1 | /* |
1 | /* |
2 | device.h -- generic header for device.c |
2 | device.h -- generic header for device.c |
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3 | Copyright (C) 2003 Marc Lehmann <pcg@goof.com> |
3 | |
4 | |
4 | This program is free software; you can redistribute it and/or modify |
5 | This program is free software; you can redistribute it and/or modify |
5 | it under the terms of the GNU General Public License as published by |
6 | it under the terms of the GNU General Public License as published by |
6 | the Free Software Foundation; either version 2 of the License, or |
7 | the Free Software Foundation; either version 2 of the License, or |
7 | (at your option) any later version. |
8 | (at your option) any later version. |
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22 | #define IFNAMESIZE 256 // be conservative |
23 | #define IFNAMESIZE 256 // be conservative |
23 | |
24 | |
24 | #include "gettext.h" |
25 | #include "gettext.h" |
25 | |
26 | |
26 | #include "global.h" |
27 | #include "global.h" |
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28 | #include "util.h" |
27 | |
29 | |
28 | struct net_packet { |
30 | struct net_packet { |
29 | u32 len; // actually u16, but padding... |
31 | u32 len; // actually u16, but padding... |
30 | |
32 | |
31 | u8 &operator[] (u16 offset) const; |
33 | u8 &operator[] (u16 offset) const; |
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46 | { |
48 | { |
47 | len = pkt.len; |
49 | len = pkt.len; |
48 | memcpy (&((*this)[0]), &(pkt[0]), len); |
50 | memcpy (&((*this)[0]), &(pkt[0]), len); |
49 | } |
51 | } |
50 | |
52 | |
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53 | bool is_ipv4 () const |
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54 | { |
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55 | return (*this)[12] == 0x08 && (*this)[13] == 0x00 // IP |
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56 | && ((*this)[14] & 0xf0) == 0x40; // IPv4 |
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57 | } |
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58 | |
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59 | u32 &ipv4_src () const |
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60 | { |
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61 | return *(u32 *)&(*this)[26]; |
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62 | } |
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63 | |
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64 | u32 &ipv4_dst () const |
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65 | { |
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66 | return *(u32 *)&(*this)[30]; |
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67 | } |
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68 | |
51 | bool is_arp () |
69 | bool is_arp () const |
52 | { |
70 | { |
53 | return (*this)[12] == 0x08 && (*this)[13] == 0x06 // 0806 protocol |
71 | return (*this)[12] == 0x08 && (*this)[13] == 0x06 // 0806 protocol |
54 | && (*this)[14] == 0x00 && (*this)[15] == 0x01 // 0001 hw_format |
72 | && (*this)[14] == 0x00 && (*this)[15] == 0x01 // 0001 hw_format |
55 | && (*this)[16] == 0x08 && (*this)[17] == 0x00 // 0800 prot_format |
73 | && (*this)[16] == 0x08 && (*this)[17] == 0x00 // 0800 prot_format |
56 | && (*this)[18] == 0x06 && (*this)[19] == 0x04; // 06 hw_len 04 prot_len |
74 | && (*this)[18] == 0x06 && (*this)[19] == 0x04; // 06 hw_len 04 prot_len |
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68 | u8 &net_packet::operator[] (u16 offset) const |
86 | u8 &net_packet::operator[] (u16 offset) const |
69 | { |
87 | { |
70 | return ((data_packet *)this)->data_[offset]; |
88 | return ((data_packet *)this)->data_[offset]; |
71 | } |
89 | } |
72 | |
90 | |
73 | typedef u8 mac[6]; |
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74 | |
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75 | struct tap_packet : net_packet { |
91 | struct tap_packet : net_packet { |
76 | mac dst; |
92 | mac dst; |
77 | mac src; |
93 | mac src; |
78 | u8 data[MAXSIZE - 12]; |
94 | u8 data[MAXSIZE - 12]; |
79 | }; |
95 | }; |
80 | |
96 | |
81 | struct tap_device_base { |
97 | struct tap_device { |
82 | int fd; |
98 | int fd; |
83 | |
99 | |
84 | // network interface name or identifier |
100 | // network interface name or identifier |
85 | char ifrname[IFNAMESIZE + 1]; |
101 | char ifrname[IFNAMESIZE + 1]; |
86 | |
102 | |
87 | char *device; |
103 | tap_device (); |
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104 | ~tap_device (); |
88 | |
105 | |
89 | bool open (); |
106 | //bool open (); |
90 | void close (); |
107 | //void close (); |
91 | |
108 | |
92 | const char *interface () { return ifrname; } |
109 | const char *interface () { return ifrname; } |
93 | const char *info (); |
110 | const char *info (); |
94 | |
111 | |
95 | tap_packet *recv (); |
112 | tap_packet *recv (); |
96 | void send (tap_packet *pkt); |
113 | void send (tap_packet *pkt); |
97 | }; |
114 | }; |
98 | |
115 | |
99 | struct tap_device; |
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100 | |
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101 | extern tap_device tap; |
116 | //extern tap_device *tap_device (); |
102 | |
117 | |
103 | #endif |
118 | #endif |
104 | |
119 | |