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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>
67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
/*
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* ebt_mark
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*
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* Authors:
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* Bart De Schuymer <bdschuym@pandora.be>
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*
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* July, 2002
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*
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*/
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/* The mark target can be used in any chain,
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* I believe adding a mangle table just for marking is total overkill.
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* Marking a frame doesn't really change anything in the frame anyway.
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*/
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#include <linux/netfilter_bridge/ebtables.h>
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#include <linux/netfilter_bridge/ebt_mark_t.h>
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#include <linux/module.h>
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static int ebt_target_mark(struct sk_buff **pskb, unsigned int hooknr,
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const struct net_device *in, const struct net_device *out,
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const void *data, unsigned int datalen)
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{
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struct ebt_mark_t_info *info = (struct ebt_mark_t_info *)data;
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if ((*pskb)->nfmark != info->mark)
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(*pskb)->nfmark = info->mark;
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return info->target;
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}
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static int ebt_target_mark_check(const char *tablename, unsigned int hookmask,
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const struct ebt_entry *e, void *data, unsigned int datalen)
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{
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struct ebt_mark_t_info *info = (struct ebt_mark_t_info *)data;
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if (datalen != EBT_ALIGN(sizeof(struct ebt_mark_t_info)))
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return -EINVAL;
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if (BASE_CHAIN && info->target == EBT_RETURN)
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return -EINVAL;
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CLEAR_BASE_CHAIN_BIT;
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if (INVALID_TARGET)
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return -EINVAL;
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return 0;
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}
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static struct ebt_target mark_target =
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{
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.name = EBT_MARK_TARGET,
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.target = ebt_target_mark,
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.check = ebt_target_mark_check,
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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 ebt_register_target(&mark_target);
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}
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static void __exit fini(void)
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{
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ebt_unregister_target(&mark_target);
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}
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module_init(init);
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module_exit(fini);
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MODULE_LICENSE("GPL");
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