projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 73e4022f KK |
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/ip.h> | |
| 11 | #include <linux/netfilter.h> | |
| 12 | #include <linux/module.h> | |
| 13 | #include <linux/skbuff.h> | |
| 14 | #include <net/route.h> | |
| 15 | #include <net/ip.h> | |
| 16 | ||
| 17 | #include <linux/netfilter_ipv4.h> | |
| 18 | #include <net/netfilter/ipv4/nf_defrag_ipv4.h> | |
| 19 | ||
| 20 | /* Returns new sk_buff, or NULL */ | |
| 21 | static int nf_ct_ipv4_gather_frags(struct sk_buff *skb, u_int32_t user) | |
| 22 | { | |
| 23 | int err; | |
| 24 | ||
| 25 | skb_orphan(skb); | |
| 26 | ||
| 27 | local_bh_disable(); | |
| 28 | err = ip_defrag(skb, user); | |
| 29 | local_bh_enable(); | |
| 30 | ||
| 31 | if (!err) | |
| 32 | ip_send_check(ip_hdr(skb)); | |
| 33 | ||
| 34 | return err; | |
| 35 | } | |
| 36 | ||
| 37 | static unsigned int ipv4_conntrack_defrag(unsigned int hooknum, | |
| 38 | struct sk_buff *skb, | |
| 39 | const struct net_device *in, | |
| 40 | const struct net_device *out, | |
| 41 | int (*okfn)(struct sk_buff *)) | |
| 42 | { | |
| 43 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) | |
| 44 | /* Previously seen (loopback)? Ignore. Do this before | |
| 45 | fragment check. */ | |
| 46 | if (skb->nfct) | |
| 47 | return NF_ACCEPT; | |
| 48 | #endif | |
| 49 | ||
| 50 | /* Gather fragments. */ | |
| 51 | if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) { | |
| 52 | if (nf_ct_ipv4_gather_frags(skb, | |
| 53 | hooknum == NF_INET_PRE_ROUTING ? | |
| 54 | IP_DEFRAG_CONNTRACK_IN : | |
| 55 | IP_DEFRAG_CONNTRACK_OUT)) | |
| 56 | return NF_STOLEN; | |
| 57 | } | |
| 58 | return NF_ACCEPT; | |
| 59 | } | |
| 60 | ||
| 61 | static struct nf_hook_ops ipv4_defrag_ops[] = { | |
| 62 | { | |
| 63 | .hook = ipv4_conntrack_defrag, | |
| 64 | .owner = THIS_MODULE, | |
| 65 | .pf = PF_INET, | |
| 66 | .hooknum = NF_INET_PRE_ROUTING, | |
| 67 | .priority = NF_IP_PRI_CONNTRACK_DEFRAG, | |
| 68 | }, | |
| 69 | { | |
| 70 | .hook = ipv4_conntrack_defrag, | |
| 71 | .owner = THIS_MODULE, | |
| 72 | .pf = PF_INET, | |
| 73 | .hooknum = NF_INET_LOCAL_OUT, | |
| 74 | .priority = NF_IP_PRI_CONNTRACK_DEFRAG, | |
| 75 | }, | |
| 76 | }; | |
| 77 | ||
| 78 | static int __init nf_defrag_init(void) | |
| 79 | { | |
| 80 | return nf_register_hooks(ipv4_defrag_ops, ARRAY_SIZE(ipv4_defrag_ops)); | |
| 81 | } | |
| 82 | ||
| 83 | static void __exit nf_defrag_fini(void) | |
| 84 | { | |
| 85 | nf_unregister_hooks(ipv4_defrag_ops, ARRAY_SIZE(ipv4_defrag_ops)); | |
| 86 | } | |
| 87 | ||
| 88 | void nf_defrag_ipv4_enable(void) | |
| 89 | { | |
| 90 | } | |
| 91 | EXPORT_SYMBOL_GPL(nf_defrag_ipv4_enable); | |
| 92 | ||
| 93 | module_init(nf_defrag_init); | |
| 94 | module_exit(nf_defrag_fini); | |
| 95 | ||
| 96 | MODULE_LICENSE("GPL"); |