mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-10-19 01:48:56 +00:00
6869c4d8e0
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>
90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
#ifndef __LINUX_IP_NETFILTER_H
|
|
#define __LINUX_IP_NETFILTER_H
|
|
|
|
/* IPv4-specific defines for netfilter.
|
|
* (C)1998 Rusty Russell -- This code is GPL.
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/netfilter.h>
|
|
|
|
/* only for userspace compatibility */
|
|
#ifndef __KERNEL__
|
|
/* IP Cache bits. */
|
|
/* Src IP address. */
|
|
#define NFC_IP_SRC 0x0001
|
|
/* Dest IP address. */
|
|
#define NFC_IP_DST 0x0002
|
|
/* Input device. */
|
|
#define NFC_IP_IF_IN 0x0004
|
|
/* Output device. */
|
|
#define NFC_IP_IF_OUT 0x0008
|
|
/* TOS. */
|
|
#define NFC_IP_TOS 0x0010
|
|
/* Protocol. */
|
|
#define NFC_IP_PROTO 0x0020
|
|
/* IP options. */
|
|
#define NFC_IP_OPTIONS 0x0040
|
|
/* Frag & flags. */
|
|
#define NFC_IP_FRAG 0x0080
|
|
|
|
/* Per-protocol information: only matters if proto match. */
|
|
/* TCP flags. */
|
|
#define NFC_IP_TCPFLAGS 0x0100
|
|
/* Source port. */
|
|
#define NFC_IP_SRC_PT 0x0200
|
|
/* Dest port. */
|
|
#define NFC_IP_DST_PT 0x0400
|
|
/* Something else about the proto */
|
|
#define NFC_IP_PROTO_UNKNOWN 0x2000
|
|
#endif /* ! __KERNEL__ */
|
|
|
|
/* IP Hooks */
|
|
/* After promisc drops, checksum checks. */
|
|
#define NF_IP_PRE_ROUTING 0
|
|
/* If the packet is destined for this box. */
|
|
#define NF_IP_LOCAL_IN 1
|
|
/* If the packet is destined for another interface. */
|
|
#define NF_IP_FORWARD 2
|
|
/* Packets coming from a local process. */
|
|
#define NF_IP_LOCAL_OUT 3
|
|
/* Packets about to hit the wire. */
|
|
#define NF_IP_POST_ROUTING 4
|
|
#define NF_IP_NUMHOOKS 5
|
|
|
|
enum nf_ip_hook_priorities {
|
|
NF_IP_PRI_FIRST = INT_MIN,
|
|
NF_IP_PRI_CONNTRACK_DEFRAG = -400,
|
|
NF_IP_PRI_RAW = -300,
|
|
NF_IP_PRI_SELINUX_FIRST = -225,
|
|
NF_IP_PRI_CONNTRACK = -200,
|
|
NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD = -175,
|
|
NF_IP_PRI_MANGLE = -150,
|
|
NF_IP_PRI_NAT_DST = -100,
|
|
NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT = -50,
|
|
NF_IP_PRI_FILTER = 0,
|
|
NF_IP_PRI_NAT_SRC = 100,
|
|
NF_IP_PRI_SELINUX_LAST = 225,
|
|
NF_IP_PRI_CONNTRACK_HELPER = INT_MAX - 2,
|
|
NF_IP_PRI_NAT_SEQ_ADJUST = INT_MAX - 1,
|
|
NF_IP_PRI_CONNTRACK_CONFIRM = INT_MAX,
|
|
NF_IP_PRI_LAST = INT_MAX,
|
|
};
|
|
|
|
/* Arguments for setsockopt SOL_IP: */
|
|
/* 2.0 firewalling went from 64 through 71 (and +256, +512, etc). */
|
|
/* 2.2 firewalling (+ masq) went from 64 through 76 */
|
|
/* 2.4 firewalling went 64 through 67. */
|
|
#define SO_ORIGINAL_DST 80
|
|
|
|
#ifdef __KERNEL__
|
|
extern int ip_route_me_harder(struct sk_buff **pskb);
|
|
|
|
/* Call this before modifying an existing IP packet: ensures it is
|
|
modifiable and linear to the point you care about (writable_len).
|
|
Returns true or false. */
|
|
extern int skb_ip_make_writable(struct sk_buff **pskb,
|
|
unsigned int writable_len);
|
|
#endif /*__KERNEL__*/
|
|
|
|
#endif /*__LINUX_IP_NETFILTER_H*/
|