz = inst->nlbufsiz; |
| 677 | |
| 678 | if (!inst->skb) { |
| 679 | if (!(inst->skb = nfulnl_alloc_skb(nlbufsiz, size))) { |
| 680 | UDEBUG("error in nfulnl_alloc_skb(%u, %u)\n", |
| 681 | inst->nlbufsiz, size); |
| 682 | goto alloc_failure; |
| 683 | } |
| 684 | } else if (inst->qlen >= qthreshold || |
| 685 | size > skb_tailroom(inst->skb)) { |
| 686 | /* either the queue len is too high or we don't have |
| 687 | * enough room in the skb left. flush to userspace. */ |
| 688 | UDEBUG("flushing old skb\n"); |
| 689 | |
| 690 | __nfulnl_send(inst); |
| 691 | |
| 692 | if (!(inst->skb = nfulnl_alloc_skb(nlbufsiz, size))) { |
| 693 | UDEBUG("error in nfulnl_alloc_skb(%u, %u)\n", |
| 694 | inst->nlbufsiz, size); |
| 695 | goto alloc_failure; |
| 696 | } |
| 697 | } |
| 698 | |
| 699 | UDEBUG("qlen %d, qthreshold %d\n", inst->qlen, qthreshold); |
| 700 | inst->qlen++; |
| 701 | |
| 702 | __build_packet_message(inst, skb, data_len, pf, |
| 703 | hooknum, in, out, li, prefix); |
| 704 | |
| 705 | /* timer_pending always called within inst->lock, so there |
| 706 | * is no chance of a race here */ |
| 707 | if (!timer_pending(&inst->timer)) { |
| 708 | instance_get(inst); |
| 709 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); |
| 710 | add_timer(&inst->timer); |
| 711 | } |
| 712 | spin_unlock_bh(&inst->lock); |
| 713 | |
| 714 | return; |
| 715 | |
| 716 | alloc_failure: |
| 717 | spin_unlock_bh(&inst->lock); |
| 718 | instance_put(inst); |
| 719 | UDEBUG("error allocating skb\n"); |
| 720 | /* FIXME: statistics */ |
| 721 | } |
| 722 | |
| 723 | static int |
| 724 | nfulnl_rcv_nl_event(struct notifier_block *this, |
| 725 | unsigned long event, void *ptr) |
| 726 | { |
| 727 | struct netlink_notify *n = ptr; |
| 728 | |
| 729 | if (event == NETLINK_URELEASE && |
| 730 | n->protocol == NETLINK_NETFILTER && n->pid) { |
| 731 | int i; |
| 732 | |
| 733 | /* destroy all instances for this pid */ |
| 734 | write_lock_bh(&instances_lock); |
| 735 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
| 736 | struct hlist_node *tmp, *t2; |
| 737 | struct nfulnl_instance *inst; |
| 738 | struct hlist_head *head = &instance_table[i]; |
| 739 | |
| 740 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { |
| 741 | UDEBUG("node = %p\n", inst); |
| 742 | if (n->pid == inst->peer_pid) |
| 743 | __instance_destroy(inst); |
| 744 | } |
| 745 | } |
| 746 | write_unlock_bh(&instances_lock); |
| 747 | } |
| 748 | return NOTIFY_DONE; |
| 749 | } |
| 750 | |
| 751 | static struct notifier_block nfulnl_rtnl_notifier = { |
| 752 | .notifier_call = nfulnl_rcv_nl_event, |
| 753 | }; |
| 754 | |
| 755 | static int |
| 756 | nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, |
| 757 | struct nlmsghdr *nlh, struct nfattr *nfqa[], int *errp) |
| 758 | { |
| 759 | return -ENOTSUPP; |
| 760 | } |
| 761 | |
| 762 | static struct nf_logger nfulnl_logger = { |
| 763 | .name = "nfnetlink_log", |
| 764 | .logfn = &nfulnl_log_packet, |
| 765 | .me = THIS_MODULE, |
| 766 | }; |
| 767 | |
| 768 | static const int nfula_min[NFULA_MAX] = { |
| 769 | [NFULA_PACKET_HDR-1] = sizeof(struct nfulnl_msg_packet_hdr), |
| 770 | [NFULA_MARK-1] = sizeof(u_int32_t), |
| 771 | [NFULA_TIMESTAMP-1] = sizeof(struct nfulnl_msg_packet_timestamp), |
| 772 | [NFULA_IFINDEX_INDEV-1] = sizeof(u_int32_t), |
| 773 | [NFULA_IFINDEX_OUTDEV-1]= sizeof(u_int32_t), |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 774 | [NFULA_IFINDEX_PHYSINDEV-1] = sizeof(u_int32_t), |
| 775 | [NFULA_IFINDEX_PHYSOUTDEV-1] = sizeof(u_int32_t), |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 776 | [NFULA_HWADDR-1] = sizeof(struct nfulnl_msg_packet_hw), |
| 777 | [NFULA_PAYLOAD-1] = 0, |
| 778 | [NFULA_PREFIX-1] = 0, |
| 779 | [NFULA_UID-1] = sizeof(u_int32_t), |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 780 | [NFULA_SEQ-1] = sizeof(u_int32_t), |
| 781 | [NFULA_SEQ_GLOBAL-1] = sizeof(u_int32_t), |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 782 | }; |
| 783 | |
| 784 | static const int nfula_cfg_min[NFULA_CFG_MAX] = { |
| 785 | [NFULA_CFG_CMD-1] = sizeof(struct nfulnl_msg_config_cmd), |
| 786 | [NFULA_CFG_MODE-1] = sizeof(struct nfulnl_msg_config_mode), |
| 787 | [NFULA_CFG_TIMEOUT-1] = sizeof(u_int32_t), |
| 788 | [NFULA_CFG_QTHRESH-1] = sizeof(u_int32_t), |
| 789 | [NFULA_CFG_NLBUFSIZ-1] = sizeof(u_int32_t), |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 790 | [NFULA_CFG_FLAGS-1] = sizeof(u_int16_t), |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 791 | }; |
| 792 | |
| 793 | static int |
| 794 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, |
| 795 | struct nlmsghdr *nlh, struct nfattr *nfula[], int *errp) |
| 796 | { |
| 797 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 798 | u_int16_t group_num = ntohs(nfmsg->res_id); |
| 799 | struct nfulnl_instance *inst; |
| 800 | int ret = 0; |
| 801 | |
| 802 | UDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type)); |
| 803 | |
| 804 | if (nfattr_bad_size(nfula, NFULA_CFG_MAX, nfula_cfg_min)) { |
| 805 | UDEBUG("bad attribute size\n"); |
| 806 | return -EINVAL; |
| 807 | } |
| 808 | |
| 809 | inst = instance_lookup_get(group_num); |
| 810 | if (nfula[NFULA_CFG_CMD-1]) { |
| 811 | u_int8_t pf = nfmsg->nfgen_family; |
| 812 | struct nfulnl_msg_config_cmd *cmd; |
| 813 | cmd = NFA_DATA(nfula[NFULA_CFG_CMD-1]); |
| 814 | UDEBUG("found CFG_CMD for\n"); |
| 815 | |
| 816 | switch (cmd->command) { |
| 817 | case NFULNL_CFG_CMD_BIND: |
| 818 | if (inst) { |
| 819 | ret = -EBUSY; |
| 820 | goto out_put; |
| 821 | } |
| 822 | |
| 823 | inst = instance_create(group_num, |
| 824 | NETLINK_CB(skb).pid); |
| 825 | if (!inst) { |
| 826 | ret = -EINVAL; |
| 827 | goto out_put; |
| 828 | } |
| 829 | break; |
| 830 | case NFULNL_CFG_CMD_UNBIND: |
| 831 | if (!inst) { |
| 832 | ret = -ENODEV; |
| 833 | goto out_put; |
| 834 | } |
| 835 | |
| 836 | if (inst->peer_pid != NETLINK_CB(skb).pid) { |
| 837 | ret = -EPERM; |
| 838 | goto out_put; |
| 839 | } |
| 840 | |
| 841 | instance_destroy(inst); |
| 842 | break; |
| 843 | case NFULNL_CFG_CMD_PF_BIND: |
| 844 | UDEBUG("registering log handler for pf=%u\n", pf); |
| 845 | ret = nf_log_register(pf, &nfulnl_logger); |
| 846 | break; |
| 847 | case NFULNL_CFG_CMD_PF_UNBIND: |
| 848 | UDEBUG("unregistering log handler for pf=%u\n", pf); |
| 849 | /* This is a bug and a feature. We cannot unregister |
| 850 | * other handlers, like nfnetlink_inst can */ |
| 851 | nf_log_unregister_pf(pf); |
| 852 | break; |
| 853 | default: |
| 854 | ret = -EINVAL; |
| 855 | break; |
| 856 | } |
| 857 | } else { |
| 858 | if (!inst) { |
| 859 | UDEBUG("no config command, and no instance for " |
| 860 | "group=%u pid=%u =>ENOENT\n", |
| 861 | group_num, NETLINK_CB(skb).pid); |
| 862 | ret = -ENOENT; |
| 863 | goto out_put; |
| 864 | } |
| 865 | |
| 866 | if (inst->peer_pid != NETLINK_CB(skb).pid) { |
| 867 | UDEBUG("no config command, and wrong pid\n"); |
| 868 | ret = -EPERM; |
| 869 | goto out_put; |
| 870 | } |
| 871 | } |
| 872 | |
| 873 | if (nfula[NFULA_CFG_MODE-1]) { |
| 874 | struct nfulnl_msg_config_mode *params; |
| 875 | params = NFA_DATA(nfula[NFULA_CFG_MODE-1]); |
| 876 | |
| 877 | nfulnl_set_mode(inst, params->copy_mode, |
| 878 | ntohs(params->copy_range)); |
| 879 | } |
| 880 | |
| 881 | if (nfula[NFULA_CFG_TIMEOUT-1]) { |
| 882 | u_int32_t timeout = |
| 883 | *(u_int32_t *)NFA_DATA(nfula[NFULA_CFG_TIMEOUT-1]); |
| 884 | |
| 885 | nfulnl_set_timeout(inst, ntohl(timeout)); |
| 886 | } |
| 887 | |
| 888 | if (nfula[NFULA_CFG_NLBUFSIZ-1]) { |
| 889 | u_int32_t nlbufsiz = |
| 890 | *(u_int32_t *)NFA_DATA(nfula[NFULA_CFG_NLBUFSIZ-1]); |
| 891 | |
| 892 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); |
| 893 | } |
| 894 | |
| 895 | if (nfula[NFULA_CFG_QTHRESH-1]) { |
| 896 | u_int32_t qthresh = |
| 897 | *(u_int16_t *)NFA_DATA(nfula[NFULA_CFG_QTHRESH-1]); |
| 898 | |
| 899 | nfulnl_set_qthresh(inst, ntohl(qthresh)); |
| 900 | } |
| 901 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 902 | if (nfula[NFULA_CFG_FLAGS-1]) { |
| 903 | u_int16_t flags = |
| 904 | *(u_int16_t *)NFA_DATA(nfula[NFULA_CFG_FLAGS-1]); |
| 905 | nfulnl_set_flags(inst, ntohl(flags)); |
| 906 | } |
| 907 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 908 | out_put: |
| 909 | instance_put(inst); |
| 910 | return ret; |
| 911 | } |
| 912 | |
| 913 | static struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
| 914 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
Harald Welte | 37d2e7a | 2005-11-14 15:24:59 -0800 | [diff] [blame] | 915 | .attr_count = NFULA_MAX, }, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 916 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
Harald Welte | 37d2e7a | 2005-11-14 15:24:59 -0800 | [diff] [blame] | 917 | .attr_count = NFULA_CFG_MAX, }, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 918 | }; |
| 919 | |
| 920 | static struct nfnetlink_subsystem nfulnl_subsys = { |
| 921 | .name = "log", |
| 922 | .subsys_id = NFNL_SUBSYS_ULOG, |
| 923 | .cb_count = NFULNL_MSG_MAX, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 924 | .cb = nfulnl_cb, |
| 925 | }; |
| 926 | |
| 927 | #ifdef CONFIG_PROC_FS |
| 928 | struct iter_state { |
| 929 | unsigned int bucket; |
| 930 | }; |
| 931 | |
| 932 | static struct hlist_node *get_first(struct seq_file *seq) |
| 933 | { |
| 934 | struct iter_state *st = seq->private; |
| 935 | |
| 936 | if (!st) |
| 937 | return NULL; |
| 938 | |
| 939 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
| 940 | if (!hlist_empty(&instance_table[st->bucket])) |
| 941 | return instance_table[st->bucket].first; |
| 942 | } |
| 943 | return NULL; |
| 944 | } |
| 945 | |
| 946 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) |
| 947 | { |
| 948 | struct iter_state *st = seq->private; |
| 949 | |
| 950 | h = h->next; |
| 951 | while (!h) { |
| 952 | if (++st->bucket >= INSTANCE_BUCKETS) |
| 953 | return NULL; |
| 954 | |
| 955 | h = instance_table[st->bucket].first; |
| 956 | } |
| 957 | return h; |
| 958 | } |
| 959 | |
| 960 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) |
| 961 | { |
| 962 | struct hlist_node *head; |
| 963 | head = get_first(seq); |
| 964 | |
| 965 | if (head) |
| 966 | while (pos && (head = get_next(seq, head))) |
| 967 | pos--; |
| 968 | return pos ? NULL : head; |
| 969 | } |
| 970 | |
| 971 | static void *seq_start(struct seq_file *seq, loff_t *pos) |
| 972 | { |
| 973 | read_lock_bh(&instances_lock); |
| 974 | return get_idx(seq, *pos); |
| 975 | } |
| 976 | |
| 977 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 978 | { |
| 979 | (*pos)++; |
| 980 | return get_next(s, v); |
| 981 | } |
| 982 | |
| 983 | static void seq_stop(struct seq_file *s, void *v) |
| 984 | { |
| 985 | read_unlock_bh(&instances_lock); |
| 986 | } |
| 987 | |
| 988 | static int seq_show(struct seq_file *s, void *v) |
| 989 | { |
| 990 | const struct nfulnl_instance *inst = v; |
| 991 | |
| 992 | return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", |
| 993 | inst->group_num, |
| 994 | inst->peer_pid, inst->qlen, |
| 995 | inst->copy_mode, inst->copy_range, |
| 996 | inst->flushtimeout, atomic_read(&inst->use)); |
| 997 | } |
| 998 | |
| 999 | static struct seq_operations nful_seq_ops = { |
| 1000 | .start = seq_start, |
| 1001 | .next = seq_next, |
| 1002 | .stop = seq_stop, |
| 1003 | .show = seq_show, |
| 1004 | }; |
| 1005 | |
| 1006 | static int nful_open(struct inode *inode, struct file *file) |
| 1007 | { |
| 1008 | struct seq_file *seq; |
| 1009 | struct iter_state *is; |
| 1010 | int ret; |
| 1011 | |
Harald Welte | 10dfdc6 | 2005-11-03 19:20:07 +0100 | [diff] [blame] | 1012 | is = kzalloc(sizeof(*is), GFP_KERNEL); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1013 | if (!is) |
| 1014 | return -ENOMEM; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1015 | ret = seq_open(file, &nful_seq_ops); |
| 1016 | if (ret < 0) |
| 1017 | goto out_free; |
| 1018 | seq = file->private_data; |
| 1019 | seq->private = is; |
| 1020 | return ret; |
| 1021 | out_free: |
| 1022 | kfree(is); |
| 1023 | return ret; |
| 1024 | } |
| 1025 | |
| 1026 | static struct file_operations nful_file_ops = { |
| 1027 | .owner = THIS_MODULE, |
| 1028 | .open = nful_open, |
| 1029 | .read = seq_read, |
| 1030 | .llseek = seq_lseek, |
| 1031 | .release = seq_release_private, |
| 1032 | }; |
| 1033 | |
| 1034 | #endif /* PROC_FS */ |
| 1035 | |
| 1036 | static int |
| 1037 | init_or_cleanup(int init) |
| 1038 | { |
| 1039 | int i, status = -ENOMEM; |
| 1040 | #ifdef CONFIG_PROC_FS |
| 1041 | struct proc_dir_entry *proc_nful; |
| 1042 | #endif |
| 1043 | |
| 1044 | if (!init) |
| 1045 | goto cleanup; |
| 1046 | |
| 1047 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
| 1048 | INIT_HLIST_HEAD(&instance_table[i]); |
| 1049 | |
| 1050 | /* it's not really all that important to have a random value, so |
| 1051 | * we can do this from the init function, even if there hasn't |
| 1052 | * been that much entropy yet */ |
| 1053 | get_random_bytes(&hash_init, sizeof(hash_init)); |
| 1054 | |
| 1055 | netlink_register_notifier(&nfulnl_rtnl_notifier); |
| 1056 | status = nfnetlink_subsys_register(&nfulnl_subsys); |
| 1057 | if (status < 0) { |
| 1058 | printk(KERN_ERR "log: failed to create netlink socket\n"); |
| 1059 | goto cleanup_netlink_notifier; |
| 1060 | } |
| 1061 | |
| 1062 | #ifdef CONFIG_PROC_FS |
| 1063 | proc_nful = create_proc_entry("nfnetlink_log", 0440, |
| 1064 | proc_net_netfilter); |
| 1065 | if (!proc_nful) |
| 1066 | goto cleanup_subsys; |
| 1067 | proc_nful->proc_fops = &nful_file_ops; |
| 1068 | #endif |
| 1069 | |
| 1070 | return status; |
| 1071 | |
| 1072 | cleanup: |
| 1073 | nf_log_unregister_logger(&nfulnl_logger); |
| 1074 | #ifdef CONFIG_PROC_FS |
| 1075 | remove_proc_entry("nfnetlink_log", proc_net_netfilter); |
| 1076 | cleanup_subsys: |
| 1077 | #endif |
| 1078 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
| 1079 | cleanup_netlink_notifier: |
| 1080 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); |
| 1081 | return status; |
| 1082 | } |
| 1083 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1084 | static int __init nfnetlink_log_init(void) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1085 | { |
| 1086 | |
| 1087 | return init_or_cleanup(1); |
| 1088 | } |
| 1089 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1090 | static void __exit nfnetlink_log_fini(void) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1091 | { |
| 1092 | init_or_cleanup(0); |
| 1093 | } |
| 1094 | |
| 1095 | MODULE_DESCRIPTION("netfilter userspace logging"); |
| 1096 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); |
| 1097 | MODULE_LICENSE("GPL"); |
Harald Welte | f682fae | 2005-08-09 20:20:34 -0700 | [diff] [blame] | 1098 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1099 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1100 | module_init(nfnetlink_log_init); |
| 1101 | module_exit(nfnetlink_log_fini); |