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) 2003-2004 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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34 | u8 *at (u16 offset) const; |
32 | |
35 | |
33 | void unshift_hdr (u16 hdrsize) |
36 | void unshift_hdr (u16 hdrsize) |
34 | { |
37 | { |
35 | memmove ((void *)&(*this)[hdrsize], (void *)&(*this)[0], len); |
38 | memmove ((void *)&(*this)[hdrsize], (void *)&(*this)[0], len); |
36 | len += hdrsize; |
39 | len += hdrsize; |
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46 | { |
49 | { |
47 | len = pkt.len; |
50 | len = pkt.len; |
48 | memcpy (&((*this)[0]), &(pkt[0]), len); |
51 | memcpy (&((*this)[0]), &(pkt[0]), len); |
49 | } |
52 | } |
50 | |
53 | |
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54 | bool is_ipv4 () const |
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55 | { |
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56 | return (*this)[12] == 0x08 && (*this)[13] == 0x00 // IP |
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57 | && ((*this)[14] & 0xf0) == 0x40; // IPv4 |
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58 | } |
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59 | |
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60 | u32 &ipv4_src () const |
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61 | { |
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62 | return *(u32 *)&(*this)[26]; |
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63 | } |
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64 | |
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65 | u32 &ipv4_dst () const |
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66 | { |
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67 | return *(u32 *)&(*this)[30]; |
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68 | } |
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69 | |
51 | bool is_arp () |
70 | bool is_arp () const |
52 | { |
71 | { |
53 | return (*this)[12] == 0x08 && (*this)[13] == 0x06 // 0806 protocol |
72 | return (*this)[12] == 0x08 && (*this)[13] == 0x06 // 0806 protocol |
54 | && (*this)[14] == 0x00 && (*this)[15] == 0x01 // 0001 hw_format |
73 | && (*this)[14] == 0x00 && (*this)[15] == 0x01 // 0001 hw_format |
55 | && (*this)[16] == 0x08 && (*this)[17] == 0x00 // 0800 prot_format |
74 | && (*this)[16] == 0x08 && (*this)[17] == 0x00 // 0800 prot_format |
56 | && (*this)[18] == 0x06 && (*this)[19] == 0x04; // 06 hw_len 04 prot_len |
75 | && (*this)[18] == 0x06 && (*this)[19] == 0x04; // 06 hw_len 04 prot_len |
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68 | u8 &net_packet::operator[] (u16 offset) const |
87 | u8 &net_packet::operator[] (u16 offset) const |
69 | { |
88 | { |
70 | return ((data_packet *)this)->data_[offset]; |
89 | return ((data_packet *)this)->data_[offset]; |
71 | } |
90 | } |
72 | |
91 | |
73 | typedef u8 mac[6]; |
92 | inline |
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93 | u8 *net_packet::at (u16 offset) const |
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94 | { |
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95 | return &((*this)[offset]); |
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96 | } |
74 | |
97 | |
75 | struct tap_packet : net_packet { |
98 | struct tap_packet : net_packet { |
76 | mac dst; |
99 | mac dst; |
77 | mac src; |
100 | mac src; |
78 | u8 data[MAXSIZE - 12]; |
101 | u8 data[MAXSIZE - 12]; |
79 | }; |
102 | }; |
80 | |
103 | |
81 | struct tap_device_base { |
104 | struct tap_device { |
82 | int fd; |
105 | int fd; |
83 | |
106 | |
84 | // network interface name or identifier |
107 | // network interface name or identifier |
85 | char ifrname[IFNAMESIZE + 1]; |
108 | char ifrname[IFNAMESIZE + 1]; |
86 | |
109 | |