linux-toradex.git/include/net/dst.h, branch v2.6.25-rc4

[DST]: shrinks sizeof(struct rtable) by 64 bytes on x86_64

2008-01-28T23:10:41+00:00

On x86_64, sizeof(struct rtable) is 0x148, which is rounded up to
0x180 bytes by SLAB allocator.

We can reduce this to exactly 0x140 bytes, without alignment overhead,
and store 12 struct rtable per PAGE instead of 10.

rate_tokens is currently defined as an "unsigned long", while its
content should not exceed 6*HZ. It can safely be converted to an
unsigned int.

Moving tclassid right after rate_tokens to fill the 4 bytes hole
permits to save 8 bytes on 'struct dst_entry', which finally permits
to save 8 bytes on 'struct rtable'

Signed-off-by: Eric Dumazet 
Signed-off-by: David S. Miller

[NETNS][DST]: Add the network namespace pointer in dst_ops

2008-01-28T23:02:47+00:00

The network namespace pointer can be stored into the dst_ops structure.
This is usefull when there are multiple instances of the dst_ops for a
protocol. When there are no several instances, this field will be never
used in the protocol. So there is no impact for the protocols which do
implement the network namespaces.

Signed-off-by: Daniel Lezcano 
Signed-off-by: David S. Miller

[NETNS][DST] dst: pass the dst_ops as parameter to the gc functions

2008-01-28T23:02:46+00:00

The garbage collection function receive the dst_ops structure as
parameter. This is useful for the next incoming patchset because it
will need the dst_ops (there will be several instances) and the
network namespace pointer (contained in the dst_ops).

The protocols which do not take care of the namespaces will not be
impacted by this change (expect for the function signature), they do
just ignore the parameter.

Signed-off-by: Daniel Lezcano 
Signed-off-by: David S. Miller

[NET]: Remove unused member of dst_entry

2008-01-28T23:00:47+00:00

The info placeholder member of dst_entry seems to be unused in the
network stack.

Signed-off-by: Rami Rosen 
Signed-off-by: David S. Miller

[IPSEC]: Add ICMP host relookup support

2008-01-28T22:57:23+00:00

RFC 4301 requires us to relookup ICMP traffic that does not match any
policies using the reverse of its payload.  This patch implements this
for ICMP traffic that originates from or terminates on localhost.

This is activated on outbound with the new policy flag XFRM_POLICY_ICMP,
and on inbound by the new state flag XFRM_STATE_ICMP.

On inbound the policy check is now performed by the ICMP protocol so
that it can repeat the policy check where necessary.

Signed-off-by: Herbert Xu 
Signed-off-by: David S. Miller

[IPSEC]: Make xfrm_lookup flags argument a bit-field

2008-01-28T22:57:21+00:00

This patch introduces an enum for bits in the flags argument of xfrm_lookup.
This is so that we can cram more information into it later.

Since all current users use just the values 0 and 1, XFRM_LOOKUP_WAIT has
been added with the value 1 << 0 to represent the current meaning of flags.

The test in __xfrm_lookup has been changed accordingly.

Signed-off-by: Herbert Xu 
Signed-off-by: David S. Miller

[IPSEC]: Merge most of the output path

2008-01-28T22:53:48+00:00

As part of the work on asynchrnous cryptographic operations, we need
to be able to resume from the spot where they occur.  As such, it
helps if we isolate them to one spot.

This patch moves most of the remaining family-specific processing into
the common output code.

Signed-off-by: Herbert Xu 
Signed-off-by: David S. Miller

[NET]: Eliminate duplicate copies of dst_discard

2008-01-28T22:53:37+00:00

We have a number of copies of dst_discard scattered around the place
which all do the same thing, namely free a packet on the input or
output paths.

This patch deletes all of them except dst_discard and points all the
users to it.

The only non-trivial bit is decnet where it returns an error.
However, conceptually this is identical to the blackhole functions
used in IPv4 and IPv6 which do not return errors.  So they should
either all return errors or all return zero.  For now I've stuck with
the majority and picked zero as the return value.

It doesn't really matter in practice since few if any driver would
react differently depending on a zero return value or NET_RX_DROP.

Signed-off-by: Herbert Xu 
Signed-off-by: David S. Miller

[IPV6]: Move nfheader_len into rt6_info

2008-01-28T22:53:37+00:00

The dst member nfheader_len is only used by IPv6.  It's also currently
creating a rather ugly alignment hole in struct dst.  Therefore this patch
moves it from there into struct rt6_info.

It also reorders the fields in rt6_info to minimize holes.

Signed-off-by: Herbert Xu 
Signed-off-by: David S. Miller

[NET]: Make helper to get dst entry and "use" it

2007-11-11T05:28:34+00:00

There are many places that get the dst entry, increase the
__use counter and set the "lastuse" time stamp.

Make a helper for this.

Signed-off-by: Pavel Emelyanov 
Signed-off-by: David S. Miller