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  1. 23 Jul, 2010 5 commits
    • Changli Gao's avatar
      netfilter: nf_nat_core: merge the same lines · c36952e5
      Changli Gao authored 
      proto->unique_tuple() will be called finally, if the previous calls fail. This
patch checks the false condition of (range->flags &IP_NAT_RANGE_PROTO_RANDOM)
instead to avoid duplicate line of code: proto->unique_tuple().
Signed-off-by: default avatarChangli Gao <xiaosuo@gmail.com>
Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
      c36952e5
    • Eric Dumazet's avatar
      netfilter: add xt_cpu match · e8648a1f
      Eric Dumazet authored 
      In some situations a CPU match permits a better spreading of
connections, or select targets only for a given cpu.

With Remote Packet Steering or multiqueue NIC and appropriate IRQ
affinities, we can distribute trafic on available cpus, per session.
(all RX packets for a given flow is handled by a given cpu)

Some legacy applications being not SMP friendly, one way to scale a
server is to run multiple copies of them.

Instead of randomly choosing an instance, we can use the cpu number as a
key so that softirq handler for a whole instance is running on a single
cpu, maximizing cache effects in TCP/UDP stacks.

Using NAT for example, a four ways machine might run four copies of
server application, using a separate listening port for each instance,
but still presenting an unique external port :

iptables -t nat -A PREROUTING -p tcp --dport 80 -m cpu --cpu 0 \
        -j REDIRECT --to-port 8080

iptables -t nat -A PREROUTING -p tcp --dport 80 -m cpu --cpu 1 \
        -j REDIRECT --to-port 8081

iptables -t nat -A PREROUTING -p tcp --dport 80 -m cpu --cpu 2 \
        -j REDIRECT --to-port 8082

iptables -t nat -A PREROUTING -p tcp --dport 80 -m cpu --cpu 3 \
        -j REDIRECT --to-port 8083
Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
      e8648a1f
    • Hannes Eder's avatar
      IPVS: make FTP work with full NAT support · 7f1c4075
      Hannes Eder authored 
      Use nf_conntrack/nf_nat code to do the packet mangling and the TCP
sequence adjusting.  The function 'ip_vs_skb_replace' is now dead
code, so it is removed.

To SNAT FTP, use something like:

% iptables -t nat -A POSTROUTING -m ipvs --vaddr 192.168.100.30/32 \
    --vport 21 -j SNAT --to-source 192.168.10.10
and for the data connections in passive mode:

% iptables -t nat -A POSTROUTING -m ipvs --vaddr 192.168.100.30/32 \
    --vportctl 21 -j SNAT --to-source 192.168.10.10
using '-m state --state RELATED' would also works.

Make sure the kernel modules ip_vs_ftp, nf_conntrack_ftp, and
nf_nat_ftp are loaded.

[ up-port and minor fixes by Simon Horman <horms@verge.net.au> ]
Signed-off-by: default avatarHannes Eder <heder@google.com>
Signed-off-by: default avatarSimon Horman <horms@verge.net.au>
Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
      7f1c4075
    • Hannes Eder's avatar
      IPVS: make friends with nf_conntrack · 7b215ffc
      Hannes Eder authored 
      Update the nf_conntrack tuple in reply direction, as we will see
traffic from the real server (RIP) to the client (CIP).  Once this is
done we can use netfilters SNAT in POSTROUTING, especially with
xt_ipvs, to do source NAT, e.g.:

% iptables -t nat -A POSTROUTING -m ipvs --vaddr 192.168.100.30/32 --vport 80 \
		  -j SNAT --to-source 192.168.10.10

[ minor fixes by Simon Horman <horms@verge.net.au> ]
Signed-off-by: default avatarHannes Eder <heder@google.com>
Signed-off-by: default avatarSimon Horman <horms@verge.net.au>
Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
      7b215ffc
    • Hannes Eder's avatar
      netfilter: xt_ipvs (netfilter matcher for IPVS) · 9c3e1c39
      Hannes Eder authored 
      This implements the kernel-space side of the netfilter matcher xt_ipvs.

[ minor fixes by Simon Horman <horms@verge.net.au> ]
Signed-off-by: default avatarHannes Eder <heder@google.com>
Signed-off-by: default avatarSimon Horman <horms@verge.net.au>
[ Patrick: added xt_ipvs.h to Kbuild ]
Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
      9c3e1c39
  3. 16 Jul, 2010 1 commit
  5. 15 Jul, 2010 3 commits
  7. 09 Jul, 2010 2 commits
  9. 05 Jul, 2010 4 commits
  11. 04 Jul, 2010 9 commits
  13. 03 Jul, 2010 1 commit
  15. 02 Jul, 2010 12 commits
  17. 30 Jun, 2010 3 commits
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