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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [net/] [ipv6/] [netfilter/] [ip6t_eui64.c] - Rev 1275
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/* Kernel module to match EUI64 address parameters. */ #include <linux/module.h> #include <linux/skbuff.h> #include <linux/ipv6.h> #include <linux/if_ether.h> #include <linux/netfilter_ipv6/ip6_tables.h> static int match(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) { unsigned char eui64[8]; int i=0; if ( !(skb->mac.raw >= skb->head && (skb->mac.raw + ETH_HLEN) <= skb->data) && offset != 0) { *hotdrop = 1; return 0; } memset(eui64, 0, sizeof(eui64)); if (skb->mac.ethernet->h_proto == ntohs(ETH_P_IPV6)) { if (skb->nh.ipv6h->version == 0x6) { memcpy(eui64, skb->mac.ethernet->h_source, 3); memcpy(eui64 + 5, skb->mac.ethernet->h_source + 3, 3); eui64[3]=0xff; eui64[4]=0xfe; eui64[0] |= 0x02; i=0; while ((skb->nh.ipv6h->saddr.in6_u.u6_addr8[8+i] == eui64[i]) && (i<8)) i++; if ( i == 8 ) return 1; } } return 0; } static int ip6t_eui64_checkentry(const char *tablename, const struct ip6t_ip6 *ip, void *matchinfo, unsigned int matchsize, unsigned int hook_mask) { if (hook_mask & ~((1 << NF_IP6_PRE_ROUTING) | (1 << NF_IP6_LOCAL_IN) | (1 << NF_IP6_PRE_ROUTING) )) { printk("ip6t_eui64: only valid for PRE_ROUTING, LOCAL_IN or FORWARD.\n"); return 0; } if (matchsize != IP6T_ALIGN(sizeof(int))) return 0; return 1; } static struct ip6t_match eui64_match = { { NULL, NULL }, "eui64", &match, &ip6t_eui64_checkentry, NULL, THIS_MODULE }; static int __init init(void) { return ip6t_register_match(&eui64_match); } static void __exit fini(void) { ip6t_unregister_match(&eui64_match); } module_init(init); module_exit(fini); MODULE_DESCRIPTION("IPv6 EUI64 address checking match"); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");
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