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https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
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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>
172 lines
3.8 KiB
C
172 lines
3.8 KiB
C
/* This is a module which is used for setting the NFMARK field of an skb. */
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/* (C) 1999-2001 Marc Boucher <marc@mbsi.ca>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <net/checksum.h>
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#include <linux/netfilter_ipv4/ip_tables.h>
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#include <linux/netfilter_ipv4/ipt_MARK.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
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MODULE_DESCRIPTION("iptables MARK modification module");
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static unsigned int
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target_v0(struct sk_buff **pskb,
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const struct net_device *in,
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const struct net_device *out,
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unsigned int hooknum,
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const void *targinfo,
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void *userinfo)
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{
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const struct ipt_mark_target_info *markinfo = targinfo;
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if((*pskb)->nfmark != markinfo->mark)
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(*pskb)->nfmark = markinfo->mark;
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return IPT_CONTINUE;
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}
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static unsigned int
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target_v1(struct sk_buff **pskb,
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const struct net_device *in,
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const struct net_device *out,
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unsigned int hooknum,
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const void *targinfo,
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void *userinfo)
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{
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const struct ipt_mark_target_info_v1 *markinfo = targinfo;
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int mark = 0;
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switch (markinfo->mode) {
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case IPT_MARK_SET:
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mark = markinfo->mark;
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break;
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case IPT_MARK_AND:
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mark = (*pskb)->nfmark & markinfo->mark;
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break;
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case IPT_MARK_OR:
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mark = (*pskb)->nfmark | markinfo->mark;
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break;
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}
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if((*pskb)->nfmark != mark)
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(*pskb)->nfmark = mark;
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return IPT_CONTINUE;
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}
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static int
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checkentry_v0(const char *tablename,
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const struct ipt_entry *e,
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void *targinfo,
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unsigned int targinfosize,
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unsigned int hook_mask)
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{
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struct ipt_mark_target_info *markinfo = targinfo;
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if (targinfosize != IPT_ALIGN(sizeof(struct ipt_mark_target_info))) {
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printk(KERN_WARNING "MARK: targinfosize %u != %Zu\n",
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targinfosize,
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IPT_ALIGN(sizeof(struct ipt_mark_target_info)));
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return 0;
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}
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if (strcmp(tablename, "mangle") != 0) {
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printk(KERN_WARNING "MARK: can only be called from \"mangle\" table, not \"%s\"\n", tablename);
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return 0;
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}
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if (markinfo->mark > 0xffffffff) {
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printk(KERN_WARNING "MARK: Only supports 32bit wide mark\n");
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return 0;
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}
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return 1;
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}
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static int
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checkentry_v1(const char *tablename,
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const struct ipt_entry *e,
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void *targinfo,
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unsigned int targinfosize,
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unsigned int hook_mask)
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{
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struct ipt_mark_target_info_v1 *markinfo = targinfo;
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if (targinfosize != IPT_ALIGN(sizeof(struct ipt_mark_target_info_v1))){
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printk(KERN_WARNING "MARK: targinfosize %u != %Zu\n",
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targinfosize,
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IPT_ALIGN(sizeof(struct ipt_mark_target_info_v1)));
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return 0;
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}
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if (strcmp(tablename, "mangle") != 0) {
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printk(KERN_WARNING "MARK: can only be called from \"mangle\" table, not \"%s\"\n", tablename);
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return 0;
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}
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if (markinfo->mode != IPT_MARK_SET
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&& markinfo->mode != IPT_MARK_AND
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&& markinfo->mode != IPT_MARK_OR) {
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printk(KERN_WARNING "MARK: unknown mode %u\n",
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markinfo->mode);
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return 0;
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}
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if (markinfo->mark > 0xffffffff) {
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printk(KERN_WARNING "MARK: Only supports 32bit wide mark\n");
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return 0;
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}
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return 1;
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}
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static struct ipt_target ipt_mark_reg_v0 = {
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.name = "MARK",
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.target = target_v0,
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.checkentry = checkentry_v0,
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.me = THIS_MODULE,
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.revision = 0,
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};
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static struct ipt_target ipt_mark_reg_v1 = {
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.name = "MARK",
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.target = target_v1,
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.checkentry = checkentry_v1,
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.me = THIS_MODULE,
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.revision = 1,
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};
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static int __init init(void)
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{
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int err;
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err = ipt_register_target(&ipt_mark_reg_v0);
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if (!err) {
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err = ipt_register_target(&ipt_mark_reg_v1);
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if (err)
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ipt_unregister_target(&ipt_mark_reg_v0);
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}
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return err;
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}
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static void __exit fini(void)
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{
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ipt_unregister_target(&ipt_mark_reg_v0);
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ipt_unregister_target(&ipt_mark_reg_v1);
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}
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module_init(init);
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module_exit(fini);
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