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author | Harald Welte <laforge@netfilter.org> | 2005-08-09 19:24:19 -0700 |
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committer | David S. Miller <davem@sunset.davemloft.net> | 2005-08-29 15:31:04 -0700 |
commit | 6869c4d8e066e21623c812c448a05f1ed931c9c6 (patch) | |
tree | ce18efc459e121e3a0b1bf5f85615567cdb30f68 /include/linux/netfilter_ipv6.h | |
parent | bf3a46aa9b96f6eb3a49a568f72a2801c3e830c0 (diff) | |
download | linux-stable-6869c4d8e066e21623c812c448a05f1ed931c9c6.tar.gz linux-stable-6869c4d8e066e21623c812c448a05f1ed931c9c6.tar.bz2 linux-stable-6869c4d8e066e21623c812c448a05f1ed931c9c6.zip |
[NETFILTER]: reduce netfilter sk_buff enlargement
As discussed at netconf'05, we're trying to save every bit in sk_buff.
The patch below makes sk_buff 8 bytes smaller. I did some basic
testing on my notebook and it seems to work.
The only real in-tree user of nfcache was IPVS, who only needs a
single bit. Unfortunately I couldn't find some other free bit in
sk_buff to stuff that bit into, so I introduced a separate field for
them. Maybe the IPVS guys can resolve that to further save space.
Initially I wanted to shrink pkt_type to three bits (PACKET_HOST and
alike are only 6 values defined), but unfortunately the bluetooth code
overloads pkt_type :(
The conntrack-event-api (out-of-tree) uses nfcache, but Rusty just
came up with a way how to do it without any skb fields, so it's safe
to remove it.
- remove all never-implemented 'nfcache' code
- don't have ipvs code abuse 'nfcache' field. currently get's their own
compile-conditional skb->ipvs_property field. IPVS maintainers can
decide to move this bit elswhere, but nfcache needs to die.
- remove skb->nfcache field to save 4 bytes
- move skb->nfctinfo into three unused bits to save further 4 bytes
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/netfilter_ipv6.h')
-rw-r--r-- | include/linux/netfilter_ipv6.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/netfilter_ipv6.h b/include/linux/netfilter_ipv6.h index bee7a5ec7c66..20c069a5e4ac 100644 --- a/include/linux/netfilter_ipv6.h +++ b/include/linux/netfilter_ipv6.h @@ -10,6 +10,8 @@ #include <linux/netfilter.h> +/* only for userspace compatibility */ +#ifndef __KERNEL__ /* IP Cache bits. */ /* Src IP address. */ #define NFC_IP6_SRC 0x0001 @@ -38,6 +40,7 @@ #define NFC_IP6_DST_PT 0x0400 /* Something else about the proto */ #define NFC_IP6_PROTO_UNKNOWN 0x2000 +#endif /* ! __KERNEL__ */ /* IP6 Hooks */ |