1e97150dfSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
294139027SPablo Neira Ayuso /*
394139027SPablo Neira Ayuso * (C) 2011 Pablo Neira Ayuso <pablo@netfilter.org>
450935339SAlexander A. Klimov * (C) 2011 Intra2net AG <https://www.intra2net.com>
594139027SPablo Neira Ayuso */
694139027SPablo Neira Ayuso #include <linux/init.h>
794139027SPablo Neira Ayuso #include <linux/module.h>
894139027SPablo Neira Ayuso #include <linux/kernel.h>
994139027SPablo Neira Ayuso #include <linux/skbuff.h>
106523cf9aSAndrew Morton #include <linux/atomic.h>
11b54ab92bSReshetova, Elena #include <linux/refcount.h>
1294139027SPablo Neira Ayuso #include <linux/netlink.h>
1394139027SPablo Neira Ayuso #include <linux/rculist.h>
1494139027SPablo Neira Ayuso #include <linux/slab.h>
1594139027SPablo Neira Ayuso #include <linux/types.h>
1694139027SPablo Neira Ayuso #include <linux/errno.h>
1794139027SPablo Neira Ayuso #include <net/netlink.h>
1894139027SPablo Neira Ayuso #include <net/sock.h>
19f7583f02SWang Shanker #include <net/netns/generic.h>
2094139027SPablo Neira Ayuso
2194139027SPablo Neira Ayuso #include <linux/netfilter.h>
2294139027SPablo Neira Ayuso #include <linux/netfilter/nfnetlink.h>
2394139027SPablo Neira Ayuso #include <linux/netfilter/nfnetlink_acct.h>
2494139027SPablo Neira Ayuso
2594139027SPablo Neira Ayuso MODULE_LICENSE("GPL");
2694139027SPablo Neira Ayuso MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
2794139027SPablo Neira Ayuso MODULE_DESCRIPTION("nfacct: Extended Netfilter accounting infrastructure");
2894139027SPablo Neira Ayuso
2994139027SPablo Neira Ayuso struct nf_acct {
3094139027SPablo Neira Ayuso atomic64_t pkts;
3194139027SPablo Neira Ayuso atomic64_t bytes;
32683399edSMathieu Poirier unsigned long flags;
3394139027SPablo Neira Ayuso struct list_head head;
34b54ab92bSReshetova, Elena refcount_t refcnt;
3594139027SPablo Neira Ayuso char name[NFACCT_NAME_MAX];
3694139027SPablo Neira Ayuso struct rcu_head rcu_head;
376daf1414SGustavo A. R. Silva char data[];
3894139027SPablo Neira Ayuso };
3994139027SPablo Neira Ayuso
40f111f780SAlexey Perevalov struct nfacct_filter {
41f111f780SAlexey Perevalov u32 value;
42f111f780SAlexey Perevalov u32 mask;
43f111f780SAlexey Perevalov };
44f111f780SAlexey Perevalov
45f7583f02SWang Shanker struct nfnl_acct_net {
46f7583f02SWang Shanker struct list_head nfnl_acct_list;
47f7583f02SWang Shanker };
48f7583f02SWang Shanker
49f7583f02SWang Shanker static unsigned int nfnl_acct_net_id __read_mostly;
50f7583f02SWang Shanker
nfnl_acct_pernet(struct net * net)51f7583f02SWang Shanker static inline struct nfnl_acct_net *nfnl_acct_pernet(struct net *net)
52f7583f02SWang Shanker {
53f7583f02SWang Shanker return net_generic(net, nfnl_acct_net_id);
54f7583f02SWang Shanker }
55f7583f02SWang Shanker
56683399edSMathieu Poirier #define NFACCT_F_QUOTA (NFACCT_F_QUOTA_PKTS | NFACCT_F_QUOTA_BYTES)
57b6d04688SAlexey Perevalov #define NFACCT_OVERQUOTA_BIT 2 /* NFACCT_F_OVERQUOTA */
58683399edSMathieu Poirier
nfnl_acct_new(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const tb[])59a6555365SPablo Neira Ayuso static int nfnl_acct_new(struct sk_buff *skb, const struct nfnl_info *info,
60a6555365SPablo Neira Ayuso const struct nlattr * const tb[])
6194139027SPablo Neira Ayuso {
62a6555365SPablo Neira Ayuso struct nfnl_acct_net *nfnl_acct_net = nfnl_acct_pernet(info->net);
6394139027SPablo Neira Ayuso struct nf_acct *nfacct, *matching = NULL;
64683399edSMathieu Poirier unsigned int size = 0;
65a6555365SPablo Neira Ayuso char *acct_name;
66683399edSMathieu Poirier u32 flags = 0;
6794139027SPablo Neira Ayuso
6894139027SPablo Neira Ayuso if (!tb[NFACCT_NAME])
6994139027SPablo Neira Ayuso return -EINVAL;
7094139027SPablo Neira Ayuso
7194139027SPablo Neira Ayuso acct_name = nla_data(tb[NFACCT_NAME]);
72deadcfc3SPablo Neira Ayuso if (strlen(acct_name) == 0)
73deadcfc3SPablo Neira Ayuso return -EINVAL;
7494139027SPablo Neira Ayuso
75f7583f02SWang Shanker list_for_each_entry(nfacct, &nfnl_acct_net->nfnl_acct_list, head) {
7694139027SPablo Neira Ayuso if (strncmp(nfacct->name, acct_name, NFACCT_NAME_MAX) != 0)
7794139027SPablo Neira Ayuso continue;
7894139027SPablo Neira Ayuso
79a6555365SPablo Neira Ayuso if (info->nlh->nlmsg_flags & NLM_F_EXCL)
8094139027SPablo Neira Ayuso return -EEXIST;
8194139027SPablo Neira Ayuso
8294139027SPablo Neira Ayuso matching = nfacct;
8394139027SPablo Neira Ayuso break;
8494139027SPablo Neira Ayuso }
8594139027SPablo Neira Ayuso
8694139027SPablo Neira Ayuso if (matching) {
87a6555365SPablo Neira Ayuso if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
8894139027SPablo Neira Ayuso /* reset counters if you request a replacement. */
8994139027SPablo Neira Ayuso atomic64_set(&matching->pkts, 0);
9094139027SPablo Neira Ayuso atomic64_set(&matching->bytes, 0);
91f9da455bSLinus Torvalds smp_mb__before_atomic();
92683399edSMathieu Poirier /* reset overquota flag if quota is enabled. */
93683399edSMathieu Poirier if ((matching->flags & NFACCT_F_QUOTA))
94b6d04688SAlexey Perevalov clear_bit(NFACCT_OVERQUOTA_BIT,
95b6d04688SAlexey Perevalov &matching->flags);
9694139027SPablo Neira Ayuso return 0;
9794139027SPablo Neira Ayuso }
9894139027SPablo Neira Ayuso return -EBUSY;
9994139027SPablo Neira Ayuso }
10094139027SPablo Neira Ayuso
101683399edSMathieu Poirier if (tb[NFACCT_FLAGS]) {
102683399edSMathieu Poirier flags = ntohl(nla_get_be32(tb[NFACCT_FLAGS]));
103683399edSMathieu Poirier if (flags & ~NFACCT_F_QUOTA)
104683399edSMathieu Poirier return -EOPNOTSUPP;
105683399edSMathieu Poirier if ((flags & NFACCT_F_QUOTA) == NFACCT_F_QUOTA)
106683399edSMathieu Poirier return -EINVAL;
107683399edSMathieu Poirier if (flags & NFACCT_F_OVERQUOTA)
108683399edSMathieu Poirier return -EINVAL;
109eda3fc50SPhil Turnbull if ((flags & NFACCT_F_QUOTA) && !tb[NFACCT_QUOTA])
110eda3fc50SPhil Turnbull return -EINVAL;
111683399edSMathieu Poirier
112683399edSMathieu Poirier size += sizeof(u64);
113683399edSMathieu Poirier }
114683399edSMathieu Poirier
115683399edSMathieu Poirier nfacct = kzalloc(sizeof(struct nf_acct) + size, GFP_KERNEL);
11694139027SPablo Neira Ayuso if (nfacct == NULL)
11794139027SPablo Neira Ayuso return -ENOMEM;
11894139027SPablo Neira Ayuso
119683399edSMathieu Poirier if (flags & NFACCT_F_QUOTA) {
120683399edSMathieu Poirier u64 *quota = (u64 *)nfacct->data;
121683399edSMathieu Poirier
122683399edSMathieu Poirier *quota = be64_to_cpu(nla_get_be64(tb[NFACCT_QUOTA]));
123683399edSMathieu Poirier nfacct->flags = flags;
124683399edSMathieu Poirier }
125683399edSMathieu Poirier
126872f6903SFrancis Laniel nla_strscpy(nfacct->name, tb[NFACCT_NAME], NFACCT_NAME_MAX);
12794139027SPablo Neira Ayuso
12894139027SPablo Neira Ayuso if (tb[NFACCT_BYTES]) {
12994139027SPablo Neira Ayuso atomic64_set(&nfacct->bytes,
130fe31d1a8SPatrick McHardy be64_to_cpu(nla_get_be64(tb[NFACCT_BYTES])));
13194139027SPablo Neira Ayuso }
13294139027SPablo Neira Ayuso if (tb[NFACCT_PKTS]) {
13394139027SPablo Neira Ayuso atomic64_set(&nfacct->pkts,
134fe31d1a8SPatrick McHardy be64_to_cpu(nla_get_be64(tb[NFACCT_PKTS])));
13594139027SPablo Neira Ayuso }
136b54ab92bSReshetova, Elena refcount_set(&nfacct->refcnt, 1);
137f7583f02SWang Shanker list_add_tail_rcu(&nfacct->head, &nfnl_acct_net->nfnl_acct_list);
13894139027SPablo Neira Ayuso return 0;
13994139027SPablo Neira Ayuso }
14094139027SPablo Neira Ayuso
14194139027SPablo Neira Ayuso static int
nfnl_acct_fill_info(struct sk_buff * skb,u32 portid,u32 seq,u32 type,int event,struct nf_acct * acct)14215e47304SEric W. Biederman nfnl_acct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
14394139027SPablo Neira Ayuso int event, struct nf_acct *acct)
14494139027SPablo Neira Ayuso {
14594139027SPablo Neira Ayuso struct nlmsghdr *nlh;
14615e47304SEric W. Biederman unsigned int flags = portid ? NLM_F_MULTI : 0;
14794139027SPablo Neira Ayuso u64 pkts, bytes;
148d24675cbSAlexey Perevalov u32 old_flags;
14994139027SPablo Neira Ayuso
150dedb67c4SPablo Neira Ayuso event = nfnl_msg_type(NFNL_SUBSYS_ACCT, event);
15119c28b13SPablo Neira Ayuso nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
15219c28b13SPablo Neira Ayuso NFNETLINK_V0, 0);
15319c28b13SPablo Neira Ayuso if (!nlh)
15494139027SPablo Neira Ayuso goto nlmsg_failure;
15594139027SPablo Neira Ayuso
1567c801189SDavid S. Miller if (nla_put_string(skb, NFACCT_NAME, acct->name))
1577c801189SDavid S. Miller goto nla_put_failure;
15894139027SPablo Neira Ayuso
159d24675cbSAlexey Perevalov old_flags = acct->flags;
16094139027SPablo Neira Ayuso if (type == NFNL_MSG_ACCT_GET_CTRZERO) {
16194139027SPablo Neira Ayuso pkts = atomic64_xchg(&acct->pkts, 0);
16294139027SPablo Neira Ayuso bytes = atomic64_xchg(&acct->bytes, 0);
163f9da455bSLinus Torvalds smp_mb__before_atomic();
164683399edSMathieu Poirier if (acct->flags & NFACCT_F_QUOTA)
165b6d04688SAlexey Perevalov clear_bit(NFACCT_OVERQUOTA_BIT, &acct->flags);
16694139027SPablo Neira Ayuso } else {
16794139027SPablo Neira Ayuso pkts = atomic64_read(&acct->pkts);
16894139027SPablo Neira Ayuso bytes = atomic64_read(&acct->bytes);
16994139027SPablo Neira Ayuso }
170b46f6dedSNicolas Dichtel if (nla_put_be64(skb, NFACCT_PKTS, cpu_to_be64(pkts),
171b46f6dedSNicolas Dichtel NFACCT_PAD) ||
172b46f6dedSNicolas Dichtel nla_put_be64(skb, NFACCT_BYTES, cpu_to_be64(bytes),
173b46f6dedSNicolas Dichtel NFACCT_PAD) ||
174b54ab92bSReshetova, Elena nla_put_be32(skb, NFACCT_USE, htonl(refcount_read(&acct->refcnt))))
1757c801189SDavid S. Miller goto nla_put_failure;
176683399edSMathieu Poirier if (acct->flags & NFACCT_F_QUOTA) {
177683399edSMathieu Poirier u64 *quota = (u64 *)acct->data;
17894139027SPablo Neira Ayuso
179d24675cbSAlexey Perevalov if (nla_put_be32(skb, NFACCT_FLAGS, htonl(old_flags)) ||
180b46f6dedSNicolas Dichtel nla_put_be64(skb, NFACCT_QUOTA, cpu_to_be64(*quota),
181b46f6dedSNicolas Dichtel NFACCT_PAD))
182683399edSMathieu Poirier goto nla_put_failure;
183683399edSMathieu Poirier }
18494139027SPablo Neira Ayuso nlmsg_end(skb, nlh);
18594139027SPablo Neira Ayuso return skb->len;
18694139027SPablo Neira Ayuso
18794139027SPablo Neira Ayuso nlmsg_failure:
18894139027SPablo Neira Ayuso nla_put_failure:
18994139027SPablo Neira Ayuso nlmsg_cancel(skb, nlh);
19094139027SPablo Neira Ayuso return -1;
19194139027SPablo Neira Ayuso }
19294139027SPablo Neira Ayuso
19394139027SPablo Neira Ayuso static int
nfnl_acct_dump(struct sk_buff * skb,struct netlink_callback * cb)19494139027SPablo Neira Ayuso nfnl_acct_dump(struct sk_buff *skb, struct netlink_callback *cb)
19594139027SPablo Neira Ayuso {
1963499abb2SAndreas Schultz struct net *net = sock_net(skb->sk);
197f7583f02SWang Shanker struct nfnl_acct_net *nfnl_acct_net = nfnl_acct_pernet(net);
19894139027SPablo Neira Ayuso struct nf_acct *cur, *last;
199f111f780SAlexey Perevalov const struct nfacct_filter *filter = cb->data;
20094139027SPablo Neira Ayuso
20194139027SPablo Neira Ayuso if (cb->args[2])
20294139027SPablo Neira Ayuso return 0;
20394139027SPablo Neira Ayuso
20494139027SPablo Neira Ayuso last = (struct nf_acct *)cb->args[1];
20594139027SPablo Neira Ayuso if (cb->args[1])
20694139027SPablo Neira Ayuso cb->args[1] = 0;
20794139027SPablo Neira Ayuso
20894139027SPablo Neira Ayuso rcu_read_lock();
209f7583f02SWang Shanker list_for_each_entry_rcu(cur, &nfnl_acct_net->nfnl_acct_list, head) {
210991a6b73SPablo Neira Ayuso if (last) {
211991a6b73SPablo Neira Ayuso if (cur != last)
21294139027SPablo Neira Ayuso continue;
21394139027SPablo Neira Ayuso
214991a6b73SPablo Neira Ayuso last = NULL;
215991a6b73SPablo Neira Ayuso }
216f111f780SAlexey Perevalov
217f111f780SAlexey Perevalov if (filter && (cur->flags & filter->mask) != filter->value)
218f111f780SAlexey Perevalov continue;
219f111f780SAlexey Perevalov
22015e47304SEric W. Biederman if (nfnl_acct_fill_info(skb, NETLINK_CB(cb->skb).portid,
22194139027SPablo Neira Ayuso cb->nlh->nlmsg_seq,
22294139027SPablo Neira Ayuso NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
22394139027SPablo Neira Ayuso NFNL_MSG_ACCT_NEW, cur) < 0) {
22494139027SPablo Neira Ayuso cb->args[1] = (unsigned long)cur;
22594139027SPablo Neira Ayuso break;
22694139027SPablo Neira Ayuso }
22794139027SPablo Neira Ayuso }
22894139027SPablo Neira Ayuso if (!cb->args[1])
22994139027SPablo Neira Ayuso cb->args[2] = 1;
23094139027SPablo Neira Ayuso rcu_read_unlock();
23194139027SPablo Neira Ayuso return skb->len;
23294139027SPablo Neira Ayuso }
23394139027SPablo Neira Ayuso
nfnl_acct_done(struct netlink_callback * cb)234f111f780SAlexey Perevalov static int nfnl_acct_done(struct netlink_callback *cb)
235f111f780SAlexey Perevalov {
236f111f780SAlexey Perevalov kfree(cb->data);
237f111f780SAlexey Perevalov return 0;
238f111f780SAlexey Perevalov }
239f111f780SAlexey Perevalov
240f111f780SAlexey Perevalov static const struct nla_policy filter_policy[NFACCT_FILTER_MAX + 1] = {
241f111f780SAlexey Perevalov [NFACCT_FILTER_MASK] = { .type = NLA_U32 },
242f111f780SAlexey Perevalov [NFACCT_FILTER_VALUE] = { .type = NLA_U32 },
243f111f780SAlexey Perevalov };
244f111f780SAlexey Perevalov
nfnl_acct_start(struct netlink_callback * cb)2453e673b23SFlorian Westphal static int nfnl_acct_start(struct netlink_callback *cb)
246f111f780SAlexey Perevalov {
2473e673b23SFlorian Westphal const struct nlattr *const attr = cb->data;
248f111f780SAlexey Perevalov struct nlattr *tb[NFACCT_FILTER_MAX + 1];
2493e673b23SFlorian Westphal struct nfacct_filter *filter;
250f111f780SAlexey Perevalov int err;
251f111f780SAlexey Perevalov
2523e673b23SFlorian Westphal if (!attr)
2533e673b23SFlorian Westphal return 0;
2543e673b23SFlorian Westphal
2558cb08174SJohannes Berg err = nla_parse_nested_deprecated(tb, NFACCT_FILTER_MAX, attr,
2568cb08174SJohannes Berg filter_policy, NULL);
257f111f780SAlexey Perevalov if (err < 0)
2583e673b23SFlorian Westphal return err;
259f111f780SAlexey Perevalov
260017b1b6dSPhil Turnbull if (!tb[NFACCT_FILTER_MASK] || !tb[NFACCT_FILTER_VALUE])
2613e673b23SFlorian Westphal return -EINVAL;
262017b1b6dSPhil Turnbull
263f111f780SAlexey Perevalov filter = kzalloc(sizeof(struct nfacct_filter), GFP_KERNEL);
264f111f780SAlexey Perevalov if (!filter)
2653e673b23SFlorian Westphal return -ENOMEM;
266f111f780SAlexey Perevalov
267f111f780SAlexey Perevalov filter->mask = ntohl(nla_get_be32(tb[NFACCT_FILTER_MASK]));
268f111f780SAlexey Perevalov filter->value = ntohl(nla_get_be32(tb[NFACCT_FILTER_VALUE]));
2693e673b23SFlorian Westphal cb->data = filter;
270f111f780SAlexey Perevalov
2713e673b23SFlorian Westphal return 0;
272f111f780SAlexey Perevalov }
273f111f780SAlexey Perevalov
nfnl_acct_get(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const tb[])274a6555365SPablo Neira Ayuso static int nfnl_acct_get(struct sk_buff *skb, const struct nfnl_info *info,
275a6555365SPablo Neira Ayuso const struct nlattr * const tb[])
27694139027SPablo Neira Ayuso {
277a6555365SPablo Neira Ayuso struct nfnl_acct_net *nfnl_acct_net = nfnl_acct_pernet(info->net);
2783ab0b245SPablo Neira Ayuso int ret = -ENOENT;
27994139027SPablo Neira Ayuso struct nf_acct *cur;
28094139027SPablo Neira Ayuso char *acct_name;
28194139027SPablo Neira Ayuso
282a6555365SPablo Neira Ayuso if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
28380d326faSPablo Neira Ayuso struct netlink_dump_control c = {
28480d326faSPablo Neira Ayuso .dump = nfnl_acct_dump,
2853e673b23SFlorian Westphal .start = nfnl_acct_start,
286f111f780SAlexey Perevalov .done = nfnl_acct_done,
2873e673b23SFlorian Westphal .data = (void *)tb[NFACCT_FILTER],
28880d326faSPablo Neira Ayuso };
289f111f780SAlexey Perevalov
290a6555365SPablo Neira Ayuso return netlink_dump_start(info->sk, skb, info->nlh, &c);
29194139027SPablo Neira Ayuso }
29294139027SPablo Neira Ayuso
29394139027SPablo Neira Ayuso if (!tb[NFACCT_NAME])
29494139027SPablo Neira Ayuso return -EINVAL;
29594139027SPablo Neira Ayuso acct_name = nla_data(tb[NFACCT_NAME]);
29694139027SPablo Neira Ayuso
297f7583f02SWang Shanker list_for_each_entry(cur, &nfnl_acct_net->nfnl_acct_list, head) {
29894139027SPablo Neira Ayuso struct sk_buff *skb2;
29994139027SPablo Neira Ayuso
30094139027SPablo Neira Ayuso if (strncmp(cur->name, acct_name, NFACCT_NAME_MAX)!= 0)
30194139027SPablo Neira Ayuso continue;
30294139027SPablo Neira Ayuso
30394139027SPablo Neira Ayuso skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3043ab0b245SPablo Neira Ayuso if (skb2 == NULL) {
3053ab0b245SPablo Neira Ayuso ret = -ENOMEM;
30694139027SPablo Neira Ayuso break;
3073ab0b245SPablo Neira Ayuso }
30894139027SPablo Neira Ayuso
30915e47304SEric W. Biederman ret = nfnl_acct_fill_info(skb2, NETLINK_CB(skb).portid,
310a6555365SPablo Neira Ayuso info->nlh->nlmsg_seq,
311a6555365SPablo Neira Ayuso NFNL_MSG_TYPE(info->nlh->nlmsg_type),
31294139027SPablo Neira Ayuso NFNL_MSG_ACCT_NEW, cur);
3133ab0b245SPablo Neira Ayuso if (ret <= 0) {
31494139027SPablo Neira Ayuso kfree_skb(skb2);
31594139027SPablo Neira Ayuso break;
31694139027SPablo Neira Ayuso }
3173ab0b245SPablo Neira Ayuso
318*e0241ae6SPablo Neira Ayuso ret = nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
319*e0241ae6SPablo Neira Ayuso break;
3203ab0b245SPablo Neira Ayuso }
321*e0241ae6SPablo Neira Ayuso
32294139027SPablo Neira Ayuso return ret;
32394139027SPablo Neira Ayuso }
32494139027SPablo Neira Ayuso
32594139027SPablo Neira Ayuso /* try to delete object, fail if it is still in use. */
nfnl_acct_try_del(struct nf_acct * cur)32694139027SPablo Neira Ayuso static int nfnl_acct_try_del(struct nf_acct *cur)
32794139027SPablo Neira Ayuso {
32894139027SPablo Neira Ayuso int ret = 0;
32994139027SPablo Neira Ayuso
33012be15ddSLiping Zhang /* We want to avoid races with nfnl_acct_put. So only when the current
33112be15ddSLiping Zhang * refcnt is 1, we decrease it to 0.
33212be15ddSLiping Zhang */
333b54ab92bSReshetova, Elena if (refcount_dec_if_one(&cur->refcnt)) {
33494139027SPablo Neira Ayuso /* We are protected by nfnl mutex. */
33594139027SPablo Neira Ayuso list_del_rcu(&cur->head);
33694139027SPablo Neira Ayuso kfree_rcu(cur, rcu_head);
33794139027SPablo Neira Ayuso } else {
33894139027SPablo Neira Ayuso ret = -EBUSY;
33994139027SPablo Neira Ayuso }
34094139027SPablo Neira Ayuso return ret;
34194139027SPablo Neira Ayuso }
34294139027SPablo Neira Ayuso
nfnl_acct_del(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const tb[])343a6555365SPablo Neira Ayuso static int nfnl_acct_del(struct sk_buff *skb, const struct nfnl_info *info,
344a6555365SPablo Neira Ayuso const struct nlattr * const tb[])
34594139027SPablo Neira Ayuso {
346a6555365SPablo Neira Ayuso struct nfnl_acct_net *nfnl_acct_net = nfnl_acct_pernet(info->net);
34793fac10bSLiping Zhang struct nf_acct *cur, *tmp;
34894139027SPablo Neira Ayuso int ret = -ENOENT;
34993fac10bSLiping Zhang char *acct_name;
35094139027SPablo Neira Ayuso
35194139027SPablo Neira Ayuso if (!tb[NFACCT_NAME]) {
352f7583f02SWang Shanker list_for_each_entry_safe(cur, tmp, &nfnl_acct_net->nfnl_acct_list, head)
35394139027SPablo Neira Ayuso nfnl_acct_try_del(cur);
35494139027SPablo Neira Ayuso
35594139027SPablo Neira Ayuso return 0;
35694139027SPablo Neira Ayuso }
35794139027SPablo Neira Ayuso acct_name = nla_data(tb[NFACCT_NAME]);
35894139027SPablo Neira Ayuso
359f7583f02SWang Shanker list_for_each_entry(cur, &nfnl_acct_net->nfnl_acct_list, head) {
36094139027SPablo Neira Ayuso if (strncmp(cur->name, acct_name, NFACCT_NAME_MAX) != 0)
36194139027SPablo Neira Ayuso continue;
36294139027SPablo Neira Ayuso
36394139027SPablo Neira Ayuso ret = nfnl_acct_try_del(cur);
36494139027SPablo Neira Ayuso if (ret < 0)
36594139027SPablo Neira Ayuso return ret;
36694139027SPablo Neira Ayuso
36794139027SPablo Neira Ayuso break;
36894139027SPablo Neira Ayuso }
36994139027SPablo Neira Ayuso return ret;
37094139027SPablo Neira Ayuso }
37194139027SPablo Neira Ayuso
37294139027SPablo Neira Ayuso static const struct nla_policy nfnl_acct_policy[NFACCT_MAX+1] = {
37394139027SPablo Neira Ayuso [NFACCT_NAME] = { .type = NLA_NUL_STRING, .len = NFACCT_NAME_MAX-1 },
37494139027SPablo Neira Ayuso [NFACCT_BYTES] = { .type = NLA_U64 },
37594139027SPablo Neira Ayuso [NFACCT_PKTS] = { .type = NLA_U64 },
376683399edSMathieu Poirier [NFACCT_FLAGS] = { .type = NLA_U32 },
377683399edSMathieu Poirier [NFACCT_QUOTA] = { .type = NLA_U64 },
378f111f780SAlexey Perevalov [NFACCT_FILTER] = {.type = NLA_NESTED },
37994139027SPablo Neira Ayuso };
38094139027SPablo Neira Ayuso
38194139027SPablo Neira Ayuso static const struct nfnl_callback nfnl_acct_cb[NFNL_MSG_ACCT_MAX] = {
38250f2db9eSPablo Neira Ayuso [NFNL_MSG_ACCT_NEW] = {
38350f2db9eSPablo Neira Ayuso .call = nfnl_acct_new,
38450f2db9eSPablo Neira Ayuso .type = NFNL_CB_MUTEX,
38594139027SPablo Neira Ayuso .attr_count = NFACCT_MAX,
38650f2db9eSPablo Neira Ayuso .policy = nfnl_acct_policy
38750f2db9eSPablo Neira Ayuso },
38850f2db9eSPablo Neira Ayuso [NFNL_MSG_ACCT_GET] = {
38950f2db9eSPablo Neira Ayuso .call = nfnl_acct_get,
39050f2db9eSPablo Neira Ayuso .type = NFNL_CB_MUTEX,
39194139027SPablo Neira Ayuso .attr_count = NFACCT_MAX,
39250f2db9eSPablo Neira Ayuso .policy = nfnl_acct_policy
39350f2db9eSPablo Neira Ayuso },
39450f2db9eSPablo Neira Ayuso [NFNL_MSG_ACCT_GET_CTRZERO] = {
39550f2db9eSPablo Neira Ayuso .call = nfnl_acct_get,
39650f2db9eSPablo Neira Ayuso .type = NFNL_CB_MUTEX,
39794139027SPablo Neira Ayuso .attr_count = NFACCT_MAX,
39850f2db9eSPablo Neira Ayuso .policy = nfnl_acct_policy
39950f2db9eSPablo Neira Ayuso },
40050f2db9eSPablo Neira Ayuso [NFNL_MSG_ACCT_DEL] = {
40150f2db9eSPablo Neira Ayuso .call = nfnl_acct_del,
40250f2db9eSPablo Neira Ayuso .type = NFNL_CB_MUTEX,
40394139027SPablo Neira Ayuso .attr_count = NFACCT_MAX,
40450f2db9eSPablo Neira Ayuso .policy = nfnl_acct_policy
40550f2db9eSPablo Neira Ayuso },
40694139027SPablo Neira Ayuso };
40794139027SPablo Neira Ayuso
40894139027SPablo Neira Ayuso static const struct nfnetlink_subsystem nfnl_acct_subsys = {
40994139027SPablo Neira Ayuso .name = "acct",
41094139027SPablo Neira Ayuso .subsys_id = NFNL_SUBSYS_ACCT,
41194139027SPablo Neira Ayuso .cb_count = NFNL_MSG_ACCT_MAX,
41294139027SPablo Neira Ayuso .cb = nfnl_acct_cb,
41394139027SPablo Neira Ayuso };
41494139027SPablo Neira Ayuso
41594139027SPablo Neira Ayuso MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ACCT);
41694139027SPablo Neira Ayuso
nfnl_acct_find_get(struct net * net,const char * acct_name)4173499abb2SAndreas Schultz struct nf_acct *nfnl_acct_find_get(struct net *net, const char *acct_name)
41894139027SPablo Neira Ayuso {
419f7583f02SWang Shanker struct nfnl_acct_net *nfnl_acct_net = nfnl_acct_pernet(net);
42094139027SPablo Neira Ayuso struct nf_acct *cur, *acct = NULL;
42194139027SPablo Neira Ayuso
42294139027SPablo Neira Ayuso rcu_read_lock();
423f7583f02SWang Shanker list_for_each_entry_rcu(cur, &nfnl_acct_net->nfnl_acct_list, head) {
42494139027SPablo Neira Ayuso if (strncmp(cur->name, acct_name, NFACCT_NAME_MAX)!= 0)
42594139027SPablo Neira Ayuso continue;
42694139027SPablo Neira Ayuso
42794139027SPablo Neira Ayuso if (!try_module_get(THIS_MODULE))
42894139027SPablo Neira Ayuso goto err;
42994139027SPablo Neira Ayuso
430b54ab92bSReshetova, Elena if (!refcount_inc_not_zero(&cur->refcnt)) {
43194139027SPablo Neira Ayuso module_put(THIS_MODULE);
43294139027SPablo Neira Ayuso goto err;
43394139027SPablo Neira Ayuso }
43494139027SPablo Neira Ayuso
43594139027SPablo Neira Ayuso acct = cur;
43694139027SPablo Neira Ayuso break;
43794139027SPablo Neira Ayuso }
43894139027SPablo Neira Ayuso err:
43994139027SPablo Neira Ayuso rcu_read_unlock();
44094139027SPablo Neira Ayuso return acct;
44194139027SPablo Neira Ayuso }
44294139027SPablo Neira Ayuso EXPORT_SYMBOL_GPL(nfnl_acct_find_get);
44394139027SPablo Neira Ayuso
nfnl_acct_put(struct nf_acct * acct)44494139027SPablo Neira Ayuso void nfnl_acct_put(struct nf_acct *acct)
44594139027SPablo Neira Ayuso {
446b54ab92bSReshetova, Elena if (refcount_dec_and_test(&acct->refcnt))
4473499abb2SAndreas Schultz kfree_rcu(acct, rcu_head);
4483499abb2SAndreas Schultz
44994139027SPablo Neira Ayuso module_put(THIS_MODULE);
45094139027SPablo Neira Ayuso }
45194139027SPablo Neira Ayuso EXPORT_SYMBOL_GPL(nfnl_acct_put);
45294139027SPablo Neira Ayuso
nfnl_acct_update(const struct sk_buff * skb,struct nf_acct * nfacct)45394139027SPablo Neira Ayuso void nfnl_acct_update(const struct sk_buff *skb, struct nf_acct *nfacct)
45494139027SPablo Neira Ayuso {
45594139027SPablo Neira Ayuso atomic64_inc(&nfacct->pkts);
45694139027SPablo Neira Ayuso atomic64_add(skb->len, &nfacct->bytes);
45794139027SPablo Neira Ayuso }
45894139027SPablo Neira Ayuso EXPORT_SYMBOL_GPL(nfnl_acct_update);
45994139027SPablo Neira Ayuso
nfnl_overquota_report(struct net * net,struct nf_acct * nfacct)460aca30018SLiping Zhang static void nfnl_overquota_report(struct net *net, struct nf_acct *nfacct)
461683399edSMathieu Poirier {
462683399edSMathieu Poirier int ret;
463683399edSMathieu Poirier struct sk_buff *skb;
464683399edSMathieu Poirier
465683399edSMathieu Poirier skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
466683399edSMathieu Poirier if (skb == NULL)
467683399edSMathieu Poirier return;
468683399edSMathieu Poirier
469683399edSMathieu Poirier ret = nfnl_acct_fill_info(skb, 0, 0, NFNL_MSG_ACCT_OVERQUOTA, 0,
470683399edSMathieu Poirier nfacct);
471683399edSMathieu Poirier if (ret <= 0) {
472683399edSMathieu Poirier kfree_skb(skb);
473683399edSMathieu Poirier return;
474683399edSMathieu Poirier }
475237c609fSFlorian Westphal nfnetlink_broadcast(net, skb, 0, NFNLGRP_ACCT_QUOTA, GFP_ATOMIC);
476683399edSMathieu Poirier }
477683399edSMathieu Poirier
nfnl_acct_overquota(struct net * net,struct nf_acct * nfacct)478cceae76eSTaehee Yoo int nfnl_acct_overquota(struct net *net, struct nf_acct *nfacct)
479683399edSMathieu Poirier {
480683399edSMathieu Poirier u64 now;
481683399edSMathieu Poirier u64 *quota;
482683399edSMathieu Poirier int ret = NFACCT_UNDERQUOTA;
483683399edSMathieu Poirier
484683399edSMathieu Poirier /* no place here if we don't have a quota */
485683399edSMathieu Poirier if (!(nfacct->flags & NFACCT_F_QUOTA))
486683399edSMathieu Poirier return NFACCT_NO_QUOTA;
487683399edSMathieu Poirier
488683399edSMathieu Poirier quota = (u64 *)nfacct->data;
489683399edSMathieu Poirier now = (nfacct->flags & NFACCT_F_QUOTA_PKTS) ?
490683399edSMathieu Poirier atomic64_read(&nfacct->pkts) : atomic64_read(&nfacct->bytes);
491683399edSMathieu Poirier
492683399edSMathieu Poirier ret = now > *quota;
493683399edSMathieu Poirier
494683399edSMathieu Poirier if (now >= *quota &&
495b6d04688SAlexey Perevalov !test_and_set_bit(NFACCT_OVERQUOTA_BIT, &nfacct->flags)) {
496aca30018SLiping Zhang nfnl_overquota_report(net, nfacct);
497683399edSMathieu Poirier }
498683399edSMathieu Poirier
499683399edSMathieu Poirier return ret;
500683399edSMathieu Poirier }
501683399edSMathieu Poirier EXPORT_SYMBOL_GPL(nfnl_acct_overquota);
502683399edSMathieu Poirier
nfnl_acct_net_init(struct net * net)5033499abb2SAndreas Schultz static int __net_init nfnl_acct_net_init(struct net *net)
5043499abb2SAndreas Schultz {
505f7583f02SWang Shanker INIT_LIST_HEAD(&nfnl_acct_pernet(net)->nfnl_acct_list);
5063499abb2SAndreas Schultz
5073499abb2SAndreas Schultz return 0;
5083499abb2SAndreas Schultz }
5093499abb2SAndreas Schultz
nfnl_acct_net_exit(struct net * net)5103499abb2SAndreas Schultz static void __net_exit nfnl_acct_net_exit(struct net *net)
5113499abb2SAndreas Schultz {
512f7583f02SWang Shanker struct nfnl_acct_net *nfnl_acct_net = nfnl_acct_pernet(net);
5133499abb2SAndreas Schultz struct nf_acct *cur, *tmp;
5143499abb2SAndreas Schultz
515f7583f02SWang Shanker list_for_each_entry_safe(cur, tmp, &nfnl_acct_net->nfnl_acct_list, head) {
5163499abb2SAndreas Schultz list_del_rcu(&cur->head);
5173499abb2SAndreas Schultz
518b54ab92bSReshetova, Elena if (refcount_dec_and_test(&cur->refcnt))
5193499abb2SAndreas Schultz kfree_rcu(cur, rcu_head);
5203499abb2SAndreas Schultz }
5213499abb2SAndreas Schultz }
5223499abb2SAndreas Schultz
5233499abb2SAndreas Schultz static struct pernet_operations nfnl_acct_ops = {
5243499abb2SAndreas Schultz .init = nfnl_acct_net_init,
5253499abb2SAndreas Schultz .exit = nfnl_acct_net_exit,
526f7583f02SWang Shanker .id = &nfnl_acct_net_id,
527f7583f02SWang Shanker .size = sizeof(struct nfnl_acct_net),
5283499abb2SAndreas Schultz };
5293499abb2SAndreas Schultz
nfnl_acct_init(void)53094139027SPablo Neira Ayuso static int __init nfnl_acct_init(void)
53194139027SPablo Neira Ayuso {
53294139027SPablo Neira Ayuso int ret;
53394139027SPablo Neira Ayuso
5343499abb2SAndreas Schultz ret = register_pernet_subsys(&nfnl_acct_ops);
5353499abb2SAndreas Schultz if (ret < 0) {
5363499abb2SAndreas Schultz pr_err("nfnl_acct_init: failed to register pernet ops\n");
5373499abb2SAndreas Schultz goto err_out;
5383499abb2SAndreas Schultz }
5393499abb2SAndreas Schultz
54094139027SPablo Neira Ayuso ret = nfnetlink_subsys_register(&nfnl_acct_subsys);
54194139027SPablo Neira Ayuso if (ret < 0) {
54294139027SPablo Neira Ayuso pr_err("nfnl_acct_init: cannot register with nfnetlink.\n");
5433499abb2SAndreas Schultz goto cleanup_pernet;
54494139027SPablo Neira Ayuso }
54594139027SPablo Neira Ayuso return 0;
5463499abb2SAndreas Schultz
5473499abb2SAndreas Schultz cleanup_pernet:
5483499abb2SAndreas Schultz unregister_pernet_subsys(&nfnl_acct_ops);
54994139027SPablo Neira Ayuso err_out:
55094139027SPablo Neira Ayuso return ret;
55194139027SPablo Neira Ayuso }
55294139027SPablo Neira Ayuso
nfnl_acct_exit(void)55394139027SPablo Neira Ayuso static void __exit nfnl_acct_exit(void)
55494139027SPablo Neira Ayuso {
55594139027SPablo Neira Ayuso nfnetlink_subsys_unregister(&nfnl_acct_subsys);
5563499abb2SAndreas Schultz unregister_pernet_subsys(&nfnl_acct_ops);
55794139027SPablo Neira Ayuso }
55894139027SPablo Neira Ayuso
55994139027SPablo Neira Ayuso module_init(nfnl_acct_init);
56094139027SPablo Neira Ayuso module_exit(nfnl_acct_exit);
561