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, 5204ba724bSPablo Neira Ayuso const struct nlattr * const tb[], 5304ba724bSPablo Neira Ayuso struct netlink_ext_ack *extack) 5494139027SPablo Neira Ayuso { 5594139027SPablo Neira Ayuso struct nf_acct *nfacct, *matching = NULL; 5694139027SPablo Neira Ayuso char *acct_name; 57683399edSMathieu Poirier unsigned int size = 0; 58683399edSMathieu Poirier u32 flags = 0; 5994139027SPablo Neira Ayuso 6094139027SPablo Neira Ayuso if (!tb[NFACCT_NAME]) 6194139027SPablo Neira Ayuso return -EINVAL; 6294139027SPablo Neira Ayuso 6394139027SPablo Neira Ayuso acct_name = nla_data(tb[NFACCT_NAME]); 64deadcfc3SPablo Neira Ayuso if (strlen(acct_name) == 0) 65deadcfc3SPablo Neira Ayuso return -EINVAL; 6694139027SPablo Neira Ayuso 673499abb2SAndreas Schultz list_for_each_entry(nfacct, &net->nfnl_acct_list, head) { 6894139027SPablo Neira Ayuso if (strncmp(nfacct->name, acct_name, NFACCT_NAME_MAX) != 0) 6994139027SPablo Neira Ayuso continue; 7094139027SPablo Neira Ayuso 7194139027SPablo Neira Ayuso if (nlh->nlmsg_flags & NLM_F_EXCL) 7294139027SPablo Neira Ayuso return -EEXIST; 7394139027SPablo Neira Ayuso 7494139027SPablo Neira Ayuso matching = nfacct; 7594139027SPablo Neira Ayuso break; 7694139027SPablo Neira Ayuso } 7794139027SPablo Neira Ayuso 7894139027SPablo Neira Ayuso if (matching) { 7994139027SPablo Neira Ayuso if (nlh->nlmsg_flags & NLM_F_REPLACE) { 8094139027SPablo Neira Ayuso /* reset counters if you request a replacement. */ 8194139027SPablo Neira Ayuso atomic64_set(&matching->pkts, 0); 8294139027SPablo Neira Ayuso atomic64_set(&matching->bytes, 0); 83f9da455bSLinus Torvalds smp_mb__before_atomic(); 84683399edSMathieu Poirier /* reset overquota flag if quota is enabled. */ 85683399edSMathieu Poirier if ((matching->flags & NFACCT_F_QUOTA)) 86b6d04688SAlexey Perevalov clear_bit(NFACCT_OVERQUOTA_BIT, 87b6d04688SAlexey Perevalov &matching->flags); 8894139027SPablo Neira Ayuso return 0; 8994139027SPablo Neira Ayuso } 9094139027SPablo Neira Ayuso return -EBUSY; 9194139027SPablo Neira Ayuso } 9294139027SPablo Neira Ayuso 93683399edSMathieu Poirier if (tb[NFACCT_FLAGS]) { 94683399edSMathieu Poirier flags = ntohl(nla_get_be32(tb[NFACCT_FLAGS])); 95683399edSMathieu Poirier if (flags & ~NFACCT_F_QUOTA) 96683399edSMathieu Poirier return -EOPNOTSUPP; 97683399edSMathieu Poirier if ((flags & NFACCT_F_QUOTA) == NFACCT_F_QUOTA) 98683399edSMathieu Poirier return -EINVAL; 99683399edSMathieu Poirier if (flags & NFACCT_F_OVERQUOTA) 100683399edSMathieu Poirier return -EINVAL; 101eda3fc50SPhil Turnbull if ((flags & NFACCT_F_QUOTA) && !tb[NFACCT_QUOTA]) 102eda3fc50SPhil Turnbull return -EINVAL; 103683399edSMathieu Poirier 104683399edSMathieu Poirier size += sizeof(u64); 105683399edSMathieu Poirier } 106683399edSMathieu Poirier 107683399edSMathieu Poirier nfacct = kzalloc(sizeof(struct nf_acct) + size, GFP_KERNEL); 10894139027SPablo Neira Ayuso if (nfacct == NULL) 10994139027SPablo Neira Ayuso return -ENOMEM; 11094139027SPablo Neira Ayuso 111683399edSMathieu Poirier if (flags & NFACCT_F_QUOTA) { 112683399edSMathieu Poirier u64 *quota = (u64 *)nfacct->data; 113683399edSMathieu Poirier 114683399edSMathieu Poirier *quota = be64_to_cpu(nla_get_be64(tb[NFACCT_QUOTA])); 115683399edSMathieu Poirier nfacct->flags = flags; 116683399edSMathieu Poirier } 117683399edSMathieu Poirier 1184b83a904SEric Dumazet nla_strlcpy(nfacct->name, tb[NFACCT_NAME], NFACCT_NAME_MAX); 11994139027SPablo Neira Ayuso 12094139027SPablo Neira Ayuso if (tb[NFACCT_BYTES]) { 12194139027SPablo Neira Ayuso atomic64_set(&nfacct->bytes, 122fe31d1a8SPatrick McHardy be64_to_cpu(nla_get_be64(tb[NFACCT_BYTES]))); 12394139027SPablo Neira Ayuso } 12494139027SPablo Neira Ayuso if (tb[NFACCT_PKTS]) { 12594139027SPablo Neira Ayuso atomic64_set(&nfacct->pkts, 126fe31d1a8SPatrick McHardy be64_to_cpu(nla_get_be64(tb[NFACCT_PKTS]))); 12794139027SPablo Neira Ayuso } 128b54ab92bSReshetova, Elena refcount_set(&nfacct->refcnt, 1); 1293499abb2SAndreas Schultz list_add_tail_rcu(&nfacct->head, &net->nfnl_acct_list); 13094139027SPablo Neira Ayuso return 0; 13194139027SPablo Neira Ayuso } 13294139027SPablo Neira Ayuso 13394139027SPablo Neira Ayuso static int 13415e47304SEric W. Biederman nfnl_acct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, 13594139027SPablo Neira Ayuso int event, struct nf_acct *acct) 13694139027SPablo Neira Ayuso { 13794139027SPablo Neira Ayuso struct nlmsghdr *nlh; 13894139027SPablo Neira Ayuso struct nfgenmsg *nfmsg; 13915e47304SEric W. Biederman unsigned int flags = portid ? NLM_F_MULTI : 0; 14094139027SPablo Neira Ayuso u64 pkts, bytes; 141d24675cbSAlexey Perevalov u32 old_flags; 14294139027SPablo Neira Ayuso 143dedb67c4SPablo Neira Ayuso event = nfnl_msg_type(NFNL_SUBSYS_ACCT, event); 14415e47304SEric W. Biederman nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); 14594139027SPablo Neira Ayuso if (nlh == NULL) 14694139027SPablo Neira Ayuso goto nlmsg_failure; 14794139027SPablo Neira Ayuso 14894139027SPablo Neira Ayuso nfmsg = nlmsg_data(nlh); 14994139027SPablo Neira Ayuso nfmsg->nfgen_family = AF_UNSPEC; 15094139027SPablo Neira Ayuso nfmsg->version = NFNETLINK_V0; 15194139027SPablo Neira Ayuso nfmsg->res_id = 0; 15294139027SPablo Neira Ayuso 1537c801189SDavid S. Miller if (nla_put_string(skb, NFACCT_NAME, acct->name)) 1547c801189SDavid S. Miller goto nla_put_failure; 15594139027SPablo Neira Ayuso 156d24675cbSAlexey Perevalov old_flags = acct->flags; 15794139027SPablo Neira Ayuso if (type == NFNL_MSG_ACCT_GET_CTRZERO) { 15894139027SPablo Neira Ayuso pkts = atomic64_xchg(&acct->pkts, 0); 15994139027SPablo Neira Ayuso bytes = atomic64_xchg(&acct->bytes, 0); 160f9da455bSLinus Torvalds smp_mb__before_atomic(); 161683399edSMathieu Poirier if (acct->flags & NFACCT_F_QUOTA) 162b6d04688SAlexey Perevalov clear_bit(NFACCT_OVERQUOTA_BIT, &acct->flags); 16394139027SPablo Neira Ayuso } else { 16494139027SPablo Neira Ayuso pkts = atomic64_read(&acct->pkts); 16594139027SPablo Neira Ayuso bytes = atomic64_read(&acct->bytes); 16694139027SPablo Neira Ayuso } 167b46f6dedSNicolas Dichtel if (nla_put_be64(skb, NFACCT_PKTS, cpu_to_be64(pkts), 168b46f6dedSNicolas Dichtel NFACCT_PAD) || 169b46f6dedSNicolas Dichtel nla_put_be64(skb, NFACCT_BYTES, cpu_to_be64(bytes), 170b46f6dedSNicolas Dichtel NFACCT_PAD) || 171b54ab92bSReshetova, Elena nla_put_be32(skb, NFACCT_USE, htonl(refcount_read(&acct->refcnt)))) 1727c801189SDavid S. Miller goto nla_put_failure; 173683399edSMathieu Poirier if (acct->flags & NFACCT_F_QUOTA) { 174683399edSMathieu Poirier u64 *quota = (u64 *)acct->data; 17594139027SPablo Neira Ayuso 176d24675cbSAlexey Perevalov if (nla_put_be32(skb, NFACCT_FLAGS, htonl(old_flags)) || 177b46f6dedSNicolas Dichtel nla_put_be64(skb, NFACCT_QUOTA, cpu_to_be64(*quota), 178b46f6dedSNicolas Dichtel NFACCT_PAD)) 179683399edSMathieu Poirier goto nla_put_failure; 180683399edSMathieu Poirier } 18194139027SPablo Neira Ayuso nlmsg_end(skb, nlh); 18294139027SPablo Neira Ayuso return skb->len; 18394139027SPablo Neira Ayuso 18494139027SPablo Neira Ayuso nlmsg_failure: 18594139027SPablo Neira Ayuso nla_put_failure: 18694139027SPablo Neira Ayuso nlmsg_cancel(skb, nlh); 18794139027SPablo Neira Ayuso return -1; 18894139027SPablo Neira Ayuso } 18994139027SPablo Neira Ayuso 19094139027SPablo Neira Ayuso static int 19194139027SPablo Neira Ayuso nfnl_acct_dump(struct sk_buff *skb, struct netlink_callback *cb) 19294139027SPablo Neira Ayuso { 1933499abb2SAndreas Schultz struct net *net = sock_net(skb->sk); 19494139027SPablo Neira Ayuso struct nf_acct *cur, *last; 195f111f780SAlexey Perevalov const struct nfacct_filter *filter = cb->data; 19694139027SPablo Neira Ayuso 19794139027SPablo Neira Ayuso if (cb->args[2]) 19894139027SPablo Neira Ayuso return 0; 19994139027SPablo Neira Ayuso 20094139027SPablo Neira Ayuso last = (struct nf_acct *)cb->args[1]; 20194139027SPablo Neira Ayuso if (cb->args[1]) 20294139027SPablo Neira Ayuso cb->args[1] = 0; 20394139027SPablo Neira Ayuso 20494139027SPablo Neira Ayuso rcu_read_lock(); 2053499abb2SAndreas Schultz list_for_each_entry_rcu(cur, &net->nfnl_acct_list, head) { 206991a6b73SPablo Neira Ayuso if (last) { 207991a6b73SPablo Neira Ayuso if (cur != last) 20894139027SPablo Neira Ayuso continue; 20994139027SPablo Neira Ayuso 210991a6b73SPablo Neira Ayuso last = NULL; 211991a6b73SPablo Neira Ayuso } 212f111f780SAlexey Perevalov 213f111f780SAlexey Perevalov if (filter && (cur->flags & filter->mask) != filter->value) 214f111f780SAlexey Perevalov continue; 215f111f780SAlexey Perevalov 21615e47304SEric W. Biederman if (nfnl_acct_fill_info(skb, NETLINK_CB(cb->skb).portid, 21794139027SPablo Neira Ayuso cb->nlh->nlmsg_seq, 21894139027SPablo Neira Ayuso NFNL_MSG_TYPE(cb->nlh->nlmsg_type), 21994139027SPablo Neira Ayuso NFNL_MSG_ACCT_NEW, cur) < 0) { 22094139027SPablo Neira Ayuso cb->args[1] = (unsigned long)cur; 22194139027SPablo Neira Ayuso break; 22294139027SPablo Neira Ayuso } 22394139027SPablo Neira Ayuso } 22494139027SPablo Neira Ayuso if (!cb->args[1]) 22594139027SPablo Neira Ayuso cb->args[2] = 1; 22694139027SPablo Neira Ayuso rcu_read_unlock(); 22794139027SPablo Neira Ayuso return skb->len; 22894139027SPablo Neira Ayuso } 22994139027SPablo Neira Ayuso 230f111f780SAlexey Perevalov static int nfnl_acct_done(struct netlink_callback *cb) 231f111f780SAlexey Perevalov { 232f111f780SAlexey Perevalov kfree(cb->data); 233f111f780SAlexey Perevalov return 0; 234f111f780SAlexey Perevalov } 235f111f780SAlexey Perevalov 236f111f780SAlexey Perevalov static const struct nla_policy filter_policy[NFACCT_FILTER_MAX + 1] = { 237f111f780SAlexey Perevalov [NFACCT_FILTER_MASK] = { .type = NLA_U32 }, 238f111f780SAlexey Perevalov [NFACCT_FILTER_VALUE] = { .type = NLA_U32 }, 239f111f780SAlexey Perevalov }; 240f111f780SAlexey Perevalov 241f111f780SAlexey Perevalov static struct nfacct_filter * 242f111f780SAlexey Perevalov nfacct_filter_alloc(const struct nlattr * const attr) 243f111f780SAlexey Perevalov { 244f111f780SAlexey Perevalov struct nfacct_filter *filter; 245f111f780SAlexey Perevalov struct nlattr *tb[NFACCT_FILTER_MAX + 1]; 246f111f780SAlexey Perevalov int err; 247f111f780SAlexey Perevalov 248fceb6435SJohannes Berg err = nla_parse_nested(tb, NFACCT_FILTER_MAX, attr, filter_policy, 249fceb6435SJohannes Berg NULL); 250f111f780SAlexey Perevalov if (err < 0) 251f111f780SAlexey Perevalov return ERR_PTR(err); 252f111f780SAlexey Perevalov 253017b1b6dSPhil Turnbull if (!tb[NFACCT_FILTER_MASK] || !tb[NFACCT_FILTER_VALUE]) 254017b1b6dSPhil Turnbull return ERR_PTR(-EINVAL); 255017b1b6dSPhil Turnbull 256f111f780SAlexey Perevalov filter = kzalloc(sizeof(struct nfacct_filter), GFP_KERNEL); 257f111f780SAlexey Perevalov if (!filter) 258f111f780SAlexey Perevalov return ERR_PTR(-ENOMEM); 259f111f780SAlexey Perevalov 260f111f780SAlexey Perevalov filter->mask = ntohl(nla_get_be32(tb[NFACCT_FILTER_MASK])); 261f111f780SAlexey Perevalov filter->value = ntohl(nla_get_be32(tb[NFACCT_FILTER_VALUE])); 262f111f780SAlexey Perevalov 263f111f780SAlexey Perevalov return filter; 264f111f780SAlexey Perevalov } 265f111f780SAlexey Perevalov 2667b8002a1SPablo Neira Ayuso static int nfnl_acct_get(struct net *net, struct sock *nfnl, 2677b8002a1SPablo Neira Ayuso struct sk_buff *skb, const struct nlmsghdr *nlh, 26804ba724bSPablo Neira Ayuso const struct nlattr * const tb[], 26904ba724bSPablo Neira Ayuso struct netlink_ext_ack *extack) 27094139027SPablo Neira Ayuso { 2713ab0b245SPablo Neira Ayuso int ret = -ENOENT; 27294139027SPablo Neira Ayuso struct nf_acct *cur; 27394139027SPablo Neira Ayuso char *acct_name; 27494139027SPablo Neira Ayuso 27594139027SPablo Neira Ayuso if (nlh->nlmsg_flags & NLM_F_DUMP) { 27680d326faSPablo Neira Ayuso struct netlink_dump_control c = { 27780d326faSPablo Neira Ayuso .dump = nfnl_acct_dump, 278f111f780SAlexey Perevalov .done = nfnl_acct_done, 27980d326faSPablo Neira Ayuso }; 280f111f780SAlexey Perevalov 281f111f780SAlexey Perevalov if (tb[NFACCT_FILTER]) { 282f111f780SAlexey Perevalov struct nfacct_filter *filter; 283f111f780SAlexey Perevalov 284f111f780SAlexey Perevalov filter = nfacct_filter_alloc(tb[NFACCT_FILTER]); 285f111f780SAlexey Perevalov if (IS_ERR(filter)) 286f111f780SAlexey Perevalov return PTR_ERR(filter); 287f111f780SAlexey Perevalov 288f111f780SAlexey Perevalov c.data = filter; 289f111f780SAlexey Perevalov } 29080d326faSPablo Neira Ayuso return netlink_dump_start(nfnl, skb, 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 2973499abb2SAndreas Schultz list_for_each_entry(cur, &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, 31094139027SPablo Neira Ayuso nlh->nlmsg_seq, 31194139027SPablo Neira Ayuso NFNL_MSG_TYPE(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 } 31715e47304SEric W. Biederman ret = netlink_unicast(nfnl, skb2, NETLINK_CB(skb).portid, 3183ab0b245SPablo Neira Ayuso MSG_DONTWAIT); 3193ab0b245SPablo Neira Ayuso if (ret > 0) 3203ab0b245SPablo Neira Ayuso ret = 0; 3213ab0b245SPablo Neira Ayuso 3223ab0b245SPablo Neira Ayuso /* this avoids a loop in nfnetlink. */ 3233ab0b245SPablo Neira Ayuso return ret == -EAGAIN ? -ENOBUFS : ret; 3243ab0b245SPablo Neira Ayuso } 32594139027SPablo Neira Ayuso return ret; 32694139027SPablo Neira Ayuso } 32794139027SPablo Neira Ayuso 32894139027SPablo Neira Ayuso /* try to delete object, fail if it is still in use. */ 32994139027SPablo Neira Ayuso static int nfnl_acct_try_del(struct nf_acct *cur) 33094139027SPablo Neira Ayuso { 33194139027SPablo Neira Ayuso int ret = 0; 33294139027SPablo Neira Ayuso 33312be15ddSLiping Zhang /* We want to avoid races with nfnl_acct_put. So only when the current 33412be15ddSLiping Zhang * refcnt is 1, we decrease it to 0. 33512be15ddSLiping Zhang */ 336b54ab92bSReshetova, Elena if (refcount_dec_if_one(&cur->refcnt)) { 33794139027SPablo Neira Ayuso /* We are protected by nfnl mutex. */ 33894139027SPablo Neira Ayuso list_del_rcu(&cur->head); 33994139027SPablo Neira Ayuso kfree_rcu(cur, rcu_head); 34094139027SPablo Neira Ayuso } else { 34194139027SPablo Neira Ayuso ret = -EBUSY; 34294139027SPablo Neira Ayuso } 34394139027SPablo Neira Ayuso return ret; 34494139027SPablo Neira Ayuso } 34594139027SPablo Neira Ayuso 3467b8002a1SPablo Neira Ayuso static int nfnl_acct_del(struct net *net, struct sock *nfnl, 3477b8002a1SPablo Neira Ayuso struct sk_buff *skb, const struct nlmsghdr *nlh, 34804ba724bSPablo Neira Ayuso const struct nlattr * const tb[], 34904ba724bSPablo Neira Ayuso struct netlink_ext_ack *extack) 35094139027SPablo Neira Ayuso { 35193fac10bSLiping Zhang struct nf_acct *cur, *tmp; 35294139027SPablo Neira Ayuso int ret = -ENOENT; 35393fac10bSLiping Zhang char *acct_name; 35494139027SPablo Neira Ayuso 35594139027SPablo Neira Ayuso if (!tb[NFACCT_NAME]) { 35693fac10bSLiping Zhang list_for_each_entry_safe(cur, tmp, &net->nfnl_acct_list, head) 35794139027SPablo Neira Ayuso nfnl_acct_try_del(cur); 35894139027SPablo Neira Ayuso 35994139027SPablo Neira Ayuso return 0; 36094139027SPablo Neira Ayuso } 36194139027SPablo Neira Ayuso acct_name = nla_data(tb[NFACCT_NAME]); 36294139027SPablo Neira Ayuso 3633499abb2SAndreas Schultz list_for_each_entry(cur, &net->nfnl_acct_list, head) { 36494139027SPablo Neira Ayuso if (strncmp(cur->name, acct_name, NFACCT_NAME_MAX) != 0) 36594139027SPablo Neira Ayuso continue; 36694139027SPablo Neira Ayuso 36794139027SPablo Neira Ayuso ret = nfnl_acct_try_del(cur); 36894139027SPablo Neira Ayuso if (ret < 0) 36994139027SPablo Neira Ayuso return ret; 37094139027SPablo Neira Ayuso 37194139027SPablo Neira Ayuso break; 37294139027SPablo Neira Ayuso } 37394139027SPablo Neira Ayuso return ret; 37494139027SPablo Neira Ayuso } 37594139027SPablo Neira Ayuso 37694139027SPablo Neira Ayuso static const struct nla_policy nfnl_acct_policy[NFACCT_MAX+1] = { 37794139027SPablo Neira Ayuso [NFACCT_NAME] = { .type = NLA_NUL_STRING, .len = NFACCT_NAME_MAX-1 }, 37894139027SPablo Neira Ayuso [NFACCT_BYTES] = { .type = NLA_U64 }, 37994139027SPablo Neira Ayuso [NFACCT_PKTS] = { .type = NLA_U64 }, 380683399edSMathieu Poirier [NFACCT_FLAGS] = { .type = NLA_U32 }, 381683399edSMathieu Poirier [NFACCT_QUOTA] = { .type = NLA_U64 }, 382f111f780SAlexey Perevalov [NFACCT_FILTER] = {.type = NLA_NESTED }, 38394139027SPablo Neira Ayuso }; 38494139027SPablo Neira Ayuso 38594139027SPablo Neira Ayuso static const struct nfnl_callback nfnl_acct_cb[NFNL_MSG_ACCT_MAX] = { 38694139027SPablo Neira Ayuso [NFNL_MSG_ACCT_NEW] = { .call = nfnl_acct_new, 38794139027SPablo Neira Ayuso .attr_count = NFACCT_MAX, 38894139027SPablo Neira Ayuso .policy = nfnl_acct_policy }, 38994139027SPablo Neira Ayuso [NFNL_MSG_ACCT_GET] = { .call = nfnl_acct_get, 39094139027SPablo Neira Ayuso .attr_count = NFACCT_MAX, 39194139027SPablo Neira Ayuso .policy = nfnl_acct_policy }, 39294139027SPablo Neira Ayuso [NFNL_MSG_ACCT_GET_CTRZERO] = { .call = nfnl_acct_get, 39394139027SPablo Neira Ayuso .attr_count = NFACCT_MAX, 39494139027SPablo Neira Ayuso .policy = nfnl_acct_policy }, 39594139027SPablo Neira Ayuso [NFNL_MSG_ACCT_DEL] = { .call = nfnl_acct_del, 39694139027SPablo Neira Ayuso .attr_count = NFACCT_MAX, 39794139027SPablo Neira Ayuso .policy = nfnl_acct_policy }, 39894139027SPablo Neira Ayuso }; 39994139027SPablo Neira Ayuso 40094139027SPablo Neira Ayuso static const struct nfnetlink_subsystem nfnl_acct_subsys = { 40194139027SPablo Neira Ayuso .name = "acct", 40294139027SPablo Neira Ayuso .subsys_id = NFNL_SUBSYS_ACCT, 40394139027SPablo Neira Ayuso .cb_count = NFNL_MSG_ACCT_MAX, 40494139027SPablo Neira Ayuso .cb = nfnl_acct_cb, 40594139027SPablo Neira Ayuso }; 40694139027SPablo Neira Ayuso 40794139027SPablo Neira Ayuso MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ACCT); 40894139027SPablo Neira Ayuso 4093499abb2SAndreas Schultz struct nf_acct *nfnl_acct_find_get(struct net *net, const char *acct_name) 41094139027SPablo Neira Ayuso { 41194139027SPablo Neira Ayuso struct nf_acct *cur, *acct = NULL; 41294139027SPablo Neira Ayuso 41394139027SPablo Neira Ayuso rcu_read_lock(); 4143499abb2SAndreas Schultz list_for_each_entry_rcu(cur, &net->nfnl_acct_list, head) { 41594139027SPablo Neira Ayuso if (strncmp(cur->name, acct_name, NFACCT_NAME_MAX)!= 0) 41694139027SPablo Neira Ayuso continue; 41794139027SPablo Neira Ayuso 41894139027SPablo Neira Ayuso if (!try_module_get(THIS_MODULE)) 41994139027SPablo Neira Ayuso goto err; 42094139027SPablo Neira Ayuso 421b54ab92bSReshetova, Elena if (!refcount_inc_not_zero(&cur->refcnt)) { 42294139027SPablo Neira Ayuso module_put(THIS_MODULE); 42394139027SPablo Neira Ayuso goto err; 42494139027SPablo Neira Ayuso } 42594139027SPablo Neira Ayuso 42694139027SPablo Neira Ayuso acct = cur; 42794139027SPablo Neira Ayuso break; 42894139027SPablo Neira Ayuso } 42994139027SPablo Neira Ayuso err: 43094139027SPablo Neira Ayuso rcu_read_unlock(); 43194139027SPablo Neira Ayuso return acct; 43294139027SPablo Neira Ayuso } 43394139027SPablo Neira Ayuso EXPORT_SYMBOL_GPL(nfnl_acct_find_get); 43494139027SPablo Neira Ayuso 43594139027SPablo Neira Ayuso void nfnl_acct_put(struct nf_acct *acct) 43694139027SPablo Neira Ayuso { 437b54ab92bSReshetova, Elena if (refcount_dec_and_test(&acct->refcnt)) 4383499abb2SAndreas Schultz kfree_rcu(acct, rcu_head); 4393499abb2SAndreas Schultz 44094139027SPablo Neira Ayuso module_put(THIS_MODULE); 44194139027SPablo Neira Ayuso } 44294139027SPablo Neira Ayuso EXPORT_SYMBOL_GPL(nfnl_acct_put); 44394139027SPablo Neira Ayuso 44494139027SPablo Neira Ayuso void nfnl_acct_update(const struct sk_buff *skb, struct nf_acct *nfacct) 44594139027SPablo Neira Ayuso { 44694139027SPablo Neira Ayuso atomic64_inc(&nfacct->pkts); 44794139027SPablo Neira Ayuso atomic64_add(skb->len, &nfacct->bytes); 44894139027SPablo Neira Ayuso } 44994139027SPablo Neira Ayuso EXPORT_SYMBOL_GPL(nfnl_acct_update); 45094139027SPablo Neira Ayuso 451aca30018SLiping Zhang static void nfnl_overquota_report(struct net *net, struct nf_acct *nfacct) 452683399edSMathieu Poirier { 453683399edSMathieu Poirier int ret; 454683399edSMathieu Poirier struct sk_buff *skb; 455683399edSMathieu Poirier 456683399edSMathieu Poirier skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 457683399edSMathieu Poirier if (skb == NULL) 458683399edSMathieu Poirier return; 459683399edSMathieu Poirier 460683399edSMathieu Poirier ret = nfnl_acct_fill_info(skb, 0, 0, NFNL_MSG_ACCT_OVERQUOTA, 0, 461683399edSMathieu Poirier nfacct); 462683399edSMathieu Poirier if (ret <= 0) { 463683399edSMathieu Poirier kfree_skb(skb); 464683399edSMathieu Poirier return; 465683399edSMathieu Poirier } 466aca30018SLiping Zhang netlink_broadcast(net->nfnl, skb, 0, NFNLGRP_ACCT_QUOTA, 467683399edSMathieu Poirier GFP_ATOMIC); 468683399edSMathieu Poirier } 469683399edSMathieu Poirier 470cceae76eSTaehee Yoo int nfnl_acct_overquota(struct net *net, struct nf_acct *nfacct) 471683399edSMathieu Poirier { 472683399edSMathieu Poirier u64 now; 473683399edSMathieu Poirier u64 *quota; 474683399edSMathieu Poirier int ret = NFACCT_UNDERQUOTA; 475683399edSMathieu Poirier 476683399edSMathieu Poirier /* no place here if we don't have a quota */ 477683399edSMathieu Poirier if (!(nfacct->flags & NFACCT_F_QUOTA)) 478683399edSMathieu Poirier return NFACCT_NO_QUOTA; 479683399edSMathieu Poirier 480683399edSMathieu Poirier quota = (u64 *)nfacct->data; 481683399edSMathieu Poirier now = (nfacct->flags & NFACCT_F_QUOTA_PKTS) ? 482683399edSMathieu Poirier atomic64_read(&nfacct->pkts) : atomic64_read(&nfacct->bytes); 483683399edSMathieu Poirier 484683399edSMathieu Poirier ret = now > *quota; 485683399edSMathieu Poirier 486683399edSMathieu Poirier if (now >= *quota && 487b6d04688SAlexey Perevalov !test_and_set_bit(NFACCT_OVERQUOTA_BIT, &nfacct->flags)) { 488aca30018SLiping Zhang nfnl_overquota_report(net, nfacct); 489683399edSMathieu Poirier } 490683399edSMathieu Poirier 491683399edSMathieu Poirier return ret; 492683399edSMathieu Poirier } 493683399edSMathieu Poirier EXPORT_SYMBOL_GPL(nfnl_acct_overquota); 494683399edSMathieu Poirier 4953499abb2SAndreas Schultz static int __net_init nfnl_acct_net_init(struct net *net) 4963499abb2SAndreas Schultz { 4973499abb2SAndreas Schultz INIT_LIST_HEAD(&net->nfnl_acct_list); 4983499abb2SAndreas Schultz 4993499abb2SAndreas Schultz return 0; 5003499abb2SAndreas Schultz } 5013499abb2SAndreas Schultz 5023499abb2SAndreas Schultz static void __net_exit nfnl_acct_net_exit(struct net *net) 5033499abb2SAndreas Schultz { 5043499abb2SAndreas Schultz struct nf_acct *cur, *tmp; 5053499abb2SAndreas Schultz 5063499abb2SAndreas Schultz list_for_each_entry_safe(cur, tmp, &net->nfnl_acct_list, head) { 5073499abb2SAndreas Schultz list_del_rcu(&cur->head); 5083499abb2SAndreas Schultz 509b54ab92bSReshetova, Elena if (refcount_dec_and_test(&cur->refcnt)) 5103499abb2SAndreas Schultz kfree_rcu(cur, rcu_head); 5113499abb2SAndreas Schultz } 5123499abb2SAndreas Schultz } 5133499abb2SAndreas Schultz 5143499abb2SAndreas Schultz static struct pernet_operations nfnl_acct_ops = { 5153499abb2SAndreas Schultz .init = nfnl_acct_net_init, 5163499abb2SAndreas Schultz .exit = nfnl_acct_net_exit, 5173499abb2SAndreas Schultz }; 5183499abb2SAndreas Schultz 51994139027SPablo Neira Ayuso static int __init nfnl_acct_init(void) 52094139027SPablo Neira Ayuso { 52194139027SPablo Neira Ayuso int ret; 52294139027SPablo Neira Ayuso 5233499abb2SAndreas Schultz ret = register_pernet_subsys(&nfnl_acct_ops); 5243499abb2SAndreas Schultz if (ret < 0) { 5253499abb2SAndreas Schultz pr_err("nfnl_acct_init: failed to register pernet ops\n"); 5263499abb2SAndreas Schultz goto err_out; 5273499abb2SAndreas Schultz } 5283499abb2SAndreas Schultz 52994139027SPablo Neira Ayuso ret = nfnetlink_subsys_register(&nfnl_acct_subsys); 53094139027SPablo Neira Ayuso if (ret < 0) { 53194139027SPablo Neira Ayuso pr_err("nfnl_acct_init: cannot register with nfnetlink.\n"); 5323499abb2SAndreas Schultz goto cleanup_pernet; 53394139027SPablo Neira Ayuso } 53494139027SPablo Neira Ayuso return 0; 5353499abb2SAndreas Schultz 5363499abb2SAndreas Schultz cleanup_pernet: 5373499abb2SAndreas Schultz unregister_pernet_subsys(&nfnl_acct_ops); 53894139027SPablo Neira Ayuso err_out: 53994139027SPablo Neira Ayuso return ret; 54094139027SPablo Neira Ayuso } 54194139027SPablo Neira Ayuso 54294139027SPablo Neira Ayuso static void __exit nfnl_acct_exit(void) 54394139027SPablo Neira Ayuso { 54494139027SPablo Neira Ayuso nfnetlink_subsys_unregister(&nfnl_acct_subsys); 5453499abb2SAndreas Schultz unregister_pernet_subsys(&nfnl_acct_ops); 54694139027SPablo Neira Ayuso } 54794139027SPablo Neira Ayuso 54894139027SPablo Neira Ayuso module_init(nfnl_acct_init); 54994139027SPablo Neira Ayuso module_exit(nfnl_acct_exit); 550