105 строки
2.1 KiB
C
105 строки
2.1 KiB
C
#include <linux/config.h>
|
|
#include <linux/init.h>
|
|
|
|
#ifdef CONFIG_NETFILTER
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/ipv6.h>
|
|
#include <linux/netfilter.h>
|
|
#include <linux/netfilter_ipv6.h>
|
|
#include <net/dst.h>
|
|
#include <net/ipv6.h>
|
|
#include <net/ip6_route.h>
|
|
|
|
int ip6_route_me_harder(struct sk_buff *skb)
|
|
{
|
|
struct ipv6hdr *iph = skb->nh.ipv6h;
|
|
struct dst_entry *dst;
|
|
struct flowi fl = {
|
|
.oif = skb->sk ? skb->sk->sk_bound_dev_if : 0,
|
|
.nl_u =
|
|
{ .ip6_u =
|
|
{ .daddr = iph->daddr,
|
|
.saddr = iph->saddr, } },
|
|
.proto = iph->nexthdr,
|
|
};
|
|
|
|
dst = ip6_route_output(skb->sk, &fl);
|
|
|
|
if (dst->error) {
|
|
IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
|
|
LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n");
|
|
dst_release(dst);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Drop old route. */
|
|
dst_release(skb->dst);
|
|
|
|
skb->dst = dst;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(ip6_route_me_harder);
|
|
|
|
/*
|
|
* Extra routing may needed on local out, as the QUEUE target never
|
|
* returns control to the table.
|
|
*/
|
|
|
|
struct ip6_rt_info {
|
|
struct in6_addr daddr;
|
|
struct in6_addr saddr;
|
|
};
|
|
|
|
static void save(const struct sk_buff *skb, struct nf_info *info)
|
|
{
|
|
struct ip6_rt_info *rt_info = nf_info_reroute(info);
|
|
|
|
if (info->hook == NF_IP6_LOCAL_OUT) {
|
|
struct ipv6hdr *iph = skb->nh.ipv6h;
|
|
|
|
rt_info->daddr = iph->daddr;
|
|
rt_info->saddr = iph->saddr;
|
|
}
|
|
}
|
|
|
|
static int reroute(struct sk_buff **pskb, const struct nf_info *info)
|
|
{
|
|
struct ip6_rt_info *rt_info = nf_info_reroute(info);
|
|
|
|
if (info->hook == NF_IP6_LOCAL_OUT) {
|
|
struct ipv6hdr *iph = (*pskb)->nh.ipv6h;
|
|
if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) ||
|
|
!ipv6_addr_equal(&iph->saddr, &rt_info->saddr))
|
|
return ip6_route_me_harder(*pskb);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct nf_queue_rerouter ip6_reroute = {
|
|
.rer_size = sizeof(struct ip6_rt_info),
|
|
.save = &save,
|
|
.reroute = &reroute,
|
|
};
|
|
|
|
int __init ipv6_netfilter_init(void)
|
|
{
|
|
return nf_register_queue_rerouter(PF_INET6, &ip6_reroute);
|
|
}
|
|
|
|
void ipv6_netfilter_fini(void)
|
|
{
|
|
nf_unregister_queue_rerouter(PF_INET6);
|
|
}
|
|
|
|
#else /* CONFIG_NETFILTER */
|
|
int __init ipv6_netfilter_init(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
void ipv6_netfilter_fini(void)
|
|
{
|
|
}
|
|
#endif /* CONFIG_NETFILTER */
|