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 | { | |
| 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 BS |
56 | struct sk_buff *skb, |
| 57 | const struct net_device *in, | |
| 58 | const struct net_device *out, | |
| 59 | int (*okfn)(struct sk_buff *)) | |
| 60 | { | |
| 61 | struct sk_buff *reasm; | |
| 62 | ||
| 07a93626 | 63 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
| e97c3e27 BS |
64 | /* Previously seen (loopback)? */ |
| 65 | if (skb->nfct && !nf_ct_is_template((struct nf_conn *)skb->nfct)) | |
| 66 | return NF_ACCEPT; | |
| 2fc72c7b | 67 | #endif |
| e97c3e27 | 68 | |
| 795aa6ef | 69 | reasm = nf_ct_frag6_gather(skb, nf_ct6_defrag_user(ops->hooknum, skb)); |
| e97c3e27 BS |
70 | /* queued */ |
| 71 | if (reasm == NULL) | |
| 72 | return NF_STOLEN; | |
| 73 | ||
| 25985edc | 74 | /* error occurred or not fragmented */ |
| e97c3e27 BS |
75 | if (reasm == skb) |
| 76 | return NF_ACCEPT; | |
| 77 | ||
| 6aafeef0 JP |
78 | nf_ct_frag6_consume_orig(reasm); |
| 79 | ||
| 80 | NF_HOOK_THRESH(NFPROTO_IPV6, ops->hooknum, reasm, | |
| 81 | (struct net_device *) in, (struct net_device *) out, | |
| 82 | okfn, NF_IP6_PRI_CONNTRACK_DEFRAG + 1); | |
| e97c3e27 BS |
83 | |
| 84 | return NF_STOLEN; | |
| 85 | } | |
| 86 | ||
| 87 | static struct nf_hook_ops ipv6_defrag_ops[] = { | |
| 88 | { | |
| 89 | .hook = ipv6_defrag, | |
| 90 | .owner = THIS_MODULE, | |
| 91 | .pf = NFPROTO_IPV6, | |
| 92 | .hooknum = NF_INET_PRE_ROUTING, | |
| 93 | .priority = NF_IP6_PRI_CONNTRACK_DEFRAG, | |
| 94 | }, | |
| 95 | { | |
| 96 | .hook = ipv6_defrag, | |
| 97 | .owner = THIS_MODULE, | |
| 98 | .pf = NFPROTO_IPV6, | |
| 99 | .hooknum = NF_INET_LOCAL_OUT, | |
| 100 | .priority = NF_IP6_PRI_CONNTRACK_DEFRAG, | |
| 101 | }, | |
| 102 | }; | |
| 103 | ||
| 104 | static int __init nf_defrag_init(void) | |
| 105 | { | |
| 106 | int ret = 0; | |
| 107 | ||
| 108 | ret = nf_ct_frag6_init(); | |
| 109 | if (ret < 0) { | |
| 110 | pr_err("nf_defrag_ipv6: can't initialize frag6.\n"); | |
| 111 | return ret; | |
| 112 | } | |
| 113 | ret = nf_register_hooks(ipv6_defrag_ops, ARRAY_SIZE(ipv6_defrag_ops)); | |
| 114 | if (ret < 0) { | |
| 115 | pr_err("nf_defrag_ipv6: can't register hooks\n"); | |
| 116 | goto cleanup_frag6; | |
| 117 | } | |
| 118 | return ret; | |
| 119 | ||
| 120 | cleanup_frag6: | |
| 121 | nf_ct_frag6_cleanup(); | |
| 122 | return ret; | |
| 123 | ||
| 124 | } | |
| 125 | ||
| 126 | static void __exit nf_defrag_fini(void) | |
| 127 | { | |
| 128 | nf_unregister_hooks(ipv6_defrag_ops, ARRAY_SIZE(ipv6_defrag_ops)); | |
| 129 | nf_ct_frag6_cleanup(); | |
| 130 | } | |
| 131 | ||
| 132 | void nf_defrag_ipv6_enable(void) | |
| 133 | { | |
| 134 | } | |
| 135 | EXPORT_SYMBOL_GPL(nf_defrag_ipv6_enable); | |
| 136 | ||
| 137 | module_init(nf_defrag_init); | |
| 138 | module_exit(nf_defrag_fini); | |
| 139 | ||
| 140 | MODULE_LICENSE("GPL"); |