?? ip6t_length.c
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/* Length Match - IPv6 Port *//* (C) 1999-2001 James Morris <jmorros@intercode.com.au> * * 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_ipv6/ip6t_length.h>#include <linux/netfilter_ipv6/ip6_tables.h>MODULE_LICENSE("GPL");MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");MODULE_DESCRIPTION("IPv6 packet length match");static intmatch(const struct sk_buff *skb, const struct net_device *in, const struct net_device *out, const void *matchinfo, int offset, const void *hdr, u_int16_t datalen, int *hotdrop){ const struct ip6t_length_info *info = matchinfo; u_int16_t pktlen = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr); return (pktlen >= info->min && pktlen <= info->max) ^ info->invert;}static intcheckentry(const char *tablename, const struct ip6t_ip6 *ip, void *matchinfo, unsigned int matchsize, unsigned int hook_mask){ if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_length_info))) return 0; return 1;}static struct ip6t_match length_match = { .name = "length", .match = &match, .checkentry = &checkentry, .me = THIS_MODULE,};static int __init init(void){ return ip6t_register_match(&length_match);}static void __exit fini(void){ ip6t_unregister_match(&length_match);}module_init(init);module_exit(fini);
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