a5fedd43d5
skb_gso_segment is expensive, so it would be nice if we could avoid it in the future. However, userspace needs to be prepared to receive larger-than-mtu-packets (which will also have incorrect l3/l4 checksums), so we cannot simply remove it. The plan is to add a per-queue feature flag that userspace can set when binding the queue. The problem is that in nf_queue, we only have a queue number, not the queue context/configuration settings. This patch should have no impact other than the skb_gso_segment call now being in a function that has access to the queue config data. A new size attribute in nf_queue_entry is needed so nfnetlink_queue can duplicate the entry of the gso skb when segmenting the skb while also copying the route key. The follow up patch adds switch to disable skb_gso_segment when queue config says so. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
37 lines
979 B
C
37 lines
979 B
C
#ifndef _NF_QUEUE_H
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#define _NF_QUEUE_H
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/* Each queued (to userspace) skbuff has one of these. */
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struct nf_queue_entry {
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struct list_head list;
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struct sk_buff *skb;
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unsigned int id;
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struct nf_hook_ops *elem;
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u_int8_t pf;
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u16 size; /* sizeof(entry) + saved route keys */
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unsigned int hook;
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struct net_device *indev;
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struct net_device *outdev;
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int (*okfn)(struct sk_buff *);
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/* extra space to store route keys */
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};
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#define nf_queue_entry_reroute(x) ((void *)x + sizeof(struct nf_queue_entry))
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/* Packet queuing */
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struct nf_queue_handler {
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int (*outfn)(struct nf_queue_entry *entry,
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unsigned int queuenum);
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};
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void nf_register_queue_handler(const struct nf_queue_handler *qh);
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void nf_unregister_queue_handler(void);
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extern void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict);
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bool nf_queue_entry_get_refs(struct nf_queue_entry *entry);
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void nf_queue_entry_release_refs(struct nf_queue_entry *entry);
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#endif /* _NF_QUEUE_H */
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