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