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authorYasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>2005-11-09 19:38:16 -0500
committerDavid S. Miller <davem@davemloft.net>2005-11-09 19:38:16 -0500
commit9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 (patch)
treec964a62bdd766eca436c30f51a9e33e2b798b0a6 /include/linux/skbuff.h
parent6730c3c14421b7c924d06e31bb66e0adad225547 (diff)
[NETFILTER]: Add nf_conntrack subsystem.
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>
Diffstat (limited to 'include/linux/skbuff.h')
-rw-r--r--include/linux/skbuff.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index fdfb8fe8c38c..83010231db99 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -274,6 +274,9 @@ struct sk_buff {
274#if defined(CONFIG_IP_VS) || defined(CONFIG_IP_VS_MODULE) 274#if defined(CONFIG_IP_VS) || defined(CONFIG_IP_VS_MODULE)
275 __u8 ipvs_property:1; 275 __u8 ipvs_property:1;
276#endif 276#endif
277#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
278 struct sk_buff *nfct_reasm;
279#endif
277#ifdef CONFIG_BRIDGE_NETFILTER 280#ifdef CONFIG_BRIDGE_NETFILTER
278 struct nf_bridge_info *nf_bridge; 281 struct nf_bridge_info *nf_bridge;
279#endif 282#endif
@@ -1313,10 +1316,26 @@ static inline void nf_conntrack_get(struct nf_conntrack *nfct)
1313 if (nfct) 1316 if (nfct)
1314 atomic_inc(&nfct->use); 1317 atomic_inc(&nfct->use);
1315} 1318}
1319#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1320static inline void nf_conntrack_get_reasm(struct sk_buff *skb)
1321{
1322 if (skb)
1323 atomic_inc(&skb->users);
1324}
1325static inline void nf_conntrack_put_reasm(struct sk_buff *skb)
1326{
1327 if (skb)
1328 kfree_skb(skb);
1329}
1330#endif
1316static inline void nf_reset(struct sk_buff *skb) 1331static inline void nf_reset(struct sk_buff *skb)
1317{ 1332{
1318 nf_conntrack_put(skb->nfct); 1333 nf_conntrack_put(skb->nfct);
1319 skb->nfct = NULL; 1334 skb->nfct = NULL;
1335#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1336 nf_conntrack_put_reasm(skb->nfct_reasm);
1337 skb->nfct_reasm = NULL;
1338#endif
1320} 1339}
1321 1340
1322#ifdef CONFIG_BRIDGE_NETFILTER 1341#ifdef CONFIG_BRIDGE_NETFILTER