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> |
Pablo Neira Ayuso | e035edd | 2012-12-17 01:12:00 +0100 | [diff] [blame] | 16 | #include <linux/if_arp.h> |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 17 | #include <linux/init.h> |
| 18 | #include <linux/ip.h> |
| 19 | #include <linux/ipv6.h> |
| 20 | #include <linux/netdevice.h> |
| 21 | #include <linux/netfilter.h> |
| 22 | #include <linux/netlink.h> |
| 23 | #include <linux/netfilter/nfnetlink.h> |
| 24 | #include <linux/netfilter/nfnetlink_log.h> |
| 25 | #include <linux/spinlock.h> |
| 26 | #include <linux/sysctl.h> |
| 27 | #include <linux/proc_fs.h> |
| 28 | #include <linux/security.h> |
| 29 | #include <linux/list.h> |
| 30 | #include <linux/jhash.h> |
| 31 | #include <linux/random.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 32 | #include <linux/slab.h> |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 33 | #include <net/sock.h> |
Patrick McHardy | f01ffbd | 2007-12-17 22:38:49 -0800 | [diff] [blame] | 34 | #include <net/netfilter/nf_log.h> |
Patrick McHardy | d9e1500 | 2008-11-18 12:16:52 +0100 | [diff] [blame] | 35 | #include <net/netfilter/nfnetlink_log.h> |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 36 | |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 37 | #include <linux/atomic.h> |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 38 | |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 39 | #ifdef CONFIG_BRIDGE_NETFILTER |
| 40 | #include "../bridge/br_private.h" |
| 41 | #endif |
| 42 | |
Holger Eitzenberger | c2db292 | 2006-02-04 02:13:14 -0800 | [diff] [blame] | 43 | #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE |
Eric Leblond | 2c6764b | 2009-02-18 15:29:49 +0100 | [diff] [blame] | 44 | #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 45 | #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ |
Michal Miroslaw | 6b6ec99 | 2007-09-28 14:45:52 -0700 | [diff] [blame] | 46 | #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] | 47 | |
| 48 | #define PRINTR(x, args...) do { if (net_ratelimit()) \ |
| 49 | printk(x, ## args); } while (0); |
| 50 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 51 | struct nfulnl_instance { |
| 52 | struct hlist_node hlist; /* global list of instances */ |
| 53 | spinlock_t lock; |
| 54 | atomic_t use; /* use count */ |
| 55 | |
| 56 | unsigned int qlen; /* number of nlmsgs in skb */ |
| 57 | struct sk_buff *skb; /* pre-allocatd skb */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 58 | struct timer_list timer; |
Eric W. Biederman | 9eea951 | 2012-05-25 10:42:54 -0600 | [diff] [blame] | 59 | struct user_namespace *peer_user_ns; /* User namespace of the peer process */ |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 60 | int peer_portid; /* PORTID of the peer process */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 61 | |
| 62 | /* configurable parameters */ |
| 63 | unsigned int flushtimeout; /* timeout until queue flush */ |
| 64 | unsigned int nlbufsiz; /* netlink buffer allocation size */ |
| 65 | unsigned int qthreshold; /* threshold of the queue */ |
| 66 | u_int32_t copy_range; |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 67 | u_int32_t seq; /* instance-local sequential counter */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 68 | u_int16_t group_num; /* number of this queue */ |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 69 | u_int16_t flags; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 70 | u_int8_t copy_mode; |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 71 | struct rcu_head rcu; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 72 | }; |
| 73 | |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 74 | static DEFINE_SPINLOCK(instances_lock); |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 75 | static atomic_t global_seq; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 76 | |
| 77 | #define INSTANCE_BUCKETS 16 |
| 78 | static struct hlist_head instance_table[INSTANCE_BUCKETS]; |
| 79 | static unsigned int hash_init; |
| 80 | |
| 81 | static inline u_int8_t instance_hashfn(u_int16_t group_num) |
| 82 | { |
| 83 | return ((group_num & 0xff) % INSTANCE_BUCKETS); |
| 84 | } |
| 85 | |
| 86 | static struct nfulnl_instance * |
| 87 | __instance_lookup(u_int16_t group_num) |
| 88 | { |
| 89 | struct hlist_head *head; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 90 | struct nfulnl_instance *inst; |
| 91 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 92 | head = &instance_table[instance_hashfn(group_num)]; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 93 | hlist_for_each_entry_rcu(inst, head, hlist) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 94 | if (inst->group_num == group_num) |
| 95 | return inst; |
| 96 | } |
| 97 | return NULL; |
| 98 | } |
| 99 | |
| 100 | static inline void |
| 101 | instance_get(struct nfulnl_instance *inst) |
| 102 | { |
| 103 | atomic_inc(&inst->use); |
| 104 | } |
| 105 | |
| 106 | static struct nfulnl_instance * |
| 107 | instance_lookup_get(u_int16_t group_num) |
| 108 | { |
| 109 | struct nfulnl_instance *inst; |
| 110 | |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 111 | rcu_read_lock_bh(); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 112 | inst = __instance_lookup(group_num); |
Eric Dumazet | f5c5440 | 2010-06-14 16:15:23 +0200 | [diff] [blame] | 113 | if (inst && !atomic_inc_not_zero(&inst->use)) |
| 114 | inst = NULL; |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 115 | rcu_read_unlock_bh(); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 116 | |
| 117 | return inst; |
| 118 | } |
| 119 | |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 120 | static void nfulnl_instance_free_rcu(struct rcu_head *head) |
| 121 | { |
| 122 | kfree(container_of(head, struct nfulnl_instance, rcu)); |
| 123 | module_put(THIS_MODULE); |
| 124 | } |
| 125 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 126 | static void |
| 127 | instance_put(struct nfulnl_instance *inst) |
| 128 | { |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 129 | if (inst && atomic_dec_and_test(&inst->use)) |
| 130 | call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 131 | } |
| 132 | |
| 133 | static void nfulnl_timer(unsigned long data); |
| 134 | |
| 135 | static struct nfulnl_instance * |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 136 | instance_create(u_int16_t group_num, int portid, struct user_namespace *user_ns) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 137 | { |
| 138 | struct nfulnl_instance *inst; |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 139 | int err; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 140 | |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 141 | spin_lock_bh(&instances_lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 142 | if (__instance_lookup(group_num)) { |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 143 | err = -EEXIST; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 144 | goto out_unlock; |
| 145 | } |
| 146 | |
Harald Welte | 10dfdc6 | 2005-11-03 19:20:07 +0100 | [diff] [blame] | 147 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 148 | if (!inst) { |
| 149 | err = -ENOMEM; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 150 | goto out_unlock; |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 151 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 152 | |
Michal Miroslaw | aace57e | 2007-09-28 14:45:27 -0700 | [diff] [blame] | 153 | if (!try_module_get(THIS_MODULE)) { |
| 154 | kfree(inst); |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 155 | err = -EAGAIN; |
Michal Miroslaw | aace57e | 2007-09-28 14:45:27 -0700 | [diff] [blame] | 156 | goto out_unlock; |
| 157 | } |
| 158 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 159 | INIT_HLIST_NODE(&inst->hlist); |
YOSHIFUJI Hideaki | 181a46a | 2006-01-04 13:56:54 -0800 | [diff] [blame] | 160 | spin_lock_init(&inst->lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 161 | /* needs to be two, since we _put() after creation */ |
| 162 | atomic_set(&inst->use, 2); |
| 163 | |
Patrick McHardy | e6f689d | 2007-03-23 11:16:30 -0700 | [diff] [blame] | 164 | setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 165 | |
Eric W. Biederman | 9eea951 | 2012-05-25 10:42:54 -0600 | [diff] [blame] | 166 | inst->peer_user_ns = user_ns; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 167 | inst->peer_portid = portid; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 168 | inst->group_num = group_num; |
| 169 | |
| 170 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; |
| 171 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; |
| 172 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; |
| 173 | inst->copy_mode = NFULNL_COPY_PACKET; |
Michal Miroslaw | 6b6ec99 | 2007-09-28 14:45:52 -0700 | [diff] [blame] | 174 | inst->copy_range = NFULNL_COPY_RANGE_MAX; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 175 | |
Eric Dumazet | f5c5440 | 2010-06-14 16:15:23 +0200 | [diff] [blame] | 176 | hlist_add_head_rcu(&inst->hlist, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 177 | &instance_table[instance_hashfn(group_num)]); |
| 178 | |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 179 | spin_unlock_bh(&instances_lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 180 | |
| 181 | return inst; |
| 182 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 183 | out_unlock: |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 184 | spin_unlock_bh(&instances_lock); |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 185 | return ERR_PTR(err); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 186 | } |
| 187 | |
Michal Miroslaw | e356706 | 2007-09-28 14:44:21 -0700 | [diff] [blame] | 188 | static void __nfulnl_flush(struct nfulnl_instance *inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 189 | |
Eric Dumazet | f5c5440 | 2010-06-14 16:15:23 +0200 | [diff] [blame] | 190 | /* called with BH disabled */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 191 | static void |
Patrick McHardy | 9afdb00 | 2007-03-23 11:12:50 -0700 | [diff] [blame] | 192 | __instance_destroy(struct nfulnl_instance *inst) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 193 | { |
| 194 | /* first pull it out of the global list */ |
Eric Dumazet | f5c5440 | 2010-06-14 16:15:23 +0200 | [diff] [blame] | 195 | hlist_del_rcu(&inst->hlist); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 196 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 197 | /* then flush all pending packets from skb */ |
| 198 | |
Eric Dumazet | f5c5440 | 2010-06-14 16:15:23 +0200 | [diff] [blame] | 199 | spin_lock(&inst->lock); |
| 200 | |
| 201 | /* lockless readers wont be able to use us */ |
| 202 | inst->copy_mode = NFULNL_COPY_DISABLED; |
| 203 | |
Michal Miroslaw | e356706 | 2007-09-28 14:44:21 -0700 | [diff] [blame] | 204 | if (inst->skb) |
| 205 | __nfulnl_flush(inst); |
Eric Dumazet | f5c5440 | 2010-06-14 16:15:23 +0200 | [diff] [blame] | 206 | spin_unlock(&inst->lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 207 | |
| 208 | /* and finally put the refcount */ |
| 209 | instance_put(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 210 | } |
| 211 | |
| 212 | static inline void |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 213 | instance_destroy(struct nfulnl_instance *inst) |
| 214 | { |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 215 | spin_lock_bh(&instances_lock); |
Patrick McHardy | 9afdb00 | 2007-03-23 11:12:50 -0700 | [diff] [blame] | 216 | __instance_destroy(inst); |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 217 | spin_unlock_bh(&instances_lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 218 | } |
| 219 | |
| 220 | static int |
| 221 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, |
| 222 | unsigned int range) |
| 223 | { |
| 224 | int status = 0; |
| 225 | |
| 226 | spin_lock_bh(&inst->lock); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 227 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 228 | switch (mode) { |
| 229 | case NFULNL_COPY_NONE: |
| 230 | case NFULNL_COPY_META: |
| 231 | inst->copy_mode = mode; |
| 232 | inst->copy_range = 0; |
| 233 | break; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 234 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 235 | case NFULNL_COPY_PACKET: |
| 236 | inst->copy_mode = mode; |
Michal Miroslaw | 6b6ec99 | 2007-09-28 14:45:52 -0700 | [diff] [blame] | 237 | inst->copy_range = min_t(unsigned int, |
| 238 | range, NFULNL_COPY_RANGE_MAX); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 239 | break; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 240 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 241 | default: |
| 242 | status = -EINVAL; |
| 243 | break; |
| 244 | } |
| 245 | |
| 246 | spin_unlock_bh(&inst->lock); |
| 247 | |
| 248 | return status; |
| 249 | } |
| 250 | |
| 251 | static int |
| 252 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) |
| 253 | { |
| 254 | int status; |
| 255 | |
| 256 | spin_lock_bh(&inst->lock); |
| 257 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) |
| 258 | status = -ERANGE; |
| 259 | else if (nlbufsiz > 131072) |
| 260 | status = -ERANGE; |
| 261 | else { |
| 262 | inst->nlbufsiz = nlbufsiz; |
| 263 | status = 0; |
| 264 | } |
| 265 | spin_unlock_bh(&inst->lock); |
| 266 | |
| 267 | return status; |
| 268 | } |
| 269 | |
| 270 | static int |
| 271 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) |
| 272 | { |
| 273 | spin_lock_bh(&inst->lock); |
| 274 | inst->flushtimeout = timeout; |
| 275 | spin_unlock_bh(&inst->lock); |
| 276 | |
| 277 | return 0; |
| 278 | } |
| 279 | |
| 280 | static int |
| 281 | nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) |
| 282 | { |
| 283 | spin_lock_bh(&inst->lock); |
| 284 | inst->qthreshold = qthresh; |
| 285 | spin_unlock_bh(&inst->lock); |
| 286 | |
| 287 | return 0; |
| 288 | } |
| 289 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 290 | static int |
| 291 | nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) |
| 292 | { |
| 293 | spin_lock_bh(&inst->lock); |
Patrick McHardy | ee43353 | 2006-05-19 02:17:18 -0700 | [diff] [blame] | 294 | inst->flags = flags; |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 295 | spin_unlock_bh(&inst->lock); |
| 296 | |
| 297 | return 0; |
| 298 | } |
| 299 | |
Michal Miroslaw | c6a8f64 | 2007-09-28 14:45:06 -0700 | [diff] [blame] | 300 | static struct sk_buff * |
| 301 | nfulnl_alloc_skb(unsigned int inst_size, unsigned int pkt_size) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 302 | { |
| 303 | struct sk_buff *skb; |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 304 | unsigned int n; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 305 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 306 | /* alloc skb which should be big enough for a whole multipart |
| 307 | * message. WARNING: has to be <= 128k due to slab restrictions */ |
| 308 | |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 309 | n = max(inst_size, pkt_size); |
| 310 | skb = alloc_skb(n, GFP_ATOMIC); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 311 | if (!skb) { |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 312 | if (n > pkt_size) { |
| 313 | /* try to allocate only as much as we need for current |
| 314 | * packet */ |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 315 | |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 316 | skb = alloc_skb(pkt_size, GFP_ATOMIC); |
| 317 | if (!skb) |
Joe Perches | 0a9ee81 | 2011-08-29 14:17:25 -0700 | [diff] [blame] | 318 | pr_err("nfnetlink_log: can't even alloc %u bytes\n", |
| 319 | pkt_size); |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 320 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 321 | } |
| 322 | |
| 323 | return skb; |
| 324 | } |
| 325 | |
| 326 | static int |
| 327 | __nfulnl_send(struct nfulnl_instance *inst) |
| 328 | { |
Eric Leblond | 29c5d4a | 2007-09-18 13:07:15 -0700 | [diff] [blame] | 329 | int status = -1; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 330 | |
David S. Miller | d550d09 | 2012-06-26 21:34:03 -0700 | [diff] [blame] | 331 | if (inst->qlen > 1) { |
| 332 | struct nlmsghdr *nlh = nlmsg_put(inst->skb, 0, 0, |
| 333 | NLMSG_DONE, |
| 334 | sizeof(struct nfgenmsg), |
| 335 | 0); |
| 336 | if (!nlh) |
| 337 | goto out; |
| 338 | } |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 339 | status = nfnetlink_unicast(inst->skb, &init_net, inst->peer_portid, |
Alexey Dobriyan | cd8c20b | 2010-01-13 16:02:14 +0100 | [diff] [blame] | 340 | MSG_DONTWAIT); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 341 | |
| 342 | inst->qlen = 0; |
| 343 | inst->skb = NULL; |
David S. Miller | d550d09 | 2012-06-26 21:34:03 -0700 | [diff] [blame] | 344 | out: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 345 | return status; |
| 346 | } |
| 347 | |
Michal Miroslaw | e356706 | 2007-09-28 14:44:21 -0700 | [diff] [blame] | 348 | static void |
| 349 | __nfulnl_flush(struct nfulnl_instance *inst) |
| 350 | { |
| 351 | /* timer holds a reference */ |
| 352 | if (del_timer(&inst->timer)) |
| 353 | instance_put(inst); |
| 354 | if (inst->skb) |
| 355 | __nfulnl_send(inst); |
| 356 | } |
| 357 | |
Michal Miroslaw | c6a8f64 | 2007-09-28 14:45:06 -0700 | [diff] [blame] | 358 | static void |
| 359 | nfulnl_timer(unsigned long data) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 360 | { |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 361 | struct nfulnl_instance *inst = (struct nfulnl_instance *)data; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 362 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 363 | spin_lock_bh(&inst->lock); |
Michal Miroslaw | 370e6a8 | 2007-03-23 11:12:21 -0700 | [diff] [blame] | 364 | if (inst->skb) |
| 365 | __nfulnl_send(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 366 | spin_unlock_bh(&inst->lock); |
Michal Miroslaw | 05f7b7b | 2007-03-04 15:58:40 -0800 | [diff] [blame] | 367 | instance_put(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 368 | } |
| 369 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 370 | /* This is an inline function, we don't really care about a long |
| 371 | * list of arguments */ |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 372 | static inline int |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 373 | __build_packet_message(struct nfulnl_instance *inst, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 374 | const struct sk_buff *skb, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 375 | unsigned int data_len, |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 376 | u_int8_t pf, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 377 | unsigned int hooknum, |
| 378 | const struct net_device *indev, |
| 379 | const struct net_device *outdev, |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 380 | const char *prefix, unsigned int plen) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 381 | { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 382 | struct nfulnl_msg_packet_hdr pmsg; |
| 383 | struct nlmsghdr *nlh; |
| 384 | struct nfgenmsg *nfmsg; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 385 | sk_buff_data_t old_tail = inst->skb->tail; |
Eric Dumazet | 0626af3 | 2012-09-04 07:49:03 +0000 | [diff] [blame] | 386 | struct sock *sk; |
Bob Hockney | 0c36b48 | 2012-12-16 19:34:11 +0100 | [diff] [blame] | 387 | const unsigned char *hwhdrp; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 388 | |
David S. Miller | d550d09 | 2012-06-26 21:34:03 -0700 | [diff] [blame] | 389 | nlh = nlmsg_put(inst->skb, 0, 0, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 390 | NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, |
David S. Miller | d550d09 | 2012-06-26 21:34:03 -0700 | [diff] [blame] | 391 | sizeof(struct nfgenmsg), 0); |
| 392 | if (!nlh) |
| 393 | return -1; |
| 394 | nfmsg = nlmsg_data(nlh); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 395 | nfmsg->nfgen_family = pf; |
| 396 | nfmsg->version = NFNETLINK_V0; |
| 397 | nfmsg->res_id = htons(inst->group_num); |
| 398 | |
Al Viro | febf0a4 | 2006-11-03 00:59:17 -0800 | [diff] [blame] | 399 | pmsg.hw_protocol = skb->protocol; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 400 | pmsg.hook = hooknum; |
| 401 | |
David S. Miller | 1db20a5 | 2012-03-29 23:31:16 -0400 | [diff] [blame] | 402 | if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg)) |
| 403 | goto nla_put_failure; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 404 | |
David S. Miller | 1db20a5 | 2012-03-29 23:31:16 -0400 | [diff] [blame] | 405 | if (prefix && |
| 406 | nla_put(inst->skb, NFULA_PREFIX, plen, prefix)) |
| 407 | goto nla_put_failure; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 408 | |
| 409 | if (indev) { |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 410 | #ifndef CONFIG_BRIDGE_NETFILTER |
David S. Miller | 1db20a5 | 2012-03-29 23:31:16 -0400 | [diff] [blame] | 411 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
| 412 | htonl(indev->ifindex))) |
| 413 | goto nla_put_failure; |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 414 | #else |
| 415 | if (pf == PF_BRIDGE) { |
| 416 | /* Case 1: outdev is physical input device, we need to |
| 417 | * look for bridge group (when called from |
| 418 | * netfilter_bridge) */ |
David S. Miller | 1db20a5 | 2012-03-29 23:31:16 -0400 | [diff] [blame] | 419 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
| 420 | htonl(indev->ifindex)) || |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 421 | /* this is the bridge group "brX" */ |
Jiri Pirko | f350a0a8 | 2010-06-15 06:50:45 +0000 | [diff] [blame] | 422 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
David S. Miller | 1db20a5 | 2012-03-29 23:31:16 -0400 | [diff] [blame] | 423 | nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
| 424 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) |
| 425 | goto nla_put_failure; |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 426 | } else { |
| 427 | /* Case 2: indev is bridge group, we need to look for |
| 428 | * physical device (when called from ipv4) */ |
David S. Miller | 1db20a5 | 2012-03-29 23:31:16 -0400 | [diff] [blame] | 429 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
| 430 | htonl(indev->ifindex))) |
| 431 | goto nla_put_failure; |
| 432 | if (skb->nf_bridge && skb->nf_bridge->physindev && |
| 433 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
| 434 | htonl(skb->nf_bridge->physindev->ifindex))) |
| 435 | goto nla_put_failure; |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 436 | } |
| 437 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 438 | } |
| 439 | |
| 440 | if (outdev) { |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 441 | #ifndef CONFIG_BRIDGE_NETFILTER |
David S. Miller | 1db20a5 | 2012-03-29 23:31:16 -0400 | [diff] [blame] | 442 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
| 443 | htonl(outdev->ifindex))) |
| 444 | goto nla_put_failure; |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 445 | #else |
| 446 | if (pf == PF_BRIDGE) { |
| 447 | /* Case 1: outdev is physical output device, we need to |
| 448 | * look for bridge group (when called from |
| 449 | * netfilter_bridge) */ |
David S. Miller | 1db20a5 | 2012-03-29 23:31:16 -0400 | [diff] [blame] | 450 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
| 451 | htonl(outdev->ifindex)) || |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 452 | /* this is the bridge group "brX" */ |
Jiri Pirko | f350a0a8 | 2010-06-15 06:50:45 +0000 | [diff] [blame] | 453 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
David S. Miller | 1db20a5 | 2012-03-29 23:31:16 -0400 | [diff] [blame] | 454 | nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
| 455 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) |
| 456 | goto nla_put_failure; |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 457 | } else { |
| 458 | /* Case 2: indev is a bridge group, we need to look |
| 459 | * for physical device (when called from ipv4) */ |
David S. Miller | 1db20a5 | 2012-03-29 23:31:16 -0400 | [diff] [blame] | 460 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
| 461 | htonl(outdev->ifindex))) |
| 462 | goto nla_put_failure; |
| 463 | if (skb->nf_bridge && skb->nf_bridge->physoutdev && |
| 464 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
| 465 | htonl(skb->nf_bridge->physoutdev->ifindex))) |
| 466 | goto nla_put_failure; |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 467 | } |
| 468 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 469 | } |
| 470 | |
David S. Miller | 1db20a5 | 2012-03-29 23:31:16 -0400 | [diff] [blame] | 471 | if (skb->mark && |
| 472 | nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark))) |
| 473 | goto nla_put_failure; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 474 | |
Nicolas Cavallari | 2c38de4 | 2011-06-16 17:27:04 +0200 | [diff] [blame] | 475 | if (indev && skb->dev && |
| 476 | skb->mac_header != skb->network_header) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 477 | struct nfulnl_msg_packet_hw phw; |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 478 | int len = dev_parse_header(skb, phw.hw_addr); |
| 479 | if (len > 0) { |
| 480 | phw.hw_addrlen = htons(len); |
David S. Miller | 1db20a5 | 2012-03-29 23:31:16 -0400 | [diff] [blame] | 481 | if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw)) |
| 482 | goto nla_put_failure; |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 483 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 484 | } |
| 485 | |
Eric Leblond | 72961ec | 2008-07-21 10:02:35 -0700 | [diff] [blame] | 486 | if (indev && skb_mac_header_was_set(skb)) { |
Patrick McHardy | 2dba62c | 2012-08-19 10:16:08 +0000 | [diff] [blame] | 487 | if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) || |
David S. Miller | 1db20a5 | 2012-03-29 23:31:16 -0400 | [diff] [blame] | 488 | nla_put_be16(inst->skb, NFULA_HWLEN, |
Bob Hockney | 0c36b48 | 2012-12-16 19:34:11 +0100 | [diff] [blame] | 489 | htons(skb->dev->hard_header_len))) |
| 490 | goto nla_put_failure; |
| 491 | |
| 492 | hwhdrp = skb_mac_header(skb); |
| 493 | |
| 494 | if (skb->dev->type == ARPHRD_SIT) |
| 495 | hwhdrp -= ETH_HLEN; |
| 496 | |
| 497 | if (hwhdrp >= skb->head && |
| 498 | nla_put(inst->skb, NFULA_HWHEADER, |
| 499 | skb->dev->hard_header_len, hwhdrp)) |
David S. Miller | 1db20a5 | 2012-03-29 23:31:16 -0400 | [diff] [blame] | 500 | goto nla_put_failure; |
Eric Leblond | 72961ec | 2008-07-21 10:02:35 -0700 | [diff] [blame] | 501 | } |
| 502 | |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 503 | if (skb->tstamp.tv64) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 504 | struct nfulnl_msg_packet_timestamp ts; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 505 | struct timeval tv = ktime_to_timeval(skb->tstamp); |
| 506 | ts.sec = cpu_to_be64(tv.tv_sec); |
| 507 | ts.usec = cpu_to_be64(tv.tv_usec); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 508 | |
David S. Miller | 1db20a5 | 2012-03-29 23:31:16 -0400 | [diff] [blame] | 509 | if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts)) |
| 510 | goto nla_put_failure; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 511 | } |
| 512 | |
| 513 | /* UID */ |
Eric Dumazet | 0626af3 | 2012-09-04 07:49:03 +0000 | [diff] [blame] | 514 | sk = skb->sk; |
| 515 | if (sk && sk->sk_state != TCP_TIME_WAIT) { |
| 516 | read_lock_bh(&sk->sk_callback_lock); |
| 517 | if (sk->sk_socket && sk->sk_socket->file) { |
| 518 | struct file *file = sk->sk_socket->file; |
Linus Torvalds | 437589a | 2012-10-02 11:11:09 -0700 | [diff] [blame] | 519 | const struct cred *cred = file->f_cred; |
| 520 | struct user_namespace *user_ns = inst->peer_user_ns; |
| 521 | __be32 uid = htonl(from_kuid_munged(user_ns, cred->fsuid)); |
| 522 | __be32 gid = htonl(from_kgid_munged(user_ns, cred->fsgid)); |
Eric Dumazet | 0626af3 | 2012-09-04 07:49:03 +0000 | [diff] [blame] | 523 | read_unlock_bh(&sk->sk_callback_lock); |
David S. Miller | 1db20a5 | 2012-03-29 23:31:16 -0400 | [diff] [blame] | 524 | if (nla_put_be32(inst->skb, NFULA_UID, uid) || |
| 525 | nla_put_be32(inst->skb, NFULA_GID, gid)) |
| 526 | goto nla_put_failure; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 527 | } else |
Eric Dumazet | 0626af3 | 2012-09-04 07:49:03 +0000 | [diff] [blame] | 528 | read_unlock_bh(&sk->sk_callback_lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 529 | } |
| 530 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 531 | /* local sequence number */ |
David S. Miller | 1db20a5 | 2012-03-29 23:31:16 -0400 | [diff] [blame] | 532 | if ((inst->flags & NFULNL_CFG_F_SEQ) && |
| 533 | nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++))) |
| 534 | goto nla_put_failure; |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 535 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 536 | /* global sequence number */ |
David S. Miller | 1db20a5 | 2012-03-29 23:31:16 -0400 | [diff] [blame] | 537 | if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) && |
| 538 | nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL, |
| 539 | htonl(atomic_inc_return(&global_seq)))) |
| 540 | goto nla_put_failure; |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 541 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 542 | if (data_len) { |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 543 | struct nlattr *nla; |
| 544 | int size = nla_attr_size(data_len); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 545 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 546 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 547 | printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); |
David S. Miller | d550d09 | 2012-06-26 21:34:03 -0700 | [diff] [blame] | 548 | return -1; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 549 | } |
| 550 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 551 | nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); |
| 552 | nla->nla_type = NFULA_PAYLOAD; |
| 553 | nla->nla_len = size; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 554 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 555 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 556 | BUG(); |
| 557 | } |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 558 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 559 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
| 560 | return 0; |
| 561 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 562 | nla_put_failure: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 563 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
| 564 | return -1; |
| 565 | } |
| 566 | |
| 567 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) |
| 568 | |
| 569 | static struct nf_loginfo default_loginfo = { |
| 570 | .type = NF_LOG_TYPE_ULOG, |
| 571 | .u = { |
| 572 | .ulog = { |
| 573 | .copy_len = 0xffff, |
| 574 | .group = 0, |
| 575 | .qthreshold = 1, |
| 576 | }, |
| 577 | }, |
| 578 | }; |
| 579 | |
| 580 | /* log handler for internal netfilter logging api */ |
Eric Leblond | 5f7340e | 2008-11-04 14:21:08 +0100 | [diff] [blame] | 581 | void |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 582 | nfulnl_log_packet(u_int8_t pf, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 583 | unsigned int hooknum, |
| 584 | const struct sk_buff *skb, |
| 585 | const struct net_device *in, |
| 586 | const struct net_device *out, |
| 587 | const struct nf_loginfo *li_user, |
| 588 | const char *prefix) |
| 589 | { |
| 590 | unsigned int size, data_len; |
| 591 | struct nfulnl_instance *inst; |
| 592 | const struct nf_loginfo *li; |
| 593 | unsigned int qthreshold; |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 594 | unsigned int plen; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 595 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 596 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 597 | li = li_user; |
| 598 | else |
| 599 | li = &default_loginfo; |
| 600 | |
| 601 | inst = instance_lookup_get(li->u.ulog.group); |
| 602 | if (!inst) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 603 | return; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 604 | |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 605 | plen = 0; |
| 606 | if (prefix) |
Patrick McHardy | 881dbfe | 2007-03-06 20:24:35 -0800 | [diff] [blame] | 607 | plen = strlen(prefix) + 1; |
Patrick McHardy | d7a5c32 | 2006-11-29 02:35:34 +0100 | [diff] [blame] | 608 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 609 | /* FIXME: do we want to make the size calculation conditional based on |
| 610 | * what is actually present? way more branches and checks, but more |
| 611 | * memory efficient... */ |
Eric Leblond | 7000d38 | 2008-03-10 16:42:04 -0700 | [diff] [blame] | 612 | size = NLMSG_SPACE(sizeof(struct nfgenmsg)) |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 613 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) |
| 614 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
| 615 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 616 | #ifdef CONFIG_BRIDGE_NETFILTER |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 617 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
| 618 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 619 | #endif |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 620 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
| 621 | + nla_total_size(sizeof(u_int32_t)) /* uid */ |
Patrick McHardy | 76aa1ce | 2007-12-17 22:41:52 -0800 | [diff] [blame] | 622 | + nla_total_size(sizeof(u_int32_t)) /* gid */ |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 623 | + nla_total_size(plen) /* prefix */ |
| 624 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) |
| 625 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 626 | |
Pablo Neira Ayuso | eeff9be | 2009-05-27 15:49:11 +0200 | [diff] [blame] | 627 | if (in && skb_mac_header_was_set(skb)) { |
| 628 | size += nla_total_size(skb->dev->hard_header_len) |
| 629 | + nla_total_size(sizeof(u_int16_t)) /* hwtype */ |
| 630 | + nla_total_size(sizeof(u_int16_t)); /* hwlen */ |
| 631 | } |
| 632 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 633 | spin_lock_bh(&inst->lock); |
| 634 | |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 635 | if (inst->flags & NFULNL_CFG_F_SEQ) |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 636 | size += nla_total_size(sizeof(u_int32_t)); |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 637 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 638 | size += nla_total_size(sizeof(u_int32_t)); |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 639 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 640 | qthreshold = inst->qthreshold; |
| 641 | /* per-rule qthreshold overrides per-instance */ |
Eric Leblond | 5ca431f | 2009-02-18 15:29:23 +0100 | [diff] [blame] | 642 | if (li->u.ulog.qthreshold) |
| 643 | if (qthreshold > li->u.ulog.qthreshold) |
| 644 | qthreshold = li->u.ulog.qthreshold; |
| 645 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 646 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 647 | switch (inst->copy_mode) { |
| 648 | case NFULNL_COPY_META: |
| 649 | case NFULNL_COPY_NONE: |
| 650 | data_len = 0; |
| 651 | break; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 652 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 653 | case NFULNL_COPY_PACKET: |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 654 | if (inst->copy_range == 0 |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 655 | || inst->copy_range > skb->len) |
| 656 | data_len = skb->len; |
| 657 | else |
| 658 | data_len = inst->copy_range; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 659 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 660 | size += nla_total_size(data_len); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 661 | break; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 662 | |
Eric Dumazet | f5c5440 | 2010-06-14 16:15:23 +0200 | [diff] [blame] | 663 | case NFULNL_COPY_DISABLED: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 664 | default: |
Michal Miroslaw | 55b5a91 | 2007-03-23 11:11:05 -0700 | [diff] [blame] | 665 | goto unlock_and_release; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 666 | } |
| 667 | |
Michal Miroslaw | d63b043 | 2007-09-28 14:44:44 -0700 | [diff] [blame] | 668 | if (inst->skb && |
| 669 | size > skb_tailroom(inst->skb) - sizeof(struct nfgenmsg)) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 670 | /* either the queue len is too high or we don't have |
| 671 | * enough room in the skb left. flush to userspace. */ |
Michal Miroslaw | e356706 | 2007-09-28 14:44:21 -0700 | [diff] [blame] | 672 | __nfulnl_flush(inst); |
Michal Miroslaw | 55b5a91 | 2007-03-23 11:11:05 -0700 | [diff] [blame] | 673 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 674 | |
Michal Miroslaw | 55b5a91 | 2007-03-23 11:11:05 -0700 | [diff] [blame] | 675 | if (!inst->skb) { |
| 676 | inst->skb = nfulnl_alloc_skb(inst->nlbufsiz, size); |
| 677 | if (!inst->skb) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 678 | goto alloc_failure; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 679 | } |
| 680 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 681 | inst->qlen++; |
| 682 | |
| 683 | __build_packet_message(inst, skb, data_len, pf, |
Florian Westphal | 8248779 | 2011-02-15 21:59:37 +0100 | [diff] [blame] | 684 | hooknum, in, out, prefix, plen); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 685 | |
Michal Miroslaw | d63b043 | 2007-09-28 14:44:44 -0700 | [diff] [blame] | 686 | if (inst->qlen >= qthreshold) |
| 687 | __nfulnl_flush(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 688 | /* timer_pending always called within inst->lock, so there |
| 689 | * is no chance of a race here */ |
Michal Miroslaw | d63b043 | 2007-09-28 14:44:44 -0700 | [diff] [blame] | 690 | else if (!timer_pending(&inst->timer)) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 691 | instance_get(inst); |
| 692 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); |
| 693 | add_timer(&inst->timer); |
| 694 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 695 | |
Michal Miroslaw | ed32abe | 2007-03-04 15:58:15 -0800 | [diff] [blame] | 696 | unlock_and_release: |
| 697 | spin_unlock_bh(&inst->lock); |
| 698 | instance_put(inst); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 699 | return; |
| 700 | |
| 701 | alloc_failure: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 702 | /* FIXME: statistics */ |
Michal Miroslaw | ed32abe | 2007-03-04 15:58:15 -0800 | [diff] [blame] | 703 | goto unlock_and_release; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 704 | } |
Eric Leblond | 5f7340e | 2008-11-04 14:21:08 +0100 | [diff] [blame] | 705 | EXPORT_SYMBOL_GPL(nfulnl_log_packet); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 706 | |
| 707 | static int |
| 708 | nfulnl_rcv_nl_event(struct notifier_block *this, |
| 709 | unsigned long event, void *ptr) |
| 710 | { |
| 711 | struct netlink_notify *n = ptr; |
| 712 | |
Patrick McHardy | dee5817 | 2009-11-06 17:04:00 +0100 | [diff] [blame] | 713 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 714 | int i; |
| 715 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 716 | /* destroy all instances for this portid */ |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 717 | spin_lock_bh(&instances_lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 718 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 719 | struct hlist_node *t2; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 720 | struct nfulnl_instance *inst; |
| 721 | struct hlist_head *head = &instance_table[i]; |
| 722 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 723 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 724 | if ((net_eq(n->net, &init_net)) && |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 725 | (n->portid == inst->peer_portid)) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 726 | __instance_destroy(inst); |
| 727 | } |
| 728 | } |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 729 | spin_unlock_bh(&instances_lock); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 730 | } |
| 731 | return NOTIFY_DONE; |
| 732 | } |
| 733 | |
| 734 | static struct notifier_block nfulnl_rtnl_notifier = { |
| 735 | .notifier_call = nfulnl_rcv_nl_event, |
| 736 | }; |
| 737 | |
| 738 | static int |
| 739 | nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, |
Patrick McHardy | 3993832 | 2009-08-25 16:07:58 +0200 | [diff] [blame] | 740 | const struct nlmsghdr *nlh, |
| 741 | const struct nlattr * const nfqa[]) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 742 | { |
| 743 | return -ENOTSUPP; |
| 744 | } |
| 745 | |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 746 | static struct nf_logger nfulnl_logger __read_mostly = { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 747 | .name = "nfnetlink_log", |
| 748 | .logfn = &nfulnl_log_packet, |
| 749 | .me = THIS_MODULE, |
| 750 | }; |
| 751 | |
Patrick McHardy | fd8281a | 2007-09-28 14:39:09 -0700 | [diff] [blame] | 752 | static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { |
| 753 | [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, |
| 754 | [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, |
| 755 | [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, |
| 756 | [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, |
| 757 | [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, |
| 758 | [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 759 | }; |
| 760 | |
| 761 | static int |
| 762 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, |
Patrick McHardy | 3993832 | 2009-08-25 16:07:58 +0200 | [diff] [blame] | 763 | const struct nlmsghdr *nlh, |
| 764 | const struct nlattr * const nfula[]) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 765 | { |
David S. Miller | d550d09 | 2012-06-26 21:34:03 -0700 | [diff] [blame] | 766 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 767 | u_int16_t group_num = ntohs(nfmsg->res_id); |
| 768 | struct nfulnl_instance *inst; |
Patrick McHardy | b7047a1 | 2008-03-10 16:44:13 -0700 | [diff] [blame] | 769 | struct nfulnl_msg_config_cmd *cmd = NULL; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 770 | int ret = 0; |
| 771 | |
Patrick McHardy | b7047a1 | 2008-03-10 16:44:13 -0700 | [diff] [blame] | 772 | if (nfula[NFULA_CFG_CMD]) { |
| 773 | u_int8_t pf = nfmsg->nfgen_family; |
| 774 | cmd = nla_data(nfula[NFULA_CFG_CMD]); |
| 775 | |
| 776 | /* Commands without queue context */ |
| 777 | switch (cmd->command) { |
| 778 | case NFULNL_CFG_CMD_PF_BIND: |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 779 | return nf_log_bind_pf(pf, &nfulnl_logger); |
Patrick McHardy | b7047a1 | 2008-03-10 16:44:13 -0700 | [diff] [blame] | 780 | case NFULNL_CFG_CMD_PF_UNBIND: |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 781 | nf_log_unbind_pf(pf); |
Patrick McHardy | b7047a1 | 2008-03-10 16:44:13 -0700 | [diff] [blame] | 782 | return 0; |
| 783 | } |
| 784 | } |
| 785 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 786 | inst = instance_lookup_get(group_num); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 787 | if (inst && inst->peer_portid != NETLINK_CB(skb).portid) { |
Patrick McHardy | c0506365 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 788 | ret = -EPERM; |
| 789 | goto out_put; |
| 790 | } |
| 791 | |
Patrick McHardy | b7047a1 | 2008-03-10 16:44:13 -0700 | [diff] [blame] | 792 | if (cmd != NULL) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 793 | switch (cmd->command) { |
| 794 | case NFULNL_CFG_CMD_BIND: |
| 795 | if (inst) { |
| 796 | ret = -EBUSY; |
| 797 | goto out_put; |
| 798 | } |
| 799 | |
| 800 | inst = instance_create(group_num, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 801 | NETLINK_CB(skb).portid, |
Eric W. Biederman | 9eea951 | 2012-05-25 10:42:54 -0600 | [diff] [blame] | 802 | sk_user_ns(NETLINK_CB(skb).ssk)); |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 803 | if (IS_ERR(inst)) { |
| 804 | ret = PTR_ERR(inst); |
Michal Miroslaw | f414c16 | 2007-03-23 11:11:31 -0700 | [diff] [blame] | 805 | goto out; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 806 | } |
| 807 | break; |
| 808 | case NFULNL_CFG_CMD_UNBIND: |
| 809 | if (!inst) { |
| 810 | ret = -ENODEV; |
Michal Miroslaw | f414c16 | 2007-03-23 11:11:31 -0700 | [diff] [blame] | 811 | goto out; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 812 | } |
| 813 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 814 | instance_destroy(inst); |
Alexey Dobriyan | a49c650 | 2010-02-26 17:48:40 +0100 | [diff] [blame] | 815 | goto out_put; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 816 | default: |
Patrick McHardy | cd21f0a | 2007-12-17 22:40:19 -0800 | [diff] [blame] | 817 | ret = -ENOTSUPP; |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 818 | break; |
| 819 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 820 | } |
| 821 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 822 | if (nfula[NFULA_CFG_MODE]) { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 823 | struct nfulnl_msg_config_mode *params; |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 824 | params = nla_data(nfula[NFULA_CFG_MODE]); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 825 | |
Patrick McHardy | c0506365 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 826 | if (!inst) { |
| 827 | ret = -ENODEV; |
| 828 | goto out; |
| 829 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 830 | nfulnl_set_mode(inst, params->copy_mode, |
Al Viro | d1208b9 | 2006-11-03 00:58:41 -0800 | [diff] [blame] | 831 | ntohl(params->copy_range)); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 832 | } |
| 833 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 834 | if (nfula[NFULA_CFG_TIMEOUT]) { |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 835 | __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 836 | |
Patrick McHardy | c0506365 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 837 | if (!inst) { |
| 838 | ret = -ENODEV; |
| 839 | goto out; |
| 840 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 841 | nfulnl_set_timeout(inst, ntohl(timeout)); |
| 842 | } |
| 843 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 844 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 845 | __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 846 | |
Patrick McHardy | c0506365 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 847 | if (!inst) { |
| 848 | ret = -ENODEV; |
| 849 | goto out; |
| 850 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 851 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); |
| 852 | } |
| 853 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 854 | if (nfula[NFULA_CFG_QTHRESH]) { |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 855 | __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 856 | |
Patrick McHardy | c0506365 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 857 | if (!inst) { |
| 858 | ret = -ENODEV; |
| 859 | goto out; |
| 860 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 861 | nfulnl_set_qthresh(inst, ntohl(qthresh)); |
| 862 | } |
| 863 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 864 | if (nfula[NFULA_CFG_FLAGS]) { |
Patrick McHardy | 0dfedd2 | 2007-12-17 22:41:35 -0800 | [diff] [blame] | 865 | __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]); |
Patrick McHardy | c0506365 | 2007-12-17 22:39:55 -0800 | [diff] [blame] | 866 | |
| 867 | if (!inst) { |
| 868 | ret = -ENODEV; |
| 869 | goto out; |
| 870 | } |
Patrick McHardy | ee43353 | 2006-05-19 02:17:18 -0700 | [diff] [blame] | 871 | nfulnl_set_flags(inst, ntohs(flags)); |
Harald Welte | 0af5f6c | 2006-03-20 17:15:11 -0800 | [diff] [blame] | 872 | } |
| 873 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 874 | out_put: |
| 875 | instance_put(inst); |
Michal Miroslaw | dd16704 | 2007-03-04 15:59:20 -0800 | [diff] [blame] | 876 | out: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 877 | return ret; |
| 878 | } |
| 879 | |
Patrick McHardy | 7c8d4cb | 2007-09-28 14:15:45 -0700 | [diff] [blame] | 880 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 881 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
Harald Welte | 37d2e7a | 2005-11-14 15:24:59 -0800 | [diff] [blame] | 882 | .attr_count = NFULA_MAX, }, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 883 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
Patrick McHardy | fd8281a | 2007-09-28 14:39:09 -0700 | [diff] [blame] | 884 | .attr_count = NFULA_CFG_MAX, |
| 885 | .policy = nfula_cfg_policy }, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 886 | }; |
| 887 | |
Patrick McHardy | 7c8d4cb | 2007-09-28 14:15:45 -0700 | [diff] [blame] | 888 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 889 | .name = "log", |
| 890 | .subsys_id = NFNL_SUBSYS_ULOG, |
| 891 | .cb_count = NFULNL_MSG_MAX, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 892 | .cb = nfulnl_cb, |
| 893 | }; |
| 894 | |
| 895 | #ifdef CONFIG_PROC_FS |
| 896 | struct iter_state { |
| 897 | unsigned int bucket; |
| 898 | }; |
| 899 | |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 900 | static struct hlist_node *get_first(struct iter_state *st) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 901 | { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 902 | if (!st) |
| 903 | return NULL; |
| 904 | |
| 905 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
| 906 | if (!hlist_empty(&instance_table[st->bucket])) |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 907 | return rcu_dereference_bh(hlist_first_rcu(&instance_table[st->bucket])); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 908 | } |
| 909 | return NULL; |
| 910 | } |
| 911 | |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 912 | 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] | 913 | { |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 914 | h = rcu_dereference_bh(hlist_next_rcu(h)); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 915 | while (!h) { |
| 916 | if (++st->bucket >= INSTANCE_BUCKETS) |
| 917 | return NULL; |
| 918 | |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 919 | h = rcu_dereference_bh(hlist_first_rcu(&instance_table[st->bucket])); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 920 | } |
| 921 | return h; |
| 922 | } |
| 923 | |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 924 | 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] | 925 | { |
| 926 | struct hlist_node *head; |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 927 | head = get_first(st); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 928 | |
| 929 | if (head) |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 930 | while (pos && (head = get_next(st, head))) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 931 | pos--; |
| 932 | return pos ? NULL : head; |
| 933 | } |
| 934 | |
| 935 | static void *seq_start(struct seq_file *seq, loff_t *pos) |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 936 | __acquires(rcu_bh) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 937 | { |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 938 | rcu_read_lock_bh(); |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 939 | return get_idx(seq->private, *pos); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 940 | } |
| 941 | |
| 942 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 943 | { |
| 944 | (*pos)++; |
Michal Miroslaw | f76cdce | 2007-03-23 11:12:03 -0700 | [diff] [blame] | 945 | return get_next(s->private, v); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 946 | } |
| 947 | |
| 948 | static void seq_stop(struct seq_file *s, void *v) |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 949 | __releases(rcu_bh) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 950 | { |
Eric Dumazet | bed1be2 | 2010-06-09 18:14:58 +0200 | [diff] [blame] | 951 | rcu_read_unlock_bh(); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 952 | } |
| 953 | |
| 954 | static int seq_show(struct seq_file *s, void *v) |
| 955 | { |
| 956 | const struct nfulnl_instance *inst = v; |
| 957 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 958 | return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 959 | inst->group_num, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 960 | inst->peer_portid, inst->qlen, |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 961 | inst->copy_mode, inst->copy_range, |
| 962 | inst->flushtimeout, atomic_read(&inst->use)); |
| 963 | } |
| 964 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 965 | static const struct seq_operations nful_seq_ops = { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 966 | .start = seq_start, |
| 967 | .next = seq_next, |
| 968 | .stop = seq_stop, |
| 969 | .show = seq_show, |
| 970 | }; |
| 971 | |
| 972 | static int nful_open(struct inode *inode, struct file *file) |
| 973 | { |
Pavel Emelyanov | e2da591 | 2007-10-10 02:29:58 -0700 | [diff] [blame] | 974 | return seq_open_private(file, &nful_seq_ops, |
| 975 | sizeof(struct iter_state)); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 976 | } |
| 977 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 978 | static const struct file_operations nful_file_ops = { |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 979 | .owner = THIS_MODULE, |
| 980 | .open = nful_open, |
| 981 | .read = seq_read, |
| 982 | .llseek = seq_lseek, |
| 983 | .release = seq_release_private, |
| 984 | }; |
| 985 | |
| 986 | #endif /* PROC_FS */ |
| 987 | |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 988 | static int __init nfnetlink_log_init(void) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 989 | { |
| 990 | int i, status = -ENOMEM; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 991 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 992 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
| 993 | INIT_HLIST_HEAD(&instance_table[i]); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 994 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 995 | /* it's not really all that important to have a random value, so |
| 996 | * we can do this from the init function, even if there hasn't |
| 997 | * been that much entropy yet */ |
| 998 | get_random_bytes(&hash_init, sizeof(hash_init)); |
| 999 | |
| 1000 | netlink_register_notifier(&nfulnl_rtnl_notifier); |
| 1001 | status = nfnetlink_subsys_register(&nfulnl_subsys); |
| 1002 | if (status < 0) { |
| 1003 | printk(KERN_ERR "log: failed to create netlink socket\n"); |
| 1004 | goto cleanup_netlink_notifier; |
| 1005 | } |
| 1006 | |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 1007 | status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger); |
| 1008 | if (status < 0) { |
| 1009 | printk(KERN_ERR "log: failed to register logger\n"); |
| 1010 | goto cleanup_subsys; |
| 1011 | } |
| 1012 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1013 | #ifdef CONFIG_PROC_FS |
Denis V. Lunev | 8eeee8b | 2008-03-27 16:55:53 -0700 | [diff] [blame] | 1014 | if (!proc_create("nfnetlink_log", 0440, |
Julia Lawall | 6fc09f1 | 2012-08-29 06:49:17 +0000 | [diff] [blame] | 1015 | proc_net_netfilter, &nful_file_ops)) { |
| 1016 | status = -ENOMEM; |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 1017 | goto cleanup_logger; |
Julia Lawall | 6fc09f1 | 2012-08-29 06:49:17 +0000 | [diff] [blame] | 1018 | } |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1019 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1020 | return status; |
| 1021 | |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1022 | #ifdef CONFIG_PROC_FS |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 1023 | cleanup_logger: |
| 1024 | nf_log_unregister(&nfulnl_logger); |
| 1025 | #endif |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1026 | cleanup_subsys: |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1027 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
| 1028 | cleanup_netlink_notifier: |
| 1029 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); |
| 1030 | return status; |
| 1031 | } |
| 1032 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1033 | static void __exit nfnetlink_log_fini(void) |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1034 | { |
Patrick McHardy | e92ad99 | 2007-02-12 11:11:55 -0800 | [diff] [blame] | 1035 | nf_log_unregister(&nfulnl_logger); |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 1036 | #ifdef CONFIG_PROC_FS |
| 1037 | remove_proc_entry("nfnetlink_log", proc_net_netfilter); |
| 1038 | #endif |
| 1039 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
| 1040 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1041 | } |
| 1042 | |
| 1043 | MODULE_DESCRIPTION("netfilter userspace logging"); |
| 1044 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); |
| 1045 | MODULE_LICENSE("GPL"); |
Harald Welte | f682fae | 2005-08-09 20:20:34 -0700 | [diff] [blame] | 1046 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
Harald Welte | 0597f26 | 2005-08-09 19:58:39 -0700 | [diff] [blame] | 1047 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1048 | module_init(nfnetlink_log_init); |
| 1049 | module_exit(nfnetlink_log_fini); |