/* Kernel module to match connection tracking byte counter.
* GPL (C) 2002 Martin Devera (devik@cdi.cz).
- *
- * 2004-07-20 Harald Welte <laforge@netfilter.org>
- * - reimplemented to use per-connection accounting counters
- * - add functionality to match number of packets
- * - add functionality to match average packet size
- * - add support to match directions seperately
- * 2005-10-16 Harald Welte <laforge@netfilter.org>
- * - Port to x_tables
- *
*/
#include <linux/module.h>
+#include <linux/bitops.h>
#include <linux/skbuff.h>
-#include <net/netfilter/nf_conntrack_compat.h>
+#include <linux/math64.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_connbytes.h>
-
-#include <asm/div64.h>
-#include <asm/bitops.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_acct.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
-MODULE_DESCRIPTION("iptables match for matching number of pkts/bytes per connection");
+MODULE_DESCRIPTION("Xtables: Number of packets/bytes per connection matching");
MODULE_ALIAS("ipt_connbytes");
+MODULE_ALIAS("ip6t_connbytes");
-/* 64bit divisor, dividend and result. dynamic precision */
-static u_int64_t div64_64(u_int64_t dividend, u_int64_t divisor)
-{
- u_int32_t d = divisor;
-
- if (divisor > 0xffffffffULL) {
- unsigned int shift = fls(divisor >> 32);
-
- d = divisor >> shift;
- dividend >>= shift;
- }
-
- do_div(dividend, d);
- return dividend;
-}
-
-static int
-match(const struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- const void *matchinfo,
- int offset,
- unsigned int protoff,
- int *hotdrop)
+static bool
+connbytes_mt(const struct sk_buff *skb, const struct xt_match_param *par)
{
- const struct xt_connbytes_info *sinfo = matchinfo;
+ const struct xt_connbytes_info *sinfo = par->matchinfo;
+ const struct nf_conn *ct;
+ enum ip_conntrack_info ctinfo;
u_int64_t what = 0; /* initialize to make gcc happy */
- const struct ip_conntrack_counter *counters;
+ u_int64_t bytes = 0;
+ u_int64_t pkts = 0;
+ const struct nf_conn_counter *counters;
- if (!(counters = nf_ct_get_counters(skb)))
- return 0; /* no match */
+ ct = nf_ct_get(skb, &ctinfo);
+ if (!ct)
+ return false;
+
+ counters = nf_conn_acct_find(ct);
+ if (!counters)
+ return false;
switch (sinfo->what) {
case XT_CONNBYTES_PKTS:
case XT_CONNBYTES_AVGPKT:
switch (sinfo->direction) {
case XT_CONNBYTES_DIR_ORIGINAL:
- what = div64_64(counters[IP_CT_DIR_ORIGINAL].bytes,
- counters[IP_CT_DIR_ORIGINAL].packets);
+ bytes = counters[IP_CT_DIR_ORIGINAL].bytes;
+ pkts = counters[IP_CT_DIR_ORIGINAL].packets;
break;
case XT_CONNBYTES_DIR_REPLY:
- what = div64_64(counters[IP_CT_DIR_REPLY].bytes,
- counters[IP_CT_DIR_REPLY].packets);
+ bytes = counters[IP_CT_DIR_REPLY].bytes;
+ pkts = counters[IP_CT_DIR_REPLY].packets;
break;
case XT_CONNBYTES_DIR_BOTH:
- {
- u_int64_t bytes;
- u_int64_t pkts;
- bytes = counters[IP_CT_DIR_ORIGINAL].bytes +
- counters[IP_CT_DIR_REPLY].bytes;
- pkts = counters[IP_CT_DIR_ORIGINAL].packets+
- counters[IP_CT_DIR_REPLY].packets;
-
- /* FIXME_THEORETICAL: what to do if sum
- * overflows ? */
-
- what = div64_64(bytes, pkts);
- }
+ bytes = counters[IP_CT_DIR_ORIGINAL].bytes +
+ counters[IP_CT_DIR_REPLY].bytes;
+ pkts = counters[IP_CT_DIR_ORIGINAL].packets +
+ counters[IP_CT_DIR_REPLY].packets;
break;
}
+ if (pkts != 0)
+ what = div64_u64(bytes, pkts);
break;
}
if (sinfo->count.to)
- return (what <= sinfo->count.to && what >= sinfo->count.from);
+ return what <= sinfo->count.to && what >= sinfo->count.from;
else
- return (what >= sinfo->count.from);
+ return what >= sinfo->count.from;
}
-static int check(const char *tablename,
- const void *ip,
- void *matchinfo,
- unsigned int matchsize,
- unsigned int hook_mask)
+static bool connbytes_mt_check(const struct xt_mtchk_param *par)
{
- const struct xt_connbytes_info *sinfo = matchinfo;
-
- if (matchsize != XT_ALIGN(sizeof(struct xt_connbytes_info)))
- return 0;
+ const struct xt_connbytes_info *sinfo = par->matchinfo;
if (sinfo->what != XT_CONNBYTES_PKTS &&
sinfo->what != XT_CONNBYTES_BYTES &&
sinfo->what != XT_CONNBYTES_AVGPKT)
- return 0;
+ return false;
if (sinfo->direction != XT_CONNBYTES_DIR_ORIGINAL &&
sinfo->direction != XT_CONNBYTES_DIR_REPLY &&
sinfo->direction != XT_CONNBYTES_DIR_BOTH)
- return 0;
+ return false;
+
+ if (nf_ct_l3proto_try_module_get(par->family) < 0) {
+ printk(KERN_WARNING "can't load conntrack support for "
+ "proto=%u\n", par->family);
+ return false;
+ }
- return 1;
+ return true;
}
-static struct xt_match connbytes_match = {
- .name = "connbytes",
- .match = &match,
- .checkentry = &check,
- .me = THIS_MODULE
-};
-static struct xt_match connbytes6_match = {
- .name = "connbytes",
- .match = &match,
- .checkentry = &check,
- .me = THIS_MODULE
+static void connbytes_mt_destroy(const struct xt_mtdtor_param *par)
+{
+ nf_ct_l3proto_module_put(par->family);
+}
+
+static struct xt_match connbytes_mt_reg __read_mostly = {
+ .name = "connbytes",
+ .revision = 0,
+ .family = NFPROTO_UNSPEC,
+ .checkentry = connbytes_mt_check,
+ .match = connbytes_mt,
+ .destroy = connbytes_mt_destroy,
+ .matchsize = sizeof(struct xt_connbytes_info),
+ .me = THIS_MODULE,
};
-static int __init init(void)
+static int __init connbytes_mt_init(void)
{
- int ret;
- ret = xt_register_match(AF_INET, &connbytes_match);
- if (ret)
- return ret;
-
- ret = xt_register_match(AF_INET6, &connbytes6_match);
- if (ret)
- xt_unregister_match(AF_INET, &connbytes_match);
- return ret;
+ return xt_register_match(&connbytes_mt_reg);
}
-static void __exit fini(void)
+static void __exit connbytes_mt_exit(void)
{
- xt_unregister_match(AF_INET, &connbytes_match);
- xt_unregister_match(AF_INET6, &connbytes6_match);
+ xt_unregister_match(&connbytes_mt_reg);
}
-module_init(init);
-module_exit(fini);
+module_init(connbytes_mt_init);
+module_exit(connbytes_mt_exit);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff