/* Length Match - IPv6 Port */
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/* Length Match - IPv6 Port */
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#include <linux/module.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/skbuff.h>
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#include <linux/netfilter_ipv6/ip6t_length.h>
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#include <linux/netfilter_ipv6/ip6t_length.h>
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#include <linux/netfilter_ipv6/ip6_tables.h>
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#include <linux/netfilter_ipv6/ip6_tables.h>
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static int
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static int
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match(const struct sk_buff *skb,
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match(const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *in,
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const struct net_device *out,
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const struct net_device *out,
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const void *matchinfo,
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const void *matchinfo,
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int offset,
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int offset,
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const void *hdr,
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const void *hdr,
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u_int16_t datalen,
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u_int16_t datalen,
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int *hotdrop)
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int *hotdrop)
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{
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{
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const struct ip6t_length_info *info = matchinfo;
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const struct ip6t_length_info *info = matchinfo;
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u_int16_t pktlen = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr);
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u_int16_t pktlen = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr);
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return (pktlen >= info->min && pktlen <= info->max) ^ info->invert;
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return (pktlen >= info->min && pktlen <= info->max) ^ info->invert;
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}
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}
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static int
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static int
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checkentry(const char *tablename,
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checkentry(const char *tablename,
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const struct ip6t_ip6 *ip,
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const struct ip6t_ip6 *ip,
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void *matchinfo,
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void *matchinfo,
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unsigned int matchsize,
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unsigned int matchsize,
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unsigned int hook_mask)
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unsigned int hook_mask)
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{
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{
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if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_length_info)))
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if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_length_info)))
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return 0;
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return 0;
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return 1;
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return 1;
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}
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}
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static struct ip6t_match length_match
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static struct ip6t_match length_match
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= { { NULL, NULL }, "length", &match, &checkentry, NULL, THIS_MODULE };
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= { { NULL, NULL }, "length", &match, &checkentry, NULL, THIS_MODULE };
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static int __init init(void)
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static int __init init(void)
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{
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{
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return ip6t_register_match(&length_match);
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return ip6t_register_match(&length_match);
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}
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}
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static void __exit fini(void)
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static void __exit fini(void)
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{
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{
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ip6t_unregister_match(&length_match);
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ip6t_unregister_match(&length_match);
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}
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}
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module_init(init);
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module_init(init);
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module_exit(fini);
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module_exit(fini);
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