1 | /* |
1 | /* |
2 | device-linux.C -- Interaction with Linux tun/tap device |
2 | device-linux.C -- Interaction with Linux tun/tap device |
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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. |
… | |
… | |
28 | #include <fcntl.h> |
29 | #include <fcntl.h> |
29 | #include <net/if.h> |
30 | #include <net/if.h> |
30 | #include <unistd.h> |
31 | #include <unistd.h> |
31 | #include <sys/ioctl.h> |
32 | #include <sys/ioctl.h> |
32 | |
33 | |
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34 | #include <net/if.h> |
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35 | |
33 | #ifdef LINUX_IF_TUN_H |
36 | #ifdef LINUX_IF_TUN_H |
34 | #include LINUX_IF_TUN_H |
37 | # include LINUX_IF_TUN_H |
35 | #else |
38 | #else |
36 | #include <linux/if_tun.h> |
39 | #include <linux/if_tun.h> |
37 | #endif |
40 | #endif |
38 | #define DEFAULT_DEVICE "/dev/net/tun" |
41 | #define DEFAULT_DEVICE "/dev/net/tun" |
39 | |
42 | |
40 | #include "gettext.h" |
43 | #include "gettext.h" |
41 | |
44 | |
42 | #include "conf.h" |
45 | #include "conf.h" |
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46 | |
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47 | #if TEST_ETHEREMU |
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48 | # define IF_istun |
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49 | # include "ether_emu.C" |
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50 | #endif |
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51 | |
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52 | const char * |
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53 | tap_device::info () |
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54 | { |
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55 | return _("Linux tun/tap device"); |
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56 | } |
43 | |
57 | |
44 | tap_device::tap_device () |
58 | tap_device::tap_device () |
45 | { |
59 | { |
46 | struct ifreq ifr; |
60 | struct ifreq ifr; |
47 | |
61 | |
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54 | slog (L_ERR, _("could not open device %s: %s"), device, strerror (errno)); |
68 | slog (L_ERR, _("could not open device %s: %s"), device, strerror (errno)); |
55 | exit (1); |
69 | exit (1); |
56 | } |
70 | } |
57 | |
71 | |
58 | memset (&ifr, 0, sizeof (ifr)); |
72 | memset (&ifr, 0, sizeof (ifr)); |
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73 | #if TEST_ETHEREMU |
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74 | ifr.ifr_flags = IFF_TUN | IFF_NO_PI; |
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75 | #else |
59 | ifr.ifr_flags = IFF_TAP | IFF_NO_PI; |
76 | ifr.ifr_flags = IFF_TAP | IFF_NO_PI; |
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77 | #endif |
60 | |
78 | |
61 | if (conf.ifname) |
79 | if (conf.ifname) |
62 | strncpy (ifr.ifr_name, conf.ifname, IFNAMSIZ); |
80 | strncpy (ifr.ifr_name, conf.ifname, IFNAMSIZ); |
63 | else |
81 | else |
64 | ifr.ifr_name[0] = 0; |
82 | ifr.ifr_name[0] = 0; |
… | |
… | |
88 | tap_packet * |
106 | tap_packet * |
89 | tap_device::recv () |
107 | tap_device::recv () |
90 | { |
108 | { |
91 | tap_packet *pkt = new tap_packet; |
109 | tap_packet *pkt = new tap_packet; |
92 | |
110 | |
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111 | #if TEST_ETHEREMU |
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112 | pkt->len = read (fd, &((*pkt)[14]), MAX_MTU - 14); |
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113 | #else |
93 | pkt->len = read (fd, &((*pkt)[0]), MAX_MTU); |
114 | pkt->len = read (fd, &((*pkt)[0]), MAX_MTU); |
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115 | #endif |
94 | |
116 | |
95 | if (pkt->len <= 0) |
117 | if (pkt->len <= 0) |
96 | { |
118 | { |
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119 | delete pkt; |
97 | slog (L_ERR, _("error while reading from %s %s: %s"), |
120 | slog (L_ERR, _("error while reading from %s %s: %s"), |
98 | info (), DEFAULT_DEVICE, strerror (errno)); |
121 | info (), DEFAULT_DEVICE, strerror (errno)); |
99 | free (pkt); |
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100 | return 0; |
122 | return 0; |
101 | } |
123 | } |
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124 | |
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125 | #if TEST_ETHEREMU |
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126 | pkt->len += 14; |
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127 | |
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128 | // assume ipv4 |
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129 | (*pkt)[12] = 0x08; |
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130 | (*pkt)[13] = 0x00; |
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131 | |
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132 | if (!ether_emu.tun_to_tap (pkt)) |
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133 | { |
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134 | delete pkt; |
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135 | return 0; |
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136 | } |
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137 | #endif |
102 | |
138 | |
103 | return pkt; |
139 | return pkt; |
104 | } |
140 | } |
105 | |
141 | |
106 | void |
142 | void |
107 | tap_device::send (tap_packet *pkt) |
143 | tap_device::send (tap_packet *pkt) |
108 | { |
144 | { |
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145 | #if TEST_ETHEREMU |
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146 | if (ether_emu.tap_to_tun (pkt) && |
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147 | write (fd, &((*pkt)[14]), pkt->len - 14) < 0) |
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148 | #else |
109 | if (write (fd, &((*pkt)[0]), pkt->len) < 0) |
149 | if (write (fd, &((*pkt)[0]), pkt->len) < 0) |
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150 | #endif |
110 | slog (L_ERR, _("can't write to %s %s: %s"), info (), DEFAULT_DEVICE, |
151 | slog (L_ERR, _("can't write to %s %s: %s"), info (), DEFAULT_DEVICE, |
111 | strerror (errno)); |
152 | strerror (errno)); |
112 | } |
153 | } |
113 | |
154 | |