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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>
90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
/*
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* This is a module which is used for setting the skb->priority field
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* of an skb for qdisc classification.
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*/
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/* (C) 2001-2002 Patrick McHardy <kaber@trash.net>
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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_CLASSIFY.h>
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MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("iptables qdisc classification target module");
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static unsigned int
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target(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_classify_target_info *clinfo = targinfo;
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if((*pskb)->priority != clinfo->priority)
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(*pskb)->priority = clinfo->priority;
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return IPT_CONTINUE;
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}
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static int
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checkentry(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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if (targinfosize != IPT_ALIGN(sizeof(struct ipt_classify_target_info))){
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printk(KERN_ERR "CLASSIFY: invalid size (%u != %Zu).\n",
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targinfosize,
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IPT_ALIGN(sizeof(struct ipt_classify_target_info)));
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return 0;
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}
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if (hook_mask & ~((1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_FORWARD) |
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(1 << NF_IP_POST_ROUTING))) {
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printk(KERN_ERR "CLASSIFY: only valid in LOCAL_OUT, FORWARD "
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"and POST_ROUTING.\n");
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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_ERR "CLASSIFY: can only be called from "
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"\"mangle\" table, not \"%s\".\n",
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tablename);
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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_classify_reg = {
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.name = "CLASSIFY",
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.target = target,
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.checkentry = checkentry,
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.me = THIS_MODULE,
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};
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static int __init init(void)
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{
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return ipt_register_target(&ipt_classify_reg);
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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_classify_reg);
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}
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module_init(init);
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module_exit(fini);
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