diff options
Diffstat (limited to 'net/ipv4/netfilter/ipt_mark.c')
-rw-r--r-- | net/ipv4/netfilter/ipt_mark.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/ipt_mark.c b/net/ipv4/netfilter/ipt_mark.c new file mode 100644 index 0000000..8955728 --- /dev/null +++ b/net/ipv4/netfilter/ipt_mark.c @@ -0,0 +1,64 @@ +/* Kernel module to match NFMARK values. */ + +/* (C) 1999-2001 Marc Boucher <marc@mbsi.ca> + * + * 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_mark.h> +#include <linux/netfilter_ipv4/ip_tables.h> + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>"); +MODULE_DESCRIPTION("iptables mark matching module"); + +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_mark_info *info = matchinfo; + + return ((skb->nfmark & info->mask) == info->mark) ^ 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_mark_info))) + return 0; + + return 1; +} + +static struct ipt_match mark_match = { + .name = "mark", + .match = &match, + .checkentry = &checkentry, + .me = THIS_MODULE, +}; + +static int __init init(void) +{ + return ipt_register_match(&mark_match); +} + +static void __exit fini(void) +{ + ipt_unregister_match(&mark_match); +} + +module_init(init); +module_exit(fini); |