![Yasuyuki Kozakai](/assets/img/avatar_default.png)
The existing connection tracking subsystem in netfilter can only handle ipv4. There were basically two choices present to add connection tracking support for ipv6. We could either duplicate all of the ipv4 connection tracking code into an ipv6 counterpart, or (the choice taken by these patches) we could design a generic layer that could handle both ipv4 and ipv6 and thus requiring only one sub-protocol (TCP, UDP, etc.) connection tracking helper module to be written. In fact nf_conntrack is capable of working with any layer 3 protocol. The existing ipv4 specific conntrack code could also not deal with the pecularities of doing connection tracking on ipv6, which is also cured here. For example, these issues include: 1) ICMPv6 handling, which is used for neighbour discovery in ipv6 thus some messages such as these should not participate in connection tracking since effectively they are like ARP messages 2) fragmentation must be handled differently in ipv6, because the simplistic "defrag, connection track and NAT, refrag" (which the existing ipv4 connection tracking does) approach simply isn't feasible in ipv6 3) ipv6 extension header parsing must occur at the correct spots before and after connection tracking decisions, and there were no provisions for this in the existing connection tracking design 4) ipv6 has no need for stateful NAT The ipv4 specific conntrack layer is kept around, until all of the ipv4 specific conntrack helpers are ported over to nf_conntrack and it is feature complete. Once that occurs, the old conntrack stuff will get placed into the feature-removal-schedule and we will fully kill it off 6 months later. Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp> Signed-off-by: Harald Welte <laforge@netfilter.org> Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/* (C) 1999-2001 Paul `Rusty' Russell
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* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
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* - enable working with L3 protocol independent connection tracking.
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*
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* Derived from net/ipv4/netfilter/ip_conntrack_proto_generic.c
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*/
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/netfilter.h>
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#include <net/netfilter/nf_conntrack_protocol.h>
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unsigned long nf_ct_generic_timeout = 600*HZ;
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static int generic_pkt_to_tuple(const struct sk_buff *skb,
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unsigned int dataoff,
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struct nf_conntrack_tuple *tuple)
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{
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tuple->src.u.all = 0;
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tuple->dst.u.all = 0;
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return 1;
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}
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static int generic_invert_tuple(struct nf_conntrack_tuple *tuple,
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const struct nf_conntrack_tuple *orig)
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{
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tuple->src.u.all = 0;
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tuple->dst.u.all = 0;
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return 1;
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}
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/* Print out the per-protocol part of the tuple. */
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static int generic_print_tuple(struct seq_file *s,
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const struct nf_conntrack_tuple *tuple)
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{
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return 0;
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}
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/* Print out the private part of the conntrack. */
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static int generic_print_conntrack(struct seq_file *s,
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const struct nf_conn *state)
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{
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return 0;
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}
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/* Returns verdict for packet, or -1 for invalid. */
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static int packet(struct nf_conn *conntrack,
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const struct sk_buff *skb,
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unsigned int dataoff,
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enum ip_conntrack_info ctinfo,
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int pf,
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unsigned int hooknum)
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{
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nf_ct_refresh_acct(conntrack, ctinfo, skb, nf_ct_generic_timeout);
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return NF_ACCEPT;
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}
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/* Called when a new connection for this protocol found. */
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static int new(struct nf_conn *conntrack, const struct sk_buff *skb,
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unsigned int dataoff)
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{
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return 1;
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}
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struct nf_conntrack_protocol nf_conntrack_generic_protocol =
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{
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.l3proto = PF_UNSPEC,
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.proto = 0,
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.name = "unknown",
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.pkt_to_tuple = generic_pkt_to_tuple,
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.invert_tuple = generic_invert_tuple,
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.print_tuple = generic_print_tuple,
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.print_conntrack = generic_print_conntrack,
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.packet = packet,
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.new = new,
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};
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