Balazs Scheidler | e97c3e2 | 2010-10-21 16:03:43 +0200 | [diff] [blame] | 1 | /* (C) 1999-2001 Paul `Rusty' Russell |
| 2 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/types.h> |
| 10 | #include <linux/ipv6.h> |
| 11 | #include <linux/in6.h> |
| 12 | #include <linux/netfilter.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/skbuff.h> |
| 15 | #include <linux/icmp.h> |
| 16 | #include <linux/sysctl.h> |
| 17 | #include <net/ipv6.h> |
| 18 | #include <net/inet_frag.h> |
| 19 | |
| 20 | #include <linux/netfilter_ipv6.h> |
| 21 | #include <linux/netfilter_bridge.h> |
Amerigo Wang | 07a9362 | 2012-10-29 16:23:10 +0000 | [diff] [blame] | 22 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
Balazs Scheidler | e97c3e2 | 2010-10-21 16:03:43 +0200 | [diff] [blame] | 23 | #include <net/netfilter/nf_conntrack.h> |
| 24 | #include <net/netfilter/nf_conntrack_helper.h> |
| 25 | #include <net/netfilter/nf_conntrack_l4proto.h> |
| 26 | #include <net/netfilter/nf_conntrack_l3proto.h> |
| 27 | #include <net/netfilter/nf_conntrack_core.h> |
Balazs Scheidler | e97c3e2 | 2010-10-21 16:03:43 +0200 | [diff] [blame] | 28 | #include <net/netfilter/ipv6/nf_conntrack_ipv6.h> |
KOVACS Krisztian | 2fc72c7 | 2011-01-12 20:25:08 +0100 | [diff] [blame] | 29 | #endif |
| 30 | #include <net/netfilter/nf_conntrack_zones.h> |
Balazs Scheidler | e97c3e2 | 2010-10-21 16:03:43 +0200 | [diff] [blame] | 31 | #include <net/netfilter/ipv6/nf_defrag_ipv6.h> |
| 32 | |
| 33 | static enum ip6_defrag_users nf_ct6_defrag_user(unsigned int hooknum, |
| 34 | struct sk_buff *skb) |
| 35 | { |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 36 | u16 zone_id = NF_CT_DEFAULT_ZONE_ID; |
Amerigo Wang | 07a9362 | 2012-10-29 16:23:10 +0000 | [diff] [blame] | 37 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
Daniel Borkmann | deedb59 | 2015-08-14 16:03:39 +0200 | [diff] [blame] | 38 | if (skb->nfct) { |
| 39 | enum ip_conntrack_info ctinfo; |
| 40 | const struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
| 41 | |
| 42 | zone_id = nf_ct_zone_id(nf_ct_zone(ct), CTINFO2DIR(ctinfo)); |
| 43 | } |
KOVACS Krisztian | 2fc72c7 | 2011-01-12 20:25:08 +0100 | [diff] [blame] | 44 | #endif |
Florian Westphal | 72b1e5e | 2015-07-23 16:21:30 +0200 | [diff] [blame] | 45 | if (nf_bridge_in_prerouting(skb)) |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 46 | return IP6_DEFRAG_CONNTRACK_BRIDGE_IN + zone_id; |
Florian Westphal | 72b1e5e | 2015-07-23 16:21:30 +0200 | [diff] [blame] | 47 | |
Balazs Scheidler | e97c3e2 | 2010-10-21 16:03:43 +0200 | [diff] [blame] | 48 | if (hooknum == NF_INET_PRE_ROUTING) |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 49 | return IP6_DEFRAG_CONNTRACK_IN + zone_id; |
Balazs Scheidler | e97c3e2 | 2010-10-21 16:03:43 +0200 | [diff] [blame] | 50 | else |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 51 | return IP6_DEFRAG_CONNTRACK_OUT + zone_id; |
Balazs Scheidler | e97c3e2 | 2010-10-21 16:03:43 +0200 | [diff] [blame] | 52 | } |
| 53 | |
Eric W. Biederman | 06198b3 | 2015-09-18 14:33:06 -0500 | [diff] [blame] | 54 | static unsigned int ipv6_defrag(void *priv, |
Balazs Scheidler | e97c3e2 | 2010-10-21 16:03:43 +0200 | [diff] [blame] | 55 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 56 | const struct nf_hook_state *state) |
Balazs Scheidler | e97c3e2 | 2010-10-21 16:03:43 +0200 | [diff] [blame] | 57 | { |
Florian Westphal | daaa7d6 | 2015-11-18 23:32:40 +0100 | [diff] [blame] | 58 | int err; |
Balazs Scheidler | e97c3e2 | 2010-10-21 16:03:43 +0200 | [diff] [blame] | 59 | |
Amerigo Wang | 07a9362 | 2012-10-29 16:23:10 +0000 | [diff] [blame] | 60 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
Balazs Scheidler | e97c3e2 | 2010-10-21 16:03:43 +0200 | [diff] [blame] | 61 | /* Previously seen (loopback)? */ |
| 62 | if (skb->nfct && !nf_ct_is_template((struct nf_conn *)skb->nfct)) |
| 63 | return NF_ACCEPT; |
KOVACS Krisztian | 2fc72c7 | 2011-01-12 20:25:08 +0100 | [diff] [blame] | 64 | #endif |
Balazs Scheidler | e97c3e2 | 2010-10-21 16:03:43 +0200 | [diff] [blame] | 65 | |
Florian Westphal | daaa7d6 | 2015-11-18 23:32:40 +0100 | [diff] [blame] | 66 | err = nf_ct_frag6_gather(state->net, skb, |
| 67 | nf_ct6_defrag_user(state->hook, skb)); |
Balazs Scheidler | e97c3e2 | 2010-10-21 16:03:43 +0200 | [diff] [blame] | 68 | /* queued */ |
Florian Westphal | daaa7d6 | 2015-11-18 23:32:40 +0100 | [diff] [blame] | 69 | if (err == -EINPROGRESS) |
Balazs Scheidler | e97c3e2 | 2010-10-21 16:03:43 +0200 | [diff] [blame] | 70 | return NF_STOLEN; |
| 71 | |
Florian Westphal | 9b57da0 | 2016-11-29 02:17:34 +0100 | [diff] [blame] | 72 | return err == 0 ? NF_ACCEPT : NF_DROP; |
Balazs Scheidler | e97c3e2 | 2010-10-21 16:03:43 +0200 | [diff] [blame] | 73 | } |
| 74 | |
| 75 | static struct nf_hook_ops ipv6_defrag_ops[] = { |
| 76 | { |
| 77 | .hook = ipv6_defrag, |
Balazs Scheidler | e97c3e2 | 2010-10-21 16:03:43 +0200 | [diff] [blame] | 78 | .pf = NFPROTO_IPV6, |
| 79 | .hooknum = NF_INET_PRE_ROUTING, |
| 80 | .priority = NF_IP6_PRI_CONNTRACK_DEFRAG, |
| 81 | }, |
| 82 | { |
| 83 | .hook = ipv6_defrag, |
Balazs Scheidler | e97c3e2 | 2010-10-21 16:03:43 +0200 | [diff] [blame] | 84 | .pf = NFPROTO_IPV6, |
| 85 | .hooknum = NF_INET_LOCAL_OUT, |
| 86 | .priority = NF_IP6_PRI_CONNTRACK_DEFRAG, |
| 87 | }, |
| 88 | }; |
| 89 | |
| 90 | static int __init nf_defrag_init(void) |
| 91 | { |
| 92 | int ret = 0; |
| 93 | |
| 94 | ret = nf_ct_frag6_init(); |
| 95 | if (ret < 0) { |
| 96 | pr_err("nf_defrag_ipv6: can't initialize frag6.\n"); |
| 97 | return ret; |
| 98 | } |
| 99 | ret = nf_register_hooks(ipv6_defrag_ops, ARRAY_SIZE(ipv6_defrag_ops)); |
| 100 | if (ret < 0) { |
| 101 | pr_err("nf_defrag_ipv6: can't register hooks\n"); |
| 102 | goto cleanup_frag6; |
| 103 | } |
| 104 | return ret; |
| 105 | |
| 106 | cleanup_frag6: |
| 107 | nf_ct_frag6_cleanup(); |
| 108 | return ret; |
| 109 | |
| 110 | } |
| 111 | |
| 112 | static void __exit nf_defrag_fini(void) |
| 113 | { |
| 114 | nf_unregister_hooks(ipv6_defrag_ops, ARRAY_SIZE(ipv6_defrag_ops)); |
| 115 | nf_ct_frag6_cleanup(); |
| 116 | } |
| 117 | |
| 118 | void nf_defrag_ipv6_enable(void) |
| 119 | { |
| 120 | } |
| 121 | EXPORT_SYMBOL_GPL(nf_defrag_ipv6_enable); |
| 122 | |
| 123 | module_init(nf_defrag_init); |
| 124 | module_exit(nf_defrag_fini); |
| 125 | |
| 126 | MODULE_LICENSE("GPL"); |