diff options
| author | Jan Engelhardt <jengelh@computergmbh.de> | 2008-01-31 03:58:24 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-01-31 19:27:31 -0800 |
| commit | b41649989c9640e54e47001994b7ecb927ea1822 (patch) | |
| tree | 4c733dd12a1d8f95ac05c431fb64a1eb7cd7e59e /net | |
| parent | 41d0cdedd5d0a067069a1559315aa9bfdf00794a (diff) | |
[NETFILTER]: xt_conntrack: add port and direction matching
Extend the xt_conntrack match revision 1 by port matching (all four
{orig,repl}{src,dst}) and by packet direction matching.
Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netfilter/xt_conntrack.c | 50 |
1 files changed, 45 insertions, 5 deletions
diff --git a/net/netfilter/xt_conntrack.c b/net/netfilter/xt_conntrack.c index e92190eafcc..85330856a29 100644 --- a/net/netfilter/xt_conntrack.c +++ b/net/netfilter/xt_conntrack.c @@ -4,7 +4,6 @@ * * (C) 2001 Marc Boucher (marc@mbsi.ca). * Copyright © CC Computer Consultants GmbH, 2007 - 2008 - * Jan Engelhardt <jengelh@computergmbh.de> * * 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 @@ -20,6 +19,7 @@ MODULE_LICENSE("GPL"); MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>"); +MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); MODULE_DESCRIPTION("Xtables: connection tracking state match"); MODULE_ALIAS("ipt_conntrack"); MODULE_ALIAS("ip6t_conntrack"); @@ -166,6 +166,44 @@ conntrack_mt_repldst(const struct nf_conn *ct, &info->repldst_addr, &info->repldst_mask, family); } +static inline bool +ct_proto_port_check(const struct xt_conntrack_mtinfo1 *info, + const struct nf_conn *ct) +{ + const struct nf_conntrack_tuple *tuple; + + tuple = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple; + if ((info->match_flags & XT_CONNTRACK_PROTO) && + (tuple->dst.protonum == info->l4proto) ^ + !(info->invert_flags & XT_CONNTRACK_PROTO)) + return false; + + /* Shortcut to match all recognized protocols by using ->src.all. */ + if ((info->match_flags & XT_CONNTRACK_ORIGSRC_PORT) && + (tuple->src.u.all == info->origsrc_port) ^ + !(info->invert_flags & XT_CONNTRACK_ORIGSRC_PORT)) + return false; + + if ((info->match_flags & XT_CONNTRACK_ORIGDST_PORT) && + (tuple->dst.u.all == info->origdst_port) ^ + !(info->invert_flags & XT_CONNTRACK_ORIGDST_PORT)) + return false; + + tuple = &ct->tuplehash[IP_CT_DIR_REPLY].tuple; + + if ((info->match_flags & XT_CONNTRACK_REPLSRC_PORT) && + (tuple->src.u.all == info->replsrc_port) ^ + !(info->invert_flags & XT_CONNTRACK_REPLSRC_PORT)) + return false; + + if ((info->match_flags & XT_CONNTRACK_REPLDST_PORT) && + (tuple->dst.u.all == info->repldst_port) ^ + !(info->invert_flags & XT_CONNTRACK_REPLDST_PORT)) + return false; + + return true; +} + static bool conntrack_mt(const struct sk_buff *skb, const struct net_device *in, const struct net_device *out, const struct xt_match *match, @@ -200,10 +238,9 @@ conntrack_mt(const struct sk_buff *skb, const struct net_device *in, if (ct == NULL) return info->match_flags & XT_CONNTRACK_STATE; - - if ((info->match_flags & XT_CONNTRACK_PROTO) && - ((ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum == - info->l4proto) ^ !(info->invert_flags & XT_CONNTRACK_PROTO))) + if ((info->match_flags & XT_CONNTRACK_DIRECTION) && + (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) ^ + !!(info->invert_flags & XT_CONNTRACK_DIRECTION)) return false; if (info->match_flags & XT_CONNTRACK_ORIGSRC) @@ -226,6 +263,9 @@ conntrack_mt(const struct sk_buff *skb, const struct net_device *in, !(info->invert_flags & XT_CONNTRACK_REPLDST)) return false; + if (!ct_proto_port_check(info, ct)) + return false; + if ((info->match_flags & XT_CONNTRACK_STATUS) && (!!(info->status_mask & ct->status) ^ !(info->invert_flags & XT_CONNTRACK_STATUS))) |