Hi, as a firewall admin I would like to see which rules allow the connections through my firewall. A relationship between conntrack and firewall rules would be nice. The next five patches bring this feature to the Linux Netfilter. First a small example. Consider this iptables rules: -A INPUT -m state --state ESTABLISHED,RELATED -j APPROVE --rule-id 1 -A OUTPUT -m state --state NEW,ESTABLISHED,RELATED -j APPROVE --rule-id 2 -A INPUT -p tcp --dport 22 -m state --state NEW -j APPROVE --rule-id 3 -A INPUT -p icmp -m state --state NEW -j APPROVE --rule-id 4 The APPROVE target is the same as ACCEPT but it stores also a rule id into the connection tracking entry. "conntrack -L" shows us this two entries: tcp 6 431999 ESTABLISHED src=192.168.1.1 dst=192.168.1.2 sport=51444 \ dport=22 src=192.168.1.2 dst=192.168.1.1 sport=22 dport=51444 [ASSURED] \ mark=0 established=1 related=0 new=3 reply=2 use=1 icmp 1 28 src=192.168.1.2 dst=149.20.20.133 type=8 code=0 id=63239 \ src=149.20.20.133 dst=192.168.1.2 type=0 code=0 id=63239 mark=0 \ established=2 related=0 new=2 reply=1 use=1 1. We observe a SSH connection from 192.168.1.1 to 192.168.1.2, it was allowed by rule 1, 3 and 2. (0 indicates that no rule was involved) 2. An ICMP ping from 192.168.1.2 to 149.20.20.133 which was allowed by the rules 1 and 2. The ruleid conntrack extension adds four u_int16_t values. Thus we can have up to 2^16 rules, I think this is enough and is not much overhead. Alternatively we a pointer to a string could also be useful. Maybe in conjunction with xt_comment... What do you think? Any feedback is welcome! //richard -- Richard Weinberger (3): netfilter: add ruleid extension netfilter: add APPROVE target netfilter: implement ctnetlink_dump_ruleid() include/linux/netfilter/nfnetlink_conntrack.h | 4 + include/linux/netfilter/xt_APPROVE.h | 8 +++ include/net/netfilter/nf_conntrack_extend.h | 2 + include/net/netfilter/nf_conntrack_ruleid.h | 25 +++++++ net/netfilter/Kconfig | 12 ++++ net/netfilter/Makefile | 3 +- net/netfilter/nf_conntrack_core.c | 6 ++ net/netfilter/nf_conntrack_netlink.c | 23 +++++++- net/netfilter/nf_conntrack_ruleid.c | 44 +++++++++++++ net/netfilter/xt_APPROVE.c | 85 +++++++++++++++++++++++++ 10 files changed, 210 insertions(+), 2 deletions(-) create mode 100644 include/linux/netfilter/xt_APPROVE.h create mode 100644 include/net/netfilter/nf_conntrack_ruleid.h create mode 100644 net/netfilter/nf_conntrack_ruleid.c create mode 100644 net/netfilter/xt_APPROVE.c -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
