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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 | ||
33 | static enum ip6_defrag_users nf_ct6_defrag_user(unsigned int hooknum, | |
34 | struct sk_buff *skb) | |
35 | { | |
36 | u16 zone = NF_CT_DEFAULT_ZONE; | |
37 | ||
07a93626 | 38 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
e97c3e27 BS |
39 | if (skb->nfct) |
40 | zone = nf_ct_zone((struct nf_conn *)skb->nfct); | |
2fc72c7b | 41 | #endif |
e97c3e27 | 42 | |
1109a90c | 43 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
e97c3e27 BS |
44 | if (skb->nf_bridge && |
45 | skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING) | |
46 | return IP6_DEFRAG_CONNTRACK_BRIDGE_IN + zone; | |
47 | #endif | |
48 | if (hooknum == NF_INET_PRE_ROUTING) | |
49 | return IP6_DEFRAG_CONNTRACK_IN + zone; | |
50 | else | |
51 | return IP6_DEFRAG_CONNTRACK_OUT + zone; | |
52 | ||
53 | } | |
54 | ||
795aa6ef | 55 | static unsigned int ipv6_defrag(const struct nf_hook_ops *ops, |
e97c3e27 | 56 | struct sk_buff *skb, |
238e54c9 | 57 | const struct nf_hook_state *state) |
e97c3e27 BS |
58 | { |
59 | struct sk_buff *reasm; | |
60 | ||
07a93626 | 61 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
e97c3e27 BS |
62 | /* Previously seen (loopback)? */ |
63 | if (skb->nfct && !nf_ct_is_template((struct nf_conn *)skb->nfct)) | |
64 | return NF_ACCEPT; | |
2fc72c7b | 65 | #endif |
e97c3e27 | 66 | |
795aa6ef | 67 | reasm = nf_ct_frag6_gather(skb, nf_ct6_defrag_user(ops->hooknum, skb)); |
e97c3e27 BS |
68 | /* queued */ |
69 | if (reasm == NULL) | |
70 | return NF_STOLEN; | |
71 | ||
25985edc | 72 | /* error occurred or not fragmented */ |
e97c3e27 BS |
73 | if (reasm == skb) |
74 | return NF_ACCEPT; | |
75 | ||
6aafeef0 JP |
76 | nf_ct_frag6_consume_orig(reasm); |
77 | ||
78 | NF_HOOK_THRESH(NFPROTO_IPV6, ops->hooknum, reasm, | |
238e54c9 DM |
79 | state->in, state->out, |
80 | state->okfn, NF_IP6_PRI_CONNTRACK_DEFRAG + 1); | |
e97c3e27 BS |
81 | |
82 | return NF_STOLEN; | |
83 | } | |
84 | ||
85 | static struct nf_hook_ops ipv6_defrag_ops[] = { | |
86 | { | |
87 | .hook = ipv6_defrag, | |
88 | .owner = THIS_MODULE, | |
89 | .pf = NFPROTO_IPV6, | |
90 | .hooknum = NF_INET_PRE_ROUTING, | |
91 | .priority = NF_IP6_PRI_CONNTRACK_DEFRAG, | |
92 | }, | |
93 | { | |
94 | .hook = ipv6_defrag, | |
95 | .owner = THIS_MODULE, | |
96 | .pf = NFPROTO_IPV6, | |
97 | .hooknum = NF_INET_LOCAL_OUT, | |
98 | .priority = NF_IP6_PRI_CONNTRACK_DEFRAG, | |
99 | }, | |
100 | }; | |
101 | ||
102 | static int __init nf_defrag_init(void) | |
103 | { | |
104 | int ret = 0; | |
105 | ||
106 | ret = nf_ct_frag6_init(); | |
107 | if (ret < 0) { | |
108 | pr_err("nf_defrag_ipv6: can't initialize frag6.\n"); | |
109 | return ret; | |
110 | } | |
111 | ret = nf_register_hooks(ipv6_defrag_ops, ARRAY_SIZE(ipv6_defrag_ops)); | |
112 | if (ret < 0) { | |
113 | pr_err("nf_defrag_ipv6: can't register hooks\n"); | |
114 | goto cleanup_frag6; | |
115 | } | |
116 | return ret; | |
117 | ||
118 | cleanup_frag6: | |
119 | nf_ct_frag6_cleanup(); | |
120 | return ret; | |
121 | ||
122 | } | |
123 | ||
124 | static void __exit nf_defrag_fini(void) | |
125 | { | |
126 | nf_unregister_hooks(ipv6_defrag_ops, ARRAY_SIZE(ipv6_defrag_ops)); | |
127 | nf_ct_frag6_cleanup(); | |
128 | } | |
129 | ||
130 | void nf_defrag_ipv6_enable(void) | |
131 | { | |
132 | } | |
133 | EXPORT_SYMBOL_GPL(nf_defrag_ipv6_enable); | |
134 | ||
135 | module_init(nf_defrag_init); | |
136 | module_exit(nf_defrag_fini); | |
137 | ||
138 | MODULE_LICENSE("GPL"); |