// SPDX-License-Identifier: GPL-2.0-only
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/* Kernel module to match EUI64 address parameters. */
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/* (C) 2001-2002 Andras Kis-Szabo <kisza@sch.bme.hu>
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*/
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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/x_tables.h>
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#include <linux/netfilter_ipv6/ip6_tables.h>
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MODULE_DESCRIPTION("Xtables: IPv6 EUI64 address 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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static bool
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eui64_mt6(const struct sk_buff *skb, struct xt_action_param *par)
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{
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unsigned char eui64[8];
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if (!(skb_mac_header(skb) >= skb->head &&
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skb_mac_header(skb) + ETH_HLEN <= skb->data) &&
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par->fragoff != 0) {
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par->hotdrop = true;
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return false;
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}
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memset(eui64, 0, sizeof(eui64));
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if (eth_hdr(skb)->h_proto == htons(ETH_P_IPV6)) {
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if (ipv6_hdr(skb)->version == 0x6) {
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memcpy(eui64, eth_hdr(skb)->h_source, 3);
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memcpy(eui64 + 5, eth_hdr(skb)->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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if (!memcmp(ipv6_hdr(skb)->saddr.s6_addr + 8, eui64,
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sizeof(eui64)))
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return true;
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}
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}
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return false;
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}
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static struct xt_match eui64_mt6_reg __read_mostly = {
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.name = "eui64",
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.family = NFPROTO_IPV6,
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.match = eui64_mt6,
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.matchsize = sizeof(int),
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.hooks = (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_IN) |
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(1 << NF_INET_FORWARD),
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.me = THIS_MODULE,
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};
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static int __init eui64_mt6_init(void)
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{
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return xt_register_match(&eui64_mt6_reg);
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}
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static void __exit eui64_mt6_exit(void)
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{
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xt_unregister_match(&eui64_mt6_reg);
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}
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module_init(eui64_mt6_init);
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module_exit(eui64_mt6_exit);
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