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> |
Patrick McHardy | c01cd42 | 2007-12-05 01:24:48 -0800 | [diff] [blame] | 11 | #include <net/netfilter/nf_queue.h> |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 12 | |
| 13 | int ip6_route_me_harder(struct sk_buff *skb) |
| 14 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 15 | struct ipv6hdr *iph = ipv6_hdr(skb); |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 16 | struct dst_entry *dst; |
| 17 | struct flowi fl = { |
| 18 | .oif = skb->sk ? skb->sk->sk_bound_dev_if : 0, |
Yasuyuki Kozakai | bc5f774 | 2007-03-04 16:00:32 -0800 | [diff] [blame] | 19 | .mark = skb->mark, |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 20 | .nl_u = |
| 21 | { .ip6_u = |
| 22 | { .daddr = iph->daddr, |
| 23 | .saddr = iph->saddr, } }, |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 24 | }; |
| 25 | |
| 26 | dst = ip6_route_output(skb->sk, &fl); |
| 27 | |
Patrick McHardy | 3e3850e | 2006-01-06 23:04:54 -0800 | [diff] [blame] | 28 | #ifdef CONFIG_XFRM |
| 29 | if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) && |
| 30 | xfrm_decode_session(skb, &fl, AF_INET6) == 0) |
| 31 | if (xfrm_lookup(&skb->dst, &fl, skb->sk, 0)) |
| 32 | return -1; |
| 33 | #endif |
| 34 | |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 35 | if (dst->error) { |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 36 | IP6_INC_STATS(ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 37 | LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n"); |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 38 | dst_release(dst); |
| 39 | return -EINVAL; |
| 40 | } |
| 41 | |
| 42 | /* Drop old route. */ |
| 43 | dst_release(skb->dst); |
| 44 | |
| 45 | skb->dst = dst; |
| 46 | return 0; |
| 47 | } |
| 48 | EXPORT_SYMBOL(ip6_route_me_harder); |
| 49 | |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 50 | /* |
| 51 | * Extra routing may needed on local out, as the QUEUE target never |
| 52 | * returns control to the table. |
| 53 | */ |
| 54 | |
| 55 | struct ip6_rt_info { |
| 56 | struct in6_addr daddr; |
| 57 | struct in6_addr saddr; |
| 58 | }; |
| 59 | |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 60 | static void nf_ip6_saveroute(const struct sk_buff *skb, |
| 61 | struct nf_queue_entry *entry) |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 62 | { |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 63 | struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry); |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 64 | |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 65 | if (entry->hook == NF_INET_LOCAL_OUT) { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 66 | struct ipv6hdr *iph = ipv6_hdr(skb); |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 67 | |
| 68 | rt_info->daddr = iph->daddr; |
| 69 | rt_info->saddr = iph->saddr; |
| 70 | } |
| 71 | } |
| 72 | |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 73 | static int nf_ip6_reroute(struct sk_buff *skb, |
| 74 | const struct nf_queue_entry *entry) |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 75 | { |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 76 | struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry); |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 77 | |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 78 | if (entry->hook == NF_INET_LOCAL_OUT) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 79 | struct ipv6hdr *iph = ipv6_hdr(skb); |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 80 | if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) || |
| 81 | !ipv6_addr_equal(&iph->saddr, &rt_info->saddr)) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 82 | return ip6_route_me_harder(skb); |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 83 | } |
| 84 | return 0; |
| 85 | } |
| 86 | |
Patrick McHardy | 1841a4c | 2007-12-05 01:22:05 -0800 | [diff] [blame] | 87 | static int nf_ip6_route(struct dst_entry **dst, struct flowi *fl) |
| 88 | { |
| 89 | *dst = ip6_route_output(NULL, fl); |
| 90 | return (*dst)->error; |
| 91 | } |
| 92 | |
Al Viro | b51655b | 2006-11-14 21:40:42 -0800 | [diff] [blame] | 93 | __sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook, |
Patrick McHardy | 422c346 | 2006-04-06 14:18:43 -0700 | [diff] [blame] | 94 | unsigned int dataoff, u_int8_t protocol) |
| 95 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 96 | struct ipv6hdr *ip6h = ipv6_hdr(skb); |
Al Viro | b51655b | 2006-11-14 21:40:42 -0800 | [diff] [blame] | 97 | __sum16 csum = 0; |
Patrick McHardy | 422c346 | 2006-04-06 14:18:43 -0700 | [diff] [blame] | 98 | |
| 99 | switch (skb->ip_summed) { |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 100 | case CHECKSUM_COMPLETE: |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 101 | if (hook != NF_INET_PRE_ROUTING && hook != NF_INET_LOCAL_IN) |
Patrick McHardy | 422c346 | 2006-04-06 14:18:43 -0700 | [diff] [blame] | 102 | break; |
| 103 | if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 104 | skb->len - dataoff, protocol, |
Patrick McHardy | 422c346 | 2006-04-06 14:18:43 -0700 | [diff] [blame] | 105 | csum_sub(skb->csum, |
| 106 | skb_checksum(skb, 0, |
| 107 | dataoff, 0)))) { |
| 108 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 109 | break; |
| 110 | } |
| 111 | /* fall through */ |
| 112 | case CHECKSUM_NONE: |
Al Viro | 868c86b | 2006-11-14 21:35:48 -0800 | [diff] [blame] | 113 | skb->csum = ~csum_unfold( |
| 114 | csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, |
Patrick McHardy | 422c346 | 2006-04-06 14:18:43 -0700 | [diff] [blame] | 115 | skb->len - dataoff, |
| 116 | protocol, |
| 117 | csum_sub(0, |
| 118 | skb_checksum(skb, 0, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 119 | dataoff, 0)))); |
Patrick McHardy | 422c346 | 2006-04-06 14:18:43 -0700 | [diff] [blame] | 120 | csum = __skb_checksum_complete(skb); |
| 121 | } |
| 122 | return csum; |
| 123 | } |
| 124 | |
| 125 | EXPORT_SYMBOL(nf_ip6_checksum); |
| 126 | |
Patrick McHardy | 1e796fd | 2007-12-17 22:42:27 -0800 | [diff] [blame] | 127 | static const struct nf_afinfo nf_ip6_afinfo = { |
Patrick McHardy | bce8032 | 2006-04-06 14:18:09 -0700 | [diff] [blame] | 128 | .family = AF_INET6, |
Patrick McHardy | 422c346 | 2006-04-06 14:18:43 -0700 | [diff] [blame] | 129 | .checksum = nf_ip6_checksum, |
Patrick McHardy | 1841a4c | 2007-12-05 01:22:05 -0800 | [diff] [blame] | 130 | .route = nf_ip6_route, |
Patrick McHardy | bce8032 | 2006-04-06 14:18:09 -0700 | [diff] [blame] | 131 | .saveroute = nf_ip6_saveroute, |
| 132 | .reroute = nf_ip6_reroute, |
| 133 | .route_key_size = sizeof(struct ip6_rt_info), |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 134 | }; |
| 135 | |
| 136 | int __init ipv6_netfilter_init(void) |
| 137 | { |
Patrick McHardy | bce8032 | 2006-04-06 14:18:09 -0700 | [diff] [blame] | 138 | return nf_register_afinfo(&nf_ip6_afinfo); |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 139 | } |
| 140 | |
David S. Miller | 5bf887f | 2006-01-10 21:02:21 -0800 | [diff] [blame] | 141 | /* This can be called from inet6_init() on errors, so it cannot |
| 142 | * be marked __exit. -DaveM |
| 143 | */ |
| 144 | void ipv6_netfilter_fini(void) |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 145 | { |
Patrick McHardy | bce8032 | 2006-04-06 14:18:09 -0700 | [diff] [blame] | 146 | nf_unregister_afinfo(&nf_ip6_afinfo); |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 147 | } |