123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136 |
- /* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
- #include <linux/types.h>
- #include <linux/ipv6.h>
- #include <linux/in6.h>
- #include <linux/netfilter.h>
- #include <linux/module.h>
- #include <linux/skbuff.h>
- #include <linux/icmp.h>
- #include <linux/sysctl.h>
- #include <net/ipv6.h>
- #include <net/inet_frag.h>
- #include <linux/netfilter_ipv6.h>
- #include <linux/netfilter_bridge.h>
- #if IS_ENABLED(CONFIG_NF_CONNTRACK)
- #include <net/netfilter/nf_conntrack.h>
- #include <net/netfilter/nf_conntrack_helper.h>
- #include <net/netfilter/nf_conntrack_l4proto.h>
- #include <net/netfilter/nf_conntrack_l3proto.h>
- #include <net/netfilter/nf_conntrack_core.h>
- #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
- #endif
- #include <net/netfilter/nf_conntrack_zones.h>
- #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
- static enum ip6_defrag_users nf_ct6_defrag_user(unsigned int hooknum,
- struct sk_buff *skb)
- {
- u16 zone_id = NF_CT_DEFAULT_ZONE_ID;
- #if IS_ENABLED(CONFIG_NF_CONNTRACK)
- if (skb->nfct) {
- enum ip_conntrack_info ctinfo;
- const struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
- zone_id = nf_ct_zone_id(nf_ct_zone(ct), CTINFO2DIR(ctinfo));
- }
- #endif
- if (nf_bridge_in_prerouting(skb))
- return IP6_DEFRAG_CONNTRACK_BRIDGE_IN + zone_id;
- if (hooknum == NF_INET_PRE_ROUTING)
- return IP6_DEFRAG_CONNTRACK_IN + zone_id;
- else
- return IP6_DEFRAG_CONNTRACK_OUT + zone_id;
- }
- static unsigned int ipv6_defrag(void *priv,
- struct sk_buff *skb,
- const struct nf_hook_state *state)
- {
- struct sk_buff *reasm;
- #if IS_ENABLED(CONFIG_NF_CONNTRACK)
- /* Previously seen (loopback)? */
- if (skb->nfct && !nf_ct_is_template((struct nf_conn *)skb->nfct))
- return NF_ACCEPT;
- #endif
- reasm = nf_ct_frag6_gather(state->net, skb,
- nf_ct6_defrag_user(state->hook, skb));
- /* queued */
- if (reasm == NULL)
- return NF_STOLEN;
- /* error occurred or not fragmented */
- if (reasm == skb)
- return NF_ACCEPT;
- nf_ct_frag6_consume_orig(reasm);
- NF_HOOK_THRESH(NFPROTO_IPV6, state->hook, state->net, state->sk, reasm,
- state->in, state->out,
- state->okfn, NF_IP6_PRI_CONNTRACK_DEFRAG + 1);
- return NF_STOLEN;
- }
- static struct nf_hook_ops ipv6_defrag_ops[] = {
- {
- .hook = ipv6_defrag,
- .pf = NFPROTO_IPV6,
- .hooknum = NF_INET_PRE_ROUTING,
- .priority = NF_IP6_PRI_CONNTRACK_DEFRAG,
- },
- {
- .hook = ipv6_defrag,
- .pf = NFPROTO_IPV6,
- .hooknum = NF_INET_LOCAL_OUT,
- .priority = NF_IP6_PRI_CONNTRACK_DEFRAG,
- },
- };
- static int __init nf_defrag_init(void)
- {
- int ret = 0;
- ret = nf_ct_frag6_init();
- if (ret < 0) {
- pr_err("nf_defrag_ipv6: can't initialize frag6.\n");
- return ret;
- }
- ret = nf_register_hooks(ipv6_defrag_ops, ARRAY_SIZE(ipv6_defrag_ops));
- if (ret < 0) {
- pr_err("nf_defrag_ipv6: can't register hooks\n");
- goto cleanup_frag6;
- }
- return ret;
- cleanup_frag6:
- nf_ct_frag6_cleanup();
- return ret;
- }
- static void __exit nf_defrag_fini(void)
- {
- nf_unregister_hooks(ipv6_defrag_ops, ARRAY_SIZE(ipv6_defrag_ops));
- nf_ct_frag6_cleanup();
- }
- void nf_defrag_ipv6_enable(void)
- {
- }
- EXPORT_SYMBOL_GPL(nf_defrag_ipv6_enable);
- module_init(nf_defrag_init);
- module_exit(nf_defrag_fini);
- MODULE_LICENSE("GPL");
|