diff options
author | Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp> | 2005-11-09 16:38:16 -0800 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2005-11-09 16:38:16 -0800 |
commit | 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 (patch) | |
tree | c964a62bdd766eca436c30f51a9e33e2b798b0a6 /include/net/netfilter/nf_conntrack_compat.h | |
parent | 6730c3c14421b7c924d06e31bb66e0adad225547 (diff) | |
download | linux-9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1.tar.gz |
[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/net/netfilter/nf_conntrack_compat.h')
-rw-r--r-- | include/net/netfilter/nf_conntrack_compat.h | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/include/net/netfilter/nf_conntrack_compat.h b/include/net/netfilter/nf_conntrack_compat.h new file mode 100644 index 00000000000000..3cac19fb36488c --- /dev/null +++ b/include/net/netfilter/nf_conntrack_compat.h @@ -0,0 +1,108 @@ +#ifndef _NF_CONNTRACK_COMPAT_H +#define _NF_CONNTRACK_COMPAT_H + +#ifdef __KERNEL__ + +#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE) + +#include <linux/netfilter_ipv4/ip_conntrack.h> + +#ifdef CONFIG_IP_NF_CONNTRACK_MARK +static inline u_int32_t *nf_ct_get_mark(const struct sk_buff *skb, + u_int32_t *ctinfo) +{ + struct ip_conntrack *ct = ip_conntrack_get(skb, ctinfo); + + if (ct) + return &ct->mark; + else + return NULL; +} +#endif /* CONFIG_IP_NF_CONNTRACK_MARK */ + +#ifdef CONFIG_IP_NF_CT_ACCT +static inline struct ip_conntrack_counter * +nf_ct_get_counters(const struct sk_buff *skb) +{ + enum ip_conntrack_info ctinfo; + struct ip_conntrack *ct = ip_conntrack_get(skb, &ctinfo); + + if (ct) + return ct->counters; + else + return NULL; +} +#endif /* CONFIG_IP_NF_CT_ACCT */ + +static inline int nf_ct_is_untracked(const struct sk_buff *skb) +{ + return (skb->nfct == &ip_conntrack_untracked.ct_general); +} + +static inline void nf_ct_untrack(struct sk_buff *skb) +{ + skb->nfct = &ip_conntrack_untracked.ct_general; +} + +static inline int nf_ct_get_ctinfo(const struct sk_buff *skb, + enum ip_conntrack_info *ctinfo) +{ + struct ip_conntrack *ct = ip_conntrack_get(skb, ctinfo); + return (ct != NULL); +} + +#else /* CONFIG_IP_NF_CONNTRACK */ + +#include <net/netfilter/ipv4/nf_conntrack_ipv4.h> +#include <net/netfilter/nf_conntrack.h> + +#ifdef CONFIG_NF_CONNTRACK_MARK + +static inline u_int32_t *nf_ct_get_mark(const struct sk_buff *skb, + u_int32_t *ctinfo) +{ + struct nf_conn *ct = nf_ct_get(skb, ctinfo); + + if (ct) + return &ct->mark; + else + return NULL; +} +#endif /* CONFIG_NF_CONNTRACK_MARK */ + +#ifdef CONFIG_NF_CT_ACCT +static inline struct ip_conntrack_counter * +nf_ct_get_counters(const struct sk_buff *skb) +{ + enum ip_conntrack_info ctinfo; + struct nf_conn *ct = nf_ct_get(skb, &ctinfo); + + if (ct) + return ct->counters; + else + return NULL; +} +#endif /* CONFIG_NF_CT_ACCT */ + +static inline int nf_ct_is_untracked(const struct sk_buff *skb) +{ + return (skb->nfct == &nf_conntrack_untracked.ct_general); +} + +static inline void nf_ct_untrack(struct sk_buff *skb) +{ + skb->nfct = &nf_conntrack_untracked.ct_general; +} + +static inline int nf_ct_get_ctinfo(const struct sk_buff *skb, + enum ip_conntrack_info *ctinfo) +{ + struct nf_conn *ct = nf_ct_get(skb, ctinfo); + return (ct != NULL); +} + +#endif /* CONFIG_IP_NF_CONNTRACK */ + +#endif /* __KERNEL__ */ + +#endif /* _NF_CONNTRACK_COMPAT_H */ |