projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | { | |
| 308ac914 | 36 | u16 zone_id = NF_CT_DEFAULT_ZONE_ID; |
| 07a93626 | 37 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
| deedb590 DB |
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 | } | |
| 2fc72c7b | 44 | #endif |
| 72b1e5e4 | 45 | if (nf_bridge_in_prerouting(skb)) |
| 308ac914 | 46 | return IP6_DEFRAG_CONNTRACK_BRIDGE_IN + zone_id; |
| 72b1e5e4 | 47 | |
| e97c3e27 | 48 | if (hooknum == NF_INET_PRE_ROUTING) |
| 308ac914 | 49 | return IP6_DEFRAG_CONNTRACK_IN + zone_id; |
| e97c3e27 | 50 | else |
| 308ac914 | 51 | return IP6_DEFRAG_CONNTRACK_OUT + zone_id; |
| e97c3e27 BS |
52 | } |
| 53 | ||
| 06198b34 | 54 | static unsigned int ipv6_defrag(void *priv, |
| e97c3e27 | 55 | struct sk_buff *skb, |
| 238e54c9 | 56 | const struct nf_hook_state *state) |
| e97c3e27 | 57 | { |
| daaa7d64 | 58 | int err; |
| e97c3e27 | 59 | |
| 07a93626 | 60 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
| e97c3e27 BS |
61 | /* Previously seen (loopback)? */ |
| 62 | if (skb->nfct && !nf_ct_is_template((struct nf_conn *)skb->nfct)) | |
| 63 | return NF_ACCEPT; | |
| 2fc72c7b | 64 | #endif |
| e97c3e27 | 65 | |
| daaa7d64 FW |
66 | err = nf_ct_frag6_gather(state->net, skb, |
| 67 | nf_ct6_defrag_user(state->hook, skb)); | |
| e97c3e27 | 68 | /* queued */ |
| daaa7d64 | 69 | if (err == -EINPROGRESS) |
| e97c3e27 BS |
70 | return NF_STOLEN; |
| 71 | ||
| daaa7d64 | 72 | return NF_ACCEPT; |
| e97c3e27 BS |
73 | } |
| 74 | ||
| 75 | static struct nf_hook_ops ipv6_defrag_ops[] = { | |
| 76 | { | |
| 77 | .hook = ipv6_defrag, | |
| e97c3e27 BS |
78 | .pf = NFPROTO_IPV6, |
| 79 | .hooknum = NF_INET_PRE_ROUTING, | |
| 80 | .priority = NF_IP6_PRI_CONNTRACK_DEFRAG, | |
| 81 | }, | |
| 82 | { | |
| 83 | .hook = ipv6_defrag, | |
| e97c3e27 BS |
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"); |