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 |
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69 | /* FIXME: These 4 funcs are not really clean and could be improved */
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70 | static ALWAYS_INLINE void bb_strtotimeval(struct timeval *tv,
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71 | const char *time_str)
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72 | {
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73 | double secs;
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74 | # if BRCTL_USE_INTERNAL
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75 | char *endptr;
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76 | secs = /*bb_*/strtod(time_str, &endptr);
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77 | if (endptr == time_str)
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78 | # else
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79 | if (sscanf(time_str, "%lf", &secs) != 1)
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80 | # endif
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81 | bb_error_msg_and_die(bb_msg_invalid_arg, time_str, "timespec");
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82 | tv->tv_sec = secs;
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83 | tv->tv_usec = 1000000 * (secs - tv->tv_sec);
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84 | }
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85 |
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86 | static ALWAYS_INLINE unsigned long tv_to_jiffies(const struct timeval *tv)
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87 | {
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88 | unsigned long long jif;
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89 |
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90 | jif = 1000000ULL * tv->tv_sec + tv->tv_usec;
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91 |
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92 | return jif/10000;
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93 | }
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94 | # if 0
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95 | static void jiffies_to_tv(struct timeval *tv, unsigned long jiffies)
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96 | {
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97 | unsigned long long tvusec;
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98 |
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99 | tvusec = 10000ULL*jiffies;
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100 | tv->tv_sec = tvusec/1000000;
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101 | tv->tv_usec = tvusec - 1000000 * tv->tv_sec;
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102 | }
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103 | # endif
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104 | static unsigned long str_to_jiffies(const char *time_str)
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105 | {
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106 | struct timeval tv;
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107 | bb_strtotimeval(&tv, time_str);
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108 | return tv_to_jiffies(&tv);
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109 | }
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110 |
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111 | static void arm_ioctl(unsigned long *args,
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112 | unsigned long arg0, unsigned long arg1, unsigned long arg2)
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113 | {
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114 | args[0] = arg0;
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115 | args[1] = arg1;
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116 | args[2] = arg2;
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117 | args[3] = 0;
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118 | }
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119 | #endif
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120 |
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121 |
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122 | int brctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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123 | int brctl_main(int argc UNUSED_PARAM, char **argv)
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124 | {
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125 | static const char keywords[] ALIGN1 =
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126 | "addbr\0" "delbr\0" "addif\0" "delif\0"
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127 | IF_FEATURE_BRCTL_FANCY(
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128 | "stp\0"
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129 | "setageing\0" "setfd\0" "sethello\0" "setmaxage\0"
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130 | "setpathcost\0" "setportprio\0" "setbridgeprio\0"
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131 | )
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132 | IF_FEATURE_BRCTL_SHOW("show\0");
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133 |
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134 | enum { ARG_addbr = 0, ARG_delbr, ARG_addif, ARG_delif
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135 | IF_FEATURE_BRCTL_FANCY(,
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136 | ARG_stp,
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137 | ARG_setageing, ARG_setfd, ARG_sethello, ARG_setmaxage,
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138 | ARG_setpathcost, ARG_setportprio, ARG_setbridgeprio
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139 | )
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140 | IF_FEATURE_BRCTL_SHOW(, ARG_show)
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141 | };
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142 |
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143 | int fd;
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144 | smallint key;
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145 | struct ifreq ifr;
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146 | char *br, *brif;
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147 |
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148 | argv++;
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149 | while (*argv) {
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150 | #if ENABLE_FEATURE_BRCTL_FANCY
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151 | int ifidx[MAX_PORTS];
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152 | unsigned long args[4];
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153 | ifr.ifr_data = (char *) &args;
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154 | #endif
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155 |
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156 | key = index_in_strings(keywords, *argv);
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157 | if (key == -1) /* no match found in keywords array, bail out. */
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158 | bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
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159 | argv++;
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160 | fd = xsocket(AF_INET, SOCK_STREAM, 0);
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161 |
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162 | #if ENABLE_FEATURE_BRCTL_SHOW
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163 | if (key == ARG_show) { /* show */
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164 | char brname[IFNAMSIZ];
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165 | int bridx[MAX_PORTS];
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166 | int i, num;
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167 | arm_ioctl(args, BRCTL_GET_BRIDGES,
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168 | (unsigned long) bridx, MAX_PORTS);
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169 | num = xioctl(fd, SIOCGIFBR, args);
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170 | printf("bridge name\tbridge id\t\tSTP enabled\tinterfaces\n");
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171 | for (i = 0; i < num; i++) {
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172 | char ifname[IFNAMSIZ];
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173 | int j, tabs;
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174 | struct __bridge_info bi;
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175 | unsigned char *x;
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176 |
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177 | if (!if_indextoname(bridx[i], brname))
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178 | bb_perror_msg_and_die("can't get bridge name for index %d", i);
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179 | strncpy_IFNAMSIZ(ifr.ifr_name, brname);
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180 |
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181 | arm_ioctl(args, BRCTL_GET_BRIDGE_INFO,
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182 | (unsigned long) &bi, 0);
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183 | xioctl(fd, SIOCDEVPRIVATE, &ifr);
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184 | printf("%s\t\t", brname);
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185 |
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186 | /* print bridge id */
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187 | x = (unsigned char *) &bi.bridge_id;
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188 | for (j = 0; j < 8; j++) {
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189 | printf("%.2x", x[j]);
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190 | if (j == 1)
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191 | bb_putchar('.');
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192 | }
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193 | printf(bi.stp_enabled ? "\tyes" : "\tno");
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194 |
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195 | /* print interface list */
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196 | arm_ioctl(args, BRCTL_GET_PORT_LIST,
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197 | (unsigned long) ifidx, MAX_PORTS);
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198 | xioctl(fd, SIOCDEVPRIVATE, &ifr);
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199 | tabs = 0;
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200 | for (j = 0; j < MAX_PORTS; j++) {
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201 | if (!ifidx[j])
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202 | continue;
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203 | if (!if_indextoname(ifidx[j], ifname))
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204 | bb_perror_msg_and_die("can't get interface name for index %d", j);
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205 | if (tabs)
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206 | printf("\t\t\t\t\t");
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207 | else
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208 | tabs = 1;
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209 | printf("\t\t%s\n", ifname);
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210 | }
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211 | if (!tabs) /* bridge has no interfaces */
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212 | bb_putchar('\n');
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213 | }
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214 | goto done;
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215 | }
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216 | #endif
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217 |
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218 | if (!*argv) /* all but 'show' need at least one argument */
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219 | bb_show_usage();
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220 |
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221 | br = *argv++;
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222 |
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223 | if (key == ARG_addbr || key == ARG_delbr) { /* addbr or delbr */
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224 | ioctl_or_perror_and_die(fd,
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225 | key == ARG_addbr ? SIOCBRADDBR : SIOCBRDELBR,
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226 | br, "bridge %s", br);
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227 | goto done;
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228 | }
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229 |
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230 | if (!*argv) /* all but 'addbr/delbr' need at least two arguments */
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231 | bb_show_usage();
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232 |
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233 | strncpy_IFNAMSIZ(ifr.ifr_name, br);
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234 | if (key == ARG_addif || key == ARG_delif) { /* addif or delif */
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235 | brif = *argv;
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236 | ifr.ifr_ifindex = if_nametoindex(brif);
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237 | if (!ifr.ifr_ifindex) {
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238 | bb_perror_msg_and_die("iface %s", brif);
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239 | }
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240 | ioctl_or_perror_and_die(fd,
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241 | key == ARG_addif ? SIOCBRADDIF : SIOCBRDELIF,
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242 | &ifr, "bridge %s", br);
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243 | goto done_next_argv;
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244 | }
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245 | #if ENABLE_FEATURE_BRCTL_FANCY
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246 | if (key == ARG_stp) { /* stp */
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247 | static const char no_yes[] ALIGN1 =
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248 | "0\0" "off\0" "n\0" "no\0" /* 0 .. 3 */
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249 | "1\0" "on\0" "y\0" "yes\0"; /* 4 .. 7 */
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250 | int onoff = index_in_strings(no_yes, *argv);
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251 | if (onoff < 0)
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252 | bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
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253 | onoff = (unsigned)onoff / 4;
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254 | arm_ioctl(args, BRCTL_SET_BRIDGE_STP_STATE, onoff, 0);
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255 | goto fire;
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256 | }
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257 | if ((unsigned)(key - ARG_setageing) < 4) { /* time related ops */
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258 | static const uint8_t ops[] ALIGN1 = {
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259 | BRCTL_SET_AGEING_TIME, /* ARG_setageing */
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260 | BRCTL_SET_BRIDGE_FORWARD_DELAY, /* ARG_setfd */
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261 | BRCTL_SET_BRIDGE_HELLO_TIME, /* ARG_sethello */
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262 | BRCTL_SET_BRIDGE_MAX_AGE /* ARG_setmaxage */
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263 | };
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264 | arm_ioctl(args, ops[key - ARG_setageing], str_to_jiffies(*argv), 0);
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265 | goto fire;
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266 | }
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267 | if (key == ARG_setpathcost
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268 | || key == ARG_setportprio
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269 | || key == ARG_setbridgeprio
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270 | ) {
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271 | static const uint8_t ops[] ALIGN1 = {
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272 | BRCTL_SET_PATH_COST, /* ARG_setpathcost */
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273 | BRCTL_SET_PORT_PRIORITY, /* ARG_setportprio */
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274 | BRCTL_SET_BRIDGE_PRIORITY /* ARG_setbridgeprio */
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275 | };
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276 | int port = -1;
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277 | unsigned arg1, arg2;
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278 |
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279 | if (key != ARG_setbridgeprio) {
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280 | /* get portnum */
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281 | unsigned i;
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282 |
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283 | port = if_nametoindex(*argv++);
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284 | if (!port)
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285 | bb_error_msg_and_die(bb_msg_invalid_arg, *argv, "port");
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286 | memset(ifidx, 0, sizeof ifidx);
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287 | arm_ioctl(args, BRCTL_GET_PORT_LIST, (unsigned long)ifidx,
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288 | MAX_PORTS);
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289 | xioctl(fd, SIOCDEVPRIVATE, &ifr);
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290 | for (i = 0; i < MAX_PORTS; i++) {
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291 | if (ifidx[i] == port) {
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292 | port = i;
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293 | break;
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294 | }
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295 | }
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296 | }
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297 | arg1 = port;
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298 | arg2 = xatoi_positive(*argv);
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299 | if (key == ARG_setbridgeprio) {
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300 | arg1 = arg2;
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301 | arg2 = 0;
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302 | }
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303 | arm_ioctl(args, ops[key - ARG_setpathcost], arg1, arg2);
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304 | }
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305 | fire:
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306 | /* Execute the previously set command */
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307 | xioctl(fd, SIOCDEVPRIVATE, &ifr);
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308 | #endif
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309 | done_next_argv:
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310 | argv++;
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311 | done:
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312 | close(fd);
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313 | }
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314 |
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315 | return EXIT_SUCCESS;
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316 | }
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