diff options
Diffstat (limited to 'net/ipv4/netfilter/ipt_dscp.c')
-rw-r--r-- | net/ipv4/netfilter/ipt_dscp.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/ipt_dscp.c b/net/ipv4/netfilter/ipt_dscp.c new file mode 100644 index 00000000000..5df52a64a5d --- /dev/null +++ b/net/ipv4/netfilter/ipt_dscp.c @@ -0,0 +1,63 @@ +/* IP tables module for matching the value of the IPv4 DSCP field + * + * ipt_dscp.c,v 1.3 2002/08/05 19:00:21 laforge Exp + * + * (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/netfilter_ipv4/ipt_dscp.h> +#include <linux/netfilter_ipv4/ip_tables.h> + +MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); +MODULE_DESCRIPTION("iptables DSCP matching module"); +MODULE_LICENSE("GPL"); + +static int match(const struct sk_buff *skb, const struct net_device *in, + const struct net_device *out, const void *matchinfo, + int offset, int *hotdrop) +{ + const struct ipt_dscp_info *info = matchinfo; + const struct iphdr *iph = skb->nh.iph; + + u_int8_t sh_dscp = ((info->dscp << IPT_DSCP_SHIFT) & IPT_DSCP_MASK); + + return ((iph->tos&IPT_DSCP_MASK) == sh_dscp) ^ info->invert; +} + +static int checkentry(const char *tablename, const struct ipt_ip *ip, + void *matchinfo, unsigned int matchsize, + unsigned int hook_mask) +{ + if (matchsize != IPT_ALIGN(sizeof(struct ipt_dscp_info))) + return 0; + + return 1; +} + +static struct ipt_match dscp_match = { + .name = "dscp", + .match = &match, + .checkentry = &checkentry, + .me = THIS_MODULE, +}; + +static int __init init(void) +{ + return ipt_register_match(&dscp_match); +} + +static void __exit fini(void) +{ + ipt_unregister_match(&dscp_match); + +} + +module_init(init); +module_exit(fini); |