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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [net/] [ipv6/] [netfilter/] [ip6t_eui64.c] - Blame information for rev 1275

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Line No. Rev Author Line
1 1275 phoenix 
/* Kernel module to match EUI64 address parameters. */
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/ipv6.h>
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#include <linux/if_ether.h>
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#include <linux/netfilter_ipv6/ip6_tables.h>
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static int
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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 *out,
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      const void *matchinfo,
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      int offset,
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      const void *hdr,
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      u_int16_t datalen,
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      int *hotdrop)
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{
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    unsigned char eui64[8];
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    int i=0;
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     if ( !(skb->mac.raw >= skb->head
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                && (skb->mac.raw + ETH_HLEN) <= skb->data)
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                && offset != 0) {
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                        *hotdrop = 1;
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                        return 0;
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                }
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    memset(eui64, 0, sizeof(eui64));
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    if (skb->mac.ethernet->h_proto == ntohs(ETH_P_IPV6)) {
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      if (skb->nh.ipv6h->version == 0x6) {
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         memcpy(eui64, skb->mac.ethernet->h_source, 3);
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         memcpy(eui64 + 5, skb->mac.ethernet->h_source + 3, 3);
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         eui64[3]=0xff;
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         eui64[4]=0xfe;
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         eui64[0] |= 0x02;
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         i=0;
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         while ((skb->nh.ipv6h->saddr.in6_u.u6_addr8[8+i] ==
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                         eui64[i]) && (i<8)) i++;
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         if ( i == 8 )
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                return 1;
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      }
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    }
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    return 0;
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}
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static int
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ip6t_eui64_checkentry(const char *tablename,
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                   const struct ip6t_ip6 *ip,
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                   void *matchinfo,
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                   unsigned int matchsize,
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                   unsigned int hook_mask)
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{
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        if (hook_mask
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            & ~((1 << NF_IP6_PRE_ROUTING) | (1 << NF_IP6_LOCAL_IN) |
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                (1 << NF_IP6_PRE_ROUTING) )) {
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                printk("ip6t_eui64: only valid for PRE_ROUTING, LOCAL_IN or FORWARD.\n");
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                return 0;
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        }
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        if (matchsize != IP6T_ALIGN(sizeof(int)))
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                return 0;
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        return 1;
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}
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static struct ip6t_match eui64_match
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= { { NULL, NULL }, "eui64", &match, &ip6t_eui64_checkentry, NULL, THIS_MODULE };
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static int __init init(void)
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{
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        return ip6t_register_match(&eui64_match);
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}
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static void __exit fini(void)
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{
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        ip6t_unregister_match(&eui64_match);
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}
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module_init(init);
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module_exit(fini);
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MODULE_DESCRIPTION("IPv6 EUI64 address checking match");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");

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