| 1 | /* |
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| 2 | * Copyright (C) 2004 Mike Wray <mike.wray@hp.com> |
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| 3 | * |
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| 4 | * This program is free software; you can redistribute it and/or modify |
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| 5 | * it under the terms of the GNU General Public License as published by the |
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| 6 | * Free Software Foundation; either version 2 of the License, or (at your |
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| 7 | * option) any later version. |
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| 8 | * |
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| 9 | * This program is distributed in the hope that it will be useful, but |
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| 10 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
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| 11 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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| 12 | * for more details. |
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| 13 | * |
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| 14 | * You should have received a copy of the GNU General Public License along |
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| 15 | * with this program; if not, write to the Free software Foundation, Inc., |
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| 16 | * 59 Temple Place, suite 330, Boston, MA 02111-1307 USA |
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| 17 | * |
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| 18 | */ |
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| 19 | |
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| 20 | #ifndef __VNET_SKB_CONTEXT_H__ |
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| 21 | #define __VNET_SKB_CONTEXT_H__ |
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| 22 | |
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| 23 | #ifdef __KERNEL__ |
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| 24 | #include <linux/config.h> |
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| 25 | #include <linux/kernel.h> |
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| 26 | #include <asm/atomic.h> |
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| 27 | #include <linux/types.h> |
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| 28 | |
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| 29 | //todo: fixme |
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| 30 | #define SKB_CONTEXT(_skb) ((SkbContext *)(&(_skb)->cb[0])) |
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| 31 | |
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| 32 | #else |
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| 33 | |
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| 34 | #include "sys_kernel.h" |
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| 35 | #include "spinlock.h" |
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| 36 | |
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| 37 | //todo: fixme |
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| 38 | #define SKB_CONTEXT(_skb) ((SkbContext *)NULL) |
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| 39 | |
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| 40 | #endif |
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| 41 | |
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| 42 | /** Structure used to record inbound processing path for skbs. |
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| 43 | * For example, the ETHERIP protocol handler can use this to |
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| 44 | * tell whether an inbound packet came through IPSEC ESP or not. |
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| 45 | */ |
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| 46 | typedef struct SkbContext { |
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| 47 | u32 vnet; |
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| 48 | u32 addr; |
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| 49 | int protocol; |
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| 50 | void *data; |
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| 51 | void (*free_fn)(struct SkbContext *); |
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| 52 | atomic_t refcount; |
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| 53 | struct SkbContext *next; |
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| 54 | } SkbContext; |
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| 55 | |
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| 56 | /** Decrement the reference count, freeing if zero. |
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| 57 | * |
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| 58 | * @param context context (may be null) |
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| 59 | */ |
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| 60 | static inline void SkbContext_decref(SkbContext *context){ |
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| 61 | extern void SkbContext_free(SkbContext *context); |
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| 62 | if(!context) return; |
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| 63 | if(atomic_dec_and_test(&context->refcount)){ |
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| 64 | SkbContext_free(context); |
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| 65 | } |
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| 66 | } |
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| 67 | |
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| 68 | /** Increment the reference count. |
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| 69 | * |
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| 70 | * @param context context (may be null) |
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| 71 | */ |
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| 72 | static inline void SkbContext_incref(SkbContext *context){ |
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| 73 | if(!context) return; |
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| 74 | atomic_inc(&context->refcount); |
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| 75 | } |
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| 76 | |
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| 77 | extern SkbContext *SkbContext_create(u32 vnet, u32 addr, int protocol, void *data, |
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| 78 | void (*free_fn)(SkbContext *)); |
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| 79 | |
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| 80 | extern int SkbContext_push(SkbContext **val, u32 vnet, u32 addr, int protocol, |
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| 81 | void *data, void (*free_fn)(SkbContext *)); |
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| 82 | |
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| 83 | struct sk_buff; |
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| 84 | extern int skb_push_context(struct sk_buff *skb, u32 vnet, u32 addr, int protocol, |
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| 85 | void *data, void (*free_fn)(SkbContext *)); |
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| 86 | |
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| 87 | #endif /* !__VNET_SKB_CONTEXT_H__ */ |
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