1 | /* |
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2 | * Copyright (C) 2004, 2005 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 | #ifndef __VNET_TUNNEL_H__ |
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20 | #define __VNET_TUNNEL_H__ |
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21 | |
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22 | #ifdef __KERNEL__ |
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23 | #include <linux/types.h> |
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24 | #include <asm/atomic.h> |
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25 | |
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26 | #else |
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27 | |
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28 | //#include <linux/types.h> |
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29 | #include "sys_kernel.h" |
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30 | #include "spinlock.h" |
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31 | |
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32 | #endif |
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33 | |
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34 | #include <if_varp.h> |
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35 | |
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36 | struct sk_buff; |
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37 | struct Tunnel; |
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38 | |
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39 | typedef struct TunnelType { |
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40 | const char *name; |
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41 | int (*open)(struct Tunnel *tunnel); |
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42 | int (*send)(struct Tunnel *tunnel, struct sk_buff *skb); |
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43 | void (*close)(struct Tunnel *tunnel); |
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44 | } TunnelType; |
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45 | |
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46 | typedef struct TunnelStats { |
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47 | int bytes; |
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48 | int packets; |
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49 | int dropped_bytes; |
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50 | int dropped_packets; |
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51 | } TunnelStats; |
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52 | |
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53 | typedef struct TunnelKey { |
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54 | struct VnetId vnet; |
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55 | struct VarpAddr addr; |
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56 | } TunnelKey; |
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57 | |
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58 | typedef struct Tunnel { |
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59 | /** Key identifying the tunnel. Must be first. */ |
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60 | struct TunnelKey key; |
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61 | /** Reference count. */ |
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62 | atomic_t refcount; |
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63 | /** Tunnel type. */ |
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64 | struct TunnelType *type; |
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65 | /** Statistics. */ |
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66 | struct TunnelStats send_stats; |
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67 | /** Type-dependent state. */ |
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68 | void *data; |
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69 | /** Underlying tunnel (may be null). */ |
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70 | struct Tunnel *base; |
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71 | } Tunnel; |
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72 | |
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73 | extern void Tunnel_free(struct Tunnel *tunnel); |
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74 | |
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75 | /** Decrement the reference count, freeing if zero. |
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76 | * |
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77 | * @param tunnel tunnel (may be null) |
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78 | */ |
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79 | static inline void Tunnel_decref(struct Tunnel *tunnel){ |
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80 | if(!tunnel) return; |
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81 | if(atomic_dec_and_test(&tunnel->refcount)){ |
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82 | Tunnel_free(tunnel); |
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83 | } |
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84 | } |
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85 | |
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86 | /** Increment the reference count. |
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87 | * |
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88 | * @param tunnel tunnel (may be null) |
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89 | */ |
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90 | static inline void Tunnel_incref(struct Tunnel *tunnel){ |
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91 | if(!tunnel) return; |
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92 | atomic_inc(&tunnel->refcount); |
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93 | } |
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94 | |
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95 | extern int Tunnel_init(void); |
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96 | extern int Tunnel_lookup(struct VnetId *vnet, struct VarpAddr *addr, struct Tunnel **tunnel); |
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97 | extern int Tunnel_open(struct VnetId *vnet, struct VarpAddr *addr, |
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98 | int (*ctor)(struct VnetId *vnet, |
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99 | struct VarpAddr *addr, |
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100 | struct Tunnel **ptunnel), |
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101 | struct Tunnel **ptunnel); |
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102 | extern int Tunnel_add(struct Tunnel *tunnel); |
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103 | extern int Tunnel_del(struct Tunnel *tunnel); |
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104 | extern void Tunnel_print(struct Tunnel *tunnel); |
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105 | extern int Tunnel_send(struct Tunnel *tunnel, struct sk_buff *skb); |
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106 | |
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107 | extern int Tunnel_create(struct TunnelType *type, struct VnetId *vnet, struct VarpAddr *addr, |
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108 | struct Tunnel *base, struct Tunnel **tunnelp); |
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109 | |
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110 | extern int tunnel_module_init(void); |
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111 | extern void tunnel_module_exit(void); |
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112 | |
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113 | #endif /* !__VNET_TUNNEL_H__ */ |
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