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e97c3e27 BS |
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> | |
07a93626 | 22 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
e97c3e27 BS |
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> | |
e97c3e27 | 28 | #include <net/netfilter/ipv6/nf_conntrack_ipv6.h> |
2fc72c7b KK |
29 | #endif |
30 | #include <net/netfilter/nf_conntrack_zones.h> | |
e97c3e27 BS |
31 | #include <net/netfilter/ipv6/nf_defrag_ipv6.h> |
32 | ||
834184b1 FW |
33 | static DEFINE_MUTEX(defrag6_mutex); |
34 | ||
e97c3e27 BS |
35 | static enum ip6_defrag_users nf_ct6_defrag_user(unsigned int hooknum, |
36 | struct sk_buff *skb) | |
37 | { | |
308ac914 | 38 | u16 zone_id = NF_CT_DEFAULT_ZONE_ID; |
07a93626 | 39 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
cb9c6836 | 40 | if (skb_nfct(skb)) { |
deedb590 DB |
41 | enum ip_conntrack_info ctinfo; |
42 | const struct nf_conn *ct = nf_ct_get(skb, &ctinfo); | |
43 | ||
44 | zone_id = nf_ct_zone_id(nf_ct_zone(ct), CTINFO2DIR(ctinfo)); | |
45 | } | |
2fc72c7b | 46 | #endif |
72b1e5e4 | 47 | if (nf_bridge_in_prerouting(skb)) |
308ac914 | 48 | return IP6_DEFRAG_CONNTRACK_BRIDGE_IN + zone_id; |
72b1e5e4 | 49 | |
e97c3e27 | 50 | if (hooknum == NF_INET_PRE_ROUTING) |
308ac914 | 51 | return IP6_DEFRAG_CONNTRACK_IN + zone_id; |
e97c3e27 | 52 | else |
308ac914 | 53 | return IP6_DEFRAG_CONNTRACK_OUT + zone_id; |
e97c3e27 BS |
54 | } |
55 | ||
06198b34 | 56 | static unsigned int ipv6_defrag(void *priv, |
e97c3e27 | 57 | struct sk_buff *skb, |
238e54c9 | 58 | const struct nf_hook_state *state) |
e97c3e27 | 59 | { |
daaa7d64 | 60 | int err; |
e97c3e27 | 61 | |
07a93626 | 62 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
e97c3e27 | 63 | /* Previously seen (loopback)? */ |
cb9c6836 | 64 | if (skb_nfct(skb) && !nf_ct_is_template((struct nf_conn *)skb_nfct(skb))) |
e97c3e27 | 65 | return NF_ACCEPT; |
2fc72c7b | 66 | #endif |
e97c3e27 | 67 | |
daaa7d64 FW |
68 | err = nf_ct_frag6_gather(state->net, skb, |
69 | nf_ct6_defrag_user(state->hook, skb)); | |
e97c3e27 | 70 | /* queued */ |
daaa7d64 | 71 | if (err == -EINPROGRESS) |
e97c3e27 BS |
72 | return NF_STOLEN; |
73 | ||
9b57da06 | 74 | return err == 0 ? NF_ACCEPT : NF_DROP; |
e97c3e27 BS |
75 | } |
76 | ||
591bb278 | 77 | static const struct nf_hook_ops ipv6_defrag_ops[] = { |
e97c3e27 BS |
78 | { |
79 | .hook = ipv6_defrag, | |
e97c3e27 BS |
80 | .pf = NFPROTO_IPV6, |
81 | .hooknum = NF_INET_PRE_ROUTING, | |
82 | .priority = NF_IP6_PRI_CONNTRACK_DEFRAG, | |
83 | }, | |
84 | { | |
85 | .hook = ipv6_defrag, | |
e97c3e27 BS |
86 | .pf = NFPROTO_IPV6, |
87 | .hooknum = NF_INET_LOCAL_OUT, | |
88 | .priority = NF_IP6_PRI_CONNTRACK_DEFRAG, | |
89 | }, | |
90 | }; | |
91 | ||
834184b1 FW |
92 | static void __net_exit defrag6_net_exit(struct net *net) |
93 | { | |
94 | if (net->nf.defrag_ipv6) { | |
95 | nf_unregister_net_hooks(net, ipv6_defrag_ops, | |
96 | ARRAY_SIZE(ipv6_defrag_ops)); | |
97 | net->nf.defrag_ipv6 = false; | |
98 | } | |
99 | } | |
100 | ||
101 | static struct pernet_operations defrag6_net_ops = { | |
102 | .exit = defrag6_net_exit, | |
103 | }; | |
104 | ||
e97c3e27 BS |
105 | static int __init nf_defrag_init(void) |
106 | { | |
107 | int ret = 0; | |
108 | ||
109 | ret = nf_ct_frag6_init(); | |
110 | if (ret < 0) { | |
111 | pr_err("nf_defrag_ipv6: can't initialize frag6.\n"); | |
112 | return ret; | |
113 | } | |
834184b1 | 114 | ret = register_pernet_subsys(&defrag6_net_ops); |
e97c3e27 | 115 | if (ret < 0) { |
834184b1 | 116 | pr_err("nf_defrag_ipv6: can't register pernet ops\n"); |
e97c3e27 BS |
117 | goto cleanup_frag6; |
118 | } | |
119 | return ret; | |
120 | ||
121 | cleanup_frag6: | |
122 | nf_ct_frag6_cleanup(); | |
123 | return ret; | |
124 | ||
125 | } | |
126 | ||
127 | static void __exit nf_defrag_fini(void) | |
128 | { | |
834184b1 | 129 | unregister_pernet_subsys(&defrag6_net_ops); |
e97c3e27 BS |
130 | nf_ct_frag6_cleanup(); |
131 | } | |
132 | ||
834184b1 | 133 | int nf_defrag_ipv6_enable(struct net *net) |
e97c3e27 | 134 | { |
834184b1 FW |
135 | int err = 0; |
136 | ||
137 | might_sleep(); | |
138 | ||
139 | if (net->nf.defrag_ipv6) | |
140 | return 0; | |
141 | ||
142 | mutex_lock(&defrag6_mutex); | |
143 | if (net->nf.defrag_ipv6) | |
144 | goto out_unlock; | |
145 | ||
146 | err = nf_register_net_hooks(net, ipv6_defrag_ops, | |
147 | ARRAY_SIZE(ipv6_defrag_ops)); | |
148 | if (err == 0) | |
149 | net->nf.defrag_ipv6 = true; | |
150 | ||
151 | out_unlock: | |
152 | mutex_unlock(&defrag6_mutex); | |
153 | return err; | |
e97c3e27 BS |
154 | } |
155 | EXPORT_SYMBOL_GPL(nf_defrag_ipv6_enable); | |
156 | ||
157 | module_init(nf_defrag_init); | |
158 | module_exit(nf_defrag_fini); | |
159 | ||
160 | MODULE_LICENSE("GPL"); |