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