1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Small implementation of brctl for busybox.
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4 | *
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5 | * Copyright (C) 2008 by Bernhard Reutner-Fischer
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6 | *
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7 | * Some helper functions from bridge-utils are
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8 | * Copyright (C) 2000 Lennert Buytenhek
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9 | *
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10 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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11 | */
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12 | /* This applet currently uses only the ioctl interface and no sysfs at all.
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13 | * At the time of this writing this was considered a feature.
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14 | */
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15 |
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16 | //usage:#define brctl_trivial_usage
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17 | //usage: "COMMAND [BRIDGE [INTERFACE]]"
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18 | //usage:#define brctl_full_usage "\n\n"
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19 | //usage: "Manage ethernet bridges\n"
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20 | //usage: "\nCommands:"
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21 | //usage: IF_FEATURE_BRCTL_SHOW(
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22 | //usage: "\n show Show a list of bridges"
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23 | //usage: )
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24 | //usage: "\n addbr BRIDGE Create BRIDGE"
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25 | //usage: "\n delbr BRIDGE Delete BRIDGE"
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26 | //usage: "\n addif BRIDGE IFACE Add IFACE to BRIDGE"
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27 | //usage: "\n delif BRIDGE IFACE Delete IFACE from BRIDGE"
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28 | //usage: IF_FEATURE_BRCTL_FANCY(
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29 | //usage: "\n setageing BRIDGE TIME Set ageing time"
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30 | //usage: "\n setfd BRIDGE TIME Set bridge forward delay"
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31 | //usage: "\n sethello BRIDGE TIME Set hello time"
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32 | //usage: "\n setmaxage BRIDGE TIME Set max message age"
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33 | //usage: "\n setpathcost BRIDGE COST Set path cost"
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34 | //usage: "\n setportprio BRIDGE PRIO Set port priority"
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35 | //usage: "\n setbridgeprio BRIDGE PRIO Set bridge priority"
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36 | //usage: "\n stp BRIDGE [1/yes/on|0/no/off] STP on/off"
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37 | //usage: )
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38 |
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39 | #include "libbb.h"
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40 | #include <linux/sockios.h>
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41 | #include <net/if.h>
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42 |
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43 | #ifndef SIOCBRADDBR
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44 | # define SIOCBRADDBR BRCTL_ADD_BRIDGE
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45 | #endif
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46 | #ifndef SIOCBRDELBR
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47 | # define SIOCBRDELBR BRCTL_DEL_BRIDGE
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48 | #endif
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49 | #ifndef SIOCBRADDIF
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50 | # define SIOCBRADDIF BRCTL_ADD_IF
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51 | #endif
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52 | #ifndef SIOCBRDELIF
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53 | # define SIOCBRDELIF BRCTL_DEL_IF
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54 | #endif
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55 |
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56 |
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57 | /* Maximum number of ports supported per bridge interface. */
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58 | #ifndef MAX_PORTS
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59 | # define MAX_PORTS 32
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60 | #endif
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61 |
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62 | /* Use internal number parsing and not the "exact" conversion. */
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63 | /* #define BRCTL_USE_INTERNAL 0 */ /* use exact conversion */
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64 | #define BRCTL_USE_INTERNAL 1
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65 |
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66 | #if ENABLE_FEATURE_BRCTL_FANCY
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67 | /* #include <linux/if_bridge.h>
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68 | * breaks on musl: we already included netinet/in.h in libbb.h,
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69 | * if we include <linux/if_bridge.h> here, we get this:
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70 | * In file included from /usr/include/linux/if_bridge.h:18,
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71 | * from networking/brctl.c:67:
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72 | * /usr/include/linux/in6.h:32: error: redefinition of 'struct in6_addr'
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73 | * /usr/include/linux/in6.h:49: error: redefinition of 'struct sockaddr_in6'
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74 | * /usr/include/linux/in6.h:59: error: redefinition of 'struct ipv6_mreq'
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75 | */
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76 | /* From <linux/if_bridge.h> */
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77 | #define BRCTL_GET_VERSION 0
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78 | #define BRCTL_GET_BRIDGES 1
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79 | #define BRCTL_ADD_BRIDGE 2
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80 | #define BRCTL_DEL_BRIDGE 3
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81 | #define BRCTL_ADD_IF 4
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82 | #define BRCTL_DEL_IF 5
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83 | #define BRCTL_GET_BRIDGE_INFO 6
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84 | #define BRCTL_GET_PORT_LIST 7
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85 | #define BRCTL_SET_BRIDGE_FORWARD_DELAY 8
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86 | #define BRCTL_SET_BRIDGE_HELLO_TIME 9
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87 | #define BRCTL_SET_BRIDGE_MAX_AGE 10
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88 | #define BRCTL_SET_AGEING_TIME 11
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89 | #define BRCTL_SET_GC_INTERVAL 12
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90 | #define BRCTL_GET_PORT_INFO 13
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91 | #define BRCTL_SET_BRIDGE_STP_STATE 14
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92 | #define BRCTL_SET_BRIDGE_PRIORITY 15
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93 | #define BRCTL_SET_PORT_PRIORITY 16
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94 | #define BRCTL_SET_PATH_COST 17
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95 | #define BRCTL_GET_FDB_ENTRIES 18
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96 | struct __bridge_info {
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97 | uint64_t designated_root;
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98 | uint64_t bridge_id;
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99 | uint32_t root_path_cost;
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100 | uint32_t max_age;
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101 | uint32_t hello_time;
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102 | uint32_t forward_delay;
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103 | uint32_t bridge_max_age;
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104 | uint32_t bridge_hello_time;
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105 | uint32_t bridge_forward_delay;
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106 | uint8_t topology_change;
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107 | uint8_t topology_change_detected;
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108 | uint8_t root_port;
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109 | uint8_t stp_enabled;
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110 | uint32_t ageing_time;
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111 | uint32_t gc_interval;
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112 | uint32_t hello_timer_value;
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113 | uint32_t tcn_timer_value;
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114 | uint32_t topology_change_timer_value;
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115 | uint32_t gc_timer_value;
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116 | };
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117 | /* end <linux/if_bridge.h> */
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118 |
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119 | /* FIXME: These 4 funcs are not really clean and could be improved */
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120 | static ALWAYS_INLINE void bb_strtotimeval(struct timeval *tv,
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121 | const char *time_str)
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122 | {
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123 | double secs;
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124 | # if BRCTL_USE_INTERNAL
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125 | char *endptr;
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126 | secs = /*bb_*/strtod(time_str, &endptr);
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127 | if (endptr == time_str)
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128 | # else
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129 | if (sscanf(time_str, "%lf", &secs) != 1)
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130 | # endif
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131 | bb_error_msg_and_die(bb_msg_invalid_arg_to, time_str, "timespec");
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132 | tv->tv_sec = secs;
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133 | tv->tv_usec = 1000000 * (secs - tv->tv_sec);
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134 | }
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135 |
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136 | static ALWAYS_INLINE unsigned long tv_to_jiffies(const struct timeval *tv)
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137 | {
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138 | unsigned long long jif;
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139 |
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140 | jif = 1000000ULL * tv->tv_sec + tv->tv_usec;
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141 |
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142 | return jif/10000;
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143 | }
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144 | # if 0
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145 | static void jiffies_to_tv(struct timeval *tv, unsigned long jiffies)
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146 | {
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147 | unsigned long long tvusec;
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148 |
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149 | tvusec = 10000ULL*jiffies;
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150 | tv->tv_sec = tvusec/1000000;
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151 | tv->tv_usec = tvusec - 1000000 * tv->tv_sec;
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152 | }
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153 | # endif
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154 | static unsigned long str_to_jiffies(const char *time_str)
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155 | {
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156 | struct timeval tv;
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157 | bb_strtotimeval(&tv, time_str);
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158 | return tv_to_jiffies(&tv);
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159 | }
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160 |
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161 | static void arm_ioctl(unsigned long *args,
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162 | unsigned long arg0, unsigned long arg1, unsigned long arg2)
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163 | {
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164 | args[0] = arg0;
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165 | args[1] = arg1;
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166 | args[2] = arg2;
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167 | args[3] = 0;
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168 | }
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169 | #endif
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170 |
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171 |
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172 | int brctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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173 | int brctl_main(int argc UNUSED_PARAM, char **argv)
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174 | {
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175 | static const char keywords[] ALIGN1 =
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176 | "addbr\0" "delbr\0" "addif\0" "delif\0"
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177 | IF_FEATURE_BRCTL_FANCY(
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178 | "stp\0"
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179 | "setageing\0" "setfd\0" "sethello\0" "setmaxage\0"
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180 | "setpathcost\0" "setportprio\0" "setbridgeprio\0"
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181 | )
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182 | IF_FEATURE_BRCTL_SHOW("show\0");
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183 |
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184 | enum { ARG_addbr = 0, ARG_delbr, ARG_addif, ARG_delif
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185 | IF_FEATURE_BRCTL_FANCY(,
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186 | ARG_stp,
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187 | ARG_setageing, ARG_setfd, ARG_sethello, ARG_setmaxage,
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188 | ARG_setpathcost, ARG_setportprio, ARG_setbridgeprio
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189 | )
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190 | IF_FEATURE_BRCTL_SHOW(, ARG_show)
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191 | };
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192 |
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193 | int fd;
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194 | smallint key;
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195 | struct ifreq ifr;
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196 | char *br, *brif;
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197 |
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198 | argv++;
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199 | while (*argv) {
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200 | #if ENABLE_FEATURE_BRCTL_FANCY
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201 | int ifidx[MAX_PORTS];
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202 | unsigned long args[4];
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203 | ifr.ifr_data = (char *) &args;
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204 | #endif
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205 |
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206 | key = index_in_strings(keywords, *argv);
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207 | if (key == -1) /* no match found in keywords array, bail out. */
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208 | bb_error_msg_and_die(bb_msg_invalid_arg_to, *argv, applet_name);
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209 | argv++;
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210 | fd = xsocket(AF_INET, SOCK_STREAM, 0);
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211 |
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212 | #if ENABLE_FEATURE_BRCTL_SHOW
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213 | if (key == ARG_show) { /* show */
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214 | char brname[IFNAMSIZ];
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215 | int bridx[MAX_PORTS];
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216 | int i, num;
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217 | arm_ioctl(args, BRCTL_GET_BRIDGES,
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218 | (unsigned long) bridx, MAX_PORTS);
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219 | num = xioctl(fd, SIOCGIFBR, args);
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220 | puts("bridge name\tbridge id\t\tSTP enabled\tinterfaces");
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221 | for (i = 0; i < num; i++) {
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222 | char ifname[IFNAMSIZ];
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223 | int j, tabs;
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224 | struct __bridge_info bi;
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225 | unsigned char *x;
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226 |
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227 | if (!if_indextoname(bridx[i], brname))
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228 | bb_perror_msg_and_die("can't get bridge name for index %d", i);
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229 | strncpy_IFNAMSIZ(ifr.ifr_name, brname);
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230 |
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231 | arm_ioctl(args, BRCTL_GET_BRIDGE_INFO,
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232 | (unsigned long) &bi, 0);
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233 | xioctl(fd, SIOCDEVPRIVATE, &ifr);
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234 | printf("%s\t\t", brname);
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235 |
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236 | /* print bridge id */
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237 | x = (unsigned char *) &bi.bridge_id;
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238 | for (j = 0; j < 8; j++) {
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239 | printf("%02x", x[j]);
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240 | if (j == 1)
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241 | bb_putchar('.');
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242 | }
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243 | printf(bi.stp_enabled ? "\tyes" : "\tno");
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244 |
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245 | /* print interface list */
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246 | arm_ioctl(args, BRCTL_GET_PORT_LIST,
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247 | (unsigned long) ifidx, MAX_PORTS);
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248 | xioctl(fd, SIOCDEVPRIVATE, &ifr);
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249 | tabs = 0;
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250 | for (j = 0; j < MAX_PORTS; j++) {
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251 | if (!ifidx[j])
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252 | continue;
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253 | if (!if_indextoname(ifidx[j], ifname))
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254 | bb_perror_msg_and_die("can't get interface name for index %d", j);
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255 | if (tabs)
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256 | printf("\t\t\t\t\t");
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257 | else
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258 | tabs = 1;
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259 | printf("\t\t%s\n", ifname);
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260 | }
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261 | if (!tabs) /* bridge has no interfaces */
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262 | bb_putchar('\n');
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263 | }
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264 | goto done;
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265 | }
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266 | #endif
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267 |
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268 | if (!*argv) /* all but 'show' need at least one argument */
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269 | bb_show_usage();
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270 |
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271 | br = *argv++;
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272 |
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273 | if (key == ARG_addbr || key == ARG_delbr) { /* addbr or delbr */
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274 | ioctl_or_perror_and_die(fd,
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275 | key == ARG_addbr ? SIOCBRADDBR : SIOCBRDELBR,
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276 | br, "bridge %s", br);
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277 | goto done;
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278 | }
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279 |
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280 | if (!*argv) /* all but 'addbr/delbr' need at least two arguments */
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281 | bb_show_usage();
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282 |
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283 | strncpy_IFNAMSIZ(ifr.ifr_name, br);
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284 | if (key == ARG_addif || key == ARG_delif) { /* addif or delif */
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285 | brif = *argv;
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286 | ifr.ifr_ifindex = if_nametoindex(brif);
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287 | if (!ifr.ifr_ifindex) {
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288 | bb_perror_msg_and_die("iface %s", brif);
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289 | }
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290 | ioctl_or_perror_and_die(fd,
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291 | key == ARG_addif ? SIOCBRADDIF : SIOCBRDELIF,
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292 | &ifr, "bridge %s", br);
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293 | goto done_next_argv;
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294 | }
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295 | #if ENABLE_FEATURE_BRCTL_FANCY
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296 | if (key == ARG_stp) { /* stp */
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297 | static const char no_yes[] ALIGN1 =
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298 | "0\0" "off\0" "n\0" "no\0" /* 0 .. 3 */
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299 | "1\0" "on\0" "y\0" "yes\0"; /* 4 .. 7 */
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300 | int onoff = index_in_strings(no_yes, *argv);
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301 | if (onoff < 0)
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302 | bb_error_msg_and_die(bb_msg_invalid_arg_to, *argv, applet_name);
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303 | onoff = (unsigned)onoff / 4;
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304 | arm_ioctl(args, BRCTL_SET_BRIDGE_STP_STATE, onoff, 0);
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305 | goto fire;
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306 | }
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307 | if ((unsigned)(key - ARG_setageing) < 4) { /* time related ops */
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308 | static const uint8_t ops[] ALIGN1 = {
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309 | BRCTL_SET_AGEING_TIME, /* ARG_setageing */
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310 | BRCTL_SET_BRIDGE_FORWARD_DELAY, /* ARG_setfd */
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311 | BRCTL_SET_BRIDGE_HELLO_TIME, /* ARG_sethello */
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312 | BRCTL_SET_BRIDGE_MAX_AGE /* ARG_setmaxage */
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313 | };
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314 | arm_ioctl(args, ops[key - ARG_setageing], str_to_jiffies(*argv), 0);
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315 | goto fire;
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316 | }
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317 | if (key == ARG_setpathcost
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318 | || key == ARG_setportprio
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319 | || key == ARG_setbridgeprio
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320 | ) {
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321 | static const uint8_t ops[] ALIGN1 = {
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322 | BRCTL_SET_PATH_COST, /* ARG_setpathcost */
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323 | BRCTL_SET_PORT_PRIORITY, /* ARG_setportprio */
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324 | BRCTL_SET_BRIDGE_PRIORITY /* ARG_setbridgeprio */
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325 | };
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326 | int port = -1;
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327 | unsigned arg1, arg2;
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328 |
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329 | if (key != ARG_setbridgeprio) {
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330 | /* get portnum */
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331 | unsigned i;
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332 |
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333 | port = if_nametoindex(*argv++);
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334 | if (!port)
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335 | bb_error_msg_and_die(bb_msg_invalid_arg_to, *argv, "port");
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336 | memset(ifidx, 0, sizeof ifidx);
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337 | arm_ioctl(args, BRCTL_GET_PORT_LIST, (unsigned long)ifidx,
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338 | MAX_PORTS);
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339 | xioctl(fd, SIOCDEVPRIVATE, &ifr);
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340 | for (i = 0; i < MAX_PORTS; i++) {
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341 | if (ifidx[i] == port) {
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342 | port = i;
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343 | break;
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344 | }
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345 | }
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346 | }
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347 | arg1 = port;
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348 | arg2 = xatoi_positive(*argv);
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349 | if (key == ARG_setbridgeprio) {
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350 | arg1 = arg2;
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351 | arg2 = 0;
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352 | }
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353 | arm_ioctl(args, ops[key - ARG_setpathcost], arg1, arg2);
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354 | }
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355 | fire:
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356 | /* Execute the previously set command */
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357 | xioctl(fd, SIOCDEVPRIVATE, &ifr);
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358 | #endif
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359 | done_next_argv:
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360 | argv++;
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361 | done:
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362 | close(fd);
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363 | }
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364 |
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365 | return EXIT_SUCCESS;
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366 | }
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