Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 | /* IP tables module for matching the value of the IPv4/IPv6 DSCP field
*
* (C) 2002 by Harald Welte <laforge@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <net/dsfield.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_dscp.h>
#include <linux/netfilter_ipv4/ipt_tos.h>
MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
MODULE_DESCRIPTION("Xtables: DSCP/TOS field match");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_dscp");
MODULE_ALIAS("ip6t_dscp");
MODULE_ALIAS("ipt_tos");
MODULE_ALIAS("ip6t_tos");
static bool
dscp_mt(const struct sk_buff *skb, const struct net_device *in,
const struct net_device *out, const struct xt_match *match,
const void *matchinfo, int offset, unsigned int protoff, bool *hotdrop)
{
const struct xt_dscp_info *info = matchinfo;
u_int8_t dscp = ipv4_get_dsfield(ip_hdr(skb)) >> XT_DSCP_SHIFT;
return (dscp == info->dscp) ^ !!info->invert;
}
static bool
dscp_mt6(const struct sk_buff *skb, const struct net_device *in,
const struct net_device *out, const struct xt_match *match,
const void *matchinfo, int offset, unsigned int protoff,
bool *hotdrop)
{
const struct xt_dscp_info *info = matchinfo;
u_int8_t dscp = ipv6_get_dsfield(ipv6_hdr(skb)) >> XT_DSCP_SHIFT;
return (dscp == info->dscp) ^ !!info->invert;
}
static bool
dscp_mt_check(const char *tablename, const void *info,
const struct xt_match *match, void *matchinfo,
unsigned int hook_mask)
{
const u_int8_t dscp = ((struct xt_dscp_info *)matchinfo)->dscp;
if (dscp > XT_DSCP_MAX) {
printk(KERN_ERR "xt_dscp: dscp %x out of range\n", dscp);
return false;
}
return true;
}
static bool tos_mt_v0(const struct sk_buff *skb, const struct net_device *in,
const struct net_device *out,
const struct xt_match *match, const void *matchinfo,
int offset, unsigned int protoff, bool *hotdrop)
{
const struct ipt_tos_info *info = matchinfo;
return (ip_hdr(skb)->tos == info->tos) ^ info->invert;
}
static bool tos_mt(const struct sk_buff *skb, const struct net_device *in,
const struct net_device *out, const struct xt_match *match,
const void *matchinfo, int offset, unsigned int protoff,
bool *hotdrop)
{
const struct xt_tos_match_info *info = matchinfo;
if (match->family == AF_INET)
return ((ip_hdr(skb)->tos & info->tos_mask) ==
info->tos_value) ^ !!info->invert;
else
return ((ipv6_get_dsfield(ipv6_hdr(skb)) & info->tos_mask) ==
info->tos_value) ^ !!info->invert;
}
static struct xt_match dscp_mt_reg[] __read_mostly = {
{
.name = "dscp",
.family = AF_INET,
.checkentry = dscp_mt_check,
.match = dscp_mt,
.matchsize = sizeof(struct xt_dscp_info),
.me = THIS_MODULE,
},
{
.name = "dscp",
.family = AF_INET6,
.checkentry = dscp_mt_check,
.match = dscp_mt6,
.matchsize = sizeof(struct xt_dscp_info),
.me = THIS_MODULE,
},
{
.name = "tos",
.revision = 0,
.family = AF_INET,
.match = tos_mt_v0,
.matchsize = sizeof(struct ipt_tos_info),
.me = THIS_MODULE,
},
{
.name = "tos",
.revision = 1,
.family = AF_INET,
.match = tos_mt,
.matchsize = sizeof(struct xt_tos_match_info),
.me = THIS_MODULE,
},
{
.name = "tos",
.revision = 1,
.family = AF_INET6,
.match = tos_mt,
.matchsize = sizeof(struct xt_tos_match_info),
.me = THIS_MODULE,
},
};
static int __init dscp_mt_init(void)
{
return xt_register_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg));
}
static void __exit dscp_mt_exit(void)
{
xt_unregister_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg));
}
module_init(dscp_mt_init);
module_exit(dscp_mt_exit);
|