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