target/linux/generic-2.4/patches/612-netfilter_quota.patch

   1 --- a/Documentation/Configure.help
   2 +++ b/Documentation/Configure.help
   3 @@ -2888,6 +2888,13 @@ CONFIG_IP_NF_MATCH_LIMIT
   4    If you want to compile it as a module, say M here and read
   5    <file:Documentation/modules.txt>.  If unsure, say `N'.
   6
   7 +quota match support
   8 +CONFIG_IP_NF_MATCH_QUOTA
   9 +  This match implements network quotas.
  10 +
  11 +  If you want to compile it as a module, say M here and read
  12 +  Documentation/modules.txt.  If unsure, say `N'.
  13 +
  14  skb->pkt_type packet match support
  15  CONFIG_IP_NF_MATCH_PKTTYPE
  16    This patch allows you to match packet in accrodance
  17 --- /dev/null
  18 +++ b/include/linux/netfilter_ipv4/ipt_quota.h
  19 @@ -0,0 +1,12 @@
  20 +#ifndef _IPT_QUOTA_H
  21 +#define _IPT_QUOTA_H
  22 +
  23 +/* print debug info in both kernel/netfilter module & iptable library */
  24 +//#define DEBUG_IPT_QUOTA
  25 +
  26 +struct ipt_quota_info {
  27 +        u_int64_t quota;
  28 +       struct ipt_quota_info *master;
  29 +};
  30 +
  31 +#endif /*_IPT_QUOTA_H*/
  32 --- a/net/ipv4/netfilter/Config.in
  33 +++ b/net/ipv4/netfilter/Config.in
  34 @@ -24,6 +24,7 @@ tristate 'IP tables support (required fo
  35  if [ "$CONFIG_IP_NF_IPTABLES" != "n" ]; then
  36  # The simple matches.
  37    dep_tristate '  limit match support' CONFIG_IP_NF_MATCH_LIMIT $CONFIG_IP_NF_IPTABLES
  38 +  dep_tristate '  quota match support' CONFIG_IP_NF_MATCH_QUOTA $CONFIG_IP_NF_IPTABLES
  39
  40    dep_tristate '  IP set support' CONFIG_IP_NF_SET $CONFIG_IP_NF_IPTABLES
  41    if [ "$CONFIG_IP_NF_SET" != "n" ]; then
  42 --- a/net/ipv4/netfilter/Makefile
  43 +++ b/net/ipv4/netfilter/Makefile
  44 @@ -74,6 +74,7 @@ obj-$(CONFIG_IP_NF_NAT) += iptable_nat.o
  45  # matches
  46  obj-$(CONFIG_IP_NF_MATCH_HELPER) += ipt_helper.o
  47  obj-$(CONFIG_IP_NF_MATCH_LIMIT) += ipt_limit.o
  48 +obj-$(CONFIG_IP_NF_MATCH_QUOTA) += ipt_quota.o
  49  obj-$(CONFIG_IP_NF_MATCH_MARK) += ipt_mark.o
  50  obj-$(CONFIG_IP_NF_MATCH_SET) += ipt_set.o
  51  obj-$(CONFIG_IP_NF_TARGET_SET) += ipt_SET.o
  52 --- /dev/null
  53 +++ b/net/ipv4/netfilter/ipt_quota.c
  54 @@ -0,0 +1,88 @@
  55 +/*
  56 + * netfilter module to enforce network quotas
  57 + *
  58 + * Sam Johnston <samj@samj.net>
  59 + *
  60 + * 30/01/05: Fixed on SMP --Pablo Neira <pablo@eurodev.net>
  61 + */
  62 +#include <linux/module.h>
  63 +#include <linux/skbuff.h>
  64 +#include <linux/spinlock.h>
  65 +#include <linux/interrupt.h>
  66 +
  67 +#include <linux/netfilter_ipv4/ip_tables.h>
  68 +#include <linux/netfilter_ipv4/ipt_quota.h>
  69 +
  70 +MODULE_LICENSE("GPL");
  71 +
  72 +static spinlock_t quota_lock = SPIN_LOCK_UNLOCKED;
  73 +
  74 +static int
  75 +match(const struct sk_buff *skb,
  76 +      const struct net_device *in,
  77 +      const struct net_device *out,
  78 +      const void *matchinfo,
  79 +      int offset, const void *hdr, u_int16_t datalen, int *hotdrop)
  80 +{
  81 +       struct ipt_quota_info *q =
  82 +               ((struct ipt_quota_info *) matchinfo)->master;
  83 +
  84 +        spin_lock_bh(&quota_lock);
  85 +
  86 +        if (q->quota >= datalen) {
  87 +                /* we can afford this one */
  88 +                q->quota -= datalen;
  89 +                spin_unlock_bh(&quota_lock);
  90 +
  91 +#ifdef DEBUG_IPT_QUOTA
  92 +                printk("IPT Quota OK: %llu datlen %d \n", q->quota, datalen);
  93 +#endif
  94 +                return 1;
  95 +        }
  96 +
  97 +        /* so we do not allow even small packets from now on */
  98 +        q->quota = 0;
  99 +
 100 +#ifdef DEBUG_IPT_QUOTA
 101 +        printk("IPT Quota Failed: %llu datlen %d \n", q->quota, datalen);
 102 +#endif
 103 +
 104 +        spin_unlock_bh(&quota_lock);
 105 +        return 0;
 106 +}
 107 +
 108 +static int
 109 +checkentry(const char *tablename,
 110 +           const struct ipt_ip *ip,
 111 +           void *matchinfo, unsigned int matchsize, unsigned int hook_mask)
 112 +{
 113 +        /* TODO: spinlocks? sanity checks? */
 114 +       struct ipt_quota_info *q = (struct ipt_quota_info *) matchinfo;
 115 +
 116 +        if (matchsize != IPT_ALIGN(sizeof (struct ipt_quota_info)))
 117 +                return 0;
 118 +
 119 +       /* For SMP, we only want to use one set of counters. */
 120 +       q->master = q;
 121 +
 122 +        return 1;
 123 +}
 124 +
 125 +static struct ipt_match quota_match
 126 +    = { {NULL, NULL}, "quota", &match, &checkentry, NULL, THIS_MODULE };
 127 +
 128 +static int __init
 129 +init(void)
 130 +{
 131 +        return ipt_register_match(&quota_match);
 132 +}
 133 +
 134 +static void __exit
 135 +fini(void)
 136 +{
 137 +        ipt_unregister_match(&quota_match);
 138 +}
 139 +
 140 +module_init(init);
 141 +module_exit(fini);
 142 +