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>
75 lines
2.0 KiB
C
75 lines
2.0 KiB
C
#ifndef __LINUX_IP6_NETFILTER_H
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#define __LINUX_IP6_NETFILTER_H
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/* IPv6-specific defines for netfilter.
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* (C)1998 Rusty Russell -- This code is GPL.
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* (C)1999 David Jeffery
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* this header was blatantly ripped from netfilter_ipv4.h
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* it's amazing what adding a bunch of 6s can do =8^)
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*/
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#include <linux/netfilter.h>
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/* only for userspace compatibility */
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#ifndef __KERNEL__
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/* IP Cache bits. */
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/* Src IP address. */
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#define NFC_IP6_SRC 0x0001
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/* Dest IP address. */
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#define NFC_IP6_DST 0x0002
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/* Input device. */
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#define NFC_IP6_IF_IN 0x0004
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/* Output device. */
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#define NFC_IP6_IF_OUT 0x0008
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/* TOS. */
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#define NFC_IP6_TOS 0x0010
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/* Protocol. */
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#define NFC_IP6_PROTO 0x0020
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/* IP options. */
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#define NFC_IP6_OPTIONS 0x0040
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/* Frag & flags. */
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#define NFC_IP6_FRAG 0x0080
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/* Per-protocol information: only matters if proto match. */
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/* TCP flags. */
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#define NFC_IP6_TCPFLAGS 0x0100
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/* Source port. */
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#define NFC_IP6_SRC_PT 0x0200
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/* Dest port. */
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#define NFC_IP6_DST_PT 0x0400
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/* Something else about the proto */
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#define NFC_IP6_PROTO_UNKNOWN 0x2000
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#endif /* ! __KERNEL__ */
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/* IP6 Hooks */
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/* After promisc drops, checksum checks. */
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#define NF_IP6_PRE_ROUTING 0
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/* If the packet is destined for this box. */
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#define NF_IP6_LOCAL_IN 1
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/* If the packet is destined for another interface. */
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#define NF_IP6_FORWARD 2
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/* Packets coming from a local process. */
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#define NF_IP6_LOCAL_OUT 3
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/* Packets about to hit the wire. */
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#define NF_IP6_POST_ROUTING 4
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#define NF_IP6_NUMHOOKS 5
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enum nf_ip6_hook_priorities {
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NF_IP6_PRI_FIRST = INT_MIN,
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NF_IP6_PRI_SELINUX_FIRST = -225,
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NF_IP6_PRI_CONNTRACK = -200,
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NF_IP6_PRI_BRIDGE_SABOTAGE_FORWARD = -175,
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NF_IP6_PRI_MANGLE = -150,
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NF_IP6_PRI_NAT_DST = -100,
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NF_IP6_PRI_BRIDGE_SABOTAGE_LOCAL_OUT = -50,
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NF_IP6_PRI_FILTER = 0,
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NF_IP6_PRI_NAT_SRC = 100,
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NF_IP6_PRI_SELINUX_LAST = 225,
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NF_IP6_PRI_LAST = INT_MAX,
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};
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#endif /*__LINUX_IP6_NETFILTER_H*/
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