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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 31 | #include <linux/slab.h> |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 32 | #include <net/sock.h> |
Patrick McHardy | f01ffbd | 2007-12-17 22:38:49 -0800 | [diff] [blame] | 33 | #include <net/netfilter/nf_log.h> |
Patrick McHardy | d9e1500 | 2008-11-18 12:16:52 +0100 | [diff] [blame] | 34 | #include <net/netfilter/nfnetlink_log.h> |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 35 | |
| 36 | #include <asm/atomic.h> |
| 37 | |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 38 | #ifdef CONFIG_BRIDGE_NETFILTER |
| 39 | #include "../bridge/br_private.h" |
| 40 | #endif |
| 41 | |
Holger Eitzenberger | c2db292 | 2006-02-04 02:13:14 -0800 | [diff] [blame] | 42 | #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE |
Eric Leblond | 2c6764b | 2009-02-18 15:29:49 +0100 | [diff] [blame] | 43 | #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 44 | #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ |
Michal Miroslaw | 6b6ec99 | 2007-09-28 14:45:52 -0700 | [diff] [blame] | 45 | #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] | 46 | |
| 47 | #define PRINTR(x, args...) do { if (net_ratelimit()) \ |
| 48 | printk(x, ## args); } while (0); |
| 49 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 50 | struct nfulnl_instance { |
| 51 | struct hlist_node hlist; /* global list of instances */ |
| 52 | spinlock_t lock; |
| 53 | atomic_t use; /* use count */ |
| 54 | |
| 55 | unsigned int qlen; /* number of nlmsgs in skb */ |
| 56 | struct sk_buff *skb; /* pre-allocatd skb */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 57 | struct timer_list timer; |
| 58 | int peer_pid; /* PID of the peer process */ |
| 59 | |
| 60 | /* configurable parameters */ |
| 61 | unsigned int flushtimeout; /* timeout until queue flush */ |
| 62 | unsigned int nlbufsiz; /* netlink buffer allocation size */ |
| 63 | unsigned int qthreshold; /* threshold of the queue */ |
| 64 | u_int32_t copy_range; |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 65 | u_int32_t seq; /* instance-local sequential counter */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 66 | u_int16_t group_num; /* number of this queue */ |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 67 | u_int16_t flags; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 68 | u_int8_t copy_mode; |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 69 | struct rcu_head rcu; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 70 | }; |
| 71 | |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 72 | static DEFINE_SPINLOCK(instances_lock); |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 73 | static atomic_t global_seq; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 74 | |
| 75 | #define INSTANCE_BUCKETS 16 |
| 76 | static struct hlist_head instance_table[INSTANCE_BUCKETS]; |
| 77 | static unsigned int hash_init; |
| 78 | |
| 79 | static inline u_int8_t instance_hashfn(u_int16_t group_num) |
| 80 | { |
| 81 | return ((group_num & 0xff) % INSTANCE_BUCKETS); |
| 82 | } |
| 83 | |
| 84 | static struct nfulnl_instance * |
| 85 | __instance_lookup(u_int16_t group_num) |
| 86 | { |
| 87 | struct hlist_head *head; |
| 88 | struct hlist_node *pos; |
| 89 | struct nfulnl_instance *inst; |
| 90 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 91 | head = &instance_table[instance_hashfn(group_num)]; |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 92 | hlist_for_each_entry_rcu(inst, pos, head, hlist) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 93 | if (inst->group_num == group_num) |
| 94 | return inst; |
| 95 | } |
| 96 | return NULL; |
| 97 | } |
| 98 | |
| 99 | static inline void |
| 100 | instance_get(struct nfulnl_instance *inst) |
| 101 | { |
| 102 | atomic_inc(&inst->use); |
| 103 | } |
| 104 | |
| 105 | static struct nfulnl_instance * |
| 106 | instance_lookup_get(u_int16_t group_num) |
| 107 | { |
| 108 | struct nfulnl_instance *inst; |
| 109 | |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 110 | rcu_read_lock_bh(); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 111 | inst = __instance_lookup(group_num); |
Eric Dumazet | f5c5440 | 2010-06-14 16:15:23 +0200 | [diff] [blame] | 112 | if (inst && !atomic_inc_not_zero(&inst->use)) |
| 113 | inst = NULL; |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 114 | rcu_read_unlock_bh(); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 115 | |
| 116 | return inst; |
| 117 | } |
| 118 | |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 119 | static void nfulnl_instance_free_rcu(struct rcu_head *head) |
| 120 | { |
| 121 | kfree(container_of(head, struct nfulnl_instance, rcu)); |
| 122 | module_put(THIS_MODULE); |
| 123 | } |
| 124 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 125 | static void |
| 126 | instance_put(struct nfulnl_instance *inst) |
| 127 | { |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 128 | if (inst && atomic_dec_and_test(&inst->use)) |
| 129 | call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | static void nfulnl_timer(unsigned long data); |
| 133 | |
| 134 | static struct nfulnl_instance * |
| 135 | instance_create(u_int16_t group_num, int pid) |
| 136 | { |
| 137 | struct nfulnl_instance *inst; |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 138 | int err; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 139 | |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 140 | spin_lock_bh(&instances_lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 141 | if (__instance_lookup(group_num)) { |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 142 | err = -EEXIST; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 143 | goto out_unlock; |
| 144 | } |
| 145 | |
Harald Welte | 10dfdc6 | 2005-11-03 19:20:07 +0100 | [diff] [blame] | 146 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 147 | if (!inst) { |
| 148 | err = -ENOMEM; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 149 | goto out_unlock; |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 150 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 151 | |
Michal Miroslaw | aace57e | 2007-09-28 14:45:27 -0700 | [diff] [blame] | 152 | if (!try_module_get(THIS_MODULE)) { |
| 153 | kfree(inst); |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 154 | err = -EAGAIN; |
Michal Miroslaw | aace57e | 2007-09-28 14:45:27 -0700 | [diff] [blame] | 155 | goto out_unlock; |
| 156 | } |
| 157 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 158 | INIT_HLIST_NODE(&inst->hlist); |
YOSHIFUJI Hideaki | 181a46a | 2006-01-04 13:56:54 -0800 | [diff] [blame] | 159 | spin_lock_init(&inst->lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 160 | /* needs to be two, since we _put() after creation */ |
| 161 | atomic_set(&inst->use, 2); |
| 162 | |
Patrick McHardy | e6f689d | 2007-03-23 11:16:30 -0700 | [diff] [blame] | 163 | setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 164 | |
| 165 | inst->peer_pid = pid; |
| 166 | inst->group_num = group_num; |
| 167 | |
| 168 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; |
| 169 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; |
| 170 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; |
| 171 | inst->copy_mode = NFULNL_COPY_PACKET; |
Michal Miroslaw | 6b6ec99 | 2007-09-28 14:45:52 -0700 | [diff] [blame] | 172 | inst->copy_range = NFULNL_COPY_RANGE_MAX; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 173 | |
Eric Dumazet | f5c5440 | 2010-06-14 16:15:23 +0200 | [diff] [blame] | 174 | hlist_add_head_rcu(&inst->hlist, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 175 | &instance_table[instance_hashfn(group_num)]); |
| 176 | |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 177 | spin_unlock_bh(&instances_lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 178 | |
| 179 | return inst; |
| 180 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 181 | out_unlock: |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 182 | spin_unlock_bh(&instances_lock); |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 183 | return ERR_PTR(err); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 184 | } |
| 185 | |
Michal Miroslaw | e356706 | 2007-09-28 14:44:21 -0700 | [diff] [blame] | 186 | static void __nfulnl_flush(struct nfulnl_instance *inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 187 | |
Eric Dumazet | f5c5440 | 2010-06-14 16:15:23 +0200 | [diff] [blame] | 188 | /* called with BH disabled */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 189 | static void |
Patrick McHardy | 9afdb00 | 2007-03-23 11:12:50 -0700 | [diff] [blame] | 190 | __instance_destroy(struct nfulnl_instance *inst) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 191 | { |
| 192 | /* first pull it out of the global list */ |
Eric Dumazet | f5c5440 | 2010-06-14 16:15:23 +0200 | [diff] [blame] | 193 | hlist_del_rcu(&inst->hlist); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 194 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 195 | /* then flush all pending packets from skb */ |
| 196 | |
Eric Dumazet | f5c5440 | 2010-06-14 16:15:23 +0200 | [diff] [blame] | 197 | spin_lock(&inst->lock); |
| 198 | |
| 199 | /* lockless readers wont be able to use us */ |
| 200 | inst->copy_mode = NFULNL_COPY_DISABLED; |
| 201 | |
Michal Miroslaw | e356706 | 2007-09-28 14:44:21 -0700 | [diff] [blame] | 202 | if (inst->skb) |
| 203 | __nfulnl_flush(inst); |
Eric Dumazet | f5c5440 | 2010-06-14 16:15:23 +0200 | [diff] [blame] | 204 | spin_unlock(&inst->lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 205 | |
| 206 | /* and finally put the refcount */ |
| 207 | instance_put(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 208 | } |
| 209 | |
| 210 | static inline void |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 211 | instance_destroy(struct nfulnl_instance *inst) |
| 212 | { |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 213 | spin_lock_bh(&instances_lock); |
Patrick McHardy | 9afdb00 | 2007-03-23 11:12:50 -0700 | [diff] [blame] | 214 | __instance_destroy(inst); |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 215 | spin_unlock_bh(&instances_lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 216 | } |
| 217 | |
| 218 | static int |
| 219 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, |
| 220 | unsigned int range) |
| 221 | { |
| 222 | int status = 0; |
| 223 | |
| 224 | spin_lock_bh(&inst->lock); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 225 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 226 | switch (mode) { |
| 227 | case NFULNL_COPY_NONE: |
| 228 | case NFULNL_COPY_META: |
| 229 | inst->copy_mode = mode; |
| 230 | inst->copy_range = 0; |
| 231 | break; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 232 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 233 | case NFULNL_COPY_PACKET: |
| 234 | inst->copy_mode = mode; |
Michal Miroslaw | 6b6ec99 | 2007-09-28 14:45:52 -0700 | [diff] [blame] | 235 | inst->copy_range = min_t(unsigned int, |
| 236 | range, NFULNL_COPY_RANGE_MAX); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 237 | break; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 238 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 239 | default: |
| 240 | status = -EINVAL; |
| 241 | break; |
| 242 | } |
| 243 | |
| 244 | spin_unlock_bh(&inst->lock); |
| 245 | |
| 246 | return status; |
| 247 | } |
| 248 | |
| 249 | static int |
| 250 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) |
| 251 | { |
| 252 | int status; |
| 253 | |
| 254 | spin_lock_bh(&inst->lock); |
| 255 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) |
| 256 | status = -ERANGE; |
| 257 | else if (nlbufsiz > 131072) |
| 258 | status = -ERANGE; |
| 259 | else { |
| 260 | inst->nlbufsiz = nlbufsiz; |
| 261 | status = 0; |
| 262 | } |
| 263 | spin_unlock_bh(&inst->lock); |
| 264 | |
| 265 | return status; |
| 266 | } |
| 267 | |
| 268 | static int |
| 269 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) |
| 270 | { |
| 271 | spin_lock_bh(&inst->lock); |
| 272 | inst->flushtimeout = timeout; |
| 273 | spin_unlock_bh(&inst->lock); |
| 274 | |
| 275 | return 0; |
| 276 | } |
| 277 | |
| 278 | static int |
| 279 | nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) |
| 280 | { |
| 281 | spin_lock_bh(&inst->lock); |
| 282 | inst->qthreshold = qthresh; |
| 283 | spin_unlock_bh(&inst->lock); |
| 284 | |
| 285 | return 0; |
| 286 | } |
| 287 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 288 | static int |
| 289 | nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) |
| 290 | { |
| 291 | spin_lock_bh(&inst->lock); |
Patrick McHardy | ee43353 | 2006-05-19 02:17:18 -0700 | [diff] [blame] | 292 | inst->flags = flags; |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 293 | spin_unlock_bh(&inst->lock); |
| 294 | |
| 295 | return 0; |
| 296 | } |
| 297 | |
Michal Miroslaw | c6a8f64 | 2007-09-28 14:45:06 -0700 | [diff] [blame] | 298 | static struct sk_buff * |
| 299 | nfulnl_alloc_skb(unsigned int inst_size, unsigned int pkt_size) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 300 | { |
| 301 | struct sk_buff *skb; |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 302 | unsigned int n; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 303 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 304 | /* alloc skb which should be big enough for a whole multipart |
| 305 | * message. WARNING: has to be <= 128k due to slab restrictions */ |
| 306 | |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 307 | n = max(inst_size, pkt_size); |
| 308 | skb = alloc_skb(n, GFP_ATOMIC); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 309 | if (!skb) { |
Stephen Hemminger | 654d0fb | 2010-05-13 15:02:08 +0200 | [diff] [blame] | 310 | pr_notice("nfnetlink_log: can't alloc whole buffer (%u bytes)\n", |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 311 | inst_size); |
| 312 | |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 313 | if (n > pkt_size) { |
| 314 | /* try to allocate only as much as we need for current |
| 315 | * packet */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 316 | |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 317 | skb = alloc_skb(pkt_size, GFP_ATOMIC); |
| 318 | if (!skb) |
Stephen Hemminger | 654d0fb | 2010-05-13 15:02:08 +0200 | [diff] [blame] | 319 | pr_err("nfnetlink_log: can't even alloc %u " |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 320 | "bytes\n", pkt_size); |
| 321 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 322 | } |
| 323 | |
| 324 | return skb; |
| 325 | } |
| 326 | |
| 327 | static int |
| 328 | __nfulnl_send(struct nfulnl_instance *inst) |
| 329 | { |
Eric Leblond | 29c5d4a | 2007-09-18 13:07:15 -0700 | [diff] [blame] | 330 | int status = -1; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 331 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 332 | if (inst->qlen > 1) |
Eric Leblond | 29c5d4a | 2007-09-18 13:07:15 -0700 | [diff] [blame] | 333 | NLMSG_PUT(inst->skb, 0, 0, |
| 334 | NLMSG_DONE, |
| 335 | sizeof(struct nfgenmsg)); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 336 | |
Alexey Dobriyan | cd8c20b | 2010-01-13 16:02:14 +0100 | [diff] [blame] | 337 | status = nfnetlink_unicast(inst->skb, &init_net, inst->peer_pid, |
| 338 | MSG_DONTWAIT); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 339 | |
| 340 | inst->qlen = 0; |
| 341 | inst->skb = NULL; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 342 | |
Eric Leblond | 29c5d4a | 2007-09-18 13:07:15 -0700 | [diff] [blame] | 343 | nlmsg_failure: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 344 | return status; |
| 345 | } |
| 346 | |
Michal Miroslaw | e356706 | 2007-09-28 14:44:21 -0700 | [diff] [blame] | 347 | static void |
| 348 | __nfulnl_flush(struct nfulnl_instance *inst) |
| 349 | { |
| 350 | /* timer holds a reference */ |
| 351 | if (del_timer(&inst->timer)) |
| 352 | instance_put(inst); |
| 353 | if (inst->skb) |
| 354 | __nfulnl_send(inst); |
| 355 | } |
| 356 | |
Michal Miroslaw | c6a8f64 | 2007-09-28 14:45:06 -0700 | [diff] [blame] | 357 | static void |
| 358 | nfulnl_timer(unsigned long data) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 359 | { |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 360 | struct nfulnl_instance *inst = (struct nfulnl_instance *)data; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 361 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 362 | spin_lock_bh(&inst->lock); |
Michal Miroslaw | 370e6a8 | 2007-03-23 11:12:21 -0700 | [diff] [blame] | 363 | if (inst->skb) |
| 364 | __nfulnl_send(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 365 | spin_unlock_bh(&inst->lock); |
Michal Miroslaw | 05f7b7b | 2007-03-04 15:58:40 -0800 | [diff] [blame] | 366 | instance_put(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 367 | } |
| 368 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 369 | /* This is an inline function, we don't really care about a long |
| 370 | * list of arguments */ |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 371 | static inline int |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 372 | __build_packet_message(struct nfulnl_instance *inst, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 373 | const struct sk_buff *skb, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 374 | unsigned int data_len, |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 375 | u_int8_t pf, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 376 | unsigned int hooknum, |
| 377 | const struct net_device *indev, |
| 378 | const struct net_device *outdev, |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 379 | const char *prefix, unsigned int plen) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 380 | { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 381 | struct nfulnl_msg_packet_hdr pmsg; |
| 382 | struct nlmsghdr *nlh; |
| 383 | struct nfgenmsg *nfmsg; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 384 | sk_buff_data_t old_tail = inst->skb->tail; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 385 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 386 | nlh = NLMSG_PUT(inst->skb, 0, 0, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 387 | NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, |
| 388 | sizeof(struct nfgenmsg)); |
| 389 | nfmsg = NLMSG_DATA(nlh); |
| 390 | nfmsg->nfgen_family = pf; |
| 391 | nfmsg->version = NFNETLINK_V0; |
| 392 | nfmsg->res_id = htons(inst->group_num); |
| 393 | |
Al Viro | febf0a4 | 2006-11-03 00:59:17 -0800 | [diff] [blame] | 394 | pmsg.hw_protocol = skb->protocol; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 395 | pmsg.hook = hooknum; |
| 396 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 397 | NLA_PUT(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 398 | |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 399 | if (prefix) |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 400 | NLA_PUT(inst->skb, NFULA_PREFIX, plen, prefix); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 401 | |
| 402 | if (indev) { |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 403 | #ifndef CONFIG_BRIDGE_NETFILTER |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 404 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_INDEV, |
| 405 | htonl(indev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 406 | #else |
| 407 | if (pf == PF_BRIDGE) { |
| 408 | /* Case 1: outdev is physical input device, we need to |
| 409 | * look for bridge group (when called from |
| 410 | * netfilter_bridge) */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 411 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
| 412 | htonl(indev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 413 | /* this is the bridge group "brX" */ |
Jiri Pirko | f350a0a | 2010-06-15 06:50:45 +0000 | [diff] [blame] | 414 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 415 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_INDEV, |
Jiri Pirko | f350a0a | 2010-06-15 06:50:45 +0000 | [diff] [blame] | 416 | htonl(br_port_get_rcu(indev)->br->dev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 417 | } else { |
| 418 | /* Case 2: indev is bridge group, we need to look for |
| 419 | * physical device (when called from ipv4) */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 420 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_INDEV, |
| 421 | htonl(indev->ifindex)); |
| 422 | if (skb->nf_bridge && skb->nf_bridge->physindev) |
| 423 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
| 424 | htonl(skb->nf_bridge->physindev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 425 | } |
| 426 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 427 | } |
| 428 | |
| 429 | if (outdev) { |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 430 | #ifndef CONFIG_BRIDGE_NETFILTER |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 431 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_OUTDEV, |
| 432 | htonl(outdev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 433 | #else |
| 434 | if (pf == PF_BRIDGE) { |
| 435 | /* Case 1: outdev is physical output device, we need to |
| 436 | * look for bridge group (when called from |
| 437 | * netfilter_bridge) */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 438 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
| 439 | htonl(outdev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 440 | /* this is the bridge group "brX" */ |
Jiri Pirko | f350a0a | 2010-06-15 06:50:45 +0000 | [diff] [blame] | 441 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 442 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_OUTDEV, |
Jiri Pirko | f350a0a | 2010-06-15 06:50:45 +0000 | [diff] [blame] | 443 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 444 | } else { |
| 445 | /* Case 2: indev is a bridge group, we need to look |
| 446 | * for physical device (when called from ipv4) */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 447 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_OUTDEV, |
| 448 | htonl(outdev->ifindex)); |
| 449 | if (skb->nf_bridge && skb->nf_bridge->physoutdev) |
| 450 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
| 451 | htonl(skb->nf_bridge->physoutdev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 452 | } |
| 453 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 454 | } |
| 455 | |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 456 | if (skb->mark) |
| 457 | NLA_PUT_BE32(inst->skb, NFULA_MARK, htonl(skb->mark)); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 458 | |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 459 | if (indev && skb->dev) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 460 | struct nfulnl_msg_packet_hw phw; |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 461 | int len = dev_parse_header(skb, phw.hw_addr); |
| 462 | if (len > 0) { |
| 463 | phw.hw_addrlen = htons(len); |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 464 | NLA_PUT(inst->skb, NFULA_HWADDR, sizeof(phw), &phw); |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 465 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 466 | } |
| 467 | |
Eric Leblond | 72961ec | 2008-07-21 10:02:35 -0700 | [diff] [blame] | 468 | if (indev && skb_mac_header_was_set(skb)) { |
| 469 | NLA_PUT_BE16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)); |
| 470 | NLA_PUT_BE16(inst->skb, NFULA_HWLEN, |
| 471 | htons(skb->dev->hard_header_len)); |
| 472 | NLA_PUT(inst->skb, NFULA_HWHEADER, skb->dev->hard_header_len, |
| 473 | skb_mac_header(skb)); |
| 474 | } |
| 475 | |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 476 | if (skb->tstamp.tv64) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 477 | struct nfulnl_msg_packet_timestamp ts; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 478 | struct timeval tv = ktime_to_timeval(skb->tstamp); |
| 479 | ts.sec = cpu_to_be64(tv.tv_sec); |
| 480 | ts.usec = cpu_to_be64(tv.tv_usec); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 481 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 482 | NLA_PUT(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 483 | } |
| 484 | |
| 485 | /* UID */ |
| 486 | if (skb->sk) { |
| 487 | read_lock_bh(&skb->sk->sk_callback_lock); |
| 488 | if (skb->sk->sk_socket && skb->sk->sk_socket->file) { |
David Howells | d76b0d9 | 2008-11-14 10:39:25 +1100 | [diff] [blame] | 489 | struct file *file = skb->sk->sk_socket->file; |
| 490 | __be32 uid = htonl(file->f_cred->fsuid); |
| 491 | __be32 gid = htonl(file->f_cred->fsgid); |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 492 | /* need to unlock here since NLA_PUT may goto */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 493 | read_unlock_bh(&skb->sk->sk_callback_lock); |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 494 | NLA_PUT_BE32(inst->skb, NFULA_UID, uid); |
Patrick McHardy | 76aa1ce | 2007-12-17 22:41:52 -0800 | [diff] [blame] | 495 | NLA_PUT_BE32(inst->skb, NFULA_GID, gid); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 496 | } else |
| 497 | read_unlock_bh(&skb->sk->sk_callback_lock); |
| 498 | } |
| 499 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 500 | /* local sequence number */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 501 | if (inst->flags & NFULNL_CFG_F_SEQ) |
| 502 | NLA_PUT_BE32(inst->skb, NFULA_SEQ, htonl(inst->seq++)); |
| 503 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 504 | /* global sequence number */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 505 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
| 506 | NLA_PUT_BE32(inst->skb, NFULA_SEQ_GLOBAL, |
| 507 | htonl(atomic_inc_return(&global_seq))); |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 508 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 509 | if (data_len) { |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 510 | struct nlattr *nla; |
| 511 | int size = nla_attr_size(data_len); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 512 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 513 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 514 | printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); |
| 515 | goto nlmsg_failure; |
| 516 | } |
| 517 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 518 | nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); |
| 519 | nla->nla_type = NFULA_PAYLOAD; |
| 520 | nla->nla_len = size; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 521 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 522 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 523 | BUG(); |
| 524 | } |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 525 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 526 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
| 527 | return 0; |
| 528 | |
| 529 | nlmsg_failure: |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 530 | nla_put_failure: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 531 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
| 532 | return -1; |
| 533 | } |
| 534 | |
| 535 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) |
| 536 | |
| 537 | static struct nf_loginfo default_loginfo = { |
| 538 | .type = NF_LOG_TYPE_ULOG, |
| 539 | .u = { |
| 540 | .ulog = { |
| 541 | .copy_len = 0xffff, |
| 542 | .group = 0, |
| 543 | .qthreshold = 1, |
| 544 | }, |
| 545 | }, |
| 546 | }; |
| 547 | |
| 548 | /* log handler for internal netfilter logging api */ |
Eric Leblond | 5f7340e | 2008-11-04 14:21:08 +0100 | [diff] [blame] | 549 | void |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 550 | nfulnl_log_packet(u_int8_t pf, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 551 | unsigned int hooknum, |
| 552 | const struct sk_buff *skb, |
| 553 | const struct net_device *in, |
| 554 | const struct net_device *out, |
| 555 | const struct nf_loginfo *li_user, |
| 556 | const char *prefix) |
| 557 | { |
| 558 | unsigned int size, data_len; |
| 559 | struct nfulnl_instance *inst; |
| 560 | const struct nf_loginfo *li; |
| 561 | unsigned int qthreshold; |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 562 | unsigned int plen; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 563 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 564 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 565 | li = li_user; |
| 566 | else |
| 567 | li = &default_loginfo; |
| 568 | |
| 569 | inst = instance_lookup_get(li->u.ulog.group); |
| 570 | if (!inst) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 571 | return; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 572 | |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 573 | plen = 0; |
| 574 | if (prefix) |
Patrick McHardy | 881dbfe | 2007-03-06 20:24:35 -0800 | [diff] [blame] | 575 | plen = strlen(prefix) + 1; |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 576 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 577 | /* FIXME: do we want to make the size calculation conditional based on |
| 578 | * what is actually present? way more branches and checks, but more |
| 579 | * memory efficient... */ |
Eric Leblond | 7000d38 | 2008-03-10 16:42:04 -0700 | [diff] [blame] | 580 | size = NLMSG_SPACE(sizeof(struct nfgenmsg)) |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 581 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) |
| 582 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
| 583 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 584 | #ifdef CONFIG_BRIDGE_NETFILTER |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 585 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
| 586 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 587 | #endif |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 588 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
| 589 | + nla_total_size(sizeof(u_int32_t)) /* uid */ |
Patrick McHardy | 76aa1ce | 2007-12-17 22:41:52 -0800 | [diff] [blame] | 590 | + nla_total_size(sizeof(u_int32_t)) /* gid */ |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 591 | + nla_total_size(plen) /* prefix */ |
| 592 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) |
| 593 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 594 | |
Pablo Neira Ayuso | eeff9be | 2009-05-27 15:49:11 +0200 | [diff] [blame] | 595 | if (in && skb_mac_header_was_set(skb)) { |
| 596 | size += nla_total_size(skb->dev->hard_header_len) |
| 597 | + nla_total_size(sizeof(u_int16_t)) /* hwtype */ |
| 598 | + nla_total_size(sizeof(u_int16_t)); /* hwlen */ |
| 599 | } |
| 600 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 601 | spin_lock_bh(&inst->lock); |
| 602 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 603 | if (inst->flags & NFULNL_CFG_F_SEQ) |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 604 | size += nla_total_size(sizeof(u_int32_t)); |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 605 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 606 | size += nla_total_size(sizeof(u_int32_t)); |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 607 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 608 | qthreshold = inst->qthreshold; |
| 609 | /* per-rule qthreshold overrides per-instance */ |
Eric Leblond | 5ca431f | 2009-02-18 15:29:23 +0100 | [diff] [blame] | 610 | if (li->u.ulog.qthreshold) |
| 611 | if (qthreshold > li->u.ulog.qthreshold) |
| 612 | qthreshold = li->u.ulog.qthreshold; |
| 613 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 614 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 615 | switch (inst->copy_mode) { |
| 616 | case NFULNL_COPY_META: |
| 617 | case NFULNL_COPY_NONE: |
| 618 | data_len = 0; |
| 619 | break; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 620 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 621 | case NFULNL_COPY_PACKET: |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 622 | if (inst->copy_range == 0 |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 623 | || inst->copy_range > skb->len) |
| 624 | data_len = skb->len; |
| 625 | else |
| 626 | data_len = inst->copy_range; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 627 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 628 | size += nla_total_size(data_len); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 629 | break; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 630 | |
Eric Dumazet | f5c5440 | 2010-06-14 16:15:23 +0200 | [diff] [blame] | 631 | case NFULNL_COPY_DISABLED: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 632 | default: |
Michal Miroslaw | 55b5a91 | 2007-03-23 11:11:05 -0700 | [diff] [blame] | 633 | goto unlock_and_release; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 634 | } |
| 635 | |
Michal Miroslaw | d63b043 | 2007-09-28 14:44:44 -0700 | [diff] [blame] | 636 | if (inst->skb && |
| 637 | size > skb_tailroom(inst->skb) - sizeof(struct nfgenmsg)) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 638 | /* either the queue len is too high or we don't have |
| 639 | * enough room in the skb left. flush to userspace. */ |
Michal Miroslaw | e356706 | 2007-09-28 14:44:21 -0700 | [diff] [blame] | 640 | __nfulnl_flush(inst); |
Michal Miroslaw | 55b5a91 | 2007-03-23 11:11:05 -0700 | [diff] [blame] | 641 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 642 | |
Michal Miroslaw | 55b5a91 | 2007-03-23 11:11:05 -0700 | [diff] [blame] | 643 | if (!inst->skb) { |
| 644 | inst->skb = nfulnl_alloc_skb(inst->nlbufsiz, size); |
| 645 | if (!inst->skb) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 646 | goto alloc_failure; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 647 | } |
| 648 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 649 | inst->qlen++; |
| 650 | |
| 651 | __build_packet_message(inst, skb, data_len, pf, |
Florian Westphal | 8248779 | 2011-02-15 21:59:37 +0100 | [diff] [blame] | 652 | hooknum, in, out, prefix, plen); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 653 | |
Michal Miroslaw | d63b043 | 2007-09-28 14:44:44 -0700 | [diff] [blame] | 654 | if (inst->qlen >= qthreshold) |
| 655 | __nfulnl_flush(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 656 | /* timer_pending always called within inst->lock, so there |
| 657 | * is no chance of a race here */ |
Michal Miroslaw | d63b043 | 2007-09-28 14:44:44 -0700 | [diff] [blame] | 658 | else if (!timer_pending(&inst->timer)) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 659 | instance_get(inst); |
| 660 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); |
| 661 | add_timer(&inst->timer); |
| 662 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 663 | |
Michal Miroslaw | ed32abe | 2007-03-04 15:58:15 -0800 | [diff] [blame] | 664 | unlock_and_release: |
| 665 | spin_unlock_bh(&inst->lock); |
| 666 | instance_put(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 667 | return; |
| 668 | |
| 669 | alloc_failure: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 670 | /* FIXME: statistics */ |
Michal Miroslaw | ed32abe | 2007-03-04 15:58:15 -0800 | [diff] [blame] | 671 | goto unlock_and_release; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 672 | } |
Eric Leblond | 5f7340e | 2008-11-04 14:21:08 +0100 | [diff] [blame] | 673 | EXPORT_SYMBOL_GPL(nfulnl_log_packet); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 674 | |
| 675 | static int |
| 676 | nfulnl_rcv_nl_event(struct notifier_block *this, |
| 677 | unsigned long event, void *ptr) |
| 678 | { |
| 679 | struct netlink_notify *n = ptr; |
| 680 | |
Patrick McHardy | dee5817 | 2009-11-06 17:04:00 +0100 | [diff] [blame] | 681 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 682 | int i; |
| 683 | |
| 684 | /* destroy all instances for this pid */ |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 685 | spin_lock_bh(&instances_lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 686 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
| 687 | struct hlist_node *tmp, *t2; |
| 688 | struct nfulnl_instance *inst; |
| 689 | struct hlist_head *head = &instance_table[i]; |
| 690 | |
| 691 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 692 | if ((net_eq(n->net, &init_net)) && |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 693 | (n->pid == inst->peer_pid)) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 694 | __instance_destroy(inst); |
| 695 | } |
| 696 | } |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 697 | spin_unlock_bh(&instances_lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 698 | } |
| 699 | return NOTIFY_DONE; |
| 700 | } |
| 701 | |
| 702 | static struct notifier_block nfulnl_rtnl_notifier = { |
| 703 | .notifier_call = nfulnl_rcv_nl_event, |
| 704 | }; |
| 705 | |
| 706 | static int |
| 707 | nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, |
Patrick McHardy | 3993832 | 2009-08-25 16:07:58 +0200 | [diff] [blame] | 708 | const struct nlmsghdr *nlh, |
| 709 | const struct nlattr * const nfqa[]) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 710 | { |
| 711 | return -ENOTSUPP; |
| 712 | } |
| 713 | |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 714 | static struct nf_logger nfulnl_logger __read_mostly = { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 715 | .name = "nfnetlink_log", |
| 716 | .logfn = &nfulnl_log_packet, |
| 717 | .me = THIS_MODULE, |
| 718 | }; |
| 719 | |
Patrick McHardy | fd8281a | 2007-09-28 14:39:09 -0700 | [diff] [blame] | 720 | static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { |
| 721 | [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, |
| 722 | [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, |
| 723 | [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, |
| 724 | [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, |
| 725 | [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, |
| 726 | [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 727 | }; |
| 728 | |
| 729 | static int |
| 730 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, |
Patrick McHardy | 3993832 | 2009-08-25 16:07:58 +0200 | [diff] [blame] | 731 | const struct nlmsghdr *nlh, |
| 732 | const struct nlattr * const nfula[]) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 733 | { |
| 734 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 735 | u_int16_t group_num = ntohs(nfmsg->res_id); |
| 736 | struct nfulnl_instance *inst; |
Patrick McHardy | b7047a1 | 2008-03-10 16:44:13 -0700 | [diff] [blame] | 737 | struct nfulnl_msg_config_cmd *cmd = NULL; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 738 | int ret = 0; |
| 739 | |
Patrick McHardy | b7047a1 | 2008-03-10 16:44:13 -0700 | [diff] [blame] | 740 | if (nfula[NFULA_CFG_CMD]) { |
| 741 | u_int8_t pf = nfmsg->nfgen_family; |
| 742 | cmd = nla_data(nfula[NFULA_CFG_CMD]); |
| 743 | |
| 744 | /* Commands without queue context */ |
| 745 | switch (cmd->command) { |
| 746 | case NFULNL_CFG_CMD_PF_BIND: |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 747 | return nf_log_bind_pf(pf, &nfulnl_logger); |
Patrick McHardy | b7047a1 | 2008-03-10 16:44:13 -0700 | [diff] [blame] | 748 | case NFULNL_CFG_CMD_PF_UNBIND: |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 749 | nf_log_unbind_pf(pf); |
Patrick McHardy | b7047a1 | 2008-03-10 16:44:13 -0700 | [diff] [blame] | 750 | return 0; |
| 751 | } |
| 752 | } |
| 753 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 754 | inst = instance_lookup_get(group_num); |
Patrick McHardy | c050636 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 755 | if (inst && inst->peer_pid != NETLINK_CB(skb).pid) { |
| 756 | ret = -EPERM; |
| 757 | goto out_put; |
| 758 | } |
| 759 | |
Patrick McHardy | b7047a1 | 2008-03-10 16:44:13 -0700 | [diff] [blame] | 760 | if (cmd != NULL) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 761 | switch (cmd->command) { |
| 762 | case NFULNL_CFG_CMD_BIND: |
| 763 | if (inst) { |
| 764 | ret = -EBUSY; |
| 765 | goto out_put; |
| 766 | } |
| 767 | |
| 768 | inst = instance_create(group_num, |
| 769 | NETLINK_CB(skb).pid); |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 770 | if (IS_ERR(inst)) { |
| 771 | ret = PTR_ERR(inst); |
Michal Miroslaw | f414c16 | 2007-03-23 11:11:31 -0700 | [diff] [blame] | 772 | goto out; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 773 | } |
| 774 | break; |
| 775 | case NFULNL_CFG_CMD_UNBIND: |
| 776 | if (!inst) { |
| 777 | ret = -ENODEV; |
Michal Miroslaw | f414c16 | 2007-03-23 11:11:31 -0700 | [diff] [blame] | 778 | goto out; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 779 | } |
| 780 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 781 | instance_destroy(inst); |
Alexey Dobriyan | a49c650 | 2010-02-26 17:48:40 +0100 | [diff] [blame] | 782 | goto out_put; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 783 | default: |
Patrick McHardy | cd21f0a | 2007-12-17 22:40:19 -0800 | [diff] [blame] | 784 | ret = -ENOTSUPP; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 785 | break; |
| 786 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 787 | } |
| 788 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 789 | if (nfula[NFULA_CFG_MODE]) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 790 | struct nfulnl_msg_config_mode *params; |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 791 | params = nla_data(nfula[NFULA_CFG_MODE]); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 792 | |
Patrick McHardy | c050636 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 793 | if (!inst) { |
| 794 | ret = -ENODEV; |
| 795 | goto out; |
| 796 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 797 | nfulnl_set_mode(inst, params->copy_mode, |
Al Viro | d1208b9 | 2006-11-03 00:58:41 -0800 | [diff] [blame] | 798 | ntohl(params->copy_range)); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 799 | } |
| 800 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 801 | if (nfula[NFULA_CFG_TIMEOUT]) { |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 802 | __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 803 | |
Patrick McHardy | c050636 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 804 | if (!inst) { |
| 805 | ret = -ENODEV; |
| 806 | goto out; |
| 807 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 808 | nfulnl_set_timeout(inst, ntohl(timeout)); |
| 809 | } |
| 810 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 811 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 812 | __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 813 | |
Patrick McHardy | c050636 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 814 | if (!inst) { |
| 815 | ret = -ENODEV; |
| 816 | goto out; |
| 817 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 818 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); |
| 819 | } |
| 820 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 821 | if (nfula[NFULA_CFG_QTHRESH]) { |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 822 | __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 823 | |
Patrick McHardy | c050636 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 824 | if (!inst) { |
| 825 | ret = -ENODEV; |
| 826 | goto out; |
| 827 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 828 | nfulnl_set_qthresh(inst, ntohl(qthresh)); |
| 829 | } |
| 830 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 831 | if (nfula[NFULA_CFG_FLAGS]) { |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 832 | __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]); |
Patrick McHardy | c050636 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 833 | |
| 834 | if (!inst) { |
| 835 | ret = -ENODEV; |
| 836 | goto out; |
| 837 | } |
Patrick McHardy | ee43353 | 2006-05-19 02:17:18 -0700 | [diff] [blame] | 838 | nfulnl_set_flags(inst, ntohs(flags)); |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 839 | } |
| 840 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 841 | out_put: |
| 842 | instance_put(inst); |
Michal Miroslaw | dd16704 | 2007-03-04 15:59:20 -0800 | [diff] [blame] | 843 | out: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 844 | return ret; |
| 845 | } |
| 846 | |
Patrick McHardy | 7c8d4cb | 2007-09-28 14:15:45 -0700 | [diff] [blame] | 847 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 848 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
Harald Welte | 37d2e7a | 2005-11-14 15:24:59 -0800 | [diff] [blame] | 849 | .attr_count = NFULA_MAX, }, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 850 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
Patrick McHardy | fd8281a | 2007-09-28 14:39:09 -0700 | [diff] [blame] | 851 | .attr_count = NFULA_CFG_MAX, |
| 852 | .policy = nfula_cfg_policy }, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 853 | }; |
| 854 | |
Patrick McHardy | 7c8d4cb | 2007-09-28 14:15:45 -0700 | [diff] [blame] | 855 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 856 | .name = "log", |
| 857 | .subsys_id = NFNL_SUBSYS_ULOG, |
| 858 | .cb_count = NFULNL_MSG_MAX, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 859 | .cb = nfulnl_cb, |
| 860 | }; |
| 861 | |
| 862 | #ifdef CONFIG_PROC_FS |
| 863 | struct iter_state { |
| 864 | unsigned int bucket; |
| 865 | }; |
| 866 | |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 867 | static struct hlist_node *get_first(struct iter_state *st) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 868 | { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 869 | if (!st) |
| 870 | return NULL; |
| 871 | |
| 872 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
| 873 | if (!hlist_empty(&instance_table[st->bucket])) |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 874 | return rcu_dereference_bh(hlist_first_rcu(&instance_table[st->bucket])); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 875 | } |
| 876 | return NULL; |
| 877 | } |
| 878 | |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 879 | 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] | 880 | { |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 881 | h = rcu_dereference_bh(hlist_next_rcu(h)); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 882 | while (!h) { |
| 883 | if (++st->bucket >= INSTANCE_BUCKETS) |
| 884 | return NULL; |
| 885 | |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 886 | h = rcu_dereference_bh(hlist_first_rcu(&instance_table[st->bucket])); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 887 | } |
| 888 | return h; |
| 889 | } |
| 890 | |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 891 | 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] | 892 | { |
| 893 | struct hlist_node *head; |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 894 | head = get_first(st); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 895 | |
| 896 | if (head) |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 897 | while (pos && (head = get_next(st, head))) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 898 | pos--; |
| 899 | return pos ? NULL : head; |
| 900 | } |
| 901 | |
| 902 | static void *seq_start(struct seq_file *seq, loff_t *pos) |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 903 | __acquires(rcu_bh) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 904 | { |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 905 | rcu_read_lock_bh(); |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 906 | return get_idx(seq->private, *pos); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 907 | } |
| 908 | |
| 909 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 910 | { |
| 911 | (*pos)++; |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 912 | return get_next(s->private, v); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 913 | } |
| 914 | |
| 915 | static void seq_stop(struct seq_file *s, void *v) |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 916 | __releases(rcu_bh) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 917 | { |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 918 | rcu_read_unlock_bh(); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 919 | } |
| 920 | |
| 921 | static int seq_show(struct seq_file *s, void *v) |
| 922 | { |
| 923 | const struct nfulnl_instance *inst = v; |
| 924 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 925 | return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 926 | inst->group_num, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 927 | inst->peer_pid, inst->qlen, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 928 | inst->copy_mode, inst->copy_range, |
| 929 | inst->flushtimeout, atomic_read(&inst->use)); |
| 930 | } |
| 931 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 932 | static const struct seq_operations nful_seq_ops = { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 933 | .start = seq_start, |
| 934 | .next = seq_next, |
| 935 | .stop = seq_stop, |
| 936 | .show = seq_show, |
| 937 | }; |
| 938 | |
| 939 | static int nful_open(struct inode *inode, struct file *file) |
| 940 | { |
Pavel Emelyanov | e2da591 | 2007-10-10 02:29:58 -0700 | [diff] [blame] | 941 | return seq_open_private(file, &nful_seq_ops, |
| 942 | sizeof(struct iter_state)); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 943 | } |
| 944 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 945 | static const struct file_operations nful_file_ops = { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 946 | .owner = THIS_MODULE, |
| 947 | .open = nful_open, |
| 948 | .read = seq_read, |
| 949 | .llseek = seq_lseek, |
| 950 | .release = seq_release_private, |
| 951 | }; |
| 952 | |
| 953 | #endif /* PROC_FS */ |
| 954 | |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 955 | static int __init nfnetlink_log_init(void) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 956 | { |
| 957 | int i, status = -ENOMEM; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 958 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 959 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
| 960 | INIT_HLIST_HEAD(&instance_table[i]); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 961 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 962 | /* it's not really all that important to have a random value, so |
| 963 | * we can do this from the init function, even if there hasn't |
| 964 | * been that much entropy yet */ |
| 965 | get_random_bytes(&hash_init, sizeof(hash_init)); |
| 966 | |
| 967 | netlink_register_notifier(&nfulnl_rtnl_notifier); |
| 968 | status = nfnetlink_subsys_register(&nfulnl_subsys); |
| 969 | if (status < 0) { |
| 970 | printk(KERN_ERR "log: failed to create netlink socket\n"); |
| 971 | goto cleanup_netlink_notifier; |
| 972 | } |
| 973 | |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 974 | status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger); |
| 975 | if (status < 0) { |
| 976 | printk(KERN_ERR "log: failed to register logger\n"); |
| 977 | goto cleanup_subsys; |
| 978 | } |
| 979 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 980 | #ifdef CONFIG_PROC_FS |
Denis V. Lunev | 8eeee8b | 2008-03-27 16:55:53 -0700 | [diff] [blame] | 981 | if (!proc_create("nfnetlink_log", 0440, |
| 982 | proc_net_netfilter, &nful_file_ops)) |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 983 | goto cleanup_logger; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 984 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 985 | return status; |
| 986 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 987 | #ifdef CONFIG_PROC_FS |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 988 | cleanup_logger: |
| 989 | nf_log_unregister(&nfulnl_logger); |
| 990 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 991 | cleanup_subsys: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 992 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
| 993 | cleanup_netlink_notifier: |
| 994 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); |
| 995 | return status; |
| 996 | } |
| 997 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 998 | static void __exit nfnetlink_log_fini(void) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 999 | { |
Patrick McHardy | e92ad99 | 2007-02-12 11:11:55 -0800 | [diff] [blame] | 1000 | nf_log_unregister(&nfulnl_logger); |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 1001 | #ifdef CONFIG_PROC_FS |
| 1002 | remove_proc_entry("nfnetlink_log", proc_net_netfilter); |
| 1003 | #endif |
| 1004 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
| 1005 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1006 | } |
| 1007 | |
| 1008 | MODULE_DESCRIPTION("netfilter userspace logging"); |
| 1009 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); |
| 1010 | MODULE_LICENSE("GPL"); |
Harald Welte | f682fae | 2005-08-09 20:20:34 -0700 | [diff] [blame] | 1011 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1012 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1013 | module_init(nfnetlink_log_init); |
| 1014 | module_exit(nfnetlink_log_fini); |