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>
78 lines
1.9 KiB
C
78 lines
1.9 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_ipv6/ip6_tables.h>
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#include <linux/netfilter_ipv6/ip6t_MARK.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
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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 ip6t_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 IP6T_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 ip6t_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 != IP6T_ALIGN(sizeof(struct ip6t_mark_target_info))) {
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printk(KERN_WARNING "MARK: targinfosize %u != %Zu\n",
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targinfosize,
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IP6T_ALIGN(sizeof(struct ip6t_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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return 1;
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}
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static struct ip6t_target ip6t_mark_reg
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= { { NULL, NULL }, "MARK", target, checkentry, NULL, THIS_MODULE };
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static int __init init(void)
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{
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printk(KERN_DEBUG "registering ipv6 mark target\n");
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if (ip6t_register_target(&ip6t_mark_reg))
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return -EINVAL;
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return 0;
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}
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static void __exit fini(void)
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{
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ip6t_unregister_target(&ip6t_mark_reg);
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}
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module_init(init);
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module_exit(fini);
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