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> |
Patrick McHardy | f01ffbd | 2007-12-17 22:38:49 -0800 | [diff] [blame] | 32 | #include <net/netfilter/nf_log.h> |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 33 | |
| 34 | #include <asm/atomic.h> |
| 35 | |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 36 | #ifdef CONFIG_BRIDGE_NETFILTER |
| 37 | #include "../bridge/br_private.h" |
| 38 | #endif |
| 39 | |
Holger Eitzenberger | c2db292 | 2006-02-04 02:13:14 -0800 | [diff] [blame] | 40 | #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE |
Michal Miroslaw | 6b6ec99 | 2007-09-28 14:45:52 -0700 | [diff] [blame] | 41 | #define NFULNL_TIMEOUT_DEFAULT HZ /* every second */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 42 | #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ |
Michal Miroslaw | 6b6ec99 | 2007-09-28 14:45:52 -0700 | [diff] [blame] | 43 | #define NFULNL_COPY_RANGE_MAX 0xFFFF /* max packet size is limited by 16-bit struct nfattr nfa_len field */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 44 | |
| 45 | #define PRINTR(x, args...) do { if (net_ratelimit()) \ |
| 46 | printk(x, ## args); } while (0); |
| 47 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 48 | struct nfulnl_instance { |
| 49 | struct hlist_node hlist; /* global list of instances */ |
| 50 | spinlock_t lock; |
| 51 | atomic_t use; /* use count */ |
| 52 | |
| 53 | unsigned int qlen; /* number of nlmsgs in skb */ |
| 54 | struct sk_buff *skb; /* pre-allocatd skb */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 55 | struct timer_list timer; |
| 56 | int peer_pid; /* PID of the peer process */ |
| 57 | |
| 58 | /* configurable parameters */ |
| 59 | unsigned int flushtimeout; /* timeout until queue flush */ |
| 60 | unsigned int nlbufsiz; /* netlink buffer allocation size */ |
| 61 | unsigned int qthreshold; /* threshold of the queue */ |
| 62 | u_int32_t copy_range; |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 63 | u_int32_t seq; /* instance-local sequential counter */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 64 | u_int16_t group_num; /* number of this queue */ |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 65 | u_int16_t flags; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 66 | u_int8_t copy_mode; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 67 | }; |
| 68 | |
| 69 | static DEFINE_RWLOCK(instances_lock); |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 70 | static atomic_t global_seq; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 71 | |
| 72 | #define INSTANCE_BUCKETS 16 |
| 73 | static struct hlist_head instance_table[INSTANCE_BUCKETS]; |
| 74 | static unsigned int hash_init; |
| 75 | |
| 76 | static inline u_int8_t instance_hashfn(u_int16_t group_num) |
| 77 | { |
| 78 | return ((group_num & 0xff) % INSTANCE_BUCKETS); |
| 79 | } |
| 80 | |
| 81 | static struct nfulnl_instance * |
| 82 | __instance_lookup(u_int16_t group_num) |
| 83 | { |
| 84 | struct hlist_head *head; |
| 85 | struct hlist_node *pos; |
| 86 | struct nfulnl_instance *inst; |
| 87 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 88 | head = &instance_table[instance_hashfn(group_num)]; |
| 89 | hlist_for_each_entry(inst, pos, head, hlist) { |
| 90 | if (inst->group_num == group_num) |
| 91 | return inst; |
| 92 | } |
| 93 | return NULL; |
| 94 | } |
| 95 | |
| 96 | static inline void |
| 97 | instance_get(struct nfulnl_instance *inst) |
| 98 | { |
| 99 | atomic_inc(&inst->use); |
| 100 | } |
| 101 | |
| 102 | static struct nfulnl_instance * |
| 103 | instance_lookup_get(u_int16_t group_num) |
| 104 | { |
| 105 | struct nfulnl_instance *inst; |
| 106 | |
| 107 | read_lock_bh(&instances_lock); |
| 108 | inst = __instance_lookup(group_num); |
| 109 | if (inst) |
| 110 | instance_get(inst); |
| 111 | read_unlock_bh(&instances_lock); |
| 112 | |
| 113 | return inst; |
| 114 | } |
| 115 | |
| 116 | static void |
| 117 | instance_put(struct nfulnl_instance *inst) |
| 118 | { |
| 119 | if (inst && atomic_dec_and_test(&inst->use)) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 120 | kfree(inst); |
Patrick McHardy | 7d90e86 | 2007-03-04 15:59:45 -0800 | [diff] [blame] | 121 | module_put(THIS_MODULE); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 122 | } |
| 123 | } |
| 124 | |
| 125 | static void nfulnl_timer(unsigned long data); |
| 126 | |
| 127 | static struct nfulnl_instance * |
| 128 | instance_create(u_int16_t group_num, int pid) |
| 129 | { |
| 130 | struct nfulnl_instance *inst; |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 131 | int err; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 132 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 133 | write_lock_bh(&instances_lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 134 | if (__instance_lookup(group_num)) { |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 135 | err = -EEXIST; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 136 | goto out_unlock; |
| 137 | } |
| 138 | |
Harald Welte | 10dfdc6 | 2005-11-03 19:20:07 +0100 | [diff] [blame] | 139 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 140 | if (!inst) { |
| 141 | err = -ENOMEM; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 142 | goto out_unlock; |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 143 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 144 | |
Michal Miroslaw | aace57e | 2007-09-28 14:45:27 -0700 | [diff] [blame] | 145 | if (!try_module_get(THIS_MODULE)) { |
| 146 | kfree(inst); |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 147 | err = -EAGAIN; |
Michal Miroslaw | aace57e | 2007-09-28 14:45:27 -0700 | [diff] [blame] | 148 | goto out_unlock; |
| 149 | } |
| 150 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 151 | INIT_HLIST_NODE(&inst->hlist); |
YOSHIFUJI Hideaki | 181a46a | 2006-01-04 13:56:54 -0800 | [diff] [blame] | 152 | spin_lock_init(&inst->lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 153 | /* needs to be two, since we _put() after creation */ |
| 154 | atomic_set(&inst->use, 2); |
| 155 | |
Patrick McHardy | e6f689d | 2007-03-23 11:16:30 -0700 | [diff] [blame] | 156 | setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 157 | |
| 158 | inst->peer_pid = pid; |
| 159 | inst->group_num = group_num; |
| 160 | |
| 161 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; |
| 162 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; |
| 163 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; |
| 164 | inst->copy_mode = NFULNL_COPY_PACKET; |
Michal Miroslaw | 6b6ec99 | 2007-09-28 14:45:52 -0700 | [diff] [blame] | 165 | inst->copy_range = NFULNL_COPY_RANGE_MAX; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 166 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 167 | hlist_add_head(&inst->hlist, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 168 | &instance_table[instance_hashfn(group_num)]); |
| 169 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 170 | write_unlock_bh(&instances_lock); |
| 171 | |
| 172 | return inst; |
| 173 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 174 | out_unlock: |
| 175 | write_unlock_bh(&instances_lock); |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 176 | return ERR_PTR(err); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 177 | } |
| 178 | |
Michal Miroslaw | e356706 | 2007-09-28 14:44:21 -0700 | [diff] [blame] | 179 | static void __nfulnl_flush(struct nfulnl_instance *inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 180 | |
| 181 | static void |
Patrick McHardy | 9afdb00 | 2007-03-23 11:12:50 -0700 | [diff] [blame] | 182 | __instance_destroy(struct nfulnl_instance *inst) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 183 | { |
| 184 | /* first pull it out of the global list */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 185 | hlist_del(&inst->hlist); |
| 186 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 187 | /* then flush all pending packets from skb */ |
| 188 | |
| 189 | spin_lock_bh(&inst->lock); |
Michal Miroslaw | e356706 | 2007-09-28 14:44:21 -0700 | [diff] [blame] | 190 | if (inst->skb) |
| 191 | __nfulnl_flush(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 192 | spin_unlock_bh(&inst->lock); |
| 193 | |
| 194 | /* and finally put the refcount */ |
| 195 | instance_put(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 196 | } |
| 197 | |
| 198 | static inline void |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 199 | instance_destroy(struct nfulnl_instance *inst) |
| 200 | { |
Patrick McHardy | 9afdb00 | 2007-03-23 11:12:50 -0700 | [diff] [blame] | 201 | write_lock_bh(&instances_lock); |
| 202 | __instance_destroy(inst); |
| 203 | write_unlock_bh(&instances_lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 204 | } |
| 205 | |
| 206 | static int |
| 207 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, |
| 208 | unsigned int range) |
| 209 | { |
| 210 | int status = 0; |
| 211 | |
| 212 | spin_lock_bh(&inst->lock); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 213 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 214 | switch (mode) { |
| 215 | case NFULNL_COPY_NONE: |
| 216 | case NFULNL_COPY_META: |
| 217 | inst->copy_mode = mode; |
| 218 | inst->copy_range = 0; |
| 219 | break; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 220 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 221 | case NFULNL_COPY_PACKET: |
| 222 | inst->copy_mode = mode; |
Michal Miroslaw | 6b6ec99 | 2007-09-28 14:45:52 -0700 | [diff] [blame] | 223 | inst->copy_range = min_t(unsigned int, |
| 224 | range, NFULNL_COPY_RANGE_MAX); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 225 | break; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 226 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 227 | default: |
| 228 | status = -EINVAL; |
| 229 | break; |
| 230 | } |
| 231 | |
| 232 | spin_unlock_bh(&inst->lock); |
| 233 | |
| 234 | return status; |
| 235 | } |
| 236 | |
| 237 | static int |
| 238 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) |
| 239 | { |
| 240 | int status; |
| 241 | |
| 242 | spin_lock_bh(&inst->lock); |
| 243 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) |
| 244 | status = -ERANGE; |
| 245 | else if (nlbufsiz > 131072) |
| 246 | status = -ERANGE; |
| 247 | else { |
| 248 | inst->nlbufsiz = nlbufsiz; |
| 249 | status = 0; |
| 250 | } |
| 251 | spin_unlock_bh(&inst->lock); |
| 252 | |
| 253 | return status; |
| 254 | } |
| 255 | |
| 256 | static int |
| 257 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) |
| 258 | { |
| 259 | spin_lock_bh(&inst->lock); |
| 260 | inst->flushtimeout = timeout; |
| 261 | spin_unlock_bh(&inst->lock); |
| 262 | |
| 263 | return 0; |
| 264 | } |
| 265 | |
| 266 | static int |
| 267 | nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) |
| 268 | { |
| 269 | spin_lock_bh(&inst->lock); |
| 270 | inst->qthreshold = qthresh; |
| 271 | spin_unlock_bh(&inst->lock); |
| 272 | |
| 273 | return 0; |
| 274 | } |
| 275 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 276 | static int |
| 277 | nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) |
| 278 | { |
| 279 | spin_lock_bh(&inst->lock); |
Patrick McHardy | ee43353 | 2006-05-19 02:17:18 -0700 | [diff] [blame] | 280 | inst->flags = flags; |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 281 | spin_unlock_bh(&inst->lock); |
| 282 | |
| 283 | return 0; |
| 284 | } |
| 285 | |
Michal Miroslaw | c6a8f64 | 2007-09-28 14:45:06 -0700 | [diff] [blame] | 286 | static struct sk_buff * |
| 287 | nfulnl_alloc_skb(unsigned int inst_size, unsigned int pkt_size) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 288 | { |
| 289 | struct sk_buff *skb; |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 290 | unsigned int n; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 291 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 292 | /* alloc skb which should be big enough for a whole multipart |
| 293 | * message. WARNING: has to be <= 128k due to slab restrictions */ |
| 294 | |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 295 | n = max(inst_size, pkt_size); |
| 296 | skb = alloc_skb(n, GFP_ATOMIC); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 297 | if (!skb) { |
| 298 | PRINTR("nfnetlink_log: can't alloc whole buffer (%u bytes)\n", |
| 299 | inst_size); |
| 300 | |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 301 | if (n > pkt_size) { |
| 302 | /* try to allocate only as much as we need for current |
| 303 | * packet */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 304 | |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 305 | skb = alloc_skb(pkt_size, GFP_ATOMIC); |
| 306 | if (!skb) |
| 307 | PRINTR("nfnetlink_log: can't even alloc %u " |
| 308 | "bytes\n", pkt_size); |
| 309 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 310 | } |
| 311 | |
| 312 | return skb; |
| 313 | } |
| 314 | |
| 315 | static int |
| 316 | __nfulnl_send(struct nfulnl_instance *inst) |
| 317 | { |
Eric Leblond | 29c5d4a | 2007-09-18 13:07:15 -0700 | [diff] [blame] | 318 | int status = -1; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 319 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 320 | if (inst->qlen > 1) |
Eric Leblond | 29c5d4a | 2007-09-18 13:07:15 -0700 | [diff] [blame] | 321 | NLMSG_PUT(inst->skb, 0, 0, |
| 322 | NLMSG_DONE, |
| 323 | sizeof(struct nfgenmsg)); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 324 | |
| 325 | status = nfnetlink_unicast(inst->skb, inst->peer_pid, MSG_DONTWAIT); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 326 | |
| 327 | inst->qlen = 0; |
| 328 | inst->skb = NULL; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 329 | |
Eric Leblond | 29c5d4a | 2007-09-18 13:07:15 -0700 | [diff] [blame] | 330 | nlmsg_failure: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 331 | return status; |
| 332 | } |
| 333 | |
Michal Miroslaw | e356706 | 2007-09-28 14:44:21 -0700 | [diff] [blame] | 334 | static void |
| 335 | __nfulnl_flush(struct nfulnl_instance *inst) |
| 336 | { |
| 337 | /* timer holds a reference */ |
| 338 | if (del_timer(&inst->timer)) |
| 339 | instance_put(inst); |
| 340 | if (inst->skb) |
| 341 | __nfulnl_send(inst); |
| 342 | } |
| 343 | |
Michal Miroslaw | c6a8f64 | 2007-09-28 14:45:06 -0700 | [diff] [blame] | 344 | static void |
| 345 | nfulnl_timer(unsigned long data) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 346 | { |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 347 | struct nfulnl_instance *inst = (struct nfulnl_instance *)data; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 348 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 349 | spin_lock_bh(&inst->lock); |
Michal Miroslaw | 370e6a8 | 2007-03-23 11:12:21 -0700 | [diff] [blame] | 350 | if (inst->skb) |
| 351 | __nfulnl_send(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 352 | spin_unlock_bh(&inst->lock); |
Michal Miroslaw | 05f7b7b | 2007-03-04 15:58:40 -0800 | [diff] [blame] | 353 | instance_put(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 354 | } |
| 355 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 356 | /* This is an inline function, we don't really care about a long |
| 357 | * list of arguments */ |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 358 | static inline int |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 359 | __build_packet_message(struct nfulnl_instance *inst, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 360 | const struct sk_buff *skb, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 361 | unsigned int data_len, |
| 362 | unsigned int pf, |
| 363 | unsigned int hooknum, |
| 364 | const struct net_device *indev, |
| 365 | const struct net_device *outdev, |
| 366 | const struct nf_loginfo *li, |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 367 | const char *prefix, unsigned int plen) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 368 | { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 369 | struct nfulnl_msg_packet_hdr pmsg; |
| 370 | struct nlmsghdr *nlh; |
| 371 | struct nfgenmsg *nfmsg; |
Al Viro | 98a4a86 | 2006-11-08 00:26:51 -0800 | [diff] [blame] | 372 | __be32 tmp_uint; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 373 | sk_buff_data_t old_tail = inst->skb->tail; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 374 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 375 | nlh = NLMSG_PUT(inst->skb, 0, 0, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 376 | NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, |
| 377 | sizeof(struct nfgenmsg)); |
| 378 | nfmsg = NLMSG_DATA(nlh); |
| 379 | nfmsg->nfgen_family = pf; |
| 380 | nfmsg->version = NFNETLINK_V0; |
| 381 | nfmsg->res_id = htons(inst->group_num); |
| 382 | |
Al Viro | febf0a4 | 2006-11-03 00:59:17 -0800 | [diff] [blame] | 383 | pmsg.hw_protocol = skb->protocol; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 384 | pmsg.hook = hooknum; |
| 385 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 386 | NLA_PUT(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 387 | |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 388 | if (prefix) |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 389 | NLA_PUT(inst->skb, NFULA_PREFIX, plen, prefix); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 390 | |
| 391 | if (indev) { |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 392 | #ifndef CONFIG_BRIDGE_NETFILTER |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 393 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_INDEV, |
| 394 | htonl(indev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 395 | #else |
| 396 | if (pf == PF_BRIDGE) { |
| 397 | /* Case 1: outdev is physical input device, we need to |
| 398 | * look for bridge group (when called from |
| 399 | * netfilter_bridge) */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 400 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
| 401 | htonl(indev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 402 | /* this is the bridge group "brX" */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 403 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_INDEV, |
| 404 | htonl(indev->br_port->br->dev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 405 | } else { |
| 406 | /* Case 2: indev is bridge group, we need to look for |
| 407 | * physical device (when called from ipv4) */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 408 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_INDEV, |
| 409 | htonl(indev->ifindex)); |
| 410 | if (skb->nf_bridge && skb->nf_bridge->physindev) |
| 411 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
| 412 | htonl(skb->nf_bridge->physindev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 413 | } |
| 414 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 415 | } |
| 416 | |
| 417 | if (outdev) { |
| 418 | tmp_uint = htonl(outdev->ifindex); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 419 | #ifndef CONFIG_BRIDGE_NETFILTER |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 420 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_OUTDEV, |
| 421 | htonl(outdev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 422 | #else |
| 423 | if (pf == PF_BRIDGE) { |
| 424 | /* Case 1: outdev is physical output device, we need to |
| 425 | * look for bridge group (when called from |
| 426 | * netfilter_bridge) */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 427 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
| 428 | htonl(outdev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 429 | /* this is the bridge group "brX" */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 430 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_OUTDEV, |
| 431 | htonl(outdev->br_port->br->dev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 432 | } else { |
| 433 | /* Case 2: indev is a bridge group, we need to look |
| 434 | * for physical device (when called from ipv4) */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 435 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_OUTDEV, |
| 436 | htonl(outdev->ifindex)); |
| 437 | if (skb->nf_bridge && skb->nf_bridge->physoutdev) |
| 438 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
| 439 | htonl(skb->nf_bridge->physoutdev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 440 | } |
| 441 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 442 | } |
| 443 | |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 444 | if (skb->mark) |
| 445 | NLA_PUT_BE32(inst->skb, NFULA_MARK, htonl(skb->mark)); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 446 | |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 447 | if (indev && skb->dev) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 448 | struct nfulnl_msg_packet_hw phw; |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 449 | int len = dev_parse_header(skb, phw.hw_addr); |
| 450 | if (len > 0) { |
| 451 | phw.hw_addrlen = htons(len); |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 452 | NLA_PUT(inst->skb, NFULA_HWADDR, sizeof(phw), &phw); |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 453 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 454 | } |
| 455 | |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 456 | if (skb->tstamp.tv64) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 457 | struct nfulnl_msg_packet_timestamp ts; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 458 | struct timeval tv = ktime_to_timeval(skb->tstamp); |
| 459 | ts.sec = cpu_to_be64(tv.tv_sec); |
| 460 | ts.usec = cpu_to_be64(tv.tv_usec); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 461 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 462 | NLA_PUT(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 463 | } |
| 464 | |
| 465 | /* UID */ |
| 466 | if (skb->sk) { |
| 467 | read_lock_bh(&skb->sk->sk_callback_lock); |
| 468 | if (skb->sk->sk_socket && skb->sk->sk_socket->file) { |
Al Viro | 98a4a86 | 2006-11-08 00:26:51 -0800 | [diff] [blame] | 469 | __be32 uid = htonl(skb->sk->sk_socket->file->f_uid); |
Patrick McHardy | 76aa1ce | 2007-12-17 22:41:52 -0800 | [diff] [blame^] | 470 | __be32 gid = htons(skb->sk->sk_socket->file->f_gid); |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 471 | /* need to unlock here since NLA_PUT may goto */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 472 | read_unlock_bh(&skb->sk->sk_callback_lock); |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 473 | NLA_PUT_BE32(inst->skb, NFULA_UID, uid); |
Patrick McHardy | 76aa1ce | 2007-12-17 22:41:52 -0800 | [diff] [blame^] | 474 | NLA_PUT_BE32(inst->skb, NFULA_GID, gid); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 475 | } else |
| 476 | read_unlock_bh(&skb->sk->sk_callback_lock); |
| 477 | } |
| 478 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 479 | /* local sequence number */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 480 | if (inst->flags & NFULNL_CFG_F_SEQ) |
| 481 | NLA_PUT_BE32(inst->skb, NFULA_SEQ, htonl(inst->seq++)); |
| 482 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 483 | /* global sequence number */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 484 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
| 485 | NLA_PUT_BE32(inst->skb, NFULA_SEQ_GLOBAL, |
| 486 | htonl(atomic_inc_return(&global_seq))); |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 487 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 488 | if (data_len) { |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 489 | struct nlattr *nla; |
| 490 | int size = nla_attr_size(data_len); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 491 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 492 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 493 | printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); |
| 494 | goto nlmsg_failure; |
| 495 | } |
| 496 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 497 | nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); |
| 498 | nla->nla_type = NFULA_PAYLOAD; |
| 499 | nla->nla_len = size; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 500 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 501 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 502 | BUG(); |
| 503 | } |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 504 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 505 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
| 506 | return 0; |
| 507 | |
| 508 | nlmsg_failure: |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 509 | nla_put_failure: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 510 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
| 511 | return -1; |
| 512 | } |
| 513 | |
| 514 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) |
| 515 | |
| 516 | static struct nf_loginfo default_loginfo = { |
| 517 | .type = NF_LOG_TYPE_ULOG, |
| 518 | .u = { |
| 519 | .ulog = { |
| 520 | .copy_len = 0xffff, |
| 521 | .group = 0, |
| 522 | .qthreshold = 1, |
| 523 | }, |
| 524 | }, |
| 525 | }; |
| 526 | |
| 527 | /* log handler for internal netfilter logging api */ |
| 528 | static void |
| 529 | nfulnl_log_packet(unsigned int pf, |
| 530 | unsigned int hooknum, |
| 531 | const struct sk_buff *skb, |
| 532 | const struct net_device *in, |
| 533 | const struct net_device *out, |
| 534 | const struct nf_loginfo *li_user, |
| 535 | const char *prefix) |
| 536 | { |
| 537 | unsigned int size, data_len; |
| 538 | struct nfulnl_instance *inst; |
| 539 | const struct nf_loginfo *li; |
| 540 | unsigned int qthreshold; |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 541 | unsigned int plen; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 542 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 543 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 544 | li = li_user; |
| 545 | else |
| 546 | li = &default_loginfo; |
| 547 | |
| 548 | inst = instance_lookup_get(li->u.ulog.group); |
| 549 | if (!inst) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 550 | return; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 551 | |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 552 | plen = 0; |
| 553 | if (prefix) |
Patrick McHardy | 881dbfe | 2007-03-06 20:24:35 -0800 | [diff] [blame] | 554 | plen = strlen(prefix) + 1; |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 555 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 556 | /* FIXME: do we want to make the size calculation conditional based on |
| 557 | * what is actually present? way more branches and checks, but more |
| 558 | * memory efficient... */ |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 559 | size = NLMSG_ALIGN(sizeof(struct nfgenmsg)) |
| 560 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) |
| 561 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
| 562 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 563 | #ifdef CONFIG_BRIDGE_NETFILTER |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 564 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
| 565 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 566 | #endif |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 567 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
| 568 | + nla_total_size(sizeof(u_int32_t)) /* uid */ |
Patrick McHardy | 76aa1ce | 2007-12-17 22:41:52 -0800 | [diff] [blame^] | 569 | + nla_total_size(sizeof(u_int32_t)) /* gid */ |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 570 | + nla_total_size(plen) /* prefix */ |
| 571 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) |
| 572 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 573 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 574 | spin_lock_bh(&inst->lock); |
| 575 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 576 | if (inst->flags & NFULNL_CFG_F_SEQ) |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 577 | size += nla_total_size(sizeof(u_int32_t)); |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 578 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 579 | size += nla_total_size(sizeof(u_int32_t)); |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 580 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 581 | qthreshold = inst->qthreshold; |
| 582 | /* per-rule qthreshold overrides per-instance */ |
| 583 | if (qthreshold > li->u.ulog.qthreshold) |
| 584 | qthreshold = li->u.ulog.qthreshold; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 585 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 586 | switch (inst->copy_mode) { |
| 587 | case NFULNL_COPY_META: |
| 588 | case NFULNL_COPY_NONE: |
| 589 | data_len = 0; |
| 590 | break; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 591 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 592 | case NFULNL_COPY_PACKET: |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 593 | if (inst->copy_range == 0 |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 594 | || inst->copy_range > skb->len) |
| 595 | data_len = skb->len; |
| 596 | else |
| 597 | data_len = inst->copy_range; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 598 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 599 | size += nla_total_size(data_len); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 600 | break; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 601 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 602 | default: |
Michal Miroslaw | 55b5a91 | 2007-03-23 11:11:05 -0700 | [diff] [blame] | 603 | goto unlock_and_release; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 604 | } |
| 605 | |
Michal Miroslaw | d63b043 | 2007-09-28 14:44:44 -0700 | [diff] [blame] | 606 | if (inst->skb && |
| 607 | size > skb_tailroom(inst->skb) - sizeof(struct nfgenmsg)) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 608 | /* either the queue len is too high or we don't have |
| 609 | * enough room in the skb left. flush to userspace. */ |
Michal Miroslaw | e356706 | 2007-09-28 14:44:21 -0700 | [diff] [blame] | 610 | __nfulnl_flush(inst); |
Michal Miroslaw | 55b5a91 | 2007-03-23 11:11:05 -0700 | [diff] [blame] | 611 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 612 | |
Michal Miroslaw | 55b5a91 | 2007-03-23 11:11:05 -0700 | [diff] [blame] | 613 | if (!inst->skb) { |
| 614 | inst->skb = nfulnl_alloc_skb(inst->nlbufsiz, size); |
| 615 | if (!inst->skb) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 616 | goto alloc_failure; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 617 | } |
| 618 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 619 | inst->qlen++; |
| 620 | |
| 621 | __build_packet_message(inst, skb, data_len, pf, |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 622 | hooknum, in, out, li, prefix, plen); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 623 | |
Michal Miroslaw | d63b043 | 2007-09-28 14:44:44 -0700 | [diff] [blame] | 624 | if (inst->qlen >= qthreshold) |
| 625 | __nfulnl_flush(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 626 | /* timer_pending always called within inst->lock, so there |
| 627 | * is no chance of a race here */ |
Michal Miroslaw | d63b043 | 2007-09-28 14:44:44 -0700 | [diff] [blame] | 628 | else if (!timer_pending(&inst->timer)) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 629 | instance_get(inst); |
| 630 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); |
| 631 | add_timer(&inst->timer); |
| 632 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 633 | |
Michal Miroslaw | ed32abe | 2007-03-04 15:58:15 -0800 | [diff] [blame] | 634 | unlock_and_release: |
| 635 | spin_unlock_bh(&inst->lock); |
| 636 | instance_put(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 637 | return; |
| 638 | |
| 639 | alloc_failure: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 640 | /* FIXME: statistics */ |
Michal Miroslaw | ed32abe | 2007-03-04 15:58:15 -0800 | [diff] [blame] | 641 | goto unlock_and_release; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 642 | } |
| 643 | |
| 644 | static int |
| 645 | nfulnl_rcv_nl_event(struct notifier_block *this, |
| 646 | unsigned long event, void *ptr) |
| 647 | { |
| 648 | struct netlink_notify *n = ptr; |
| 649 | |
| 650 | if (event == NETLINK_URELEASE && |
| 651 | n->protocol == NETLINK_NETFILTER && n->pid) { |
| 652 | int i; |
| 653 | |
| 654 | /* destroy all instances for this pid */ |
| 655 | write_lock_bh(&instances_lock); |
| 656 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
| 657 | struct hlist_node *tmp, *t2; |
| 658 | struct nfulnl_instance *inst; |
| 659 | struct hlist_head *head = &instance_table[i]; |
| 660 | |
| 661 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 662 | if ((n->net == &init_net) && |
| 663 | (n->pid == inst->peer_pid)) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 664 | __instance_destroy(inst); |
| 665 | } |
| 666 | } |
| 667 | write_unlock_bh(&instances_lock); |
| 668 | } |
| 669 | return NOTIFY_DONE; |
| 670 | } |
| 671 | |
| 672 | static struct notifier_block nfulnl_rtnl_notifier = { |
| 673 | .notifier_call = nfulnl_rcv_nl_event, |
| 674 | }; |
| 675 | |
| 676 | static int |
| 677 | nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 678 | struct nlmsghdr *nlh, struct nlattr *nfqa[]) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 679 | { |
| 680 | return -ENOTSUPP; |
| 681 | } |
| 682 | |
Patrick McHardy | 7b2f963 | 2007-12-17 22:39:08 -0800 | [diff] [blame] | 683 | static const struct nf_logger nfulnl_logger = { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 684 | .name = "nfnetlink_log", |
| 685 | .logfn = &nfulnl_log_packet, |
| 686 | .me = THIS_MODULE, |
| 687 | }; |
| 688 | |
Patrick McHardy | fd8281a | 2007-09-28 14:39:09 -0700 | [diff] [blame] | 689 | static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { |
| 690 | [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, |
| 691 | [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, |
| 692 | [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, |
| 693 | [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, |
| 694 | [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, |
| 695 | [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 696 | }; |
| 697 | |
| 698 | static int |
| 699 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 700 | struct nlmsghdr *nlh, struct nlattr *nfula[]) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 701 | { |
| 702 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 703 | u_int16_t group_num = ntohs(nfmsg->res_id); |
| 704 | struct nfulnl_instance *inst; |
| 705 | int ret = 0; |
| 706 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 707 | inst = instance_lookup_get(group_num); |
Patrick McHardy | c0506365 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 708 | if (inst && inst->peer_pid != NETLINK_CB(skb).pid) { |
| 709 | ret = -EPERM; |
| 710 | goto out_put; |
| 711 | } |
| 712 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 713 | if (nfula[NFULA_CFG_CMD]) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 714 | u_int8_t pf = nfmsg->nfgen_family; |
| 715 | struct nfulnl_msg_config_cmd *cmd; |
Patrick McHardy | c0506365 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 716 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 717 | cmd = nla_data(nfula[NFULA_CFG_CMD]); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 718 | |
| 719 | switch (cmd->command) { |
| 720 | case NFULNL_CFG_CMD_BIND: |
| 721 | if (inst) { |
| 722 | ret = -EBUSY; |
| 723 | goto out_put; |
| 724 | } |
| 725 | |
| 726 | inst = instance_create(group_num, |
| 727 | NETLINK_CB(skb).pid); |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 728 | if (IS_ERR(inst)) { |
| 729 | ret = PTR_ERR(inst); |
Michal Miroslaw | f414c16 | 2007-03-23 11:11:31 -0700 | [diff] [blame] | 730 | goto out; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 731 | } |
| 732 | break; |
| 733 | case NFULNL_CFG_CMD_UNBIND: |
| 734 | if (!inst) { |
| 735 | ret = -ENODEV; |
Michal Miroslaw | f414c16 | 2007-03-23 11:11:31 -0700 | [diff] [blame] | 736 | goto out; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 737 | } |
| 738 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 739 | instance_destroy(inst); |
Michal Miroslaw | 9a36e8c | 2007-03-23 11:11:48 -0700 | [diff] [blame] | 740 | goto out; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 741 | case NFULNL_CFG_CMD_PF_BIND: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 742 | ret = nf_log_register(pf, &nfulnl_logger); |
| 743 | break; |
| 744 | case NFULNL_CFG_CMD_PF_UNBIND: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 745 | /* This is a bug and a feature. We cannot unregister |
| 746 | * other handlers, like nfnetlink_inst can */ |
| 747 | nf_log_unregister_pf(pf); |
| 748 | break; |
| 749 | default: |
Patrick McHardy | cd21f0a | 2007-12-17 22:40:19 -0800 | [diff] [blame] | 750 | ret = -ENOTSUPP; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 751 | break; |
| 752 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 753 | } |
| 754 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 755 | if (nfula[NFULA_CFG_MODE]) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 756 | struct nfulnl_msg_config_mode *params; |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 757 | params = nla_data(nfula[NFULA_CFG_MODE]); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 758 | |
Patrick McHardy | c0506365 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 759 | if (!inst) { |
| 760 | ret = -ENODEV; |
| 761 | goto out; |
| 762 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 763 | nfulnl_set_mode(inst, params->copy_mode, |
Al Viro | d1208b9 | 2006-11-03 00:58:41 -0800 | [diff] [blame] | 764 | ntohl(params->copy_range)); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 765 | } |
| 766 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 767 | if (nfula[NFULA_CFG_TIMEOUT]) { |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 768 | __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 769 | |
Patrick McHardy | c0506365 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 770 | if (!inst) { |
| 771 | ret = -ENODEV; |
| 772 | goto out; |
| 773 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 774 | nfulnl_set_timeout(inst, ntohl(timeout)); |
| 775 | } |
| 776 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 777 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 778 | __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 779 | |
Patrick McHardy | c0506365 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 780 | if (!inst) { |
| 781 | ret = -ENODEV; |
| 782 | goto out; |
| 783 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 784 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); |
| 785 | } |
| 786 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 787 | if (nfula[NFULA_CFG_QTHRESH]) { |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 788 | __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 789 | |
Patrick McHardy | c0506365 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 790 | if (!inst) { |
| 791 | ret = -ENODEV; |
| 792 | goto out; |
| 793 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 794 | nfulnl_set_qthresh(inst, ntohl(qthresh)); |
| 795 | } |
| 796 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 797 | if (nfula[NFULA_CFG_FLAGS]) { |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 798 | __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]); |
Patrick McHardy | c0506365 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 799 | |
| 800 | if (!inst) { |
| 801 | ret = -ENODEV; |
| 802 | goto out; |
| 803 | } |
Patrick McHardy | ee43353 | 2006-05-19 02:17:18 -0700 | [diff] [blame] | 804 | nfulnl_set_flags(inst, ntohs(flags)); |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 805 | } |
| 806 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 807 | out_put: |
| 808 | instance_put(inst); |
Michal Miroslaw | dd16704 | 2007-03-04 15:59:20 -0800 | [diff] [blame] | 809 | out: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 810 | return ret; |
| 811 | } |
| 812 | |
Patrick McHardy | 7c8d4cb | 2007-09-28 14:15:45 -0700 | [diff] [blame] | 813 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 814 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
Harald Welte | 37d2e7a | 2005-11-14 15:24:59 -0800 | [diff] [blame] | 815 | .attr_count = NFULA_MAX, }, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 816 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
Patrick McHardy | fd8281a | 2007-09-28 14:39:09 -0700 | [diff] [blame] | 817 | .attr_count = NFULA_CFG_MAX, |
| 818 | .policy = nfula_cfg_policy }, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 819 | }; |
| 820 | |
Patrick McHardy | 7c8d4cb | 2007-09-28 14:15:45 -0700 | [diff] [blame] | 821 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 822 | .name = "log", |
| 823 | .subsys_id = NFNL_SUBSYS_ULOG, |
| 824 | .cb_count = NFULNL_MSG_MAX, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 825 | .cb = nfulnl_cb, |
| 826 | }; |
| 827 | |
| 828 | #ifdef CONFIG_PROC_FS |
| 829 | struct iter_state { |
| 830 | unsigned int bucket; |
| 831 | }; |
| 832 | |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 833 | static struct hlist_node *get_first(struct iter_state *st) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 834 | { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 835 | if (!st) |
| 836 | return NULL; |
| 837 | |
| 838 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
| 839 | if (!hlist_empty(&instance_table[st->bucket])) |
| 840 | return instance_table[st->bucket].first; |
| 841 | } |
| 842 | return NULL; |
| 843 | } |
| 844 | |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 845 | 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] | 846 | { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 847 | h = h->next; |
| 848 | while (!h) { |
| 849 | if (++st->bucket >= INSTANCE_BUCKETS) |
| 850 | return NULL; |
| 851 | |
| 852 | h = instance_table[st->bucket].first; |
| 853 | } |
| 854 | return h; |
| 855 | } |
| 856 | |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 857 | 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] | 858 | { |
| 859 | struct hlist_node *head; |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 860 | head = get_first(st); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 861 | |
| 862 | if (head) |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 863 | while (pos && (head = get_next(st, head))) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 864 | pos--; |
| 865 | return pos ? NULL : head; |
| 866 | } |
| 867 | |
| 868 | static void *seq_start(struct seq_file *seq, loff_t *pos) |
| 869 | { |
| 870 | read_lock_bh(&instances_lock); |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 871 | return get_idx(seq->private, *pos); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 872 | } |
| 873 | |
| 874 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 875 | { |
| 876 | (*pos)++; |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 877 | return get_next(s->private, v); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 878 | } |
| 879 | |
| 880 | static void seq_stop(struct seq_file *s, void *v) |
| 881 | { |
| 882 | read_unlock_bh(&instances_lock); |
| 883 | } |
| 884 | |
| 885 | static int seq_show(struct seq_file *s, void *v) |
| 886 | { |
| 887 | const struct nfulnl_instance *inst = v; |
| 888 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 889 | return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 890 | inst->group_num, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 891 | inst->peer_pid, inst->qlen, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 892 | inst->copy_mode, inst->copy_range, |
| 893 | inst->flushtimeout, atomic_read(&inst->use)); |
| 894 | } |
| 895 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 896 | static const struct seq_operations nful_seq_ops = { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 897 | .start = seq_start, |
| 898 | .next = seq_next, |
| 899 | .stop = seq_stop, |
| 900 | .show = seq_show, |
| 901 | }; |
| 902 | |
| 903 | static int nful_open(struct inode *inode, struct file *file) |
| 904 | { |
Pavel Emelyanov | e2da591 | 2007-10-10 02:29:58 -0700 | [diff] [blame] | 905 | return seq_open_private(file, &nful_seq_ops, |
| 906 | sizeof(struct iter_state)); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 907 | } |
| 908 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 909 | static const struct file_operations nful_file_ops = { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 910 | .owner = THIS_MODULE, |
| 911 | .open = nful_open, |
| 912 | .read = seq_read, |
| 913 | .llseek = seq_lseek, |
| 914 | .release = seq_release_private, |
| 915 | }; |
| 916 | |
| 917 | #endif /* PROC_FS */ |
| 918 | |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 919 | static int __init nfnetlink_log_init(void) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 920 | { |
| 921 | int i, status = -ENOMEM; |
| 922 | #ifdef CONFIG_PROC_FS |
| 923 | struct proc_dir_entry *proc_nful; |
| 924 | #endif |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 925 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 926 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
| 927 | INIT_HLIST_HEAD(&instance_table[i]); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 928 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 929 | /* it's not really all that important to have a random value, so |
| 930 | * we can do this from the init function, even if there hasn't |
| 931 | * been that much entropy yet */ |
| 932 | get_random_bytes(&hash_init, sizeof(hash_init)); |
| 933 | |
| 934 | netlink_register_notifier(&nfulnl_rtnl_notifier); |
| 935 | status = nfnetlink_subsys_register(&nfulnl_subsys); |
| 936 | if (status < 0) { |
| 937 | printk(KERN_ERR "log: failed to create netlink socket\n"); |
| 938 | goto cleanup_netlink_notifier; |
| 939 | } |
| 940 | |
| 941 | #ifdef CONFIG_PROC_FS |
| 942 | proc_nful = create_proc_entry("nfnetlink_log", 0440, |
| 943 | proc_net_netfilter); |
| 944 | if (!proc_nful) |
| 945 | goto cleanup_subsys; |
| 946 | proc_nful->proc_fops = &nful_file_ops; |
| 947 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 948 | return status; |
| 949 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 950 | #ifdef CONFIG_PROC_FS |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 951 | cleanup_subsys: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 952 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 953 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 954 | cleanup_netlink_notifier: |
| 955 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); |
| 956 | return status; |
| 957 | } |
| 958 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 959 | static void __exit nfnetlink_log_fini(void) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 960 | { |
Patrick McHardy | e92ad99 | 2007-02-12 11:11:55 -0800 | [diff] [blame] | 961 | nf_log_unregister(&nfulnl_logger); |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 962 | #ifdef CONFIG_PROC_FS |
| 963 | remove_proc_entry("nfnetlink_log", proc_net_netfilter); |
| 964 | #endif |
| 965 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
| 966 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 967 | } |
| 968 | |
| 969 | MODULE_DESCRIPTION("netfilter userspace logging"); |
| 970 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); |
| 971 | MODULE_LICENSE("GPL"); |
Harald Welte | f682fae | 2005-08-09 20:20:34 -0700 | [diff] [blame] | 972 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 973 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 974 | module_init(nfnetlink_log_init); |
| 975 | module_exit(nfnetlink_log_fini); |