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 | |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 36 | #include <linux/atomic.h> |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 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) { |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 310 | if (n > pkt_size) { |
| 311 | /* try to allocate only as much as we need for current |
| 312 | * packet */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 313 | |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 314 | skb = alloc_skb(pkt_size, GFP_ATOMIC); |
| 315 | if (!skb) |
Joe Perches | 0a9ee81 | 2011-08-29 14:17:25 -0700 | [diff] [blame] | 316 | pr_err("nfnetlink_log: can't even alloc %u bytes\n", |
| 317 | pkt_size); |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 318 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 319 | } |
| 320 | |
| 321 | return skb; |
| 322 | } |
| 323 | |
| 324 | static int |
| 325 | __nfulnl_send(struct nfulnl_instance *inst) |
| 326 | { |
Eric Leblond | 29c5d4a | 2007-09-18 13:07:15 -0700 | [diff] [blame] | 327 | int status = -1; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 328 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 329 | if (inst->qlen > 1) |
Eric Leblond | 29c5d4a | 2007-09-18 13:07:15 -0700 | [diff] [blame] | 330 | NLMSG_PUT(inst->skb, 0, 0, |
| 331 | NLMSG_DONE, |
| 332 | sizeof(struct nfgenmsg)); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 333 | |
Alexey Dobriyan | cd8c20b | 2010-01-13 16:02:14 +0100 | [diff] [blame] | 334 | status = nfnetlink_unicast(inst->skb, &init_net, inst->peer_pid, |
| 335 | MSG_DONTWAIT); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 336 | |
| 337 | inst->qlen = 0; |
| 338 | inst->skb = NULL; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 339 | |
Eric Leblond | 29c5d4a | 2007-09-18 13:07:15 -0700 | [diff] [blame] | 340 | nlmsg_failure: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 341 | return status; |
| 342 | } |
| 343 | |
Michal Miroslaw | e356706 | 2007-09-28 14:44:21 -0700 | [diff] [blame] | 344 | static void |
| 345 | __nfulnl_flush(struct nfulnl_instance *inst) |
| 346 | { |
| 347 | /* timer holds a reference */ |
| 348 | if (del_timer(&inst->timer)) |
| 349 | instance_put(inst); |
| 350 | if (inst->skb) |
| 351 | __nfulnl_send(inst); |
| 352 | } |
| 353 | |
Michal Miroslaw | c6a8f64 | 2007-09-28 14:45:06 -0700 | [diff] [blame] | 354 | static void |
| 355 | nfulnl_timer(unsigned long data) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 356 | { |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 357 | struct nfulnl_instance *inst = (struct nfulnl_instance *)data; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 358 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 359 | spin_lock_bh(&inst->lock); |
Michal Miroslaw | 370e6a8 | 2007-03-23 11:12:21 -0700 | [diff] [blame] | 360 | if (inst->skb) |
| 361 | __nfulnl_send(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 362 | spin_unlock_bh(&inst->lock); |
Michal Miroslaw | 05f7b7b | 2007-03-04 15:58:40 -0800 | [diff] [blame] | 363 | instance_put(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 364 | } |
| 365 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 366 | /* This is an inline function, we don't really care about a long |
| 367 | * list of arguments */ |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 368 | static inline int |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 369 | __build_packet_message(struct nfulnl_instance *inst, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 370 | const struct sk_buff *skb, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 371 | unsigned int data_len, |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 372 | u_int8_t pf, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 373 | unsigned int hooknum, |
| 374 | const struct net_device *indev, |
| 375 | const struct net_device *outdev, |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 376 | const char *prefix, unsigned int plen) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 377 | { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 378 | struct nfulnl_msg_packet_hdr pmsg; |
| 379 | struct nlmsghdr *nlh; |
| 380 | struct nfgenmsg *nfmsg; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 381 | sk_buff_data_t old_tail = inst->skb->tail; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 382 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 383 | nlh = NLMSG_PUT(inst->skb, 0, 0, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 384 | NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, |
| 385 | sizeof(struct nfgenmsg)); |
| 386 | nfmsg = NLMSG_DATA(nlh); |
| 387 | nfmsg->nfgen_family = pf; |
| 388 | nfmsg->version = NFNETLINK_V0; |
| 389 | nfmsg->res_id = htons(inst->group_num); |
| 390 | |
Al Viro | febf0a4 | 2006-11-03 00:59:17 -0800 | [diff] [blame] | 391 | pmsg.hw_protocol = skb->protocol; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 392 | pmsg.hook = hooknum; |
| 393 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 394 | NLA_PUT(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 395 | |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 396 | if (prefix) |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 397 | NLA_PUT(inst->skb, NFULA_PREFIX, plen, prefix); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 398 | |
| 399 | if (indev) { |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 400 | #ifndef CONFIG_BRIDGE_NETFILTER |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 401 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_INDEV, |
| 402 | htonl(indev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 403 | #else |
| 404 | if (pf == PF_BRIDGE) { |
| 405 | /* Case 1: outdev is physical input device, we need to |
| 406 | * look for bridge group (when called from |
| 407 | * netfilter_bridge) */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 408 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
| 409 | htonl(indev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 410 | /* this is the bridge group "brX" */ |
Jiri Pirko | f350a0a8 | 2010-06-15 06:50:45 +0000 | [diff] [blame] | 411 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 412 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_INDEV, |
Jiri Pirko | f350a0a8 | 2010-06-15 06:50:45 +0000 | [diff] [blame] | 413 | htonl(br_port_get_rcu(indev)->br->dev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 414 | } else { |
| 415 | /* Case 2: indev is bridge group, we need to look for |
| 416 | * physical device (when called from ipv4) */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 417 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_INDEV, |
| 418 | htonl(indev->ifindex)); |
| 419 | if (skb->nf_bridge && skb->nf_bridge->physindev) |
| 420 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
| 421 | htonl(skb->nf_bridge->physindev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 422 | } |
| 423 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 424 | } |
| 425 | |
| 426 | if (outdev) { |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 427 | #ifndef CONFIG_BRIDGE_NETFILTER |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 428 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_OUTDEV, |
| 429 | htonl(outdev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 430 | #else |
| 431 | if (pf == PF_BRIDGE) { |
| 432 | /* Case 1: outdev is physical output device, we need to |
| 433 | * look for bridge group (when called from |
| 434 | * netfilter_bridge) */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 435 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
| 436 | htonl(outdev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 437 | /* this is the bridge group "brX" */ |
Jiri Pirko | f350a0a8 | 2010-06-15 06:50:45 +0000 | [diff] [blame] | 438 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 439 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_OUTDEV, |
Jiri Pirko | f350a0a8 | 2010-06-15 06:50:45 +0000 | [diff] [blame] | 440 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 441 | } else { |
| 442 | /* Case 2: indev is a bridge group, we need to look |
| 443 | * for physical device (when called from ipv4) */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 444 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_OUTDEV, |
| 445 | htonl(outdev->ifindex)); |
| 446 | if (skb->nf_bridge && skb->nf_bridge->physoutdev) |
| 447 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
| 448 | htonl(skb->nf_bridge->physoutdev->ifindex)); |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 449 | } |
| 450 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 451 | } |
| 452 | |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 453 | if (skb->mark) |
| 454 | NLA_PUT_BE32(inst->skb, NFULA_MARK, htonl(skb->mark)); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 455 | |
Nicolas Cavallari | 2c38de4 | 2011-06-16 17:27:04 +0200 | [diff] [blame] | 456 | if (indev && skb->dev && |
| 457 | skb->mac_header != skb->network_header) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 458 | struct nfulnl_msg_packet_hw phw; |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 459 | int len = dev_parse_header(skb, phw.hw_addr); |
| 460 | if (len > 0) { |
| 461 | phw.hw_addrlen = htons(len); |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 462 | NLA_PUT(inst->skb, NFULA_HWADDR, sizeof(phw), &phw); |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 463 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 464 | } |
| 465 | |
Eric Leblond | 72961ec | 2008-07-21 10:02:35 -0700 | [diff] [blame] | 466 | if (indev && skb_mac_header_was_set(skb)) { |
| 467 | NLA_PUT_BE16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)); |
| 468 | NLA_PUT_BE16(inst->skb, NFULA_HWLEN, |
| 469 | htons(skb->dev->hard_header_len)); |
| 470 | NLA_PUT(inst->skb, NFULA_HWHEADER, skb->dev->hard_header_len, |
| 471 | skb_mac_header(skb)); |
| 472 | } |
| 473 | |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 474 | if (skb->tstamp.tv64) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 475 | struct nfulnl_msg_packet_timestamp ts; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 476 | struct timeval tv = ktime_to_timeval(skb->tstamp); |
| 477 | ts.sec = cpu_to_be64(tv.tv_sec); |
| 478 | ts.usec = cpu_to_be64(tv.tv_usec); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 479 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 480 | NLA_PUT(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 481 | } |
| 482 | |
| 483 | /* UID */ |
| 484 | if (skb->sk) { |
| 485 | read_lock_bh(&skb->sk->sk_callback_lock); |
| 486 | if (skb->sk->sk_socket && skb->sk->sk_socket->file) { |
David Howells | d76b0d9 | 2008-11-14 10:39:25 +1100 | [diff] [blame] | 487 | struct file *file = skb->sk->sk_socket->file; |
| 488 | __be32 uid = htonl(file->f_cred->fsuid); |
| 489 | __be32 gid = htonl(file->f_cred->fsgid); |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 490 | /* need to unlock here since NLA_PUT may goto */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 491 | read_unlock_bh(&skb->sk->sk_callback_lock); |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 492 | NLA_PUT_BE32(inst->skb, NFULA_UID, uid); |
Patrick McHardy | 76aa1ce | 2007-12-17 22:41:52 -0800 | [diff] [blame] | 493 | NLA_PUT_BE32(inst->skb, NFULA_GID, gid); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 494 | } else |
| 495 | read_unlock_bh(&skb->sk->sk_callback_lock); |
| 496 | } |
| 497 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 498 | /* local sequence number */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 499 | if (inst->flags & NFULNL_CFG_F_SEQ) |
| 500 | NLA_PUT_BE32(inst->skb, NFULA_SEQ, htonl(inst->seq++)); |
| 501 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 502 | /* global sequence number */ |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 503 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
| 504 | NLA_PUT_BE32(inst->skb, NFULA_SEQ_GLOBAL, |
| 505 | htonl(atomic_inc_return(&global_seq))); |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 506 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 507 | if (data_len) { |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 508 | struct nlattr *nla; |
| 509 | int size = nla_attr_size(data_len); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 510 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 511 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 512 | printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); |
| 513 | goto nlmsg_failure; |
| 514 | } |
| 515 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 516 | nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); |
| 517 | nla->nla_type = NFULA_PAYLOAD; |
| 518 | nla->nla_len = size; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 519 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 520 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 521 | BUG(); |
| 522 | } |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 523 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 524 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
| 525 | return 0; |
| 526 | |
| 527 | nlmsg_failure: |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 528 | nla_put_failure: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 529 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
| 530 | return -1; |
| 531 | } |
| 532 | |
| 533 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) |
| 534 | |
| 535 | static struct nf_loginfo default_loginfo = { |
| 536 | .type = NF_LOG_TYPE_ULOG, |
| 537 | .u = { |
| 538 | .ulog = { |
| 539 | .copy_len = 0xffff, |
| 540 | .group = 0, |
| 541 | .qthreshold = 1, |
| 542 | }, |
| 543 | }, |
| 544 | }; |
| 545 | |
| 546 | /* log handler for internal netfilter logging api */ |
Eric Leblond | 5f7340e | 2008-11-04 14:21:08 +0100 | [diff] [blame] | 547 | void |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 548 | nfulnl_log_packet(u_int8_t pf, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 549 | unsigned int hooknum, |
| 550 | const struct sk_buff *skb, |
| 551 | const struct net_device *in, |
| 552 | const struct net_device *out, |
| 553 | const struct nf_loginfo *li_user, |
| 554 | const char *prefix) |
| 555 | { |
| 556 | unsigned int size, data_len; |
| 557 | struct nfulnl_instance *inst; |
| 558 | const struct nf_loginfo *li; |
| 559 | unsigned int qthreshold; |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 560 | unsigned int plen; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 561 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 562 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 563 | li = li_user; |
| 564 | else |
| 565 | li = &default_loginfo; |
| 566 | |
| 567 | inst = instance_lookup_get(li->u.ulog.group); |
| 568 | if (!inst) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 569 | return; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 570 | |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 571 | plen = 0; |
| 572 | if (prefix) |
Patrick McHardy | 881dbfe | 2007-03-06 20:24:35 -0800 | [diff] [blame] | 573 | plen = strlen(prefix) + 1; |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 574 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 575 | /* FIXME: do we want to make the size calculation conditional based on |
| 576 | * what is actually present? way more branches and checks, but more |
| 577 | * memory efficient... */ |
Eric Leblond | 7000d38 | 2008-03-10 16:42:04 -0700 | [diff] [blame] | 578 | size = NLMSG_SPACE(sizeof(struct nfgenmsg)) |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 579 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) |
| 580 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
| 581 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 582 | #ifdef CONFIG_BRIDGE_NETFILTER |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 583 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
| 584 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 585 | #endif |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 586 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
| 587 | + nla_total_size(sizeof(u_int32_t)) /* uid */ |
Patrick McHardy | 76aa1ce | 2007-12-17 22:41:52 -0800 | [diff] [blame] | 588 | + nla_total_size(sizeof(u_int32_t)) /* gid */ |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 589 | + nla_total_size(plen) /* prefix */ |
| 590 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) |
| 591 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 592 | |
Pablo Neira Ayuso | eeff9be | 2009-05-27 15:49:11 +0200 | [diff] [blame] | 593 | if (in && skb_mac_header_was_set(skb)) { |
| 594 | size += nla_total_size(skb->dev->hard_header_len) |
| 595 | + nla_total_size(sizeof(u_int16_t)) /* hwtype */ |
| 596 | + nla_total_size(sizeof(u_int16_t)); /* hwlen */ |
| 597 | } |
| 598 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 599 | spin_lock_bh(&inst->lock); |
| 600 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 601 | if (inst->flags & NFULNL_CFG_F_SEQ) |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 602 | size += nla_total_size(sizeof(u_int32_t)); |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 603 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
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 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 606 | qthreshold = inst->qthreshold; |
| 607 | /* per-rule qthreshold overrides per-instance */ |
Eric Leblond | 5ca431f | 2009-02-18 15:29:23 +0100 | [diff] [blame] | 608 | if (li->u.ulog.qthreshold) |
| 609 | if (qthreshold > li->u.ulog.qthreshold) |
| 610 | qthreshold = li->u.ulog.qthreshold; |
| 611 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 612 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 613 | switch (inst->copy_mode) { |
| 614 | case NFULNL_COPY_META: |
| 615 | case NFULNL_COPY_NONE: |
| 616 | data_len = 0; |
| 617 | break; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 618 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 619 | case NFULNL_COPY_PACKET: |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 620 | if (inst->copy_range == 0 |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 621 | || inst->copy_range > skb->len) |
| 622 | data_len = skb->len; |
| 623 | else |
| 624 | data_len = inst->copy_range; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 625 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 626 | size += nla_total_size(data_len); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 627 | break; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 628 | |
Eric Dumazet | f5c5440 | 2010-06-14 16:15:23 +0200 | [diff] [blame] | 629 | case NFULNL_COPY_DISABLED: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 630 | default: |
Michal Miroslaw | 55b5a91 | 2007-03-23 11:11:05 -0700 | [diff] [blame] | 631 | goto unlock_and_release; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 632 | } |
| 633 | |
Michal Miroslaw | d63b043 | 2007-09-28 14:44:44 -0700 | [diff] [blame] | 634 | if (inst->skb && |
| 635 | size > skb_tailroom(inst->skb) - sizeof(struct nfgenmsg)) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 636 | /* either the queue len is too high or we don't have |
| 637 | * enough room in the skb left. flush to userspace. */ |
Michal Miroslaw | e356706 | 2007-09-28 14:44:21 -0700 | [diff] [blame] | 638 | __nfulnl_flush(inst); |
Michal Miroslaw | 55b5a91 | 2007-03-23 11:11:05 -0700 | [diff] [blame] | 639 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 640 | |
Michal Miroslaw | 55b5a91 | 2007-03-23 11:11:05 -0700 | [diff] [blame] | 641 | if (!inst->skb) { |
| 642 | inst->skb = nfulnl_alloc_skb(inst->nlbufsiz, size); |
| 643 | if (!inst->skb) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 644 | goto alloc_failure; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 645 | } |
| 646 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 647 | inst->qlen++; |
| 648 | |
| 649 | __build_packet_message(inst, skb, data_len, pf, |
Florian Westphal | 8248779 | 2011-02-15 21:59:37 +0100 | [diff] [blame] | 650 | hooknum, in, out, prefix, plen); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 651 | |
Michal Miroslaw | d63b043 | 2007-09-28 14:44:44 -0700 | [diff] [blame] | 652 | if (inst->qlen >= qthreshold) |
| 653 | __nfulnl_flush(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 654 | /* timer_pending always called within inst->lock, so there |
| 655 | * is no chance of a race here */ |
Michal Miroslaw | d63b043 | 2007-09-28 14:44:44 -0700 | [diff] [blame] | 656 | else if (!timer_pending(&inst->timer)) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 657 | instance_get(inst); |
| 658 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); |
| 659 | add_timer(&inst->timer); |
| 660 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 661 | |
Michal Miroslaw | ed32abe | 2007-03-04 15:58:15 -0800 | [diff] [blame] | 662 | unlock_and_release: |
| 663 | spin_unlock_bh(&inst->lock); |
| 664 | instance_put(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 665 | return; |
| 666 | |
| 667 | alloc_failure: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 668 | /* FIXME: statistics */ |
Michal Miroslaw | ed32abe | 2007-03-04 15:58:15 -0800 | [diff] [blame] | 669 | goto unlock_and_release; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 670 | } |
Eric Leblond | 5f7340e | 2008-11-04 14:21:08 +0100 | [diff] [blame] | 671 | EXPORT_SYMBOL_GPL(nfulnl_log_packet); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 672 | |
| 673 | static int |
| 674 | nfulnl_rcv_nl_event(struct notifier_block *this, |
| 675 | unsigned long event, void *ptr) |
| 676 | { |
| 677 | struct netlink_notify *n = ptr; |
| 678 | |
Patrick McHardy | dee5817 | 2009-11-06 17:04:00 +0100 | [diff] [blame] | 679 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 680 | int i; |
| 681 | |
| 682 | /* destroy all instances for this pid */ |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 683 | spin_lock_bh(&instances_lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 684 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
| 685 | struct hlist_node *tmp, *t2; |
| 686 | struct nfulnl_instance *inst; |
| 687 | struct hlist_head *head = &instance_table[i]; |
| 688 | |
| 689 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 690 | if ((net_eq(n->net, &init_net)) && |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 691 | (n->pid == inst->peer_pid)) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 692 | __instance_destroy(inst); |
| 693 | } |
| 694 | } |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 695 | spin_unlock_bh(&instances_lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 696 | } |
| 697 | return NOTIFY_DONE; |
| 698 | } |
| 699 | |
| 700 | static struct notifier_block nfulnl_rtnl_notifier = { |
| 701 | .notifier_call = nfulnl_rcv_nl_event, |
| 702 | }; |
| 703 | |
| 704 | static int |
| 705 | nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, |
Patrick McHardy | 3993832 | 2009-08-25 16:07:58 +0200 | [diff] [blame] | 706 | const struct nlmsghdr *nlh, |
| 707 | const struct nlattr * const nfqa[]) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 708 | { |
| 709 | return -ENOTSUPP; |
| 710 | } |
| 711 | |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 712 | static struct nf_logger nfulnl_logger __read_mostly = { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 713 | .name = "nfnetlink_log", |
| 714 | .logfn = &nfulnl_log_packet, |
| 715 | .me = THIS_MODULE, |
| 716 | }; |
| 717 | |
Patrick McHardy | fd8281a | 2007-09-28 14:39:09 -0700 | [diff] [blame] | 718 | static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { |
| 719 | [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, |
| 720 | [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, |
| 721 | [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, |
| 722 | [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, |
| 723 | [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, |
| 724 | [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 725 | }; |
| 726 | |
| 727 | static int |
| 728 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, |
Patrick McHardy | 3993832 | 2009-08-25 16:07:58 +0200 | [diff] [blame] | 729 | const struct nlmsghdr *nlh, |
| 730 | const struct nlattr * const nfula[]) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 731 | { |
| 732 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 733 | u_int16_t group_num = ntohs(nfmsg->res_id); |
| 734 | struct nfulnl_instance *inst; |
Patrick McHardy | b7047a1 | 2008-03-10 16:44:13 -0700 | [diff] [blame] | 735 | struct nfulnl_msg_config_cmd *cmd = NULL; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 736 | int ret = 0; |
| 737 | |
Patrick McHardy | b7047a1 | 2008-03-10 16:44:13 -0700 | [diff] [blame] | 738 | if (nfula[NFULA_CFG_CMD]) { |
| 739 | u_int8_t pf = nfmsg->nfgen_family; |
| 740 | cmd = nla_data(nfula[NFULA_CFG_CMD]); |
| 741 | |
| 742 | /* Commands without queue context */ |
| 743 | switch (cmd->command) { |
| 744 | case NFULNL_CFG_CMD_PF_BIND: |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 745 | return nf_log_bind_pf(pf, &nfulnl_logger); |
Patrick McHardy | b7047a1 | 2008-03-10 16:44:13 -0700 | [diff] [blame] | 746 | case NFULNL_CFG_CMD_PF_UNBIND: |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 747 | nf_log_unbind_pf(pf); |
Patrick McHardy | b7047a1 | 2008-03-10 16:44:13 -0700 | [diff] [blame] | 748 | return 0; |
| 749 | } |
| 750 | } |
| 751 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 752 | inst = instance_lookup_get(group_num); |
Patrick McHardy | c0506365 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 753 | if (inst && inst->peer_pid != NETLINK_CB(skb).pid) { |
| 754 | ret = -EPERM; |
| 755 | goto out_put; |
| 756 | } |
| 757 | |
Patrick McHardy | b7047a1 | 2008-03-10 16:44:13 -0700 | [diff] [blame] | 758 | if (cmd != NULL) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 759 | switch (cmd->command) { |
| 760 | case NFULNL_CFG_CMD_BIND: |
| 761 | if (inst) { |
| 762 | ret = -EBUSY; |
| 763 | goto out_put; |
| 764 | } |
| 765 | |
| 766 | inst = instance_create(group_num, |
| 767 | NETLINK_CB(skb).pid); |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 768 | if (IS_ERR(inst)) { |
| 769 | ret = PTR_ERR(inst); |
Michal Miroslaw | f414c16 | 2007-03-23 11:11:31 -0700 | [diff] [blame] | 770 | goto out; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 771 | } |
| 772 | break; |
| 773 | case NFULNL_CFG_CMD_UNBIND: |
| 774 | if (!inst) { |
| 775 | ret = -ENODEV; |
Michal Miroslaw | f414c16 | 2007-03-23 11:11:31 -0700 | [diff] [blame] | 776 | goto out; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 777 | } |
| 778 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 779 | instance_destroy(inst); |
Alexey Dobriyan | a49c650 | 2010-02-26 17:48:40 +0100 | [diff] [blame] | 780 | goto out_put; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 781 | default: |
Patrick McHardy | cd21f0a | 2007-12-17 22:40:19 -0800 | [diff] [blame] | 782 | ret = -ENOTSUPP; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 783 | break; |
| 784 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 785 | } |
| 786 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 787 | if (nfula[NFULA_CFG_MODE]) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 788 | struct nfulnl_msg_config_mode *params; |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 789 | params = nla_data(nfula[NFULA_CFG_MODE]); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 790 | |
Patrick McHardy | c0506365 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 791 | if (!inst) { |
| 792 | ret = -ENODEV; |
| 793 | goto out; |
| 794 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 795 | nfulnl_set_mode(inst, params->copy_mode, |
Al Viro | d1208b9 | 2006-11-03 00:58:41 -0800 | [diff] [blame] | 796 | ntohl(params->copy_range)); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 797 | } |
| 798 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 799 | if (nfula[NFULA_CFG_TIMEOUT]) { |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 800 | __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 801 | |
Patrick McHardy | c0506365 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 802 | if (!inst) { |
| 803 | ret = -ENODEV; |
| 804 | goto out; |
| 805 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 806 | nfulnl_set_timeout(inst, ntohl(timeout)); |
| 807 | } |
| 808 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 809 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 810 | __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 811 | |
Patrick McHardy | c0506365 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 812 | if (!inst) { |
| 813 | ret = -ENODEV; |
| 814 | goto out; |
| 815 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 816 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); |
| 817 | } |
| 818 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 819 | if (nfula[NFULA_CFG_QTHRESH]) { |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 820 | __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 821 | |
Patrick McHardy | c0506365 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 822 | if (!inst) { |
| 823 | ret = -ENODEV; |
| 824 | goto out; |
| 825 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 826 | nfulnl_set_qthresh(inst, ntohl(qthresh)); |
| 827 | } |
| 828 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 829 | if (nfula[NFULA_CFG_FLAGS]) { |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 830 | __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]); |
Patrick McHardy | c0506365 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 831 | |
| 832 | if (!inst) { |
| 833 | ret = -ENODEV; |
| 834 | goto out; |
| 835 | } |
Patrick McHardy | ee43353 | 2006-05-19 02:17:18 -0700 | [diff] [blame] | 836 | nfulnl_set_flags(inst, ntohs(flags)); |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 837 | } |
| 838 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 839 | out_put: |
| 840 | instance_put(inst); |
Michal Miroslaw | dd16704 | 2007-03-04 15:59:20 -0800 | [diff] [blame] | 841 | out: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 842 | return ret; |
| 843 | } |
| 844 | |
Patrick McHardy | 7c8d4cb | 2007-09-28 14:15:45 -0700 | [diff] [blame] | 845 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 846 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
Harald Welte | 37d2e7a | 2005-11-14 15:24:59 -0800 | [diff] [blame] | 847 | .attr_count = NFULA_MAX, }, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 848 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
Patrick McHardy | fd8281a | 2007-09-28 14:39:09 -0700 | [diff] [blame] | 849 | .attr_count = NFULA_CFG_MAX, |
| 850 | .policy = nfula_cfg_policy }, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 851 | }; |
| 852 | |
Patrick McHardy | 7c8d4cb | 2007-09-28 14:15:45 -0700 | [diff] [blame] | 853 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 854 | .name = "log", |
| 855 | .subsys_id = NFNL_SUBSYS_ULOG, |
| 856 | .cb_count = NFULNL_MSG_MAX, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 857 | .cb = nfulnl_cb, |
| 858 | }; |
| 859 | |
| 860 | #ifdef CONFIG_PROC_FS |
| 861 | struct iter_state { |
| 862 | unsigned int bucket; |
| 863 | }; |
| 864 | |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 865 | static struct hlist_node *get_first(struct iter_state *st) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 866 | { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 867 | if (!st) |
| 868 | return NULL; |
| 869 | |
| 870 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
| 871 | if (!hlist_empty(&instance_table[st->bucket])) |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 872 | return rcu_dereference_bh(hlist_first_rcu(&instance_table[st->bucket])); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 873 | } |
| 874 | return NULL; |
| 875 | } |
| 876 | |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 877 | 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] | 878 | { |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 879 | h = rcu_dereference_bh(hlist_next_rcu(h)); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 880 | while (!h) { |
| 881 | if (++st->bucket >= INSTANCE_BUCKETS) |
| 882 | return NULL; |
| 883 | |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 884 | h = rcu_dereference_bh(hlist_first_rcu(&instance_table[st->bucket])); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 885 | } |
| 886 | return h; |
| 887 | } |
| 888 | |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 889 | 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] | 890 | { |
| 891 | struct hlist_node *head; |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 892 | head = get_first(st); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 893 | |
| 894 | if (head) |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 895 | while (pos && (head = get_next(st, head))) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 896 | pos--; |
| 897 | return pos ? NULL : head; |
| 898 | } |
| 899 | |
| 900 | static void *seq_start(struct seq_file *seq, loff_t *pos) |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 901 | __acquires(rcu_bh) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 902 | { |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 903 | rcu_read_lock_bh(); |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 904 | return get_idx(seq->private, *pos); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 905 | } |
| 906 | |
| 907 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 908 | { |
| 909 | (*pos)++; |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 910 | return get_next(s->private, v); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 911 | } |
| 912 | |
| 913 | static void seq_stop(struct seq_file *s, void *v) |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 914 | __releases(rcu_bh) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 915 | { |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 916 | rcu_read_unlock_bh(); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 917 | } |
| 918 | |
| 919 | static int seq_show(struct seq_file *s, void *v) |
| 920 | { |
| 921 | const struct nfulnl_instance *inst = v; |
| 922 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 923 | return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 924 | inst->group_num, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 925 | inst->peer_pid, inst->qlen, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 926 | inst->copy_mode, inst->copy_range, |
| 927 | inst->flushtimeout, atomic_read(&inst->use)); |
| 928 | } |
| 929 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 930 | static const struct seq_operations nful_seq_ops = { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 931 | .start = seq_start, |
| 932 | .next = seq_next, |
| 933 | .stop = seq_stop, |
| 934 | .show = seq_show, |
| 935 | }; |
| 936 | |
| 937 | static int nful_open(struct inode *inode, struct file *file) |
| 938 | { |
Pavel Emelyanov | e2da591 | 2007-10-10 02:29:58 -0700 | [diff] [blame] | 939 | return seq_open_private(file, &nful_seq_ops, |
| 940 | sizeof(struct iter_state)); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 941 | } |
| 942 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 943 | static const struct file_operations nful_file_ops = { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 944 | .owner = THIS_MODULE, |
| 945 | .open = nful_open, |
| 946 | .read = seq_read, |
| 947 | .llseek = seq_lseek, |
| 948 | .release = seq_release_private, |
| 949 | }; |
| 950 | |
| 951 | #endif /* PROC_FS */ |
| 952 | |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 953 | static int __init nfnetlink_log_init(void) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 954 | { |
| 955 | int i, status = -ENOMEM; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 956 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 957 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
| 958 | INIT_HLIST_HEAD(&instance_table[i]); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 959 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 960 | /* it's not really all that important to have a random value, so |
| 961 | * we can do this from the init function, even if there hasn't |
| 962 | * been that much entropy yet */ |
| 963 | get_random_bytes(&hash_init, sizeof(hash_init)); |
| 964 | |
| 965 | netlink_register_notifier(&nfulnl_rtnl_notifier); |
| 966 | status = nfnetlink_subsys_register(&nfulnl_subsys); |
| 967 | if (status < 0) { |
| 968 | printk(KERN_ERR "log: failed to create netlink socket\n"); |
| 969 | goto cleanup_netlink_notifier; |
| 970 | } |
| 971 | |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 972 | status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger); |
| 973 | if (status < 0) { |
| 974 | printk(KERN_ERR "log: failed to register logger\n"); |
| 975 | goto cleanup_subsys; |
| 976 | } |
| 977 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 978 | #ifdef CONFIG_PROC_FS |
Denis V. Lunev | 8eeee8b | 2008-03-27 16:55:53 -0700 | [diff] [blame] | 979 | if (!proc_create("nfnetlink_log", 0440, |
| 980 | proc_net_netfilter, &nful_file_ops)) |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 981 | goto cleanup_logger; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 982 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 983 | return status; |
| 984 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 985 | #ifdef CONFIG_PROC_FS |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 986 | cleanup_logger: |
| 987 | nf_log_unregister(&nfulnl_logger); |
| 988 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 989 | cleanup_subsys: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 990 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
| 991 | cleanup_netlink_notifier: |
| 992 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); |
| 993 | return status; |
| 994 | } |
| 995 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 996 | static void __exit nfnetlink_log_fini(void) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 997 | { |
Patrick McHardy | e92ad99 | 2007-02-12 11:11:55 -0800 | [diff] [blame] | 998 | nf_log_unregister(&nfulnl_logger); |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 999 | #ifdef CONFIG_PROC_FS |
| 1000 | remove_proc_entry("nfnetlink_log", proc_net_netfilter); |
| 1001 | #endif |
| 1002 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
| 1003 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1004 | } |
| 1005 | |
| 1006 | MODULE_DESCRIPTION("netfilter userspace logging"); |
| 1007 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); |
| 1008 | MODULE_LICENSE("GPL"); |
Harald Welte | f682fae | 2005-08-09 20:20:34 -0700 | [diff] [blame] | 1009 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1010 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1011 | module_init(nfnetlink_log_init); |
| 1012 | module_exit(nfnetlink_log_fini); |