1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374 |
- /* Kernel module to match EUI64 address parameters. */
- /* (C) 2001-2002 Andras Kis-Szabo <kisza@sch.bme.hu>
- *
- * 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/ipv6.h>
- #include <linux/if_ether.h>
- #include <linux/netfilter/x_tables.h>
- #include <linux/netfilter_ipv6/ip6_tables.h>
- MODULE_DESCRIPTION("Xtables: IPv6 EUI64 address match");
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");
- static bool
- eui64_mt6(const struct sk_buff *skb, struct xt_action_param *par)
- {
- unsigned char eui64[8];
- if (!(skb_mac_header(skb) >= skb->head &&
- skb_mac_header(skb) + ETH_HLEN <= skb->data) &&
- par->fragoff != 0) {
- par->hotdrop = true;
- return false;
- }
- memset(eui64, 0, sizeof(eui64));
- if (eth_hdr(skb)->h_proto == htons(ETH_P_IPV6)) {
- if (ipv6_hdr(skb)->version == 0x6) {
- memcpy(eui64, eth_hdr(skb)->h_source, 3);
- memcpy(eui64 + 5, eth_hdr(skb)->h_source + 3, 3);
- eui64[3] = 0xff;
- eui64[4] = 0xfe;
- eui64[0] ^= 0x02;
- if (!memcmp(ipv6_hdr(skb)->saddr.s6_addr + 8, eui64,
- sizeof(eui64)))
- return true;
- }
- }
- return false;
- }
- static struct xt_match eui64_mt6_reg __read_mostly = {
- .name = "eui64",
- .family = NFPROTO_IPV6,
- .match = eui64_mt6,
- .matchsize = sizeof(int),
- .hooks = (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_IN) |
- (1 << NF_INET_FORWARD),
- .me = THIS_MODULE,
- };
- static int __init eui64_mt6_init(void)
- {
- return xt_register_match(&eui64_mt6_reg);
- }
- static void __exit eui64_mt6_exit(void)
- {
- xt_unregister_match(&eui64_mt6_reg);
- }
- module_init(eui64_mt6_init);
- module_exit(eui64_mt6_exit);
|