diff options
| author | Harald Welte <laforge@netfilter.org> | 2005-08-09 19:32:58 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2005-08-29 15:31:49 -0700 |
| commit | 080774a243f56ce2195ace96fba3d18548ee48ce (patch) | |
| tree | 2065041cb2b85891ca45648122122796122c38dc /net/ipv4/netfilter/ip_conntrack_proto_tcp.c | |
| parent | 6f1cf16582160c4839f05007c978743911aa022b (diff) | |
[NETFILTER]: Add ctnetlink subsystem
Add ctnetlink subsystem for userspace-access to ip_conntrack table.
This allows reading and updating of existing entries, as well as
creating new ones (and new expect's) via nfnetlink.
Please note the 'strange' byte order: nfattr (tag+length) are in host
byte order, while the payload is always guaranteed to be in network
byte order. This allows a simple userspace process to encapsulate netlink
messages into arch-independent udp packets by just processing/swapping the
headers and not knowing anything about the actual payload.
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/netfilter/ip_conntrack_proto_tcp.c')
| -rw-r--r-- | net/ipv4/netfilter/ip_conntrack_proto_tcp.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/ip_conntrack_proto_tcp.c b/net/ipv4/netfilter/ip_conntrack_proto_tcp.c index a569ad1ee4d..c2bce22d403 100644 --- a/net/ipv4/netfilter/ip_conntrack_proto_tcp.c +++ b/net/ipv4/netfilter/ip_conntrack_proto_tcp.c @@ -336,6 +336,23 @@ static int tcp_print_conntrack(struct seq_file *s, return seq_printf(s, "%s ", tcp_conntrack_names[state]); } +#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \ + defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE) +static int tcp_to_nfattr(struct sk_buff *skb, struct nfattr *nfa, + const struct ip_conntrack *ct) +{ + read_lock_bh(&tcp_lock); + NFA_PUT(skb, CTA_PROTOINFO_TCP_STATE, sizeof(u_int8_t), + &ct->proto.tcp.state); + read_unlock_bh(&tcp_lock); + + return 0; + +nfattr_failure: + return -1; +} +#endif + static unsigned int get_conntrack_index(const struct tcphdr *tcph) { if (tcph->rst) return TCP_RST_SET; @@ -1100,4 +1117,10 @@ struct ip_conntrack_protocol ip_conntrack_protocol_tcp = .packet = tcp_packet, .new = tcp_new, .error = tcp_error, +#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \ + defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE) + .to_nfattr = tcp_to_nfattr, + .tuple_to_nfattr = ip_ct_port_tuple_to_nfattr, + .nfattr_to_tuple = ip_ct_port_nfattr_to_tuple, +#endif }; |