Patrick McHardy | f229f6c | 2013-04-06 15:24:29 +0200 | [diff] [blame] | 1 | /* |
| 2 | * IPv6 specific functions of netfilter core |
| 3 | * |
| 4 | * Rusty Russell (C) 2000 -- This code is GPL. |
| 5 | * Patrick McHardy (C) 2006-2012 |
| 6 | */ |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 7 | #include <linux/kernel.h> |
Patrick McHardy | bb94aa1 | 2006-01-09 16:43:13 -0800 | [diff] [blame] | 8 | #include <linux/init.h> |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 9 | #include <linux/ipv6.h> |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 10 | #include <linux/netfilter.h> |
| 11 | #include <linux/netfilter_ipv6.h> |
Paul Gortmaker | bc3b2d7 | 2011-07-15 11:47:34 -0400 | [diff] [blame] | 12 | #include <linux/export.h> |
Florian Westphal | 2a7851b | 2013-05-17 03:56:10 +0000 | [diff] [blame] | 13 | #include <net/addrconf.h> |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 14 | #include <net/dst.h> |
| 15 | #include <net/ipv6.h> |
| 16 | #include <net/ip6_route.h> |
Patrick McHardy | 3e3850e | 2006-01-06 23:04:54 -0800 | [diff] [blame] | 17 | #include <net/xfrm.h> |
Patrick McHardy | c01cd42 | 2007-12-05 01:24:48 -0800 | [diff] [blame] | 18 | #include <net/netfilter/nf_queue.h> |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 19 | |
Eric W. Biederman | 5f5d74d | 2015-09-25 15:07:31 -0500 | [diff] [blame] | 20 | int ip6_route_me_harder(struct net *net, struct sk_buff *skb) |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 21 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 22 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
Eric Dumazet | 7d98386 | 2018-02-25 11:49:07 -0800 | [diff] [blame] | 23 | struct sock *sk = sk_to_full_sk(skb->sk); |
Patrick McHardy | 0ad352c | 2012-08-26 19:14:08 +0200 | [diff] [blame] | 24 | unsigned int hh_len; |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 25 | struct dst_entry *dst; |
Eli Cooper | 783359c | 2019-01-21 18:45:27 +0800 | [diff] [blame] | 26 | int strict = (ipv6_addr_type(&iph->daddr) & |
| 27 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 28 | struct flowi6 fl6 = { |
Alin Nastac | 9838090 | 2018-11-21 14:00:30 +0100 | [diff] [blame] | 29 | .flowi6_oif = sk && sk->sk_bound_dev_if ? sk->sk_bound_dev_if : |
Eli Cooper | 783359c | 2019-01-21 18:45:27 +0800 | [diff] [blame] | 30 | strict ? skb_dst(skb)->dev->ifindex : 0, |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 31 | .flowi6_mark = skb->mark, |
Eric Dumazet | 7d98386 | 2018-02-25 11:49:07 -0800 | [diff] [blame] | 32 | .flowi6_uid = sock_net_uid(net, sk), |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 33 | .daddr = iph->daddr, |
| 34 | .saddr = iph->saddr, |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 35 | }; |
Sergey Popovich | a8951d5 | 2014-05-08 16:22:35 +0300 | [diff] [blame] | 36 | int err; |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 37 | |
Eric Dumazet | 7d98386 | 2018-02-25 11:49:07 -0800 | [diff] [blame] | 38 | dst = ip6_route_output(net, sk, &fl6); |
Sergey Popovich | a8951d5 | 2014-05-08 16:22:35 +0300 | [diff] [blame] | 39 | err = dst->error; |
| 40 | if (err) { |
Alexey Dobriyan | eef9d90 | 2008-10-14 22:55:21 -0700 | [diff] [blame] | 41 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 42 | net_dbg_ratelimited("ip6_route_me_harder: No more route\n"); |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 43 | dst_release(dst); |
Sergey Popovich | a8951d5 | 2014-05-08 16:22:35 +0300 | [diff] [blame] | 44 | return err; |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 45 | } |
| 46 | |
| 47 | /* Drop old route. */ |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 48 | skb_dst_drop(skb); |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 49 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 50 | skb_dst_set(skb, dst); |
Ulrich Weber | 90348e0 | 2010-04-15 12:37:18 +0200 | [diff] [blame] | 51 | |
| 52 | #ifdef CONFIG_XFRM |
| 53 | if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) && |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 54 | xfrm_decode_session(skb, flowi6_to_flowi(&fl6), AF_INET6) == 0) { |
Ulrich Weber | 90348e0 | 2010-04-15 12:37:18 +0200 | [diff] [blame] | 55 | skb_dst_set(skb, NULL); |
Eric Dumazet | 7d98386 | 2018-02-25 11:49:07 -0800 | [diff] [blame] | 56 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); |
David S. Miller | 452edd5 | 2011-03-02 13:27:41 -0800 | [diff] [blame] | 57 | if (IS_ERR(dst)) |
Patrick McHardy | 58e35d1 | 2013-04-05 06:41:11 +0000 | [diff] [blame] | 58 | return PTR_ERR(dst); |
Ulrich Weber | 90348e0 | 2010-04-15 12:37:18 +0200 | [diff] [blame] | 59 | skb_dst_set(skb, dst); |
| 60 | } |
| 61 | #endif |
| 62 | |
Patrick McHardy | 0ad352c | 2012-08-26 19:14:08 +0200 | [diff] [blame] | 63 | /* Change in oif may mean change in hh_len. */ |
| 64 | hh_len = skb_dst(skb)->dev->hard_header_len; |
| 65 | if (skb_headroom(skb) < hh_len && |
| 66 | pskb_expand_head(skb, HH_DATA_ALIGN(hh_len - skb_headroom(skb)), |
| 67 | 0, GFP_ATOMIC)) |
Patrick McHardy | 58e35d1 | 2013-04-05 06:41:11 +0000 | [diff] [blame] | 68 | return -ENOMEM; |
Patrick McHardy | 0ad352c | 2012-08-26 19:14:08 +0200 | [diff] [blame] | 69 | |
Harald Welte | 020b4c1 | 2005-08-09 19:39:00 -0700 | [diff] [blame] | 70 | return 0; |
| 71 | } |
| 72 | EXPORT_SYMBOL(ip6_route_me_harder); |
| 73 | |
Pablo Neira Ayuso | ce388f4 | 2017-11-27 22:50:26 +0100 | [diff] [blame] | 74 | static int nf_ip6_reroute(struct sk_buff *skb, |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 75 | const struct nf_queue_entry *entry) |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 76 | { |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 77 | struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry); |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 78 | |
David S. Miller | 1d1de89 | 2015-04-03 16:31:01 -0400 | [diff] [blame] | 79 | if (entry->state.hook == NF_INET_LOCAL_OUT) { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 80 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 81 | if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) || |
Eric Leblond | 9f40ac7 | 2008-11-25 12:18:11 +0100 | [diff] [blame] | 82 | !ipv6_addr_equal(&iph->saddr, &rt_info->saddr) || |
| 83 | skb->mark != rt_info->mark) |
Pablo Neira Ayuso | ce388f4 | 2017-11-27 22:50:26 +0100 | [diff] [blame] | 84 | return ip6_route_me_harder(entry->state.net, skb); |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 85 | } |
| 86 | return 0; |
| 87 | } |
| 88 | |
Florian Westphal | 31ad3dd | 2011-04-04 16:56:29 +0200 | [diff] [blame] | 89 | static int nf_ip6_route(struct net *net, struct dst_entry **dst, |
Florian Westphal | 0fae2e7 | 2011-04-04 17:00:54 +0200 | [diff] [blame] | 90 | struct flowi *fl, bool strict) |
Patrick McHardy | 1841a4c | 2007-12-05 01:22:05 -0800 | [diff] [blame] | 91 | { |
Florian Westphal | 0fae2e7 | 2011-04-04 17:00:54 +0200 | [diff] [blame] | 92 | static const struct ipv6_pinfo fake_pinfo; |
| 93 | static const struct inet_sock fake_sk = { |
| 94 | /* makes ip6_route_output set RT6_LOOKUP_F_IFACE: */ |
| 95 | .sk.sk_bound_dev_if = 1, |
| 96 | .pinet6 = (struct ipv6_pinfo *) &fake_pinfo, |
| 97 | }; |
| 98 | const void *sk = strict ? &fake_sk : NULL; |
Florian Westphal | 2dad81a | 2011-10-19 13:23:06 +0200 | [diff] [blame] | 99 | struct dst_entry *result; |
| 100 | int err; |
Florian Westphal | 0fae2e7 | 2011-04-04 17:00:54 +0200 | [diff] [blame] | 101 | |
Florian Westphal | 2dad81a | 2011-10-19 13:23:06 +0200 | [diff] [blame] | 102 | result = ip6_route_output(net, sk, &fl->u.ip6); |
| 103 | err = result->error; |
| 104 | if (err) |
| 105 | dst_release(result); |
| 106 | else |
| 107 | *dst = result; |
| 108 | return err; |
Patrick McHardy | 1841a4c | 2007-12-05 01:22:05 -0800 | [diff] [blame] | 109 | } |
| 110 | |
Florian Westphal | 2a7851b | 2013-05-17 03:56:10 +0000 | [diff] [blame] | 111 | static const struct nf_ipv6_ops ipv6ops = { |
Pablo Neira Ayuso | f7dcbe2 | 2017-12-20 16:04:18 +0100 | [diff] [blame] | 112 | .chk_addr = ipv6_chk_addr, |
| 113 | .route_input = ip6_route_input, |
| 114 | .fragment = ip6_fragment, |
Pablo Neira Ayuso | 3f87c08 | 2017-11-27 22:29:52 +0100 | [diff] [blame] | 115 | .route = nf_ip6_route, |
Pablo Neira Ayuso | ce388f4 | 2017-11-27 22:50:26 +0100 | [diff] [blame] | 116 | .reroute = nf_ip6_reroute, |
Florian Westphal | 2a7851b | 2013-05-17 03:56:10 +0000 | [diff] [blame] | 117 | }; |
| 118 | |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 119 | int __init ipv6_netfilter_init(void) |
| 120 | { |
Florian Westphal | 2a7851b | 2013-05-17 03:56:10 +0000 | [diff] [blame] | 121 | RCU_INIT_POINTER(nf_ipv6_ops, &ipv6ops); |
Pablo Neira Ayuso | b3a6125 | 2017-12-09 17:05:53 +0100 | [diff] [blame] | 122 | return 0; |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 123 | } |
| 124 | |
David S. Miller | 5bf887f | 2006-01-10 21:02:21 -0800 | [diff] [blame] | 125 | /* This can be called from inet6_init() on errors, so it cannot |
| 126 | * be marked __exit. -DaveM |
| 127 | */ |
| 128 | void ipv6_netfilter_fini(void) |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 129 | { |
Florian Westphal | 2a7851b | 2013-05-17 03:56:10 +0000 | [diff] [blame] | 130 | RCU_INIT_POINTER(nf_ipv6_ops, NULL); |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 131 | } |