Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 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> |
Andrew Morton | 6523cf9 | 2012-03-28 12:10:57 +0000 | [diff] [blame] | 13 | #include <linux/atomic.h> |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 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> |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 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 | |
| 30 | static LIST_HEAD(nfnl_acct_list); |
| 31 | |
| 32 | struct nf_acct { |
| 33 | atomic64_t pkts; |
| 34 | atomic64_t bytes; |
Mathieu Poirier | 683399e | 2014-04-20 18:57:36 -0600 | [diff] [blame] | 35 | unsigned long flags; |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 36 | struct list_head head; |
| 37 | atomic_t refcnt; |
| 38 | char name[NFACCT_NAME_MAX]; |
| 39 | struct rcu_head rcu_head; |
Mathieu Poirier | 683399e | 2014-04-20 18:57:36 -0600 | [diff] [blame] | 40 | char data[0]; |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 41 | }; |
| 42 | |
Alexey Perevalov | f111f78 | 2014-08-20 22:03:18 +0400 | [diff] [blame] | 43 | struct nfacct_filter { |
| 44 | u32 value; |
| 45 | u32 mask; |
| 46 | }; |
| 47 | |
Mathieu Poirier | 683399e | 2014-04-20 18:57:36 -0600 | [diff] [blame] | 48 | #define NFACCT_F_QUOTA (NFACCT_F_QUOTA_PKTS | NFACCT_F_QUOTA_BYTES) |
Alexey Perevalov | b6d0468 | 2014-07-31 17:14:05 +0400 | [diff] [blame] | 49 | #define NFACCT_OVERQUOTA_BIT 2 /* NFACCT_F_OVERQUOTA */ |
Mathieu Poirier | 683399e | 2014-04-20 18:57:36 -0600 | [diff] [blame] | 50 | |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 51 | static int |
| 52 | nfnl_acct_new(struct sock *nfnl, struct sk_buff *skb, |
| 53 | const struct nlmsghdr *nlh, const struct nlattr * const tb[]) |
| 54 | { |
| 55 | struct nf_acct *nfacct, *matching = NULL; |
| 56 | char *acct_name; |
Mathieu Poirier | 683399e | 2014-04-20 18:57:36 -0600 | [diff] [blame] | 57 | unsigned int size = 0; |
| 58 | u32 flags = 0; |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 59 | |
| 60 | if (!tb[NFACCT_NAME]) |
| 61 | return -EINVAL; |
| 62 | |
| 63 | acct_name = nla_data(tb[NFACCT_NAME]); |
Pablo Neira Ayuso | deadcfc | 2013-03-23 16:57:59 +0100 | [diff] [blame] | 64 | if (strlen(acct_name) == 0) |
| 65 | return -EINVAL; |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 66 | |
| 67 | list_for_each_entry(nfacct, &nfnl_acct_list, head) { |
| 68 | if (strncmp(nfacct->name, acct_name, NFACCT_NAME_MAX) != 0) |
| 69 | continue; |
| 70 | |
| 71 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
| 72 | return -EEXIST; |
| 73 | |
| 74 | matching = nfacct; |
| 75 | break; |
| 76 | } |
| 77 | |
| 78 | if (matching) { |
| 79 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
| 80 | /* reset counters if you request a replacement. */ |
| 81 | atomic64_set(&matching->pkts, 0); |
| 82 | atomic64_set(&matching->bytes, 0); |
Linus Torvalds | f9da455 | 2014-06-12 14:27:40 -0700 | [diff] [blame] | 83 | smp_mb__before_atomic(); |
Mathieu Poirier | 683399e | 2014-04-20 18:57:36 -0600 | [diff] [blame] | 84 | /* reset overquota flag if quota is enabled. */ |
| 85 | if ((matching->flags & NFACCT_F_QUOTA)) |
Alexey Perevalov | b6d0468 | 2014-07-31 17:14:05 +0400 | [diff] [blame] | 86 | clear_bit(NFACCT_OVERQUOTA_BIT, |
| 87 | &matching->flags); |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 88 | return 0; |
| 89 | } |
| 90 | return -EBUSY; |
| 91 | } |
| 92 | |
Mathieu Poirier | 683399e | 2014-04-20 18:57:36 -0600 | [diff] [blame] | 93 | if (tb[NFACCT_FLAGS]) { |
| 94 | flags = ntohl(nla_get_be32(tb[NFACCT_FLAGS])); |
| 95 | if (flags & ~NFACCT_F_QUOTA) |
| 96 | return -EOPNOTSUPP; |
| 97 | if ((flags & NFACCT_F_QUOTA) == NFACCT_F_QUOTA) |
| 98 | return -EINVAL; |
| 99 | if (flags & NFACCT_F_OVERQUOTA) |
| 100 | return -EINVAL; |
| 101 | |
| 102 | size += sizeof(u64); |
| 103 | } |
| 104 | |
| 105 | nfacct = kzalloc(sizeof(struct nf_acct) + size, GFP_KERNEL); |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 106 | if (nfacct == NULL) |
| 107 | return -ENOMEM; |
| 108 | |
Mathieu Poirier | 683399e | 2014-04-20 18:57:36 -0600 | [diff] [blame] | 109 | if (flags & NFACCT_F_QUOTA) { |
| 110 | u64 *quota = (u64 *)nfacct->data; |
| 111 | |
| 112 | *quota = be64_to_cpu(nla_get_be64(tb[NFACCT_QUOTA])); |
| 113 | nfacct->flags = flags; |
| 114 | } |
| 115 | |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 116 | strncpy(nfacct->name, nla_data(tb[NFACCT_NAME]), NFACCT_NAME_MAX); |
| 117 | |
| 118 | if (tb[NFACCT_BYTES]) { |
| 119 | atomic64_set(&nfacct->bytes, |
Patrick McHardy | fe31d1a | 2012-08-19 10:16:09 +0000 | [diff] [blame] | 120 | be64_to_cpu(nla_get_be64(tb[NFACCT_BYTES]))); |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 121 | } |
| 122 | if (tb[NFACCT_PKTS]) { |
| 123 | atomic64_set(&nfacct->pkts, |
Patrick McHardy | fe31d1a | 2012-08-19 10:16:09 +0000 | [diff] [blame] | 124 | be64_to_cpu(nla_get_be64(tb[NFACCT_PKTS]))); |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 125 | } |
| 126 | atomic_set(&nfacct->refcnt, 1); |
| 127 | list_add_tail_rcu(&nfacct->head, &nfnl_acct_list); |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | static int |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 132 | nfnl_acct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 133 | int event, struct nf_acct *acct) |
| 134 | { |
| 135 | struct nlmsghdr *nlh; |
| 136 | struct nfgenmsg *nfmsg; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 137 | unsigned int flags = portid ? NLM_F_MULTI : 0; |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 138 | u64 pkts, bytes; |
Alexey Perevalov | d24675c | 2014-07-30 19:17:55 +0400 | [diff] [blame] | 139 | u32 old_flags; |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 140 | |
| 141 | event |= NFNL_SUBSYS_ACCT << 8; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 142 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 143 | if (nlh == NULL) |
| 144 | goto nlmsg_failure; |
| 145 | |
| 146 | nfmsg = nlmsg_data(nlh); |
| 147 | nfmsg->nfgen_family = AF_UNSPEC; |
| 148 | nfmsg->version = NFNETLINK_V0; |
| 149 | nfmsg->res_id = 0; |
| 150 | |
David S. Miller | 7c80118 | 2012-04-01 18:46:29 -0400 | [diff] [blame] | 151 | if (nla_put_string(skb, NFACCT_NAME, acct->name)) |
| 152 | goto nla_put_failure; |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 153 | |
Alexey Perevalov | d24675c | 2014-07-30 19:17:55 +0400 | [diff] [blame] | 154 | old_flags = acct->flags; |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 155 | if (type == NFNL_MSG_ACCT_GET_CTRZERO) { |
| 156 | pkts = atomic64_xchg(&acct->pkts, 0); |
| 157 | bytes = atomic64_xchg(&acct->bytes, 0); |
Linus Torvalds | f9da455 | 2014-06-12 14:27:40 -0700 | [diff] [blame] | 158 | smp_mb__before_atomic(); |
Mathieu Poirier | 683399e | 2014-04-20 18:57:36 -0600 | [diff] [blame] | 159 | if (acct->flags & NFACCT_F_QUOTA) |
Alexey Perevalov | b6d0468 | 2014-07-31 17:14:05 +0400 | [diff] [blame] | 160 | clear_bit(NFACCT_OVERQUOTA_BIT, &acct->flags); |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 161 | } else { |
| 162 | pkts = atomic64_read(&acct->pkts); |
| 163 | bytes = atomic64_read(&acct->bytes); |
| 164 | } |
David S. Miller | 7c80118 | 2012-04-01 18:46:29 -0400 | [diff] [blame] | 165 | if (nla_put_be64(skb, NFACCT_PKTS, cpu_to_be64(pkts)) || |
| 166 | nla_put_be64(skb, NFACCT_BYTES, cpu_to_be64(bytes)) || |
| 167 | nla_put_be32(skb, NFACCT_USE, htonl(atomic_read(&acct->refcnt)))) |
| 168 | goto nla_put_failure; |
Mathieu Poirier | 683399e | 2014-04-20 18:57:36 -0600 | [diff] [blame] | 169 | if (acct->flags & NFACCT_F_QUOTA) { |
| 170 | u64 *quota = (u64 *)acct->data; |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 171 | |
Alexey Perevalov | d24675c | 2014-07-30 19:17:55 +0400 | [diff] [blame] | 172 | if (nla_put_be32(skb, NFACCT_FLAGS, htonl(old_flags)) || |
Mathieu Poirier | 683399e | 2014-04-20 18:57:36 -0600 | [diff] [blame] | 173 | nla_put_be64(skb, NFACCT_QUOTA, cpu_to_be64(*quota))) |
| 174 | goto nla_put_failure; |
| 175 | } |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 176 | nlmsg_end(skb, nlh); |
| 177 | return skb->len; |
| 178 | |
| 179 | nlmsg_failure: |
| 180 | nla_put_failure: |
| 181 | nlmsg_cancel(skb, nlh); |
| 182 | return -1; |
| 183 | } |
| 184 | |
| 185 | static int |
| 186 | nfnl_acct_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 187 | { |
| 188 | struct nf_acct *cur, *last; |
Alexey Perevalov | f111f78 | 2014-08-20 22:03:18 +0400 | [diff] [blame] | 189 | const struct nfacct_filter *filter = cb->data; |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 190 | |
| 191 | if (cb->args[2]) |
| 192 | return 0; |
| 193 | |
| 194 | last = (struct nf_acct *)cb->args[1]; |
| 195 | if (cb->args[1]) |
| 196 | cb->args[1] = 0; |
| 197 | |
| 198 | rcu_read_lock(); |
| 199 | list_for_each_entry_rcu(cur, &nfnl_acct_list, head) { |
Pablo Neira Ayuso | 991a6b7 | 2013-06-01 15:31:40 +0200 | [diff] [blame] | 200 | if (last) { |
| 201 | if (cur != last) |
| 202 | continue; |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 203 | |
Pablo Neira Ayuso | 991a6b7 | 2013-06-01 15:31:40 +0200 | [diff] [blame] | 204 | last = NULL; |
| 205 | } |
Alexey Perevalov | f111f78 | 2014-08-20 22:03:18 +0400 | [diff] [blame] | 206 | |
| 207 | if (filter && (cur->flags & filter->mask) != filter->value) |
| 208 | continue; |
| 209 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 210 | if (nfnl_acct_fill_info(skb, NETLINK_CB(cb->skb).portid, |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 211 | cb->nlh->nlmsg_seq, |
| 212 | NFNL_MSG_TYPE(cb->nlh->nlmsg_type), |
| 213 | NFNL_MSG_ACCT_NEW, cur) < 0) { |
| 214 | cb->args[1] = (unsigned long)cur; |
| 215 | break; |
| 216 | } |
| 217 | } |
| 218 | if (!cb->args[1]) |
| 219 | cb->args[2] = 1; |
| 220 | rcu_read_unlock(); |
| 221 | return skb->len; |
| 222 | } |
| 223 | |
Alexey Perevalov | f111f78 | 2014-08-20 22:03:18 +0400 | [diff] [blame] | 224 | static int nfnl_acct_done(struct netlink_callback *cb) |
| 225 | { |
| 226 | kfree(cb->data); |
| 227 | return 0; |
| 228 | } |
| 229 | |
| 230 | static const struct nla_policy filter_policy[NFACCT_FILTER_MAX + 1] = { |
| 231 | [NFACCT_FILTER_MASK] = { .type = NLA_U32 }, |
| 232 | [NFACCT_FILTER_VALUE] = { .type = NLA_U32 }, |
| 233 | }; |
| 234 | |
| 235 | static struct nfacct_filter * |
| 236 | nfacct_filter_alloc(const struct nlattr * const attr) |
| 237 | { |
| 238 | struct nfacct_filter *filter; |
| 239 | struct nlattr *tb[NFACCT_FILTER_MAX + 1]; |
| 240 | int err; |
| 241 | |
| 242 | err = nla_parse_nested(tb, NFACCT_FILTER_MAX, attr, filter_policy); |
| 243 | if (err < 0) |
| 244 | return ERR_PTR(err); |
| 245 | |
| 246 | filter = kzalloc(sizeof(struct nfacct_filter), GFP_KERNEL); |
| 247 | if (!filter) |
| 248 | return ERR_PTR(-ENOMEM); |
| 249 | |
| 250 | filter->mask = ntohl(nla_get_be32(tb[NFACCT_FILTER_MASK])); |
| 251 | filter->value = ntohl(nla_get_be32(tb[NFACCT_FILTER_VALUE])); |
| 252 | |
| 253 | return filter; |
| 254 | } |
| 255 | |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 256 | static int |
| 257 | nfnl_acct_get(struct sock *nfnl, struct sk_buff *skb, |
| 258 | const struct nlmsghdr *nlh, const struct nlattr * const tb[]) |
| 259 | { |
Pablo Neira Ayuso | 3ab0b24 | 2011-12-30 20:32:26 +0100 | [diff] [blame] | 260 | int ret = -ENOENT; |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 261 | struct nf_acct *cur; |
| 262 | char *acct_name; |
| 263 | |
| 264 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
Pablo Neira Ayuso | 80d326f | 2012-02-24 14:30:15 +0000 | [diff] [blame] | 265 | struct netlink_dump_control c = { |
| 266 | .dump = nfnl_acct_dump, |
Alexey Perevalov | f111f78 | 2014-08-20 22:03:18 +0400 | [diff] [blame] | 267 | .done = nfnl_acct_done, |
Pablo Neira Ayuso | 80d326f | 2012-02-24 14:30:15 +0000 | [diff] [blame] | 268 | }; |
Alexey Perevalov | f111f78 | 2014-08-20 22:03:18 +0400 | [diff] [blame] | 269 | |
| 270 | if (tb[NFACCT_FILTER]) { |
| 271 | struct nfacct_filter *filter; |
| 272 | |
| 273 | filter = nfacct_filter_alloc(tb[NFACCT_FILTER]); |
| 274 | if (IS_ERR(filter)) |
| 275 | return PTR_ERR(filter); |
| 276 | |
| 277 | c.data = filter; |
| 278 | } |
Pablo Neira Ayuso | 80d326f | 2012-02-24 14:30:15 +0000 | [diff] [blame] | 279 | return netlink_dump_start(nfnl, skb, nlh, &c); |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 280 | } |
| 281 | |
| 282 | if (!tb[NFACCT_NAME]) |
| 283 | return -EINVAL; |
| 284 | acct_name = nla_data(tb[NFACCT_NAME]); |
| 285 | |
| 286 | list_for_each_entry(cur, &nfnl_acct_list, head) { |
| 287 | struct sk_buff *skb2; |
| 288 | |
| 289 | if (strncmp(cur->name, acct_name, NFACCT_NAME_MAX)!= 0) |
| 290 | continue; |
| 291 | |
| 292 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
Pablo Neira Ayuso | 3ab0b24 | 2011-12-30 20:32:26 +0100 | [diff] [blame] | 293 | if (skb2 == NULL) { |
| 294 | ret = -ENOMEM; |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 295 | break; |
Pablo Neira Ayuso | 3ab0b24 | 2011-12-30 20:32:26 +0100 | [diff] [blame] | 296 | } |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 297 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 298 | ret = nfnl_acct_fill_info(skb2, NETLINK_CB(skb).portid, |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 299 | nlh->nlmsg_seq, |
| 300 | NFNL_MSG_TYPE(nlh->nlmsg_type), |
| 301 | NFNL_MSG_ACCT_NEW, cur); |
Pablo Neira Ayuso | 3ab0b24 | 2011-12-30 20:32:26 +0100 | [diff] [blame] | 302 | if (ret <= 0) { |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 303 | kfree_skb(skb2); |
Pablo Neira Ayuso | 3ab0b24 | 2011-12-30 20:32:26 +0100 | [diff] [blame] | 304 | break; |
| 305 | } |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 306 | ret = netlink_unicast(nfnl, skb2, NETLINK_CB(skb).portid, |
Pablo Neira Ayuso | 3ab0b24 | 2011-12-30 20:32:26 +0100 | [diff] [blame] | 307 | MSG_DONTWAIT); |
| 308 | if (ret > 0) |
| 309 | ret = 0; |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 310 | |
Pablo Neira Ayuso | 3ab0b24 | 2011-12-30 20:32:26 +0100 | [diff] [blame] | 311 | /* this avoids a loop in nfnetlink. */ |
| 312 | return ret == -EAGAIN ? -ENOBUFS : ret; |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 313 | } |
| 314 | return ret; |
| 315 | } |
| 316 | |
| 317 | /* try to delete object, fail if it is still in use. */ |
| 318 | static int nfnl_acct_try_del(struct nf_acct *cur) |
| 319 | { |
| 320 | int ret = 0; |
| 321 | |
| 322 | /* we want to avoid races with nfnl_acct_find_get. */ |
| 323 | if (atomic_dec_and_test(&cur->refcnt)) { |
| 324 | /* We are protected by nfnl mutex. */ |
| 325 | list_del_rcu(&cur->head); |
| 326 | kfree_rcu(cur, rcu_head); |
| 327 | } else { |
| 328 | /* still in use, restore reference counter. */ |
| 329 | atomic_inc(&cur->refcnt); |
| 330 | ret = -EBUSY; |
| 331 | } |
| 332 | return ret; |
| 333 | } |
| 334 | |
| 335 | static int |
| 336 | nfnl_acct_del(struct sock *nfnl, struct sk_buff *skb, |
| 337 | const struct nlmsghdr *nlh, const struct nlattr * const tb[]) |
| 338 | { |
| 339 | char *acct_name; |
| 340 | struct nf_acct *cur; |
| 341 | int ret = -ENOENT; |
| 342 | |
| 343 | if (!tb[NFACCT_NAME]) { |
| 344 | list_for_each_entry(cur, &nfnl_acct_list, head) |
| 345 | nfnl_acct_try_del(cur); |
| 346 | |
| 347 | return 0; |
| 348 | } |
| 349 | acct_name = nla_data(tb[NFACCT_NAME]); |
| 350 | |
| 351 | list_for_each_entry(cur, &nfnl_acct_list, head) { |
| 352 | if (strncmp(cur->name, acct_name, NFACCT_NAME_MAX) != 0) |
| 353 | continue; |
| 354 | |
| 355 | ret = nfnl_acct_try_del(cur); |
| 356 | if (ret < 0) |
| 357 | return ret; |
| 358 | |
| 359 | break; |
| 360 | } |
| 361 | return ret; |
| 362 | } |
| 363 | |
| 364 | static const struct nla_policy nfnl_acct_policy[NFACCT_MAX+1] = { |
| 365 | [NFACCT_NAME] = { .type = NLA_NUL_STRING, .len = NFACCT_NAME_MAX-1 }, |
| 366 | [NFACCT_BYTES] = { .type = NLA_U64 }, |
| 367 | [NFACCT_PKTS] = { .type = NLA_U64 }, |
Mathieu Poirier | 683399e | 2014-04-20 18:57:36 -0600 | [diff] [blame] | 368 | [NFACCT_FLAGS] = { .type = NLA_U32 }, |
| 369 | [NFACCT_QUOTA] = { .type = NLA_U64 }, |
Alexey Perevalov | f111f78 | 2014-08-20 22:03:18 +0400 | [diff] [blame] | 370 | [NFACCT_FILTER] = {.type = NLA_NESTED }, |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 371 | }; |
| 372 | |
| 373 | static const struct nfnl_callback nfnl_acct_cb[NFNL_MSG_ACCT_MAX] = { |
| 374 | [NFNL_MSG_ACCT_NEW] = { .call = nfnl_acct_new, |
| 375 | .attr_count = NFACCT_MAX, |
| 376 | .policy = nfnl_acct_policy }, |
| 377 | [NFNL_MSG_ACCT_GET] = { .call = nfnl_acct_get, |
| 378 | .attr_count = NFACCT_MAX, |
| 379 | .policy = nfnl_acct_policy }, |
| 380 | [NFNL_MSG_ACCT_GET_CTRZERO] = { .call = nfnl_acct_get, |
| 381 | .attr_count = NFACCT_MAX, |
| 382 | .policy = nfnl_acct_policy }, |
| 383 | [NFNL_MSG_ACCT_DEL] = { .call = nfnl_acct_del, |
| 384 | .attr_count = NFACCT_MAX, |
| 385 | .policy = nfnl_acct_policy }, |
| 386 | }; |
| 387 | |
| 388 | static const struct nfnetlink_subsystem nfnl_acct_subsys = { |
| 389 | .name = "acct", |
| 390 | .subsys_id = NFNL_SUBSYS_ACCT, |
| 391 | .cb_count = NFNL_MSG_ACCT_MAX, |
| 392 | .cb = nfnl_acct_cb, |
| 393 | }; |
| 394 | |
| 395 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ACCT); |
| 396 | |
| 397 | struct nf_acct *nfnl_acct_find_get(const char *acct_name) |
| 398 | { |
| 399 | struct nf_acct *cur, *acct = NULL; |
| 400 | |
| 401 | rcu_read_lock(); |
| 402 | list_for_each_entry_rcu(cur, &nfnl_acct_list, head) { |
| 403 | if (strncmp(cur->name, acct_name, NFACCT_NAME_MAX)!= 0) |
| 404 | continue; |
| 405 | |
| 406 | if (!try_module_get(THIS_MODULE)) |
| 407 | goto err; |
| 408 | |
| 409 | if (!atomic_inc_not_zero(&cur->refcnt)) { |
| 410 | module_put(THIS_MODULE); |
| 411 | goto err; |
| 412 | } |
| 413 | |
| 414 | acct = cur; |
| 415 | break; |
| 416 | } |
| 417 | err: |
| 418 | rcu_read_unlock(); |
| 419 | return acct; |
| 420 | } |
| 421 | EXPORT_SYMBOL_GPL(nfnl_acct_find_get); |
| 422 | |
| 423 | void nfnl_acct_put(struct nf_acct *acct) |
| 424 | { |
| 425 | atomic_dec(&acct->refcnt); |
| 426 | module_put(THIS_MODULE); |
| 427 | } |
| 428 | EXPORT_SYMBOL_GPL(nfnl_acct_put); |
| 429 | |
| 430 | void nfnl_acct_update(const struct sk_buff *skb, struct nf_acct *nfacct) |
| 431 | { |
| 432 | atomic64_inc(&nfacct->pkts); |
| 433 | atomic64_add(skb->len, &nfacct->bytes); |
| 434 | } |
| 435 | EXPORT_SYMBOL_GPL(nfnl_acct_update); |
| 436 | |
Mathieu Poirier | 683399e | 2014-04-20 18:57:36 -0600 | [diff] [blame] | 437 | static void nfnl_overquota_report(struct nf_acct *nfacct) |
| 438 | { |
| 439 | int ret; |
| 440 | struct sk_buff *skb; |
| 441 | |
| 442 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); |
| 443 | if (skb == NULL) |
| 444 | return; |
| 445 | |
| 446 | ret = nfnl_acct_fill_info(skb, 0, 0, NFNL_MSG_ACCT_OVERQUOTA, 0, |
| 447 | nfacct); |
| 448 | if (ret <= 0) { |
| 449 | kfree_skb(skb); |
| 450 | return; |
| 451 | } |
| 452 | netlink_broadcast(init_net.nfnl, skb, 0, NFNLGRP_ACCT_QUOTA, |
| 453 | GFP_ATOMIC); |
| 454 | } |
| 455 | |
| 456 | int nfnl_acct_overquota(const struct sk_buff *skb, struct nf_acct *nfacct) |
| 457 | { |
| 458 | u64 now; |
| 459 | u64 *quota; |
| 460 | int ret = NFACCT_UNDERQUOTA; |
| 461 | |
| 462 | /* no place here if we don't have a quota */ |
| 463 | if (!(nfacct->flags & NFACCT_F_QUOTA)) |
| 464 | return NFACCT_NO_QUOTA; |
| 465 | |
| 466 | quota = (u64 *)nfacct->data; |
| 467 | now = (nfacct->flags & NFACCT_F_QUOTA_PKTS) ? |
| 468 | atomic64_read(&nfacct->pkts) : atomic64_read(&nfacct->bytes); |
| 469 | |
| 470 | ret = now > *quota; |
| 471 | |
| 472 | if (now >= *quota && |
Alexey Perevalov | b6d0468 | 2014-07-31 17:14:05 +0400 | [diff] [blame] | 473 | !test_and_set_bit(NFACCT_OVERQUOTA_BIT, &nfacct->flags)) { |
Mathieu Poirier | 683399e | 2014-04-20 18:57:36 -0600 | [diff] [blame] | 474 | nfnl_overquota_report(nfacct); |
| 475 | } |
| 476 | |
| 477 | return ret; |
| 478 | } |
| 479 | EXPORT_SYMBOL_GPL(nfnl_acct_overquota); |
| 480 | |
Pablo Neira Ayuso | 9413902 | 2011-12-23 14:19:50 +0100 | [diff] [blame] | 481 | static int __init nfnl_acct_init(void) |
| 482 | { |
| 483 | int ret; |
| 484 | |
| 485 | pr_info("nfnl_acct: registering with nfnetlink.\n"); |
| 486 | ret = nfnetlink_subsys_register(&nfnl_acct_subsys); |
| 487 | if (ret < 0) { |
| 488 | pr_err("nfnl_acct_init: cannot register with nfnetlink.\n"); |
| 489 | goto err_out; |
| 490 | } |
| 491 | return 0; |
| 492 | err_out: |
| 493 | return ret; |
| 494 | } |
| 495 | |
| 496 | static void __exit nfnl_acct_exit(void) |
| 497 | { |
| 498 | struct nf_acct *cur, *tmp; |
| 499 | |
| 500 | pr_info("nfnl_acct: unregistering from nfnetlink.\n"); |
| 501 | nfnetlink_subsys_unregister(&nfnl_acct_subsys); |
| 502 | |
| 503 | list_for_each_entry_safe(cur, tmp, &nfnl_acct_list, head) { |
| 504 | list_del_rcu(&cur->head); |
| 505 | /* We are sure that our objects have no clients at this point, |
| 506 | * it's safe to release them all without checking refcnt. */ |
| 507 | kfree_rcu(cur, rcu_head); |
| 508 | } |
| 509 | } |
| 510 | |
| 511 | module_init(nfnl_acct_init); |
| 512 | module_exit(nfnl_acct_exit); |