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authorHerbert Xu <herbert@gondor.apana.org.au>2007-09-27 12:48:05 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-10 16:53:11 -0700
commitb4219952356baa162368f2f5dab6421a5dbc5e15 (patch)
tree4d99027b3453853c79a32793c4ebda76c6386169 /net/sched/Makefile
parent[PATCH] adm8211: Detect interface up/down in suspend/resume hooks correctly (diff)
downloadlinux-dev-b4219952356baa162368f2f5dab6421a5dbc5e15.tar.xz
linux-dev-b4219952356baa162368f2f5dab6421a5dbc5e15.zip
[PKT_SCHED]: Add stateless NAT
Stateless NAT is useful in controlled environments where restrictions are placed on through traffic such that we don't need connection tracking to correctly NAT protocol-specific data. In particular, this is of interest when the number of flows or the number of addresses being NATed is large, or if connection tracking information has to be replicated and where it is not practical to do so. Previously we had stateless NAT functionality which was integrated into the IPv4 routing subsystem. This was a great solution as long as the NAT worked on a subnet to subnet basis such that the number of NAT rules was relatively small. The reason is that for SNAT the routing based system had to perform a linear scan through the rules. If the number of rules is large then major renovations would have take place in the routing subsystem to make this practical. For the time being, the least intrusive way of achieving this is to use the u32 classifier written by Alexey Kuznetsov along with the actions infrastructure implemented by Jamal Hadi Salim. The following patch is an attempt at this problem by creating a new nat action that can be invoked from u32 hash tables which would allow large number of stateless NAT rules that can be used/updated in constant time. The actual NAT code is mostly based on the previous stateless NAT code written by Alexey. In future we might be able to utilise the protocol NAT code from netfilter to improve support for other protocols. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/Makefile')
-rw-r--r--net/sched/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/sched/Makefile b/net/sched/Makefile
index b67c36f65cf2..81ecbe8e7dce 100644
--- a/net/sched/Makefile
+++ b/net/sched/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_NET_ACT_POLICE) += act_police.o
obj-$(CONFIG_NET_ACT_GACT) += act_gact.o
obj-$(CONFIG_NET_ACT_MIRRED) += act_mirred.o
obj-$(CONFIG_NET_ACT_IPT) += act_ipt.o
+obj-$(CONFIG_NET_ACT_NAT) += act_nat.o
obj-$(CONFIG_NET_ACT_PEDIT) += act_pedit.o
obj-$(CONFIG_NET_ACT_SIMP) += act_simple.o
obj-$(CONFIG_NET_SCH_FIFO) += sch_fifo.o