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kaf24@firebug.cl.cam.ac.uk
4c315184c0
and optionally running in user-space. Signed-off-by: Mike Wray <mike.wray@hp.com>
88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
/*
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* Copyright (C) 2004 Mike Wray <mike.wray@hp.com>
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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 as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free software Foundation, Inc.,
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* 59 Temple Place, suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#ifndef __VNET_SKB_CONTEXT_H__
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#define __VNET_SKB_CONTEXT_H__
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#ifdef __KERNEL__
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <asm/atomic.h>
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#include <linux/types.h>
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//todo: fixme
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#define SKB_CONTEXT(_skb) ((SkbContext *)(&(_skb)->cb[0]))
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#else
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#include "sys_kernel.h"
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#include "spinlock.h"
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//todo: fixme
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#define SKB_CONTEXT(_skb) ((SkbContext *)NULL)
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#endif
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/** Structure used to record inbound processing path for skbs.
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* For example, the ETHERIP protocol handler can use this to
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* tell whether an inbound packet came through IPSEC ESP or not.
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*/
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typedef struct SkbContext {
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u32 vnet;
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u32 addr;
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int protocol;
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void *data;
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void (*free_fn)(struct SkbContext *);
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atomic_t refcount;
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struct SkbContext *next;
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} SkbContext;
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/** Decrement the reference count, freeing if zero.
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*
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* @param context context (may be null)
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*/
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static inline void SkbContext_decref(SkbContext *context){
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extern void SkbContext_free(SkbContext *context);
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if(!context) return;
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if(atomic_dec_and_test(&context->refcount)){
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SkbContext_free(context);
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}
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}
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/** Increment the reference count.
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*
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* @param context context (may be null)
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*/
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static inline void SkbContext_incref(SkbContext *context){
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if(!context) return;
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atomic_inc(&context->refcount);
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}
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extern SkbContext *SkbContext_create(u32 vnet, u32 addr, int protocol, void *data,
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void (*free_fn)(SkbContext *));
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extern int SkbContext_push(SkbContext **val, u32 vnet, u32 addr, int protocol,
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void *data, void (*free_fn)(SkbContext *));
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struct sk_buff;
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extern int skb_push_context(struct sk_buff *skb, u32 vnet, u32 addr, int protocol,
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void *data, void (*free_fn)(SkbContext *));
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#endif /* !__VNET_SKB_CONTEXT_H__ */
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