ip6t_mac.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:2k
- /* Kernel module to match MAC address parameters. */
- #include <linux/module.h>
- #include <linux/skbuff.h>
- #include <linux/if_ether.h>
- #include <linux/netfilter_ipv6/ip6t_mac.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)
- {
- const struct ip6t_mac_info *info = matchinfo;
- /* Is mac pointer valid? */
- return (skb->mac.raw >= skb->head
- && (skb->mac.raw + ETH_HLEN) <= skb->data
- /* If so, compare... */
- && ((memcmp(skb->mac.ethernet->h_source, info->srcaddr, ETH_ALEN)
- == 0) ^ info->invert));
- }
- static int
- ip6t_mac_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_FORWARD))) {
- printk("ip6t_mac: only valid for PRE_ROUTING, LOCAL_IN or"
- " FORWARDn");
- return 0;
- }
- if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_mac_info)))
- return 0;
- return 1;
- }
- static struct ip6t_match mac_match
- = { { NULL, NULL }, "mac", &match, &ip6t_mac_checkentry, NULL, THIS_MODULE };
- static int __init init(void)
- {
- return ip6t_register_match(&mac_match);
- }
- static void __exit fini(void)
- {
- ip6t_unregister_match(&mac_match);
- }
- module_init(init);
- module_exit(fini);
- MODULE_LICENSE("GPL");
- MODULE_DESCRIPTION("MAC address matching module for IPv6");