diff options
Diffstat (limited to 'net/netfilter/xt_pkttype.c')
-rw-r--r-- | net/netfilter/xt_pkttype.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/net/netfilter/xt_pkttype.c b/net/netfilter/xt_pkttype.c new file mode 100644 index 000000000000..ab1b2630f97d --- /dev/null +++ b/net/netfilter/xt_pkttype.c @@ -0,0 +1,82 @@ +/* (C) 1999-2001 Michal Ludvig <michal@logix.cz> + * + * 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/if_ether.h> +#include <linux/if_packet.h> + +#include <linux/netfilter/xt_pkttype.h> +#include <linux/netfilter/x_tables.h> + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>"); +MODULE_DESCRIPTION("IP tables match to match on linklayer packet type"); +MODULE_ALIAS("ipt_pkttype"); +MODULE_ALIAS("ip6t_pkttype"); + +static int match(const struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + const void *matchinfo, + int offset, + unsigned int protoff, + int *hotdrop) +{ + const struct xt_pkttype_info *info = matchinfo; + + return (skb->pkt_type == info->pkttype) ^ info->invert; +} + +static int checkentry(const char *tablename, + const void *ip, + void *matchinfo, + unsigned int matchsize, + unsigned int hook_mask) +{ + if (matchsize != XT_ALIGN(sizeof(struct xt_pkttype_info))) + return 0; + + return 1; +} + +static struct xt_match pkttype_match = { + .name = "pkttype", + .match = &match, + .checkentry = &checkentry, + .me = THIS_MODULE, +}; +static struct xt_match pkttype6_match = { + .name = "pkttype", + .match = &match, + .checkentry = &checkentry, + .me = THIS_MODULE, +}; + + +static int __init init(void) +{ + int ret; + ret = xt_register_match(AF_INET, &pkttype_match); + if (ret) + return ret; + + ret = xt_register_match(AF_INET6, &pkttype6_match); + if (ret) + xt_unregister_match(AF_INET, &pkttype_match); + + return ret; +} + +static void __exit fini(void) +{ + xt_unregister_match(AF_INET, &pkttype_match); + xt_unregister_match(AF_INET6, &pkttype6_match); +} + +module_init(init); +module_exit(fini); |