| #include <linux/kernel.h> |
| #include <linux/init.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> |
| #include <net/xfrm.h> |
| #include <net/ip6_checksum.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, |
| .mark = skb->mark, |
| .nl_u = |
| { .ip6_u = |
| { .daddr = iph->daddr, |
| .saddr = iph->saddr, } }, |
| }; |
| |
| dst = ip6_route_output(skb->sk, &fl); |
| |
| #ifdef CONFIG_XFRM |
| if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) && |
| xfrm_decode_session(skb, &fl, AF_INET6) == 0) |
| if (xfrm_lookup(&skb->dst, &fl, skb->sk, 0)) |
| return -1; |
| #endif |
| |
| if (dst->error) { |
| IP6_INC_STATS(ip6_dst_idev(dst), 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 nf_ip6_saveroute(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 nf_ip6_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; |
| } |
| |
| __sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook, |
| unsigned int dataoff, u_int8_t protocol) |
| { |
| struct ipv6hdr *ip6h = skb->nh.ipv6h; |
| __sum16 csum = 0; |
| |
| switch (skb->ip_summed) { |
| case CHECKSUM_COMPLETE: |
| if (hook != NF_IP6_PRE_ROUTING && hook != NF_IP6_LOCAL_IN) |
| break; |
| if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, |
| skb->len - dataoff, protocol, |
| csum_sub(skb->csum, |
| skb_checksum(skb, 0, |
| dataoff, 0)))) { |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| break; |
| } |
| /* fall through */ |
| case CHECKSUM_NONE: |
| skb->csum = ~csum_unfold( |
| csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, |
| skb->len - dataoff, |
| protocol, |
| csum_sub(0, |
| skb_checksum(skb, 0, |
| dataoff, 0)))); |
| csum = __skb_checksum_complete(skb); |
| } |
| return csum; |
| } |
| |
| EXPORT_SYMBOL(nf_ip6_checksum); |
| |
| static struct nf_afinfo nf_ip6_afinfo = { |
| .family = AF_INET6, |
| .checksum = nf_ip6_checksum, |
| .saveroute = nf_ip6_saveroute, |
| .reroute = nf_ip6_reroute, |
| .route_key_size = sizeof(struct ip6_rt_info), |
| }; |
| |
| int __init ipv6_netfilter_init(void) |
| { |
| return nf_register_afinfo(&nf_ip6_afinfo); |
| } |
| |
| /* This can be called from inet6_init() on errors, so it cannot |
| * be marked __exit. -DaveM |
| */ |
| void ipv6_netfilter_fini(void) |
| { |
| nf_unregister_afinfo(&nf_ip6_afinfo); |
| } |