This replaces IPv4 dscp match by address family independent version. This also - utilizes dsfield.h to get the DS field in IPv4/IPv6 header, and - checks for the DSCP value from user space. - fixes Kconfig help text. Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
113 lines
2.7 KiB
C
113 lines
2.7 KiB
C
/* IP tables module for matching the value of the IPv4/IPv6 DSCP field
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*
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* xt_dscp.c,v 1.3 2002/08/05 19:00:21 laforge Exp
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*
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* (C) 2002 by Harald Welte <laforge@netfilter.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <net/dsfield.h>
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#include <linux/netfilter/xt_dscp.h>
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#include <linux/netfilter/x_tables.h>
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MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
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MODULE_DESCRIPTION("x_tables DSCP matching module");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("ipt_dscp");
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MODULE_ALIAS("ip6t_dscp");
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static int match(const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const struct xt_match *match,
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const void *matchinfo,
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int offset,
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unsigned int protoff,
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int *hotdrop)
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{
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const struct xt_dscp_info *info = matchinfo;
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u_int8_t dscp = ipv4_get_dsfield(skb->nh.iph) >> XT_DSCP_SHIFT;
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return (dscp == info->dscp) ^ !!info->invert;
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}
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static int match6(const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const struct xt_match *match,
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const void *matchinfo,
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int offset,
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unsigned int protoff,
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int *hotdrop)
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{
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const struct xt_dscp_info *info = matchinfo;
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u_int8_t dscp = ipv6_get_dsfield(skb->nh.ipv6h) >> XT_DSCP_SHIFT;
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return (dscp == info->dscp) ^ !!info->invert;
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}
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static int checkentry(const char *tablename,
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const void *info,
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const struct xt_match *match,
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void *matchinfo,
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unsigned int matchsize,
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unsigned int hook_mask)
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{
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const u_int8_t dscp = ((struct xt_dscp_info *)matchinfo)->dscp;
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if (dscp > XT_DSCP_MAX) {
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printk(KERN_ERR "xt_dscp: dscp %x out of range\n", dscp);
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return 0;
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}
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return 1;
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}
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static struct xt_match dscp_match = {
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.name = "dscp",
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.match = match,
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.checkentry = checkentry,
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.matchsize = sizeof(struct xt_dscp_info),
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.family = AF_INET,
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.me = THIS_MODULE,
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};
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static struct xt_match dscp6_match = {
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.name = "dscp",
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.match = match6,
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.checkentry = checkentry,
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.matchsize = sizeof(struct xt_dscp_info),
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.family = AF_INET6,
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.me = THIS_MODULE,
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};
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static int __init xt_dscp_match_init(void)
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{
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int ret;
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ret = xt_register_match(&dscp_match);
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if (ret)
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return ret;
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ret = xt_register_match(&dscp6_match);
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if (ret)
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xt_unregister_match(&dscp_match);
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return ret;
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}
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static void __exit xt_dscp_match_fini(void)
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{
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xt_unregister_match(&dscp_match);
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xt_unregister_match(&dscp6_match);
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}
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module_init(xt_dscp_match_init);
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module_exit(xt_dscp_match_fini);
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