Commit | Line | Data |
---|---|---|
94139027 PNA |
1 | /* |
2 | * (C) 2011 Pablo Neira Ayuso <pablo@netfilter.org> | |
3 | * (C) 2011 Intra2net AG <http://www.intra2net.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation (or any later at your option). | |
8 | */ | |
9 | #include <linux/init.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/skbuff.h> | |
6523cf9a | 13 | #include <linux/atomic.h> |
94139027 PNA |
14 | #include <linux/netlink.h> |
15 | #include <linux/rculist.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/types.h> | |
18 | #include <linux/errno.h> | |
19 | #include <net/netlink.h> | |
20 | #include <net/sock.h> | |
94139027 PNA |
21 | |
22 | #include <linux/netfilter.h> | |
23 | #include <linux/netfilter/nfnetlink.h> | |
24 | #include <linux/netfilter/nfnetlink_acct.h> | |
25 | ||
26 | MODULE_LICENSE("GPL"); | |
27 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); | |
28 | MODULE_DESCRIPTION("nfacct: Extended Netfilter accounting infrastructure"); | |
29 | ||
94139027 PNA |
30 | struct nf_acct { |
31 | atomic64_t pkts; | |
32 | atomic64_t bytes; | |
683399ed | 33 | unsigned long flags; |
94139027 PNA |
34 | struct list_head head; |
35 | atomic_t refcnt; | |
36 | char name[NFACCT_NAME_MAX]; | |
37 | struct rcu_head rcu_head; | |
683399ed | 38 | char data[0]; |
94139027 PNA |
39 | }; |
40 | ||
f111f780 AP |
41 | struct nfacct_filter { |
42 | u32 value; | |
43 | u32 mask; | |
44 | }; | |
45 | ||
683399ed | 46 | #define NFACCT_F_QUOTA (NFACCT_F_QUOTA_PKTS | NFACCT_F_QUOTA_BYTES) |
b6d04688 | 47 | #define NFACCT_OVERQUOTA_BIT 2 /* NFACCT_F_OVERQUOTA */ |
683399ed | 48 | |
7b8002a1 PNA |
49 | static int nfnl_acct_new(struct net *net, struct sock *nfnl, |
50 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
51 | const struct nlattr * const tb[]) | |
94139027 PNA |
52 | { |
53 | struct nf_acct *nfacct, *matching = NULL; | |
54 | char *acct_name; | |
683399ed MP |
55 | unsigned int size = 0; |
56 | u32 flags = 0; | |
94139027 PNA |
57 | |
58 | if (!tb[NFACCT_NAME]) | |
59 | return -EINVAL; | |
60 | ||
61 | acct_name = nla_data(tb[NFACCT_NAME]); | |
deadcfc3 PNA |
62 | if (strlen(acct_name) == 0) |
63 | return -EINVAL; | |
94139027 | 64 | |
3499abb2 | 65 | list_for_each_entry(nfacct, &net->nfnl_acct_list, head) { |
94139027 PNA |
66 | if (strncmp(nfacct->name, acct_name, NFACCT_NAME_MAX) != 0) |
67 | continue; | |
68 | ||
69 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
70 | return -EEXIST; | |
71 | ||
72 | matching = nfacct; | |
73 | break; | |
74 | } | |
75 | ||
76 | if (matching) { | |
77 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { | |
78 | /* reset counters if you request a replacement. */ | |
79 | atomic64_set(&matching->pkts, 0); | |
80 | atomic64_set(&matching->bytes, 0); | |
f9da455b | 81 | smp_mb__before_atomic(); |
683399ed MP |
82 | /* reset overquota flag if quota is enabled. */ |
83 | if ((matching->flags & NFACCT_F_QUOTA)) | |
b6d04688 AP |
84 | clear_bit(NFACCT_OVERQUOTA_BIT, |
85 | &matching->flags); | |
94139027 PNA |
86 | return 0; |
87 | } | |
88 | return -EBUSY; | |
89 | } | |
90 | ||
683399ed MP |
91 | if (tb[NFACCT_FLAGS]) { |
92 | flags = ntohl(nla_get_be32(tb[NFACCT_FLAGS])); | |
93 | if (flags & ~NFACCT_F_QUOTA) | |
94 | return -EOPNOTSUPP; | |
95 | if ((flags & NFACCT_F_QUOTA) == NFACCT_F_QUOTA) | |
96 | return -EINVAL; | |
97 | if (flags & NFACCT_F_OVERQUOTA) | |
98 | return -EINVAL; | |
eda3fc50 PT |
99 | if ((flags & NFACCT_F_QUOTA) && !tb[NFACCT_QUOTA]) |
100 | return -EINVAL; | |
683399ed MP |
101 | |
102 | size += sizeof(u64); | |
103 | } | |
104 | ||
105 | nfacct = kzalloc(sizeof(struct nf_acct) + size, GFP_KERNEL); | |
94139027 PNA |
106 | if (nfacct == NULL) |
107 | return -ENOMEM; | |
108 | ||
683399ed MP |
109 | if (flags & NFACCT_F_QUOTA) { |
110 | u64 *quota = (u64 *)nfacct->data; | |
111 | ||
112 | *quota = be64_to_cpu(nla_get_be64(tb[NFACCT_QUOTA])); | |
113 | nfacct->flags = flags; | |
114 | } | |
115 | ||
94139027 PNA |
116 | strncpy(nfacct->name, nla_data(tb[NFACCT_NAME]), NFACCT_NAME_MAX); |
117 | ||
118 | if (tb[NFACCT_BYTES]) { | |
119 | atomic64_set(&nfacct->bytes, | |
fe31d1a8 | 120 | be64_to_cpu(nla_get_be64(tb[NFACCT_BYTES]))); |
94139027 PNA |
121 | } |
122 | if (tb[NFACCT_PKTS]) { | |
123 | atomic64_set(&nfacct->pkts, | |
fe31d1a8 | 124 | be64_to_cpu(nla_get_be64(tb[NFACCT_PKTS]))); |
94139027 PNA |
125 | } |
126 | atomic_set(&nfacct->refcnt, 1); | |
3499abb2 | 127 | list_add_tail_rcu(&nfacct->head, &net->nfnl_acct_list); |
94139027 PNA |
128 | return 0; |
129 | } | |
130 | ||
131 | static int | |
15e47304 | 132 | nfnl_acct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, |
94139027 PNA |
133 | int event, struct nf_acct *acct) |
134 | { | |
135 | struct nlmsghdr *nlh; | |
136 | struct nfgenmsg *nfmsg; | |
15e47304 | 137 | unsigned int flags = portid ? NLM_F_MULTI : 0; |
94139027 | 138 | u64 pkts, bytes; |
d24675cb | 139 | u32 old_flags; |
94139027 PNA |
140 | |
141 | event |= NFNL_SUBSYS_ACCT << 8; | |
15e47304 | 142 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); |
94139027 PNA |
143 | if (nlh == NULL) |
144 | goto nlmsg_failure; | |
145 | ||
146 | nfmsg = nlmsg_data(nlh); | |
147 | nfmsg->nfgen_family = AF_UNSPEC; | |
148 | nfmsg->version = NFNETLINK_V0; | |
149 | nfmsg->res_id = 0; | |
150 | ||
7c801189 DM |
151 | if (nla_put_string(skb, NFACCT_NAME, acct->name)) |
152 | goto nla_put_failure; | |
94139027 | 153 | |
d24675cb | 154 | old_flags = acct->flags; |
94139027 PNA |
155 | if (type == NFNL_MSG_ACCT_GET_CTRZERO) { |
156 | pkts = atomic64_xchg(&acct->pkts, 0); | |
157 | bytes = atomic64_xchg(&acct->bytes, 0); | |
f9da455b | 158 | smp_mb__before_atomic(); |
683399ed | 159 | if (acct->flags & NFACCT_F_QUOTA) |
b6d04688 | 160 | clear_bit(NFACCT_OVERQUOTA_BIT, &acct->flags); |
94139027 PNA |
161 | } else { |
162 | pkts = atomic64_read(&acct->pkts); | |
163 | bytes = atomic64_read(&acct->bytes); | |
164 | } | |
b46f6ded ND |
165 | if (nla_put_be64(skb, NFACCT_PKTS, cpu_to_be64(pkts), |
166 | NFACCT_PAD) || | |
167 | nla_put_be64(skb, NFACCT_BYTES, cpu_to_be64(bytes), | |
168 | NFACCT_PAD) || | |
7c801189 DM |
169 | nla_put_be32(skb, NFACCT_USE, htonl(atomic_read(&acct->refcnt)))) |
170 | goto nla_put_failure; | |
683399ed MP |
171 | if (acct->flags & NFACCT_F_QUOTA) { |
172 | u64 *quota = (u64 *)acct->data; | |
94139027 | 173 | |
d24675cb | 174 | if (nla_put_be32(skb, NFACCT_FLAGS, htonl(old_flags)) || |
b46f6ded ND |
175 | nla_put_be64(skb, NFACCT_QUOTA, cpu_to_be64(*quota), |
176 | NFACCT_PAD)) | |
683399ed MP |
177 | goto nla_put_failure; |
178 | } | |
94139027 PNA |
179 | nlmsg_end(skb, nlh); |
180 | return skb->len; | |
181 | ||
182 | nlmsg_failure: | |
183 | nla_put_failure: | |
184 | nlmsg_cancel(skb, nlh); | |
185 | return -1; | |
186 | } | |
187 | ||
188 | static int | |
189 | nfnl_acct_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
190 | { | |
3499abb2 | 191 | struct net *net = sock_net(skb->sk); |
94139027 | 192 | struct nf_acct *cur, *last; |
f111f780 | 193 | const struct nfacct_filter *filter = cb->data; |
94139027 PNA |
194 | |
195 | if (cb->args[2]) | |
196 | return 0; | |
197 | ||
198 | last = (struct nf_acct *)cb->args[1]; | |
199 | if (cb->args[1]) | |
200 | cb->args[1] = 0; | |
201 | ||
202 | rcu_read_lock(); | |
3499abb2 | 203 | list_for_each_entry_rcu(cur, &net->nfnl_acct_list, head) { |
991a6b73 PNA |
204 | if (last) { |
205 | if (cur != last) | |
206 | continue; | |
94139027 | 207 | |
991a6b73 PNA |
208 | last = NULL; |
209 | } | |
f111f780 AP |
210 | |
211 | if (filter && (cur->flags & filter->mask) != filter->value) | |
212 | continue; | |
213 | ||
15e47304 | 214 | if (nfnl_acct_fill_info(skb, NETLINK_CB(cb->skb).portid, |
94139027 PNA |
215 | cb->nlh->nlmsg_seq, |
216 | NFNL_MSG_TYPE(cb->nlh->nlmsg_type), | |
217 | NFNL_MSG_ACCT_NEW, cur) < 0) { | |
218 | cb->args[1] = (unsigned long)cur; | |
219 | break; | |
220 | } | |
221 | } | |
222 | if (!cb->args[1]) | |
223 | cb->args[2] = 1; | |
224 | rcu_read_unlock(); | |
225 | return skb->len; | |
226 | } | |
227 | ||
f111f780 AP |
228 | static int nfnl_acct_done(struct netlink_callback *cb) |
229 | { | |
230 | kfree(cb->data); | |
231 | return 0; | |
232 | } | |
233 | ||
234 | static const struct nla_policy filter_policy[NFACCT_FILTER_MAX + 1] = { | |
235 | [NFACCT_FILTER_MASK] = { .type = NLA_U32 }, | |
236 | [NFACCT_FILTER_VALUE] = { .type = NLA_U32 }, | |
237 | }; | |
238 | ||
239 | static struct nfacct_filter * | |
240 | nfacct_filter_alloc(const struct nlattr * const attr) | |
241 | { | |
242 | struct nfacct_filter *filter; | |
243 | struct nlattr *tb[NFACCT_FILTER_MAX + 1]; | |
244 | int err; | |
245 | ||
246 | err = nla_parse_nested(tb, NFACCT_FILTER_MAX, attr, filter_policy); | |
247 | if (err < 0) | |
248 | return ERR_PTR(err); | |
249 | ||
017b1b6d PT |
250 | if (!tb[NFACCT_FILTER_MASK] || !tb[NFACCT_FILTER_VALUE]) |
251 | return ERR_PTR(-EINVAL); | |
252 | ||
f111f780 AP |
253 | filter = kzalloc(sizeof(struct nfacct_filter), GFP_KERNEL); |
254 | if (!filter) | |
255 | return ERR_PTR(-ENOMEM); | |
256 | ||
257 | filter->mask = ntohl(nla_get_be32(tb[NFACCT_FILTER_MASK])); | |
258 | filter->value = ntohl(nla_get_be32(tb[NFACCT_FILTER_VALUE])); | |
259 | ||
260 | return filter; | |
261 | } | |
262 | ||
7b8002a1 PNA |
263 | static int nfnl_acct_get(struct net *net, struct sock *nfnl, |
264 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
265 | const struct nlattr * const tb[]) | |
94139027 | 266 | { |
3ab0b245 | 267 | int ret = -ENOENT; |
94139027 PNA |
268 | struct nf_acct *cur; |
269 | char *acct_name; | |
270 | ||
271 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
80d326fa PNA |
272 | struct netlink_dump_control c = { |
273 | .dump = nfnl_acct_dump, | |
f111f780 | 274 | .done = nfnl_acct_done, |
80d326fa | 275 | }; |
f111f780 AP |
276 | |
277 | if (tb[NFACCT_FILTER]) { | |
278 | struct nfacct_filter *filter; | |
279 | ||
280 | filter = nfacct_filter_alloc(tb[NFACCT_FILTER]); | |
281 | if (IS_ERR(filter)) | |
282 | return PTR_ERR(filter); | |
283 | ||
284 | c.data = filter; | |
285 | } | |
80d326fa | 286 | return netlink_dump_start(nfnl, skb, nlh, &c); |
94139027 PNA |
287 | } |
288 | ||
289 | if (!tb[NFACCT_NAME]) | |
290 | return -EINVAL; | |
291 | acct_name = nla_data(tb[NFACCT_NAME]); | |
292 | ||
3499abb2 | 293 | list_for_each_entry(cur, &net->nfnl_acct_list, head) { |
94139027 PNA |
294 | struct sk_buff *skb2; |
295 | ||
296 | if (strncmp(cur->name, acct_name, NFACCT_NAME_MAX)!= 0) | |
297 | continue; | |
298 | ||
299 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
3ab0b245 PNA |
300 | if (skb2 == NULL) { |
301 | ret = -ENOMEM; | |
94139027 | 302 | break; |
3ab0b245 | 303 | } |
94139027 | 304 | |
15e47304 | 305 | ret = nfnl_acct_fill_info(skb2, NETLINK_CB(skb).portid, |
94139027 PNA |
306 | nlh->nlmsg_seq, |
307 | NFNL_MSG_TYPE(nlh->nlmsg_type), | |
308 | NFNL_MSG_ACCT_NEW, cur); | |
3ab0b245 | 309 | if (ret <= 0) { |
94139027 | 310 | kfree_skb(skb2); |
3ab0b245 PNA |
311 | break; |
312 | } | |
15e47304 | 313 | ret = netlink_unicast(nfnl, skb2, NETLINK_CB(skb).portid, |
3ab0b245 PNA |
314 | MSG_DONTWAIT); |
315 | if (ret > 0) | |
316 | ret = 0; | |
94139027 | 317 | |
3ab0b245 PNA |
318 | /* this avoids a loop in nfnetlink. */ |
319 | return ret == -EAGAIN ? -ENOBUFS : ret; | |
94139027 PNA |
320 | } |
321 | return ret; | |
322 | } | |
323 | ||
324 | /* try to delete object, fail if it is still in use. */ | |
325 | static int nfnl_acct_try_del(struct nf_acct *cur) | |
326 | { | |
327 | int ret = 0; | |
328 | ||
329 | /* we want to avoid races with nfnl_acct_find_get. */ | |
330 | if (atomic_dec_and_test(&cur->refcnt)) { | |
331 | /* We are protected by nfnl mutex. */ | |
332 | list_del_rcu(&cur->head); | |
333 | kfree_rcu(cur, rcu_head); | |
334 | } else { | |
335 | /* still in use, restore reference counter. */ | |
336 | atomic_inc(&cur->refcnt); | |
337 | ret = -EBUSY; | |
338 | } | |
339 | return ret; | |
340 | } | |
341 | ||
7b8002a1 PNA |
342 | static int nfnl_acct_del(struct net *net, struct sock *nfnl, |
343 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
344 | const struct nlattr * const tb[]) | |
94139027 PNA |
345 | { |
346 | char *acct_name; | |
347 | struct nf_acct *cur; | |
348 | int ret = -ENOENT; | |
349 | ||
350 | if (!tb[NFACCT_NAME]) { | |
3499abb2 | 351 | list_for_each_entry(cur, &net->nfnl_acct_list, head) |
94139027 PNA |
352 | nfnl_acct_try_del(cur); |
353 | ||
354 | return 0; | |
355 | } | |
356 | acct_name = nla_data(tb[NFACCT_NAME]); | |
357 | ||
3499abb2 | 358 | list_for_each_entry(cur, &net->nfnl_acct_list, head) { |
94139027 PNA |
359 | if (strncmp(cur->name, acct_name, NFACCT_NAME_MAX) != 0) |
360 | continue; | |
361 | ||
362 | ret = nfnl_acct_try_del(cur); | |
363 | if (ret < 0) | |
364 | return ret; | |
365 | ||
366 | break; | |
367 | } | |
368 | return ret; | |
369 | } | |
370 | ||
371 | static const struct nla_policy nfnl_acct_policy[NFACCT_MAX+1] = { | |
372 | [NFACCT_NAME] = { .type = NLA_NUL_STRING, .len = NFACCT_NAME_MAX-1 }, | |
373 | [NFACCT_BYTES] = { .type = NLA_U64 }, | |
374 | [NFACCT_PKTS] = { .type = NLA_U64 }, | |
683399ed MP |
375 | [NFACCT_FLAGS] = { .type = NLA_U32 }, |
376 | [NFACCT_QUOTA] = { .type = NLA_U64 }, | |
f111f780 | 377 | [NFACCT_FILTER] = {.type = NLA_NESTED }, |
94139027 PNA |
378 | }; |
379 | ||
380 | static const struct nfnl_callback nfnl_acct_cb[NFNL_MSG_ACCT_MAX] = { | |
381 | [NFNL_MSG_ACCT_NEW] = { .call = nfnl_acct_new, | |
382 | .attr_count = NFACCT_MAX, | |
383 | .policy = nfnl_acct_policy }, | |
384 | [NFNL_MSG_ACCT_GET] = { .call = nfnl_acct_get, | |
385 | .attr_count = NFACCT_MAX, | |
386 | .policy = nfnl_acct_policy }, | |
387 | [NFNL_MSG_ACCT_GET_CTRZERO] = { .call = nfnl_acct_get, | |
388 | .attr_count = NFACCT_MAX, | |
389 | .policy = nfnl_acct_policy }, | |
390 | [NFNL_MSG_ACCT_DEL] = { .call = nfnl_acct_del, | |
391 | .attr_count = NFACCT_MAX, | |
392 | .policy = nfnl_acct_policy }, | |
393 | }; | |
394 | ||
395 | static const struct nfnetlink_subsystem nfnl_acct_subsys = { | |
396 | .name = "acct", | |
397 | .subsys_id = NFNL_SUBSYS_ACCT, | |
398 | .cb_count = NFNL_MSG_ACCT_MAX, | |
399 | .cb = nfnl_acct_cb, | |
400 | }; | |
401 | ||
402 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ACCT); | |
403 | ||
3499abb2 | 404 | struct nf_acct *nfnl_acct_find_get(struct net *net, const char *acct_name) |
94139027 PNA |
405 | { |
406 | struct nf_acct *cur, *acct = NULL; | |
407 | ||
408 | rcu_read_lock(); | |
3499abb2 | 409 | list_for_each_entry_rcu(cur, &net->nfnl_acct_list, head) { |
94139027 PNA |
410 | if (strncmp(cur->name, acct_name, NFACCT_NAME_MAX)!= 0) |
411 | continue; | |
412 | ||
413 | if (!try_module_get(THIS_MODULE)) | |
414 | goto err; | |
415 | ||
416 | if (!atomic_inc_not_zero(&cur->refcnt)) { | |
417 | module_put(THIS_MODULE); | |
418 | goto err; | |
419 | } | |
420 | ||
421 | acct = cur; | |
422 | break; | |
423 | } | |
424 | err: | |
425 | rcu_read_unlock(); | |
426 | return acct; | |
427 | } | |
428 | EXPORT_SYMBOL_GPL(nfnl_acct_find_get); | |
429 | ||
430 | void nfnl_acct_put(struct nf_acct *acct) | |
431 | { | |
3499abb2 AS |
432 | if (atomic_dec_and_test(&acct->refcnt)) |
433 | kfree_rcu(acct, rcu_head); | |
434 | ||
94139027 PNA |
435 | module_put(THIS_MODULE); |
436 | } | |
437 | EXPORT_SYMBOL_GPL(nfnl_acct_put); | |
438 | ||
439 | void nfnl_acct_update(const struct sk_buff *skb, struct nf_acct *nfacct) | |
440 | { | |
441 | atomic64_inc(&nfacct->pkts); | |
442 | atomic64_add(skb->len, &nfacct->bytes); | |
443 | } | |
444 | EXPORT_SYMBOL_GPL(nfnl_acct_update); | |
445 | ||
683399ed MP |
446 | static void nfnl_overquota_report(struct nf_acct *nfacct) |
447 | { | |
448 | int ret; | |
449 | struct sk_buff *skb; | |
450 | ||
451 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); | |
452 | if (skb == NULL) | |
453 | return; | |
454 | ||
455 | ret = nfnl_acct_fill_info(skb, 0, 0, NFNL_MSG_ACCT_OVERQUOTA, 0, | |
456 | nfacct); | |
457 | if (ret <= 0) { | |
458 | kfree_skb(skb); | |
459 | return; | |
460 | } | |
461 | netlink_broadcast(init_net.nfnl, skb, 0, NFNLGRP_ACCT_QUOTA, | |
462 | GFP_ATOMIC); | |
463 | } | |
464 | ||
465 | int nfnl_acct_overquota(const struct sk_buff *skb, struct nf_acct *nfacct) | |
466 | { | |
467 | u64 now; | |
468 | u64 *quota; | |
469 | int ret = NFACCT_UNDERQUOTA; | |
470 | ||
471 | /* no place here if we don't have a quota */ | |
472 | if (!(nfacct->flags & NFACCT_F_QUOTA)) | |
473 | return NFACCT_NO_QUOTA; | |
474 | ||
475 | quota = (u64 *)nfacct->data; | |
476 | now = (nfacct->flags & NFACCT_F_QUOTA_PKTS) ? | |
477 | atomic64_read(&nfacct->pkts) : atomic64_read(&nfacct->bytes); | |
478 | ||
479 | ret = now > *quota; | |
480 | ||
481 | if (now >= *quota && | |
b6d04688 | 482 | !test_and_set_bit(NFACCT_OVERQUOTA_BIT, &nfacct->flags)) { |
683399ed MP |
483 | nfnl_overquota_report(nfacct); |
484 | } | |
485 | ||
486 | return ret; | |
487 | } | |
488 | EXPORT_SYMBOL_GPL(nfnl_acct_overquota); | |
489 | ||
3499abb2 AS |
490 | static int __net_init nfnl_acct_net_init(struct net *net) |
491 | { | |
492 | INIT_LIST_HEAD(&net->nfnl_acct_list); | |
493 | ||
494 | return 0; | |
495 | } | |
496 | ||
497 | static void __net_exit nfnl_acct_net_exit(struct net *net) | |
498 | { | |
499 | struct nf_acct *cur, *tmp; | |
500 | ||
501 | list_for_each_entry_safe(cur, tmp, &net->nfnl_acct_list, head) { | |
502 | list_del_rcu(&cur->head); | |
503 | ||
504 | if (atomic_dec_and_test(&cur->refcnt)) | |
505 | kfree_rcu(cur, rcu_head); | |
506 | } | |
507 | } | |
508 | ||
509 | static struct pernet_operations nfnl_acct_ops = { | |
510 | .init = nfnl_acct_net_init, | |
511 | .exit = nfnl_acct_net_exit, | |
512 | }; | |
513 | ||
94139027 PNA |
514 | static int __init nfnl_acct_init(void) |
515 | { | |
516 | int ret; | |
517 | ||
3499abb2 AS |
518 | ret = register_pernet_subsys(&nfnl_acct_ops); |
519 | if (ret < 0) { | |
520 | pr_err("nfnl_acct_init: failed to register pernet ops\n"); | |
521 | goto err_out; | |
522 | } | |
523 | ||
94139027 PNA |
524 | pr_info("nfnl_acct: registering with nfnetlink.\n"); |
525 | ret = nfnetlink_subsys_register(&nfnl_acct_subsys); | |
526 | if (ret < 0) { | |
527 | pr_err("nfnl_acct_init: cannot register with nfnetlink.\n"); | |
3499abb2 | 528 | goto cleanup_pernet; |
94139027 PNA |
529 | } |
530 | return 0; | |
3499abb2 AS |
531 | |
532 | cleanup_pernet: | |
533 | unregister_pernet_subsys(&nfnl_acct_ops); | |
94139027 PNA |
534 | err_out: |
535 | return ret; | |
536 | } | |
537 | ||
538 | static void __exit nfnl_acct_exit(void) | |
539 | { | |
94139027 PNA |
540 | pr_info("nfnl_acct: unregistering from nfnetlink.\n"); |
541 | nfnetlink_subsys_unregister(&nfnl_acct_subsys); | |
3499abb2 | 542 | unregister_pernet_subsys(&nfnl_acct_ops); |
94139027 PNA |
543 | } |
544 | ||
545 | module_init(nfnl_acct_init); | |
546 | module_exit(nfnl_acct_exit); |