194139027SPablo Neira Ayuso /* 294139027SPablo Neira Ayuso * (C) 2011 Pablo Neira Ayuso <pablo@netfilter.org> 394139027SPablo Neira Ayuso * (C) 2011 Intra2net AG <http://www.intra2net.com> 494139027SPablo Neira Ayuso * 594139027SPablo Neira Ayuso * This program is free software; you can redistribute it and/or modify 694139027SPablo Neira Ayuso * it under the terms of the GNU General Public License version 2 as 794139027SPablo Neira Ayuso * published by the Free Software Foundation (or any later at your option). 894139027SPablo Neira Ayuso */ 994139027SPablo Neira Ayuso #include <linux/init.h> 1094139027SPablo Neira Ayuso #include <linux/module.h> 1194139027SPablo Neira Ayuso #include <linux/kernel.h> 1294139027SPablo Neira Ayuso #include <linux/skbuff.h> 136523cf9aSAndrew Morton #include <linux/atomic.h> 14b54ab92bSReshetova, Elena #include <linux/refcount.h> 1594139027SPablo Neira Ayuso #include <linux/netlink.h> 1694139027SPablo Neira Ayuso #include <linux/rculist.h> 1794139027SPablo Neira Ayuso #include <linux/slab.h> 1894139027SPablo Neira Ayuso #include <linux/types.h> 1994139027SPablo Neira Ayuso #include <linux/errno.h> 2094139027SPablo Neira Ayuso #include <net/netlink.h> 2194139027SPablo Neira Ayuso #include <net/sock.h> 2294139027SPablo Neira Ayuso 2394139027SPablo Neira Ayuso #include <linux/netfilter.h> 2494139027SPablo Neira Ayuso #include <linux/netfilter/nfnetlink.h> 2594139027SPablo Neira Ayuso #include <linux/netfilter/nfnetlink_acct.h> 2694139027SPablo Neira Ayuso 2794139027SPablo Neira Ayuso MODULE_LICENSE("GPL"); 2894139027SPablo Neira Ayuso MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); 2994139027SPablo Neira Ayuso MODULE_DESCRIPTION("nfacct: Extended Netfilter accounting infrastructure"); 3094139027SPablo Neira Ayuso 3194139027SPablo Neira Ayuso struct nf_acct { 3294139027SPablo Neira Ayuso atomic64_t pkts; 3394139027SPablo Neira Ayuso atomic64_t bytes; 34683399edSMathieu Poirier unsigned long flags; 3594139027SPablo Neira Ayuso struct list_head head; 36b54ab92bSReshetova, Elena refcount_t refcnt; 3794139027SPablo Neira Ayuso char name[NFACCT_NAME_MAX]; 3894139027SPablo Neira Ayuso struct rcu_head rcu_head; 39683399edSMathieu Poirier char data[0]; 4094139027SPablo Neira Ayuso }; 4194139027SPablo Neira Ayuso 42f111f780SAlexey Perevalov struct nfacct_filter { 43f111f780SAlexey Perevalov u32 value; 44f111f780SAlexey Perevalov u32 mask; 45f111f780SAlexey Perevalov }; 46f111f780SAlexey Perevalov 47683399edSMathieu Poirier #define NFACCT_F_QUOTA (NFACCT_F_QUOTA_PKTS | NFACCT_F_QUOTA_BYTES) 48b6d04688SAlexey Perevalov #define NFACCT_OVERQUOTA_BIT 2 /* NFACCT_F_OVERQUOTA */ 49683399edSMathieu Poirier 507b8002a1SPablo Neira Ayuso static int nfnl_acct_new(struct net *net, struct sock *nfnl, 517b8002a1SPablo Neira Ayuso struct sk_buff *skb, const struct nlmsghdr *nlh, 527b8002a1SPablo Neira Ayuso const struct nlattr * const tb[]) 5394139027SPablo Neira Ayuso { 5494139027SPablo Neira Ayuso struct nf_acct *nfacct, *matching = NULL; 5594139027SPablo Neira Ayuso char *acct_name; 56683399edSMathieu Poirier unsigned int size = 0; 57683399edSMathieu Poirier u32 flags = 0; 5894139027SPablo Neira Ayuso 5994139027SPablo Neira Ayuso if (!tb[NFACCT_NAME]) 6094139027SPablo Neira Ayuso return -EINVAL; 6194139027SPablo Neira Ayuso 6294139027SPablo Neira Ayuso acct_name = nla_data(tb[NFACCT_NAME]); 63deadcfc3SPablo Neira Ayuso if (strlen(acct_name) == 0) 64deadcfc3SPablo Neira Ayuso return -EINVAL; 6594139027SPablo Neira Ayuso 663499abb2SAndreas Schultz list_for_each_entry(nfacct, &net->nfnl_acct_list, head) { 6794139027SPablo Neira Ayuso if (strncmp(nfacct->name, acct_name, NFACCT_NAME_MAX) != 0) 6894139027SPablo Neira Ayuso continue; 6994139027SPablo Neira Ayuso 7094139027SPablo Neira Ayuso if (nlh->nlmsg_flags & NLM_F_EXCL) 7194139027SPablo Neira Ayuso return -EEXIST; 7294139027SPablo Neira Ayuso 7394139027SPablo Neira Ayuso matching = nfacct; 7494139027SPablo Neira Ayuso break; 7594139027SPablo Neira Ayuso } 7694139027SPablo Neira Ayuso 7794139027SPablo Neira Ayuso if (matching) { 7894139027SPablo Neira Ayuso if (nlh->nlmsg_flags & NLM_F_REPLACE) { 7994139027SPablo Neira Ayuso /* reset counters if you request a replacement. */ 8094139027SPablo Neira Ayuso atomic64_set(&matching->pkts, 0); 8194139027SPablo Neira Ayuso atomic64_set(&matching->bytes, 0); 82f9da455bSLinus Torvalds smp_mb__before_atomic(); 83683399edSMathieu Poirier /* reset overquota flag if quota is enabled. */ 84683399edSMathieu Poirier if ((matching->flags & NFACCT_F_QUOTA)) 85b6d04688SAlexey Perevalov clear_bit(NFACCT_OVERQUOTA_BIT, 86b6d04688SAlexey Perevalov &matching->flags); 8794139027SPablo Neira Ayuso return 0; 8894139027SPablo Neira Ayuso } 8994139027SPablo Neira Ayuso return -EBUSY; 9094139027SPablo Neira Ayuso } 9194139027SPablo Neira Ayuso 92683399edSMathieu Poirier if (tb[NFACCT_FLAGS]) { 93683399edSMathieu Poirier flags = ntohl(nla_get_be32(tb[NFACCT_FLAGS])); 94683399edSMathieu Poirier if (flags & ~NFACCT_F_QUOTA) 95683399edSMathieu Poirier return -EOPNOTSUPP; 96683399edSMathieu Poirier if ((flags & NFACCT_F_QUOTA) == NFACCT_F_QUOTA) 97683399edSMathieu Poirier return -EINVAL; 98683399edSMathieu Poirier if (flags & NFACCT_F_OVERQUOTA) 99683399edSMathieu Poirier return -EINVAL; 100eda3fc50SPhil Turnbull if ((flags & NFACCT_F_QUOTA) && !tb[NFACCT_QUOTA]) 101eda3fc50SPhil Turnbull return -EINVAL; 102683399edSMathieu Poirier 103683399edSMathieu Poirier size += sizeof(u64); 104683399edSMathieu Poirier } 105683399edSMathieu Poirier 106683399edSMathieu Poirier nfacct = kzalloc(sizeof(struct nf_acct) + size, GFP_KERNEL); 10794139027SPablo Neira Ayuso if (nfacct == NULL) 10894139027SPablo Neira Ayuso return -ENOMEM; 10994139027SPablo Neira Ayuso 110683399edSMathieu Poirier if (flags & NFACCT_F_QUOTA) { 111683399edSMathieu Poirier u64 *quota = (u64 *)nfacct->data; 112683399edSMathieu Poirier 113683399edSMathieu Poirier *quota = be64_to_cpu(nla_get_be64(tb[NFACCT_QUOTA])); 114683399edSMathieu Poirier nfacct->flags = flags; 115683399edSMathieu Poirier } 116683399edSMathieu Poirier 11794139027SPablo Neira Ayuso strncpy(nfacct->name, nla_data(tb[NFACCT_NAME]), NFACCT_NAME_MAX); 11894139027SPablo Neira Ayuso 11994139027SPablo Neira Ayuso if (tb[NFACCT_BYTES]) { 12094139027SPablo Neira Ayuso atomic64_set(&nfacct->bytes, 121fe31d1a8SPatrick McHardy be64_to_cpu(nla_get_be64(tb[NFACCT_BYTES]))); 12294139027SPablo Neira Ayuso } 12394139027SPablo Neira Ayuso if (tb[NFACCT_PKTS]) { 12494139027SPablo Neira Ayuso atomic64_set(&nfacct->pkts, 125fe31d1a8SPatrick McHardy be64_to_cpu(nla_get_be64(tb[NFACCT_PKTS]))); 12694139027SPablo Neira Ayuso } 127b54ab92bSReshetova, Elena refcount_set(&nfacct->refcnt, 1); 1283499abb2SAndreas Schultz list_add_tail_rcu(&nfacct->head, &net->nfnl_acct_list); 12994139027SPablo Neira Ayuso return 0; 13094139027SPablo Neira Ayuso } 13194139027SPablo Neira Ayuso 13294139027SPablo Neira Ayuso static int 13315e47304SEric W. Biederman nfnl_acct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, 13494139027SPablo Neira Ayuso int event, struct nf_acct *acct) 13594139027SPablo Neira Ayuso { 13694139027SPablo Neira Ayuso struct nlmsghdr *nlh; 13794139027SPablo Neira Ayuso struct nfgenmsg *nfmsg; 13815e47304SEric W. Biederman unsigned int flags = portid ? NLM_F_MULTI : 0; 13994139027SPablo Neira Ayuso u64 pkts, bytes; 140d24675cbSAlexey Perevalov u32 old_flags; 14194139027SPablo Neira Ayuso 142dedb67c4SPablo Neira Ayuso event = nfnl_msg_type(NFNL_SUBSYS_ACCT, event); 14315e47304SEric W. Biederman nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); 14494139027SPablo Neira Ayuso if (nlh == NULL) 14594139027SPablo Neira Ayuso goto nlmsg_failure; 14694139027SPablo Neira Ayuso 14794139027SPablo Neira Ayuso nfmsg = nlmsg_data(nlh); 14894139027SPablo Neira Ayuso nfmsg->nfgen_family = AF_UNSPEC; 14994139027SPablo Neira Ayuso nfmsg->version = NFNETLINK_V0; 15094139027SPablo Neira Ayuso nfmsg->res_id = 0; 15194139027SPablo Neira Ayuso 1527c801189SDavid S. Miller if (nla_put_string(skb, NFACCT_NAME, acct->name)) 1537c801189SDavid S. Miller goto nla_put_failure; 15494139027SPablo Neira Ayuso 155d24675cbSAlexey Perevalov old_flags = acct->flags; 15694139027SPablo Neira Ayuso if (type == NFNL_MSG_ACCT_GET_CTRZERO) { 15794139027SPablo Neira Ayuso pkts = atomic64_xchg(&acct->pkts, 0); 15894139027SPablo Neira Ayuso bytes = atomic64_xchg(&acct->bytes, 0); 159f9da455bSLinus Torvalds smp_mb__before_atomic(); 160683399edSMathieu Poirier if (acct->flags & NFACCT_F_QUOTA) 161b6d04688SAlexey Perevalov clear_bit(NFACCT_OVERQUOTA_BIT, &acct->flags); 16294139027SPablo Neira Ayuso } else { 16394139027SPablo Neira Ayuso pkts = atomic64_read(&acct->pkts); 16494139027SPablo Neira Ayuso bytes = atomic64_read(&acct->bytes); 16594139027SPablo Neira Ayuso } 166b46f6dedSNicolas Dichtel if (nla_put_be64(skb, NFACCT_PKTS, cpu_to_be64(pkts), 167b46f6dedSNicolas Dichtel NFACCT_PAD) || 168b46f6dedSNicolas Dichtel nla_put_be64(skb, NFACCT_BYTES, cpu_to_be64(bytes), 169b46f6dedSNicolas Dichtel NFACCT_PAD) || 170b54ab92bSReshetova, Elena nla_put_be32(skb, NFACCT_USE, htonl(refcount_read(&acct->refcnt)))) 1717c801189SDavid S. Miller goto nla_put_failure; 172683399edSMathieu Poirier if (acct->flags & NFACCT_F_QUOTA) { 173683399edSMathieu Poirier u64 *quota = (u64 *)acct->data; 17494139027SPablo Neira Ayuso 175d24675cbSAlexey Perevalov if (nla_put_be32(skb, NFACCT_FLAGS, htonl(old_flags)) || 176b46f6dedSNicolas Dichtel nla_put_be64(skb, NFACCT_QUOTA, cpu_to_be64(*quota), 177b46f6dedSNicolas Dichtel NFACCT_PAD)) 178683399edSMathieu Poirier goto nla_put_failure; 179683399edSMathieu Poirier } 18094139027SPablo Neira Ayuso nlmsg_end(skb, nlh); 18194139027SPablo Neira Ayuso return skb->len; 18294139027SPablo Neira Ayuso 18394139027SPablo Neira Ayuso nlmsg_failure: 18494139027SPablo Neira Ayuso nla_put_failure: 18594139027SPablo Neira Ayuso nlmsg_cancel(skb, nlh); 18694139027SPablo Neira Ayuso return -1; 18794139027SPablo Neira Ayuso } 18894139027SPablo Neira Ayuso 18994139027SPablo Neira Ayuso static int 19094139027SPablo Neira Ayuso nfnl_acct_dump(struct sk_buff *skb, struct netlink_callback *cb) 19194139027SPablo Neira Ayuso { 1923499abb2SAndreas Schultz struct net *net = sock_net(skb->sk); 19394139027SPablo Neira Ayuso struct nf_acct *cur, *last; 194f111f780SAlexey Perevalov const struct nfacct_filter *filter = cb->data; 19594139027SPablo Neira Ayuso 19694139027SPablo Neira Ayuso if (cb->args[2]) 19794139027SPablo Neira Ayuso return 0; 19894139027SPablo Neira Ayuso 19994139027SPablo Neira Ayuso last = (struct nf_acct *)cb->args[1]; 20094139027SPablo Neira Ayuso if (cb->args[1]) 20194139027SPablo Neira Ayuso cb->args[1] = 0; 20294139027SPablo Neira Ayuso 20394139027SPablo Neira Ayuso rcu_read_lock(); 2043499abb2SAndreas Schultz list_for_each_entry_rcu(cur, &net->nfnl_acct_list, head) { 205991a6b73SPablo Neira Ayuso if (last) { 206991a6b73SPablo Neira Ayuso if (cur != last) 20794139027SPablo Neira Ayuso continue; 20894139027SPablo Neira Ayuso 209991a6b73SPablo Neira Ayuso last = NULL; 210991a6b73SPablo Neira Ayuso } 211f111f780SAlexey Perevalov 212f111f780SAlexey Perevalov if (filter && (cur->flags & filter->mask) != filter->value) 213f111f780SAlexey Perevalov continue; 214f111f780SAlexey Perevalov 21515e47304SEric W. Biederman if (nfnl_acct_fill_info(skb, NETLINK_CB(cb->skb).portid, 21694139027SPablo Neira Ayuso cb->nlh->nlmsg_seq, 21794139027SPablo Neira Ayuso NFNL_MSG_TYPE(cb->nlh->nlmsg_type), 21894139027SPablo Neira Ayuso NFNL_MSG_ACCT_NEW, cur) < 0) { 21994139027SPablo Neira Ayuso cb->args[1] = (unsigned long)cur; 22094139027SPablo Neira Ayuso break; 22194139027SPablo Neira Ayuso } 22294139027SPablo Neira Ayuso } 22394139027SPablo Neira Ayuso if (!cb->args[1]) 22494139027SPablo Neira Ayuso cb->args[2] = 1; 22594139027SPablo Neira Ayuso rcu_read_unlock(); 22694139027SPablo Neira Ayuso return skb->len; 22794139027SPablo Neira Ayuso } 22894139027SPablo Neira Ayuso 229f111f780SAlexey Perevalov static int nfnl_acct_done(struct netlink_callback *cb) 230f111f780SAlexey Perevalov { 231f111f780SAlexey Perevalov kfree(cb->data); 232f111f780SAlexey Perevalov return 0; 233f111f780SAlexey Perevalov } 234f111f780SAlexey Perevalov 235f111f780SAlexey Perevalov static const struct nla_policy filter_policy[NFACCT_FILTER_MAX + 1] = { 236f111f780SAlexey Perevalov [NFACCT_FILTER_MASK] = { .type = NLA_U32 }, 237f111f780SAlexey Perevalov [NFACCT_FILTER_VALUE] = { .type = NLA_U32 }, 238f111f780SAlexey Perevalov }; 239f111f780SAlexey Perevalov 240f111f780SAlexey Perevalov static struct nfacct_filter * 241f111f780SAlexey Perevalov nfacct_filter_alloc(const struct nlattr * const attr) 242f111f780SAlexey Perevalov { 243f111f780SAlexey Perevalov struct nfacct_filter *filter; 244f111f780SAlexey Perevalov struct nlattr *tb[NFACCT_FILTER_MAX + 1]; 245f111f780SAlexey Perevalov int err; 246f111f780SAlexey Perevalov 247f111f780SAlexey Perevalov err = nla_parse_nested(tb, NFACCT_FILTER_MAX, attr, filter_policy); 248f111f780SAlexey Perevalov if (err < 0) 249f111f780SAlexey Perevalov return ERR_PTR(err); 250f111f780SAlexey Perevalov 251017b1b6dSPhil Turnbull if (!tb[NFACCT_FILTER_MASK] || !tb[NFACCT_FILTER_VALUE]) 252017b1b6dSPhil Turnbull return ERR_PTR(-EINVAL); 253017b1b6dSPhil Turnbull 254f111f780SAlexey Perevalov filter = kzalloc(sizeof(struct nfacct_filter), GFP_KERNEL); 255f111f780SAlexey Perevalov if (!filter) 256f111f780SAlexey Perevalov return ERR_PTR(-ENOMEM); 257f111f780SAlexey Perevalov 258f111f780SAlexey Perevalov filter->mask = ntohl(nla_get_be32(tb[NFACCT_FILTER_MASK])); 259f111f780SAlexey Perevalov filter->value = ntohl(nla_get_be32(tb[NFACCT_FILTER_VALUE])); 260f111f780SAlexey Perevalov 261f111f780SAlexey Perevalov return filter; 262f111f780SAlexey Perevalov } 263f111f780SAlexey Perevalov 2647b8002a1SPablo Neira Ayuso static int nfnl_acct_get(struct net *net, struct sock *nfnl, 2657b8002a1SPablo Neira Ayuso struct sk_buff *skb, const struct nlmsghdr *nlh, 2667b8002a1SPablo Neira Ayuso const struct nlattr * const tb[]) 26794139027SPablo Neira Ayuso { 2683ab0b245SPablo Neira Ayuso int ret = -ENOENT; 26994139027SPablo Neira Ayuso struct nf_acct *cur; 27094139027SPablo Neira Ayuso char *acct_name; 27194139027SPablo Neira Ayuso 27294139027SPablo Neira Ayuso if (nlh->nlmsg_flags & NLM_F_DUMP) { 27380d326faSPablo Neira Ayuso struct netlink_dump_control c = { 27480d326faSPablo Neira Ayuso .dump = nfnl_acct_dump, 275f111f780SAlexey Perevalov .done = nfnl_acct_done, 27680d326faSPablo Neira Ayuso }; 277f111f780SAlexey Perevalov 278f111f780SAlexey Perevalov if (tb[NFACCT_FILTER]) { 279f111f780SAlexey Perevalov struct nfacct_filter *filter; 280f111f780SAlexey Perevalov 281f111f780SAlexey Perevalov filter = nfacct_filter_alloc(tb[NFACCT_FILTER]); 282f111f780SAlexey Perevalov if (IS_ERR(filter)) 283f111f780SAlexey Perevalov return PTR_ERR(filter); 284f111f780SAlexey Perevalov 285f111f780SAlexey Perevalov c.data = filter; 286f111f780SAlexey Perevalov } 28780d326faSPablo Neira Ayuso return netlink_dump_start(nfnl, skb, nlh, &c); 28894139027SPablo Neira Ayuso } 28994139027SPablo Neira Ayuso 29094139027SPablo Neira Ayuso if (!tb[NFACCT_NAME]) 29194139027SPablo Neira Ayuso return -EINVAL; 29294139027SPablo Neira Ayuso acct_name = nla_data(tb[NFACCT_NAME]); 29394139027SPablo Neira Ayuso 2943499abb2SAndreas Schultz list_for_each_entry(cur, &net->nfnl_acct_list, head) { 29594139027SPablo Neira Ayuso struct sk_buff *skb2; 29694139027SPablo Neira Ayuso 29794139027SPablo Neira Ayuso if (strncmp(cur->name, acct_name, NFACCT_NAME_MAX)!= 0) 29894139027SPablo Neira Ayuso continue; 29994139027SPablo Neira Ayuso 30094139027SPablo Neira Ayuso skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 3013ab0b245SPablo Neira Ayuso if (skb2 == NULL) { 3023ab0b245SPablo Neira Ayuso ret = -ENOMEM; 30394139027SPablo Neira Ayuso break; 3043ab0b245SPablo Neira Ayuso } 30594139027SPablo Neira Ayuso 30615e47304SEric W. Biederman ret = nfnl_acct_fill_info(skb2, NETLINK_CB(skb).portid, 30794139027SPablo Neira Ayuso nlh->nlmsg_seq, 30894139027SPablo Neira Ayuso NFNL_MSG_TYPE(nlh->nlmsg_type), 30994139027SPablo Neira Ayuso NFNL_MSG_ACCT_NEW, cur); 3103ab0b245SPablo Neira Ayuso if (ret <= 0) { 31194139027SPablo Neira Ayuso kfree_skb(skb2); 31294139027SPablo Neira Ayuso break; 31394139027SPablo Neira Ayuso } 31415e47304SEric W. Biederman ret = netlink_unicast(nfnl, skb2, NETLINK_CB(skb).portid, 3153ab0b245SPablo Neira Ayuso MSG_DONTWAIT); 3163ab0b245SPablo Neira Ayuso if (ret > 0) 3173ab0b245SPablo Neira Ayuso ret = 0; 3183ab0b245SPablo Neira Ayuso 3193ab0b245SPablo Neira Ayuso /* this avoids a loop in nfnetlink. */ 3203ab0b245SPablo Neira Ayuso return ret == -EAGAIN ? -ENOBUFS : ret; 3213ab0b245SPablo 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. */ 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 3437b8002a1SPablo Neira Ayuso static int nfnl_acct_del(struct net *net, struct sock *nfnl, 3447b8002a1SPablo Neira Ayuso struct sk_buff *skb, const struct nlmsghdr *nlh, 3457b8002a1SPablo Neira Ayuso const struct nlattr * const tb[]) 34694139027SPablo Neira Ayuso { 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]) { 35293fac10bSLiping Zhang list_for_each_entry_safe(cur, tmp, &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 3593499abb2SAndreas Schultz list_for_each_entry(cur, &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] = { 38294139027SPablo Neira Ayuso [NFNL_MSG_ACCT_NEW] = { .call = nfnl_acct_new, 38394139027SPablo Neira Ayuso .attr_count = NFACCT_MAX, 38494139027SPablo Neira Ayuso .policy = nfnl_acct_policy }, 38594139027SPablo Neira Ayuso [NFNL_MSG_ACCT_GET] = { .call = nfnl_acct_get, 38694139027SPablo Neira Ayuso .attr_count = NFACCT_MAX, 38794139027SPablo Neira Ayuso .policy = nfnl_acct_policy }, 38894139027SPablo Neira Ayuso [NFNL_MSG_ACCT_GET_CTRZERO] = { .call = nfnl_acct_get, 38994139027SPablo Neira Ayuso .attr_count = NFACCT_MAX, 39094139027SPablo Neira Ayuso .policy = nfnl_acct_policy }, 39194139027SPablo Neira Ayuso [NFNL_MSG_ACCT_DEL] = { .call = nfnl_acct_del, 39294139027SPablo Neira Ayuso .attr_count = NFACCT_MAX, 39394139027SPablo Neira Ayuso .policy = nfnl_acct_policy }, 39494139027SPablo Neira Ayuso }; 39594139027SPablo Neira Ayuso 39694139027SPablo Neira Ayuso static const struct nfnetlink_subsystem nfnl_acct_subsys = { 39794139027SPablo Neira Ayuso .name = "acct", 39894139027SPablo Neira Ayuso .subsys_id = NFNL_SUBSYS_ACCT, 39994139027SPablo Neira Ayuso .cb_count = NFNL_MSG_ACCT_MAX, 40094139027SPablo Neira Ayuso .cb = nfnl_acct_cb, 40194139027SPablo Neira Ayuso }; 40294139027SPablo Neira Ayuso 40394139027SPablo Neira Ayuso MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ACCT); 40494139027SPablo Neira Ayuso 4053499abb2SAndreas Schultz struct nf_acct *nfnl_acct_find_get(struct net *net, const char *acct_name) 40694139027SPablo Neira Ayuso { 40794139027SPablo Neira Ayuso struct nf_acct *cur, *acct = NULL; 40894139027SPablo Neira Ayuso 40994139027SPablo Neira Ayuso rcu_read_lock(); 4103499abb2SAndreas Schultz list_for_each_entry_rcu(cur, &net->nfnl_acct_list, head) { 41194139027SPablo Neira Ayuso if (strncmp(cur->name, acct_name, NFACCT_NAME_MAX)!= 0) 41294139027SPablo Neira Ayuso continue; 41394139027SPablo Neira Ayuso 41494139027SPablo Neira Ayuso if (!try_module_get(THIS_MODULE)) 41594139027SPablo Neira Ayuso goto err; 41694139027SPablo Neira Ayuso 417b54ab92bSReshetova, Elena if (!refcount_inc_not_zero(&cur->refcnt)) { 41894139027SPablo Neira Ayuso module_put(THIS_MODULE); 41994139027SPablo Neira Ayuso goto err; 42094139027SPablo Neira Ayuso } 42194139027SPablo Neira Ayuso 42294139027SPablo Neira Ayuso acct = cur; 42394139027SPablo Neira Ayuso break; 42494139027SPablo Neira Ayuso } 42594139027SPablo Neira Ayuso err: 42694139027SPablo Neira Ayuso rcu_read_unlock(); 42794139027SPablo Neira Ayuso return acct; 42894139027SPablo Neira Ayuso } 42994139027SPablo Neira Ayuso EXPORT_SYMBOL_GPL(nfnl_acct_find_get); 43094139027SPablo Neira Ayuso 43194139027SPablo Neira Ayuso void nfnl_acct_put(struct nf_acct *acct) 43294139027SPablo Neira Ayuso { 433b54ab92bSReshetova, Elena if (refcount_dec_and_test(&acct->refcnt)) 4343499abb2SAndreas Schultz kfree_rcu(acct, rcu_head); 4353499abb2SAndreas Schultz 43694139027SPablo Neira Ayuso module_put(THIS_MODULE); 43794139027SPablo Neira Ayuso } 43894139027SPablo Neira Ayuso EXPORT_SYMBOL_GPL(nfnl_acct_put); 43994139027SPablo Neira Ayuso 44094139027SPablo Neira Ayuso void nfnl_acct_update(const struct sk_buff *skb, struct nf_acct *nfacct) 44194139027SPablo Neira Ayuso { 44294139027SPablo Neira Ayuso atomic64_inc(&nfacct->pkts); 44394139027SPablo Neira Ayuso atomic64_add(skb->len, &nfacct->bytes); 44494139027SPablo Neira Ayuso } 44594139027SPablo Neira Ayuso EXPORT_SYMBOL_GPL(nfnl_acct_update); 44694139027SPablo Neira Ayuso 447aca30018SLiping Zhang static void nfnl_overquota_report(struct net *net, struct nf_acct *nfacct) 448683399edSMathieu Poirier { 449683399edSMathieu Poirier int ret; 450683399edSMathieu Poirier struct sk_buff *skb; 451683399edSMathieu Poirier 452683399edSMathieu Poirier skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 453683399edSMathieu Poirier if (skb == NULL) 454683399edSMathieu Poirier return; 455683399edSMathieu Poirier 456683399edSMathieu Poirier ret = nfnl_acct_fill_info(skb, 0, 0, NFNL_MSG_ACCT_OVERQUOTA, 0, 457683399edSMathieu Poirier nfacct); 458683399edSMathieu Poirier if (ret <= 0) { 459683399edSMathieu Poirier kfree_skb(skb); 460683399edSMathieu Poirier return; 461683399edSMathieu Poirier } 462aca30018SLiping Zhang netlink_broadcast(net->nfnl, skb, 0, NFNLGRP_ACCT_QUOTA, 463683399edSMathieu Poirier GFP_ATOMIC); 464683399edSMathieu Poirier } 465683399edSMathieu Poirier 466aca30018SLiping Zhang int nfnl_acct_overquota(struct net *net, const struct sk_buff *skb, 467aca30018SLiping Zhang struct nf_acct *nfacct) 468683399edSMathieu Poirier { 469683399edSMathieu Poirier u64 now; 470683399edSMathieu Poirier u64 *quota; 471683399edSMathieu Poirier int ret = NFACCT_UNDERQUOTA; 472683399edSMathieu Poirier 473683399edSMathieu Poirier /* no place here if we don't have a quota */ 474683399edSMathieu Poirier if (!(nfacct->flags & NFACCT_F_QUOTA)) 475683399edSMathieu Poirier return NFACCT_NO_QUOTA; 476683399edSMathieu Poirier 477683399edSMathieu Poirier quota = (u64 *)nfacct->data; 478683399edSMathieu Poirier now = (nfacct->flags & NFACCT_F_QUOTA_PKTS) ? 479683399edSMathieu Poirier atomic64_read(&nfacct->pkts) : atomic64_read(&nfacct->bytes); 480683399edSMathieu Poirier 481683399edSMathieu Poirier ret = now > *quota; 482683399edSMathieu Poirier 483683399edSMathieu Poirier if (now >= *quota && 484b6d04688SAlexey Perevalov !test_and_set_bit(NFACCT_OVERQUOTA_BIT, &nfacct->flags)) { 485aca30018SLiping Zhang nfnl_overquota_report(net, nfacct); 486683399edSMathieu Poirier } 487683399edSMathieu Poirier 488683399edSMathieu Poirier return ret; 489683399edSMathieu Poirier } 490683399edSMathieu Poirier EXPORT_SYMBOL_GPL(nfnl_acct_overquota); 491683399edSMathieu Poirier 4923499abb2SAndreas Schultz static int __net_init nfnl_acct_net_init(struct net *net) 4933499abb2SAndreas Schultz { 4943499abb2SAndreas Schultz INIT_LIST_HEAD(&net->nfnl_acct_list); 4953499abb2SAndreas Schultz 4963499abb2SAndreas Schultz return 0; 4973499abb2SAndreas Schultz } 4983499abb2SAndreas Schultz 4993499abb2SAndreas Schultz static void __net_exit nfnl_acct_net_exit(struct net *net) 5003499abb2SAndreas Schultz { 5013499abb2SAndreas Schultz struct nf_acct *cur, *tmp; 5023499abb2SAndreas Schultz 5033499abb2SAndreas Schultz list_for_each_entry_safe(cur, tmp, &net->nfnl_acct_list, head) { 5043499abb2SAndreas Schultz list_del_rcu(&cur->head); 5053499abb2SAndreas Schultz 506b54ab92bSReshetova, Elena if (refcount_dec_and_test(&cur->refcnt)) 5073499abb2SAndreas Schultz kfree_rcu(cur, rcu_head); 5083499abb2SAndreas Schultz } 5093499abb2SAndreas Schultz } 5103499abb2SAndreas Schultz 5113499abb2SAndreas Schultz static struct pernet_operations nfnl_acct_ops = { 5123499abb2SAndreas Schultz .init = nfnl_acct_net_init, 5133499abb2SAndreas Schultz .exit = nfnl_acct_net_exit, 5143499abb2SAndreas Schultz }; 5153499abb2SAndreas Schultz 51694139027SPablo Neira Ayuso static int __init nfnl_acct_init(void) 51794139027SPablo Neira Ayuso { 51894139027SPablo Neira Ayuso int ret; 51994139027SPablo Neira Ayuso 5203499abb2SAndreas Schultz ret = register_pernet_subsys(&nfnl_acct_ops); 5213499abb2SAndreas Schultz if (ret < 0) { 5223499abb2SAndreas Schultz pr_err("nfnl_acct_init: failed to register pernet ops\n"); 5233499abb2SAndreas Schultz goto err_out; 5243499abb2SAndreas Schultz } 5253499abb2SAndreas Schultz 52694139027SPablo Neira Ayuso pr_info("nfnl_acct: registering with nfnetlink.\n"); 52794139027SPablo Neira Ayuso ret = nfnetlink_subsys_register(&nfnl_acct_subsys); 52894139027SPablo Neira Ayuso if (ret < 0) { 52994139027SPablo Neira Ayuso pr_err("nfnl_acct_init: cannot register with nfnetlink.\n"); 5303499abb2SAndreas Schultz goto cleanup_pernet; 53194139027SPablo Neira Ayuso } 53294139027SPablo Neira Ayuso return 0; 5333499abb2SAndreas Schultz 5343499abb2SAndreas Schultz cleanup_pernet: 5353499abb2SAndreas Schultz unregister_pernet_subsys(&nfnl_acct_ops); 53694139027SPablo Neira Ayuso err_out: 53794139027SPablo Neira Ayuso return ret; 53894139027SPablo Neira Ayuso } 53994139027SPablo Neira Ayuso 54094139027SPablo Neira Ayuso static void __exit nfnl_acct_exit(void) 54194139027SPablo Neira Ayuso { 54294139027SPablo Neira Ayuso pr_info("nfnl_acct: unregistering from nfnetlink.\n"); 54394139027SPablo Neira Ayuso nfnetlink_subsys_unregister(&nfnl_acct_subsys); 5443499abb2SAndreas Schultz unregister_pernet_subsys(&nfnl_acct_ops); 54594139027SPablo Neira Ayuso } 54694139027SPablo Neira Ayuso 54794139027SPablo Neira Ayuso module_init(nfnl_acct_init); 54894139027SPablo Neira Ayuso module_exit(nfnl_acct_exit); 549