Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * netfilter module for userspace packet logging daemons | |
3 | * | |
4 | * (C) 2000-2004 by Harald Welte <laforge@netfilter.org> | |
1da177e4 LT |
5 | * (C) 1999-2001 Paul `Rusty' Russell |
6 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> | |
f229f6ce | 7 | * (C) 2005-2007 Patrick McHardy <kaber@trash.net> |
1da177e4 LT |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
e905a9ed YH |
13 | * This module accepts two parameters: |
14 | * | |
1da177e4 LT |
15 | * nlbufsiz: |
16 | * The parameter specifies how big the buffer for each netlink multicast | |
17 | * group is. e.g. If you say nlbufsiz=8192, up to eight kb of packets will | |
18 | * get accumulated in the kernel until they are sent to userspace. It is | |
19 | * NOT possible to allocate more than 128kB, and it is strongly discouraged, | |
20 | * because atomically allocating 128kB inside the network rx softirq is not | |
21 | * reliable. Please also keep in mind that this buffer size is allocated for | |
22 | * each nlgroup you are using, so the total kernel memory usage increases | |
23 | * by that factor. | |
24 | * | |
c2db2924 HE |
25 | * Actually you should use nlbufsiz a bit smaller than PAGE_SIZE, since |
26 | * nlbufsiz is used with alloc_skb, which adds another | |
27 | * sizeof(struct skb_shared_info). Use NLMSG_GOODSIZE instead. | |
28 | * | |
1da177e4 LT |
29 | * flushtimeout: |
30 | * Specify, after how many hundredths of a second the queue should be | |
31 | * flushed even if it is not full yet. | |
1da177e4 | 32 | */ |
ff67e4e4 | 33 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
1da177e4 | 34 | #include <linux/module.h> |
1da177e4 LT |
35 | #include <linux/spinlock.h> |
36 | #include <linux/socket.h> | |
5a0e3ad6 | 37 | #include <linux/slab.h> |
1da177e4 LT |
38 | #include <linux/skbuff.h> |
39 | #include <linux/kernel.h> | |
40 | #include <linux/timer.h> | |
573ce260 | 41 | #include <net/netlink.h> |
1da177e4 LT |
42 | #include <linux/netdevice.h> |
43 | #include <linux/mm.h> | |
44 | #include <linux/moduleparam.h> | |
45 | #include <linux/netfilter.h> | |
6709dbbb | 46 | #include <linux/netfilter/x_tables.h> |
1da177e4 | 47 | #include <linux/netfilter_ipv4/ipt_ULOG.h> |
f01ffbd6 | 48 | #include <net/netfilter/nf_log.h> |
35543067 | 49 | #include <net/netns/generic.h> |
1da177e4 LT |
50 | #include <net/sock.h> |
51 | #include <linux/bitops.h> | |
01102e7c | 52 | #include <asm/unaligned.h> |
1da177e4 LT |
53 | |
54 | MODULE_LICENSE("GPL"); | |
55 | MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>"); | |
2ae15b64 | 56 | MODULE_DESCRIPTION("Xtables: packet logging to netlink using ULOG"); |
4fdb3bb7 | 57 | MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_NFLOG); |
1da177e4 LT |
58 | |
59 | #define ULOG_NL_EVENT 111 /* Harald's favorite number */ | |
60 | #define ULOG_MAXNLGROUPS 32 /* numer of nlgroups */ | |
61 | ||
c2db2924 | 62 | static unsigned int nlbufsiz = NLMSG_GOODSIZE; |
e7be6994 | 63 | module_param(nlbufsiz, uint, 0400); |
1da177e4 LT |
64 | MODULE_PARM_DESC(nlbufsiz, "netlink buffer size"); |
65 | ||
66 | static unsigned int flushtimeout = 10; | |
e7be6994 | 67 | module_param(flushtimeout, uint, 0600); |
1da177e4 LT |
68 | MODULE_PARM_DESC(flushtimeout, "buffer flush timeout (hundredths of a second)"); |
69 | ||
eb939922 | 70 | static bool nflog = true; |
e7be6994 | 71 | module_param(nflog, bool, 0400); |
1da177e4 LT |
72 | MODULE_PARM_DESC(nflog, "register as internal netfilter logging module"); |
73 | ||
74 | /* global data structures */ | |
75 | ||
76 | typedef struct { | |
77 | unsigned int qlen; /* number of nlmsgs' in the skb */ | |
78 | struct nlmsghdr *lastnlh; /* netlink header of last msg in skb */ | |
79 | struct sk_buff *skb; /* the pre-allocated skb */ | |
80 | struct timer_list timer; /* the timer function */ | |
81 | } ulog_buff_t; | |
82 | ||
35543067 G |
83 | static int ulog_net_id __read_mostly; |
84 | struct ulog_net { | |
85 | unsigned int nlgroup[ULOG_MAXNLGROUPS]; | |
86 | ulog_buff_t ulog_buffers[ULOG_MAXNLGROUPS]; | |
87 | struct sock *nflognl; | |
88 | spinlock_t lock; | |
89 | }; | |
1da177e4 | 90 | |
35543067 G |
91 | static struct ulog_net *ulog_pernet(struct net *net) |
92 | { | |
93 | return net_generic(net, ulog_net_id); | |
94 | } | |
1da177e4 LT |
95 | |
96 | /* send one ulog_buff_t to userspace */ | |
35543067 | 97 | static void ulog_send(struct ulog_net *ulog, unsigned int nlgroupnum) |
1da177e4 | 98 | { |
35543067 | 99 | ulog_buff_t *ub = &ulog->ulog_buffers[nlgroupnum]; |
1da177e4 | 100 | |
25cc4ae9 YX |
101 | pr_debug("ulog_send: timer is deleting\n"); |
102 | del_timer(&ub->timer); | |
1da177e4 | 103 | |
dcb7cd97 | 104 | if (!ub->skb) { |
ff67e4e4 | 105 | pr_debug("ulog_send: nothing to send\n"); |
dcb7cd97 MH |
106 | return; |
107 | } | |
108 | ||
1da177e4 LT |
109 | /* last nlmsg needs NLMSG_DONE */ |
110 | if (ub->qlen > 1) | |
111 | ub->lastnlh->nlmsg_type = NLMSG_DONE; | |
112 | ||
ac6d439d | 113 | NETLINK_CB(ub->skb).dst_group = nlgroupnum + 1; |
ff67e4e4 | 114 | pr_debug("throwing %d packets to netlink group %u\n", |
0d53778e | 115 | ub->qlen, nlgroupnum + 1); |
35543067 G |
116 | netlink_broadcast(ulog->nflognl, ub->skb, 0, nlgroupnum + 1, |
117 | GFP_ATOMIC); | |
1da177e4 LT |
118 | |
119 | ub->qlen = 0; | |
120 | ub->skb = NULL; | |
121 | ub->lastnlh = NULL; | |
1da177e4 LT |
122 | } |
123 | ||
124 | ||
125 | /* timer function to flush queue in flushtimeout time */ | |
126 | static void ulog_timer(unsigned long data) | |
127 | { | |
35543067 G |
128 | struct ulog_net *ulog = container_of((void *)data, |
129 | struct ulog_net, | |
130 | nlgroup[*(unsigned int *)data]); | |
ff67e4e4 | 131 | pr_debug("timer function called, calling ulog_send\n"); |
1da177e4 LT |
132 | |
133 | /* lock to protect against somebody modifying our structure | |
134 | * from ipt_ulog_target at the same time */ | |
35543067 G |
135 | spin_lock_bh(&ulog->lock); |
136 | ulog_send(ulog, data); | |
137 | spin_unlock_bh(&ulog->lock); | |
1da177e4 LT |
138 | } |
139 | ||
140 | static struct sk_buff *ulog_alloc_skb(unsigned int size) | |
141 | { | |
142 | struct sk_buff *skb; | |
ad2ad0f9 | 143 | unsigned int n; |
1da177e4 LT |
144 | |
145 | /* alloc skb which should be big enough for a whole | |
146 | * multipart message. WARNING: has to be <= 131000 | |
147 | * due to slab allocator restrictions */ | |
148 | ||
ad2ad0f9 | 149 | n = max(size, nlbufsiz); |
0a9ee813 | 150 | skb = alloc_skb(n, GFP_ATOMIC | __GFP_NOWARN); |
1da177e4 | 151 | if (!skb) { |
ad2ad0f9 | 152 | if (n > size) { |
e905a9ed | 153 | /* try to allocate only as much as we need for |
ad2ad0f9 | 154 | * current packet */ |
1da177e4 | 155 | |
ad2ad0f9 PM |
156 | skb = alloc_skb(size, GFP_ATOMIC); |
157 | if (!skb) | |
ff67e4e4 | 158 | pr_debug("cannot even allocate %ub\n", size); |
ad2ad0f9 | 159 | } |
1da177e4 LT |
160 | } |
161 | ||
162 | return skb; | |
163 | } | |
164 | ||
8cdb46da HS |
165 | static void ipt_ulog_packet(struct net *net, |
166 | unsigned int hooknum, | |
1da177e4 LT |
167 | const struct sk_buff *skb, |
168 | const struct net_device *in, | |
169 | const struct net_device *out, | |
170 | const struct ipt_ulog_info *loginfo, | |
171 | const char *prefix) | |
172 | { | |
173 | ulog_buff_t *ub; | |
174 | ulog_packet_msg_t *pm; | |
175 | size_t size, copy_len; | |
176 | struct nlmsghdr *nlh; | |
b7aa0bf7 | 177 | struct timeval tv; |
35543067 | 178 | struct ulog_net *ulog = ulog_pernet(net); |
1da177e4 LT |
179 | |
180 | /* ffs == find first bit set, necessary because userspace | |
181 | * is already shifting groupnumber, but we need unshifted. | |
182 | * ffs() returns [1..32], we need [0..31] */ | |
183 | unsigned int groupnum = ffs(loginfo->nl_group) - 1; | |
184 | ||
185 | /* calculate the size of the skb needed */ | |
7c4e36bc | 186 | if (loginfo->copy_range == 0 || loginfo->copy_range > skb->len) |
1da177e4 | 187 | copy_len = skb->len; |
7c4e36bc | 188 | else |
1da177e4 | 189 | copy_len = loginfo->copy_range; |
1da177e4 | 190 | |
573ce260 | 191 | size = nlmsg_total_size(sizeof(*pm) + copy_len); |
1da177e4 | 192 | |
35543067 | 193 | ub = &ulog->ulog_buffers[groupnum]; |
e905a9ed | 194 | |
35543067 | 195 | spin_lock_bh(&ulog->lock); |
1da177e4 LT |
196 | |
197 | if (!ub->skb) { | |
198 | if (!(ub->skb = ulog_alloc_skb(size))) | |
199 | goto alloc_failure; | |
200 | } else if (ub->qlen >= loginfo->qthreshold || | |
201 | size > skb_tailroom(ub->skb)) { | |
e905a9ed | 202 | /* either the queue len is too high or we don't have |
1da177e4 LT |
203 | * enough room in nlskb left. send it to userspace. */ |
204 | ||
35543067 | 205 | ulog_send(ulog, groupnum); |
1da177e4 LT |
206 | |
207 | if (!(ub->skb = ulog_alloc_skb(size))) | |
208 | goto alloc_failure; | |
209 | } | |
210 | ||
ff67e4e4 | 211 | pr_debug("qlen %d, qthreshold %Zu\n", ub->qlen, loginfo->qthreshold); |
1da177e4 | 212 | |
c2bd4baf DM |
213 | nlh = nlmsg_put(ub->skb, 0, ub->qlen, ULOG_NL_EVENT, |
214 | sizeof(*pm)+copy_len, 0); | |
215 | if (!nlh) { | |
216 | pr_debug("error during nlmsg_put\n"); | |
217 | goto out_unlock; | |
218 | } | |
1da177e4 LT |
219 | ub->qlen++; |
220 | ||
c2bd4baf | 221 | pm = nlmsg_data(nlh); |
1da177e4 LT |
222 | |
223 | /* We might not have a timestamp, get one */ | |
b7aa0bf7 | 224 | if (skb->tstamp.tv64 == 0) |
a61bbcf2 | 225 | __net_timestamp((struct sk_buff *)skb); |
1da177e4 LT |
226 | |
227 | /* copy hook, prefix, timestamp, payload, etc. */ | |
228 | pm->data_len = copy_len; | |
b7aa0bf7 ED |
229 | tv = ktime_to_timeval(skb->tstamp); |
230 | put_unaligned(tv.tv_sec, &pm->timestamp_sec); | |
231 | put_unaligned(tv.tv_usec, &pm->timestamp_usec); | |
01102e7c | 232 | put_unaligned(skb->mark, &pm->mark); |
1da177e4 LT |
233 | pm->hook = hooknum; |
234 | if (prefix != NULL) | |
235 | strncpy(pm->prefix, prefix, sizeof(pm->prefix)); | |
236 | else if (loginfo->prefix[0] != '\0') | |
237 | strncpy(pm->prefix, loginfo->prefix, sizeof(pm->prefix)); | |
238 | else | |
239 | *(pm->prefix) = '\0'; | |
240 | ||
3666ed1c JP |
241 | if (in && in->hard_header_len > 0 && |
242 | skb->mac_header != skb->network_header && | |
243 | in->hard_header_len <= ULOG_MAC_LEN) { | |
98e399f8 | 244 | memcpy(pm->mac, skb_mac_header(skb), in->hard_header_len); |
1da177e4 LT |
245 | pm->mac_len = in->hard_header_len; |
246 | } else | |
247 | pm->mac_len = 0; | |
248 | ||
249 | if (in) | |
250 | strncpy(pm->indev_name, in->name, sizeof(pm->indev_name)); | |
251 | else | |
252 | pm->indev_name[0] = '\0'; | |
253 | ||
254 | if (out) | |
255 | strncpy(pm->outdev_name, out->name, sizeof(pm->outdev_name)); | |
256 | else | |
257 | pm->outdev_name[0] = '\0'; | |
258 | ||
259 | /* copy_len <= skb->len, so can't fail. */ | |
260 | if (skb_copy_bits(skb, 0, pm->payload, copy_len) < 0) | |
261 | BUG(); | |
e905a9ed | 262 | |
1da177e4 | 263 | /* check if we are building multi-part messages */ |
7c4e36bc | 264 | if (ub->qlen > 1) |
1da177e4 | 265 | ub->lastnlh->nlmsg_flags |= NLM_F_MULTI; |
1da177e4 LT |
266 | |
267 | ub->lastnlh = nlh; | |
268 | ||
269 | /* if timer isn't already running, start it */ | |
270 | if (!timer_pending(&ub->timer)) { | |
271 | ub->timer.expires = jiffies + flushtimeout * HZ / 100; | |
272 | add_timer(&ub->timer); | |
273 | } | |
274 | ||
275 | /* if threshold is reached, send message to userspace */ | |
276 | if (ub->qlen >= loginfo->qthreshold) { | |
277 | if (loginfo->qthreshold > 1) | |
278 | nlh->nlmsg_type = NLMSG_DONE; | |
35543067 | 279 | ulog_send(ulog, groupnum); |
1da177e4 | 280 | } |
c2bd4baf | 281 | out_unlock: |
35543067 | 282 | spin_unlock_bh(&ulog->lock); |
1da177e4 LT |
283 | |
284 | return; | |
285 | ||
1da177e4 | 286 | alloc_failure: |
ff67e4e4 | 287 | pr_debug("Error building netlink message\n"); |
35543067 | 288 | spin_unlock_bh(&ulog->lock); |
1da177e4 LT |
289 | } |
290 | ||
d3c5ee6d | 291 | static unsigned int |
4b560b44 | 292 | ulog_tg(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 | 293 | { |
8cdb46da HS |
294 | struct net *net = dev_net(par->in ? par->in : par->out); |
295 | ||
296 | ipt_ulog_packet(net, par->hooknum, skb, par->in, par->out, | |
7eb35586 | 297 | par->targinfo, NULL); |
6709dbbb | 298 | return XT_CONTINUE; |
1da177e4 | 299 | } |
e905a9ed | 300 | |
8cdb46da HS |
301 | static void ipt_logfn(struct net *net, |
302 | u_int8_t pf, | |
608c8e4f | 303 | unsigned int hooknum, |
1da177e4 LT |
304 | const struct sk_buff *skb, |
305 | const struct net_device *in, | |
306 | const struct net_device *out, | |
608c8e4f | 307 | const struct nf_loginfo *li, |
1da177e4 LT |
308 | const char *prefix) |
309 | { | |
608c8e4f HW |
310 | struct ipt_ulog_info loginfo; |
311 | ||
312 | if (!li || li->type != NF_LOG_TYPE_ULOG) { | |
313 | loginfo.nl_group = ULOG_DEFAULT_NLGROUP; | |
314 | loginfo.copy_range = 0; | |
315 | loginfo.qthreshold = ULOG_DEFAULT_QTHRESHOLD; | |
316 | loginfo.prefix[0] = '\0'; | |
317 | } else { | |
318 | loginfo.nl_group = li->u.ulog.group; | |
319 | loginfo.copy_range = li->u.ulog.copy_len; | |
320 | loginfo.qthreshold = li->u.ulog.qthreshold; | |
321 | strlcpy(loginfo.prefix, prefix, sizeof(loginfo.prefix)); | |
322 | } | |
1da177e4 | 323 | |
8cdb46da | 324 | ipt_ulog_packet(net, hooknum, skb, in, out, &loginfo, prefix); |
1da177e4 LT |
325 | } |
326 | ||
135367b8 | 327 | static int ulog_tg_check(const struct xt_tgchk_param *par) |
1da177e4 | 328 | { |
af5d6dc2 | 329 | const struct ipt_ulog_info *loginfo = par->targinfo; |
1da177e4 | 330 | |
1da177e4 | 331 | if (loginfo->prefix[sizeof(loginfo->prefix) - 1] != '\0') { |
ff67e4e4 | 332 | pr_debug("prefix not null-terminated\n"); |
d6b00a53 | 333 | return -EINVAL; |
1da177e4 | 334 | } |
1da177e4 | 335 | if (loginfo->qthreshold > ULOG_MAX_QLEN) { |
ff67e4e4 | 336 | pr_debug("queue threshold %Zu > MAX_QLEN\n", |
0d53778e | 337 | loginfo->qthreshold); |
d6b00a53 | 338 | return -EINVAL; |
1da177e4 | 339 | } |
d6b00a53 | 340 | return 0; |
1da177e4 LT |
341 | } |
342 | ||
b076deb8 PM |
343 | #ifdef CONFIG_COMPAT |
344 | struct compat_ipt_ulog_info { | |
345 | compat_uint_t nl_group; | |
346 | compat_size_t copy_range; | |
347 | compat_size_t qthreshold; | |
348 | char prefix[ULOG_PREFIX_LEN]; | |
349 | }; | |
350 | ||
739674fb | 351 | static void ulog_tg_compat_from_user(void *dst, const void *src) |
b076deb8 | 352 | { |
a47362a2 | 353 | const struct compat_ipt_ulog_info *cl = src; |
b076deb8 PM |
354 | struct ipt_ulog_info l = { |
355 | .nl_group = cl->nl_group, | |
356 | .copy_range = cl->copy_range, | |
357 | .qthreshold = cl->qthreshold, | |
358 | }; | |
359 | ||
360 | memcpy(l.prefix, cl->prefix, sizeof(l.prefix)); | |
361 | memcpy(dst, &l, sizeof(l)); | |
362 | } | |
363 | ||
739674fb | 364 | static int ulog_tg_compat_to_user(void __user *dst, const void *src) |
b076deb8 | 365 | { |
a47362a2 | 366 | const struct ipt_ulog_info *l = src; |
b076deb8 PM |
367 | struct compat_ipt_ulog_info cl = { |
368 | .nl_group = l->nl_group, | |
369 | .copy_range = l->copy_range, | |
370 | .qthreshold = l->qthreshold, | |
371 | }; | |
372 | ||
373 | memcpy(cl.prefix, l->prefix, sizeof(cl.prefix)); | |
374 | return copy_to_user(dst, &cl, sizeof(cl)) ? -EFAULT : 0; | |
375 | } | |
376 | #endif /* CONFIG_COMPAT */ | |
377 | ||
d3c5ee6d | 378 | static struct xt_target ulog_tg_reg __read_mostly = { |
1da177e4 | 379 | .name = "ULOG", |
ee999d8b | 380 | .family = NFPROTO_IPV4, |
d3c5ee6d | 381 | .target = ulog_tg, |
1d5cd909 | 382 | .targetsize = sizeof(struct ipt_ulog_info), |
d3c5ee6d | 383 | .checkentry = ulog_tg_check, |
b076deb8 PM |
384 | #ifdef CONFIG_COMPAT |
385 | .compatsize = sizeof(struct compat_ipt_ulog_info), | |
d3c5ee6d JE |
386 | .compat_from_user = ulog_tg_compat_from_user, |
387 | .compat_to_user = ulog_tg_compat_to_user, | |
b076deb8 | 388 | #endif |
1da177e4 LT |
389 | .me = THIS_MODULE, |
390 | }; | |
391 | ||
ca735b3a | 392 | static struct nf_logger ipt_ulog_logger __read_mostly = { |
608c8e4f | 393 | .name = "ipt_ULOG", |
1d5cd909 | 394 | .logfn = ipt_logfn, |
608c8e4f HW |
395 | .me = THIS_MODULE, |
396 | }; | |
397 | ||
35543067 | 398 | static int __net_init ulog_tg_net_init(struct net *net) |
1da177e4 | 399 | { |
35543067 G |
400 | int i; |
401 | struct ulog_net *ulog = ulog_pernet(net); | |
a31f2d17 PNA |
402 | struct netlink_kernel_cfg cfg = { |
403 | .groups = ULOG_MAXNLGROUPS, | |
404 | }; | |
1da177e4 | 405 | |
35543067 | 406 | spin_lock_init(&ulog->lock); |
1da177e4 | 407 | /* initialize ulog_buffers */ |
e6f689db | 408 | for (i = 0; i < ULOG_MAXNLGROUPS; i++) |
35543067 | 409 | setup_timer(&ulog->ulog_buffers[i].timer, ulog_timer, i); |
1da177e4 | 410 | |
35543067 G |
411 | ulog->nflognl = netlink_kernel_create(net, NETLINK_NFLOG, &cfg); |
412 | if (!ulog->nflognl) | |
1da177e4 LT |
413 | return -ENOMEM; |
414 | ||
1da177e4 | 415 | if (nflog) |
35543067 | 416 | nf_log_set(net, NFPROTO_IPV4, &ipt_ulog_logger); |
e905a9ed | 417 | |
1da177e4 LT |
418 | return 0; |
419 | } | |
420 | ||
35543067 | 421 | static void __net_exit ulog_tg_net_exit(struct net *net) |
1da177e4 LT |
422 | { |
423 | ulog_buff_t *ub; | |
424 | int i; | |
35543067 | 425 | struct ulog_net *ulog = ulog_pernet(net); |
1da177e4 LT |
426 | |
427 | if (nflog) | |
35543067 G |
428 | nf_log_unset(net, &ipt_ulog_logger); |
429 | ||
430 | netlink_kernel_release(ulog->nflognl); | |
1da177e4 LT |
431 | |
432 | /* remove pending timers and free allocated skb's */ | |
433 | for (i = 0; i < ULOG_MAXNLGROUPS; i++) { | |
35543067 | 434 | ub = &ulog->ulog_buffers[i]; |
25cc4ae9 YX |
435 | pr_debug("timer is deleting\n"); |
436 | del_timer(&ub->timer); | |
1da177e4 LT |
437 | |
438 | if (ub->skb) { | |
439 | kfree_skb(ub->skb); | |
440 | ub->skb = NULL; | |
441 | } | |
442 | } | |
1da177e4 LT |
443 | } |
444 | ||
35543067 G |
445 | static struct pernet_operations ulog_tg_net_ops = { |
446 | .init = ulog_tg_net_init, | |
447 | .exit = ulog_tg_net_exit, | |
448 | .id = &ulog_net_id, | |
449 | .size = sizeof(struct ulog_net), | |
450 | }; | |
451 | ||
452 | static int __init ulog_tg_init(void) | |
453 | { | |
454 | int ret; | |
455 | pr_debug("init module\n"); | |
456 | ||
457 | if (nlbufsiz > 128*1024) { | |
458 | pr_warn("Netlink buffer has to be <= 128kB\n"); | |
459 | return -EINVAL; | |
460 | } | |
461 | ||
462 | ret = register_pernet_subsys(&ulog_tg_net_ops); | |
463 | if (ret) | |
464 | goto out_pernet; | |
465 | ||
466 | ret = xt_register_target(&ulog_tg_reg); | |
467 | if (ret < 0) | |
468 | goto out_target; | |
469 | ||
470 | if (nflog) | |
471 | nf_log_register(NFPROTO_IPV4, &ipt_ulog_logger); | |
472 | ||
473 | return 0; | |
474 | ||
475 | out_target: | |
476 | unregister_pernet_subsys(&ulog_tg_net_ops); | |
477 | out_pernet: | |
478 | return ret; | |
479 | } | |
480 | ||
481 | static void __exit ulog_tg_exit(void) | |
482 | { | |
483 | pr_debug("cleanup_module\n"); | |
484 | if (nflog) | |
485 | nf_log_unregister(&ipt_ulog_logger); | |
486 | xt_unregister_target(&ulog_tg_reg); | |
487 | unregister_pernet_subsys(&ulog_tg_net_ops); | |
488 | } | |
489 | ||
d3c5ee6d JE |
490 | module_init(ulog_tg_init); |
491 | module_exit(ulog_tg_exit); |