Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 1 | #include <linux/kernel.h> |
Patrick McHardy | bb94aa1 | 2006-01-09 16:43:13 -0800 | [diff] [blame] | 2 | #include <linux/init.h> |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 3 | #include <linux/ipv6.h> |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 4 | #include <linux/netfilter.h> |
| 5 | #include <linux/netfilter_ipv6.h> |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 6 | #include <net/dst.h> |
| 7 | #include <net/ipv6.h> |
| 8 | #include <net/ip6_route.h> |
Patrick McHardy | 3e3850e | 2006-01-06 23:04:54 -0800 | [diff] [blame] | 9 | #include <net/xfrm.h> |
Brian Haley | 503e4fa | 2006-04-07 15:00:06 -0700 | [diff] [blame] | 10 | #include <net/ip6_checksum.h> |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 11 | |
| 12 | int ip6_route_me_harder(struct sk_buff *skb) |
| 13 | { |
| 14 | struct ipv6hdr *iph = skb->nh.ipv6h; |
| 15 | struct dst_entry *dst; |
| 16 | struct flowi fl = { |
| 17 | .oif = skb->sk ? skb->sk->sk_bound_dev_if : 0, |
| 18 | .nl_u = |
| 19 | { .ip6_u = |
| 20 | { .daddr = iph->daddr, |
| 21 | .saddr = iph->saddr, } }, |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 22 | }; |
| 23 | |
| 24 | dst = ip6_route_output(skb->sk, &fl); |
| 25 | |
Patrick McHardy | 3e3850e | 2006-01-06 23:04:54 -0800 | [diff] [blame] | 26 | #ifdef CONFIG_XFRM |
| 27 | if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) && |
| 28 | xfrm_decode_session(skb, &fl, AF_INET6) == 0) |
| 29 | if (xfrm_lookup(&skb->dst, &fl, skb->sk, 0)) |
| 30 | return -1; |
| 31 | #endif |
| 32 | |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 33 | if (dst->error) { |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame^] | 34 | IP6_INC_STATS(ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 35 | LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n"); |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 36 | dst_release(dst); |
| 37 | return -EINVAL; |
| 38 | } |
| 39 | |
| 40 | /* Drop old route. */ |
| 41 | dst_release(skb->dst); |
| 42 | |
| 43 | skb->dst = dst; |
| 44 | return 0; |
| 45 | } |
| 46 | EXPORT_SYMBOL(ip6_route_me_harder); |
| 47 | |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 48 | /* |
| 49 | * Extra routing may needed on local out, as the QUEUE target never |
| 50 | * returns control to the table. |
| 51 | */ |
| 52 | |
| 53 | struct ip6_rt_info { |
| 54 | struct in6_addr daddr; |
| 55 | struct in6_addr saddr; |
| 56 | }; |
| 57 | |
Patrick McHardy | bce8032 | 2006-04-06 14:18:09 -0700 | [diff] [blame] | 58 | static void nf_ip6_saveroute(const struct sk_buff *skb, struct nf_info *info) |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 59 | { |
| 60 | struct ip6_rt_info *rt_info = nf_info_reroute(info); |
| 61 | |
| 62 | if (info->hook == NF_IP6_LOCAL_OUT) { |
| 63 | struct ipv6hdr *iph = skb->nh.ipv6h; |
| 64 | |
| 65 | rt_info->daddr = iph->daddr; |
| 66 | rt_info->saddr = iph->saddr; |
| 67 | } |
| 68 | } |
| 69 | |
Patrick McHardy | bce8032 | 2006-04-06 14:18:09 -0700 | [diff] [blame] | 70 | static int nf_ip6_reroute(struct sk_buff **pskb, const struct nf_info *info) |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 71 | { |
| 72 | struct ip6_rt_info *rt_info = nf_info_reroute(info); |
| 73 | |
| 74 | if (info->hook == NF_IP6_LOCAL_OUT) { |
| 75 | struct ipv6hdr *iph = (*pskb)->nh.ipv6h; |
| 76 | if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) || |
| 77 | !ipv6_addr_equal(&iph->saddr, &rt_info->saddr)) |
| 78 | return ip6_route_me_harder(*pskb); |
| 79 | } |
| 80 | return 0; |
| 81 | } |
| 82 | |
Patrick McHardy | 422c346 | 2006-04-06 14:18:43 -0700 | [diff] [blame] | 83 | unsigned int nf_ip6_checksum(struct sk_buff *skb, unsigned int hook, |
| 84 | unsigned int dataoff, u_int8_t protocol) |
| 85 | { |
| 86 | struct ipv6hdr *ip6h = skb->nh.ipv6h; |
| 87 | unsigned int csum = 0; |
| 88 | |
| 89 | switch (skb->ip_summed) { |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 90 | case CHECKSUM_COMPLETE: |
Patrick McHardy | 422c346 | 2006-04-06 14:18:43 -0700 | [diff] [blame] | 91 | if (hook != NF_IP6_PRE_ROUTING && hook != NF_IP6_LOCAL_IN) |
| 92 | break; |
| 93 | if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, |
| 94 | skb->len - dataoff, protocol, |
| 95 | csum_sub(skb->csum, |
| 96 | skb_checksum(skb, 0, |
| 97 | dataoff, 0)))) { |
| 98 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 99 | break; |
| 100 | } |
| 101 | /* fall through */ |
| 102 | case CHECKSUM_NONE: |
| 103 | skb->csum = ~csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, |
| 104 | skb->len - dataoff, |
| 105 | protocol, |
| 106 | csum_sub(0, |
| 107 | skb_checksum(skb, 0, |
| 108 | dataoff, 0))); |
| 109 | csum = __skb_checksum_complete(skb); |
| 110 | } |
| 111 | return csum; |
| 112 | } |
| 113 | |
| 114 | EXPORT_SYMBOL(nf_ip6_checksum); |
| 115 | |
Patrick McHardy | bce8032 | 2006-04-06 14:18:09 -0700 | [diff] [blame] | 116 | static struct nf_afinfo nf_ip6_afinfo = { |
| 117 | .family = AF_INET6, |
Patrick McHardy | 422c346 | 2006-04-06 14:18:43 -0700 | [diff] [blame] | 118 | .checksum = nf_ip6_checksum, |
Patrick McHardy | bce8032 | 2006-04-06 14:18:09 -0700 | [diff] [blame] | 119 | .saveroute = nf_ip6_saveroute, |
| 120 | .reroute = nf_ip6_reroute, |
| 121 | .route_key_size = sizeof(struct ip6_rt_info), |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 122 | }; |
| 123 | |
| 124 | int __init ipv6_netfilter_init(void) |
| 125 | { |
Patrick McHardy | bce8032 | 2006-04-06 14:18:09 -0700 | [diff] [blame] | 126 | return nf_register_afinfo(&nf_ip6_afinfo); |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 127 | } |
| 128 | |
David S. Miller | 5bf887f | 2006-01-10 21:02:21 -0800 | [diff] [blame] | 129 | /* This can be called from inet6_init() on errors, so it cannot |
| 130 | * be marked __exit. -DaveM |
| 131 | */ |
| 132 | void ipv6_netfilter_fini(void) |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 133 | { |
Patrick McHardy | bce8032 | 2006-04-06 14:18:09 -0700 | [diff] [blame] | 134 | nf_unregister_afinfo(&nf_ip6_afinfo); |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 135 | } |